CN204891590U - Energy -efficient deNOx systems of domestic waste power plant - Google Patents
Energy -efficient deNOx systems of domestic waste power plant Download PDFInfo
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- CN204891590U CN204891590U CN201520665629.8U CN201520665629U CN204891590U CN 204891590 U CN204891590 U CN 204891590U CN 201520665629 U CN201520665629 U CN 201520665629U CN 204891590 U CN204891590 U CN 204891590U
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Abstract
The utility model provides an energy -efficient deNOx systems of domestic waste power plant, relates to domestic waste deNOx systems's design technical field. The utility model discloses a grate furnace, exhaust -heat boiler, deacidification reaction tower, sack cleaner, hui cang, low temperature SCR reactor, draught fan, chimney, SNCR spray gun, first air compressor machine, softened water tank, SNCR aqueous ammonia buffer tank, first aqueous ammonia delivery pump, aqueous ammonia holding vessel, second aqueous ammonia delivery pump, SCR aqueous ammonia buffer tank, ammonia evaporator, blender, second air compressor machine, the utility model discloses a " SNCR+ low temperature SCR " combination is out of stock, practices thrift investment cost, has saved the heat energy of power plant, has prolonged the life of catalyst, has certain economic nature, satisfy emission standard, have the high efficiency.
Description
Technical field
The utility model relates to the design field of house refuse denitrating system.
Background technology
The newly-built garbage incinerating power plant quantity of China increases year by year, and the ratio shared in domestic rubbish disposal mode of burning method also rises year by year.Municipal solid waste incinerator is the same with coal-fired power plant, can produce a large amount of containing the atmosphere pollution such as particle, HCl, SO2, NOX, bioxin in burning process.At present, house refuse power-plant flue gas processing mode is " semidry method/dry-process deacidification+sack cleaner ", effectively controls flue dust, particle and ease of solubility sour gas.But the NOX in flue gas is not soluble in water, depickling reaction tower cannot effectively be removed.The municipal solid waste incinerator fume emission of domestic built operation all performs " consumer waste incineration Environmental capacity standard " (GB18485-2014), NOX emission limit is 250mg/Nm3, and therefore consumer waste incineration power plant must implement practicable NOX control measure.
In the denitrating technique of house refuse power plant, SNCR and SCR is conventional treatment process.Be used alone the atmosphere pollutants emission standards that SNCR system has been difficult to reach required by environmental protection, in addition SNCR has certain disadvantages: reaction temperature is generally at 850 ~ 1100 DEG C, when reaction temperature is too high, decomposition due to ammonia can make NOX percent reduction reduce, when the reaction temperature is excessively low, the escape of ammonia increases, and NOX percent reduction also can be made to reduce.NH3 is high volatile volatile and noxious material, and the escape of ammonia can cause new environmental pollution; Be used alone SCR system, NOX emission compliance can be made.The reaction principle of SCR technology is under catalyst action, and the NOX burned in inner flue gas of the stove, in 250 ~ 450 DEG C of intervals, is optionally reduced to N2 containing amino reducing agent by temperature.SCR arrangement is divided into the low dirt of high-temperature high dust, high temperature and the low dirt of low temperature three kinds of arrangements usually.Employing high-temperature high dust is arranged, SCR reactor is arranged between economizer and air preheater, and coal-burning power plant mostly is this kind of arrangement; The low dirt arrangement of high temperature, after SCR reactor is arranged in deduster, because deduster need adopt hot precipitator, cost is higher, and therefore in engineering, application is few; The low dirt arrangement of low temperature, after SCR reactor is arranged in desulfation dust-extraction device.The flue gas heavy metal content that domestic waste incineration produces is higher, dust is relatively large, more easily causes catalyst poisoning relative to firepower electrical plant, greatly weakens catalyst activity, increases operation cost.Practicablely on house refuse power plant engineering mostly be the low dirt mode of low temperature, but it is very expensive usually to adopt thermal source to heat operating cost again to flue gas.
Utility model content
The utility model object is for above problem, provides the denitrating system that a kind of house refuse power plant that is cost-saving, that have high efficiency is energy-efficient.
The utility model comprises grate furnace, waste heat boiler, depickling reaction tower, sack cleaner, ash silo, low-temperature SCR reactor, air-introduced machine, chimney, SNCR spray gun, the first air compressor machine, softened water tank, SNCR ammonia water surge tank, the first ammonium hydroxide delivery pump, ammoniacal liquor holding vessel, the second ammonium hydroxide delivery pump, SCR ammoniacal liquor surge tank, ammonia evaporator, blender, the second air compressor machine;
The exhaust opening of described grate furnace is connected with the input of waste heat boiler, the output of described waste heat boiler is connected with the input of depickling reaction tower, the described output of depickling reaction tower is connected with the input of sack cleaner, the output of described sack cleaner is connected with the input of low-temperature SCR reactor, the described output of low-temperature SCR reactor is connected with the input of air-introduced machine, and the output of described air-introduced machine is connected with the input of chimney; In the bottom of described waste heat boiler, depickling reaction tower, sack cleaner, the pipeline be connected with ash silo is set respectively;
On the top of described grate furnace exhaust opening, SNCR spray gun is set, the input of described SNCR spray gun connects the output of SNCR ammonia water surge tank, softened water tank and the first air compressor machine respectively, and the input of described SNCR ammonia water surge tank is connected with the output of the first ammonium hydroxide delivery pump; Described ammoniacal liquor holding vessel is provided with two outputs, is respectively the first output and the second output, and the first output of described ammoniacal liquor holding vessel is connected with the input of the first ammonium hydroxide delivery pump;
Second output of described ammoniacal liquor holding vessel is connected with the input of the second ammonium hydroxide delivery pump, the output of described second ammonium hydroxide delivery pump is connected with the input of SCR ammoniacal liquor surge tank, the output of described SCR ammoniacal liquor surge tank is connected with the input of ammonia evaporator, the output of described ammonia evaporator is connected with the ammonia input of blender, the described output of the second air compressor machine is connected with the air input of blender, and the output of described blender is connected with the input of low-temperature SCR reactor.
The utility model adopts " SNCR+ low-temperature SCR " to combine out of stock, and ammoniacal liquor holding vessel is SNCR system and low-temperature SCR system utility device, is both reducing agent storage elements.Reducing agent in ammoniacal liquor holding vessel is delivered to SNCR ammonia water surge tank by the first ammonium hydroxide delivery pump, discharge value of feedback by NOX again to realize quantitatively mixing with the soft water of softened water tank, spray gun is dispensed in suitable temperature window, in spray gun, the compressed air provided through air compressor machine is atomized ammoniacal liquor mixed solution, finally spray in the flue of burner hearth, reach the object of preliminary De NO X.In low-temperature SCR unit, the reducing agent in ammoniacal liquor holding vessel is delivered to SCR ammoniacal liquor surge tank by the second ammonium hydroxide delivery pump, reducing agent is through the effect of ammonia evaporator, with enter blender from the compressed air in air compressor machine and carry out after reducing agent fully dilutes, enter low-temperature SCR reactor, now the temperature of flue gas is 140 ~ 160 DEG C, the ammonia-spraying grid of flue gas in low-temperature SCR reactor, mixed cell, under the effect of low temperature catalyst, realize removing NOX.
The utility model has the advantages that (1) synchronously builds up SNCR+ low-temperature SCR, NOX emission request does not need transformation after promoting; (2) large number quipments can share, as tank used for storing ammonia, conveyor module, control module, and investment reduction cost; (3) SNCR, SCR reactor is used not fill catalyst when emission request is low; (4) install catalyst after emission request height, put into operation SCR; (5) flue-gas temperature after bag-type dust is at 140 ~ 160 DEG C, and traditional SCR technique needs to carry out heat exchange again to air, just can enter SCR reactor, and the present invention directly can carry out denitration reaction at this temperature, saves the heat energy of power plant; (6) flue gas after treatment enters desulfurizer and sack cleaner carries out desulfurization and dust removal process respectively, go out SO2 in flue gas and dust, avoid the infringement to follow-up low-temperature SCR catalyst, extend the service life of catalyst, there is certain economy; (7) the flue gas NOX concentration after present invention process process will be less than 100mg/Nm3, meets discharge standard, has high efficiency.
Accompanying drawing explanation
Fig. 1 is system principle diagram of the present utility model.
Detailed description of the invention
As shown in Figure 1, the utility model comprises grate furnace 1, waste heat boiler 2, depickling reaction tower 3, sack cleaner 4, ash silo 5, low-temperature SCR reactor 6, air-introduced machine 7, chimney 8, SNCR spray gun 9, first air compressor machine 10, softened water tank 11, SNCR ammonia water surge tank 12, first ammonium hydroxide delivery pump 13, ammoniacal liquor holding vessel 14, second ammonium hydroxide delivery pump 15, SCR ammoniacal liquor surge tank 16, ammonia evaporator 17, blender 18, second air compressor machine 19.
The exhaust opening of described grate furnace 1 is connected with the input of waste heat boiler 2, the output of described waste heat boiler 2 is connected with the input of depickling reaction tower 3, the output of described depickling reaction tower 3 is connected with the input of sack cleaner 4, the output of described sack cleaner 4 is connected with the input of low-temperature SCR reactor 6, the output of described low-temperature SCR reactor 6 is connected with the input of air-introduced machine 7, and the output of described air-introduced machine 7 is connected with the input of chimney 8; The pipeline 20 be connected with ash silo 5 is set respectively in the bottom of described waste heat boiler 2, depickling reaction tower 3, sack cleaner 4.
On the top of described grate furnace 1 exhaust opening, SNCR spray gun 9 is set, the input of described SNCR spray gun 9 connects the output of SNCR ammonia water surge tank 12, softened water tank 11 and the first air compressor machine 10 respectively, and the input of described SNCR ammonia water surge tank 12 is connected with the output of the first ammonium hydroxide delivery pump 13; Described ammoniacal liquor holding vessel 14 is provided with two outputs, is respectively the first output and the second output, and the first output of described ammoniacal liquor holding vessel 14 is connected with the input of the first ammonium hydroxide delivery pump 13.
Second output of described ammoniacal liquor holding vessel 14 is connected with the input of the second ammonium hydroxide delivery pump 15, the output of described second ammonium hydroxide delivery pump 15 is connected with the input of SCR ammoniacal liquor surge tank 16, the output of described SCR ammoniacal liquor surge tank 16 is connected with the input of ammonia evaporator 17, the output of described ammonia evaporator 17 is connected with the ammonia input of blender 18, the output of described second air compressor machine 19 is connected with the air input of blender 18, and the output of described blender 18 is connected with the input of low-temperature SCR reactor 6.
Claims (1)
1. the denitrating system that one way of life garbage power plant is energy-efficient, is characterized in that: comprise grate furnace, waste heat boiler, depickling reaction tower, sack cleaner, ash silo, low-temperature SCR reactor, air-introduced machine, chimney, SNCR spray gun, the first air compressor machine, softened water tank, SNCR ammonia water surge tank, the first ammonium hydroxide delivery pump, ammoniacal liquor holding vessel, the second ammonium hydroxide delivery pump, SCR ammoniacal liquor surge tank, ammonia evaporator, blender, the second air compressor machine;
The exhaust opening of described grate furnace is connected with the input of waste heat boiler, the output of described waste heat boiler is connected with the input of depickling reaction tower, the described output of depickling reaction tower is connected with the input of sack cleaner, the output of described sack cleaner is connected with the input of low-temperature SCR reactor, the described output of low-temperature SCR reactor is connected with the input of air-introduced machine, and the output of described air-introduced machine is connected with the input of chimney; In the bottom of described waste heat boiler, depickling reaction tower, sack cleaner, the pipeline be connected with ash silo is set respectively;
On the top of described grate furnace exhaust opening, SNCR spray gun is set, the input of described SNCR spray gun connects the output of SNCR ammonia water surge tank, softened water tank and the first air compressor machine respectively, and the input of described SNCR ammonia water surge tank is connected with the output of the first ammonium hydroxide delivery pump; Described ammoniacal liquor holding vessel is provided with two outputs, is respectively the first output and the second output, and the first output of described ammoniacal liquor holding vessel is connected with the input of the first ammonium hydroxide delivery pump;
Second output of described ammoniacal liquor holding vessel is connected with the input of the second ammonium hydroxide delivery pump, the output of described second ammonium hydroxide delivery pump is connected with the input of SCR ammoniacal liquor surge tank, the output of described SCR ammoniacal liquor surge tank is connected with the input of ammonia evaporator, the output of described ammonia evaporator is connected with the ammonia input of blender, the described output of the second air compressor machine is connected with the air input of blender, and the output of described blender is connected with the input of low-temperature SCR reactor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520665629.8U CN204891590U (en) | 2015-08-31 | 2015-08-31 | Energy -efficient deNOx systems of domestic waste power plant |
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| CN201520665629.8U CN204891590U (en) | 2015-08-31 | 2015-08-31 | Energy -efficient deNOx systems of domestic waste power plant |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106215563A (en) * | 2016-09-21 | 2016-12-14 | 光大环保技术研究院（深圳）有限公司 | Garbage-incineration smoke purifying processing system |
| CN106994302A (en) * | 2017-05-03 | 2017-08-01 | 江苏天楹环保能源成套设备有限公司 | A kind of new and effective SCR denitration system |
| CN107376639A (en) * | 2017-09-20 | 2017-11-24 | 山东大学 | A kind of dangerous waste incineration flue gas purifying method |
-
2015
- 2015-08-31 CN CN201520665629.8U patent/CN204891590U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106215563A (en) * | 2016-09-21 | 2016-12-14 | 光大环保技术研究院（深圳）有限公司 | Garbage-incineration smoke purifying processing system |
| CN106994302A (en) * | 2017-05-03 | 2017-08-01 | 江苏天楹环保能源成套设备有限公司 | A kind of new and effective SCR denitration system |
| CN107376639A (en) * | 2017-09-20 | 2017-11-24 | 山东大学 | A kind of dangerous waste incineration flue gas purifying method |
| CN107376639B (en) * | 2017-09-20 | 2020-07-24 | 山东大学 | Hazardous waste incineration flue gas purification method |
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