CN1382529A - Self-drying corona discharge process and equipment for cleaning fume - Google Patents

Self-drying corona discharge process and equipment for cleaning fume Download PDF

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Publication number
CN1382529A
CN1382529A CN02110142A CN02110142A CN1382529A CN 1382529 A CN1382529 A CN 1382529A CN 02110142 A CN02110142 A CN 02110142A CN 02110142 A CN02110142 A CN 02110142A CN 1382529 A CN1382529 A CN 1382529A
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China
Prior art keywords
corona discharge
flue gas
ammonium salt
pole plate
drying tower
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CN02110142A
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Chinese (zh)
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CN1186113C (en
Inventor
姜雨泽
沈竞为
齐达立
孙树敏
山乐胜
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山东中实股份有限公司
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Priority to CNB021101426A priority Critical patent/CN1186113C/en
Publication of CN1382529A publication Critical patent/CN1382529A/en
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Publication of CN1186113C publication Critical patent/CN1186113C/en

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    • Y02A50/2344
    • Y02A50/2349

Abstract

A semi-dry corona discharge process for cleaning fume includes introducing the high-temp fume containing SO2 and NOx to spray drying tower, moistening while cooling, introducing it to corona discharge equipment, applying high voltage while introducing ammonia gas, corona discharging to generate strong oxidizing free radicals to trigger chemical reactor for converting SO2 and NOx to ammonium salt particles, separating said particles from fume, exhausting fume, collecting said particles on plate electrode, washing the plate electrode with water, and spraying the washing water into spray drying tower fow generating bigger particles to be recovered.

Description

Self-drying corona discharge flue gas purifying method and device

Technical field

The present invention relates to a kind of corona discharge and purify SO in the flue gas 2And NO xMethod and apparatus.

Background technology

Along with expanding economy, consumption of fossil fuels such as coal and oil sharply increase, the SO that its burning produces 2, NO xDeng having caused serious air pollution, people are always in continuous more advanced, the more economical removal methods of discovery techniques.The eighties, people have proposed corona discharge pulse low temperature plasma flue gases purification, academic meeting of calendar year 2001 the 9th national electric precipitation and the 1st national desulfurization academic meeting paper " impulse electric corona plasma flue gas desulphurization industry test device " introduced a kind of pulsed discharge flue gas desulfurization technique scheme, whole technical process is a dry type, adopt the power supply of ns level burst pulse, apply the voltage height, the corona energy consumption is higher.In addition, because the product particle is tiny, flue gas has carried out humidification again, in corona discharge reactor and product collection electric precipitation, easily cause pole plate bonding phenomenon, influence reactor and product and collect the power supply of electric precipitation, reduce desulfurization, denitration and product collecting effect, even flue gas purification system can not be moved by continous-stable.

Summary of the invention

Purpose of the present invention just provides a kind of corona discharge purification flue gas SO that improves desulfuration efficiency, cuts down the consumption of energy, solves the product adhesion problem 2And NO xMethod and device.

The technical scheme that the present invention solves its technical problem employing is to have invented a kind of self-drying corona discharge flue gas purifying method, utilizes ammonia injection and high-voltage corona discharge, spray drying, with SO 2And NO xBe converted into ammonium salt, and reclaimed, be used as chemical fertilizer.May further comprise the steps: flue gas is introduced the humidifying cooling spray drying tower, flue gas is cooled between the saturated adiabatic temperature to 80 of flue gas ℃, smoke moisture is increased within 5~15% scopes; Flue gas behind the humidifying cooling enters the corona discharge flue gas cleaner, adds ammonia simultaneously, is applied with high voltage, and the corona streamer-discahrge takes place, and forms low temperature plasma in the flue gas atmosphere, produces strong oxidizing property free radical O, OH, HO 2Deng, the reaction that these free radicals cause is under the condition that has ammonia to participate in, with SO 2Finally be converted into micron-sized solid ammonium salt particle with NOx, rely on static capture effect, the ammonium salt particle is separated from air-flow, collect on the pole plate, flue gas after being purified is through smoke stack emission; Its characteristics are, supply water for corona discharge flue gas cleaner pole plate, form moisture film on pole plate, clean the product ammonium salt of collecting, and cleaning fluid flows into hopper from the clarifier bottom, recycles; Extract a part of product ammonium salt solution and spray into the humidifying cooling spray drying tower, water evaporates is used for the flue gas humidifying cooling on the one hand, and the bigger solid ammonium salt particle of the dry formation of droplet evaporation is simultaneously reclaimed.

Realize a kind of self-drying corona discharge smoke eliminator of said method, comprise a humidifying cooling spray drying tower and the corona discharge flue gas cleaner that is connected by flue.The humidifying cooling spray drying tower is with SO 2And NO xThe purified product ammonium salt solution is separated into droplet, introduce flue gas by the rotation of drying tower top simultaneously, droplet mixes generation mass-and heat-transfer process with flue gas, and evaporative crystallization becomes the solid particle of 30~120 μ m, with in the air-flow rotary course under inertial separation and action of gravity, separate from drying tower bottom.In product solution droplet evaporation drying, make the flue gas humidifying cooling.The atomizing of product solution can be adopted pressure atomizer, also can adopt rotary atomizer, or pneumatic atomizer.

The corona discharge flue gas cleaner has the desulphurization denitration chemical reaction of generation and the dual work of collecting reaction product.To introduce clarifier through the flue gas of humidifying cooling, add ammonia, apply high voltage simultaneously, under corona discharge oxidation and ammonia synergy, SO by Ammonia adding System 2And NO xBe converted into the ammonium salt aerosol particle, the product particle is charged by the ion that corona discharge produces, and under electrostatic force, is collected on the pole plate, thereby realizes gas cleaning.Electrode structure can adopt line-board-like, also can adopt line-cartridge type.Power supply can be adopted high voltage sourcies such as direct current, DC stacked interchange, high frequency, pulse.Be characterized in, below the corona discharge clarifier, arrange a hopper, there is a solution feed pump therefrom to extract solution and delivers to the water-locator that is installed in corona discharge clarifier top through pipeline, water-locator has nozzle or overflow launder to supply water to corona discharge clarifier pole plate, form moisture film at polar board surface, clean the product ammonium salt of collecting on the pole plate, cleaning fluid flows into hopper from corona discharge flue gas cleaner bottom, recycles.Solution feed pump is delivered to the humidifying cooling spray drying tower as flue gas humidifying cooling medium with a part of reaction product solution, finishes the product evaporation drying simultaneously, and granulation is reclaimed.

The invention has the beneficial effects as follows: adopt wet type moisture film wash products, can improve the out-phase reagentia in pulsed discharge desulfurization, the denitration; SO 2, NO xAnd NH 3Under the corona wind effect, move to pole plate with air-flow, be dissolved in moisture film, further remove reaction; Solved the product adhesion problem; Reactor pole plate, polar curve cleaning, electric power system is stable, and discharged condition is good; Product collection efficiency height can reduce the purifier size; Reduce ammonia and product ammonium salt and efflux, avoid producing secondary pollution; In product solution spray dry run, droplet and flue gas mass transfer effect are good, oxygen and SO 2, NO xCan enter in the droplet liquid film, oxygen dissolution helps the ammonium sulfite in the product is converted into the sulphur ammonium, and direct desulfurization, denitration chemical reaction also can take place simultaneously stable product.In sum, desulfurization provided by the invention, method of denitration can improve purification efficiency, reduce energy consumption, improve operational reliability.On economic index, can dwindle the purifier size, reduce the power supply rank, reduce the power supply cost, thereby reduce desulfurization investment and operating cost.

Description of drawings

Accompanying drawing 1 is the flow chart of technical solution of the present invention, and wherein, 1 is the humidifying cooling spray drying tower, and 2 is the spray drying tower solution feed pump, and 3 are the ammonification nozzle, and 4 is water pipe, and 5 is hopper, and 6 is the corona discharge flue gas cleaner, and 7 is the clarifier solution feed pump.

Accompanying drawing 2 is wet type moisture film wash products circulatory system schematic diagrames, and wherein, 8 is pipeline, and 9 for forming the water-locator of moisture film, and 10 is corona discharge clarifier pole plate.

Concrete case study on implementation

Below in conjunction with accompanying drawing, the invention process technical scheme is described further.

Contain SO 2And NO xHigh-temperature flue gas enter humidifying cooling spray drying tower (1) from top inlet, adopt the pressure atomization mode to spray into atomized drop, make flue-gas temperature reduce to 60~80 ℃, humidity increases to about 10%.Flue gas enters corona discharge flue gas cleaner (6) then, and clarifier has 4 electric fields, adopts the line plank frame, with die opening 300mm, at the clarifier inlet, presses NH by ammonification nozzle (3) 3With SO 2Stoichiometric proportion added ammonia a little less than 1: 1, and preceding two electric fields of clarifier (6) apply ns level 100~125kV pulse high-voltage, and latter two electric field applicator adds 50~70kV direct voltage, and the pulsing corona discharge is with SO 2And NO xBe converted into the ammonium salt particle, and capture, the clean flue gas after the purification enters atmosphere through chimney.Hopper (5) is set below the corona discharge clarifier, solution feed pump (7) is evacuated to the water-locator (9) that is located at clarifier top with water wherein through pipeline (8), the nozzle of water-locator (9) is sprayed to pole plate, go up the formation moisture film at pole plate (10), moisture film flows downward, and product is dissolved in the moisture film, flows into hopper (5) with moisture film, cleaning fluid is got on the corona discharge clarifier (6) with solution feed pump (7) again, recycles.Drying tower solution feed pump (2) extracts part product cleaning liquid and delivers to humidifying cooling spray drying tower (1) from hopper (5), the atomization and vaporization drying forms bigger ammonium salt product particle, takes out from the drying tower bottom, is used as chemical fertilizer.

Claims (2)

1. self-drying corona discharge flue gas purifying method may further comprise the steps:
A. high-temperature flue gas is introduced the humidifying cooling spray drying tower, flue-gas temperature is reduced between the saturated adiabatic temperature to 80 ℃, smoke moisture increases to 5~15%;
B. the flue gas behind the humidifying cooling is introduced the corona discharge flue gas cleaner, add ammonia simultaneously, apply high voltage, the corona streamer-discahrge takes place, produce the strong oxidizing property free radical, the chemical reaction that free radical causes is with SO 2And NO xBe converted into ammonium salt, ammonium salt is being trapped under the effect of electrostatic force on the pole plate (or pipe);
It is characterized in that:
C. supply water to corona discharge clarifier pole plate (or pipe), go up at pole plate (or pipe) and form moisture film, clean the ammonium salt of collecting on the pole plate, cleaning fluid flows into hopper from corona discharge clarifier bottom, recycles;
D. extract part product ammonium salt solution from hopper, spray into the humidifying cooling spray drying tower, be used for the flue gas humidifying cooling on the one hand, evaporation drying forms big ammonium salt particle simultaneously, is reclaimed.
2. device of implementing the described method of claim 1, it comprises a humidifying cooling spray drying tower and the corona discharge flue gas cleaner that is connected by flue, it is characterized in that: below the corona discharge clarifier, arrange a hopper, there is a solution feed pump therefrom to extract solution and delivers to the water-locator that is installed in corona discharge clarifier top through pipeline, water-locator nozzle or overflow launder supply water to corona discharge clarifier pole plate, form the cleaning moisture film at polar board surface, clean the product ammonium salt of collecting on the pole plate, cleaning fluid flows into hopper from corona discharge clarifier bottom, recycles.Solution feed pump has pipeline to be connected to the humidifying cooling spray drying tower in addition.
CNB021101426A 2002-04-01 2002-04-01 Self-drying corona discharge process and equipment for cleaning fume CN1186113C (en)

Priority Applications (1)

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CN1186113C CN1186113C (en) 2005-01-26

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1906822B (en) * 2004-02-09 2010-07-14 大金工业株式会社 Electric discharge device and air cleaner
CN102814113A (en) * 2012-08-13 2012-12-12 河南绿源新星环保设备有限公司 Novel semi-dry ammonia desulfurization process
CN103028299A (en) * 2011-10-06 2013-04-10 安城精机株式会社 Simultaneous complex treatment apparatus for advanced treatment of mixed exhaust gas
CN105268309A (en) * 2015-12-04 2016-01-27 杭州杭联热电有限公司 Semi-dry method pulse plasma flue gas purification system
CN105396441A (en) * 2015-10-28 2016-03-16 山西晋浙环保科技有限公司 Low-temperature economizer and bipolar high-voltage streamer corona discharge combined smoke cleaning method
CN105833718A (en) * 2016-04-14 2016-08-10 中国石油大学(北京) Denitration system and denitration processing method of plasma synergistic catalyst
CN106215697A (en) * 2016-08-26 2016-12-14 江苏中圣高科技产业有限公司 A kind of ammonia process combined desulfurization and denitration method and device of loaded ionic liquid body catalyst
CN107233785A (en) * 2016-03-29 2017-10-10 苏州迈沃环保工程有限公司 The method and system of exhuast gas desulfurization denitration are carried out using super-pressure low temperature plasma
CN108745642A (en) * 2018-06-21 2018-11-06 明光瑞泰工业有限公司 A kind of oil fume purifier with heat sink
CN109821655A (en) * 2019-01-29 2019-05-31 湖南大学 A kind of electrostatic dust-removing device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101716463B (en) * 2010-01-05 2012-07-04 浙江大学 Simultaneous removing device and method of various pollutants by electrocatalytical oxidation combining lime-gypsum method

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1906822B (en) * 2004-02-09 2010-07-14 大金工业株式会社 Electric discharge device and air cleaner
CN103028299A (en) * 2011-10-06 2013-04-10 安城精机株式会社 Simultaneous complex treatment apparatus for advanced treatment of mixed exhaust gas
CN102814113A (en) * 2012-08-13 2012-12-12 河南绿源新星环保设备有限公司 Novel semi-dry ammonia desulfurization process
CN105396441A (en) * 2015-10-28 2016-03-16 山西晋浙环保科技有限公司 Low-temperature economizer and bipolar high-voltage streamer corona discharge combined smoke cleaning method
CN105268309A (en) * 2015-12-04 2016-01-27 杭州杭联热电有限公司 Semi-dry method pulse plasma flue gas purification system
CN107233785A (en) * 2016-03-29 2017-10-10 苏州迈沃环保工程有限公司 The method and system of exhuast gas desulfurization denitration are carried out using super-pressure low temperature plasma
CN105833718A (en) * 2016-04-14 2016-08-10 中国石油大学(北京) Denitration system and denitration processing method of plasma synergistic catalyst
CN106215697A (en) * 2016-08-26 2016-12-14 江苏中圣高科技产业有限公司 A kind of ammonia process combined desulfurization and denitration method and device of loaded ionic liquid body catalyst
CN108745642A (en) * 2018-06-21 2018-11-06 明光瑞泰工业有限公司 A kind of oil fume purifier with heat sink
CN109821655A (en) * 2019-01-29 2019-05-31 湖南大学 A kind of electrostatic dust-removing device

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