CN115121047A - Preparation method of modified ceramic filter element - Google Patents
Preparation method of modified ceramic filter element Download PDFInfo
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- CN115121047A CN115121047A CN202210271528.7A CN202210271528A CN115121047A CN 115121047 A CN115121047 A CN 115121047A CN 202210271528 A CN202210271528 A CN 202210271528A CN 115121047 A CN115121047 A CN 115121047A
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- denitration catalyst
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- 239000000919 ceramic Substances 0.000 title claims abstract description 117
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000003054 catalyst Substances 0.000 claims abstract description 70
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 12
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 12
- 238000005245 sintering Methods 0.000 claims abstract description 9
- 239000011230 binding agent Substances 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 30
- 239000003814 drug Substances 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 20
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 19
- 238000002791 soaking Methods 0.000 claims description 17
- 238000001035 drying Methods 0.000 claims description 16
- 239000007787 solid Substances 0.000 claims description 11
- 239000000835 fiber Substances 0.000 claims description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000007598 dipping method Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 229910001415 sodium ion Inorganic materials 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 9
- 210000004127 vitreous body Anatomy 0.000 abstract description 4
- 229910052783 alkali metal Inorganic materials 0.000 abstract description 3
- 150000001340 alkali metals Chemical class 0.000 abstract description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 abstract description 2
- 238000010494 dissociation reaction Methods 0.000 abstract description 2
- 230000005593 dissociations Effects 0.000 abstract description 2
- 238000000746 purification Methods 0.000 abstract description 2
- 229910052708 sodium Inorganic materials 0.000 abstract description 2
- 239000011734 sodium Substances 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 239000000428 dust Substances 0.000 description 10
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 239000008367 deionised water Substances 0.000 description 5
- 229910021641 deionized water Inorganic materials 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 3
- 229940115440 aluminum sodium silicate Drugs 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- UNTBPXHCXVWYOI-UHFFFAOYSA-O azanium;oxido(dioxo)vanadium Chemical compound [NH4+].[O-][V](=O)=O UNTBPXHCXVWYOI-UHFFFAOYSA-O 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 235000006408 oxalic acid Nutrition 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 229910003439 heavy metal oxide Inorganic materials 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- MIVBAHRSNUNMPP-UHFFFAOYSA-N manganese(2+);dinitrate Chemical compound [Mn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O MIVBAHRSNUNMPP-UHFFFAOYSA-N 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000011272 standard treatment Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004056 waste incineration Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
- B01D39/2068—Other inorganic materials, e.g. ceramics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/24—Chromium, molybdenum or tungsten
- B01J23/30—Tungsten
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/32—Manganese, technetium or rhenium
- B01J23/34—Manganese
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/02—Sulfur, selenium or tellurium; Compounds thereof
- B01J27/057—Selenium or tellurium; Compounds thereof
- B01J27/0573—Selenium; Compounds thereof
Abstract
The invention belongs to the field of purification equipment, and particularly relates to a preparation method of a modified ceramic filter element. According to the scheme, sodium silicate is used as a binder, a certain amount of alkali metal sodium is arranged on the filter element, the alkaline ceramic filter element is subjected to high-temperature sintering treatment to form a vitreous body, sodium ions are solidified in the vitreous body, so that the possibility of dissociation is avoided, and the influence of the sodium ions on the activity of the denitration catalyst is avoided. The modified ceramic filter element prepared by the scheme of the invention not only greatly improves the flexural strength and prolongs the service life of the filter element, but also has lower resistance and more stable denitration catalyst.
Description
Technical Field
The invention belongs to the field of purification equipment, and particularly relates to a preparation method of a modified ceramic filter element.
Background
In recent years, large-scale haze weather continuously appears in most areas of China, serious harm is caused to human health, and the weather becomes a social focus, a hotspot and a serious civil problem. The main reason for haze formation is that the concentration of PM2.5 in the air is too high, and sulfur dioxide, nitrogen oxides, smoke dust and the like are the main pollutants for forming PM2.5 in the air. Therefore, the development of denitration and dust removal technologies in the industries of thermal power, steel, glass, ceramics, cement, color, petrifaction, chemical industry, waste incineration and the like is accelerated.
At present, the Selective Catalytic Reduction (SCR) has the characteristics of high efficiency, practicality and economy, and has become a research hotspot and a key technology for removing nitrogen oxides. The core of the SCR technology is the preparation of a catalyst with high efficiency, high activity and long service life.
The conventional SCR denitration process adopts porous catalyst denitration- → dust removal- → desulfurization- → flue gas discharge, and the process has the defects of large floor area, high investment and the like and is complex to operate; in the denitration link, dust enters the porous catalyst along with flue gas, so that catalyst blockage and passivation of alkali metal on the catalyst are easily caused, the service efficiency and service life of the catalyst are reduced, and the use cost of denitration is increased. And the denitration is carried out after the dust is filtered by adopting a conventional high-temperature-resistant cloth bag, the flue gas temperature is not higher than 250 ℃, and the denitration efficiency is further reduced.
And adopt the ceramic filter core of laying denitration catalyst of resistant higher temperature to carry out dust filtration and SCR denitration, realize dust removal, denitration, desulfurization integration, not only reduced the investment, area is little, easy operation, working costs are low moreover. And the ceramic filter element is laid with the denitration catalyst and is the key of the technology.
At present, the base material for laying the denitration catalyst on the ceramic filter element in the market is mainly formed by shearing aluminum silicate fibers into a certain length and then adding silica sol to prepare slurry, and after the denitration catalyst is laid, the denitration efficiency is higher through vacuum suction filtration forming. However, such ceramic filter elements have a great problem of low flexural strength, generally not exceeding 1 MPa. In the practical application process, the links of transportation, loading and unloading, transportation and the like are slightly collided, so that the filter element can be damaged; in the use process, as the resistance of the dust filtering surface is increased, dust is removed in a compressed air back blowing mode to reduce the filtering resistance, the normal operation is maintained, the filter element can bear certain compressed air impact force, the filter element is broken and damaged due to long-term washing, and the smoke emission exceeds the standard; when the fracture occurs, the system must be stopped to replace the filter element, and the normal production is directly influenced; meanwhile, the ceramic filter element has relatively high resistance, the clearance resistance is generally over 300Pam/min, the clearance resistance reaches 800Pam/min after the catalyst is laid, and the energy consumption is huge when the ceramic filter element is used; because this filter core body rigidity is lower, the denitration catalyst who lays under compressed air scouring drops easily, leads to filter core performance to reduce, life shortens.
Disclosure of Invention
The invention aims to provide a preparation method of a modified ceramic filter element, the breaking strength of the prepared ceramic filter element is greatly improved, and the laid denitration catalyst is more stable.
In order to achieve the purpose, the invention adopts the technical scheme that: the preparation method of the modified ceramic filter element comprises the steps of preparing an alkaline ceramic filter element by taking alumina fibers as aggregates and sodium silicate as a binder, and then sequentially carrying out high-temperature sintering, silica sol soaking and denitration catalyst laying on the alkaline ceramic filter element to obtain the modified ceramic filter element.
According to the scheme, the ceramic filter element substrate prepared by adopting the alumina fiber and the sodium silicate as raw materials is alkaline, compared with a traditional neutral substrate ceramic filter element, the filter performance is excellent, and the breaking strength is much higher, however, the sodium silicate is adopted as a binder in the scheme, a certain amount of alkali metal sodium is arranged on the filter element (so that the filter element is called as an alkaline ceramic filter element), partial sodium ions separated out when the denitration catalyst is laid react with main active substances during denitration, so that the activity is reduced, and the denitration efficiency is very low (< 45%), so that the alkaline ceramic filter element is sintered at a high temperature to form a glass body, the sodium ions are solidified in the glass body, the possibility of dissociation of the sodium ions is avoided, and the influence of the sodium ions on the activity of the denitration catalyst is avoided. The modified ceramic filter element prepared by the scheme of the invention not only greatly improves the flexural strength and prolongs the service life of the filter element, but also has lower resistance and more stable denitration catalyst.
The preparation method of the modified ceramic filter element specifically comprises the following steps:
(1) preparing a base material: taking alumina fiber as aggregate and sodium silicate as binder, and sintering and molding at 800-850 ℃ to prepare the alkaline ceramic filter element; preferably 830 deg.c. The porosity of the alkaline ceramic filter element is 70-80%, and the average pore diameter of the film layer is 1-10 um; the ceramic filter element is soaked in water, the water solution is alkaline, and the pH value is 8-11. The flexural strength versus temperature relationship is shown in FIG. 1.
(2) And (3) high-temperature sintering: heating the alkaline ceramic filter element obtained in the step (1) to 900-950 ℃, and preserving heat for 1-2 hours, preferably for 1 hour at 920 ℃; and (6) cooling. As can be seen from fig. 1, the flexural strength of the alkaline ceramic filter element decreases linearly after the sintering temperature exceeds 900 ℃, and in order to ensure that the ceramic filter element has sufficient flexural strength, the alkaline ceramic filter element is melted by sodium silicate in the filter element as completely as possible, and is cooled to form a vitreous body, so that sodium ions are ensured to be solidified in the vitreous body, and no sodium ions are separated out when water solution is encountered. After the treated ceramic filter element is soaked in water, the water solution is basically neutral.
(3) Dipping silica sol: soaking the cooled ceramic filter element in a silica sol solution for 10-30 min, and then drying for 12-36 hours at the temperature of 70-90 ℃; preferably drying for 20-24 hours at the temperature of 80 ℃. The silica sol solution SiO 2 The solid content is 10-30%, and the soaking time is 5-20 min. In order to completely eliminate the possible residual sodium ions, the ceramic filter element sintered at high temperature is soaked in silica sol solution to form a layer of SiO on the surface of the porous filter element and the wall of the porous channel 2 The membrane further isolates the filter element from the denitration catalyst, and eliminates the influence of sodium ions on the catalyst. After the treated filter element is soaked in an aqueous solution at the temperature of 80 ℃ for 24 hours, the pH value of the aqueous solution is detected by a pH tester, and the pH value is ensured to be stabilized at 7.
(4) Laying a denitration catalyst: and laying a denitration catalyst on the dried ceramic filter element to obtain the modified ceramic filter element. The present invention does not require the type of denitration catalyst, and denitration catalysts such as V-W/Ti, Mn-W/Ti, Se-Mn/Ti, etc. may be supported.
The method for laying the denitration catalyst comprises the following steps: and soaking the ceramic filter element in the denitration catalyst liquid medicine, drying, and repeating the steps to obtain the ceramic filter element with the denitration catalyst laid thereon.
Firstly, soaking the ceramic filter element in the denitration catalyst liquid medicine for 10-20 min, and then drying the filter element at the temperature of 60-80 ℃ for 20-24 hours; and (5) soaking for the second time, wherein the soaking time, the drying temperature and the drying time are the same as those of the first time, and the step of laying the denitration catalyst is completed. The finished product of the porous ceramic filter element after being soaked in the denitration catalyst and dried does not need to be sintered for the second time and can be directly used.
The method for laying the denitration catalyst comprises the following steps: and soaking the ceramic filter element in the denitration catalyst liquid medicine, drying, and repeating the steps to obtain the ceramic filter element with the denitration catalyst laid thereon.
Because the denitration catalyst is prepared from raw materials such as ammonium metavanadate, ammonium metatungstate, titanium dioxide and the like, the substances are insoluble in water and have higher density, and are in a suspension state in water solution after being stirred, and the problems of precipitation, low upper content, high bottom content and the like can occur after standing for a few minutes. When the ceramic filter element is immersed in this suspension-like solution, it must be ensured that sufficient liquid penetrates into the filter element, and the filter element must therefore remain in this solution for a certain time. Through the detection, after the well-stirred denitration catalyst liquid medicine is stood for a period of time, the solid content of each high liquid medicine is detected, and the data records are shown in table 1:
table 1 detection of solid content of denitration catalyst liquid medicine
Therefore, when the ceramic filter element is directly soaked and does not rotate, the solid content distribution in the cross section is close to the distribution rule, and the solid content difference between the top surface and the bottom surface is 30-50%, so that the denitration catalyst laid on the ceramic filter element achieves the mouth angle effect, the invention adopts the following scheme:
when the ceramic filter element is immersed in the denitration catalyst liquid medicine, the circumferential rotation around the shaft core is kept, so that on one hand, the taken-off catalyst laid by the ceramic filter element is more uniform, and on the other hand, the ceramic filter element also plays a role in disturbing and homogenizing the denitration catalyst liquid medicine; the ceramic filter element keeps rotating around the circumferential direction of the shaft core after being taken out of the denitration catalyst liquid medicine, so that the catalyst is prevented from being uneven due to the fact that the liquid medicine on the ceramic filter element flows downwards, and the ceramic filter element can be suspended in the air for a period of time in a rotating state, and the flowing liquid medicine flows out as much as possible; when the ceramic filter element is dried, the ceramic filter element keeps rotating around the axis core in the initial drying stage, and the phenomenon that the catalyst is unevenly laid due to the fact that undried liquid medicine on the filter element has a downward flowing trend is avoided. In the whole process, the rotating speed of the ceramic filter element is 1-2 r/min, the ceramic filter element does not need to rotate too fast, and only the function of homogenizing the liquid medicine is achieved.
The ceramic filter element is in a motion state of continuous axial rotation in the process of laying the denitration catalyst. The denitration catalyst agent mostly contains heavy metal oxide, has high density, and the aqueous solution cannot be placed statically after being uniformly stirred, otherwise, the denitration catalyst agent is easy to precipitate, so that the concentration of the slurry at different liquid levels is different, the concentration of the upper part, the middle part and the lower part of the pipe body laid on the ceramic filter element pipe is difficult to be ensured to be uniform even though the continuous stirring is carried out, and the denitration efficiency of each part of the ceramic filter element pipe is directly different, namely, the flue gas permeating through the pipe wall of the part of the ceramic filter element pipe with the concentration of the chemical agent which does not reach the standard is not subjected to standard treatment and escapes. Therefore, the ceramic filter element pipe is placed in the liquid medicine pool and rotates in the denitration catalyst liquid medicine, so that the denitration catalyst liquid medicine can be continuously disturbed and homogenized, all parts of the pipe body of the ceramic filter element pipe are constantly positioned at all liquid level heights of the denitration catalyst liquid medicine, the denitration catalyst is ensured to be naturally and uniformly coated on the ceramic filter element pipe, and when smoke penetrates through the pipe wall of the ceramic filter element pipe, the denitration effect of all parts is uniform and standard-reaching treatment.
In actual operation, the denitration catalyst liquid medicine is placed in the liquid medicine tank, the lower end of the annular soft belt is hung on the pipe body of the ceramic filter core pipe to be treated in a winding mode, the ceramic filter core pipe is in a hanging mode according to self weight and is immersed in the denitration catalyst liquid medicine, the ceramic filter core pipe is driven to rotate on the denitration catalyst liquid medicine through the annular soft belt when the main rotating shaft rotates, the concentration of the denitration catalyst liquid medicine at each position is homogenized, and in the rotating process of the ceramic filter core pipe, the medicine applied to each position of the pipe body is quite uniform.
The modified ceramic filter element prepared by the technical scheme of the invention overcomes the defects of a ceramic filter element made of aluminum silicate fibers, has excellent filtering performance, and the dust emission concentration after filtering is lower than 1mg/Nm 3; the resistance is low and is much lower than a filter element made of aluminum silicate fibers, and the clearance resistance is less than 80 Pa/m/min; the porosity in the filter element is more than 75%, the filter element has rich pores, and the pore structure is hard and not easy to deform, is not easy to fall off when a denitration catalyst is laid, and is an ideal carrier; the filter element has high hardness and is not easy to erode and wear; the breaking strength is much higher than that of a ceramic filter element made of aluminum silicate fibers, and is generally higher than 8 MPa; the denitration efficiency is high, and the denitration efficiency is more than 90% at the temperature of 250-400 ℃. Therefore, the modified ceramic filter element prepared by the scheme of the invention is not easy to damage and long in service life, and does not need to be frequently replaced, so that the investment of environmental protection cost is greatly reduced.
Drawings
FIG. 1 is a graph of flexural strength versus temperature for a basic ceramic filter element substrate;
FIGS. 2-5 are graphs showing the relationship between flexural strength and temperature of the modified ceramic filter elements prepared in examples 1-4, respectively.
Detailed Description
The technical solution of the present invention is further described below with reference to examples.
Example 1
1) After an alkaline porous ceramic filter core made of aluminum oxide and sodium silicate is sintered and formed at 830 ℃, the breaking strength is 9.2MPa, the clearance resistance is less than 72Pa/m/min, and a denitration catalyst is directly laid:
a) preparing a denitration catalyst liquid medicine: (mass%) 5% TiO 2 1.2% ammonium metavanadate, 1% ammonium metatungstate, 1% oxalic acid, 10% silica sol (solid content 15%), 81.8% deionized water;
b) soaking for 20min for the first time;
c) drying with hot air at 80 deg.C for 24 hr;
d) soaking for the second time (the proportion is the same as that of the first time) for 20 min;
e) and drying the ceramic filter core for 24 hours by using hot air at the temperature of 80 ℃ to obtain the modified ceramic filter core.
2) The denitration detection result of the prepared modified ceramic filter element is shown in figure 2. Through trial, the best denitration efficiency of the filter element prepared by the method is not more than 46%, and the filter element has no use value.
Example 2
1) After an alkaline porous ceramic filter element made of alumina and sodium silicate is sintered and formed at 830 ℃, the breaking strength is 9.2MPa, and the clearance resistance is less than 70 Pa/m/min;
2) heating the filter element to 900 ℃, and preserving heat for 1 hour;
3) preparing a 10% silica sol (solid content is 15%) water solution (deionized water) by mass ratio, and soaking the cooled alkaline ceramic filter element in the silica sol solution for 20 min;
4) taking out the soaked filter element, and introducing hot air at 80 ℃ for drying for 24 hours;
5) laying a denitration catalyst on the dried filter element according to the steps a) to e) of the embodiment 1 to obtain the modified ceramic filter element.
6) The denitration detection result of the prepared alkaline ceramic filter element is shown in figure 3. Through probation, the denitration efficiency of the filter element exceeds 85% when the temperature is higher than 270 ℃, and the filter element has use value.
Example 3
1) After an alkaline porous ceramic filter element made of aluminum oxide and sodium silicate is sintered and molded at 830 ℃, the breaking strength is 9.2MPa, and the clearance resistance is less than 72 Pa/m/min;
2) heating the filter element to 915 ℃, and preserving heat for 2 hours;
3) preparing a 15% silica sol (solid content is 10%) water solution (deionized water) by mass ratio, and soaking the cooled alkaline ceramic filter element in the silica sol solution for 20 min;
4) taking out the soaked filter element, and introducing hot air at 80 ℃ for drying for 24 hours;
5) laying a denitration catalyst on the dried filter element according to the steps a) to e) of the embodiment 1 to obtain the modified ceramic filter element.
6) The denitration detection result of the prepared alkaline ceramic filter element is shown in figure 4. Through probation, the denitration efficiency of the filter element exceeds 90% when the temperature is higher than 250 ℃, and the filter element has a good use value.
Example 4
1) After an alkaline porous ceramic filter core made of aluminum oxide and sodium silicate is sintered and molded at 830 ℃, the flexural strength is 9.2MPa, and the clearance resistance is less than 72 Pa/m/min;
2) heating the filter element to 915 ℃, and preserving heat for 2 hours;
3) preparing a 15% silica sol (solid content is 10%) water solution (deionized water) by mass ratio, and soaking the cooled alkaline ceramic filter element in the silica sol solution for 20 min;
4) soaking the cooled ceramic filter element in the prepared solution (at normal temperature) for 20 min;
5) taking out the soaked filter element, and introducing hot air at 80 ℃ for drying for 24 hours;
6) laying a denitration catalyst on the dried filter element according to the steps a) to e) of the embodiment 1 to obtain the modified ceramic filter element. Wherein the denitration catalyst liquid medicine is: (mass%) 5% TiO 2 1.2% ammonium metavanadate, 1.0% ammonium metatungstate, 1% oxalic acid, 0.2% cerium nitrate, 0.6% manganese nitrate, 10% silica sol (solid content 15%), 81.0% deionized water.
7) The denitration detection result of the prepared alkaline ceramic filter element is shown in figure 5. Through trying out, the denitration efficiency of the filter element exceeds 85% when the temperature is over 200 ℃, exceeds 95% when the temperature is over 240 ℃, exceeds 99% when the temperature is over 280 ℃, has an obvious effect in a middle-temperature section and a very good effect in a high-temperature section, and therefore has a very good denitration effect.
Claims (10)
1. A preparation method of a modified ceramic filter element is characterized by comprising the following steps: the method comprises the steps of preparing an alkaline ceramic filter core by using alumina fibers as aggregates and sodium silicate as a binder, and then sequentially sintering the alkaline ceramic filter core at a high temperature, dipping silica sol and laying a denitration catalyst to obtain the modified ceramic filter core.
2. The method of making a modified ceramic filter element of claim 1, comprising the steps of:
(1) preparing a base material: taking alumina fiber as aggregate and sodium silicate as binder, and sintering and molding at 800-850 ℃ to prepare the alkaline ceramic filter element;
(2) and (3) high-temperature sintering: heating the alkaline ceramic filter element obtained in the step (1) to 900-950 ℃, preserving heat for 1-2 hours, and cooling;
(3) dipping silica sol: soaking the cooled ceramic filter element in a silica sol solution for 10-30 min, and then drying for 12-36 hours at the temperature of 70-90 ℃;
(4) laying a denitration catalyst: and laying a denitration catalyst on the dried ceramic filter element to obtain the modified ceramic filter element.
3. A method for preparing a modified ceramic filter element according to claim 1 or 2, characterized in that: the method for laying the denitration catalyst comprises the following steps: and soaking the ceramic filter element in the denitration catalyst liquid medicine, drying, and repeating the steps to obtain the ceramic filter element with the denitration catalyst.
4. The method of preparing a modified ceramic filter element of claim 3, wherein: and when the ceramic filter element is immersed in the denitration catalyst liquid medicine, the ceramic filter element keeps rotating around the circumferential direction of the shaft core at the rotating speed of 1-2 r/min.
5. The method of preparing a modified ceramic filter element of claim 3, wherein: the ceramic filter element is taken out of the denitration catalyst liquid medicine and then keeps rotating around the shaft core in the circumferential direction at the rotating speed of 1-2 r/min.
6. The method of preparing a modified ceramic filter element according to claim 3, wherein: when the ceramic filter element is dried, the ceramic filter element keeps rotating around the circumferential direction of the shaft core at the initial drying stage, and the rotating speed is 1-2 r/min.
7. The method of preparing a modified ceramic filter element of claim 2, wherein: in the step (1), the sintering and forming temperature is 830 ℃.
8. The method of preparing a modified ceramic filter element of claim 2, wherein: the temperature in the step (2) is 920 ℃, and the temperature is kept for 1 hour.
9. The method of preparing a modified ceramic filter element of claim 2, wherein: in the step (3), SiO is dissolved in a silica sol solution 2 The solid content is 10-30%, and the soaking time is 5-20 min.
10. The method of preparing a modified ceramic filter element according to claim 2, wherein: in the step (3), the ceramic filter element is dried for 24 hours at the temperature of 80 ℃ after being soaked in the silica sol slurry.
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