An automatic switching system and method for an igcc unit coal screw conveyor

Abstract

The application discloses an automatic switching system and method for a pulverized coal screw conveyor of an IGCC unit, and belongs to the technical field of coal powder distribution. The system comprises a first coal grinding conveying device, a second coal grinding conveying device, a third coal grinding conveying device and a fourth conveyor. The first coal grinding conveying device comprises a first filter, a first conveyor and a first pulverized coal storage tank. The first filter is connected with the first conveyor and the fourth conveyor through a first three-way valve respectively, and the first conveyor is connected with the first pulverized coal storage tank. A second filter is connected with a second conveyor and the fourth conveyor through a second three-way valve respectively, and the second conveyor is connected with a second pulverized coal storage tank. A third filter is connected with a third conveyor and the fourth conveyor through a third three-way valve respectively, and the third conveyor is connected with a third pulverized coal storage tank. The application can effectively avoid the occurrence of personal injury and equipment damage caused by the failure of workers to find and operate in time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal powder distribution, in particular to an automatic switching system and method for a pulverized coal screw conveyor of an IGCC unit. BACKGROUND

[0002] IGCC (Integrated Gasification Combined Cycle) is an advanced power system combining coal gasification technology and high-efficiency combined cycle. IGCC is composed of two parts, namely, the coal gasification and purification part and the gas-steam combined cycle power generation part. The main equipment of the first part includes a gasifier, an air separation device, and coal gas purification equipment; the main equipment of the second part includes a gas turbine power generation system, a waste heat boiler, and a steam turbine power generation system.

[0003] Among them, in the gasifier, in order to maintain the stability of the flame and achieve the purpose of controllable flame, the conveying of the coal powder in the pipeline is particularly important. Due to the different characteristics of coal powder particles from solids, gases and liquids, affected by humidity and adhesion, combined with the fluctuation of the conveying gas pressure, the flow condition of the conveyed coal powder is unstable, which easily causes the failure of the conveyor and makes the coal powder unable to reach the gasifier in time.

[0004] After the failure of the conveyor, manual switching of the conveyor is required, which is not conducive to the personal safety of the operating personnel. If the operating personnel do not notice the failure of the conveyor in time, the switching is not timely, which easily causes equipment damage, excessive accumulation of coal powder, and safety production accidents. SUMMARY

[0005] In view of the problem in the prior art that if the switching is not timely after the failure of the conveyor, equipment damage, excessive accumulation of coal powder, and safety production accidents easily occur, the present application provides an automatic switching system for a pulverized coal screw conveyor of an IGCC unit, which can effectively avoid personal injury and equipment damage caused by the failure of the operating personnel to discover and operate in time.

[0006] In view of the problems in the prior art, the present application provides the following technical solutions:

[0007] An automatic switching system for IGCC unit pulverized coal screw conveyor, comprising a first coal grinding conveying device, a second coal grinding conveying device, a third coal grinding conveying device and a fourth conveyor; the first coal grinding conveying device comprises a first filter, a first conveyor and a first pulverized coal storage tank; the first filter is connected with the first conveyor and the fourth conveyor through a first three-way valve respectively, and the first conveyor is connected with the first pulverized coal storage tank; the second filter is connected with the second conveyor and the fourth conveyor through a second three-way valve respectively, and the second conveyor is connected with the second pulverized coal storage tank; the third filter is connected with the third conveyor and the fourth conveyor through a third three-way valve respectively, and the third conveyor is connected with the third pulverized coal storage tank; and the fourth conveyor is connected with the first pulverized coal storage tank, the second pulverized coal storage tank and the third pulverized coal storage tank.

[0008] As a further improvement of the present application, the outlet of the first filter is connected with the inlet of a first feeder, and the outlet of the first feeder is connected with a first valve port of the first three-way valve.

[0009] As a further improvement of the present application, the outlet of the second filter is connected with the inlet of a second feeder, and the outlet of the second feeder is connected with a second valve port of the second three-way valve.

[0010] As a further improvement of the present application, the outlet of the third filter is connected with the inlet of a third feeder, and the outlet of the third feeder is connected with a third valve port of the third three-way valve.

[0011] As a further improvement of the present application, the second valve port of the first three-way valve is connected with the first conveyor, and the third valve port of the first three-way valve is connected with the fourth conveyor.

[0012] As a further improvement of the present application, the second valve port of the first three-way valve is connected with the first conveyor, and the third valve port of the first three-way valve is connected with the fourth conveyor.

[0013] As a further improvement of the present application, a first plug valve is arranged between the fourth conveyor and the first conveyor.

[0014] As a further improvement of the present application, a second plug valve is arranged between the fourth conveyor and the second conveyor.

[0015] As a further improvement of the present application, a third plug valve is arranged between the fourth conveyor and the third conveyor.

[0016] An automatic switching method for IGCC unit pulverized coal screw conveyor, comprising:

[0017] When the first, second, and third coal mill conveying devices are in operation, the first filter sends pulverized coal into the first conveyor through the first three-way valve, and the first conveyor sends the pulverized coal into the first pulverized coal storage tank; the second filter sends pulverized coal into the second conveyor through the second three-way valve, and the second conveyor sends the pulverized coal into the second pulverized coal storage tank; the third filter sends pulverized coal into the third conveyor through the third three-way valve, and the third conveyor sends the pulverized coal into the third pulverized coal storage tank; if any of the first, second, or third conveyors malfunctions, the corresponding filter will send the pulverized coal to the fourth conveyor through the three-way valve, the fourth conveyor will send the pulverized coal to the malfunctioning conveyor, and the malfunctioning conveyor will send the pulverized coal into the corresponding pulverized coal storage tank.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This invention discloses an automatic switching system for pulverized coal screw conveyors in an IGCC (Integrated Gasification Cylinder Conveyor) unit. A first and third pulverized coal conveying device supplies pulverized coal to the first-stage burners of the gasifier in the IGCC unit, while a second pulverized coal conveying device supplies pulverized coal to the second-stage burners of the gasifier. The first pulverized coal storage tank 16 in the first pulverized coal conveying device and the third pulverized coal storage tank 36 in the third pulverized coal conveying device consume pulverized coal relatively quickly and require frequent replenishment. The second pulverized coal storage tank 26 in the second pulverized coal conveying device consumes less pulverized coal. During normal operation, the pulverizing unit operates in a two-in-one-standby mode. The first conveyor 15, second conveyor 26, and third conveyor 36 correspond one-to-one with the first pulverized coal storage tank 16, second pulverized coal storage tank 26, and third pulverized coal storage tank 36. A fourth conveyor 4 can transport pulverized coal from any filter to any pulverized coal storage tank. If any conveyor in this system malfunctions, it will not affect the supply of pulverized coal to the gasifier. Moreover, the system is highly automated and does not require manual switching of conveyors. Operators only need to select which conveyor to switch on based on the current system status, and the rest of the steps will be executed automatically. This can effectively prevent personal injury and equipment damage caused by untimely detection or operation by operators. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an automatic switching system for a pulverized coal screw conveyor in an IGCC unit according to the present invention;

[0021] Figure 2 This is a logic diagram of the first filter of the present invention feeding pulverized coal into the first pulverized coal storage tank;

[0022] Figure 3 This is a logic diagram for the operation of the first and second coal milling and conveying devices and the standby operation of the third coal milling and conveying device in this invention.

[0023] In the figure: 11 is a first filter; 12 is a first feeder; 13 is a first three-way valve; 131 is a first valve port; 132 is a second valve port; 133 is a third valve port; 14 is a first gate valve; 15 is a first conveyor; 16 is a first pulverized coal storage tank; 21 is a second filter; 22 is a second feeder; 23 is a second three-way valve; 231 is a twenty-first valve port; 232 is a twenty-second valve port; 233 is a twenty-third valve port; 24 is a second gate valve; 25 is a second conveyor; 26 is a second pulverized coal storage tank; 31 is a third filter; 32 is a third feeder; 33 is a third three-way valve; 331 is a thirty-first valve port; 332 is a thirty-second valve port; 333 is a thirty-third valve port; 34 is a third gate valve; 35 is a third conveyor; 36 is a third pulverized coal storage tank; 4 is a fourth conveyor. DETAILED DESCRIPTION

[0024] In order to make the technical personnel in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0025] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for purposes of illustration only and are not intended to be limiting.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0027] As shown in Figure 1 The automatic switching system for the pulverized coal screw conveyor of the IGCC unit of the present application includes a first coal grinding conveying device, a second coal grinding conveying device, a third coal grinding conveying device, and a fourth conveyor 4.

[0028] The fourth conveyor 4 is connected to the first coal grinding conveying device, the second coal grinding conveying device, and the third coal grinding conveying device in sequence.

[0029] The first coal grinding conveying device comprises a first filter 11, a first feeder 12, a first three-way valve 13, a first plug valve 14, a first conveyor 15 and a first pulverized coal storage tank 16.

[0030] The outlet of the first filter 11 is connected to the inlet of the first feeder 12, the outlet of the first feeder 12 is connected to the first valve port 131 of the first three-way valve 13, the second valve port 132 of the first three-way valve 13 is connected to the first conveyor 15, the third valve port 133 of the first three-way valve 13 is connected to the fourth conveyor 4, the first plug valve 14 is arranged between the fourth conveyor 4 and the first conveyor 15, and the first conveyor 15 is connected to the first pulverized coal storage tank 16.

[0031] The second coal grinding conveying device comprises a second filter 21, a second feeder 22, a second three-way valve 23, a second plug valve 24, a second conveyor 25 and a second pulverized coal storage tank 26.

[0032] The outlet of the second filter 21 is connected to the inlet of the second feeder 22, the outlet of the second feeder 22 is connected to the twenty-first valve port 231 of the second three-way valve 23, the twenty-second valve port 232 of the second three-way valve 23 is connected to the second conveyor 25, the twenty-third valve port 233 of the second three-way valve 23 is connected to the fourth conveyor 4, the second plug valve 24 is arranged between the fourth conveyor 4 and the second conveyor 25, and the second conveyor 25 is connected to the second pulverized coal storage tank 26.

[0033] The third coal grinding conveying device comprises a third filter 31, a third feeder 32, a third three-way valve 33, a third plug valve 34, a third conveyor 35 and a third pulverized coal storage tank 36.

[0034] The outlet of the third filter 31 is connected to the inlet of the third feeder 32, the outlet of the third feeder 32 is connected to the thirty-first valve port 331 of the third three-way valve 33, the thirty-second valve port 332 of the third three-way valve 33 is connected to the third conveyor 35, the thirty-third valve port 333 of the third three-way valve 33 is connected to the fourth conveyor 4, the third plug valve 34 is arranged between the fourth conveyor 4 and the third conveyor 35, and the third conveyor 35 is connected to the third pulverized coal storage tank 36.

[0035] The first coal grinding conveying device, the second coal grinding conveying device and the third coal grinding conveying device are configured in the same way, wherein the first filter 11, the second filter 21 and the third filter 31 are bag filters; the first feeder 12, the second feeder 22 and the third feeder 32 are rotary feeders; the first three-way valve 13, the second three-way valve 23 and the third three-way valve 33 are electric three-way valves; the first plug valve 14, the second plug valve 24 and the third plug valve 34 are electric plug valves; the first conveyor 15, the second conveyor 25 and the third conveyor 35 are screw conveyors, and are controlled by motors.

[0036] The screw conveyor has a forward rotation mode and a reverse rotation mode. The forward rotation mode of the screw conveyor refers to that the rotation direction of the screw blade is consistent with the conveying direction of the pulverized coal. The pulverized coal enters the conveyor from the three-way valve, and since the rotation direction of the screw blade of the conveyor is the same as the conveying direction of the pulverized coal, the pulverized coal is pushed forward along the movement direction of the screw blade, and finally reaches a certain pulverized coal storage tank. The reverse rotation mode of the screw conveyor refers to that the rotation direction of the screw blade is opposite to the conveying direction of the pulverized coal. The pulverized coal enters the conveyor from the three-way valve, and since the rotation direction of the screw blade of the conveyor is opposite to the conveying direction of the pulverized coal, the pulverized coal is pushed backward along the movement direction of the screw blade, and finally reaches a certain pulverized coal storage tank.

[0037] According to the work requirement, the coal conveying device in the automatic switching system for the pulverized coal screw conveyor of the IGCC unit can be increased or reduced. According to the work requirement, the application is suitable for pulverized coal or pulverized coal according to the work requirement.

[0038] The second object of the application is to provide a control method for automatic switching of a pulverized coal screw conveyor of an IGCC unit.

[0039] The automatic switching system for the pulverized coal screw conveyor of the IGCC unit has a first coal conveying device, a second coal conveying device and a third coal conveying device. Among the three coal conveying devices, the coal powder in the filter falls onto the conveyor through the feeder and the three-way valve, and is sent to the three coal powder storage tanks through the conveyor.

[0040] As shown in Figure 2 , the first coal conveying device starts to operate, the first conveyor 15 rotates forward, and the first plug valve 14 is opened. The first three-way valve 13 sends the coal powder to the first pulverized coal storage tank 16 through the first conveyor 15.

[0041] As shown in Figure 3 , the first pulverized coal storage tank 16 and the third pulverized coal storage tank 36 provide coal powder for the gasifier one-stage burner of the IGCC unit, the second pulverized coal storage tank 26 provides coal powder for the gasifier two-stage burner of the IGCC unit, the first pulverized coal storage tank 16 and the third pulverized coal storage tank 36 consume coal powder faster and need to be replenished frequently, and the second pulverized coal storage tank 26 consumes less. When the system is normally operated, the coal pulverizing unit adopts a two-use-one-back operation mode. The first conveyor 15, the second conveyor 26 and the third conveyor 36 correspond to the first coal powder storage tank 16, the second pulverized coal storage tank 26 and the third pulverized coal storage tank 36 one by one. Through the combination of the fourth conveyor 4 and the three-way valves and plug valves between the devices, the coal powder in any filter can be sent to any pulverized coal storage tank.

[0042] When the first and second coal pulverizing and conveying devices are running, the first filter 11 directly sends the coal powder to the first coal powder storage tank 16, and the second coal pulverizing and conveying device sends the coal powder to the fourth conveyor 4 through the second three-way valve 23, the fourth conveyor 4 reverses to send to the third plug valve 34, and finally to the third coal powder storage tank 36.

[0043] According to the different scenes of each coal pulverizing and conveying device, there are nine kinds of control methods. When any one of the conveyors in the application trips, the system can automatically execute the corresponding steps to prevent the accumulation of coal powder. The specific steps are as follows:

[0044] (1) When the first and second coal pulverizing and conveying devices are running, the third coal pulverizing and conveying device is standby, and the fourth conveyor 4 is running in the reverse mode, the first filter 11 sends the coal powder to the first conveyor 15 through the second valve port 132 of the first three-way valve 13, and the coal powder is directly conveyed to the first coal powder storage tank 16 through the first conveyor 15; the second filter 21 sends the coal powder to the fourth conveyor 4 through the second valve port 233 of the second three-way valve 23, and the fourth conveyor 4 reverses to send the coal powder to the third conveyor 35, and the third conveyor 35 sends the coal powder to the third coal powder storage tank 36. After the running personnel confirm that the running direction of each device and the opening and closing of the valve are correct, press the “automatic switching mode” button on the control panel, and the “automatic switching mode has been put into” appears on the control panel. At this time, the third conveyor 35 trips, and automatically switches to supply coal powder from the second coal powder storage tank 26 in the second coal pulverizing and conveying device. The steps are as follows:

[0045] a) The third conveyor 35 trips;

[0046] b) Open the second plug valve 24;

[0047] c) Close the second valve port 233 of the second three-way valve 23, open the second valve port 232, and the coal powder in the second filter 21 is conveyed to the second conveyor 25 through the second valve port 232 of the second three-way valve 23, and the second conveyor 25 conveys the coal powder to the second coal powder storage tank 26;

[0048] d) Close the third plug valve 34 to prevent the coal powder in the fourth conveyor 4 from entering the third conveyor 35;

[0049] e) Switch the fourth conveyor 4 from reverse to forward mode;

[0050] (2) The first and second coal grinding conveyors are in operation, the third coal grinding conveyor is in standby, and the fourth conveyor 4 is in reverse rotation mode. The first filter 11 sends the pulverized coal to the first conveyor 15 through the second valve port 132 of the first three-way valve 13, and the first conveyor 15 directly conveys the pulverized coal to the first pulverized coal storage tank 16. The second filter 21 sends the pulverized coal to the fourth conveyor 4 through the second valve port 233 of the second three-way valve 23, and the fourth conveyor 4 reverses to send the pulverized coal to the third conveyor 35, which sends the pulverized coal to the third pulverized coal storage tank 36. After the operating personnel confirm that the running direction of each device and the opening and closing of the valve are correct, they press the "automatic switching mode" button, and the page displays "automatic switching mode has been put into operation". At this time, the first conveyor 15 trips suddenly, automatically switches the working state of supplying pulverized coal from the first coal grinding conveyor to the third coal grinding conveyor, and the second pulverized coal storage tank 26 in the second coal grinding conveyor starts to supply pulverized coal. The steps are as follows:

[0051] a) The first conveyor 15 trips;

[0052] b) Close the second plug valve 24;

[0053] c) Close the second valve port 233 of the second three-way valve 23, open the second valve port 232, and send the pulverized coal in the second filter 21 to the second conveyor 25 through the second valve port 232 of the second three-way valve 23, and the second conveyor 25 conveys the pulverized coal to the second pulverized coal storage tank 26;

[0054] d) Close the second valve port 132 of the first three-way valve 13, open the third valve port 133, and send the pulverized coal in the first filter 11 to the fourth conveyor 4 through the third valve port 133 of the first three-way valve 13, and the pulverized coal on the fourth conveyor 4 reaches the third pulverized coal storage tank 36 through the third conveyor 35;

[0055] e) Close the first plug valve 14;

[0056] (3) The first and second coal grinding and conveying devices are running, the third coal grinding and conveying device is standby, and the fourth conveyor 4 is running in the reverse rotation mode. In this mode, the first filter 11 sends the pulverized coal to the first conveyor 15 through the second valve port 132 of the first three-way valve 13, and the first conveyor 15 directly sends the pulverized coal to the first pulverized coal storage tank 16. The second filter 21 sends the pulverized coal to the fourth conveyor 4 through the second valve port 233 of the second three-way valve 23, and the fourth conveyor 4 reverses to send the pulverized coal to the third conveyor 35, which sends the pulverized coal to the third pulverized coal storage tank 36. After the operating personnel confirm that the running direction of each device and the opening and closing of the valves are correct, the "automatic switching mode" button is pressed, and "automatic switching mode has been put into operation" appears on the page. At this time, the fourth conveyor 4 suddenly trips, and the second pulverized coal storage tank 26 in the second coal grinding and conveying device is automatically switched to supply the pulverized coal. The steps are as follows:

[0057] a) The first conveyor 15 trips;

[0058] b) Close the second valve port 233 of the second three-way valve 23, open the second valve port 232, and send the pulverized coal in the second filter 21 to the second conveyor 25 through the second valve port 232 of the second three-way valve 23, and the second conveyor 25 sends the pulverized coal to the second pulverized coal storage tank 26;

[0059] c) Open the second plug valve 24;

[0060] (4) The first and third coal grinding and conveying devices are running, the second coal grinding and conveying device is standby, and the fourth conveyor 4 is running in the reverse rotation mode or the steam rotation mode. After the operating personnel confirm that the running direction of each device and the opening and closing of the valves are correct, the "automatic switching mode" button is pressed, and "automatic switching mode has been put into operation" appears on the page. At this time, the third conveyor 35 suddenly trips, and the third coal grinding and conveying device is automatically switched to the second pulverized coal storage tank 26 in the second coal grinding and conveying device to supply the pulverized coal. The steps are as follows:

[0061] a) The third conveyor 35 trips;

[0062] b) Confirm that the fourth conveyor 4 is in the forward rotation mode. If not, automatically switch the fourth conveyor 4 from the reverse rotation mode to the forward rotation mode;

[0063] c) Open the second plug valve 24;

[0064] d) Close the third plug valve 34;

[0065] e) Close the third valve port 332 of the third three-way valve 33, open the third valve port 333, and send the pulverized coal in the third filter 31 to the fourth conveyor 4;

[0066] f) open the third plug valve 34.

[0067] (5) The first and third coal pulverizing conveyors are running, the second coal pulverizing conveyor is standby, and the fourth conveyor 4 is running in reverse mode (in this case, both forward and reverse modes can run). After the operator confirms that the running direction of each device and the on-off state of the valve are correct, the "automatic switching mode" button is pressed, and "automatic switching mode has been put into operation" appears on the page. At this time, the first conveyor 15 suddenly trips, and the first coal pulverizing conveyor is automatically switched to the second pulverized coal storage tank 26 to supply coal powder. The steps are as follows:

[0068] a) The first conveyor 15 trips;

[0069] b) Confirm that the fourth conveyor 4 is in reverse mode, if not, automatically switch the fourth conveyor 4 from forward mode to reverse mode;

[0070] c) Open the second plug valve 24;

[0071] d) Close the first plug valve 14;

[0072] e) Switch the first three-way valve 13 to the fourth conveyor 4 direction;

[0073] f) Open the third plug valve 34.

[0074] (6) The first and third coal pulverizing conveyors are running, the second coal pulverizing conveyor is standby, and the fourth conveyor 4 is running in reverse mode (in this case, both forward and reverse modes can run). After the operator confirms that the running direction of each device and the on-off state of the valve are correct, the "automatic switching mode" button is pressed, and "automatic switching mode has been put into operation" appears on the page. At this time, the fourth conveyor 4 suddenly trips, if the second pulverized coal storage tank 26 is not in the state of supplying coal powder at this time, the status remains unchanged. If the second pulverized coal storage tank 26 is being supplied with coal powder from the first coal pulverizing conveyor at this time, the fourth conveyor 4 suddenly trips, and the supply of coal powder is automatically switched back to the first pulverized coal storage tank 16. The steps are as follows:

[0075] a) The fourth conveyor 4 trips;

[0076] b) Switch the first three-way valve 13 to the first conveyor 15 direction;

[0077] c) Open the first plug valve 14;

[0078] If the second pulverized coal storage tank 26 is being supplied with coal powder from the third coal pulverizing conveyor at this time, the fourth conveyor 4 suddenly trips, and the supply of coal powder is automatically switched back to the third pulverized coal storage tank 36. The steps are as follows:

[0079] a) The fourth conveyor 4 trips;

[0080] b) Switch the third three-way valve 33 to the direction of the third conveyor 35;

[0081] c) Open the third gate valve 34;

[0082] (7) Coal mill B / C series is running, A series is on standby, and the fourth conveyor 4 is running in forward rotation mode (in this condition, it can only be run in forward rotation mode). After the operator confirms that the running direction of each device and the valve switch status are correct, press the "Automatic Switching Mode" button, and "Automatic Switching Mode is in progress" will appear on the screen. At this time, the first conveyor 15 suddenly trips, automatically switching the second coal mill conveying device to supply coal powder to the second pulverized coal storage tank 26, and maintaining the third coal mill conveying device supplying coal powder to the third pulverized coal storage tank 36.

[0083] The steps are as follows:

[0084] a) First conveyor 15 tripped;

[0085] b) Switch the fourth conveyor 4 from forward rotation mode to reverse rotation mode;

[0086] c) Switch the second three-way valve 23 to the direction of the second conveyor 25;

[0087] d) Open the second gate valve 24;

[0088] e) Open the third gate valve 34;

[0089] (8) The second and third coal mill conveyors are in operation, the first coal mill conveyor is on standby, and the fourth conveyor 4 is in forward rotation mode (in this condition, it can only operate in forward rotation mode). After the operator confirms that the operating direction of each device and the valve switch status are correct, the "Automatic Switching Mode" button is pressed, and "Automatic Switching Mode is in progress" appears on the screen. At this time, the third conveyor 35 suddenly trips, automatically switching the third coal mill conveyor to the first pulverized coal storage tank 16 to supply pulverized coal, and then switching to the second pulverized coal storage tank 26 to supply pulverized coal. The steps are as follows:

[0090] a) The third conveyor 35 tripped;

[0091] b) Switch the fourth conveyor 4 from reverse rotation mode to forward rotation mode;

[0092] c) Switch the second three-way valve 23 to the direction of the second conveyor 25;

[0093] d) Close the second gate valve 24;

[0094] e) Open the first gate valve 14;

[0095] f) Close the third gate valve 34;

[0096] g) switch the third three-way valve 33 to the fourth conveyor 4 direction;

[0097] (9) the second and third coal grinding conveyors are running, the first coal grinding conveyor is standby, the fourth conveyor 4 is running in the forward rotation mode (in this working condition, only the forward rotation mode can be run), the operator confirms that the running directions of the various devices and the opening and closing conditions of the valves are correct, then clicks the "automatic switching mode" button, and "the automatic switching mode has been put into operation" appears on the page. At this time, the fourth conveyor 4 suddenly trips, automatically switches the second coal grinding conveyor to supply pulverized coal to the second pulverized coal storage tank 26, and keeps the third coal grinding conveyor to supply pulverized coal to the third pulverized coal storage tank 36. The steps are as follows:

[0098] a) the fourth conveyor 4 trips;

[0099] b) switch the second three-way valve 23 to the second conveyor 25 direction;

[0100] c) open the second plug valve 24;

[0101] Those skilled in the art will appreciate that embodiments of the application can be supplied as methods, systems, or computer program products. Accordingly, the application can be embodied in the form of complete hardware embodiments, complete software embodiments, or embodiments combining software and hardware aspects. Furthermore, the application can be embodied in the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage, etc.) having computer usable program code embodied thereon.

[0102] The present application is described in reference to the flowchart and / or block diagram of the method, apparatus (system), and computer program product according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing apparatus to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing apparatus produce the functions specified in the flowchart and / or block diagram block or blocks. Figure 1 The functions specified in a flow or multiple flows and / or blocks Figure 1 The functions specified in a flow or multiple flows and / or blocks

[0103] These computer program instructions can also be stored in a computer-readable memory that can direct the computer or other programmable data processing apparatus to work in a specific manner, so that the instructions stored in the computer-readable memory produce a product including instruction means, which implements the functions specified in the flowchart and / or block diagram block or blocks. Figure 1 The functions specified in a flow or multiple flows and / or blocksFigure 1 the function specified in the one or more blocks.

[0104] These computer program instructions can also be loaded into computer or other programmable data processing devices, so that a series of operation steps are performed on the computer or other programmable data processing devices to generate computer-implemented processes, thus the instructions executed on the computer or other programmable data processing devices provide processes for implementing the flows Figure 1 the flows or the plurality of flows and / or blocks Figure 1 the steps of the function specified in the one or more blocks.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application rather than limit it. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and any modification or equivalent replacement without departing from the spirit and scope of the present application should be covered in the protection scope of the claims of the present application.

Claims

1. An automatic switchover method for an IGCC unit coal screw conveyor, characterized in that, The first coal conveying device, the second coal conveying device, and the third coal conveying device are in operation, the first filter (11) sends the pulverized coal into the first conveyor (15) through the first three-way valve (13), the first conveyor (15) sends the pulverized coal into the first pulverized coal storage tank (16); the second filter (21) sends the pulverized coal into the second conveyor (25) through the second three-way valve (23), the second conveyor (25) sends the pulverized coal into the second pulverized coal storage tank (26); the third filter (31) sends the pulverized coal into the third conveyor (35) through the third three-way valve (33), the third conveyor (35) sends the pulverized coal into the third pulverized coal storage tank (36); If one of the first conveyor (15), the second conveyor (25), and the third conveyor (35) fails, the corresponding filter sends the pulverized coal to the fourth conveyor (4) through the three-way valve, the fourth conveyor (4) sends the pulverized coal into the fault-free conveyor, and the fault-free conveyor sends the pulverized coal into the corresponding pulverized coal storage tank. The first coal conveying device, the second coal conveying device, the third coal conveying device, and the fourth conveyor (4) are included.

2. The automatic switching method for IGCC unit pulverized coal screw conveyor according to claim 1, characterized in that, The first coal conveying device includes the first filter (11), the first conveyor (15), and the first pulverized coal storage tank (16). The first filter (11) is connected with the first conveyor (15) and the fourth conveyor (4) through the first three-way valve (13), and the first conveyor (15) is connected with the first pulverized coal storage tank (16). The second filter (21) is connected with the second conveyor (25) and the fourth conveyor (4) through the second three-way valve (23), and the second conveyor (25) is connected with the second pulverized coal storage tank (26). The third filter (31) is connected with the third conveyor (35) and the fourth conveyor (4) through the third three-way valve (33), and the third conveyor (35) is connected with the third pulverized coal storage tank (36). The fourth conveyor (4) is connected with the first pulverized coal storage tank (16), the second pulverized coal storage tank (26), and the third pulverized coal storage tank (36). The outlet of the first filter (11) is connected with the inlet of the first feeder (12), and the outlet of the first feeder (12) is connected with the first valve port (131) of the first three-way valve (13).

3. The automatic switching method for IGCC unit pulverized coal screw conveyor according to claim 1, characterized in that, The outlet of the second filter (21) is connected with the inlet of the second feeder (22), and the outlet of the second feeder (22) is connected with the twenty-first valve port (231) of the second three-way valve (23).

4. The automatic switching method for IGCC unit pulverized coal screw conveyor according to claim 1, characterized in that, The outlet of the third filter (31) is connected with the inlet of the third feeder (32), and the outlet of the third feeder (32) is connected with the thirty-first valve port (231) of the third three-way valve (33).

5. The method of claim 1, wherein the method further comprises: The second valve port (132) of the first three-way valve (13) is connected with the first conveyor (15), and the third valve port (133) of the first three-way valve (13) is connected with the fourth conveyor (4).

6. The method of claim 1, wherein the method further comprises: The twenty-second valve port (232) of the second three-way valve (23) is connected with the second conveyor (25), and the twenty-third valve port (233) of the second three-way valve (23) is connected with the fourth conveyor (4).

7. The method of claim 1, wherein the method further comprises: ​ The thirty-second valve port (332) of the third three-way valve (33) is connected with the third conveyor (35), and the thirty-third valve port (333) of the third three-way valve (33) is connected with the fourth conveyor (4).

8. The method for automatic switching of a screw coal feeder for an IGCC unit of claim 1, wherein, The first plug valve (14) is arranged between the fourth conveyor (4) and the first conveyor (15).

9. The method of claim 1, wherein the method further comprises: The second plug valve (24) is arranged between the fourth conveyor (4) and the second conveyor (25).

10. The method of claim 1, wherein the method further comprises: The third plug valve (34) is arranged between the fourth conveyor (4) and the third conveyor (35).

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