CN112879890B - Automatic starting control method for whole process of coal-fired unit based on electric water feeding pump - Google Patents
Automatic starting control method for whole process of coal-fired unit based on electric water feeding pump Download PDFInfo
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- CN112879890B CN112879890B CN202110197104.6A CN202110197104A CN112879890B CN 112879890 B CN112879890 B CN 112879890B CN 202110197104 A CN202110197104 A CN 202110197104A CN 112879890 B CN112879890 B CN 112879890B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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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
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
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- 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
Abstract
The invention discloses a coal-fired unit whole-process automatic starting control method based on an electric water feeding pump, which comprises automatic starting control in a unit starting stage and automatic starting control in a unit grid-connected load increasing stage.
Description
Technical Field
The invention belongs to the field of thermal power generation, and relates to a coal-fired unit whole-process automatic starting control method based on an electric water feed pump.
Background
According to the policy guidelines of China, the power industry in China is shifted from scale expansion type development to quality benefit type development. With the continuous development of the electric power market and the acceleration of the two types of power, the intelligent power plant has the characteristics of being safer, more humanized, more efficient and the like, and becomes the development direction of future power plants in China. Traditional power plants have a position which is difficult to replace as the most complex social infrastructure project for promoting economic growth. Therefore, the intelligent transformation of the traditional power plant is a necessary way.
The full-process automatic starting control technology of the coal-fired unit is one of the technologies of intelligent power generation, has extremely important significance for the research of the technology from the perspective of quick and safe starting of the unit and the perspective of energy conservation and efficiency improvement, and provides reference for the application of the full-process automatic starting technology of an intelligent power plant.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a coal-fired power generation unit whole-process automatic starting control method based on an electric water-feeding pump, which can realize the whole-process automatic starting of the coal-fired power generation unit.
In order to achieve the aim, the full-process automatic starting control method of the coal-fired unit based on the electric water feeding pump comprises the automatic starting control of a unit starting stage and the automatic starting control of a unit grid-connected load increasing stage;
the specific process of the automatic starting control in the set starting stage is as follows:
11) starting a circulating water system, a closed cooling water system, a condensate system and a lubricating oil system in sequence, starting a sealing oil system and putting into a barring gear after the lubricating oil system is started, starting a water feeding and flushing system of a deaerator after the condensate system is started, starting a low water adding side system and an auxiliary steam system at the same time, starting a shaft seal system after the auxiliary steam system is started, and starting a vacuum system after the shaft seal system is started;
12) starting a high-pressure cylinder warm cylinder and a medium-pressure cylinder to be warm, simultaneously starting a cylinder interlayer sequential control, and then starting an EH oil system of a steam engine; starting a water supply pipeline for static water injection after the deaerator is washed with water, starting a deaerator heating system after the water supply pipeline for static water injection is finished, and starting an electric water supply pump;
13) starting a boiler water feeding functional group, simultaneously putting a boiler water discharging and exhaust interlock and a steam turbine water discharging and exhaust interlock, starting a boiler cold cleaning system, a fire detection cooling fan and a wind and smoke system in sequence after the boiler finishes water feeding, automatically putting the wind and smoke system, starting a plasma preparation system after the wind and smoke system is automatically put, then automatically feeding water and bypassing, starting a hearth purging after the water feeding is automatically put, starting an air preheater to continuously blow ash after the hearth purging is finished, simultaneously starting a powder preparation system to prepare and put a secondary air door to automatically, putting a primary fan to automatically start a first layer of plasma ignition system after the powder preparation system is finished, starting a first coal mill after the first layer of plasma ignition system is started, starting the boiler automatic temperature rising and pressure rising system and putting a steam condenser to reduce the temperature and control for carrying out boiler hot cleaning after the first layer of plasma ignition system is started, starting a stator cooling water system, starting a turbine to flush after the boiler is cleaned in a thermal state, and automatically starting the temperature of lubricating oil of the turbine, wherein a Roots water ring vacuum pump system is started in the turbine flushing process, a low-pressure heater and a turbine medium-speed cylinder starting mode are started in the turbine medium-speed warming process to start a 3# high-pressure heater, the boiler is started to automatically boost pressure in the turbine high-speed warming process, a second layer of plasma ignition system and a second coal mill are sequentially started after the boiler is boosted, starting a second set of powder making system after the second coal mill is started, then a second air feeder system and a second draught fan system are started, and a temperature reducing water automatic superheater of an air feeder and a reheater is started after the air feeder and the draught fan are merged, so as to wait for the set speed of the turbine at a constant speed;
the specific process of the automatic starting control of the unit grid-connected load-increasing stage is as follows:
starting a generator to be connected to a power grid, performing initial load warming after the generator is connected to the power grid, starting a DEH cylinder, putting into a high pressure system after the DEH cylinder is cut, simultaneously switching a steam turbine main control automatic and a deaerator steam source to four pumps, putting a fuel main control automatic after the steam turbine main control automatic putting is finished, increasing the load to a first preset load after the fuel main control automatic putting is finished, simultaneously switching an auxiliary steam source to a cold reheating pipe, starting a water supply pipeline to be switched to a main path for operation after a standby group load is increased to a second preset load, simultaneously starting a steam-driven water supply pump for returning an electric pump, increasing the load to a third preset load for dry state operation after the water supply pipeline is switched to the main path for operation, starting a third coal mill after the dry state for operation, simultaneously putting into a denitration system, increasing the load to a fourth preset load after the third coal mill is started, and putting into a plasma combustion-supporting system after the load is increased to the fourth preset load, and starting a fourth coal mill after the coordinated control system is put into operation, putting the AGC after the fourth coal mill is started, and starting a fifth coal mill according to the load condition of the AGC instruction.
The set speed was 3005 rpm.
The first preset load is 70 MW.
The second preset load is 70 MW.
The third preset load is 110 MW.
The fourth preset load is 145 MW.
The invention has the following beneficial effects:
the invention relates to a coal-fired unit whole-process automatic start control method based on an electric feed pump, which is characterized in that when the method is specifically operated, in the automatic start process of the unit, the start of an auxiliary system of the unit and the start of a main system of the unit are in mutual correlation and seamless connection in a longitudinal extension and transverse expansion mode, so that the whole-process breakpoint-free automatic start of the unit in the start stage is realized, the technical problem that the whole-process automatic start of the coal-fired generator unit is difficult to realize is fundamentally solved, the whole-process automatic start of the unit is more economical than other automatic starts, the manual intervention of the unit in the automatic start process is avoided, the water consumption and coal consumption indexes of the unit in the start process are reduced, the misoperation of the unit caused by human reasons in the start process is fundamentally avoided, and the unit is simpler, safer, quicker and more energy-saving in the start process.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the method for controlling the automatic start of the coal-fired unit based on the electric feed pump in the whole process comprises the automatic start control in the unit start stage and the automatic start control in the unit grid-connected load-increasing stage;
the specific process of the automatic starting control in the set starting stage is as follows:
11) starting a circulating water system, a closed cooling water system, a condensate system and a lubricating oil system in sequence, starting a sealing oil system and putting into a barring gear after the lubricating oil system is started, starting a water feeding and flushing system of a deaerator after the condensate system is started, starting a low water adding side system and an auxiliary steam system at the same time, starting a shaft seal system after the auxiliary steam system is started, and starting a vacuum system after the shaft seal system is started;
12) starting a high-pressure cylinder warming cylinder and a medium-pressure cylinder to warm positively, starting a cylinder interlayer sequential control at the same time, and then starting an EH oil system of a steam engine; starting a water supply pipeline for static water injection after the deaerator is flushed with water, starting a deaerator heating system after the water supply pipeline for static water injection is finished, and starting an electric water supply pump;
13) starting a boiler water feeding functional group, simultaneously putting a boiler water discharging and exhaust interlock and a steam turbine water discharging and exhaust interlock, starting a boiler cold cleaning system, a fire detection cooling fan and a wind and smoke system in sequence after the boiler finishes water feeding, automatically putting the wind and smoke system, starting a plasma preparation system after the wind and smoke system is automatically put, then automatically feeding water and bypassing, starting a hearth purging after the water feeding is automatically put, starting an air preheater to continuously blow ash after the hearth purging is finished, simultaneously starting a powder preparation system to prepare and put a secondary air door to automatically, putting a primary fan to automatically start a first layer of plasma ignition system after the powder preparation system is finished, starting a first coal mill after the first layer of plasma ignition system is started, starting the boiler automatic temperature rising and pressure rising system and putting a steam condenser to reduce the temperature and control for carrying out boiler hot cleaning after the first layer of plasma ignition system is started, starting a stator cooling water system, starting a turbine to flush after the boiler is cleaned in a thermal state, and automatically starting the temperature of lubricating oil of the turbine, wherein a Roots water ring vacuum pump system is started in the turbine flushing process, a low-pressure heater and a turbine medium-speed cylinder starting mode are started in the turbine medium-speed warming process to start a 3# high-pressure heater, the boiler is started to automatically boost pressure in the turbine high-speed warming process, a second layer of plasma ignition system and a second coal mill are sequentially started after the boiler is boosted, starting a second set of powder making system after the second coal mill is started, then a second air feeder system and a second draught fan system are started, and a blower and a draught fan are added to reduce the temperature of a reheater to automatically superheater after the blower and the draught fan are merged, and waiting for the turbine to keep the constant speed of 3005 rpm;
the specific process of automatic starting control in the grid-connected load-increasing stage of the unit comprises the following steps:
starting a generator to be connected to the network, performing initial load warming after the generator is connected to the network, starting a DEH cylinder cutting, putting into a high pressure system after the DEH cylinder cutting is finished, simultaneously switching a steam turbine main control automatic and a deaerator steam source to four pumps, switching a fuel main control automatic after the steam turbine main control automatic is finished, increasing the load to 70MW after the fuel main control automatic is finished, simultaneously switching an auxiliary steam source to a cold re-heating pipe, starting a water supply pipeline to be switched to a main path for running after a standby group load is increased to 70MW, simultaneously starting a steam-driven water supply pump for returning an electric pump, increasing the load to 110MW for dry state running after the water supply pipeline is switched to the main path for running, starting a third coal mill after dry state running, putting into a denitration system, increasing the load to 145MW after the third coal mill is started, and adjusting a control system for returning the plasma combustion-supporting system after the load is increased to a fourth preset load, and starting a fourth coal mill after the coordination control system is put into operation, putting the AGC after the fourth coal mill is started, and starting a fifth coal mill according to the load condition of the AGC command.
Claims (6)
1. A coal-fired unit whole-process automatic start control method based on an electric feed pump is characterized by comprising automatic start control in a unit start stage and automatic start control in a unit grid-connected load-increasing stage;
the specific process of the automatic starting control in the set starting stage is as follows:
11) starting a circulating water system, a closed cooling water system, a condensate system and a lubricating oil system in sequence, starting a sealing oil system and putting into a barring gear after the lubricating oil system is started, starting a water feeding and flushing system of a deaerator after the condensate system is started, starting a low water adding side system and an auxiliary steam system at the same time, starting a shaft seal system after the auxiliary steam system is started, and starting a vacuum system after the shaft seal system is started;
12) starting a high-pressure cylinder warm cylinder and a medium-pressure cylinder to be warm, simultaneously starting a cylinder interlayer sequential control, and then starting an EH oil system of a steam engine; starting a water supply pipeline for static water injection after the deaerator is washed with water, starting a deaerator heating system after the water supply pipeline for static water injection is finished, and starting an electric water supply pump;
13) starting a boiler water feeding functional group, simultaneously putting into a boiler water discharging and gas discharging interlock and a steam turbine water discharging and gas discharging interlock, starting a boiler cold cleaning system, a fire detection cooling fan and a wind and smoke system in sequence after the boiler finishes water feeding, then putting the wind and smoke system into automation, starting a plasma preparation system after the wind and smoke system is put into automation, then putting water into automation and bypassing automation, starting a hearth purging after the water feeding automation is put into, starting an air preheater to continuously blow soot after the hearth purging is finished, simultaneously starting a powder production system to prepare and putting a secondary air door to automate, putting a primary fan to automate and starting a first layer of plasma ignition system after the powder production system finishes preparation, starting a first coal mill after the first layer of plasma ignition system is started, starting the boiler automatic temperature rising and boosting system and putting into a condenser to reduce the temperature and control to carry out boiler hot cleaning after the first coal mill is started, starting a stator cooling water system, starting a turbine to flush after the boiler is cleaned in a thermal state, and automatically starting the temperature of lubricating oil of the turbine, wherein a Roots water ring vacuum pump system is started in the turbine flushing process, a low-pressure heater and a turbine medium-speed cylinder starting mode are started in the turbine medium-speed warming process to start a 3# high-pressure heater, the boiler is started to automatically boost pressure in the turbine high-speed warming process, a second layer of plasma ignition system and a second coal mill are sequentially started after the boiler is boosted, starting a second set of powder making system after the second coal mill is started, then a second air feeder system and a second draught fan system are started, and a temperature reducing water automatic superheater of an air feeder and a reheater is started after the air feeder and the draught fan are merged, so as to wait for the set speed of the turbine at a constant speed;
the specific process of automatic starting control in the grid-connected load-increasing stage of the unit comprises the following steps:
starting a generator to be connected to a power grid, performing initial load warming after the generator is connected to the power grid, starting a DEH cylinder, putting into a high pressure system after the DEH cylinder is cut, simultaneously switching a steam turbine main control automatic and a deaerator steam source to four pumps, putting a fuel main control automatic after the steam turbine main control automatic putting is finished, increasing the load to a first preset load after the fuel main control automatic putting is finished, simultaneously switching an auxiliary steam source to a cold reheating pipe, starting a water supply pipeline to be switched to a main path for operation after a standby group load is increased to a second preset load, simultaneously starting a steam-driven water supply pump for returning an electric pump, increasing the load to a third preset load for dry state operation after the water supply pipeline is switched to the main path for operation, starting a third coal mill after the dry state for operation, simultaneously putting into a denitration system, increasing the load to a fourth preset load after the third coal mill is started, and putting into a plasma combustion-supporting system after the load is increased to the fourth preset load, and starting a fourth coal mill after the coordinated control system is put into operation, putting the AGC after the fourth coal mill is started, and starting a fifth coal mill according to the load condition of the AGC instruction.
2. The method for controlling the whole-process automatic start of a coal-fired unit based on an electric water-feeding pump according to claim 1, wherein the set speed is 3005 rpm.
3. The full-process automatic start control method for the coal-fired unit based on the electric water-feeding pump as claimed in claim 1, characterized in that the first preset load is 70 MW.
4. The method for controlling the whole-process automatic start of the coal-fired unit based on the electric water-feeding pump according to claim 1, wherein the second preset load is 70 MW.
5. The method for controlling the whole-process automatic start of a coal-fired unit based on an electric water-feeding pump according to claim 1, wherein the third preset load is 110 MW.
6. The method according to claim 1, wherein the fourth predetermined load is 145 MW.
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