CN104100994A - Boiler energy saving and emission reduction system based on flue gas waste heat recovery and reheating technology - Google Patents

Boiler energy saving and emission reduction system based on flue gas waste heat recovery and reheating technology Download PDF

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CN104100994A
CN104100994A CN201410317045.1A CN201410317045A CN104100994A CN 104100994 A CN104100994 A CN 104100994A CN 201410317045 A CN201410317045 A CN 201410317045A CN 104100994 A CN104100994 A CN 104100994A
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connected
flue gas
header
outlet
heater
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CN201410317045.1A
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CN104100994B (en
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贾兆鹏
张知翔
陆军
徐党旗
张广才
梁双轨
周飞
薛宁
李楠
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西安西热锅炉环保工程有限公司
西安热工研究院有限公司
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/30Technologies for a more efficient combustion or heat usage
    • Y02E20/34Indirect CO2 mitigation, i.e. by acting on non CO2 directly related matters of the process, e.g. more efficient use of fuels
    • Y02E20/348Air pre-heating

Abstract

The invention discloses a boiler energy saving and emission reduction system based on flue gas waste heat recovery and the reheating technology. The system comprises an air preheater, a flue gas cooler, an electrostatic dust collector, a desulfurizing tower, a flue gas reheater, and a chimney. A flue gas inlet of the air preheater is communicated with a flue gas outlet of a boiler. A flue gas outlet of the air preheater is communicated with a flue gas inlet of the flue gas cooler. A flue gas outlet of the flue gas cooler is communicated with a flue gas inlet of the electrostatic dust collector. A flue gas outlet of the electrostatic dust collector is communicated with a tail flue gas inlet of the desulfurizing tower. A desulfurized flue gas outlet of the desulfurizing tower is communicated with a flue gas inlet of the flue gas reheater. A reheated flue gas outlet of the flue gas reheater is communicated with a flue gas inlet of the chimney. A hot water outlet of the flue gas cooler is communicated with a hot water inlet of the flue gas reheater. A cold water outlet of the flue gas reheater is communicated with a cold water inlet of the flue gas cooler through a booster pump. The boiler energy saving and emission reduction system based on flue gas waste heat recovery and the reheating technology allows boiler flue gas to be treated and is long in service life, energy efficient and environment friendly.

Description

A kind of based on flue gas waste heat recovery and the boiler energy-saving emission-reduction system of thermal technology again

Technical field

The invention belongs to station boiler field, relate to a kind of energy-saving and emission-reduction system, be specifically related to a kind of based on flue gas waste heat recovery and the boiler energy-saving emission-reduction system of thermal technology again.

Background technology

Coal is the main primary energy of China, and coal fired power generation is occupied an leading position in power generation.This energy resource structure can not change within one quite long from now on period.Under, coal supply intense situation vigorous in current energy demand; develop efficient, energy-conservation, large capacity, clean environmental protection, generation technology that reliability is high; not only can meet national economy fast development to electric power in the urgent need to, and can tackle increasingly serious requirement and the challenge from environmental protection aspect.Along with the day by day raising of the whole world to environmental protection requirement, China is also more and more higher to the standard of environmental protection.Within 2011, country has promulgated new < < fossil-fuel power plant atmospheric pollutant emission standard > > (GB13223-2011), and enforcement in 2012.With respect to former standard, further improved the SO of thermal power plant 2, NO xand the discharge standard of flue dust, reach and be even better than international most advanced level.

Exhaust gas temperature is the important indicator of power plant's operation, and the higher efficiency that not only can greatly reduce boiler of exhaust gas temperature, also can have a negative impact to all devices of boiler back end ductwork.Exhaust gas temperature is mainly manifested in the following aspects to the impact of boiler safety, economy:

1) exhaust gas temperature raises, and exhaust gas volumn is increased, thereby reduces the ratio dust-collecting area of electric cleaner, shortens the time of staying of fly ash granule in electric precipitation, affects the sedimentation of flying dust, reduces the efficiency of electric cleaner.

2) exhaust gas temperature raises, and fly ash resistivity will rise to 10 11more than (Ω cm), fly ash resistivity enters in the scope that is not suitable for electric precipitation work, greatly reduces the efficiency of electric cleaner.

3) exhaust gas temperature raises, and blower fan, deduster working environment are worsened, and shortens the life-span of equipment, has increased accident rate, affects unit safety.

4), for wet desulfurization system, exhaust gas temperature is too high by the water consumption of desulphurization system is strengthened, and wastes precious water resource.

5) flue gas after wet desulphurization is saturated flue gas, and the water vapour content in flue gas increases greatly, and the operating condition of chimney will sharply worsen, and corrosion aggravation, affects unit safety.

Thermal power plant consumes 50% of coal in China total output, and its heat loss due to exhaust gas is one maximum in station boiler various heat losses, generally 5%~8%, and 15 ℃ of the every risings of exhaust gas temperature, heat loss due to exhaust gas increases by 0.6%~1.0%.In China's active service fired power generating unit, exhaust gas temperature generally maintains 125~150 ℃ of left and right horizontal, and high fume temperature is a universal phenomenon.

Flue-gas temperature after wet desulphurization is generally 50 ℃ of left and right, a small amount of SO in flue gas 3be combined with water vapour and generate H 2sO 4steam just can significantly improve flue gas dew point temperature, and the right removal efficiency of traditional desulphurization system is only 20%~30% left and right, and therefore the flue gas through wet desulphurization enters after chimney, H 2sO 4condense, will chimney be produced to stronger corrosion.Flue gas after desulfurization carries saturated steam, the SO in flue gas 2, Cl 2, fluorochemical, NO 2deng being combined and producing respectively H with steam 2sO 3, HCl, HF, HNO 2deng, a little higher than water dew point of dew-point temperature of these acid vapors, therefore when saturated wet flue gas enters after chimney, these acid will be condensed in a large number, and chimney is produced to strong corrosion.Can find out that the corrosion that will effectively slow down chimney need to take two measures, one is greatly to improve SO 3removal efficiency, make the SO in flue gas 3content, close to 0, is contained H 2sO 4corrosion, another measure is to improve the flue-gas temperature enter chimney, stops H 2sO 3, HCl, HF, HNO 2deng corrosion.

The diffusivity of pollutant is directly proportional to the rising height of flue gas, and atmosphere hoist height depends primarily on the poor of exit gas temperature and environment temperature.Therefore, the height of exhaust gas temperature plays an important role to the diffusivity of flue gas pollutant.When exhaust gas temperature is lower, the rising height of flue gas also decreases, and diffusivity is poor, and the flooring concentration of near power station pollutant will increase.And the flue gas of discharging from chimney after desulfurization is in saturation state, and the steam that condenses when environment temperature is lower can form white plume.Although it is due to the vaporization of flue gas water vapour after desulfurization that chimney of electric plant emits " white cigarette " phenomenon, harmless, due to the refraction action of light, particularly in the winter time, makes flue gas seem denseer, easily causes visual pollution, causes popular Psychological phobia.

Summary of the invention

The object of the invention is to overcome the shortcoming of above-mentioned prior art, provide a kind of based on flue gas waste heat recovery and the boiler energy-saving emission-reduction system of thermal technology again, the flue gas that this system can be effectively produces boiler be processed, and long service life, energy-conserving and environment-protective.

For achieving the above object, of the present invention based on flue gas waste heat recovery and again the boiler energy-saving emission-reduction system of thermal technology comprise 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 hot exhanst gas outlet again 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.

Between the tail flue gas entrance of the exhanst gas outlet of described electrostatic precipitator and desulfurizing tower, by air-introduced machine, be connected.

Also comprise steam heater, the first controller and the first temperature sensor of exporting the temperature of hot water for detection of gas cooler, between the hot water outlet of gas cooler and the hot water inlet of smoke re-heater, by the first valve, be connected, between the entrance of the entrance of steam heater and the first valve, by the second valve, be connected, between the outlet of the outlet of steam heater and the first valve, by the 3rd valve, be connected, the output of the first temperature sensor is connected with the input of the first controller, the control end of the output of the first controller and the first valve, the control end of the control end of the second valve and the 3rd valve is connected.

The second temperature sensor of the temperature of the flue gas that also comprises second controller, the 4th valve and export for detection of gas cooler, the hot water outlet of gas cooler and cold water inlet are connected by the 4th valve, the output of the second temperature sensor is connected with the input of second controller, and the output of second controller is connected with the control end of the 4th valve.

The three-temperature sensor of the temperature of the hot water that also comprises N level low-pressure heater, three-temperature sensor, the 3rd controller, the 5th valve, the 6th valve and export for detection of gas cooler, the entrance of N level low-pressure heater is connected by the 5th valve with the entrance of booster pump, the outlet of N level low-pressure heater is connected with the hot water outlet of gas cooler by the 6th valve, the output of three-temperature sensor is connected with the input of the 3rd controller, and the output of the 3rd controller 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 steam sootblower.

Described gas cooler includes the first header, the second header and some the 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, the first heat-exchanger rig comprises the 3rd header, the first heating surface and tetrad case, the water inlet of the 3rd header is connected with the delivery port of the first header, the delivery port of the 3rd header is connected with the water inlet of heat exchanger tube in the first heating surface, in the first heating surface, the delivery port of heat exchanger tube is connected with the water inlet of tetrad case, the delivery port of tetrad case is connected with the water inlet of the second header, the hot water inlet of the delivery port smoke re-heater of the second header is connected, the exhanst gas outlet of air preheater is connected with the smoke inlet of each the first heating surface, exhanst gas outlet on each first heating surface is connected with the smoke inlet of electrostatic precipitator.

Described smoke re-heater comprises the first heat-exchange system and the second heat-exchange system, the first heat-exchange system and the second heat-exchange system include 5-linked case, the 6th header and some the second heat-exchanger rigs, the second heat-exchanger rig comprises the 7th header, the 8th header and the second heating surface, the water inlet of the 7th header is connected with the delivery port of 5-linked case, the delivery port of the 7th header is connected with the water inlet of heat exchanger tube in the second heating surface, in the second heating surface, the delivery port of heat-transfer surface is connected with the water inlet of the 8th header, the delivery port of the 8th header is connected with the water inlet of the 6th header, in the first heat-exchange system, the water inlet of 5-linked case and the hot water outlet of gas cooler are connected, in the first heat-exchange system, the delivery port of the 6th header is connected with the water inlet of 5-linked case in the second heat-exchange system, in the second heat-exchange system, the 6th delivery port of header and the cooling water inlet of gas cooler are connected, the desulfurization fume outlet of desulfurizing tower is connected with the smoke inlet on each second heating surface, exhanst gas outlet on each second heating surface is connected with the smoke inlet of chimney.

In described gas cooler, the first heat is changed intrasystem the first heating surface and is made by ND, and the first heating surface adopts H type finned tube along row counter-flow arrangement.

In described smoke re-heater, the first heat is changed intrasystem the second heating surface and is made by plastic steel or two phase stainless steel, and the second heating surface adopts light pipe stagger arrangement counter-flow arrangement;

The second heating surface in described smoke re-heater in the second heat-exchange system is made by 316L steel; The second heating surface adopts H type finned tube along row counter-flow arrangement.

The present invention has following beneficial effect:

Of the present invention based on flue gas waste heat recovery and again the boiler energy-saving emission-reduction system of thermal technology in the process that boiler smoke is processed, the flue gas first by air preheater, boiler being produced is processed, form preheating flue gas, preheating flue gas is through the cooling formation cooled flue gas of gas cooler, make the sulfuric acid vapor in flue gas be condensed into acid mist, and condense on the soot particle in flue gas, thereby 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, forming hot flue gas discharges by chimney again, effectively reduce the corrosivity of flue gas to chimney, improve the rising height of flue gas and the diffusivity of pollutant.

Accompanying drawing explanation

Fig. 1 is 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 is that boiler, 2 is that air preheater, 3 is that gas cooler, 4 is that acoustic wave ash ejector, 5 is that electrostatic precipitator, 6 is that air-introduced machine, 7 is that desulfurizing tower, 8 is that smoke re-heater, 9 is that steam sootblower, 10 is that chimney, 11 is that steam heater, 12 is that N level low-pressure heater, 13 is that booster pump, 14 is that the first header, 15 is that the second header, 16 is that the first heating surface, 17 is that the 3rd header, 18 is that tetrad case, 19 is that 5-linked case, 20 is that the 6th header, 21 is that the second heating surface, 22 is that the 7th header, 23 is the 8th header.

The specific embodiment

Below in conjunction with accompanying drawing, the present invention is described in further detail:

With reference to figure 1, of the present invention based on flue gas waste heat recovery and again the boiler energy-saving emission-reduction system of thermal technology comprise 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 is connected with the exhanst gas outlet of boiler 1, 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, the exhanst gas outlet of electrostatic precipitator 5 is connected with the tail flue gas entrance of desulfurizing tower 7, the desulfurization fume outlet of desulfurizing tower 7 is connected with the smoke inlet of smoke re-heater 8, the hot exhanst gas outlet again 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, the cooling water outlet of smoke re-heater 8 is connected with the cold water inlet of gas cooler 3 by booster pump 13, between the tail flue gas entrance of the exhanst gas outlet of electrostatic precipitator 5 and desulfurizing tower 7, by air-introduced machine 6, be connected.

The present invention also comprises steam heater 11, the first controller and the first temperature sensor of exporting the temperature of hot water for detection of gas cooler 3, between the hot water inlet of the hot water outlet of gas cooler 3 and smoke re-heater 8, by the first valve, be connected, between the entrance of the entrance of steam heater 11 and the first valve, by the second valve, be connected, between the outlet of the outlet of steam heater 11 and the first valve, by the 3rd valve, be connected, the output of the first temperature sensor is connected with the input of the first controller, the control end of the output of the first controller and the first valve, the control end of the control end of the second valve and the 3rd valve is connected.

The present invention also comprises second controller, the 4th valve and for detection of the second temperature sensor of the temperature of the flue gas of gas cooler 3 outputs, the hot water outlet of gas cooler 3 and cold water inlet are connected by the 4th valve, the output of the second temperature sensor is connected with the input of second controller, and the output of second controller is connected with the control end of the 4th valve.

The present invention also comprises N level low-pressure heater 12, three-temperature sensor, the 3rd controller, the 5th valve, the 6th valve and for detection of the three-temperature sensor of the temperature of the hot water of gas cooler 3 outputs, the entrance of N level low-pressure heater 12 is connected by the 5th valve with the entrance of booster pump 13, the outlet of N level low-pressure heater 12 is connected with the hot water outlet of gas cooler 3 by the 6th valve, the output of three-temperature sensor is connected with the input of the 3rd controller, and the output of the 3rd controller is connected with the control end of the 6th valve.

With reference to figure 2 and Fig. 3, it should be noted that, the soot blower on gas cooler 3 is acoustic wave ash ejector 4, the soot blower on smoke re-heater 8 is steam sootblower 9, gas cooler 3 includes the first header 14, the second header 15 and some the first heat-exchanger rigs, the cooling water inlet of the first header 14 is connected with the coolant outlet of smoke re-heater 8 by booster pump 13, the first heat-exchanger rig comprises the 3rd header 17, the first heating surface 16 and tetrad case 18, the water inlet of the 3rd header 17 is connected with the delivery port of the first header 14, the delivery port of the 3rd header 17 is connected with the water inlet of the first heating surface 16 interior heat exchanger tubes, the delivery port of the first heating surface 16 interior heat exchanger tubes is connected with the water inlet of tetrad case 18, the delivery port of tetrad case 18 is connected with the water inlet of the second header 15, the hot water inlet of the delivery port smoke re-heater 8 of the second header 15 is connected, the exhanst gas outlet of air preheater 2 is connected with the smoke inlet of each the first heating surface 16, exhanst gas outlet on each first heating surface 16 is connected with the smoke inlet of electrostatic precipitator 5, smoke re-heater 8 comprises the first heat-exchange system and the second heat-exchange system, the first heat-exchange system and the second heat-exchange system include 5-linked case 19, the 6th header 20 and some the second heat-exchanger rigs, the second heat-exchanger rig comprises the 7th header 22, the 8th header 23 and the second heating surface 21, the water inlet of the 7th header 22 is connected with the delivery port of 5-linked case 19, the delivery port of the 7th header 22 is connected with the water inlet of the second heating surface 21 interior heat exchanger tubes, the delivery port of the second heating surface 21 interior heat-transfer surfaces is connected with the water inlet of the 8th header 23, the delivery port of the 8th header 23 is connected with the water inlet of the 6th header 20, in the first heat-exchange system, the water inlet of 5-linked case 19 is connected with the hot water outlet of gas cooler 3, in the first heat-exchange system, the delivery port of the 6th header 20 is connected with the water inlet of 5-linked case 19 in the second heat-exchange system, in the second heat-exchange system, the delivery port of the 6th header 20 is connected with the cooling water inlet of gas cooler 3, the desulfurization fume outlet of desulfurizing tower 7 is connected with the smoke inlet on each second heating surface 21, exhanst gas outlet on each second heating surface 21 is connected with the smoke inlet of chimney 10, in described gas cooler 3, the first heat is changed intrasystem the first heating surface 16 and is made by ND, the first heating surface 16 adopts H type finned tube to change intrasystem the second heating surface 21 along the first heat in row counter-flow arrangement smoke re-heater 8 and is made by plastic steel or two phase stainless steel, the second heating surface 21 adopts light pipe stagger arrangement counter-flow arrangement, the second heating surface 21 in smoke re-heater 8 in the second heat-exchange system is made by 316L steel, the second heating surface 21 adopts H type finned tube along row counter-flow arrangement.

Operation principle of the present invention is:

Along flow of flue gas direction, the preheating flue gas that flue gas is formed through air preheater 2 by the exhanst gas outlet of boiler 1 is also sent in gas cooler 3, in gas cooler 3, the temperature of preheating flue gas is lowered to and below acid dew point, forms cooled flue gas, sulfuric acid vapor condensation in cooled flue gas becomes acid mist, condense on grey particle, reduced the fly ash resistivity in flue gas, also reduced flue gas flow simultaneously, again cooled flue gas is sent into electrostatic precipitator 5 dedustings, sulfur trioxide content and dust burdening in cooled flue gas are reduced greatly, and form dedusting flue gas, subsequently this dedusting flue gas is sent in air-introduced machine 6, and form tail flue gas in air-introduced machine 6, tail flue gas forms desulfurization fume through desulfurizing tower 7 desulfurization, desulfurization fume temperature is now 50 ℃ of left and right, containing saturated steam, corrosivity is extremely strong, this desulfurization fume is sent in smoke re-heater 8, can be heated to 80 ℃ of left and right, form again hot flue gas and then by chimney 10, drain into atmosphere, greatly reduce the corrosivity of flue gas to chimney 10.

The cooling water of booster pump 13 output is heated as the hot water of 110 ℃ of left and right after gas cooler 3, and hot water enters and is cooled into after smoke re-heater 8 is the cooling water of 70 ℃ of left and right, then enters booster pump 13 and completes circulation.

Utilize gas cooler 3 that preheating flue-gas temperature is reduced to below acid dew point, make the sulfuric acid vapor in flue gas become acid mist, condense on flying dust, reduce the ratio resistance of flying dust, reduce flue gas flow rate, improve the efficiency of dust collection of electrostatic precipitator 5, make it to meet stricter environmental requirement, flying dust adsorbs a large amount of SO simultaneously 3, greatly improved system to SO 3removal efficiency, can effectively slow down the corrosion of upstream device.Gas cooler 3 has reduced the temperature of preheating flue gas, and the exhaust gas volumn that air-introduced machine 6 is processed reduces greatly, saves power consumption.The temperature of the flue gas of preheating simultaneously reduces, and water consumption in desulfurizing tower 7 is reduced greatly, has saved precious water resource, has saved the spending of power plant.In preheating flue gas, content of ashes is high, and temperature is lower than acid dew point, easily there is dust stratification and corrosion, therefore the ND steel H type finned tube that the gas cooler 3 anti-dust stratifications of employing and corrosive power are strong is along row counter-flow arrangement, the fume afterheat that gas cooler 3 absorbs is heated to 110 ℃ of left and right by cooling water, by smoke re-heater 8, the desulfurization fume of 50 ℃ of left and right of desulfurizing tower 7 outlets can be heated to the hot flue gas again of 80 ℃ of left and right, greatly reduce the corrosivity of flue gas to chimney 10, the desulfurization fume of smoke re-heater 8 smoke inlets belongs to the flue gas of severe corrosive, smoke re-heater 8 comprises the first heat-exchange system and the second heat-exchange system, the first heat is changed intrasystem the second heating surface 21 and is made by plastic steel or two phase stainless steel, adopt light pipe stagger arrangement counter-flow arrangement, flue-gas temperature is increased to 65 ℃ of left and right, alleviated the corrosive power of flue gas, the second heating surface 21 in the second heat-exchange system is made by 316L steel, adopt H type finned tube along row counter-flow arrangement, continuation is heated to 80 ℃ of left and right by flue-gas temperature, the heating surface of gas cooler 3 and smoke re-heater 8 all adopts modularized design, hot water enters the rear quilt of the first header 14 and is assigned to uniformly in each the 3rd header 17, then enter corresponding the first heating surface 16, if certain root pipe leaks, can directly close the 3rd header 17 and first heating surface 16 of its correspondence, avoid closing whole the first heating surface 16, improved the utilization rate of heat exchanger, and this is designed with to be beneficial to and installs and transportation.

N level low-pressure heater 12 entrances are connected with the entrance of booster pump 13, because the condensate water pressure of the N level low-pressure heater 12 entrances heat regenerative system by whole power plant guarantees, therefore for native system, can play the effect of voltage stabilizing, greatly strengthened the reliability of system, and can directly from the entrance of N level low-pressure heater 12, rinse and water filling at system initial operating stage, save cleaning procedure in legacy system and for the water tank of voltage stabilizing, small pump etc., saved the spending of system.

The second temperature sensor detects the temperature information of the flue gas of air preheater 2 outputs in real time, then described temperature information is forwarded in second controller, when the temperature of the flue gas of described air preheater 2 outputs is during lower than pre-set threshold value, second controller is controlled the second valve open, avoid too much cooling water to enter gas cooler 3, make flue-gas temperature too low, follow-up equipment is produced to corrosion.

The first temperature sensor detects the temperature of gas cooler 3 output hot water in real time, and the result of detection is input in the first controller, when the temperature of gas cooler 3 output hot water is during lower than pre-set threshold value, second controller is controlled the first valve closing, the second valve and the 3rd valve open, and control steam heater 11 and normally work

Three-temperature sensor detects the temperature of the hot water of gas cooler 3 output in real time, and the result of detection is input in the 3rd controller, and when the temperature of the hot water of gas cooler 3 outputs is greater than pre-set threshold value, the 3rd controller is controlled the 6th valve open.Make too much heat recovery to the outlet of N level low-pressure heater 12, now can squeeze drawing gas of N level low-pressure heater 12, reduce coal consumption.Among the flue gas of smoke re-heater 8 in severe corrosive, work under bad environment, while having to it all to isolate just in case occurrence of large-area is leaked, system of the present invention can be converted to low-level (stack-gas) economizer system, and the fume afterheat that gas cooler 3 reclaims is all used for heating the condensate water that Steam Turbine Regenerative System is come, and squeezes drawing gas of N level low-pressure heater 12, increase steam turbine working power, improve unit efficiency, save coal consumption, reduce pollutant emission.Therefore it is little, simple in structure that this device totally has investment, successful, the feature that operational reliability is high, complete energy efficiency, Improvement of dust removal, desulfurization water saving, slow down chimney 10 corrosion and improve Pollutants Diffusion ability, realize the integrated energy-saving and emission-reduction of the comprehensive regulation.

Claims (9)

1. one kind based on flue gas waste heat recovery and the boiler energy-saving emission-reduction system of thermal technology again, it is characterized in that, comprise 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) is connected with the exhanst gas outlet of boiler (1), 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), the exhanst gas outlet of electrostatic precipitator (5) is connected with the tail flue gas entrance of desulfurizing tower (7), the desulfurization fume outlet of desulfurizing tower (7) is connected with the smoke inlet of smoke re-heater (8), the hot exhanst gas outlet again 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), the cooling water outlet of smoke re-heater (8) is connected with the cold water inlet of gas cooler (3) by booster pump (13).
2. according to claim 1 based on flue gas waste heat recovery and the boiler energy-saving emission-reduction system of thermal technology again, it is characterized in that, between the tail flue gas entrance of the exhanst gas outlet of described electrostatic precipitator (5) and desulfurizing tower (7), by air-introduced machine (6), be connected.
3. according to claim 1 based on flue gas waste heat recovery and the boiler energy-saving emission-reduction system of thermal technology again, it is characterized in that, also comprise steam heater (11), the first controller and the first temperature sensor of exporting the temperature of hot water for detection of gas cooler (3), between the hot water outlet of gas cooler (3) and the hot water inlet of smoke re-heater (8), by the first valve, be connected, between the entrance of steam heater (11) and the entrance of the first valve, by the second valve, be connected, between the outlet of steam heater (11) and the outlet of the first valve, by the 3rd valve, be connected, the output of the first temperature sensor is connected with the input of the first controller, the control end of the output of the first controller and the first valve, the control end of the control end of the second valve and the 3rd valve is connected.
4. according to claim 3 based on flue gas waste heat recovery and the boiler energy-saving emission-reduction system of thermal technology again, it is characterized in that, the second temperature sensor of the temperature of the flue gas that also comprises second controller, the 4th valve and export for detection of gas cooler (3), the hot water outlet of gas cooler (3) and cold water inlet are connected by the 4th valve, the output of the second temperature sensor is connected with the input of second controller, and the output of second controller is connected with the control end of the 4th valve.
5. according to claim 4 based on flue gas waste heat recovery and the boiler energy-saving emission-reduction system of thermal technology again, it is characterized in that, also comprise N level low-pressure heater (12), three-temperature sensor, the 3rd controller, the 5th valve, the 6th valve and for detection of the three-temperature sensor of the temperature of the hot water of gas cooler (3) output, the entrance of N level low-pressure heater (12) is connected by the 5th valve with the entrance of booster pump (13), the outlet of N level low-pressure heater (12) is connected with the hot water outlet of gas cooler (3) by the 6th valve, the output of three-temperature sensor is connected with the input of the 3rd controller, the output of the 3rd controller is connected with the control end of the 6th valve.
6. according to claim 1 based on flue gas waste heat recovery and the boiler energy-saving emission-reduction system of thermal technology again, it is characterized in that, soot blower on gas cooler (3) is acoustic wave ash ejector (4), and the soot blower on smoke re-heater (8) is steam sootblower (9).
7. according to claim 1 based on flue gas waste heat recovery and the boiler energy-saving emission-reduction system of thermal technology again, it is characterized in that, described gas cooler (3) includes the first header (14), the second header (15) and some the first heat-exchanger rigs, the cooling water inlet of the first header (14) is connected with the coolant outlet of smoke re-heater (8) by booster pump (13), the first heat-exchanger rig comprises the 3rd header (17), the first heating surface (16) and tetrad case (18), the water inlet of the 3rd header (17) is connected with the delivery port of the first header (14), the delivery port of the 3rd header (17) is connected with the water inlet of the interior heat exchanger tube of the first heating surface (16), the delivery port of the interior heat exchanger tube of the first heating surface (16) is connected with the water inlet of tetrad case (18), the delivery port of tetrad case (18) is connected with the water inlet of the second header (15), the hot water inlet of the delivery port smoke re-heater (8) of the second header (15) is connected, the exhanst gas outlet of air preheater (2) is connected with the smoke inlet of each the first heating surface (16), exhanst gas outlet on each first heating surface (16) is connected with the smoke inlet of electrostatic precipitator (5).
8. according to claim 7 based on flue gas waste heat recovery and the boiler energy-saving emission-reduction system of thermal technology again, it is characterized in that, described smoke re-heater (8) comprises the first heat-exchange system and the second heat-exchange system, the first heat-exchange system and the second heat-exchange system include 5-linked case (19), the 6th header (20) and some the second heat-exchanger rigs, the second heat-exchanger rig comprises the 7th header (22), the 8th header (23) and the second heating surface (21), the water inlet of the 7th header (22) is connected with the delivery port of 5-linked case (19), the delivery port of the 7th header (22) is connected with the water inlet of the interior heat exchanger tube of the second heating surface (21), the delivery port of the interior heat-transfer surface of the second heating surface (21) is connected with the water inlet of the 8th header (23), the delivery port of the 8th header (23) is connected with the water inlet of the 6th header (20), in the first heat-exchange system, the water inlet of 5-linked case (19) is connected with the hot water outlet of gas cooler (3), in the first heat-exchange system, the delivery port of the 6th header (20) is connected with the water inlet of 5-linked case (19) in the second heat-exchange system, in the second heat-exchange system, the delivery port of the 6th header (20) is connected with the cooling water inlet of gas cooler (3), the desulfurization fume outlet of desulfurizing tower (7) is connected with the smoke inlet on each second heating surface (21), exhanst gas outlet on each second heating surface (21) is connected with the smoke inlet of chimney (10).
9. according to claim 8ly based on flue gas waste heat recovery and the boiler energy-saving emission-reduction system of thermal technology again, it is characterized in that,
In described gas cooler (3), the first heat is changed intrasystem the first heating surface (16) and is made by ND, and the first heating surface (16) adopts H type finned tube along row counter-flow arrangement.
In described smoke re-heater (8), the first heat is changed intrasystem the second heating surface (21) and is made by plastic steel or two phase stainless steel, and the second heating surface (21) adopts light pipe stagger arrangement counter-flow arrangement;
The second heating surface (21) in described smoke re-heater (8) in the second heat-exchange system is made by 316L steel; The second heating surface (21) adopts H type finned tube along row counter-flow arrangement.
CN201410317045.1A 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 CN104100994B (en)

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