CN105423322A - Low-load system increasing denitration flue gas temperature - Google Patents
Low-load system increasing denitration flue gas temperature Download PDFInfo
- Publication number
- CN105423322A CN105423322A CN201510945667.3A CN201510945667A CN105423322A CN 105423322 A CN105423322 A CN 105423322A CN 201510945667 A CN201510945667 A CN 201510945667A CN 105423322 A CN105423322 A CN 105423322A
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- Prior art keywords
- boiler
- flue
- denitration
- low
- flue gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention relates to a low-load system increasing the inlet flue gas temperature of a boiler denitration device. The system comprises two boiler tail vertical flues, and bypass flues are arranged on the two boiler tail vertical flues, are communicated and are provided with flue baffles. Compared with the prior art, the two boiler tail vertical flues are directly provided with the bypass flues capable of being communicated, when one boiler is at the start-up stage or at the low-load operation stage, the bypass flues can be opened, partial high-temperature flue gas of the one in normal operation of the two boiler tail vertical flues enters the tail vertical flue of the boiler at the low-load operation stage, and therefore the inlet flue gas temperature of the denitration device can be increased, and the NOx emission in flue gas can reach the standard. The system is flexible to operate, can meet various complex operation conditions of power plants and can guarantee that the denitration inlet flue gas temperature can meet the requirement no matter which one unit is at the low-load stage or at the start-up stage.
Description
Technical field
The present invention relates to the system that a kind of underload improves Denitration in Boiler device portal flue-gas temperature.
Background technology
Improving constantly along with national requirements for environmental protection at present, people more and more pay attention to the NOx emission in flue gas, national environmental protection portion proposes on June 19th, 2015 " writing a letter in reply of relevant issues of calling for bid about thermal power plant's SCR denitration system NOx emission under boiler at low load ruuning situation " (No. [2015] 143, ring letter): " when thermal power plant is at any operating load, all must qualified discharge.Denitrating system cannot run that the discharged nitrous oxides concentration that causes requires higher than emission limit, should regard as discharge beyond standards, and be imposed punishment in accordance with the law.", according to above require at present in the urgent need to a kind of can the system of Quick height boiler at low load denitrification apparatus entrance flue gas temperature.
Summary of the invention
The technical problem to be solved in the present invention is: existing boiler flue directly connects denitrification apparatus, and when boiler is when opening heater stage or underrun, the entrance flue gas temperature of denitrification apparatus is low, NO in flue gas
xdischarging not up to standard, for solving the problem, providing a kind of underload to improve the system of denitration cigarette temperature.
The object of the invention is to realize in the following manner:
Underload improves a system for denitration cigarette temperature, comprises two vertical flues of boiler tail, two vertical flues of boiler tail are all provided with bypass flue, and two bypass flues are communicated with, and bypass flue is provided with damper.
Be connected with low temperature superheater connection flue between two vertical flues of boiler tail and be connected flue with denitration entrance, low temperature superheater connects flue and is all provided with damper with the two ends that denitration entrance is connected flue.
Low temperature superheater is connected between flue and denitration entrance connection flue and is communicated with by vertical gas pass.
Relative to prior art, the present invention is directly provided with the bypass flue that can be communicated with at two vertical flues of boiler tail, a boiler is when opening heater stage or underrun so wherein, bypass flue can be opened, the part high-temperature flue gas in normal two the vertical flues of boiler tail run is made to enter in the vertical flue of underrun boiler tail, improve the entrance flue gas temperature of denitrification apparatus, make the NOx emission in flue gas up to standard, this Dynamic System is flexible, the operating condition of power plant's Various Complex can be met, can ensure that denitration entrance flue gas temperature meets the demands during to reach at any unit underload or to open stove.
Accompanying drawing explanation
Fig. 1 is present system schematic diagram.
Wherein, 1 is #1 low temperature superheater damper; 2 is #1 denitration gas approach baffle plates; 3 is #2 low temperature superheater dampers; 4 is #2 denitration gas approach baffle plates; 5 is that low temperature superheater connects flue; 6 is that denitration entrance connects flue; 7 is vertical gas passes; 8 is #1 boiler low-temperature superheater entrances; 9 is #2 boiler low-temperature superheater entrances; 10 is #2 Denitration in Boiler device portals; 11 is #1 Denitration in Boiler device portals.
Detailed description of the invention
As shown in Figure 1, native system comprises #1 low temperature superheater damper 1, #1 denitration gas approach baffle plate 2, #2 low temperature superheater damper 3, #2 denitration gas approach baffle plate 4, low temperature superheater connects flue 5, denitration entrance connects flue 6, vertical gas pass 7.Low temperature superheater connects flue 5, denitration entrance connects flue 6 and vertical gas pass 7 forms bypass flue.
The flue gas that the vertical flue of two boiler tails is discharged all enters denitrification apparatus, and the denitration entrance connected between two vertical flues of boiler tail connects the junction of flue 6 near the vertical flue of boiler tail and denitrification apparatus.
Flue gas heat is absorbed because the vertical flue of boiler tail is provided with heating surface, therefore when flue gas is by boiler tail vertical flue, temperature drop can be produced, when boiler is for opening heater stage or underrun, flue-gas temperature in the vertical flue of boiler tail is not very high, and completely by after the vertical flue of boiler tail, the flue-gas temperature entering denitrification apparatus entrance is lower, denitrification apparatus can not put into operation in time, NO in the flue gas after denitration
xdischarge not up to standard.
Operation principle of the present invention is: when the boiler that the vertical flue of one of them boiler tail connects is for opening stove or underrun, damper on bypass flue is opened, the part high-temperature flue gas that the normal boiler run is produced is entered into by bypass flue and opens stove or the vertical flue of underrun boiler tail, raises flue-gas temperature; When only have a boiler and underrun time, open the damper on bypass flue, the bypass flue of the vertical flue of this boiler tail is opened and is not communicated with the vertical flue of another boiler tail, make the partial fume in the vertical flue of this boiler tail enter bypass flue after get back in the vertical flue of this boiler tail.
When #1 boiler normally run #2 boiler open stove or underrun time, open #1 low temperature superheater damper 1, open #2 low temperature superheater damper 3, close #1 denitration gas approach baffle plate 2, close #2 denitration gas approach baffle plate 4, the high-temperature flue gas entered through #1 boiler low-temperature superheater entrance 8 enters #2 boiler low-temperature superheater entrance 9, and denitrification apparatus entrance flue gas temperature improves, open spray ammonia, denitration puts into operation.
When #1 boiler normally run #2 boiler open stove or underrun time, open #1 low temperature superheater damper 1, open #2 denitration gas approach baffle plate 4, close #1 denitration gas approach baffle plate 2, close #2 low temperature superheater damper 3, the high-temperature flue gas entered through #1 boiler low-temperature superheater entrance 8 enters #2 Denitration in Boiler device portal 10, and denitrification apparatus entrance flue gas temperature improves, open spray ammonia, denitration puts into operation.
When #2 boiler normally run #1 boiler open stove or underrun time, open #2 low temperature superheater damper 3, open #1 low temperature superheater damper 1, close #1 denitration gas approach baffle plate 2, close #2 denitration gas approach baffle plate 4, the high-temperature flue gas entered through #2 boiler low-temperature superheater entrance 9 enters #1 boiler low-temperature superheater entrance 8, and denitrification apparatus entrance flue gas temperature improves, open spray ammonia, denitration puts into operation.
When #2 boiler normally run #1 boiler open stove or underrun time, open #2 low temperature superheater damper 3, open #1 denitration gas approach baffle plate 2, close #1 low temperature superheater damper 1, close #2 denitration gas approach baffle plate 4, #2 boiler low-temperature superheater entrance 9 high-temperature flue gas and enter #1 Denitration in Boiler device portal 11, denitrification apparatus entrance flue gas temperature improves, open spray ammonia, denitration puts into operation.
When #1 boiler at low load runs, open #1 low temperature superheater damper 1, open #1 denitration gas approach baffle plate 2, close #2 low temperature superheater damper 3, close #2 denitration gas approach baffle plate 4, #1 boiler low-temperature superheater entrance 8 high-temperature flue gas and enter #1 Denitration in Boiler device portal 11, denitrification apparatus entrance flue gas temperature improves, open spray ammonia, denitration puts into operation.
when #2 boiler at low load runs, open #2 low temperature superheater damper 3, open #2 denitration gas approach baffle plate 4, close #1 low temperature superheater damper 1, close #1 denitration gas approach baffle plate 2, #2 boiler low-temperature superheater entrance 9 high-temperature flue gas and enter #2 Denitration in Boiler device portal 10, denitrification apparatus entrance flue gas temperature improves, open spray ammonia, denitration puts into operation.
Claims (3)
1. underload improves a system for denitration cigarette temperature, it is characterized in that: comprise two vertical flues of boiler tail, two vertical flues of boiler tail are all provided with bypass flue, and two bypass flues are communicated with, and bypass flue is provided with damper.
2. a kind of underload according to claim 1 improves the system of denitration cigarette temperature, it is characterized in that: be connected with low temperature superheater connection flue between two vertical flues of boiler tail and be connected flue with denitration entrance, low temperature superheater connects flue and is all provided with damper with the two ends that denitration entrance is connected flue.
3. a kind of underload according to claim 2 improves the system of denitration cigarette temperature, it is characterized in that: low temperature superheater is connected between flue and denitration entrance connection flue and is communicated with by vertical gas pass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510945667.3A CN105423322B (en) | 2015-12-17 | 2015-12-17 | The system that a kind of underload improves denitration cigarette temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510945667.3A CN105423322B (en) | 2015-12-17 | 2015-12-17 | The system that a kind of underload improves denitration cigarette temperature |
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| CN105423322A true CN105423322A (en) | 2016-03-23 |
| CN105423322B CN105423322B (en) | 2017-10-20 |
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| CN201510945667.3A Active CN105423322B (en) | 2015-12-17 | 2015-12-17 | The system that a kind of underload improves denitration cigarette temperature |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106823792A (en) * | 2017-03-31 | 2017-06-13 | 华能国际电力股份有限公司玉环电厂 | Full load SCR flue gas denitrification systems |
| CN107638803A (en) * | 2017-09-22 | 2018-01-30 | 华电电力科学研究院 | A kind of system and its operation method of twin furnace synthetic operation full load denitration |
| CN108826333A (en) * | 2018-06-06 | 2018-11-16 | 华电电力科学研究院有限公司 | A kind of neighbour's furnace intersects the system and its operation method of the wide load denitration of carbonated drink realization |
| CN110252139A (en) * | 2019-07-17 | 2019-09-20 | 神华（福建）能源有限责任公司 | A kind of SCR denitration system, heating device and denitration method |
| CN111140863A (en) * | 2020-03-11 | 2020-05-12 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | A flue gas passage system that satisfies low-load denitrification of adjacent furnaces and mutual backup of flues |
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| DE3637861A1 (en) * | 1986-11-06 | 1988-05-19 | Lentjes Ag | Apparatus for the catalytic denitration of flue gases |
| CN102393005A (en) * | 2011-11-05 | 2012-03-28 | 宁夏科行环保工程有限公司 | Flue gas denitrification and exhaust-heat boiler integrated device |
| 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 |
| CN203316011U (en) * | 2013-07-16 | 2013-12-04 | 中国电力工程顾问集团华北电力设计院工程有限公司 | Structure for improving coal-fired boiler tail smoke denitration input rate |
| CN203375462U (en) * | 2013-05-14 | 2014-01-01 | 河北省电力勘测设计研究院 | Power plant denitration system with folding type SCR denitration device |
| CN203916465U (en) * | 2014-06-17 | 2014-11-05 | 宁波连通设备制造有限公司 | A kind of equipment for denitrifying flue gas |
| CN204026623U (en) * | 2014-08-14 | 2014-12-17 | 河北玖翔节能技术有限公司 | The glass kiln power generation boiler by waste with denitrating system interface |
| CN205481068U (en) * | 2015-12-17 | 2016-08-17 | 华电郑州机械设计研究院有限公司 | System for low -load improves denitration gas temperature |
-
2015
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE3637861A1 (en) * | 1986-11-06 | 1988-05-19 | Lentjes Ag | Apparatus for the catalytic denitration of flue gases |
| CN102393005A (en) * | 2011-11-05 | 2012-03-28 | 宁夏科行环保工程有限公司 | Flue gas denitrification and exhaust-heat boiler integrated device |
| 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 |
| CN203375462U (en) * | 2013-05-14 | 2014-01-01 | 河北省电力勘测设计研究院 | Power plant denitration system with folding type SCR denitration device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106823792A (en) * | 2017-03-31 | 2017-06-13 | 华能国际电力股份有限公司玉环电厂 | Full load SCR flue gas denitrification systems |
| CN106823792B (en) * | 2017-03-31 | 2023-09-26 | 华能国际电力股份有限公司玉环电厂 | Full-load SCR flue gas denitration system |
| CN107638803A (en) * | 2017-09-22 | 2018-01-30 | 华电电力科学研究院 | A kind of system and its operation method of twin furnace synthetic operation full load denitration |
| CN108826333A (en) * | 2018-06-06 | 2018-11-16 | 华电电力科学研究院有限公司 | A kind of neighbour's furnace intersects the system and its operation method of the wide load denitration of carbonated drink realization |
| CN108826333B (en) * | 2018-06-06 | 2023-06-23 | 华电电力科学研究院有限公司 | System for realizing wide-load denitration by adjacent furnace cross steam-water and operation method thereof |
| CN110252139A (en) * | 2019-07-17 | 2019-09-20 | 神华（福建）能源有限责任公司 | A kind of SCR denitration system, heating device and denitration method |
| CN111140863A (en) * | 2020-03-11 | 2020-05-12 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | A flue gas passage system that satisfies low-load denitrification of adjacent furnaces and mutual backup of flues |
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| Publication number | Publication date |
|---|---|
| CN105423322B (en) | 2017-10-20 |
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