CN103007751A - Process system utilizing preheated air to achieve flue gas denitration - Google Patents
Process system utilizing preheated air to achieve flue gas denitration Download PDFInfo
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- CN103007751A CN103007751A CN2012105601405A CN201210560140A CN103007751A CN 103007751 A CN103007751 A CN 103007751A CN 2012105601405 A CN2012105601405 A CN 2012105601405A CN 201210560140 A CN201210560140 A CN 201210560140A CN 103007751 A CN103007751 A CN 103007751A
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- ammonia
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- ammonia gas
- air preheater
- gas
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Abstract
The invention provides a process system utilizing preheated air to achieve flue gas deniftration, which comprises an air preheater, reactor activator layers, an ammonia injection grid, an ammonia gas conveying pipe, an ammonia gas preparation system, an ammonia gas diluting system, and an air preheater main pipe. The ammonia gas diluting system comprises an air preheater diluting pipe, an ammonia/air mixer and a connecting pipe; and all the ammonia injection grid and the reactor activator layers are mounted in a gas flue. The ammonia gas preparation system is connected with ammonia/air mixer via the ammonia gas conveying pipe. Air is changed into preheated air via the air preheater and then enters the air preheater main pipe, and is led to the ammonia gas diluting system connected with the air preheater main pipe; the ammonia gas is led out from the ammonia gas preparation system via the ammonia gas conveying pipe; the ammonia gas and the preheated air are mixed and diluted in the ammonia gas diluting system, the volume percent of the ammonia gas is kept to be less 5 percent, and the ammonia gas is preheated to a certain temperature; the diluted ammonia gas further enters the gas flue via the connecting pipe, and is directly mixed with flue gas generated by a boiler via the ammonia injection grid mounted in the gas flue, and finally, the denitration of the flue gas is completed under the action of a reactor activator.
Description
Technical field
The invention belongs to the Thermal Power Engineering applied technical field, be specifically related to a kind of process system that utilizes preheated air to realize denitrating flue gas.
Background technology
The environment in recent years problem is day by day serious, and nitrogen oxide (NOx) is just replacing SO
2Become the primary pollution source of China's atmosphere acid rain, the situation is tense in environmental improvement.National environmental protection section and State Administration for Quality Supervision and Inspection and Quarantine and united in 2010 and issued fossil-fuel power plant atmospheric pollutant emission standard (secondary exposure draft); whole nation Thermal Power Enterprises active service and new-built unit are carried out new standard on January 1st, 2014; after the mandatory provision all 2012 new-built unit and before 2012 not by the unit of environmental impact assessment evaluation, its discharged nitrous oxides higher limit is 100mg/m
3Two kinds of the selective catalytic reduction method of gas denitrifying technology (SCR) that present China is commonly used and SNCR methods (SNCR), day by day raising along with the Environmental Protection in China requirement, selective catalytic reduction (SCR) is because its higher percent reduction and technology maturity, in the extensive use of the industries such as electric power and chemical industry, now become the mainstream technology that domestic denitrating flue gas is administered.
The SCR technology was at first grown up by Japan at the end of the seventies in last century and the beginning of the eighties, rapidly in Europe and the U.S. promote thereafter, the SCR technology is as the present best technology of denitration effect, denitration efficiency reaches as high as more than 90%, its cardinal principle is that tail flue gas is in lower temperature range (280-450 ℃), under the effect of catalyst (alkali metal compounds such as iron, vanadium, cobalt), reduction reaction occurs, chemical equation is as follows:
4NH
3+4NO+O
2 
4N
2+6H
2O (1)
4NH
3+2NO
2+O
2 
3N
2+6H
2O (2)
Domestic SCR technology all is to continue to use state's external mature technology at present, when the dilution ammonia, utilizes dilution air that air is delivered to ammonia dilution system (as shown in Figure 1).The power consumption of dilution air accounts for more than 50% of the total power consumption of SCR system, if the dilution air fault, whole SCR denitrating system just has the danger of stoppage in transit, and denitration efficiency can not be guaranteed.
Summary of the invention
Technical problem to be solved by this invention is, deficiency for present prior art existence, a kind of process system that utilizes preheated air to realize denitrating flue gas is provided, needn't acquire dilution air, utilize the heat of preheated air to realize denitration, greatly shorten the denitration reaction time, reduce system's power consumption, promoted denitrating flue gas efficient.
The present invention is that the technical scheme that its technical problem of solution adopts is: comprise air preheater, reactor catalyst layer, ammonia-spraying grid, ammonia carrier pipe, ammonia preparation system, ammonia dilution system, the female pipe of air preheater etc.
Above-mentioned ammonia dilution system comprises air preheater dilution pipeline, ammonia/air mixer and connecting line; Air preheater dilution pipeline one end is drawn from the female pipe of air preheater, and the other end links to each other with ammonia/air mixer; Connecting line then leads to flue from ammonia/air mixer.
Above-mentioned ammonia-spraying grid, reactor catalyst layer are installed in the flue, and assurance dilution ammonia fully mixes with flue gas, and ammonia-spraying grid is in the front of reactor catalyst layer.
Above-mentioned ammonia preparation system links to each other with ammonia/air mixer by the ammonia carrier pipe.
During work, air becomes preheated air through behind the air preheater, enter the female pipe of air preheater, by the air preheater dilution pipeline that is attached thereto preheated air is passed into described ammonia/air mixer, after ammonia is drawn from the ammonia preparation system by the ammonia carrier pipe, finish the mixed diluting process with preheated air in ammonia/air mixer, the percent by volume of assurance ammonia＜5% is preheating to uniform temperature with ammonia simultaneously; Ammonia after the dilution passes into flue by connecting line again, and directly mixes with the flue gas that boiler produces by the ammonia-spraying grid that is installed in the flue, finishes the denitrification process of flue gas at last under the effect of reactor catalyst.
The invention has the beneficial effects as follows:
(1) increases air preheater dilution pipeline, directly preheated air has been introduced ammonia/air mixer, can in advance ammonia be heated to uniform temperature, reduced dilution ammonia required heat time heating time in flue, greatly promoted denitration efficiency;
(2) do not establish dilution air, greatly reduce power consumption, increased the safe operation coefficient;
(3) mode that adopts preheated air to mix with ammonia is mixed better effects if than directly drawing air with ammonia;
(4) diluent air is directly drawn from the female pipe of air preheater, reduces the inleakage of system, has guaranteed the efficient of boiler, also effectively reduces follow-up equipment to the treating capacity of flue gas simultaneously, and is more energy-conservation;
(5) process system of the present invention is simple, saves investment and operation cost.
Description of drawings
Fig. 1 is the prior art processes system schematic;
Fig. 2 is process system schematic diagram of the present invention;
Fig. 3 is ammonia dilution system schematic diagram.
Among the figure: 1 for air preheater, 2 for the reactor catalyst layer, 3 for flue, 4 for ammonia-spraying grid, 5 for the ammonia carrier pipe, 6 for the ammonia preparation system, 7 for ammonia dilution system, 7-1 be that connecting line, 7-2 are that ammonia/air mixer, 7-3 are that air preheater dilution pipeline, 8 is dilution air for the female pipe of air preheater, 9.
The specific embodiment
The invention will be further described below with reference to the drawings and specific embodiments.
This specific embodiment provides a kind of process system that utilizes preheated air to realize denitrating flue gas, comprises air preheater 1, reactor catalyst layer 2, ammonia-spraying grid 4, ammonia carrier pipe 5, ammonia preparation system 6, ammonia dilution system 7, the female pipe 8 of air preheater etc.
Described ammonia dilution system comprises air preheater dilution pipeline 7-3, ammonia/air mixer 7-2 and connecting line 7-1; Air preheater dilution pipeline 7-3 one end is drawn from the female pipe 8 of air preheater, and the other end links to each other with ammonia/air mixer 7-2; Connecting line 7-1 then leads to flue 3 from ammonia/air mixer 7-2.
Described ammonia-spraying grid 4, reactor catalyst layer 2 are installed in the flue 3, and assurance dilution ammonia fully mixes with flue gas, and ammonia-spraying grid 4 is in the front of reactor catalyst layer 2.
Described ammonia preparation system 2 links to each other with ammonia/air mixer 7-2 by ammonia carrier pipe 5.
During work, as shown in Figure 2, air enters the female pipe 8 of air preheater through becoming preheated air behind the air preheater 1, by the air preheater dilution tube 7-3 road that is attached thereto preheated air is passed into ammonia/air mixer 7-2, after ammonia is drawn from ammonia preparation system 6 by ammonia carrier pipe 5, finish the mixed diluting process with preheated air in ammonia/air mixer 7-2, the percent by volume of assurance ammonia＜5% is preheating to uniform temperature with ammonia simultaneously; Ammonia after the dilution passes into flue 3 by connecting line 7-1 again, and directly mixes with the flue gas that boiler produces by the ammonia-spraying grid 4 that is installed in the flue 3, finishes the denitrification process of flue gas at last under the effect of reactor catalyst layer 2.Prior art as shown in Figure 1 then is directly air to be sent among ammonia/air mixer 7-2 by dilution air 9 to mix with ammonia, and effect is not all right, and the power consumption of dilution air 9 is too large.
Claims (2)
1. process system that utilizes preheated air to realize denitrating flue gas, comprise air preheater, the reactor catalyst layer, ammonia-spraying grid, the ammonia carrier pipe, the ammonia preparation system, the ammonia dilution system, the female pipe of air preheater, it is characterized in that: air enters the female pipe of air preheater through becoming preheated air behind the air preheater, pass into the ammonia dilution system that is attached thereto, after ammonia is drawn from the ammonia preparation system by the ammonia carrier pipe, in the ammonia dilution system, finish the mixed diluting process with preheated air, the percent by volume of assurance ammonia＜5% is preheating to uniform temperature with ammonia simultaneously; Ammonia after the dilution passes into flue by connecting line again, and directly mixes with the flue gas that boiler produces by the ammonia-spraying grid that is installed in the flue, finishes the denitrification process of flue gas at last under the effect of reactor catalyst.
2. described a kind of process system that utilizes preheated air to realize denitrating flue gas according to claim 1, it is characterized in that: described ammonia dilution system comprises air preheater dilution pipeline, ammonia/air mixer and connecting line; Air preheater dilution pipeline one end is drawn from the female pipe of air preheater, and the other end links to each other with ammonia/air mixer; Connecting line then leads to flue from ammonia/air mixer.
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| CN2012105601405A CN103007751A (en) | 2012-12-21 | 2012-12-21 | Process system utilizing preheated air to achieve flue gas denitration |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104548930A (en) * | 2014-12-29 | 2015-04-29 | 大连贝斯特环境工程设备有限公司 | Selective catalytic reduction (SCR) denitration method and device for ammonia water |
| CN108573102A (en) * | 2018-04-12 | 2018-09-25 | 国网天津市电力公司电力科学研究院 | A kind of SCR denitration device air leak rate of air curtain computational methods |
| CN115920627A (en) * | 2022-05-31 | 2023-04-07 | 中国石油天然气集团有限公司 | Industrial furnace denitration system and method |
Citations (7)
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| JPH0731845A (en) * | 1993-06-28 | 1995-02-03 | Mitsubishi Heavy Ind Ltd | Cooling method of leaking ammonia recovering apparatus |
| CN1879947A (en) * | 2005-04-13 | 2006-12-20 | 巴布考克及威尔考克斯公司 | Carrier air heating system for SCR |
| CN201108807Y (en) * | 2007-08-24 | 2008-09-03 | 中电投远达环保工程有限公司 | Horizontal SCR denitrating reaction device |
| CN101439260A (en) * | 2008-12-04 | 2009-05-27 | 浙江大学 | System for removing nitrous oxides in low-temperature flue gas and technique thereof |
| CN201524525U (en) * | 2009-09-11 | 2010-07-14 | 宇星科技发展(深圳)有限公司 | SCR flue gas denitrating device |
| CN201534059U (en) * | 2009-06-12 | 2010-07-28 | 北京中电联环保工程有限公司 | Renewable heat-accumulating type selective catalytic reduction denitration device |
| US20110005438A1 (en) * | 2007-12-05 | 2011-01-13 | Bernd Polster | Method For The Selective Catalytic Reduction Of Nitrogen Oxides In Combustion Flue Gases And System For Implementing It |
-
2012
- 2012-12-21 CN CN2012105601405A patent/CN103007751A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0731845A (en) * | 1993-06-28 | 1995-02-03 | Mitsubishi Heavy Ind Ltd | Cooling method of leaking ammonia recovering apparatus |
| CN1879947A (en) * | 2005-04-13 | 2006-12-20 | 巴布考克及威尔考克斯公司 | Carrier air heating system for SCR |
| CN201108807Y (en) * | 2007-08-24 | 2008-09-03 | 中电投远达环保工程有限公司 | Horizontal SCR denitrating reaction device |
| US20110005438A1 (en) * | 2007-12-05 | 2011-01-13 | Bernd Polster | Method For The Selective Catalytic Reduction Of Nitrogen Oxides In Combustion Flue Gases And System For Implementing It |
| CN101439260A (en) * | 2008-12-04 | 2009-05-27 | 浙江大学 | System for removing nitrous oxides in low-temperature flue gas and technique thereof |
| CN201534059U (en) * | 2009-06-12 | 2010-07-28 | 北京中电联环保工程有限公司 | Renewable heat-accumulating type selective catalytic reduction denitration device |
| CN201524525U (en) * | 2009-09-11 | 2010-07-14 | 宇星科技发展(深圳)有限公司 | SCR flue gas denitrating device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104548930A (en) * | 2014-12-29 | 2015-04-29 | 大连贝斯特环境工程设备有限公司 | Selective catalytic reduction (SCR) denitration method and device for ammonia water |
| CN108573102A (en) * | 2018-04-12 | 2018-09-25 | 国网天津市电力公司电力科学研究院 | A kind of SCR denitration device air leak rate of air curtain computational methods |
| CN115920627A (en) * | 2022-05-31 | 2023-04-07 | 中国石油天然气集团有限公司 | Industrial furnace denitration system and method |
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Application publication date: 20130403 |