CN104100994B - A kind of based on flue gas waste heat recovery and the boiler energy-saving emission-reduction system of thermal technology again - Google Patents
A kind of based on flue gas waste heat recovery and the boiler energy-saving emission-reduction system of thermal technology again Download PDFInfo
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- CN104100994B CN104100994B CN201410317045.1A CN201410317045A CN104100994B CN 104100994 B CN104100994 B CN 104100994B CN 201410317045 A CN201410317045 A CN 201410317045A CN 104100994 B CN104100994 B CN 104100994B
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- 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
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
nullThe invention discloses a kind of based on flue gas waste heat recovery and the boiler energy-saving emission-reduction system of thermal technology again，Including air preheater、Gas cooler、Electrostatic precipitator、Desulfurizing tower、Smoke re-heater and chimney，The smoke inlet of air preheater is connected with the exhanst gas outlet of boiler，The exhanst gas outlet of air preheater is connected with the smoke inlet of gas cooler，The exhanst gas outlet of gas cooler is connected with the smoke inlet of electrostatic precipitator，The exhanst gas outlet of electrostatic precipitator is connected with the tail flue gas entrance of desulfurizing tower，The desulfurization fume outlet of desulfurizing tower is connected with the smoke inlet of smoke re-heater，The reheating exhanst gas outlet of smoke re-heater is connected with the smoke inlet of chimney，The hot water outlet of gas cooler is connected with the hot water inlet of smoke re-heater，The cooling water outlet of smoke re-heater is connected with the cold water inlet of gas cooler by booster pump.The present invention can to boiler produce flue gas process, service life length, energy-conserving and environment-protective.
Description
Technical field
The invention belongs to station boiler field, relate to a kind of energy-saving and emission-reduction system, be specifically related to one
Based on flue gas waste heat recovery and the boiler energy-saving emission-reduction system of thermal technology again.
Background technology
Coal is the primary energy that China is main, coal fired power generation in power generation predominantly
Position.This energy resource structure will not change within one the most considerably long period.Need at current energy source
Ask under vigorous, coal supply intense situation, develop efficient, energy-conservation, Large Copacity, clean environmental protection,
The generation technology that reliability is high, can not only meet national economy fast development and be essential the urgent of electric power
Want, and cope with from the increasingly serious requirement in terms of environmental conservation and challenge.Along with entirely
The ball raising day by day to environmental protection requirement, China is more and more higher to the standard of environmental conservation.2011
Year, country promulgated new " fossil-fuel power plant atmospheric pollutant emission standard " (GB13223-2011), and
Enforcement in 2012.Relative to former standard, further increase thermal power plant SO2、NOx
And the discharge standard of flue dust, reach even better than international most advanced level.
Exhaust gas temperature is the important indicator that power plant runs, and exhaust gas temperature is higher not only can be substantially reduced pot
The efficiency of stove, also can have a negative impact to all devices of boiler back end ductwork.Exhaust gas temperature pair
Boiler safety, the impact of economy are mainly manifested in the following aspects:
1) exhaust gas temperature raises, and makes exhaust gas volumn increase, thus reduces the specific dust collection area of electric cleaner,
Shorten the fly ash granule time of staying in electric precipitation, affect the sedimentation of flying dust, reduce electric cleaner
Efficiency.
2) exhaust gas temperature raises, and fly ash resistivity will rise to 1011More than (Ω cm), flying dust
Enter than resistance and be not suitable for, in the range of electric precipitation work, greatly reducing the efficiency of electric cleaner.
3) exhaust gas temperature raises so that blower fan, cleaner unit working environment deteriorate, and shortens the longevity of equipment
Life, adds accident rate, affects unit safety.
4) for wet desulfurization system, exhaust gas temperature is too high to be strengthened the water consumption making desulphurization system,
The water resource that waste is precious.
5) flue gas after wet desulphurization is saturated flue gas, and the water vapour content in flue gas is greatly increased,
The operating condition of chimney will drastically deteriorate, corrosion aggravation, affect unit safety.
Thermal power plant consumes the 50% of coal in China total output, and its heat loss due to exhaust gas is station boiler
Maximum in various heat losses one, typically 5%～8%, exhaust gas temperature often raises 15 DEG C, row
Cigarette heat loss increases by 0.6%～1.0%.In China's active service fired power generating unit, exhaust gas temperature generally maintains
125～150 DEG C of left and right horizontal, high fume temperature is a universal phenomenon.
Flue-gas temperature after wet desulphurization is generally about 50 DEG C, SO a small amount of in flue gas3Steam with water
Vapour combines and generates H2SO4Steam just can significantly improve flue gas dew point temperature, and traditional desulfurization system
Unite to removal efficiency be only 20%～about 30%, after therefore the flue gas through wet desulphurization enters chimney,
H2SO4Condense, chimney will be produced stronger corrosion.Flue gas after desulfurization carries saturated steam,
SO in flue gas2, Cl2, fluorochemical, NO2H is produced respectively Deng being combined with steam2SO3,
HCl, HF, HNO2Deng, a little higher than water dew point of dew point temperature of these acid vapors, therefore when full
After entering chimney with wet flue gas, these acid will condense in a large number, and chimney is produced strong corrosion.
Can be seen that the corrosion effectively slowing down chimney needs to take two measures, one is to be greatly improved
SO3Removal efficiency so that the SO in flue gas3Content, close to 0, contains H2SO4Corrosion,
Another measure is the flue-gas temperature improving and entering chimney, stops H2SO3, HCl, HF, HNO2
Deng corrosion.
The diffusivity of pollutant is directly proportional to the rising height of flue gas, and atmosphere hoist height is main
Depend on the difference of exit gas temperature and ambient temperature.Therefore, the height of exhaust gas temperature is dirty to flue gas
The diffusivity of dye thing plays an important role.When exhaust gas temperature is relatively low, the rising height of flue gas is also
Decreasing, diffusivity is poor, and the flooring concentration of near power station pollutant will increase.And desulfurization
After from chimney discharge flue gas be in saturation, when ambient temperature is relatively low condense steam can be formed
The plume of white.Although it is flue gas water vapour after desulfurization that chimney of electric plant emits " white cigarette " phenomenon
Vaporization is caused, harmless, but due to the refraction action of light, the most in the winter time, makes cigarette
Gas seems denseer, easily causes visual pollution, causes the Psychological phobia of masses.
Summary of the invention
It is an object of the invention to the shortcoming overcoming above-mentioned prior art, it is provided that a kind of based on flue gas
The boiler energy-saving emission-reduction system of waste heat recovery and again thermal technology, boiler can effectively be produced by this system
Raw flue gas processes, and length in service life, energy-conserving and environment-protective.
For reaching above-mentioned purpose, of the present invention based on flue gas waste heat recovery and the pot of thermal technology again
Stove energy-saving and emission-reduction system include air preheater, gas cooler, electrostatic precipitator, desulfurizing tower,
Smoke re-heater and chimney, the smoke inlet of air preheater is connected with the exhanst gas outlet of boiler,
The exhanst gas outlet of air preheater is connected with the smoke inlet of gas cooler, gas cooler
Exhanst gas outlet is connected with the smoke inlet of electrostatic precipitator, and the exhanst gas outlet of electrostatic precipitator is with de-
The tail flue gas entrance of sulfur tower is connected, the desulfurization fume outlet of desulfurizing tower and the cigarette of smoke re-heater
Gas entrance is connected, and the reheating exhanst gas outlet of smoke re-heater is connected with the smoke inlet of chimney,
The hot water outlet of gas cooler is connected with the hot water inlet of smoke re-heater, smoke re-heater
Cooling water outlet is connected with the cold water inlet of gas cooler by booster pump.
Air inducing is passed through between exhanst gas outlet and the tail flue gas entrance of desulfurizing tower of described electrostatic precipitator
Machine is connected.
Also include steam heater, the first controller and export hot water for detecting gas cooler
The first temperature sensor of temperature, the hot water outlet of gas cooler and the hot water of smoke re-heater
Be connected by the first valve between entrance, the entrance of steam heater and the entrance of the first valve it
Between be connected by the second valve, steam heater outlet with the outlet of the first valve between pass through
3rd valve is connected, and the outfan of the first temperature sensor and the input of the first controller are connected
Connect, the outfan of the first controller and the first valve control end, the control end of the second valve and the
The control end of three valves is connected.
Also include second controller, the 4th valve and for detect gas cooler output cigarette
Second temperature sensor of the temperature of gas, the hot water outlet of gas cooler and cold water inlet are by the
Four valves are connected, and the outfan of the second temperature sensor is connected with the input of second controller,
The outfan of second controller and the control end of the 4th valve are connected.
Also include N level low-pressure heater, three-temperature sensor, the 3rd controller, the 5th valve,
6th valve and for detecting the 3rd temperature sensing of temperature of the hot water of gas cooler output
Device, the entrance of N level low-pressure heater is connected by the 5th valve with the entrance of booster pump, N level
The outlet of low-pressure heater is connected with the hot water outlet of gas cooler by the 6th valve, and the 3rd
The outfan of temperature sensor and the input of the 3rd controller are connected, the output of the 3rd controller
End is connected with the control end of the 6th valve.
Soot blower on gas cooler is acoustic wave ash ejector, and the soot blower on smoke re-heater is for steaming
Vapour soot blower.
Described gas cooler includes the first header, the second header and some first heat-exchanger rigs,
The cooling water inlet of the first header is connected with the coolant outlet of smoke re-heater by booster pump,
First heat-exchanger rig includes the 3rd header, the first heating surface and the 4th header, the 3rd header enter water
Mouth is connected with the outlet of the first header, heat exchange in the outlet of the 3rd header and the first heating surface
The water inlet of pipe is connected, the outlet of heat exchanger tube and the water inlet of the 4th header in the first heating surface
Being connected, the outlet of the 4th header and the water inlet of the second header are connected, going out of the second header
The hot water inlet of mouth of a river smoke re-heater is connected, and the exhanst gas outlet of air preheater is subject to each first
The smoke inlet of hot side is connected, the exhanst gas outlet on each first heating surface and the cigarette of electrostatic precipitator
Gas entrance is connected.
Described smoke re-heater includes the first heat-exchange system and the second heat-exchange system, the first heat-exchange system
And second heat-exchange system all include the 5th header, the 6th header and some second heat-exchanger rigs, second
Heat-exchanger rig includes the 7th header, the 8th header and the second heating surface, the water inlet of the 7th header with
The outlet of the 5th header is connected, heat exchanger tube in the outlet of the 7th header and the second heating surface
Water inlet is connected, and in the second heating surface, the outlet of heat-transfer surface and the water inlet of the 8th header are connected
Logical, the outlet of the 8th header and the water inlet of the 6th header are connected, in the first heat-exchange system the
The water inlet of five headers is connected with the hot water outlet of gas cooler, in the first heat-exchange system the 6th
In the outlet of header and the second heat-exchange system, the water inlet of the 5th header is connected, the second heat exchange system
In system, the outlet of the 6th header is connected with the cooling water inlet of gas cooler, taking off of desulfurizing tower
Sulfur exhanst gas outlet is connected with the smoke inlet on each second heating surface, the cigarette on each second heating surface
Gas outlet is connected with the smoke inlet of chimney.
In described gas cooler the first heat change intrasystem first heating surface made by ND and
Becoming, the first heating surface uses H type finned tube in-line counter-flow arrangement.
In described smoke re-heater, the first heat changes intrasystem second heating surface by plastic steel or two-phase
Rustless steel is made, and the second heating surface uses light pipe stagger arrangement counter-flow arrangement；
In described smoke re-heater, the second heating surface in the second heat-exchange system is made by 316L steel
Form；Second heating surface uses H type finned tube in-line counter-flow arrangement.
The method have the advantages that
Boiler energy-saving emission-reduction system based on flue gas waste heat recovery and thermal technology more of the present invention exists
During boiler smoke is processed, first pass through the flue gas that boiler produces by air preheater and enter
Row processes, and forms pre-heat smoke, and pre-heat smoke is cooled into cooled flue gas through gas cooler, makes
Sulfuric acid vapor in flue gas is condensed into acid mist, and condenses on the soot particle in flue gas, thus effectively
Reduce the ratio resistance of flying dust in flue gas, reduce the flow of flue gas, improve the efficiency of electrostatic precipitator,
Flue gas heats through smoke re-heater after electrostatic precipitator dedusting and desulfurizing tower desulfurization again, forms reheating
Discharge through chimney after flue gas, effectively reduce the flue gas corrosivity to chimney, improve the lifting of flue gas
Height and the diffusivity of pollutant.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the structural representation of gas cooler 3 in the present invention；
Fig. 3 is the structural representation of smoke re-heater 8 in the present invention.
Wherein, 1 be boiler, 2 be air preheater, 3 be gas cooler, 4 for sonic soot blowing
Device, 5 be electrostatic precipitator, 6 be air-introduced machine, 7 be desulfurizing tower, 8 be smoke re-heater, 9 be
Steam sootblower, 10 be chimney, 11 for steam heater, 12 for N level low-pressure heater, 13
For booster pump, 14 be the first header, 15 be the second header, 16 be the first heating surface, 17 be
Three headers, 18 be the 4th header, 19 be the 5th header, 20 be the 6th header, 21 be second to be subject to
Hot side, 22 be the 7th header, 23 be the 8th header.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is described in further detail:
With reference to Fig. 1, of the present invention based on flue gas waste heat recovery and the boiler energy-saving of thermal technology again
Emission-reducing system include air preheater 2, gas cooler 3, electrostatic precipitator 5, desulfurizing tower 7,
The exhanst gas outlet of smoke re-heater 8 and chimney 10, the smoke inlet of air preheater 2 and boiler 1
Being connected, the exhanst gas outlet of air preheater 2 is connected with the smoke inlet of gas cooler 3,
The exhanst gas outlet of gas cooler 3 is connected with the smoke inlet of electrostatic precipitator 5, electrostatic precipitation
The exhanst gas outlet of device 5 is connected with the tail flue gas entrance of desulfurizing tower 7, the desulfurization cigarette of desulfurizing tower 7
Gas outlet is connected with the smoke inlet of smoke re-heater 8, and the heat smoke again of smoke re-heater 8 goes out
Mouth is connected with the smoke inlet of chimney 10, the hot water outlet of gas cooler 3 and smoke re-heater
The hot water inlet of 8 is connected, and the cooling water outlet of smoke re-heater 8 is cold with flue gas by booster pump 13
But the cold water inlet of device 3 is connected, the exhanst gas outlet of electrostatic precipitator 5 and the afterbody of desulfurizing tower 7
It is connected by air-introduced machine 6 between smoke inlet.
Present invention additionally comprises steam heater the 11, first controller and for detecting gas cooler
First temperature sensor of the temperature of 3 output hot water, the hot water outlet of gas cooler 3 and flue gas
Be connected by the first valve between the hot water inlet of reheater 8, the entrance of steam heater 11 with
It is connected by the second valve between the entrance of the first valve, the outlet of steam heater 11 and first
It is connected by the 3rd valve between the outlet of valve, the outfan of the first temperature sensor and first
The input of controller is connected, the outfan of the first controller and the control end of the first valve,
The control end controlling end and the 3rd valve of two valves is connected.
Present invention additionally comprises second controller, the 4th valve and for detecting gas cooler 3
Second temperature sensor of the temperature of the flue gas of output, the hot water outlet of gas cooler 3 and cold water
Entrance is connected by the 4th valve, and the outfan of the second temperature sensor is defeated with second controller
Entering end to be connected, the outfan of second controller and the control end of the 4th valve are connected.
Present invention additionally comprises N level low-pressure heater 12, three-temperature sensor, the 3rd controller,
5th valve, the 6th valve and for detecting the of the temperature of the hot water of gas cooler 3 output
Three-temperature sensor, the entrance of N level low-pressure heater 12 and the entrance of booster pump 13 are by the 5th
Valve is connected, and the outlet of N level low-pressure heater 12 is by the 6th valve and gas cooler 3
Hot water outlet be connected, the outfan of three-temperature sensor and the input phase of the 3rd controller
Connecting, the outfan of the 3rd controller and the control end of the 6th valve are connected.
With reference to Fig. 2 and Fig. 3, it should be noted that the soot blower on gas cooler 3 is sound wave
Soot blower 4, the soot blower on smoke re-heater 8 is steam sootblower 9；Gas cooler 3 includes
There is the first header the 14, second header 15 and some first heat-exchanger rigs, the first header 14 cold
But water inlet is connected by the coolant outlet of booster pump 13 with smoke re-heater 8, the first heat exchange
Device includes the 3rd header the 17, first heating surface 16 and the 4th header 18, entering of the 3rd header 17
The mouth of a river is connected with the outlet of the first header 14, and the outlet of the 3rd header 17 and first is heated
In face 16, the water inlet of heat exchanger tube is connected, the outlet and of heat exchanger tube in the first heating surface 16
The water inlet of four headers 18 is connected, the outlet of the 4th header 18 and the second header 15 enter water
Mouth is connected, and the hot water inlet of the outlet smoke re-heater 8 of the second header 15 is connected, air
The exhanst gas outlet of preheater 2 is connected with the smoke inlet of each first heating surface 16, and each first is heated
Exhanst gas outlet on face 16 is connected with the smoke inlet of electrostatic precipitator 5；Smoke re-heater 8
All wrap including the first heat-exchange system and the second heat-exchange system, the first heat-exchange system and the second heat-exchange system
Including the 5th header the 19, the 6th header 20 and some second heat-exchanger rigs, the second heat-exchanger rig includes
7th header the 22, the 8th header 23 and the second heating surface 21, the water inlet of the 7th header 22 and
The outlet of five headers 19 is connected, and changes in the outlet of the 7th header 22 and the second heating surface 21
The water inlet of heat pipe is connected, the outlet of heat-transfer surface and the 8th header 23 in the second heating surface 21
Water inlet be connected, the outlet of the 8th header 23 and the water inlet of the 6th header 20 are connected,
In first heat-exchange system, the water inlet of the 5th header 19 is connected with the hot water outlet of gas cooler 3
Logical, the 5th header in the outlet of the 6th header 20 and the second heat-exchange system in the first heat-exchange system
The water inlet of 19 is connected, and in the second heat-exchange system, the outlet of the 6th header 20 cools down with flue gas
The cooling water inlet of device 3 is connected, desulfurization fume outlet and each second heating surface 21 of desulfurizing tower 7
On smoke inlet be connected, the flue gas of the exhanst gas outlet on each second heating surface 21 and chimney 10
Entrance is connected, and in described gas cooler 3, the first heat is changed intrasystem first heating surface 16 and passed through
ND is made, and the first heating surface 16 uses H type finned tube in-line counter-flow arrangement smoke re-heater
In 8, the first heat changes intrasystem second heating surface 21 by plastic steel or two phase stainless steel making
Becoming, the second heating surface 21 uses light pipe stagger arrangement counter-flow arrangement；Second heat exchange system in smoke re-heater 8
The second heating surface 21 in system is made by 316L steel；Second heating surface 21 uses H type
Finned tube in-line counter-flow arrangement.
The operation principle of the present invention is:
Along flow of flue gas direction, flue gas by the exhanst gas outlet of boiler 1 through air preheater 2 shape
Become pre-heat smoke and send in gas cooler 3, the temperature of pre-heat smoke in gas cooler 3
Degree is lowered to acid dew point cooled flue gas formed below, and the sulfuric acid vapor condensation in cooled flue gas becomes
Acid mist, condenses on grey particle, reduces the fly ash resistivity in flue gas, also reduces cigarette simultaneously
Throughput, then cooled flue gas is sent into electrostatic precipitator 5 dedusting, make three oxidations in cooled flue gas
Sulfur content and dust burdening are substantially reduced, and form dedusting flue gas, are sent into by this dedusting flue gas subsequently and draw
In blower fan 6, and forming tail flue gas in air-introduced machine 6, tail flue gas is through desulfurizing tower 7 desulfurization shape
Becoming desulfurization fume, desulfurization fume temperature now is about 50 DEG C, containing saturated steam, corrosivity
Extremely strong, this desulfurization fume is sent in smoke re-heater 8, can be heated to about 80 DEG C, is formed again
Heat smoke drains into air by chimney 10 then, greatly reduces the flue gas corrosivity to chimney 10.
The cooling water of booster pump 13 output is heated as about 110 DEG C after gas cooler 3
Hot water, hot water enters the cooling water being cooled to about 70 DEG C after smoke re-heater 8, then
Enter booster pump 13 and complete circulation.
Utilize gas cooler 3 that preheating flue-gas temperature is reduced to below acid dew point so that in flue gas
Sulfuric acid vapor become acid mist, condense on flying dust, reduce flying dust ratio resistance, reduce flue gas stream
Speed, improves the efficiency of dust collection of electrostatic precipitator 5, is allowed to meet stricter environmental requirement, with
Time flying dust adsorb substantial amounts of SO3, the system that substantially increases is to SO3Removal efficiency, can effectively subtract
The corrosion of slow upstream device.Gas cooler 3 reduces the temperature of pre-heat smoke so that air-introduced machine
6 exhaust gas volumns processed are greatly reduced, and save power consumption.The temperature of the most pre-heat smoke reduces so that
In desulfurizing tower 7, water consumption is substantially reduced, and has saved the water resource of preciousness, has saved the spending of power plant.
Mellow lime point of content height of pre-heat smoke, and temperature is less than acid dew point, is susceptible to dust stratification and corrosion, because of
This gas cooler 3 use anti-dust stratification and corrosive power strong ND steel H type finned tube in-line adverse current
Arranging, cooling water is heated to about 110 DEG C by the fume afterheat that gas cooler 3 is absorbed, logical
The desulfurization fume crossing about 50 DEG C that desulfurizing tower 7 can be exported by smoke re-heater 8 is heated to 80 DEG C
The heat smoke again of left and right, greatly reduces the flue gas corrosivity to chimney 10, smoke re-heater 8
The desulfurization fume of smoke inlet belongs to the flue gas of severe corrosive, and smoke re-heater 8 includes the first heat exchange
System and the second heat-exchange system, the first heat changes intrasystem second heating surface 21 by plastic steel or double
Phase rustless steel is made, and uses light pipe stagger arrangement counter-flow arrangement, flue-gas temperature is increased to 65 DEG C of left sides
The right side, alleviates the corrosive power of flue gas, and the second heating surface 21 in the second heat-exchange system passes through 316L
Steel is made, and uses H type finned tube in-line counter-flow arrangement, continues to be heated to flue-gas temperature
About 80 DEG C, the heating surface of gas cooler 3 and smoke re-heater 8 all uses modularized design,
Hot water is here divided evenly over after entering the first header 14 in each 3rd header 17, subsequently into phase
The first heating surface 16 answered, if certain root pipe leaks, can directly close the 3rd header of its correspondence
17 and first heating surface 16, it is to avoid close whole first heating surface 16, improve the profit of heat exchanger
By rate, and this is designed with and beneficially installs and transport.
N level low-pressure heater 12 entrance is connected with the entrance of booster pump 13, owing to N level is low
Pressure heater 12 entrance condensation water pressure ensured by the heat regenerative system of whole power plant, therefore for
For native system, the effect of voltage stabilizing can be played, greatly strengthen the reliability of system, and be
System initial operating stage can directly entrance from N level low-pressure heater 12 be rinsed and water filling, saves
Save the cleaning procedure in legacy system and for the water tank of voltage stabilizing, small pump etc., saved and be
The spending of system.
Second temperature sensor detects the temperature information of the flue gas of air preheater 2 output in real time, so
After described temperature information is forwarded in second controller, when described air preheater 2 output cigarette
When the temperature of gas is less than pre-set threshold value, second controller controls the second valve and opens, it is to avoid too much
Cooling water enters gas cooler 3 so that flue-gas temperature is too low, and follow-up equipment is produced corrosion.
First temperature sensor detects gas cooler 3 in real time and exports the temperature of hot water, and will detection
Result be input in the first controller, when gas cooler 3 exports the temperature of hot water less than presetting
During threshold values, second controller controls the first valve closing, the second valve and the 3rd valve and opens, and
Control steam heater 11 normally to work,
Three-temperature sensor detects the temperature of the hot water of gas cooler 3 output in real time, and will inspection
The result surveyed is input in the 3rd controller, when the temperature of the hot water of gas cooler 3 output is more than
During pre-set threshold value, the 3rd controller controls the 6th valve and opens.Make too much heat recovery to N level
The outlet of low-pressure heater 12, now can squeeze drawing gas of N level low-pressure heater 12, reduces
Coal consumption.Owing to smoke re-heater 8 is among the flue gas of severe corrosive, work under bad environment, ten thousand
When one occurrence of large-area leaks and has to all isolate it, the system of the present invention can be converted to
The fume afterheat that low-level (stack-gas) economizer system, i.e. gas cooler 3 reclaim is all for adding Hot gas turbine
The condensation water that heat regenerative system is come, drawing gas of exclusion N level low-pressure heater 12, increase steam turbine and do
Merit power, improves unit efficiency, saves coal consumption, reduces pollutant emission.Therefore this device is overall
Having investment little, simple in construction, effect is obvious, and the feature that operational reliability is high completes energy-conservation increasing
Effect, Improvement of dust removal, desulfurization water saving, slow down chimney 10 and corrode and improve pollutant diffusivity, real
The energy-saving and emission-reduction of existing comprehensive control integration.
Claims (5)
1. based on flue gas waste heat recovery and a boiler energy-saving emission-reduction system for thermal technology again, its feature
It is, including air preheater (2), gas cooler (3), electrostatic precipitator (5), desulfurizing tower
(7), smoke re-heater (8) and chimney (10), the smoke inlet of air preheater (2) and pot
The exhanst gas outlet of stove (1) is connected, the exhanst gas outlet of air preheater (2) and gas cooler (3)
Smoke inlet be connected, the cigarette of the exhanst gas outlet of gas cooler (3) and electrostatic precipitator (5)
Gas entrance is connected, and the exhanst gas outlet of electrostatic precipitator (5) enters with the tail flue gas of desulfurizing tower (7)
Mouth is connected, the desulfurization fume outlet of desulfurizing tower (7) and the smoke inlet phase of smoke re-heater (8)
Connection, the reheating exhanst gas outlet of smoke re-heater (8) is connected with the smoke inlet of chimney (10),
The hot water outlet of gas cooler (3) is connected with the hot water inlet of smoke re-heater (8), flue gas
The cooling water outlet of reheater (8) is by the cold water inlet of booster pump (13) with gas cooler (3)
It is connected；
Also include steam heater (11), the first controller and be used for detecting gas cooler (3)
First temperature sensor of the temperature of output hot water, the hot water outlet of gas cooler (3) and flue gas
It is connected by the first valve between the hot water inlet of reheater (8), steam heater (11)
It is connected by the second valve between the entrance of entrance and the first valve, going out of steam heater (11)
It is connected by the 3rd valve between mouth and the outlet of the first valve, the outfan of the first temperature sensor
It is connected with the input of the first controller, the outfan of the first controller and the control of the first valve
End, the control end controlling end and the 3rd valve of the second valve are connected；
Also include second controller, the 4th valve and export for detecting gas cooler (3)
Second temperature sensor of temperature of flue gas, hot water outlet and the cold water of gas cooler (3) enter
Mouth is connected by the 4th valve, the outfan of the second temperature sensor and the input of second controller
Being connected, the outfan of second controller and the control end of the 4th valve are connected；
Also include N level low-pressure heater (12), three-temperature sensor, the 3rd controller, the 5th
Valve, the 6th valve and be used for detecting the 3rd of the temperature of the hot water that gas cooler (3) exports
Temperature sensor, the entrance of the entrance of N level low-pressure heater (12) and booster pump (13) is by the
Five valves are connected, and the outlet of N level low-pressure heater (12) is by the 6th valve and gas cooler
(3) hot water outlet is connected, the outfan of three-temperature sensor and the input of the 3rd controller
End is connected, and the outfan of the 3rd controller and the control end of the 6th valve are connected；
Described gas cooler (3) include the first header (14), the second header (15) and if
Dry first heat-exchanger rig, booster pump (13) and flue gas are passed through in the cooling water inlet of the first header (14)
The coolant outlet of reheater (8) is connected, the first heat-exchanger rig include the 3rd header (17),
One heating surface (16) and the 4th header (18), the water inlet of the 3rd header (17) and the first header
(14) outlet is connected, in the outlet of the 3rd header (17) and the first heating surface (16)
The water inlet of heat exchanger tube is connected, the outlet of the first heating surface (16) interior heat exchanger tube and the 4th header
(18) water inlet is connected, the 4th outlet of header (18) and entering of the second header (15)
The mouth of a river is connected, and the hot water inlet of the outlet smoke re-heater (8) of the second header (15) is connected
Logical, the exhanst gas outlet of air preheater (2) is connected with the smoke inlet of each first heating surface (16)
Logical, the smoke inlet phase of the exhanst gas outlet on each first heating surface (16) and electrostatic precipitator (5)
Connection.
The most according to claim 1 based on flue gas waste heat recovery and the boiler energy-saving of thermal technology again
Emission-reducing system, it is characterised in that the exhanst gas outlet of described electrostatic precipitator (5) and desulfurizing tower (7)
Tail flue gas entrance between be connected by air-introduced machine (6).
The most according to claim 1 based on flue gas waste heat recovery and the boiler energy-saving of thermal technology again
Emission-reducing system, it is characterised in that the soot blower on gas cooler (3) is acoustic wave ash ejector (4),
Soot blower on smoke re-heater (8) is steam sootblower (9).
The most according to claim 1 based on flue gas waste heat recovery and the boiler energy-saving of thermal technology again
Emission-reducing system, it is characterised in that described smoke re-heater (8) includes the first heat-exchange system and second
Heat-exchange system, the first heat-exchange system and the second heat-exchange system all include the 5th header (19), the 6th
Case (20) and some second heat-exchanger rigs, the second heat-exchanger rig include the 7th header (22), the 8th
Header (23) and the second heating surface (21), the water inlet of the 7th header (22) and the 5th header (19)
Outlet be connected, the outlet of the 7th header (22) and the second heating surface (21) interior heat exchanger tube
Water inlet be connected, the outlet of the second heating surface (21) interior heat-transfer surface and the 8th header (23)
Water inlet be connected, the outlet of the 8th header (23) and the water inlet phase of the 6th header (20)
Connection, the water inlet of the 5th header (19) and the heat of gas cooler (3) in the first heat-exchange system
Water out is connected, the outlet of the 6th header (20) and the second heat-exchange system in the first heat-exchange system
In the water inlet of the 5th header (19) be connected, in the second heat-exchange system, the 6th header (20) goes out
The mouth of a river is connected with the cooling water inlet of gas cooler (3), and the desulfurization fume of desulfurizing tower (7) goes out
Mouth is connected with the smoke inlet on each second heating surface (21), on each second heating surface (21)
Exhanst gas outlet is connected with the smoke inlet of chimney (10).
The most according to claim 4 based on flue gas waste heat recovery and the boiler energy-saving of thermal technology again
Emission-reducing system, it is characterised in that
In described gas cooler (3), the first heat is changed intrasystem first heating surface (16) and is passed through ND
Being made, the first heating surface (16) uses H type finned tube in-line counter-flow arrangement；
In described smoke re-heater (8), the first heat changes intrasystem second heating surface (21) by bag
Plastic-steel or two phase stainless steel are made, and the second heating surface (21) uses light pipe stagger arrangement counter-flow arrangement；
In described smoke re-heater (8), the second heating surface (21) in the second heat-exchange system passes through 316L
Steel is made；Second heating surface (21) uses H type finned tube in-line counter-flow arrangement.
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| CN201410317045.1A CN104100994B (en) | 2014-07-04 | 2014-07-04 | A kind of based on flue gas waste heat recovery and the boiler energy-saving emission-reduction system of thermal technology again |
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| CN201410317045.1A CN104100994B (en) | 2014-07-04 | 2014-07-04 | A kind of based on flue gas waste heat recovery and the boiler energy-saving emission-reduction system of thermal technology again |
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| CN104100994B true CN104100994B (en) | 2016-08-10 |
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