CN104474897A - Method for removing sulfur trioxide from coal-fired flue gas - Google Patents
Method for removing sulfur trioxide from coal-fired flue gas Download PDFInfo
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- CN104474897A CN104474897A CN201410721263.1A CN201410721263A CN104474897A CN 104474897 A CN104474897 A CN 104474897A CN 201410721263 A CN201410721263 A CN 201410721263A CN 104474897 A CN104474897 A CN 104474897A
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Abstract
The invention discloses a method for removing sulfur trioxide from coal-fired flue gas. The method comprises the following steps: ejecting a certain amount of calcium hydroxide or magnesium oxide or magnesium hydroxide or sodium bicarbonate or sodium carbonate particles obtained in a step A into flue gas in a flue in front of the inlet end of a denitration unit and a flue between the outlet end of the denitration unit and an air preheater, wherein the amount of the ejected calcium hydroxide or magnesium oxide or magnesium hydroxide or sodium bicarbonate or sodium carbonate particles is 2-6 times the mole number of the sulfur trioxide which is to be removed from the position; allowing the calcium hydroxide or magnesium oxide or magnesium hydroxide or sodium bicarbonate or sodium carbonate particles to have a gas and solid reaction with the sulfur trioxide in the flue gas so as to remove the sulfur trioxide from the flue gas. The invention aims to provide a method for removing the sulfur trioxide from the coal-fired flue gas, wherein the method can be used for realizing total-load denitration and preventing the problems of inactivation and abrasion of a denitration catalyst, blocking of the air preheater and the like so as to guarantee normal running of a coal-firing machine.
Description
Technical field
The present invention relates to a kind of method removing sulfur trioxide in coal-fired flue-gas.
Background technology
Existing coal unit generally starts to utilize selective catalytic reduction denitration (Selective Catalytic Reduction, SCR) technique carries out denitration process to flue gas, but owing to needing to there is a small amount of sulfur trioxide in flue gas to be processed, sulfur trioxide can react with ammonia and steam, the ammonium hydrogen sulfate generated and sulfuric acid, deposit at the hydrogen-catalyst reactor of SCR denitration device and air preheater place, cause catalyst failure and air preheater blocking, and then after causing coal unit that SCR denitration device is installed, there will be a series of problem, comprise underload SCR denitration to compel to move back, denitrating catalyst inactivation, catalyst abrasion, air preheater blocking etc., due to the existence of the problems referred to above, the denitration efficiency of SCR denitration device can be caused sharply to decline with power plant's energy consumption rising and the normal operation of coal unit can be affected.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides one and can avoid occurring the problems such as underload SCR denitration compels to move back, denitrating catalyst inactivation, catalyst abrasion, air preheater blocking, ensure the high efficiency denitration efficiency of SCR denitration device, avoid air preheater to block, and then the method removing sulfur trioxide in coal-fired flue-gas that coal unit normally runs can be guaranteed.
The method removing sulfur trioxide in coal-fired flue-gas of the present invention, comprises the steps:
A, prepare the calcium hydroxide of solid or magnesia or magnesium hydroxide or sodium acid carbonate or sodium carbonate, the calcium hydroxide of solid or magnesium hydroxide or sodium acid carbonate or sodium carbonate are ground into graininess;
In B, dynamic monitoring Benitration reactor exhaust pass and air preheater gas approach flue gas, the concentration of sulfur trioxide, obtains the concentration target value of the sulfur trioxide needing to remove;
C, described exhaust gases passes are provided with selective catalytic reduction (SCR) denitrification apparatus and air preheater from front to back successively;
D, according to the concentration of sulfur trioxide in Benitration reactor exiting flue gas, spray by the calcium hydroxide obtained in steps A or magnesia or magnesium hydroxide or sodium acid carbonate or sodium carbonate particle in the flue gas in the exhaust gases passes before selective catalytic reduction (SCR) denitrification apparatus entrance point, in per unit volume flue gas, the emitted dose of calcium hydroxide or magnesia or magnesium hydroxide or sodium acid carbonate or powdered sodium carbonate is 2-6 times that this position needs the molal quantity of the sulfur trioxide removed, simultaneously according to the concentration of sulfur trioxide in air preheater inlet flue gas, flue gas also to the exhaust gases passes be arranged between selective catalytic reduction (SCR) denitration outlet end and air preheater sprays the calcium hydroxide or magnesia or magnesium hydroxide or NaOH or potassium hydroxide or sodium acid carbonate or sodium carbonate particle that are obtained by steps A, in per unit volume flue gas, the emitted dose of calcium hydroxide or magnesia or magnesium hydroxide or sodium acid carbonate or powdered sodium carbonate is 2-6 times that this position needs the molal quantity of the sulfur trioxide removed, by the sulfur trioxide generation gas-solid reaction in calcium hydroxide or magnesia or magnesium hydroxide or sodium acid carbonate or sodium carbonate particle and flue gas, sulfur trioxide in flue gas is removed.
Further, the calcium hydroxide obtained in described steps A or magnesia or magnesium hydroxide or NaOH or potassium hydroxide or sodium acid carbonate or sodium carbonate particle particle diameter are less than 50 μm; The injection direction spraying calcium hydroxide or magnesia or magnesium hydroxide or sodium acid carbonate or powdered sodium carbonate in described step D in flue gas is that the direction of flow of flue gas is consistent, and in per unit volume flue gas, the emitted dose of calcium hydroxide or magnesia or magnesium hydroxide or sodium acid carbonate or powdered sodium carbonate is 2-6 times of the molal quantity needing the sulfur trioxide removed.
The method removing sulfur trioxide in coal-fired flue-gas of the present invention, according to the concentration of sulfur trioxide in Benitration reactor exiting flue gas, spray by the calcium hydroxide obtained in steps A or magnesia or magnesium hydroxide or sodium acid carbonate or sodium carbonate particle in the flue gas in the exhaust gases passes before selective catalytic reduction (SCR) denitrification apparatus entrance point, in per unit volume flue gas, the emitted dose of calcium hydroxide or magnesia or magnesium hydroxide or sodium acid carbonate or powdered sodium carbonate is 2-6 times that this position needs the molal quantity of the sulfur trioxide removed, simultaneously according to the concentration of sulfur trioxide in air preheater inlet flue gas, flue gas also to the exhaust gases passes be arranged between selective catalytic reduction (SCR) denitration outlet end and air preheater sprays the calcium hydroxide or magnesia or magnesium hydroxide or sodium acid carbonate or sodium carbonate particle that are obtained by steps A, in per unit volume flue gas, the emitted dose of calcium hydroxide or magnesia or magnesium hydroxide or sodium acid carbonate or powdered sodium carbonate is 2-6 times that this position needs the molal quantity of the sulfur trioxide removed, by the sulfur trioxide generation gas-solid reaction in calcium hydroxide or magnesia or magnesium hydroxide or sodium acid carbonate or sodium carbonate particle and flue gas, sulfur trioxide in flue gas is removed.Solve coal unit thus and a series of side effect brought after SCR denitration device is installed: underload SCR denitration compels to move back, the blocking of denitrating catalyst inactivation, catalyst abrasion, air preheater.Therefore, the method removing sulfur trioxide in coal-fired flue-gas of the present invention can avoid occurring the problems such as underload SCR denitration compels to move back, denitrating catalyst inactivation, catalyst abrasion, air preheater blocking, ensure the high efficiency denitration efficiency of SCR denitration device, and then can guarantee that coal unit normally runs.
Below in conjunction with embodiment, the specific embodiment of the present invention is described in further detail.
Detailed description of the invention
The method removing sulfur trioxide in coal-fired flue-gas of the present invention, comprises the steps:
A, prepare the calcium hydroxide of solid or magnesia or magnesium hydroxide or sodium acid carbonate or sodium carbonate, the calcium hydroxide of solid or magnesia or magnesium hydroxide or sodium acid carbonate or sodium carbonate are ground into graininess;
In B, dynamic monitoring Benitration reactor exhaust pass and air preheater gas approach flue gas, the concentration of sulfur trioxide, obtains the concentration target value of the sulfur trioxide needing to remove;
C, described exhaust gases passes are provided with selective catalytic reduction (SCR) denitrification apparatus and air preheater from front to back successively;
D, according to the concentration of sulfur trioxide in Benitration reactor exiting flue gas, spray by the calcium hydroxide obtained in steps A or magnesia or magnesium hydroxide or sodium acid carbonate or sodium carbonate particle in the flue gas in the exhaust gases passes before selective catalytic reduction (SCR) denitrification apparatus entrance point, in per unit volume flue gas, the emitted dose of calcium hydroxide or magnesia or magnesium hydroxide or sodium acid carbonate or powdered sodium carbonate is 2-6 times that this position needs the molal quantity of the sulfur trioxide removed, simultaneously according to the concentration of sulfur trioxide in air preheater inlet flue gas, flue gas also to the exhaust gases passes be arranged between selective catalytic reduction (SCR) denitration outlet end and air preheater sprays the calcium hydroxide or magnesia or magnesium hydroxide or sodium acid carbonate or sodium carbonate particle that are obtained by steps A, in per unit volume flue gas, the emitted dose of calcium hydroxide or magnesium hydroxide or magnesia or NaOH or powdered sodium carbonate is 2-6 times that this position needs the molal quantity of the sulfur trioxide removed, by the sulfur trioxide generation gas-solid reaction in calcium hydroxide or magnesia or magnesium hydroxide or sodium acid carbonate or sodium carbonate particle and flue gas, sulfur trioxide in flue gas is removed.
As a further improvement on the present invention, the calcium hydroxide obtained in above-mentioned steps A or magnesia or magnesium hydroxide or sodium acid carbonate or sodium carbonate particle particle diameter are less than 50 μm; The injection direction spraying calcium hydroxide or magnesia or magnesium hydroxide or sodium acid carbonate or powdered sodium carbonate in described step D in flue gas is that the direction of flow of flue gas is consistent, in per unit volume flue gas the emitted dose of calcium hydroxide or magnesia or magnesium hydroxide or sodium acid carbonate or powdered sodium carbonate be the 2-6 of the molal quantity needing the sulfur trioxide removed doubly
In existing gas denitrifying technology, SCR, with advantages such as its technology maturation, denitration efficiencies high (can reach 70%-90% or more), is used widely in power plant.Along with the raising of environmental protection standard, SCR technology has become domestic coal fired power plant denitration mainstream technology.But the outstanding problem such as such as underload denitration is compeled to move back, catalyst abrasion, catalysqt deactivation, air preheater blocking that SCR denitration technology also exists.Cause SCR denitration the main cause that underload compels to move back be unit at underload time cigarette temperature low, owing to containing sulfur trioxide in flue gas, sulfur trioxide and the ammonia react sprayed into generate the sticking ammonium hydrogen sulfate of tool, cause catalyst blockage, catalyst loses activity, when temperature reduces further, ammonium hydrogen sulfate forms solid particle, cause catalyst abrasion, sulfur trioxide and escape ammonia react the ammonium hydrogen sulfate generating viscosity simultaneously, enter air preheater and air preheater can be caused to block.And existing air preheater is mainly transformed in the existing measure preventing air preheater from blocking, improve blowing pressure and the frequency, the main technological route preventing denitrification apparatus under underload from compeling to move back improves denitration reactor inlet cigarette temperature or improves feed temperature, and cost is high, maintenance cost is high consume high.The present invention is by removing the method for the sulfur trioxide in flue gas, and the technology of the comprehensive regulation coal-fired SCR denitration technology side effect, not only invests low, and easily realize, easy to operate.
Comprise the above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (2)
1. remove the method for sulfur trioxide in coal-fired flue-gas, it is characterized in that, comprise the steps:
A, prepare the calcium hydroxide of solid or magnesia or magnesium hydroxide or sodium acid carbonate or sodium carbonate, the calcium hydroxide of solid or magnesia or magnesium hydroxide or sodium acid carbonate or sodium carbonate are ground into graininess;
In B, dynamic monitoring Benitration reactor exhaust pass and air preheater gas approach flue gas, the concentration of sulfur trioxide, obtains the concentration target value of the sulfur trioxide needing to remove;
C, described exhaust gases passes are provided with selective catalytic reduction (SCR) denitrification apparatus and air preheater from front to back successively;
D, according to the concentration of sulfur trioxide in Benitration reactor exiting flue gas, spray by the calcium hydroxide obtained in steps A or magnesia or magnesium hydroxide or sodium acid carbonate or sodium carbonate particle in the flue gas in the exhaust gases passes before selective catalytic reduction (SCR) denitrification apparatus entrance point, in per unit volume flue gas, the emitted dose of calcium hydroxide or magnesia or magnesium hydroxide or sodium acid carbonate or powdered sodium carbonate is 2-6 times that this position needs the molal quantity of the sulfur trioxide removed, simultaneously according to the concentration of sulfur trioxide in air preheater inlet flue gas, flue gas also to the exhaust gases passes be arranged between selective catalytic reduction (SCR) denitration outlet end and air preheater sprays the calcium hydroxide or magnesia or magnesium hydroxide or sodium acid carbonate or sodium carbonate particle that are obtained by steps A, in per unit volume flue gas, the emitted dose of calcium hydroxide or magnesia or magnesium hydroxide or sodium acid carbonate or powdered sodium carbonate is 2-6 times that this position needs the molal quantity of the sulfur trioxide removed, by the sulfur trioxide generation gas-solid reaction in calcium hydroxide or magnesia or magnesium hydroxide or sodium acid carbonate or sodium carbonate particle and flue gas, sulfur trioxide in flue gas is removed.
2. remove the method for sulfur trioxide in coal-fired flue-gas as claimed in claim 1, it is characterized in that: the calcium hydroxide obtained in described steps A or magnesium hydroxide or sodium acid carbonate or sodium carbonate particle particle diameter are less than 50 μm; The injection direction spraying calcium hydroxide or magnesia or magnesium hydroxide or sodium acid carbonate or powdered sodium carbonate in described step D in flue gas is that the direction of flow of flue gas is consistent, and in per unit volume flue gas, the emitted dose of calcium hydroxide or magnesia or magnesium hydroxide or sodium acid carbonate or powdered sodium carbonate is 2-6 times of the molal quantity needing the sulfur trioxide removed.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105879620A (en) * | 2016-05-12 | 2016-08-24 | 大唐环境产业集团股份有限公司 | Two-stage flue gas sulphur trioxide removing device and method for flue gas purification |
| CN106110873A (en) * | 2016-08-23 | 2016-11-16 | 华电电力科学研究院 | Combine before and after removing SCR denitration device SO in flue gas3and the device of flue dust |
| CN106178926A (en) * | 2016-07-26 | 2016-12-07 | 华中科技大学 | One utilizes Na2cO3sO in removing boiler tail flue gas3method |
| CN106861375A (en) * | 2017-04-25 | 2017-06-20 | 广州冉升环保工程有限公司 | The device and method that a kind of sulfur trioxide in flue gas is administered |
| CN107158925A (en) * | 2017-07-05 | 2017-09-15 | 山西新唐工程设计股份有限公司 | A kind of SCR boilers air preheater anti-blocking method |
| CN107661693A (en) * | 2016-07-28 | 2018-02-06 | 哈尔滨博深科技发展有限公司 | A kind of method and combined system of the flue gas denitrification system stable operations of SCR in low- load conditions |
| CN109847689A (en) * | 2019-01-09 | 2019-06-07 | 西安热工研究院有限公司 | It is a kind of for removing the adsorbent and preparation method thereof of sulfur trioxide in flue gas, heavy metal simultaneously |
| CN110090550A (en) * | 2019-04-17 | 2019-08-06 | 昆明理工大学 | A kind of coke oven flue gas sulfur method thermally decomposed in advance based on magnesium salts |
| CN111375371A (en) * | 2018-12-31 | 2020-07-07 | 中国石油化工股份有限公司 | SO (SO)3Adsorbent and preparation method thereof |
| CN115999499A (en) * | 2022-12-27 | 2023-04-25 | 国家电投集团远达环保工程有限公司 | Be used for desorption SO in flue gas 3 Is an adsorbent of (a) and a process for producing the same |
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| US6299848B1 (en) * | 1998-09-25 | 2001-10-09 | Hamon Research-Cottrell | Process for removing sulfur dioxide out of a gas |
| CN101522287A (en) * | 2005-02-04 | 2009-09-02 | 环技公司 | Targeted duct injection for SO3 control |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105879620A (en) * | 2016-05-12 | 2016-08-24 | 大唐环境产业集团股份有限公司 | Two-stage flue gas sulphur trioxide removing device and method for flue gas purification |
| CN105879620B (en) * | 2016-05-12 | 2019-04-16 | 大唐环境产业集团股份有限公司 | A kind of two-stage sulfur trioxide in flue gas removing means and method for gas cleaning |
| CN106178926A (en) * | 2016-07-26 | 2016-12-07 | 华中科技大学 | One utilizes Na2cO3sO in removing boiler tail flue gas3method |
| CN107661693A (en) * | 2016-07-28 | 2018-02-06 | 哈尔滨博深科技发展有限公司 | A kind of method and combined system of the flue gas denitrification system stable operations of SCR in low- load conditions |
| CN106110873A (en) * | 2016-08-23 | 2016-11-16 | 华电电力科学研究院 | Combine before and after removing SCR denitration device SO in flue gas3and the device of flue dust |
| CN106861375A (en) * | 2017-04-25 | 2017-06-20 | 广州冉升环保工程有限公司 | The device and method that a kind of sulfur trioxide in flue gas is administered |
| CN107158925A (en) * | 2017-07-05 | 2017-09-15 | 山西新唐工程设计股份有限公司 | A kind of SCR boilers air preheater anti-blocking method |
| CN111375371A (en) * | 2018-12-31 | 2020-07-07 | 中国石油化工股份有限公司 | SO (SO)3Adsorbent and preparation method thereof |
| CN111375371B (en) * | 2018-12-31 | 2022-11-11 | 中国石油化工股份有限公司 | SO (SO) 3 Adsorbent and preparation method thereof |
| CN109847689A (en) * | 2019-01-09 | 2019-06-07 | 西安热工研究院有限公司 | It is a kind of for removing the adsorbent and preparation method thereof of sulfur trioxide in flue gas, heavy metal simultaneously |
| CN110090550A (en) * | 2019-04-17 | 2019-08-06 | 昆明理工大学 | A kind of coke oven flue gas sulfur method thermally decomposed in advance based on magnesium salts |
| CN115999499A (en) * | 2022-12-27 | 2023-04-25 | 国家电投集团远达环保工程有限公司 | Be used for desorption SO in flue gas 3 Is an adsorbent of (a) and a process for producing the same |
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Application publication date: 20150401 |