CN217016094U - Novel fixed bed membrane dust removal denitration reactor - Google Patents
Novel fixed bed membrane dust removal denitration reactor Download PDFInfo
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- CN217016094U CN217016094U CN202220794337.4U CN202220794337U CN217016094U CN 217016094 U CN217016094 U CN 217016094U CN 202220794337 U CN202220794337 U CN 202220794337U CN 217016094 U CN217016094 U CN 217016094U
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- 239000012528 membrane Substances 0.000 title claims abstract description 70
- 239000000428 dust Substances 0.000 title claims abstract description 32
- 239000003054 catalyst Substances 0.000 claims abstract description 48
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 38
- 239000000919 ceramic Substances 0.000 claims abstract description 35
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 claims description 47
- 229910001220 stainless steel Inorganic materials 0.000 claims description 9
- 239000010935 stainless steel Substances 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 15
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 13
- 239000003546 flue gas Substances 0.000 abstract description 13
- 239000007789 gas Substances 0.000 abstract description 10
- 239000003344 environmental pollutant Substances 0.000 abstract description 5
- 231100000719 pollutant Toxicity 0.000 abstract description 5
- 238000002360 preparation method Methods 0.000 abstract description 4
- 239000000779 smoke Substances 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 230000007246 mechanism Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 230000003197 catalytic effect Effects 0.000 description 7
- 238000000746 purification Methods 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 3
- 238000006555 catalytic reaction Methods 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 231100000167 toxic agent Toxicity 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a novel fixed bed membrane dust removal denitration reactor, wherein the dust removal denitration reactor (1) comprises a silicon carbide ceramic membrane tube (2)(2) The fixed bed layer (3) is arranged in the reactor, and the fixed bed layer (3) comprises a catalyst layer (4) of which the catalyst is V2O5‑WO3/TiO2A catalyst. The fixed bed membrane dust removal denitration reactor membrane layer intercepts dust in the flue gas, and the catalyst bed layer in the membrane tube catalyzes and degrades nitrogen oxides in the flue gas, so that clean gas is discharged finally. Meanwhile, the catalyst can be modified according to smoke components so as to achieve the effect of removing multiple pollutants in a synergistic manner. The catalyst is placed in a fixed bed layer, so that the reaction mechanism is easy to further resolve and the membrane performance is improved. Because the contact area of the gas and the catalyst is increased, the proportion of V in the VWTi catalyst can be reduced, so that the VWTi catalyst is more environment-friendly and the preparation cost is reduced.
Description
Technical Field
The utility model relates to the technical field of dust removal and denitration, in particular to a novel fixed bed membrane dust removal and denitration reactor.
Background
At present, most of domestic flue gas purification systems are formed by multiple purification units, and a denitration system and a dust removal unit of the flue gas purification systems are mutually independent. The flue gas purification process flow of the coal-fired power plant is generally NH3SCR denitration, dedusting and desulfurization, and the technological process of flue gas purification in sintering, coking and other non-electric industries generally comprises desulfurization, dedusting and NH3-SCR denitration. For the former, a denitration system and a dust removal unit are independently arranged, so that the occupied area is large; in the latter case, the catalyst is easily poisoned by dust due to the dust removal and denitration. The catalyst is combined with the SiC ceramic membrane to realize the dust removal and NO removal x The coupling of the two solves the above problems. Chinese patent with patent number CN105435536A for denitration catalytic membrane filter material and preparation method thereofA porous film with the thickness of 000 mu m and good flexibility is prepared by2O5The dust removal and denitration integrated catalytic membrane is a main component. However, in such a catalytic membrane, since the pressure drop increases due to the catalyst supported on the membrane, the porosity becomes small, and the filtration pores are easily clogged at the time of filtration. At the same time, V2O5−WO3/ TiO2V in the catalyst2O5Is a highly toxic substance and causes great harm to the human environment, so that the reduction of the content of vanadium in the catalyst is also a problem to be solved urgently.
Disclosure of Invention
The utility model aims to provide a novel fixed bed membrane dedusting and denitration reactor, which reduces membrane preparation difficulty and further analyzes a reaction mechanism, better improves membrane performance, avoids the blockage of a catalytic integrated membrane pore channel caused by overlarge gas flux, increases the contact area of gas and a catalyst, can reduce the proportion of V in a VWTi catalyst, is more environment-friendly, and reduces preparation cost.
In order to achieve the above purpose, the utility model provides the following technical scheme: a novel fixed bed membrane dust removal denitration reactor comprises a dust removal denitration reactor, wherein a plurality of silicon carbide ceramic membrane tubes are arranged in the dust removal denitration reactor, one end of each silicon carbide ceramic membrane tube is communicated with an air inlet of the dust removal denitration reactor, and the other end of each silicon carbide ceramic membrane tube is communicated with an ash bucket; and a fixed bed layer is arranged in the silicon carbide ceramic membrane tube, and a catalyst layer is filled in the fixed bed layer.
The fixed bed membrane dust removal denitration reactor rete intercepts the dust in the flue gas, and the nitrogen oxide in the flue gas is degraded in the catalysis of the catalyst bed in the membrane tube, discharges clean gas finally.
Preferably, the main body of the selected membrane tube takes silicon carbide as a base material, and has the performances of acid and alkali corrosion resistance, high mechanical strength and the like, and the maximum service temperature reaches 1000 ℃.
Preferably, the catalyst in the catalyst layer is V2O5-WO3/TiO2Catalyst wherein the main catalyst is V2O5The cocatalyst is WO3。
Preferably, the fixed bed layer is divided into a layered fixed bed and a jacketed fixed bed; the fixed bed layer is multi-layer in a layered single pipe and single-layer in a jacketed single pipe. The fixed bed layer of the layered single tube is fixed in the silicon carbide ceramic tube in a sheet shape; the fixed bed layer of the jacketed single tube is in a U-shaped jacket shape and is fixed in the silicon carbide ceramic membrane tube.
Preferably, the fixed bed layer is composed of two layers of stainless steel screens, and the catalyst layer is arranged between the two layers of stainless steel screens. Stainless steel buckles are arranged at the top end and the bottom end in the silicon carbide ceramic tube and used for fixing the fixed bed layer. The fixed bed layer is connected to the bayonet of the silicon carbide ceramic membrane tube through a steel wire.
Compared with the prior art, the utility model has the beneficial effects that: the fixed bed membrane dust removal denitration reactor rete intercepts the dust in the flue gas, and the nitrogen oxide in the flue gas is degraded in the catalysis of the catalyst bed in the membrane tube, discharges clean gas finally. Meanwhile, the catalyst can be modified according to smoke components so as to achieve the effect of removing multiple pollutants in a synergistic manner. The catalyst is placed in the fixed bed layer, so that the reaction mechanism is easy to further analyze, the membrane performance is improved, and the contact area of the gas and the catalyst is increased. Meanwhile, the blockage of the catalytic integrated membrane pore channel caused by overlarge gas flux can be avoided. The separation of the catalyst from the membrane tubes increases the contact area of the gas with the catalyst. The novel fixed bed membrane dedusting and denitration reactor can simultaneously carry out high-temperature dedusting and NO x Carrying out catalytic degradation; measured to intercept solid particles (PM 0.3) with diameter less than or equal to 0.3 micron and NO in the smoke x The degradation rate of the catalyst is more than 99.99 percent, and the catalyst reaches the national ultra-low emission standard.
Drawings
FIG. 1 is a schematic view of a fixed bed layered overall structure of the present invention.
FIG. 2 is a schematic view of a jacketed overall structure of the fixed bed of the present invention.
FIG. 3 is a schematic view of a layered single tube structure of a fixed bed according to the present invention.
FIG. 4 is a schematic view of a jacketed single-tube configuration of the fixed bed of the present invention.
In the figure: 1. a dust removal denitration reactor; 2. a silicon carbide ceramic membrane tube; 3. fixing a bed layer; 4. a catalyst layer.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention.
Referring to fig. 1-4, the present invention provides a technical solution: a novel fixed bed membrane dust removal denitration reactor, wherein a silicon carbide ceramic membrane tube 2 is arranged in the dust removal denitration reactor 1, one end of the silicon carbide ceramic membrane tube 2 is communicated with an air inlet of the dust removal denitration reactor, and the other end of the silicon carbide ceramic membrane tube is communicated with an ash bucket; there is fixed bed 3 in the silicon carbide ceramic membrane pipe 2, and packs catalyst layer 4 in the fixed bed 3, inside silicon carbide ceramic membrane pipe 2 was arranged in to fixed bed 3, fixed bed 3 comprises two-layer stainless steel screen cloth, and catalyst layer 4 is arranged in the middle of two-layer stainless steel screen cloth. Stainless steel buckles are arranged at the top end and the bottom end inside the silicon carbide ceramic membrane tube 2 and used for fixing the fixed bed layer 3. The fixed bed layer 3 is connected and arranged on the bayonet of the silicon carbide ceramic membrane tube 2 through a steel wire.
Further, the catalyst in the catalyst layer 4 is V2O5-WO3/TiO2Catalyst, wherein the main catalyst is V2O5The cocatalyst is WO3. The fixed bed layer 3 is divided into a layered fixed bed and a jacketed fixed bed; the fixed bed layer 3 is a multilayer single tube and a single layer in a jacketed single tube. The fixed bed layer 3 of the layered single tube is fixed inside the silicon carbide ceramic membrane tube 2 in a sheet shape; the fixed bed layer 3 of the jacketed single tube is in a U-shaped jacket shape and is fixed inside the silicon carbide ceramic membrane tube 2.
The working principle is as follows: the dust-containing high-temperature flue gas flows through the fixed bed membrane dust removal and denitration reactor along with the airflow, and the membrane layer of the silicon carbide ceramic membrane tube 2 intercepts particulate pollutants, so that the particulate pollutants can not permeate the membrane surface, and large particulate matters in the dust-containing high-temperature flue gas can be settled and removed under the action of gravity. Residual nitrogen oxide in the high-temperature flue gas is contacted with a catalyst layer 4 in a fixed bed layer 3 in a silicon carbide ceramic membrane tube 2, and the catalyst directly degrades the nitrogen oxide into N at a proper temperature2And H2O, final clean gas fromDischarging from the tube side of the silicon carbide ceramic membrane tube 2. In addition, the fine particle pollutants deposited on the surface of the silicon carbide ceramic membrane tube 2 can be removed through back blowing, so that the silicon carbide ceramic membrane tube 2 is regenerated, and the dust interception efficiency and the catalytic degradation performance can be kept almost unchanged. Measured to intercept solid particles (PM 0.3) with diameter less than or equal to 0.3 micron and NO in the smoke x The degradation rate of the catalyst is more than 99.99 percent, and the catalyst reaches the national ultra-low emission standard.
Claims (6)
1. The utility model provides a novel fixed bed membrane dust removal denitration reactor, includes dust removal denitration reactor (1), its characterized in that: a plurality of silicon carbide ceramic membrane tubes (2) are arranged in the dedusting and denitration reactor (1), one end of each silicon carbide ceramic membrane tube (2) is communicated with an air inlet of the dedusting and denitration reactor, and the other end of each silicon carbide ceramic membrane tube is communicated with an ash bucket; the silicon carbide ceramic membrane tube is characterized in that a fixed bed layer (3) is arranged in the silicon carbide ceramic membrane tube (2), and a catalyst layer (4) is filled in the fixed bed layer (3).
2. The novel fixed bed membrane dedusting and denitration reactor according to claim 1, characterized in that: the silicon carbide ceramic membrane tube (2) takes silicon carbide as a support body and silicon carbide as a membrane layer.
3. The novel fixed bed membrane dedusting and denitration reactor as claimed in claim 1, characterized in that: the catalyst in the catalyst layer (4) is V2O5-WO3/TiO2Catalyst wherein the main catalyst is V2O5The cocatalyst is WO3。
4. The novel fixed bed membrane dedusting and denitration reactor as claimed in claim 1, characterized in that: the fixed bed layer (3) is divided into a layered fixed bed and a jacketed fixed bed; the fixed bed layer (3) is a multilayer single tube and a single layer in a jacketed single tube.
5. The novel fixed bed membrane dedusting and denitration reactor according to claim 4, characterized in that: the fixed bed layer (3) of the layered single tube is fixed inside the silicon carbide ceramic membrane tube (2) in a sheet shape; the fixed bed layer (3) of the jacketed single tube is in a U-shaped jacket shape and is fixed inside the silicon carbide ceramic membrane tube (2).
6. The novel fixed bed membrane dedusting and denitration reactor according to claim 1, characterized in that: the fixed bed layer (3) is composed of two layers of stainless steel screens, and the catalyst layer (4) is arranged between the two layers of stainless steel screens; stainless steel buckles are arranged at the top end and the bottom end inside the silicon carbide ceramic membrane tube (2) and used for fixing the fixed bed layer (3); the fixed bed layer (3) is connected to the bayonet of the silicon carbide ceramic membrane tube (2) through a steel wire.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220794337.4U CN217016094U (en) | 2022-04-07 | 2022-04-07 | Novel fixed bed membrane dust removal denitration reactor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220794337.4U CN217016094U (en) | 2022-04-07 | 2022-04-07 | Novel fixed bed membrane dust removal denitration reactor |
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| CN217016094U true CN217016094U (en) | 2022-07-22 |
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| CN202220794337.4U Active CN217016094U (en) | 2022-04-07 | 2022-04-07 | Novel fixed bed membrane dust removal denitration reactor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116139669A (en) * | 2023-04-04 | 2023-05-23 | 北京中航天业科技有限公司 | Ceramic catalytic filter element, preparation method and flue gas multi-pollutant collaborative purification system and method based on ceramic catalytic filter element |
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2022
- 2022-04-07 CN CN202220794337.4U patent/CN217016094U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116139669A (en) * | 2023-04-04 | 2023-05-23 | 北京中航天业科技有限公司 | Ceramic catalytic filter element, preparation method and flue gas multi-pollutant collaborative purification system and method based on ceramic catalytic filter element |
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