CN114768601A - A agitating unit for preparing low temperature denitration catalyst - Google Patents
A agitating unit for preparing low temperature denitration catalyst Download PDFInfo
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- CN114768601A CN114768601A CN202210533597.0A CN202210533597A CN114768601A CN 114768601 A CN114768601 A CN 114768601A CN 202210533597 A CN202210533597 A CN 202210533597A CN 114768601 A CN114768601 A CN 114768601A
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- 239000003054 catalyst Substances 0.000 title claims abstract description 136
- 238000003756 stirring Methods 0.000 claims abstract description 102
- 230000005540 biological transmission Effects 0.000 claims abstract description 8
- 238000009434 installation Methods 0.000 claims description 10
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000002156 mixing Methods 0.000 abstract description 23
- 239000000463 material Substances 0.000 abstract description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 50
- 239000002002 slurry Substances 0.000 description 50
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 50
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 42
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 33
- 239000000243 solution Substances 0.000 description 31
- AJGPQPPJQDDCDA-UHFFFAOYSA-N azanium;hydron;oxalate Chemical compound N.OC(=O)C(O)=O AJGPQPPJQDDCDA-UHFFFAOYSA-N 0.000 description 30
- 239000011259 mixed solution Substances 0.000 description 30
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Inorganic materials O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 description 30
- 238000011068 loading method Methods 0.000 description 26
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 21
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 21
- QGAVSDVURUSLQK-UHFFFAOYSA-N ammonium heptamolybdate Chemical compound N.N.N.N.N.N.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.[Mo].[Mo].[Mo].[Mo].[Mo].[Mo].[Mo] QGAVSDVURUSLQK-UHFFFAOYSA-N 0.000 description 20
- 239000011248 coating agent Substances 0.000 description 20
- 238000000576 coating method Methods 0.000 description 20
- 229910052681 coesite Inorganic materials 0.000 description 20
- 229910052906 cristobalite Inorganic materials 0.000 description 20
- 239000007788 liquid Substances 0.000 description 20
- 239000000741 silica gel Substances 0.000 description 20
- 229910002027 silica gel Inorganic materials 0.000 description 20
- 239000000377 silicon dioxide Substances 0.000 description 20
- 229910052682 stishovite Inorganic materials 0.000 description 20
- 239000004408 titanium dioxide Substances 0.000 description 20
- 229910052905 tridymite Inorganic materials 0.000 description 20
- 238000002360 preparation method Methods 0.000 description 13
- 235000006408 oxalic acid Nutrition 0.000 description 11
- UNTBPXHCXVWYOI-UHFFFAOYSA-O azanium;oxido(dioxo)vanadium Chemical compound [NH4+].[O-][V](=O)=O UNTBPXHCXVWYOI-UHFFFAOYSA-O 0.000 description 10
- 238000007664 blowing Methods 0.000 description 10
- 238000001354 calcination Methods 0.000 description 10
- 238000004364 calculation method Methods 0.000 description 10
- 238000001816 cooling Methods 0.000 description 10
- 229910052878 cordierite Inorganic materials 0.000 description 10
- 239000008367 deionised water Substances 0.000 description 10
- 229910021641 deionized water Inorganic materials 0.000 description 10
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 10
- 238000001035 drying Methods 0.000 description 10
- 238000000227 grinding Methods 0.000 description 10
- 239000002245 particle Substances 0.000 description 10
- 239000004576 sand Substances 0.000 description 10
- 239000007787 solid Substances 0.000 description 10
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 10
- 229910052720 vanadium Inorganic materials 0.000 description 10
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 238000002791 soaking Methods 0.000 description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000011343 solid material Substances 0.000 description 1
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Abstract
The invention discloses a stirring device for preparing a low-temperature denitration catalyst, which comprises a tank body, a rotatable main shaft, a pair of first stirring paddles symmetrically arranged and second stirring paddles uniformly distributed on the circumference, wherein a first gear and a second gear are fixedly arranged on the main shaft, a gear ring and an annular fixing plate are fixedly arranged on the inner wall of the upper part of the tank body, the second stirring paddles are simultaneously in meshing transmission connection with the first gear and the gear ring through a fourth gear, a support is fixedly arranged in the tank body and comprises a disc-shaped mounting part, an annular through hole is formed between the annular outer wall of the mounting part and the annular inner wall of the fixing plate, an annular connecting part is arranged above the through hole and is simultaneously in sliding connection with the mounting part and the fixing plate, the second stirring paddles penetrate through the connecting part and the through hole and are rotationally connected with the connecting part, and the first stirring paddles are in meshing transmission connection with the second gear through a third gear. The device provided by the invention can realize efficient, rapid and uniform mixing of catalyst materials, and improve the denitration performance of the low-temperature denitration catalyst.
Description
Technical Field
The invention relates to the technical field of denitration catalyst production equipment, in particular to a stirring device for preparing a low-temperature denitration catalyst.
Background
The SCR technology is the most widely applied flue gas denitration technology at present, and the applicable temperature of the low-temperature denitration catalyst is 300-420 ℃. For the non-electric industry, the components of flue gas generated in the production process are complex, the emission temperature is generally lower than 300 ℃, and if the existing high-temperature and low-temperature denitration catalyst is still used for denitration at the emission temperature, the problems of low catalyst activity and poor sulfur resistance occur, namely, the existing high-temperature denitration catalyst is not suitable for flue gas denitration in the non-electric industry. The low-temperature denitration catalyst has good low-temperature catalytic activity and sulfur resistance, and can be completely suitable for flue gas denitration in the non-electric industry. However, the stirring device for the existing low-temperature denitration catalyst generally adopts a bidirectional rotating shaft to drive a stirring rod to stir materials, and the stirring device cannot completely and efficiently and uniformly mix various solid and liquid materials of the low-temperature denitration catalyst, so that the denitration efficiency of the catalyst is affected, and therefore the stirring device needs to be improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the stirring device for preparing the low-temperature denitration catalyst, which can realize efficient, rapid and uniform mixing of catalyst materials and improve the denitration performance of the low-temperature denitration catalyst.
In order to achieve the purpose, the invention adopts the following technical scheme:
a stirring device for preparing a low-temperature denitration catalyst comprises a tank body, a rotatable main shaft, a pair of first stirring paddles symmetrically arranged, and second stirring paddles uniformly distributed on the circumference, a first gear and a second gear are fixedly arranged on the main shaft, a toothed ring and an annular fixing plate are fixedly arranged on the inner wall of the upper part of the tank body, the second stirring paddle is meshed with the first gear and the gear ring through a fourth gear in a transmission way, a support is fixedly arranged in the tank body, the support comprises a disc-shaped mounting part, an annular through hole is formed between the annular outer wall of the mounting part and the annular inner wall of the fixing plate, an annular connecting piece is arranged above the through hole, and annular connecting piece simultaneously with installation department and fixed plate sliding connection, the second stirring rake passes connecting piece and through-hole and second stirring rake and is connected with the connecting piece rotation, first stirring rake passes through the third gear and is connected with the meshing transmission of second gear.
The periphery of the first gear is distributed with fourth gears, the second stirring paddle comprises a second shaft rod, the second shaft rod is fixedly arranged on the fourth gears in a penetrating mode, and the second shaft rod penetrates through the connecting piece and the through hole and is rotatably connected with the connecting piece.
The fixing plate is provided with an annular first slide rail, the mounting part is provided with an annular second slide rail, and the first slide rail and the second slide rail are provided with annular connecting pieces in a sliding manner.
The main shaft is rotatably arranged between the top of the tank body and the mounting part.
The first stirring paddle comprises a first shaft rod, the third gear is fixed on the first shaft rod, and the first shaft rod penetrates through the installation part and is connected with the installation part in a rotating mode.
The support includes the stand perpendicular with the installation department, the stand links firmly with jar body bottom.
The invention has the beneficial effects that: utilize a pair of first stirring rake of agitating unit to stir in jar body center department, the limit rotation limit revolution mode through the second stirring rake simultaneously stirs at a pair of first stirring rake periphery again, has realized the high-efficient quick homogeneous mixing of catalyst material, and then improves the denitration performance of low temperature denitration catalyst.
Drawings
FIG. 1 is a schematic structural view of a stirring apparatus according to the present invention;
fig. 2 is an enlarged view of a point a in fig. 1.
In the figure: the tank body 1, the toothed ring 11, the main shaft 2, the first gear 21, the second gear 22, the first stirring paddle 3, the first shaft lever 31, the third gear 32, the second stirring paddle 4, the second shaft lever 41, the fourth gear 42, the support 5, the mounting part 51, the upright post 52, the second slide rail 53, the fixing plate 6, the first slide rail 61, the connecting piece 7, the through hole 8 and the motor 9.
Detailed Description
The invention is further described with reference to the accompanying drawings and the detailed description below:
as shown in FIGS. 1-2, a agitating unit for preparing low temperature denitration catalyst, including jar body 1, rotatable main shaft 2, the first stirring rake 3 of a pair of symmetry setting, the second stirring rake 4 of circumference equipartition, main shaft 2 is rotatory through the drive of motor 9.
The periphery of the first gear 21 is distributed with fourth gears 42, the gear ring 11 and the fixing plate 6 are arranged up and down, the first gear 21, the gear ring 11 and the fourth gears 42 are located at the same height, and the fourth gears 42 are meshed with the first gear 21 and the gear ring 11 simultaneously. The second stirring paddle 4 comprises a second shaft rod 41, the second shaft rod 41 is fixedly arranged on the fourth gear 42 in a penetrating mode, the second shaft rod 41 penetrates through the connecting piece 7 and the through hole 8, and the second shaft rod 41 is rotatably connected with the connecting piece 7. The structure that the second shaft rod 41 is rotatably arranged on the connecting piece 7 can ensure that the fourth gear 42 can stably transmit the first gear 21 and the gear ring 11.
Be equipped with the first slide rail 61 of annular on the fixed plate 6, be equipped with annular second slide rail 53 on the installation department 51, first slide rail 61 sets up at fixed plate 6 upper surface promptly, and second slide rail 53 sets up at installation department 51 upper surface, slidable mounting annular connecting piece 7 on first slide rail 61 and the second slide rail 53. In the invention, the components such as the gear ring 11, the first gear 21, the second gear 22, the third gear 32, the fourth gear 42 and the like are all positioned above the mounting part 51, and the through hole 8 is covered by the connecting piece 7, so that the materials can be prevented from entering the upper part of the tank body 1 to influence normal stirring.
The main shaft 2 is rotatably arranged between the top of the tank body 1 and the mounting part 51.
The first stirring paddle 3 comprises a first shaft rod 31, the third gear 32 is fixed on the first shaft rod 31, and the first shaft rod 31 penetrates through the mounting part 51 and is connected with the mounting part 51 in a rotating mode.
The support 5 comprises a column 52 perpendicular to the mounting part 51, and the column 52 is fixedly connected with the bottom of the tank body 1.
The working process of the stirring device of the invention is as follows: the motor 9 drives the main shaft 2 to rotate, the main shaft 2 drives the third gear 32 to rotate through the second gear 22, and then the first stirring paddle 3 is enabled to stir at the center of the tank body 1, meanwhile, the main shaft 2 drives the fourth gear 42 to rotate through the first gear 21 and simultaneously takes the main shaft 2 as the center to do circular motion along the gear ring 11, and then the second stirring paddle 4 is enabled to stir in a rotation and revolution mode, so that efficient and sufficient stirring of materials is achieved.
The stirring device provided by the invention can be applied to preparation of a low-temperature denitration catalyst, and the specific embodiment is as follows:
example 1
A low-temperature denitration catalyst comprises a cordierite carrier and an active component coated on the carrier, wherein the loading amount of the active component is 3 wt%; the active component comprises 3 wt% of V2O510 wt% of MoO32.5% by weight of SiO282.2 wt% of TiO2And 2.3 wt% of phosphate ions, and the loading amount of the vanadium element in the active component in the low-temperature denitration catalyst is 5.04 wt%.
The preparation method of the low-temperature denitration catalyst comprises the following steps:
(a) adding deionized water into a stirring device, adding titanium dioxide while stirring, then adding oxalic acid-ammonium metavanadate mixed solution and ammonium heptamolybdate, wherein the oxalic acid-ammonium metavanadate mixed solution is formed by mixing oxalic acid solution with the mass concentration of 20% and ammonium metavanadate solution with the mass concentration of 30% according to the mass ratio of 1:1, stirring and mixing for 2 hours, then adding liquid silica gel, and continuously stirring for 1 hour to obtain initial slurry with the solid content of 20%; wherein the addition amounts of titanium dioxide, oxalic acid-ammonium metavanadate mixed solution, ammonium heptamolybdate and liquid silica gel are according to the TiO loaded in the low-temperature denitration catalyst2、V2O5、MoO3、SiO2Calculating the ratio of (A) to (B);
(b) grinding the primary slurry by a sand mill to obtain catalyst slurry with the particle size DN90 less than 4 mu m;
(c) according to the load calculation of the active components in the low-temperature denitration catalyst, coating the catalyst slurry on a carrier through coating equipment, and blowing the slurry remained on the wall of the carrier by using compressed air to obtain a primary catalyst product;
(d) calcining the primary catalyst product at 550 ℃ for 4h, cooling, immersing in a phosphoric acid solution with the concentration of 0.5mol/L for 3min, and drying at 75 ℃ for 3h to obtain a finished product, wherein the addition amount of phosphoric acid is calculated according to the loading amount of phosphate ions in the low-temperature denitration catalyst.
Example 2
A low-temperature denitration catalyst comprises a cordierite carrier and an active component coated on the carrier, wherein the loading amount of the active component is 1.8 wt%; the active component comprises 6.5 wt% of V2O53 wt% of MoO 33% by weight of SiO286.5 wt% of TiO2And 1% by weight of phosphate ions, and of the active componentThe loading amount of the vanadium element in the low-temperature denitration catalyst is 6.55 wt%.
The preparation method of the low-temperature denitration catalyst comprises the following steps:
(a) adding deionized water into a stirring device, adding titanium dioxide while stirring, then adding oxalic acid-ammonium metavanadate mixed solution and ammonium heptamolybdate, wherein the oxalic acid-ammonium metavanadate mixed solution is formed by mixing oxalic acid solution with the mass concentration of 20% and ammonium metavanadate solution with the mass concentration of 30% according to the mass ratio of 1:1, stirring and mixing for 2.5h, then adding liquid silica gel, and continuously stirring for 0.5h to obtain primary slurry with the solid content of 35%; wherein the addition amounts of titanium dioxide, oxalic acid-ammonium metavanadate mixed solution, ammonium heptamolybdate and liquid silica gel are according to the TiO loaded in the low-temperature denitration catalyst2、V2O5、MoO3、SiO2Calculating the ratio of (A) to (B);
(b) grinding the primary slurry by a sand mill to obtain catalyst slurry with the particle size DN90 less than 4 mu m;
(c) according to the load calculation of the active components in the low-temperature denitration catalyst, coating the catalyst slurry on a carrier through coating equipment, and blowing the slurry remained on the wall of the carrier by using compressed air to obtain a primary catalyst product;
(d) calcining the primary catalyst product at 600 ℃ for 5h, cooling, soaking in a phosphoric acid solution with the concentration of 0.5mol/L for 1min, and drying at 75 ℃ for 4h to obtain a finished product, wherein the addition amount of phosphoric acid is calculated according to the loading amount of phosphate ions in the low-temperature denitration catalyst.
Example 3
The low-temperature denitration catalyst comprises a cordierite carrier and an active component coated on the carrier, wherein the loading capacity of the active component is 1.1 wt%; the active component comprises 11.5 wt% of V2O512 wt% MoO33.7% by weight of SiO270 wt% of TiO2And 2.8 wt% of phosphate ions, and the loading amount of the vanadium element in the active component in the low-temperature denitration catalyst is 7.09 wt%.
The preparation method of the low-temperature denitration catalyst comprises the following steps:
(a) adding deionized water into a stirring device, adding titanium dioxide while stirring, then adding oxalic acid-ammonium metavanadate mixed solution and ammonium heptamolybdate, wherein the oxalic acid-ammonium metavanadate mixed solution is formed by mixing oxalic acid solution with the mass concentration of 20% and ammonium metavanadate solution with the mass concentration of 30% according to the mass ratio of 1:1, stirring and mixing for 3 hours, then adding liquid silica gel, and continuously stirring for 0.5 hour to obtain primary slurry with the solid content of 25%; wherein the addition amounts of titanium dioxide, oxalic acid-ammonium metavanadate mixed solution, ammonium heptamolybdate and liquid silica gel are according to the TiO loaded in the low-temperature denitration catalyst2、V2O5、MoO3、SiO2Calculating the ratio of (A) to (B);
(b) grinding the primary slurry by a sand mill to obtain catalyst slurry with the particle size DN90 less than 4 μm;
(c) according to the load calculation of the active components in the low-temperature denitration catalyst, coating the catalyst slurry on a carrier through coating equipment, and blowing the slurry remained on the wall of the carrier by using compressed air to obtain a primary catalyst product;
(d) calcining the primary catalyst product at 500 ℃ for 4h, cooling, soaking in a phosphoric acid solution with the concentration of 0.5mol/L for 1min, and drying at 85 ℃ for 4h to obtain a finished product, wherein the addition amount of phosphoric acid is calculated according to the loading amount of phosphate ions in the low-temperature denitration catalyst.
Example 4
A low-temperature denitration catalyst comprises a cordierite carrier and an active component coated on the carrier, wherein the loading amount of the active component is 2.3 wt%; the active component comprises 5 wt% of V2O54.6 wt% of MoO32.8% by weight of SiO284.6 wt% of TiO2And 3 wt% of phosphate ions, and the loading amount of vanadium element in the active component in the low-temperature denitration catalyst is 6.44 wt%.
The preparation method of the low-temperature denitration catalyst comprises the following steps:
(a) adding deionized water into a stirring device, adding titanium dioxide while stirring, and then addingAdding oxalic acid-ammonium metavanadate mixed solution and ammonium heptamolybdate, wherein the oxalic acid-ammonium metavanadate mixed solution is formed by mixing oxalic acid solution with the mass concentration of 20% and ammonium metavanadate solution with the mass concentration of 30% according to the mass ratio of 1:1, stirring and mixing for 3 hours, adding liquid silica gel, and continuously stirring for 1 hour to obtain initial slurry with the solid content of 20%; wherein the addition amounts of titanium dioxide, oxalic acid-ammonium metavanadate mixed solution, ammonium heptamolybdate and liquid silica gel are in accordance with the TiO loaded in the low-temperature denitration catalyst2、V2O5、MoO3、SiO2Calculating the ratio of (A) to (B);
(b) grinding the primary slurry by a sand mill to obtain catalyst slurry with the particle size DN90 less than 4 μm;
(c) according to the load calculation of the active components in the low-temperature denitration catalyst, coating the catalyst slurry on a carrier through coating equipment, and blowing the slurry remained on the wall of the carrier by using compressed air to obtain a primary catalyst product;
(d) calcining the primary catalyst product at 500 ℃ for 6h, cooling, immersing in a phosphoric acid solution with the concentration of 0.5mol/L for 2min, and drying at 80 ℃ for 3h to obtain a finished product, wherein the addition amount of phosphoric acid is calculated according to the loading amount of phosphate ions in the low-temperature denitration catalyst.
Example 5
The low-temperature denitration catalyst comprises a cordierite carrier and an active component coated on the carrier, wherein the loading capacity of the active component is 1.2 wt%; the active component comprises 12 wt% of V2O56 wt% of MoO33.3% by weight of SiO276.5 wt% of TiO2And 2.2 wt% of phosphate ions, and the loading amount of the vanadium element in the active component in the low-temperature denitration catalyst is 8.07 wt%.
The preparation method of the low-temperature denitration catalyst comprises the following steps:
(a) adding deionized water into a stirring device, adding titanium dioxide while stirring, and then adding oxalic acid-ammonium metavanadate mixed solution and ammonium heptamolybdate, wherein the oxalic acid-ammonium metavanadate mixed solution is prepared from oxalic acid solution with the mass concentration of 20% and oxalic acid solution with the mass concentration of 30%The ammonium metavanadate solution is formed by mixing according to the mass ratio of 1:1, liquid silica gel is added after stirring and mixing for 2 hours, and stirring is continued for 1 hour, so as to obtain initial slurry with the solid content of 30%; wherein the addition amounts of titanium dioxide, oxalic acid-ammonium metavanadate mixed solution, ammonium heptamolybdate and liquid silica gel are according to the TiO loaded in the low-temperature denitration catalyst2、V2O5、MoO3、SiO2Calculating the ratio of (A) to (B);
(b) grinding the primary slurry by a sand mill to obtain catalyst slurry with the particle size DN90 less than 4 mu m;
(c) according to the load calculation of the active components in the low-temperature denitration catalyst, coating the catalyst slurry on a carrier through coating equipment, and blowing the slurry remained on the wall of the carrier by using compressed air to obtain a primary catalyst product;
(d) calcining the primary catalyst product at 550 ℃ for 6h, cooling, soaking in a phosphoric acid solution with the concentration of 0.5mol/L for 3min, and drying at 80 ℃ for 4h to obtain a finished product, wherein the addition amount of phosphoric acid is calculated according to the load amount of phosphate ions in the low-temperature denitration catalyst.
Example 6
A low-temperature denitration catalyst comprises a cordierite carrier and an active component coated on the carrier, wherein the loading amount of the active component is 2.8 wt%; the active component comprises 4.1 wt% of V2O59 wt% of MoO 31% by weight of SiO285.1 wt% of TiO2And 0.8 wt% of phosphate ions, and the loading amount of the vanadium element in the active component in the low-temperature denitration catalyst is 6.43 wt%.
The preparation method of the low-temperature denitration catalyst comprises the following steps:
(a) adding deionized water into a stirring device, adding titanium dioxide while stirring, then adding oxalic acid-ammonium metavanadate mixed solution and ammonium heptamolybdate, wherein the oxalic acid-ammonium metavanadate mixed solution is formed by mixing oxalic acid solution with the mass concentration of 20% and ammonium metavanadate solution with the mass concentration of 30% according to the mass ratio of 1:1, stirring and mixing for 3 hours, adding liquid silica gel, and continuously stirring for 0.5 hour to obtain primary slurry with the solid content of 35%; it is provided withThe adding amounts of the medium titanium dioxide, the oxalic acid-ammonium metavanadate mixed solution, the ammonium heptamolybdate and the liquid silica gel are according to the TiO loaded in the low-temperature denitration catalyst2、V2O5、MoO3、SiO2Calculating the ratio of (A) to (B);
(b) grinding the primary slurry by a sand mill to obtain catalyst slurry with the particle size DN90 less than 4 mu m;
(c) according to the load calculation of the active components in the low-temperature denitration catalyst, coating the catalyst slurry on a carrier through coating equipment, and blowing the slurry remained on the wall of the carrier by using compressed air to obtain a primary catalyst product;
(d) calcining the primary catalyst product at 650 ℃ for 4h, cooling, soaking in a phosphoric acid solution with the concentration of 0.5mol/L for 2min, and drying at 75 ℃ for 3h to obtain a finished product, wherein the addition amount of phosphoric acid is calculated according to the loading amount of phosphate ions in the low-temperature denitration catalyst.
Example 7
A low-temperature denitration catalyst comprises a cordierite carrier and an active component coated on the carrier, wherein the loading amount of the active component is 1.5 wt%; the active component comprises 7.8 wt% of V2O512 wt% of MoO31.3% by weight of SiO278.3 wt% of TiO2And 0.6 wt% of phosphate ions, and the loading amount of vanadium element in the active component in the low-temperature denitration catalyst is 6.55 wt%.
The preparation method of the low-temperature denitration catalyst comprises the following steps:
(a) adding deionized water into a stirring device, adding titanium dioxide while stirring, then adding oxalic acid-ammonium metavanadate mixed solution and ammonium heptamolybdate, wherein the oxalic acid-ammonium metavanadate mixed solution is formed by mixing oxalic acid solution with the mass concentration of 20% and ammonium metavanadate solution with the mass concentration of 30% according to the mass ratio of 1:1, stirring and mixing for 2 hours, adding liquid silica gel, and continuously stirring for 0.5 hour to obtain initial slurry with the solid content of 20%; wherein the addition amounts of titanium dioxide, oxalic acid-ammonium metavanadate mixed solution, ammonium heptamolybdate and liquid silica gel are in accordance with the TiO loaded in the low-temperature denitration catalyst2、V2O5、MoO3、SiO2Calculating the ratio of (A) to (B);
(b) grinding the primary slurry by a sand mill to obtain catalyst slurry with the particle size DN90 less than 4 mu m;
(c) according to the load calculation of the active components in the low-temperature denitration catalyst, coating the catalyst slurry on a carrier through coating equipment, and blowing the slurry remained on the wall of the carrier by using compressed air to obtain a primary catalyst product;
(d) calcining the primary catalyst product at 600 ℃ for 5h, cooling, soaking in a phosphoric acid solution with the concentration of 0.5mol/L for 1min, and drying at 85 ℃ for 3h to obtain a finished product, wherein the addition amount of phosphoric acid is calculated according to the load amount of phosphate ions in the low-temperature denitration catalyst.
Example 8
The low-temperature denitration catalyst comprises a cordierite carrier and an active component coated on the carrier, wherein the loading capacity of the active component is 3.5 wt%; the active component comprises 4.2 wt% of V2O53.3 wt% of MoO31.8% by weight of SiO290 wt% of TiO2And 0.7 wt% of phosphate ions, and the loading amount of the vanadium element in the active component in the low-temperature denitration catalyst is 8.23 wt%.
The preparation method of the low-temperature denitration catalyst comprises the following steps:
(a) adding deionized water into a stirring device, adding titanium dioxide while stirring, then adding oxalic acid-ammonium metavanadate mixed solution and ammonium heptamolybdate, wherein the oxalic acid-ammonium metavanadate mixed solution is formed by mixing oxalic acid solution with the mass concentration of 20% and ammonium metavanadate solution with the mass concentration of 30% according to the mass ratio of 1:1, stirring and mixing for 2 hours, then adding liquid silica gel, and continuously stirring for 1 hour to obtain primary slurry with the solid content of 30%; wherein the addition amounts of titanium dioxide, oxalic acid-ammonium metavanadate mixed solution, ammonium heptamolybdate and liquid silica gel are in accordance with the TiO loaded in the low-temperature denitration catalyst2、V2O5、MoO3、SiO2Calculating the ratio of (A) to (B);
(b) grinding the primary slurry by a sand mill to obtain catalyst slurry with the particle size DN90 less than 4 mu m;
(c) according to the load calculation of the active components in the low-temperature denitration catalyst, coating the catalyst slurry on a carrier through coating equipment, and blowing the slurry remained on the wall of the carrier by using compressed air to obtain a primary catalyst product;
(d) calcining the primary catalyst product at 550 ℃ for 5h, cooling, soaking in a phosphoric acid solution with the concentration of 0.5mol/L for 3min, and drying at 80 ℃ for 3h to obtain a finished product, wherein the addition amount of phosphoric acid is calculated according to the load amount of phosphate ions in the low-temperature denitration catalyst.
Example 9
The low-temperature denitration catalyst comprises a cordierite carrier and an active component coated on the carrier, wherein the loading capacity of the active component is 1.2 wt%; the active component comprises 9 wt% of V2O53.8 wt% MoO 34% by weight of SiO281.7 wt% of TiO2And 1.5 wt% of phosphate ions, and the loading amount of the vanadium element in the active component in the low-temperature denitration catalyst is 6.05 wt%.
The preparation method of the low-temperature denitration catalyst comprises the following steps:
(a) adding deionized water into a stirring device, adding titanium dioxide while stirring, then adding oxalic acid-ammonium metavanadate mixed solution and ammonium heptamolybdate, wherein the oxalic acid-ammonium metavanadate mixed solution is formed by mixing oxalic acid solution with the mass concentration of 20% and ammonium metavanadate solution with the mass concentration of 30% according to the mass ratio of 1:1, stirring and mixing for 2.5h, then adding liquid silica gel, and continuously stirring for 1h to obtain initial slurry with the solid content of 20%; wherein the addition amounts of titanium dioxide, oxalic acid-ammonium metavanadate mixed solution, ammonium heptamolybdate and liquid silica gel are in accordance with the TiO loaded in the low-temperature denitration catalyst2、V2O5、MoO3、SiO2Calculating the ratio of (A) to (B);
(b) grinding the primary slurry by a sand mill to obtain catalyst slurry with the particle size DN90 less than 4 mu m;
(c) according to the load calculation of the active components in the low-temperature denitration catalyst, coating the catalyst slurry on a carrier through coating equipment, and blowing the slurry remained on the wall of the carrier by adopting compressed air to obtain a catalyst primary product;
(d) calcining the primary catalyst product at 500 ℃ for 6h, cooling, soaking in a phosphoric acid solution with the concentration of 0.5mol/L for 2min, and drying at 85 ℃ for 4h to obtain a finished product, wherein the addition amount of phosphoric acid is calculated according to the loading amount of phosphate ions in the low-temperature denitration catalyst.
Example 10
A low-temperature denitration catalyst comprises a cordierite carrier and an active component coated on the carrier, wherein the loading amount of the active component is 1.3 wt%; the active component comprises 10.7 wt% of V2O511 wt% of MoO33.7% by weight of SiO274.1 wt% of TiO2And 0.5 wt% of phosphate ions, and the supported amount of the vanadium element in the active component in the low-temperature denitration catalyst is 7.79 wt%.
The preparation method of the low-temperature denitration catalyst comprises the following steps:
(a) adding deionized water into a stirring device, adding titanium dioxide while stirring, then adding oxalic acid-ammonium metavanadate mixed solution and ammonium heptamolybdate, wherein the oxalic acid-ammonium metavanadate mixed solution is formed by mixing oxalic acid solution with the mass concentration of 20% and ammonium metavanadate solution with the mass concentration of 30% according to the mass ratio of 1:1, adding liquid silica gel after stirring and mixing for 3 hours, and continuously stirring for 0.5 hour to obtain initial slurry with the solid content of 25%; wherein the addition amounts of titanium dioxide, oxalic acid-ammonium metavanadate mixed solution, ammonium heptamolybdate and liquid silica gel are according to the TiO loaded in the low-temperature denitration catalyst2、V2O5、MoO3、SiO2Calculating the ratio of (A) to (B);
(b) grinding the primary slurry by a sand mill to obtain catalyst slurry with the particle size DN90 less than 4 μm;
(c) according to the load calculation of the active components in the low-temperature denitration catalyst, coating the catalyst slurry on a carrier through coating equipment, and blowing the slurry remained on the wall of the carrier by adopting compressed air to obtain a catalyst primary product;
(d) calcining the primary catalyst product at 650 ℃ for 4h, cooling, immersing in a phosphoric acid solution with the concentration of 0.5mol/L for 3min, and drying at 75 ℃ for 3h to obtain a finished product, wherein the addition amount of phosphoric acid is calculated according to the loading amount of phosphate ions in the low-temperature denitration catalyst.
Comparative examples 1 to 10
The low-temperature denitration catalyst is prepared according to the proportion and the preparation method of the embodiment 1-10 respectively, and the difference is that a stirring device in the prior art is adopted for stirring.
Comparative examples 11 to 20
The low-temperature denitration catalyst is prepared according to the mixture ratio and the preparation method of the embodiments 1-10 respectively, and the difference is that the phosphoric acid impregnation process in the step (d) is omitted, and the catalyst primary product is directly calcined.
The low-temperature denitration activity tests are carried out on the low-temperature denitration catalysts prepared in the examples 1-10, the comparative examples 1-10 and the comparative examples 11-20 at the temperature of 200 ℃ in sulfur-containing flue gas, and the results are shown in table 1. The structure shows that the denitration performance of the low-temperature denitration catalyst prepared by the method is higher than that of the low-temperature denitration catalyst prepared by the comparative example, and the stirring device can improve the low-temperature catalytic activity; the low-temperature denitration catalyst loaded with phosphate ions has better sulfur resistance.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (6)
1. The utility model provides an agitating unit for preparing low temperature denitration catalyst, includes jar body (1), rotatable main shaft (2), first stirring rake (3) that a pair of symmetry set up, second stirring rake (4) of circumference equipartition, its characterized in that: first gear (21) and second gear (22) are fixedly arranged on main shaft (2), gear ring (11) and annular fixed plate (6) are fixedly arranged on the inner wall of the upper portion of tank body (1), second stirring paddle (4) is simultaneously in meshed transmission with first gear (21) and gear ring (11) through fourth gear (42), support (5) is fixedly arranged in tank body (1), support (5) comprises disc-shaped mounting portion (51), annular outer wall of mounting portion (51) and annular inner wall of fixed plate (6) form annular through hole (8), annular connecting piece (7) is arranged above through hole (8), annular connecting piece (7) is simultaneously in sliding connection with mounting portion (51) and fixed plate (6), second stirring paddle (4) passes through connecting piece (7) and through hole (8) and second stirring paddle (4) is rotationally connected with connecting piece (7), the first stirring paddle (3) is in meshed transmission connection with the second gear (22) through a third gear (32).
2. The stirring apparatus for preparing a low-temperature denitration catalyst according to claim 1, wherein: fourth gears (42) are distributed on the periphery of the first gear (21), the second stirring paddle (4) comprises a second shaft lever (41), the second shaft lever (41) is fixedly arranged on the fourth gears (42) in a penetrating mode, the second shaft lever (41) penetrates through the connecting piece (7) and the through hole (8), and the second shaft lever (41) is connected with the connecting piece (7) in a rotating mode.
3. The stirring apparatus for preparing a low-temperature denitration catalyst according to claim 1, wherein: be equipped with annular first slide rail (61) on fixed plate (6), be equipped with annular second slide rail (53) on installation department (51), slidable mounting annular connecting piece (7) on first slide rail (61) and second slide rail (53).
4. The stirring device for preparing a low-temperature denitration catalyst as set forth in claim 1, wherein: the main shaft (2) is rotatably arranged between the top of the tank body (1) and the mounting part (51).
5. The stirring apparatus for preparing a low-temperature denitration catalyst according to claim 1, wherein: the first stirring paddle (3) comprises a first shaft rod (31), the third gear (32) is fixed on the first shaft rod (31), and the first shaft rod (31) penetrates through the mounting part (51) and is rotatably connected with the mounting part (51).
6. The stirring apparatus for preparing a low-temperature denitration catalyst according to claim 1, wherein: the support (5) comprises a vertical column (52) vertical to the mounting part (51), and the vertical column (52) is fixedly connected with the bottom of the tank body (1).
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| CN117504857A (en) * | 2023-10-30 | 2024-02-06 | 浙江德创环保科技股份有限公司 | Preparation method of catalyst suitable for CO catalytic combustion treatment of steel sintering flue gas |
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| CN207119308U (en) * | 2017-09-01 | 2018-03-20 | 苏州沣镐环保科技有限公司 | A kind of carton production stirring paste producing device |
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