CN107300188A - 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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- CN107300188A CN107300188A CN201710127994.7A CN201710127994A CN107300188A CN 107300188 A CN107300188 A CN 107300188A CN 201710127994 A CN201710127994 A CN 201710127994A CN 107300188 A CN107300188 A CN 107300188A
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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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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention provides a kind of smoke comprehensive energy-saving and emission-reduction system 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 provided with horizontal flue before SCR catalyst layer, nozzle system is connected with sodium carbonate liquor feed system；Connected between on rear side of SCR catalyst layer and on front side of deduster by bypass flue, heat exchanger is provided with bypass flue, flue gas goes out after SCR catalyst layer, most of flue gas is via flue collector air inlet preheater, remaining fraction flue gas cools into bypass flue via heat exchanger, and flue gas of the flue gas for going out bypass flue with going out air preheater enters deduster after mixing；Low-level (stack-gas) economizer is provided with flue after deduster, low-level (stack-gas) economizer is connected with preposition steam air heater.The system can reduce heated surface at the end of boiler fouling and clogging and low-temperature corrosion phenomenon, improve the utilization ratio 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 system discharged fume for boiler tail, for (special to coal unit
It is sulphur coal) boiler smoke progress SO3Removing to reduce acid dew point, and cascade utilization carried out to fume afterheat heat height respectively
Pressure feedwater, low pressure feed water and cold wind, so that fume afterheat utilization rate is improved on the premise of back-end surfaces low-temperature corrosion is avoided,
Belong to boiler technology field.
Background technology
In coal unit, with the reduction of flue-gas temperature, SO3It is gaseous state SO in furnace outlet3, in SCR catalyst outlet
Be changed into gaseous sulfuric acid, into wet desulphurization device after be further transformed to sulfuric acid aerosol, acidity progressively strengthens, to equipment
Corrosion also progressively strengthens.Influence to unit includes：First, improve acid dew-point temperature, so as to limit smoke temperature drop, influence is remaining
Recuperation of heat effect；2nd, SCR and air preheater ash deposit and slag buildup are made；3rd, " Lan Yu " phenomenon is produced.
At present, the denitrating system of domestic coal unit generally uses SCR technology (selective catalytic reduction), with NH3(urine
Element) it is reducing agent, will in the range 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 SO3React, increase ammonia spraying amount is carried
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 reduction influence NOxRemoval efficiency, makes air preheater fouling and clogging increase blower fan power consumption, forces unit blowing out deashing.
Country is not put into effect for SO also3The relevant criterion of discharge, existing main SO3Removing sulfuldioxide is to be removed 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 cleaner is removed, 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, at the same sulfuric acid vapor be condensed into absorption tower it is very thin
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 too high, limits the smoke temperature drop after air preheater, and the waste heat of afterbody is returned
Receiving unit be usually low-level (stack-gas) economizer to heat low pressure feed water, drawn gas with reducing #6 and #7.On the one hand, reduction draw gas quality compared with
Low, energy-saving effect is poor；On the other hand, heat exchanger materials need to select corrosion resistant ND steel, and need keep under strict control flue gas and metallic walls
Temperature is with anti-low-temperature corrosion phenomenon.
The content of the invention
The technical problem to be solved in the present invention is how to reduce heated surface at the end of boiler fouling and clogging and low-temperature corrosion phenomenon,
The utilization ratio of fume afterheat is improved, smoke comprehensive energy-saving and emission-reduction integration is realized.
In order to solve the above-mentioned technical problem, the technical scheme is that providing one kind takes 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 with flue
Air preheater and deduster are sequentially entered by SCR catalyst layer, it is characterised in that：Horizontal cigarette before the SCR catalyst layer
Nozzle system is provided with road, nozzle system is connected with sodium carbonate liquor feed system；
Connected, set in bypass flue by bypass flue between on rear side of the SCR catalyst layer and on front side of the deduster
There is heat exchanger, flue gas goes out after SCR catalyst layer, most of flue gas is via flue collector air inlet preheater, remaining fraction
Flue gas cools into bypass flue via heat exchanger, and flue gas of the flue gas for going out bypass flue with going out air preheater enters after mixing
Deduster；
Low-level (stack-gas) economizer is provided with flue after the deduster, low-level (stack-gas) economizer is by pipeline with being used for one, two
The preposition steam air heater that secondary wind is preheated is connected, and recirculated cooling water is connected with 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 that the nozzle system sprays is in mist particles, and is full of the pipe of whole 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 at the import of the air preheater, PID control meter
Amount distributor obtains SO in real time3After the measurement signal that density monitoring system is provided, separate chemical agent is passed through according to measurement signal
Flow is controlled and Field pressure control valve carrys out independent control and is 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
Mass concentration is between 30%~50%, and each nozzle of the sodium carbonate liquor droplet particles in the nozzle system goes out
Mouth speed is sodium carbonate and SO in 60~80m/s, the sodium carbonate liquor3Mol ratio is set to 1.5: 1~4: 1, and sodium carbonate is molten
The size droplet diameter of liquid is less than 50um.
Preferably, two-stage heat exchanger is provided with the bypass flue, including bypass flue is sequentially arranged in along flue gas flow direction
Given respectively from master in interior high-pressure feed water heat exchanger and low pressure feed water heat exchanger, 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, is mixed with main feedwater.
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 proportioning of water-carrying capacity is 0%~40%.
Preferably, the exhaust gas volumn into the bypass flue accounts for the 10%~30% of total exhaust gas volumn.
What the present invention was provided takes into account the smoke comprehensive energy-saving and emission-reduction system specific workflow of low-temperature corrosion and UTILIZATION OF VESIDUAL HEAT IN
It is as follows：
After sodium carbonate liquor is entered in flue from nozzle with misty liquid droplets, inverse flue gas flow direction is flowed after a segment distance
Uniformly mixed with flue gas, moisture is evaporated by flue gas rapid draing, the SO that excessive powdered sodium carbonate particle is produced with burner hearth first3
Neutralized, with the generation of catalyst again SO after SCR3Neutralized, make the SO in flue gas3Content is greatly reduced, flue gas
Acid dew-point temperature is down near water dew point, so that flue gas has larger cooling space and waste heat recovery potentiality.It is basic herein
On, partial removal SO3And NOxFlue gas without air preheater, in bypass flue pass through heat exchanger successively heating two-step heating
The high and low pressure feedwater of device, the flue gas after cooling mixes with the flue gas that air preheater is exported, uniformly after enter deduster.And high and low pressure
Feedwater returns to main feed water pipe road after being heated in respective heat exchanger and mixed with the main feedwater that bleeder heater is exported, into heating
The main feedwater flow of device is reduced, and the amount of drawing gas of respective heater also decreases to reach the purpose of energy-conservation.Cigarette in air preheater
The reduction of tolerance, can cause the decline of first and second wind-warm syndrome reduces boiler efficiency, therefore is absorbed using low-level (stack-gas) economizer by removing
The waste heat of flue gas after dirt device, and being preheated in preposition steam air heater to primary and secondary air, prevents cold end in air preheater from blocking same
When, outlet wind-warm syndrome is improved, further reduction outlet cigarette temperature, from the cascade utilization for realizing waste heat.
The system that the present invention is provided before SCR catalyst layer by spraying into sodium carbonate liquor, to absorb the SO in flue gas3,
So as to which acid dew-point temperature is greatly reduced, back-end surfaces fouling and clogging 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 making the number of plies of air preheater increase to improve heat exchange area), in SCR
Flue gas is set after catalyst layer and bypassed, high and low pressure feedwater is heated respectively in bypass flue；In the flue after deduster
Low-level (stack-gas) economizer is arranged, cooling water therein preheats primary and secondary air by preposition steam air heater, effectively heated using fume afterheat high
Pressure feedwater, low pressure feed water and cold wind, so as to meet the requirement that fume afterheat is efficiently utilized, realize smoke comprehensive energy-saving and emission-reduction one
Change.
The system can remove SO in flue gas3More than 85%, 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 reduced；Low-temperature corrosion is not present in back-end ductwork and equipment
And blocking, operational efficiency and security are higher.
Compared with prior art, the present invention has the advantages that：
1st, efficiently, ejecta replaces powder particle to simple system with solution, with the more preferable uniformity and reactivity,
SO3Removal efficiency can be to more than 85%, and can cooperation-removal HCl, HF, H2SeO3Deng acidic materials.Be conducive to flying dust to Hg simultaneously
Capture, play comprehensive emission reduction effect.
2nd, spraying system is placed in before spray ammonia system, the SO in flue gas3Reacted first with sodium carbonate, so as to reduce denitration
Throwing ammonia amount used, making the operation expense of throwing denitrating system reduces.
3rd, spraying system is placed in before SCR denitration layer, flue gas middle acid substance (particularly SO3) removing can effectively reduce
The minimum activationary temperature of catalytic component based on vanadium, 268 DEG C are reduced to by 315 DEG C generally acknowledged, are conducive to underload to throw denitration.With it is traditional
The wide load denitration such as technology such as hot water re-circulation, economizer classification, gas bypass is compared, and improvement expenses is low and to boiler efficiency shadow
Sound is small, can fundamentally solve the problem of SCR denitration compels to move back under underload.In addition, without inactivation, abrasion or being blocked in catalyst layer
Problem, SCR denitration efficiency high, service life is long.
4th, without NH in air preheater4HSO4(ABS) fouling and clogging, blower fan is low in energy consumption, good effect of heat exchange.Acid dew-point temperature
It is reduced to by more than 100 DEG C near water dew point (40 DEG C), low-temperature corrosion and blocking, operation is not present in flue gas back-end ductwork and equipment
Efficiency and security are higher.In Late reformation, heat exchange facestock can be used as using tradition, the more preferable carbon steel or stainless steel of heat exchange property
Material, improvement expenses is lower, and waste heat recovery is more efficient.
5th, after acid dew-point temperature is greatly reduced, flue gas has larger 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, the requirement that fume afterheat is efficiently utilized is met, energy is realized
The cascade utilization in source.
Brief description of the drawings
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 representation；
Fig. 3 illustrates for the operation that double-bank heater in gas bypass is used to heat high-low pressure feedwater to reduce regenerative steam
Figure.
Embodiment
With reference to specific embodiment, the present invention is expanded on further.It should be understood that these embodiments are merely to illustrate the present invention
Rather than limitation the scope of the present invention.In addition, it is to be understood that after the content of the invention lectured has been read, people in the art
Member can make various changes or modifications to the present invention, and these equivalent form of values equally fall within the application appended claims and limited
Scope.
Using certain power plant 660MW ultra supercriticals wet type cooling unit as object, due to burning high sulfur coal, in THA operating mode down smoke-discharging temperature
Up to 130 DEG C of degree, fume side pressure difference is more than conversion sulphur content in 3kPa, flue gas and, up to 0.74%, 2% meter of total sulphur content is accounted for according to SO3,
Acid dew-point temperature is also up to more than 140 DEG C.The high fume temperature that is brought for its burning high sulfur coal, air preheater resistance be big and flue
The problems such as back-end surfaces low-temperature corrosion, present embodiments provide 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, according to the different effect of system, sodium carbonate liquor feed system (Fig. 2), high temperature cigarette can be divided into
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 to storage between storage, it is contemplated that the storage for having seven days is needed between security 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, it is considered to
To security, solution reservoir 13 need to have the storage of 3 days.Now, the SO arranged according to the import of air preheater 33Concentration monitor
(including the SO3 and SCR catalyst layer of burner hearth generation are produced) SO herein shown by system3Concentration, passes through PID control metering point
With device, by the cooperation of regulating valve and instrument (densitometer, flowmeter etc.), accurate adjustment 3t/h solution 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 insulation simultaneously
Or crystallization.Solution in main pipe uniformly enters each atomizer of nozzle system 2, and atomizer is by solution with 30um grain
Footpath, the 80m/s reverse injection flue of jet velocity, are well mixed with flue gas.Moisture in solution rapid evaporation, shape after the implantation
Into the smaller solid particle of particle diameter, higher reaction specific surface area makes it have faster reaction efficiency, generation in titanium dioxide
Carbon gas ruptures particle expansion, and " puffed rice " effect caused further improves reactivity and speed, to SO in flue3
Progressively adsorb, it is reduced to 3~5ppm, removal efficiency height is to 90%, and the product sodium sulphate of 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, thus tail flue gas have it is larger
Cool space to obtain preferable energy-saving benefit.By setting high-temperature flue gas bypath system, by after SCR catalyst layer 1 350
DEG C high-temperature flue gas, shunting 20% enter bypass flue 4 in, remaining flue gas enter flue collector 5.The priority cloth in bypass flue 4
Two-stage heat exchanger is put, for heating high and low pressure feedwater 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 height and adds to water and #6 height adds to water, goes out respectively with each self-corresponding bleeder heater after heating
The main feedwater 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, so as to reduce
30% #3 height adds to water and #6 height adds to water and drawn gas, and in general reduces coal consumption 5g/kWh.
And 80% flue gas, to prevent stove effect reduction, should ensure that the two of 320 DEG C via the air inlet preheater 3 of flue collector 5
Secondary wind inlet wind-warm syndrome, need to strengthen cigarette in air preheater 3-wind heat exchange.Therefore, effect need to be put forward to air preheater 3, increase air is pre-
The floor height of hot device 3 and its heat exchange element is changed, while enhanced heat exchange ensures secondary air temperature, flue gas exit temperature is 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
Recirculated cooling water in warm economizer, pipeline absorbs fume afterheat, 90 DEG C of flue gas is further 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 warming up to 40 DEG C by 20 DEG C, and cooling water
Move in circles.
In general, unit is used after the system, SO3Concentration is reduced to 3ppm, and can cooperation-removal HCl, HF, H2SeO3
Deng acidic materials, be conducive to capture of the flying dust to Hg, cigarette temperature drop is low and sodium salt input 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 be prevented effectively from low temperature rotten
Erosion, back-end surfaces can select heat exchange property more preferably, the stainless steel of cheaper, while substantially reduce the O＆M in later stage into
This；The minimum activationary temperatures of SCR is reduced to 286 DEG C by 315 DEG C, be conducive to underload to throw denitration, and alleviate in catalyst layer
Inactivation, abrasion and blockage problem, improve denitration efficiency 5%, while can reduce generation ABS cause ammonia loss, reduction spray ammonia into
This；The rise of cold wind temperature, SO3Removing and air preheater upgrading, substantially avoided the black dirt in air preheater and stockpile and ABS
Block, improve heat transfer effect while reduction blower fan power consumption, save substantial amounts of cost of investment and equipment replacement maintenance cost；It is de-
Sulphur tower import cigarette temperature drop is low 20 DEG C, greatly reduces desulfurizing tower rate of water make-up；The cooling space of 30~40 DEG C of flue gases is added, effectively
Using fume afterheat stepped heating high-pressure feed water, low pressure feed water and cold wind, the requirement that fume afterheat is efficiently utilized is met, energy is realized
The cascade utilization in source.So as to which the system can obtain the comprehensive benefit of energy-conservation, emission reduction and water-saving, it is possible to decrease coal consumption 5.5g/kWh.
Claims (10)
1. in a kind of smoke comprehensive energy-saving and emission-reduction system for taking into account low-temperature corrosion and UTILIZATION OF VESIDUAL HEAT IN, flue SCR is disposed with to urge
Agent layer (1), air preheater (3) and deduster (6), flue gas sequentially enter air preheater via SCR catalyst layer (1)
And deduster (6) (3), it is characterised in that：Nozzle system (2), spray are provided with horizontal flue before the SCR catalyst layer (1)
Mouth system (2) is connected with sodium carbonate liquor feed system；
It is connected on rear side of the SCR catalyst layer (1) between the deduster (6) front side by bypass flue (4), bypass flue
(4) heat exchanger is provided with, flue gas goes out after SCR catalyst layer (1), and most of flue gas is via flue collector (5) air inlet preheater
(3), remaining fraction flue gas cools into bypass flue (4) via heat exchanger, goes out the flue gas of bypass flue (4) and goes out air
Enter deduster (6) after the flue gas mixing of preheater (3)；
Low-level (stack-gas) economizer is provided with flue after the deduster (6), low-level (stack-gas) economizer is by pipeline with being used for first and second
The preposition steam air heater that wind is preheated is connected, and recirculated cooling water is connected with pipeline, recirculated cooling water absorbs heat in low-level (stack-gas) economizer,
Then the heat release in preposition steam air heater.
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 claimed in claim 1, it is special
Levy and be：The nozzle system (2) is distributed on the pipeline section of horizontal flue, and is inversely arranged with flue gas flow direction.
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 claimed in claim 1 or 2, its
It is characterised by：The sodium carbonate liquor that the nozzle system (2) sprays is in mist particles, and is full of the pipeline section of whole horizontal flue
Face.
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 1, it is special
Levy and be：The sodium carbonate liquor feed system includes sodium carbonate liquor and prepared and storage system, SO3Density monitoring system and
PID control metered dispensing unit, SO3Density monitoring system is at the import of the air preheater (3), PID control metering
Distributor obtains SO in real time3After the measurement signal that density monitoring system is provided, separate chemical agent stream is passed through according to measurement signal
Amount control and Field pressure control valve carry out independent control and are transported to the nozzle system by sodium carbonate liquor preparation and storage system
The injection rate of sodium carbonate liquor in each nozzle in system (2).
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 1 or 4, its
It is characterised by：The sodium carbonate liquor concentration is according to SO in flue gas3Concentration is configured, and the sodium carbonate liquor concentration quality is dense
Degree is between 30%~50%, the outlet of each nozzle of the sodium carbonate liquor droplet particles in the nozzle system (2)
Speed is sodium carbonate and SO in 60~80m/s, the sodium carbonate liquor3Mol ratio is set to 1.5: 1~4: 1, sodium carbonate liquor
Size droplet diameter be less than 50um.
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 claimed in claim 1, it is special
Levy and be：Two-stage heat exchanger is provided with the bypass flue (4), including is sequentially arranged in along flue gas flow direction in bypass flue (4)
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 of respective bleeder heater outlet is not returned to, is mixed with main feedwater.
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 6, it is special
Levy and be：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.
8. 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 claims 6 or 7, its
It is characterised by：The bleeder heater and the corresponding high-pressure feed water heat exchanger (7-1) or the low pressure feed water heat exchanger (7-
2) proportioning of feedwater flow is 0%~40%.
9. 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 1, it is special
Levy and be：Exhaust gas volumn into the bypass flue (4) accounts for the 10%~30% of total exhaust gas volumn.
10. 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 6, it is special
Levy and be：After sodium carbonate liquor is entered in flue from nozzle system (2) with misty liquid droplets, inverse flue gas flow direction flowing, with
Flue gas is uniformly mixed, and moisture is evaporated by flue gas drying；The SO that excessive powdered sodium carbonate particle is produced with burner hearth first3Progress in
With, after SCR catalyst layer (1) again with catalyst generate SO3Neutralized, make the SO in flue gas3Content is reduced, flue gas
Acid dew-point temperature be down to water dew point；
On this basis, partial removal SO3And NOxFlue gas without air preheater (3), pass through in bypass flue (4)
Two-stage heat exchanger successively heats the high and low pressure feedwater of double-bank heater, the cigarette that the flue gas after cooling is exported with air preheater (3)
Enter deduster (6) after gas is well mixed；And high and low pressure feedwater in respective heat exchanger be heated after return to main feed water pipe road with
The main feedwater mixing of bleeder heater outlet；Main feedwater flow into heater is reduced, the amount of drawing gas of respective heater also with
Reduction, realize energy-conservation；
The waste heat of the flue gas after deduster (6) is absorbed using low-level (stack-gas) economizer, and primary and secondary air is entered in preposition steam air heater
Row preheating, while preventing that cold end is blocked in air preheater (3), improves outlet wind-warm syndrome, further reduction outlet cigarette temperature, is realized
The cascade utilization of waste heat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107300188A true CN107300188A (en) | 2017-10-27 |
| CN107300188B CN107300188B (en) | 2019-07-02 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108800598A (en) * | 2018-06-22 | 2018-11-13 | 中国电建集团都江电力设备有限公司 | Flue gas heat recovery combines the wide load adjustment method of the double bypasses of steam air heater |
| CN109404958A (en) * | 2018-11-12 | 2019-03-01 | 南京博沃科技发展有限公司 | A kind of energy efficiency anti-blocking method and system based on air preheater bypass flue |
| CN109612074A (en) * | 2018-12-17 | 2019-04-12 | 成都前锋电子有限责任公司 | A kind of gas heater of the bypass pipe with water transfer proportioning valve |
| CN109647191A (en) * | 2019-02-13 | 2019-04-19 | 江苏鲲鹏环保工程技术有限公司 | A kind of air preheater device with denitration function |
| CN111603928A (en) * | 2020-05-24 | 2020-09-01 | 西安交通大学 | Efficient, clean and flexible cooperative coal-fired power generation system and operation method |
| CN113654074A (en) * | 2021-08-27 | 2021-11-16 | 西安热工研究院有限公司 | Flue gas bin-bypass heat regeneration energy-saving system based on air preheater heat transfer deviation |
| CN114110638A (en) * | 2021-11-26 | 2022-03-01 | 西安热工研究院有限公司 | Automatic regulating system and method for efficient flue gas waste heat utilization of air preheater bypass |
| US20230016404A1 (en) * | 2019-12-18 | 2023-01-19 | Sumitomo SHI FW Energia Oy | Arrangement for and a method of operating a steam boiler system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101062461A (en) * | 2007-04-27 | 2007-10-31 | 南京师范大学 | Method and system for combinablenably removing SO2, NOx and Hg in coal smoke gas by using recombustion of biomass |
| CN201454354U (en) * | 2009-06-22 | 2010-05-12 | 杭州三和环保技术工程有限公司 | Semi-dry smoke pollutant removing device |
| CN102305413A (en) * | 2011-07-28 | 2012-01-04 | 中国电力工程顾问集团西南电力设计院 | Exhaust gas waste heat recovery and emission reduction comprehensive application system for coal-fired boiler in thermal power plant |
| CN105444195A (en) * | 2015-12-25 | 2016-03-30 | 中电投远达环保工程有限公司 | Multi-pollutant synergistic treating method and system for coal-fired flue gas |
| CN105934268A (en) * | 2014-01-31 | 2016-09-07 | 三菱日立电力***株式会社 | Lime supply device and exhaust gas treatment system |
-
2017
- 2017-03-06 CN CN201710127994.7A patent/CN107300188B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101062461A (en) * | 2007-04-27 | 2007-10-31 | 南京师范大学 | Method and system for combinablenably removing SO2, NOx and Hg in coal smoke gas by using recombustion of biomass |
| CN201454354U (en) * | 2009-06-22 | 2010-05-12 | 杭州三和环保技术工程有限公司 | Semi-dry smoke pollutant removing device |
| CN102305413A (en) * | 2011-07-28 | 2012-01-04 | 中国电力工程顾问集团西南电力设计院 | Exhaust gas waste heat recovery and emission reduction comprehensive application system for coal-fired boiler in thermal power plant |
| CN105934268A (en) * | 2014-01-31 | 2016-09-07 | 三菱日立电力***株式会社 | Lime supply device and exhaust gas treatment system |
| CN105444195A (en) * | 2015-12-25 | 2016-03-30 | 中电投远达环保工程有限公司 | Multi-pollutant synergistic treating method and system for coal-fired flue gas |
Non-Patent Citations (1)
| Title |
|---|
| 韩宇等: "一种燃煤电站清洁高效协同余热利用***", 《中国电机工程学报》 * |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108800598A (en) * | 2018-06-22 | 2018-11-13 | 中国电建集团都江电力设备有限公司 | Flue gas heat recovery combines the wide load adjustment method of the double bypasses of steam air heater |
| CN108800598B (en) * | 2018-06-22 | 2020-08-18 | 中国电建集团都江电力设备有限公司 | Flue gas waste heat recycling combined air heater double-bypass wide-load adjusting method |
| CN109404958A (en) * | 2018-11-12 | 2019-03-01 | 南京博沃科技发展有限公司 | A kind of energy efficiency anti-blocking method and system based on air preheater bypass flue |
| CN109404958B (en) * | 2018-11-12 | 2024-02-02 | 南京博沃科技发展有限公司 | Energy-saving synergistic anti-blocking method and system based on bypass flue of air preheater |
| CN109612074A (en) * | 2018-12-17 | 2019-04-12 | 成都前锋电子有限责任公司 | A kind of gas heater of the bypass pipe with water transfer proportioning valve |
| CN109647191A (en) * | 2019-02-13 | 2019-04-19 | 江苏鲲鹏环保工程技术有限公司 | A kind of air preheater device with denitration function |
| US20230016404A1 (en) * | 2019-12-18 | 2023-01-19 | Sumitomo SHI FW Energia Oy | Arrangement for and a method of operating a steam boiler system |
| US11850550B2 (en) * | 2019-12-18 | 2023-12-26 | Sumitomo SHI FW Energia Oy | Arrangement for and a method of operating a steam boiler system |
| CN111603928A (en) * | 2020-05-24 | 2020-09-01 | 西安交通大学 | Efficient, clean and flexible cooperative coal-fired power generation system and operation method |
| CN113654074A (en) * | 2021-08-27 | 2021-11-16 | 西安热工研究院有限公司 | Flue gas bin-bypass heat regeneration energy-saving system based on air preheater heat transfer deviation |
| CN114110638A (en) * | 2021-11-26 | 2022-03-01 | 西安热工研究院有限公司 | Automatic regulating system and method for efficient flue gas waste heat utilization of air preheater bypass |
| CN114110638B (en) * | 2021-11-26 | 2024-01-19 | 西安热工研究院有限公司 | Automatic regulating system and method for efficient flue gas waste heat utilization of bypass of air preheater |
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