CN102274680A - Steamer discharge ammonia flue gas desulfurization, denitration and demisting integrated method - Google Patents

Steamer discharge ammonia flue gas desulfurization, denitration and demisting integrated method Download PDF

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Publication number
CN102274680A
CN102274680A CN2011102068147A CN201110206814A CN102274680A CN 102274680 A CN102274680 A CN 102274680A CN 2011102068147 A CN2011102068147 A CN 2011102068147A CN 201110206814 A CN201110206814 A CN 201110206814A CN 102274680 A CN102274680 A CN 102274680A
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flue gas
streamer
discahrge
denitration
ammonia
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刘勇
胡小吐
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Guangdong Jiade Environmental Protection Technology Co Ltd
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Guangdong Jiade 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
    • 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 invention discloses a steamer discharge ammonia flue gas desulfurization, denitration and demisting integrated method. The integrated method comprises the following steps of: 1) dedusting boiler flue gas containing sulfur dioxide and nitric oxide and feeding the flue gas in a streamer discharge denitration reactor; 2) introducing the flue gas in the streamer discharge denitration reactor into a desulfurizing tower, and discharging the flue gas through a top outlet of the desulfurizing tower; and 3) demisting and purifying the flue gas discharged through the top outlet of the desulfurizing tower by using an electric demister and discharging the flue gas through a chimney. By the method, desulfurization and denitration are performed simultaneously, the demisting efficiency is high, ammonia escape is effectively suppressed, ammonium salt entrainment is eliminated, ammonia loss is reduced, smoke discharge turbidity at the outlet is reduced, corrosion on a tail flue and the chimney are reduced, and a nitrogen fertilizer byproduct is produced.

Description

Streamer-discahrge ammonia type flue gas desulfurizing denitration demist integral method
Technical field
The present invention relates to a kind of streamer-discahrge ammonia type flue gas desulfurizing denitration demist integral method.
Background technology
Mainly contain flue dust, sulfur dioxide SO in coal and oil power station or the boiler smoke 2, nitrogen oxide NO xSome pollutants such as mercury Hg and compound thereof, the main task of gas cleaning is in earlier stage based on flue gas desulfurization, along with improving constantly of environmental protection standard, discharging to nitrogen oxide and heavy metal Hg is had higher requirement, and is also more and more higher to the requirement of denitration demercuration technology.
Ammonia-process desulfurization technique is used general at chemical field, use NH 3Absorb sulfuric acid or smelt the SO that produces in the tail gas 2, recyclable sulphur resource.Wherein the propylhomoserin method can be produced SO 2Relieving haperacidity, the ammonia fertilizer method can be produced ammonium sulfite and ammonium sulfate fertilizer.Ammonia process of desulfurization absorption rate is fast, and desulfurization product ammonium sulfate is the agrochemical of high added value, no solid waste, non-wastewater discharge.The ammonia process of desulfurization meets world's flue gas desulfurization development trend, especially tallies with the national condition.At China's sulfuric acid and phosphate fertilizer plant and smelting industry, owing to contain the sulphur concentration height, majority is ammonia-acid technological process, reclaims SO 2Relieving haperacidity.In recent years, water-tube boiler flue gas desulfurization ammonia process technological development was rapid, and was relatively low in view of sulfur content in the flue gas, adopted ammonia fertilizer method technology relatively to have economy.In the world, states such as U.S., moral is also just putting forth effort research with SO 2Be converted into the technology of ammonium sulfate.Through the development of two more than ten years, ammonia type flue gas desulfurizing has entered the industrial applications stage.
Ammonia process is absorbent with ammonia, can be liquefied ammonia, ammoniacal liquor or carbon ammonium, has abundant source.Ammonia process of desulfurization reaction rate is fast, and absorbent utilization rate height can keep the desulfuration efficiency of 95-99.9%, is desulfur technology efficient, low consumption, and maximum characteristics are SO 2But resource, byproduct ammonium sulfate chemical fertilizer added value height has good market prospects in China.There are some subject matters in the conventional ammonia process of desulfurization in actual motion, mainly contain: (1) single desulfurization, no denitration function; (2) potential tail gas the escaping of ammonia problem; (3) the tail gas ammonium salt is carried secretly; (4) tail gas acid mist and aerosol discharge are serious; (5) easily stop up.These problems even influence applying of the ammonia process of desulfurization.
Summary of the invention
The purpose of this invention is to provide a kind of streamer-discahrge ammonia type flue gas desulfurizing denitration demist integral method.
The technical solution used in the present invention is:
A kind of streamer-discahrge ammonia type flue gas desulfurizing denitration demist integral method comprises the following steps:
1) contains the boiler smoke of sulfur dioxide, nitrogen oxide, send into the streamer-discahrge Benitration reactor after the dedusting;
2) flue gas behind the streamer-discahrge Benitration reactor enters desulfurizing tower, and discharges from the desulfurization tower top outlet;
3) flue gas that comes out through the desulfurization tower top outlet purifies through the electrostatic precipitator demist and send smoke stack emission.
Be provided with circulating sprayer, oxidative system in the desulfurizing tower.
Step 2) in, in desulfurizing tower, after flue gas enters desulfurizing tower, flue gas from lower to upper, sulfur dioxide, nitrogen oxide and circulating sprayer ejection contain NH 3The circulated sprinkling absorption liquid contact of absorbent, generation contains+ammonium salt solution of 4 valency sulphur, be oxidized into through oxidative system and contain+ammonium salt solution of 6 valency sulphur, the circulating sprayer circulated sprinkling absorbs sulfur in smoke and nitrogen oxide, be condensed into the highly concentrated solution that total salt concentration reaches 20%-60% through circulated sprinkling repeatedly, discharge solution again and enter ammonium sulfate workshop section and carry out drying and dehydrating, make nitrogen fertilizer in agriculture, flue gas is then discharged from the desulfurization tower top outlet.
Electrostatic precipitator inside is provided with earthing pole and discharge electrode.
Described streamer-discahrge Benitration reactor inside is provided with earthing pole and discharge electrode.
The invention has the beneficial effects as follows:
1) complete resource.With ammonia is absorbent, is end-product with the chemical fertilizer.Can utilize deposed ammonia " treatment of wastes with processes of wastes against one another is turned waste into wealth ", not produce secondary pollution.Product nitrogenous fertilizer added value height has tangible economic benefit, especially meets the operating characteristic and the demand of petrochemical industry.
2) while desulphurization denitration, desulfuration efficiency are greater than 95%, and denitration efficiency is realized desulfurization and denitrification integral greater than 70%, can adapt to higher environmental requirement.
3) demist efficient height effectively suppresses the escaping of ammonia, and the escape concentration of ammonia is controlled at 10 mg/m 3Below.
4) employing of electrostatic precipitator has reduced ammonium salt and has carried secretly, lowers the ammonia loss, lowers outlet smoke evacuation turbidity, alleviates the corrosion to rear flue and chimney, reduces maintenance cost to greatest extent.
5) energy consumption is low, and is reliable efficient.
Description of drawings
Fig. 1 is a schematic diagram of the present invention, and Fig. 2 is technological process of the present invention and device schematic diagram.
The specific embodiment
A kind of streamer-discahrge ammonia type flue gas desulfurizing denitration demist integral method comprises the following steps:
1) flue gas of coal-burning boiler generation makes dust concentration reach 50mg/m through the electric cleaner dedusting 3Below;
2) flue gas is sent into streamer-discahrge Benitration reactor 1 through blower fan after the dedusting, be provided with alternate earthing pole 101 and discharge electrode 102 in the streamer-discahrge Benitration reactor 1, discharge electrode adopts the positive electrode discharge, two die openings are 30 ~ 100mm, the DC voltage that applies is 10 ~ 50kV, produce the time corona discharge under high voltage, the plasma free radical of generation is oxidized to NO with the NO in the flue gas 2Deng the material that is easy to wet absorption;
3) flue gas behind streamer-discahrge Benitration reactor 1 enters desulfurizing tower 2 by smoke inlet 201, be provided with in the desulfurizing tower 2, circulation circulating sprayer 202 and oxidative system 204 are in desulfurizing tower 2, flue gas from lower to upper, with the NH that contains of circulation circulating sprayer 202 ejection 3H 2The circulated sprinkling absorption liquid contact of O is having NH 3Under the absorbent condition, SO 2And NO xFinish the heat chemistry absorption process and enter liquid phase, with NH 3In conjunction with and partial oxidation generate and to comprise (NH 4) 2SO 3, NH 4HSO 3, (NH 4) 2SO 4, NH 4NO 2, NH 4NO 3Mixed solution, the ammonium salt mixed solution that obtains enters is located at oxidized in the interior oxidation system 204 at the bottom of the tower (make+S of 4 valencys change sulfate into), send into circulation circulating sprayer 202 by the circulating pump 203 of being located at desulfurizing tower 2 outsides again, continue spray, contact with flue gas, absorb the SO in the flue gas 2, be condensed into the solution that total salt concentration reaches 20%-60% through circulated sprinkling repeatedly, promptly discharge solution and enter ammonium sulfate workshop section and carry out drying and dehydrating, nitrogen fertilizer in agriculture; Simultaneously, flue gas is discharged from the desulfurization tower top outlet;
4) behind the flue gas process electrostatic precipitator 3 that the desulfurization tower top outlet comes out, strengthen the remaining SO of absorption gas phase 2, control residual the escaping of ammonia, capture fog particles, control SO 3And the ammonium salt particulate, purifying flue gas through smoke stack emission, the cigarette after demist purifies send smoke stack emission.
Step 2) ammoniacal liquor used in is by injecting desulfurizing tower 2 for ammonia device 205.
Electrostatic precipitator 3 inside are provided with earthing pole and discharge electrode.
The principle of desulphurization denitration of the present invention is as follows:
1, denitration principle
Nitrogen oxide is NO more than 95% in the boiler smoke, and NO is difficult with by wet absorption, and the effect of Benitration reactor is NO to be converted into be easy to the material that removed by wet absorption.
O is arranged in the flue gas 2And H 2O, NH 3When existing, between the discharge electrode of Benitration reactor and earthing pole, apply high voltage, the time corona discharge takes place between the two poles of the earth, make gas component ionization produce plasma free radical such as OH, O, O 3, N*, HO 2, NH 2, H, e etc., carry out following reaction with NO in the flue gas:
The reaction afterproduct enters desulfurizing tower, is absorbed and oxidation by ammonia process:
2, desulfurization principle
Absorbent ammoniacal liquor or gas ammonia are injected desulfurizing tower, with (NH 4) 2SO 3-NH 4HSO 3Mixed liquor is a circulating absorption solution, and it is contacted with flue gas, absorbs the SO in the flue gas 2:
In solution, there are ionization equilibrium in inferior sulfate radical and bisulfite:
3, sulfite oxidation
Oxidizing process simply is expressed as:
4, electrostatic precipitator
Conventional fillers or flap demist can only be removed the droplet more than 40 microns.The present invention can efficiently remove particulate more than 2 microns owing to adopt advanced electric demist technology to replace traditional filler or flap demist technology behind desulfurizing tower.The superpower mist ability of catching of electrostatic precipitator is guaranteed residual droplet in the flue gas, ammonium salt class aerosol cloud particulate, SO 3Acid mist and other trickle aerosols are effectively suppressed.Reduce ammonium salt and carry secretly, lower the ammonia loss, lower outlet smoke evacuation turbidity, alleviate corrosion, reduce maintenance cost to greatest extent, and satisfy stricter emission request rear flue and chimney.
Compare with existing conventional ammonia process technology, major technique characteristics of the present invention are:
Further specify the present invention below in conjunction with specific embodiment and Figure of description:
Embodiment 1:
With reference to figure 1, a kind of streamer-discahrge ammonia type flue gas desulfurizing denitration demist integral method comprises the following steps:
1) flue gas of coal-burning boiler generation makes dust concentration reach 50mg/m through the electric cleaner dedusting 3Below;
2) flue gas is sent into streamer-discahrge Benitration reactor 1 through blower fan after the dedusting, be provided with alternate earthing pole 101 and discharge electrode 102 in the streamer-discahrge Benitration reactor 1, discharge electrode adopts the positive electrode discharge, two die openings are 30 ~ 100mm, the DC voltage that applies is 10 ~ 50kV, produce the time corona discharge under high voltage, the plasma free radical of generation is oxidized to NO with the NO in the flue gas 2Deng the material that is easy to wet absorption;
3) flue gas behind streamer-discahrge Benitration reactor 1 enters desulfurizing tower 2 by smoke inlet 201, be provided with circulation circulating sprayer 202 and oxidative system 204 in the desulfurizing tower 2, in desulfurizing tower 2, flue gas from lower to upper, with the NH that contains of circulation circulating sprayer 202 ejection 3H 2The circulated sprinkling absorption liquid contact of O is having NH 3Under the absorbent condition, SO 2And NO xFinish the heat chemistry absorption process and enter liquid phase, with NH 3In conjunction with and partial oxidation generate and to comprise (NH 4) 2SO 3, NH 4HSO 3, (NH 4) 2SO 4, NH 4NO 2, NH 4NO 3Mixed solution, the ammonium salt mixed solution that obtains enters is located at oxidized in the interior oxidation system 204 at the bottom of the tower (make+S of 4 valencys change sulfate into), send into circulation circulating sprayer 202 by the circulating pump 203 of being located at desulfurizing tower 2 outsides again, continue spray, contact with flue gas, absorb the SO in the flue gas 2, be condensed into the solution that total salt concentration reaches 20%-30% through circulated sprinkling repeatedly, promptly discharge solution and enter ammonium sulfate workshop section and carry out drying and dehydrating, nitrogen fertilizer in agriculture; Flue gas is then discharged from desulfurization tower top outlet 206;
4) flue gas that comes out through desulfurization tower top outlet 206 enters electrostatic precipitator 3 from top to bottom through connecting flue, in electrostatic precipitator, strengthens the remaining SO of absorption gas phase 2, control residual the escaping of ammonia, capture fog particles, control SO 3And the ammonium salt particulate, purifying flue gas through smoke stack emission, the cigarette after demist purifies send smoke stack emission.
Step 2) ammoniacal liquor used in is by injecting desulfurizing tower 2 for ammonia device 205.
In the present embodiment, desulfuration efficiency 〉=96%, denitration efficiency 〉=85%, the escaping of ammonia are≤4 mg/m 3
Embodiment 2:
With reference to figure 2, a kind of streamer-discahrge ammonia type flue gas desulfurizing denitration demist integral method comprises the following steps:
1) flue gas of coal-burning boiler generation makes dust concentration reach 50mg/m through the sack cleaner dedusting 3Below;
2) flue gas is sent into streamer-discahrge Benitration reactor 1 through blower fan after the dedusting, be provided with alternate earthing pole 101 and discharge electrode 102 in the streamer-discahrge Benitration reactor 1, discharge electrode adopts the positive electrode discharge, two die openings are 150 ~ 300mm, the DC voltage that applies is 110 ~ 120kV, produce the time corona discharge under high voltage, the plasma free radical of generation is oxidized to NO with the NO in the flue gas 2Deng the material that is easy to wet absorption;
3) flue gas behind streamer-discahrge Benitration reactor 1 enters desulfurizing tower 2 by smoke inlet 201, is provided with circulating sprayer 202 and oxidative system 204 in the desulfurizing tower 2, in desulfurizing tower 2, flue gas from lower to upper, with the NH that contains of circulating sprayer 202 ejection 3H 2The circulated sprinkling absorption liquid contact of O is having NH 3Under the absorbent condition, SO 2And NO xFinish the heat chemistry absorption process and enter liquid phase, with NH 3In conjunction with and partial oxidation generate and to comprise (NH 4) 2SO 3, NH 4HSO 3, (NH 4) 2SO 4, NH 4NO 2, NH 4NO 3Mixed solution, the ammonium salt mixed solution that obtains enters is located at oxidized in the interior oxidation system 204 at the bottom of the tower (make+S of 4 valencys change sulfate into), sends into circulating sprayer 202 by the circulating pump 203 of being located at desulfurizing tower 2 outsides again, continues spray, contact with flue gas, absorb the SO in the flue gas 2, be condensed into the solution that total salt concentration reaches 50%-60% through circulated sprinkling repeatedly, promptly discharge solution and enter ammonium sulfate workshop section and carry out drying and dehydrating, nitrogen fertilizer in agriculture; Flue gas is then discharged from the desulfurization tower top outlet;
4) flue gas that comes out through the desulfurization tower top outlet directly enters the electrostatic precipitator 3 that places desulfurizing tower 2 tops, in electrostatic precipitator, strengthens the remaining SO of absorption gas phase 2, control residual the escaping of ammonia, capture fog particles, control SO 3And the ammonium salt particulate, purifying flue gas through smoke stack emission, the cigarette after demist purifies send smoke stack emission.
Step 2) ammoniacal liquor used in is by injecting desulfurizing tower 2 for ammonia device 205.
In the present embodiment, desulfuration efficiency 〉=97%, denitration efficiency 〉=90%, the escaping of ammonia≤5mg/m 3
Among the present invention, electrostatic precipitator 3 is a known equipment.
Among the embodiment, used oxidative system is oxidation pond (for known equipment), and the oxidation pond bottom is provided with the compressed air inlet, feeds compressed air by the compressed air inlet, and+4 valency sulphur are oxidized to+6 valency sulphur.Described mode of oxidizing is the air oxidation that blasts air, also can be the catalytic oxidation that has catalyst to participate in, the advanced oxidation that has ozone or other plasma free radicals to participate in.

Claims (5)

1. a streamer-discahrge ammonia type flue gas desulfurizing denitration demist integral method is characterized in that: comprise the following steps:
1) contains the boiler smoke of sulfur dioxide, nitrogen oxide, send into streamer-discahrge Benitration reactor (1) after the dedusting;
2) flue gas behind streamer-discahrge Benitration reactor (1) enters desulfurizing tower (2), and discharges from the desulfurization tower top outlet;
3) flue gas that comes out through the desulfurization tower top outlet purifies through electrostatic precipitator (3) demist and send smoke stack emission.
2. a kind of streamer-discahrge ammonia type flue gas desulfurizing denitration demist integral method according to claim 1 is characterized in that: be provided with circulating sprayer (202), oxidative system (204) in the desulfurizing tower (2).
3. a kind of streamer-discahrge ammonia type flue gas desulfurizing denitration demist integral method according to claim 1, it is characterized in that: step 2) in, in desulfurizing tower (2), after flue gas enters desulfurizing tower (2), flue gas from lower to upper, sulfur dioxide, nitrogen oxide and circulating sprayer (202) ejection contain NH 3The circulated sprinkling absorption liquid contact of absorbent, generation contains+ammonium salt solution of 4 valency sulphur, be oxidized into through oxidative system (204) and contain+ammonium salt solution of 6 valency sulphur, circulating sprayer (202) circulated sprinkling absorbs sulfur in smoke and nitrogen oxide, be condensed into the highly concentrated solution that total salt concentration reaches 20%-60% through circulated sprinkling repeatedly, discharge solution again and enter ammonium sulfate workshop section and carry out drying and dehydrating, make nitrogen fertilizer in agriculture, flue gas is then discharged from the desulfurization tower top outlet.
4. a kind of streamer-discahrge ammonia type flue gas desulfurizing denitration demist integral method according to claim 1, it is characterized in that: electrostatic precipitator (3) inside is provided with earthing pole and discharge electrode.
5. a kind of streamer-discahrge ammonia type flue gas desulfurizing denitration demist integral method according to claim 1, it is characterized in that: described streamer-discahrge Benitration reactor (1) inside is provided with earthing pole (101) and discharge electrode (102).
CN2011102068147A 2011-07-22 2011-07-22 Steamer discharge ammonia flue gas desulfurization, denitration and demisting integrated method Pending CN102274680A (en)

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Cited By (7)

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CN102764574A (en) * 2012-07-16 2012-11-07 广东佳德环保科技有限公司 Desulfurization and denitrification method for streamer discharge plasma free radical injected flue gas
CN102764573A (en) * 2012-07-16 2012-11-07 广东佳德环保科技有限公司 Streamer corona plasma flue gas denitrification method
CN102935326A (en) * 2012-11-10 2013-02-20 大连理工大学 Array-type narrow-gap coaxial streamer discharge reactor for gaseous pollutant pretreatment
CN105498475A (en) * 2015-12-03 2016-04-20 广州市美控电子科技有限公司 Liquid-state electrode denitration device
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
CN106178871A (en) * 2016-07-26 2016-12-07 招金矿业股份有限公司 The acid fume processing method that a kind of gold silver mud is smelted
CN111330423A (en) * 2020-03-06 2020-06-26 昆明理工大学 Method for simultaneously removing nitrogen oxide and gaseous mercury

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Cited By (7)

* Cited by examiner, † Cited by third party
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CN102764574A (en) * 2012-07-16 2012-11-07 广东佳德环保科技有限公司 Desulfurization and denitrification method for streamer discharge plasma free radical injected flue gas
CN102764573A (en) * 2012-07-16 2012-11-07 广东佳德环保科技有限公司 Streamer corona plasma flue gas denitrification method
CN102935326A (en) * 2012-11-10 2013-02-20 大连理工大学 Array-type narrow-gap coaxial streamer discharge reactor for gaseous pollutant pretreatment
CN105498475A (en) * 2015-12-03 2016-04-20 广州市美控电子科技有限公司 Liquid-state electrode denitration device
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
CN106178871A (en) * 2016-07-26 2016-12-07 招金矿业股份有限公司 The acid fume processing method that a kind of gold silver mud is smelted
CN111330423A (en) * 2020-03-06 2020-06-26 昆明理工大学 Method for simultaneously removing nitrogen oxide and gaseous mercury

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