CN103822220B - With the electric precipitator flue-dust retainer hot blast heating system that SCR shares - Google Patents
With the electric precipitator flue-dust retainer hot blast heating system that SCR shares Download PDFInfo
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- CN103822220B CN103822220B CN201410065762.XA CN201410065762A CN103822220B CN 103822220 B CN103822220 B CN 103822220B CN 201410065762 A CN201410065762 A CN 201410065762A CN 103822220 B CN103822220 B CN 103822220B
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Abstract
The electric precipitator flue-dust retainer hot blast heating system that the present invention shares with SCR comprises and is connected hot air passage, controllable register, import distributes header, flue-dust retainer hot blast heats interlayer, outlet header, hot blast/ammonia mixing tank, frequency conversion ammonia volume pump; The heating system of a kind of electric precipitator flue-dust retainer use taking hot blast as working medium is provided, significantly saves power supply for station; The tail gas that its temperature discharged is still high is used as the diluent air of SCR denitration system, is enough to provide the heat required for liquefied ammonia evaporation; With frequency conversion volume pump can flexible SCR need ammonia spraying amount; Ammonia-the air mixture of 5% safe concentration of comparatively high temps is obvious with main smoke airflow mixing energy-saving effect compared with ammonia evaporator tank, ammonia dashpot, cold diluent air blower fan scheme through ammonia-spraying grid, and initial cost is more economized; Exerting oneself of frequency conversion ammonia volume pump controls by unit DCS, improves ammonia spraying amount controllability, reduces time lag, more effectively controls the residue ammonia amount of SCR outlet.
Description
(1) technical field:
The electric precipitator flue-dust retainer hot blast heating system that the present invention and SCR share relates to the heating system that a kind of coal power station electric precipitator flue-dust retainer uses, and its tail gas discharged is used as the diluent air of SCR, and the heat that tail gas carries provides the heat required for liquefied ammonia evaporation.
(2) background technology:
Prior art coal power station electric precipitator flue-dust retainer is prevent the stifled ash of solidifying dew from adopting electricity heating system/steam heating system to maintain the mobility of flyash, especially to low temperature electric precipitator, the more too busy to get away flue-dust retainer heating system of low temperature electric precipitator. The power consumption of a 1000MW unit electric precipitator flue-dust retainer electricity heating system reaches 720kW; The steam that steam heating system consumes is few electricity power also more than 720kW in Steam Turbine, owing to hydrophobic iron-holder is high-leveled and difficult to reclaim, causes again the loss of working medium and heat.
SCR (SelectiveCatalyticReduction) gas denitrifying technology is the most widely used gas denitrifying technology of prior art, and the most frequently used reductive agent is liquefied ammonia. Prior art ammonia evaporator tank, ammonia dashpot, diluent air blower fan prepare the ammonia-air mixture of 5% safe concentration for ammonia-spraying grid. 1000MW unit diluent air blower fan, an ammonia evaporator tank are about power consumption 200kW.
Liquefied ammonia, is also called anhydrous ammonia, is a kind of colourless liquid, and very easily gasification is gas ammonia, has intense stimulus smell. Fusing point-77.7 DEG C; Boiling point-33.42 DEG C; Liquefied ammonia relative density (water=1) 0.602824 (25 DEG C); Gas ammonia relative density (air=1) 0.59; Limits of explosion: 16%��25%.
(3) summary of the invention:
Technical problem to be solved:
Electricity heating system experience heat-electricity-Re twice conversion process of energy, wherein heat-photoelectric transformation efficiency only has 40%, the obvious poor efficiency of whole process; Although each electric precipitator flue-dust retainer has been configured with 10kW electrical heating element, but very large electric precipitator flue-dust retainer is difficult to all maintain at each position the good mobility of flyash, especially in season in midwinter.
Simplify SCR flue gas denitrification system, reduce investment, reduce energy consumption, improve ammonia spraying amount controllability, improve the time lag characteristic that ammonia spraying amount regulates.
Solve the technical scheme that its technical problem adopts:
The electric precipitator flue-dust retainer hot blast heating system that the present invention shares from SCR takes the technological line completely different with prior art, there is provided a kind of can hot blast be working medium electric precipitator flue-dust retainer use heating system, the tail gas that its temperature discharged is still high is used as the diluent air of SCR, is enough to provide the heat required for liquefied ammonia evaporation; With frequency conversion volume pump can flexible SCR need ammonia spraying amount.
The electric precipitator flue-dust retainer hot blast heating system that the present invention shares with SCR comprises and is connected hot air passage (2), controllable register (3), import distributes header (4), flue-dust retainer hot blast heats interlayer (5), outlet header (6), hot blast/ammonia mixing tank (7), frequency conversion ammonia volume pump (9); Connect the diluent air that hot air passage (2) obtains SCR flue gas denitrification system needs from the big bellows of heat primary air (1), regulate the hot blast amount obtained with controllable register (3); Flue-dust retainer hot blast is heated interlayer (5) One's name is legion, and after adopting first series connection, mode in parallel is unified into array, and array import distributes header (4) through import and is connected with controllable register (3); Array outlets is connected with hot blast/ammonia mixing tank (7) through outlet header (6); Frequency conversion ammonia volume pump (9) aspirates liquefied ammonia from anhydrous ammonia tank (10), sprays into hot blast/ammonia mixing tank (7); The ammonia air mixture of 5% safe concentration that hot blast/ammonia mixing tank (7) exports connects hot air passage (11) through stainless steel and enters ammonia-spraying grid (8); Exerting oneself of frequency conversion ammonia volume pump (9) controls by unit DCS.
The beneficial effect of the invention:
�� significantly saves power supply for station compared with electric precipitator flue-dust retainer electricity heating system;
�� is significantly energy-conservation and without the loss of working medium and heat compared with electric precipitator flue-dust retainer steam heating system;
�� hot blast heating system is higher to the thermal power of effectively heating of electric precipitator flue-dust retainer;
�� obtains hot blast from the big bellows of heat primary air (1), increases the wind/cigarette ratio of rotary regenerative air preheater, it is possible to utilize fume afterheat from flue gas more;
Ammonia-the air mixture of 5% safe concentration of �� comparatively high temps is obvious with main smoke airflow mixing energy-saving effect compared with ammonia evaporator tank, ammonia dashpot, cold diluent air blower fan scheme through ammonia-spraying grid, and initial cost is more economized;
�� frequency conversion ammonia volume pump (9) exerts oneself by unit DCS (dispersing control system) control, improves ammonia spraying amount controllability, improves the time lag characteristic that ammonia spraying amount regulates, more effectively controls the residue ammonia amount of SCR outlet.
(4) accompanying drawing illustrates:
Fig. 1 is the electric precipitator flue-dust retainer hot blast heating system shared with SCR.
In FIG:
The 1 big bellows of heat primary air, 2 connection hot air passages,
3 controllable registers, 4 import distribution headers,
5 flue-dust retainer hot blasts heat interlayer, 6 outlet headers,
7 hot blasts/ammonia mixing tank, 8 ammonia-spraying grids,
9 frequency conversion ammonia volume pumps, 10 anhydrous ammonia tanks,
11 stainless steels connect hot air passage.
(5) embodiment:
Embodiment 1:
Existing composition graphs 1 illustrates, for the electric precipitator flue-dust retainer hot blast heating system shared with SCR, the optimal way realizing invention.
The electric precipitator flue-dust retainer hot blast heating system that the present invention and SCR share comprises and is connected hot air passage (2), controllable register (3), import distribution header (4), flue-dust retainer hot blast heat interlayer (5), outlet header (6), hot blast/ammonia mixing tank (7), ammonia-spraying grid (8), frequency conversion ammonia volume pump (9), stainless steel connection hot air passage (11); Connect the diluent air amount that hot air passage (2) obtains SCR flue gas denitrification system needs from the big bellows of heat primary air (1), by the hot blast amount of controllable register (3) adjustable acquisition; Flue-dust retainer hot blast is heated interlayer (5) One's name is legion, and after adopting first series connection, mode in parallel is unified into array, and array import distributes header (4) through import and is connected with controllable register (3); Array outlets is connected with hot blast/ammonia mixing tank (7) through outlet header (6); Frequency conversion ammonia volume pump (9) aspirates liquefied ammonia from anhydrous ammonia tank (10), sprays into hot blast/ammonia mixing tank (7); Ammonia-the air mixture of 5% safe concentration that hot blast/ammonia mixing tank (7) exports connects hot air passage (11) through stainless steel and enters ammonia-spraying grid (8); Exerting oneself of frequency conversion ammonia volume pump (9) controls by unit DCS.
The heat through-flow section of hot blast runner of interlayer (5) of flue-dust retainer hot blast is rectangle, is coiled in a spiral form outside flue-dust retainer; Interlayer (5) series connection of heating of the flue-dust retainer hot blast of same runner not same electric field is one group; The many groups of formation flue-dust retainer hot blasts parallel with one another that different runner is formed are heated the array of interlayer (5).
Connecting hot air passage (2) to make by carbon steel, be furnished with the waveform compensation joint that stainless steel makes, there is thermal insulation layer in outside.
Stainless steel connects hot air passage (11) and makes by stainless steel, is furnished with the waveform compensation joint that stainless steel makes, and there is thermal insulation layer in outside; The connection hot air passage of all contact ammonia all makes of stainless steel.
Controllable register (3) is electronic, controls by unit DCS.
Hot blast/ammonia mixing tank (7) is made by stainless steel, and main flow road is that shape is put in contracting.
Frequency conversion ammonia volume pump (9) is the ram pump that variable-frequency power sources drives, it is provided that necessary pressure atomization liquefied ammonia, controls by unit DCS.
Import distribution header (4), outlet header (6) are made by carbon steel, enough sections should be had to make the axial pressure difference of header quite be less than flue-dust retainer hot blast and heat the pressure reduction of spiral flow channel of interlayer (5), and there is thermal insulation layer in outside.
Ammonia-spraying grid (8) is a part for SCR denitrating flue gas host system, is arranged in main flue gas runner.
Claims (8)
1. the electric precipitator flue-dust retainer hot blast heating system shared with SCR, it is characterised in that: comprise and connect hot air passage (2), controllable register (3), import distributes header (4), flue-dust retainer hot blast heats interlayer (5), outlet header (6), hot blast/ammonia mixing tank (7), frequency conversion ammonia volume pump (9); Connect the diluent air that hot air passage (2) obtains SCR flue gas denitrification system needs from the big bellows of heat primary air (1), regulate the hot blast amount obtained with controllable register (3); Flue-dust retainer hot blast is heated interlayer (5) One's name is legion, and after adopting first series connection, mode in parallel is unified into array, and array import distributes header (4) through import and is connected with controllable register (3); Array outlets is connected with hot blast/ammonia mixing tank (7) through outlet header (6); Frequency conversion ammonia volume pump (9) aspirates liquefied ammonia from anhydrous ammonia tank (10), sprays into hot blast/ammonia mixing tank (7); Ammonia-the air mixture of 5% safe concentration that hot blast/ammonia mixing tank (7) exports connects hot air passage (11) through stainless steel and enters ammonia-spraying grid (8); Exerting oneself of frequency conversion ammonia volume pump (9) controls by unit DCS.
2. the electric precipitator flue-dust retainer hot blast heating system shared with SCR according to claim 1, is characterized in that the heat through-flow section of hot blast runner of interlayer (5) of described flue-dust retainer hot blast is rectangle, is coiled in a spiral form outside flue-dust retainer; Interlayer (5) series connection of heating of the flue-dust retainer hot blast of same runner not same electric field is one group; The many groups of formation flue-dust retainer hot blasts parallel with one another that different runner is formed are heated the array of interlayer (5).
3. the electric precipitator flue-dust retainer hot blast heating system shared with SCR according to claim 1, is characterized in that described connection hot air passage (2) is made by carbon steel, is furnished with the waveform compensation joint that stainless steel makes, and there is thermal insulation layer in outside.
4. the electric precipitator flue-dust retainer hot blast heating system shared with SCR according to claim 1, is characterized in that described stainless steel connects hot air passage (11) and makes by stainless steel, is furnished with the waveform compensation joint that stainless steel makes, there is thermal insulation layer in outside; The connection hot air passage of all contact ammonia all makes of stainless steel.
5. the electric precipitator flue-dust retainer hot blast heating system shared with SCR according to claim 1, is characterized in that described controllable register (3) is electronic, controls by unit DCS.
6. the electric precipitator flue-dust retainer hot blast heating system shared with SCR according to claim 1, is characterized in that described hot blast/ammonia mixing tank (7) is made by stainless steel, and main flow road is that shape is put in contracting.
7. the electric precipitator flue-dust retainer hot blast heating system shared with SCR according to claim 1, is characterized in that described frequency conversion ammonia volume pump (9) is the ram pump that variable-frequency power sources drives, it is provided that necessary pressure atomization liquefied ammonia, controls by unit DCS.
8. the electric precipitator flue-dust retainer hot blast heating system shared with SCR according to claim 1, it is characterized in that described import distribution header (4), outlet header (6) are made by carbon steel, enough sections should being had to make the axial pressure difference of header quite be less than flue-dust retainer hot blast heat the pressure reduction of spiral flow channel of interlayer (5), there is thermal insulation layer in outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410065762.XA CN103822220B (en) | 2014-02-26 | 2014-02-26 | With the electric precipitator flue-dust retainer hot blast heating system that SCR shares |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410065762.XA CN103822220B (en) | 2014-02-26 | 2014-02-26 | With the electric precipitator flue-dust retainer hot blast heating system that SCR shares |
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| CN103822220A CN103822220A (en) | 2014-05-28 |
| CN103822220B true CN103822220B (en) | 2016-06-01 |
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| CN201410065762.XA Active CN103822220B (en) | 2014-02-26 | 2014-02-26 | With the electric precipitator flue-dust retainer hot blast heating system that SCR shares |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105126999A (en) * | 2015-08-31 | 2015-12-09 | 浙江菲达环保科技股份有限公司 | Low-low temperature electric dust remover |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2508857Y (en) * | 2001-11-06 | 2002-09-04 | 黑龙江省庆安三松实业有限公司 | Anti-explosive dewfall-proof high-voltage electrostatic dust separator |
| US7588440B2 (en) * | 2005-04-13 | 2009-09-15 | Babcock & Wilcox Power Generation Group, Inc. | Carrier air heating system for SCR |
| CN201427766Y (en) * | 2009-04-13 | 2010-03-24 | 涂建华 | Thermal-conductive steam-heating ash hopper of dust remover |
| CN203002215U (en) * | 2012-12-27 | 2013-06-19 | 浙江信耳科技有限公司 | SCR (Selective Catalytic Reduction) flue gas denitration system for burning lignite |
| CN103480272A (en) * | 2013-10-01 | 2014-01-01 | 王脯胜 | Dust-removing, denitration and desulfurization process and device for flue gas of glass kiln |
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