CN105327619A - Low-temperature SCR reactor, smoke low-temperature denitration system, smoke treatment system and smoke treatment method - Google Patents
Low-temperature SCR reactor, smoke low-temperature denitration system, smoke treatment system and smoke treatment method Download PDFInfo
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- CN105327619A CN105327619A CN201510884333.XA CN201510884333A CN105327619A CN 105327619 A CN105327619 A CN 105327619A CN 201510884333 A CN201510884333 A CN 201510884333A CN 105327619 A CN105327619 A CN 105327619A
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Abstract
The invention discloses a low-temperature SCR reactor. A box-type catalyst module is arranged in a reactor shell and comprises a plurality of catalyst layers which are arranged in the air inlet and air outlet directions of the reactor and contain granular catalysts. Air inlet channels or air outlet channels are reserved between the catalyst layers, and the air inlet channels and the air outlet channels are arranged alternately. The invention further discloses a smoke low-temperature denitration system comprising the low-temperature SCR reactor, a smoke treatment system comprising the smoke low-temperature denitration system and a smoke treatment method adopting the smoke treatment system. The low-temperature SCR reactor has the advantages of being low in energy consumption, small in pressure drop and high in efficiency and is suitable for being applied and popularized in the industry field.
Description
Technical field
The present invention relates to field of Environment Protection, particularly relate to a kind of low-temperature SCR reactor, flue gas low-temperature denitrating system, smoke processing system and processing method.
Background technology
Along with socioeconomic fast development, worse and worse, environmental issue has become one of major issue that each metropolitan urgent need solves to air quality.
At present, garbage burning factory is the same with power plants such as fire coal, fuel oils, and the flue gas entered in atmospheric environment also can contain a certain amount of soot dust granule thing, HCl, HF, SO
2with atmosphere pollutions such as NOx sour gas and dioxin halogenated compounds.To this, the house refuse power plant of China all designs at afterbody and installs the flue gas purifying equipments such as depickling reaction tower, sack cleaner, successfully controls flue dust, particle and ease of solubility sour gas.But the NOx in flue gas, because the overwhelming majority is that NO is not soluble in water, effectively can not be removed by existing depickling reaction tower, cause high concentration to be discharged.
In domestic waste incineration, because the content of beary metal in flue gas is high than large thermal power plant, more easily cause SCR catalyst poisoning, greatly weaken SCR catalyst active, the Italian Brescia garbage burning factory being 33t/h in garbage disposal scale adopts high-temperature high dust to arrange SCR flue gas denitrification system, run after 2 years, catalyst poisoning, blocking seriously, not yet have large-scale engineer applied at present.With regard to garbage power plant, the temperature of flue gas of refuse burning after desulfurization and dedusting is probably at 150 DEG C about-170 DEG C, in engineering, practicable SCR flue gas denitrification system mostly is the low dirt arrangement of low temperature, but the flue gas denitrification system of this kind of arrangement has following features: construction cost aspect: SCR technology needs larger space, newly added equipment is more, as catalytic reactor, heat exchanger etc., catalyst due to SCR needs to be arranged in reactor, manufacture reactor, front and back connect flue and all will consume great deal of steel to the steel construction etc. that reactor and flue support.If transformed old factory, the extending capacity reformation of afterbody air-introduced machine also increases certain cost.Operating cost aspect: flue gas denitrification system needs heat to heat to reach the active temperature of catalyst reaction again to tail flue gas, causes additional energy source consumption; Because front and back connect on-way resistance and the local resistance of flue, it is a lot of that catalyst in reactor pressure drop and heat exchanger pressure drop make whole system resistance increase, be generally about 1000Pa, have even up to about 2500Pa, cause the larger electromotive power output of air-introduced machine needs.
As can be seen here, in use, obviously still there is many defects, and be urgently further improved in above-mentioned existing low-temperature SCR reactor, the out of stock system of flue gas and smoke processing system.How to found that a kind of low-temperature space energy consumption is low, pressure drop is little, high efficiency and equipment occupation space is little and the low-temperature SCR reactor of applied range, flue gas low-temperature denitrating system and smoke processing system, the real target belonging to current industry pole and need improve.
Summary of the invention
The technical problem to be solved in the present invention be to provide a kind of invest low, take up an area less, low-temperature SCR reactor in the little flue gas low-temperature denitrating system of pressure drop.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of low-temperature SCR reactor, comprise reactor shell, described reactor shell one end is air inlet, and the other end is gas outlet, is provided with box catalyst module in described reactor shell; Described box catalyst module comprise arrange along reactor inlet, outlet direction, built with the catalyst layer of pellet type catalyst, described catalyst layer has multiple, leave air inlet or outlet passageway between catalyst layer, described inlet channel and outlet passageway interval are arranged.
Further, described pellet type catalyst adopts trifolium-shaped structure.
Further, the catalyst carrier of described pellet type catalyst is Ti0
2, active component is V
20
5.
Further, described box catalyst module is multiple, and described multiple box catalyst module is set up in parallel, and only arranges one deck along reactor inlet, outlet direction.
Further, described reactor shell is built with dust cover, and described dust cover upper and lower surface adopts metal grill, with multiple box catalyst module, its shape arranges that form fit is consistent.
The another one technical problem that the present invention will solve is to provide that a kind of energy consumption is low, pressure drop is little, efficiency is high, equipment occupation space is little and the flue gas low-temperature denitrating system of applied range.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of flue gas low-temperature denitrating system, comprises for ammonia part, ammonia/air mixer, flue gas/reducing agent blender, air-introduced machine, also comprises above-mentioned low-temperature SCR reactor; The described ammonia outlet for ammonia part connects the first air inlet of ammonia/air mixer, the gas outlet of described ammonia/air mixer connects the air inlet of flue gas/reducing agent blender, the gas outlet of described flue gas/reducing agent blender connects the air inlet of low-temperature SCR reactor, and the described gas outlet of low-temperature SCR reactor is connected with the air inlet of air-introduced machine; Described ammonia/air mixer is also provided with the second air inlet.
Further, ammonia dilution air, ammonia dilution wind heater is also comprised; The gas outlet of described low-temperature SCR reactor is also connected with the air inlet of ammonia dilution air; The gas outlet of described ammonia dilution air is connected with the second air inlet of ammonia/air mixer, is provided with described ammonia dilution wind heater between the two.
Further, described low-temperature SCR reactor is also provided with bypass duct, and one end of described bypass duct is connected with the gas outlet of flue gas/reducing agent blender, and the other end is connected with the air inlet of air-introduced machine; Described bypass duct is provided with by-pass damper, and the inlet, outlet of described low-temperature SCR reactor is also respectively arranged with baffle plate.
The 3rd technical problem that the present invention will solve is to provide that a kind of energy consumption is low, pressure drop is little, efficiency is high, equipment occupation space is little and the smoke processing system of applied range.
For solving the problems of the technologies described above, the following technical scheme of the present invention:
A kind of smoke processing system, the sack cleaner comprising extracting tower and be connected with extracting tower, also comprises above-mentioned flue gas low-temperature denitrating system, and described flue gas low-temperature denitrating system is connected with the gas outlet of sack cleaner.
Present invention also offers a kind of flue gas processing method, apply above-mentioned smoke processing system and carry out fume treatment; The flue-gas temperature of described sack cleaner gas outlet is 150 DEG C-170 DEG C; Described flue gas after semidry method depickling, sack cleaner dedusting, the SO in flue gas
2, HCl and dust harmful constituent concentration is respectively lower than 80mg/m
3, 50mg/m
3and 20mg/m
3.
After adopting such design, the present invention at least has the following advantages:
1, low-temperature SCR reactor adopts box catalyst moduleization to design, and catalyst layer is set up in parallel, and both sides are provided with air inlet, outlet passageway, and flue gas enters through catalyst layer from inlet channel, pass from outlet passageway, has the advantages that pressure drop is little.
2, catalyst layer is built with pellet type catalyst, the feature that it has, and specific area is large, the life-span is long, and catalyst module demand is few, and reactor size is little, and the equipment that therefore greatly saves takes up an area and equipment investment; Because the catalyst adopted has lower starting catalytic temperature and higher specific area characteristic, make it have low temperature, high activity feature.
3, catalyst is cloverleaf pattern and thinner catalyst layer, has the lower pressure loss, makes it have the feature that pressure drop is little,
4, box catalyst module individual layer arrangement form, and traditional SCR reactor adopts honeycomb-shaped catalyst module, adopts the arrangement form of " 2+1 " or " 3+1 ", relatively has the feature that pressure drop is little.
5, because the flue gas of sack cleaner outlet does not need heat temperature raising again, can directly enter low-temperature SCR reaction system, thus without the need to increasing heat exchanger, therefore the equipment that greatly saves takes up an area and equipment investment, due to without heat exchanger pressure drop and catalyst pressure drop little, therefore without the need to changing high-power air-introduced machine, equipment investment is greatly reduced.
6, ammonia dilution air is taken from the band temperature neat stress after low-temperature denitration, but not normal temperature air, this reduces the energy ezpenditure raising ammonia dilution air temperature.
7, flue gas directly enters low-temperature SCR reactor and carries out denitration reaction after extracting tower, sack cleaner, does not need the heat temperature raising again of flue gas, greatly reduces energy ezpenditure.
Accompanying drawing explanation
Above-mentioned is only the general introduction of technical solution of the present invention, and in order to better understand technological means of the present invention, below in conjunction with accompanying drawing and detailed description of the invention, the present invention is described in further detail.
Fig. 1 is the structural representation of a kind of smoke processing system provided by the invention.
Fig. 2 is the box catalyst module structural representation in low-temperature SCR reactor.
Detailed description of the invention
Embodiment one
A kind of flue gas low-temperature denitrating system that the embodiment of the present invention one provides is applicable to the fume treatment of industrial circle.As shown in Figure 1, a kind of flue gas low-temperature denitrating system that the present embodiment provides, comprising: for ammonia part, ammonia/air mixer 8, flue gas/reducing agent blender 10, low-temperature SCR reactor 11, air-introduced machine 23.Ammonia outlet for ammonia part connects the first air inlet of ammonia/air mixer 8, the gas outlet of ammonia/air mixer 8 connects the air inlet of flue gas/reducing agent blender 10, the gas outlet of flue gas/reducing agent blender 10 connects the air inlet of low-temperature SCR reactor 11, and the gas outlet of low-temperature SCR reactor 11 is connected with the air inlet of air-introduced machine 23; Ammonia/air mixer 8 is also provided with the second air inlet.
In order to ensure that the pressure drop when carrying out denitration reaction of flue gas low-temperature denitrating system is little, saving equipment takes up an area and construction cost, low-temperature SCR reactor 11 wherein can adopt following preferred mode, coordinates shown in Fig. 2:
Low-temperature SCR reactor 11 comprises reactor shell, and reactor shell one end is air inlet, and the other end is gas outlet, is provided with box catalyst module in reactor shell.
Box catalyst module comprise arrange along reactor inlet, outlet direction, built with the catalyst layer 101 of pellet type catalyst, catalyst layer has multiple, inlet channel 102 or outlet passageway 103 is left between catalyst layer, inlet channel 102 and outlet passageway 103 interval are arranged, inlet channel 102 upper end open, lower end closed, outlet passageway 103 lower ending opening, upper end closed, enclosure portion can adopt seal cover 105.Connected by connector 104 and seal cover 105 between multiple catalyst layer 101.Box catalyst module housing 107 can arrange suspender 106, for being hung in reactor shell by box catalyst module.Box catalyst module enclosure material can adopt stainless steel OCr18Ni9 material, and its shape can be square or cuboid.
Above-mentioned pellet type catalyst preferably adopts trifolium-shaped structure.The catalyst carrier of pellet type catalyst is Ti0
2, active component is V
20
5, color is generally yellow or brown color.This pellet type catalyst, has that specific area is large, mechanical strength is high, Heat stability is good, the life-span is long, Sulfur tolerance is good and bed pressure drop is a low feature.This pellet type catalyst is applicable to low temperature (can be low to moderate 150 DEG C), Gao Shui (20%-40%), sulfur-bearing (80mg/m
3), chloride (50mg/m
3) complicated flue gas condition.
Above-mentioned box catalyst module can arrange multiple, and multiple box catalyst module is set up in parallel, and only arranges one deck along reactor inlet, outlet direction.This box catalyst module can realize independent replacing.
Above-mentioned low-temperature SCR reactor 11 is built with dust cover, described dust cover upper and lower surface adopts metal grill, upper and lower surface preferably adopts the metal grill of OCr18Ni9 material, frame is processed by the steel plate of OCr18Ni9 material, with multiple box catalyst module, its shape arranges that form fit is consistent.Dust cover is set and multiple box catalyst module arranges that the benefit of form fit is, blocking catalyst when preventing air inlet kind of dust height.
Above-mentioned low-temperature SCR reactor 11 material can adopt carbon steel, and its inlet, outlet establishes non-metal expansion joint, and its shell is provided with heat-insulation layer.Low-temperature SCR shell of reactor is made up of upper, middle and lower three part, and upper and lower two parts are flue gas import and export positions, and centre is loading catalyst position.In the middle part of reactor and bottom arranges Pressure gauge, not only can vertically arrange but also can lateral arrangement.
In order to ensure that flue gas low-temperature denitrating system reduces energy loss when denitration reaction, denitration efficiency height can adopt following preferred mode:
Flue gas low-temperature denitrating system also comprises ammonia dilution air 6, ammonia dilution wind heater 7.The gas outlet of low-temperature SCR reactor 11 is also connected with the air inlet of ammonia dilution air 6; The gas outlet of ammonia dilution air 6 is connected with the second air inlet of ammonia/air mixer 8, is provided with described ammonia dilution wind heater 7 between the two.
Ammonia for ammonia part fully mixes in ammonia/air mixer 8 with flue gas, enter in flue gas/reducing agent blender 10, enter together in low-temperature SCR reactor 11 after fully mixing and carry out denitration reaction, a flue gas part after reaction purification enters low-temperature SCR reactor again after ammonia dilution air 6 mixes with ammonia, and another part enters chimney 24 through air-introduced machine 23 and discharges.
Above-mentioned low-temperature SCR reactor 11 is also provided with bypass duct 12, and one end of described bypass duct 12 is connected with the gas outlet of flue gas/reducing agent blender 10, and the other end is connected with the air inlet of air-introduced machine 23; Described bypass duct is provided with by-pass damper 15, the outlet, inlet mouth of described low-temperature SCR reactor 11 is also respectively arranged with SCR inlet baffle 13 and SCR outlet damper 14.When flue gas low-temperature denitrating system first allows flue gas enter chimney by by-pass damper door when debugging, starting, stop and breaking down; When after system stability, then open SCR inlet baffle 13 and the SCR outlet damper 14 of SCR reactor 11, make flue gas enter low-temperature SCR reactor 11 and carry out denitration reaction.
In order to ensure the effective supply of ammonia, following preferred mode can be adopted:
Comprise for ammonia part the liquid ammonia storage tank 1, liquefied ammonia delivery pump 2, liquid ammonia evaporator 3, ammonia surge tank 4 and the distribution and computation device 5 that connect successively, the gas outlet of described distribution and computation device 5 is connected with the first air inlet of ammonia/air mixer 8.The supply of liquefied ammonia is transported by liquefied ammonia tank vehicle, utilize liquefied ammonia discharging compressor that liquefied ammonia is inputted liquid ammonia storage tank 1 by tank car, with liquefied ammonia delivery pump 2 liquefied ammonia in liquid ammonia storage tank 1 is transported in liquid ammonia evaporator 3 and is evaporated to ammonia, certain pressure and flow thereof is controlled through ammonia surge tank 4 and distribution and computation device 5, then, after mixing in ammonia/air mixer 8 with dilution flue gas, enter low-temperature SCR reactor 11 and carry out denitration reaction.
Said system also comprises ammonia-spraying grid 9, and the gas outlet of ammonia/air mixer 8 is first connected with the air inlet of flue gas/reducing agent blender 10 through ammonia-spraying grid 9 again, and described ammonia-spraying grid 9 is also provided with smoke air inlet.Also flue gas can be sprayed in flue gas/reducing agent blender 10, to accelerate flow of flue gas speed by ammonia-spraying grid 9.
The embodiment of the present invention greatly reduces energy ezpenditure when carrying out denitrating flue gas reaction, reaction efficiency high and low temperature SCR reactor adopts box catalyst moduleization to design, there is the feature of low pressure drop, without the need to carrying out pressure drop by heat exchanger, therefore do not need to change high-power air-introduced machine, greatly reduce equipment investment and production cost, can be used widely at industrial circle, be suitable for applying.
Embodiment two
Based on above-described embodiment, the present embodiment two provides another scheme of the present invention.As shown in Figure 1, a kind of smoke processing system that the present embodiment provides, comprise: extracting tower 21 and the sack cleaner 22 be connected with extracting tower 21, also comprise the flue gas low-temperature denitrating system that embodiment is a kind of, described flue gas low-temperature denitrating system is connected with the gas outlet of sack cleaner 22.
Wherein, flue gas is successively through extracting tower 21, sack cleaner 22, then to enter flue gas/reducing agent blender 10 by ammonia-spraying grid 9 together with the ammonia in pipeline and enter in low-temperature SCR reactor 11 after mixing and carry out denitration reaction with spraying into, a flue gas part after reaction purification enters low-temperature SCR reactor 11 again after ammonia dilution air 6 mixes with ammonia, and another part enters chimney 24 through air-introduced machine 23 and discharges.
SO2, HCl after above-mentioned extracting tower 21 in flue gas and dust harmful constituent concentration of emission must meet the emission request of " consumer waste incineration Environmental capacity standard " (GB18485-2014).Namely the concentration of emission of SO2, HCl, dust respectively will lower than 80mg/m
3, 50mg/m
3and 20mg/m
3, meet the mithridatism of subsequent catalyst and resistance to dust requirement with this.
The flue-gas temperature in above-mentioned sack cleaner 22 exit is generally 150 DEG C about-170 DEG C.
Above-mentioned smoke processing system of the present invention can be arranged in the tail position of burning electricity generation factory, the i.e. rear end of sack cleaner, the flue gas of introducing low temperature, low dirt, low-sulfur carries out denitration reaction, and flexible arrangement can be used widely at industrial circle, is suitable for applying.
The above; it is only preferred embodiment of the present invention; not do any pro forma restriction to the present invention, those skilled in the art utilize the technology contents of above-mentioned announcement to make a little simple modification, equivalent variations or modification, all drop in protection scope of the present invention.
Claims (10)
1. a low-temperature SCR reactor, comprises reactor shell, and described reactor shell one end is air inlet, and the other end is gas outlet, it is characterized in that, is provided with box catalyst module in described reactor shell;
Described box catalyst module comprise arrange along reactor inlet, outlet direction, built with the catalyst layer of pellet type catalyst, described catalyst layer has multiple, leave air inlet or outlet passageway between catalyst layer, described inlet channel and outlet passageway interval are arranged.
2. low-temperature SCR reactor according to claim 1, is characterized in that, described pellet type catalyst adopts trifolium-shaped structure.
3. low-temperature SCR reactor according to claim 1, is characterized in that, the catalyst carrier of described pellet type catalyst is Ti0
2, active component is V
20
5.
4. the low-temperature SCR reactor according to any one of claim 1-3, is characterized in that, described box catalyst module is multiple, and described multiple box catalyst module is set up in parallel, and only arranges one deck along reactor inlet, outlet direction.
5. low-temperature SCR reactor according to claim 4, is characterized in that, described reactor shell is built with dust cover, and described dust cover upper and lower surface adopts metal grill, with multiple box catalyst module, its shape arranges that form fit is consistent.
6. a flue gas low-temperature denitrating system, is characterized in that, comprises for ammonia part, ammonia/air mixer, flue gas/reducing agent blender, air-introduced machine, also comprises the low-temperature SCR reactor described in any one of claim 1-5;
The described ammonia outlet for ammonia part connects the first air inlet of ammonia/air mixer, the gas outlet of described ammonia/air mixer connects the air inlet of flue gas/reducing agent blender, the gas outlet of described flue gas/reducing agent blender connects the air inlet of low-temperature SCR reactor, and the described gas outlet of low-temperature SCR reactor is connected with the air inlet of air-introduced machine;
Described ammonia/air mixer is also provided with the second air inlet.
7. flue gas low-temperature denitrating system according to claim 6, is characterized in that, also comprises ammonia dilution air, ammonia dilution wind heater;
The gas outlet of described low-temperature SCR reactor is also connected with the air inlet of ammonia dilution air; The gas outlet of described ammonia dilution air is connected with the second air inlet of ammonia/air mixer, is provided with described ammonia dilution wind heater between the two.
8. the flue gas low-temperature denitrating system according to claim 6 or 7, it is characterized in that, described low-temperature SCR reactor is also provided with bypass duct, and one end of described bypass duct is connected with the gas outlet of flue gas/reducing agent blender, and the other end is connected with the air inlet of air-introduced machine;
Described bypass duct is provided with by-pass damper, and the inlet, outlet of described low-temperature SCR reactor is also respectively arranged with baffle plate.
9. a smoke processing system, the sack cleaner comprising extracting tower and be connected with extracting tower, is characterized in that, also comprises the flue gas low-temperature denitrating system described in any one of claim 6-8, and described flue gas low-temperature denitrating system is connected with the gas outlet of sack cleaner.
10. a flue gas processing method, is characterized in that, application rights requires that the smoke processing system described in 9 carries out fume treatment;
The flue-gas temperature of described sack cleaner gas outlet is 150 DEG C-170 DEG C; Described flue gas after semidry method depickling, sack cleaner dedusting, the SO in flue gas
2, HCl and dust harmful constituent concentration is respectively lower than 80mg/m
3, 50mg/m
3and 20mg/m
3.
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|---|---|---|---|
| CN201510884333.XA CN105327619A (en) | 2015-12-04 | 2015-12-04 | Low-temperature SCR reactor, smoke low-temperature denitration system, smoke treatment system and smoke treatment method |
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| CN201510884333.XA CN105327619A (en) | 2015-12-04 | 2015-12-04 | Low-temperature SCR reactor, smoke low-temperature denitration system, smoke treatment system and smoke treatment method |
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| CN108325384A (en) * | 2018-04-12 | 2018-07-27 | 山东联盛环保科技有限公司 | A kind of full load equipment for denitrifying flue gas |
| CN108339386A (en) * | 2018-04-19 | 2018-07-31 | 武汉致衡环境安全工程技术有限公司 | A kind of system improving SCR denitration reactor inlet temperatures using flue gas recirculation |
| CN112191098A (en) * | 2020-09-30 | 2021-01-08 | 江苏扬子催化剂有限公司 | Low-temperature denitration granular catalyst and honeycomb catalyst series-parallel combined reaction process |
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| CN108339386A (en) * | 2018-04-19 | 2018-07-31 | 武汉致衡环境安全工程技术有限公司 | A kind of system improving SCR denitration reactor inlet temperatures using flue gas recirculation |
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