Automatic control device for pulverized coal conveying

Abstract

The utility model discloses an automatic control device for pulverized coal conveying, which relates to the technical field of automatic temperature control devices and comprises an upper bin and a bottom bin, a first drain valve, a second drain valve, a third drain valve and a twelfth drain valve are respectively arranged between the upper bin and the bottom bin, and a coal bin top is arranged at the top of the bottom bin. The sensors are arranged on the balance pipe, the coal bunker and the nitrogen pipeline and used for monitoring the pressure difference of the balance pipe, the temperature of the pulverized coal bunker, the material level, the nitrogen pressure and the like; the valves are installed at different coal bunker joints, a balance pipe pipeline and a high-pressure nitrogen conveying pipeline respectively and used for achieving the goals of coal unloading, pressurizing, pressure relief, pulverized coal bunker pressure stabilization and the like, the pulverized coal conveying sequential control system is implemented on two sets of pulverized coal conveying equipment, good effects are achieved, the two sets of sequential control systems can give consideration to the conditions of the opposite sequential control system during operation, and the control efficiency is improved. The method can be used quickly and smoothly after being cut off, and the jump step sequence is judged accurately after the method is used.

Description

Technical Field

[0001] This utility model relates to the technical field of automatic temperature control devices, and in particular to an automatic control device for conveying pulverized coal. Background Technology

[0002] The existing coal powder conveying equipment and systems are combined to form a coal powder conveying sequential control system in a hardware and software combination manner. This system enables automatic control of the coal powder conveying equipment and performs some complex calculations, which helps to reduce the labor load of operators and achieve a more accurate ratio of bituminous coal to anthracite.

[0003] The existing DCS sequential control program, combined with field equipment, still imposes a significant workload on operators. Operators need to monitor the operating conditions of multiple devices simultaneously, which carries a risk of delayed operation. Directly modifying the DCS can easily affect operating conditions and thus production. Furthermore, modifications are inconvenient and difficult to perform complex calculations. In addition, modifying the DCS sequential control requires a certain investment of manpower and resources. These shortcomings limit the further optimization of the existing sequential control program. Utility Model Content

[0004] The purpose of this utility model is to provide an automatic control device for pulverized coal conveying, in order to solve the problems of the existing DCS sequential control program, which, when combined with field equipment for sequential control, still results in a heavy workload for operators. Operators need to monitor the operating conditions of multiple devices simultaneously, which carries the risk of untimely operation. Directly modifying the DCS can easily affect the operating conditions and thus production, and the modification is inconvenient and difficult to perform complex calculations. In addition, modifying the DCS sequential control requires a certain investment of manpower and resources. The above-mentioned defects limit the further optimization of the existing sequential control program.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an automatic control device for conveying pulverized coal, comprising an upper silo and a lower silo, wherein a first drain valve, a second drain valve, a third drain valve, and a twelfth drain valve are respectively provided between the upper silo and the lower silo; a coal bunker roof is provided on the top of the lower silo, and a water supply pipe is connected above the coal bunker roof; a balancing pipe is provided on the side of the water supply pipe, and a sequence control module is provided at the other end of the balancing pipe; an eleventh drain valve, a fourth drain valve, a seventh drain valve, an eighth drain valve, and a ninth drain valve are respectively provided on the side of the water supply pipe between the lower silo and the upper silo; a second water supply pipe is provided on the right side of the middle part of the upper silo of the lower silo, and a tenth drain valve and a thirteenth drain valve are respectively provided on the side of the second water supply pipe; sensors are installed on the balancing pipe, the coal bunker, and the nitrogen pipeline to monitor the pressure difference of the balancing pipe, the temperature of the pulverized coal bunker, the material level, and the nitrogen pressure. The valves are installed at the connection points of different coal bunkers, on the balance pipeline, and on the high-pressure nitrogen delivery pipeline to achieve the goals of unloading coal, pressurizing, depressurizing, and stabilizing the pressure of the pulverized coal bunker. The pulverized coal conveying sequential control system is implemented on two sets of pulverized coal conveying equipment, and both have achieved good results. During the operation of the two sequential control systems, the situation of the other sequential control system can be taken into account. After being cut off, it can often be put back into operation smoothly and quickly. After being put into operation, the jump sequence judgment is accurate. The operators in the central control room have reduced the frequency of manual operation of each switch valve and regulating valve. They can directly view and record the pulverized coal filling amount on the DCS screen, which reduces the workload and improves the automation rate of the equipment. The sequential control program is on an advanced control platform, which is conducive to subsequent optimization, reduces the risk of directly modifying the DCS, and facilitates the implementation of ideas. If the sequential control program fails, it can be automatically cut off without affecting the calculation of the pulverized coal filling amount, thus balancing safety and convenience.

[0006] As a preferred embodiment of this utility model, the side of the water supply pipe is provided with a fifth drain valve and a sixth drain valve.

[0007] As a preferred embodiment of this utility model, a pressurization valve is provided between the side of the balance tube and the sequence control module.

[0008] As a preferred technical solution of this utility model, the bottom of the upper silo is provided with a coal bunker bottom, and the bottom of the coal bunker bottom is connected to the water supply pipe.

[0009] As a preferred technical solution of this utility model, the side of the water supply pipe is provided with a pressure valve located on the side of the eighth drain valve.

[0010] As a preferred technical solution of this utility model, a second pressurization valve is provided on the side of the bottom compartment.

[0011] As a preferred technical solution of this utility model, three water supply pipes are provided on the right side of the tenth and thirteenth drain valves. After the coal powder conveying sequential control system is put into use, the operator can be freed from the labor of operating the coal powder conveying valves 1,000 times a day. The operator can directly view and record the coal powder filling amount on the DCS screen, which improves the automation rate of the device and reduces the labor load. The new sequential control system can realize complex calculations of coal powder conveying equipment data, reduce the risk of directly modifying the DCS, and facilitate subsequent optimization. If the sequential control program fails, it can be automatically cut off without affecting the calculation of coal powder filling amount, taking into account both safety and convenience. At present, the coal powder conveying sequential control system is running stably and rarely cuts off.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This invention uses sensors installed in the balance pipe, coal bunker, and nitrogen pipeline to monitor the differential pressure in the balance pipe, the temperature of the pulverized coal bunker, the material level, and the nitrogen pressure. Valves are installed at the connection points of different coal bunkers, in the balance pipe, and in the high-pressure nitrogen delivery pipeline to achieve coal unloading, pressurization, depressurization, and stabilization of the pulverized coal bunker pressure. The pulverized coal conveying sequential control system has been implemented on two sets of pulverized coal conveying equipment, achieving good results in both. During the operation of the two sequential control systems, the situation of the other sequential control system can be taken into account. After disconnection, it can often be put back into operation smoothly and quickly. After being put back into operation, the jump sequence judgment is accurate. The operators in the central control room reduce the frequency of manual operation of various switching valves and regulating valves. They can directly view and record the pulverized coal filling amount on the DCS screen, reducing the workload and improving the automation rate of the equipment. The sequential control program is based on an advanced control platform, which is conducive to subsequent optimization, reduces the risk of directly modifying the DCS, and facilitates the implementation of ideas. If the sequential control program fails, it can be automatically disconnected without affecting the calculation of the pulverized coal filling amount, balancing safety and convenience.

[0014] After the coal powder conveying sequential control system was put into use, operators were freed from the labor of operating the coal powder conveying valves 1,000 times a day. They can directly view and record the coal powder filling amount on the DCS screen, which improves the automation rate of the equipment and reduces the labor load. The new sequential control system can realize complex calculations of coal powder conveying equipment data, reduce the risk of directly modifying the DCS, and facilitate subsequent optimization. If the sequential control program fails, it can be automatically cut off without affecting the calculation of coal powder filling amount, thus balancing safety and convenience. Currently, the coal powder conveying sequential control system is operating stably and rarely needs to be cut off. Attached Figure Description

[0015] Figure 1 This is a structural installation diagram of the present invention;

[0016] Figure 2 This is a partial installation diagram of the structure of this utility model;

[0017] Figure 3 This is a structural signal processing system diagram of the present invention;

[0018] Figure 4 This is a structural signal connection diagram of the present invention.

[0019] In the diagram: 1. First drain valve; 2. Second drain valve; 3. Third drain valve; 4. Water supply pipe one; 5. Fourth drain valve; 6. Fifth drain valve; 7. Sixth drain valve; 8. Seventh drain valve; 9. Eighth drain valve; 10. Ninth drain valve; 11. Coal bunker bottom; 12. Balance pipe; 13. Pressurization valve one; 14. Pressurization valve two; 15. Pressurization valve three; 16. Sequence control module; 17. Upper bunker; 18. Coal bunker top; 19. Bottom bunker; 20. Tenth drain valve; 21. Water supply pipe two; 22. Eleventh drain valve; 23. Twelfth drain valve; 24. Thirteenth drain valve. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-4This utility model provides an automatic control device for coal powder conveying, including an upper silo 17 and a lower silo 19. A first drain valve 1, a second drain valve 2, a third drain valve 3, and a twelfth drain valve 23 are respectively installed between the upper silo 17 and the lower silo 19. A coal bunker top 18 is located at the top of the lower silo 19, and a water supply pipe 4 is connected above the coal bunker top 18. A balance pipe 12 is installed on the side of the water supply pipe 4, and a sequence control module 16 is installed at the other end of the balance pipe 12. An eleventh drain valve 22, a fourth drain valve 5, a seventh drain valve 8, an eighth drain valve 9, and a ninth drain valve 10 are respectively installed on the side of the water supply pipe 4 between the lower silo 19 and the upper silo 17. A second water supply pipe 21 is located on the right side of the middle of the upper silo 17 of the lower silo 19. A tenth drain valve 20 and a thirteenth drain valve 24 are respectively installed on the side of the second water supply pipe 21. Sensors are installed on the balance pipe 12, the coal bunker, and the nitrogen pipeline to monitor the pressure difference of the balance pipe 12. The coal powder silo temperature, material level, and nitrogen pressure are monitored. Valves are installed at the connection points of different coal silos, on the balance pipe 12, and on the high-pressure nitrogen delivery pipeline. These systems are used to achieve coal unloading, pressurization, depressurization, and stabilization of coal powder silo pressure. The coal powder conveying sequential control system is implemented on two sets of coal powder conveying equipment, achieving good results. During operation, both systems can take into account the situation of the other system. After disconnection, the system can often be quickly and smoothly put back into operation. After being put back into operation, the jump sequence judgment is accurate. The operators in the central control room have reduced the frequency of manual operation of various switching valves and regulating valves. They can directly view and record the coal powder filling amount on the DCS screen, reducing the workload and improving the automation rate of the equipment. The sequential control program is on an advanced control platform, which is conducive to subsequent optimization, reduces the risk of directly modifying the DCS, and facilitates the implementation of ideas. If the sequential control program fails, it can be automatically disconnected without affecting the calculation of the coal powder filling amount, balancing safety and convenience.

[0022] The side of the water supply pipe 14 is provided with a fifth drain valve 6 and a sixth drain valve 7, and the side of the balance pipe 12 is provided with a pressurization valve 3 15 between it and the sequence control module 16.

[0023] The bottom of the upper silo 17 is equipped with a coal bunker bottom 11, which is connected to the bottom of the water supply pipe 4. The side of the water supply pipe 4 is equipped with a pressure valve 13 located on the side of the eighth drain valve 9. The side of the bottom silo 19 is equipped with a pressure valve 14. Three water supply pipes 21 are set on the right side of the tenth drain valve 20 and the thirteenth drain valve 24. After the coal powder conveying sequential control system is put into use, the operator can be freed from the labor of operating the coal powder conveying valve 1,000 times a day. The coal powder filling amount can be directly viewed and recorded on the DCS screen, which improves the automation rate of the equipment and reduces the labor load. The new sequential control system can realize complex calculations of coal powder conveying equipment data, reduce the risk of directly modifying the DCS, and facilitate subsequent optimization. If the sequential control program fails, it can be automatically cut off without affecting the calculation of coal powder filling amount, taking into account both safety and convenience. At present, the coal powder conveying sequential control system is operating stably and rarely cuts off.

[0024] In practical use, firstly, the raw signals from sensors and valves, including the differential pressure of the balance pipe 12, the pressure of the pulverized coal silo, and the temperature of the pulverized coal silo, are sent to the sequence control module 16 via the communication module. The silo weight is also sent to the data processing module via the communication module. The data processing module processes the silo weight and temperature signals sent from the communication module and provides the results to the sequence control module 16 and the communication module. The sequence control module 16 is then manually activated. During operation, the coal feeding sequence control program is designed with four stages based on the process characteristics, executing sequentially in a loop: A. Coal unloading: Pulverized coal is unloaded from the middle silo into the lower silo. The unloading is completed based on the differential pressure, pulverized coal silo temperature changes, and level gauge readings. B. Pressure depressurization: The pressure in the middle silo is depressurized in two stages. The pressure depressurization is completed based on the differential pressure. C. Coal discharge: Pulverized coal is discharged from the upper silo 17 into the middle silo. The discharge is completed based on the pulverized coal silo weight. Coal cutting is completed; D. Pressurization: Pressurize the middle silo. During pressurization, adjust the opening of the pressurization valve and the opening and closing of each air filling valve in stages. The pressurization is completed based on the pressure and pressure difference. The coal powder conveying sequential control system is implemented on two sets of coal powder conveying equipment and has achieved good results. During the operation of the two sequential control systems, the situation of the opposite sequential control system can be taken into account. After being cut off, it can often be put back into operation smoothly and quickly. After being put into operation, the jump sequence judgment is accurate. The operators in the central control room have reduced the frequency of manual operation of each switch valve and regulating valve. They can directly view and record the coal powder filling amount on the DCS screen, which reduces the workload and improves the automation rate of the equipment. The sequential control program is on an advanced control platform, which is conducive to subsequent optimization, reduces the risk of directly modifying the DCS, and facilitates the implementation of ideas. If the sequential control program fails, it can be automatically cut off without affecting the calculation of the coal powder filling amount, taking into account both safety and convenience.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic control device for conveying pulverized coal, comprising an upper silo (17) and a lower silo (19), characterized in that: The upper chamber (17) and the lower chamber (19) are respectively provided with a first drain valve (1), a second drain valve (2), a third drain valve (3) and a twelfth drain valve (23). The bottom chamber (19) is provided with a coal bunker roof (18). A water supply pipe (4) is connected above the coal bunker roof (18). A balance pipe (12) is provided on the side of the water supply pipe (4). A sequence control module (16) is provided at the other end of the balance pipe (12). The side of the water supply pipe (4) between the lower chamber (19) and the upper chamber (17) is respectively provided with an eleventh drain valve (22), a fourth drain valve (5), a seventh drain valve (8), an eighth drain valve (9) and a ninth drain valve (10). A second water supply pipe (21) is provided on the right side of the middle part of the lower chamber (19) and the upper chamber (17). The side of the second water supply pipe (21) is respectively provided with a tenth drain valve (20) and a thirteenth drain valve (24).

2. The automatic control device for conveying pulverized coal according to claim 1, characterized in that: The side of the water pipe (4) is provided with a fifth drain valve (6) and a sixth drain valve (7).

3. The automatic control device for conveying pulverized coal according to claim 1, characterized in that: A pressurization valve three (15) is provided between the side of the balance tube (12) and the sequence control module (16).

4. The automatic control device for conveying pulverized coal according to claim 1, characterized in that: The bottom of the upper silo (17) is provided with a coal bunker bottom (11), and the bottom of the coal bunker bottom (11) is connected to the water supply pipe (4).

5. The automatic control device for conveying pulverized coal according to claim 1, characterized in that: The side of the water pipe is provided with a pressure valve (13) located on the side of the eighth drain valve (9).

6. The automatic control device for conveying pulverized coal according to claim 1, characterized in that: The bottom compartment (19) is provided with a pressure valve two (14) on its side.

7. The automatic control device for conveying pulverized coal according to claim 1, characterized in that: Three water supply pipes (21) are provided on the right side of the tenth drain valve (20) and the thirteenth drain valve (24).

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