CN104226088A - Ultralow-temperature ultra-clean flue gas exhausting system and method for thermal power plant - Google Patents

Ultralow-temperature ultra-clean flue gas exhausting system and method for thermal power plant Download PDF

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Publication number
CN104226088A
CN104226088A CN201410466877.XA CN201410466877A CN104226088A CN 104226088 A CN104226088 A CN 104226088A CN 201410466877 A CN201410466877 A CN 201410466877A CN 104226088 A CN104226088 A CN 104226088A
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heat
flue gas
scrubbing tower
heat exchange
water
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CN201410466877.XA
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Chinese (zh)
Inventor
肖平
李强
徐正泉
江建忠
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Huaneng Clean Energy Research Institute
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Huaneng Clean Energy Research Institute
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Abstract

The invention relates to an ultralow-temperature ultra-clean flue gas exhausting system and method for a thermal power plant. Flue gas from a wet desulphurization outlet enters from the lower part of a heat exchange scrubbing tower and flows from bottom to top, circulating cooling water flows from top to bottom in the heat exchange scrubbing tower after being atomized by a multi-layer nozzle by a circulating water pump, the flue gas and the atomized circulating cooling water are subjected to strong heat and mass transfer, a great amount of moisture is separated out in the reduction process of flue gas temperature, and a great amount of heat is released; and besides, pollutants in the flue gas are captured by the circulating cooling water, the circulating cooling water is drained through the lower part of the heat exchange scrubbing tower after absorbing the moisture and the heat in the flue gas, enters a circulating water treatment system to be subjected to sedimentation, filtering and chemicals treatment, then enters a heat exchange system to be cooled and is recycled. The system is simple and convenient to operate, can effectively alleviate the phenomenon that a chimney exhausts white smoke after wet desulphurization, can achieve the ultra-clean emission of flue gas of the thermal power plant, can recycle moisture and low-grade heat in the flue gas and has the good environment protection property and the high economical efficiency.

Description

A kind of ultra-clean exhaust system of coal steam-electric plant smoke ultralow temperature and method
Technical field
The present invention relates to coal steam-electric plant smoke draining technology field, be specifically related to the ultra-clean exhaust system of a kind of coal steam-electric plant smoke ultralow temperature and method.
Background technology
Along with the increasingly stringent of national requirements for environmental protection, the environmental protection index of thermal power generation unit requires the standard evolution to ultra-clean discharge.Current conventional Thermal generation unit mainly adopts SCR/SNCR+FGD+ sack cleaner+low-NO_x combustion technology for the control of pollutant, above-mentioned Pollutant Control Technology, Thermal generation unit pollutant emission can be realized and meet up-to-date environment protection emission requirement, but still the requirement of ultra-clean discharge can not be reached, adopt the ultra-clean draining technology of flue gas ultralow temperature, the flue gas of FGD outlet directly contacts with atomizing spray water in heat exchange scrubbing tower, in the process of flue gas and atomizing spray water counter current contacting, there is strong heat and mass transfer process, the major pollutants (NOX/SO in flue gas 2/ dust/Hg etc.) shower water seizure can be atomized, thus reduce the concentration of pollutant in flue gas further, realize ultra-clean discharge.
Wet desulfurization of flue gas by limestone-gypsum method technology is used widely in flue gas desulphurization system with its strong adaptability to unit load, desulfuration efficiency advantages of higher.At present, the temperature general control of wet desulphurization absorption tower exiting flue gas is at about 50 DEG C, and the steam in flue gas is in saturation state, and the water capacity of flue gas is also in higher level.After flue gas enters air, because atmospheric temperature will far below flue-gas temperature (particularly the winter of northern area), after steam quick refrigeration in flue gas, be present in flue gas with the water droplet of fines, produce a large amount of water smoke, chimney emits the phenomenon of white cigarette very serious, also can cause the secondary pollution of gypsum rain simultaneously.Adopt the ultra-clean draining technology of flue gas ultralow temperature, reduce exhaust gas temperature as much as possible, thus reduce the saturation moisture content of flue gas, the moisture in recovered flue gas, reduce wet desulphurization water consumption, alleviate chimney and emit white cigarette phenomenon, prevent the generation of gypsum rain.
Along with the reduction of flue-gas temperature, saturation water meeting condensation in flue gas, discharges a large amount of sensible heats and gasification latent heat, is needing the northern area of central heating, can reclaim by heat pump techniques the thermal source etc. that this part tow taste heat heats as municipal administration in a large number, there is higher economic benefit.
When this part heat cannot utilize, cooling tower can be adopted to cool recirculated cooling water, ensure that the return water temperature of recirculated cooling water meets design requirement, ensure the continuous and steady operation of system.
In a word, the water adopting the ultra-clean draining technology of coal steam-electric plant smoke ultralow temperature significantly can reduce wet desulphurization consumes, reduces pollutant emission in flue gas, reach the requirement of ultra-clean discharge, sensible heat simultaneously in energy recovered flue gas and gasification latent heat, improve the utilization rate of fuel, there is the good feature of environmental protection and economy.Novel environment friendly requirement is met to Thermal generation unit and has very important meaning.
Summary of the invention
In order to overcome above-mentioned prior art Problems existing, the object of the present invention is to provide the ultra-clean exhaust system of a kind of coal steam-electric plant smoke ultralow temperature and method, present system is simple, easy to operate, effectively can alleviate the phenomenon that wet desulphurization after funnel emits white cigarette, reduce the pollutant emission in flue gas, realize the ultra-clean discharge of coal steam-electric plant smoke, moisture simultaneously in energy recovered flue gas and the tow taste heat in flue gas, have the good feature of environmental protection and economy.
To achieve these goals, the present invention is by the following technical solutions:
The ultra-clean exhaust system of a kind of coal steam-electric plant smoke ultralow temperature, comprise a heat exchange scrubbing tower 1, the bottom of described heat exchange scrubbing tower 1 is provided with smoke inlet, is connected with heat-engine plant wet desulfurizing tower exhaust pass, and top is provided with exhanst gas outlet and is connected with the entrance of air-introduced machine 7; In described heat exchange scrubbing tower 1, middle and upper part is provided with multilayer nozzle, the entrance of nozzle is connected with the outlet of water circulating pump 5, above multilayer nozzle, be furnished with multilayer demister, demister is provided with flushing water nozzle, and the entrance of flushing water nozzle is connected with the outlet of flush water pump 6; The bottom of described heat exchange scrubbing tower 1 is provided with dewatering outlet, and dewatering outlet is connected with the entrance of Water Treatment in Circulating Cooling System 2; The bottom of described heat exchange scrubbing tower 1 is also provided with interim sewage draining exit; The outlet of described Water Treatment in Circulating Cooling System 2 is connected with the circulating cooling water inlet of heat-exchange system 3, the circulating cooling water out of described heat-exchange system 3 is connected with the entrance of storage tank 4, the delivery port of described storage tank 4 is connected with the entrance of water circulating pump 5 with flush water pump 6, and the bottom of storage tank 4 is provided with interim sewage draining exit.
The nozzle of 1-5 layer recirculated cooling water is arranged in described heat exchange scrubbing tower 1.
Layer 2-3 demister is arranged in described heat exchange scrubbing tower 1.
Described heat-exchange system 3 is absorption heat pump, and the driving heat source of described absorption heat pump is bled from the low pressure (LP) cylinder of steam turbine of thermal power plant, and heat supply network backwater is as the working medium of absorption heat pump high temperature heat source.
Described heat-exchange system 3 is cooling tower.
The discharge method of the ultra-clean exhaust system of coal steam-electric plant smoke ultralow temperature described above, wet flue gas from the outlet of heat-engine plant wet desulfurizing tower is entered by the smoke inlet of heat exchange scrubbing tower 1, walk from bottom to top in heat exchange scrubbing tower 1, recirculated cooling water is walked from top to bottom via after multilayer nozzle atomization, recirculated cooling water counter current contacting in heat exchange scrubbing tower 1 of flue gas and atomization, there is strong heat and mass transfer process, flue gas is recycled water quench, producing a large amount of condensate water after water vapor condensation in flue gas enters in recirculated cooling water, the sensible heat of flue gas and the gasification latent heat of steam are recycled cooling water and absorb, flue gas after cooling continues up, by being arranged in the demister on heat exchange scrubbing tower 1 top, most of drop in flue gas is removed by demister, part pollutant (SO simultaneously in flue gas 2/ NOx/Hg/ dust etc.) enter recirculated cooling water, flue gas after cooling is finally discharged by the exhanst gas outlet of heat exchange scrubbing tower 1, enters smoke stack emission to air via air-introduced machine 7, Water Treatment in Circulating Cooling System 2 is put into by the dewatering outlet bottom heat exchange scrubbing tower 1 after recirculated cooling water heat absorption, recirculated cooling water is wherein in precipitation, filtration and dosing and after a series of process, entered after heat-exchange system 3 cools by the circulating cooling water inlet of heat-exchange system 3 and enter storage tank 4 by the circulating cooling water out of heat-exchange system 3, the recirculated cooling water in storage tank is sent into heat exchange scrubbing tower 1 via water circulating pump 5 and flush water pump 6 and is recycled.
Flue gas flow rate in described heat exchange scrubbing tower 1 controls between 0.5 ~ 5m/s.
In described heat exchange scrubbing tower 1, the time of staying of flue gas controls at more than 3S.
The exhaust gas temperature of described heat exchange scrubbing tower 1 controls to≤and 40 DEG C.
Control NO x≤ 50mg/Nm 3, SO 2≤ 35mg/Nm 3, dust≤10mg/Nm 3.
Compared to the prior art comparatively, tool of the present invention has the following advantages:
1, the present invention realizes the ultra-clean discharge of coal steam-electric plant smoke, effectively alleviates fired power generating unit and adopts wet desulphurization after funnel to emit the phenomenon of white cigarette, prevent the generation of gypsum rain.Moisture in recovered flue gas, reduces wet desulphurization water consumption, simultaneously by heat recovery technology, improves the utilization ratio of fuel, reduces energy waste.
2, the inventive method combines with Conventional pollution control technology, can control NO in coal steam-electric plant smoke x≤ 50mg/Nm 3, SO 2≤ 35mg/Nm 3, dust≤10mg/Nm 3.
3, the present invention can control coal steam-electric plant smoke exhaust gas temperature≤40 DEG C, reduces wet desulphurization water consumption more than 50%.
Accompanying drawing explanation
Fig. 1 is the ultra-clean discharge method flow chart of coal steam-electric plant smoke ultralow temperature of the present invention.
Fig. 2 is the ultra-clean discharge method flow chart of the embodiment of the present invention 1 coal steam-electric plant smoke ultralow temperature (band heat recovery).
Fig. 3 is the ultra-clean discharge method flow chart (not being with heat recovery) of the embodiment of the present invention 2 coal steam-electric plant smoke ultralow temperature
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention will be described in more detail.
As shown in Figure 1, the ultra-clean exhaust system of a kind of coal steam-electric plant smoke ultralow temperature of the present invention, comprise a heat exchange scrubbing tower 1, the bottom of described heat exchange scrubbing tower 1 is provided with smoke inlet, be connected with heat-engine plant wet desulfurizing tower exhaust pass, top is provided with exhanst gas outlet and is connected with the entrance of air-introduced machine 7; In described heat exchange scrubbing tower 1, middle and upper part is provided with multilayer nozzle, the entrance of nozzle is connected with the outlet of water circulating pump 5, above multilayer nozzle, be furnished with multilayer demister, demister is provided with flushing water nozzle, and the entrance of flushing water nozzle is connected with the outlet of flush water pump 6; The bottom of described heat exchange scrubbing tower 1 is provided with dewatering outlet, and dewatering outlet is connected with the entrance of Water Treatment in Circulating Cooling System 2; The bottom of described heat exchange scrubbing tower 1 is also provided with interim sewage draining exit; The outlet of described Water Treatment in Circulating Cooling System 2 is connected with the circulating cooling water inlet of heat-exchange system 3, the circulating cooling water out of described heat-exchange system 3 is connected with the entrance of storage tank 4, the delivery port of described storage tank 4 is connected with the entrance of water circulating pump 5 with flush water pump 6, and the bottom of storage tank 4 is provided with interim sewage draining exit.
As the preferred embodiment of the present invention, in described heat exchange scrubbing tower 1, arrange the nozzle of 1-5 layer recirculated cooling water.
As the preferred embodiment of the present invention, in described heat exchange scrubbing tower 1, arrange layer 2-3 demister.
As shown in Figure 1, the discharge method of the ultra-clean exhaust system of coal steam-electric plant smoke ultralow temperature of the present invention, wet flue gas from the outlet of heat-engine plant wet desulfurizing tower is entered by the smoke inlet of heat exchange scrubbing tower 1, walk from bottom to top in heat exchange scrubbing tower 1, recirculated cooling water is walked from top to bottom via after multilayer nozzle atomization, recirculated cooling water counter current contacting in heat exchange scrubbing tower 1 of flue gas and atomization, there is strong heat and mass transfer process, flue gas is recycled water quench, producing a large amount of condensate water after water vapor condensation in flue gas enters in recirculated cooling water, the sensible heat of flue gas and the gasification latent heat of steam are recycled cooling water and absorb, flue gas after cooling continues up, by being arranged in the demister on heat exchange scrubbing tower 1 top, most of drop in flue gas is removed by demister, part pollutant (SO simultaneously in flue gas 2/ NOx/Hg/ dust etc.) enter recirculated cooling water, flue gas after cooling is finally discharged by the exhanst gas outlet of heat exchange scrubbing tower 1, enters smoke stack emission to air via air-introduced machine 7, Water Treatment in Circulating Cooling System 2 is put into by the dewatering outlet bottom heat exchange scrubbing tower 1 after recirculated cooling water heat absorption, recirculated cooling water is wherein in precipitation, filtration and dosing and after a series of process, entered after heat-exchange system 3 cools by the circulating cooling water inlet of heat-exchange system 3 and enter storage tank 4 by the circulating cooling water out of heat-exchange system 3, the recirculated cooling water in storage tank is sent into heat exchange scrubbing tower 1 via water circulating pump 5 and flush water pump 6 and is recycled.
Embodiment 1:
As shown in Figure 2, the present embodiment heat-exchange system 3 is absorption heat pump, and the driving heat source of absorption heat pump is bled from the low pressure (LP) cylinder of steam turbine of thermal power plant, and heat supply network backwater is as the working medium of absorption heat pump high temperature heat source.Its discharge method is: the wet flue gas from the outlet of heat-engine plant wet desulfurizing tower is entered by the smoke inlet of heat exchange scrubbing tower 1, walk from bottom to top in heat exchange scrubbing tower 1, recirculated cooling water is walked from top to bottom via after multilayer nozzle atomization, recirculated cooling water counter current contacting in heat exchange scrubbing tower 1 of flue gas and atomization, there is strong heat and mass transfer process, flue gas is recycled water quench, producing a large amount of condensate water after water vapor condensation in flue gas enters in recirculated cooling water, the sensible heat of flue gas and the gasification latent heat of steam are recycled cooling water and absorb, flue gas after cooling continues up, by being arranged in the demister on heat exchange scrubbing tower 1 top, most of drop in flue gas is removed by demister, part pollutant (SO simultaneously in flue gas 2/ NOx/Hg/ dust etc.) enter recirculated cooling water, flue gas after cooling is finally discharged by the exhanst gas outlet of heat exchange scrubbing tower 1, enters smoke stack emission to air via air-introduced machine 7, Water Treatment in Circulating Cooling System 2 is put into by the dewatering outlet bottom heat exchange scrubbing tower 1 after recirculated cooling water heat absorption, recirculated cooling water through precipitation, filter and in dosing and etc. after a series of process, as the low-temperature heat source of absorption heat pump, recirculated cooling water, after crossing absorption heat pump absorbing and cooling temperature, enters storage tank 4.The driving heat source of absorption heat pump is bled from the low pressure (LP) cylinder of steam turbine of thermal power plant, and heat supply network backwater enters absorption heat pump as the working medium of high temperature heat source, enters heat supply network after heat absorption by the high temperature heat source sender property outlet of absorption heat pump.Recirculated cooling water in storage tank 4 is sent into heat exchange scrubbing tower 1 via water circulating pump 5 and flush water pump 6 and is recycled.
Embodiment 2:
As shown in Figure 3, the present embodiment heat-exchange system 3 is cooling tower.Its discharge method is: the wet flue gas from the outlet of heat-engine plant wet desulfurizing tower is entered by the smoke inlet of heat exchange scrubbing tower 1, walk from bottom to top in heat exchange scrubbing tower 1, recirculated cooling water is walked from top to bottom via after multilayer nozzle atomization, recirculated cooling water counter current contacting in heat exchange scrubbing tower 1 of flue gas and atomization, there is strong heat and mass transfer process, flue gas is recycled water quench, producing a large amount of condensate water after water vapor condensation in flue gas enters in recirculated cooling water, the sensible heat of flue gas and the gasification latent heat of steam are recycled cooling water and absorb, flue gas after cooling continues up, by being arranged in the demister on heat exchange scrubbing tower 1 top, most of drop in flue gas is removed by demister, part pollutant (SO simultaneously in flue gas 2/ NOx/Hg/ dust etc.) enter recirculated cooling water, flue gas after cooling is finally discharged by the exhanst gas outlet of heat exchange scrubbing tower 1, enters smoke stack emission to air via air-introduced machine 7, Water Treatment in Circulating Cooling System 2 is put into by the dewatering outlet bottom heat exchange scrubbing tower 1 after recirculated cooling water heat absorption, recirculated cooling water through precipitation, filter and in dosing and etc. after a series of process, enter cooling tower, through cooling tower, enter storage tank 4 after cooling, the recirculated cooling water in storage tank 4 is sent into heat exchange scrubbing tower 1 via water circulating pump 5 and flush water pump 6 and is recycled.

Claims (10)

1. the ultra-clean exhaust system of coal steam-electric plant smoke ultralow temperature, comprise a heat exchange scrubbing tower (1), it is characterized in that: the bottom of described heat exchange scrubbing tower (1) is provided with smoke inlet, be connected with heat-engine plant wet desulfurizing tower exhaust pass, top is provided with exhanst gas outlet and is connected with the entrance of air-introduced machine (7); The interior middle and upper part of described heat exchange scrubbing tower (1) is provided with multilayer nozzle, the entrance of nozzle is connected with the outlet of water circulating pump (5), multilayer demister is furnished with above multilayer nozzle, demister is provided with flushing water nozzle, and the entrance of flushing water nozzle is connected with the outlet of flush water pump (6); The bottom of described heat exchange scrubbing tower (1) is provided with dewatering outlet, and dewatering outlet is connected with the entrance of Water Treatment in Circulating Cooling System (2); The bottom of described heat exchange scrubbing tower (1) is also provided with interim sewage draining exit; The outlet of described Water Treatment in Circulating Cooling System (2) is connected with the circulating cooling water inlet of heat-exchange system (3), the circulating cooling water out of described heat-exchange system (3) is connected with the entrance of storage tank (4), the delivery port of described storage tank (4) is connected with the entrance of water circulating pump (5) with flush water pump (6), and the bottom of storage tank (4) is provided with interim sewage draining exit.
2. the ultra-clean exhaust system of coal steam-electric plant smoke ultralow temperature according to claim 1, is characterized in that: the nozzle arranging 1-5 layer recirculated cooling water in described heat exchange scrubbing tower (1).
3. the ultra-clean exhaust system of coal steam-electric plant smoke ultralow temperature according to claim 1, is characterized in that: arrange layer 2-3 demister in described heat exchange scrubbing tower (1).
4. the ultra-clean exhaust system of coal steam-electric plant smoke ultralow temperature according to claim 1, it is characterized in that: described heat-exchange system (3) is absorption heat pump, the driving heat source of described absorption heat pump is bled from the low pressure (LP) cylinder of steam turbine of thermal power plant, and heat supply network backwater is as the working medium of absorption heat pump high temperature heat source.
5. the ultra-clean exhaust system of coal steam-electric plant smoke ultralow temperature according to claim 1, is characterized in that: described heat-exchange system (3) is cooling tower.
6. adopt the discharge method of the ultra-clean exhaust system of coal steam-electric plant smoke ultralow temperature according to claim 1, it is characterized in that: the wet flue gas from the outlet of heat-engine plant wet desulfurizing tower is entered by the smoke inlet of heat exchange scrubbing tower (1), walk from bottom to top in heat exchange scrubbing tower (1), recirculated cooling water is walked from top to bottom via after multilayer nozzle atomization, recirculated cooling water counter current contacting in heat exchange scrubbing tower (1) of flue gas and atomization, there is strong heat and mass transfer process, flue gas is recycled water quench, producing a large amount of condensate water after water vapor condensation in flue gas enters in recirculated cooling water, the sensible heat of flue gas and the gasification latent heat of steam are recycled cooling water and absorb, flue gas after cooling continues up, by being arranged in the demister on heat exchange scrubbing tower (1) top, most of drop in flue gas is removed by demister, part pollutant simultaneously in flue gas enters recirculated cooling water, flue gas after cooling is finally discharged by the exhanst gas outlet of heat exchange scrubbing tower (1), enters smoke stack emission to air via air-introduced machine (7), Water Treatment in Circulating Cooling System (2) is put into by the dewatering outlet of heat exchange scrubbing tower (1) bottom after recirculated cooling water heat absorption, recirculated cooling water is wherein in precipitation, filtration and dosing and after a series of process, entered after heat-exchange system (3) cools by the circulating cooling water inlet of heat-exchange system (3) and enter storage tank (4) by the circulating cooling water out of heat-exchange system (3), the recirculated cooling water in storage tank is sent into heat exchange scrubbing tower (1) via water circulating pump (5) and flush water pump (6) and is recycled.
7. discharge method according to claim 6, is characterized in that: the flue gas flow rate in described heat exchange scrubbing tower (1) controls between 0.5 ~ 5m/s.
8. discharge method according to claim 6, is characterized in that: the time of staying of the interior flue gas of described heat exchange scrubbing tower (1) controls at more than 3S.
9. discharge method according to claim 6, is characterized in that: the exhaust gas temperature of described heat exchange scrubbing tower (1) controls to≤and 40 DEG C.
10. discharge method according to claim 6, is characterized in that: control NO x≤ 50mg/Nm 3, SO 2≤ 35mg/Nm 3, dust≤10mg/Nm 3.
CN201410466877.XA 2014-09-12 2014-09-12 Ultralow-temperature ultra-clean flue gas exhausting system and method for thermal power plant Pending CN104226088A (en)

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CN105582764A (en) * 2016-02-29 2016-05-18 西安西热锅炉环保工程有限公司 Treatment system and method for flue gas generated by wet desulphurization device in thermal power plant
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CN109482041A (en) * 2018-12-11 2019-03-19 太原理工大学 The environmental protecting device and technique of plume in a kind of reduction flue gas
CN109482041B (en) * 2018-12-11 2021-11-12 太原理工大学 Environment-friendly device and process for reducing smoke plume in smoke

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* Cited by examiner, † Cited by third party
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CN105363319A (en) * 2015-12-14 2016-03-02 山东大学 Device for increasing superheat degree of smoke obtained after wet desulphurization and use method
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CN106765042A (en) * 2016-12-05 2017-05-31 中国华能集团清洁能源技术研究院有限公司 The coal fired power plant broad sense heat regenerative system and method for a kind of combination nature draught cooling tower
CN109482041A (en) * 2018-12-11 2019-03-19 太原理工大学 The environmental protecting device and technique of plume in a kind of reduction flue gas
CN109482041B (en) * 2018-12-11 2021-11-12 太原理工大学 Environment-friendly device and process for reducing smoke plume in smoke

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Application publication date: 20141224