CN115016576B - Reheat steam temperature control method and device, readable medium and electronic equipment - Google Patents
Reheat steam temperature control method and device, readable medium and electronic equipment Download PDFInfo
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- CN115016576B CN115016576B CN202210594749.8A CN202210594749A CN115016576B CN 115016576 B CN115016576 B CN 115016576B CN 202210594749 A CN202210594749 A CN 202210594749A CN 115016576 B CN115016576 B CN 115016576B
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000003245 coal Substances 0.000 claims abstract description 177
- 230000009467 reduction Effects 0.000 claims abstract description 43
- 230000001276 controlling effect Effects 0.000 claims abstract description 33
- 230000033228 biological regulation Effects 0.000 claims abstract description 25
- 230000001105 regulatory effect Effects 0.000 claims abstract description 13
- 239000000446 fuel Substances 0.000 claims description 187
- 238000012545 processing Methods 0.000 claims description 20
- 238000004590 computer program Methods 0.000 claims description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 8
- 239000003546 flue gas Substances 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- 238000010248 power generation Methods 0.000 abstract description 2
- 238000004891 communication Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000005236 sound signal Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000002277 temperature effect Effects 0.000 description 2
- KLDZYURQCUYZBL-UHFFFAOYSA-N 2-[3-[(2-hydroxyphenyl)methylideneamino]propyliminomethyl]phenol Chemical compound OC1=CC=CC=C1C=NCCCN=CC1=CC=CC=C1O KLDZYURQCUYZBL-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 201000001098 delayed sleep phase syndrome Diseases 0.000 description 1
- 208000033921 delayed sleep phase type circadian rhythm sleep disease Diseases 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
-
- 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
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/12—Controlling superheat temperature by attemperating the superheated steam, e.g. by injected water sprays
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The disclosure relates to the technical field of thermal power generation, in particular to a reheat steam temperature control method, a reheat steam temperature control device, a readable medium and electronic equipment. The reheat steam temperature control method is applied to a thermal power generating unit based on wind-coal cooperation, and comprises the following steps: under the condition of deep peak regulation and load reduction, an original air quantity instruction is regulated in real time to obtain a new air quantity instruction, wherein the air quantity reduction rate of the new air quantity instruction is smaller than that of the original air quantity instruction; and controlling the air quantity entering the coal mill according to the fresh air quantity command. According to the technical scheme, when the deep peak regulation and load reduction are carried out, the original air quantity command is adjusted in real time, the air quantity reduction rate is dynamically slowed down, so that the reheat steam temperature is improved relative to the original air quantity command, and the problem that the reheat steam temperature is continuously reduced after the temperature of the water and the flue gas are reduced to the regulation limit is solved.
Description
Technical Field
The disclosure relates to the technical field of thermal power generation, in particular to a reheat steam temperature control method, a reheat steam temperature control device, a readable medium and electronic equipment.
Background
The reheat steam temperature of the thermal power generating unit is one of important operation parameters of the unit, the safety and economy of the unit are affected, and the general reheat steam temperature can be controlled by adjusting the entering quantity of the desuperheating water and the opening of the flue gas baffle. Under the condition of deep peak regulation and load reduction, the reheat steam temperature can be obviously reduced along with the rapid reduction of the heat of the unit, and the temperature reduction water and the flue gas baffle can reach the regulation limit. After the temperature of the reheated steam is reduced and the flue gas baffle reaches the adjustment limit, the problem that the temperature of the reheated steam is continuously reduced cannot be relieved.
Disclosure of Invention
The purpose of the present disclosure is to provide a reheat steam temperature control method, a reheat steam temperature control device, a readable medium and an electronic device, which can continuously alleviate the problem that reheat steam temperature is continuously reduced under the conditions of deep peak regulation and load reduction.
In order to achieve the above object, the present disclosure provides a reheat steam temperature control method applied to a thermal power generating unit based on wind-coal cooperation, the method including:
under the condition of deep peak regulation and load reduction, an original air quantity instruction is regulated in real time to obtain a new air quantity instruction, wherein the air quantity reduction rate of the new air quantity instruction is smaller than that of the original air quantity instruction;
and controlling the air quantity entering the coal mill according to the fresh air quantity instruction.
Optionally, the step of adjusting the original air volume command in real time to obtain the new air volume command includes:
performing inertia processing on the original air volume command in real time to obtain a first air volume command;
and selecting the air volume command with large air volume in the original air volume command and the first air volume command as a new air volume command.
Optionally, the method further comprises:
under the condition of deep peak regulation and load reduction, the fuel quantity ratio of coal mills in each layer is controlled so as to lead the flame center to move upwards.
Optionally, controlling the fuel quantity ratio entering each layer of coal pulverizer to move up the flame center includes:
the amount of fuel entering the lowermost coal mill is controlled to be less than the amount of fuel entering the uppermost coal mill.
Optionally, the step of controlling the amount of fuel entering the lowermost coal pulverizer to be less than the amount of fuel entering the uppermost coal pulverizer comprises:
performing inertia processing on the set power value to obtain a first power value;
subtracting the set power value from the first power value to obtain a power variation value;
obtaining the product of the power variation value and the coefficient of the lowest coal mill, and carrying out addition processing on the product and the fuel quantity of the original fuel instruction of the lowest coal mill to obtain a new fuel instruction of the lowest coal mill;
controlling the amount of fuel entering the lowermost coal mill by adopting a new fuel command of the lowermost coal mill;
obtaining a new fuel instruction of the uppermost coal mill according to the total fuel quantity corresponding to the set power value of the unit, the fuel quantity of the new fuel instruction of the lowermost coal mill and the total number of the coal mills, wherein the new fuel instruction of the uppermost coal mill is identical to the new fuel instruction of the coal mills of other layers except the lowermost layer;
and controlling the fuel quantity entering the uppermost coal mill by adopting a new fuel command of the uppermost coal mill.
The disclosure also provides a reheat steam temperature control device, is applied to thermal power generating unit based on wind coal is synergistic, the device includes:
the system comprises a fresh air quantity instruction generation module, a control module and a control module, wherein the fresh air quantity instruction generation module is used for adjusting an original air quantity instruction in real time under the condition of deep peak regulation and load reduction to obtain a fresh air quantity instruction, and the air quantity reduction rate of the fresh air quantity instruction is smaller than that of the original air quantity instruction;
and the air quantity control module is used for controlling the air quantity entering the coal mill according to the fresh air quantity instruction.
Optionally, the fresh air quantity instruction generating module includes:
the first inertia submodule is used for carrying out inertia processing on the original air quantity instruction in real time to obtain a first air quantity instruction;
gao Xuanzi module for selecting the air volume command with large air volume from the original air volume command and the first air volume command as the fresh air volume command.
Optionally, the apparatus further comprises:
and the fuel quantity control module is used for controlling the fuel quantity ratio of the coal mill entering each layer under the condition of deep peak regulation and load reduction so as to enable the flame center to move upwards.
The present disclosure also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the above method.
The present disclosure also provides an electronic device, including:
a memory having a computer program stored thereon;
and a processor for executing the computer program in the memory to implement the steps of the above method.
Through the technical scheme, when the deep peak regulation and load reduction are carried out, the original air quantity instruction is regulated in real time, the air quantity reduction rate is dynamically slowed down, so that the reheat steam temperature is improved relative to the original air quantity instruction, and the problem that the reheat steam temperature is continuously reduced after the temperature of the water and the flue gas are reduced to the regulation limit is solved.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
FIG. 1 is a flow chart of a reheat steam temperature control method provided in accordance with an embodiment of the present disclosure.
Fig. 2 is a block diagram of a reheat steam temperature control device provided by an embodiment of the present disclosure.
Fig. 3 is a schematic diagram of a fresh air volume command generation module according to an embodiment of the present disclosure.
FIG. 4 is a schematic illustration of a fuel quantity control module provided by one embodiment of the present disclosure generating new fuel instructions for a lowermost coal pulverizer.
Fig. 5 is a block diagram of an electronic device provided by an embodiment of the present disclosure.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
It should be noted that, all actions for acquiring signals, information or data in the present disclosure are performed under the condition of conforming to the corresponding data protection rule policy of the country of the location and obtaining the authorization given by the owner of the corresponding device.
Based on the problems of the background art, in order to alleviate the problem of continued drop in reheat steam temperature, it is necessary to start from other aspects than desuperheating water and flue gas baffles. Applicants' studies found that:
the conventional air quantity adjustment takes the air quantity corresponding to the fuel quantity as an adjustment target, and does not consider reheat steam temperature change. When the load is reduced by deep peak shaving, the fuel quantity is required to be reduced at a certain speed to ensure the balance of energy in response to the load of the unit. The reduction of the fuel quantity can cause the reduction of the heat quantity in the furnace, so that the reheat steam temperature is reduced; in order to maintain certain combustion economy, the air quantity needs to be reduced along with the reduction of the fuel quantity, the reduction of the air quantity can weaken the convection heat exchange of the boiler, and the reheat steam temperature can be reduced. Because of the energy balance requirement, the fuel quantity must be reduced, so that the reheat steam temperature is only reduced by reducing the air quantity reduction rate, and the reduction of convection heat exchange is reduced. Therefore, the design control strategy is as follows: when the peak is deeply regulated and the load is reduced, the air quantity reduction rate is dynamically slowed down, and the reheat steam temperature is improved.
The fuel system of the existing boiler consists of 5 layers of coal mills and 6 layers of coal mills, and the total fuel quantity is the sum of the fuel quantity of each layer of coal mill. The existing total fuel command synchronously increases and decreases the fuel quantity of each layer of mill (average fuel quantity of each layer of coal mill), thereby achieving the purpose of controlling the total fuel quantity. While the total fuel amount is unchanged, the fuel distribution of each coal mill can change the combustion conditions in the boiler. When the output of the upper coal mill is high, the flame center moves upwards, the convection heat exchange is enhanced, and the reheat steam temperature can be relatively increased. Therefore, the design control strategy is as follows: when the peak is deeply regulated and the load is reduced, the fuel quantity of the lower coal mill is dynamically reduced, and the upper coal mill can automatically increase the output to maintain the total fuel quantity due to the regulating action of the total fuel quantity, so that the center of flame moves upwards, and the reheat steam temperature is improved.
Based on the conception, the disclosure provides a reheat steam temperature control method which is applied to a thermal power generating unit based on wind-coal cooperation. FIG. 1 is a flow chart of a reheat steam temperature control method provided in accordance with an embodiment of the present disclosure. As shown in fig. 1, the method includes:
and S11, under the condition of deep peak regulation and load reduction, the original air quantity instruction is adjusted in real time, and a new air quantity instruction is obtained.
The air volume reduction rate of the fresh air volume command is smaller than that of the original air volume command.
And step S12, controlling the air quantity entering the coal mill according to the fresh air quantity instruction.
Through the technical scheme, when the deep peak regulation and load reduction are carried out, the original air quantity instruction is regulated in real time, the air quantity reduction rate is dynamically slowed down, so that the reheat steam temperature is improved relative to the original air quantity instruction, and the problem that the reheat steam temperature is continuously reduced after the temperature of the water and the flue gas are reduced to the regulation limit is solved.
Optionally, the method further comprises: and when the load is increased, controlling the air quantity entering the coal mill according to the original air quantity command.
Through the technical scheme, when the load is increased, the original air quantity command is still adopted to control the air quantity entering the coal mill, and the air quantity is not influenced.
Optionally, in step S11, the real-time adjustment of the original air volume command, to obtain the new air volume command includes:
and carrying out inertial processing on the original air volume command in real time to obtain a first air volume command.
And selecting the air volume command with large air volume in the original air volume command and the first air volume command as a new air volume command.
Wherein the inertial processing may be processed by an inertial module of the controller. The inertia time of the inertia process may be 200 seconds.
Through the technical scheme, when the unit is in load reduction, the air volume of the first air volume command subjected to inertia processing on the original air volume command can be reduced slowly relative to the original air volume command, namely, the air volume of the first air volume command can be larger than the air volume of the original air volume command, and then the new air volume command is the first air volume command. Therefore, the air quantity entering the coal mill is controlled according to the first air quantity instruction, the air quantity descending rate is slowed down, and the reheating steam temperature effect is improved relative to the original air quantity instruction.
Optionally, the method further comprises:
under the condition of deep peak regulation and load reduction, the fuel quantity ratio of coal mills in each layer is controlled so as to lead the flame center to move upwards.
From the foregoing analysis, it can be seen that the flame center moves upward when the upper coal pulverizer output is high. Therefore, in order to achieve the flame center up-shift, the fuel amount of the lower coal mill is dynamically reduced, and the upper coal mill automatically increases the output to maintain the total fuel amount due to the adjustment of the total fuel amount, so that the flame center up-shifts. Thus, the amount of fuel entering the lowermost coal mill can be made smaller than the amount of fuel entering the uppermost coal mill; the fuel quantity of all layers of coal mills below the uppermost layer can be smaller than the fuel quantity entering the uppermost layer of coal mills; the fuel quantity of the coal mill from top to bottom can be reduced; or the fuel amounts of the two lowest coal mills are the same, the fuel amounts of all the two lower coal mills are the same, the fuel amount of the two lowest coal mills is smaller than the fuel amount of all the two lower coal mills, etc.
According to the technical scheme, under the condition that the total fuel quantity is unchanged, the fuel quantity ratio of each layer of coal mill is changed, so that the flame center moves upwards, and the reheat steam temperature is improved compared with the mode of average fuel quantity ratio of each layer of coal mill.
Optionally, in an embodiment, the controlling the fuel amount ratio into each layer of coal pulverizer includes:
under the condition of deep peak shaving and load reduction, the fuel quantity entering the lowest coal mill is controlled to be smaller than the fuel quantity entering the uppermost coal mill.
Through the technical scheme, the fuel quantity of each layer of coal mill is uneven, the fuel quantity of the lowest layer of coal mill is smaller than that of the uppermost layer of coal mill, the flame center is moved upwards, and the reheat steam temperature is improved.
Optionally, the step of controlling the amount of fuel entering the lowermost coal pulverizer to be less than the amount of fuel entering the uppermost coal pulverizer comprises:
and performing inertia processing on the set power value to obtain a first power value.
And subtracting the set power value from the first power value to obtain a power variation value.
The power change value may be a positive value or a negative value. When the load is reduced by deep peak shaving, the first power value is larger than the set power value, and the power change value is a negative value. And otherwise, when the load is increased, the first power value is smaller than the set power value, and the power change value is a positive value.
And obtaining the product of the power variation value and the coefficient of the lowest coal mill, and carrying out addition processing on the product and the fuel quantity of the original fuel instruction of the lowest coal mill to obtain a new fuel instruction of the lowest coal mill.
The coefficient of the lowest coal mill can be a positive value smaller than 1, and when the load is reduced by deep peak shaving, the fuel quantity of the new fuel instruction of the lowest coal mill is smaller than the fuel quantity of the original fuel instruction of the lowest coal mill. On the contrary, when the load is increased, the coefficient of the lowest coal mill in the process of deep peak regulation and load reduction can be still used, and the fuel quantity of the new fuel instruction of the lowest coal mill is larger than the fuel quantity of the original fuel instruction of the lowest coal mill; the fuel quantity of the new fuel command of the lowest coal mill can be equal to the fuel quantity of the original fuel command of the lowest coal mill if the coefficient of the lowest coal mill is 0.
And controlling the amount of fuel entering the lowest coal mill by adopting a new fuel command of the lowest coal mill.
And obtaining a new fuel instruction of the uppermost coal mill according to the total fuel quantity corresponding to the set power value of the unit, the fuel quantity of the new fuel instruction of the lowermost coal mill and the total number of the coal mills, wherein the new fuel instruction of the uppermost coal mill is identical to the new fuel instruction of the coal mills of other layers except the lowermost layer.
When the load is reduced by deep peak shaving, the obtained new fuel command of the lowest coal mill is smaller than the original fuel command of the lowest coal mill, and the total fuel is unchanged, so that the fuel quantity of the new fuel command of the highest coal mill is increased relative to the original fuel command of the highest coal mill, namely the highest coal mill automatically increases the output to maintain the total fuel quantity. On the contrary, when the load is increased, if the coefficient of the lowest coal mill in the process of deep peak shaving and load reduction is still used, the fuel quantity of the new fuel instruction of the lowest coal mill is larger than the fuel quantity of the original fuel instruction of the lowest coal mill, and the total fuel quantity is unchanged, so that the fuel quantity of the new fuel instruction of the highest coal mill is reduced relative to the fuel quantity of the original fuel instruction of the highest coal mill, namely the highest coal mill automatically reduces the output force to maintain the total fuel quantity; if the coefficient of the lowest coal mill is set to 0, the fuel quantity of the new fuel command of the lowest coal mill is equal to the fuel quantity of the original fuel command of the lowest coal mill, and the output of the highest coal mill is kept unchanged.
And controlling the fuel quantity entering the uppermost coal mill by adopting a fuel command of the uppermost coal mill.
Through the technical scheme, when the peak is deeply regulated and the load is reduced, the fuel quantity of the coal mill at the lowest layer is dynamically reduced, and due to the regulating effect of the total fuel quantity, the coal mills at other layers (including the uppermost layer) except the lowest layer can automatically increase the output force to maintain the total fuel quantity, so that the flame center moves upwards, and the reheat steam temperature is improved. Conversely, for load rising, if the lowest coal mill coefficient is still used when the load is reduced by deep peak shaving, the flame center can be moved downwards, and the reheat steam temperature is relatively reduced; or the coefficient of the lowest coal mill is 0, the flame center is not changed, and the reheat steam temperature is not influenced.
Based on the above conception, the present disclosure provides a reheat steam temperature control device applied to a thermal power generating unit based on wind-coal cooperation. Fig. 2 is a block diagram of a reheat steam temperature control device provided by an embodiment of the present disclosure. As shown in fig. 2, the apparatus includes:
and the new air volume command generating module 11 is used for adjusting the original air volume command in real time under the condition of deep peak regulation and load reduction to obtain a new air volume command, wherein the air volume reduction rate of the new air volume command is smaller than that of the original air volume command.
And the air quantity control module 12 is used for controlling the air quantity entering the coal mill according to the fresh air quantity instruction.
Through the technical scheme, when the deep peak regulation and load reduction are carried out, the original air quantity instruction is regulated in real time, the air quantity reduction rate is dynamically slowed down, so that the reheat steam temperature is improved relative to the original air quantity instruction, and the problem that the reheat steam temperature is continuously reduced after the temperature of the water and the flue gas are reduced to the regulation limit is solved.
Optionally, the fresh air quantity instruction generating module 11 includes:
the first inertia submodule is used for carrying out inertia processing on the original air quantity instruction in real time to obtain a first air quantity instruction;
gao Xuanzi module for selecting the air volume command with large air volume from the original air volume command and the first air volume command as the fresh air volume command.
As shown in fig. 3, the original air quantity instruction is led out, one path of the original air quantity instruction is connected with the input of a first inertia sub-module, and the output of the first inertia sub-module is connected with the first input of a high selection sub-module; the other path is connected to the second input of the Gao Xuanzi module, and the output (fresh air quantity instruction) of the Gao Xuanzi module is connected to the original system instead of the original air quantity instruction.
Through the technical scheme, when the unit is in load reduction, the air volume of the first air volume command subjected to inertia processing on the original air volume command can be reduced slowly relative to the original air volume command, namely, the air volume of the first air volume command can be larger than the air volume of the original air volume command, and then the new air volume command is the first air volume command. Therefore, the air quantity entering the coal mill is controlled according to the first air quantity instruction, the air quantity descending rate is slowed down, and the reheating steam temperature effect is improved relative to the original air quantity instruction. When the load is increased, the original air quantity command is still adopted to control the air quantity entering the coal mill, and the air quantity is not influenced.
Optionally, the apparatus further comprises:
and the fuel quantity control module is used for controlling the fuel quantity ratio of the coal mill entering each layer under the condition of deep peak regulation and load reduction so as to enable the flame center to move upwards.
According to the technical scheme, under the condition that the total fuel quantity is unchanged, the fuel quantity ratio of each layer of coal mill is changed, so that the flame center moves upwards, and the reheat steam temperature is improved compared with the mode of average fuel quantity ratio of each layer of coal mill.
Optionally, the fuel amount control module is specifically configured to control the amount of fuel entering the lowest tier coal pulverizer to be less than the amount of fuel entering the uppermost tier coal pulverizer in the event of deep peak shaving and load shedding.
Through the technical scheme, the fuel quantity of each layer of coal mill is uneven, the fuel quantity of the lowest layer of coal mill is smaller than that of the uppermost layer of coal mill, the flame center is moved upwards, and the reheat steam temperature is improved.
Optionally, when the fuel amount control module is specifically configured to control the amount of fuel entering the lowest coal mill to be smaller than the amount of fuel entering the uppermost coal mill under the condition of deep peak shaving and load reduction, the fuel amount control module includes:
and the second inertia submodule is used for carrying out inertia processing on the set power value of the unit to obtain a first power value.
And the subtraction submodule is used for subtracting the set power value from the first power value to obtain a power change value.
And the adding sub-module is used for obtaining the product of the power variation value and the coefficient of the lowest coal mill, and adding the product and the fuel quantity of the original fuel instruction of the lowest coal mill to obtain the new fuel instruction of the lowest coal mill.
And the lowest-layer fuel quantity control sub-module is used for controlling the quantity of fuel entering the lowest-layer coal mill by adopting a new fuel command of the lowest-layer coal mill.
As shown in fig. 4, one path of the set power (instruction) is accessed to the first input of the subtraction sub-module, and the other path is accessed to the second inertia sub-module (the inertia time can be set to be 200 seconds); the output of the second inertia sub-module is connected with the second input of the subtraction sub-module; the output of the subtracting submodule is connected with the first input of the adding submodule, the raw fuel instruction of the lowest coal mill is connected with the second input of the adding submodule, and the output of the adding submodule (the new fuel instruction of the lowest coal mill) replaces the raw fuel instruction of the lowest coal mill to control the lowest coal mill.
And the uppermost fuel instruction obtaining submodule is used for obtaining the new fuel instruction of the uppermost coal mill according to the total fuel quantity corresponding to the set power value of the unit, the fuel quantity of the new fuel instruction of the lowermost coal mill and the total number of the coal mills, wherein the new fuel instruction of the uppermost coal mill is identical to the new fuel instruction of the coal mills of other layers except the lowermost coal mill.
And the uppermost fuel quantity control sub-module is used for controlling the quantity of fuel entering the uppermost coal mill by adopting a new fuel command of the uppermost coal mill.
Through the technical scheme, when the peak is deeply regulated and the load is reduced, the fuel quantity of the coal mill at the lowest layer is dynamically reduced, and due to the regulating effect of the total fuel quantity, the coal mills at other layers (including the uppermost layer) except the lowest layer can automatically increase the output force to maintain the total fuel quantity, so that the flame center moves upwards, and the reheat steam temperature is improved. Conversely, for load rising, if the lowest coal mill coefficient is still used when the load is reduced by deep peak shaving, the flame center can be moved downwards, and the reheat steam temperature is relatively reduced; or the coefficient of the lowest coal mill is 0, the flame center is not changed, and the reheat steam temperature is not influenced.
The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein.
Fig. 5 is a block diagram of an electronic device 700, according to an example embodiment. As shown in fig. 5, the electronic device 700 may include: a processor 701, a memory 702. The electronic device 700 may also include one or more of a multimedia component 703, an input/output (I/O) interface 704, and a communication component 705.
Wherein the processor 701 is configured to control the overall operation of the electronic device 700 to perform all or part of the steps of the reheat steam temperature control method described above. The memory 702 is used to store various types of data to support operation on the electronic device 700, which may include, for example, instructions for any application or method operating on the electronic device 700, as well as application-related data, such as contact data, messages sent and received, pictures, audio, video, and so forth. The Memory 702 may be implemented by any type or combination of volatile or non-volatile Memory devices, such as static random access Memory (Static Random Access Memory, SRAM for short), electrically erasable programmable Read-Only Memory (Electrically Erasable Programmable Read-Only Memory, EEPROM for short), erasable programmable Read-Only Memory (Erasable Programmable Read-Only Memory, EPROM for short), programmable Read-Only Memory (Programmable Read-Only Memory, PROM for short), read-Only Memory (ROM for short), magnetic Memory, flash Memory, magnetic disk, or optical disk. The multimedia component 703 can include a screen and an audio component. Wherein the screen may be, for example, a touch screen, the audio component being for outputting and/or inputting audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signals may be further stored in the memory 702 or transmitted through the communication component 705. The audio assembly further comprises at least one speaker for outputting audio signals. The I/O interface 704 provides an interface between the processor 701 and other interface modules, which may be a keyboard, mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 705 is for wired or wireless communication between the electronic device 700 and other devices. Wireless communication, such as Wi-Fi, bluetooth, near field communication (Near Field Communication, NFC for short), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or one or a combination of more of them, is not limited herein. The corresponding communication component 705 may thus comprise: wi-Fi module, bluetooth module, NFC module, etc.
In an exemplary embodiment, the electronic device 700 may be implemented by one or more application specific integrated circuits (Application Specific Integrated Circuit, abbreviated ASIC), digital signal processor (Digital Signal Processor, abbreviated DSP), digital signal processing device (Digital Signal Processing Device, abbreviated DSPD), programmable logic device (Programmable Logic Device, abbreviated PLD), field programmable gate array (Field Programmable Gate Array, abbreviated FPGA), controller, microcontroller, microprocessor, or other electronic components for performing the reheat steam temperature control method described above.
In another exemplary embodiment, a computer readable storage medium is also provided that includes program instructions that, when executed by a processor, implement the steps of the reheat steam temperature control method described above. For example, the computer readable storage medium may be the memory 702 including program instructions described above that are executable by the processor 701 of the electronic device 700 to perform the reheat steam temperature control method described above.
In another exemplary embodiment, a computer program product is also provided, comprising a computer program executable by a programmable apparatus, the computer program having code portions for performing the above-described reheat steam temperature control method when executed by the programmable apparatus.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (6)
1. A reheat steam temperature control method, characterized in that it is applied to a thermal power generating unit based on wind-coal cooperation, the method comprising:
under the condition of deep peak regulation and load reduction, an original air quantity instruction is regulated in real time to obtain a new air quantity instruction, wherein the air quantity reduction rate of the new air quantity instruction is smaller than that of the original air quantity instruction;
controlling the air quantity entering the coal mill according to the fresh air quantity instruction;
the method further comprises the steps of:
under the conditions of deep peak regulation and load reduction, controlling the fuel quantity ratio of coal mills entering each layer to enable the flame center to move upwards;
controlling the fuel quantity ratio entering each layer of coal mill to enable the flame center to move upwards comprises the following steps:
controlling the fuel quantity entering the lowest coal mill to be smaller than the fuel quantity entering the uppermost coal mill;
the step of controlling the amount of fuel entering the lowermost coal pulverizer to be less than the amount of fuel entering the uppermost coal pulverizer comprises:
performing inertia processing on the set power value to obtain a first power value;
subtracting the set power value from the first power value to obtain a power variation value;
obtaining the product of the power variation value and the coefficient of the lowest coal mill, and carrying out addition processing on the product and the fuel quantity of the original fuel instruction of the lowest coal mill to obtain a new fuel instruction of the lowest coal mill;
controlling the amount of fuel entering the lowermost coal mill by adopting a new fuel command of the lowermost coal mill;
obtaining a new fuel instruction of the uppermost coal mill according to the total fuel quantity corresponding to the set power value of the unit, the fuel quantity of the new fuel instruction of the lowermost coal mill and the total number of the coal mills, wherein the new fuel instruction of the uppermost coal mill is identical to the new fuel instruction of the coal mills of other layers except the lowermost layer;
and controlling the fuel quantity entering the uppermost coal mill by adopting a new fuel command of the uppermost coal mill.
2. The reheat steam temperature control method as set forth in claim 1, wherein the step of adjusting the original air quantity command in real time to obtain the new air quantity command includes:
performing inertia processing on the original air volume command in real time to obtain a first air volume command;
and selecting the air volume command with large air volume in the original air volume command and the first air volume command as a new air volume command.
3. A reheat steam temperature control device, characterized in that is applied to thermal power generating unit based on wind-coal cooperation, the device includes:
the system comprises a fresh air quantity instruction generation module, a control module and a control module, wherein the fresh air quantity instruction generation module is used for adjusting an original air quantity instruction in real time under the condition of deep peak regulation and load reduction to obtain a fresh air quantity instruction, and the air quantity reduction rate of the fresh air quantity instruction is smaller than that of the original air quantity instruction;
the air quantity control module is used for controlling the air quantity entering the coal mill according to the fresh air quantity instruction;
the apparatus further comprises:
the fuel quantity control module is used for controlling the fuel quantity ratio of the coal mill entering each layer under the condition of deep peak regulation and load reduction so as to enable the flame center to move upwards;
controlling the fuel quantity ratio entering each layer of coal mill to enable the flame center to move upwards comprises the following steps:
controlling the fuel quantity entering the lowest coal mill to be smaller than the fuel quantity entering the uppermost coal mill;
the step of controlling the amount of fuel entering the lowermost coal pulverizer to be less than the amount of fuel entering the uppermost coal pulverizer comprises:
performing inertia processing on the set power value to obtain a first power value;
subtracting the set power value from the first power value to obtain a power variation value;
obtaining the product of the power variation value and the coefficient of the lowest coal mill, and carrying out addition processing on the product and the fuel quantity of the original fuel instruction of the lowest coal mill to obtain a new fuel instruction of the lowest coal mill;
controlling the amount of fuel entering the lowermost coal mill by adopting a new fuel command of the lowermost coal mill;
obtaining a new fuel instruction of the uppermost coal mill according to the total fuel quantity corresponding to the set power value of the unit, the fuel quantity of the new fuel instruction of the lowermost coal mill and the total number of the coal mills, wherein the new fuel instruction of the uppermost coal mill is identical to the new fuel instruction of the coal mills of other layers except the lowermost layer;
and controlling the fuel quantity entering the uppermost coal mill by adopting a new fuel command of the uppermost coal mill.
4. The reheat steam temperature control device according to claim 3, wherein the fresh air quantity command generating module includes:
the first inertia submodule is used for carrying out inertia processing on the original air quantity instruction in real time to obtain a first air quantity instruction;
gao Xuanzi module for selecting the air volume command with large air volume from the original air volume command and the first air volume command as the fresh air volume command.
5. A non-transitory computer readable storage medium having stored thereon a computer program, characterized in that the program when executed by a processor realizes the steps of the method according to claim 1 or 2.
6. An electronic device, comprising:
a memory having a computer program stored thereon;
a processor for executing said computer program in said memory to carry out the steps of the method of claim 1 or 2.
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