CN209490656U - It is a kind of to disappear white device for fire coal tail gas desulphurization denitration dedusting - Google Patents

It is a kind of to disappear white device for fire coal tail gas desulphurization denitration dedusting Download PDF

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Publication number
CN209490656U
CN209490656U CN201821619938.1U CN201821619938U CN209490656U CN 209490656 U CN209490656 U CN 209490656U CN 201821619938 U CN201821619938 U CN 201821619938U CN 209490656 U CN209490656 U CN 209490656U
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tower
ggh
water
outlet
demister
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CN201821619938.1U
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王岳军
陈美秀
刘学炎
李泽清
寿冬金
莫建松
吴忠标
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Hangzhou Tianlanjing Environmental Protection Technology Co Ltd
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Hangzhou Tianlanjing Environmental Protection Technology Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/30Technologies for a more efficient combustion or heat usage

Abstract

Disappear white device the utility model discloses a kind of for fire coal tail gas desulphurization denitration dedusting, including absorption tower, GGH, concurrent heating room, SCR reactor and the chimney set gradually along flue gas flow direction;The neat stress side-entrance of the exhanst gas outlet access GGH on the absorption tower, the gas inlet of the neat stress side outlet access concurrent heating room of GGH;The exhanst gas outlet of the concurrent heating room accesses the gas inlet of the SCR reactor;The exhanst gas outlet of the SCR reactor accesses the former fume side import of the GGH, and the former fume side outlet of the GGH accesses the chimney.The utility model is according to fire coal tail gas feature, sulfur dioxide and dust are efficiently removed in desulfuration absorbing tower first, then enter SCR denitration system NO_x Reduction by Effective using GGH heating flue gas, finally by GGH heat exchange cooling, smoke temperature is 20~50 DEG C higher than absorption tower outlet smoke temperature, while achieving the purpose that eliminating white smoke.

Description

It is a kind of to disappear white device for fire coal tail gas desulphurization denitration dedusting
Technical field
The present invention relates to smoke gas treatment technical fields, and in particular to a kind of desulphurization denitration dedusting for purifying coal-fired flue gas Disappear white device.
Background technique
With the rapid popularization of Thermal Power Generation Industry minimum discharge, the minimum discharge cry of non-electrical industry is also more more and more intense.Most Nearly ecological environment portion just issues " iron and steel enterprise's minimum discharge retrofit work scheme (exposure draft) ", and " opinion original text " is to pollutant It makes and refers specifically to be denoted as, clear fire coal head flue gas, pellet roasting flue gas emission limit particulate matter, sulfur dioxide, nitrogen oxides are small Hourly value concentration of emission is not higher than 10,35,50 milligrams/cubic metre, other pollution sources particulate matters, sulfur dioxide, nitrogen oxides are small Hourly value concentration of emission is respectively no higher than every cubic metre 10 milligrams, 50 milligrams, 150 milligrams.For above-mentioned policy, steel industry Minimum discharge is changed into extremely urgent.
The difficult point that the post-processing approach of Industrial Boiler coal-fired flue-gas is compared
1) flue-gas temperature is relatively low, while fluctuating larger, and de-sulfurization temperature range is proper, but denitration temperature range is too It is low;
2) flue gas oxygen content is high, has large effect for the desulfurization and denitration process of sintering flue gas;
3) SO under normal circumstances2And NOxConcentration mean concentration is lower, and concentration variation range is bigger, is not sufficiently stable;
4) coal-fired head dust removing effects are generally poor, and dustiness is relatively high in flue gas, while dust viscosity is higher;
5) contain multiple pollutant component in flue gas, mainly there is HCl, HF, CO, dioxin and heavy metal etc., collaboration processing Difficulty it is relatively high.
Since industrial coal flue gas and coal fired boiler of power plant flue gas make a big difference, so directly boiler smoke Desulfurization and method of denitration are applied to sintering flue gas, can lead to the problem of it is very much, for coal-fired denitration.Coal-fired flue-gas Temperature too low and oxygen content it is too high, be difficult directly to apply SCR the SNCR technique denitration of power plant boiler flue gas.
Utility model content
The utility model provide it is a kind of disappear white device for the dedusting of fire coal tail gas desulphurization denitration, various pollutants are removed into skill Art combines, and eliminates white cigarette simultaneously in the requirement for completing minimum discharge.
It is a kind of to disappear white device for fire coal tail gas desulphurization denitration dedusting, including the absorption set gradually along flue gas flow direction Tower, GGH, concurrent heating room, SCR reactor and chimney;The neat stress side-entrance of the exhanst gas outlet access GGH on the absorption tower, GGH's The gas inlet of neat stress side outlet access concurrent heating room;The exhanst gas outlet of the concurrent heating room accesses the flue gas of the SCR reactor Import;The exhanst gas outlet of the SCR reactor accesses the former fume side import of the GGH, the former fume side outlet of the GGH Access the chimney.
The utility model efficiently removes sulfur dioxide and dust according to fire coal tail gas feature in desulfuration absorbing tower first, Then enter SCR denitration system NO_x Reduction by Effective using GGH (Gas Gas Heater, flue gas-smoke re-heater) heating flue gas, Finally by GGH heat exchange cooling, smoke temperature is 20~50 DEG C higher than absorption tower outlet smoke temperature, while achieving the purpose that eliminating white smoke.
GGH, concurrent heating room and SCR reactor itself are this field conventional equipment;Concurrent heating room can be used fuel combustion and add Electric heating or mixed wind and other heating methods also can be used in heat.The inlet temperature of SCR reactor can by GGH and Concurrent heating room is adjusted, and is suitble to the catalyst of low high temperature, can choose catalyst according to practical circumstances.
Preferably, bottom is tower reactor in the absorption tower, sets gradually spray equipment from the bottom to top above tower reactor, tubular type is removed Day with fog, liquid collector and demister, smoke inlet is in the tower wall between tower reactor and spray equipment, exhanst gas outlet is located at absorption Top of tower;The spray equipment includes several layers spray, is connected to tower reactor by circulating pump in addition to top layer spray.
Flue gas enter absorption tower it is de- after, scrubbing CO_2 when first passing around spraying zone, and in top layer spray by changing The cooling slurries of hot device carry out desulfurization and cooling to flue gas simultaneously, then cool by tubular demister and liquid collector, Enter whirlwind high efficiency demister demisting later and cools;Tubular demister removes biggish drop first, then cools down cold But flue gas.By demisting early period of tubular demister, the load of high efficiency demister can be effectively reduced.Absorption is left after flue gas is cooling Tower enters GGH heating, and the flue gas after heating is through the concurrent heating of concurrent heating room, subsequently into SCR reactor, after SCR reactor denitration Cool down into GGH, is discharged in atmosphere after cooling by chimney.Flue gas enters the temperature after GGH cooling than absorption tower outlet temperature It is 20 DEG C high~50 DEG C, white cigarette can not be seen after being discharged to atmosphere by chimney.
In absorption tower using Multi-stage cooling condense, respectively spraying cooling, tubular demister, liquid collector cool with Whirlwind high efficiency demister cools, and it is that cooling water passes through collection that liquid collector, which cools and cools with whirlwind high efficiency demister, Liquid device and whirlwind high efficiency demister inside and flue gas indirect heat exchange.
Spraying cooling can make 1~5 DEG C of flue gas cool-down, and tubular demister can make 1~5 DEG C of flue gas cool-down, and liquid collector can make 1~3 DEG C of flue gas cool-down, the efficient demisting of whirlwind can make 1~10 DEG C of flue gas cool-down, can be according to practical reasonable group of Demand Design of cooling Close cooling device.
The liquid collector can be semicircle or triangle or other spills, divide upper layer and lower layer, by between the upper and lower Away to cope with different boiler loads.
The demister is cyclone demister or wet electrical dust precipitator.
It is further preferred that the number of plies of the cyclone demister is set as 2~5 layers.Whirlwind high efficiency demister, is typically designed 2~5 layers, the specific number of plies is determined according to cooling and dedusting demand.
It is further preferred that condensed water storage tank is arranged outside the absorption tower, it is cold that the discharge outlet of the liquid collector accesses this In condensate storage tank.
Preferably, water water- to-water heat exchanger, the cooling rear slurry outlet access spray of water water- to-water heat exchanger are set outside the absorption tower The top layer of device sprays.
In water water- to-water heat exchanger, slurries to be cooled walk shell side sequence, and refrigerant walks tube side, tower of the slurries to be cooled from absorption tower Kettle, refrigerant may be from air cooling tower, and water water- to-water heat exchanger is for cooling down top layer slurries.Spray equipment except top layer spray in addition to other pass through The bottom tower reactor on circulating pump connection absorption tower.
Preferably, the absorption tower peripheral hardware sets air cooling tower, and the bottom outlet pipe of the tubular demister and demister is outer It is connected to the air cooling tower, the bottom outlet pipe setting branch of the liquid collector simultaneously accesses the air cooling tower, the water outlet of the air cooling tower Mouth accesses the top water inlet pipe of the tubular demister, liquid collector and high efficiency demister.
Cooling water needed for the tubular demister, liquid collector and cyclone demister has source, then only need to be by cooling water The water inlet pipe for accessing described device, no longer needs to air cooling tower.
Compared with prior art, the utility model has the following beneficial effects:
1) after flue gas enters cooling area, successively pass through tube type dust removing, liquid collector and whirlwind high efficiency demister, repeatedly dropping In the process of temperature, steam is condensed out in flue gas, and condensed water is collected re-using.
2) during flue gas condensing, aqueous vapor is condensed by core of the superfine particulate matter in flue gas, superfine particulate matter drop Become larger, capture difficulty reduces, and increases dust removing effects, realizes cooperation-removal ultra-fine grain dust simultaneously in the process of cooling eliminating white smoke With dissolubility salt.
3) disappear white using GGH heat exchange heating, make full use of former flue gas heat source, and without operating cost.
4) after desulfurization and dedusting dehumidifying, using SCR denitration, catalyst poisoning and abrasion is prevented, improves catalyst service life, Operating cost is effectively reduced.
5) present apparatus organically combines various pollutants removal technology, efficient removal particulate matter, sulfur dioxide, nitrogen oxidation Object makes fire coal tail gas reach minimum discharge requirement, meets environmental requirement.
6) present apparatus provides a kind of coal-fired minimum discharge technology, and makes full use of existing equipment to add new function, while real The purpose of existing water-saving eliminating white smoke.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention.
Appended drawing reference as shown in the figure is as follows:
The absorption tower 1- 2- spray equipment 3- tubular demister
4- liquid collector 5- cyclone demister 6-GGH
7- concurrent heating room 8-SCR reactor 9- chimney
10- condenses water storage tank 11- air cooling tower 12- water water- to-water heat exchanger
Specific embodiment
As shown in Figure 1, a kind of disappear white device, including absorption tower 1, GGH6, concurrent heating for coal-burning boiler for flue gas desulfurization, denitration Room 7, SCR reactor 8, chimney 9, condensation water storage tank 10, air cooling tower 11 and water water- to-water heat exchanger 12.
Bottom is tower reactor in absorption tower 1, sets gradually spray equipment 2, tubular demister 3, liquid collecting dress above tower reactor upwards 4 and cyclone demister 5 are set, for smoke inlet in the tower wall between tower reactor and spray equipment, exhanst gas outlet, which is located at, absorbs tower top Portion.
Four layers of spray are arranged in spray equipment in present embodiment, are connected to tower reactor by circulating pump in addition to top layer spray, inhale It receives and water water- to-water heat exchanger 12 is set outside tower, tower reactor inner part slurries are pumped into the water water- to-water heat exchanger, after water water- to-water heat exchanger is cooling again It is sent into top layer spray, realizes top layer spraying cooling.
Tubular demister 3, liquid collector 4 and cyclone demister 5 structure itself are all made of prior art realization, liquid collector It can be semicircle or triangle or other spills, divide upper layer and lower layer, by between the upper and lower away from negative to cope with different boilers Lotus;Cyclone demister is typically designed 2~5 layers, and the specific number of plies is determined according to cooling and dedusting demand.
It is also set up outside absorption tower 1 and condenses water storage tank 10 and air cooling tower 11, the discharge outlet connection two-way branch pipe of liquid collector, one Road branch pipe access condensation water storage tank 10, branch pipe accesses in air cooling tower 11 all the way, condenses the water in water storage tank after generally handling, Can be used as mist eliminator flushing water or desulfurization slurrying water and other.The bottom of tubular demister 3 and cyclone demister 5 row Water pipe also accesses in air cooling tower 11, and the water outlet of air cooling tower is connected to tubular demister 3, liquid collector 4 and whirlwind by water pump In the top water inlet pipe of demister 5, cooling water circulation use.The refrigerant of water water- to-water heat exchanger 12 also comes from air cooling tower, to for pushing up The slurries of layer spray carry out heat exchange cooling, and the cooling water as refrigerant finally returns that air cooling tower.
Exhanst gas outlet accesses the neat stress side-inlet of GGH by flue, and the neat stress side gas outlet after heating through GGH is logical It crosses in flue access concurrent heating room 7, flue gas enters the air inlet of SCR reactor, the outlet of SCR reactor after the concurrent heating of concurrent heating room Mouth accesses the former smoke air inlet of GGH by flue, and flue gas is discharged into chimney 9 after GGH cools down from former flue gas gas outlet.
The process flow of the utility model is as follows:
Flue gas enter absorption tower it is de- after, scrubbing CO_2 when first passing around spraying zone, then by tubular demister and Liquid collector cools, and enters whirlwind high efficiency demister demisting later and cools;Left after flue gas is cooling absorption tower into Enter GGH heating, the flue gas after heating enters after SCR reactor denitration through the concurrent heating of concurrent heating room subsequently into SCR reactor GGH cooling, is discharged in atmosphere after cooling by chimney.
Cooling is condensed into Multi-stage cooling condensation, cools and efficiently removes in tubular demister, liquid collector and whirlwind respectively It realizes in day with fog region.Cooling water pipe is connected with tubular demister, liquid collector with whirlwind high efficiency demister, and cooling water passes through it Device internal circulation heats up in apparatus surface and flue gas indirect heat exchange, and the water after heating is flowed out from bottom of device, is connected to air-cooled Tower is recycled in cooling device after its cooling by pump.
The hot water that cyclone demister and liquid collector are collected is sent into condensation water storage tank, and water, can be with after generally handling As mist eliminator flushing water or desulfurization slurrying water and other, realize water-saving recycling, improve utilization of resources.
Embodiment 1
In certain engineering test, 20 DEG C of environment temperature, relative humidity 69%, 175 DEG C of flue-gas temperature, humidity of flue gas flue gas Flow 14.6%, absorption tower export 58 DEG C of smoke temperature.Utilize technique of the invention, quantity of circulating water 3000m3/ h, 25 DEG C of inlet water temperature, 48 DEG C of exit water temperature, being cooled down by desulfurization fume is 48 DEG C, is discharged through SCR denitration and GGH, and smoke temperature is 75 DEG C, in flue gas 32 milligram/cube of sulfur dioxide when 42.5 milligram/cube of oxide, 2.7 milligram/cube of particulate matter, and can't see white cigarette.
Embodiment 2
In certain engineering test, 25 DEG C of environment temperature, relative humidity 78%, 155 DEG C of flue-gas temperature, humidity of flue gas flue gas Flow 11.3%, absorption tower export 55 DEG C of smoke temperature.Utilize technique of the invention, quantity of circulating water 2500m3/ h, 32 DEG C of inlet water temperature, 47 DEG C of exit water temperature, being cooled down by desulfurization fume is 47 DEG C, is discharged through SCR denitration and GGH, and smoke temperature is 70 DEG C, in flue gas 27 milligram/cube of sulfur dioxide when 38.7 milligram/cube of oxide, 3.3 milligram/cube of particulate matter, and can't see white cigarette.
The foregoing is merely the specific implementation cases of the utility model patent, but the technical characteristic of the utility model patent is simultaneously Not limited to this, in the field of the utility model, made changes or modifications all cover any those skilled in the relevant art Among the scope of the patents of the utility model.

Claims (7)

1. a kind of disappear white device for fire coal tail gas desulphurization denitration dedusting, which is characterized in that including successively being set along flue gas flow direction Absorption tower, GGH, concurrent heating room, SCR reactor and the chimney set;The absorption tower exhanst gas outlet access GGH neat stress side into Mouthful, the gas inlet of the neat stress side outlet access concurrent heating room of GGH;The exhanst gas outlet of the concurrent heating room accesses the SCR reaction The gas inlet of device;The exhanst gas outlet of the SCR reactor accesses the former fume side import of the GGH, the former flue gas of the GGH Side outlet accesses the chimney.
2. disappearing white device for the dedusting of fire coal tail gas desulphurization denitration according to claim 1, which is characterized in that the absorption Bottom is tower reactor in tower, sets gradually spray equipment, tubular demister, liquid collector and demister from the bottom to top above tower reactor, Smoke inlet is in the tower wall between tower reactor and spray equipment, exhanst gas outlet is located at the top of absorption tower;The spray equipment packet Several layers spray is included, tower reactor is connected to by circulating pump in addition to top layer spray.
3. disappearing white device for the dedusting of fire coal tail gas desulphurization denitration according to claim 2, which is characterized in that the absorption Condensed water storage tank is set outside tower, and the discharge outlet of the liquid collector accesses in the condensation water storage tank.
4. disappearing white device for the dedusting of fire coal tail gas desulphurization denitration according to claim 2, which is characterized in that the absorption Water water- to-water heat exchanger, the top layer spray of the cooling rear slurry outlet access spray equipment of water water- to-water heat exchanger are set outside tower.
5. disappearing white device for the dedusting of fire coal tail gas desulphurization denitration according to claim 2, which is characterized in that the absorption Tower peripheral hardware sets air cooling tower, and the bottom outlet pipe of the tubular demister and demister is external to the air cooling tower, the liquid collecting dress The bottom outlet pipe set is arranged branch and accesses the air cooling tower, and the water outlet of the air cooling tower accesses the tubular demister, collection The top water inlet pipe of liquid device and high efficiency demister.
6. disappearing white device for the dedusting of fire coal tail gas desulphurization denitration according to claim 2, which is characterized in that the demisting Device is cyclone demister or wet electrical dust precipitator.
7. disappearing white device for the dedusting of fire coal tail gas desulphurization denitration according to claim 6, which is characterized in that the whirlwind The number of plies of demister is set as 2~5 layers.
CN201821619938.1U 2018-09-30 2018-09-30 It is a kind of to disappear white device for fire coal tail gas desulphurization denitration dedusting Active CN209490656U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021088524A1 (en) * 2019-11-06 2021-05-14 中冶长天国际工程有限责任公司 System and method for denitration of flue gas by carbon monoxide

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021088524A1 (en) * 2019-11-06 2021-05-14 中冶长天国际工程有限责任公司 System and method for denitration of flue gas by carbon monoxide

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