CN104785086A - Device for denitration, desulfurization and demercuration of smoke gas of boiler flue - Google Patents
Device for denitration, desulfurization and demercuration of smoke gas of boiler flue Download PDFInfo
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- CN104785086A CN104785086A CN201510144734.1A CN201510144734A CN104785086A CN 104785086 A CN104785086 A CN 104785086A CN 201510144734 A CN201510144734 A CN 201510144734A CN 104785086 A CN104785086 A CN 104785086A
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Abstract
The invention relates to a device for denitration, desulfurization and demercuration of smoke gas of a boiler flue. The device comprises a boiler body which is connected with the device through the flue, wherein a cyclone dust remover, a denitration reactor, an coal economizer, an air preheater, an electric dust remover, a desulfurization device, a demercuration device and a chimney are successively arranged in the advancing direction of the smoke gas; a dry ash bin is connected to a position under the cyclone dust remover through a pipeline and used for storing large-particle dry ash; the denitration reactor is used for removing nitrogen oxide in the smoke gas; the coal economizer is positioned under the denitration reactor; the air preheater is used for recycling heat in gas of which the nitrogen oxide is removed; the electric dust remover is used for removing dust in gas of which the heat is recycled; the desulfurization device and the demercuration device are respectively used for removing sulfur oxide and mercury in gas in which the dust is removed; the chimney is used for further exhausting purified gas outwards through a draught fan after denitration, desulfurization and demercuration of the smoke gas.
Description
Technical field
The present invention relates to pulverized-coal fired boiler technical field, be specifically related to a kind of denitrating flue gas desulfuration demercuration device of boiler flue.
Background technology
Environmental protection relates to prevention to phenomenons such as waste gas, waste water, dust, noise, light pollution and improvement.Nitrogen oxide (based on NO) and sulfur dioxide are at present by the atmosphere pollution of global extensive concern, have a large amount of nitrogen oxide and sulfur dioxide to enter air every year, cause serious environmental pollution and have very large harm to human body.Mercury is a kind of hypertoxicity material, all can cause serious harm to the cell of organism, organ and nerve, it is difficult to degraded simultaneously, forever can accumulate in biological chain, cause the pathology of living organism, methyl mercury even can injure chromosome and have an impact to gene.
China is abundant because coal stores, and coal is the most important primary energy of Dou Shi China all the time, and coal combustion is the main source of China's mercury emissions, and wherein electric power, steam, hot water account for 74% for the coal-fired mercury emissions caused of application.Limited owing to not formulating relevant mercury emissions standard and statute in early days, make China's mercury pollution very serious, current China mercury emissions accounts for 3/4 of East Asia and Southeast Asia, is about 1/3 of the total release of global mercury.Carrying out demercuration process to the flue gas of coal-fired boiler combustion discharge is the important channel reducing mercury emissions, very urgent.
The units such as steam power plant all use large-scale boiler, boiler can produce a large amount of flue gases in running, exist containing the mercurous toxic compounds of nitre sulfur-bearing in boiler smoke, if these toxic compounds are directly discharged in air, severe contamination can be caused, affect atmospheric environment, therefore the process of boiler smoke is extremely important
At present, about removing the technique comparative maturity of sulfur dioxide in flue gas, nitrogen oxide and mercury, carry out large-scale industrial application already, but most technique is all only useful for one-component.Nitrogen oxides in effluent, sulfur dioxide and mercury often exist simultaneously, if utilize these equipment that can only process Single Pollution thing to remove respectively, have that floor space is large, high in cost of production problem.Therefore, the technology of research and development simultaneous SO_2 and NO removal demercuration further, the control for atmosphere pollution is significant.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the invention provides a kind of denitrating flue gas desulfuration demercuration device of boiler flue, its structure is simple, and efficiency of construction is high, and effectively can ensure the high efficiency of denitration desulfurization mercury, improves environmental quality.
The present invention realizes with following technical scheme, a kind of denitrating flue gas desulfuration demercuration device of boiler flue, comprise the boiler furnace linked together by flue, on flue gas direct of travel, be disposed with cyclone dust collectors, for removing the Benitration reactor of the nitrogen oxide in flue gas, be positioned at the economizer below Benitration reactor, gas is by becoming the gas after desulfurization and denitration after desulfurizer, described gas filters out mercury element by mercury removal device, become the Purge gas after the out of stock demercuration of desulfurization, the chimney that described Purge gas merits and demerits air-introduced machine is externally discharged, containing mixed solution in described mercury removal device, described mixed solution comprises vulcanized sodium and ferric sulfate.
Preferably, described mercury removal device is a gyratory agitation device, rotating speed 370 ~ 390r/min, and one time demercuration needs stirring 16 ~ 23min.
Preferably, a dry ash storehouse is connected by pipeline below described cyclone dust collectors.
Preferably, the air preheater of the heat in the gas after reclaiming removing nitrogen oxide is also comprised.
Preferably, the gas through described air preheater enters electric cleaner, and enters desulfurizer by described electric cleaner, and described desulfurizer is for the oxysulfide in gas after further removing dedusting.
Preferably, the desulfurizing agent used in described desulfurizer contains ammoniacal liquor.
Preferably, the mass fraction of described ammoniacal liquor in described desulfurizing agent is 10% ~ 16%.
Preferably, the temperature of the denitration reaction in described Benitration reactor is 15 ~ 55 DEG C, and pH value is 6.5 ~ 8.5, in described desulfurizer 9, the temperature of desulphurization reaction is 15 ~ 55 DEG C, and pH value is 5.5 ~ 7.5, and in described mercury removal device 10, demercuration reaction temperature is 20 ~ 55 DEG C, pH value is 7 ~ 10.
Preferably, the ammonia sprayed into mixes with flue gas by described Benitration reactor, and fully after mixing, reducing agent reacts with the NOx in flue gas under the effect of catalyst, generates nitrogen and water.
Preferably, described catalyst is honeycomb catalyst, and aperture is 2-6mm, and the active component of described honeycomb catalyst is transition metal oxide.
The invention has the beneficial effects as follows:
The invention provides a kind of device of denitrating flue gas desulfuration demercuration of boiler flue, the present invention first processes oarse-grained dry ash by arranging cyclone dust collectors, arranges economizer further below Benitration reactor, thus improves flue-gas temperature; Be provided with air preheater in Benitration reactor exit by flue, improve the thermal efficiency of whole device, simultaneous SO_2 and NO removal demercuration is respond well.
Accompanying drawing explanation
Fig. 1 is a kind of operating diagram of device of denitrating flue gas desulfuration demercuration of boiler flue.
Wherein, 1-boiler furnace, 2-cyclone dust collectors, 3-dry ash storehouse, 4-flue, 5-Benitration reactor, 6-economizer, 7-air preheater, 8-electric cleaner, 9-desulfurizer, 10-mercury removal device, 11-air-introduced machine, 12-chimney.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.
In one embodiment, as shown in Figure 1, comprise the boiler furnace 1 linked together by flue 4, on flue gas direct of travel, be disposed with cyclone dust collectors 2, for removing the Benitration reactor of the nitrogen oxide in flue gas, be positioned at the economizer 6 below Benitration reactor 5, gas is by becoming the gas after desulfurization and denitration after desulfurizer 9, described gas filters out mercury element by mercury removal device 10, become the Purge gas after the out of stock demercuration of desulfurization, the chimney 12 that described Purge gas merits and demerits air-introduced machine 11 is externally discharged, containing mixed solution in described mercury removal device 10, described mixed solution comprises vulcanized sodium and ferric sulfate.
Described mercury removal device 10 is a gyratory agitation device, rotating speed 370r/min, and a demercuration needs to stir 16min.
A dry ash storehouse 3 is connected by pipeline below described cyclone dust collectors 2.
This device also comprises the air preheater 7 of the heat in the gas after reclaiming removing nitrogen oxide.
Gas through described air preheater enters electric cleaner 8, and enters desulfurizer 9 by described electric cleaner 8, and described desulfurizer 9 is for removing the oxysulfide after dedusting in gas further.
The desulfurizing agent used in described desulfurizer 9 contains ammoniacal liquor.The mass fraction of described ammoniacal liquor in described desulfurizing agent is 10%.
The temperature of the denitration reaction in described Benitration reactor 5 is 15 DEG C, and pH value is 6.5, and in described desulfurizer 9, the temperature of desulphurization reaction is 15 DEG C, and pH value is 5.5, and in described mercury removal device 10, demercuration reaction temperature is 20 DEG C, and pH value is 7.
The ammonia sprayed into mixes with flue gas by described Benitration reactor 5, and fully after mixing, reducing agent reacts with the NOx in flue gas under the effect of catalyst, generates nitrogen and water.Described catalyst is honeycomb catalyst, and aperture is 2mm, and the active component of described honeycomb catalyst is transition metal oxide.
Another embodiment, comprise the boiler furnace 1 linked together by flue 4, on flue gas direct of travel, be disposed with cyclone dust collectors 2, for removing the Benitration reactor of the nitrogen oxide in flue gas, be positioned at the economizer 6 below Benitration reactor 5, gas is by becoming the gas after desulfurization and denitration after desulfurizer 9, described gas filters out mercury element by mercury removal device 10, become the Purge gas after the out of stock demercuration of desulfurization, the chimney 12 that described Purge gas merits and demerits air-introduced machine 11 is externally discharged, containing mixed solution in described mercury removal device 10, described mixed solution comprises vulcanized sodium and ferric sulfate.
Described mercury removal device is a gyratory agitation device, rotating speed 390r/min, and a demercuration needs to stir 23min.
Preferably, a dry ash storehouse is connected by pipeline below described cyclone dust collectors.
Preferably, the air preheater of the heat in the gas after reclaiming removing nitrogen oxide is also comprised.
Preferably, the gas through described air preheater enters electric cleaner, and enters desulfurizer by described electric cleaner, and described desulfurizer is for the oxysulfide in gas after further removing dedusting.
Preferably, the desulfurizing agent used in described desulfurizer contains ammoniacal liquor.The mass fraction of described ammoniacal liquor in described desulfurizing agent is 16%.
The temperature of the denitration reaction in described Benitration reactor is 55 DEG C, and pH value is 8.5, and in described desulfurizer 9, the temperature of desulphurization reaction is 55 DEG C, and pH value is 7.5, and in described mercury removal device 10, demercuration reaction temperature is 55 DEG C, and pH value is 10.
The ammonia sprayed into mixes with flue gas by described Benitration reactor, and fully after mixing, reducing agent reacts with the NOx in flue gas under the effect of catalyst, generates nitrogen and water.
Described catalyst is honeycomb catalyst, and aperture is 6mm, and the active component of described honeycomb catalyst is transition metal oxide.
Above disclosedly be only present pre-ferred embodiments, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (10)
1. the denitrating flue gas desulfuration demercuration device of a boiler flue, it is characterized in that: comprise the boiler furnace (1) linked together by flue (4), on flue gas direct of travel, be disposed with cyclone dust collectors (2), for removing the Benitration reactor of the nitrogen oxide in flue gas, be positioned at the economizer (6) of Benitration reactor (5) below, gas is by becoming the gas after desulfurization and denitration after desulfurizer (9), described gas filters out mercury element by mercury removal device (10), become the Purge gas after the out of stock demercuration of desulfurization, the chimney (12) that described Purge gas merits and demerits air-introduced machine (11) is externally discharged, containing mixed solution in described mercury removal device (10), described mixed solution comprises vulcanized sodium and ferric sulfate.
2. the denitrating flue gas desulfuration demercuration device of a kind of boiler flue according to claim 1, it is characterized in that: described mercury removal device (10) is a gyratory agitation device, rotating speed 370 ~ 390r/min, one time demercuration needs stirring 16 ~ 23min.
3. the denitrating flue gas desulfuration demercuration device of a kind of boiler flue according to claim 1 and 2, is characterized in that: described cyclone dust collectors (2) below connects a dry ash storehouse (3) by pipeline.
4. the denitrating flue gas desulfuration demercuration device of a kind of boiler flue according to claim 3, is characterized in that: the air preheater (7) also comprising the heat in the gas after reclaiming removing nitrogen oxide.
5. the denitrating flue gas desulfuration demercuration device of a kind of boiler flue according to claim 4, it is characterized in that: the gas through described air preheater enters electric cleaner (8), and entering desulfurizer (9) by described electric cleaner (8), described desulfurizer (9) is for removing the oxysulfide after dedusting in gas further.
6. the denitrating flue gas desulfuration demercuration device of a kind of boiler flue according to claim 5, is characterized in that: the desulfurizing agent used in described desulfurizer (9) contains ammoniacal liquor.
7. according to the denitrating flue gas desulfuration demercuration device of a kind of boiler flue in claim 4-6 described in any one, it is characterized in that: the mass fraction of described ammoniacal liquor in described desulfurizing agent is 10% ~ 16%.
8. the denitrating flue gas desulfuration demercuration device of a kind of boiler flue according to claim 7, it is characterized in that: the temperature of the denitration reaction in described Benitration reactor (5) is 15 ~ 55 DEG C, pH value is 6.5 ~ 8.5, in described desulfurizer (9), the temperature of desulphurization reaction is 15 ~ 55 DEG C, pH value is 5.5 ~ 7.5, in described mercury removal device (10), demercuration reaction temperature is 20 ~ 55 DEG C, and pH value is 7 ~ 10.
9. the denitrating flue gas desulfuration demercuration device of a kind of boiler flue according to claim 8, it is characterized in that: the ammonia sprayed into mixes with flue gas by described Benitration reactor (5), after abundant mixing, reducing agent reacts with the NOx in flue gas under the effect of catalyst, generates nitrogen and water.
10. the denitrating flue gas desulfuration demercuration device of a kind of boiler flue according to claim 9, it is characterized in that: described catalyst is honeycomb catalyst, aperture is 2-6mm, and the active component of described honeycomb catalyst is transition metal oxide.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510144734.1A CN104785086A (en) | 2015-03-31 | 2015-03-31 | Device for denitration, desulfurization and demercuration of smoke gas of boiler flue |
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| CN201510144734.1A CN104785086A (en) | 2015-03-31 | 2015-03-31 | Device for denitration, desulfurization and demercuration of smoke gas of boiler flue |
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| CN104785086A true CN104785086A (en) | 2015-07-22 |
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| CN201510144734.1A Pending CN104785086A (en) | 2015-03-31 | 2015-03-31 | Device for denitration, desulfurization and demercuration of smoke gas of boiler flue |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105381698A (en) * | 2015-10-26 | 2016-03-09 | 中电投远达环保工程有限公司 | Mercury curing and removing method for coal-fired power plant and device thereof |
| CN106000037A (en) * | 2016-07-06 | 2016-10-12 | 北京国电龙源环保工程有限公司 | System and method for removing acid gas in smoke and assisting in desulfurization and denitrification |
| CN109647179A (en) * | 2017-10-11 | 2019-04-19 | 中山大学 | A kind of Membrane Bioreactor for Wastewater Treatment method of denitrating flue gas demercuration |
| CN112393264A (en) * | 2020-11-19 | 2021-02-23 | 郑州科技学院 | Boiler waste heat recycling system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103994456A (en) * | 2014-05-06 | 2014-08-20 | 浙江天地环保工程有限公司 | Integrated system for efficiently and synergistically removing multiple pollutants |
-
2015
- 2015-03-31 CN CN201510144734.1A patent/CN104785086A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103994456A (en) * | 2014-05-06 | 2014-08-20 | 浙江天地环保工程有限公司 | Integrated system for efficiently and synergistically removing multiple pollutants |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105381698A (en) * | 2015-10-26 | 2016-03-09 | 中电投远达环保工程有限公司 | Mercury curing and removing method for coal-fired power plant and device thereof |
| CN106000037A (en) * | 2016-07-06 | 2016-10-12 | 北京国电龙源环保工程有限公司 | System and method for removing acid gas in smoke and assisting in desulfurization and denitrification |
| CN109647179A (en) * | 2017-10-11 | 2019-04-19 | 中山大学 | A kind of Membrane Bioreactor for Wastewater Treatment method of denitrating flue gas demercuration |
| CN112393264A (en) * | 2020-11-19 | 2021-02-23 | 郑州科技学院 | Boiler waste heat recycling system |
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Application publication date: 20150722 |