CN104006401A - Power station boiler smoke waste heat deep recycling and emission reducing system - Google Patents
Power station boiler smoke waste heat deep recycling and emission reducing system Download PDFInfo
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- CN104006401A CN104006401A CN201310534820.4A CN201310534820A CN104006401A CN 104006401 A CN104006401 A CN 104006401A CN 201310534820 A CN201310534820 A CN 201310534820A CN 104006401 A CN104006401 A CN 104006401A
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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 invention discloses a power station boiler smoke waste heat deep recycling and emission reducing system. A first low-temperature heat exchanger is arranged between an air pre-heater and a dust remover, a second low-temperature heat exchanger is arranged between a pressurizing fan and a desulfurizing tower, an air heat exchanger is arranged between a secondary fan and the air pre-heater, a heat exchanging medium output end of the air heat exchanger is connected with a heat exchanging medium input end of the second low-temperature heat exchanger through a first water pump, a heat exchanging medium output end of the second low-temperature heat exchanger is connected with a heat exchanging medium input end of the first low-temperature heat exchanger, and a heat exchanging medium output end of the first low-temperature heat exchanger is connected with a heat exchanging medium input end of the air heat exchanger. According to the power station boiler smoke waste heat deep recycling and emission reducing system, the defect existing in waste heat recycle of traditional low-temperature economizers is overcome, smoke temperatures can be deeply reduced, smoke temperature distribution is optimized, and the purposes of deeply recycling smoke waste heat and reducing dust discharge concentration are achieved.
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 main thermal loss of Thermal Power Station is lost and caused by the cold source energy of steam turbine and the heat extraction of boiler smoke.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.Conventionally boiler back end ductwork adopts low-level (stack-gas) economizer to carry out Mist heat recovering, but cannot the degree of depth reduce flue-gas temperature, and UTILIZATION OF VESIDUAL HEAT IN efficiency is low, and effects of energy saving and emission reduction is poor.The patent No. is that 201320157980.7 Chinese patent discloses a kind of residual heat from boiler fume recycling system of improving structure, it comprises that the air preheater that is sequentially arranged on an axis, outlet cigarette temperature are high-temperature heat-exchanging, deduster, blower fan, cryogenic heat exchanger, desulfurizing tower and the chimney of acid dew point+10～+ 15 DEG C, and at least two condensate water low-pressure heaters that are connected in series, also comprise and be positioned at the air heater and the air blower that on another axis, connect air preheater.Although this patented technology scheme can be carried out degree of depth recovery to fume afterheat, but before deduster, be only provided with high-temperature heat-exchanging, the heat of its waste heat recovery is limited and the cigarette temperature after out, higher than acid dew point, makes dust removing effects owe excellent through high-temperature heat-exchanging, affects the emission reduction effect of system.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of degree of depth of boiler of power plant fume afterheat and recycles and emission-reducing system, native system has overcome the defect of traditional flue gas heat recovery, can the degree of depth reduce flue-gas temperature, optimize flue-gas temperature and distribute, 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 is recycled and emission-reducing system comprises air preheater, deduster, air-introduced machine, booster fan, desulfurizing tower and the chimney and the overfire air fan that are serially connected with successively boiler flue, and described overfire air fan output connects boiler air input through described air preheater, native system also comprises the first cryogenic heat exchanger, the second cryogenic heat exchanger, air heat exchanger and the first water pump, described the first cryogenic heat exchanger is located between described air preheater and deduster, described the 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 the second cryogenic heat exchanger through described the first water pump, the heat transferring medium output of described the second cryogenic heat exchanger connects the heat transferring medium input of described the first cryogenic heat exchanger, the heat transferring medium output of described the 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 the 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, and described bypass valve is located between the heat transferring medium input and output of described the second cryogenic heat exchanger.
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 the first water pump.Further, above-mentioned low-pressure heater comprises primary heater, secondary heater, the 3rd heater and the 4th heater of serial connection successively.
Further, native system also comprises recirculation control valve, the first valve, the second valve, the 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 the first valve is connected between described primary heater output and the heat transferring medium output of high-temperature heat-exchanging, described the second valve is connected between described primary heater input and the heat transferring medium output of high-temperature heat-exchanging, described the 3rd valve is connected between described secondary heater input and the second water pump input, described the 4th valve is connected between described the 4th heater input and the second water pump input.
Further, above-mentioned recirculation control valve is electric control valve.
Further, above-mentioned the first water pump and the second water pump are variable frequency pumps.
Because degree of depth recycling and the emission-reducing system of boiler of power plant fume afterheat of the present invention have adopted technique scheme, the first cryogenic heat exchanger that is native system is located between air preheater and deduster, the 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 has overcome the defect of traditional low-level (stack-gas) economizer Mist heat recovering, can the degree of depth reduce flue-gas temperature, optimizes flue-gas temperature and distributes, and reaches the object of degree of depth Mist heat recovering and reduction dust emission concentration.
Brief description of the drawings
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 is recycled 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 the overfire air fan 18 that are serially connected with successively boiler flue 11, and described overfire air fan 18 outputs connect boiler air input 12 through described air preheater 1, native system also comprises the first cryogenic heat exchanger 3, the second cryogenic heat exchanger 4, air heat exchanger 5 and the first water pump 8, described the first cryogenic heat exchanger 3 is located between described air preheater 1 and deduster 13, described the 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 the second cryogenic heat exchanger 4 through described the first water pump 8, the heat transferring medium output of described the second cryogenic heat exchanger 4 connects the heat transferring medium input of described the first cryogenic heat exchanger 3, the heat transferring medium output of described the 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, the 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 the 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, and described bypass valve 41 is located between the heat transferring medium input and output of described the second cryogenic heat exchanger 4.
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 the first water pump 8.Expansion tank 51 is arranged in system peak, guarantees that system pressure is stable, avoids equipment and pipeline generation cavitation; The volumetric expansion causing of being heated of expansion tank 51 available buffer media, guarantees system safety operation, and therefore expansion tank 51 can play the effect of level pressure and expansion.
Further, above-mentioned low-pressure heater 6 comprises primary heater 61, secondary heater 62, the 3rd heater 63 and the 4th heater 64 of serial connection successively.
Further, native system also comprises recirculation control valve 21, the first valve 71, the second valve 72, the 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 the first valve 71 is connected between described primary heater 71 outputs and the heat transferring medium output of high-temperature heat-exchanging 2, described the second valve 72 is connected between described primary heater 71 inputs and the heat transferring medium output of high-temperature heat-exchanging 2, described the 3rd valve 73 is connected between described secondary heater 62 inputs and the second water pump 9 inputs, described the 4th valve 74 is connected between described the 4th heater 64 inputs and the second water pump 9 inputs.
Further, above-mentioned recirculation control valve 21 is electric control valves.
Further, above-mentioned the 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, by the hydrophily pipeline composition circulatory system, arranges the first water pump, for overcoming equipment and the resistance of ducting, adjust flux, controls flue-gas temperature; Heat transferring medium input and the output of the second cryogenic heat exchanger 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 level pressure before pump, accommodate and the breathing amount of bucking-out system heat transferring medium.
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, heat the air that enters boiler by air heater, improve fume afterheat quality, improve fume afterheat utilization ratio, make more than generating set benefit of saving coal reaches 3g/kWh, in the good situation of operating mode, can reach 4.2g/kWh, and traditional flue gas is recycled the benefit of saving coal of scheme generally in 2.0g/kWh left and right, therefore native system has significant waste heat recovery and energy-saving benefit; On the other hand, the flue-gas temperature that enters deduster by the first cryogenic heat exchanger control, reduce flue gas volume, optimize exhaust gas dust and compare 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 is recycled the chimney breast dust of scheme more than 25mg/Nm3, therefore native system has obvious reduction of discharging effect.
In native system, further adopt high-temperature heat-exchanging and to be serially connected with low-pressure heater in steam turbine condensate system in parallel, low-pressure heater can adopt four heaters to be in series, the second water pump is set in pipeline, be used for overcoming equipment and the resistance of ducting, adjust flux, in order to control exhanst gas outlet temperature; Four valves that arrange are respectively two inlet valves and two backwater valves, for according to the flooding parameter of different regulating working conditions high-temperature heat-exchangings and backwater position; Recirculation control valve is set on water return pipeline, for regulating diversion pipeline fluid temperature (F.T.), avoids pipeline wall temperature too low.From air preheater out, after high-temperature heat-exchanging, by the second water pump control, flue-gas temperature is down to above 15～20 DEG C of left and right of acid dew point to boiler smoke; Flue gas after temperature drop enters the first cryogenic heat exchanger, by the first water pump control, flue-gas temperature is down near flue gas acid dew point, and flue gas enters deduster; Deduster flue gas out enters the second cryogenic heat exchanger after booster fan boosts, and by regulating the bypass valve aperture of the second cryogenic heat exchanger, makes flue-gas temperature be down to 80 DEG C, enters desulfurizing tower; Clean flue gas enters atmosphere 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, the first cryogenic heat exchanger is used for controlling deduster input gas temperature, and the heat one that the heat of absorption absorbs by hydrophily pipeline and the second cryogenic heat exchanger is used from the air of 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, squeezes the low-pressure heater that the quality of bleeding is higher and bleeds, 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 that adds Hot gas turbine condensate water for bleeding is typically provided with multiple, comprise that the condensate water input that is serially connected with successively steam turbine is to the 4th heater of output, the 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, conventionally the condensate water that high-temperature heat-exchanging utilizes fume afterheat to heat is by the more inferior condensate water of the 3rd heater and the 4th heater, and can not heat by the condensate water of the higher quality of primary heater and secondary heater, so fume afterheat utilization rate is low, native system heats the air that enters air preheater by air heater, make boiler flue-gas temperature out higher, therefore can heat primary heater that the quality of bleeding is higher and the condensate water of secondary heater by high-temperature heat-exchanging.This high-temperature heat-exchanging is in high ash-laden gas environment, and dust stratification and wearing and tearing need be taken measures to prevent in the aspects such as its material, technique, design.
The first cryogenic heat exchanger is for regulating the flue-gas temperature that enters deduster, and 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; By flue-gas temperature control, dust specific resistance in flue gas is optimized simultaneously, improves the efficiency of dust collection of deduster, thereby reduce dust emission, avoid environmental pollution.The first cryogenic heat exchanger is in high ash-laden gas environment, and operation flue-gas temperature is near acid dew point, and dust stratification, abrasion and corrosion need be taken measures to prevent in the aspects such as its material, technique, design.
The flue gas temperature rise heat that the second cryogenic heat exchanger causes booster fan fully reclaims, and regulates the flue-gas temperature that enters desulfurizing tower at 80 DEG C, for degree of depth Mist heat recovering, and by the air of the ducted heat transferring medium heating of hydrophily air preheater import.The second cryogenic heat exchanger is in low cigarette temperature environment, and dust stratification, abrasion and corrosion need be taken measures to prevent in the aspects such as its material, technique, design.
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, make to rise through the flue-gas temperature of air preheater outlet, improve flue gas quality, improve native system flue gas waste heat recovery efficiency, the air themperature that is 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 that is serially connected with successively boiler flue, 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, the second cryogenic heat exchanger, air heat exchanger and the first water pump, described the first cryogenic heat exchanger is located between described air preheater and deduster, described the 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 the second cryogenic heat exchanger through described the first water pump, the heat transferring medium output of described the second cryogenic heat exchanger connects the heat transferring medium input of described the first cryogenic heat exchanger, the heat transferring medium output of described the 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 the 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, described bypass valve is located between the heat transferring medium input and output of described the second cryogenic heat exchanger.
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 the 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 primary heater, secondary heater, the 3rd heater and the 4th heater of serial connection 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, the first valve, the second valve, the 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 the first valve is connected between described primary heater output and the heat transferring medium output of high-temperature heat-exchanging, described the second valve is connected between described primary heater input and the heat transferring medium output of high-temperature heat-exchanging, described the 3rd valve is connected between described secondary heater input and the second water pump input, described the 4th valve is connected between described the 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 the first water pump and the second water pump are variable frequency pumps.
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Cited By (8)
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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 |
| CN104654339A (en) * | 2015-01-28 | 2015-05-27 | 东方电气集团东方锅炉股份有限公司 | WGGH (Water Gas Gas Heater) system |
| 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 |
| CN106439899A (en) * | 2016-08-31 | 2017-02-22 | 中国大唐集团科学技术研究院有限公司 | Air cooling unit steam turbine waste heat using system and method |
| 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 |
| CN109974497A (en) * | 2019-03-19 | 2019-07-05 | 中国能源建设集团华北电力试验研究院有限公司 | It is a kind of with waste heat recycle and except coloured plume function heat accumulation peak regulation system |
| CN114674161A (en) * | 2022-04-28 | 2022-06-28 | 萍乡市辉龙包装材料有限公司 | Secondary deep recovery method and device for low-temperature flue gas waste heat of ceramic brick kiln |
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| 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 |
| CN109974497A (en) * | 2019-03-19 | 2019-07-05 | 中国能源建设集团华北电力试验研究院有限公司 | It is a kind of with waste heat recycle and except coloured plume function heat accumulation peak regulation system |
| 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 |
| CN114674161A (en) * | 2022-04-28 | 2022-06-28 | 萍乡市辉龙包装材料有限公司 | Secondary deep recovery method and device for low-temperature flue gas waste heat of ceramic brick kiln |
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| CN104006401B (en) | 2016-02-10 |
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