CN112762431A - Full-working-condition denitration system reconstructed by matching electric heating device with coal economizer - Google Patents

Full-working-condition denitration system reconstructed by matching electric heating device with coal economizer Download PDF

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Publication number
CN112762431A
CN112762431A CN202011070252.3A CN202011070252A CN112762431A CN 112762431 A CN112762431 A CN 112762431A CN 202011070252 A CN202011070252 A CN 202011070252A CN 112762431 A CN112762431 A CN 112762431A
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module
economizer
denitration
electric heating
temperature
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姜川
曾晓东
马丽平
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Xinjiang Zhonghai Taisheng Energy Co ltd
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Xinjiang Zhonghai Taisheng Energy Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/08—Arrangements of devices for treating smoke or fumes of heaters

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

The invention relates to the technical field of environmental protection, in particular to a full-working-condition denitration system formed by transforming an electric heating device with a coal economizer. The temperature monitoring system comprises a main control unit, a temperature monitoring unit and a data processing unit; the main control unit is used for controlling and managing the whole system and the operation process of single operation equipment and switching the control mode; the temperature monitoring unit is used for monitoring the temperature of each temperature measuring point in the system in real time and feeding back the temperature to the main control layer in time; the data processing unit is used for carrying out numerical calculation on the running state of the system. The design of the invention can realize the reduction of the environmental-friendly emission reaching the standard when the output of the thermal power generating unit is output, and can also participate in the deep peak regulation of the power grid to promote the consumption of clean energy, thereby realizing the reasonable utilization of the energy.

Description

Full-working-condition denitration system reconstructed by matching electric heating device with coal economizer
Technical Field
The invention relates to the technical field of environmental protection, in particular to a full-working-condition denitration system formed by transforming an electric heating device with a coal economizer.
Background
In order to improve the new energy consumption capability of a power grid, particularly to relieve the peak regulation difficulty, a series of national policies encourage power plants to improve the peak regulation capability through transformation. At present, the problem that nitrogen oxide emission exceeds standard due to low denitration efficiency caused by low flue gas temperature in a low-load state of a thermal power generating unit is the bottleneck of unit output reduction.
Disclosure of Invention
The invention aims to provide a full-working-condition denitration system formed by transforming an electric heating device with a coal economizer so as to solve the problems in the background technology.
In order to solve the technical problems, the invention provides an all-condition denitration system which is formed by transforming an electric heating device with an economizer, and the all-condition denitration system comprises a main control unit, a temperature monitoring unit and a data processing unit; the main control unit is used for controlling and managing the whole system, the operation process of single operation equipment and the switching of control modes; the temperature monitoring unit is used for monitoring the temperature of each temperature measuring point in the system in real time and feeding back the temperature to the main control layer in time; the data processing unit is used for carrying out numerical calculation on the running state of the system.
As a further improvement of the technical scheme, the main control unit comprises a centralized program control module, a layered autonomous module and a control mode module; the centralized program control module is used for performing centralized control on the whole system according to a set program; the hierarchical autonomous module is used for respectively carrying out optimization management on the single running device; the control mode module is used for selecting the control mode and controlling the smooth switching process among different control modes.
As a further improvement of the technical scheme, the hierarchical autonomous module comprises an electric heating management module, an economizer management module and a denitration management module; the electric heating management module is used for respectively controlling the starting and stopping processes of each electric heater and the reasonable distribution of heat; the economizer management module is used for controlling the start-stop process of the economizer and a water circulation system of the economizer; the denitration management module is used for controlling the starting and stopping process of the denitration equipment and guiding the parameter adjustment of the denitration operation.
As a further improvement of the technical scheme, the control mode module comprises an on-site control module, a remote monitoring module, a manual control module and a mode switching module; the local control module is used for controlling, managing and adjusting the system locally; the remote monitoring module is used for providing a way for a user to remotely monitor and regulate the system through network communication; the manual control module is used for a user to perform the operation of the manual control system and the parameter adjustment process; the mode switching module is used for coordinating and reducing the fluctuation degree of the system running state in the switching process of different control modes.
As a further improvement of the technical scheme, the temperature monitoring unit comprises a smoke temperature monitoring module, a water temperature monitoring module and a wall temperature monitoring module; the smoke temperature monitoring module is used for monitoring smoke temperatures at different point positions in real time; the water temperature monitoring module is used for monitoring the temperature of a flowing medium in the economizer in real time; the wall temperature monitoring module is used for monitoring the wall temperature of a pipeline through which the flue gas and the flowing medium flow in the system in real time.
The smoke temperature mainly comprises the smoke temperature before an economizer, the smoke temperature after the economizer, the smoke temperature before denitration equipment and the like.
As a further improvement of the technical scheme, the data processing unit comprises a data collection and uploading module, a denitration effect measuring and calculating module, an electric heating power consumption measuring and calculating module and an economizer effect measuring and calculating module; the data collection and uploading module is used for collecting state quantity and measurement quantity in the system operation process and uploading the state quantity and the measurement quantity to the main control layer for analysis and calculation; the denitration effect measuring and calculating module is used for judging whether the denitrated flue gas reaches the emission standard or not and calculating the denitration efficiency; the electric heating power consumption measuring and calculating module is used for calculating electric power of the electric heater and electric quantity consumed by the electric heater; the economizer effect measuring and calculating module is used for calculating the heat transfer capacity of the economizer.
As a further improvement of the technical solution, the calculation formula of the denitration effect measurement and calculation module is as follows:
Figure BDA0002711540540000021
wherein, C1Is NO in flue gas before denitrationXConcentration of (C)2Is subjected to denitrationNO in the exhaust gasXConcentration of (2) NO removed after operation of the denitration systemXAnd (4) concentration.
As a further improvement of the technical solution, a calculation formula of the electric heating power consumption measuring and calculating module is as follows:
Figure BDA0002711540540000031
wherein P is the total power of the electric heater, P1Power required for heating the medium, P2Power required for heating the vessel, P3For heat loss from the surface of the vessel, m1Is the weight of the medium, c1Is the specific heat of the medium, m2Is the weight of the container, c2The specific heat of the container, delta t temperature rise, h heating time, lambda heat conductivity coefficient of the thermal insulation material, s heat dissipation area of the container and delta thickness of the thermal insulation material.
As a further improvement of the technical solution, a calculation formula of the economizer effect measurement module is as follows:
Figure BDA0002711540540000032
wherein K is the heat transfer coefficient, Deltat is the average temperature and pressure, HdIs the total heating area of the economizer, BjIs the fuel consumption.
Compared with the prior art, the invention has the beneficial effects that: in this electric heater unit cooperation economizer transformation's full operating mode deNOx systems, absorb the flue gas heat through the economizer and make the flue gas temperature reduce, utilize electric energy heating flue gas through electric heater unit simultaneously, make the flue gas temperature reach the requirement of environmental protection facilities such as denitration, environmental protection discharge to reach standard when can realize reducing thermal power generating unit and exert oneself can also participate in the electric wire netting degree of depth peak shaving and promote clean energy to consume, realizes the rational utilization of the energy.
Drawings
FIG. 1 is a schematic view of the entire structure of embodiment 1;
FIG. 2 is an overall block diagram of embodiment 1;
FIG. 3 is a block diagram of a main control unit module of embodiment 1;
FIG. 4 is a block diagram of a hierarchical autonomous module according to embodiment 1;
FIG. 5 is a block diagram of a control mode module of embodiment 1;
FIG. 6 is a block diagram of a temperature monitoring unit according to embodiment 1;
FIG. 7 is a block diagram of a data processing unit according to embodiment 1;
fig. 8 is a schematic structural diagram of a control device according to embodiment 1.
The various reference numbers in the figures mean:
100. a main control unit; 101. a centralized program control module; 102. a hierarchical autonomous module; 1021. an electric heating management module; 1022. an economizer management module; 1023. a denitration management module; 103. a control mode module; 1031. a local control module; 1032. a remote monitoring module; 1033. a manual control module; 1034. a mode switching module;
200. a temperature monitoring unit; 201. a smoke temperature monitoring module; 202. a water temperature monitoring module; 203. a wall temperature monitoring module;
300. a data processing unit; 301. a data collection and uploading module; 302. a denitration effect measuring and calculating module; 303. an electric heating power consumption measuring and calculating module; 304. and the economizer effect measuring and calculating module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1 to 8, the present embodiment provides an all-condition denitration system for an electric heating device in cooperation with a coal economizer, which includes a main control unit 100, a temperature monitoring unit 200, and a data processing unit 300; the main control unit 100 is used for controlling and managing the whole system, the operation process of a single operation device and the switching of control modes; the temperature monitoring unit 200 is used for monitoring the temperature of each temperature measuring point in the system in real time and feeding back the temperature to the main control layer in time; the data processing unit 300 is used for performing numerical calculation on the operation condition of the system.
In this embodiment, the main control unit 100 includes a centralized program control module 101, a hierarchical autonomous module 102, and a control mode module 103; the centralized program control module 101 is used for performing centralized control on the whole system according to a set program; the hierarchical autonomous module 102 is used for respectively carrying out optimization management on single running equipment; the control mode module 103 is used for selecting a control mode and controlling a smooth switching process between different control modes.
Further, the hierarchical autonomous module 102 includes an electrical heating management module 1021, an economizer management module 1022, and a denitration management module 1023; the electric heating management module 1021 is used for respectively controlling the starting and stopping processes of each electric heater and the reasonable distribution of heat; the economizer management module 1022 is used for controlling the start and stop processes of the economizer and the water circulation system thereof; the denitration management module 1023 is used for controlling the start-stop process of the denitration equipment and guiding the parameter adjustment of the denitration operation.
Further, the control mode module 103 includes an on-site control module 1031, a remote monitoring module 1032, a manual control module 1033, and a mode switching module 1034; the in-place control module 1031 is used for performing operations of controlling, managing and adjusting the system in place; the remote monitoring module 1032 is used for providing a way for a user to remotely monitor and regulate the system through network communication; the manual control module 1033 is used for a user to perform the operation of the manual control system and the parameter adjustment process; the mode switching module 1034 is configured to coordinate and reduce the fluctuation degree of the system operating status during the switching of different control modes.
In this embodiment, the temperature monitoring unit 200 includes a smoke temperature monitoring module 201, a water temperature monitoring module 202, and a wall temperature monitoring module 203; the smoke temperature monitoring module 201 is used for monitoring smoke temperatures at different point positions in real time; the water temperature monitoring module 202 is used for monitoring the temperature of the flowing medium in the economizer in real time; the wall temperature monitoring module 203 is used for monitoring the wall temperature of the pipeline through which the flue gas and the flowing medium flow in the system in real time.
The smoke temperature mainly comprises the smoke temperature before an economizer, the smoke temperature after the economizer, the smoke temperature before denitration equipment and the like. Specifically, when the heat of the flue gas in front of the economizer cannot reach the absorbable amount of the economizer, an electric heater arranged in front of the economizer is started to heat the flue gas; when the smoke temperature behind the economizer is too high, the electric heater arranged in front of the economizer is stopped; when the temperature of the smoke behind the economizer does not reach the temperature required by the denitration equipment, starting an electric heater arranged behind the economizer to heat the smoke; when the temperature of the flue gas before the denitration device is too high, the heater installed behind the economizer is stopped.
When the temperature of the flowing medium in the economizer reaches an over-temperature state or a medium vaporization critical point, a water circulation system of the economizer is started to avoid medium vaporization.
When the wall temperature of the pipeline through which the flue gas flows reaches an overtemperature state, part or all of the electric heaters can be stopped according to the temperature of the flue gas; in addition, if the denitration effect is affected by stopping heating, a cooling device can be arranged outside the smoke pipe to physically cool the smoke pipe.
In addition, the operation processes are intelligently judged and controlled through the centralized program control module 101.
In this embodiment, the data processing unit 300 includes a data collection and uploading module 301, a denitration effect measuring and calculating module 302, an electric heating power consumption measuring and calculating module 303, and an economizer effect measuring and calculating module 304; the data collection and uploading module 301 is used for collecting state quantity measurement quantities in the system operation process and uploading the state quantity measurement quantities to the main control layer for analysis and calculation; the denitration effect measuring and calculating module 302 is used for judging whether the denitrated flue gas reaches the emission standard and calculating the denitration efficiency; the electric heating power consumption measuring and calculating module 303 is used for calculating electric power of the electric heater and electric quantity consumed by the electric heater; the economizer effect measurement module 304 is used for calculating the heat transfer capacity of the economizer.
The calculation formula of the denitration effect measuring and calculating module 302 is as follows:
Figure BDA0002711540540000061
wherein, C1Is NO in flue gas before denitrationXConcentration of (C)2Is NO in the denitrated flue gasXConcentration of (C)1-C2NO removed after commissioning for denitration systemsXAnd (4) concentration.
Specifically, the denitration efficiency can be used for judging the denitration effect and can be used as a basis for guiding parameter adjustment in the denitration process.
The calculation formula of the electric heating power consumption calculation module 303 is as follows:
Figure BDA0002711540540000071
wherein P is the total power of the electric heater, P1Power required for heating the medium, P2Power required for heating the vessel, P3For heat loss from the surface of the vessel, m1Is the weight of the medium, c1Is the specific heat of the medium, m2Is the weight of the container, c2The specific heat of the container, delta t temperature rise, h heating time, lambda heat conductivity coefficient of the thermal insulation material, s heat dissipation area of the container and delta thickness of the thermal insulation material.
Specifically, the total power of the electric heater can be converted into power consumption for calculating the adjustable depth of the system participating in the grid depth peak shaving.
The calculation formula of the economizer effect measuring and calculating module 304 is as follows:
Figure BDA0002711540540000072
wherein K is the heat transfer coefficient, Deltat is the average temperature and pressure, HdIs the total heating area of the economizer, BjIs the fuel consumption.
In addition, the invention also provides an all-condition denitration control device transformed by matching the electric heating device with the economizer, and referring to fig. 8, a schematic structural diagram of the all-condition denitration control device transformed by matching the electric heating device with the economizer according to the embodiment is shown, and the device comprises a processor, a memory and a bus.
The processor comprises one or more than one processing core, the processor is connected with the processor through a bus, the memory is used for storing program instructions, and the electric heating device is matched with the coal economizer to transform the full-working-condition denitration system when the processor executes the program instructions in the memory.
Alternatively, the memory may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.
In addition, the invention also provides a computer readable storage medium, wherein a computer program is stored in the computer readable storage medium, and when the computer program is executed by a processor, the full-working-condition denitration system formed by transforming the electric heating device with the coal economizer is realized.
Optionally, the present invention further provides a computer program product containing instructions, which when run on a computer, causes the computer to execute the above aspects of the all-condition denitration system in which the electric heating device is modified by matching with the economizer.
It will be understood by those skilled in the art that all or part of the steps of implementing the above embodiments may be implemented by hardware, or may be implemented by hardware related to instructions of a program, and the program may be stored in a computer readable storage medium, where the above mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (9)

1. The utility model provides an electric heater unit cooperation economizer reforms transform full operating mode deNOx systems which characterized in that: comprises a main control unit (100), a temperature monitoring unit (200) and a data processing unit (300); the main control unit (100) is used for controlling and managing the whole system and the operation process and the switching of control modes of single operation equipment; the temperature monitoring unit (200) is used for monitoring the temperature of each temperature measuring point in the system in real time and feeding back the temperature to the main control layer in time; the data processing unit (300) is used for carrying out numerical calculation on the operation condition of the system.
2. The full-working-condition denitration system reformed by the electric heating device matched with the economizer according to claim 1, is characterized in that: the main control unit (100) comprises a centralized program control module (101), a layered autonomous module (102) and a control mode module (103); the centralized program control module (101) is used for performing centralized control on the whole system according to a set program; the hierarchical autonomous module (102) is used for respectively carrying out optimization management on single running equipment; the control mode module (103) is used for selecting a control mode and controlling a smooth switching process between different control modes.
3. The full-working-condition denitration system reformed by the electric heating device matched with the economizer according to claim 2 is characterized in that: the hierarchical autonomous module (102) comprises an electric heating management module (1021), an economizer management module (1022) and a denitration management module (1023); the electric heating management module (1021) is used for respectively controlling the starting and stopping processes of each electric heater and the reasonable distribution of heat; the economizer management module (1022) is used for controlling the start-stop process of the economizer and a water circulation system thereof; and the denitration management module (1023) is used for controlling the start-stop process of the denitration equipment and guiding the parameter adjustment of the denitration operation.
4. The full-working-condition denitration system reformed by the electric heating device matched with the economizer according to claim 2 is characterized in that: the control mode module (103) comprises an on-site control module (1031), a remote monitoring module (1032), a manual control module (1033) and a mode switching module (1034); the on-site control module (1031) is used for on-site control, management and adjustment of the system; the remote monitoring module (1032) is used for providing a way for a user to remotely monitor and regulate the system through network communication; the manual control module (1033) is used for a user to perform the operation and parameter adjustment process of the manual control system; the mode switching module (1034) is used for coordinating and reducing the fluctuation degree of the system operation state in the switching process of different control modes.
5. The full-working-condition denitration system reformed by the electric heating device matched with the economizer according to claim 1, is characterized in that: the temperature monitoring unit (200) comprises a smoke temperature monitoring module (201), a water temperature monitoring module (202) and a wall temperature monitoring module (203); the smoke temperature monitoring module (201) is used for monitoring smoke temperatures at different point positions in real time; the water temperature monitoring module (202) is used for monitoring the temperature of a flowing medium in the economizer in real time; the wall temperature monitoring module (203) is used for monitoring the wall temperature of a pipeline through which the flue gas and the flowing medium flow in the system in real time.
6. The full-working-condition denitration system reformed by the electric heating device matched with the economizer according to claim 1, is characterized in that: the data processing unit (300) comprises a data collection and uploading module (301), a denitration effect measuring and calculating module (302), an electric heating power consumption measuring and calculating module (303) and an economizer effect measuring and calculating module (304); the data collection and uploading module (301) is used for collecting state quantity measurement quantity in the system operation process and uploading the state quantity measurement quantity to the main control layer for analysis and calculation; the denitration effect measuring and calculating module (302) is used for judging whether the denitrated flue gas reaches the emission standard or not and calculating the denitration efficiency; the electric heating power consumption measuring and calculating module (303) is used for calculating electric power of the electric heater and electric quantity consumed by the electric heater; the economizer effect measuring and calculating module (304) is used for calculating the heat transfer quantity of the economizer.
7. The full-working-condition denitration system reformed by the electric heating device matched with the economizer according to claim 6, is characterized in that: the calculation formula of the denitration effect measuring and calculating module (302) is as follows:
Figure FDA0002711540530000021
wherein, C1Is NO in flue gas before denitrationXConcentration of (C)2Is NO in the denitrated flue gasX(ii) concentration of (C)1-C2) NO removed after commissioning for denitration systemsXAnd (4) concentration.
8. The full-working-condition denitration system reformed by the electric heating device matched with the economizer according to claim 6, is characterized in that: the calculation formula of the electric heating power consumption measuring and calculating module (303) is as follows:
Figure FDA0002711540530000031
wherein P is the total power of the electric heater, P1Power required for heating the medium, P2Power required for heating the vessel, P3For heat loss from the surface of the vessel, m1Is the weight of the medium, c1Is the specific heat of the medium, m2Is the weight of the container, c2The specific heat of the container, delta t temperature rise, h heating time, lambda heat conductivity coefficient of the thermal insulation material, s heat dissipation area of the container and delta thickness of the thermal insulation material.
9. The full-working-condition denitration system reformed by the electric heating device matched with the economizer according to claim 6, is characterized in that: the calculation formula of the economizer effect measuring and calculating module (304) is as follows:
Figure FDA0002711540530000032
wherein K is the heat transfer coefficient, Deltat is the average temperature and pressure, HdFor coal economizerTotal heating area, BjIs the fuel consumption.
CN202011070252.3A 2020-09-30 2020-09-30 Full-working-condition denitration system reconstructed by matching electric heating device with coal economizer Pending CN112762431A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115121101A (en) * 2022-04-25 2022-09-30 江苏国信靖江发电有限公司 Method for adjusting temperature of smoke inlet end of SCR (selective catalytic reduction) system in thermal power generating unit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115121101A (en) * 2022-04-25 2022-09-30 江苏国信靖江发电有限公司 Method for adjusting temperature of smoke inlet end of SCR (selective catalytic reduction) system in thermal power generating unit
CN115121101B (en) * 2022-04-25 2023-10-10 江苏国信靖江发电有限公司 Method for adjusting temperature of smoke inlet end of SCR (selective catalytic reduction) system in thermal power unit

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