Boiler safety detection system and control method thereof

Abstract

The invention discloses a boiler safety detection system and a control method of the boiler safety detection system. The boiler safety detection system comprises a coal conveying device; the coal mill is used for milling a coal raw material into coal powder; a coal feeder; a boiler; a burner; the coal component monitoring system is used for monitoring the components of the coal raw materials; the pulverized coal fineness monitoring system is used for monitoring the fineness of the pulverized coal; the combustor flame monitoring system is used for monitoring flame of the combustor; the coking visualization system is used for monitoring the coking state in the boiler; and the display is connected with the coal composition monitoring system, the pulverized coal fineness monitoring system, the burner flame monitoring system and the coking visualization system and is used for displaying monitoring results in real time. According to the boiler safety detection system, the coal composition, the pulverized coal fineness and the combustion condition in the boiler can be monitored in real time, so that the operation state of the boiler safety detection system can be known in real time, and the safety and reliability of the boiler can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of boilers, and in particular to a boiler safety detection system and a control method for the boiler safety detection system. Background Art

[0002] The characteristics of my country's energy structure determine that thermal power generation will still occupy a dominant position in my country's electricity production for a considerable period of time. Further improving the efficient and clean development of coal-fired power and creating an "upgraded version" of the coal-fired power industry is a strategic choice to promote my country's construction of an ecological civilization, resource-saving, and environmentally friendly society. It is also a practical need to promote my country's energy technology revolution, drive industrial upgrading, and achieve clean and efficient use of coal and innovative development. Therefore, deepening the energy-saving upgrade and environmental protection transformation of the coal-fired power industry is the only way to develop thermal power generation.

[0003] At present, due to economic benefit pressure and coal market shortage, power generation enterprises are generally forced to use economic coal and implement coal blending, which causes the boiler to operate in a state that deviates from the designed coal quality range and tends to be inferior. In the prior art, after the unit coal type is changed, the boiler has problems such as deflagration of the pulverizing system, burnout of the burner nozzle, and coking of the heating surface that affect the boiler safety, which leads to safety hazards and increases the probability of boiler non-stopping, thus affecting power generation efficiency and economic benefits. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention is to provide a boiler safety detection system, which can monitor the coal quality composition, coal powder fineness and combustion conditions in the boiler in real time, thereby helping to understand the operating status of the boiler safety detection system in real time, thereby effectively improving the safety and reliability of the boiler.

[0005] The invention also provides a control method for the boiler safety detection system.

[0006] According to the first aspect of the present invention, the boiler safety detection system comprises: a coal conveying device; a coal mill, the coal mill having a raw material inlet and a powder outlet, the coal conveying device being connected to the raw material inlet and used to convey the coal raw material to the coal mill, the coal mill being used to grind the coal raw material into coal powder; a coal feeder, the coal feeder being connected between the coal conveying device and the coal mill; a boiler, the powder outlet being connected to the boiler through a coal powder pipeline; a burner, the burner being arranged in the boiler; a coal quality component monitoring system, the coal quality component monitoring system being used to monitor the composition of the coal raw material; a coal powder fineness monitoring system system, the coal powder fineness detection system is used to monitor the fineness of the coal powder blown out of the powder outlet; a burner flame monitoring system is used to monitor the flame of the burner; a coking visualization system is used to monitor the coking state in the boiler; a display is connected to the coal quality composition monitoring system, the coal powder fineness monitoring system, the burner flame monitoring system and the coking visualization system, and is used to display the monitoring results of the coal quality composition monitoring system, the coal powder fineness monitoring system, the burner flame monitoring system and the coking visualization system in real time.

[0007] According to the boiler safety detection system of the present invention, a coal conveying device, a coal mill, a coal feeder, a boiler, a burner, a coal quality component monitoring system, a coal powder fineness monitoring system, a burner flame monitoring system, a coking visualization system and a display are arranged in the boiler safety detection system. The coal mill has a raw material inlet and a powder outlet. The coal conveying device is connected to the raw material inlet and is used to convey the coal raw material to the coal mill. The coal mill is used to grind the coal raw material into coal powder. The coal feeder is connected between the coal conveying device and the coal mill. The powder outlet is connected to the boiler through a coal powder pipeline. The burner is arranged in the boiler. The coal quality component monitoring system is used to monitor the composition of the coal raw material. The coal powder fineness The detection system is used to monitor the fineness of the coal powder blown out of the powder outlet and to monitor the flame of the burner. The coking visualization system is used to monitor the coking status in the boiler. The display is connected to the coal quality composition monitoring system, the coal powder fineness monitoring system, the burner flame monitoring system and the coking visualization system. It is used to display the monitoring results of the coal quality composition monitoring system, the coal powder fineness monitoring system, the burner flame monitoring system and the coking visualization system in real time. It can monitor the coal quality composition, coal powder fineness and combustion conditions in the boiler in real time, which helps to understand the operating status of the boiler safety detection system in real time, and can effectively improve the safety and reliability of the boiler.

[0008] In some embodiments, the boiler safety detection system also includes: a data processing module, which is connected to the coal quality composition monitoring system and the display, and the data processing module obtains the ignition temperature, explosion index and / or slagging index of the coal powder according to the composition of the coal raw material monitored by the coal quality composition monitoring system, and sends the ignition temperature, the explosion index and / or the slagging index to the display for display.

[0009] According to the control method of the boiler safety detection system according to the second aspect of the present invention, the boiler safety detection system is the boiler safety detection system according to the first aspect of the present invention, and the control method comprises: S1, acquiring the composition of the coal raw material; S2, determining the ignition temperature, explosion index and / or slagging index of the coal powder according to the composition of the coal raw material; S3, monitoring and adjusting the operating status parameters of the pulverizer, the operating status parameters of the burner and / or the operating status parameters of the boiler according to the ignition temperature, the explosion index and / or the slagging index.

[0010] According to the control method of the boiler safety detection system of the second aspect of the present invention, it is possible to monitor and adjust the operating status of the boiler safety detection system in real time according to the ignition temperature, explosion index and / or slagging index of the coal powder, so that the boiler safety detection system can operate safely and stably, thereby effectively improving the safety and stability of the boiler.

[0011] In some embodiments, the operating status parameters of the coal mill include: the inlet air temperature of the coal mill, the inlet air volume of the coal mill, the coal powder temperature at the powder outlet of the coal mill, the wind speed at the powder outlet of the coal mill, the CO concentration inside the coal mill, the coal powder fineness R90, the coal mill differential pressure, the coal mill current and / or the loading force of the coal mill; the operating status parameters of the burner include: the flame color, flame shape and / or slagging state of the burner nozzle; the operating status parameters of the boiler include: the temperature of the furnace heating surface, the slagging state of the furnace heating surface, the boiler operating steam temperature parameters, the boiler exhaust temperature, the flue gas temperature of each section of the furnace and / or the furnace negative pressure.

[0012] In some embodiments, in step S3, according to the explosion index, the operating status parameters of the coal mill, the operating status parameters of the burner and / or the operating status parameters of the boiler are monitored and adjusted, including: S31, according to the explosion index, obtaining the explosion index interval in which the explosion index is located; S32, controlling the display to issue a first alarm message corresponding to the explosion index interval; S33, according to the explosion index interval, monitoring and adjusting the inlet air temperature of the coal mill, the air-powder temperature at the powder outlet, the CO concentration inside the coal mill, the coal powder fineness R90, the coal mill differential pressure, the coal mill current and the coal mill loading force.

[0013] In some embodiments, step S33 includes: obtaining an explosion index-coal powder fineness calculation formula corresponding to the explosion index interval, calculating a first target coal powder fineness according to the explosion index-coal powder fineness calculation formula, and adjusting the coal powder fineness R90 to the first target coal powder fineness; and / or, obtaining an air-coal ratio interval of the coal mill corresponding to the explosion index interval, and adjusting the ventilation air volume of the coal mill according to the air-coal ratio interval so that the CO concentration in the coal mill is lower than a preset target concentration; and / or, when it is detected that the temperature of the powder outlet of the coal mill exceeds the upper temperature threshold, the heating rate exceeds the heating threshold, and the pressure exceeds the upper temperature threshold, the coal powder fineness is adjusted to the first target coal powder fineness; When the pressure exceeds the pressure threshold and / or the pressure increase rate exceeds the pressure increase threshold, inerting steam is introduced into the coal mill; and / or, when it is confirmed that the shutdown conditions for stopping the coal mill are met, the output of the coal feeder is gradually reduced, the differential pressure of the coal mill is gradually reduced, the hot primary air regulating door at the inlet of the coal mill is gradually closed, and the cold primary air regulating door at the inlet of the coal mill is fully opened to control the temperature of the powder outlet of the coal mill to be no greater than the preset temperature threshold corresponding to the explosion index interval; when the coal feeding is completely stopped, the coal mill maintains the ventilation volume for purging and continues the ventilation time corresponding to the explosion index interval, and after confirming that there is no accumulated powder in the coal mill and the coal powder pipeline, the coal mill is stopped.

[0014] In some embodiments, in step S3, the operating status parameters of the pulverizer, the operating status parameters of the burner and / or the operating status parameters of the boiler are monitored and adjusted according to the ignition temperature, including: S310, obtaining the ignition temperature range corresponding to the ignition temperature according to the ignition temperature; S320, controlling the display to issue a second alarm message corresponding to the ignition temperature range; S330, monitoring and adjusting the coal powder fineness R90 in the coal powder pipeline, the wind speed in the coal powder pipeline, the flame color of the burner nozzle, the flame shape and the furnace negative pressure according to the ignition temperature range.

[0015] In some embodiments, step S330 includes: obtaining an ignition temperature-coal powder fineness calculation formula corresponding to the ignition temperature range, calculating a second target coal powder fineness according to the ignition temperature-coal powder fineness calculation formula, and adjusting the coal powder fineness R90 to the second target coal powder fineness according to the second target coal powder fineness; and / or, obtaining a first target wind speed range of the powder outlet corresponding to the ignition temperature range, adjusting the wind speed of the powder outlet to the first target wind speed range; and / or, the burner is a front-to-back counter-swirl burner, and the central wind opening of the burner is adjusted according to the ignition temperature range. For the central wind opening interval corresponding to the ignition temperature interval, the swirl intensity of the outer secondary air is adjusted to a first swirl intensity interval corresponding to the ignition temperature interval, the swirl opening of the outer secondary air is adjusted to the corresponding swirl opening interval, and the swirl intensity of the inner secondary air is adjusted to a second swirl intensity interval corresponding to the ignition temperature interval; and / or, the burner is a direct current burner with a tangential circular combustion mode, and according to the ignition temperature interval, the peripheral wind opening of the burner is adjusted to the peripheral wind opening interval corresponding to the ignition temperature interval, and the opening of the secondary air door is adjusted to the secondary air door opening interval corresponding to the ignition temperature interval.

[0016] In some embodiments, in step S3, according to the slagging index, the operating status parameters of the coal mill, the operating status parameters of the burner and / or the operating status parameters of the boiler are monitored and adjusted, including: S3100, according to the slagging index, obtaining the slagging index interval corresponding to the slagging index; S3200, controlling the display to issue a third alarm message corresponding to the slagging index interval; S3300, according to the slagging index interval, monitoring and adjusting the slagging state of the burner nozzle and its vicinity, the slagging state of the furnace heating surface, the boiler operating steam temperature parameters, the furnace heating surface wall temperature, the boiler exhaust temperature, the flue gas temperature of each section of the furnace and the furnace negative pressure.

[0017] In some embodiments, step S330 includes: confirming the current operating load of the boiler, obtaining the corresponding oxygen content range of the boiler operating oxygen content according to the operating load and the slagging index range, and adjusting the operating oxygen content in the boiler to the oxygen content range; and / or, obtaining the slagging index-coal powder fineness calculation formula corresponding to the slagging index range, calculating the third target coal powder fineness according to the slagging index-coal powder fineness calculation formula, and adjusting the coal powder fineness R90 to the third target coal powder fineness; and / or, obtaining the second target wind speed range of the powder outlet corresponding to the slagging index range, adjusting the wind speed of the powder outlet to the second target wind speed range; and / or, obtaining the slagging index range corresponding to the slagging index range. The soot blowing frequency of the furnace and flue of the boiler corresponding to the index interval is controlled to control the boiler to soot blow according to the soot blowing frequency; and / or, the proportion interval of the blending ratio of the slagging coal in the coal raw material corresponding to the slagging index interval is obtained, the blending ratio of the slagging coal in the coal raw material is adjusted to the proportion interval, the combustion height position of the pulverized coal in the boiler corresponding to the slagging index interval is obtained, and the pulverized coal is controlled to burn at the combustion height position; and / or, the slagging state of the burner nozzle and its vicinity and the slagging state of the furnace heating surface are obtained, and when it is confirmed that the coking state of the burner nozzle and / or the coking state of the heating surface meet the decoking conditions, a decoking agent is added to the area meeting the decoking conditions.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of a boiler safety detection system according to an embodiment of the present invention;

[0020] Figure 2 is a flow chart of a control method of a boiler safety detection system according to an embodiment of the present invention;

[0021] Figure 3 It is a flow chart of a control method of a boiler safety detection system according to a specific embodiment of the present invention.

[0022] Reference numerals:

[0023] 100. Boiler safety detection system;

[0024] 1. Coal conveying device;

[0025] 2. Coal mill;

[0026] 3. Coal feeder;

[0027] 4. Boiler;

[0028] 5. Pulverized coal pipeline;

[0029] 6. Burner;

[0030] 7. Coal quality component monitoring system;

[0031] 8. Coal powder fineness monitoring system;

[0032] 9. Burner flame monitoring system;

[0033] 10. Coking visualization system;

[0034] 11. Display;

[0035] 12. Data signal transmission system. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0037] Reference below Figure 1 A boiler safety detection system 100 according to an embodiment of the first aspect of the present invention is described.

[0038] like Figure 1 As shown, a boiler safety detection system 100 according to an embodiment of the first aspect of the present invention includes: a coal conveying device 1, a coal mill 2, a coal feeder 3, a boiler 4, a burner 6, a coal quality composition monitoring system 7, a coal powder fineness monitoring system 8, a burner flame monitoring system 9, a coking visualization system 10 and a display 11.

[0039] The coal mill 2 has a raw material inlet and a powder outlet, the coal conveying device 1 is connected to the raw material inlet, and is used to convey the coal raw material to the coal mill 2, and the coal mill 2 is used to grind the coal raw material into coal powder; the coal feeder 3 is connected between the coal conveying device 1 and the coal mill 2; the powder outlet is connected to the boiler 4 through the coal powder pipeline 5; the burner 6 is arranged in the boiler 4; the coal quality component monitoring system 7 is used to monitor the composition of the coal raw material; the coal powder fineness detection system is used to monitor the fineness of the coal powder blown out of the powder outlet; it is used to monitor the flame of the burner 6; the coking visualization system 10 is used to monitor the coking state in the boiler 4; the display 11 is connected to the coal quality component monitoring system 7, the coal powder fineness monitoring system 8, the burner flame monitoring system 9 and the coking visualization system 10, and is used to display the monitoring results of the coal quality component monitoring system 7, the coal powder fineness monitoring system 8, the burner flame monitoring system 9 and the coking visualization system 10 in real time.

[0040] In a specific example, if Figure 1As shown, the boiler safety detection system 100 is also provided with a coal dropping pipe, one end of which is connected to the coal feeder 3, and the other end of which is connected to the raw material inlet of the coal mill 2, one end of the pulverized coal pipeline 5 is connected to the raw material inlet of the coal mill 2, and the other end of the pulverized coal pipeline 5 is connected to the boiler 4. Furthermore, the burner 6 is arranged in the boiler 4 and is located at the end of the pulverized coal pipeline 5 connected to the boiler 4.

[0041] For example Figure 1 As shown, the coal conveying device 1 is a coal conveying belt, and the coal quality composition monitoring system 7 is arranged on the upstream side of the coal feeder 3 and above the coal conveying belt. The coal quality composition monitoring system 7 can perform composition analysis on the coal raw materials on the coal conveying belt. For example, the coal quality composition monitoring system 7 can perform elemental analysis, industrial analysis, moisture analysis and ash analysis on the coal raw materials, and transmit the analysis data to the display 11. The display 11 can display the monitoring results of the coal quality composition monitoring system 7 in real time.

[0042] For example Figure 1 As shown, the coal powder fineness monitoring system 8 is arranged in the coal powder pipeline 5 and close to the powder outlet. The coal powder fineness monitoring system 8 can monitor the fineness of the coal powder blown out of the powder outlet in real time and transmit the monitoring data to the display 11. The display 11 can display the monitoring results of the coal powder fineness monitoring system 8 in real time.

[0043] For example Figure 1 As shown, one or more high-temperature resistant cameras are provided in the burner flame monitoring system 9. Furthermore, the high-temperature resistant cameras correspond one-to-one to the burners 6, and the high-temperature resistant cameras are arranged above the nozzle of the burner 6, so that the shape and color of the flame of the burner 6 can be monitored in real time, and the monitoring data can be transmitted to the display 11. The display 11 can display the monitoring results of the burner flame monitoring system 9 in real time.

[0044] For example Figure 1 As shown, a plurality of high temperature resistant cameras are provided in the coking visualization system 10. For example, the number of the high temperature resistant cameras may be four, five, six, seven or more than eight. The plurality of high temperature resistant cameras are evenly spaced along the circumferential direction of the inner wall of the furnace of the boiler 4, so as to monitor the coking condition of the furnace of the boiler 4 in real time and transmit the monitoring data to the display 11. The display 11 can display the monitoring result of the coking visualization system 10 in real time.

[0045] Furthermore, for example Figure 1As shown, the boiler safety detection system 100 is also provided with a data signal transmission system 12, one end of the data signal transmission system 12 is respectively connected to the coal quality composition monitoring system 7, the coal powder fineness monitoring system 8, the burner flame monitoring system 9 and the coking visualization system 10, and the other end of the data signal transmission system 12 is connected to the display 11. The coal quality composition monitoring system 7, the coal powder fineness monitoring system 8, the burner flame monitoring system 9 and the coking visualization system 10 can transmit the monitoring data to the display 11 through the data signal transmission system 12 and display it in real time on the display 11.

[0046] In this embodiment, when the boiler safety detection system 100 is working, the coal conveying device 1 can convey the coal raw material to the coal feeder 3, the coal feeder 3 can convey the coal raw material to the raw material inlet of the coal feeder 3 through the coal drop pipe and can accurately adjust the coal feeding amount of the pulverizer 2 according to the load requirements, and the coal raw material enters the coal feeder 3 through the raw material inlet, and the coal feeder 3 can crush the coal raw material and grind it into coal powder. Afterwards, under the action of the hot primary air at the inlet of the pulverizer 2 and the cold primary air at the inlet of the pulverizer 2, the coal powder can be dried and conveyed to the powder outlet of the pulverizer 2, the coal powder enters the coal powder pipeline 5 from the powder outlet, and then enters the furnace of the boiler 4 from the coal powder pipeline 5, and the burner 6 can cause the coal powder and air to be mixed, sprayed and burned as required.

[0047] During the operation of the boiler safety detection system 100, the coal quality composition monitoring system 7 can monitor the composition of the coal raw materials on the coal conveying device 1 in real time, the coal powder fineness monitoring system 8 can monitor the fineness of the coal powder blown out of the powder outlet of the pulverizer 2 in real time, the burner flame monitoring system 9 can monitor the shape and color of the flame of the burner 6 in real time, and the coking visualization system 10 can monitor the coking situation in the furnace of the boiler 4 in real time. The coal quality composition monitoring system 7, the coal powder fineness monitoring system 8, the burner flame monitoring system 9 and the coking visualization system 10 can transmit the monitoring data to the display 11 and display it in real time on the display 11. The operator can intuitively understand the coal quality composition, coal powder fineness and combustion situation in the boiler 4 based on the monitoring results displayed in real time on the display 11, and thus judge whether the operating status of the boiler safety detection system 100 is safe and reliable.

[0048] According to the boiler safety detection system 100 of the embodiment of the present invention, a coal conveying device 1, a coal mill 2, a coal feeder 3, a boiler 4, a burner 6, a coal quality component monitoring system 7, a coal powder fineness monitoring system 8, a burner flame monitoring system 9, a coking visualization system 10 and a display 11 are arranged in the boiler safety detection system 100. The coal mill 2 has a raw material inlet and a powder outlet. The coal conveying device 1 is connected to the raw material inlet and is used to convey the coal raw material to the coal mill 2. The coal mill 2 is used to grind the coal raw material into coal powder. The coal feeder 3 is connected between the coal conveying device 1 and the coal mill 2. The powder outlet is connected to the boiler 4 through the coal powder pipeline 5. The burner 6 is arranged in the boiler 4. The coal quality component monitoring system 7 is used to monitor the composition of the coal raw material. The coal powder fineness detection system is used to monitor the fineness of the coal powder blown out of the powder outlet and to monitor the flame of the burner 6. The coking visualization system 10 is used to monitor the coking status in the boiler 4. The display 11 is connected to the coal quality composition monitoring system 7, the coal powder fineness monitoring system 8, the burner flame monitoring system 9 and the coking visualization system 10, and is used to display the monitoring results of the coal quality composition monitoring system 7, the coal powder fineness monitoring system 8, the burner flame monitoring system 9 and the coking visualization system 10 in real time. It can monitor the coal quality composition, coal powder fineness and combustion status in the boiler 4 in real time, which helps to understand the operating status of the boiler safety detection system 100 in real time, and can effectively improve the safety and reliability of the boiler.

[0049] In one embodiment of the present invention, Figure 1 As shown, the boiler safety detection system 100 also includes a data processing module, which is connected to the coal quality composition monitoring system 7 and the display 11. The data processing module obtains the ignition temperature, explosion index and / or slagging index of the coal powder according to the composition of the coal raw material monitored by the coal quality composition monitoring system 7, and sends the ignition temperature, explosion index and / or slagging index to the display 11 for display.

[0050] For example, the data processing module obtains any one or two data of the ignition temperature, explosion index and slagging index of the coal powder according to the composition of the coal raw material monitored by the coal quality component monitoring system 7, and sends the obtained data to the display 11 for display; for another example, the data processing module obtains the ignition temperature, explosion index and slagging index of the coal powder according to the composition of the coal raw material monitored by the coal quality component monitoring system 7, and sends the obtained data to the display 11 for display.

[0051] In a specific example, one end of the data processing module is connected to the coal quality component monitoring system 7, and the other end of the data processing module is connected to the data signal transmission system 12. The data processing module calculates the ignition temperature, explosion index and slagging index of the coal powder according to the composition of the coal raw material monitored by the coal quality component monitoring system 7 through the embedded calculation formula, and sends the obtained data to the display 11 through the data signal transmission system 12 for display. In other words, the data processing module can automatically calculate the ignition temperature, explosion index and slagging index of the coal powder, and display the calculation results on the display 11 in real time.

[0052] In this embodiment, a data processing module is set in the boiler safety detection system 100, and the data processing module is connected to the coal quality composition monitoring system 7 and the display 11. The data processing module obtains the ignition temperature, explosion index and / or slagging index of the coal powder according to the composition of the coal raw material monitored by the coal quality composition monitoring system 7, and sends the ignition temperature, explosion index and / or slagging index to the display 11 for display. This can not only effectively improve the automation and intelligence level of the boiler safety detection system 100, but also help the operator to intuitively understand the characteristics of the coal raw material used by the boiler safety detection system 100, so as to timely predict potential problems and risks.

[0053] like Figure 1 and Figure 2 As shown, according to the control method of the boiler safety detection system 100 of the second embodiment of the present invention, the boiler safety detection system 100 is the boiler safety detection system 100 according to the first aspect of the present invention, and the control method includes: S1, obtaining the composition of the coal raw material.

[0054] In a specific example, if Figure 1 As shown, the coal conveying device 1 conveys the coal raw material to the coal quality composition monitoring system 7. The coal quality composition monitoring system 7 can perform composition analysis on the coal raw material. For example, the coal quality composition monitoring system 7 can perform elemental analysis, industrial analysis, moisture analysis and ash analysis on the coal raw material, so as to obtain the basic data required for calculating the ignition temperature, explosion index and slagging index of the coal powder, and transmit the basic data to the display 11 through the data signal transmission system 12 for real-time display.

[0055] S2, determining the ignition temperature, explosion index and / or slagging index of the coal powder according to the composition of the coal raw material.

[0056] For example, according to the composition of the coal raw material, any one or two of the ignition temperature, explosion index and slagging index of the coal powder are determined; for another example, according to the composition of the coal raw material, the ignition temperature, explosion index and slagging index of the coal powder are determined. In a specific example, Figure 1As shown, after the coal quality composition monitoring system 7 detects and obtains the composition data of the coal raw material, the ignition temperature, explosion index and slagging index of the coal powder are calculated based on the composition data of the coal raw material and the calculation formula. The ignition temperature, explosion index and slagging index of the coal powder can reflect the behavioral characteristics of the coal powder during the combustion process, thereby helping the operator to understand and judge the combustion state of the coal powder.

[0057] S3, monitoring and adjusting the operating state parameters of the coal mill 2, the operating state parameters of the burner 6 and / or the operating state parameters of the boiler 4 according to the ignition temperature, the explosion index and / or the slagging index.

[0058] For example, based on the ignition temperature, explosion index and / or slagging index, one or two of the operating status parameters of the coal mill 2, the operating status parameters of the burner 6 and the operating status parameters of the boiler 4 are monitored and adjusted; for another example, based on the ignition temperature, explosion index and / or slagging index, the operating status parameters of the coal mill 2, the operating status parameters of the burner 6 and the operating status parameters of the boiler 4 are monitored and adjusted.

[0059] In a specific example, the operator can monitor the operating status parameters of the pulverizer 2, the burner 6 and the boiler 4 according to the ignition temperature, explosion index and slagging index of the coal powder. When the monitored operating status parameters exceed the preset safety range, the operator needs to adjust the corresponding operating status parameters to ensure that the entire boiler safety detection system 100 is always in the best operating state. In other words, it can not only achieve efficient energy conversion, but also effectively avoid potential risks and improve the safety and reliability of the boiler.

[0060] According to the control method of the boiler safety detection system 100 of the second aspect of the embodiment of the present invention, when the boiler safety detection system 100 is running, the composition of the coal raw material is first obtained, and then the ignition temperature, explosion index and / or slagging index of the coal powder are determined according to the composition of the coal raw material. Then, according to the ignition temperature, explosion index and / or slagging index, the operating status parameters of the pulverizer 2, the operating status parameters of the burner 6 and / or the operating status parameters of the boiler 4 are monitored and adjusted. As a result, the boiler safety detection system 100 can operate safely and stably, thereby effectively improving the safety and stability of the boiler.

[0061] In one embodiment of the present invention, the operating status parameters of the coal mill 2 include: the inlet air temperature of the coal mill 2, the inlet air volume of the coal mill 2, the coal powder temperature at the powder outlet of the coal mill 2, the wind speed at the powder outlet of the coal mill 2, the CO concentration inside the coal mill 2, the coal powder fineness R90, the differential pressure of the coal mill 2, the current of the coal mill 2 and / or the loading force of the coal mill 2; the operating status parameters of the burner 6 include: the flame color, flame shape and / or slagging state of the burner 6 nozzle; the operating status parameters of the boiler 4 include: the temperature of the furnace heating surface, the slagging state of the furnace heating surface, the operating steam temperature parameters of the boiler 4, the exhaust temperature of the boiler 4, the flue gas temperature of each section of the furnace and / or the negative pressure of the furnace.

[0062] For example, the operating state parameters of coal mill 2 include one or more operating state parameters of the inlet air temperature of coal mill 2, the inlet air volume of coal mill 2, the pulverized coal temperature at the pulverized coal outlet of coal mill 2, the wind speed at the pulverized coal outlet of coal mill 2, the CO concentration inside coal mill 2, the pulverized coal fineness R90, the differential pressure of coal mill 2, the current of coal mill 2 and the loading force of coal mill 2. For example, the operating state parameters of burner 6 include one or more operating state parameters of the flame color, flame shape and slagging state of the nozzle of burner 6. For example, the operating state parameters of boiler 4 include one or more operating state parameters of the temperature of the heating surface of the furnace, the slagging state of the heating surface of the furnace, the operating steam temperature parameters of boiler 4, the exhaust temperature of boiler 4, the flue gas temperature of each section of the furnace and the negative pressure of the furnace.

[0063] This embodiment sets the operating status parameters of the coal mill 2 to the inlet air temperature of the coal mill 2, the inlet air volume of the coal mill 2, the coal powder temperature at the powder outlet of the coal mill 2, the wind speed at the powder outlet of the coal mill 2, the CO concentration inside the coal mill 2, the coal powder fineness R90, the differential pressure of the coal mill 2, the current of the coal mill 2 and / or the loading force of the coal mill 2; sets the operating status parameters of the burner 6 to the flame color, flame shape and / or slagging state of the burner 6 nozzle; sets the operating status parameters of the boiler 4 to the temperature of the furnace heating surface, the slagging state of the furnace heating surface, the operating steam temperature parameters of the boiler 4, the exhaust temperature of the boiler 4, the flue gas temperature of each section of the furnace and / or the negative pressure of the furnace, thereby effectively improving the level of refined management and regulation of the boiler safety detection system 100, thereby effectively improving the efficiency of management and regulation of the boiler safety detection system 100.

[0064] In one embodiment of the present invention, in step S3, the operating status parameters of the coal mill 2, the operating status parameters of the burner 6 and / or the operating status parameters of the boiler 4 are monitored and adjusted according to the explosion index, including: S31, according to the explosion index, obtaining the explosion index interval in which the explosion index is located.

[0065] In a specific example, when the explosion index is greater than 12 and less than 17, the coal powder is easily explosive; when the explosion index is greater than 7 and less than or equal to 12, the coal powder is moderately explosive; when the explosion index is greater than 3 and less than or equal to 7, the coal powder is difficult to explode; when the explosion index is greater than 1 and less than or equal to 3, the coal powder is difficult to explode; when the explosion index is less than or equal to 1, the coal powder is extremely difficult to explode.

[0066] S32, controlling the display 11 to issue a first alarm message corresponding to the explosion index range.

[0067] In a specific example, when the explosion index is greater than 12 and less than 17, the display 11 emits a sharp alarm sound and a voice reminder "The coal ground by the coal mill is a highly explosive coal, please monitor and adjust well"; when the explosion index is greater than 7 and less than or equal to 12, the display 11 emits a steady prompt sound "The coal ground by the coal mill is a medium explosive coal, please monitor and adjust well"; when the explosion index is greater than 3 and less than or equal to 7, the display 11 emits a prompt sound "The coal ground by the coal mill is a relatively difficult to explode coal, please monitor and adjust well"; when the explosion index is greater than 1 and less than or equal to 3, the display 11 emits a prompt sound "The coal ground by the coal mill is a difficult to explode coal, please monitor and adjust well"; when the explosion index is less than or equal to 1, the display 11 emits a prompt sound "The coal ground by the coal mill is a very difficult to explode coal, please monitor and adjust well".

[0068] S33, monitor and adjust the inlet air temperature of coal mill 2, the air and powder temperature at the powder outlet, the CO concentration inside coal mill 2, the coal powder fineness R90, the differential pressure of coal mill 2, the current of coal mill 2 and the loading force of coal mill 2 according to the explosion index range.

[0069] In a specific example, the display 11 can prompt the operator to focus on monitoring and adjusting the types of parameters according to the explosion index range, such as: the inlet air temperature of the coal mill 2, the air-powder temperature at the powder outlet, the CO concentration inside the coal mill 2, the coal powder fineness R90, the differential pressure of the coal mill 2, the current of the coal mill 2 and the loading force of the coal mill 2.

[0070] When the present embodiment monitors and adjusts the operating status parameters of the coal mill 2, the operating status parameters of the burner 6 and / or the operating status parameters of the boiler 4 according to the explosion index, the explosion index interval in which the explosion index is located is first obtained according to the explosion index, and then the display 11 is controlled to issue a first alarm message corresponding to the explosion index interval, and then the inlet air temperature of the coal mill 2, the air-powder temperature at the powder outlet, the CO concentration inside the coal mill 2, the coal powder fineness R90, the differential pressure of the coal mill 2, the current of the coal mill 2 and the loading force of the coal mill 2 are monitored and adjusted according to the explosion index interval. As a result, the operator can understand the explosiveness of the coal powder in a timely and accurate manner according to the first alarm message, and is prompted to monitor and adjust the parameters, thereby effectively improving the response rate of the boiler safety detection system 100 and the adjustment efficiency of the operator.

[0071] In one embodiment of the present invention, step S33 includes: obtaining an explosion index-coal powder fineness calculation formula corresponding to the explosion index interval, calculating a first target coal powder fineness according to the explosion index-coal powder fineness calculation formula, and adjusting the coal powder fineness R90 to the first target coal powder fineness; and / or, obtaining the air-coal ratio interval of the coal mill 2 corresponding to the explosion index interval, and adjusting the ventilation air volume of the coal mill 2 according to the air-coal ratio interval so that the CO concentration in the coal mill 2 is lower than the preset target concentration; and / or, when it is detected that the temperature of the powder outlet of the coal mill 2 exceeds the upper temperature threshold, the heating rate exceeds the heating threshold, and the pressure exceeds the pressure threshold When the value and / or the pressure increase rate exceeds the pressure increase threshold, inert steam is introduced into the coal mill 2; and / or, when it is confirmed that the shutdown conditions for stopping the coal mill 2 are met, the output of the coal feeder 3 is gradually reduced, the differential pressure of the coal mill 2 is gradually reduced, the hot primary air regulating door at the inlet of the coal mill 2 is gradually closed, and the cold primary air regulating door at the inlet of the coal mill 2 is fully opened to control the temperature of the powder outlet of the coal mill 2 to be no greater than the preset temperature threshold corresponding to the explosion index interval; when the coal feeding is completely stopped, the coal mill 2 maintains the ventilation volume for purging and continues the ventilation time corresponding to the explosion index interval, and after confirming that there is no accumulated powder in the coal mill 2 and the coal powder pipeline 5, the coal mill 2 is stopped.

[0072] In a specific example, when the explosion index is greater than 12 and less than 17, the explosion index-coal powder fineness calculation formula is R90 = 0.5nV daf +3, it should be noted that n in the above formula is the coal powder uniformity index, V daf It is the dry ash-free volatile matter of coal, measured by the coal quality component monitoring system 7. The air-coal ratio of the coal mill 2 is greater than 1.9, and the CO concentration inside the coal mill 2 is kept below 100uL / L. During the shutdown of the coal mill 2, the temperature of the powder outlet of the coal mill 2 is not greater than 70°C. When the coal feeding is completely stopped, the coal mill 2 maintains the ventilation volume for purging and continues for 10 minutes.

[0073] When the explosion index is greater than 7 and less than or equal to 12, the explosion index-coal powder fineness calculation formula is R90 = 0.5nV daf The air-coal ratio of coal mill 2 is greater than or equal to 1.7 and less than 1.9, and the CO concentration inside coal mill 2 is kept below 100uL / L. During the shutdown of coal mill 2, the temperature of the powder outlet of coal mill 2 is not greater than 75°C. When the coal feeding is completely stopped, coal mill 2 maintains the ventilation volume for purging and continues for 10 minutes.

[0074] When the explosion index is greater than 3 and less than or equal to 7, the explosion index-coal powder fineness calculation formula is R90 = 0.5nV daf -2, the air-coal ratio of coal mill 2 is greater than or equal to 1.6 and less than 1.7, the CO concentration inside coal mill 2 is kept below 100uL / L, and during the shutdown of coal mill 2, the temperature of the powder outlet of coal mill 2 is not greater than 80°C. When the coal feeding is completely stopped, the coal mill 2 maintains the ventilation volume for purging and continues for 10 minutes.

[0075] When the explosion index is greater than 1 and less than or equal to 3, the explosion index-coal powder fineness calculation formula is R90 = 0.5nV daf -5, the air-coal ratio of coal mill 2 is greater than or equal to 1.4 and less than 1.5, the CO concentration inside coal mill 2 is kept below 100uL / L, and during the shutdown of coal mill 2, the temperature of the powder outlet of coal mill 2 is not greater than 85°C. When the coal feeding is completely stopped, the coal mill 2 maintains the ventilation volume for purging and continues for 5 minutes.

[0076] When the explosion index is less than or equal to 1, the explosion index-coal powder fineness calculation formula is R90 = 0.5nV daf -4, the air-coal ratio of coal mill 2 is greater than or equal to 1.4 and less than 1.5, the CO concentration inside coal mill 2 is kept below 100uL / L, and during the shutdown of coal mill 2, the temperature of the powder outlet of coal mill 2 is not greater than 90°C. When the coal feeding is completely stopped, the coal mill 2 maintains the ventilation volume for purging and lasts for 3 minutes.

[0077] That is to say, the larger the explosion index, the larger the first target coal powder fineness, the larger the air-coal ratio of the coal mill 2, the lower the upper limit of the temperature of the powder outlet of the coal mill 2 during the shutdown of the coal mill 2, and the longer the time for the coal mill 2 to maintain ventilation for purging after stopping coal feeding. The larger the explosion index, the more unstable the coal powder and the easier it is to explode. Increasing the first target coal powder fineness can increase the coal powder particle size, thereby effectively reducing the possibility of coal powder explosion; increasing the air-coal ratio of the coal mill 2 can effectively increase the flow rate of coal powder and air, thereby accelerating the flow rate of CO, thereby effectively reducing the CO concentration inside the coal mill 2 to below the preset target concentration, thereby effectively reducing the risk of explosion; in the process of shutting down the coal mill 2, lowering the upper limit of the temperature of the powder outlet of the coal mill 2 can effectively reduce the possibility of coal powder explosion; when the coal feeding is completely stopped, increasing the time for the coal mill 2 to maintain ventilation for purging can avoid the accumulation of powder in the coal mill 2 and the coal powder pipeline 5, thereby effectively ensuring the cleaning effect of the coal mill 2 and the coal powder pipeline 5.

[0078] When monitoring and adjusting according to the explosion index interval, this embodiment calculates the first target coal powder fineness through the explosion index-coal powder fineness calculation formula, adjusts the coal powder fineness R90 to the first target coal powder fineness, and can effectively reduce the possibility of coal powder explosion; by obtaining the air-coal ratio interval of the coal mill 2 corresponding to the explosion index interval, the ventilation air volume of the coal mill 2 is adjusted according to the air-coal ratio interval, so that the CO concentration in the coal mill 2 is lower than the preset target concentration, thereby effectively reducing the explosion risk; when it is detected that the temperature of the powder outlet of the coal mill 2 exceeds the temperature upper threshold, the heating rate exceeds the heating threshold, the pressure exceeds the pressure threshold and / or the pressure increase rate exceeds the pressure increase threshold, by introducing inert steam into the coal mill 2, the coal mill 2 can be prevented from exploding. 2 is damaged, thereby effectively protecting the coal mill 2; when it is confirmed that the shutdown conditions for stopping the coal mill 2 are met, by gradually reducing the output of the coal feeder 3, gradually reducing the differential pressure of the coal mill 2, gradually closing the inlet hot primary air regulating door of the coal mill 2, and fully opening the inlet cold primary air regulating door of the coal mill 2, the temperature of the powder outlet of the coal mill 2 is controlled not to be greater than the preset temperature threshold value corresponding to the explosion index interval, which can effectively reduce the possibility of coal powder explosion; when the coal feeding is completely stopped, the coal mill 2 is kept at a ventilation volume for purging and continues for a ventilation time corresponding to the explosion index interval. After confirming that there is no accumulated powder in the coal mill 2 and the coal powder pipeline 5, the coal mill 2 is shut down, which can effectively ensure the cleaning effect of the coal mill 2 and the coal powder pipeline 5 and safely shut down the coal mill 2.

[0079] In one embodiment of the present invention, in step S3, the operating status parameters of the coal mill 2, the operating status parameters of the burner 6 and / or the operating status parameters of the boiler 4 are monitored and adjusted according to the ignition temperature, including: S310, according to the ignition temperature, obtaining the ignition temperature range corresponding to the ignition temperature.

[0080] In a specific example, when the ignition temperature is greater than 638°C, the ignition temperature is in an extremely difficult to stabilize zone; when the ignition temperature is greater than 613°C and less than or equal to 638°C, the ignition temperature is in a difficult to stabilize zone; when the ignition temperature is greater than 593°C and less than or equal to 613°C, the ignition temperature is in a medium stable zone; when the ignition temperature is greater than 560°C and less than or equal to 593°C, the ignition temperature is in an easy to stabilize zone; when the ignition temperature is less than or equal to 560°C, the ignition temperature is in a lignite zone.

[0081] S320, controlling the display 11 to issue a second alarm message corresponding to the ignition temperature range.

[0082] In a specific example, when the ignition temperature is greater than 638°C, the display 11 issues a rapid reminder sound "The coal type ground by the coal mill is extremely difficult to ignite, and the combustion is extremely difficult to stabilize. Please monitor and adjust the flame"; when the ignition temperature is greater than 613°C and less than or equal to 638°C, the display 11 issues a rapid reminder sound "The coal type ground by the coal mill is difficult to ignite, and the combustion is difficult to stabilize. Please monitor and adjust the flame"; when the ignition temperature is greater than 593°C and less than or equal to 613°C, the display 11 issues a reminder sound The display 11 emits a steady reminder sound “The coal ground by the coal mill is of medium ignition type, and the combustion is of medium and stable quality. Please do a good job of flame monitoring and adjustment”; when the ignition temperature is greater than 560℃ and less than or equal to 593℃, the display 11 emits a steady reminder sound “The coal ground by the coal mill is of easy ignition type, and the combustion is easy and stable. Please do a good job of flame monitoring and adjustment”; when the ignition temperature is less than or equal to 560℃, the display 11 emits a very steady reminder sound “The coal ground by the coal mill is of extremely easy ignition type, and the combustion is extremely easy and stable. Please do a good job of flame monitoring and adjustment”.

[0083] S330, according to the ignition temperature range, monitor and adjust the coal powder fineness R90 in the coal powder pipeline 5, the wind speed in the coal powder pipeline 5, the flame color and flame shape of the burner 6 nozzle and the furnace negative pressure.

[0084] In a specific example, the display 11 can prompt the operator to focus on monitoring and adjusting the types of parameters according to the ignition temperature range, such as: the coal powder fineness R90 in the coal powder pipeline 5, the wind speed in the coal powder pipeline 5, the flame color of the burner 6 nozzle, the flame shape and the furnace negative pressure.

[0085] In one embodiment of the present invention, step S330 includes: obtaining an ignition temperature-coal powder fineness calculation formula corresponding to the ignition temperature range, calculating a second target coal powder fineness according to the ignition temperature-coal powder fineness calculation formula, and adjusting the coal powder fineness R90 to the second target coal powder fineness according to the second target coal powder fineness; and / or, obtaining a first target wind speed range of the powder outlet corresponding to the ignition temperature range, adjusting the wind speed of the powder outlet to the first target wind speed range; and / or, the burner 6 is a front-to-back counter-swirl burner 6, and according to the ignition temperature range, the central wind opening of the burner 6 is adjusted to The central wind opening interval corresponds to the ignition temperature interval, the swirl intensity of the outer secondary air is adjusted to the first swirl intensity interval corresponding to the ignition temperature interval, the swirl opening of the outer secondary air is adjusted to the corresponding swirl opening interval, and the swirl intensity of the inner secondary air is adjusted to the second swirl intensity interval corresponding to the ignition temperature interval; and / or, the burner 6 is a direct current burner 6 of a tangential circle combustion mode, and according to the ignition temperature interval, the peripheral wind opening of the burner 6 is adjusted to the peripheral wind opening interval corresponding to the ignition temperature interval, and the opening of the secondary air door is adjusted to the secondary air door opening interval corresponding to the ignition temperature interval.

[0086] In a specific example, when the ignition temperature is greater than 638°C, the ignition temperature-coal powder fineness calculation formula is R90 = 0.5nV daf -8, the first target wind speed is greater than or equal to 20m / s and less than or equal to 21m / s. When the burner 6 is a front-to-back counter-swirl burner 6, the central wind opening of the burner 6 is adjusted to 10%-20%, the swirl opening of the outer secondary air is adjusted to the maximum, and the swirl intensity of the inner secondary air is adjusted to the maximum. When the burner 6 is a direct current burner 6 with a tangential combustion mode, the peripheral wind opening of the burner 6 is adjusted to 10%-20%, and the opening of the secondary air door is adjusted to the maximum.

[0087] When the ignition temperature is greater than 613℃ and less than or equal to 638℃, the calculation formula of ignition temperature-coal powder fineness is R90=0.5nV daf -6, the first target wind speed is greater than or equal to 21m / s and less than or equal to 23m / s. When the burner 6 is a front-to-back counter-swirl burner 6, the central wind opening of the burner 6 is adjusted to 20%-30%, the swirl opening of the outer secondary air is adjusted to the maximum, and the swirl intensity of the inner secondary air is adjusted to the maximum. When the burner 6 is a direct current burner 6 with a tangential combustion mode, the peripheral wind opening of the burner 6 is adjusted to 20%-30%, and the opening of the secondary air door is adjusted to the maximum.

[0088] When the ignition temperature is greater than 593℃ and less than or equal to 613℃, the calculation formula of ignition temperature-coal powder fineness is R90=0.5nV daf-3. The first target wind speed is greater than or equal to 23m / s and less than or equal to 25m / s. When the burner 6 is a front-to-back counter-swirl burner 6, the central wind opening of the burner 6 is adjusted to 30%-50%, the swirl opening of the outer secondary air is adjusted to 80%-100%, and the swirl intensity of the inner secondary air is adjusted to 80%-100%. When the burner 6 is a direct current burner 6 with a tangential combustion mode, the peripheral wind opening of the burner 6 is adjusted to 30%-50%, and the opening of the secondary air door is adjusted to 80%-100%.

[0089] When the ignition temperature is greater than 560℃ and less than or equal to 593℃, the calculation formula of ignition temperature-coal powder fineness is R90=0.5nV daf -2. The first target wind speed is greater than or equal to 25m / s and less than or equal to 26m / s. When the burner 6 is a front-to-back counter-swirl burner 6, the central wind opening of the burner 6 is adjusted to 50%-80%, the swirl opening of the outer secondary air is adjusted to 50%-80%, and the swirl intensity of the inner secondary air is adjusted to 50%-80%. When the burner 6 is a direct current burner 6 with a tangential combustion mode, the peripheral wind opening of the burner 6 is adjusted to 50%-80%, and the opening of the secondary air door is adjusted to 50%-80%.

[0090] When the ignition temperature is less than or equal to 560℃, the calculation formula of ignition temperature-coal powder fineness is R90=0.5nV daf +2, the first target wind speed is greater than or equal to 26m / s and less than or equal to 30m / s. When the burner 6 is a front-to-back counter-swirl burner 6, the central wind opening of the burner 6 is adjusted to 80%-100%, the swirl opening of the outer secondary air is adjusted to 20%-50%, and the swirl intensity of the inner secondary air is adjusted to 30%-50%. When the burner 6 is a direct current burner 6 with a tangential combustion mode, the peripheral wind opening of the burner 6 is adjusted to 20%-50%, and the opening of the secondary air door is adjusted to 10%-50%.

[0091] It should be noted that when adjusting the front and rear counter-swirl burners 6 or the direct current burners 6 with tangential combustion mode, adjustments are made according to the color and shape of the flame in the burner flame monitoring system 9, and the color and shape of the flame are adjusted to the best, so that the flame color is as bright as possible and the flame shape is as stable as possible, and the negative pressure in the furnace is maintained within a reasonable range.

[0092] That is to say, the higher the ignition temperature, the smaller the second target coal powder fineness, the smaller the first target wind speed, when the burner 6 is a front and rear counter-swirling burner 6, the smaller the central wind opening of the burner 6, the larger the swirl opening of the outer secondary air, the greater the swirl intensity of the inner secondary air, and when the burner 6 is a direct current burner 6 with a tangential combustion mode, the smaller the peripheral wind opening of the burner 6, the larger the opening of the secondary air door.

[0093] The higher the ignition temperature, the harder it is to ignite the coal powder and the more unstable the combustion. Reducing the second target coal powder fineness can reduce the coal powder particle size, thereby effectively increasing the combustion efficiency of the coal powder, and making the coal powder easier to burn; reducing the first target wind speed can effectively reduce the flow speed of coal powder and air, so that the coal powder and air are fully mixed, and then effectively improve the efficiency and stability of coal powder combustion; when the burner 6 is a front and rear counter-swirling burner 6, reducing the central wind opening of the burner 6, so that the coal powder and air are fully mixed, and then effectively improve the efficiency and stability of coal powder combustion, increasing the swirl opening of the external secondary air and the swirl intensity of the internal secondary air, can effectively increase the oxygen content required for combustion, and thus can effectively improve the efficiency and stability of coal powder combustion; when the burner 6 is a direct current burner 6 of tangential combustion mode, reducing the peripheral wind opening of the burner 6, so that the coal powder and air are fully mixed, and then effectively improve the efficiency and stability of coal powder combustion, increasing the opening of the secondary air door, can effectively increase the oxygen content required for combustion, and thus can effectively improve the efficiency and stability of coal powder combustion.

[0094] In this embodiment, when monitoring and adjusting according to the ignition temperature range, the ignition temperature-coal powder fineness calculation formula corresponding to the ignition temperature range is obtained, and the second target coal powder fineness is calculated according to the ignition temperature-coal powder fineness calculation formula. According to the second target coal powder fineness, the coal powder fineness R90 is adjusted to the second target coal powder fineness, which can effectively reduce the combustion difficulty of coal powder and effectively increase the combustion efficiency of coal powder; by obtaining the first target wind speed range of the powder outlet corresponding to the ignition temperature range, the wind speed of the powder outlet is adjusted to the first target wind speed range, which can effectively improve the efficiency and stability of coal powder combustion; according to the ignition temperature range, the center of the burner 6 is adjusted to the first target wind speed range. The air opening is adjusted to the central air opening range corresponding to the ignition temperature range, the swirl intensity of the outer secondary air is adjusted to the first swirl intensity range corresponding to the ignition temperature range, the swirl opening of the outer secondary air is adjusted to the corresponding swirl opening range, and the swirl intensity of the inner secondary air is adjusted to the second swirl intensity range corresponding to the ignition temperature range, which can effectively improve the efficiency and stability of coal powder combustion; according to the ignition temperature range, the peripheral wind opening of the burner 6 is adjusted to the peripheral wind opening range corresponding to the ignition temperature range, and the opening of the secondary air door is adjusted to the secondary air door opening range corresponding to the ignition temperature range, which can effectively improve the efficiency and stability of coal powder combustion.

[0095] In one embodiment of the present invention, in step S3, the operating status parameters of the coal mill 2, the operating status parameters of the burner 6 and / or the operating status parameters of the boiler 4 are monitored and adjusted according to the slagging index, including: S3100, according to the slagging index, obtaining the slagging index interval corresponding to the slagging index.

[0096] In a specific example, when the slagging index is greater than 2.5, the slagging level is severe; when the slagging index is greater than 2.25 and less than or equal to 2.5, the slagging level is medium to heavy; when the slagging index is greater than 1.75 and less than or equal to 2.25, the slagging level is medium; when the slagging index is greater than 1.5 and less than or equal to 1.75, the slagging level is medium to light; when the slagging index is less than 1.5, the slagging level is mild.

[0097] S3200, controlling the display 11 to issue a third alarm message corresponding to the slagging index interval.

[0098] In a specific example, when the slagging index is greater than 2.5, the display 11 issues a rapid reminder sound "The coal type ground by the coal mill is a coal type with severe slagging. Please monitor and adjust the slagging of the burner nozzle 6 and the heating surface of the furnace"; when the slagging index is greater than 2.25 and less than or equal to 2.5, the display 11 issues a rapid reminder sound "The coal type ground by the coal mill is a coal type with medium to heavy slagging. Please monitor and adjust the slagging of the burner nozzle 6 and the heating surface of the furnace"; when the slagging index is greater than 1.75 and less than or equal to 2 .25, the display 11 issues a prompt sound "the coal ground by the coal mill is a medium-slagging coal, please monitor and adjust the slagging at the burner 6 nozzle and the heating surface of the furnace"; when the slagging index is greater than 1.5 and less than or equal to 1.75, the display 11 issues a prompt sound "the coal ground by the coal mill is a light-slagging coal, please monitor and adjust the slagging at the burner 6 nozzle and the heating surface of the furnace"; when the slagging index is less than 1.5, the display 11 issues a prompt sound "the coal ground by the coal mill is a light-slagging coal".

[0099] S3300, based on the slagging index range, monitor and adjust the slagging state of the burner 6 nozzle and its vicinity, the slagging state of the furnace heating surface, the operating steam temperature parameters of the boiler 4, the wall temperature of the furnace heating surface, the exhaust temperature of the boiler 4, the flue gas temperature of each section of the furnace and the furnace negative pressure.

[0100] In a specific example, the display 11 can prompt the operator to focus on monitoring and adjusting the types of parameters based on the slagging index range, such as: the slagging state of the burner 6 nozzle and its vicinity, the slagging state of the furnace heating surface, the operating steam temperature parameters of the boiler 4, the wall temperature of the furnace heating surface, the exhaust temperature of the boiler 4, the flue gas temperature of each section of the furnace and the furnace negative pressure.

[0101] In one embodiment of the present invention, step S330 includes: confirming the current operating load of the boiler 4, obtaining the corresponding oxygen content range of the operating oxygen content of the boiler 4 according to the operating load and the slagging index range, and adjusting the operating oxygen content in the boiler 4 to the oxygen content range; and / or, obtaining the slagging index-coal powder fineness calculation formula corresponding to the slagging index range, calculating the third target coal powder fineness according to the slagging index-coal powder fineness calculation formula, and adjusting the coal powder fineness R90 to the third target coal powder fineness; and / or, obtaining the second target wind speed range of the powder outlet corresponding to the slagging index range, adjusting the wind speed of the powder outlet to the second target wind speed range; and / or, obtaining The soot blowing frequency of the furnace and flue of the boiler 4 corresponding to the slagging index interval is controlled to control the boiler 4 to soot blow according to the soot blowing frequency; and / or, the proportion interval of the blending ratio of the slagging coal in the coal raw material corresponding to the slagging index interval is obtained, the blending ratio of the slagging coal in the coal raw material is adjusted to the proportion interval, the combustion height position of the coal powder in the boiler 4 corresponding to the slagging index interval is obtained, and the coal powder is controlled to burn at the combustion height position; and / or, the slagging state of the burner 6 nozzle and its vicinity and the slagging state of the furnace heating surface are obtained, and when it is confirmed that the coking state of the burner 6 nozzle and / or the coking state of the heating surface meet the decoking conditions, a decoking agent is added to the area meeting the decoking conditions.

[0102] In a specific example, when the slagging index is greater than 2.5, when the operating load is 100%, the oxygen content of the boiler 4 is in the range of 3%-4%, when the operating load is 75%, the oxygen content of the boiler 4 is in the range of 4%-5%, and when the operating load is 50%, the oxygen content of the boiler 4 is in the range of 5%-6.5%. When the slagging index is greater than 2.5, the slagging index-coal powder fineness calculation formula is R90=0.5nV daf -4, the second target wind speed is greater than or equal to 21m / s and less than or equal to 23m / s, the soot blowing frequency of the furnace and flue of boiler 4 is once every 6-8 hours, the blending ratio of slagging coal in the coal raw material is less than or equal to 20%, and the combustion height position of coal powder in boiler 4 is the lower layer.

[0103] When the slagging index is greater than 2.25 and less than or equal to 2.5, when the operating load is 100%, the oxygen content of boiler 4 is in the range of 3.3%-4.7%, when the operating load is 75%, the oxygen content of boiler 4 is in the range of 4%-4.7%, and when the operating load is 50%, the oxygen content of boiler 4 is in the range of 5%-6%. When the slagging index is greater than 2.25 and less than or equal to 2.5, the slagging index-coal powder fineness calculation formula is R90=0.5nV daf-2, the second target wind speed is greater than or equal to 21m / s and less than or equal to 23m / s, the soot blowing frequency of the furnace and flue of the boiler 4 is once every 8-12 hours, the blending ratio of slagging coal in the coal raw material is less than or equal to 25%, and the combustion height position of the coal powder in the boiler 4 is the middle and lower layer.

[0104] When the slagging index is greater than 1.75 and less than or equal to 2.25, when the operating load is 100%, the oxygen content of the boiler 4 is in the range of 3%-3.3%, when the operating load is 75%, the oxygen content of the boiler 4 is in the range of 3.5%-4.2%, and when the operating load is 50%, the oxygen content of the boiler 4 is in the range of 4.5%-5%. When the slagging index is greater than 1.75 and less than or equal to 2.25, the slagging index-coal powder fineness calculation formula is R90=0.5nV daf The second target wind speed is greater than or equal to 23m / s and less than or equal to 25m / s. The soot blowing frequency of the furnace and flue of boiler 4 is once every 12-15 hours. The blending ratio of slagging coal in the coal raw material is less than or equal to 30%. The combustion height position of coal powder in boiler 4 is the middle and lower layer.

[0105] When the slagging index is greater than 1.5 and less than or equal to 1.75, when the operating load is 100%, the oxygen content of boiler 4 is in the range of 2.8%-3.3%, when the operating load is 75%, the oxygen content of boiler 4 is in the range of 3.3%-4%, and when the operating load is 50%, the oxygen content of boiler 4 is in the range of 4%-5%. When the slagging index is greater than 1.5 and less than or equal to 1.75, the slagging index-coal powder fineness calculation formula is R90=0.5nV daf The second target wind speed is greater than or equal to 24m / s and less than or equal to 27m / s. The soot blowing frequency of the furnace and flue of boiler 4 is once every 12-15 hours. The blending ratio of slagging coal in the coal raw material is less than or equal to 50%. The combustion height position of coal powder in boiler 4 is the middle and lower layer.

[0106] When the slagging index is less than 1.5, when the operating load is 100%, the oxygen content of boiler 4 is in the range of 2.5%-3%, when the operating load is 75%, the oxygen content of boiler 4 is in the range of 3%-3.8%, and when the operating load is 50%, the oxygen content of boiler 4 is in the range of 4%-5%. When the slagging index is less than 1.5, the slagging index-coal powder fineness calculation formula is R90=0.5nV daf The second target wind speed is greater than or equal to 24 m / s and less than or equal to 30 m / s, and the soot blowing frequency of the furnace and flue of the boiler 4 is once every 15-48 hours.

[0107] It should be noted that the coking visualization system 10 can obtain the slagging state of the burner 6 nozzle and its vicinity and the slagging state of the heating surface of the furnace. When the coking state of the burner 6 nozzle or the coking state of the heating surface meets the decoking conditions, a decoking agent is added to the area that meets the decoking conditions.

[0108] That is to say, the larger the slagging index is, and when the operating load is constant, the greater the oxygen content of the boiler 4. In addition, the larger the slagging index is, the smaller the third target coal powder fineness is, the smaller the second target wind speed is, the higher the soot blowing frequency of the furnace and flue of the boiler 4 is, the lower the upper limit of the blending ratio of the slagging coal in the coal raw material is, and the lower the combustion height position of the coal powder in the boiler 4 is.

[0109] The larger the slagging index is, the easier it is for the pulverized coal to slag when it is burned. Reducing the third target pulverized coal fineness can reduce the pulverized coal particle size, thereby effectively increasing the combustion efficiency of the pulverized coal, allowing the pulverized coal to burn fully and reduce slagging; reducing the second target wind speed can effectively reduce the flow rate of the pulverized coal and the air, allowing the pulverized coal and the air to mix fully, thereby effectively improving the efficiency of the pulverized coal combustion, allowing the pulverized coal to burn fully and reduce slagging; increasing the soot blowing frequency of the furnace and flue of the boiler 4 can directly reduce slagging; reducing the upper limit of the blending ratio of the slagging coal in the coal raw material can reduce the ash produced after the pulverized coal is burned, thereby reducing slagging; reducing the combustion height position of the pulverized coal in the boiler 4 can effectively increase the time that the pulverized coal is in contact with oxygen in the furnace of the boiler 4, thereby increasing the combustion time, allowing the pulverized coal to burn fully and reduce slagging.

[0110] When monitoring and adjusting according to the slagging index interval, this embodiment confirms the current operating load of the boiler 4, and obtains the corresponding oxygen range of the operating oxygen content of the boiler 4 according to the operating load and the slagging index interval, and adjusts the operating oxygen content in the boiler 4 to the oxygen range, so as to ensure that the coal powder has sufficient oxygen supply during combustion, so that the coal powder can be fully burned and slagging is reduced; by obtaining the slagging index-coal powder fineness calculation formula corresponding to the slagging index interval, the third target coal powder fineness is calculated according to the slagging index-coal powder fineness calculation formula, and the coal powder fineness R90 is adjusted to the third target coal powder fineness, which can effectively increase the combustion efficiency of the coal powder, so that the coal powder can be fully burned and slagging is reduced; by obtaining the second target wind speed range of the powder outlet corresponding to the slagging index interval, and adjusting the wind speed of the powder outlet to the second target wind speed range, the coal powder and the air can be fully mixed, so that the coal powder can be fully burned and the slagging is reduced. Less slagging; by obtaining the soot blowing frequency of the furnace and flue of the boiler 4 corresponding to the slagging index interval, and controlling the boiler 4 to soot blow according to the soot blowing frequency, slagging can be directly reduced; by obtaining the proportion interval of the blending ratio of the slagging coal in the coal raw material corresponding to the slagging index interval, adjusting the blending ratio of the slagging coal in the coal raw material to the proportion interval, obtaining the combustion height position of the coal powder in the boiler 4 corresponding to the slagging index interval, and controlling the combustion of the coal powder at the combustion height position, the ash content generated after the combustion of the coal powder can be reduced, and the combustion time of the coal powder can be effectively increased, so that the coal powder can be fully burned and slagging can be reduced; by obtaining the slagging state of the burner 6 nozzle and its vicinity and the slagging state of the furnace heating surface, when it is confirmed that the coking state of the burner 6 nozzle and / or the coking state of the heating surface meets the decoking conditions, a decoking agent is added to the area meeting the decoking conditions, so that the slagging situation can be understood in time and the decoking treatment can be effectively achieved.

[0111] The following will refer to Figure 1-Figure 3 A boiler safety detection system 100 according to a specific embodiment of the present invention is described.

[0112] The boiler safety detection system 100 includes a coal conveying device 1, a coal mill 2, a coal feeder 3, a boiler 4, a pulverized coal pipeline 5, a burner 6, a coal quality composition monitoring system 7, a data processing module, a pulverized coal fineness monitoring system 8, a burner flame monitoring system 9, a coking visualization system 10, a display 11, a coal drop pipe and a data signal transmission system 12.

[0113] The coal mill 2 has a raw material inlet and a powder outlet. The burner flame monitoring system 9 is provided with a high temperature resistant camera. The coking visualization system 10 is provided with a high temperature resistant camera.

[0114] The coal conveying device 1 is a coal conveying belt, which is connected to one end of a coal feeder 3. The other end of the coal feeder 3 is connected to a raw material inlet of a coal mill 2 through a coal drop pipe. The powder outlet of the coal mill 2 is connected to a furnace of a boiler 4 through a coal powder pipeline 5. A burner 6 is arranged in the furnace of the boiler 4 and is located at one end where the coal powder pipeline 5 is connected to the furnace.

[0115] The coal quality component monitoring system 7 is arranged on one side upstream of the coal feeder 3 and above the coal conveyor belt, and the coal quality component monitoring system 7 is connected to the data processing module. The coal powder fineness monitoring system 8 is arranged in the coal powder pipeline 5 and near the powder outlet. The high temperature resistant camera in the burner flame monitoring system 9 corresponds to the burner 6 one by one, and the high temperature resistant camera is arranged above the nozzle of the burner 6. The high temperature resistant cameras in the coking visualization system 10 are evenly spaced along the circumferential direction of the inner wall of the furnace of the boiler 4.

[0116] One end of the data signal transmission system 12 is respectively connected to the data processing module, the coal powder fineness monitoring system 8, the burner flame monitoring system 9 and the coking visualization system 10, and the other end of the data signal transmission system 12 is connected to the display 11. The coal quality composition monitoring system 7, the coal powder fineness monitoring system 8, the burner flame monitoring system 9 and the coking visualization system 10 can transmit the monitoring data to the display 11 through the data signal transmission system 12 and display it in real time on the display 11.

[0117] The following will refer to Figure 1-Figure 3 A control method of a boiler safety detection system 100 according to a specific embodiment of the present invention is described.

[0118] The control method of the boiler safety detection system 100 includes: S1, obtaining the composition of the coal raw material;

[0119] S2, determine the ignition temperature, explosion index and slagging index of the coal powder according to the composition of the coal raw material;

[0120] S31, according to the explosion index, obtaining the explosion index interval in which the explosion index is located;

[0121] S32, controlling the display 11 to issue a first alarm message corresponding to the explosion index interval;

[0122] S33, monitoring and adjusting the inlet air temperature of coal mill 2, the air and powder temperature at the powder outlet, the CO concentration inside coal mill 2, the coal powder fineness R90, the differential pressure of coal mill 2, the current of coal mill 2 and the loading force of coal mill 2 according to the explosion index range;

[0123] S310, according to the ignition temperature, obtaining an ignition temperature range corresponding to the ignition temperature;

[0124] S320, controlling the display 11 to issue a second alarm message corresponding to the ignition temperature range;

[0125] S330, monitoring and adjusting the coal powder fineness R90 in the coal powder pipeline 5, the wind speed in the coal powder pipeline 5, the flame color and flame shape of the burner 6 nozzle and the furnace negative pressure according to the ignition temperature range;

[0126] S3100, according to the slagging index, obtaining a slagging index interval corresponding to the slagging index;

[0127] S3200, controlling the display 11 to issue a third alarm message corresponding to the slagging index interval;

[0128] S3300, based on the slagging index range, monitor and adjust the slagging state of the burner 6 nozzle and its vicinity, the slagging state of the furnace heating surface, the operating steam temperature parameters of the boiler 4, the wall temperature of the furnace heating surface, the exhaust temperature of the boiler 4, the flue gas temperature of each section of the furnace and the furnace negative pressure.

[0129] like Figure 1 As shown, the coal conveying device 1 conveys the coal raw material to the coal quality composition monitoring system 7. The coal quality composition monitoring system 7 can perform composition analysis on the coal raw material. For example, the coal quality composition monitoring system 7 can perform elemental analysis, industrial analysis, moisture analysis and ash analysis on the coal raw material, so as to obtain the basic data required for calculating the ignition temperature, explosion index and slagging index of the coal powder, and transmit the basic data to the display 11 through the data signal transmission system 12 for real-time display.

[0130] After the coal quality composition monitoring system 7 detects and obtains the composition data of the coal raw material, the ignition temperature, explosion index and slagging index of the coal powder are calculated based on the composition data of the coal raw material and the calculation formula. The ignition temperature, explosion index and slagging index of the coal powder can reflect the behavioral characteristics of the coal powder during the combustion process, thereby helping the operator to understand and judge the combustion state of the coal powder.

[0131] When the explosion index of coal powder is 12.3, the display 11 emits a rapid alarm and a voice reminder "The coal type ground by the coal mill is extremely explosive, please monitor and adjust it well". The first target coal powder fineness is 22%. The coal powder fineness R90 is adjusted to the first target coal powder fineness by adjusting the speed of the dynamic separator; the air-coal ratio of coal mill 2 is adjusted to 2, and the CO concentration inside coal mill 2 is kept below 100uL / L.

[0132] When it is detected that the temperature at the powder outlet of the coal mill 2 exceeds the upper temperature threshold, the heating rate exceeds the heating threshold, the pressure exceeds the pressure threshold and / or the pressure increase rate exceeds the pressure increase threshold, inerting steam is introduced into the coal mill 2. If necessary, the coal mill 2 needs to be urgently shut down for isolation and inerting; when it is confirmed that the shutdown conditions for stopping the coal mill 2 are met, the output of the coal feeder 3 is gradually reduced, the differential pressure of the coal mill 2 is gradually reduced, the hot primary air regulating door at the inlet of the coal mill 2 is gradually closed, and the cold primary air regulating door at the inlet of the coal mill 2 is fully opened to control the temperature of the powder outlet of the coal mill 2 to be no more than 70°C; when the coal feeding is completely stopped, the coal mill 2 maintains the ventilation volume for purging and continues for 10 minutes. After confirming that there is no accumulated powder in the coal mill 2 and the coal powder pipeline 5, the coal mill 2 is shut down.

[0133] When the explosion index of coal powder is 9, the display 11 emits a steady prompt sound "The coal type ground by the coal mill is medium-explosive coal type, please monitor and adjust well". The first target coal powder fineness is 20%, and the coal powder fineness R90 is adjusted to the first target coal powder fineness by adjusting the speed of the dynamic separator; the air-coal ratio of coal mill 2 is adjusted to 1.8, and the CO concentration inside coal mill 2 is kept below 100uL / L.

[0134] When it is detected that the temperature at the powder outlet of the coal mill 2 exceeds the upper temperature threshold, the heating rate exceeds the heating threshold, the pressure exceeds the pressure threshold and / or the pressure increase rate exceeds the pressure increase threshold, inerting steam is introduced into the coal mill 2. If necessary, the coal mill 2 needs to be urgently shut down for isolation and inerting; when it is confirmed that the shutdown conditions for stopping the coal mill 2 are met, the output of the coal feeder 3 is gradually reduced, the differential pressure of the coal mill 2 is gradually reduced, the hot primary air regulating door at the inlet of the coal mill 2 is gradually closed, and the cold primary air regulating door at the inlet of the coal mill 2 is fully opened to control the temperature of the powder outlet of the coal mill 2 to be no more than 73°C; when the coal feeding is completely stopped, the coal mill 2 maintains the ventilation volume for purging and continues for 10 minutes. After confirming that there is no accumulated powder in the coal mill 2 and the coal powder pipeline 5, the coal mill 2 is shut down.

[0135] When the explosion index of coal powder is 5, the display 11 issues a prompt sound "The coal type ground by the coal mill is a type of coal that is difficult to explode, please monitor and adjust it well". The first target coal powder fineness is 18%. The coal powder fineness R90 is adjusted to the first target coal powder fineness by adjusting the speed of the dynamic separator; the air-coal ratio of coal mill 2 is adjusted to 1.65, and the CO concentration inside coal mill 2 is kept below 100uL / L.

[0136] When it is detected that the temperature at the powder outlet of coal mill 2 exceeds the upper temperature threshold, the heating rate exceeds the heating threshold, the pressure exceeds the pressure threshold and / or the pressure increase rate exceeds the pressure increase threshold, inerting steam is introduced into coal mill 2, and if necessary, coal mill 2 is urgently shut down for isolation and inerting; when it is confirmed that the shutdown conditions for stopping coal mill 2 are met, the output of coal feeder 3 is gradually reduced, the differential pressure of coal mill 2 is gradually reduced, the hot primary air regulating door at the inlet of coal mill 2 is gradually closed, and the cold primary air regulating door at the inlet of coal mill 2 is fully opened to control the temperature of the powder outlet of coal mill 2 to be no more than 79°C; when coal feeding is completely stopped, coal mill 2 maintains the ventilation volume for purging and continues for 10 minutes, and after confirming that there is no accumulated powder in coal mill 2 and coal powder pipeline 5, coal mill 2 is shut down.

[0137] When the explosion index of coal powder is 2, the display 11 issues a prompt sound "The coal type ground by the coal mill is difficult to explode, please monitor and adjust well". The first target coal powder fineness is 15%, and the coal powder fineness R90 is adjusted to the first target coal powder fineness by adjusting the speed of the dynamic separator; the air-coal ratio of coal mill 2 is adjusted to 1.45, and the CO concentration inside coal mill 2 is kept below 100uL / L.

[0138] When it is detected that the temperature at the powder outlet of the coal mill 2 exceeds the upper temperature threshold, the heating rate exceeds the heating threshold, the pressure exceeds the pressure threshold and / or the pressure increase rate exceeds the pressure increase threshold, inerting steam is introduced into the coal mill 2. If necessary, the coal mill 2 needs to be urgently shut down for isolation and inerting; when it is confirmed that the shutdown conditions for stopping the coal mill 2 are met, the output of the coal feeder 3 is gradually reduced, the differential pressure of the coal mill 2 is gradually reduced, the hot primary air regulating door at the inlet of the coal mill 2 is gradually closed, and the cold primary air regulating door at the inlet of the coal mill 2 is fully opened to control the temperature of the powder outlet of the coal mill 2 to be no more than 84°C; when the coal feeding is completely stopped, the coal mill 2 maintains the ventilation volume for purging and continues for 5 minutes. After confirming that there is no accumulated powder in the coal mill 2 and the coal powder pipeline 5, the coal mill 2 is shut down.

[0139] When the explosion index of coal powder is 0.5, the display 11 issues a prompt sound "The coal type ground by the coal mill is extremely difficult to explode, please monitor and adjust well". The first target coal powder fineness is 14%, and the coal powder fineness R90 is adjusted to the first target coal powder fineness by adjusting the speed of the dynamic separator; the air-coal ratio of coal mill 2 is adjusted to 1.4, and the CO concentration inside coal mill 2 is kept below 100uL / L.

[0140] When it is detected that the temperature at the powder outlet of the coal mill 2 exceeds the upper temperature threshold, the heating rate exceeds the heating threshold, the pressure exceeds the pressure threshold and / or the pressure increase rate exceeds the pressure increase threshold, inerting steam is introduced into the coal mill 2. If necessary, the coal mill 2 needs to be urgently shut down for isolation and inerting; when it is confirmed that the shutdown conditions for stopping the coal mill 2 are met, the output of the coal feeder 3 is gradually reduced, the differential pressure of the coal mill 2 is gradually reduced, the hot primary air regulating door at the inlet of the coal mill 2 is gradually closed, and the cold primary air regulating door at the inlet of the coal mill 2 is fully opened to control the temperature of the powder outlet of the coal mill 2 to be no more than 90°C; when the coal feeding is completely stopped, the coal mill 2 maintains the ventilation volume for purging and continues for 3 minutes. After confirming that there is no accumulated powder in the coal mill 2 and the coal powder pipeline 5, the coal mill 2 is shut down.

[0141] When the ignition temperature is 650℃, the display 11 emits a rapid prompt sound "The coal type ground by the coal mill is extremely difficult to ignite, and the combustion is extremely difficult to stabilize. Please monitor and adjust the flame". The second target coal powder fineness is 13%. The coal powder fineness R90 is adjusted to the second target coal powder fineness by adjusting the rotation speed of the dynamic separator; the first target wind speed is 20m / s, and the wind speed at the powder outlet is adjusted to the first target wind speed; when the burner 6 is a front and rear counter-swirling burner 6, the central wind opening of the burner 6 is adjusted to 12%, the swirl intensity of the outer secondary air is adjusted to 100%, and the swirl intensity of the inner secondary air is adjusted to 100%. According to the color and shape of the flame in the burner flame monitoring system 9, adjust the color and shape of the flame to the best, try to make the flame color bright and the flame shape stable, and keep the negative pressure in the furnace within the range of -100-(+)50Pa.

[0142] When the ignition temperature is 620℃, the display 11 issues a rapid prompt sound "The coal type ground by the coal mill is difficult to ignite, and the combustion is difficult to be stable. Please monitor and adjust the flame well". The second target coal powder fineness is 15%. The coal powder fineness R90 is adjusted to the second target coal powder fineness by adjusting the rotation speed of the dynamic separator; the first target wind speed is 22m / s, and the wind speed at the powder outlet is adjusted to the first target wind speed; when the burner 6 is a front and rear counter-swirling burner 6, the central wind opening of the burner 6 is adjusted to 25%, the swirl intensity of the outer secondary air is adjusted to 100%, and the swirl intensity of the inner secondary air is adjusted to 100%. According to the color and shape of the flame in the burner flame monitoring system 9, adjust the color and shape of the flame to the best, try to make the flame color bright and the flame shape stable, and keep the negative pressure in the furnace within the range of -150-(+)50Pa.

[0143] When the ignition temperature is 605℃, the display 11 issues a prompt sound "The coal type ground by the coal mill is a medium ignition coal type, and the combustion is medium and stable. Please monitor and adjust the flame". The second target coal powder fineness is 16%. The coal powder fineness R90 is adjusted to the second target coal powder fineness by adjusting the rotation speed of the dynamic separator; the first target wind speed is 24m / s, and the wind speed at the powder outlet is adjusted to the first target wind speed; when the burner 6 is a front and rear counter-swirling burner 6, the central wind opening of the burner 6 is adjusted to 40%, the swirl intensity of the outer secondary air is adjusted to 80%, and the swirl intensity of the inner secondary air is adjusted to 80%. According to the color and shape of the flame in the burner flame monitoring system 9, adjust the color and shape of the flame to the best, try to make the flame color bright and the flame shape stable, and keep the negative pressure in the furnace within the range of -100-(+)40Pa.

[0144] When the ignition temperature is 575℃, the display 11 emits a steady prompt sound "The coal ground by the coal mill is easy to ignite and the combustion is stable. Please monitor and adjust the flame". The second target coal powder fineness is 17%. The coal powder fineness R90 is adjusted to the second target coal powder fineness by adjusting the rotation speed of the dynamic separator; the first target wind speed is 25.5m / s, and the wind speed at the powder outlet is adjusted to the first target wind speed; when the burner 6 is a front and rear counter-swirling burner 6, the central wind opening of the burner 6 is adjusted to 70%, the swirl intensity of the outer secondary air is adjusted to 65%, and the swirl intensity of the inner secondary air is adjusted to 55%. According to the color and shape of the flame in the burner flame monitoring system 9, adjust the color and shape of the flame to the best, try to make the flame color bright and the flame shape stable, and keep the negative pressure in the furnace within the range of -100-(+)30Pa.

[0145] When the ignition temperature is 515℃, the display 11 emits a very steady prompt sound "The coal ground by the coal mill is very easy to ignite, and the combustion is very easy and stable. Please monitor and adjust the flame well". The second target coal powder fineness is 20%. The coal powder fineness R90 is adjusted to the second target coal powder fineness by adjusting the rotation speed of the dynamic separator; the first target wind speed is 28m / s, and the wind speed at the powder outlet is adjusted to the first target wind speed; when the burner 6 is a front and rear counter-swirling burner 6, the central wind opening of the burner 6 is adjusted to 100%, the swirl intensity of the outer secondary air is adjusted to 20%, and the swirl intensity of the inner secondary air is adjusted to 30%. According to the color and shape of the flame in the burner flame monitoring system 9, adjust the color and shape of the flame to the best, try to make the flame color bright and the flame shape stable, and keep the negative pressure in the furnace within the range of -200-(+)50Pa.

[0146] When the slagging index is 2.8, the display 11 issues a rapid reminder sound "The coal type ground by the coal mill is a serious slagging coal type, please monitor and adjust the slagging of the burner 6 nozzle and the heating surface of the furnace". When the operating load is 100%, the operating oxygen content of the boiler 4 is 3.5%; the third target coal powder fineness is 15%, and the coal powder fineness R90 is adjusted to the third target coal powder fineness by adjusting the speed of the dynamic separator; the second target wind speed is 22m / s, and the wind speed at the powder outlet is adjusted to the second target wind speed; the soot blowing frequency of the furnace and flue of the boiler 4 is once every 6 hours; the output of the coal mill 2 is 50t / h. Obtain the slagging state of the burner 6 nozzle and its vicinity and the slagging state of the furnace heating surface. When it is confirmed that the coking state of the burner 6 nozzle and / or the coking state of the heating surface meet the decoking conditions, add a decoking agent to the area that meets the decoking conditions.

[0147] When the slagging index is 2.3, the display 11 issues a rapid reminder sound "The coal type ground by the coal mill is a heavy type of coal with medium slagging. Please monitor and adjust the slagging of the burner 6 nozzle and the heating surface of the furnace". When the operating load is 100%, the operating oxygen content of the boiler 4 is 3.3%; the third target coal powder fineness is 17%, and the coal powder fineness R90 is adjusted to the third target coal powder fineness by adjusting the speed of the dynamic separator; the second target wind speed is 22.5m / s, and the wind speed at the powder outlet is adjusted to the second target wind speed; the soot blowing frequency of the furnace and flue of the boiler 4 is once every 10 hours; the output of the coal mill 2 is 62.5t / h. The slagging state of the burner 6 nozzle and its vicinity and the slagging state of the heating surface of the furnace are obtained. When it is confirmed that the coking state of the burner 6 nozzle and / or the coking state of the heating surface meet the decoking conditions, a decoking agent is added to the area that meets the decoking conditions.

[0148] When the slagging index is 2, the display 11 issues a prompt sound "The coal type ground by the coal mill is medium slagging coal, please monitor and adjust the slagging of the burner 6 nozzle and the heating surface of the furnace". When the operating load is 100%, the operating oxygen content of the boiler 4 is 3.1%; the third target coal powder fineness is 19%, and the coal powder fineness R90 is adjusted to the third target coal powder fineness by adjusting the speed of the dynamic separator; the second target wind speed is 24m / s, and the wind speed at the powder outlet is adjusted to the second target wind speed; the soot blowing frequency of the furnace and flue of the boiler 4 is once every 14 hours; the output of the coal mill 2 is 75t / h. Obtain the slagging state of the burner 6 nozzle and its vicinity and the slagging state of the heating surface of the furnace, and when it is confirmed that the coking state of the burner 6 nozzle and / or the coking state of the heating surface meet the decoking conditions, add a decoking agent to the area that meets the decoking conditions.

[0149] When the slagging index is 1.6, the display 11 issues a prompt sound "The coal type ground by the coal mill is a light coal type with medium slagging. Please monitor and adjust the slagging of the burner 6 nozzle and the furnace heating surface". When the operating load is 100%, the operating oxygen content of boiler 4 is 2.9%; the third target coal powder fineness is 19%, and the coal powder fineness R90 is adjusted to the third target coal powder fineness by adjusting the speed of the dynamic separator; the second target wind speed is 26m / s, and the wind speed at the powder outlet is adjusted to the second target wind speed; the soot blowing frequency of the furnace and flue of boiler 4 is once every 15 hours.

[0150] When the slagging index is 1.2, the display 11 emits a prompt sound "The coal type ground by the coal mill is a slightly slagging coal type". When the operating load is 100%, the operating oxygen content of boiler 4 is 2.7%; the third target coal powder fineness is 19%, and the coal powder fineness R90 is adjusted to the third target coal powder fineness by adjusting the speed of the dynamic separator; the second target wind speed is 28m / s, and the wind speed at the powder outlet is adjusted to the second target wind speed; the soot blowing frequency of the furnace and flue of boiler 4 is once every 30 hours.

[0151] Through this boiler safety detection system 100 and the control method of the boiler safety detection system 100, the coal quality composition, coal powder fineness and combustion conditions in the boiler 4 can be monitored in real time, and according to the ignition temperature, explosion index and slagging index of the coal powder, the operating state of the boiler safety detection system 100 can be monitored and adjusted in real time, so that the boiler safety detection system 100 can operate safely and stably, thereby effectively improving the safety and stability of the boiler.

[0152] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0153] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0154] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0155] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0156] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A boiler safety detection system, characterized in that: include: Coal handling equipment; A coal mill, wherein the coal mill has a raw material inlet and a powder outlet, the coal conveying device is connected to the raw material inlet and is used to convey the coal raw material to the coal mill, and the coal mill is used to grind the coal raw material into coal powder; A coal feeder connected between the coal conveying device and the coal mill; A boiler, wherein the powder outlet is connected to the boiler via a powdered coal pipeline; a burner, the burner being arranged in the boiler; A coal quality component monitoring system, wherein the coal quality component monitoring system is used to monitor the composition of the coal raw material; A coal powder fineness monitoring system, the coal powder fineness detection system is used to monitor the fineness of the coal powder blown out of the powder outlet; A burner flame monitoring system for monitoring the flame of the burner; A coking visualization system, wherein the coking visualization system is used to monitor the coking state in the boiler; A display, wherein the display is connected to the coal quality composition monitoring system, the coal powder fineness monitoring system, the burner flame monitoring system and the coking visualization system, and is used for displaying the monitoring results of the coal quality composition monitoring system, the coal powder fineness monitoring system, the burner flame monitoring system and the coking visualization system in real time.

2. The boiler safety detection system according to claim 1, characterized in that: Also includes: A data processing module, wherein the data processing module is connected to the coal quality composition monitoring system and the display, and the data processing module obtains the ignition temperature, explosion index and / or slagging index of the coal powder according to the composition of the coal raw material monitored by the coal quality composition monitoring system, and sends the ignition temperature, the explosion index and / or the slagging index to the display for display.

3. A control method for a boiler safety detection system, characterized in that: The boiler safety detection system is a boiler safety detection system according to any one of claims 1 to 2, and the control method comprises: S1, obtaining the composition of the coal raw material; S2, determining the ignition temperature, explosion index and / or slagging index of the pulverized coal according to the composition of the coal raw material; S3, monitoring and adjusting the operating state parameters of the coal mill, the operating state parameters of the burner and / or the operating state parameters of the boiler according to the ignition temperature, the explosion index and / or the slagging index.

4. The control method of the boiler safety detection system according to claim 3, characterized in that: The operating state parameters of the coal mill include: coal mill inlet air temperature, coal mill inlet air volume, coal powder temperature at the coal mill powder outlet, wind speed at the coal mill powder outlet, CO concentration inside the coal mill, coal powder fineness R90, coal mill differential pressure, coal mill current and / or coal mill loading force; The operating state parameters of the burner include: flame color, flame shape and / or slagging state of the burner nozzle; The operating state parameters of the boiler include: the temperature of the furnace heating surface, the slagging state of the furnace heating surface, the boiler operating steam temperature parameters, the boiler exhaust temperature, the flue gas temperature of each section of the furnace and / or the furnace negative pressure.

5. The control method of the boiler safety detection system according to claim 3, characterized in that: In step S3, monitoring and adjusting the operating state parameters of the coal mill, the operating state parameters of the burner and / or the operating state parameters of the boiler according to the explosion index includes: S31, according to the explosion index, obtaining the explosion index interval in which the explosion index is located; S32, controlling the display to issue a first alarm message corresponding to the explosion index range; S33, according to the explosion index range, monitor and adjust the inlet air temperature of the coal mill, the air and powder temperature at the powder outlet, the CO concentration inside the coal mill, the coal powder fineness R90, the coal mill differential pressure, the coal mill current and the coal mill loading force.

6. The control method of the boiler safety detection system according to claim 5, characterized in that: Step S33 includes: Obtaining an explosion index-coal powder fineness calculation formula corresponding to the explosion index interval, calculating a first target coal powder fineness according to the explosion index-coal powder fineness calculation formula, and adjusting the coal powder fineness R90 to the first target coal powder fineness; and / or, Obtaining the air-to-coal ratio interval of the coal mill corresponding to the explosion index interval, and adjusting the ventilation air volume of the coal mill according to the air-to-coal ratio interval so that the CO concentration in the coal mill is lower than a preset target concentration; and / or, When it is detected that the temperature of the powder outlet of the coal mill exceeds the upper temperature threshold, the heating rate exceeds the heating threshold, the pressure exceeds the pressure threshold and / or the pressure increase rate exceeds the pressure increase threshold, inerting steam is introduced into the coal mill; and / or, When it is confirmed that the shutdown conditions for the coal mill are met, the output of the coal feeder is gradually reduced, the differential pressure of the coal mill is gradually reduced, the hot primary air regulating door at the inlet of the coal mill is gradually closed, and the cold primary air regulating door at the inlet of the coal mill is fully opened to control the temperature of the powder outlet of the coal mill to be no greater than the preset temperature threshold corresponding to the explosion index range; when the coal feeding is completely stopped, the coal mill maintains the ventilation volume for purge and continues the ventilation time corresponding to the explosion index range, and after confirming that there is no accumulated powder in the coal mill and the coal powder pipeline, the coal mill is shut down.

7. The control method of the boiler safety detection system according to claim 3, characterized in that: In step S3, monitoring and adjusting the operating state parameters of the coal mill, the operating state parameters of the burner and / or the operating state parameters of the boiler according to the ignition temperature includes: S310, acquiring an ignition temperature range corresponding to the ignition temperature according to the ignition temperature; S320, controlling the display to issue a second alarm message corresponding to the ignition temperature range; S330, monitoring and adjusting the coal powder fineness R90 in the coal powder pipeline, the wind speed in the coal powder pipeline, the flame color and flame shape of the burner nozzle and the furnace negative pressure according to the ignition temperature range.

8. The control method of the boiler safety detection system according to claim 7, characterized in that: Step S330 includes: Obtaining an ignition temperature-coal powder fineness calculation formula corresponding to the ignition temperature range, calculating a second target coal powder fineness according to the ignition temperature-coal powder fineness calculation formula, and adjusting the coal powder fineness R90 to the second target coal powder fineness according to the second target coal powder fineness; and / or, Obtaining a first target wind speed interval of the powder outlet corresponding to the ignition temperature interval, and adjusting the wind speed of the powder outlet to the first target wind speed interval; and / or, The burner is a front-to-back swirl burner. According to the ignition temperature range, the central air opening of the burner is adjusted to the central air opening range corresponding to the ignition temperature range, the swirl intensity of the outer secondary air is adjusted to the first swirl intensity range corresponding to the ignition temperature range, the swirl opening of the outer secondary air is adjusted to the corresponding swirl opening range, and the swirl intensity of the inner secondary air is adjusted to the second swirl intensity range corresponding to the ignition temperature range; and / or, The burner is a direct current burner of tangential combustion mode. According to the ignition temperature range, the peripheral wind opening of the burner is adjusted to the peripheral wind opening range corresponding to the ignition temperature range, and the opening of the secondary air door is adjusted to the secondary air door opening range corresponding to the ignition temperature range.

9. The control method of the boiler safety detection system according to claim 3, characterized in that: In step S3, according to the slagging index, monitoring and adjusting the operating state parameters of the coal mill, the operating state parameters of the burner and / or the operating state parameters of the boiler include: S3100, obtaining a slagging index interval corresponding to the slagging index according to the slagging index; S3200, controlling the display to issue a third alarm message corresponding to the slagging index range; S3300, monitor and adjust the slagging state of the burner nozzle and its vicinity, the slagging state of the furnace heating surface, the boiler operating steam temperature parameters, the furnace heating surface wall temperature, the boiler exhaust temperature, the flue gas temperature of each section of the furnace and the furnace negative pressure according to the slagging index range.

10. The control method of the boiler safety detection system according to claim 9, characterized in that: Step S330 includes: confirming the current operating load of the boiler, obtaining a corresponding oxygen content range of the boiler operating oxygen content according to the operating load and the slagging index range, and adjusting the operating oxygen content in the boiler to the oxygen content range; and / or, Obtaining a slagging index-coal powder fineness calculation formula corresponding to the slagging index interval, calculating a third target coal powder fineness according to the slagging index-coal powder fineness calculation formula, and adjusting the coal powder fineness R90 to the third target coal powder fineness; and / or, Obtaining a second target wind speed interval of the powder outlet corresponding to the slagging index interval, and adjusting the wind speed of the powder outlet to the second target wind speed interval; and / or, Acquiring soot blowing frequencies of the furnace and flue of the boiler corresponding to the slagging index interval, and controlling the boiler to soot blow according to the soot blowing frequencies; and / or, Obtaining a ratio interval of the blending ratio of the slagging coal in the coal raw material corresponding to the slagging index interval, adjusting the blending ratio of the slagging coal in the coal raw material to the ratio interval, obtaining the combustion height position of the pulverized coal in the boiler corresponding to the slagging index interval, and controlling the pulverized coal to burn at the combustion height position; and / or, The slagging state of the burner nozzle and its vicinity and the slagging state of the furnace heating surface are obtained, and when it is confirmed that the coking state of the burner nozzle and / or the coking state of the heating surface meet the decoking conditions, a decoking agent is added to the area meeting the decoking conditions.

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