CN206045767U - A kind of flue gas is ultra-clean to discharge desulphurization denitration dust removal integrated plant - Google Patents

A kind of flue gas is ultra-clean to discharge desulphurization denitration dust removal integrated plant Download PDF

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Publication number
CN206045767U
CN206045767U CN201621014021.XU CN201621014021U CN206045767U CN 206045767 U CN206045767 U CN 206045767U CN 201621014021 U CN201621014021 U CN 201621014021U CN 206045767 U CN206045767 U CN 206045767U
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tower
flue gas
layer
ultra
gas
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柴本银
尹凤交
刘涛
赵改菊
邢召良
刘法鑫
刘金勇
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Shandong Tianli Energy Ltd By Share Ltd
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Shandong Tianli Energy Ltd By Share 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
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The utility model discloses a kind of flue gas is ultra-clean to discharge desulphurization denitration dust removal integrated plant, including tower body, the tower body is provided with gas approach and exhanst gas outlet, and, on the lower sides of tower body, exhanst gas outlet is located at the top of tower body for gas approach;Include slurry pool, desulfurization layer, oxide layer, denitration layer, wet static dedusting upwards successively from bottom of towe.Flue gas enters tower body by air inlet, sequentially passes through bottom spraying layer desulfurization, middle part oxide layer, top spraying layer denitration, wet cottrell dedusting, the flue gas of outlet can be made to reach the standard of the ultra-clean discharge of flue gas.This utility model adopts ClO2As oxidizing NO, MgOH is desulfurization denitrification agent, overcome traditional desulfuring and denitrifying apparatus complex structure, the shortcoming of removal effect difference, by the way of tower top installs wet cottrell, realize the subparticle successively removed successively in same device in flue gas, the formation of " gypsum rain " can be effectively prevented, the purification efficiency to flue gas is improve.

Description

A kind of flue gas is ultra-clean to discharge desulphurization denitration dust removal integrated plant
Technical field
This utility model is related to gas cleaning processing technology field, more particularly to a kind of ultra-clean discharge desulphurization denitration of flue gas is removed Dirt integrated apparatus.
Background technology
With coal as main primary energy, the main Land use systems of current coal in China are directly burnings, huge for China Coal-fired capacity causes SO2、NOx, the discharge such as dust considerably beyond the self-purification ability of enviroment, cause many areas of China in serious coal smoke Type atmospheric pollution.With society development, emission control pay attention to day by day of the people to these pollution that caused by coal burning things, by dedusting by Step increases to desulphurization and denitration.At present, coal electricity Green Development new direction is " near-zero release ", " ultra-clean discharge ".
As coal-burning power plant's air pollution control technique is by past dedusting, the single formula control of desulphurization and denitration, progressively to Conventional pollution and removing heavy metal and the integrative coordinated control technology development of aerosol even depth, realize atmosphere pollution super It is net to discharge.For " ultra-clean discharge ", power plant mainly adopts efficient cooperation-removal technology, further to denitration, desulfurization, dust pelletizing system Renovation and improving, explores the prioritization scheme of " ultra-clean discharge ":Such as using setting up alloy support in double tower Two-way Cycle, single column Two-way Cycle, tower The skill upgrading such as disk desulfuration efficiency reduces sulfur dioxide (SO2) emissions, by the multiple technologies such as low-NO_x combustion technology (LNB), SCR, SNCR Discharged nitrous oxides are reduced, with cold precipitator, efficient power, desulfurization tail smoke device for deep cleaning, wet electrical dust precipitator Soot emissions are reduced etc. technology.Although the effect of this technology removing pollutant is good, complex process, control condition are harsh, Investment and operating cost are expensive, medium-high sulfur coal bad adaptability, therefore, carry out the multiple pollutant cooperation-removal technology of low energy consumption, Ultra-clean discharge is realized, contributes to solving the problems, such as pollution that caused by coal burning environment.
At present, multiple pollutant cooperation-removal technology can be divided into two big class of dry and wet, and dry process mainly has electricity Beamlet method, activated carbon method, impulse electric corona method and CuO methods etc..Wet processing has oxidation absorption process, Absorption via Chemical Complexation, reducing process etc.. Dry process denitration efficiency is low, if can be transformed on the basis of original wet desulfurizing process, develops a kind of wet method same When desulphurization denitration new technology, substantial amounts of technological transformation and treatment cost will be saved, and there is no catalyst poisoning, inactivation etc. Problem, to realizing that comprehensive control pollution that caused by coal burning thing has important practical significance.
Flue gas is mainly first passed through strong oxidizing property ring based on oxidative absorption method by the technique of wet method simultaneous SO_2 and NO removal NO is oxidized to NO by border2, then with alkali liquor absorption, the oxidant of employing mainly has HClO3(NaClO2)、O3、H2O2And KMnO4Deng, Absorbing liquid is NaOH, MgOH etc..The subject matter of presence is NOxOxidation efficiency it is low, or operating cost is high, the master of urgent need to resolve Problem is wanted to be to try to improve NOxOxidation efficiency, reduce system operating cost.
Patent of invention (201510552281.6) discloses a kind of single column oxidation sweetening denitrification apparatus and its desulphurization denitration side Method, the invention along flue gas flow direction be followed successively by from bottom to top absorbent pond, lower absorbent system, oxidative system, separating system with And top absorption system, remove SO2Flue gas afterwards enters oxidative system, and then removes NOx.The invention is using ozone as oxidation Agent, generally, the temperature of former flue gas is higher than 100 DEG C, and at this temperature, the half-life of ozone decomposed is very short, NOxOxidation Efficiency is very low, and the denitration efficiency for directly resulting in device is relatively low.
In addition, the system lower absorbent system, having separating system to increase system between oxidative system, top absorption system Resistance, so as to increase the power consumption of blower fan, pump, increase system operation cost.
Invention (201310128263.6) discloses a kind of flue-gas dust-removing and desulfurization denitrification integrated device, and the patent includes cigarette Gas input channel, electrostatic fabric filter, desulphurization denitration tower, ammonia supply pump and denitrfying agent feed system etc., using described in the invention Flue gas electric bag dust, wet-type ammonia and desulfurizing agent oxidation and denitration can be carried out to the flue gas that industrial coal system is produced effectively. The present invention has that oxidation efficiency is low using oxidizing gas oxidation NO, ammonia as desulphurization denitration absorbent, and denitration efficiency is low, fortune Row is costly, the technical problem such as the escaping of ammonia is big.
Invention (201410038192.5) discloses a kind of boiler flue gas desulfurization, denitration, demercuration integrated purifying equipment, should Patent is provided with flue gas flow guiding device at gas approach, and demercuration denitration liquid spray equipment is provided with the top of which, and demercuration denitration liquid is adopted Hydrogen peroxide, spray desulphurization denitration liquid adopt magnesium oxide solution or calcium oxide solution or paper white sludge slurry.There is oxidation effect in the invention Rate is low, and denitration efficiency is low, the technical problem such as operating cost height.
In a word, there is problems with existing desulphurization denitration technology at present:The generating process energy consumption of ozone is big, high cost, And the half-life of ozone decomposed is very short, NOxOxidation yield it is very low, which suppress ozonation technology further genralrlization should With;Hydrogen peroxide oxidation wet desulphurization denitration there is also that oxidation efficiency is low, the problem that operating cost is high.
Utility model content
The purpose of this utility model is to provide a kind of has that little floor space, investment and operating cost is low, desulphurization denitration is removed The ultra-clean discharge desulphurization denitration dust removal integrated plant of flue gas of the advantages of dirt efficiency high, simple structure, succinct system, it is possible to achieve The ultra-clean discharge of flue gas:Smoke dust discharge concentration≤5mg/m3, SO2Concentration of emission≤35mg/m3And NOxConcentration of emission≤50mg/m3
For achieving the above object, this utility model is adopted the following technical scheme that:
A kind of flue gas is ultra-clean to discharge desulphurization denitration dust removal integrated plant, including tower body, and the tower body is provided with flue gas and enters Mouth and exhanst gas outlet, on the lower sides of tower body, exhanst gas outlet is located at the top of tower body for gas approach;From bottom of towe upwards according to It is secondary including slurry pool, desulfurization layer, oxide layer, denitration layer, wet static dedusting;Flue gas enters tower body by air inlet, sequentially passes through The desulfurization layer desulfurization of bottom, the oxide layer oxidation at middle part, the denitration layer denitration on top, wet cottrell dedusting, can use The flue gas of mouth reaches the standard of the ultra-clean discharge of flue gas.
Preferably, spray void tower of the tower body for cylindrical structural, described tower body inner wall anti-corrosive adopt glass flake, Inner horizontal is provided with two-layer spraying layer, wherein the spraying layer positioned at bottom is desulfurization layer, superposed spraying layer is denitration layer.
Preferably, described oxide layer uses ClO2Gas is aoxidized, and chlorine dioxide is entered by gas generator Enter the middle part of tower body.
Preferably, described denitration layer and desulfurization layer use the denitration of MgOH solution or desulfurization, and MgOH solution leads to Crossing pump to be driven in the bottom slurry pond of absorption tower, then be pumped to absorption tower spray equipment by circulation carries out spray-absorption.
Preferably, demister and back purge system are set above the spraying layer, demister exiting flue gas humidity is not More than 75mg/Nm3(butt).
Preferably, the gradient of described tower body bottom surface is not less than 5%, is provided with discharge outlet along slope aspect.
Preferably, mainly by Sprayer Circulation pump, swirl nozzle, circulating line and valve composition is described for the spraying layer Sprayer Circulation pump be arranged in slurry pool, which is passed through circulating line and is connected with the swirl nozzle in the tower body, and is being followed Endless tube is provided with valve on road.
This utility model adopts ClO2Used as oxidizing NO, MgOH is desulfurization denitrification agent, overcomes traditional desulfurization and takes off Nitre apparatus structure is complicated, the shortcoming of removal effect difference, by the way of tower top installs wet cottrell, realizes desulfurization and takes off The integration of nitre dedusting, makes flue gas reach the standard of ultra-clean discharge.
This utility model has the characteristics that and beneficial effect compared with prior art:
(1) adopt ClO2Used as oxidant, MgOH is desulfurization denitrification agent, overcomes that the de- denitration the escaping of ammonia of ammonia process is serious to ask Topic, oxidation are high, and removal effect is good;
(2) oxidative system is arranged between top spray system and bottom spray system, and is eliminated between layers Separating system, had both reduced ClO2Consumption improve denitration efficiency again, reduce system pressure drop again, reduce operating cost;
(3) tower top installs wet cottrell, effectively prevents the formation of " gypsum rain ", simplifies technological process, realizes Desulphurization denitration is dust removal integrated.
In sum, this utility model be with floor space is little, investment and operating cost is low, desulphurization denitration efficiency of dust collection The ultra-clean discharge desulphurization denitration dust removal integrated plant of flue gas of the advantages of height, simple structure, succinct system and its technique, Ke Yishi The ultra-clean discharge of existing flue gas.
Description of the drawings
Fig. 1 is the structural representation of this utility model specific embodiment.
Wherein, 1. tower body, 2. demister, 3. wet cottrell, 4. top spraying layer, 5. middle part oxide layer, 6. under Portion's spraying layer, 7. slurry pool, 8. gas approach, 9. exhanst gas outlet.
Specific embodiment
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.
At present, flue gas is mainly first passed through Strong oxdiative based on oxidative absorption method by the technique of wet method simultaneous SO_2 and NO removal NO is oxidized to NO by property environment2, then with alkali liquor absorption, the oxidant of employing mainly has HClO3(NaClO2)、O3、H2O2With KMnO4It is NaOH, MgOH etc. Deng, absorbing liquid;And this utility model is in order to solve NOxOxidation efficiency it is low, or operating cost is high Problem, by chlorine dioxide (ClO2) oxidant the most of the present utility model, it is specific as follows:
Chlorine dioxide (ClO2) be a kind of yellow green to orange-yellow gas, be known as in the world it is safe and nontoxic green Color disinfectant, with very strong oxidisability, it be mainly used for sterilize, bleach, it is deodorization, sterilization, fresh-keeping.Chlorine dioxide be with Sodium chlorate, concentrated sulphuric acid are raw material, and hydrogen peroxide or methanol are obtained for reducing agent, now need to be made with existing.Due to unstable chemcial property palpus Matching while using, it is suppressed which is used for the industrial application of desulphurization denitration.Due to the progress of science and technology, chlorine dioxide generator is solved The difficult problem of its transport, but not yet find using chlorine dioxide (ClO in flue gas desulfurization and denitrification field at present2) as oxidant Technology, this utility model novelty by chlorine dioxide (ClO2) apply in the technique of desulphurization denitration, it is specific as follows:
The utility model proposes flue gas desulfurization nitre system it is as follows:
In FIG, the ultra-clean discharge desulphurization denitration dust removal integrated plant of flue gas, including tower body 1, the tower body 1 are provided with Gas approach 8 and exhanst gas outlet 9, on the lower sides of tower body 1, exhanst gas outlet 9 is located at the top of tower body 1 for gas approach 8; Include slurry pool 7, bottom spraying layer 6 (desulfurization layer), middle part oxide layer 5, the 4 (denitration of top spraying layer upwards successively from bottom of towe Layer), wet static dedusting 3.Flue gas enters tower body 1 by air inlet 8, sequentially passes through bottom spraying layer 6 (desulfurization layer) desulfurization, middle part Oxide layer 5, top spraying layer 4 (denitration layer) denitration, 3 dedusting of wet cottrell, make the flue gas of outlet reach flue gas ultra-clean The standard of discharge.
Oxidative system is arranged between top spray system and bottom spray system, and eliminates separation between layers System, had both reduced ClO2Consumption improve denitration efficiency again, reduce system pressure drop again, reduce operating cost;
Tower top installs wet cottrell, effectively prevents the formation of " gypsum rain ", simplifies technological process, realizes de- Sulfur denitration dust collecting integral.
Tower body 1 is spray void tower, and column construction, absorption tower inner wall anti-corrosive adopt glass flake, inside set two-layer spraying layer, point For upper and lower two spraying zones.In tower lower floor spraying zone 6, SO in flue gas2Washed and reacted therewith by MgOH solution, at middle part NO in oxide layer flue gas is oxidized agent ClO2Oxidation, the NO in the spraying zone flue gas of upper strata2Washed and sent out therewith by MgOH solution Raw reaction, reacts magnesium sulfate, the magnesium nitrate for generating, is left to tower bottom slurry pool 7, is directly discharged into main plant area by discharge pipe, its The slurry pool 7 of bottom is overall structure with tower body 1;Absorption tower floor design can be emptied completely serosity, and the bottom of towe gradient is not less than 5%, slope aspect discharge outlet.
The oxidant of above-mentioned oxide layer be chlorine dioxide by oxidation of nitric oxide into nitrogen dioxide, desulphurization denitration absorbent is Magnesium hydroxide alkali liquor, chlorine dioxide enter the middle part of tower body by gas generator, and absorbent alkali liquor is driven into by pump In the bottom slurry pond of absorption tower, then it is pumped to absorption tower spray equipment and carries out spray-absorption by circulation.Using ClO2As oxygen Agent, MgOH are desulfurization denitrification agent, overcome the serious problem of the de- denitration the escaping of ammonia of ammonia process, and oxidation is high, and removal effect is good;
Mainly by Sprayer Circulation pump, swirl nozzle, circulating line and valve composition, circulating pump is centrifugal impeller to spraying layer Pump (centrifugal without blocking), arranges side-feeding mixer on the slurry pool, effect is to make serosity keep flow regime, so that Desulphurization denitration active substance therein keeps even suspension state, it is ensured that serosity is to SO2、NOxReaction, absorbability;Circulation pipe Road adopts high-quality FRP GRP pipe, is made up of inner liner, structure sheaf and three part of external protection, and inner liner adopts vinyl Resin, inner liner and external protection reduce pipe fitting abrasion operationally, it is ensured that do not tie inside shower added with wear resistant filler Dirt.
Demister and back purge system are set above the tower body spraying layer, and demister exiting flue gas humidity is not more than 75mg/Nm3(butt).
The electrostatic precipitator is mainly made up of corona wire (negative electrode), receiving electrode (anode), insulated case and power supply.
A kind of ultra-clean technique for discharging desulphurization denitration dust removal integrated plant of flue gas, comprises the following steps:
(1) flue gas is entered in tower by gas approach by flue, first passes around air-distribution device into bottom spraying layer (desulfurization Layer), SO in flue gas2Washed and reacted therewith by MgOH solution, absorb SO therein2Flue gas enters oxide layer afterwards;
(2) ClO produced in oxide layer gas generator2It is fully contacted with flue gas, the NO in flue gas is oxidized to NO2, cigarette Gas enters top spraying layer (denitration layer);
(3) flue gas is further acted on the MgOH solution of spray in top spraying layer, removes NO2, into tower body top;
(4) Jing after demister removes droplet, the wet static dedusting device into top of tower is removed the cleaning flue gases after denitration Dirt, after flue gas reaches the standard of ultra-clean discharge, Jing chimneys enter air.
In the step (2), (4), the desulphurization denitration absorbing liquid is MgOH, and the concentration of MgOH solution is 5~20% (matter Amount ratio), the absorbing liquid of 70%~90% (volume) is extracted out from tower bottom and is returned in tower, and remaining is directly discharged into main factory by discharge pipe Area.
According to the change of pH value, control magnesium sulfate serosity, the discharge of magnesium nitrate serosity, the addition of magnesium hydroxide solution and Control to defroster cleaning apparatus.
It is although the above-mentioned accompanying drawing that combines is described to specific embodiment of the present utility model, not new to this practicality The restriction of type protection domain, one of ordinary skill in the art should be understood that on the basis of the technical solution of the utility model, ability Various modifications or deform still in protection model of the present utility model that field technique personnel are made by need not paying creative work Within enclosing.

Claims (7)

1. a kind of flue gas is ultra-clean discharges desulphurization denitration dust removal integrated plant, it is characterised in that including tower body, set on the tower body There are gas approach and exhanst gas outlet, on the lower sides of tower body, exhanst gas outlet is located at the top of tower body for gas approach;From tower Bottom includes slurry pool, desulfurization layer, oxide layer, denitration layer, wet static dedusting upwards successively;Flue gas enters tower body by air inlet, Sequentially pass through the desulfurization layer desulfurization of bottom, the oxide layer oxidation at middle part, the denitration layer denitration on top, wet cottrell to remove Dirt, can make the flue gas of outlet reach the standard of the ultra-clean discharge of flue gas.
2. flue gas as claimed in claim 1 is ultra-clean discharges desulphurization denitration dust removal integrated plant, it is characterised in that the tower body For the spray void tower of cylindrical structural, described tower body inner wall anti-corrosive adopts glass flake, inner horizontal to be provided with two-layer spraying layer, Spraying layer wherein positioned at bottom is desulfurization layer, and superposed spraying layer is out of stock layer.
3. flue gas as claimed in claim 1 or 2 is ultra-clean discharges desulphurization denitration dust removal integrated plant, it is characterised in that described Oxide layer use ClO2Gas is aoxidized, and chlorine dioxide enters the middle part of tower body by gas generator.
4. flue gas as claimed in claim 3 is ultra-clean discharges desulphurization denitration dust removal integrated plant, it is characterised in that described is de- Nitre layer and desulfurization layer use the denitration of MgOH solution or desulfurization, and MgOH solution is driven into absorption tower bottom slurry by pump In pond, then it is pumped to absorption tower spray equipment and carries out spray-absorption by circulation.
5. flue gas as claimed in claim 4 is ultra-clean discharges desulphurization denitration dust removal integrated plant, it is characterised in that the spray Layer top arranges demister and back purge system, and demister exiting flue gas humidity is not more than 75mg/Nm3Butt.
6. flue gas as claimed in claim 1 is ultra-clean discharges desulphurization denitration dust removal integrated plant, it is characterised in that described tower The gradient of body bottom surface is not less than 5%, is provided with discharge outlet along slope aspect.
7. flue gas as claimed in claim 2 is ultra-clean discharges desulphurization denitration dust removal integrated plant, it is characterised in that the spray Mainly by Sprayer Circulation pump, swirl nozzle, circulating line and valve composition, described Sprayer Circulation pump are arranged on slurry pool to layer Interior, which is passed through circulating line and is connected with the swirl nozzle in tower body, and valve is provided with circulating line.
CN201621014021.XU 2016-08-31 2016-08-31 A kind of flue gas is ultra-clean to discharge desulphurization denitration dust removal integrated plant Active CN206045767U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106237814A (en) * 2016-08-31 2016-12-21 山东天力能源股份有限公司 A kind of flue gas ultra-clean discharge desulphurization denitration dust removal integrated plant and technique thereof
CN108771967A (en) * 2018-06-22 2018-11-09 山东瑞嘉通风环保科技有限公司 A kind of technique of the ultra-clean processing flue gas of the dust removal integrated wet method of desulphurization denitration

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106237814A (en) * 2016-08-31 2016-12-21 山东天力能源股份有限公司 A kind of flue gas ultra-clean discharge desulphurization denitration dust removal integrated plant and technique thereof
CN108771967A (en) * 2018-06-22 2018-11-09 山东瑞嘉通风环保科技有限公司 A kind of technique of the ultra-clean processing flue gas of the dust removal integrated wet method of desulphurization denitration

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Denomination of utility model: Device for integrating ultra-clean emission, desulfurization, denitrification and dedusting of flue gas and process of device

Effective date of registration: 20190225

Granted publication date: 20170329

Pledgee: Qilu Bank of Limited by Share Ltd

Pledgor: Shandong Tianli energy Limited by Share Ltd

Registration number: 2019370000031