CN113007692B - A full-process automatic start-up control method for coal-fired units based on a steam-driven feed pump - Google Patents

Abstract

The invention discloses a full-process automatic starting control method of a coal-fired unit based on a steam feed pump, which comprises automatic starting control in a unit starting stage and automatic starting control in a unit grid-connected load increasing stage; in the automatic starting process of the unit, the starting of the auxiliary system of the unit and the starting of the main system of the unit are in mutual correlation seamless connection in a mode of longitudinal extension and transverse expansion, so that the automatic starting without a breakpoint in the whole process of the starting stage of the unit is realized, the technical problem that the automatic starting in the whole process of the coal-fired generator set is difficult to realize is fundamentally solved, and the method can realize the automatic starting in the whole process of the coal-fired generator set.

Description

A full-process automatic start-up control method for coal-fired units based on a steam-driven feed pump

technical field

The invention belongs to the field of thermal power generation, and relates to a whole-process automatic start-up control method for a coal-fired unit based on a steam-driven feed pump.

Background technique

According to the national policies and guidelines, my country's electric power industry will transform from a scale-expansion development to a quality-benefit development. With the continuous development of the power market and the acceleration of the two industrializations, smart power plants are safer, more user-friendly, and more efficient, and will become the development direction of my country's future power plants. As the most complex social infrastructure project, traditional power plants play an irreplaceable role in promoting economic growth. Therefore, the intelligent transformation of traditional power plants will be the only way.

The whole-process automatic start-up control technology of coal-fired units is one of the technologies of intelligent power generation. The research on this technology is of great significance from the perspective of rapid and safe start-up of units, as well as from the perspective of energy saving and efficiency enhancement. Provide reference for the application of automatic start technology in the whole process.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and to provide a whole-process automatic start-up control method for a coal-fired generating set based on a steam-driven feed pump, which can realize the automatic start-up of the coal-fired generating set throughout the process.

In order to achieve the above object, the whole process automatic start-up control method of the coal-fired unit based on the steam-driven feed pump of the present invention includes the automatic start-up control of the unit start-up stage and the automatic start-up control of the unit grid-connected and load-raising stage;

The specific process of automatic start-up control in the unit start-up phase is as follows:

Start the circulating water system, closed cooling water system, condensate water system and lubricating oil system in sequence. After the lubricating oil system is started, start the sealing oil system and put it into cranking. After the condensing water system is started, start the deaerator and flush it with water. system, start the low water side system and the auxiliary steam system at the same time, continue to start the shaft seal system after the auxiliary steam system is started, start the vacuum system after the shaft seal system is started, and start the high-pressure cylinder warmer and cylinder after the vacuum system is started. The medium-pressure cylinder is being warmed up. At the same time, the sequence control of the cylinder interlayer is started, and the EH oil system of the turbine is started. After the start of the EH oil system of the turbine is completed, the steam-driven feed pump is started. After the static water injection of the water supply pipeline is completed, start the deaerator heating system;

After the deaerator heating system is started, start the boiler water supply function group, and put into the boiler drain and exhaust interlock and steam turbine drain and exhaust interlock at the same time. The fan, wind and smoke system and wind and smoke system are automatically put into operation. After the wind and smoke system is automatically put into operation, the plasma preparation system is started, and then the feed water is automatically and the bypass is automatic. Soot blowing, start the preparation of the pulverizing system at the same time and throw the secondary air door automatically. After the preparation of the pulverizing system is completed, the first fan is automatically activated and the first layer of the plasma ignition system is activated. After the first layer of the plasma ignition system is started, the first A coal mill, then start the automatic heating and boosting system of the boiler and put into the condenser temperature reduction control to clean the boiler in a hot state, and start the stator cooling water system at the same time. The oil and oil temperature is automatically put into operation. During the running process of the steam turbine, the Roots water ring vacuum pump system is started, and the low pressure is put in during the steam turbine medium-speed warm-up process, and the 3# high pressure is put into the steam turbine medium-pressure cylinder startup mode. When the steam turbine warms up at high speed Start the boiler to automatically boost the pressure during the process of the boiler. After the boiler boost is completed, the second layer of plasma ignition system and the second coal mill will be started in sequence. After the second coal mill is started, the second set of pulverizing system will be completed. After the blower and the induced draft fan are merged, the superheater and reheater desuperheating water is automatically put in, and the steam turbine is waiting for the speed to reach the preset speed;

The specific process of automatic start-up control in the stage of grid-connection and load-raising is as follows:

First start the generator and connect to the grid. After the generator is connected to the grid, the initial load is warmed up to start the DEH cutting cylinder. After the DEH cutting cylinder is completed, it will be put into the high-feed system, and the main control of the steam generator will be automatically switched to the deaerator. The steam source is switched to four extractions After the main control of the steam turbine is automatically put into operation, the main control of the fuel is put into operation. After the automatic operation of the main control of the fuel is completed, the load is increased to the first preset load. At the same time, the auxiliary steam source is switched to the cooling and reheating pipe, and the load of the standby group rises to the first preset load. After the second preset load, start the water supply pipeline to switch to the main road for operation. After the water supply pipeline is switched to the main road, the load is increased to the third preset load, and the third mill is started to run in a dry state. At the same time, the coal mill is put into the denitration system. After the third coal mill is started, it will start to increase the load to the fourth preset load. After the load has risen to the fourth preset load, the coordinated control system will be put into the system and the plasma combustion support system will be withdrawn. After the coordinated control system is put into operation, the fourth coal mill is started. After the fourth coal mill is started, the AGC is put into operation, and the fifth coal mill is started according to the load condition of the AGC command.

The preset speed is 3005rpm.

The first preset load is 70MW.

The second preset load is 70MW.

The third preset load is 110MW.

The fourth preset load is 145MW.

The present invention has the following beneficial effects:

During the specific operation of the whole-process automatic start-up control method of the coal-fired unit based on the steam-driven feed pump of the present invention, during the automatic start-up process of the unit, the auxiliary system of the unit and the main system of the unit are started by longitudinal extension and horizontal expansion. The interrelated seamless connection realizes the automatic start of the whole process of the unit start-up phase without breakpoints, and fundamentally solves the technical problem that the whole process of automatic start of coal-fired generating units is difficult to achieve. The whole process of automatic start of the unit is more economical than other automatic starts. It avoids the need for human intervention during the automatic start-up process of the unit, and reduces the water consumption and coal consumption indicators during the start-up process of the unit. Simple, safe, fast and energy efficient.

Description of drawings

FIG. 1 is a schematic structural diagram of the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the present invention is described in further detail:

Referring to Fig. 1, the whole process automatic start-up control method of a coal-fired unit based on a steam-driven feed pump according to the present invention includes the following steps:

During the start-up phase of the unit

Start the circulating water system, closed cooling water system, condensate water system and lubricating oil system in sequence. After the lubricating oil system is started, start the sealing oil system and put it into cranking. After the condensing water system is started, start the deaerator and flush it with water. system, start the low water side system and the auxiliary steam system at the same time, continue to start the shaft seal system after the auxiliary steam system is started, start the vacuum system after the shaft seal system is started, and start the high-pressure cylinder warmer and cylinder after the vacuum system is started. The medium-pressure cylinder is being warmed up. At the same time, the sequence control of the cylinder interlayer is started, and the EH oil system of the turbine is started. After the start of the EH oil system of the turbine is completed, the steam-driven feed pump is started. After the static water injection of the water supply pipeline is completed, start the deaerator heating system;

After the deaerator heating system is put into operation, start the boiler water supply function group, and put the boiler drain and exhaust interlock and steam turbine drain and exhaust interlock at the same time. After the boiler is supplied with water, start the boiler cold cleaning system, fire detection cooling The fan, wind and smoke system and wind and smoke system are automatically put into operation. After the wind and smoke system is automatically put into operation, the plasma preparation system is started, and then the feed water is automatically and the bypass is automatic. Soot blowing, start the preparation of the pulverizing system at the same time and throw the secondary air door automatically. After the preparation of the pulverizing system is completed, the first fan is automatically activated and the first layer of the plasma ignition system is activated. After the first layer of the plasma ignition system is started, the first A coal mill, then start the automatic heating and boosting system of the boiler and put into the condenser temperature reduction control to clean the boiler in a hot state, and start the stator cooling water system at the same time. The oil and oil temperature is automatically put into operation. During the running process of the steam turbine, the Roots water ring vacuum pump system is started, and the low pressure is put in during the steam turbine medium-speed warm-up process, and the 3# high pressure is put into the steam turbine medium-pressure cylinder startup mode. When the steam turbine warms up at high speed Start the boiler to automatically boost the pressure during the process of the boiler. After the boiler boost is completed, the second layer of plasma ignition system and the second coal mill will be started in sequence. After the second coal mill is started, the second set of pulverizing system will be completed. Then start the second blower system and the second induced draft fan system. After the blower and the induced draft fan are combined, put in the superheater and reheater desuperheating water automatically, and wait for the steam turbine to stabilize at 3005rpm.

When the unit is connected to the grid and the load is increased, the generator is first started to connect to the grid. After the generator is connected to the grid, the initial load is warmed up to start the DEH cutting cylinder. The steam source of the oxygen generator is switched to four extractions. After the main control of the steam turbine is automatically put into operation, the main control of the fuel is put into operation. After the main control of the fuel is automatically put into operation, the load is increased to 70MW. After the load rises to 70MW, the water supply pipeline will be switched to the main road for operation. After the water supply pipeline has been switched to the main road, the load will be increased to 110MW, and then the third coal mill will be started. Put into the denitration system, after the start of the third coal mill is completed, then start to increase the load to 145MW, after the load rises to 145MW, the coordinated control system is put into operation and the plasma combustion support system is turned off, and the fourth coal mill is started after the coordinated control system is put into operation , after the fourth coal mill is started, put into AGC, and start the fifth coal mill according to the load condition of the AGC command.

Claims (6)

1. a coal-fired unit full-process automatic start-up control method based on a steam-driven feed pump, is characterized in that, comprises the automatic start-up control of the unit start-up stage and the automatic start-up control of the unit grid-connected load-lifting stage; The specific process of automatic start-up control in the unit start-up phase is as follows: Start the circulating water system, closed cooling water system, condensate water system and lubricating oil system in sequence. After the lubricating oil system is started, start the sealing oil system and put it into cranking. After the condensing water system is started, start the deaerator and flush it with water. system, start the low water side system and the auxiliary steam system at the same time, continue to start the shaft seal system after the auxiliary steam system is started, start the vacuum system after the shaft seal system is started, and start the high-pressure cylinder warmer and cylinder after the vacuum system is started. The medium-pressure cylinder is being warmed up. At the same time, the sequence control of the cylinder interlayer is started, and the EH oil system of the turbine is started. After the start of the EH oil system of the turbine is completed, the steam-driven feed pump is started. After the static water injection of the water supply pipeline is completed, start the deaerator heating system; After the deaerator heating system is started, start the boiler water supply function group, and put into the boiler drain and exhaust interlock and steam turbine drain and exhaust interlock at the same time. The fan, wind and smoke system and wind and smoke system are automatically put into operation. After the wind and smoke system is automatically put into operation, the plasma preparation system is started, and then the feed water is automatically and the bypass is automatic. Soot blowing, start the preparation of the pulverizing system at the same time and throw the secondary air door automatically. After the preparation of the pulverizing system is completed, the first fan is automatically activated and the first layer of the plasma ignition system is activated. After the first layer of the plasma ignition system is started, the first A coal mill, then start the boiler's automatic heating and boosting system and put into the condenser temperature reduction control to clean the boiler in a hot state, and start the stator cooling water system at the same time. The oil and oil temperature is automatically put into operation. During the running process of the steam turbine, the Roots water ring vacuum pump system is started, and the low pressure is put in during the steam turbine medium-speed warm-up process, and the 3# high pressure is put into the steam turbine medium-pressure cylinder startup mode. When the steam turbine warms up at high speed Start the boiler to automatically boost the pressure during the process, and start the second-layer plasma ignition system and the second coal mill in sequence after the boiler boost is completed. After the second coal mill is started, the second set of pulverizing system is completed. After the blower and the induced draft fan are merged, the superheater and the reheater desuperheating water are automatically put in, and the steam turbine is waiting for the fixed speed to reach the preset speed; The specific process of automatic start-up control in the stage of grid-connection and load-raising is as follows: First start the generator and connect to the grid. After the generator is connected to the grid, the initial load is warmed up to start the DEH cutting cylinder. After the DEH cutting cylinder is completed, it will be put into the high-feed system, and the main control of the steam generator will be automatically switched to the deaerator. The steam source is switched to four extractions After the main control of the steam turbine is automatically put into operation, the main control of the fuel is put into operation. After the automatic operation of the main control of the fuel is completed, the load is increased to the first preset load. At the same time, the auxiliary steam source is switched to the cooling and reheating pipe, and the load of the standby group rises to the first preset load. After the second preset load, start the water supply pipeline to switch to the main road for operation. After the water supply pipeline is switched to the main road, the load is increased to the third preset load, and the third mill is started to run in a dry state. At the same time, the coal mill is put into the denitration system. After the third coal mill is started, it will start to increase the load to the fourth preset load. After the load has risen to the fourth preset load, the coordinated control system will be put into the system and the plasma combustion support system will be withdrawn. After the coordinated control system is put into operation, the fourth coal mill is started. After the fourth coal mill is started, the AGC is put into operation, and the fifth coal mill is started according to the load condition of the AGC command. 2 . The whole-process automatic start-up control method for a coal-fired unit based on a steam-driven feed pump according to claim 1 , wherein the preset speed is 3005 rpm. 3 . 3 . The full-process automatic start-up control method for a coal-fired unit based on a steam-driven feed pump according to claim 1 , wherein the first preset load is 70MW. 4 . 4 . The full-process automatic start-up control method for a coal-fired unit based on a steam-driven feed pump according to claim 1 , wherein the second preset load is 70MW. 5 . 5 . The full-process automatic start-up control method for a coal-fired unit based on a steam-driven feed pump according to claim 1 , wherein the third preset load is 110 MW. 6 . 6 . The full-process automatic start-up control method for a coal-fired unit based on a steam-driven feed pump according to claim 1 , wherein the fourth preset load is 145MW. 7 .

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