CN106765265A - A kind of low low temperature heat system of ultra-clean discharging fire coal unit open type - Google Patents
A kind of low low temperature heat system of ultra-clean discharging fire coal unit open type Download PDFInfo
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- CN106765265A CN106765265A CN201710007441.8A CN201710007441A CN106765265A CN 106765265 A CN106765265 A CN 106765265A CN 201710007441 A CN201710007441 A CN 201710007441A CN 106765265 A CN106765265 A CN 106765265A
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- heater
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- water
- water inlet
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- 239000003245 coal Substances 0.000 title claims abstract description 17
- 238000007599 discharging Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 136
- 239000007789 gas Substances 0.000 claims abstract description 51
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000003546 flue gas Substances 0.000 claims abstract description 44
- 239000000779 smoke Substances 0.000 claims abstract description 40
- 238000011084 recovery Methods 0.000 claims abstract description 39
- 239000002918 waste heat Substances 0.000 claims abstract description 39
- 230000003020 moisturizing effect Effects 0.000 claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
- 239000000428 dust Substances 0.000 claims description 20
- 239000012717 electrostatic precipitator Substances 0.000 claims description 12
- 239000012716 precipitator Substances 0.000 claims description 10
- 238000006477 desulfuration reaction Methods 0.000 claims description 4
- 230000008676 import Effects 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 230000023556 desulfurization Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 6
- 238000012546 transfer Methods 0.000 abstract description 3
- MXWHMTNPTTVWDM-NXOFHUPFSA-N mitoguazone Chemical compound NC(N)=N\N=C(/C)\C=N\N=C(N)N MXWHMTNPTTVWDM-NXOFHUPFSA-N 0.000 abstract 2
- 239000003570 air Substances 0.000 description 12
- 235000019504 cigarettes Nutrition 0.000 description 12
- 238000005260 corrosion Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 5
- 230000003009 desulfurizing effect Effects 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 210000004907 gland Anatomy 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001925 catabolic effect Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005367 electrostatic precipitation Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Classifications
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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
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- 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
- F22D1/36—Water and air preheating systems
-
- 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
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2217/00—Intercepting solids
- F23J2217/10—Intercepting solids by filters
- F23J2217/102—Intercepting solids by filters electrostatic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
- F23J2900/15081—Reheating of flue gases
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Water Supply & Treatment (AREA)
- Air Supply (AREA)
Abstract
The invention discloses a kind of ultra-clean low low temperature heat system of discharging fire coal unit open type, it is related to a kind of open type MGGH systems for stablizing regulation and control, the delivery port of gas cooler is respectively communicated with smoke re-heater water inlet and waste heat recovery hot water mixer's water inlet by the pipe-line system with valve, auxiliary steam heater is additionally provided with the water inlet pipeline of smoke re-heater, the delivery port of smoke re-heater connects the water inlet of gas cooler through recirculated water and moisturizing blender and frequency conversion booster with the pipe-line system with valve, the water inlet of recirculated water and moisturizing blender is also connected with condensate line, the delivery port of waste heat recovery hot water mixer is by least pipeline connection of the two-way with valve to low adding system pipeline.The present invention solves existing MGGH technologies to be had that electric cleaner inlet flue gas temperature, the regulation and control of chimney inlet flue gas temperature are difficult and plate type heat exchanger heat transfer effect is not enough, causes unit low plus the difficult disturbance of regulation control.
Description
Technical field
The present invention relates to a kind of open type MGGH systems for stablizing regulation and control, belong to the ultra-clean low low temperature exhaust heat of discharging fire coal unit
Using technical field.
Background technology
After GB 13223-2011《Fossil-fuel power plant atmospheric pollutant emission standard》And GB3095-2012《Ambient air quality mark
It is accurate》Implementation, country again promulgate《Coal electricity energy-saving and emission-reduction upgrading and transformation action plan (2014-2020)》, it is shown that government
Improvement to the disposal of pollutants of coal unit is determined, and the implementation of a series of this policy, standard is to coal unit pollutant catabolic gene
Technology proposes requirement higher.
The general inlet flue gas temperature of current China's coal-burning power plant's wet fuel gas desulfurizing technology is 120~150 DEG C, and outlet cigarette temperature is 30
~50 DEG C, to avoid desulfurization from lowering the temperature, water consume is excessive and desulfuration efficiency declines, chimney emission atmosphere hoist height deficiency causes near-earth
The chimney anticorrosion treatment series of problems of pollution (such as gypsum rain), soot emissions water smoke long queue and costliness, generally fills in desulfurization
Put smoke entrance and swinging gas-gas heat exchanger (Ro-tation Gas-Gas Heater, abbreviation RGGH) is set.But from China
From the point of view of the RGGH devices that coal-burning power plant has put into operation, majority has flue gas short circuit pollutant escapes causes SO2 discharge beyond standards, heat exchanger fin
Burn into ash deposit and slag buildup, flue gas are blocked, resistance is big, operation and maintenance expense is high etc. series of problems, even influenceed when failure is serious be
The normal operation of system.
Regarding to the issue above, both at home and abroad under the promotion that environment protection emission control composite request is improved constantly, development and application
The low low-temperature flue gas treatment technology of UTILIZATION OF VESIDUAL HEAT IN, it is proposed that can replace above-mentioned RGGH MGGH (full name be Mitsubishi Gas-
Gas Heater) technology.MGGH systems are single dedusting and the sulfur removal technology road with electric cleaner and wet fuel gas desulfurizing technology
Based on line, for developing and coming can both improve efficiency of dust collection, reduce flue gas corrosion, and can realize using the new of afterheat energy-saving
Technology.
The synthesized environmental protection process route of country's fired power generating unit is still relatively simple at present, simple dedusting and sulfur removal technology route
The requirement of following environmental protection standard development and change is can not meet, and has not reached the resultant effect of energy-saving and emission-reduction, it is existing
There are problems in MGGH systems.There is electric cleaner inlet flue gas temperature, chimney the invention is intended to solving existing MGGH technologies to enter
The regulation and control of mouthful cigarette temperature are difficult and plate type heat exchanger heat transfer effect is not enough, cause unit low plus the difficult disturbance of regulation control is asked greatly etc.
Topic.
The content of the invention
It is an object of the invention to：The synthesized environmental protection process route for solving country's fired power generating unit at present is still relatively simple, single
Pure dedusting and sulfur removal technology route can not meet the requirement of following environmental protection standard development and change, and do not reach energy-conservation and subtract
The resultant effect of row, solve existing MGGH technologies exist electric cleaner inlet flue gas temperature, the regulation and control of chimney inlet flue gas temperature it is difficult and
Plate type heat exchanger heat transfer effect is not enough, cause unit low plus adjust the problems such as controlling difficult disturbance big.
The object of the invention is realized by following technical proposals：
A kind of low low temperature heat system of ultra-clean discharging fire coal unit open type, including it is arranged in boiler tail air preheat
Gas cooler after device, and the smoke re-heater before chimney is arranged in, also including auxiliary steam heater, waste heat recovery heat
Water mixer, recirculated water and moisturizing blender and frequency conversion booster, the delivery port of gas cooler is by the pipeline with valve
System is respectively communicated with smoke re-heater water inlet and waste heat recovery hot water mixer's water inlet, the water inlet pipeline of smoke re-heater
On be additionally provided with auxiliary steam heater, the delivery port of smoke re-heater through recirculated water and moisturizing blender and frequency conversion booster and
Pipe-line system with valve connects the water inlet of gas cooler, and also by band valve on the water inlet pipeline of the gas cooler
The water inlet of the branch road of door and the water inlet pipeline connection of smoke re-heater, recirculated water and moisturizing blender is also pumped out with condensate
Mouth and the low condensate line for adding outlet of the first order are respectively communicated with, and on the water inlet pipeline of the recirculated water and moisturizing blender
Also connected with the water inlet of waste heat recovery hot water mixer by the branch road with valve, the delivery port of waste heat recovery hot water mixer
By pipeline connection of at least two-way with valve to low adding system pipeline.
Alternatively, the delivery port of waste heat recovery hot water mixer is respectively communicated to low adding by pipeline of the two-way with valve
The third level of system pipeline is low plus outlet is low with the second level plus exports.
Alternatively, gas cooler is arranged between the outlet of boiler tail air preheater and electrostatic precipitator import
In flue, smoke re-heater is arranged in the flue between wet electrical dust precipitator exhaust pass and chimney, electrostatic precipitator and wet
Desulphurization system is provided between formula electric cleaner.
Foregoing main scheme of the invention and its each further selection scheme can be this with independent assortment to form multiple schemes
Invention can be used and claimed scheme；And the present invention, between (each non conflicting selection) selection and and other selections between
Can also independent assortment.Those skilled in the art can understand have after the present invention program is understood according to prior art and common knowledge
Multiple combination, is claimed technical scheme of the invention, and exhaustion is not done herein.
The low low temperature heat system of ultra-clean discharging fire coal unit open type of this patent, using open type condensate circulation and stress
Waste heat, wherein " the ultra-clean discharging fire coal unit " refers to meet GB 13223-2011《Thermal power plant's Air Pollutant Emission mark
It is accurate》And GB3095-2012《Ambient air quality》, and《Coal electricity energy-saving and emission-reduction upgrading and transformation action plan (2014-
2020)》；" the low low temperature heat " refers to the utilization to the fume afterheat after boiler tail air preheater.
This patent directly utilizes condensate and flue gas heat exchange using arrangement heat exchanger (gas cooler and smoke re-heater),
Flue-gas temperature required for control diverse location, and suitably by flue gas waste heat recovery.Wherein, the temperature of gas cooler and suction
Heat energy power is extracted the condensate of diverse location, the mixed water journey in recirculated water and moisturizing blender by recirculated water and moisturizing blender
Degree, the control of frequency conversion booster, and gas cooler entrance pipe to smoke re-heater entrance pipe branch road point
Flow degree adjusts determination jointly；Water outlet and gas cooler of the temperature and emission capacity of smoke re-heater by gas cooler
Entrance pipe to the branch road of the entrance pipe of smoke re-heater mixed water degree, and the auxiliary heat of auxiliary steam heater common adjusts
Section determines；The return water temperature and flow for returning low adding system are extracted not by the water outlet of gas cooler with waste heat recovery hot water mixer
Determination is adjusted jointly with the mixed water degree of the condensate of position, and the backwater has the backwater point of some low adding systems of matching, to the greatest extent
Amount is reduced to be disturbed low adding system.
This patent arranges that flue gas is cold in the flue between the outlet of boiler tail air preheater and electrostatic precipitator import
But device, will enter the flue-gas temperature of electrostatic precipitator by dropping to 90 DEG C, and then reduce exhaust gas dust ratio resistance, play electrostatic precipitation
The low temperature dustproof function of device, greatly improves efficiency of dust collection.
This patent arranges smoke re-heater in the flue between wet electrical dust precipitator exhaust pass and chimney, heat wet type
The flue gas of electric cleaner outlet, is lifted into the flue-gas temperature of chimney, and flue-gas temperature enters back into chimney, can subtract significantly after raising
Slow corrosion of the flue gas to chimney, " white cigarette " phenomenon for the discharge that removes smoke.
This patent returns cloth on the pipeline (gas cooler delivery port to low adding system) of low adding system in waste heat recovery hot water
Waste heat recovery hot water mixer is put, the hot water temperature of waste heat recovery hot water mixer is adjusted using condensate, it is ensured that waste heat is returned
Receive hot water and return low adding system temperature requirement.When summer and high load capacity operating mode, air preheater outlet exhaust gas temperature is higher, to make flue gas
Cooler outlet temperature is down to 90 DEG C, and the recirculated water caloric receptivity of gas cooler is more than smoke re-heater recirculated water thermal discharge, many
Remaining heat is by the Recovery of the hot water after waste heat recovery hot water mixer's temperature adjustment to the low adding system of unit, so as to squeeze low plus take out
Vapour, reduces coal consumption, improves the economic benefit of unit.
This patent arranges recirculated water and moisturizing on the pipeline between smoke re-heater circulating water outlet and frequency conversion booster
Blender, moisturizing water source is quoted from condensate (such as condensate pump outlet and the first order before condensate system gland heater
Low plus outlet), recirculated water and moisturizing blender play a part of expansion tank and water replanishing device simultaneously, it is ensured that the open system water
Amount balance.
This patent arranges frequency conversion booster on the pipeline between recirculated water and moisturizing blender and gas cooler.One side
Face, frequency conversion booster provides powerful guarantee for system water circulation；On the other hand, the electricity that frequency conversion booster passes through Frequency Converter Control pump
Unit frequency enters the circulating water flow of gas cooler to adjust, so as to efficiently control the exiting flue gas temperature of gas cooler
Degree.
This patent sets at least low adding system pipeline of two-way waste heat recovery hot water time, and (such as third level is low plus exports and second
Level is low plus exports), low adding system route is returned according to season and unit load situation selection waste heat recovery hot water, reduce the system pair
The influence of the low adding system of unit.
This patent uses direct contact type hybrid mode (recirculated water and moisturizing blender and waste heat recovery hot water mixer),
The temperature of gas cooler entrance recirculated water and waste heat recovery hot water is effectively controlled, control method is simple and direct, efficient.
Beneficial effects of the present invention：
1. carry out open circulation by extracting small amount of condensate (account for condense water inventory 5%), through with air preheat
Flue gas carries out heat exchange before device exiting flue gas and chimney entrance, and the fume afterheat of recovery is recycled into the low water-adding system of unit, keeps away
Exempt from smoke condensation, prevent flue gas low-temperature from corroding.Meanwhile, by waste heat recovery hot water mixer and recirculated water and moisturizing blender reality
Existing gas cooler inlet water temperature and waste heat recovery hot water temperature, flow are automatically controlled, it is ensured that in various operating mode electric cleaners
Input gas temperature and enter automatically controlling for chimney smoke temperature.
2. in high load capacity, condensing water temperature highest can be improved about 5 DEG C by the heat reclaimed by the residual neat recovering system,
Realize UTILIZATION OF VESIDUAL HEAT IN and energy-saving and emission-reduction.
3. gas cooler reduces the inlet flue gas temperature of deduster, while because under actual flue gas volume caused by cigarette temperature declines
Drop.The ratio resistance reduction of dust, the efficiency of dust collection of electric cleaner is improved；
4. flue-gas temperature reduction, it is possible to reduce the water consume of desulfurizing tower, while high-temperature flue gas can be weakened to desulfurizing tower anti-corrosion
The destruction of material；Because dust concentration is of a relatively high before deduster, the condensation acid solution of SO2 is easily wrapped up by dust, substantially will not be under
Trip equipment causes corrosion phenomenon.
5. secondly, smoke re-heater improves chimney emission temperature, on the one hand can slow down the corrosiveness of flue and chimney,
On the other hand, the raising of cigarette temperature can solve " white cigarette " phenomenon of chimney, eliminate misunderstanding of the resident to smoke evacuation nearby；
6. simultaneously, the rising of cigarette temperature can strengthen the dust and liquid that pull up power, prevent saturated flue gas carrying of chimney itself
Drop is gathered in and falls earthward to form " gypsum rain " phenomenon near chimney, it is to avoid the environment of power plant and surrounding area is produced pollution or
The corrosion of person's electric power factory equipment.
Brief description of the drawings
Fig. 1 is the device schematic flow sheet of the embodiment of the present invention；
Wherein gas cooler 101, smoke re-heater 105, auxiliary steam heater 106, waste heat recovery hot water mixer
108th, recirculated water and moisturizing blender 109, frequency conversion booster 110, electrostatic precipitator 102, desulphurization system 103, wet-esp
Device 104, condenser 111, the condensate pump 112, first order be low Jia 114, the second level it is low Jia 115, the third level it is low Jia 116, boiler it is empty
Air preheater 113, chimney 107.
Specific embodiment
Following non-limiting examples are used to illustrate the present invention.
With reference to shown in Fig. 1, the ultra-clean low low temperature heat system of discharging fire coal unit open type, including gas cooler
101st, smoke re-heater 105, auxiliary steam heater 106, waste heat recovery hot water mixer 108, recirculated water and moisturizing blender
109th, frequency conversion booster 110 and the pipe-line system of system connection, valve and control system, and it is related to the electrostatic precipitator of unit
102nd, desulphurization system 103, wet electrical dust precipitator 104, condenser 111, the condensate pump 112, first order it is low Jia 114, the second level it is low
Plus 115, the third level it is low Jia 116, boiler air preheater 113, chimney 107 etc..
Gas cooler 101 is arranged in boiler tail air preheater 113 and exports and the import of electrostatic precipitator 102 between
In flue, the flue-gas temperature into electrostatic precipitator 102 drops to 90 DEG C by 120 DEG C~150 DEG C, into gas cooler 101
Condensing water temperature bring up to 105 DEG C by 70 DEG C, and then reduce exhaust gas dust ratio resistance, play the low temperature of electrostatic precipitator 102
Dustproof function, greatly improves efficiency of dust collection, while reducing desulfurizing tower water consume；
Smoke re-heater 105 is arranged in the flue between the exhaust pass of wet electrical dust precipitator 104 and chimney, flue gas cooling
Part hot water after device 101 is heated goes to heat the flue gas of the outlet of wet electrical dust precipitator 104, and flue-gas temperature rises to 80 DEG C by 45 DEG C
Enter chimney, water temperature is down to 73 DEG C by 105 DEG C.Flue-gas temperature enters back into chimney after being increased to 80 DEG C, can reducing smoke pair significantly
The corrosion of chimney, " white cigarette " phenomenon for the discharge that removes smoke.
Auxiliary steam heater 106 is arranged on the circulating water line before smoke re-heater 105.Running on the lower load and winter
During season operating mode operation, because the outlet of boiler air preheater 113 cigarette temperature is relatively low, the outlet cigarette of gas cooler 101 temperature drop is extremely
90 DEG C of shortages of heat for being absorbed are so that the exit gas temperature of wet electrical dust precipitator 104 is increased to 80 DEG C by 45 DEG C.Now, steam
Heater 106 need to put into operation, heat cycles hot water to certain temperature, there is provided the exit gas temperature of wet electrical dust precipitator 104
80 DEG C of heats being short of are risen to by 45 DEG C.
Waste heat recovery hot water mixer 108 is arranged in waste heat recovery hot water and returns on the pipeline of low adding system, using condensate
Regulation hot water temperature, it is ensured that waste heat recovery hot water returns low adding system temperature requirement.When summer and high load capacity operating mode, boiler tail
The outlet exhaust gas temperature of air preheater 113 is higher, to make the outlet temperature of gas cooler 101 be down to 90 DEG C, gas cooler 101
Recirculated water caloric receptivity be more than the recirculated water thermal discharge of smoke re-heater 105, unnecessary heat passes through waste heat recovery hot water mixer
Recovery of the hot water after 108 temperature adjustments is to the low adding system of unit, so as to squeeze low plus draw gas, reduces coal consumption, improves the economic effect of unit
Benefit.
Recirculated water and moisturizing blender 109 are arranged between the circulating water outlet of smoke re-heater 105 and frequency conversion booster 110
Pipeline on, quoted from the condensate before condensate system gland heater, recirculated water and moisturizing blender 109 are simultaneously at moisturizing water source
Play a part of expansion tank and water replanishing device, it is ensured that the open system water balance.
Frequency conversion booster 110 is arranged on the pipeline between recirculated water and moisturizing blender 109 and gas cooler 101.
On the one hand, frequency conversion booster 110 provides powerful guarantee for system water circulation；On the other hand, frequency conversion booster 110 passes through frequency converter
The electric machine frequency of controlling pump enters the circulating water flow of gas cooler to adjust, so as to efficiently control going out for gas cooler
Mouth flue-gas temperature.
In high load capacity and summer condition, about 70 DEG C of recirculated water is delivered to flue gas and is cooled down through frequency conversion booster 110 after temperature adjustment
Device 101 and flue gas heat exchange, the temperature that recirculated water goes out gas cooler 101 reach 105 DEG C, and most circulating hot waters are delivering to cigarette
Gas reheater 105 heats flue gas.105 DEG C of unnecessary hot water can directly send back to that the third level is low Jia 116 as waste heat recovery carrier
Outlet, the two water temperature just matches, and can also send that the second level is low Jia 115 and export back to after temperature adjustment.The low low temperature heat of the open type
System directly passes through condensate moisturizing.
During underload, without waste heat recovery, increase auxiliary steam and be supplemented in the system as auxiliary thermal source, moisturizing takes from first
Level it is low Jia 114 outlet, maintain the system and low adding system low discharge circulation water coke slurry, when being prevented effectively from long-time underrun
Influence of the closed cycle to water quality.
Difference is adjusted by controlling the circulating water flow of gas cooler 101, smoke re-heater 105 and bypath system
Two heat exchange amounts of flue gas heat-exchange unit during load, the corresponding outlet cigarette temperature of control meets system operation requirement.
By taking a unit of 300MW as an example, the 100%ECR components of system as directed parameters are as follows：
Go out boiler tail air preheater 113 and drop to 90 DEG C by 140 DEG C into the flue-gas temperature of electrostatic precipitator 102,
By 70 DEG C, 520t/h brings up to 105 DEG C, 520t/h to condensing water temperature into gas cooler.After gas cooler 101 is heated
Part hot water 479.7t/h go smoke re-heater 105 heat wet electrical dust precipitator 104 outlet flue gas, flue-gas temperature is by 45 DEG C
Rise to 80 DEG C and enter chimney, water temperature is down to 73 DEG C by 105 DEG C, unnecessary 105 DEG C of hot water 40.3t/h to waste heat recovery hot water mix
Device 108.
Recirculated water and moisturizing blender 109 are arranged on the pipeline between smoke re-heater circulating water outlet and booster,
Moisturizing water source quoted from before condensate system gland heater to the first order is low Jia 114 between 34 DEG C of condensate.Waste heat recovery
When hot water mixer 108 needs temperature adjustment, moisture two-way is condensed, 40.3t/h is another to recirculated water and moisturizing blender 109 all the way
Road 16.8t/h carries out temperature adjustment to waste heat recovery hot water mixer 108.
About 70 DEG C of recirculated water is delivered to flue gas and is cooled down through frequency conversion booster 110 after recirculated water and the temperature adjustment of moisturizing blender 109
Device 101 and flue gas heat exchange.
It is low that 105 DEG C of hot water of waste heat recovery hot water mixer 108 can directly send back to the third level as waste heat recovery carrier
Plus 116 and export, the two water temperature is just matched, and also can send second after 57.1t/h back to through 84.1 DEG C of the condensate temperature adjustment of 16.8t/h
Level it is low Jia 115 export.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (3)
1. a kind of low low temperature heat system of ultra-clean discharging fire coal unit open type, including it is arranged in boiler tail air preheater
Gas cooler afterwards, and it is arranged in the smoke re-heater before chimney, it is characterised in that：Also include auxiliary steam heater,
Waste heat recovery hot water mixer, recirculated water and moisturizing blender and frequency conversion booster, the delivery port of gas cooler pass through band
The pipe-line system of valve is respectively communicated with smoke re-heater water inlet and waste heat recovery hot water mixer's water inlet, smoke re-heater
Auxiliary steam heater is additionally provided with water inlet pipeline, the delivery port of smoke re-heater is through recirculated water and moisturizing blender and change
Frequency booster is connected on the water inlet of gas cooler, and the water inlet pipeline of the gas cooler with the pipe-line system with valve
Also by the water inlet pipeline connection of the branch road with valve and smoke re-heater, the water inlet of recirculated water and moisturizing blender also with
Condensate pump is exported and the first order is low plus condensate line of outlet is respectively communicated with, and the recirculated water and moisturizing blender enter
Also connected with the water inlet of waste heat recovery hot water mixer by the branch road with valve on the pipeline of the mouth of a river, the mixing of waste heat recovery hot water
The delivery port of device is by least pipeline connection of the two-way with valve to low adding system pipeline.
2. the ultra-clean low low temperature heat system of discharging fire coal unit open type as claimed in claim 1, it is characterised in that：Waste heat
The delivery port for reclaiming hot water mixer adds by the way that the third level that pipeline of the two-way with valve is respectively communicated to low adding system pipeline is low
Outlet and the second level are low plus export.
3. the ultra-clean low low temperature heat system of discharging fire coal unit open type as claimed in claim 1, it is characterised in that：Flue gas
Cooler is arranged in the flue between the outlet of boiler tail air preheater and electrostatic precipitator import, smoke re-heater arrangement
In flue between wet electrical dust precipitator exhaust pass and chimney, desulfurization is provided between electrostatic precipitator and wet electrical dust precipitator
System.
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| CN107166417A (en) * | 2017-07-10 | 2017-09-15 | 都江电力设备厂 | A kind of new MGGH systems minimum wall temperature control method and system |
| CN107218618A (en) * | 2017-06-02 | 2017-09-29 | 浙江巨化热电有限公司 | A kind of smoke waste heat comprehensive utilization system and its method |
| CN108386863A (en) * | 2018-04-09 | 2018-08-10 | 无锡华光新动力环保科技股份有限公司 | Power plant takes off bletilla residual neat recovering system |
| CN110440234A (en) * | 2019-08-27 | 2019-11-12 | 东方电气集团东方锅炉股份有限公司 | A kind of machine furnace tow taste heat comprehensive utilization adjustment system and its control method |
| CN110486711A (en) * | 2019-09-26 | 2019-11-22 | 西安西热锅炉环保工程有限公司 | A kind of low low-level (stack-gas) economizer system for sulphur coal unit |
| CN110631040A (en) * | 2019-10-18 | 2019-12-31 | 河北冀研能源科学技术研究院有限公司 | High-efficiency energy-saving smoke condensing and reheating white smoke eliminating system |
| CN111911947A (en) * | 2020-08-21 | 2020-11-10 | 邯郸学院 | Flue gas dehumidification system |
| CN113432143A (en) * | 2021-07-06 | 2021-09-24 | 胜利国电(东营)热电有限公司 | Low-temperature flue gas waste heat recovery system |
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| CN110440234A (en) * | 2019-08-27 | 2019-11-12 | 东方电气集团东方锅炉股份有限公司 | A kind of machine furnace tow taste heat comprehensive utilization adjustment system and its control method |
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| CN110486711A (en) * | 2019-09-26 | 2019-11-22 | 西安西热锅炉环保工程有限公司 | A kind of low low-level (stack-gas) economizer system for sulphur coal unit |
| CN110631040A (en) * | 2019-10-18 | 2019-12-31 | 河北冀研能源科学技术研究院有限公司 | High-efficiency energy-saving smoke condensing and reheating white smoke eliminating system |
| CN111911947A (en) * | 2020-08-21 | 2020-11-10 | 邯郸学院 | Flue gas dehumidification system |
| CN113432143A (en) * | 2021-07-06 | 2021-09-24 | 胜利国电(东营)热电有限公司 | Low-temperature flue gas waste heat recovery system |
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Application publication date: 20170531 |