CN114074020B - Control method, device and system for coal mill in thermal power generation system - Google Patents
Control method, device and system for coal mill in thermal power generation system Download PDFInfo
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- CN114074020B CN114074020B CN202010850471.7A CN202010850471A CN114074020B CN 114074020 B CN114074020 B CN 114074020B CN 202010850471 A CN202010850471 A CN 202010850471A CN 114074020 B CN114074020 B CN 114074020B
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- 239000003245 coal Substances 0.000 title claims abstract description 212
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000010248 power generation Methods 0.000 title claims abstract description 15
- 239000000446 fuel Substances 0.000 claims abstract description 68
- 230000009467 reduction Effects 0.000 claims abstract description 19
- 238000004590 computer program Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000003860 storage Methods 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000011451 sequencing strategy Methods 0.000 claims description 4
- 101100100125 Mus musculus Traip gene Proteins 0.000 description 57
- 238000002485 combustion reaction Methods 0.000 description 41
- 238000004422 calculation algorithm Methods 0.000 description 25
- 238000010586 diagram Methods 0.000 description 17
- 101100508818 Mus musculus Inpp5k gene Proteins 0.000 description 12
- 101100366438 Rattus norvegicus Sphkap gene Proteins 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 3
- 238000007726 management method Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009191 jumping Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 101150010867 DEFA gene Proteins 0.000 description 1
- 108700001191 DEFICIENS Proteins 0.000 description 1
- 238000012896 Statistical algorithm Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000007723 transport mechanism Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2201/00—Pretreatment of solid fuel
- F23K2201/10—Pulverizing
- F23K2201/1006—Mills adapted for use with furnaces
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Disintegrating Or Milling (AREA)
Abstract
The embodiment of the application discloses a control method, a device and a system of a coal mill in a thermal power generation system. The method comprises the steps that control modules are in one-to-one correspondence with coal mills in a fuel system, wherein each control module records a reference running state of a coal mill unit in a normal running state when tripping operation is allowed to be executed; wherein: the control module is used for judging whether the current nth skip grinding operation can be supported, judging whether the reference running state recorded in the control module comprises a real-time running state of the fuel system when the non-fuel auxiliary machine fault load reduction RB occurs or not when the judgment result is that the current nth skip grinding operation is supported, and controlling the connected coal mill to execute the skip grinding operation when the judgment result is that the real-time running state is included; wherein n=1, 2, &..; wherein N is an integer of 1 or more.
Description
Technical Field
The embodiment of the application relates to the field of information processing, in particular to a control method, a device and a system of a coal mill in a thermal power generation system.
Background
The fault load Reduction (RB) of the auxiliary machine means that when the actual power of the machine set is limited due to the fault tripping of the main auxiliary machine of the machine set, in order to adapt to the output of equipment, the control system forcedly reduces the load of the machine set to the maximum load which can be born by the auxiliary machine which is still running according to a certain speed. After RB occurs, the boiler side combustion system must have a function of quickly reducing heat to ensure that the load can be quickly reduced to the target load of the unit RB, so as to ensure that the unit load is stably and quickly reduced to the safe working condition.
After RB occurs, the control system cuts off the corresponding coal mill in a certain sequence and at certain time intervals according to the on-site combustion test and the data provided by the boiler manufacturer, so that the safe and stable operation of the unit is ensured. However, due to the fact that the skip grinding sequence or skip grinding time interval is wrong after the RB acts, the fuel quantity is unstable, primary air pressure fluctuation is large, the fuel quantity is unstable, and primary air fan surge can occur in severe cases. If the primary air pressure is reduced too much, the Fuel amount may be greatly reduced, and the boiler is caused to generate MFT (Main Fuel Trip); if the primary wind pressure is suddenly increased, the excessive coal dust entering the hearth instantaneously causes the explosion of the coal dust to happen. In addition, due to the fact that tripping sequence and time interval of the coal mill are wrong, the temperature of flue gas in the boiler can be reduced too much, the pressure in the boiler is reduced sharply, the combustion is greatly affected, the pressure in a hearth is reduced seriously, and the MFT of the boiler is caused. The incorrect skip sequence and time intervals are detrimental to the safe operation of the generator set.
Disclosure of Invention
In order to solve any technical problem, the embodiment of the application provides a control method, a device and a system of a coal mill in a thermal power generation system.
In order to achieve the purpose of the embodiment of the application, the embodiment of the application provides a control device of a coal mill in a thermal power generation system, which comprises control modules corresponding to the coal mills in a fuel system one by one, wherein each control module records a reference running state of a coal mill unit in a normal running state when tripping operation is allowed to be executed; wherein:
the control module is used for judging whether the current nth skip grinding operation can be supported, judging whether the reference running state recorded in the control module comprises a real-time running state of the fuel system when the non-fuel auxiliary machine fault load reduction RB occurs or not when the judgment result is that the current nth skip grinding operation is supported, and controlling the connected coal mill to execute the skip grinding operation when the judgment result is that the real-time running state is included;
wherein n=1, 2, &..; wherein N is an integer of 1 or more.
A control system for a coal pulverizer in a thermal power generation system, comprising:
the control device described above;
the management device comprises a recording module and n triggering modules, wherein each triggering module is used for triggering the skip grinding operation in the corresponding sequence; wherein:
the recording module is used for recording the running state of the coal mill unit in the fuel system in the normal running state to obtain the actual running state, wherein the actual running state comprises the real-time running state of the fuel system when the non-fuel auxiliary machine fault load reduction occurs;
and the first triggering module is used for sending the current actual running state of the coal mill unit to the control device when the non-fuel auxiliary machine fault load reduction RB occurs, and triggering the coal mill unit to execute the first skip grinding operation.
The ith triggering module is used for sending the current actual running state of the coal mill unit to the control device after the ith-1 grinding jumping operation is executed, and triggering the coal mill unit to execute the ith grinding jumping operation;
wherein i is an integer of 2 or more and N or less.
A control method of a coal mill in a thermal power generation system, which is applied to the system, comprising:
recording the running state of a coal mill unit in a fuel system under the normal running state to obtain an actual running state, wherein the actual running state comprises the real-time running state of the fuel system when a non-fuel auxiliary machine fault load reduction occurs;
when a non-fuel auxiliary machine fault load reduction RB occurs, determining a target tripping sequence table of a coal mill corresponding to the current actual running state of the coal mill unit according to a preset tripping sequence table;
and controlling the cutting sequence and the skip time interval of the coal mill according to the target tripping sequence table.
A storage medium having a computer program stored therein, wherein the computer program is arranged to perform the method described above when run.
An electronic device comprising a memory having stored therein a computer program and a processor arranged to run the computer program to perform the method described above.
One of the above technical solutions has the following advantages or beneficial effects:
the actual running state is obtained by recording the running state of the coal mill unit in the normal running state in the fuel system, when the non-fuel RB occurs, a target tripping sequence table of the coal mill corresponding to the running state of the current unit is determined according to a preset tripping sequence table, the cutting sequence and the tripping time interval of the coal mill are controlled according to the target tripping sequence table, and the tripping sequence and the interval time of the coal mill are ensured to be correct through control logic.
Additional features and advantages of embodiments of the application will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of embodiments of the application. The objectives and other advantages of the embodiments of the present application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the technical solutions of the embodiments of the present application, and are incorporated in and constitute a part of this specification, illustrate the technical solutions of the embodiments of the present application and not constitute a limitation to the technical solutions of the embodiments of the present application.
FIG. 1 is a flow chart of a control method of a coal mill in a thermal power generation system according to an embodiment of the present application;
FIG. 2 is a schematic circuit diagram of an operating state of a group combustion system during normal operation according to an embodiment of the present application;
FIG. 3 is a schematic diagram of the trip system of coal mill A in the circuit of FIG. 2;
FIG. 4 is a schematic diagram of the trip system of coal mill B in the circuit of FIG. 2;
FIG. 5 is a schematic diagram of the trip system of coal pulverizer C in the circuit of FIG. 2;
FIG. 6 is a schematic diagram of the trip system of coal pulverizer C in the circuit of FIG. 2;
FIG. 7 is a schematic diagram of the trip system of coal pulverizer G in the circuit of FIG. 2;
fig. 8 is a schematic diagram of the circuit shown in fig. 2-7.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the embodiments of the present application will be described in detail hereinafter with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be arbitrarily combined with each other.
Fig. 1 is a flowchart of a control method of a coal mill in a thermal power generation system according to an embodiment of the present application. Applied to the system described below, comprising:
step 101, recording the running state of a coal mill unit in a fuel system in a normal running state to obtain an actual running state, wherein the actual running state comprises a real-time running state of the fuel system when a non-fuel auxiliary machine fault is generated and the load is reduced;
102, when a non-fuel RB occurs, determining a target tripping sequence table of the coal mill corresponding to the running state of the current unit according to a preset tripping sequence table;
and 103, controlling the cutting sequence and the tripping time interval of the coal mill according to the target tripping sequence table.
According to the method provided by the embodiment of the application, through recording the running state of the coal mill unit in the normal running state in the fuel system, when the non-fuel RB occurs, the target tripping sequence table of the coal mill corresponding to the running state of the current unit is determined according to the preset tripping sequence table, the cutting sequence and the tripping time interval of the coal mill are controlled according to the target tripping sequence table, and the tripping sequence and the tripping time interval of the coal mill are ensured to be correct through the control logic.
The following describes the method provided in the embodiment of the present application:
aiming at the problem that a coal mill needs to be accurately cut off in the non-fuel RB production process of the thermal power generating unit, the method is accurate, simple and easy to implement. During normal operation of the thermal power generating unit, the combustion system of the unit is encoded in real time, when the non-fuel RB occurs, the encoding is latched, and the configuration logic represents the state of the combustion system of the unit by the encoding and is used for configuring the non-fuel RB tripping coal mill system logic so as to ensure that the tripping sequence and the interval time of the coal mill are correct.
In an exemplary embodiment, the recording the operation state of the coal mill unit in the fuel system in the normal operation state includes:
determining sequence information of each coal mill in a fuel system in a recording operation according to a preset sequencing strategy, and recording whether each coal mill is in an operating state or not through binary values to obtain a group of binary sequences;
converting the binary value into a decimal value to obtain real-time encoding of the running state;
and storing the real-time code of the running state as the running state of the coal mill unit to obtain the actual running state.
The method provided in the above exemplary embodiment is described, and the method includes:
1. a trip sequence table is listed. The order and time intervals for coal pulverizer removal when the non-fuel RB occurs are listed based on in-situ combustion tests and boiler manufacturer supplied data.
2. And (5) encoding the unit combustion system in real time. Assuming that the combustion system has A, B, C, D, E, F six coal mills which respectively represent one-bit binary number, taking the A coal mill as the 0 th bit, taking the B coal mill as the 1 st bit, … …, taking the F coal mill as the 5 th bit, then converting the 6-bit binary code into decimal code, acquiring the running state of the combustion system from a control system in real time, and coding according to the method to obtain the real-time code of the combustion system.
3. And acquiring the running state of the combustion system of the group at the normal running time. And (3) coding the combustion state of the unit in normal operation, and latching the decimal code when the non-fuel RB occurs, wherein the decimal code represents the operation state of the combustion system of the unit in normal operation.
4. Instructions to cut the coal mill are made according to a trip sequence table, and the time interval of each trip instruction.
5. And the trip logic of the coal mill is corresponding to the code configuration in the trip sequence table.
The method has the advantages that the mode of coding the combustion system is adopted, the state of the unit combustion system in normal operation is obtained, and the method can comprehensively and clearly represent the operation state of the unit combustion system; the binary sequence is utilized to record the running state of the coal mill unit, the realization is simple and convenient, the matching of the running state is judged by converting the binary value into the decimal value, and the processing efficiency is improved.
In one exemplary embodiment, the trip time interval is obtained by:
determining a part position at which the non-fuel RB occurs;
if the tripping time interval occurs on the blower or the induced draft fan, determining the tripping time interval as a first time interval;
if the tripping time interval occurs in the water feeding pump, the primary air blower or the air preheater, determining the tripping time interval as a second time interval;
wherein the first time interval is greater than the second time interval.
In the above exemplary embodiment, the first time interval may have a value of 10 seconds, and the second time interval may have a value of 5 seconds.
Different time intervals are set according to different part positions of the generated non-fuel RB, so that control operation can be more accurately and effectively finished.
The embodiment of the application provides a control system of coal pulverizer in thermal power generation system, include:
a control device;
the management device comprises a recording module and n triggering modules, wherein each triggering module is used for triggering tripping operation in a corresponding sequence; wherein:
the recording module is used for recording the running state of the coal mill unit in the fuel system in the normal running state to obtain the actual running state, wherein the actual running state comprises the real-time running state of the fuel system when the non-fuel auxiliary machine fault load reduction occurs;
and the first triggering module is used for sending the current actual running state of the coal mill unit to the control device when the non-fuel auxiliary machine fault load reduction RB occurs, and triggering the coal mill unit to execute a first tripping operation.
The ith triggering module is used for sending the current actual running state of the coal mill unit to the control device after the ith-1 trip operation is executed, and triggering the coal mill unit to execute the ith trip operation;
wherein i is an integer of 2 or more and N or less.
In an exemplary embodiment, the management apparatus further includes:
the time control module is used for determining the position of the part where the non-fuel RB occurs after the i-1 th trip operation is executed;
if the tripping time interval occurs on the blower or the induced draft fan, determining the tripping time interval as a first time interval;
if the tripping time interval occurs in the water feeding pump, the primary air blower or the air preheater, determining the tripping time interval as a second time interval;
wherein the first time interval is greater than the second time interval.
Taking a 1000MW unit as an example for illustration:
a1000 MW unit is provided with 7 coal mills, a field burner is arranged in a front-rear wall opposite-impact mode, the front wall is provided with four CDEG coal mills from the upper layer to the lower layer, the rear wall is provided with three BFA coal mills from the upper layer to the lower layer, the number of the configured coal mills is more and asymmetric, the combination modes of operation of different coal mills are different, and when RB is triggered, the order of the coal mill needing to be shut down and the order of shutdown coal mill are different.
1. Listing a trip sequence table: according to the data provided by the boiler manufacturer, the trip number, trip sequence and trip interval of the non-fuel RB are obtained when seven coal mills are operated simultaneously, six coal mills are operated simultaneously, and five coal mills are operated simultaneously in combination with the on-site combustion test, and are shown in the table 1.
TABLE 1
In Table 1, the number 1 indicates that when all coal mills are fully operated, four coal mills of the DEFA are reserved, the trip sequence is CBG when the feed pump RB is fed, and the trip sequence is GCB when other RBs occur.
And the number 2 indicates that when 6 coal mills are operated, A is not operated, BCDEF is operated, when RB occurs, four BDEF coal mills are reserved, and the tripping sequence is CG.
The other sequence numbers are similar.
2. Real-time coding is carried out on a unit combustion system: A. b, C, D, E, F, G seven coal mills respectively represent one-bit binary numbers, an A coal mill is used as a 0 th bit, a B coal mill is used as a 1 st bit, … … is used, a G coal mill is used as a 6 th bit, and then the 7-bit binary codes are converted into decimal codes.
In the normal operation state of the unit, the number 1 in table 1, seven coal mills all operate, and the binary code of the corresponding combustion system is 1111111 and then converted into the decimal code of 127.
Number 1 in table 1, when the unit is in normal operation, the coal mill a is stopped, and when the B, C, D, E, F, G six coal mills are operated, the binary code of the corresponding combustion system is 1111110, and then the binary code is converted into the decimal code 126 again.
Other sequence number encodings are similar.
3. And acquiring the running state of the combustion system of the group at the normal running time.
FIG. 2 is a schematic circuit diagram of an operating state of a group combustion system during normal operation according to an embodiment of the present application. As shown in FIG. 2, the combustion state of the unit in normal operation is encoded, when the non-fuel RB occurs, decimal encoding is latched to represent the operation state of the combustion system of the unit in normal operation, and an analog quantity selection algorithm block, which is framed by a dashed line box 1 at the lower part in the circuit shown in FIG. 2, is arranged at the first position of the logic page for execution, so that when the non-coal mill RB signal triggers, the analog quantity selection algorithm block immediately latches the state code of the combustion system of the unit in normal operation, and represents the state of the combustion system of the unit in normal operation.
4. The most commands to cut the coal mill are given according to the tripping sequence table 1, three tripping commands, the interval time of each tripping command is determined by which RB occurs,
as shown in fig. 2, when the blower/induced draft fan RB occurs, the trip interval is 10S, and the trip interval is 5S for the other RBs.
5. The trip logic for the coal mill is corresponding to the code configuration in trip sequence table 1.
6. And when RB occurs, the corresponding combustion system is jumped off according to the correct sequence and time interval, so that the system is ensured to be safely and quickly transited to a stable state.
7. The unit is designed with 7 medium-speed coal mills, 1 equipment is designed for 6, and 7 coal mills are all put into operation when the coal quality is poor. Assuming that the 1000MW unit is in full-load operation, two steam feed pumps, two induced draft fans, two blowers, two primary fans and two air pre-heaters are operated, 7 coal mills are in a 6-use 1-standby state, the A coal mill system is not operated, and the BCDEFG coal mill system is operated.
The control device of the coal mill in the thermal power generation system comprises control modules which are in one-to-one correspondence with the coal mills in the fuel system, wherein each control module records a reference running state of a coal mill unit in a normal running state when tripping operation is allowed to be executed; wherein:
the control module is used for judging whether the current nth trip operation can be supported, judging whether the reference running state recorded in the control module comprises a real-time running state of the fuel system when the non-fuel auxiliary machine fault load reduction RB occurs or not when the judgment result is that the current nth trip operation is supported, and controlling the connected coal mill to execute the trip operation when the judgment result is that the real-time running state is included;
wherein n=1, 2, &..; wherein N is an integer of 1 or more.
In an exemplary embodiment, each control module includes m control sub-modules, wherein different control sub-modules in the same control module are used for implementing different tripping sequences of the coal mill, and the reference running state of each control module includes a reference sub-running state of the coal mill unit in a normal running state when tripping operation is allowed to be performed recorded in each control sub-module; wherein:
the control module is used for determining a control submodule corresponding to the nth trip operation from m control submodules in the control module when the current nth trip operation can be supported, obtaining a target control submodule, and judging whether the real-time running state of the fuel system when the non-fuel auxiliary machine fault load reduction RB occurs in the received actual running state is consistent with the reference running state recorded in the target control submodule; if the two types of the tripping operation are consistent, executing the tripping operation;
wherein m is an integer less than or equal to N.
In one exemplary embodiment, the reference operating state is recorded by the following means, including:
determining sequence information of each coal mill in a fuel system in a recording operation according to a preset sequencing strategy, and recording whether each coal mill is in an operating state or not through binary values to obtain a group of binary sequences;
converting the binary value into a decimal value to obtain a reference running state of the coal mill;
and determining a used threshold range according to the reference running state of the coal mill to obtain the reference running state.
Fig. 3 is a schematic diagram of the trip system of coal mill a in the circuit of fig. 2. As shown in fig. 3, in the trip sequence table 1, the number of the cut coal mill a is numbered 5, 20, and 28. The serial number 5 is that the coal mill A is jumped off when the second coal mill is jumped off, and the code is 119; the serial number 20 is that the coal mill A is jumped off when the first coal mill is jumped off, and the code is 115; the number 28 is the number 47, which indicates that the coal mill A is tripped when the first coal mill is tripped. Based on the high and low limit monitoring algorithm, the input coal mill operation code is checked according to given high and low limit values. The output switching amount is 1 if the input is equal to or exceeds the high limit value, or is equal to or below the low limit value, otherwise is 0. A high and low limit algorithm is used to encode the corresponding combustion system operation.
And the serial number 5 is used for stopping the operation D in normal operation, the BEFGCA is used for operating, the coal mill operation code is 119, 118.9<119<119.1, the output of a third high-low limit algorithm block in the figure 2 is 0, the output of the third high-low limit algorithm block is 1 after the third high-low limit algorithm block is inverted, and the coal mill A is tripped after the second grinding instruction is jumped with the upper RB, as shown in the figure 3.
The serial number 20, CD is stopped during normal operation, BEFGA is operated, the coal mill operation code is 115, 114.9<115<115.1, the output of the first high-low limit algorithm block in figure 2 is 0, 1 after the output is reversed, and the coal mill A is tripped after the first grinding instruction is jumped with the upper RB, as shown in figure 3.
And the number 28, EG is stopped in normal operation, CBDFA is operated, the coal mill operation code is 47, 46.9<47<47.1, the output of the second high-low limit algorithm block in the figure 2 is 0, 1 after the output is inverted, and the coal mill A is tripped after the first grinding instruction is jumped with the upper RB, as shown in figure 3.
Fig. 4 is a schematic diagram of the trip system of coal mill B in the circuit of fig. 2. As shown in fig. 4, a trip system diagram of coal mill B. In the trip sequence table 1, the numbers of the coal pulverizer B are cut out to be number 1, number 4, number 6, number 7, number 8, number 21, number 22, number 23, number 24, and number 26. When the water pump RB in the sequence number 1 is used, the B coal mill is jumped off when the second coal mill is jumped off, and the sequence number is 127; when the water pump RB is not in the sequence number 1, the B coal mill is jumped off when the third coal mill is jumped off, and the sequence number is 127; the number 4, the number 21, the number 22, the number 23, the number 24 and the number 26 are respectively 123, 107, 91, 59, 103 and 55 when the number B coal mill is jumped off when the number 26 is jumped off the first coal mill; and when the serial numbers 6, 7 and 8 are the second coal mill, the B coal mill is jumped off, and the codes are 111, 95 and 63 respectively. The coal mill operation code is checked according to given high and low limit values. The output switching amount is 1 if the input is equal to or exceeds the high limit value, or is equal to or below the low limit value, otherwise is 0. Similar to the trip system of coal mill a, a high and low limit algorithm is used to correspond to the combustion system operation code. The trip system of coal mill B is configured as shown in fig. 4.
Fig. 5 is a schematic diagram of the trip system of coal pulverizer C in the circuit of fig. 2. As shown in fig. 5, a trip system diagram of coal mill C. In the trip sequence table 1, the cut coal mill C has the numbers 1,2, 3, 5, 6, 7, 8, 9, 11, 14, 17, 18, 19, 25, 27, and 29. When the water feeding pump RB in the sequence number 1 is used, the C coal mill is jumped off when the first coal mill is jumped off, and the sequence number is 127; when the water pump RB is not used in the sequence number 1, the C coal mill is jumped off when the second coal mill is jumped off, and the sequence number is 127; the codes of the coal mills C are 126, 125, 119, 111, 95, 63, 124, 118, 62, 109, 93, 61, 87, 79 and 31 when the first coal mill is jumped, and the number 2, 3, 5, 6, 7, 8, 9, 11, 14, 17, 18, 19, 25, 27 and 29. The trip system of coal mill C is configured with a high and low limit algorithm to correspond to the combustion system operation code, as shown in fig. 4.
Fig. 6 is a schematic diagram of the trip system of coal pulverizer C in the circuit of fig. 2. As shown in fig. 6, in the trip sequence table 1, the number of the coal pulverizer D is cut off, and the number is 10. The code number 10 is 122 when the D coal mill is jumped off when the first coal mill is jumped. The trip system of coal pulverizer D is configured with a high and low limit algorithm to correspond to the combustion system operation code, as shown in fig. 6.
Fig. 7 is a schematic diagram of the trip system of coal pulverizer G in the circuit of fig. 2. As shown in fig. 7, a trip system diagram of coal mill G. In the trip sequence table 1, the cut coal mill G has the numbers 1,2, 3, 4, 12, 13, 15, and 16. When the water feeding pump RB in the sequence number 1 is used, the G coal mill is jumped off when the third coal mill is jumped off, and the sequence number is 127; when the water pump RB is not used in the sequence number 1, the G coal mill is jumped off when the first coal mill is jumped off, and the sequence number is 127; the G coal mill is jumped off when the serial numbers 2 and 3 are the second coal mill, and the codes are 126 and 125 respectively; the codes of the G coal mills are 110, 94, 121 and 117 respectively when the serial numbers 12, 13, 15 and 16 are the first coal mill. The trip system of coal mill G is configured with a high and low limit algorithm to correspond to the combustion system operation code, as shown in fig. 7.
Based on the above structure, a specific application scenario is taken as an example for explanation:
under the working condition, the automatic tripping control operation of the thermal power production process RB can encode the combustion state of the unit in normal operation according to FIG. 2, the operation state of the unit combustion system in normal operation is obtained, and the operation code of the coal mill obtained at the moment is 126.
At this time, a failure of one steam feed pump stops, and the feed pump RB occurs, and the automatic tripping control method of the thermal power production process RB can latch the obtained operation code of the coal mill according to fig. 2, which represents the operation state of the combustion system of the group in normal operation, and the latched operation code of the coal mill is 126. And when the operation code of the coal mill is latched, an RB jump first mill command is sent.
The RB skip first grinding instruction is simultaneously sent to the fig. 3 coal mill a tripping system, the fig. 4 coal mill B tripping system, the fig. 5 coal mill C tripping system, the fig. 6 coal mill D tripping system, the fig. 7 coal mill G tripping system, and then the RB skip C grinding instruction is sent to the C coal mill operating system to skip the C coal mill when the 10 th high-low limit algorithm ("124.9 to 127.1") in the fig. 5 coal mill C tripping system is met, as can be seen from the analysis of fig. 3 to 7, along with the coal mill operation code 126 latched when the feed pump RB occurs.
According to the method for controlling the automatic tripping of the RB in the thermal power production process, according to FIG. 1, after the water feeding pump RB instantaneously jumps off the running system of the C coal mill, the automatic tripping time interval of the RB in the thermal power production process is 5S, and after the interval of 5S, an RB jump second grinding instruction is sent.
The RB trip second grinding instruction is simultaneously sent to the tripping system of the coal mill a in fig. 3, the tripping system of the coal mill B in fig. 4, the tripping system of the coal mill C in fig. 5, the tripping system of the coal mill D in fig. 6 and the tripping system of the coal mill G in fig. 7, and then the RB trip second grinding instruction is compared with the coal mill operation code 126 latched when the feed pump RB occurs, as can be seen from analysis of fig. 3 and 3 to 7, only the 5 th high-low limit algorithm in the tripping system of the coal mill G in fig. 7 is met, and the RB trip G grinding instruction is sent to the coal mill operation system G at this time to trip the coal mill G.
When the feed pump RB occurs, the C mill system needs to be tripped immediately, and the G mill system needs to be tripped after the interval of 5S, as indicated by the number 2 in the trip sequence table 1. The RB automatic tripping control method in the thermal power production process completely meets the tripping sequence table requirement.
Fig. 8 is a schematic diagram of the circuit shown in fig. 2-7. As shown in fig. 8, the icons in fig. 8 include:
1. high limit monitoring algorithm: if the input is equal to or exceeds the high limit value, the output switching value is 1, otherwise, the output switching value is 0;
2. high-low limit monitoring algorithm: the algorithm checks the input analog quantity according to a given high and low limit value; if the input is equal to or exceeds the high limit value or is equal to or lower than the low limit value, the output switching value is 1, otherwise, the output switching value is 0;
3. analog quantity switching selection algorithm: the algorithm has two analog input ends, one switch input end and one analog output end; determining which of the two analog inputs is taken as output according to the value of the switching value input end;
4. switching value state statistical algorithm: the algorithm checks the switching value state of each connected input end, and counts the number of switching values with the ON state;
5. GP is converted into an analog quantity algorithm: converting the numerical value of the input GP point into an integer, and assigning the integer to an analog output point; for example, the value of GP is 0X14,0X14 which is hexadecimal, expressed by binary as 00010100, converted into decimal number as 20, and the value of the output point of the algorithm is 20.0;
6. GP point combining algorithm: the algorithm accepts up to 16 switching value inputs and outputs a GP point. The upper left corner connection point of the icon is the 1 st input; the lower left corner is the 16 th input corresponding to bit0 of the output GP, and bit15 corresponding to the output GP. The method provided by the embodiment of the application has the following advantages:
the scheme provided by the embodiment of the application has the following advantages that:
1. the tripping system adopts a mode of coding the combustion system to acquire the state of the unit combustion system when in normal operation, and the method can comprehensively and clearly represent the operation state of the unit combustion system.
2. The tripping system cuts off a plurality of coal mills and configures corresponding tripping instructions in a layered and hierarchical mode.
3. The tripping system is considered for each coal mill respectively, and when one coal mill tripping system needs to be modified, only the corresponding tripping system needs to be modified, and other coal mill tripping systems do not need to be considered.
4. The trip system has wide applicability and is applicable to the combustion system of the thermal power plant with any configuration.
5. The trip system adopts a structural configuration mode, the thought is clear, and particularly for a complex combustion system, the trip system can be accurately built only by listing a corresponding trip sequence table according to the requirement, so that the safe and stable transition to a stable working condition is ensured when the RB occurs in the unit.
Embodiments of the present application provide a storage medium having a computer program stored therein, wherein the computer program is arranged to perform the method described in any of the above when run.
An embodiment of the application provides an electronic device comprising a memory having stored therein a computer program and a processor arranged to run the computer program to perform the method as described in any of the preceding claims.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, functional modules/units in the apparatus, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between the functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed cooperatively by several physical components. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.
Claims (9)
1. The control device of the coal mill in the thermal power generation system comprises control modules which are in one-to-one correspondence with the coal mill in the fuel system, wherein each control module records a reference running state of the coal mill unit in a normal running state when tripping operation is allowed to be executed; the control system comprises a coal mill unit, a control module, a tripping operation control module and a tripping operation control module, wherein each control module comprises m control sub-modules, wherein different control sub-modules in the same control module are used for realizing different tripping sequences of the coal mill, and the reference running state of each control module comprises a reference sub-running state of the coal mill unit in a normal running state when tripping operation is allowed to be executed, which is recorded in each control sub-module; wherein:
the control module is used for judging whether the current n-th tripping operation can be supported, judging whether the reference running state recorded in the control module comprises the real-time running state of the fuel system when the non-fuel auxiliary machine fault load reduction occurs when the judgment result is that the current n-th tripping operation is supported, determining the control submodule corresponding to the n-th tripping operation from m control submodules in the control module when the judgment result is that the real-time running state of the fuel system when the non-fuel auxiliary machine fault load reduction occurs is included, obtaining a target control submodule, and judging whether the reference running state recorded in the target control submodule is consistent with the real-time running state of the fuel system when the non-fuel auxiliary machine fault load reduction occurs in the received actual running state; if the judging result is consistent, executing tripping operation;
wherein n=1, 2, &..; wherein N is an integer greater than or equal to 1, and m is an integer less than or equal to N.
2. The apparatus of claim 1, wherein the reference operating state recorded in the control module is recorded by:
determining sequence information of each coal mill in a fuel system in a recording operation according to a preset sequencing strategy, and recording whether each coal mill is in an operating state or not through binary values to obtain a group of binary sequences;
converting the binary value into a decimal value to obtain a reference running state of the coal mill;
and determining a used threshold range according to the reference running state of the coal mill to obtain the reference running state.
3. A control system for a coal pulverizer in a thermal power generation system, comprising:
the control device according to claim 1 or 2;
the management device comprises a recording module and n triggering modules, wherein each triggering module is used for triggering tripping operation in a corresponding sequence; wherein:
the recording module is used for recording the running state of the coal mill unit in the fuel system in the normal running state to obtain the actual running state, wherein the actual running state comprises the real-time running state of the fuel system when the non-fuel auxiliary machine fault load reduction occurs;
the first triggering module is used for sending the current actual running state of the coal mill unit to the control device when the non-fuel auxiliary machine fault load reduction occurs, and triggering the coal mill unit to execute a first tripping operation;
the ith triggering module is used for sending the current actual running state of the coal mill unit to the control device after the ith-1 trip operation is executed, and triggering the coal mill unit to execute the ith trip operation;
wherein i is an integer of 2 or more and N or less.
4. A system according to claim 3, wherein the management means further comprises:
the time control module is used for determining the position of a part where the fault load reduction of the non-fuel auxiliary machine occurs after the i-1 th trip operation is executed;
if the tripping time interval occurs on the blower or the induced draft fan, determining the tripping time interval as a first time interval;
if the tripping time interval occurs in the water feeding pump, the primary air blower or the air preheater, determining the tripping time interval as a second time interval;
wherein the first time interval is greater than the second time interval.
5. A control method of a coal mill in a thermal power generation system, applied to the system as claimed in claim 3 or 4, comprising:
recording the running state of a coal mill unit in a fuel system under the normal running state to obtain an actual running state, wherein the actual running state comprises the real-time running state of the fuel system when a non-fuel auxiliary machine fault load reduction occurs;
when the non-fuel auxiliary machine fault load reduction occurs, determining a target tripping sequence table of the coal mill corresponding to the current actual running state of the current coal mill unit according to a preset tripping sequence table;
and controlling the cutting sequence and the tripping time interval of the coal mill according to the target tripping sequence table.
6. The method of claim 5, wherein the recording the operating condition of the coal mill unit in the fuel system in the normal operating condition comprises:
determining sequence information of each coal mill in a fuel system in a recording operation according to a preset sequencing strategy, and recording whether each coal mill is in an operating state or not through binary values to obtain a group of binary sequences;
converting the binary value into a decimal value to obtain real-time encoding of the running state;
and storing the real-time code of the running state as the running state of the coal mill unit in the normal running state to obtain the actual running state.
7. The method according to claim 5 or 6, wherein the trip time interval is obtained by:
determining a component position at which the non-fuel auxiliary machine fault load shedding occurs;
if the tripping time interval occurs on the blower or the induced draft fan, determining the tripping time interval as a first time interval;
if the tripping time interval occurs in the water feeding pump, the primary air blower or the air preheater, determining the tripping time interval as a second time interval;
wherein the first time interval is greater than the second time interval.
8. A storage medium having a computer program stored therein, wherein the computer program is arranged to perform the method of any of claims 5 to 7 when run.
9. An electronic device comprising a memory and a processor, characterized in that the memory has stored therein a computer program, the processor being arranged to run the computer program to perform the method of any of the claims 5 to 7.
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| EP2058590A1 (en) * | 2007-11-09 | 2009-05-13 | ALSTOM Technology Ltd | Method for operating a burner |
| CN101650021A (en) * | 2009-08-25 | 2010-02-17 | 广州粤能电力科技开发有限公司 | Primary air fan tripping set run back control method and system |
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