CN107300188B - A kind of smoke comprehensive energy-saving and emission-reduction system for taking into account low-temperature corrosion and UTILIZATION OF VESIDUAL HEAT IN - Google Patents
A kind of smoke comprehensive energy-saving and emission-reduction system for taking into account low-temperature corrosion and UTILIZATION OF VESIDUAL HEAT IN Download PDFInfo
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- CN107300188B CN107300188B CN201710127994.7A CN201710127994A CN107300188B CN 107300188 B CN107300188 B CN 107300188B CN 201710127994 A CN201710127994 A CN 201710127994A CN 107300188 B CN107300188 B CN 107300188B
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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
- 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
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- Chimneys And Flues (AREA)
Abstract
The present invention provides a kind of smoke comprehensive energy-saving and emission-reduction systems for taking into account low-temperature corrosion and UTILIZATION OF VESIDUAL HEAT IN, in flue, flue gas sequentially enters air preheater and deduster via SCR catalyst layer, nozzle system is equipped in horizontal flue before SCR catalyst layer, nozzle system is connected with sodium carbonate liquor feed system；It is connected between on rear side of SCR catalyst layer and on front side of deduster by bypass flue, heat exchanger is equipped in bypass flue, after flue gas goes out SCR catalyst layer, most of flue gas enters air preheater via flue collector, remaining fraction flue gas enters bypass flue and cools down via heat exchanger, and deduster is entered after the flue gas of bypass flue is mixed with the flue gas of air preheater out out；Low-level (stack-gas) economizer is equipped in flue after deduster, low-level (stack-gas) economizer is connected with preposition steam air heater.This system can reduce heated surface at the end of boiler fouling blockage and low-temperature corrosion phenomenon, improve the utilization efficiency of fume afterheat, realize smoke comprehensive energy-saving and emission-reduction integration.
Description
Technical field
The present invention relates to a kind of synthetic energy-saving discharge-reducing systems for boiler tail smoke evacuation, for (special to coal unit
It is sulphur coal) boiler smoke progress SO3Removing to reduce acid dew point, and cascade utilization is carried out to fume afterheat and heats height respectively
Water supply, low pressure feed water and cold wind are pressed, so that fume afterheat utilization rate is improved under the premise of avoiding back-end surfaces low-temperature corrosion,
Belong to boiler technology field.
Background technique
In coal unit, with the reduction of flue-gas temperature, SO3It is gaseous state SO in furnace outlet3, exported in SCR catalyst
Be changed into gaseous sulfuric acid, into wet desulphurization device after be further transformed to sulfuric acid aerosol, acidity gradually enhances, to equipment
Corrosion also gradually enhances.Influence to unit includes: one, improves acid dew-point temperature, to limit smoke temperature drop, is influenced remaining
Recuperation of heat effect；Two, make SCR and air preheater ash deposit and slag buildup；Three, " Lan Yu " phenomenon is generated.
Currently, the denitrating system of domestic coal unit generallys use SCR technology (selective catalytic reduction), with NH3(urine
Element) it is reducing agent, it, will within the scope of the flue-gas temperature between 320 DEG C to 420 DEG C using vanadium-tungsten-titanium series metal as catalyst
NOxIt is converted into N2.On the one hand, catalyst can be by SO2Catalysis oxidation is SO3, conversion ratio is depending on V2O5Content, catalyst wall thickness,
Catalyst form and flue-gas temperature etc., V in catalyst2O5Loading it is bigger, SO3Transformation efficiency it is also higher.In SCR system
SO3Conversion ratio is about 0.5%~1.5%.On the other hand, reducing agent NH used3Meeting and SO3It reacts, increases ammonia spraying amount and mention
While its high O&M cost, ammonium sulfate, the ammonium hydrogen sulfate (ABS) of generation are deposited in catalyst and air preheater metal surface, are made
Catalyst activity, which reduces, influences NOxRemoval efficiency increases air preheater fouling blockage by blower power consumption, forces unit blowing out deashing.
Country does not put into effect for SO also3The relevant criterion of discharge, existing main SO3Removing sulfuldioxide is to remove for flue gas
SO2Electrostatic precipitation (ESP) and wet desulphurization (FGD) with dust.In ESP, the sulfuric acid of condensation will be quiet together with flying dust
Electric precipitator removing, SO3Removal efficiency depend on flue-gas temperature and flyash ingredient, usual SO3Removal efficiency be about 10%~
15%.In FGD, residence time of the flue gas in absorption tower is shorter, while sulfuric acid vapor is condensed into very carefully in absorption tower
Sulfuric acid aerosol, it is difficult to absorbed by lime slurry, SO3Removal efficiency be usually 30%~40%.SO3Removal efficiency is universal
It is relatively low, and SO in flue gas3Content is larger to cause acid dew point excessively high, the smoke temperature drop after limiting air preheater, and the waste heat of tail portion returns
Receiving unit is usually low-level (stack-gas) economizer to heat low pressure feed water, to reduce #6 and #7 steam extraction.On the one hand, the steam extraction quality of reduction compared with
Low, energy-saving effect is poor；On the other hand, heat exchanger materials need to select corrosion resistant ND steel, and need to keep under strict control flue gas and metallic walls
Temperature is with anti-low-temperature corrosion phenomenon.
Summary of the invention
The technical problem to be solved by the present invention is to how reduce heated surface at the end of boiler fouling blockage and low-temperature corrosion phenomenon,
The utilization efficiency of fume afterheat is improved, realizes smoke comprehensive energy-saving and emission-reduction integration.
In order to solve the above-mentioned technical problem, the technical solution of the present invention is to provide one kind to take into account low-temperature corrosion and UTILIZATION OF VESIDUAL HEAT IN
Smoke comprehensive energy-saving and emission-reduction system, SCR catalyst layer, air preheater and deduster, flue gas warp are disposed in flue
Air preheater and deduster are sequentially entered by SCR catalyst layer, it is characterised in that: the horizontal cigarette before the SCR catalyst layer
Nozzle system is equipped in road, nozzle system is connected with sodium carbonate liquor feed system；
It is connected between on rear side of the SCR catalyst layer and on front side of the deduster by bypass flue, is set in bypass flue
After having heat exchanger, flue gas to go out SCR catalyst layer, most of flue gas enters air preheater, remaining fraction via flue collector
Flue gas enters bypass flue and cools down via heat exchanger, and the flue gas of bypass flue enters after mixing with the flue gas of air preheater out out
Deduster；
Low-level (stack-gas) economizer is equipped in flue after the deduster, low-level (stack-gas) economizer is by pipeline and for one, two
The preposition steam air heater that secondary wind is preheated is connected, and recirculated cooling water is connected in pipeline, recirculated cooling water is inhaled in low-level (stack-gas) economizer
Heat, the then heat release in preposition steam air heater.
Preferably, the nozzle system is distributed on the pipeline section of horizontal flue, and is inversely arranged with flue gas flow direction.
Preferably, the sodium carbonate liquor particle fog-like that the nozzle system sprays, and it is full of the pipe of entire horizontal flue
Road section.
Preferably, the sodium carbonate liquor feed system includes sodium carbonate liquor preparation and storage system, SO3Concentration monitor
System and PID control metered dispensing unit, SO3Density monitoring system is set to the entrance of the air preheater, PID control meter
Amount distributor obtains SO in real time3After the measuring signal that density monitoring system provides, separate chemical agent is passed through according to measuring signal
Flow control and Field pressure control valve carry out independent control and are transported to the nozzle by sodium carbonate liquor preparation and storage system
The injection rate of sodium carbonate liquor in each nozzle in system.
Preferably, the sodium carbonate liquor concentration is according to SO in flue gas3Concentration is configured, the sodium carbonate liquor concentration
Between 30%~50%, each nozzle of the sodium carbonate liquor droplet particles in the nozzle system goes out mass concentration
Mouth speed is 60~80m/s, sodium carbonate and SO in the sodium carbonate liquor3Molar ratio is set as 1.5: 1~4: 1, and sodium carbonate is molten
The size droplet diameter of liquid is less than 50um.
Preferably, it is equipped with two-stage heat exchanger in the bypass flue, including is sequentially arranged in bypass flue along flue gas flow direction
Interior high-pressure feed water heat exchanger and low pressure feed water heat exchanger is given respectively from master in high-pressure feed water heat exchanger and low pressure feed water heat exchanger
Waterpipe draws high-pressure feed water and low pressure feed water, and high-pressure feed water and low pressure feed water return to respective backheat heating respectively after being heated
The main feed water pipe road of device outlet, mixes with main water supply.
Preferably, the high-pressure feed water heat exchanger and low pressure feed water heat exchanger are in parallel with respective bleeder heater.
Preferably, the bleeder heater is given with the corresponding high-pressure feed water heat exchanger or the low pressure feed water heat exchanger
The proportion of water flow is 0%~40%.
Preferably, into the 10%~30% of the total exhaust gas volumn of exhaust gas volumn Zhan of the bypass flue.
The smoke comprehensive energy-saving and emission-reduction system specific workflow provided by the invention for taking into account low-temperature corrosion and UTILIZATION OF VESIDUAL HEAT IN
It is as follows:
Sodium carbonate liquor in nozzle with misty liquid droplets after being entered in flue, after inverse flue gas flow direction flows a distance
It is uniformly mixed with flue gas, moisture is evaporated by flue gas rapid draing, the SO that excessive powdered sodium carbonate particle is generated with burner hearth first3
It is neutralized, generates SO with catalyst again after SCR3It is neutralized, makes the SO in flue gas3Content is greatly reduced, flue gas
Acid dew-point temperature is down near water dew point, so that flue gas be made to have biggish cooling space and waste heat recycling potentiality.It is basic herein
On, partial removal SO3And NOxFlue gas without air preheater, two-step heating is successively heated by heat exchanger in bypass flue
The high and low pressure water supply of device, the flue gas after cooling are mixed with the flue gas that air preheater exports, uniformly rear to enter deduster.And high and low pressure
Water supply returns to main feed water pipe road after being heated in respective heat exchanger mixes with the main water supply that bleeder heater exports, into heating
The main feedwater flow of device is reduced, and the steam extraction amount of respective heater also decreases to reach energy-efficient purpose.Cigarette in air preheater
The reduction of tolerance can cause the decline of first and second wind-warm syndrome to reduce boiler efficiency, therefore be absorbed using low-level (stack-gas) economizer by removing
The waste heat of flue gas after dirt device, and preheating in preposition steam air heater to primary and secondary air prevents in air preheater cold end to block same
When, outlet wind-warm syndrome is improved, outlet smoke temperature is further decreased, from the cascade utilization for realizing waste heat.
System provided by the invention before SCR catalyst layer by spraying into sodium carbonate liquor, to absorb the SO in flue gas3,
To which acid dew-point temperature be greatly reduced, back-end surfaces fouling blockage and low-temperature corrosion phenomenon are reduced；Air preheater is optimized
After transformation (using the heat exchange element of the high coefficient of heat transfer, or increasing the number of plies of air preheater to improve heat exchange area), in SCR
Flue gas is arranged after catalyst layer and is bypassed, heats high and low pressure water supply respectively in bypass flue；In the flue after deduster
Arrange that low-level (stack-gas) economizer, cooling water therein preheat primary and secondary air by preposition steam air heater, effective use fume afterheat heating is high
Water supply, low pressure feed water and cold wind are pressed, to meet the requirement that fume afterheat efficiently utilizes, realizes smoke comprehensive energy-saving and emission-reduction one
Change.
This system can remove SO in flue gas385% or more, reduce by 20~40 DEG C of acid dew point；Catalyst, air preheater region without
Ammonium hydrogen sulfate fouling；SCR activity temperature is reduced to 268 DEG C, realizes that underload throws denitration；Waste heat carries out efficient cascade utilization, point
High-pressure feed water, low pressure feed water and cold wind Yong Yu not be heated, coal consumption is further decreased；Low-temperature corrosion is not present in back-end ductwork and equipment
And blocking, operational efficiency and safety are higher.
Compared with prior art, the invention has the following beneficial effects:
1, system is simple and efficient, and ejecta replaces powder particle with solution, has the better uniformity and reactivity,
SO3Removal efficiency can be to 85% or more, and can cooperation-removal HCl, HF, H2SeO3Equal acidic materials.Be conducive to flying dust to Hg simultaneously
Capture, play comprehensive emission reduction effect.
2, spraying system is placed in front of spray ammonia system, the SO in flue gas3It is reacted first with sodium carbonate, to reduce denitration
Throwing ammonia amount used reduces the operation expense for throwing denitrating system.
3, spraying system is placed in front of SCR denitration layer, flue gas middle acid substance (especially SO3) removing can be effectively reduced
The minimum activationary temperature of catalytic component based on vanadium is reduced to 268 DEG C by 315 DEG C generally acknowledged, is conducive to underload and throws denitration.With it is traditional
The technologies such as the wide load denitration such as classification of hot water re-circulation, economizer, gas bypass are compared, and improvement expenses are low and to boiler efficiency shadow
Sound is small, can fundamentally solve the problems, such as that SCR denitration compels to move back under underload.In addition, without inactivation, abrasion or blocking in catalyst layer
Problem, SCR denitration is high-efficient, long service life.
4, without NH in air preheater4HSO4(ABS) fouling blockage, blower is low in energy consumption, good effect of heat exchange.Acid dew-point temperature
It is reduced near water dew point (40 DEG C) by 100 DEG C or more, low-temperature corrosion and blocking, operation is not present in flue gas back-end ductwork and equipment
Efficiency and safety are higher.It, can be using traditional, the better carbon steel or stainless steel of heat exchange property as heat exchange plane materiel in Late reformation
Material, improvement expenses are lower, and waste heat recovery efficiency is higher.
5, after acid dew-point temperature is greatly reduced, flue gas has biggish temperature drop space and preferable heat transfer effect, can be effective
Using fume afterheat stepped heating high-pressure feed water, low pressure feed water and cold wind, meet the requirement that fume afterheat efficiently utilizes, realizes energy
The cascade utilization in source.
Detailed description of the invention
Fig. 1 is the smoke comprehensive energy-saving and emission-reduction system schematic for taking into account low-temperature corrosion and UTILIZATION OF VESIDUAL HEAT IN；
Fig. 2 is sodium carbonate liquor feed system structural schematic diagram；
Fig. 3 is that double-bank heater is illustrated for heating high-low pressure water supply with reducing the operation of regenerative steam in gas bypass
Figure.
Specific embodiment
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention
Rather than it limits the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, those skilled in the art
Member can make various changes or modifications the present invention, and such equivalent forms equally fall within the application the appended claims and limited
Range.
Using certain power plant 660MW ultra supercritical wet type cooling unit as object, due to burning high sulfur coal, temperature of discharging fume under THA operating condition
Up to 130 DEG C of degree, fume side pressure difference is greater than 3kPa, and conversion sulphur content is counted up to 0.74% according to the 2% of the total sulphur content of SO3 Zhan in flue gas,
Acid dew-point temperature is also up to 140 DEG C or more.For high fume temperature brought by its burning high sulfur coal, air preheater resistance is big and flue
The problems such as back-end surfaces low-temperature corrosion, present embodiments provides a kind of smoke comprehensive section for taking into account low-temperature corrosion and UTILIZATION OF VESIDUAL HEAT IN
Energy emission-reducing system, as shown in Figure 1, the effect different according to system, can be divided into sodium carbonate liquor feed system (Fig. 2), high temperature cigarette
Gas bypath system (Fig. 3) and low-temperature flue gas warm air system.
In sodium carbonate liquor feed system, dry solid granular sodium carbonate uses hopper truck 8 with ton packet form
It is delivered between storing up and stores, it is contemplated that need the storage for having seven days between safety storage.Belt pulley 9 and bucket elevator lead to powdered sodium carbonate
Cross hopper 10 and dissolving tank 11 be configured to 50% solution, solution reservoir 13 is transported to by feed pump 12 and stands storage, is considered
To safety, solution reservoir 13 need to have 3 days storages.At this point, the SO arranged according to 3 import of air preheater3Concentration monitor
Shown by system herein (including burner hearth generate SO3 and SCR catalyst layer generate) SO3Concentration passes through PID control metering point
With device, by the cooperation of regulating valve and instrument (densitometer, flowmeter etc.), the accurate solution for adjusting 3t/h is by solution reservoir 13
It is transported in the main pipe being connected with the nozzle of nozzle system 2.Also sodium carbonate liquor is avoided to freeze using heat tracing and heat preservation simultaneously
Or crystallization.Solution in main pipe uniformly enters each atomizer of nozzle system 2, and atomizer is by solution with the grain of 30um
The reverse injection flue of jet velocity of diameter, 80m/s, is uniformly mixed with flue gas.Moisture in solution rapid evaporation after the implantation, shape
At the smaller solid particle of partial size, higher reaction specific surface area makes it have faster reaction efficiency, generation in titanium dioxide
Carbon gas ruptures particle expansion, caused by " puffed rice " effect further increase reactivity and rate, to SO in flue3
It gradually adsorbs, it is made to be reduced to 3~5ppm, the product sodium sulphate of removal efficiency height to 90%, generation passes through deduster 6 and flying dust one
It is same to go out.
SO3After removing, flue gas acid dew point temperature is reduced to 50 DEG C or so by 140 DEG C, therefore tail flue gas is with biggish
Space cool down so as to obtain preferable energy-saving benefit.By the way that high-temperature flue gas bypath system is arranged, by after SCR catalyst layer 1 350
DEG C high-temperature flue gas, shunt 20% enter bypass flue 4 in, remaining flue gas enters flue collector 5.The successive cloth in bypass flue 4
Two-stage heat exchanger is set, for heating high and low pressure water supply respectively, as shown in Figure 3.After high-pressure feed water heat exchanger 7-1,350 DEG C
Flue gas cool-down to 200 DEG C, after low pressure feed water heat exchanger 7-2, flue gas is further cooled to 105 DEG C.Two-stage high and low pressure is given
Water- to-water heat exchanger is respectively used to heating #3 high and adds to water and #6 high adds to water, goes out respectively with corresponding bleeder heater after heating
The main water supply mixing of mouth.From the point of view of feedwater piping, the bleeder heater mode in parallel with the heat exchanger in flue gas is formed, to reduce
30% #3 high adds to water and #6 high adds to water steam extraction, in general reduces coal consumption 5g/kWh.
And 80% flue gas enters air preheater 3 via flue collector 5, to prevent furnace effect from reducing, should ensure that the two of 320 DEG C
Secondary wind inlet wind-warm syndrome need to strengthen cigarette in air preheater 3-wind heat exchange.Therefore, effect need to be proposed to air preheater 3, and it is pre- to increase air
The layer of hot device 3 is high and replaces its heat exchange element, while enhanced heat exchange guarantees secondary air temperature, flue gas exit temperature is made to be down to 85
℃.The exiting flue gas of air preheater 3 is mixed with the exiting flue gas of bypass flue 4 to 90 DEG C or so, into electrostatic precipitator.
For the flue gas after deduster 6, low-temperature flue gas warm air system is set, and cloth is set low in the flue after deduster 6
Warm economizer, the recirculated cooling water in pipeline absorb fume afterheat, 90 DEG C of flue gas are made further to be cooled to 70 DEG C or so.Heat absorption
Recirculated cooling water after heating preheats cold primary and secondary air in preposition steam air heater, it is made to be warming up to 40 DEG C by 20 DEG C, and cooling water
It moves in circles.
In general, after unit uses this system, SO3Concentration is reduced to 3ppm, and can cooperation-removal HCl, HF, H2SeO3
Equal acidic materials are conducive to capture of the flying dust to Hg, and smoke temperature reduces and sodium salt investment causes the reduction of flying dust resistivity to improve
The dust removal efficiency of deduster plays comprehensive emission reduction effect；Acid dew point is greatly reduced to water dew point, can effectively avoid low temperature rotten
Erosion, back-end surfaces can be selected that heat exchange property is more preferable, stainless steel of cheaper, at the same substantially reduce the O&M in later period at
This；So that the minimum activationary temperature of SCR is reduced to 286 DEG C by 315 DEG C, is conducive to underload and throws denitration, and alleviate in catalyst layer
Inactivation, abrasion and blockage problem, improve denitration efficiency 5%, while can reduce generate ABS caused by ammonia be lost, reduce spray ammonia at
This；The raising of cold wind temperature, SO3Removing and air preheater upgrading, substantially avoided the black dirt in air preheater and stockpile and ABS
Blocking improves heat transfer effect while reducing blower power consumption, saves a large amount of cost of investment and equipment replacement maintenance cost；It is de-
Sulphur tower import smoke temperature reduces by 20 DEG C, greatly reduces desulfurizing tower rate of water make-up；The cooling space of 30~40 DEG C of flue gases is increased, effectively
Using fume afterheat stepped heating high-pressure feed water, low pressure feed water and cold wind, meet the requirement that fume afterheat efficiently utilizes, realizes energy
The cascade utilization in source.To which this system can obtain the comprehensive benefit of energy conservation, emission reduction and water-saving, can reduce coal consumption 5.5g/kWh.
Claims (7)
1. a kind of smoke comprehensive energy-saving and emission-reduction system for taking into account low-temperature corrosion and UTILIZATION OF VESIDUAL HEAT IN, SCR is disposed in flue and is urged
Agent layer (1), air preheater (3) and deduster (6), flue gas sequentially enter air preheater via SCR catalyst layer (1)
(3) and deduster (6), it is characterised in that: be equipped with nozzle system (2) in the horizontal flue before the SCR catalyst layer (1), spray
Mouth system (2) is connected with sodium carbonate liquor feed system；
It is connect between the deduster (6) front side by bypass flue (4) on rear side of the SCR catalyst layer (1), bypass flue
(4) heat exchanger is equipped in, after flue gas goes out SCR catalyst layer (1), most of flue gas enters air preheater via flue collector (5)
(3), remaining fraction flue gas enters bypass flue (4) and cools down via heat exchanger, out the flue gas of bypass flue (4) and air out
Enter deduster (6) after the flue gas mixing of preheater (3)；
Low-level (stack-gas) economizer is equipped in flue after the deduster (6), low-level (stack-gas) economizer is by pipeline and for first and second
The preposition steam air heater that wind is preheated is connected, and recirculated cooling water is connected in pipeline, and recirculated cooling water absorbs heat in low-level (stack-gas) economizer,
Then the heat release in preposition steam air heater；
The nozzle system (2) is distributed on the pipeline section of horizontal flue, and inversely arranges with flue gas flow direction, the nozzle system
The sodium carbonate liquor particle fog-like that system (2) sprays, and it is full of the pipeline section of entire horizontal flue；The sodium carbonate liquor supplies
It include sodium carbonate liquor preparation and storage system, SO to system3Density monitoring system and PID control metered dispensing unit, SO3It is dense
The entrance that monitoring system is set to the air preheater (3) is spent, PID control metered dispensing unit obtains SO in real time3Concentration prison
After the measuring signal that examining system provides, according to measuring signal by separate chemical agent flux control and Field pressure control valve come
Independent control prepared by sodium carbonate liquor and storage system to be transported to sodium carbonate in each nozzle in the nozzle system (2) molten
The injection rate of liquid.
2. a kind of smoke comprehensive energy-saving and emission-reduction system for taking into account low-temperature corrosion and UTILIZATION OF VESIDUAL HEAT IN as described in claim 1, special
Sign is: the sodium carbonate liquor concentration is according to SO in flue gas3Concentration is configured, the sodium carbonate liquor concentration mass concentration
Between 30%~50%, the outlet speed of each nozzle of the sodium carbonate liquor droplet particles in the nozzle system (2)
Degree is 60~80m/s, sodium carbonate and SO in the sodium carbonate liquor3Molar ratio is set as 1.5: 1~4: 1, sodium carbonate liquor
Size droplet diameter is less than 50um.
3. a kind of smoke comprehensive energy-saving and emission-reduction system for taking into account low-temperature corrosion and UTILIZATION OF VESIDUAL HEAT IN as described in claim 1, special
Sign is: being equipped with two-stage heat exchanger in the bypass flue (4), including is sequentially arranged in bypass flue (4) along flue gas flow direction
High-pressure feed water heat exchanger (7-1) and low pressure feed water heat exchanger (7-2), high-pressure feed water heat exchanger (7-1) and low pressure feed water heat exchange
High-pressure feed water and low pressure feed water are drawn from main feed water pipe road respectively in device (7-2), high-pressure feed water and low pressure feed water divide after being heated
The main feed water pipe road for not returning to respective bleeder heater outlet, mixes with main water supply.
4. a kind of smoke comprehensive energy-saving and emission-reduction system for taking into account low-temperature corrosion and UTILIZATION OF VESIDUAL HEAT IN as claimed in claim 3, special
Sign is: the high-pressure feed water heat exchanger (7-1) and low pressure feed water heat exchanger (7-2) are in parallel with respective bleeder heater.
5. a kind of smoke comprehensive energy-saving and emission-reduction system for taking into account low-temperature corrosion and UTILIZATION OF VESIDUAL HEAT IN as described in claim 3 or 4,
It is characterized in that: the bleeder heater and the corresponding high-pressure feed water heat exchanger (7-1) or the low pressure feed water heat exchanger (7-
2) proportion of feedwater flow is 0%~40%.
6. a kind of smoke comprehensive energy-saving and emission-reduction system for taking into account low-temperature corrosion and UTILIZATION OF VESIDUAL HEAT IN as described in claim 1, special
Sign is: entering the 10%~30% of the total exhaust gas volumn of exhaust gas volumn Zhan of the bypass flue (4).
7. a kind of smoke comprehensive energy-saving and emission-reduction system for taking into account low-temperature corrosion and UTILIZATION OF VESIDUAL HEAT IN as claimed in claim 3, special
Sign is: after being entered in flue in nozzle system (2) with misty liquid droplets, inverse flue gas flow direction flows sodium carbonate liquor, with
Flue gas uniformly mixes, and moisture is evaporated by flue gas drying；The SO that excessive powdered sodium carbonate particle is generated with burner hearth first3Progress in
With, after SCR catalyst layer (1) again with catalyst generate SO3It is neutralized, makes the SO in flue gas3Content reduces, flue gas
Acid dew-point temperature be down to water dew point；
On this basis, partial removal SO3Flue gas with NOx passes through in bypass flue (4) without air preheater (3)
Two-stage heat exchanger successively heats the high and low pressure water supply of double-bank heater, the cigarette of the flue gas after cooling and air preheater (3) outlet
Gas enters deduster (6) after mixing；And high and low pressure water supply returned to after being heated in respective heat exchanger main feed water pipe road with
The main water supply mixing of bleeder heater outlet；Into heater main feedwater flow reduce, the steam extraction amount of respective heater also with
Reduction, realize energy conservation；
Using low-level (stack-gas) economizer absorb after deduster (6) flue gas waste heat, and in preposition steam air heater to primary and secondary air into
Row preheating while preventing cold end blocking in air preheater (3), improves outlet wind-warm syndrome, further decreases outlet smoke temperature, realize
The cascade utilization of waste heat.
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| CN201710127994.7A CN107300188B (en) | 2017-03-06 | 2017-03-06 | A kind of smoke comprehensive energy-saving and emission-reduction system for taking into account low-temperature corrosion and UTILIZATION OF VESIDUAL HEAT IN |
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| CN201710127994.7A CN107300188B (en) | 2017-03-06 | 2017-03-06 | A kind of smoke comprehensive energy-saving and emission-reduction system for taking into account low-temperature corrosion and UTILIZATION OF VESIDUAL HEAT IN |
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| CN107300188B true CN107300188B (en) | 2019-07-02 |
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| US11850550B2 (en) | 2019-12-18 | 2023-12-26 | Sumitomo SHI FW Energia Oy | Arrangement for and a method of operating a steam boiler system |
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