Dry distillation boiler for coke production based on in-furnace environment control

Abstract

The invention relates to the field of dry distillation boilers, in particular to a dry distillation boiler for coke production based on in-furnace environment control, which is used for solving the problem that coke quality is influenced by unstable in-furnace environment control caused by mutual influence of in-furnace temperature and in-furnace gas atmosphere control during coke production. Comprising a temperature detection unit, an air inlet control unit, a fluctuation supervision unit, a condition management unit and a comprehensive evaluation unit. The heat exchange loop is arranged outside the dry distillation boiler, air inlet channels are selected and distributed according to the temperature condition in the boiler, the impact of air inlet action on the stable environment in the boiler during operation of the boiler is reduced, and meanwhile the environment in the dry distillation boiler is collected in a three-dimensional mode; the temperature condition and the gas atmosphere condition in the boiler are obtained, meanwhile, combined control is conducted according to the temperature condition and the gas atmosphere condition in the boiler, fluctuation of the environment in the boiler caused by mutual interference when multiple parameters are adjusted and controlled is avoided, and stability of the environment in the boiler is guaranteed.

Description

Technical Field

[0001] The invention relates to the field of dry distillation boilers, in particular to a dry distillation boiler for coke production based on furnace environment control. Background Art

[0002] Coke is an important furnace charge that provides heat and reducing agent for blast furnace smelting. Coke is an indispensable furnace charge in blast furnace ironmaking, and its impact rate on the progress of blast furnace ironmaking technology is more than 30%. It occupies an important position in blast furnace ironmaking concentrate technology. According to smelting requirements, blast furnace coke must have appropriate chemical and physical properties, including thermal properties at high temperatures. The large-scale blast furnace capacity and the intensification of smelting have put forward more stringent requirements on the quality of blast furnace coke. Through the dissection of the blast furnace, the role and behavior of coke in the blast furnace are comprehensively and systematically analyzed, and the quality requirements for blast furnace coke are proposed based on this. The reduction of coke particles and coke dust in coke is studied. The role of coke in blast furnace ironmaking is: first, it is the main source of heat. The heat provided by the combustion of carbon in blast furnace ironmaking accounts for 71% of the total heat source of blast furnace ironmaking. Second, it is a reducing agent. The reduction effect of coke is to reduce iron ore in the form of C and CO. Third, it is the skeleton role of the charge. Coke plays a skeleton role in the blast furnace, supporting the ironmaking raw materials and acting as a ventilation window for coal gas.

[0003] Therefore, the production quality of coke directly affects the effect of subsequent smelting, and it is necessary to carry out more precise production process control on the coke production process to ensure the production quality of coke. In the coke production process, the main factors affecting coke are: heating speed, gas atmosphere in the furnace, material layer thickness and coke discharge thickness. Among them, the material layer thickness and coke discharge thickness can be continuously optimized and controlled through production experiments, and the control effect is relatively stable. However, the heating speed and the gas atmosphere in the furnace are easily affected by various factors during the production process, resulting in fluctuations, which are the main factors leading to the difference in coke quality. At the same time, when the gas in the furnace is introduced, the gas entering will affect the temperature in the furnace, which makes the heating speed and the gas atmosphere in the furnace interfere with each other, making it more difficult to accurately control.

[0004] In view of the above technical problems, this application proposes a solution. Summary of the invention

[0005] The present invention collects the internal environment of the dry distillation boiler in a three-dimensional manner during the production process of the dry distillation boiler, obtains the temperature and gas atmosphere conditions inside the boiler, and simultaneously performs joint control according to the temperature and gas atmosphere conditions inside the boiler, thereby avoiding interference between multiple parameters during adjustment and control, which leads to fluctuations in the environment inside the boiler, ensuring the stability of the internal environment of the boiler, and solving the problem that during coke production, the temperature and gas atmosphere inside the furnace will affect each other during control, thereby leading to unstable control of the environment inside the furnace and affecting the quality of coke, and proposes a dry distillation boiler for coke production based on furnace environment control.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A dry distillation boiler for coke production based on furnace environment control comprises a boiler body, an exhaust port is arranged at the top of the boiler body, and a heat absorbing ring is fixedly installed on the side wall of the boiler body;

[0008] The interior of the heat absorption ring is close to the outer wall of the boiler furnace body, a reversing valve is installed on the outer wall of the boiler furnace body, the outer wall of the reversing valve is connected to multiple groups of first air intake pipes, the side wall of the reversing valve is installed with an air intake manifold, the air intake manifold is distributed inside the heat absorption ring, and the air intake manifold is installed with a second air intake pipe at the other end of the heat absorption ring, wherein the second air intake pipe is connected to the boiler furnace body;

[0009] The reversing valve is controlled by the furnace environment control system to adjust the operating state and valve opening of the reversing valve;

[0010] The furnace environment control system includes a temperature detection unit, an air intake control unit, a fluctuation monitoring unit, a condition management unit and a comprehensive evaluation unit.

[0011] As a preferred embodiment of the present invention, the reversing valve is provided with two groups of gas outlets, one group is directly connected to the boiler furnace body, and the other group is connected to the intake manifold. The two groups of gas outlets are switched and controlled by the reversing valve to control the opening and closing conditions of the two groups of gas outlets of the reversing valve and the valve opening distribution ratio.

[0012] As a preferred embodiment of the present invention, the temperature detection unit is used to monitor the temperature inside the boiler furnace body and obtain the temperature distribution inside the boiler furnace body;

[0013] The air intake control unit is used to control the reversing valve and correct the gas outlet direction of the reversing valve;

[0014] The fluctuation monitoring unit obtains the temperature distribution through the temperature detection unit, and performs regional temperature fluctuation monitoring on the temperature distribution on the time axis;

[0015] The condition management unit collects the gas atmosphere in the boiler furnace, performs standardized detection of the production atmosphere according to the collected gas atmosphere, and generates an air intake ratio control signal according to the monitoring result;

[0016] The comprehensive evaluation unit performs statistics on the air intake process and the temperature fluctuation signal, performs a comprehensive evaluation based on all statistical results, and generates a production process stability evaluation result.

[0017] As a preferred embodiment of the present invention, the temperature detection unit is configured to set high-temperature sensors at different positions inside the boiler furnace body, collect the temperature inside the boiler furnace body according to the high-temperature sensors, and record the collected data as the initial temperature;

[0018] A plurality of high-temperature sensors are arranged at equal intervals in a vertical direction of the boiler body, and a plurality of high-temperature sensors are arranged at equal intervals in a circumferential direction at the bottom of the boiler body.

[0019] As a preferred embodiment of the present invention, the temperature detection unit compares the initial temperatures along the circumferential direction in pairs. If the difference between a group of initial temperatures and other initial temperatures is greater than a set value, the initial temperatures are deleted, otherwise they are retained.

[0020] The temperature detection unit performs arithmetic averaging on the retained circumferential temperatures to obtain an average temperature, and uses the average temperature as the temperature data at the collection point at the bottom of the boiler;

[0021] The temperature detection unit selects the initial temperature of the temperature collection point adjacent to the collection point at the bottom of the boiler in the vertical direction, calculates the difference between the two initial temperatures to obtain the interval temperature difference, compares the interval temperature difference with the set temperature difference threshold, and retains or deletes the initial temperature according to the comparison result.

[0022] As a preferred embodiment of the present invention, the method for the fluctuation monitoring unit to monitor regional temperature fluctuations is:

[0023] The fluctuation monitoring unit divides the boiler body into multiple areas with each temperature monitoring point in the vertical direction as the center, and the temperature in each area is recorded based on the initial temperature at the temperature monitoring point;

[0024] Each time the fluctuation monitoring unit obtains the initial temperature, the fluctuation monitoring unit records the time of obtaining the initial temperature, thereby recording the initial temperature sequentially in the form of a time axis to obtain a temperature change sequence for each area. The fluctuation monitoring unit divides the adjacent initial temperature differences in the temperature change sequence by the interval time to obtain the temperature change speed for each area, and records the initial temperature difference as the temperature change amplitude.

[0025] As a preferred embodiment of the present invention, the condition management unit records the collected gas atmosphere, obtains the component ratio corresponding to each gas, and compares the component ratio of each gas with the set range, and records the component ratio as a qualified ratio or an unqualified ratio according to the comparison result;

[0026] The condition management unit records the unqualified proportions and adaptively adjusts the components of the unqualified proportions during air intake.

[0027] As a preferred embodiment of the present invention, the intake control unit obtains the temperature change rate and the temperature change amplitude, compares the temperature change rate and the temperature change amplitude with the corresponding threshold values, and generates a temperature fluctuation signal or a temperature stability signal according to the comparison result. At the same time, the intake control unit obtains the intake opening ratio of the current reversing valve. If a temperature fluctuation signal is generated, the intake opening ratio is adjusted to increase the flow ratio of the intake manifold.

[0028] As a preferred embodiment of the present invention, the comprehensive evaluation unit counts the number of times the unqualified ratio is generated and the number of times the temperature fluctuation signal is generated, and records them as the total number of changes. The total number of changes is proportional to the set number threshold to obtain the change ratio. If the change ratio is greater than the set threshold, a production instability signal is generated. If the change ratio is less than the set threshold, a production stability signal is generated to obtain a production process stability evaluation result.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The present invention arranges a heat exchange loop outside the retorting boiler. When controlling the gas atmosphere inside the boiler, the air intake channel is selected and allocated according to the temperature conditions inside the boiler, and the air intake pipeline is passed through the heat exchange loop before entering the boiler, thereby reducing the impact of the air intake action during the operation of the boiler on the stability of the furnace environment, improving the stability of the furnace environment, and reducing the periodic fluctuation of the temperature.

[0031] 2. In the present invention, during the production process of the dry distillation boiler, the environment inside the dry distillation boiler is collected in three dimensions to obtain the temperature and gas atmosphere conditions inside the boiler, and joint control is performed based on the temperature and gas atmosphere conditions inside the boiler, thereby simultaneously controlling the temperature and gas atmosphere conditions inside the boiler, ensuring the stability of the internal environment of the boiler, and avoiding interference between multiple parameters during adjustment and control, resulting in fluctuations in the environment inside the boiler.

[0032] 3. In the present invention, a statistical analysis is performed on the gas grouping and temperature fluctuations in the production process of the dry distillation boiler, and the production process of the boiler is evaluated based on the statistical analysis results, so that the production quality of the coke can be estimated to a certain extent in advance, and the production situation can be corrected in subsequent production based on the evaluation of the production process, thereby optimizing the production process control. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0034] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0035] Figure 2 is a schematic structural diagram of a second air intake duct according to the present invention;

[0036] Figure 3 is a system block diagram of the present invention;

[0037] Figure 4 It is a system flow chart of the present invention.

[0038] In the figure: 1. boiler body; 2. heat absorption loop; 3. exhaust port; 4. intake manifold; 5. reversing valve; 6. first intake pipe; 7. second intake pipe. DETAILED DESCRIPTION

[0039] The technical scheme of the present invention will be described clearly and completely in conjunction with the embodiments below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Embodiment 1:

[0041] See also Figure 1 - Figure 4 As shown, a dry distillation boiler for coke production based on furnace environment control comprises a boiler body 1, an exhaust port 3 is arranged at the top of the boiler body 1, and a heat absorbing loop 2 is fixedly installed on the side wall of the boiler body 1;

[0042] The interior of the heat absorption loop 2 is close to the outer wall of the boiler furnace body 1, and a reversing valve 5 is installed on the outer wall of the boiler furnace body 1. The outer wall of the reversing valve 5 is connected to multiple groups of first air intake pipes 6. An air intake manifold 4 is installed on the side wall of the reversing valve 5. The air intake manifold 4 is distributed inside the heat absorption loop 2. The air intake manifold 4 is installed with a second air intake pipe 7 at the other end of the heat absorption loop 2, wherein the second air intake pipe 7 is connected to the boiler furnace body 1;

[0043] The reversing valve 5 is provided with two groups of gas outlets, one group is directly connected to the boiler furnace body 1, and the other group is connected to the intake manifold 4. The two groups of gas outlets are switched and controlled by the reversing valve 5 to control the opening and closing conditions of the two groups of gas outlets of the reversing valve 5 and the valve opening distribution ratio. The reversing valve 5 is controlled by the furnace environment control system to adjust the operating state and valve opening of the reversing valve 5.

[0044] Embodiment 2:

[0045] See also Figure 1 - Figure 4 As shown, the furnace environment control system includes a temperature detection unit, an air intake control unit, a fluctuation monitoring unit, a condition management unit and a comprehensive evaluation unit;

[0046] The temperature detection unit is configured with high-temperature sensors at different positions inside the boiler furnace body 1, collects the temperature inside the boiler furnace body 1 according to the high-temperature sensors, and records the collected data as the initial temperature;

[0047] Wherein, multiple groups of high temperature sensors are arranged at equal intervals along the vertical direction of the boiler furnace body 1, and multiple groups of high temperature sensors are arranged at equal intervals along the circumferential direction at the bottom of the boiler furnace body 1;

[0048] The temperature detection unit compares the initial temperatures along the circumferential direction in pairs. If the difference between a group of initial temperatures and other initial temperatures is greater than the set value, the initial temperatures are deleted, otherwise they are retained.

[0049] The temperature detection unit performs arithmetic averaging on the retained circumferential temperatures to obtain the average temperature, and uses the average temperature as the temperature data at the collection point at the bottom of the boiler;

[0050] The temperature detection unit selects the initial temperature of the temperature collection point adjacent to the collection point at the bottom of the boiler in the vertical direction, calculates the difference between the two initial temperatures, obtains the interval temperature difference, and compares the interval temperature difference with the set temperature difference threshold. If the interval temperature difference is greater than the set temperature difference threshold, the initial temperature is deleted; if the interval temperature difference is less than or equal to the set temperature difference threshold, the initial temperature is retained, thereby obtaining the temperature distribution inside the boiler furnace body 1;

[0051] The fluctuation monitoring unit obtains the temperature distribution through the temperature detection unit, and divides the boiler body 1 into multiple areas with each temperature monitoring point in the vertical direction as the center. The temperature in each area is based on the initial temperature at the temperature monitoring point, thereby obtaining the temperature distribution of each area;

[0052] The fluctuation monitoring unit records the time of obtaining the initial temperature each time when obtaining the initial temperature, so as to record the initial temperature in sequence in the form of a time axis to obtain a temperature change sequence for each area. The fluctuation monitoring unit divides the difference between adjacent initial temperatures in the temperature change sequence by the interval time to obtain the temperature change speed for each area, and records the initial temperature difference as the temperature change amplitude;

[0053] The condition management unit collects the gas atmosphere in the boiler furnace body 1, and records the collected gas atmosphere to obtain the component ratio corresponding to each gas, and compares the component ratio of each gas with the set range. If the gas component ratio is within the set component ratio range, the component ratio is recorded as a qualified ratio. If the gas component ratio is outside the set component ratio range, the component ratio is recorded as an unqualified ratio, wherein the unqualified ratio includes two situations: the component is too high and the component is too low, which respectively correspond to the gas component ratio being higher than the set component ratio range and the gas component ratio being lower than the set component ratio range;

[0054] The conditional management unit records the unqualified proportions and adaptively adjusts the components with unqualified proportions during air intake, that is, when the components are too high, the proportion of the corresponding components in the intake air is reduced, and when the components are too low, the proportion of the corresponding components in the intake air is increased;

[0055] The air intake control unit obtains the temperature change speed and the temperature change range, and compares the temperature change speed and the temperature change range with the corresponding threshold values ​​respectively. If the temperature change speed is greater than the set threshold value, a temperature change too fast signal is generated; if the temperature change speed is less than or equal to the set threshold value, a temperature change normal signal is generated; if the temperature change range is greater than the set threshold value, a temperature change too large signal is generated; if the temperature change range is less than or equal to the set threshold value, a temperature change normal signal is generated;

[0056] When two sets of normal temperature change signals are generated, a temperature stable signal is generated, and when any one of the excessive temperature change signals or the excessive temperature change signals is generated, a temperature fluctuation signal is generated;

[0057] At the same time, the air intake control unit obtains the current air intake opening ratio of the reversing valve 5, and if a temperature stabilization signal is generated, the current air intake opening ratio of the reversing valve 5 is maintained unchanged;

[0058] If a temperature fluctuation signal is generated, the temperature fluctuation signal is judged. If it is a signal of excessive temperature change, the intake opening ratio is adjusted so that all the intake gas passes through the intake manifold 4, and after circling the heat exchange loop for one circle, it is taken in through the second intake pipe 7. If it is a signal of excessive temperature change, the intake opening ratio is adjusted to increase the flow ratio of the intake manifold 4.

[0059] The comprehensive evaluation unit counts the temperature distribution of the boiler furnace body 1 and the unqualified ratio of the air intake process, counts the number of times the unqualified ratio is generated and the number of times the temperature fluctuation signal is generated, and records them as the total number of changes. The total number of changes is proportional to the set number threshold to obtain the change ratio. If the change ratio is greater than the set threshold, a production instability signal is generated. If the change ratio is less than the set threshold, a production stability signal is generated to obtain a stable evaluation result of the production process.

[0060] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A dry distillation boiler for coke production based on furnace environment control, characterized in that: It comprises a boiler furnace body (1), the top of the boiler furnace body (1) is provided with an exhaust port (3), and the side wall of the boiler furnace body (1) is fixedly provided with a heat absorption ring channel (2); The interior of the heat absorption loop (2) is in close contact with the outer wall of the boiler furnace body (1); a reversing valve (5) is installed on the outer wall of the boiler furnace body (1); the outer wall of the reversing valve (5) is connected to a plurality of first air intake pipes (6); an air intake manifold (4) is installed on the side wall of the reversing valve (5); the air intake manifold (4) is distributed inside the heat absorption loop (2); a second air intake pipe (7) is installed at the other end of the air intake manifold (4) of the heat absorption loop (2); the second air intake pipe (7) is connected to the boiler furnace body (1); The reversing valve (5) is controlled by the furnace environment control system, thereby adjusting the operating state and valve opening of the reversing valve (5); The furnace environment control system includes a temperature detection unit, an air intake control unit, a fluctuation monitoring unit, a condition management unit and a comprehensive evaluation unit.

2. The dry distillation boiler for coke production based on furnace environment control according to claim 1, characterized in that: The reversing valve (5) is provided with two groups of gas outlets, one group being directly connected to the boiler body (1), and the other group being connected to the intake manifold (4). The two groups of gas outlets are switched and controlled by the reversing valve (5), thereby controlling the opening and closing conditions of the two groups of gas outlets of the reversing valve (5) and the valve opening distribution ratio.

3. The dry distillation boiler for coke production based on furnace environment control according to claim 1, characterized in that: The temperature detection unit is used to monitor the temperature inside the boiler furnace body (1) and obtain the temperature distribution inside the boiler furnace body (1); The air intake control unit is used to control the reversing valve (5) and correct the gas outlet direction of the reversing valve (5); The fluctuation monitoring unit obtains the temperature distribution through the temperature detection unit, and performs regional temperature fluctuation monitoring on the temperature distribution on the time axis; The condition management unit collects the gas atmosphere in the boiler furnace (1), performs standardized detection of the production atmosphere based on the collected gas atmosphere, and generates an air intake ratio control signal based on the monitoring result; The comprehensive evaluation unit performs statistics on the air intake process and the temperature fluctuation signal, performs a comprehensive evaluation based on all statistical results, and generates a production process stability evaluation result.

4. The dry distillation boiler for coke production based on furnace environment control according to claim 3, characterized in that: The temperature detection unit is configured by arranging high-temperature sensors at different positions inside the boiler furnace body (1), collecting the temperature inside the boiler furnace body (1) according to the high-temperature sensors, and recording the collected data as the initial temperature; A plurality of high-temperature sensors are arranged at equal intervals in a vertical direction of the boiler furnace body (1), and a plurality of high-temperature sensors are arranged at equal intervals in a circumferential direction at the bottom of the boiler furnace body (1).

5. The dry distillation boiler for coke production based on furnace environment control according to claim 4, characterized in that: The temperature detection unit compares the initial temperatures along the circumferential direction in pairs. If the difference between a group of initial temperatures and other initial temperatures is greater than a set value, the initial temperatures are deleted, otherwise they are retained. The temperature detection unit performs arithmetic averaging on the retained circumferential temperatures to obtain an average temperature, and uses the average temperature as the temperature data at the collection point at the bottom of the boiler; The temperature detection unit selects the initial temperature of the temperature collection point adjacent to the collection point at the bottom of the boiler in the vertical direction, calculates the difference between the two initial temperatures to obtain the interval temperature difference, compares the interval temperature difference with the set temperature difference threshold, and retains or deletes the initial temperature according to the comparison result.

6. The dry distillation boiler for coke production based on furnace environment control according to claim 3, characterized in that: The method for the fluctuation supervision unit to perform regional temperature fluctuation supervision is: The fluctuation monitoring unit divides the boiler body (1) into a plurality of regions with each temperature monitoring point in the vertical direction as the center, and the temperature in each region is recorded based on the initial temperature at the temperature monitoring point; Each time the fluctuation monitoring unit obtains the initial temperature, the fluctuation monitoring unit records the time of obtaining the initial temperature, thereby recording the initial temperature sequentially in the form of a time axis to obtain a temperature change sequence for each area. The fluctuation monitoring unit divides the adjacent initial temperature differences in the temperature change sequence by the interval time to obtain the temperature change speed for each area, and records the initial temperature difference as the temperature change amplitude.

7. The dry distillation boiler for coke production based on furnace environment control according to claim 3, characterized in that: The condition management unit records the collected gas atmosphere, obtains the component ratio corresponding to each gas, and compares the component ratio of each gas with the set range, and records the component ratio as a qualified ratio or an unqualified ratio according to the comparison result; The condition management unit records the unqualified proportions and adaptively adjusts the components of the unqualified proportions during air intake.

8. The dry distillation boiler for coke production based on furnace environment control according to claim 3, characterized in that: The air intake control unit obtains the temperature change speed and the temperature change amplitude, compares the temperature change speed and the temperature change amplitude with corresponding threshold values, and generates a temperature fluctuation signal or a temperature stability signal according to the comparison result. At the same time, the air intake control unit obtains the current air intake opening ratio of the reversing valve (5). If a temperature fluctuation signal is generated, the air intake opening ratio is adjusted to increase the flow ratio of the intake manifold (4).

9. The dry distillation boiler for coke production based on furnace environment control according to claim 3, characterized in that: The comprehensive evaluation unit will count the number of times the unqualified ratio is generated and the number of times the temperature fluctuation signal is generated, and record them as the total number of changes, and calculate the ratio of the total number of changes to the set number threshold to obtain the change ratio. If the change ratio is greater than the set threshold, a production instability signal is generated. If the change ratio is less than the set threshold, a production stability signal is generated to obtain a production process stability evaluation result.

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