CN104006401B - The degree of depth of boiler of power plant fume afterheat is recycled and emission-reducing system - Google Patents
The degree of depth of boiler of power plant fume afterheat is recycled and emission-reducing system Download PDFInfo
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- CN104006401B CN104006401B CN201310534820.4A CN201310534820A CN104006401B CN 104006401 B CN104006401 B CN 104006401B CN 201310534820 A CN201310534820 A CN 201310534820A CN 104006401 B CN104006401 B CN 104006401B
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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
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Abstract
The degree of depth that the invention discloses a kind of boiler of power plant fume afterheat is recycled and emission-reducing system, namely the first cryogenic heat exchanger of native system is located between air preheater and deduster, second cryogenic heat exchanger is located between booster fan and desulfurizing tower, air heat exchanger is located between overfire air fan and air preheater, the heat transferring medium output of air heat exchanger connects the heat transferring medium input of the second cryogenic heat exchanger through the first water pump, the heat transferring medium output of the second cryogenic heat exchanger connects the heat transferring medium input of the first cryogenic heat exchanger, the heat transferring medium output of the first cryogenic heat exchanger connects the heat transferring medium input of air heat exchanger.Native system overcomes the defect of Conventional cryogenic economizer Mist heat recovering, the degree of depth can reduce flue-gas temperature, optimize flue-gas temperature distribution, reach the object of degree of depth Mist heat recovering and reduction dust emission concentration.
Description
Technical field
The degree of depth that the present invention relates to a kind of boiler of power plant fume afterheat is recycled and emission-reducing system.
Background technology
The major heat loss of Thermal Power Station is lost by the heat extraction of the cold source energy of steam turbine and boiler smoke and causes.Wherein the heat loss due to exhaust gas of boiler smoke is one maximum in boiler various heat losses, and the exhaust gas temperature of station boiler is generally 120 ~ 150 DEG C, and corresponding heat loss is equivalent to 5% ~ 12% of fuel heat.Usual boiler back end ductwork adopts low-level (stack-gas) economizer to carry out Mist heat recovering, but the degree of depth cannot reduce flue-gas temperature, and utilization rate of waste heat is low, and effects of energy saving and emission reduction is poor.The patent No. be 201320157980.7 Chinese patent disclose a kind of residual heat from boiler fume recycling system of modified node method, it comprises the air preheater be sequentially arranged on an axis, outlet cigarette temperature is acid dew point+10 ~+15 DEG C high-temperature heat-exchanging, deduster, blower fan, cryogenic heat exchanger, desulfurizing tower and chimney, and at least two condensate water low-pressure heaters be connected in series, also comprise the air heater and air blower that are positioned at and another axis connect air preheater.Although this art solutions can carry out degree of depth recovery to fume afterheat, but before deduster, be only provided with high-temperature heat-exchanging, the thermal Finite of its waste heat recovery and through high-temperature heat-exchanging out after cigarette temperature higher than acid dew point, make dust removing effects owe excellent, the emission reduction effect of influential system.
Summary of the invention
The degree of depth that technical problem to be solved by this invention is to provide a kind of boiler of power plant fume afterheat is recycled and emission-reducing system, native system overcomes the defect of traditional flue gas heat recovery, the degree of depth can reduce flue-gas temperature, optimize flue-gas temperature distribution, reach the object of degree of depth Mist heat recovering and reduction dust emission concentration.
For solving the problems of the technologies described above, the degree of depth of boiler of power plant fume afterheat of the present invention recycles and emission-reducing system comprises air preheater, deduster, air-introduced machine, booster fan, desulfurizing tower and the chimney and overfire air fan that are serially connected with boiler flue successively, and described overfire air fan output connects boiler air input through described air preheater, native system also comprises the first cryogenic heat exchanger, second cryogenic heat exchanger, air heat exchanger and the first water pump, described first cryogenic heat exchanger is located between described air preheater and deduster, described second cryogenic heat exchanger is located between described booster fan and desulfurizing tower, described air heat exchanger is located between described overfire air fan and air preheater, the heat transferring medium output of described air heat exchanger connects the heat transferring medium input of described second cryogenic heat exchanger through described first water pump, the heat transferring medium output of described second cryogenic heat exchanger connects the heat transferring medium input of described first cryogenic heat exchanger, the heat transferring medium output of described first cryogenic heat exchanger connects the heat transferring medium input of described air heat exchanger.
Further, native system also comprises high-temperature heat-exchanging, the second water pump and low-pressure heater, described high-temperature heat-exchanging is located between described air preheater and the first cryogenic heat exchanger, described low-pressure heater is serially connected with in the main condensate pipeline of steam turbine, the input of described low-pressure heater connects the heat transferring medium input of described high-temperature heat-exchanging through described second water pump, the heat transferring medium output of described high-temperature heat-exchanging connects the output of described low-pressure heater.
Further, native system also comprises bypass valve, between the heat transferring medium input that described bypass valve is located at described second cryogenic heat exchanger and output.
Further, above-mentioned bypass valve is electric control valve.
Further, native system also comprises expansion tank, and the output of described expansion tank connects the input of described first water pump.Further, above-mentioned low-pressure heater comprises the primary heater, secondary heater, the 3rd heater and the 4th heater that are connected in series successively.
Further, native system also comprises recirculation control valve, first valve, second valve, 3rd valve and the 4th valve, described recirculation control valve is serially connected with between the heat transferring medium output of described high-temperature heat-exchanging and the input of the second water pump, described first valve is connected between described primary heater output and the heat transferring medium output of high-temperature heat-exchanging, described second valve is connected between described primary heater input and the heat transferring medium output of high-temperature heat-exchanging, described 3rd valve is connected between described secondary heater input and the second water pump input, described 4th valve is connected between described 4th heater input and the second water pump input.
Further, above-mentioned recirculation control valve is electric control valve.
Further, above-mentioned first water pump and the second water pump are variable frequency pumps.
The degree of depth due to boiler of power plant fume afterheat of the present invention recycles and emission-reducing system have employed technique scheme, namely the first cryogenic heat exchanger of native system is located between air preheater and deduster, second cryogenic heat exchanger is located between booster fan and desulfurizing tower, air heat exchanger is located between overfire air fan and air preheater, the heat transferring medium output of air heat exchanger connects the heat transferring medium input of the second cryogenic heat exchanger through the first water pump, the heat transferring medium output of the second cryogenic heat exchanger connects the heat transferring medium input of the first cryogenic heat exchanger, the heat transferring medium output of the first cryogenic heat exchanger connects the heat transferring medium input of air heat exchanger.Native system overcomes the defect of Conventional cryogenic economizer Mist heat recovering, the degree of depth can reduce flue-gas temperature, optimize flue-gas temperature distribution, reach the object of degree of depth Mist heat recovering and reduction dust emission concentration.
Accompanying drawing explanation
Below in conjunction with drawings and embodiments, the present invention is described in further detail:
Fig. 1 is that the degree of depth of boiler of power plant fume afterheat of the present invention is recycled and emission-reducing system schematic diagram.
Detailed description of the invention
As shown in Figure 1, the degree of depth of boiler of power plant fume afterheat of the present invention recycles and emission-reducing system comprises air preheater 1, deduster 13, air-introduced machine 14, booster fan 15, desulfurizing tower 16 and the chimney 17 and overfire air fan 18 that are serially connected with boiler flue 11 successively, and described overfire air fan 18 output connects boiler air input 12 through described air preheater 1, native system also comprises the first cryogenic heat exchanger 3, second cryogenic heat exchanger 4, air heat exchanger 5 and the first water pump 8, described first cryogenic heat exchanger 3 is located between described air preheater 1 and deduster 13, described second cryogenic heat exchanger 4 is located between described booster fan 15 and desulfurizing tower 16, described air heat exchanger 5 is located between described overfire air fan 18 and air preheater 1, the heat transferring medium output of described air heat exchanger 5 connects the heat transferring medium input of described second cryogenic heat exchanger 4 through described first water pump 8, the heat transferring medium output of described second cryogenic heat exchanger 4 connects the heat transferring medium input of described first cryogenic heat exchanger 3, the heat transferring medium output of described first cryogenic heat exchanger 3 connects the heat transferring medium input of described air heat exchanger 5.
Further, native system also comprises high-temperature heat-exchanging 2, second water pump 9 and low-pressure heater 6, described high-temperature heat-exchanging 2 is located between described air preheater 1 and the first cryogenic heat exchanger 3, described low-pressure heater 6 is serially connected with in the main condensate pipeline 65 of steam turbine, the input of described low-pressure heater 6 connects the heat transferring medium input of described high-temperature heat-exchanging 2 through described second water pump 9, the heat transferring medium output of described high-temperature heat-exchanging 2 connects the output of described low-pressure heater 6.
Further, native system also comprises bypass valve 41, between the heat transferring medium input that described bypass valve 41 is located at described second cryogenic heat exchanger 4 and output.
Further, above-mentioned bypass valve 41 is electric control valves.
Further, native system also comprises expansion tank 51, and the output of described expansion tank 51 connects the input of described first water pump 8.Expansion tank 51 is arranged in system peak, guarantees that system pressure is stablized, avoids equipment and pipeline generation cavitation; Expansion tank 51 available buffer medium is heated the volumetric expansion caused, and guarantee system safety operation, therefore expansion tank 51 can play the effect of level pressure and expansion.
Further, above-mentioned low-pressure heater 6 comprises the primary heater 61, secondary heater 62, the 3rd heater 63 and the 4th heater 64 that are connected in series successively.
Further, native system also comprises recirculation control valve 21, first valve 71, second valve 72, 3rd valve 73 and the 4th valve 74, described recirculation control valve 21 is serially connected with between the heat transferring medium output of described high-temperature heat-exchanging 2 and the input of the second water pump 9, described first valve 71 is connected between described primary heater 71 output and the heat transferring medium output of high-temperature heat-exchanging 2, described second valve 72 is connected between described primary heater 71 input and the heat transferring medium output of high-temperature heat-exchanging 2, described 3rd valve 73 is connected between described secondary heater 62 input and the second water pump 9 input, described 4th valve 74 is connected between described 4th heater 64 input and the second water pump 9 input.
Further, above-mentioned recirculation control valve 21 is electric control valves.
Further, above-mentioned first water pump 8 and the second water pump 9 are variable frequency pumps.
In native system, the heat transferring medium of the first cryogenic heat exchanger, the second cryogenic heat exchanger and air heat exchanger is by the hydrophily pipeline composition circulatory system, arranging the first water pump, for overcoming equipment and the resistance of ducting, adjust flux, controlling flue-gas temperature; The heat transferring medium input of the second cryogenic heat exchanger and output arrange bypass valve, for regulating the second cryogenic heat exchanger exit gas temperature; The circulatory system arranges expansion tank, and expansion tank is connected to the first pump entrance by single tube, for the breathing amount of heat transferring medium in level pressure, collecting and bucking-out system before pump.
Because native system was provided with the first cryogenic heat exchanger before deduster, on the one hand, after it is connected in series with the second cryogenic heat exchanger, the air of boiler is entered by air heater heating, improve fume afterheat quality, improve fume afterheat utilization ratio, generating set benefit of saving coal is made to reach more than 3g/kWh, 4.2g/kWh can be reached in the good situation of operating mode, and traditional flue gas recycles the benefit of saving coal of scheme generally at about 2.0g/kWh, therefore native system has significant waste heat recovery and energy-saving benefit; On the other hand, the flue-gas temperature entering deduster is controlled by the first cryogenic heat exchanger, reduce flue gas volume, optimize exhaust gas dust ratio resistance, increase the efficiency of dust collection of deduster, and then make chimney breast dust emission concentration be reduced to 15 ~ 18mg/Nm3, reach discharging standards, and traditional flue gas recycles the chimney breast dust of scheme at more than 25mg/Nm3, therefore native system has and significantly reduces discharging effect.
Adopt high-temperature heat-exchanging in parallel with the low-pressure heater be serially connected with in steam turbine condensate system in native system further, low-pressure heater can adopt four heaters to be in series, second water pump is set in pipeline, for overcoming equipment and the resistance of ducting, adjust flux, in order to control flue gas exit temperature; Four valves arranged are respectively two inlet valves and two backwater valves, for according to the flooding parameter of different regulating working conditions high-temperature heat-exchanging and backwater position; Water return pipeline arranging recirculation control valve, for regulating diversion pipeline fluid temperature (F.T.), avoiding pipeline wall temperature too low.From air preheater out, after high-temperature heat-exchanging, controlled by the second water pump, flue-gas temperature is down to more than acid dew point about 15 ~ 20 DEG C to boiler smoke; Flue gas after temperature drop enters the first cryogenic heat exchanger, and controlled by the first water pump, make flue-gas temperature be down near flue gas acid dew point, flue gas enters deduster; Deduster flue gas out enters the second cryogenic heat exchanger after booster fan boosting, by regulating the bypass valve aperture of the second cryogenic heat exchanger, making flue-gas temperature be down to 80 DEG C, entering desulfurizing tower; Neat stress enters air by chimney subsequently.The heat that high-temperature heat-exchanging absorbs simultaneously coordinates the condensate water for adding Hot gas turbine with primary heater and secondary heater, first cryogenic heat exchanger is for controlling deduster input gas temperature, and the heat one that the heat of absorption is absorbed by hydrophily pipeline and the second cryogenic heat exchanger is used from the air heating air preheater import.
In native system, high-temperature heat-exchanging utilizes fume afterheat to add Hot gas turbine condensate water, controls exit gas temperature, and the low-pressure heater squeezing quality of bleeding higher is bled, and reduces the consumption of standard coal for power generation of generating set hear rate and generating set.In the prior art, the low-pressure heater adding Hot gas turbine condensate water for bleeding is typically provided with multiple, comprise the condensate water input that is serially connected with steam turbine successively the 4th heater to output, 3rd heater, secondary heater and primary heater, condensate water input and output are condenser output and the oxygen-eliminating device input of the condensate system of steam turbine, the condensate water that usual high-temperature heat-exchanging utilizes fume afterheat to heat is the more inferior condensate water by the 3rd heater and the 4th heater, and the condensate water of the higher quality of primary heater and secondary heater can not be heated by, fume afterheat utilization rate like this is low, native system enters the air of air preheater by air heater heating, makes boiler flue-gas temperature out higher, therefore can be heated the condensate water of the higher primary heater of quality of bleeding and secondary heater by high-temperature heat-exchanging.This high-temperature heat-exchanging is in high ash-laden gas environment, and the aspect such as its material, technique, design need take measures to prevent dust stratification and wearing and tearing.
First cryogenic heat exchanger enters the flue-gas temperature of deduster for regulating, flue-gas temperature significantly reduces, and the flue gas volume flow in deduster and downstream thereof reduces, and reduces the energy consumption of deduster and air-introduced machine; Controlled by flue-gas temperature simultaneously, dust specific resistance in flue gas is optimized, improve the efficiency of dust collection of deduster, thus reduce dust emission, avoid environmental pollution.First cryogenic heat exchanger is in high ash-laden gas environment, and run flue-gas temperature near acid dew point, the aspect such as its material, technique, design need take measures to prevent dust stratification, abrasion and corrosion.
The flue gas temperature rise heat that booster fan causes by the second cryogenic heat exchanger fully reclaims, and regulates the flue-gas temperature entering desulfurizing tower at 80 DEG C, for degree of depth Mist heat recovering, and is heated the air of air preheater import by the ducted heat transferring medium of hydrophily.Second cryogenic heat exchanger is in low cigarette temperature environment, and the aspect such as its material, technique, design need take measures to prevent dust stratification, abrasion and corrosion.
The flue gas heat that air heater utilizes the first cryogenic heat exchanger and the second cryogenic heat exchanger to absorb, the inlet air of heating air preheater, the flue-gas temperature through air preheater outlet is made to increase, improve flue gas quality, improve native system flue gas waste heat recovery efficiency, the air themperature being entered boiler by air preheater rises, and boiler efficiency is improved.
Claims (9)
1. the degree of depth of a boiler of power plant fume afterheat is recycled and emission-reducing system, comprise the air preheater being serially connected with boiler flue successively, deduster, air-introduced machine, booster fan, desulfurizing tower and chimney and overfire air fan, described overfire air fan output connects boiler air input through described air preheater, it is characterized in that: native system also comprises the first cryogenic heat exchanger, second cryogenic heat exchanger, air heat exchanger and the first water pump, described first cryogenic heat exchanger is located between described air preheater and deduster, described second cryogenic heat exchanger is located between described booster fan and desulfurizing tower, described air heat exchanger is located between described overfire air fan and air preheater, the heat transferring medium output of described air heat exchanger connects the heat transferring medium input of described second cryogenic heat exchanger through described first water pump, the heat transferring medium output of described second cryogenic heat exchanger connects the heat transferring medium input of described first cryogenic heat exchanger, the heat transferring medium output of described first cryogenic heat exchanger connects the heat transferring medium input of described air heat exchanger.
2. the degree of depth of boiler of power plant fume afterheat according to claim 1 is recycled and emission-reducing system, it is characterized in that: native system also comprises high-temperature heat-exchanging, the second water pump and low-pressure heater, described high-temperature heat-exchanging is located between described air preheater and the first cryogenic heat exchanger, described low-pressure heater is serially connected with in the main condensate pipeline of steam turbine, the input of described low-pressure heater connects the heat transferring medium input of described high-temperature heat-exchanging through described second water pump, the heat transferring medium output of described high-temperature heat-exchanging connects the output of described low-pressure heater.
3. the degree of depth of boiler of power plant fume afterheat according to claim 1 and 2 is recycled and emission-reducing system, it is characterized in that: native system also comprises bypass valve, between the heat transferring medium input that described bypass valve is located at described second cryogenic heat exchanger and output.
4. the degree of depth of boiler of power plant fume afterheat according to claim 3 is recycled and emission-reducing system, it is characterized in that: described bypass valve is electric control valve.
5. the degree of depth of boiler of power plant fume afterheat according to claim 4 is recycled and emission-reducing system, it is characterized in that: native system also comprises expansion tank, and the output of described expansion tank connects the input of described first water pump.
6. the degree of depth of boiler of power plant fume afterheat according to claim 2 is recycled and emission-reducing system, it is characterized in that: described low-pressure heater comprises the primary heater, secondary heater, the 3rd heater and the 4th heater that are connected in series successively.
7. the degree of depth of boiler of power plant fume afterheat according to claim 6 is recycled and emission-reducing system, it is characterized in that: native system also comprises recirculation control valve, first valve, second valve, 3rd valve and the 4th valve, described recirculation control valve is serially connected with between the heat transferring medium output of described high-temperature heat-exchanging and the input of the second water pump, described first valve is connected between described primary heater output and the heat transferring medium output of high-temperature heat-exchanging, described second valve is connected between described primary heater input and the heat transferring medium output of high-temperature heat-exchanging, described 3rd valve is connected between described secondary heater input and the second water pump input, described 4th valve is connected between described 4th heater input and the second water pump input.
8. the degree of depth of boiler of power plant fume afterheat according to claim 7 is recycled and emission-reducing system, it is characterized in that: described recirculation control valve is electric control valve.
9. the degree of depth of boiler of power plant fume afterheat according to claim 7 is recycled and emission-reducing system, it is characterized in that: described first water pump and the second water pump are variable frequency pumps.
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| CN104197306A (en) * | 2014-09-02 | 2014-12-10 | 叶金辉 | Boiler fuel gas waste heat recovery system |
| CN104456526A (en) * | 2014-11-26 | 2015-03-25 | 电能（北京）节能技术有限公司 | Boiler flue gas waste heat recovery and recycle system |
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| CN105020737A (en) * | 2015-07-22 | 2015-11-04 | 成信绿集成股份有限公司 | System for improving safety of air pre-heater by utilizing spiral-fin type heat exchanger |
| CN106439899B (en) * | 2016-08-31 | 2019-01-11 | 中国大唐集团科学技术研究院有限公司 | Air cooling unit turbine exhaust heat utilizes system |
| CN108844090A (en) * | 2018-06-26 | 2018-11-20 | 中国能源建设集团广东省电力设计研究院有限公司 | Energy-saving wet flue gas air inducing equipment and method |
| CN109974497B (en) * | 2019-03-19 | 2020-11-03 | 中国能源建设集团华北电力试验研究院有限公司 | Heat storage peak regulation system with waste heat recovery and colored smoke plume removing functions |
| CN114674161B (en) * | 2022-04-28 | 2023-06-16 | 萍乡市辉龙包装材料有限公司 | Method and device for recycling low-temperature flue gas waste heat of ceramic tile kiln in secondary depth |
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Address after: 361007 room 619, No. 1901 Si channel, Huli District, Fujian, Xiamen Patentee after: Chengxin Integrated Technology Co., Ltd. Address before: 361007 room 619, No. 1901 Si channel, Huli District, Fujian, Xiamen Patentee before: Chengxin Green Integration Co., Ltd. |
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