Pebble coal system

Abstract

The utility model provides a pebble coal system. The pebble coal system comprises a first coal grinding subsystem, a second coal grinding subsystem, a first branch pipe, a second branch pipe, a pebble coal header pipe, a pebble coal slag bin, a vacuum pump, a first pressure transmitter, a second pressure transmitter and a control module, each coal grinding subsystem comprises a coal grinding machine, a slag discharging box and a feeding machine which are arranged on a feeding branch pipe; each branch pipe is provided with a pneumatic valve and a manual valve; the control module is used for comparing the pressure measured by the first pressure transmitter and the pressure measured by the second pressure transmitter, and if the pressure is not equal, a first alarm is output. The device can assist a user in judging the fault condition of the specific position of the pebble coal system pipeline according to the alarm signal.

Description

Technical Field

[0001] The present application relates to the field of negative pressure pneumatic conveying of pebble coal in thermal power plants, and in particular to a pebble coal system. Background Art

[0002] Pebble coal is a mixture of stones, coal ore, metal blocks, etc. that are not ground into powder during the pulverization process of thermal power plants using coal mills, as well as a small amount of coal particles. It has a low combustion value and has no utilization value. Pebble coal produced under the coal mill needs to be cleaned and transported.

[0003] At present, the main methods of handling pebble coal in thermal power plants are: manual removal, mechanical transportation, hydraulic transportation, and pneumatic transportation. According to whether the material is sucked or pressed in the pneumatic conveying system, the pneumatic conveying system can be divided into two categories: negative pressure pneumatic conveying system and positive pressure pneumatic conveying system. The pebble coal system using negative pressure pneumatic conveying is prone to blockage and failure of system equipment due to the harsh operating environment, which causes the pebble coal system to fail to work normally and increases maintenance costs. Summary of the invention

[0004] In response to the above problems, the present application provides a pebble coal system, which can obtain fault conditions of pebble coal pipelines and improve transportation efficiency.

[0005] To achieve the purpose of the present application, the present application provides the following technical solutions: a pebble coal system, characterized in that it includes: a first coal grinding subsystem, a second coal grinding subsystem, a first branch pipe, a second branch pipe, a pebble coal main pipe, a pebble coal slag bin, a vacuum pump, a first pressure transmitter, a second pressure transmitter and a control module; each of the coal grinding subsystems includes a coal mill, a slag box and a feeder arranged on a feed branch pipe; each of the branch pipes is provided with a pneumatic valve and a manual valve;

[0006] The pebble coal slag bin is connected to the first end of the pebble coal main pipe; the vacuum pump is connected to the pebble coal slag bin to provide negative pressure;

[0007] The first end of the first branch pipe is connected to the stone coal main pipe, the first pneumatic valve on the first branch pipe is located on a side close to the first end of the first branch pipe, the first feed branch pipe in the first coal grinding subsystem is connected to the first branch pipe on a side close to the first manual valve on the first branch pipe; the first pressure transmitter is located between the first end of the first branch pipe and the first pneumatic valve;

[0008] The first end of the second branch pipe is connected to the pebble coal main pipe and is located on a side of the first branch pipe away from the pebble coal slag bin; the second pneumatic valve on the second branch pipe is located on a side close to the first end of the second branch pipe; the second feed branch pipe in the second coal grinding subsystem is connected to the second branch pipe on a side close to the second manual valve on the second branch pipe; the second pressure transmitter is located between the first end of the second branch pipe and the second pneumatic valve;

[0009] The control module includes a first control unit, which is used to compare the pressures measured by the first pressure transmitter and the second pressure transmitter, and output a first alarm if the pressures are not equal.

[0010] Optionally, the control module is electrically connected to the first pressure transmitter and the second pressure transmitter.

[0011] In a possible implementation, the pebble coal system further includes: a vacuum pump pneumatic door, an expansion joint, a third pressure transmitter and a fourth pressure transmitter;

[0012] The vacuum pump pneumatic door is located between the vacuum pump and the stone and coal slag bin; the expansion joint is located between the stone and coal slag bin and the first end of the first branch pipe;

[0013] The third pressure transmitter is located between the vacuum pump pneumatic door and the stone and coal slag bin;

[0014] The fourth pressure transmitter is located between the expansion joint and the first end of the first branch pipe;

[0015] The control module also includes a second control unit, which is used to compare the pressures measured by the third pressure transmitter and the fourth pressure transmitter, and output a second alarm if the pressure measured by the third pressure transmitter is lower than the pressure measured by the fourth pressure transmitter.

[0016] In a possible implementation, the pebble coal system further includes: a fifth pressure transmitter and a sixth pressure transmitter;

[0017] The fifth pressure transmitter is located between the first feed branch pipe and the first manual valve; the sixth pressure transmitter is located between the second feed branch pipe and the second manual valve;

[0018] The control module also includes a third control unit and a fourth control unit;

[0019] The third control unit is used to compare the pressures measured by the first pressure transmitter and the fifth pressure transmitter, and output a third alarm if the pressure measured by the first pressure transmitter is lower than the pressure measured by the fifth pressure transmitter;

[0020] The fourth control unit is used to compare the pressure between the second pressure transmitter and the sixth pressure transmitter, and output a fourth alarm if the pressure measured by the second pressure transmitter is lower than the pressure measured by the sixth pressure transmitter.

[0021] In a possible implementation, the control module further includes a fifth control unit and a sixth control unit;

[0022] The fifth control unit is provided with a first parameter range, and the fifth control unit is used to calculate the difference between the pressures measured by the third pressure transmitter and the fifth pressure transmitter, and output a fifth alarm if the difference is not within the first parameter range;

[0023] The sixth control unit is provided with a second parameter range, and is used to calculate the difference between the pressure measured by the third pressure transmitter and the pressure measured by the sixth pressure transmitter, and output a sixth alarm if the difference is not within the second parameter range.

[0024] Optionally, the first parameter range is the total pipeline resistance value range of the pebble coal main pipe and the first branch pipe, and the second parameter range is the total pipeline resistance value range from the pebble coal main pipe to the second branch pipe.

[0025] Optionally, the first parameter range is equal to the second parameter range.

[0026] Optionally, the first parameter range is a first parameter threshold; the second parameter range is a second parameter threshold. Exemplarily, the fifth control unit is used to calculate the difference between the pressure measured by the third pressure transmitter and the pressure measured by the fifth pressure transmitter, and outputs a fifth alarm if the difference is not equal to the first parameter threshold; the sixth control unit is provided with a second parameter threshold, and the sixth control unit is used to calculate the difference between the pressure measured by the third pressure transmitter and the pressure measured by the sixth pressure transmitter, and outputs a sixth alarm if the difference is not equal to the second parameter threshold.

[0027] In a possible implementation, the pebble coal system further includes: a first slag discharge box; a first temperature sensor is disposed in the first slag discharge box;

[0028] The control module also includes a seventh control unit, which is provided with a temperature parameter threshold. The seventh control unit is used to compare the temperature measured by the first temperature sensor with the temperature parameter threshold. If the temperature measured by the temperature sensor is greater than the temperature parameter threshold, the seventh alarm is output.

[0029] Optionally, the temperature parameter threshold is 20°C.

[0030] In a possible implementation, the pebble coal system further includes: a pebble coal feeder; the pebble coal feeder is provided with a frequency converter;

[0031] The frequency converter is used to control the rotation speed of the pebble coal feeder.

[0032] Optionally, the frequency converter is arranged below the power supply circuit of the pebble coal feeder and belongs to the air return circuit.

[0033] In a possible implementation, the control module further includes an eighth control unit, and the eighth control unit is used to control the frequency converter.

[0034] In a possible implementation, the control module is a distributed control system DCS.

[0035] The technical effects of the technical solution provided by this application are as follows:

[0036] By adopting the pebble coal system of the present application, the following technical effects can be achieved: the pebble coal system assists the user to accurately determine the location of the pipeline where the pebble coal system fails and conduct targeted maintenance through the coordinated action of various pressure transmitters, temperature sensors and control modules; at the same time, a frequency converter is set on the pebble coal feeder to assist the user to adjust the speed of the pebble coal feeder according to the type and quality of coal, the amount of pebble coal and the operating status of the pulverizing system, so as to make the transportation of pebble coal more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are used to provide further understanding of the present application and constitute a part of the specification. They are used to explain the present application together with the embodiments of the present application and do not constitute a limitation of the present application.

[0038] Figure 1 A structural schematic diagram of a pebble coal system provided in an embodiment of the present application;

[0039] Figure 2 A schematic diagram of a pebble coal system control module provided in an embodiment of the present application.

[0040] Figure numerals: 1-first coal grinding subsystem, 101-first coal grinding machine, 102-first inlet manual valve, 13-first slag box, 131-first temperature sensor, 14-first outlet manual valve, 15-stone coal feeder; 2-first branch pipe, 21-first pressure transmitter, 22 first pneumatic valve, 23-fifth pressure transmitter, 24-first manual valve; 3-second coal grinding subsystem, 31-second coal grinding machine, 32-second inlet manual valve, 33-second slag box, 331-second temperature sensor, 34-second outlet manual valve, 35-stone coal feeder; 4-second branch pipe, 41-second pressure transmitter, 42-second pneumatic valve, 43-sixth pressure transmitter, 44-second manual valve; 5-stone coal main pipe; 6-fourth pressure transmitter; 7-expansion joint; 8-stone coal slag bin, 81-third temperature sensor, 82-level meter, 83-stone coal slag bin slag discharge pneumatic valve; 9-third pressure transmitter; 10-vacuum pump inlet pneumatic valve; 11-vacuum pump; 12-control module, 121-first control unit, 122-second control unit, 123-third control unit, 124-fourth control unit, 125-fifth control unit, 126-sixth control unit, 127-seventh control unit, 128-eighth control unit. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of this application, unless otherwise specified, "plurality" means two or more.

[0043] Figure 1-2 The structural diagram of the pebble coal system provided in the embodiment of the present application is shown in FIG. Figure 1As shown, the embodiment of the present application provides a pebble coal system, including: a first coal grinding subsystem 1, a second coal grinding subsystem 3, a first branch pipe 2, a second branch pipe 4, a pebble coal main pipe 5, a pebble coal slag bin 8, a vacuum pump 11, a first pressure transmitter 21, a second pressure transmitter 41 and a control module 12; each of the coal grinding subsystems includes a coal mill, a slag box and a feeder arranged on a feeding branch pipe; each of the branch pipes is provided with a pneumatic valve and a manual valve;

[0044] The pebble coal slag bin 8 is connected to the first end of the pebble coal main pipe 5; the vacuum pump 11 is connected to the pebble coal slag bin 8 to provide negative pressure;

[0045] The first end of the first branch pipe 2 is connected to the stone coal main pipe 5, the first pneumatic valve 22 on the first branch pipe is located on a side close to the first end of the first branch pipe, the first feed branch pipe in the first coal grinding subsystem 1 is connected to the first branch pipe on a side close to the first manual valve 24 on the first branch pipe; the first pressure transmitter 21 is located between the first end of the first branch pipe and the first pneumatic valve 22;

[0046] The first end of the second branch pipe 4 is connected to the pebble coal main pipe 5 and is located on the side of the first branch pipe away from the pebble coal slag bin. The second pneumatic valve 42 on the second branch pipe 4 is located on the side close to the first end of the second branch pipe. The second feed branch pipe in the second coal grinding subsystem 3 is connected to the second branch pipe on the side close to the second manual valve 44 on the second branch pipe. The second pressure transmitter 41 is located between the first end of the second branch pipe and the second pneumatic valve 42.

[0047] The control module 12 includes a first control unit 121 for comparing the pressures measured by the first pressure transmitter 21 and the second pressure transmitter 41, and outputting a first alarm if the pressures are not equal. This embodiment can detect damage between the first branch pipe and the second branch pipe connection pipeline.

[0048] Optionally, the first control unit is electrically connected to the first pressure transmitter and the second pressure transmitter.

[0049] Optionally, the pebble coal system includes multiple branch pipes, and the connection method of the device on each branch pipe is the same as above. A pressure transmitter is arranged between the first end of each branch pipe and the pneumatic valve, and the first control unit compares the pressures measured by the pressure transmitters on two adjacent branch pipes, and outputs an alarm signal if they are not equal. This implementation method facilitates the user to understand the blockage between two adjacent branch pipes, so as to avoid the pebble coal system being shut down due to untimely maintenance.

[0050] In a possible implementation, the pebble coal system further includes: a vacuum pump pneumatic door 10, an expansion joint 7, a third pressure transmitter 9 and a fourth pressure transmitter 6;

[0051] The vacuum pump pneumatic door 10 is located between the vacuum pump 11 and the stone and coal slag bin 8; the expansion joint 7 is located between the stone and coal slag bin 8 and the first end of the first branch pipe 2;

[0052] The third pressure transmitter 9 is located between the vacuum pump pneumatic door 10 and the stone and coal slag bin 8;

[0053] The fourth pressure transmitter 6 is located between the expansion joint 7 and the first end of the first branch pipe 2;

[0054] The control module 12 further includes a second control unit 122, which is used to compare the pressures measured by the third pressure transmitter 9 and the fourth pressure transmitter 6, and output a second alarm if the pressure measured by the third pressure transmitter 9 is less than the pressure measured by the fourth pressure transmitter 6. This embodiment can detect damage to the expansion joint.

[0055] Optionally, the second control unit is electrically connected to the third pressure transmitter and the fourth pressure transmitter.

[0056] Optionally, a material level meter 82 is also provided on the gravel slag bin 8. The liquid level meter is used to detect the gravel slag storage situation in the gravel slag bin 8. When the gravel slag storage amount reaches the liquid level meter, slag is discharged. This implementation can prevent the gravel slag bin from being full and damaging the expansion joint.

[0057] In a possible implementation, the pebble coal system further includes: a fifth pressure transmitter 23, a sixth pressure transmitter 43;

[0058] The fifth pressure transmitter 23 is located between the first feed branch pipe and the first manual valve 24; the sixth pressure transmitter 43 is located between the second feed branch pipe and the second manual valve 44;

[0059] The control module 12 further includes a third control unit 123 and a fourth control unit 124;

[0060] The third control unit 123 is used to compare the pressures measured by the first pressure transmitter 21 and the fifth pressure transmitter 23, and output a third alarm if the pressure measured by the first pressure transmitter 21 is lower than the pressure measured by the fifth pressure transmitter 23;

[0061] The fourth control unit 124 is used to compare the pressure between the second pressure transmitter 41 and the sixth pressure transmitter 43, and output a fourth alarm if the pressure measured by the second pressure transmitter 41 is less than the pressure measured by the sixth pressure transmitter 43. This embodiment can detect the blockage of the first branch pipe.

[0062] Optionally, the third control unit is electrically connected to the first pressure transmitter and the fifth pressure transmitter, and the fourth control unit is electrically connected to the second pressure transmitter and the sixth pressure transmitter.

[0063] Optionally, the pebble coal system includes multiple branch pipes, and the connection method of the device on each branch pipe is the same as above. A pressure transmitter is set between the feed branch pipe and the manual valve on each branch pipe. The control module compares the pressures measured by the two pressure transmitters on each branch pipe, and outputs an alarm signal if they are not equal. This implementation method is convenient for users to detect the blockage between each branch pipe.

[0064] In a possible implementation, the control module 12 further includes a fifth control unit 125 and a sixth control unit 126;

[0065] The fifth control unit is provided with a first parameter range, and the fifth control unit is used to calculate the difference between the pressures measured by the third pressure transmitter and the fifth pressure transmitter, and output a fifth alarm if the difference is not within the first parameter range;

[0066] The sixth control unit is provided with a second parameter range, and is used to calculate the difference between the pressure measured by the third pressure transmitter and the pressure measured by the sixth pressure transmitter, and output a sixth alarm if the difference is not within the second parameter range.

[0067] Optionally, the first parameter range is the total pipeline resistance value range of the pebble coal main pipe and the first branch pipe, and the second parameter range is the total pipeline resistance value range from the pebble coal main pipe to the second branch pipe.

[0068] Optionally, the first parameter range is equal to the second parameter range.

[0069] Optionally, the first parameter range is a first parameter threshold; the second parameter range is a second parameter threshold. Exemplarily, the fifth control unit is used to calculate the difference between the pressure measured by the third pressure transmitter and the pressure measured by the fifth pressure transmitter, and outputs a fifth alarm if the difference is not equal to the first parameter threshold; the sixth control unit is provided with a second parameter threshold, and the sixth control unit is used to calculate the difference between the pressure measured by the third pressure transmitter and the pressure measured by the sixth pressure transmitter, and outputs a sixth alarm if the difference is not equal to the second parameter threshold. This implementation is used to detect whether the first manual valve and the second manual valve are loose or fall off.

[0070] In a possible implementation, the pebble coal system further includes: a first slag box 13; a first temperature sensor 131 is disposed in the first slag box 13;

[0071] The control module 12 also includes a seventh control unit 127, which is provided with a temperature parameter threshold. The seventh control unit 127 is used to compare the temperature of the first temperature sensor 131 with the temperature parameter threshold. If the temperature measured by the first temperature sensor 131 is greater than the temperature parameter threshold, a seventh alarm is output.

[0072] Optionally, the first temperature sensor is electrically connected to the seventh control unit.

[0073] Optionally, the temperature parameter threshold is 20° C. Exemplarily, the first temperature sensor is used to detect the temperature in the first slag box, and the seventh control unit obtains the first temperature. If the first temperature is greater than 20° C., it indicates that the temperature in the first slag box is too high, and the seventh alarm is output. If the first temperature is less than or equal to 20° C., it indicates that the first slag box is operating normally.

[0074] Optionally, a temperature sensor is provided on each pebble coal branch pipe, and the specific implementation process is as described above.

[0075] By adopting this implementation mode, when the pebble coal slag discharge is not smooth, an alarm is used to remind the user to promptly inspect the slag box to avoid the slag box temperature being too high due to the poor pebble coal slag discharge, thereby causing consequences such as pebble coal ignition, expansion joint damage, and pebble coal slag bin sintering.

[0076] Optionally, the stone coal slag bin 8 is provided with a third temperature sensor 81, and the third temperature sensor 81 is used to detect the temperature in the stone coal slag bin 8. The seventh control unit is also used to compare the temperature measured by the third temperature sensor 81 with the temperature parameter threshold, and output an alarm signal if the temperature measured by the third temperature sensor 81 is greater than the temperature parameter threshold. This embodiment is convenient for overhauling the stone coal slag bin.

[0077] In a possible implementation, the pebble coal system also includes: a pebble coal feeder 15; the pebble coal feeder 15 is provided with a frequency converter; the frequency converter is used to control the rotation speed of the pebble coal feeder. This implementation can control the rotation speed of the pebble coal feeder according to the coal quality, the amount of pebble coal, and the operating status of the pulverizing system.

[0078] Optionally, the frequency converter is arranged below the power supply circuit of the pebble coal feeder and belongs to the air return circuit.

[0079] In a possible implementation, the control module 12 further includes an eighth control unit 128, and the eighth control unit 128 is used to control the frequency converter.

[0080] Optionally, the eighth control unit is electrically connected to the frequency converter.

[0081] Optionally, a frequency converter frequency adjustment interface is provided on the eighth control unit, and the rotation speed of the pebble coal feeder can be remotely controlled by adopting this implementation.

[0082] In a possible implementation, the control module is a distributed control system DCS.

[0083] Optionally, the pulverizing system is provided with a signal collector, which is used to collect the operating signal of the pulverizing system. The distributed control system DCS generates digital analog signals 0 and 1 according to the operating signal of the pulverizing system. When the signal is 1, the pulverizing system is put into the pebble coal system. When the signal is 0, after the pebble coal system has run for two cycles, the pulverizing system cuts out the pebble coal system. This implementation method can cut in the pebble coal system according to the operating status of the pulverizing system.

[0084] Optionally, the distributed control system DCS adds an audible and visual alarm module for controlling the audible and visual alarm to give an alarm.

[0085] Here’s how it works:

[0086] First, turn on the vacuum pump 11 to provide negative pressure to the pebble coal system, use negative pressure pneumatic conveying of the pebble coal, open the vacuum pump pneumatic valve 10, the first pneumatic valve 22, and the first inlet manual valve 102 and the first outlet manual valve 14 on the first slag box 13, and turn on the first coal mill 101.

[0087] When the negative pressure pneumatic conveying system for pebble coal is in operation, in the first coal grinding subsystem 1, the raw coal is ground in the first coal mill 101, and the pebble coal produced enters the first slag box 13, and then is conveyed to the first branch pipe 2 through the pebble coal feeder 15, and the pebble coal enters the pebble coal main pipe 5 through the first branch pipe, and the pebble coal enters the pebble coal slag bin 8 through the pebble coal main pipe 6 and the expansion joint 7, and finally the pebble coal is discharged from the pebble coal slag bin outlet. Similarly, when the second coal grinding subsystem 3 and the second branch pipe 4 are switched to convey pebble coal, the first pneumatic valve 22 on the first branch pipe is closed, and the second pneumatic valve 42 on the second branch pipe is opened, and the pebble coal is conveyed in the same manner as above.

[0088] In the above-mentioned pebble coal transportation system, the first pressure transmitter 21 is located between the first end of the first branch pipe and the first pneumatic valve 22; the second pressure transmitter 43 is located between the first end of the second branch pipe and the second pneumatic valve 44; the third pressure transmitter 9 is located between the vacuum pump pneumatic door 10 and the pebble coal slag bin 8; the fourth pressure transmitter 6 is located between the expansion joint 7 and the first end of the first branch pipe 2; the fifth pressure transmitter 23 is located between the first feeding branch pipe and the first manual valve 24; the sixth pressure transmitter 43 is located between the second feeding branch pipe and the second manual valve 44; the first slag box 13 and the second slag box 33 are both provided with a first temperature sensor 131 and a second temperature sensor 331; the first pebble coal feeder 15 and the second pebble coal feeder 35 are both provided with a frequency converter; the upper part of the pebble coal slag bin 8 is respectively provided with a third temperature sensor 81 and a level meter 82.

[0089] The first control unit 121 compares the pressure value measured by the first pressure transmitter 21 with the pressure value measured by the second pressure transmitter 41, and outputs a first alarm if they are not equal, indicating that the connecting part of the pipeline between the first branch pipe and the second branch pipe is blocked.

[0090] The second control unit 122 compares the pressures measured by the third pressure transmitter 9 and the fourth pressure transmitter 6. If the pressure measured by the third pressure transmitter 9 is lower than the pressure measured by the fourth pressure transmitter 6, a second alarm is output, indicating that the expansion joint 7 on the stone coal main pipe is damaged and negative pressure cannot be established.

[0091] The third control unit 123 compares the pressures measured by the first pressure transmitter 21 and the fifth pressure transmitter 23, and outputs a third alarm if the pressure measured by the first pressure transmitter 21 is lower than the pressure measured by the fifth pressure transmitter 23, indicating that the first branch pipe is blocked.

[0092] The fourth control unit 124 compares the pressure between the second pressure transmitter 41 and the sixth pressure transmitter 43, and if the pressure measured by the second pressure transmitter 41 is lower than the pressure measured by the sixth pressure transmitter 43, a fourth alarm is outputted, indicating that the second branch pipe is blocked.

[0093] The fifth control unit 125 is provided with a first parameter range. The fifth control unit 125 calculates the difference between the pressures measured by the third pressure transmitter 9 and the fifth pressure transmitter 23. If the difference is not within the first parameter range, the fifth alarm is output, indicating that the manual door of the first branch pipe is loose and falls off.

[0094] The sixth control unit 126 is provided with a second parameter range. The sixth control unit 126 calculates the difference between the pressure measured by the third pressure transmitter 9 and the pressure measured by the sixth pressure transmitter 43. If the difference is not within the second parameter range, the sixth alarm is output, indicating that the manual door of the second branch pipe is loose and falls off.

[0095] The seventh control unit 127 is provided with a temperature parameter threshold. The seventh control unit 127 compares the temperature measured by the first temperature sensor 131 with the temperature parameter threshold. If the temperature measured by the first temperature sensor 131 is greater than the temperature parameter threshold, the seventh alarm is output, indicating that the temperature of the stone coal slag box is too high and the slag discharge is not smooth, so as to avoid the consequences of stone coal ignition, expansion joint damage, stone coal slag bin sintering, etc. The seventh control unit 127 is also used to compare the temperature measured by the third temperature sensor 81 with the temperature parameter threshold. If the temperature measured by the third temperature sensor 81 is greater than the temperature parameter threshold, an alarm is output, indicating that the temperature of the stone coal slag box is too high and the expansion joint is damaged.

[0096] The eighth control unit 128 controls the frequency converter installed on the pebble coal feeder to set the rotation speed according to the type of raw coal, pebble coal and the operating status of the pulverizing system, thereby improving the transportation efficiency of the pebble coal system and reducing the blockage of the pebble coal system.

[0097] The beneficial effects of the implementation example of the present application are as follows: through the pebble coal system provided by the present application, the fault status of each pipeline of the pebble coal system is reflected through the interaction of the pressure transmitter, the temperature sensor and the control module, and when a fault occurs in the pipeline of the pebble coal system, an audible and visual alarm is issued; the operator is allowed to cut in and out the pebble coal device of a single pulverizing system according to the amount of coal, changes in coal type and the pebble coal content, and adjust the speed of the pebble coal feeder in real time to keep the pebble coal system in the best working condition.

[0098] In the several embodiments provided in the present application, it should be understood that the disclosed systems, modules and methods can be implemented in other ways. For example, the module embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, modules or units, which can be electrical, mechanical or other forms.

[0099] The above embodiments are only used to illustrate the technical solution of the present application, but not to limit it. The present application is not limited to the exact structure described above and illustrated in the accompanying drawings, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, various changes and modifications made without departing from the concept of the present application should be deemed to belong to the protection scope of the present application.

Claims

1. A pebble coal system, characterized in that: include: A first coal grinding subsystem (1), a second coal grinding subsystem (3), a first branch pipe (2), a second branch pipe (4), a pebble coal main pipe (5), a pebble coal slag bin (8), a vacuum pump (11), a first pressure transmitter (21), a second pressure transmitter (41) and a control module (12); each of the coal grinding subsystems comprises a coal grinding machine, a slag box and a feeder arranged on a feed branch pipe; each of the branch pipes is provided with a pneumatic valve and a manual valve; The pebble coal slag bin (8) is connected to the first end of the pebble coal main pipe (5); the vacuum pump (11) is connected to the pebble coal slag bin (8) to provide negative pressure; The first end of the first branch pipe (2) is connected to the pebble coal main pipe (5); the first pneumatic valve (22) on the first branch pipe is located on a side close to the first end of the first branch pipe; the first feed branch pipe in the first coal grinding subsystem (1) is connected to the first branch pipe on a side close to the first manual valve (24) on the first branch pipe; the first pressure transmitter (21) is located between the first end of the first branch pipe and the first pneumatic valve (22); The first end of the second branch pipe (4) is connected to the pebble coal main pipe (5) and is located on a side of the first branch pipe away from the pebble coal slag bin; the second pneumatic valve (42) on the second branch pipe (4) is located on a side close to the first end of the second branch pipe; the second feed branch pipe in the second coal grinding subsystem (3) is connected to the second branch pipe on a side close to the second manual valve (44) on the second branch pipe; the second pressure transmitter (41) is located between the first end of the second branch pipe and the second pneumatic valve (42); The control module (12) comprises a first control unit (121) for comparing the pressures measured by the first pressure transmitter (21) and the second pressure transmitter (41), and outputting a first alarm if the pressures are not equal.

2. The stone coal system according to claim 1, characterized in that: Also includes: A vacuum pump pneumatic valve (10), an expansion joint (7), a third pressure transmitter (9) and a fourth pressure transmitter (6); The vacuum pump pneumatic door (10) is located between the vacuum pump (11) and the stone and coal slag bin (8); the expansion joint (7) is located between the stone and coal slag bin (8) and the first end of the first branch pipe (2); The third pressure transmitter (9) is located between the vacuum pump pneumatic door (10) and the stone and slag bin (8); The fourth pressure transmitter (6) is located between the expansion joint (7) and the first end of the first branch pipe (2); The control module (12) further comprises a second control unit (122), wherein the second control unit (122) is used to compare the pressures measured by the third pressure transmitter (9) and the fourth pressure transmitter (6), and output a second alarm if the pressure measured by the third pressure transmitter (9) is lower than the pressure measured by the fourth pressure transmitter (6).

3. The stone coal system according to claim 2, characterized in that: Also includes: A fifth pressure transmitter (23) and a sixth pressure transmitter (43); The fifth pressure transmitter (23) is located between the first feed branch pipe and the first manual valve (24); the sixth pressure transmitter (43) is located between the second feed branch pipe and the second manual valve (44); The control module (12) further comprises a third control unit (123) and a fourth control unit (124); The third control unit (123) is used to compare the pressures measured by the first pressure transmitter (21) and the fifth pressure transmitter (23), and output a third alarm if the pressure measured by the first pressure transmitter (21) is lower than the pressure measured by the fifth pressure transmitter (23); The fourth control unit (124) is used to compare the pressure between the second pressure transmitter (41) and the sixth pressure transmitter (43), and output a fourth alarm if the pressure measured by the second pressure transmitter (41) is lower than the pressure measured by the sixth pressure transmitter (43).

4. The stone coal system according to claim 3, characterized in that: The control module (12) further comprises a fifth control unit (125) and a sixth control unit (126); The fifth control unit (125) is provided with a first parameter range, and the fifth control unit (125) is used to calculate the difference between the pressures measured by the third pressure transmitter (9) and the fifth pressure transmitter (23), and output a fifth alarm if the difference is not within the first parameter range; The sixth control unit (126) is provided with a second parameter range, and is used to calculate the difference between the pressure measured by the third pressure transmitter (9) and the pressure measured by the sixth pressure transmitter (43), and output a sixth alarm if the difference is not within the second parameter range.

5. The stone coal system according to claim 1, characterized in that: Also includes: A first slag discharge box (13); A first temperature sensor (131) is arranged in the first slag discharge box (13); The control module (12) further comprises a seventh control unit (127), wherein the seventh control unit (127) is provided with a temperature parameter threshold value, and the seventh control unit (127) is used to compare the temperature measured by the first temperature sensor (131) with the temperature parameter threshold value, and output a seventh alarm if the temperature measured by the first temperature sensor (131) is greater than the temperature parameter threshold value.

6. The stone coal system according to claim 1, characterized in that: Also includes: Stone coal feeder (15); The pebble coal feeder (15) is provided with a frequency converter; The frequency converter is used to control the rotation speed of the pebble coal feeder.

7. The stone coal system according to claim 6, characterized in that: The control module (12) further comprises an eighth control unit (128), wherein the eighth control unit (128) is used to control the frequency converter.

8. The stone coal system according to any one of claims 1 to 7, characterized in that: The control module is a distributed control system DCS.

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