CN106871102B - The denitrating technique of full load - Google Patents
The denitrating technique of full load Download PDFInfo
- Publication number
- CN106871102B CN106871102B CN201611238036.9A CN201611238036A CN106871102B CN 106871102 B CN106871102 B CN 106871102B CN 201611238036 A CN201611238036 A CN 201611238036A CN 106871102 B CN106871102 B CN 106871102B
- Authority
- CN
- China
- Prior art keywords
- economizer
- temperature
- water supply
- water
- entrance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways
- F22D1/12—Control devices, e.g. for regulating steam temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- 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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
This application provides a kind of denitrating techniques of full load.The denitrating technique is implemented using fired power generating unit, fired power generating unit includes system of high and low pressure bypasses, boiler and steam turbine system, boiler includes circulating pump and economizer, steam turbine system includes steam turbine and the high-pressure heater that is arranged in steam turbine, the connection of the entrance of circulating pump and economizer and the entrance delivery pump water supply to economizer, the connection of the entrance of high-pressure heater and economizer simultaneously adds to water to the entrance of economizer conveying height, height adds to water and pump water supply forms the water supply of economizer entrance, wherein, denitrating technique includes: that control height adds to the temperature of water more than or equal to 160 DEG C, and/or the temperature of control pump water supply is greater than or equal to 280 DEG C, so that the temperature of economizer entrance water supply is greater than or equal to 265 DEG C.The denitrating technique does not need to carry out any transformation to the equipment of fired power generating unit, does not need improvement cost, so that it may realize the full load denitration under low cost.
Description
Technical field
This application involves coal-burning power plant denitration fields, in particular to a kind of denitrating technique of full load.
Background technique
Dedusting, desulfurization whole process qualified discharge technology are mature in domestic large size three environmental protection indexs of fossil-fired unit, SCR
Denitrification process is limited, unit load (usual < 40% by catalyst reaction temperatures (could react at 280 DEG C -420 DEG C)
BMCR) flue-gas temperature at SCR denitration equipment entrance is unable to reach catalyst stabilization operating temperature, and SCR can not carry out denitration, combustion
The NOx emission value of coal fired power generating unit is exceeded.
To expand the load setting that fired power generating unit denitration is run, so that unit is also able to achieve denitration, mesh in wider load
Before generally use economizer bypass flue or economizer is split before and after SCR, while being aided with steam turbine side and add high-pressure heater and mentioning
The modification scheme of feed temperature is risen, realizes the wide load denitration target of unit.
Denitration load is thrown after most Transformation of Unit is down to 10%BMCR-30%BMCR；Case Subcritical Units are implemented
Economizer large scale splits transformation, extremely shuts down full load denitration before set grid-connection may be implemented, but there are grid-connected on-load initial stages
And hidden danger is shut down in the low MFT movement of economizer vaporization steam water-level before shutting down off-the-line, unit reliability reduces.Also, it is above-mentioned
The investment of modification scheme is huge, and engineering construction influences unit and utilizes the time.
Summary of the invention
The main purpose of the application is to provide a kind of denitrating technique of full load, to solve denitration work in the prior art
Skill can not reach the problem of low cost and full load simultaneously.
To achieve the goals above, according to the one aspect of the application, a kind of denitrating technique of full load is provided, this is de-
Nitre technique is implemented using fired power generating unit, and above-mentioned fired power generating unit includes system of high and low pressure bypasses, boiler and steam turbine system, above-mentioned boiler
Including circulating pump and economizer, above-mentioned steam turbine system includes steam turbine and the high-pressure heater that is arranged in above-mentioned steam turbine, above-mentioned to follow
Ring pump is connect and the entrance delivery pump water supply to above-mentioned economizer with the entrance of above-mentioned economizer, above-mentioned high-pressure heater with it is above-mentioned
The entrance of economizer connects and adds to water to the entrance of above-mentioned economizer conveying height, and above-mentioned height adds to water and formed with said pump water supply
Economizer entrance water supply, wherein above-mentioned denitrating technique includes: that the above-mentioned height of control adds to the temperature of water and is greater than or equal to 160 DEG C,
And/or the temperature of control said pump water supply is greater than or equal to 280 DEG C, so that the temperature of above-mentioned economizer entrance water supply is greater than or waits
In 265 DEG C.
Further, above-mentioned denitrating technique further include: control above-mentioned height add to water flow account for above-mentioned economizer entrance to
The 10%~30% of the flow of water.
Further, above-mentioned boiler starts simultaneously with above-mentioned system of high and low pressure bypasses, and above-mentioned system of high and low pressure bypasses is to upper
It states the water in high-pressure heater and carries out being thermally formed height and add to water, above-mentioned denitrating technique further include: control above-mentioned height and add to water
Temperature is between 160~200 DEG C.
Further, above-mentioned steam turbine system includes feed pump, above-mentioned high-pressure heater and above-mentioned feed pump and above-mentioned height
Low-pressure bypass system is all connected with, and above-mentioned feed pump is conveyed to above-mentioned high-pressure heater and pumped, above-mentioned system of high and low pressure bypasses output
Steam above-mentioned height be thermally formed to above-mentioned water pumping add to water, control the pressure of above-mentioned steam between 0.7~1.1MPa.
Further, the temperature of said pump water supply is controlled between 280~300 DEG C.
Further, the pressure controlled in above-mentioned boiler is greater than or equal to 6.0MPa, so that the temperature of said pump water supply is big
In or equal to 280 DEG C.
Further, control above-mentioned height add to water flow account for above-mentioned economizer entrance water supply flow 10%~
20%.
Further, above-mentioned system of high and low pressure bypasses includes low voltage bypass, when the pressure in above-mentioned low voltage bypass rises to
When more than or equal to 0.5MPa, start above-mentioned high-pressure heater.
Using the technical solution of the application, it is only necessary to which the high temperature for adding to water of control is more than or equal to 160 DEG C and/or simultaneously
The temperature of control pump water supply is greater than or equal to 280 DEG C, so that the temperature of above-mentioned economizer entrance water supply is greater than or equal to 265 DEG C
It can realize the full load denitration of fired power generating unit, and the denitrating technique does not need to carry out any change to the equipment of fired power generating unit
It makes, does not need improvement cost, realize the full load denitration under low cost.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.In the accompanying drawings:
Fig. 1 shows the structural schematic diagram of 1 fired power generating unit according to an embodiment of the present application.
Wherein, the above drawings include the following reference numerals:
10, boiler body；11, SCR denitration equipment；12, superheater；13, reheater；14, economizer；15, separator；
16, circulating pump；21, No. 1 high-pressure heater；22, No. 2 high-pressure heaters；23, No. 3 high-pressure heaters；24, high pressure cylinder；25, in
Cylinder pressure；26, low pressure (LP) cylinder；27, condenser；28, condensate pump；29, oxygen-eliminating device；30, feed pump.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
As background technique is introduced, denitrating technique in the prior art can not reach inexpensive and complete negative simultaneously
Lotus, in order to solve technical problem as above, present applicant proposes a kind of denitrating techniques of full load.
In a kind of typical embodiment of the application, a kind of denitrating technique of full load, above-mentioned fired power generating unit are provided
It including system of high and low pressure bypasses, boiler and steam turbine system, is connected between boiler and steam turbine by system of high and low pressure bypasses, above-mentioned boiler
Including circulating pump and economizer, above-mentioned steam turbine system include steam turbine and the high-pressure heater that is arranged in above-mentioned steam turbine, it is above-mentioned to follow
Ring pump is connect and the entrance delivery pump water supply to above-mentioned economizer with the entrance of above-mentioned economizer, above-mentioned high-pressure heater with it is above-mentioned
The entrance of economizer connects and adds to water to the entrance of above-mentioned economizer conveying height, and above-mentioned height adds to water and formed with said pump water supply
Economizer entrance water supply, above-mentioned denitrating technique include: that the above-mentioned height of control adds to the temperature of water more than or equal to 160 DEG C and/or controls
The temperature of said pump water supply processed is greater than or equal to 280 DEG C, so that the temperature of above-mentioned economizer entrance water supply is greater than or equal to 265
DEG C, since the economizer entrance water supply and flue gas exchange heat in economizer, also, the water supply of economizer entrance is as cold source,
Flue gas is as heat source, so that the temperature of economizer entrance water supply is greater than or equal to 265 DEG C, so that at SCR denitration equipment entrance
The temperature of flue gas is higher, ensure that going on smoothly for denitration reaction, realizes full load denitration, and the full load in the application refers to hair
Motor starts power generation to shutdown and stops.
In the denitrating technique of the application, it is only necessary to which the temperature that control height adds to water is greater than or equal to 160 DEG C and/or same time control
The temperature of system pump water supply is greater than or equal to 280 DEG C, so that the temperature of above-mentioned economizer entrance water supply is greater than or equal to 265 DEG C,
The temperature of the flue gas of SCR device inlet can be made higher, and then improve a possibility that denitration reaction occurs, realize fire
The full load denitration of motor group, and the denitrating technique does not need to carry out any transformation to the equipment of fired power generating unit, does not need to change
This is caused, the full load denitration under low cost is realized.
The high temperature for adding to water can be individually controlled in the application according to the actual situation and is greater than or equal to 160 DEG C, Huo Zhedan
Solely control control said pump water supply temperature be greater than or equal to 280 DEG C, can also control simultaneously above-mentioned height add to water temperature it is big
It is greater than or equal to 280 DEG C in or equal to the temperature of 160 DEG C and said pump water supply.
In one of the application embodiment, in above-mentioned denitrating technique, while controlling above-mentioned height and add to the temperature of water and being greater than
The temperature of 160 DEG C and said pump water supply is greater than 280 DEG C, so that it may the temperature of economizer entrance water supply are relatively easily greater than 265
DEG C, realize full load denitration, and can also guarantee that denitrating technique safely and conveniently carries out.
Height in the application adds to the flow of water and the flow of pump water supply can be any ratio, those skilled in the art
It can ratio both determines according to actual conditions.Requirement height adds to the flow of water in the application and boiler evaporating falls corresponding stream
Amount be it is identical, forbid discharging water from boiler separator, pass through said pump water flow guarantee safe operation of the boiler.
In a kind of embodiment of the application, above-mentioned denitrating technique further include: control above-mentioned height add to water flow account for it is above-mentioned
The 10%~30% of the flow of economizer entrance water supply.The evaporation capacity of general boiler account for the flow of economizer entrance water supply 10~
30%, so the flow control that height is added to water is within this range, it can guarantee that economizer entrance feed temperature reaches SCR fortune
Trip temperature requirement.
In another embodiment of the application, from it is different in the prior art (be not in the prior art in hp and lp bypass
System start while put into above-mentioned high-pressure heater), above-mentioned system of high and low pressure bypasses to the water in above-mentioned high-pressure heater into
Row is thermally formed the height of higher temperature and adds to water, above-mentioned denitrating technique further include: control above-mentioned height add to the temperature of water 160~
Between 200 DEG C.May further ensure that the temperature of economizer entrance water supply in this way can be easier to control to 265 DEG C or more,
And then realize full load denitration.
In the another embodiment of the application, above-mentioned steam turbine system includes feed pump, and above-mentioned high-pressure heater is given with above-mentioned
Water pump and above-mentioned system of high and low pressure bypasses are all connected with, and above-mentioned feed pump is conveyed to above-mentioned high-pressure heater and pumped, above-mentioned height
The steam of pressure bypath system output is thermally formed above-mentioned height to above-mentioned water pumping and adds to water, control the pressure of above-mentioned steam 0.7~
Between 1.1MPa, i.e., when the pressure of the steam of low voltage bypass is between 0.7~1.1MPa, then the steam is used to add the water of steam turbine
The temperature of high price water supply can thus be controlled and be greater than or equal to 160 DEG C, then further ensure full load denitration by heat
The realization of technique.
In order to which the control of the temperature of economizer entrance water supply between 265 DEG C~280 DEG C, is further ensured that economizer exit
The temperature of flue gas reaches SCR reaction temperature, in a kind of embodiment of the application, the temperature of said pump water supply 280~300 DEG C it
Between.
In another embodiment of the application, the pressure controlled in above-mentioned boiler is greater than or equal to 6.0MPa, so that above-mentioned
The temperature for pumping water supply is greater than or equal to 280 DEG C.Only needing in this way can be so that pumps water supply by the pressure in control boiler
Temperature is greater than or equal to 280 DEG C, further ensures full load denitration.
In order to enable circulation pump high volume circulation, and then it is effectively prevented from economizer vaporization vibration, meanwhile, it is further ensured that
The realization of full load denitrating technique in a kind of embodiment of the application, controls above-mentioned height and adds to the flow of water and account for above-mentioned economizer
The 10%~20% of the flow of entrance water supply.And the subcritical vapour that full load denitration is realized in transformation is split relative to by economizer
For packet furnace (there are economizer gasifying boiler tripping hidden danger, threaten equipment safety), which can eliminate set grid-connection on-load
The low MTF of initial stage steam water-level acts hidden danger.
In another preferred embodiment of the application, control above-mentioned height add to water temperature be greater than or equal to 160 DEG C and
The temperature for controlling said pump water supply is greater than or equal to 280 DEG C, while controlling above-mentioned height and add to the flow of water and accounting for above-mentioned economizer and enter
Between the 10~20% of the flow of mouth water supply, it not only can guarantee to realize that low denitration even takes off entirely in a manner of low cost
Nitre, it can also be ensured that the reliability of unit.
In order to further such that the high temperature for adding to water reaches 190 DEG C, and then guarantee full load or whole de- quickly
The realization of nitre, in a kind of embodiment of the application, above-mentioned system of high and low pressure bypasses includes low voltage bypass, when in above-mentioned low voltage bypass
Pressure when rising to more than or equal to 0.5MPa, start above-mentioned high-pressure heater, above-mentioned low voltage bypass pressure reaches 1.1Mpa
When, height adds to coolant-temperature gage and reaches 190 DEG C.
The technical solution of the application is practical to be specifically included that
Control oxygen-eliminating device temperature:
Ignition of the boiler to set grid-connection on-load initial stage, auxiliary steam heats 105 DEG C -130 DEG C of oxygen-eliminating device water temperature, shut down
Journey parameter is identical, and oxygen-eliminating device water temperature is adjusted with boiler parameter.
Promote high-pressure heater feed temperature:
Large turbine-generator set heat regenerative system designs 1 cold steam supply high-pressure heater again；
Most crew qiting 30%BMCR-100%BMCR capacity system of high and low pressure bypasses, to cooperate steam turbine (steamer
Machine) intermediate pressure cylinder start-up or combination of HP cylinder with IP cylinder.
Low voltage bypass (cold hot arc again) steam supply puts into 1 high-pressure heater, feed temperature before steam turbine constant speed before steam turbine red switch
It is promoted to 160 DEG C -200 DEG C；For 1 high-pressure heater is completed as the occasion requires for the unit of vapor reformation, auxiliary steam pressure is promoted to
0.8Mpa-1.2Mpa, HP heater drainage arrange condenser；Stopping process is all high to add continuous operation.
It opens machine promotion height and adds to coolant-temperature gage, boiler startup phase evaporation amount is opposite to be increased, and each heating surface of boiler is effectively improved
Service condition is conducive to that local overheating and oxide skin is avoided to be formed.
Promote economizer entrance feed temperature:
Unit starting boiler heating boost phase, keep economizer big flow, control height add to water flow (that is,
The evaporation capacity of boiler) account for the 10%~20% of economizer entrance total Feedwater Flow, 265 DEG C of > of economizer entrance feed temperature, greatly
Flow circulation can effectively avoid economizer vaporization vibration.It is hidden that the low MTF movement of set grid-connection on-load initial stage steam water-level can be eliminated
Suffer from；The control strategy for shutting down parameter is identical.
Before set grid-connection and shut down denitration continuous operation before off-the-line:
Economizer circular flow is adjustable, and SCR inlet smoke temperature is controllable, keeps 290 DEG C of SCR inlet flue-gas temperature >, and denitration connects
Reforwarding row.For supercritical DC furnace, hygrometric state turns direct current dry state, answers timely load up to 40% or more, maintains SCR inlet flue gas
290 DEG C of temperature >, the low denitration of smoke temperature in short-term is avoided to exit.Stopping process boiler turns hygrometric state by direct current dry state, starts furnace water in time
Circulating pump gradually increases flow, keeps 290 DEG C of SCR inlet flue-gas temperature >.
The technical solution of the application is that the operation based on the big power equipment plant's exemplary thermal system implementation in the country three is excellent
Change, core is that economizer inlet flow rate is adjustable, temperature-controllable, does not need the system reform to most of active service supercritical units, real
Applying above technical scheme can be realized full load denitration, save a large amount of improvement expenses, realize green power generation target.
Also, the technical solution of the application avoids large-scale redevelopment from guaranteeing that unit utilizes hour；For configuration circulating pump
Overcritical million unit is not required to split economizer transformation, can also realize full load denitration；To subcritical forced circulation drum boiler,
It does not need implementation economizer and splits transformation, full load denitration only can be realized to economizer recirculation conduit increase-volume；Improvement expenses
Low, the method for operation is flexible, can eliminate the low MTF movement hidden danger of set grid-connection on-load initial stage economizer vaporization steam water-level.
In order to enable those skilled in the art can clearly understand the technical solution of the application, below with reference to tool
The embodiment of body illustrates the technical solution of the application.
Embodiment 1
There are four 660MW supercritical coal-fired units (one of fired power generating unit) with model in the Hami Shenhua Guo Neng power plant,
Respectively No. 1 unit, No. 2 units, No. 3 units and No. 4 units, the structure of every unit is as shown in Figure 1, the model unit equipment
Type selecting is as follows:
Boiler:
This project installation Shanghai electric group 4 × 660MW supercritical tower-type direct current cooker, model: SG-2236/25.4-
Garden burning, oscillating nozzle temperature adjustment, single reheat, balanced draft, dry type dragveyer are cut in M6007, spirally-wound tubes, single burner hearth, quadrangle
Boiler with dry bottom furnace.Design uses local soft coal, and boiler includes boiler body 10, boiler further include economizer 14 and after
1 three points of storehouse Ljungstrom air heater is respectively arranged in the SCR denitration equipment 11 of arrangement, lower part two sides.
Boiler plant design feature:
Every boiler configures 6 coal pulverizers, under the working condition of BMCR (boiler maximum continuous rating), 5 coal pulverizers
Operation, 1 coal pulverizer received shipment row；Wherein, the A mill burner of lower portion thereof and B grind burner configuration plasma ignition device, and
Guarantee boiler overall performance.
Every boiler manufactures circulating pump 16 with a KSB, for guaranteeing starting to water-cooling wall hydrodynamic force before pure direct current dry state
Safety, design discharge 30%BMCR (671t/h).
Crew qiting two-stage series connection hp by-pass system and low-pressure bypass system, by 30% rated capacity (rated capacity
That is boiler evaporation capacity) configuration.
Denitrification apparatus: using purity is 99.6% liquefied ammonia as denitration reaction agent, cellular 2+1 layers of catalyst, BMCR
Operating condition design entrance NOx content 500mg/Nm3, denitration efficiency > 80%, outlet NOx emission concentration < 100mg/Nm3, SCR is continuous
290 DEG C of smoke temperature > of operation.
Boiler parameter before unit cold start red switch: design system of high and low pressure bypasses automatically controls, and superheater 12 (is boiler
The heat exchanger of outlet, this steam introduce steam turbine acting, and design has bypass duct, i.e. high pressure turbine by, next stage before entering steam turbine
Pressure configuration low voltage bypass, Boiler Steam can drain into steam turbine cooling system by system of high and low pressure bypasses and be condensed into water) outlet
Pressure is up to 8.4~8.9MPa, and 380 DEG C of Stream temperature degree, 340 DEG C of reheat steam temperature, vapor (steam) temperature matches with steam turbine, and boiler further includes
Reheater 13 and separator 15.
Steam turbine ontology:
Steam turbine is that the overcritical of east steam turbine factory manufacture, a resuperheat, single shaft, three cylinders, four steam discharge and Direct Air-Cooled are solidifying
Vapour formula steam turbine, model: NZK660-24.2/566/566.
Steam turbine equipment design feature:
7 grades of unit design non-adjustment regenerative steams, 3 high-pressure heater (21, No. 2 high pressures of respectively No. 1 high-pressure heater
Heater 22 and No. 3 high-pressure heater 23), condenser 27, condensate pump 28, oxygen-eliminating device 29, feed pump 30, high pressure cylinder 24, in
Cylinder pressure 25, low pressure (LP) cylinder 26 and 3 low-pressure heater (not shown in figure 1), wherein 3 high-pressure heaters respectively with above-mentioned steam turbine
And the connection of above-mentioned boiler, the cold reheating of high pressure cylinder steam discharge is to No. 2 high-pressure heater steam supplies therein, and No. 2 high-pressure heaters
Outlet is connect with the entrance of economizer 14, adds to water to the entrance of economizer 14 conveying height.
Unit is using bypath system cooperation high pressure cylinder 24 and 25 combined launch of intermediate pressure cylinder, main vapour before cold start steam turbine red switch
Pressure 8.73Mpa, 390 DEG C of Stream temperature degree, reheat pressure 1.1Mpa, 240 DEG C of cold reheat steam temperature, reheat heat vapor (steam) temperature
340℃.Cold start high pressure cylinder 24 is warmed to set grid-connection 10 hours in advance, and set grid-connection to 40% load is thrown denitration 5 hours.
Denitration is thrown before No. 3 set grid-connections:
On July 27th, 2016 Hami No.3 in Power Plant unit starting is enabled by state's net scheduling, throws denitration side before implementing set grid-connection
Case:
29 continuously deoxidizing of oxygen-eliminating device, water temperature control 110 DEG C -120 DEG C；
Promote the outlet feed temperature of No. 2 high-pressure heaters:
30 divide when 27 days 00 July, No. 3 furnace ignitings, and low voltage bypass (cold reheating) pressure reaches 0.5Mpa, put into No. 2 high pressures
Heater.40 divide when 4, and low voltage bypass (cold reheating) pressure reaches design value 1.1Mpa, the water supply of No. 2 high-pressure heaters 22 outlet
Temperature (height adds to water) reaches 193 DEG C.
Promote the feed temperature of circulating-pump outlet:
Boiler circulation pump 16 puts into operation before lighting a fire, and keeps pump discharge circular flow 550t/h.49 divide at 27 days 5,3A mill
Plasmon modes operation, coal amount 40t/h, boiler boost to 6.3Mpa, and water supply (i.e. pump water supply) temperature that circulating pump 16 exports is
281 DEG C, circulating pump 16 keeps big flow so that height add to the flow of the water water of outlet (No. 2 high-pressure heaters) and said pump to
The ratio of the flow of water is 7:37.
After pump water supply is mixed with height plus water, the temperature of economizer entrance water supply reaches 267 DEG C.
Denitration is thrown before steam turbine red switch
50 divide at 27 days 5, and SCR inlet flue-gas temperature reaches 297 DEG C before No. 3 steam turbine red switch, and denitration puts into operation, and boiler is each
Portion's smoke temperature is steady.When 6, smokestack NOx is down to 75mg/Nm3, stable in 20mg/Nm later3；30 divide when 6, No. 3 machine red switch.50 when 12
Point, No. 3 set grid-connections, denitration Parameter Stationary；Unit load up opens mill ventilation, there is 3 minutes super 100mg/Nm of NOx3.When 15, machine
Group load up to 240MW, become a cadre state by boiler, keeps 297 DEG C of SCR inlet smoke temperature >, denitrating system Parameter Stationary, and smokestack NOx is steady
It is scheduled on 40mg/Nm3Within.
Embodiment 2
State, Shenhua can throw denitration before the Power Plant No.1 set grid-connection of Hami
Hami Power Plant No.1 unit starting is enabled by state's net scheduling on July 27th, 2016, denitration puts into operation before set grid-connection,
It is grid-connected to 40% load smokestack NOx qualified discharge.
Embodiment 3
State, Shenhua can the continuous denitration of Hami Power Plant No.1 unit shutdown at sliding parameters
Before National Day in 2016, connecing state's tune center, to enable the unit September 26 days of Hami 1 shut down after evening peak spare, implements to stop
The continuous denitration scheme of machine process.
Boiler turns hygrometric state starting boiler water circulating pump and promotes economizer inlet water temperature, denitration continuous operation:
40 divide at September 26 days 22, and for No. 1 unit drop power output to 30% (200MW), boiler turns hygrometric state, economizer entrance water supply
219 DEG C of temperature, 297 DEG C of SCR inlet smoke temperature, start boiler water circulating pump；50 divide when 22, unit drop power output to 15% (100MW), main
Vapor (steam) temperature slides to 430 DEG C, and 209 DEG C of Gao Jiahou feed temperature, boiler water circulating pump flow is adjusted to 440t/h, economizer entrance water supply
Temperature is promoted to 277 DEG C, 291 DEG C of SCR inlet smoke temperature (denitration producer regulation: 280 DEG C of denitration continuous operation ≯ 4 of SCR inlet smoke temperature
Hour), denitration continuous operation.
Denitration is out of service before beating gate stop-start:
52 divide at September 26 days 22, to avoid remaining ammonia in SCR catalyst, make the spray ammonia valve of closing in 14 minutes before gate stop-start,
292 DEG C of SCR inlet smoke temperature, exit denitration.06 divides when 22, and No. 1 unit drop power output beats gate stop-start, boiler flameout to 6% (40MW)
Purging.
The unit whole process denitrification test conclusion of Hami 1:
Hami Power Plant No.1 unit on July 27th, 2016 starts, and 1500rpm denitration puts into operation before set grid-connection, September 26
It is out of service to shut down off-the-line denitration day, realizes supercritical coal-fired units start and stop full load denitration target.
Embodiment 4
State, Shenhua can throw denitration before the Power Plant No.1 set grid-connection of Ewenki
Ewenki Installation in Plant 2 × 600MW supercritical coal-fired units, boiler configure 1 starting 30%BMCR capacity circulating
Pump, hp by-pass system and low-pressure bypass system, in steam turbine high pressure cylinder and intermediate pressure cylinder combined launch (refer to steam turbine from it is static to
Constant speed 3000rpm process high pressure cylinder, intermediate pressure cylinder are simultaneously into steam).On September 2nd, 2016 enables Ewenki Power Plant No.1 machine by scheduling
Group starting throws denitrification test before reference Hami power plant technical solution implementation is grid-connected:
It promotes height and adds to coolant-temperature gage:
To prevent and treat boiler oxidation skin, Ewenki implementation in power plant as the occasion requires be transformed for #1 high-pressure heater by auxiliary steam before this,
This time start, auxiliary steam pressure 0.7Mpa, 160 DEG C of feed temperature of height plus outlet.
The temperature for promoting the water supply of economizer entrance throws denitration:
Boiler pressure 11.5Mpa pumps 310 DEG C of feed temperature, and it is more fixed than about 4:1, steam turbine that pump water supply and height add to water flow
Fast 3000rpm, main vapour pressure 11.0Mpa, 280 DEG C of economizer exit water temperature, SCR inlet flue-gas temperature reaches 320 DEG C, and denitration is thrown
Enter operation.Unit on-load is become a cadre before and after state, and feedwater flow increases, and the low denitration of SCR inlet smoke temperature is out of service in short-term, and unit is negative
Lotus rises to 40%, and denitration puts into operation again.
Embodiment 5
The difference from embodiment 1 is that promoting the outlet feed temperature of No. 2 high-pressure heaters:
30 divide when 27 days 00 July, No. 3 furnace ignitings, and low voltage bypass (cold reheating) pressure reaches 0.5Mpa, put into second height
Press heater.40 divide when 4, and low voltage bypass (cold reheating) pressure reaches design value 0.8Mpa, the water supply of No. 2 high-pressure heaters outlet
Temperature (height adds to water) reaches 160 DEG C.
Promote the mouth feed temperature that circulation pumps out:
Boiler circulation pump puts into operation before lighting a fire, and keeps pump discharge circular flow 550t/h.49 divide at 27 days 5,3A mill etc.
Ion mode operation, coal amount 40t/h, boiler boost to 8.3Mpa, and water supply (i.e. pump water supply) temperature of circulating-pump outlet is 296
DEG C, circulating pump keeps big flow, so that the high flow of water and the ratio of the flow of said pump water supply of adding to is 1:9.
After pump water supply is mixed with height plus water, the temperature of economizer entrance water supply reaches 272.6 DEG C.
Denitration is thrown before steam turbine red switch
50 divide at 27 days 5, and No. 3 unit SCR denitration equipment entrance flue-gas temperatures reach 297 DEG C, and denitration puts into operation, boiler
Each portion's smoke temperature is steady.When 6, smokestack NOx is down to 75mg/Nm3, stable in 20mg/Nm later3；30 divide when 6, No. 3 machine red switch.When 12
50 points, No. 3 set grid-connections, denitration Parameter Stationary；Unit load up opens mill ventilation, there is 3 minutes super 100mg/Nm of NOx3.When 15,
Unit load up to 240MW, become a cadre state by boiler, keeps 297 DEG C of SCR inlet smoke temperature >, denitrating system Parameter Stationary, smokestack NOx
Stablize in 40mg/Nm3Within.
Thermal power plant's 4 hours necessary conditions of SCR denitration continuous operation are 280 DEG C of flue-gas temperature >, and adequate condition is flue gas
290 DEG C of temperature >, this technology route, which is taken, promotes the running temperature that economizer inlet water temperature meets SCR denitration equipment, at 3
600MW grade supercritical coal unit embodiment, works well, wherein before the unit completion of Hami 1 of embodiment 3 is grid-connected
To the denitration of off-the-line full load is shut down, there is commonly used value in same type units.
It can be seen from the above description that the application the above embodiments realize following technical effect:
In the denitrating technique of the application, it is only necessary to which the temperature that control height adds to water is greater than or equal to 160 DEG C and/or same time control
The temperature of system pump water supply is greater than or equal to 280 DEG C, so that the temperature of above-mentioned economizer entrance water supply is greater than or equal to 265 DEG C,
The temperature of the flue gas of SCR device inlet can be made higher, and then improve a possibility that denitration reaction occurs, realize fire
The full load denitration of motor group, and the denitrating technique does not need to carry out any transformation to the equipment of thermal motor system group, is not required to
Improvement cost is wanted, the full load denitration under low cost is realized, to the thermal power plant's coal dust for realizing that State Ministry of Environmental Protection in 2016 proposes
Throwing denitration in 3 hours requires to provide technical strategies after ignition of the boiler.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Claims (8)
1. a kind of denitrating technique of full load, the denitrating technique is implemented using fired power generating unit, and the fired power generating unit includes height
Press bypath system, boiler and steam turbine system, the boiler includes circulating pump and economizer, and the steam turbine system includes steam turbine and set
The high-pressure heater in the steam turbine is set, the circulating pump is connect with the entrance of the economizer and entering to the economizer
Mouth delivery pump water supply, the high-pressure heater connect with the entrance of the economizer and add to the conveying of the entrance of the economizer is high
Water supply, the height add to water and pump water supply formation economizer entrance water supply, which is characterized in that the denitrating technique includes:
Control the height add to water temperature be greater than or equal to 160 DEG C, and/or
The temperature for controlling the pump water supply is greater than or equal to 280 DEG C, so that the temperature of the economizer entrance water supply is greater than or waits
In 265 DEG C.
2. denitrating technique according to claim 1, which is characterized in that the denitrating technique further include:
Control the height add to water flow account for the economizer entrance water supply flow 10%~30%.
3. denitrating technique according to claim 1, which is characterized in that the boiler and the system of high and low pressure bypasses are simultaneously
Starting, the system of high and low pressure bypasses carries out being thermally formed height to the water in the high-pressure heater adds to water, the denitration work
Skill further include:
It controls the height and adds to the temperature of water between 160~200 DEG C.
4. denitrating technique according to claim 1, which is characterized in that the steam turbine system includes feed pump, the high pressure
Heater is all connected with the feed pump and the system of high and low pressure bypasses, and the feed pump is conveyed to the high-pressure heater
It pumps, the steam of the system of high and low pressure bypasses output is thermally formed the height to the water pumping and adds to water, controls the steam
Pressure between 0.7~1.1MPa.
5. denitrating technique according to claim 1, which is characterized in that the temperature of the control pump water supply is at 280~300 DEG C
Between.
6. denitrating technique according to claim 1, which is characterized in that the pressure controlled in the boiler is greater than or equal to
6.0MPa, so that the temperature of the pump water supply is greater than or equal to 280 DEG C.
7. denitrating technique according to claim 2, which is characterized in that control the height and add to the flow of water and account for province's coal
The 10%~20% of the flow of device entrance water supply.
8. denitrating technique according to claim 1, which is characterized in that the system of high and low pressure bypasses includes low voltage bypass,
When the pressure in the low voltage bypass rises to more than or equal to 0.5MPa, start the high-pressure heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611238036.9A CN106871102B (en) | 2016-12-28 | 2016-12-28 | The denitrating technique of full load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611238036.9A CN106871102B (en) | 2016-12-28 | 2016-12-28 | The denitrating technique of full load |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106871102A CN106871102A (en) | 2017-06-20 |
| CN106871102B true CN106871102B (en) | 2019-05-24 |
Family
ID=59164470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611238036.9A Active CN106871102B (en) | 2016-12-28 | 2016-12-28 | The denitrating technique of full load |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106871102B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107149873B (en) * | 2017-06-27 | 2023-09-01 | 北京国能中电节能环保技术股份有限公司 | Energy-saving full-load denitration system |
| CN107270274B (en) * | 2017-07-10 | 2021-12-14 | 江苏大唐国际吕四港发电有限责任公司 | Novel starting mode of ultra-supercritical coal-fired unit realizes unit full-load denitration input |
| CN108613164A (en) * | 2018-04-08 | 2018-10-02 | 大唐(北京)能源管理有限公司 | The feed heating system of denitration effect under a kind of improvement underload |
| JP6553271B1 (en) * | 2018-10-15 | 2019-07-31 | 三菱日立パワーシステムズ株式会社 | CONTROL DEVICE FOR POWER PLANT, CONTROL METHOD THEREOF, CONTROL PROGRAM, AND POWER PLANT |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000240404A (en) * | 1999-02-22 | 2000-09-05 | Babcock Hitachi Kk | Thermal electric power plant |
| CN103836607A (en) * | 2014-03-05 | 2014-06-04 | 华电电力科学研究院 | Operating temperature control device for SCR (semiconductor control rectifier) denitration reactor of thermal power plant and control method of operating temperature control device |
| CN104028104B (en) * | 2014-06-24 | 2016-01-13 | 中国电力工程顾问集团华东电力设计院有限公司 | Be provided with denitrification apparatus and the generating set of economizer recirculating system |
| CN105889899A (en) * | 2014-12-16 | 2016-08-24 | 华北电力大学（保定） | Superheated steam temperature adjusting system and method suitable for SCR low-load operation |
-
2016
- 2016-12-28 CN CN201611238036.9A patent/CN106871102B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000240404A (en) * | 1999-02-22 | 2000-09-05 | Babcock Hitachi Kk | Thermal electric power plant |
| CN103836607A (en) * | 2014-03-05 | 2014-06-04 | 华电电力科学研究院 | Operating temperature control device for SCR (semiconductor control rectifier) denitration reactor of thermal power plant and control method of operating temperature control device |
| CN104028104B (en) * | 2014-06-24 | 2016-01-13 | 中国电力工程顾问集团华东电力设计院有限公司 | Be provided with denitrification apparatus and the generating set of economizer recirculating system |
| CN105889899A (en) * | 2014-12-16 | 2016-08-24 | 华北电力大学（保定） | Superheated steam temperature adjusting system and method suitable for SCR low-load operation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106871102A (en) | 2017-06-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106871102B (en) | The denitrating technique of full load | |
| RU2009333C1 (en) | Combined steam-gas power plant and method of its operation | |
| CN106089341B (en) | Method for enhancing cold steam turbine startup in a multi-gas turbine combined cycle plant | |
| CN107747503A (en) | A kind of system and operation method of Thermal generation unit Ultra-low load operation | |
| US20060162315A1 (en) | Waste heat steam generator | |
| US8387356B2 (en) | Method of increasing power output of a combined cycle power plant during select operating periods | |
| US20120037097A1 (en) | High efficiency feedwater heater | |
| KR101610613B1 (en) | Fossil-fuel power plant and fossil-fuel power plant operation method | |
| US20110247335A1 (en) | Waste heat steam generator and method for improved operation of a waste heat steam generator | |
| US20130269346A1 (en) | Combined cycle power plant with co2 capture and method to operate it | |
| CN109312635B (en) | Condensate recirculation | |
| US20190093563A1 (en) | Fuel preheating system for a combustion turbine engine | |
| CN108843414B (en) | Working method for coupling and decoupling nuclear energy and conventional energy with reheating power generation system | |
| WO2018198836A1 (en) | Power generation plant and operation method therefor | |
| KR102485852B1 (en) | Waste gas recirculation in gas and steam combined turbine plants | |
| CN108613165A (en) | Come into operation the control method of denitrification apparatus before a kind of fired power generating unit startup stage is grid-connected | |
| JP2017172580A (en) | Composite cycle power generation plant and method for operating this composite cycle power generation plant | |
| JP4718333B2 (en) | Once-through exhaust heat recovery boiler | |
| JPH1113488A (en) | Full fired heat recovery combined plant using steam cooling type gas turbine | |
| CN209115164U (en) | The system of nuclear energy coupling gas turbine power generation based on depth UTILIZATION OF VESIDUAL HEAT IN | |
| CN107075977B (en) | Low load turndown for combined cycle power plant | |
| CN208280995U (en) | Turbo-generator Set with direct-burning heating | |
| JP2004092426A (en) | Cogeneration method and cogeneration system | |
| JP2019173696A (en) | Combined cycle power generation plant, and operation method of the same | |
| JP2019065811A (en) | Power generation plant and method for operating the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |