CN101829499A - SCR (Selective Catalytic Reduction) flue gas denitrification system with structure of optimized ammonia spraying device upstream fluid field - Google Patents
SCR (Selective Catalytic Reduction) flue gas denitrification system with structure of optimized ammonia spraying device upstream fluid field Download PDFInfo
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- CN101829499A CN101829499A CN 201010176144 CN201010176144A CN101829499A CN 101829499 A CN101829499 A CN 101829499A CN 201010176144 CN201010176144 CN 201010176144 CN 201010176144 A CN201010176144 A CN 201010176144A CN 101829499 A CN101829499 A CN 101829499A
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Abstract
The invention discloses a SCR (Selective Catalytic Reduction) flue gas denitrification system with a structure of an optimized ammonia spraying device upstream fluid field. The ammonia spraying device, which is arranged in a flue in the SCR flue gas denitrification system, is provided with a porous medium, which is fully distributed on flue gas flow sections; and the resistance generated by the glue gas through the porous medium is less than 450Pa. The flue gas fluid field is optimized by the rectification and guide functions of the porous medium. The device of the invention has the following advantages of: (1) having simple structure, convenient manufacture and installation; (2) effectively optimizing the fluid field, and reducing the ammonia spraying adjustment difficulty; (3) greatly reducing the design difficulties of the flue of the downstream of the ammonia spraying device in the SCR flue gas denitrification system and the inner components, the reactor, and the rectification and guide device; and (4) greatly improving the denitrification efficiency of the SCR flue gas denitrification system, and decreasing the ammonia escape.
Description
Technical field
The present invention relates to the energy environment protection technology, relate in particular to a kind of SCR flue gas denitrification system of optimizing the ammonia spraying device upstream structure of flow field that has.
Background technology
Nitrogen oxide is one of generally acknowledged atmosphere pollution in countries in the world.SCR (SCR) gas denitrifying technology that with ammonia is reducing agent is to remove in the flue gas the otherwise effective technique of nitrogen oxide at present, has at home and abroad obtained using widely.Its cardinal principle is under the effect of catalyst, and the reaction of nitrogen oxides in reducing agent ammonia and the flue gas is reduced into living nitrogen G﹠W, thereby reaches the purpose of removal of nitrogen oxide.The degree of mixing of nitrogen oxide is one of key factor that influences denitration efficiency in reducing agent ammonia and the flue gas.In the SCR denitrating system, reducing agent ammonia sprays into flue by ammonia-gas spraying device to be mixed with flue gas, nitrogen oxide evenly mixes in reducing agent ammonia and the flue gas in order better to make, ammonia-gas spraying device generally adopts the multi-point injection subregion to regulate, because flue gas flow field skewness in the ammonia spraying device upstream flue, thereby cause the distribution of nitrogen oxide in the flue gas also very inhomogeneous, make that the adjusting difficulty of ammonia-gas spraying device in actual motion is quite big.The inventor is based upon on the basis of being engaged in flue gas desulfurization and denitrification research for a long time, adopt a kind of apparatus and method, realized the optimization in SCR flue gas denitrification system ammonia spraying device upstream flow field, this device simple in structure, make easy for installation, energy effective optimization flow field, reduce spray ammonia and regulate difficulty, and make the flue in SCR flue gas denitrification system ammonia-gas spraying device downstream and inner part, reactor and rectification and guide Design of device difficulty thereof reduce greatly, can increase substantially the denitration efficiency of SCR denitrating system, reduce the escaping of ammonia.
Summary of the invention:
The objective of the invention is to overcome the deficiencies in the prior art, a kind of SCR flue gas denitrification system of optimizing the ammonia spraying device upstream structure of flow field that has is provided.
A kind of SCR flue gas denitrification system of optimizing the ammonia spraying device upstream structure of flow field that has comprises boiler, economizer, flue, porous media, ammonia-gas spraying device, SCR Benitration reactor, air preheater, pressure fan, ammonia/air mixer, ammonia preparation facilities, dilution blower fan, deduster, desulfurizer, air-introduced machine chimney; Boiler is connected successively with economizer, flue, SCR Benitration reactor, air preheater, deduster, desulfurizer, air-introduced machine, chimney, pressure fan is connected successively with air preheater, boiler, be provided with ammonia-gas spraying device in the flue, the ammonia preparation facilities links to each other with ammonia/air mixer, ammonia-gas spraying device successively with the dilution blower fan, ammonia spraying device upstream in flue is provided with porous media, and being covered with the flue gas flow area, the resistance that flue gas produces by porous media is less than 450Pa.
Another kind has the SCR flue gas denitrification system of optimizing the ammonia spraying device upstream structure of flow field and comprises boiler, economizer, flue, porous media, ammonia-gas spraying device, SCR Benitration reactor, air preheater, pressure fan, ammonia/air mixer, ammonia preparation facilities, dilution blower fan, deduster, desulfurizer, air-introduced machine chimney; Boiler is connected successively with economizer, deduster, flue, SCR Benitration reactor, air preheater, desulfurizer, air-introduced machine, chimney, pressure fan is connected successively with air preheater, boiler, be provided with ammonia-gas spraying device in the flue, the ammonia preparation facilities links to each other with ammonia/air mixer, ammonia-gas spraying device successively with the dilution blower fan, ammonia spraying device upstream in flue is provided with porous media, and being covered with the flue gas flow area, the resistance that flue gas produces by porous media is less than 450Pa.
Another kind has the SCR flue gas denitrification system of optimizing the ammonia spraying device upstream structure of flow field and comprises boiler, economizer, flue, porous media, ammonia-gas spraying device, SCR Benitration reactor, air preheater, pressure fan, ammonia/air mixer, ammonia preparation facilities, dilution blower fan, deduster, desulfurizer, air-introduced machine chimney, gas-to-gas heat exchanger, heater; Boiler is connected with economizer, air preheater, deduster, desulfurizer, gas-to-gas heat exchanger, heater, flue, SCR Benitration reactor, gas-to-gas heat exchanger, air-introduced machine, chimney, pressure fan is connected successively with air preheater, boiler, be provided with ammonia-gas spraying device in the flue, the ammonia preparation facilities links to each other with ammonia/air mixer, ammonia-gas spraying device successively with the dilution blower fan, ammonia spraying device upstream in flue is provided with porous media, and being covered with the flue gas flow area, the resistance that flue gas produces by porous media is less than 450Pa.
Described porous media is metal material, nonmetallic materials or composite.Described metal material is ferrous metal, non-ferrous metal and special metal material.Described nonmetallic materials are pottery, rubber, fiber, glass.Described composite is metal and metallic composite, nonmetal and metallic composite, nonmetal and nonmetallic composite.
The beneficial effect that the present invention compared with prior art has:
1) simple in structure, make easy for installation;
2) effective optimization the flow field, reduced spray ammonia and regulated difficulty;
3) greatly reduce flue and inner part, reactor and the rectification and guide Design of device difficulty thereof in SCR flue gas denitrification system ammonia-gas spraying device downstream;
4) increase substantially the denitration efficiency of SCR denitrating system, reduced the escaping of ammonia.
Description of drawings
Fig. 1 is the SCR flue gas denitrification system structural representation that has optimization ammonia spraying device upstream structure of flow field that high dirt is arranged;
Fig. 2 is the SCR flue gas denitrification system structural representation that has optimization ammonia spraying device upstream structure of flow field that low dirt is arranged;
Fig. 3 is the SCR flue gas denitrification system structural representation that has optimization ammonia spraying device upstream structure of flow field that tail end is arranged;
Fig. 4 is the vertical view of optimization ammonia spraying device upstream structure of flow field of the present invention;
Fig. 5 is the ammonia spraying device upstream velocity of flue gas cloud charts in the SCR flue gas denitrification system of optimizing the ammonia spraying device upstream structure of flow field that has of high dirt layout;
Fig. 6 is the ammonia spraying device upstream velocity of flue gas cloud charts in the SCR flue gas denitrification system of optimizing the ammonia spraying device upstream structure of flow field that has of low dirt layout;
Fig. 7 is the ammonia spraying device upstream velocity of flue gas cloud charts in the SCR flue gas denitrification system of optimizing the ammonia spraying device upstream structure of flow field that has of tail end layout;
Among the figure: boiler 1, economizer 2, flue 3, porous media 4, ammonia-gas spraying device 5, SCR Benitration reactor 6, air preheater 7, pressure fan 8, ammonia/air mixer 9, ammonia preparation facilities 10, dilution blower fan 11, deduster 12, desulfurizer 13, air-introduced machine 14, chimney 15, gas-to-gas heat exchanger 16, heater 17.
The specific embodiment
As shown in Figure 1, have the SCR flue gas denitrification system of optimizing the ammonia spraying device upstream structure of flow field and comprise boiler 1, economizer 2, flue 3, porous media 4, ammonia-gas spraying device 5, SCR Benitration reactor 6, air preheater 7, pressure fan 8, ammonia/air mixer 9, ammonia preparation facilities 10, dilution blower fan 11, deduster 12, desulfurizer 13, air-introduced machine 14 chimneys 15; Boiler 1 and economizer 2, flue 3, SCR Benitration reactor 6, air preheater 7, deduster 12, desulfurizer 13, air-introduced machine 14, chimney 15 is connected successively, pressure fan 8 and air preheater 7, boiler 1 is connected successively, be provided with ammonia-gas spraying device 5 in the flue 3, ammonia preparation facilities 10 and dilution blower fan 11 and ammonia/air mixer 9, ammonia-gas spraying device 5 links to each other successively, ammonia-gas spraying device 5 upstreams in flue 3 are provided with porous media 4, and be covered with the flue gas flow area, porous media 4 is processed by the thick ferrous metal carbon steel material of 6mm, its perforate is uniform circular hole, the aperture is 50mm, the percent opening of porous media 4 is 51%, flue gas is 150Pa by the resistance that porous media 4 produces, the flue gas flow field of ammonia-gas spraying device 5 upstreams is optimized through the rectification refluence effect of porous media, reaches even distribution.
As shown in Figure 2, have the SCR flue gas denitrification system of optimizing the ammonia spraying device upstream structure of flow field and comprise boiler 1, economizer 2, flue 3, porous media 4, ammonia-gas spraying device 5, SCR Benitration reactor 6, air preheater 7, pressure fan 8, ammonia/air mixer 9, ammonia preparation facilities 10, dilution blower fan 11, deduster 12, desulfurizer 13, air-introduced machine 14 chimneys 15; Boiler 1 and economizer 2, deduster 12, flue 3, SCR Benitration reactor 6, air preheater 7, desulfurizer 13, air-introduced machine 14, chimney 15 is connected successively, pressure fan 8 and air preheater 7, boiler 1 is connected successively, be provided with ammonia-gas spraying device 5 in the flue 3, ammonia preparation facilities 10 and dilution blower fan 11 and ammonia/air mixer 9, ammonia-gas spraying device 5 links to each other successively, ammonia-gas spraying device 5 upstreams in flue 3 are provided with porous media 4, and be covered with the flue gas flow area, porous media 4 is processed by the thick ceramic material of 100mm, its perforate is uniform square hole, the aperture is 13mm, the percent opening of porous media 4 is 65%, flue gas is 120Pa by the resistance that porous media 4 produces, the flue gas flow field of ammonia-gas spraying device 5 upstreams is optimized through the rectification refluence effect of porous media, reaches even distribution.
As shown in Figure 3, have the SCR flue gas denitrification system of optimizing the ammonia spraying device upstream structure of flow field and comprise boiler 1, economizer 2, flue 3, porous media 4, ammonia-gas spraying device 5, SCR Benitration reactor 6, air preheater 7, pressure fan 8, ammonia/air mixer 9, ammonia preparation facilities 10, dilution blower fan 11, deduster 12, desulfurizer 13, air-introduced machine 14 chimneys 15, gas-to-gas heat exchanger 16, heater 17; Boiler 1 and economizer 2, air preheater 7, deduster 12, desulfurizer 13, gas-to-gas heat exchanger 16, heater 17, flue 3, SCR Benitration reactor 6, gas-to-gas heat exchanger 16, air-introduced machine 14, chimney 15 is connected, pressure fan 8 and air preheater 7, boiler 1 is connected successively, be provided with ammonia-gas spraying device 5 in the flue 3, ammonia preparation facilities 10 and dilution blower fan 11 and ammonia/air mixer 9, ammonia-gas spraying device 5 links to each other successively, ammonia-gas spraying device 5 upstreams in flue 3 are provided with porous media 4, and be covered with the flue gas flow area, porous media 4 is processed by 20mm thick rubber and fibrous composite, its perforate is uniform circular hole, the aperture is 20mm, the percent opening of porous media 4 is 45%, flue gas passes through the resistance of porous media 4 generations less than 200Pa, the flue gas flow field of ammonia-gas spraying device 5 upstreams is optimized through the rectification refluence effect of porous media, reaches even distribution.
As shown in Figure 5, the velocity of flue gas that has ammonia-gas spraying device 5 upstreams in the SCR flue gas denitrification system of optimizing the ammonia spraying device upstream structure of flow field of using high dirt layout distributes very evenly, thereby make the adjusting difficulty of ammonia-gas spraying device 5 in actual motion reduce greatly, can produce a desired effect fully.
As shown in Figure 6, the velocity of flue gas that has ammonia-gas spraying device 5 upstreams in the SCR flue gas denitrification system of optimizing the ammonia spraying device upstream structure of flow field of using low dirt layout distributes very evenly, thereby make the adjusting difficulty of ammonia-gas spraying device 5 in actual motion reduce greatly, can produce a desired effect fully.
As shown in Figure 7, the velocity of flue gas that has ammonia-gas spraying device 5 upstreams in the SCR flue gas denitrification system of optimizing the ammonia spraying device upstream structure of flow field of using the tail end layout distributes very evenly, thereby make the adjusting difficulty of ammonia-gas spraying device 5 in actual motion reduce greatly, can produce a desired effect fully.
Claims (7)
1. one kind has the SCR flue gas denitrification system of optimizing the ammonia spraying device upstream structure of flow field, comprises boiler (1), economizer (2), flue (3), porous media (4), ammonia-gas spraying device (5), SCR Benitration reactor (6), air preheater (7), pressure fan (8), ammonia/air mixer (9), ammonia preparation facilities (10), dilution blower fan (11), deduster (12), desulfurizer (13), air-introduced machine (14) chimney (15); Boiler (1) and economizer (2), flue (3), SCR Benitration reactor (6), air preheater (7), deduster (12), desulfurizer (13), air-introduced machine (14), chimney (15) is connected successively, pressure fan (8) and air preheater (7), boiler (1) is connected successively, be provided with ammonia-gas spraying device (5) in the flue (3), ammonia preparation facilities (10) and dilution blower fan (11) and ammonia/air mixer (9), ammonia-gas spraying device (5) links to each other successively, it is characterized in that ammonia-gas spraying device (5) upstream in flue (3) is provided with porous media (4), and being covered with the flue gas flow area, flue gas passes through the resistance of porous media (4) generation less than 450Pa.
2. one kind has the SCR flue gas denitrification system of optimizing the ammonia spraying device upstream structure of flow field, comprises boiler (1), economizer (2), flue (3), porous media (4), ammonia-gas spraying device (5), SCR Benitration reactor (6), air preheater (7), pressure fan (8), ammonia/air mixer (9), ammonia preparation facilities (10), dilution blower fan (11), deduster (12), desulfurizer (13), air-introduced machine (14) chimney (15); Boiler (1) and economizer (2), deduster (12), flue (3), SCR Benitration reactor (6), air preheater (7), desulfurizer (13), air-introduced machine (14), chimney (15) is connected successively, pressure fan (8) and air preheater (7), boiler (1) is connected successively, be provided with ammonia-gas spraying device (5) in the flue (3), ammonia preparation facilities (10) and dilution blower fan (11) and ammonia/air mixer (9), ammonia-gas spraying device (5) links to each other successively, it is characterized in that ammonia-gas spraying device (5) upstream in flue (3) is provided with porous media (4), and being covered with the flue gas flow area, flue gas passes through the resistance of porous media (4) generation less than 450Pa.
3. one kind has the SCR flue gas denitrification system of optimizing the ammonia spraying device upstream structure of flow field, comprises boiler (1), economizer (2), flue (3), porous media (4), ammonia-gas spraying device (5), SCR Benitration reactor (6), air preheater (7), pressure fan (8), ammonia/air mixer (9), ammonia preparation facilities (10), dilution blower fan (11), deduster (12), desulfurizer (13), air-introduced machine (14) chimney (15), gas-to-gas heat exchanger (16), heater (17); Boiler (1) and economizer (2), air preheater (7), deduster (12), desulfurizer (13), gas-to-gas heat exchanger (16), heater (17), flue (3), SCR Benitration reactor (6), gas-to-gas heat exchanger (16), air-introduced machine (14), chimney (15) is connected, pressure fan (8) and air preheater (7), boiler (1) is connected successively, be provided with ammonia-gas spraying device (5) in the flue (3), ammonia preparation facilities (10) and dilution blower fan (11) and ammonia/air mixer (9), ammonia-gas spraying device (5) links to each other successively, it is characterized in that ammonia-gas spraying device (5) upstream in flue (3) is provided with porous media (4), and being covered with the flue gas flow area, flue gas passes through the resistance of porous media (4) generation less than 450Pa.
4. according to claim 1,2 or 3 described a kind of SCR flue gas denitrification systems of optimizing the ammonia spraying device upstream structure of flow field that have, it is characterized in that described porous media (4) is metal material, nonmetallic materials or composite.
5. a kind of SCR flue gas denitrification system of optimizing the ammonia spraying device upstream structure of flow field that has according to claim 4 is characterized in that described metal material is ferrous metal, non-ferrous metal and special metal material.
6. a kind of SCR flue gas denitrification system of optimizing the ammonia spraying device upstream structure of flow field that has according to claim 4 is characterized in that described nonmetallic materials are pottery, rubber, fiber, glass.
7. a kind of SCR flue gas denitrification system of optimizing the ammonia spraying device upstream structure of flow field that has according to claim 4 is characterized in that described composite is metal and metallic composite, nonmetal and metallic composite, nonmetal and nonmetallic composite.
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Cited By (11)
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| CN102000504A (en) * | 2010-09-27 | 2011-04-06 | 北京科技大学 | SCR denitration device for flue gas of glass furnace |
| CN102125800A (en) * | 2011-02-22 | 2011-07-20 | 浙江省电力试验研究院 | Method for optimized regulation of SCR (Selective Catalyst Reduction) flue gas denitration system in coal-fired power plant |
| CN102179156A (en) * | 2011-05-06 | 2011-09-14 | 东南大学 | Smoke denitration device for preventing catalyst from being plugged by popcorn ash |
| CN102188904A (en) * | 2011-05-11 | 2011-09-21 | 宝钢工程技术集团有限公司 | Denitration system and method for sintering flue gas without ammonia reducing agent |
| CN102294171A (en) * | 2011-06-30 | 2011-12-28 | 光大环保能源（苏州）有限公司 | Flue gas purifying system |
| CN102512953A (en) * | 2011-12-23 | 2012-06-27 | 东方电气集团东方锅炉股份有限公司 | CFB boiler SCR denitration technology and denitration device |
| CN102767823A (en) * | 2012-08-07 | 2012-11-07 | 上海应用技术学院 | Smokeless combustion system for zinc melting furnace |
| CN103768941A (en) * | 2014-02-19 | 2014-05-07 | 大唐淮南洛河发电厂 | SCR (Selective Catalytic Reduction) smoke denitration equipment and denitration method thereof |
| CN104906952A (en) * | 2015-06-03 | 2015-09-16 | 北京凯盛建材工程有限公司 | SCR denitration system and method |
| CN105268315A (en) * | 2015-10-09 | 2016-01-27 | 浙江浩普环保工程有限公司 | Flue gas pollutant ultra-low emission system |
| CN109289517A (en) * | 2018-09-13 | 2019-02-01 | 大唐东北电力试验研究院有限公司 | Selective catalytic reduction denitration device catalyst anti-wearing method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102000504A (en) * | 2010-09-27 | 2011-04-06 | 北京科技大学 | SCR denitration device for flue gas of glass furnace |
| CN102125800A (en) * | 2011-02-22 | 2011-07-20 | 浙江省电力试验研究院 | Method for optimized regulation of SCR (Selective Catalyst Reduction) flue gas denitration system in coal-fired power plant |
| CN102179156A (en) * | 2011-05-06 | 2011-09-14 | 东南大学 | Smoke denitration device for preventing catalyst from being plugged by popcorn ash |
| CN102188904A (en) * | 2011-05-11 | 2011-09-21 | 宝钢工程技术集团有限公司 | Denitration system and method for sintering flue gas without ammonia reducing agent |
| CN102294171A (en) * | 2011-06-30 | 2011-12-28 | 光大环保能源（苏州）有限公司 | Flue gas purifying system |
| CN102512953A (en) * | 2011-12-23 | 2012-06-27 | 东方电气集团东方锅炉股份有限公司 | CFB boiler SCR denitration technology and denitration device |
| CN102767823A (en) * | 2012-08-07 | 2012-11-07 | 上海应用技术学院 | Smokeless combustion system for zinc melting furnace |
| CN103768941A (en) * | 2014-02-19 | 2014-05-07 | 大唐淮南洛河发电厂 | SCR (Selective Catalytic Reduction) smoke denitration equipment and denitration method thereof |
| CN104906952A (en) * | 2015-06-03 | 2015-09-16 | 北京凯盛建材工程有限公司 | SCR denitration system and method |
| CN105268315A (en) * | 2015-10-09 | 2016-01-27 | 浙江浩普环保工程有限公司 | Flue gas pollutant ultra-low emission system |
| CN109289517A (en) * | 2018-09-13 | 2019-02-01 | 大唐东北电力试验研究院有限公司 | Selective catalytic reduction denitration device catalyst anti-wearing method |
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Application publication date: 20100915 |