CN103968402A - Flue gas denitrification system of coal-fired unit - Google Patents
Flue gas denitrification system of coal-fired unit Download PDFInfo
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- CN103968402A CN103968402A CN201410166410.3A CN201410166410A CN103968402A CN 103968402 A CN103968402 A CN 103968402A CN 201410166410 A CN201410166410 A CN 201410166410A CN 103968402 A CN103968402 A CN 103968402A
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Abstract
The invention discloses a flue gas denitrification system of a coal-fired unit with a complete flue gas denitrification reaction. The flue gas denitrification system comprises a boiler body, a denitrification reactor and coal economizers, the boiler body, and the denitrification reactor are connected together through a flue, denitrification catalysts are contained in the denitrification reactor, the coal economizers comprise the first coal economizer and the second coal economizer, the first coal economizer is arranged in a tail fuel on the boiler body, the second coal economizer is arranged at the position where flue gas passes after the flue gas flows through the denitrification catalysts, the first coal economizer and the second coal economizer are connected in series, the second coal economizer is connected with a water supply pipe, and the first coal economizer is connected with a water outlet pipe.
Description
Technical field
The present invention relates to a kind of flue gas denitrification system of coal-fired unit.
Background technology
The denitrating flue gas of current coal-fired unit is the necessary project of environmental requirement, is to ensure effect and the quality of denitrating flue gas, must make to enter the flue-gas temperature of Benitration reactor within the specific limits.The flue gas denitrification system of general coal-fired unit, comprise boiler body, economizer and Benitration reactor, economizer is arranged on the back-end ductwork place of boiler body, but because on boiler body, economizer heat exchange area is large, heat exchange is abundant, make under coal-fired unit low load condition, on the low side by the flue-gas temperature out of the economizer on boiler body, can not meet the requirement of denitration, make the denitration reaction system can not bringing normally into operation, therefore denitration reaction be incomplete, still can be to environment.
Summary of the invention
Technical problem to be solved by this invention is: the flue gas denitrification system that the coal-fired unit that a kind of denitrating flue gas reacts completely is provided.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of flue gas denitrification system of coal-fired unit, comprise the boiler body and the Benitration reactor that link together by flue, and economizer, in Benitration reactor, be provided with denitrating catalyst, described economizer comprises the first economizer and the second economizer, the first economizer is arranged in the back-end ductwork on boiler body, the second economizer is arranged on smoke gas flow and crosses the denitrating catalyst position of process afterwards, the first economizer is connected with the second economizer, and the second economizer is connected with feed pipe, the first economizer is connected with outlet pipe.
Described Benitration reactor exit is provided with air preheater by flue.
Described the second economizer is arranged on the below of denitrating catalyst in Benitration reactor.
Described the second economizer is arranged in the flue between Benitration reactor and air preheater.
The invention has the beneficial effects as follows: owing to economizer being divided for the first economizer and the second economizer, the first economizer is arranged in the back-end ductwork on boiler body, the second economizer is arranged on smoke gas flow and crosses the denitrating catalyst position of process afterwards, the first economizer is connected with the second economizer, and the second economizer is connected with feed pipe, the first economizer is connected with outlet pipe, even if make the flue-gas temperature that enters Benitration reactor under coal-fired unit low load condition also can meet denitration reaction requirement, thereby guarantee that denitrating flue gas is complete.And in the time that unit load changes, the cigarette temperature scope that enters Benitration reactor is dwindled, and is conducive to ensure the high efficiency of denitration, thereby has also reduced operating cost, has improved environmental quality.
Because Benitration reactor exit is provided with air preheater by flue, improve the thermal efficiency of whole system.
Because the second economizer is arranged on the below of denitrating catalyst in Benitration reactor, this place's installing space is convenient to greatly the fitting operation of the second economizer, this place's flue gas flow rate distribution is comparatively even in addition, also more uniform to the wearing and tearing of the second economizer, the service life that can improve the second economizer.
Brief description of the drawings
Fig. 1 is structural representation of the present invention.
In Fig. 1: 1. flue, 2. boiler body, 3. Benitration reactor, 31. denitrating catalysts, 4. flue, 5. air preheater, 6. the first economizer, 7. the second economizer, 8. feed pipe, 9. outlet pipe.
Detailed description of the invention
Below in conjunction with accompanying drawing, describe specific embodiment of the invention scheme in detail.
As shown in Figure 1, a kind of flue gas denitrification system of coal-fired unit, comprise the boiler body 2 and Benitration reactor 3 and the economizer that link together by flue 1, be provided with denitrating catalyst 31 in Benitration reactor 3, Benitration reactor 3 exits are provided with air preheater 5 by flue 4.Described economizer comprises the first economizer 6 and the second economizer 7.The first economizer 6 is arranged in the back-end ductwork on boiler body 2, and the second economizer 7 is arranged on the below of the interior denitrating catalyst 31 of Benitration reactor 3.The first economizer 6 is connected with the second economizer 7, and the second economizer 7 is connected with feed pipe 8, and the first economizer 6 is connected with outlet pipe 9.
The above embodiments are principle and effect thereof of illustrative the invention only, and the embodiment of part utilization, but not for limiting the present invention; It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise of the invention, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (4)
1. the flue gas denitrification system of a coal-fired unit, comprise the boiler body and Benitration reactor and the economizer that link together by flue, in Benitration reactor, be provided with denitrating catalyst, it is characterized in that: described economizer comprises the first economizer and the second economizer, the first economizer is arranged in the back-end ductwork on boiler body, the second economizer is arranged on smoke gas flow and crosses the denitrating catalyst position of process afterwards, the first economizer is connected with the second economizer, and the second economizer is connected with feed pipe, the first economizer is connected with outlet pipe.
2. the flue gas denitrification system of a kind of coal-fired unit as claimed in claim 1, is characterized in that: described Benitration reactor exit is provided with air preheater by flue.
3. the flue gas denitrification system of a kind of coal-fired unit as claimed in claim 2, is characterized in that: described the second economizer is arranged on the below of denitrating catalyst in Benitration reactor.
4. the flue gas denitrification system of a kind of coal-fired unit as claimed in claim 2, is characterized in that: described the second economizer is arranged in the flue between Benitration reactor and air preheater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410166410.3A CN103968402A (en) | 2014-04-24 | 2014-04-24 | Flue gas denitrification system of coal-fired unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410166410.3A CN103968402A (en) | 2014-04-24 | 2014-04-24 | Flue gas denitrification system of coal-fired unit |
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| CN103968402A true CN103968402A (en) | 2014-08-06 |
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| CN201410166410.3A Pending CN103968402A (en) | 2014-04-24 | 2014-04-24 | Flue gas denitrification system of coal-fired unit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104534492A (en) * | 2014-12-25 | 2015-04-22 | 哈尔滨锅炉厂有限责任公司 | Device and method for increasing denitration inlet gas temperature |
| CN105570956A (en) * | 2016-03-12 | 2016-05-11 | 河北工业大学 | Boiler flue gas waste heat circulating heat-supply system |
| CN110332514A (en) * | 2019-08-22 | 2019-10-15 | 哈尔滨锅炉厂有限责任公司 | A kind of efficient wide load double reheat tower-type furnace economizer hierarchical arrangement system |
| CN111603928A (en) * | 2020-05-24 | 2020-09-01 | 西安交通大学 | Efficient, clean and flexible cooperative coal-fired power generation system and operation method |
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| JPS5315639A (en) * | 1976-07-27 | 1978-02-13 | Hitachi Zosen Corp | Boiler has denitration device built-in |
| US20040045513A1 (en) * | 2002-09-06 | 2004-03-11 | Mcnertney Robert M. | Passive system for optimal NOx reduction via selective catalytic reduction with variable boiler load |
| CN102430306A (en) * | 2011-09-14 | 2012-05-02 | 无锡华光新动力环保科技股份有限公司 | Pre-dedusting device used in SCR flue gas denitration for coal-fired boiler |
| CN202709159U (en) * | 2012-07-05 | 2013-01-30 | 东方电气集团东方锅炉股份有限公司 | Boiler capable of meeting full-load operation low exhaust temperature of selective catalytic reduction (SCR) denitration device |
| CN102937295A (en) * | 2012-11-20 | 2013-02-20 | 上海锅炉厂有限公司 | Boiler economizer arrangement form suitable for denitration device negative whole process load operation |
| CN203464231U (en) * | 2013-09-16 | 2014-03-05 | 山西大唐国际临汾热电有限责任公司 | Mounting structure of coal economizer |
| CN203797683U (en) * | 2014-04-24 | 2014-08-27 | 江苏申港锅炉有限公司 | Flue gas denitration system of coal-fired unit |
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2014
- 2014-04-24 CN CN201410166410.3A patent/CN103968402A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5315639A (en) * | 1976-07-27 | 1978-02-13 | Hitachi Zosen Corp | Boiler has denitration device built-in |
| US20040045513A1 (en) * | 2002-09-06 | 2004-03-11 | Mcnertney Robert M. | Passive system for optimal NOx reduction via selective catalytic reduction with variable boiler load |
| CN102430306A (en) * | 2011-09-14 | 2012-05-02 | 无锡华光新动力环保科技股份有限公司 | Pre-dedusting device used in SCR flue gas denitration for coal-fired boiler |
| CN202709159U (en) * | 2012-07-05 | 2013-01-30 | 东方电气集团东方锅炉股份有限公司 | Boiler capable of meeting full-load operation low exhaust temperature of selective catalytic reduction (SCR) denitration device |
| CN102937295A (en) * | 2012-11-20 | 2013-02-20 | 上海锅炉厂有限公司 | Boiler economizer arrangement form suitable for denitration device negative whole process load operation |
| CN203464231U (en) * | 2013-09-16 | 2014-03-05 | 山西大唐国际临汾热电有限责任公司 | Mounting structure of coal economizer |
| CN203797683U (en) * | 2014-04-24 | 2014-08-27 | 江苏申港锅炉有限公司 | Flue gas denitration system of coal-fired unit |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104534492A (en) * | 2014-12-25 | 2015-04-22 | 哈尔滨锅炉厂有限责任公司 | Device and method for increasing denitration inlet gas temperature |
| CN105570956A (en) * | 2016-03-12 | 2016-05-11 | 河北工业大学 | Boiler flue gas waste heat circulating heat-supply system |
| CN105570956B (en) * | 2016-03-12 | 2018-03-16 | 河北工业大学 | A kind of residual heat from boiler fume circulating heat supply system |
| CN110332514A (en) * | 2019-08-22 | 2019-10-15 | 哈尔滨锅炉厂有限责任公司 | A kind of efficient wide load double reheat tower-type furnace economizer hierarchical arrangement system |
| CN111603928A (en) * | 2020-05-24 | 2020-09-01 | 西安交通大学 | Efficient, clean and flexible cooperative coal-fired power generation system and operation method |
| CN111603928B (en) * | 2020-05-24 | 2021-07-06 | 西安交通大学 | Efficient, clean and flexible cooperative coal-fired power generation system and operation method |
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Application publication date: 20140806 |