CN1628892A - Plasma process for purifying coal-burning boiler smoke gas - Google Patents
Plasma process for purifying coal-burning boiler smoke gas Download PDFInfo
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- CN1628892A CN1628892A CN 200310121117 CN200310121117A CN1628892A CN 1628892 A CN1628892 A CN 1628892A CN 200310121117 CN200310121117 CN 200310121117 CN 200310121117 A CN200310121117 A CN 200310121117A CN 1628892 A CN1628892 A CN 1628892A
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- flue gas
- gas
- ammonia
- ammonium
- flue
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Abstract
This invention relates to coal-burning boiler smoke new process and device by use of corona discharge and electron beam plasm compound technique, which comprises the following steps: the boiler smoke goes through static dust cleaner and exchanges heat with gag to gas converter; then it goes into frog drying tower for wetting and lowering temperature; then it enters the corona discharge chamber to make oxidation to generate acid substance; the product is mixed with smoke and ammonia injected by liquid ammonia tar and then enters the electronic speeder to generate electronic beam reaction; the generated ammonia sulfate and ammonium nitrate mixed particles are collected in the solution groove.
Description
Technical field
The present invention is a kind of using plasma technology, i.e. corona discharge and electron beam irradiation series connection, middle notes ammonia purify the method for fire coal boiler fume, can efficiently remove the SO in the flue gas
2And NO
X, make it to generate (NH
4)
2SO
3And NH
4NO
3, and reclaimed and fully utilize.
Background technology
Since China carried out reforms opening, national economy had obtained development at full speed, and meanwhile, the energy industry of China develops rapidly especially.But because the national conditions of China are to be the country of main energy sources with the fire coal, and this situation will be long-term.Fire coal produces a large amount of SO simultaneously
2, NO
XWith organic matter (VOC) of volatile etc., they cause severe contamination to environment, and are restricting the sustainable development of national economy.For this reason, in recent years, people constantly explore the technology that removes harmful substance, the late 20th century particularly, major progress is being obtained aspect research application plasma technique processing fire coal boiler fume and the comprehensive utilization in countries in the world, as U.S. Pat 5.695.616, Japanese patent CN1225035A, Chinese patent CN1332029A, CN1373558A etc. in China's registration.Utilizing the stage that has reached pilot-plant test aspect the high-voltage pulse Corona discharge Treatment coal-fired flue-gas; Electron beam dry process coal-fired flue-gas method (being the EBA method) has applied to industrial practice (as Chengdu steam power plant, Hangzhou joint power plant etc.).Meanwhile, my company cooperates with nuclear energy technology design and research institute of Tsing-Hua University, worked out electron beam semidry method coal-fired flue-gas purification technology, it has overcome easily harden shortcomings such as discharging difficulty, synchronous operation rate be low of electron beam dry method energy consumption height, byproduct, and has entered industrial demonstration phase.But said method still also exists the problem that energy consumption is higher, removal efficiency is low (particularly removal efficiency of nitrogen oxides is low).
Summary of the invention
The present invention utilizes plasma technique, i.e. SO in the incompatible deep oxidation fire coal boiler fume of corona discharge and accelerator electron beam tandem junction
2, NO
XEtc. harmful substance, make itself and the ammonia generation chemical reaction that before corona reaction back and electron-beam reaction chamber, injects generate ammonium salt, and with efficient collecting tower--the counter direction jet trays tower captures byproduct and purification flue gas and device.
Its technology (referring to accompanying drawing) is the high-temperature flue gas that coal-burning boiler is produced, after power plant provides the electrostatic precipitator dedusting for oneself, enter gas-to-gas heat exchanger 1., carry out heat exchange with flue gas after being purified here, the flue gas after being purified temperature is risen to about 80 ℃, in atmosphere, spread in order to it.The temperature that does not purify flue gas decreases, and enters spray drying tower 2..At this, the solution that is rich in sulphur ammonium and ammonium nitrate with the subsequent technique collection, spray into the high-temperature flue gas with rotary or air-flowing type following current from the top of tower atomizer, droplet mixes with flue gas and produces mass transfer and diabatic process, flue gas is further lowered the temperature and humidification, make the saliferous droplet obtain drying and form solid particle, the particle of greater particle size (＞50 μ m) is under the gravity effect, be collected in the tower bottom feed bin, be interrupted and discharge into byproduct---chemical fertilizer.3. particle than small particle diameter (＜50 μ m) enters the corona discharge reative cell with flue gas.The flue gas of humidification, cooling makes SO wherein under the effect of the free radical that corona discharge produces
2And NO
XPartial oxidation becomes superfine sulfuric acid and nitric acid droplet to mix in flue gas.For removing is sunken to the solid of reative cell bottom, stop up to remove, must be interrupted water and clean.After flue gas flows out the corona reative cell, with after the ammonia that is 4. injected by the liquefied ammonia system evenly mixes, enter the electron-beam reaction chamber 5. in flue, flue gas produces strong oxidation base O, OH, HO under the electron beam effect
2, make the SO in the flue gas
2, NO
XAnd the sulphite ((NH that generates in the flue
4)
2SO
3) wait and carry out deep oxidation, generate (NH
4)
2SO
4And NH
4NO
3Mixture, be colloid microparticle shape and be mixed in the flue gas, flue gas enters the collecting tower---6. the counter direction jet trays tower carries out ammonium salt and captures.Because adopted this water and the salt circulation fluid efficient collecting equipment as collecting agent, the collecting rate of sulphur ammonium and ammonium nitrate can reach 99.8%.Simultaneously, the ammonia of not participating in reaction in technology has also been played effective collecting, made ammonia-spillage amount＜3ppm, flue gas has obtained sufficient purification.Enter atmosphere by booster fan after flue gas after being purified and the high-temperature flue gas heat exchange.
Flushing liquor in the salting liquid of collecting tower and miscellaneous equipment and the flue be collected in collecting tank 7. in, 8. the higher salting liquid of concentration is transported to spray drying tower by pump, be used for not purifying humidification, the cooling of flue gas, and utilize do not purify flue gas with the salting liquid granulation, be dried to qualified byproduct---chemical fertilizer.
Because this technical process has adopted the plasma technology of corona discharge and electron beam irradiation two-stage series connection, and has injected liquefied ammonia in the middle of two-stage series connection, this has just improved the SO in the flue gas greatly
2, NO
XAnd the removal efficiency of volatile organic matter (VOC).Its removal efficiency can reach 98%, 70%, 98% respectively.The adaptability of this technology is strong simultaneously, and the flue gas that produces for the bunker coal of various sulfurs all can effectively purify.
Because the byproduct product is soluble in water, process using wet method collect product, equipment and pipeline can be interrupted the water flushing, this is problems such as equipment hardens, obstruction with regard to having been avoided, and have mentioned the synchronous operation rate of desulfurizer and electricity generation system.
This technical process has adopted dynamical counter direction jet trays tower, and it captures the efficient of ammonium salt up to 99.8%, and to dust, unreacted SO
2, ease ammonia etc. effectively absorbs simultaneously and capture, and flue gas is well purified.
Compare with other method, this process energy consumption is lower.
Description of drawings
Accompanying drawing is a plasma fire coal boiler fume process for purifying flow chart of the present invention.
1 gas-gas heat exchanger, 2 spray dryers, corona chambers 3,4 liquid ammonia storage tanks, electron- beam reaction chambers 5,6 counter direction jet trays towers, 7 collecting tanks, 8 pumps among the figure.
The specific embodiment
Embodiment
The raw flue gas amount of the coal-burning boiler of a 100MW generating set is about 45 * 10
4Nm
3/ h, after the deduster dedusting, about 150 ℃ of its cigarette temperature contains SO
2-2900mg/L, NO
X-500mg/L, dustiness≤200mg/Nm
3, carry out heat exchange with flue gas after being purified (temperature 〉=55 ℃) at gas-to-gas heat exchanger (as Fig. 1), make flue-gas temperature reduce to 130-135 ℃; Evenly enter from the flue gas distributor at spray drying tower (2) top, being rich in the byproduct circulation solution with the subsequent technique of atomizing mixes, making flue gas is that the 9.5m height is for humidification (9%-11%), cooling (70 ℃-85 ℃) in the tower of 36m, to reach technological requirement at diameter; Simultaneously byproduct is carried out granulation and drying, the particle of particle diameter 〉=50mm (about 70%) goes downstream, and falls to the cone position of tower, the discharge of interruption; And the byproduct particle of particle diameter≤50mm then together enters the corona chamber (3) of Φ 4m * Lgm with flue gas, is about the streamer-discahrge of 20KW through corona discharge power, produces free radical and also acts on harmful substance SO in the flue gas
2, NO
x, make partial oxidation generate acidic materials, product and flue gas are entering electron-beam reaction chamber (5) before, in flue, inject equivalent and be preheated to 65 ℃ liquefied ammonia (4300t/, 8t/ days), after evenly mixing, enter electron-beam reaction chamber (Φ 2.6m * L12m) immediately; At electron accelerator power is 200-300KW, and its energy is 1.2Mev, and beam intensity is 80mA-400mA, and irradiation intensity is to carry out irradiation under the situation of 1-3kGy, produces strong oxidative free radical in the flue gas once more, makes SO
2, NO
xAnd volatile organic matter (VOC) further obtains oxidation, and and ammonia generation neutralization reaction, generate very thin colloidal solid thing.(Φ 5.5m * H125m) purify with technology circulation fluid and Xin Shui (17t/h) in (6), its purification efficiency can reach 99.75%, ammonia-spillage amount≤3ppm at counter direction jet trays tower efficiently to contain the flue gas that removes thing.Concentration reaches the circulation solution of 30%-40%, is delivered to the high speed rotary sprayer of spray-drying top of tower with pump (8), and the cooling, humidification and the byproduct that are used for flue gas reclaim.Under above-mentioned process conditions, produce sulphur ammonium and ammonium nitrate mixture (ammonium nitrate accounts for 8%) 17000t per year, produce 68t every day.Flue gas after demist temperature at 55 ℃-60 ℃, with the emptying behind 〉=75 ℃ in gas-gas heat exchanger heating of initial hot flue gas.The sulfur dioxide in flue gas removal efficiency of whole technical process reaches 98%, and nitrogen oxide reaches 70%, and VOC reaches more than 98%.
Claims (2)
1, a kind of plasma fire coal boiler fume purification technology comprises following operation:
1) high-temperature flue gas of coal-burning boiler is after the electrostatic precipitator dedusting, enter spray drying tower by gas-to-gas heat exchanger, flue gas carries out humidification, cooling with the ammonium salt solution that subsequent handling is collected to flue gas here, heat energy with flue gas itself carries out granulation, oven dry with sulphur ammonium and ammonium nitrate simultaneously, bigger particle is collected in tower bottom, is interrupted and discharges into byproduct.
2) flue gas of humidifying cooling at first enters the corona chamber, and corona discharge produces the free radical of strong oxidation, to the SO in the flue gas
2And NO
XCarry out preliminary oxidation Deng material, and collect the short grained byproduct of the part of failing to collect simultaneously by spray drying tower.
3) ammonia of flue gas and equivalent injection evenly mixes at flue.
4) and the mixed flue gas of ammonia enter the electron-beam reaction chamber, in the radical pair flue gas that produces by electron beam irradiation in corona discharge process not oxidized SO
2, NO
x, the ammonium sulfite that generates in VOC and the process carries out deep oxidation, makes it to generate materials such as ammonium sulfate and ammonium nitrate.
5) flue gas that contains sulphur ammonium and ammonium nitrate enters the counter direction jet trays tower, and water and cyclic salt solution carry out effective collecting.Because its collecting efficient height can not only capture byproduct well, simultaneously ease ammonia and dust are also carried out collecting, to obtain the flue gas of higher degree of purification.
2, a kind of main technologic parameters scope of plasma fire coal boiler fume purification technology:
1) this technology can be handled the flue gas condition of coal-burning boiler:
Smoke treatment amount: 500～75 * 10
5Nm
3/ h
Sulfur dioxide (SO
2) concentration: 450～6000ppm
Nitrogen oxide (NO
x) concentration: 150～1700ppm
Temperature: 120～250 ℃
2) spray drying tower adopts concurrent and high speed rotating spraying.Input gas temperature＞120 ℃, 60～85 ℃ of exit gas temperatures.
3) the controllable silicon DC high-voltage power supply is adopted in the corona chamber, and power is 20～80kW.
4) liquefied ammonia is heated to 50～80 ℃, mixes with flue gas with the compressed air input before entering the accelerator reative cell.
5) electrical power of electron accelerator is 100～600kW, and power output is 0.8～1.2MeV, and beam intensity is 40～400mA, and irradiation dose is 1～3kGy, and gas speed is 1～33m/s, and the flue-gas temperature that enters the electron-beam reaction chamber is 60～80 ℃.
6) the collecting efficient of counter direction jet trays tower is 99.8%, ammonia-spillage amount＜3ppm.
7) collecting tank solution need be heated to 50～70 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310121117 CN1628892A (en) | 2003-12-15 | 2003-12-15 | Plasma process for purifying coal-burning boiler smoke gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310121117 CN1628892A (en) | 2003-12-15 | 2003-12-15 | Plasma process for purifying coal-burning boiler smoke gas |
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|---|---|
| CN1628892A true CN1628892A (en) | 2005-06-22 |
Family
ID=34844057
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011147085A1 (en) * | 2010-05-26 | 2011-12-01 | Ecospec Global Technology Pte Ltd. | Methods and system for removing gas components from flue gas |
| CN102847396A (en) * | 2012-04-19 | 2013-01-02 | 绍兴文理学院 | Coal-fired flue gas plasma purification device and purification method thereof |
| CN102861758A (en) * | 2012-09-26 | 2013-01-09 | 西安建筑科技大学 | Pyrogenic decomposition smoke low-temperature plasma purification equipment and method of household garbage |
| CN103225816A (en) * | 2013-05-17 | 2013-07-31 | 延边石岘白麓纸业股份有限公司 | Heat supplying production line |
| CN105642081A (en) * | 2016-01-08 | 2016-06-08 | 杭州西庸科技有限公司 | Method for thoroughly decomposing dioxin |
| CN106989407A (en) * | 2016-01-20 | 2017-07-28 | 杭州中兵环保股份有限公司 | NOx cancellation elements and method in a kind of flue gas |
| CN107138045A (en) * | 2017-06-12 | 2017-09-08 | 青岛双瑞海洋环境工程股份有限公司 | Marine exhaust processing unit for removing sulfur and nitrogen oxides simultaneously |
| CN111644033A (en) * | 2020-06-10 | 2020-09-11 | 贵州省鑫瀚蓝环保科技有限公司 | High-efficiency desulfurization method |
| CN113750680A (en) * | 2021-08-31 | 2021-12-07 | 徐森淼 | Industrial flue gas desulfurization and denitrification dust remover |
-
2003
- 2003-12-15 CN CN 200310121117 patent/CN1628892A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8529855B2 (en) | 2010-05-26 | 2013-09-10 | Ecospec Global Technology Pte Ltd. | Methods and system for removing gas components from flue gas |
| CN102811793A (en) * | 2010-05-26 | 2012-12-05 | 艺科环球科技私人有限公司 | Methods And System For Removing Gas Components From Flue Gas |
| WO2011147085A1 (en) * | 2010-05-26 | 2011-12-01 | Ecospec Global Technology Pte Ltd. | Methods and system for removing gas components from flue gas |
| CN102811793B (en) * | 2010-05-26 | 2014-11-26 | 艺科环球科技私人有限公司 | Methods and system for removing gas components from flue gas |
| CN102847396A (en) * | 2012-04-19 | 2013-01-02 | 绍兴文理学院 | Coal-fired flue gas plasma purification device and purification method thereof |
| CN102861758A (en) * | 2012-09-26 | 2013-01-09 | 西安建筑科技大学 | Pyrogenic decomposition smoke low-temperature plasma purification equipment and method of household garbage |
| CN103225816A (en) * | 2013-05-17 | 2013-07-31 | 延边石岘白麓纸业股份有限公司 | Heat supplying production line |
| CN105642081A (en) * | 2016-01-08 | 2016-06-08 | 杭州西庸科技有限公司 | Method for thoroughly decomposing dioxin |
| CN105642081B (en) * | 2016-01-08 | 2018-01-30 | 杭州西庸科技有限公司 | A kind of method for thoroughly decomposing dioxin |
| CN106989407A (en) * | 2016-01-20 | 2017-07-28 | 杭州中兵环保股份有限公司 | NOx cancellation elements and method in a kind of flue gas |
| CN107138045A (en) * | 2017-06-12 | 2017-09-08 | 青岛双瑞海洋环境工程股份有限公司 | Marine exhaust processing unit for removing sulfur and nitrogen oxides simultaneously |
| CN111644033A (en) * | 2020-06-10 | 2020-09-11 | 贵州省鑫瀚蓝环保科技有限公司 | High-efficiency desulfurization method |
| CN113750680A (en) * | 2021-08-31 | 2021-12-07 | 徐森淼 | Industrial flue gas desulfurization and denitrification dust remover |
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