Intelligent coal feeding system for boiler of heating device and working method thereof

Abstract

The application discloses a boiler intelligent coal feeding system for a heating device, which is characterized in that a nuclear scale is additionally arranged at the side head of a primary en masse scraper coal feeder, two air hammers are respectively welded at the cone portions on the two sides of each coal bin, and the boiler intelligent coal feeding system further comprises a coal quantity controller, the real-time voltage values of the two nuclear scales are externally connected to the coal feeder, and the voltage values of the nuclear scales on the two sides of the coal feeder under no load and under load are recorded; the voltage values are subjected to smooth correction processing to obtain stable nuclear scale voltages; according to the given calibration coefficient K0 and the calibration voltage U0, the nuclear scale voltage value signals measured under no load and under load of the en masse scraper coal feeder are subjected to logical judgment low alarm or high alarm, corresponding instruction actions are output to the air hammers or the primary coal feeder, and the coal feeding quantity is controlled by an instruction operation controller F. The application can continuously monitor the coal feeding condition of the boiler, timely find abnormalities and automatically process the abnormalities, and can greatly improve the stability of the boiler operation of the heating device.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of automation control, and particularly relates to a boiler intelligent coal feeding system for a heating device and a working method thereof. BACKGROUND

[0002] In the heating device using coal as fuel, stable feeding of fuel coal is crucial to stable operation of the boiler system. If fuel coal cannot be continuously and stably fed, a series of problems such as fluctuation of boiler temperature and load will occur, and even the boiler will be extinguished.

[0003] In the original design, each set of boiler is fed by two sets of coal feeders. Under normal circumstances, the two sets of systems are operated simultaneously to ensure uniform coal feeding, but each set of system can ensure continuous operation of the boiler at 100% load when the other set fails. The coal feeding amount is calculated by the speed of the primary coal feeder, and the actual coal feeding amount of the coal feeder cannot be reflected. In addition, the coal feeder metering is affected by many factors such as coal calorific value and boiler load, resulting in a large deviation between the calculated coal feeding amount and the actual coal feeding amount. When the fuel coal storage bin is bridged or the coal feeder is blocked, the operator cannot timely discover and timely handle it, and only when the boiler combustion temperature, the oxygen content at the furnace outlet, the steam pressure and flow appear large fluctuations can it be discovered, which seriously affects the safe and stable operation of the boiler.

[0004] Therefore, it is of great significance to develop a boiler coal feeding system that can timely identify and discover the problem of poor coal feeding of the fuel coal storage bin or blocking of the coal feeder, and automatically remedy and handle it, to ensure the stable operation of the boiler of the heating device and improve the steam quality. SUMMARY

[0005] The application aims to provide a boiler intelligent coal feeding system for a heating device and a working method thereof, which can intelligently identify abnormal problems such as poor coal feeding of the fuel coal storage bin, bridging or blocking of the coal feeder, and automatically remedy and handle the problems according to the problems, so as to ensure normal and stable feeding of fuel coal of the boiler when the above abnormal conditions occur, and ensure safe and stable operation of the boiler.

[0006] The first aspect of the embodiment of the application provides a boiler intelligent coal feeding system for a heating device, a nuclear scale is additionally arranged at a side head of a primary en masse coal feeder, two air hammers are respectively welded at the cone portions on both sides of each coal bunker, and the boiler intelligent coal feeding system further comprises a coal quantity controller FIC, the real-time voltage values of the two nuclear scales are externally connected to the coal feeder, and the voltage values of the nuclear scales on both sides of the coal feeder under no load and under load are recorded; the voltage values are subjected to smoothing correction processing to obtain stable nuclear scale voltages, according to the given calibration coefficient K0 and the calibration voltage U0, according to the nuclear scale voltage value signals measured under no load and under load of the en masse coal feeder, logical determination of low alarm or high alarm is performed, and corresponding instruction actions are output to the air hammers or the primary and secondary coal feeders, the coal quantity of the coal feeder is controlled by the instruction operation controller FIC, and a commissioning / cut-off switch FIC is further arranged for controlling the commissioning or disconnection of the system. 01_SW

[0007] The second aspect of the embodiment of the application provides a working method of a boiler intelligent coal feeding system for a heating device, and specifically comprises the following steps.

[0008] Step 1: the real-time voltage values of the nuclear scales on both sides of two coal feeders C 01A and C 01B are obtained, and the voltage values are recorded as UI 01A1 and UI 01B1 , the voltage values obtained after smoothing correction processing are recorded as UI 01A and UI 01B , the rotation speeds are recorded as SI 01A and SI 01B , and the air hammers are recorded as KQC

[0009] Step 2: the coal quantity formula is FI 01 = FI 01A + FI 01B

[0010]

[0011] Step 3: according to the nuclear scale voltage values measured under no load and under load of the en masse coal feeder C 01A / B , the high alarm of the nuclear scale voltage UI 01A / B of the coal feeder is set between the voltage under load and the voltage under no load according to the actual operation trend, and the low alarm of the nuclear scale voltage UI 01A / B of the coal feeder is set between 0 and the voltage under load.

[0012] Step 4: when the low alarm of UI 01A / B occurs, it indicates that the coal feeder on the alarm side is blocked, the chain is floating or there is sundry in the nuclear scale, and the process personnel timely check and process on site; when the high alarm of UI 01A / B occurs, it indicates that the coal feeder on the alarm side is broken.​

[0013] Furthermore, in step 4, the nuclear scale voltage UI of the coal feeder is defined 01A 、UI 01B High alarm action logic,

[0014] Coal feeder C 01A Voltage UI 01A High alarm, 5s delay, three action commands are issued:

[0015] 1) Coal feeder C 01A Controller FIC 01A Set to manual control and reduce the opening to 10%;

[0016] 2) Air hammer KQC 01A / 02A Action, vibrate the coal bunker, to UI 01A High alarm eliminated;

[0017] 3) Coal feeder C 01B Controller FIC 01B Set to manual control and increase the opening to FIC 01B 1.8 times the opening before coal failure, with a maximum of no more than 70%;

[0018] Coal feeder C 01B Voltage UI 01B High alarm, 5s delay, three action instructions occur simultaneously:

[0019] 1) Coal feeder C 01B Controller FIC 01B Set to manual control and reduce the opening to 10%;

[0020] 2) Air Hammer KQC 01B / 02B Action, vibrate the coal bunker, to UI 01B High alarm eliminated;

[0021] 3) Coal feeder C 01A Controller FIC 01A Set to manual control and increase the opening to FIC 01A 1.8 times the opening before coal failure, and no more than 70% at most.

[0022] Furthermore, in step 4, the voltage alarm action logic of the nuclear scales of the two coal feeders is as follows:

[0023] When the coal feeding system FIC 01_SW In the commissioning state, if the voltage of the nuclear scale of the coal feeder on one side is high within 5 seconds after the voltage of the nuclear scale of the coal feeder on the other side is also high, the controller FIC of the coal feeder on both sides will be automatically turned off after a delay of 5 seconds. 01A / B The boiler is set to manual control, but the opening remains unchanged, and a "boiler coal outage" alarm is issued to prompt the operator to take emergency measures for boiler coal outage.

[0024] Coal feeder C 01A Voltage UI 01A High alarm and coal feeder C 01B Voltage UI 01B When high alarm, delay 5s response, action instruction occurs as follows:

[0025] Coal feeder C 01A Controller FIC 01A Put manual control, coal feeder C 01B Controller FIC 01B Put manual control, issue "boiler coal off" alarm, air hammer KQC 01A / 02A Action, shake coal bunker, to UI 01A High alarm elimination, air hammer KQC 01B / 02B Action, shake coal bunker, to UI 01B High alarm elimination.

[0026] A third aspect of the embodiments of the present application provides a computer readable storage medium, the computer readable storage medium stores a computer program, the computer program is executed by a processor to realize the steps of the above method.

[0027] Compared with the prior art, the beneficial effects of the embodiments of the present application are that the boiler coal feeding system can continuously monitor the boiler coal feeding condition, timely discover abnormalities and automatically process, can greatly improve the stability of the boiler operation of the heating device, reduce the operation difficulty and operation amount of the heating device, has the characteristics of program intelligence, simple operation, accurate abnormality identification, timely processing and stable coal feeding amount. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The device structure schematic diagram provided by an embodiment of the present application;

[0029] Figure 2 The single-sided coal cut-off circuit diagram logic diagram provided by an embodiment of the present application;

[0030] Figure 3 The double-sided coal cut-off circuit diagram logic diagram provided by an embodiment of the present application;

[0031] Figure 4 The schematic diagram of the nuclear scale smoothing correction link provided by an embodiment of the present application. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0033] It is to be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0034] Figure 1 An equipment structure schematic diagram provided by an embodiment of the present application is shown, only parts related to the embodiment are shown for the convenience of description, and the details are as follows:

[0035] A boiler intelligent coal feeding system for a heating device, a nuclear scale is additionally arranged at a side head of a primary en masse scraper coal feeder, two air hammers are respectively welded at the cone portions on both sides of each coal bunker, and the system further comprises a coal quantity controller FIC, characterized in that the real-time voltage values of the two nuclear scales are externally connected to the coal feeder, and the voltage values of the nuclear scales on both sides of the coal feeder under no load and under load are recorded; the voltage values are subjected to smoothing correction processing, and the coal quantity controller FIC controls the coal quantity according to the corresponding instruction actions of the air hammers or the primary and secondary coal feeders outputted according to the logic judgment low alarm or high alarm of the nuclear scale voltage value signals of the en masse scraper coal feeder under no load and under load. Figure 4 A nuclear scale smoothing correction link schematic diagram provided by an embodiment of the present application is shown, stable nuclear scale voltage is obtained, according to the given calibration coefficient K0 and calibration voltage U0, the logic judgment low alarm or high alarm is performed according to the measured nuclear scale voltage value signals of the en masse scraper coal feeder under no load and under load, the corresponding instruction actions are outputted to the air hammers or the primary and secondary coal feeders, the coal quantity is controlled by the instruction operation controller FIC, and a commissioning / cut-off switch FIC is further arranged. 01 SW for the control commissioning or disconnection of the system. An externally connected numerical control display board PV, OP, SP

[0036] The air hammer is controlled by the factory air pressure, the air intake amount is controlled by the electromagnetic valve, the air hammer knocks the bunker body to produce resonance, and thus the arch breaking effect is achieved.

[0037] Among them, the coal feeder is recorded as C, the air hammer is recorded as KQC, the speed is recorded as S, and the flow is recorded as F. The indication function is recorded as I, the control function is recorded as C, the indication and control function is recorded as IC, the nuclear scale voltage is recorded as UI, for example: the controller with flow indication and control function is recorded as FIC. 01 indicates the same primary coal feeding, 02 indicates the secondary coal feeding system, and A and B are used to distinguish the same equipment on different sides.

[0038] The present application further provides a working method of a boiler intelligent coal feeding system for a heating device, and specifically comprises the following steps:

[0039] Step 1: the real-time voltage values UI 01A and UI 01B of the nuclear scales on both sides of the two coal feeders C 01A1 and C01B1 After smoothing and correction, the voltage value is recorded as UI 01A 、UI 01B ; Speed ​​is recorded as SI 01A ;SI 01B , air hammer is marked as KQC,

[0040] Step 2: Calculate the coal quantity using the formula FI 01 =FI 01A +FI 01B

[0041]

[0042] FI01A=54.3*Ln(0.92 / 0.43)*0.038=4.21t / h

[0043] FI01B=32*Ln(0.74 / 0.24)*0.038=4.64t / h

[0044] FI01=FI01A+FI01B=4.21+4.64=8.85t / h

[0045] Step 3: Based on the measured scraper feeder C 01A / B The nuclear scale voltage value at no-load and load is between the voltage at load and the voltage at no-load. The nuclear scale voltage UI of the coal feeder is reasonably set based on the actual operating trend. 01A / B High alarm; reasonably set the coal feeder nuclear scale voltage UI between 0 and the voltage under load 01A / B Low alarm; the voltage deviation of each coal feeder nuclear scale is large due to its own attenuation degree and the thickness of the coal feeder bottom plate due to wear and tear.

[0046] Step 4: When UI 01A / B When a low alarm occurs, it means that the coal feeder on the alarm side is blocked by coal, or there are debris in the floating chain or nuclear scale. The process personnel should go to the site to check and deal with it in time. 01A / B When a high alarm occurs, it means that the coal feeder on the alarm side is out of coal.

[0047] Figure 2 The logic diagram of the single-side coal-breaking circuit provided by an embodiment of the present application is shown, defining the nuclear scale voltage UI of the coal feeder 01A 、UI 01B High alarm action logic,

[0048] Coal feeder C 01A Voltage UI 01A High alarm, 5s delay, issues three action commands:

[0049] 1) Coal feeder C 01A Controller FIC01A Put the manual control, the opening degree to 10%;

[0050] 2) Air hammer KQC 01A / 02A Action, shake the coal bunker, to UI 01A High alarm elimination;

[0051] 3) Coal feeder C 01B Controller FIC 01B Put the manual control, the opening degree to FIC 01B 1.8 times the opening degree before the coal is broken, the highest does not exceed 70%;

[0052] Coal feeder C 01B Voltage UI 01B High alarm, delay 5s, three action instructions occur at the same time:

[0053] 4) Coal feeder C 01B Controller FIC 01B Put the manual control, the opening degree to 10%;

[0054] 5) Air hammer KQC 01B / 02B Action, shake the coal bunker, to UI 01B High alarm elimination;

[0055] 6) Coal feeder C 01A Controller FIC 01A Put the manual control, the opening degree to FIC 01A 1.8 times the opening degree before the coal is broken, the highest does not exceed 70%.

[0056] Figure 3 The double-sided coal breaking circuit diagram logic diagram provided for an embodiment of the application;

[0057] When the coal feeding system FIC 01_SW In the state of use, when the high alarm of the nuclear scale voltage of the coal feeder on one side occurs within 5s and the high alarm of the nuclear scale voltage of the coal feeder on the other side also occurs, delay 5s and then automatically put the controllers FIC 01A / B of the two coal feeders into manual control, but the opening degree remains unchanged, and issue a "boiler coal breaking" alarm to prompt the operator to carry out emergency disposal of boiler coal breaking.

[0058] Coal feeder C 01A Voltage UI 01A High alarm and coal feeder C 01B Voltage UI 01B When the high alarm, delay 5s reaction, action instructions occur as follows:

[0059] Coal feeder C 01A Controller FIC 01A Put the manual control, coal feeder C 01B Controller FIC01B Manual control, send "boiler coal off" alarm, air hammer KQC 01A / 02A Action, shake the coal bunker, to UI 01A High alarm elimination, air hammer KQC 01B / 02B Action, shake the coal bunker, to UI 01B High alarm elimination.

[0060] Set a boiler intelligent coal feeding system commissioning, cut-off switch FIC 01 SW , the operator can click "commissioning" or "bypass" to realize the commissioning or cut-off of the intelligent coal feeding system. When in "commissioning" state, the coal feeder coal off automatic adjustment setting works; when in "bypass" state, it does not work.

[0061] During the shutdown of the boiler, install and debug the coal feeder nuclear scale and the accuracy of the action of the control logic.

[0062] When the boiler is running, start the operation of the two coal feeders, and after confirming that the boiler coal feeding system is running normally, commission the boiler intelligent coal feeding system FIC 01 SW .

[0063] When the nuclear scale fails or other conditions do not require intelligent coal feeding, the operator can click the drop-down arrow of the intelligent coal feeding system FIC 01_SW to select "bypass" or "commissioning" to complete the cut-off and commissioning process of the intelligent coal feeding system.

[0064] In the whole system, PLC controller can be used for electrical control, integrated into the control cabinet to realize automatic control, or connected to the system for information management.

[0065] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above-mentioned division of each functional unit and module is exemplified, and in actual application, the above-mentioned functions can be completed by different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or software. In addition, the specific name of each functional unit and module is only for easy distinction, and does not limit the protection scope of the present application. The specific working process of the unit and module in the above system can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

[0066] In the above embodiments, the description of each embodiment has its own focus, and the parts not described or recorded in a certain embodiment can be referred to the relevant description of other embodiments.

[0067] Those skilled in the art can understand that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. A person skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0068] In the embodiments provided in the present application, it should be understood that the disclosed apparatus / terminal device and method can be implemented by other ways. For example, the apparatus / terminal device embodiments described above are only schematic, and the division of the modules or units is only a logical function division, and there can be another division way in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections between the units can be indirect couplings or communication connections through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0069] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the present embodiment.

[0070] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0071] The integrated module / unit, if implemented in the form of a software functional unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, all or part of the processes in the above-mentioned embodiment methods can also be completed by a computer program instructing related hardware, and the computer program can be stored in a computer readable storage medium. The computer program can implement the steps of each method embodiment when executed by a processor. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or some intermediate forms. The computer readable medium can include any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the contents included in the computer readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction, for example, in some jurisdictions, according to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.

[0072] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A working method for a boiler intelligent coal feeding system of a heating device, the boiler intelligent coal feeding system of the heating device comprising a nuclear scale added at a side head of a primary en masse coal feeder, two air hammers respectively welded at a conical part on both sides of each coal bunker, and a coal quantity controller, characterized in that, Two said nuclear scale real-time voltage values are externally connected to the coal feeder, and the nuclear scale voltage values on both sides of the coal feeder under no-load and with load are recorded; the voltage values are smoothed and corrected to obtain stable nuclear scale voltage; according to the given calibration coefficient and calibration voltage, the nuclear scale voltage value signals of the measured plough-type coal feeder under no-load and with load are logically judged to give low or high alarm, and corresponding instruction actions are output to the air hammer or the primary coal feeder to control the coal supply amount of the coal feeder by the instruction operation controller; a commissioning / cut-off switch is further arranged to control the commissioning or disconnection of the system. Specifically, the method comprises the following steps: Step 1: two coal feeders are noted as C 01A and C 01B， The nuclear side of the real-time acquisition voltage value is noted as UI 01A1 , UI 01B1 ; After smoothing correction processing, the voltage value is noted as UI 01A , UI 01B ; The speed is noted as SI 01A , SI 01B ; The air hammer is noted as KQC; Step 2: Calculate the coal quantity formula as FI 01 = FI 01A + FI 01B ; ； ； Step 3: According to the measured buried scraper coal feeder C 01A / B The nuclear weighing voltage value at no load and load, the voltage at load and the voltage at no load, the actual operation trend, and the reasonable setting of the coal feeder nuclear weighing voltage UI 01A / B High alarm; the reasonable setting of the coal feeder nuclear weighing voltage UI between 0 and the voltage at load 01A / B Low alarm; Step 4: When the UI 01A / B appears low alarm, it indicates that the coal feeder on the alarm side is blocked, the chain is floating or there is a foreign matter in the nuclear scale. The process personnel timely check and handle the site; when the UI 01A / B appears high alarm, it indicates that the coal feeder on the alarm side is broken. In Step 4, the nuclear scale voltage UI to the coal feeder is defined 01A , UI 01B High alarm action logic, Coal feeder C 01A Voltage UI 01A High alarm, delay 5 s, three action commands 1) coal feeder C 01A controller FIC 01A manual control, opening reduced to 10% 2) Air hammer KQC 01A / 02A Action, rattle bunker, to UI 01A High alarm cancellation; 3) coal feeder C 01B controller FIC 01B manual control, opening increased to FIC 01B 1.8 times the opening before coal is cut off, not more than 70% Coal feeder C 01B Voltage UI 01B High alarm, delay 5 s, three action commands simultaneously: 1) coal feeder C 01B controller FIC 01B manual control, opening reduced to 10% 2) Air hammer KQC 01B / 02B Action, rattle bunker, to UI 01B High alarm cancellation; 3) coal feeder C 01A controller FIC 01A manual control, opening increased to FIC 01A 1.8 times the opening before coal is cut off, not more than 70% In step 4, the voltage of the nuclear scale of both coal feeders is alarm action logic: When the coal feeding system FIC 01_SW In the state of operation, when the nuclear scale voltage of one side coal feeder appears high alarm within 5 seconds, and the nuclear scale voltage of the other side coal feeder also appears high alarm, after 5 seconds delay, the controller FIC 01A / B of both sides of coal feeder is automatically set to manual control, but the opening degree remains unchanged, and the "boiler coal off" alarm is issued to prompt the operator to carry out emergency disposal of boiler coal off. Coal feeder C 01A Voltage UI 01A High alarm and coal feeder C 01B Voltage UI 01B When the high alarm is delayed for 5 seconds, the reaction is as follows: Coal feeder C 01A Controller FIC 01A Manual control, coal feeder C01B Controller FIC 01B Manual control, "boiler coal off" alarm issued, Air hammer KQC 01A / 02A Action, rattle bunker, to UI 01A High alarm cancellation. Air hammer KQC 01B / 02B Action, rattle bunker, to UI 01B High alarm cancellation.

2. A computer-readable storage medium storing a computer program, the computer-readable storage medium comprising instructions that, when executed by a computer, cause the computer to perform operations comprising: The computer program is executed by the processor to realize the steps of the method of claim 1.

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