CN113375187A - Coal supply amount overshoot method for reducing variable load process of coal-fired unit and related components - Google Patents
Coal supply amount overshoot method for reducing variable load process of coal-fired unit and related components Download PDFInfo
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- CN113375187A CN113375187A CN202110705084.9A CN202110705084A CN113375187A CN 113375187 A CN113375187 A CN 113375187A CN 202110705084 A CN202110705084 A CN 202110705084A CN 113375187 A CN113375187 A CN 113375187A
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- 238000000034 method Methods 0.000 title claims abstract description 76
- 239000003245 coal Substances 0.000 title claims abstract description 67
- 230000008569 process Effects 0.000 title claims abstract description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000012937 correction Methods 0.000 claims abstract description 31
- 238000003303 reheating Methods 0.000 claims abstract description 19
- 238000003860 storage Methods 0.000 claims abstract description 14
- 230000007613 environmental effect Effects 0.000 claims abstract description 6
- 239000000779 smoke Substances 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 22
- 238000004590 computer program Methods 0.000 claims description 9
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 5
- 239000003546 flue gas Substances 0.000 claims description 5
- 230000009467 reduction Effects 0.000 abstract description 12
- 239000000446 fuel Substances 0.000 abstract description 8
- 239000002699 waste material Substances 0.000 abstract description 4
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 238000011946 reduction process Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004883 computer application Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/002—Regulating fuel supply using electronic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2239/00—Fuels
- F23N2239/02—Solid fuels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2241/00—Applications
- F23N2241/10—Generating vapour
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention discloses a coal supply overshoot method for reducing the variable load process of a coal-fired unit, which comprises the following steps: extracting the reheating temperature-reducing water flow and the boiler smoke temperature of the boiler in the variable load process of the coal-fired unit; comparing the value of the boiler reheating desuperheating water flow target rod corresponding to the load at the current environment temperature with the value of the boiler exhaust gas temperature target rod to obtain a consumption difference value; and acquiring a coal-fired quantity overshoot correction value according to the consumption difference value and the standard coal consumption corresponding to the load at the current environmental temperature, and applying the coal-fired quantity overshoot correction value to the unit load instruction to correct the coal-fired quantity instruction of the coal-fired unit. Therefore, the coal quantity is corrected, the problem of energy waste caused by fuel quantity overshoot is further reduced, and the requirements of energy conservation and emission reduction can be met. Correspondingly, the invention also discloses a coal supply quantity overshoot reduction device, equipment and a readable storage medium for the coal supply quantity overshoot reduction process of the coal-fired unit, which correspond to the coal supply quantity overshoot reduction method for the variable load process of the coal-fired unit, and the device, the equipment and the readable storage medium have the technical effects and are not described again.
Description
Technical Field
The invention relates to the field of thermal power generation, in particular to a method, a device, equipment and a readable storage medium for reducing coal supply overshoot in a variable load process of a coal-fired unit.
Background
With the development of new energy electric power, the instability and the volatility of a power grid are increased, wherein a coal-fired unit generally participates in peak shaving and frequency modulation of the power grid, so that the coal-fired unit is often in a variable load process, the production state of the coal-fired unit is stable state and variable load operation change, and the coal-fired unit is constantly in the variable load process.
At present, a coal-fired unit is controlled by adopting a coordination control system. The variable load operation of the unit is realized by adjusting the boiler, the coal feeding amount, the water feeding amount, a high-pressure steam adjusting valve at the steam turbine side and the like. However, because the boiler has delay and large inertia, and the steam turbine side has fast response, in the variable load control process, coal feeding energy is often larger than water feeding and steam heat absorption energy, so that a large amount of superheater desuperheating water and reheater desuperheating water are operated by a unit, the exhaust gas temperature is increased, and the boiler efficiency and the unit efficiency are reduced.
Disclosure of Invention
The invention aims to provide a method, a device, equipment and a readable storage medium for reducing coal quantity overshoot in the variable load process of a coal-fired unit, which can reduce the problem of resource waste caused by fuel quantity overshoot.
In order to solve the technical problems, the invention provides the following technical scheme:
a coal supply quantity overshoot method for reducing the variable load process of a coal-fired unit comprises the following steps:
extracting the reheating temperature-reducing water flow and the boiler smoke temperature of the boiler in the variable load process of the coal-fired unit;
comparing the target value of the flow of the reheated desuperheating water of the boiler and the target value of the exhaust gas temperature of the boiler corresponding to the load at the current environmental temperature according to the flow of the reheated desuperheating water of the boiler and the exhaust gas temperature of the boiler to obtain a consumption difference value;
and acquiring a coal-fired quantity overshoot correction value according to the consumption difference value and the standard coal consumption corresponding to the load at the current environmental temperature so as to correct the coal-fired quantity instruction of the coal-fired unit.
Optionally, the boiler reheat attemperation water flow comprises a boiler reheater attemperation water flow.
Optionally, the consumption difference value is calculated by the following formula: Δ b ═ a1 (D)zrj-D′zrj)+a2(tpy-t′py) Wherein, delta b is consumption difference value, a1 is boiler reheating temperature-reducing water flow consumption difference coefficient, a2 is boiler flue gas temperature consumption difference coefficient, DzrjFor boiler reheat attemperation water flow, D'zrjBenchmarking value, t, for boiler reheat desuperheating water flowpyIs the temperature of the exhaust gas of the boiler, t'pyBoiler exhaust gas temperature benchmarking value.
Optionally, the coal-fired amount overshoot correction value is calculated by the following formula: k is 1-delta b/b0K is a coal combustion amount overshoot correction value, b0The standard coal consumption.
Optionally, the coal-fired quantity overshoot correction value is applied to the unit load instruction and multiplied by the unit load instruction, so that the unit fuel quantity instruction is corrected.
Optionally, the coal-fired quantity command is further corrected by a main steam pressure correction value.
Optionally, the coal-burning amount command is further corrected by a variable load feed-forward value and/or a coal quality correction value.
A coal supply quantity overshoot device for reducing the variable load process of a coal-fired unit comprises:
the data acquisition unit is used for extracting the reheating and temperature-reducing water flow of the boiler and the exhaust gas temperature of the boiler in the variable load process of the coal-fired unit;
the consumption difference value calculation unit is used for comparing the boiler reheating and temperature reducing water flow target value and the boiler exhaust gas temperature target value corresponding to the load at the current environment temperature according to the boiler reheating and temperature reducing water flow and the boiler exhaust gas temperature so as to obtain a consumption difference value;
and the coal-fired quantity overshoot correction value calculation unit is used for obtaining a coal-fired quantity overshoot correction value according to the consumption difference value and the standard coal consumption corresponding to the load at the current ambient temperature so as to correct the coal-fired quantity instruction of the coal-fired unit.
A coal supply amount overshoot equipment for reducing variable load process of a coal-fired unit comprises:
a memory for storing a computer program;
and the processor is used for realizing the steps of the coal supply overshoot method for reducing the variable load process of the coal-fired unit when executing the computer program.
A readable storage medium having stored thereon a computer program that, when executed by a processor, performs the steps of the above-described method for reducing coal supply overshoot during a variable load process for a coal-fired unit.
Compared with the prior art, the technical scheme has the following advantages:
a method for reducing coal supply overshoot in a variable load process of a coal-fired unit can calculate energy loss in the variable load process of the coal-fired unit, can monitor the energy loss condition in the variable load process in real time, then obtains a coal combustion amount overshoot correction value according to a consumption difference value, and introduces the coal combustion amount overshoot correction value into a coal combustion amount command to correct the coal combustion amount, so that the energy waste problem caused by fuel amount overshoot is reduced, and the requirements of energy conservation and emission reduction can be met.
Correspondingly, the invention also provides a coal supply quantity overshoot reduction device, equipment and a readable storage medium for the coal supply quantity overshoot reduction process of the coal-fired unit, which correspond to the coal supply quantity overshoot reduction process of the coal-fired unit, and the coal supply quantity overshoot reduction device, equipment and the readable storage medium have the technical effects and are not described again.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow diagram of a coal-fired unit boiler;
FIG. 2 is a flow chart of a method for reducing overshoot of coal supply during a variable load process of a coal-fired unit according to an embodiment of the present invention;
FIG. 3 is a schematic representation of a fuel quantity command for a coal fired unit.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be implemented in a number of ways different from those described herein and similar generalizations can be made by those skilled in the art without departing from the spirit of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
Referring to fig. 1, fig. 1 is a schematic view of a working flow of a coal-fired unit boiler. High-temperature flue gas generated by combustion in the hearth 1 passes through the high-temperature superheater 2 and the high-temperature reheater 3 to heat main steam and reheated steam, enters the low-temperature superheater 4 and the low-temperature reheater 5 to heat superheated steam and high-pressure cylinder exhaust steam of a boiler, then flows through the economizer 6 and the air preheater 7 to become boiler exhaust smoke, and enters the tail flue gas treatment system 8. Wherein the high-pressure cylinder exhaust steam is firstly heated in the low-temperature reheater 5 and then enters the high-temperature reheater 3 to be heated to the given temperature of the reheat steam, and when the temperature of the reheat steam is higher than a set value, the reheater desuperheating water can be put into operation to reduce the temperature of the reheat steam.
Referring to fig. 2, fig. 2 is a flowchart of a method for reducing coal supply overshoot in a variable load process of a coal-fired unit according to an embodiment of the present invention, the method includes the following steps:
s100: and extracting the reheating temperature-reducing water flow and the boiler smoke temperature of the boiler in the variable load process of the coal-fired unit. The relevant data can be detected in real time by a corresponding temperature sensor.
S200: and comparing the boiler reheating temperature-reducing water flow target value and the boiler exhaust gas temperature target value corresponding to the load at the current environment temperature according to the boiler reheating temperature-reducing water flow and the boiler exhaust gas temperature to obtain a consumption difference value. Wherein the loss difference value can be calculated by the following formula：Δb＝a1(Dzrj-D′zrj)+a2(tpy-t′py) Wherein, delta b is consumption difference value, a1 is boiler reheating temperature-reducing water flow consumption difference coefficient, a2 is boiler flue gas temperature consumption difference coefficient, DzrjFor boiler reheat attemperation water flow, D'zrjBenchmarking value, t, for boiler reheat desuperheating water flowpyIs the temperature of the exhaust gas of the boiler, t'pyBoiler exhaust gas temperature benchmarking value.
S300: and acquiring a coal-fired quantity overshoot correction value according to the consumption difference value and the standard coal consumption corresponding to the load at the current environmental temperature so as to correct the coal-fired quantity instruction of the coal-fired unit. Wherein, the coal burning quantity overshoot correction value is calculated by the following formula: k is 1-delta b/b0K is a coal combustion amount overshoot correction value, b0The standard coal consumption. And the coal burning amount overshoot correction value is applied to the unit load instruction and multiplied by the instruction, so that the unit fuel amount instruction is corrected.
According to the method, the energy loss in the variable load process of the coal-fired unit can be calculated, the energy loss condition in the variable load process can be monitored in real time, the coal-fired quantity overshoot correction value is obtained according to the consumption difference value, and the coal-fired quantity overshoot correction value is introduced into the coal-fired quantity instruction to correct the coal-fired quantity, so that the energy waste problem caused by fuel quantity overshoot is reduced, and the requirements of energy conservation and emission reduction can be met.
Referring to fig. 3, fig. 3 is a schematic diagram of a fuel quantity instruction of a coal-fired unit, where the coal-fired quantity instruction may be corrected by at least one of a main steam pressure correction value, a variable load feed-forward value, and a coal quality correction value, in addition to the above coal-fired quantity overshoot correction value, and the specific correction principle may refer to the prior art, and is not described herein again.
Corresponding to the above method embodiment, the embodiment of the present invention further provides a coal supply overshoot reduction device in the variable load process of the coal-fired unit, and the coal supply overshoot reduction device in the variable load process of the coal-fired unit described below and the coal supply overshoot reduction method in the variable load process of the coal-fired unit described above may be referred to correspondingly.
A coal supply quantity overshoot device for reducing the variable load process of a coal-fired unit comprises:
the data acquisition unit is used for extracting the reheating and temperature-reducing water flow of the boiler and the exhaust gas temperature of the boiler in the variable load process of the coal-fired unit;
the consumption difference value calculation unit is used for comparing a boiler reheating and temperature reducing water flow benchmark value and a boiler exhaust gas temperature benchmark value corresponding to the load at the current environment temperature according to the boiler reheating and temperature reducing water flow and the boiler exhaust gas temperature so as to obtain a consumption difference value;
and the coal-fired quantity overshoot correction value calculation unit is used for obtaining the coal-fired quantity overshoot correction value according to the consumption difference value and the standard coal consumption corresponding to the load at the current ambient temperature so as to correct the coal-fired quantity instruction of the coal-fired unit.
Corresponding to the above method embodiment, the embodiment of the present invention further provides a coal supply amount overshoot device in the variable load process of the coal-fired unit, and the coal supply amount overshoot device in the variable load process of the coal-fired unit described below and the coal supply amount overshoot method in the variable load process of the coal-fired unit described above may be referred to correspondingly.
A coal supply amount overshoot equipment for reducing variable load process of a coal-fired unit comprises:
a memory for storing a computer program;
and the processor is used for realizing the steps of the coal supply overshoot method for reducing the variable load process of the coal-fired unit when executing the computer program.
The coal-amount overshoot equipment for reducing the variable load process of the coal-fired unit can generate larger difference due to different configurations or performances, and can comprise one or more processors (CPUs) (for example, one or more processors) and a memory, wherein the memory stores one or more computer application programs or data. Wherein the memory may be transient or persistent. The program stored in the memory may include one or more modules (not shown), each of which may include a sequence of instructions operating on the data processing apparatus. Further, the processor may be configured to communicate with the memory to execute a series of instruction operations in the memory on the coal over-rating device during a reduction of a variable load on the coal-fired unit.
Corresponding to the above method embodiment, the embodiment of the present invention further provides a readable storage medium, and a readable storage medium described below and the above coal supply overshoot reduction method in the variable load process of the coal-fired unit can be correspondingly referred to each other.
A readable storage medium having stored thereon a computer program that, when executed by a processor, performs any of the above-described steps of the method for reducing coal overshoot during a variable load process of a coal-fired unit.
The readable storage medium may be a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and various other readable storage media capable of storing program codes.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
Claims (8)
1. A coal supply quantity overshoot method for reducing the variable load process of a coal-fired unit is characterized by comprising the following steps:
extracting the reheating temperature-reducing water flow and the boiler smoke temperature of the boiler in the variable load process of the coal-fired unit;
comparing the target value of the flow of the reheated desuperheating water of the boiler and the target value of the exhaust gas temperature of the boiler corresponding to the load at the current environmental temperature according to the flow of the reheated desuperheating water of the boiler and the exhaust gas temperature of the boiler to obtain a consumption difference value;
and acquiring a coal-fired quantity overshoot correction value according to the consumption difference value and the standard coal consumption corresponding to the load at the current environmental temperature so as to correct the coal-fired quantity instruction of the coal-fired unit.
2. The method for reducing coal supply overshoot during variable load process of a coal-fired unit according to claim 1, wherein the consumption difference value is calculated by the following formula: Δ b ═ a1 (D)zrj-D′zrj)+a2(tpy-t′py) Wherein, delta b is consumption difference value, a1 is boiler reheating temperature-reducing water flow consumption difference coefficient, a2 is boiler flue gas temperature consumption difference coefficient, DzrjFor boiler reheat attemperation water flow, D'zrjBenchmarking value, t, for boiler reheat desuperheating water flowpyIs the temperature of the exhaust gas of the boiler, t'pyBoiler exhaust gas temperature benchmarking value.
3. The method for reducing the coal supply overshoot during the variable load process of the coal-fired unit according to claim 2, wherein the coal supply overshoot correction value is calculated by the following formula: k is 1-delta b/b0K is a coal combustion amount overshoot correction value, b0The standard coal consumption.
4. The method of claim 1, wherein the coal-fired quantity command is further modified by a main steam pressure correction value.
5. The method for reducing coal supply overshoot in the variable load process of the coal-fired unit as claimed in claim 1, wherein the coal-fired quantity command is further modified by a variable load feed-forward value and/or a coal quality correction value.
6. The utility model provides a reduce coal-fired unit and become load process and give coal volume overshoot device which characterized in that includes:
the data acquisition unit is used for extracting the reheating and temperature-reducing water flow of the boiler and the exhaust gas temperature of the boiler in the variable load process of the coal-fired unit;
the consumption difference value calculation unit is used for comparing the boiler reheating and temperature reducing water flow target value and the boiler exhaust gas temperature target value corresponding to the load at the current environment temperature according to the boiler reheating and temperature reducing water flow and the boiler exhaust gas temperature so as to obtain a consumption difference value;
and the coal-fired quantity overshoot correction value calculation unit is used for obtaining a coal-fired quantity overshoot correction value according to the consumption difference value and the standard coal consumption corresponding to the load at the current ambient temperature so as to correct the coal-fired quantity instruction of the coal-fired unit.
7. The utility model provides a reduce coal-fired unit variable load process and give coal volume overshoot equipment which characterized in that includes:
a memory for storing a computer program;
a processor for implementing the steps of the method for reducing coal overshoot during variable load of a coal-fired unit according to any of claims 1 to 5 when executing the computer program.
8. A readable storage medium, wherein the readable storage medium has stored thereon a computer program, which when executed by a processor, implements the steps of the method for reducing coal supply overshoot during a variable load process of a coal-fired unit according to any of claims 1 to 5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110705084.9A CN113375187B (en) | 2021-06-24 | Method for reducing overshoot of coal feeding amount in variable load process of coal-fired unit and related components |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110705084.9A CN113375187B (en) | 2021-06-24 | Method for reducing overshoot of coal feeding amount in variable load process of coal-fired unit and related components |
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| CN113375187A true CN113375187A (en) | 2021-09-10 |
| CN113375187B CN113375187B (en) | 2024-06-25 |
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