CN105318313A - Smoke waste-heat utilization system based on selective catalytic reduction (SCR) denitration device - Google Patents
Smoke waste-heat utilization system based on selective catalytic reduction (SCR) denitration device Download PDFInfo
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- CN105318313A CN105318313A CN201510223260.XA CN201510223260A CN105318313A CN 105318313 A CN105318313 A CN 105318313A CN 201510223260 A CN201510223260 A CN 201510223260A CN 105318313 A CN105318313 A CN 105318313A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention discloses a smoke waste-heat utilization system based on a selective catalytic reduction (SCR) denitration device. The smoke waste-heat utilization system comprises a boiler (1), an economizer (2), the SCR denitration device (17), an air preheater (18), a front air preheater (29), a dust remover (27), an induced draft fan (28), a desulfurizer (30), a chimney (31), a smoke waste-heat recovery system and a water supply regenerative system. The smoke waste-heat recovery system comprises a first-grade heater (6), a second-grade heater (5) and a smoke cooler (19). The water supply regenerative system comprises a condenser (25), a water supply pump (16), a deaerator (15) and a condensate water pump (26). According to the smoke waste-heat utilization system, it can be ensured that the SCR denitration device is put into operation continuously, and emission of NOx is controlled; correspondingly, waste heat contained in temperature increasing of exhausted smoke needs to be recycled, so that the energy use efficiency is improved greatly, the efficiency of the dust remover is improved, and the water consumption of the desulfurizer is reduced.
Description
Technical field
The present invention relates to coal-fired power station boiler and Pollutant Control Technology field, be specifically related to a kind of smoke waste heat utilization system based on SCR denitration device.
Background technology
The operating temperature of SCR catalyst has stricter requirement, and high and low temperature all has clear and definite restriction.The too high meeting of temperature causes catalyst surface to sinter, and fractions of active ingredient loses, and then catalyst activity is reduced.According to product performance, in operation, SCR entrance flue gas temperature does not allow more than 427 DEG C, if exceed this temperature can cause catalyst eventual failure.The too low activity that can affect catalyst of temperature, if lower than 300 DEG C, under the effect of same catalyst, SCR also side reaction can generate ammonium hydrogen sulfate, this is that a kind of viscosity is strong and have corrosive material, blocks hole, reduce catalyst activity with good adherence of catalyst surface, and Corrosion blockage is caused to the heating surface of downstream boiler afterbody, affect boiler operatiopn;
Utility Boiler Efficiency is about 88%-94%, and in various heat loss, heat loss due to exhaust gas accounts for the 70%-80% of boiler heat loss.The key factor affecting heat loss due to exhaust gas is exhaust gas temperature, and generally, exhaust gas temperature often increases by 10 DEG C, and heat loss due to exhaust gas increases 0.6%-1.0%, and unit increases hear rate 1.2%-2.4%.The design exhaust gas temperature of coal-fired power station boiler is mostly at 120-140 DEG C, and coal-fired source is complicated, depart from larger with designing coal quality, exhaust gas temperature actual motion value is general all higher than design load, the discharge smoke temperature of power station boiler of part burning high sulfur coal and brown coal can reach 160 DEG C even higher, and boiler exhaust gas is abundant cryogenic waste heat resource.The higher boiler thermal output that causes of exhaust gas temperature is more on the low side than design load, seriously reduces the utilization ratio of the energy, also causes dust collector efficiency to reduce and the increase of desulfurizing tower water consumption.
Summary of the invention
The object of the invention is to provide a kind of smoke waste heat utilization system based on SCR denitration device, and it can solve problem existing in background technology effectively.
In order to solve problem existing in background technology, it comprises boiler 1, economizer 2, SCR denitration device 17, air preheater 18, forward type air preheater 29, deduster 27, air-introduced machine 28, desulfurizer 30, chimney 31, flue gas waste heat recovery system and water supply heat back system, described flue gas waste heat recovery system comprises primary heater 6, secondary heater 5 and gas cooler 19, described water supply heat back system comprises condenser 25, feed pump 16, oxygen-eliminating device 15, condensate pump 26, first high-pressure heater 12, second high-pressure heater 13, third high pressure heater 14, first low-pressure heater 23 and the second low-pressure heater 24, described economizer 2 is arranged in the back-end ductwork of boiler 1, it enters hot junction and is connected with the hot junction that goes out of boiler 1, the hot junction that goes out of described economizer 2 is connected with the input of flue gas waste heat recovery system, described economizer 2 gas approach place is provided with gas bypass baffle plate 3, its opposite side is provided with flue collector baffle plate 4, the output of described flue gas waste heat recovery system is connected with the hot junction that goes out of boiler 1, described deduster 27, air-introduced machine 28, forward type air preheater 29 is connected with the flue gas input of chimney 31 with the flue gas output of boiler 1 after connecting successively with the flue gas output of desulfurizer 30 respectively, the air input of described forward type air preheater 29 is connected with the air input of output with boiler 1, described SCR denitration device 17 is arranged near the flue outlet of economizer 2, described air preheater 18 is arranged on bottom SCR denitration device 17, the bottom of described air preheater 18 is provided with gas cooler 19, described feed pump 16 is connected with secondary heater 5 with the primary heater 6 be arranged near economizer 2, the water side of described feed pump 16 is connected with the water inlet end of primary heater 6, the water side of described primary heater 6 is connected with the water inlet end of secondary heater 5 through the first control valve 7 by conduit, the water side of heater 14 is pressed in the water side of described secondary heater 5 and primary heater 6 respectively by conduit and third high, the water inlet end of the second high-pressure heater 13 and water side, the water inlet end of the first high-pressure heater 12 is connected with water side, heater 14 is pressed through third high successively by conduit in the water side of described feed pump 16, second high-pressure heater 13 is connected with the first high-pressure heater 12, the first high-pressure heater bypass valve 8 is provided with near the water side of described first high-pressure heater 12, the second high-pressure heater bypass valve 9 is provided with near the water side of described second high-pressure heater 13, third high pressure heater by-pass valve 10 is provided with near the water side of described third high pressure heater 14, the water side of described condensate pump 26 is connected with the water inlet end of gas cooler 19 through the second control valve 22 by conduit, the water side of described gas cooler 19 is connected with water side through the water inlet end of conduit with the first low-pressure heater 23, described oxygen-eliminating device 15 is connected with the water side of condensate pump 26 with the second low-pressure heater 24 through the first low-pressure heater 23 successively by conduit, the first low-pressure heater bypass valve 20 is provided with near the water side of described first low-pressure heater 23, the second low-pressure heater bypass valve 21 is provided with near the water side of described second low-pressure heater 24, described air preheater 18 is connected by air duct 32 with between forward type air preheater 29.
Owing to have employed above technical scheme, the present invention has following beneficial effect: can ensure that SCR denitration device puts into operation continuously, controls NOx emission; Raise in requisition for recovery exhaust gas temperature the waste heat contained, improve the utilization ratio of the energy greatly, improve the efficiency of deduster, and decrease the water consumption of desulfurizer.
Accompanying drawing explanation
In order to be illustrated more clearly in the present invention, below in conjunction with accompanying drawing, embodiment is briefly described.
Fig. 1 is structural representation of the present invention.
Detailed description of the invention
The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention being clearly and completely described.
Embodiment 1
Referring to Fig. 1, a kind of smoke waste heat utilization system based on SCR denitration device, it comprises boiler 1, economizer 2, SCR denitration device 17, air preheater 18, forward type air preheater 29, deduster 27, air-introduced machine 28, desulfurizer 30, chimney 31, flue gas waste heat recovery system and water supply heat back system, described flue gas waste heat recovery system comprises primary heater 6, secondary heater 5 and gas cooler 19, described water supply heat back system comprises condenser 25, feed pump 16, oxygen-eliminating device 15, condensate pump 26, first high-pressure heater 12, second high-pressure heater 13, third high pressure heater 14, first low-pressure heater 23 and the second low-pressure heater 24, described economizer 2 is arranged in the back-end ductwork of boiler 1, it enters hot junction and is connected with the hot junction that goes out of boiler 1, the hot junction that goes out of described economizer 2 is connected with the input of flue gas waste heat recovery system, described economizer 2 gas approach place is provided with gas bypass baffle plate 3, its opposite side is provided with flue collector baffle plate 4, the output of described flue gas waste heat recovery system is connected with the hot junction that goes out of boiler 1, described deduster 27, air-introduced machine 28, forward type air preheater 29 is connected with the flue gas input of chimney 31 with the flue gas output of boiler 1 after connecting successively with the flue gas output of desulfurizer 30 respectively, the air input of described forward type air preheater 29 is connected with the air input of output with boiler 1, described SCR denitration device 17 is arranged near the flue outlet of economizer 2, described air preheater 18 is arranged on bottom SCR denitration device 17, the bottom of described air preheater 18 is provided with gas cooler 19, described feed pump 16 is connected with secondary heater 5 with the primary heater 6 be arranged near economizer 2, the water side of described feed pump 16 is connected with the water inlet end of primary heater 6, the water side of described primary heater 6 is connected with the water inlet end of secondary heater 5 through the first control valve 7 by conduit, the water side of heater 14 is pressed in the water side of described secondary heater 5 and primary heater 6 respectively by conduit and third high, the water inlet end of the second high-pressure heater 13 and water side, the water inlet end of the first high-pressure heater 12 is connected with water side, heater 14 is pressed through third high successively by conduit in the water side of described feed pump 16, second high-pressure heater 13 is connected with the first high-pressure heater 12, the first high-pressure heater bypass valve 8 is provided with near the water side of described first high-pressure heater 12, the second high-pressure heater bypass valve 9 is provided with near the water side of described second high-pressure heater 13, third high pressure heater by-pass valve 10 is provided with near the water side of described third high pressure heater 14, the water side of described condensate pump 26 is connected with the water inlet end of gas cooler 19 through the second control valve 22 by conduit, the water side of described gas cooler 19 is connected with water side through the water inlet end of conduit with the first low-pressure heater 23, described oxygen-eliminating device 15 is connected with the water side of condensate pump 26 with the second low-pressure heater 24 through the first low-pressure heater 23 successively by conduit, the first low-pressure heater bypass valve 20 is provided with near the water side of described first low-pressure heater 23, the second low-pressure heater bypass valve 21 is provided with near the water side of described second low-pressure heater 24, described air preheater 18 is connected by air duct 32 with between forward type air preheater 29.
Embodiment 2
Set up gas bypass at economizer 2 flue, namely set up gas bypass baffle plate 3 at economizer 2 gas approach place, bypass flue gas cools without economizer, and economizer 2 exports cold flue gas and mixes with it, jointly enters in SCR denitration device 17.The present embodiment, when meeting SCR denitration device 17 inlet flue gas temperature and remaining on the requirement of 316 DEG C-420 DEG C, determines the excursion of bypass flue gas share.
Air preheater 18 entrance cold air and air preheater 18 flue-gas temperature difference larger, forward type air preheater 29 pairs of cold airs are adopted to heat, then can improve air preheater 18 entering air temperature, reduce itself and the flue gas heat exchange temperature difference, desulfurizer 30 inlet flue gas waste heat can be utilized to heat.
After air preheater 18 intake air carries out forward type air preheater 29 preheating, make air preheater exit gas temperature higher, be necessary to utilize gas cooler 19 to carry out waste heat recovery, heating working medium comes from condensate water in steam turbine water supply heat back system, adopts the mode in parallel with feed-water heater to access heat regenerative system.
Embodiment 3
When load is higher or ruuning situation change makes furnace outlet gas temperature too high, requirement economizer 2 exports cigarette temperature can not higher than 420 DEG C, open gas bypass baffle plate 3, open the 3rd by-pass valve control 11 simultaneously, bypass secondary heater 5 and primary heater 6 is made to absorb flue gas heat, meet with flue collector baffle plate 4 after main flume converge after, to enter before SCR denitration device 17 below cigarette temperature drop to 420 DEG C, according to feed water by-pass outlet water temperature, open corresponding high-pressure heater bypass valve, import among feedwater sprue;
Load is reduced to about 50% when making furnace outlet gas temperature too low, requirement economizer 2 exports cigarette temperature can not lower than 320 DEG C, only open gas bypass baffle plate 3, flue collector main flume carries out heat release to economizer, makes to converge flue-gas temperature higher than 320 DEG C after flue collector valve;
It is high that air preheater 18 exports cigarette temperature, open the second control valve 22, adopt gas cooler 19 to make flue gas be cooled to the above 15-20 DEG C of flue gas acid dew point, according to condensed water bypass outlet water temperature, open corresponding low-pressure heater bypass valve, import among condensed water sprue.Desulfurizer 30 inlet flue gas, adopts corrosion-resistant preposition air preheater 29 (heat pipe-type), about making its cigarette temperature drop to 80 DEG C, add hot-air continue to enter air preheater 18 heat after, deliver to coal mill system.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art should be appreciated that it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (1)
1. the smoke waste heat utilization system based on SCR denitration device, it is characterized in that it comprises boiler (1), economizer (2), SCR denitration device (17), air preheater (18), forward type air preheater (29), deduster (27), air-introduced machine (28), desulfurizer (30), chimney (31), flue gas waste heat recovery system and water supply heat back system, described flue gas waste heat recovery system comprises primary heater (6), secondary heater (5) and gas cooler (19), described water supply heat back system comprises condenser (25), feed pump (16), oxygen-eliminating device (15), condensate pump (26), first high-pressure heater (12), second high-pressure heater (13), third high pressure heater (14), first low-pressure heater (23) and the second low-pressure heater (24), described economizer (2) is arranged in the back-end ductwork of boiler (1), it enters hot junction and is connected with the hot junction that goes out of boiler (1), the hot junction that goes out of described economizer (2) is connected with the input of flue gas waste heat recovery system, described economizer (2) gas approach place is provided with gas bypass baffle plate (3), its opposite side is provided with flue collector baffle plate (4), the output of described flue gas waste heat recovery system is connected with the hot junction that goes out of boiler (1), described deduster (27), air-introduced machine (28), forward type air preheater (29) is connected with the flue gas input of chimney (31) with the flue gas output of boiler (1) after connecting successively with the flue gas output of desulfurizer (30) respectively, the air input of described forward type air preheater (29) is connected with the air input of output with boiler (1), described SCR denitration device (17) is arranged near the flue outlet of economizer (2), described air preheater (18) is arranged on SCR denitration device (17) bottom, the bottom of described air preheater (18) is provided with gas cooler (19), described feed pump (16) is connected with secondary heater (5) with the primary heater (6) be arranged near economizer (2), the water side of described feed pump (16) is connected with the water inlet end of primary heater (6), the water side of described primary heater (6) is connected through the water inlet end of the first control valve (7) with secondary heater (5) by conduit, the water side of heater (14) is pressed in the water side of described secondary heater (5) and primary heater (6) respectively by conduit and third high, the water inlet end of the second high-pressure heater (13) and water side, the water inlet end of the first high-pressure heater (12) is connected with water side, heater (14) is pressed through third high successively by conduit in the water side of described feed pump (16), second high-pressure heater (13) is connected with the first high-pressure heater (12), the first high-pressure heater bypass valve (8) is provided with near the water side of described first high-pressure heater (12), the second high-pressure heater bypass valve (9) is provided with near the water side of described second high-pressure heater (13), row third high is established to press heater by-pass valve (10) near the water side of described third high pressure heater (14), the water side of described condensate pump (26) is connected through the water inlet end of the second control valve (22) with gas cooler (19) by conduit, the water side of described gas cooler (19) is connected with water side through the water inlet end of conduit with the first low-pressure heater (23), described oxygen-eliminating device (15) is connected with the water side of the second low-pressure heater (24) with condensate pump (26) through the first low-pressure heater (23) successively by conduit, the first low-pressure heater bypass valve (20) is provided with near the water side of described first low-pressure heater (23), the second low-pressure heater bypass valve (21) is provided with near the water side of described second low-pressure heater (24), described air preheater (18) is connected by air duct (32) with between forward type air preheater (29).
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| CN105674315A (en) * | 2016-04-12 | 2016-06-15 | 国电南京自动化股份有限公司 | Double-circuit and double-circulation heat exchanging system |
| CN106823792A (en) * | 2017-03-31 | 2017-06-13 | 华能国际电力股份有限公司玉环电厂 | Full load SCR flue gas denitrification systems |
| CN107036115A (en) * | 2017-05-26 | 2017-08-11 | 山西大学 | A kind of system of deep exploitation residual heat from boiler fume and pollutant removing |
| CN107366897A (en) * | 2017-07-05 | 2017-11-21 | 国网山东省电力公司电力科学研究院 | A kind of Pollutant in Coal Burning Boiler emission reduction optimization collaboration fume afterheat deep exploitation system |
| CN107687634A (en) * | 2017-06-23 | 2018-02-13 | 山东泓奥电力科技有限公司 | The denitration of boiler full load couples fume afterheat gradient utilization system |
| CN109838776A (en) * | 2019-02-22 | 2019-06-04 | 东方菱日锅炉有限公司 | Steam-water circulation system for waste incineration and generating electricity |
| WO2021238321A1 (en) * | 2020-05-24 | 2021-12-02 | 西安交通大学 | Efficient and flexible clean coal-fired power generation system having adaptive configuration, and operating method |
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| CN109838776A (en) * | 2019-02-22 | 2019-06-04 | 东方菱日锅炉有限公司 | Steam-water circulation system for waste incineration and generating electricity |
| WO2021238321A1 (en) * | 2020-05-24 | 2021-12-02 | 西安交通大学 | Efficient and flexible clean coal-fired power generation system having adaptive configuration, and operating method |
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