CN104266210A - Energy saving system for deeply reducing emission and capable of replacing GGH (Gas-Gas Heater) - Google Patents

Energy saving system for deeply reducing emission and capable of replacing GGH (Gas-Gas Heater) Download PDF

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Publication number
CN104266210A
CN104266210A CN201410537923.0A CN201410537923A CN104266210A CN 104266210 A CN104266210 A CN 104266210A CN 201410537923 A CN201410537923 A CN 201410537923A CN 104266210 A CN104266210 A CN 104266210A
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China
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heat exchanger
heat
heater
input
ggh
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CN201410537923.0A
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Chinese (zh)
Inventor
常海青
袁朝
张燕
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CHENGXIN GREEN INTEGRATION Co Ltd
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CHENGXIN GREEN INTEGRATION Co Ltd
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Priority to CN201410537923.0A priority Critical patent/CN104266210A/en
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Abstract

The invention discloses an energy saving system for deeply reducing emission and capable of replacing a GGH (Gas-Gas Heater). The energy saving system comprises an air preheater, a high-temperature heat exchanger, a low-temperature heat exchanger first section, a dry electrostatic dust collector, an induced draft fan, a booster fan, a desulfurizing tower, a wet electric dust collector, a low-temperature heat exchanger second section, a chimney, a secondary fan, a low-pressure heater, a first water pump and a second water pump, wherein the air preheater, the high-temperature heat exchanger, the low-temperature heat exchanger first section, the dry electrostatic dust collector, the induced draft fan, the booster fan, the desulfurizing tower, the wet electric dust collector, the low-temperature heat exchanger second section and the chimney are connected in series to a tail flue of a boiler in sequence; the secondary fan is connected in series to a secondary air duct. After the structure and the system configuration are adopted, the dust collection efficiency of the dry electrostatic dust collector can be improved, the operation of the wet dust collector is facilitated, the water consumption of the wet electric dust collector is saved, the service performance of the GGH is replaced by using the new device, and meanwhile the purpose of recovering the waste heat of exhaust fume to the greatest extent is achieved.

Description

A kind of degree of depth reduces discharging and the energy conserving system of alternative GGH
Technical field
The present invention relates to the technical field of boiler power plant, particularly relate to a kind of degree of depth and reduce discharging and the energy conserving system of alternative GGH.
Background technology
Haze weather is attacked again and again in recent years, and coal fired power generation one time is regarded as the arch-criminal of haze.The thermal power plant of 47 key cities' main city zone of Chinese Ministry of Environmental Protection's No. 14 bulletin requirements in 2013, need meet special emission limit 20mg/m in the soot emissions of chimney entrance after dust removal installation and desulphurization system transformation 3.And " qualified discharge " more and more cannot meet the requirement of people to environment, if the pollutant emission of coal unit can reach 1/10th of the special emission limit in fossil-fuel power plant atmospheric pollutant emission standard key area, realizing " zero-emission ", is the ultimate aim of Coal Clean efficiency utilization.
In China's active service fired power generating unit, the exhaust gas temperature of boiler, about 130 DEG C ~ 160 DEG C, substantially all exceedes intrinsic economic exhaust gas temperature 110 DEG C.By the impact of thermal power plant's ature of coal condition, when use coal poor or exhaust gas temperature is higher time, flue dust ratio resistance is higher, the efficiency of dust collection of dry electrostatic cleaner is caused to reduce, dust emission level does not often reach the requirement of national standard, and when not arranging GGH, because behind absorption tower, flue-gas temperature is lower, and carry gypsum particle, chimney easily occurs " gypsum rain " and emit " white cigarette " problem, and after GGH is set, " gypsum rain " problem can be controlled, but GGH invests and operating cost is higher, from current ruuning situation, it is high that GGH also also exists resistance, corrosion is serious with blocking, the shortcomings such as equipment investment is high.
Meanwhile, because demand for energy increases, coal shortage brings series of problems to power industry.To adopt an effective measure raising energy utilization rate, reduce the common recognition that cost of electricity-generating has become electricity power enterprise.
Therefore, design one and can reduce dust discharge amount; Can make full use of smoke discharging residual heat again, the new system simultaneously GGH can replaced is most important.
Summary of the invention
Technical problem underlying to be solved by this invention is to provide a kind of degree of depth and reduces discharging and the energy conserving system of alternative GGH, be intended to overcome prior art and think that exhaust gas temperature need be arranged on the technology prejudice of more than flue gas acid dew point, dry electrostatic cleaner inlet flue gas temperature is down near flue gas acid dew point, dry electrostatic cleaner dust specific resistance is declined, to improve dry electrostatic cleaner efficiency of dust collection, to connect after desulfurizing tower wet electrical dust precipitator, realize dust close to zero-emission; And adopt new equipment to replace the using function of GGH, meanwhile, realize the object reclaiming smoke discharging residual heat to greatest extent.
For solving the problems of the technologies described above, the invention provides a kind of degree of depth to reduce discharging and the energy conserving system of alternative GGH, comprise the air preheater, high-temperature heat-exchanging, cryogenic heat exchanger one section, dry electrostatic cleaner, air-introduced machine, booster fan, desulfurizing tower, wet electrical dust precipitator, cryogenic heat exchanger two sections and the chimney that are serially connected with boiler back end ductwork successively; And be serially connected with the overfire air fan of cold secondary air duct; Native system also comprises low-pressure heater, the first water pump and the second water pump;
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 first water pump, the heat transferring medium output of described high-temperature heat-exchanging connects the output of described low-pressure heater;
The heat transferring medium output of described cryogenic heat exchanger one section connects the heat transferring medium input of described cryogenic heat exchanger two sections through described second water pump, the heat transferring medium output of described cryogenic heat exchanger two sections connects the heat transferring medium input of described cryogenic heat exchanger one section.
Further, the outlet temperature of described cryogenic heat exchanger one section is 75-100 DEG C.
Further, the outlet temperature of described cryogenic heat exchanger two sections is 75-80 DEG C.
Further, native system also comprises expansion tank, and the output of described expansion tank connects the input of described second water pump.
Further, described 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 first 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 first water pump input, described 4th valve is connected between described 4th heater input and the first water pump input.
Further, described cryogenic heat exchanger two sections is membrane heat exchanger, comprises heat exchange fin and fluid hose; Described fluid hose is located at the both sides of described heat exchange fin, and described heat exchange fin comprises base plate, top board and two pipes; Described two pipes are arranged in parallel and have elongated slot vertically, and described base plate is positioned opposite with top board and be connected base and the top margin of described two pipe elongated slots respectively in both sides; The diameter of two pipes of described heat exchange fin is greater than the diameter of described fluid hose; Described base plate and top board are arranged in parallel or arrange in splayed configuration.
After present invention employs technique scheme, by exhaust gas temperature is dropped to below flue gas acid dew point, namely by reducing below dry electrostatic cleaner inlet flue gas temperature to flue gas acid dew point, reduce dry electrostatic cleaner dust specific resistance, effectively improve the efficiency of dust collection of dry electrostatic cleaner, dust emission concentration reduces, and can reach discharging standards; Meanwhile, adopt wet electrical dust precipitator, make the dust discharge amount degree of depth be reduced to 5mg/Nm 3below, and ensure that wet electrical dust precipitator is in optimum operation environment; Under the prerequisite not affecting using function, the parts of this highly energy-consuming of GGH, high fault rate can be cancelled, under about 80 DEG C of lower exhaust gas temperatures, achieve the object reclaiming smoke discharging residual heat to greatest extent.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of cryogenic heat exchanger of the present invention two sections;
Fig. 3 is cryogenic heat exchanger of the present invention two sections of heat exchange fins is the schematic diagram of parallel construction;
The schematic diagram of Fig. 4 to be the heat exchange fin of cryogenic heat exchanger of the present invention two sections be splayed structure.
Detailed description of the invention
As shown in Figure 1, the invention discloses a kind of degree of depth to reduce discharging and the energy conserving system of alternative GGH, comprise the air preheater 1, high-temperature heat-exchanging 2, cryogenic heat exchanger one section 3, dry electrostatic cleaner 13, air-introduced machine 14, booster fan 15, desulfurizing tower 16, wet electrical dust precipitator 17, cryogenic heat exchanger two section 4 and the chimney 18 that are serially connected with boiler back end ductwork successively; And be serially connected with the overfire air fan 19 of the cold secondary air duct 12 of boiler; Native system also comprises low-pressure heater 5, first water pump 7, second water pump 8;
Described low-pressure heater 5 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 2 through described first water pump 7, the heat transferring medium output of described high-temperature heat-exchanging 2 connects the output of described low-pressure heater 5;
The heat transferring medium output that described cryogenic heat exchanger is one section 3 connects the heat transferring medium input of described cryogenic heat exchanger two section 4 through described second water pump 8, and the heat transferring medium output that described cryogenic heat exchanger is two section 4 connects the heat transferring medium input of described cryogenic heat exchanger one section 3.
Further, described cryogenic heat exchanger one section of 3 outlet temperature is 75-100 DEG C; Preferably, described cryogenic heat exchanger one section of 3 outlet temperature is 80 DEG C.
Further, the outlet temperature of described cryogenic heat exchanger two section 4 is 75-80 DEG C; Preferably, described cryogenic heat exchanger two section of 4 outlet temperature is 80 DEG C.
Further, native system also comprises expansion tank 31, and the output of described expansion tank connects the input of described second water pump 8.
Further, described low-pressure heater 5 comprises the primary heater 51, secondary heater 52, the 3rd heater 53 and the 4th heater 54 that are connected in series successively.
Further, native system also comprises recirculation control valve 21, first valve 61, second valve 62, 3rd valve 63 and the 4th valve 64, 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 first water pump 7, described first valve 61 is connected between described primary heater 51 output and the heat transferring medium output of high-temperature heat-exchanging 2, described second valve 62 is connected between described primary heater 51 input and the heat transferring medium output of high-temperature heat-exchanging 2, described 3rd valve 63 is connected between described secondary heater 52 input and the first water pump 7 input, described 4th valve 64 is connected between described 4th heater 54 input and the first water pump 7 input.
This method is through practical application, and the exhaust gas temperature of air preheater outlet is 145 DEG C, and can be used for the boiler feedwater of heating boiler heat regenerative system, the steam decreasing steam turbine draws gas, and improves the generating efficiency of steam turbine; The heat of the low-temperature flue gas that cryogenic heat exchanger one section absorbs can be used to heat the flue gas after wet electrical dust precipitator, the flue-gas temperature entering chimney is made to be raised to 80 DEG C from original 50 DEG C, improve exhaust gas temperature, the raising of exhaust gas temperature, improve the exhaustion smoke height of chimney, while reduction flue gas is to chimney corrosion, decrease the pollution of smoke evacuation to environment.
Further, as shown in Figures 2 to 4, described cryogenic heat exchanger two section 4 is membrane heat exchanger, comprises heat exchange fin 41 and fluid hose 42, described heat exchange fin and fluid hose surface coating inorganic nonmetallic materials, and through high-temperature process, temperature: 800-1000 DEG C; Or be coated with acidproof polymeric coating layer again.Described fluid hose 42 is located at the both sides of described heat exchange fin 41.Described heat exchange fin 41 comprises base plate 411, top board 412 and two pipes 413; Described two pipes 413 are arranged in parallel and have elongated slot vertically, described base plate 411 and both sides positioned opposite with top board 412 are connected base and the top margin of described two pipe 413 elongated slots respectively, the diameter of two pipes 413 of described heat exchange fin is greater than the diameter of described fluid hose 42, described base plate 411 and top board 412 is arranged in parallel or in splayed configuration arrange.The above-mentioned design of heat exchange fin of the present invention and layout, not only have larger area of dissipation, Stability Analysis of Structures, and level and smooth streamline, is conducive to reducing washing away of flue dust, life-extending.
The base plate 411 of the heat exchange fin 41 in this cryogenic heat exchanger two section 4, top board 412 and two pipes 413 form the special pipe that cross section is dumb-bell shape, band steel structure is added compared to the light pipe of traditional membrane type heat exchanger plates, add heat exchange area, enhance flue gas 41 stream between fluid hose 42 and heat exchange fin, reach the object of enhanced heat exchange; The dumbbell-shaped section of described heat exchange fin 41 has good flexibility simultaneously, carries out, in high-temperature heat treatment process, effectively to reduce high temperature deformation at heat exchange fin 41, improves the quality of heat exchange fin 41; Described heat exchange fin 41 can realize batch production by mould, reduces cost of manufacture; Membrane type heat exchanger plates that described temperature heat exchanger is two section 4 adopts some above-mentioned heat exchange fins 41 to form, and some fluid hoses 42 to be located between some heat exchange fins 41 and to be communicated with according to this, thus improves the heat transfer efficiency of whole cryogenic heat exchanger two section 4.The diameter of the pipe 413 of described heat exchange fin 41 both sides is greater than the diameter of fluid hose 42, avoids directly washing away of high ash-laden gas fluid pipe 42, effectively can prevent dust stratification.Simultaneously, the surface of described fluid hose 42 and heat exchange fin 41 is coated with Inorganic and Nonmetallic Coating and acidproof polymeric coating layer, the acid resistance of cryogenic heat exchanger two section 4 is strengthened greatly, and can overcome cold end corrosion well, making flue-gas temperature be down to below acid dew point becomes possibility.Dumbbell shape structure heat exchange fin is adopted to be because in later stage nonmetallic materials coating, in high-temperature process, not yielding (relatively existing band steel heat exchange fin) and can heat exchange area be increased.
Native system installs wet cottrell additional, not only overcome dry electrostatic cleaner " inverse corona " and " reentrainment of dust " two technical bottlenecks, improve efficiency of dust collection simultaneously, wet cottrell can effectively reduce pollutant emission in flue gas, to gypsum drop, acid mist, toxic heavy metal and PM10, especially the fine dust of PM2.5 has good removal effect, realizes dust 5mg/Nm 3following " near-zero release ", to the power plant's ubiquitous desulfuration absorbing tower demister poor effect put into operation at present, the tools such as gypsum rain pollution improve significantly effect.
After present invention employs technique scheme, by exhaust gas temperature is dropped to below flue gas acid dew point, namely by reducing below dry electrostatic cleaner inlet flue gas temperature to flue gas acid dew point, reduce dry electrostatic cleaner dust specific resistance, effectively improve the efficiency of dust collection of dry electrostatic cleaner, dust emission concentration reduces; Meanwhile, adopt wet electrical dust precipitator, make the dust discharge amount degree of depth be reduced to 5mg/Nm 3below, and ensure that wet electrical dust precipitator is in optimum operation environment; Under the prerequisite not affecting using function, the parts of this highly energy-consuming of GGH, high fault rate can be cancelled, under about 80 DEG C of lower exhaust gas temperatures, achieve the object reclaiming smoke discharging residual heat to greatest extent.
All distortion that those of ordinary skill in the art can directly derive from the disclosure of invention or associate, all should think protection scope of the present invention.

Claims (7)

1. the degree of depth reduces discharging and an energy conserving system of alternative GGH, it is characterized in that: comprise the air preheater, high-temperature heat-exchanging, cryogenic heat exchanger one section, dry electrostatic cleaner, air-introduced machine, booster fan, desulfurizing tower, wet electrical dust precipitator, cryogenic heat exchanger two sections and the chimney that are serially connected with boiler back end ductwork successively; And being serially connected with the overfire air fan of cold secondary air duct, native system also comprises low-pressure heater, the first water pump and the second water pump;
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 first water pump, the heat transferring medium output of described high-temperature heat-exchanging connects the output of described low-pressure heater;
The heat transferring medium output of described cryogenic heat exchanger one section connects the heat transferring medium input of described cryogenic heat exchanger two sections through described second water pump, the heat transferring medium output of described cryogenic heat exchanger two sections connects the heat transferring medium input of described cryogenic heat exchanger one section.
2. a kind of degree of depth as claimed in claim 1 reduces discharging and the energy conserving system of alternative GGH, it is characterized in that: the outlet temperature of described cryogenic heat exchanger one section is 75-100 DEG C.
3. a kind of degree of depth as claimed in claim 1 reduces discharging and the energy conserving system of alternative GGH, it is characterized in that: the outlet temperature of described cryogenic heat exchanger two sections is 75-80 DEG C.
4. a kind of degree of depth as claimed in claim 1 reduces discharging and the energy conserving system of alternative GGH, it is characterized in that: native system also comprises expansion tank, and the output of described expansion tank connects the input of described second water pump.
5. a kind of degree of depth as claimed in claim 1 reduces discharging and the energy conserving system of alternative GGH, 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.
6. a kind of degree of depth as claimed in claim 5 reduces discharging and the energy conserving system of alternative GGH, 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 first 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 first water pump input, described 4th valve is connected between described 4th heater input and the first water pump input.
7. a kind of degree of depth as claimed in claim 1 reduces discharging and the energy conserving system of alternative GGH, it is characterized in that: described cryogenic heat exchanger two sections is membrane heat exchanger, comprises heat exchange fin and fluid hose; Described fluid hose is located at the both sides of described heat exchange fin, and described heat exchange fin comprises base plate, top board and two pipes; Described two pipes are arranged in parallel and have elongated slot vertically, and described base plate is positioned opposite with top board and be connected base and the top margin of described two pipe elongated slots respectively in both sides; The diameter of two pipes of described heat exchange fin is greater than the diameter of described fluid hose; Described base plate and top board are arranged in parallel or arrange in splayed configuration.
CN201410537923.0A 2014-10-13 2014-10-13 Energy saving system for deeply reducing emission and capable of replacing GGH (Gas-Gas Heater) Pending CN104266210A (en)

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CN201410537923.0A CN104266210A (en) 2014-10-13 2014-10-13 Energy saving system for deeply reducing emission and capable of replacing GGH (Gas-Gas Heater)
CN201410825929.8A CN104633683A (en) 2014-10-13 2014-12-25 Deep-emission-reduction energy-saving system capable of replacing GGH

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CN201410825929.8A Pending CN104633683A (en) 2014-10-13 2014-12-25 Deep-emission-reduction energy-saving system capable of replacing GGH

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CN201392126Y (en) * 2009-04-16 2010-01-27 大冶斯瑞尔换热器有限公司 Corrugated surface fin
JP5848032B2 (en) * 2011-06-01 2016-01-27 三菱重工環境・化学エンジニアリング株式会社 Smoke removal equipment
CN203586249U (en) * 2013-10-15 2014-05-07 广东中节能环保有限公司 Water medium type smoke heat exchanging system
CN103968406B (en) * 2014-05-13 2016-06-01 上海发电设备成套设计研究院 A kind of hydrophily flue gas-smoke heat exchanging system and method that can prevent low temperature corrosion
CN104165351A (en) * 2014-08-21 2014-11-26 成信绿集成股份有限公司 Emission reduction and energy conservation system without GGH

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Application publication date: 20150107