CN113893683A - Full-load denitration system of subcritical coal-fired boiler - Google Patents
Full-load denitration system of subcritical coal-fired boiler Download PDFInfo
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- CN113893683A CN113893683A CN202110943433.0A CN202110943433A CN113893683A CN 113893683 A CN113893683 A CN 113893683A CN 202110943433 A CN202110943433 A CN 202110943433A CN 113893683 A CN113893683 A CN 113893683A
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B01D—SEPARATION
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- B01D53/34—Chemical or biological purification of waste gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
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- 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
- F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
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- 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
- F23J15/006—Layout of treatment plant
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- 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
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- 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
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- B01D2258/00—Sources of waste gases
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- B01D2258/0283—Flue gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/10—Nitrogen; Compounds thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2219/00—Treatment devices
- F23J2219/10—Catalytic reduction devices
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Abstract
The invention discloses a full-load denitration system of a subcritical coal-fired boiler, which comprises a flue gas pipeline, wherein a denitration structure is arranged in the flue gas pipeline; the denitration structure includes: the device comprises an economizer, an SCR denitration device, a motor, a gear, two slide rails, a rotary spraying disc, a gear ring, a containing groove, a conveying pipe, a plurality of discharging heads, a circulating assembly, a water supply assembly and a steam assembly; the denitration device has the beneficial effects that the denitration structure is adopted, flue gas generated by the boiler enters the economizer, the built-in economizer is used for heating the water supply assembly, the denitration treatment is carried out on the flue gas through the SCR denitration device arranged in the flue gas pipeline, the drive motor works, the motor drives the gear to slowly rotate, so that the rotary spraying disc is driven to rotate in the two slide rails, the medicament is conveyed into the containing groove in the rotary spraying disc through the conveying pipe, and the medicament is conveyed into the flue gas pipeline through the plurality of discharge heads arranged on the rotary spraying disc.
Description
Technical Field
The invention relates to the technical field of flue gas denitration, in particular to a full-load denitration system of a subcritical coal-fired boiler.
Background
In recent years, in order to reduce atmospheric pollution and improve atmospheric quality, the national requirements on pollution emission are getting tighter and tighter, and the standards are getting higher and higher.
In order to respond to the requirements of national policies, most domestic coal-fired power plants in active service have been modified by flue gas denitration devices, most power plants adopt a Selective Catalytic Reduction (SCR) denitration process, the SCR denitration process has strict requirements on the flue gas temperature, when the flue gas temperature is higher than 420 ℃, the denitration catalyst is sintered and loses efficacy, and when the flue gas temperature is lower than 310 ℃, the generated ammonium bisulfate can block capillary pores of the denitration catalyst to cause permanent inactivation of the denitration catalyst besides reduction of the denitration efficiency.
The improvement of denitration device import flue gas temperature mainly has transformation schemes such as flue gas bypass, economizer graded transformation, feedwater economizer bypass, hot water recirculation, 0 # high pressure feed water heater, and the above-mentioned transformation has the transformation cost height, the transformation degree of difficulty is big, the system is complicated scheduling problem, and many power plants are forbidden, consequently urgent need find a scheme that not only invests in for a short time, the system is simple, can effectively improve denitration device import flue gas temperature again.
Disclosure of Invention
The invention aims to solve the problems, designs a subcritical coal-fired boiler full-load denitration system, and solves the technical problems that a Selective Catalytic Reduction (SCR) denitration process is adopted in most of the existing power plants, the SCR denitration process has strict requirements on the flue gas temperature, the denitration catalyst is sintered and loses efficacy when the flue gas temperature is higher than 420 ℃, and the denitration catalyst is permanently inactivated due to the fact that the generated ammonium bisulfate blocks capillary pores of the denitration catalyst when the flue gas temperature is lower than 310 ℃.
The technical scheme of the invention for realizing the aim is as follows: a full-load denitration system of a subcritical coal-fired boiler comprises a flue gas pipeline, wherein a denitration structure is arranged in the flue gas pipeline;
the denitration structure includes: the device comprises an economizer, an SCR denitration device, a motor, a gear, two slide rails, a rotary spraying disc, a gear ring, a containing groove, a conveying pipe, a plurality of discharging heads, a circulating assembly, a water supply assembly and a steam assembly;
the coal economizer is arranged at the upper end in the flue gas pipeline, the SCR denitration device is arranged at the center in the flue gas pipeline, the motor is arranged at one side of the flue gas pipeline, the driving end is embedded in the flue gas pipeline through a sealing bearing, the gear is arranged at the driving end of the motor, two slide rails are arranged in the flue gas pipeline, the rotary spraying disc is movably embedded in the two slide rails, the gear ring is arranged at the upper end of the rotary spraying disc and is meshed with the gear, the holding groove is arranged in the rotary spraying disc, one end of the conveying pipe penetrates through the flue gas pipeline and is movably embedded at one side of the rotary spraying disc, a plurality of discharging heads are arranged on the rotary spraying disc, the circulating component is arranged at the lower end of the flue gas pipeline, the other end of the conveying pipe is embedded at the upper end of the flue gas pipeline, and one end of the water supply component is connected with the coal economizer, the steam assembly is connected with the water supply assembly.
Preferably, the circulation assembly includes: the device comprises a three-way control valve, a flue outlet, a detector, a circulating fan and a circulating pipe;
the device comprises a smoke pipeline, a three-way control valve, a smoke outlet flue, a detection meter, a circulating fan, a smoke outlet end, a smoke outlet pipe and a smoke outlet pipe, wherein one end of the three-way control valve is installed at the lower end of the smoke pipeline, the smoke outlet pipe is installed at the lower end of the three-way control valve, the detection meter is installed on the smoke outlet flue, the air inlet end of the circulating fan is connected with one end of the three-way control valve, one end of the circulating pipe is connected with the air outlet end of the circulating fan, and the other end of the circulating pipe is embedded in the smoke pipeline.
Preferably, the water feed assembly includes: a water supply pipeline, a deaerator and a boiler drum;
the water supply pipeline is wound in the economizer, the deaerator is connected to one end of the water supply pipeline, and the boiler drum is connected with the other end of the water supply pipeline.
Preferably, the steam assembly includes: the system comprises a first high-pressure heater, a second high-pressure heater, a third high-pressure heater, a first steam extraction pipeline, a second steam extraction pipeline, a third steam extraction pipeline, a steam turbine, a steam pipeline and a soot blowing steam main pipe;
first high pressure feed water heater, second high pressure feed water heater and third high pressure feed water heater install gradually in on the water supply pipe, first extraction steam pipeline, second extraction steam pipeline and third extraction steam pipeline connect respectively in on first high pressure feed water heater, second high pressure feed water heater and the third high pressure feed water heater, the steam turbine with the other end of first extraction steam pipe, second extraction steam pipeline and third extraction steam pipeline is connected, steam conduit one end with first extraction steam pipeline one side is connected, blow grey steam female pipe with steam conduit connection and both ends respectively with platen superheater export header and boiler blow grey headtotail.
Preferably, the steam pipeline is provided with a stop valve a, an electric valve a and a check valve a in sequence along the steam conveying direction.
Preferably, the first steam extraction pipeline, the second steam extraction pipeline and the third steam extraction pipeline are sequentially provided with an electric valve and a check valve along the steam conveying direction.
Preferably, the steam pipeline is connected with two drainage pipelines, and a manual stop valve B is arranged on the steam pipeline between the two drainage pipelines.
The subcritical coal-fired boiler full-load denitration system manufactured by the technical scheme of the invention adopts a denitration structure, flue gas generated by a boiler enters an economizer, a water supply assembly is heated by the built-in economizer, the flue gas is subjected to denitration treatment by an SCR (selective catalytic reduction) denitration device arranged in a flue gas pipeline, a driving motor works and drives a gear to slowly rotate by the motor so as to drive a rotary spraying disc to rotate in two slide rails, a medicament is conveyed into a containing groove in the rotary spraying disc by a conveying pipe, the medicament is conveyed into the flue gas pipeline by a plurality of discharge heads arranged on the rotary spraying disc, the medicament and the flue gas are more thoroughly fused, steam in the water supply assembly is pumped out by driving a steam assembly to work, the circulating assembly is driven to work, and the denitration flue gas is detected by the circulating assembly, to discharging or circulating, the effective Selective Catalytic Reduction (SCR) denitration technology that has solved present vast majority of power plants adopts has strict requirements to the flue gas temperature, can cause denitration catalyst sintering to become invalid when the flue gas temperature is higher than 420 ℃, and when the flue gas temperature is less than 310 ℃, except leading to denitration efficiency to reduce, the ammonium bisulfate that generates still can block up denitration catalyst capillary hole, causes the technical problem of denitration catalyst permanent inactivation.
The present case still has: 1. the existing system and heater are fully utilized, the system is small in change, the investment is low, the effect is obvious, and the operation of putting into and stopping is simple;
2. high-temperature steam is led out by using the soot blowing main pipe, the temperature and the pressure of the soot blowing steam are far lower than the design parameters of a No. 1 high-pressure heater, the safety margin is large, and the reliability is high;
3. need not to cut and weld on high-pressure pipeline, no high-pressure valve etc. follow the soot blowing system pipeline after the decompression and draw forth, pressure is lower relatively, and is lower relatively to the requirement of material and valve, and the transformation degree of difficulty is little, and it is easy to implement, and the transformation cycle is short.
Drawings
FIG. 1 is a schematic sectional view of a full-load denitration system of a subcritical coal-fired boiler according to the present invention.
FIG. 2 is a schematic structural diagram of a main view of a full-load denitration system of a subcritical coal-fired boiler according to the present invention.
FIG. 3 is a schematic top view of a rotary spraying plate of the full-load denitration system of the subcritical coal-fired boiler according to the present invention.
FIG. 4 is an enlarged schematic structural view of the point A of the full-load denitration system of the subcritical coal-fired boiler.
FIG. 5 is a schematic view of an enlarged structure at the B position of the full-load denitration system of the subcritical coal-fired boiler.
In the figure: 1. a flue gas duct; 2. a coal economizer; 3. an SCR denitration device; 4. a motor; 5. a gear; 6. a slide rail; 7. rotating the spray plate; 8. a ring gear; 9. a containing groove; 10. a delivery pipe; 11. Discharging a stub bar; 12. a three-way control valve; 13. discharging the flue; 14. a detector; 15. a circulating fan; 16. a circulation pipe; 17. a water supply pipe; 18. a deaerator; 19. a boiler drum; 20. a first high pressure heater; 21. a second high pressure heater; 22. a third high pressure heater; 23. a first steam extraction duct; 24. a second extraction conduit; 25. a third extraction conduit; 26. a steam turbine; 27. a steam line; 28. blowing a steam main pipe.
Detailed Description
The invention is described in detail with reference to the accompanying drawings, and as shown in fig. 1-5, a full-load denitration system of a subcritical coal-fired boiler comprises a flue gas pipeline, wherein a denitration structure is arranged in the flue gas pipeline;
the denitration structure includes: the device comprises an economizer, an SCR denitration device, a motor, a gear, two slide rails, a rotary spraying disc, a gear ring, a containing groove, a conveying pipe, a plurality of discharging heads, a circulating assembly, a water supply assembly and a steam assembly;
the economizer is installed in flue gas pipeline upper end, SCR denitrification facility installs center department in flue gas pipeline, the motor is installed in flue gas pipeline one side and the drive end inlays the dress in flue gas pipeline through sealed bearing, the gear is installed in the motor drive end, two slide rails are all installed in flue gas pipeline, it inlays the dress in two slide rails to rotate the activity of spraying the dish, the ring gear is installed in rotating the upper end of spraying the dish and with gear engagement, it is located to hold the groove and rotates the spraying dish, conveyer pipe one end runs through in flue gas pipeline and activity inlay dress in rotating spraying dish one side, if dry stub bar all install on rotating the spraying dish, the circulation subassembly is installed in flue gas pipeline lower extreme and the other end inlays the dress in flue gas pipeline upper end, water supply subassembly one end is connected with the economizer, steam subassembly is connected with the water supply subassembly.
The circulation assembly includes: the device comprises a three-way control valve, a flue outlet, a detector, a circulating fan and a circulating pipe;
one end of the three-way control valve is installed at the lower end of the flue gas pipeline, the flue outlet is installed at the lower end of the three-way control valve, the detector is installed on the flue outlet, the air inlet end of the circulating fan is connected with one end of the three-way control valve, one end of the circulating pipe is connected with the air outlet end of the circulating fan, and the other end of the circulating pipe is embedded in the flue gas pipeline.
The water supply assembly includes: a water supply pipeline, a deaerator and a boiler drum;
the water supply pipeline is wound in the economizer, the deaerator is connected to one end of the water supply pipeline, and the boiler steam drum is connected with the other end of the water supply pipeline.
The steam assembly includes: the system comprises a first high-pressure heater, a second high-pressure heater, a third high-pressure heater, a first steam extraction pipeline, a second steam extraction pipeline, a third steam extraction pipeline, a steam turbine, a steam pipeline and a soot blowing steam main pipe;
first high pressure feed water heater, second high pressure feed water heater and third high pressure feed water heater install in proper order on the water supply line, first extraction steam pipeline, second extraction steam pipeline and third extraction steam pipeline are connected respectively in first high pressure feed water heater, on second high pressure feed water heater and the third high pressure feed water heater, the steam turbine and first extraction steam pipe, the other end of second extraction steam pipeline and third extraction steam pipeline is connected, steam conduit one end is connected with first extraction steam pipeline one side, blow grey steam main pipe and steam pipe connection and both ends respectively with platen superheater export header and boiler soot blowing headtotail.
The steam pipeline is sequentially provided with a stop valve A, an electric valve A and a check valve A along the steam conveying direction.
The first steam extraction pipeline, the second steam extraction pipeline and the third steam extraction pipeline are sequentially provided with an electric valve B and a check valve B along the steam conveying direction.
Two drainage pipelines are connected on the steam pipeline, and a manual stop valve B is arranged on the steam pipeline between the two drainage pipelines
The embodiment is characterized in that a denitration structure is arranged in the flue gas pipeline;
the denitration structure includes: the device comprises an economizer, an SCR denitration device, a motor, a gear, two slide rails, a rotary spraying disc, a gear ring, a containing groove, a conveying pipe, a plurality of discharging heads, a circulating assembly, a water supply assembly and a steam assembly;
the coal economizer is arranged at the upper end in the flue gas pipeline, the SCR denitration device is arranged at the center in the flue gas pipeline, the motor is arranged at one side of the flue gas pipeline, the driving end of the motor is embedded in the flue gas pipeline through a sealing bearing, the gear is arranged at the driving end of the motor, two sliding rails are arranged in the flue gas pipeline, the rotary spraying disc is movably embedded in the two sliding rails, the gear ring is arranged at the upper end of the rotary spraying disc and is meshed with the gear, the containing groove is positioned in the rotary spraying disc, one end of the conveying pipe penetrates through the flue gas pipeline and is movably embedded at one side of the rotary spraying disc, a plurality of discharging heads are arranged on the rotary spraying disc, the circulating component is arranged at the lower end of the flue gas pipeline, the other end of the circulating component is embedded at the upper end of the flue gas pipeline, one end of the water supply component is connected with the coal economizer, and the steam component is connected with the water supply component; the denitration structure that the present case adopted, the flue gas that the boiler produced gets into the economizer, heat the water supply subassembly through built-in economizer, denitration treatment is carried out to the flue gas through the SCR denitrification facility of installing in the flue gas pipeline, work through driving motor, drive gear through the motor and slowly rotate, thereby drive and rotate the rotation and spray the dish and rotate in two slide rails, and then carry the medicament to the holding tank in the rotation and spray the dish through the conveyer pipe, carry the medicament to the flue gas pipeline through a plurality of stub bars of installing on rotating the spraying dish, make medicament and flue gas fuse more thoroughly, and then work through driving steam subassembly, take out the steam in the water supply subassembly, and then work through driving circulation subassembly, detect the flue gas that the denitration was accomplished through circulation subassembly, to discharging or circulating, the effectual Selective Catalytic Reduction (SCR) denitration technology of solving present most power plants, the SCR denitration process has strict requirements on the flue gas temperature, the denitration catalyst can be sintered and lose efficacy when the flue gas temperature is higher than 420 ℃, and the generated ammonium bisulfate can block capillary pores of the denitration catalyst to cause the permanent inactivation of the denitration catalyst besides the reduction of the denitration efficiency when the flue gas temperature is lower than 310 ℃.
All the electrical components in the present application are connected with the power supply adapted to the electrical components through the wires, and an appropriate controller should be selected according to actual conditions to meet the control requirements, and specific connection and control sequences should be obtained. (the details of the connection and operation sequence of the components and parts in this case should be referred to the following working principle, the detailed connection means thereof, the following working principle and process are generally described in the following, which are well known in the art.)
Example (b): a full-load denitration system of a subcritical coal-fired boiler comprises a flue gas pipeline 1, wherein a denitration structure is arranged in the flue gas pipeline 1;
in a specific implementation process, the denitration structure comprises: the device comprises an economizer 2, an SCR denitration device 3, a motor 4, a gear 5, two slide rails 6, a rotary spraying disc 7, a gear ring 8, a containing groove 9, a conveying pipe 10, a plurality of discharging heads 11, a circulating assembly, a water supply assembly and a steam assembly;
It should be noted that flue gas that the boiler produced gets into economizer 2, heat the water supply component through built-in economizer 2, carry out denitration treatment to the flue gas through the SCR denitrification facility 3 of installing in flue gas pipeline 1, through driving motor 4 work, drive gear 5 through motor 4 and carry out slow rotation, thereby drive and rotate and spray dish 7 at two slide rails 6 internal rotations, in rethread conveyer pipe 10 carries the medicament to holding groove 9 in rotating and spraying dish 7, carry the medicament to flue gas pipeline 1 through installing a plurality of stub bars 11 on rotating and spraying dish 7, make medicament and flue gas fuse more thoroughly, rethread drive steam subassembly work, take out the steam in the water supply component, rethread drive circulation subassembly work, detect the flue gas that the denitration was accomplished through the circulation subassembly, to discharging or circulating.
In a specific implementation, the circulation assembly comprises: a three-way control valve 12, a flue outlet 13, a detector 14, a circulating fan 15 and a circulating pipe 16;
one end of a three-way control valve 12 is installed at the lower end of the flue gas pipeline 1, a flue outlet 13 is installed at the lower end of the three-way control valve 12, a detector 14 is installed on the flue outlet 13, the air inlet end of a circulating fan 15 is connected with one end of the three-way control valve 12, one end of a circulating pipe 16 is connected with the air outlet end of the circulating fan 15, and the other end of the circulating pipe is embedded in the flue gas pipeline 1.
It should be noted that, the flue gas is detected by the detection meter 14 installed on the flue gas outlet 13, and when the denitration effect of the flue gas does not meet the requirement, the flue gas enters the circulating fan 15 by controlling the three-way control valve 12, and then the circulating fan 15 is driven to operate, so that the flue gas is conveyed to the upper end of the flue gas pipeline 1 through the circulating pipe 16 for secondary denitration.
In a specific implementation, the water supply assembly comprises: a water feed pipe 17, a deaerator 18, and a boiler drum 19; the connection relationship is as follows:
the water supply pipeline 17 is wound in the economizer 2, the deaerator 18 is connected to one end of the water supply pipeline 17, and the boiler drum 19 is connected to the other end of the water supply pipeline 17.
In a specific implementation, a steam assembly includes: a first high-pressure heater 20, a second high-pressure heater 21, a third high-pressure heater 22, a first steam extraction pipeline 23, a second steam extraction pipeline 24, a third steam extraction pipeline 25, a steam turbine 26, a steam pipeline 27 and a soot blowing steam main pipe 28; the connection relationship is as follows:
the first high-pressure heater 20, the second high-pressure heater 21 and the third high-pressure heater 22 are sequentially installed on the water supply pipeline 17, the first steam extraction pipeline 23, the second steam extraction pipeline 24 and the third steam extraction pipeline 25 are respectively connected to the first high-pressure heater 20, the second high-pressure heater 21 and the third high-pressure heater 22, the steam turbine 26 is connected with the other ends of the first steam extraction pipe, the second steam extraction pipeline 24 and the third steam extraction pipeline 25, one end of the steam pipeline 27 is connected with one side of the first steam extraction pipeline 23, the soot blowing steam main pipe 28 is connected with the steam pipeline 27, and two ends of the soot blowing steam main pipe are respectively connected with the screen superheater outlet header and the boiler soot blowing system.
It should be noted that the steam extracted by the first pressurized heater comes from the first-stage extraction steam of the turbine 26, the steam extracted by the second high-pressure heater 21 comes from the second-stage extraction steam of the turbine 26, and the steam extracted by the third high-pressure heater 22 comes from the third-stage extraction steam of the turbine 26, during the start-up of the unit, when the turbine 26 is not turning, no steam is extracted from the first, second, and third stages of the turbine 26, and the three high-pressure heaters cannot heat the feed water; or in the initial stage from the flushing of the steam turbine 26 to the grid connection, the first, second and third-section steam extraction volumes are very small, the heating effect on the feed water is weak, the temperature of the feed water entering the economizer 2 is low, the heat quantity of the feed water absorbed in the economizer 2 is large, and after the flue gas absorbs too much heat through the economizer 2, the temperature of the flue gas at the outlet of the economizer 2 is reduced greatly, so that the temperature of the flue gas entering the SCR denitration device 3 cannot meet the input condition of the denitration system (lower than 310 ℃), and the NOx emission exceeds the standard.
And when the turbine 26 unit is started, all valves on the steam pipeline 27 are closed, so that the boiler can be completely withdrawn, and no influence is caused on the parts of the original system of the boiler and the turbine.
This application is through drawing high-temperature steam on blowing grey steam main pipe 28 and sending to first high pressure feed water heater 20, heats the feedwater, improves the feedwater temperature that gets into economizer 2, reduces the feedwater and absorbs heat in economizer 2 to improve economizer 2 export (SCR denitrification facility 3 entry) flue gas temperature, through calculating, can improve the flue gas temperature that gets into SCR denitrification facility 3 and be about 20 ℃, just can drop into the deNOx systems before steam turbine 26 dashes to turn round, realize the full load denitration of start-up process.
After tests, after a certain subcritical 600MW W flame natural circulation boiler is put into operation in the unit starting process, the temperature of feed water is increased by 72 ℃ in the No. 1 heating process, the temperature of feed water at the inlet of the economizer 2 is increased to 212 ℃ from 140 ℃, the temperature of flue gas at the outlet of the economizer 2 is increased by 21 ℃, and the operation condition of the SCR denitration device 3 is achieved.
It should also be noted that the device makes full use of the existing system and heater, the system change is small, the operation of putting into operation and stopping is simple, the investment is small, and the denitration effect is obvious.
In some embodiments of the present application, the first high pressure heater 20 extracts steam from a first section of steam extraction opening of the steam turbine 26 through the first steam extraction pipeline 23, the second high pressure heater 21 extracts steam from a second section of steam extraction opening of the steam turbine 26 through the second steam extraction pipeline 24, the third high pressure heater 22 extracts steam from a third section of steam extraction opening of the steam turbine 26 through the third steam extraction pipeline 25, and the first steam extraction pipeline 23, the second steam extraction pipeline 24, and the third steam extraction pipeline 25 are provided with steam extraction valve sets in a steam conveying direction, and the steam extraction valve sets are respectively an electric valve C and a check valve C for cutting off steam and avoiding steam from flowing backwards.
In some embodiments of the present application, the soot blowing steam main pipe 28 is sequentially provided with a first valve set, namely a manual valve D, an electric valve D and a regulating valve D, at one end close to the platen superheater outlet header along the steam conveying direction, and the soot blowing steam main pipe 28 is provided with a second valve set at one end close to the boiler soot blowing system for cutting off steam, controlling the flow of steam and preventing steam from flowing backwards.
In some embodiments of the present application, one end of the steam conduit 27 is connected to the rear of the first valve group of the soot blowing steam main 28, the other end of the steam conduit 27 is connected to the first steam extraction conduit 23 and is located behind the steam extraction valve group, and the steam led out from the soot blowing steam main 28 enters the first steam extraction conduit 23 through the steam conduit 27 and enters the first high pressure heater 20 to heat the feedwater.
It should be noted that the steam pipeline 27 is arranged behind the first valve group, the amount of the heating steam delivered to the first high-pressure heater 20 can be controlled by using the valve of the original soot blowing system, and the temperature and pressure of the steam passing through the first valve group are far lower than the design parameters of the No. 1 high-pressure heater, so that the safety margin is large, the reliability is high, the steam pressure is relatively low, the requirements on the pipeline material and the valve are relatively low, the reconstruction difficulty is small, the implementation is easy, and the reconstruction period is short.
In some embodiments of the present application, the steam pipeline 27 is provided with a set of steam valve sets, namely a stop valve a, an electric valve a and a check valve a, at an end close to the soot blowing steam main pipe 28, and a manual stop valve B is provided at an end close to the first steam extraction pipeline 23, and two water drain pipelines are provided in front of and behind the manual stop valve.
It should be noted that, the valve of this application can select suitable valve according to the steam pressure through the pipeline, and the valve is the valve commonly used on the pipeline of general power plant for the closure of control pipeline, the steam flow size in the control pipeline, and prevent steam adverse current, and the drain line mainly used carries out the heating pipe at steam conduit 27 initial stage of commissioning, gets rid of the water that produces after the steam liquefaction in steam conduit 27, avoids the pipeline vibration, or washes steam conduit 27, guarantees the steam quality.
In some embodiments of the present application, a manual primary valve and a manual secondary valve are disposed on both of the two drain pipes for controlling the closed state of the drain pipes.
In summary, the present invention provides a full-load denitration system for a subcritical coal-fired boiler, when a steam turbine 26 is not turned over or turned over to an initial stage of grid connection, when three high-pressure heaters cannot extract steam from the steam turbine 26 or the extracted steam is insufficient and cannot heat feed water, a first valve group of a soot-blowing steam main pipe 28 and all valves on a steam pipeline 27 are opened, so that soot-blowing steam enters a first high-pressure heater 20 through the steam pipeline 27, water in a deaerator 18 absorbs heat through the first high-pressure heater 20, then enters an economizer 2 to absorb heat, and finally enters a boiler drum 19; the water supply is heated by leading out a path of steam on the soot blowing steam main pipe 28, so that the temperature of the water supply entering the economizer 2 can be ensured, when the heat of the water supply absorbing heat in the economizer 2 is less, the heat of the smoke absorbed by the economizer 2 is less, the temperature of the smoke at the outlet of the economizer 2 is less, and the temperature of the smoke entering the SCR denitration device 3 can meet the input condition of a denitration system (more than 310 ℃ and less than 420 ℃), so that the steam turbine 26 can be put into the denitration system before flushing, and full-load denitration in the starting process is realized; when the start-up is completed, the valve on the steam line 27 is closed and the system can be completely withdrawn without any influence on the boiler and the part of the original system of the steam turbine.
In the specific implementation process, a stop valve a, an electric valve a and a check valve a are further sequentially arranged on the steam pipeline 27 along the steam conveying direction.
In the specific implementation process, further, the first steam extraction pipeline 23, the second steam extraction pipeline 24 and the third steam extraction pipeline 25 are sequentially provided with an electric valve and a check valve along the steam delivery direction.
In the specific implementation process, furthermore, two drain pipes are connected to the steam pipe 27, and a manual stop valve B is arranged on the steam pipe 27 between the two drain pipes.
The technical solutions described above only represent the preferred technical solutions of the present invention, and some possible modifications to some parts of the technical solutions by those skilled in the art all represent the principles of the present invention, and fall within the protection scope of the present invention.
Claims (7)
1. A full-load denitration system of a subcritical coal-fired boiler comprises a flue gas pipeline and is characterized in that a denitration structure is installed in the flue gas pipeline;
the denitration structure includes: the device comprises an economizer, an SCR denitration device, a motor, a gear, two slide rails, a rotary spraying disc, a gear ring, a containing groove, a conveying pipe, a plurality of discharging heads, a circulating assembly, a water supply assembly and a steam assembly;
the coal economizer is arranged at the upper end in the flue gas pipeline, the SCR denitration device is arranged at the center in the flue gas pipeline, the motor is arranged at one side of the flue gas pipeline, the driving end is embedded in the flue gas pipeline through a sealing bearing, the gear is arranged at the driving end of the motor, two slide rails are arranged in the flue gas pipeline, the rotary spraying disc is movably embedded in the two slide rails, the gear ring is arranged at the upper end of the rotary spraying disc and is meshed with the gear, the holding groove is arranged in the rotary spraying disc, one end of the conveying pipe penetrates through the flue gas pipeline and is movably embedded at one side of the rotary spraying disc, a plurality of discharging heads are arranged on the rotary spraying disc, the circulating component is arranged at the lower end of the flue gas pipeline, the other end of the conveying pipe is embedded at the upper end of the flue gas pipeline, and one end of the water supply component is connected with the coal economizer, the steam assembly is connected with the water supply assembly.
2. The full-load denitration system of a subcritical coal-fired boiler according to claim 1, wherein the circulation module comprises: the device comprises a three-way control valve, a flue outlet, a detector, a circulating fan and a circulating pipe;
the device comprises a smoke pipeline, a three-way control valve, a smoke outlet flue, a detection meter, a circulating fan, a smoke outlet end, a smoke outlet pipe and a smoke outlet pipe, wherein one end of the three-way control valve is installed at the lower end of the smoke pipeline, the smoke outlet pipe is installed at the lower end of the three-way control valve, the detection meter is installed on the smoke outlet flue, the air inlet end of the circulating fan is connected with one end of the three-way control valve, one end of the circulating pipe is connected with the air outlet end of the circulating fan, and the other end of the circulating pipe is embedded in the smoke pipeline.
3. The full-load denitration system of a subcritical coal-fired boiler according to claim 1, wherein the water supply assembly comprises: a water supply pipeline, a deaerator and a boiler drum;
the water supply pipeline is wound in the economizer, the deaerator is connected to one end of the water supply pipeline, and the boiler drum is connected with the other end of the water supply pipeline.
4. The full-load denitration system of a subcritical coal-fired boiler according to claim 1, wherein the steam assembly comprises: the system comprises a first high-pressure heater, a second high-pressure heater, a third high-pressure heater, a first steam extraction pipeline, a second steam extraction pipeline, a third steam extraction pipeline, a steam turbine, a steam pipeline and a soot blowing steam main pipe;
first high pressure feed water heater, second high pressure feed water heater and third high pressure feed water heater install gradually in on the water supply pipe, first extraction steam pipeline, second extraction steam pipeline and third extraction steam pipeline connect respectively in on first high pressure feed water heater, second high pressure feed water heater and the third high pressure feed water heater, the steam turbine with the other end of first extraction steam pipe, second extraction steam pipeline and third extraction steam pipeline is connected, steam conduit one end with first extraction steam pipeline one side is connected, blow grey steam female pipe with steam conduit connection and both ends respectively with platen superheater export header and boiler blow grey headtotail.
5. The full-load denitration system of a subcritical coal-fired boiler according to claim 4, wherein a stop valve A, an electric valve A and a check valve A are arranged on the steam pipeline in sequence along the steam conveying direction.
6. The full-load denitration system of the subcritical coal-fired boiler according to claim 4, wherein the first steam extraction pipeline, the second steam extraction pipeline and the third steam extraction pipeline are sequentially provided with an electric valve B and a check valve B along the steam conveying direction.
7. The full-load denitration system of the subcritical coal-fired boiler according to claim 4, wherein two drainage pipes are connected to the steam pipe, and a manual stop valve B is arranged on the steam pipe between the two drainage pipes.
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| CN113893683B (en) | 2023-10-20 |
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