Waste gas purification composite filler and application thereof

Abstract

The invention provides waste gas purification composite filler and application thereof, and belongs to the technical field of waste gas purification materials. The composite filler comprises: 40-70% of a solid alkaline material; 10%-40% of an adsorbent; 5%-20% of an inorganic binder; 5%-10% of an organic auxiliary agent; the preparation method comprises the following steps: uniformly mixing a solid alkaline material, an adsorbent, an inorganic binder and an organic auxiliary agent according to a ratio, and preparing a composite filler through a molding process; the solid alkaline material is at least one compound of carbonate, oxide and hydroxide. The composite filler is used for purifying at least one of fluorine, chlorine, sulfur and nitrogen oxide components in the waste gas. The composite filler serves as an absorption reaction layer, can effectively absorb and react to remove hydrogen fluoride, hydrogen chloride, hydrogen sulfide, oxysulfide and nitric oxide in waste gas, post-treatment systems such as a tail end quench tower and an alkaline tower are omitted, the number of devices is reduced, the treatment process is simplified, and meanwhile the devices, pipelines and related core materials are protected.

Description

Technical Field

[0001] The present invention belongs to the technical field of waste gas purification materials, and particularly relates to a waste gas purification composite filler and its application. Background Art

[0002] Regenerative thermal oxidation (RTO) and regenerative catalytic oxidation (RCO) technologies are efficient organic waste gas treatment technologies, which achieve efficient treatment of industrial organic waste gas through three main links: waste gas collection and pretreatment, oxidation, and heat energy recovery.

[0003] When using the regenerative oxidation technology to purify organic waste gas, it is necessary to select honeycomb ceramic regenerators made of costly dense corundum materials; at the same time, for waste gas containing fluorine, it is required that the inlet concentration of fluoride ions should be less than 20 mg / m 3 , and the material grade of the metal parts in direct contact with the waste gas should not be lower than 2507 duplex stainless steel. For industrial organic waste gas containing chlorine and sulfur components, it is required that the furnace body and internal flow-through components adopt anti-corrosion coatings, and the material of the metal parts in direct contact with the waste gas should not be lower than 2205 duplex stainless steel. In addition, for the treatment of waste gas containing fluorine, chlorine, and sulfur, a post-treatment system such as a quench tower and an alkali scrubbing tower should be set at the end of the waste gas treatment. The whole set of treatment equipment is complex, the treatment process is cumbersome, the environmental protection investment and operation cost are high, and it is difficult to effectively purify the fluorine, chlorine, sulfur, and nitrogen oxide components in the waste gas, and even cause secondary pollution.

[0004] In view of this, the present invention provides a composite filler for purifying comprehensive pollutants in waste gas. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a waste gas purification composite filler and its application, aiming to solve at least one technical problem in the background art.

[0006] The present invention is implemented as follows:

[0007] The first aspect of the present invention provides a waste gas purification composite filler, and the composite filler comprises the following components in weight percentage:

[0008] Solid basic material 40%-70%;

[0009] Adsorbent 10%-40%;

[0010] Inorganic binder 5%-20%;

[0011] Organic auxiliary 5%-10%;

[0012] The preparation method of the composite filler is: mixing the solid basic material, adsorbent, inorganic binder, and organic auxiliary in proportion and uniformly, and then obtaining the composite filler through a forming process;

[0013] Among them, the solid basic material is at least one of carbonate, oxide, and hydroxide.

[0014] Preferably, the solid basic material is an alkaline metal compound;

[0015] The metal is selected from potassium, sodium, calcium, magnesium, or aluminum.

[0016] Preferably, the adsorbent is at least one of pseudoboehmite, γ-aluminum oxide, zeolite molecular sieve, activated carbon, attapulgite, activated clay, bentonite, silica gel, and organic adsorption resin.

[0017] Preferably, the inorganic binder is at least one of clay, silica sol, aluminum sol, and aluminum phosphate glue.

[0018] Preferably, the organic auxiliary is at least one of methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose, and dextrin.

[0019] Preferably, the forming process adopts any one of plastic extrusion forming, molding, casting, dry pressing, and pelletizing.

[0020] Preferably, the composite filler is a particulate filler, spherical filler, strip filler, or honeycomb filler.

[0021] Preferably, the shape of the composite filler is saddle-shaped, circular ring-shaped, figure-eight-shaped, pineapple spherical, clover-shaped, hollow spherical, or multi-angle ring-shaped.

[0022] The second aspect of the present invention provides the application of the above-mentioned waste gas purification composite filler, and the composite filler is used to purify at least one of the components of fluorine, chlorine, sulfur, and nitrogen oxides in waste gas.

[0023] Preferably, the composite filler is filled into a regenerative thermal oxidizer (RTO) device or a regenerative catalytic oxidizer (RCO) device.

[0024] In the regenerative thermal oxidizer device, the filling method of the composite filler is as follows:

[0025] S1. Before filling, thoroughly clean the regenerative chamber of the RTO device or RCO device, remove any impurities and residues, and check the tightness and structural integrity of the regenerative chamber to ensure no leakage and damage;

[0026] S2. Fill the composite filler into the lower part of the regenerative chamber, and the filling height is set to 100 mm to 1000 mm according to needs to form a regenerator;

[0027] S3. Plan the layout and filling sequence of the ceramic regenerator, and determine parameters such as the arrangement mode, spacing, and number of layers of the ceramic regenerator to ensure good heat transfer and heat storage.

[0028] S4. Adopt a layer-by-layer filling method to evenly arrange the ceramic regenerators in the heat storage chamber of the RTO device or RCO device, and keep the spacing between the regenerators consistent.

[0029] In the RCO device, a catalytic layer is also installed in the heat storage chamber, and the catalytic layer is arranged above the ceramic regenerator.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The composite filler of the present invention serves as an absorption reaction layer. When treating waste gas containing components such as H + , F, Cl, S, and NOx, it can effectively absorb and react to remove hydrogen fluoride, hydrogen chloride, hydrogen sulfide, sulfur oxides, and nitrogen oxides in the waste gas, eliminating the need for post-treatment systems such as an end quench tower and an alkali scrubber, reducing the number of equipment, simplifying the treatment process, and protecting the equipment, pipelines, and related core materials at the same time.

[0032] 2. By adding the composite filler in the RTO and RCO devices of the present invention, hydrogen fluoride, hydrogen chloride, hydrogen sulfide, sulfur oxides, and nitrogen oxides in the waste gas enter the RTO and RCO devices after being absorbed by the reactive inorganic filler, greatly reducing the corrosion of the waste gas to core materials such as regenerators, catalysts, and adsorbents, as well as the interior of the equipment and pipelines, prolonging the service life of the equipment, reducing the investment and operation cost of environmental protection equipment, and improving the operation safety of the system.

[0033] 3. For the fluorine-containing organic waste gas, the composite filler of the present invention can recover high-value fluorine-containing compounds from the reactive inorganic filler in an appropriate manner, realizing the efficient treatment of fluorine-containing organic waste gas and promoting the recycling and reuse of resources.

[0034] 4. The composite filler of the present invention is arranged in the equipment in the form of particles, honeycombs, dumped packings, or other structural shapes, and can replace the gas distribution layer to achieve uniform distribution of the waste gas in the equipment, simplifying the equipment structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a filling schematic diagram of the composite filler of the present invention in the RTO device;

[0036] Figure 2 It is a filling schematic diagram of the composite filler of the present invention in the RCO device.

[0037] Illustration: 1-Regenerative thermal oxidation equipment; 2-Heat storage chamber; 3-Combustion chamber; 21-Ceramic regenerator; 22-Composite filler; 23-Catalytic layer. Detailed Embodiments

[0038] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] An exhaust gas purification composite filler, which comprises components in the following weight percentages:

[0040] Solid basic material 40%-70%; an alkaline metal compound is used, specifically at least one of carbonate (such as normal carbonate, bicarbonate), oxide, and hydroxide, preferably carbonate; the metal element in the compound is selected from potassium, sodium, calcium, magnesium or aluminum;

[0041] Adsorbent 10%-40%; it is selected from at least one of pseudoboehmite, γ-aluminum oxide, zeolite molecular sieve, activated carbon, attapulgite, activated clay, bentonite, silica gel, and organic adsorption resin;

[0042] Inorganic binder 5%-20%; it is selected from at least one of clay, silica sol, aluminum sol, and aluminum phosphate glue;

[0043] Organic auxiliary 5%-10%; it is selected from at least one of methyl cellulose (MC), hydroxypropyl methyl cellulose (HPMC), hydroxyethyl cellulose (HEC), and dextrin.

[0044] The preparation method of the composite filler is as follows: after uniformly mixing the solid basic material, adsorbent, inorganic binder, and organic auxiliary in proportion, the composite filler is obtained through a forming process (such as plastic extrusion forming, molding, casting molding, dry pressing molding, pelletizing molding). The composite filler is in the shape of a granular filler, spherical filler, strip filler, honeycomb filler or a similar bulk packing structure, for example: saddle shape, circular ring shape, "8" shape, pineapple spherical shape, clover shape, hollow spherical shape, triangular or octagonal multi-angle ring shape.

[0045] In specific implementation, during the preparation process, first, ensure that all raw materials meet the specified quality standards, are free of impurity pollution, and are accurately weighed according to the formula. Then, using a high-efficiency mixing device, under appropriate temperature, humidity and stirring speed, the components are fully mixed evenly; in addition, solvents, dispersants, etc. can also be added during the mixing process to improve the mixing effect and ensure that there is no obvious agglomeration phenomenon between the components.

[0046] Before the composite filler is formed and processed, the raw materials can be pretreated according to actual needs. For example: (1) For powder materials that are not easily formed directly, granulation treatment can be carried out first to improve their fluidity; (2) For products that require higher density, pre-pressing treatment can be carried out first to initially form a green body with a certain strength. In addition, according to the needs of the forming process, adjust the moisture content or solvent ratio of the mixture to ensure that there is sufficient wettability during the forming process to promote the bonding between particles, and at the same time avoid excessive liquid causing deformation or cracking of the formed body.

[0047] During the forming and processing of the composite filler, targeted auxiliary treatment can be carried out according to the forming process. For example: (1) For forming processes that require molds such as molding, casting, and dry pressing, prepare corresponding molds according to the product shape, apply an appropriate amount of mold release agent to prevent adhesion, put the uniformly mixed material into the mold, and apply pressure through equipment such as a hydraulic press or a mechanical press to densify and form the material in the mold. During the pressing process, parameters such as the pressure magnitude, holding time, and pressing speed need to be controlled. After the forming is completed, place the formed body in a drying equipment to remove excess moisture or solvent to improve its strength and stability; (2) When forming pellets, select equipment suitable for pellet forming, such as a rotary pelletizer, a vibrating pelletizer, etc., send the uniformly mixed material into the pelletizer, and make the material particles collide, bond, and gradually form a spherical shape through mechanical vibration or rotation. During the pelletizing process, parameters such as the material flow rate, pelletizing speed, and humidity need to be controlled.

[0048] In addition, for formed bodies that need to further improve their performance, sintering or curing treatment can be carried out to cause chemical reactions or physical bonding between components through high-temperature action to form a denser and more stable structure.

[0049] The above-mentioned waste gas purification composite filler of the present invention can be used to purify at least one of the components of fluorine, chlorine, sulfur, and nitrogen oxides in waste gas. Specifically, the composite filler is filled into a regenerative thermal oxidizer (RTO) device or a regenerative catalytic oxidizer (RCO) device.

[0050] In the RTO device or the RCO device, the filling method of the composite filler is as follows:

[0051] S1. Before filling, thoroughly clean the regenerator of the RTO device or the RCO device, remove any impurities and residues, and check the tightness and structural integrity of the regenerator to ensure no leakage and damage;

[0052] S2. Fill the composite filler into the lower part of the regenerator, and set the filling height to 100 mm - 1000 mm according to needs to form a regenerator;

[0053] S3. Plan the layout and filling sequence of the ceramic regenerator, and determine parameters such as the arrangement mode, spacing, and number of layers of the ceramic regenerator to ensure good heat transfer and heat storage.

[0054] S4. Adopt a layer-by-layer filling method to evenly arrange the ceramic regenerators in the heat storage chamber of the RTO device or RCO device, and keep the spacing between the regenerators consistent.

[0055] In the RCO device, a catalytic layer is also installed in the heat storage chamber, and the catalytic layer is arranged above the ceramic regenerator.

[0056] Example 1

[0057] Weigh the raw materials according to the components and weight percentages in Table 1, mix, sieve, knead, extrude, and fire to prepare a honeycomb composite filler 22 with dimensions of 150 mm × 150 mm × 150 mm.

[0058] Refer to Figure 1 , and use this composite filler 22 in the RTO device. It is filled into the regenerative thermal oxidation device 1, and the regenerative thermal oxidation device 1 includes a heat storage chamber 2 and a combustion chamber 3 located above the heat storage chamber 2. The filling position of the composite filler 22 is the lower part of the heat storage chamber 2. The specific filling steps are as follows:

[0059] S1. Before filling, thoroughly clean the heat storage chamber 2 of the regenerative thermal oxidation device 1, remove any impurities and residues, and check the tightness and structural integrity of the heat storage chamber to ensure no leakage and damage.

[0060] S2. Fill the honeycomb composite filler 22 into the lower part of the heat storage chamber 2 of the regenerative thermal oxidation device 1, and set the filling height to 500 mm as required.

[0061] S3. Plan the layout and filling sequence of the ceramic regenerator 21, and determine parameters such as the arrangement mode, spacing, and number of layers of the ceramic regenerator 21 to ensure good heat transfer and heat storage.

[0062] S4. Adopt a layer-by-layer filling method to evenly arrange the ceramic regenerators 21 in the heat storage chamber 2, and keep the spacing between the ceramic regenerators 21 consistent.

[0063] Simulate the absorption and removal of HF, HCl, H2S, and NOx components in the waste gas by the composite fillers 22 in each group in Example 1, and keep the temperature and flow rate of the waste gas in each group consistent during the simulation. The concentration ranges of HF, HCl, H2S, and NO x components in the waste gas are 100 ppm - 1000 ppm (see Table 2 for details), and the removal rates of each component in the waste gas are shown in Table 3.

[0064] Table 1

[0065]

[0066] Table 2

[0067] Component HF Concentration / ppm HCl Concentration / ppm <![CDATA[H2S concentration / ppm]]> <![CDATA[NO x Concentration / ppm <!-- 4 -->]]> Exhaust Gas 200 300 500 1000

[0068] Table 3

[0069] Group HF Removal Rate % HCl Removal Rate % <![CDATA[H2S removal rate %]]> <![CDATA[NO x Removal rate %]]> Group 1-1 80 88 84 78 Group 1-2 80 90 85 78 Group 1-3 85 92 86 80 Group 1-4 89 95 88 82

[0070] As can be seen from the data in Table 4, after the composite filler of this embodiment is filled into the RTO device and the waste gas is purified, the removal rate of HF is 80% - 89%, the removal rate of HCl is 88% - 95%, the removal rate of H2S is 84% - 88%, and the removal rate of NO x is 78% - 82%.

[0071] Example 2

[0072] Weigh the raw materials according to the components and weight percentages in Table 4, mix, sieve, knead, extrude, and fire to prepare a composite filler 22 with a size of 0.5 inches to 3 inches, and its shape is saddle-ring; fill the composite filler into the regenerative thermal oxidation device 1, and the method is the same as that in Example 1.

[0073] Simulate the absorption and removal of HF, HCl, H2S, and NOx components in the waste gas by the composite fillers 22 in each group in Example 2, and keep the temperature and flow rate of the waste gas in each group consistent during the simulation. The concentration range of HF, HCl, H2S, and NO x components is 100 ppm - 1000 ppm (see Table 2 for details), and the removal rates of each component in the waste gas are shown in Table 5.

[0074] Table 4

[0075]

[0076] Table 5

[0077] Group HF Removal Rate % HCl Removal Rate % <![CDATA[H2S removal rate %]]> <![CDATA[NO x Removal rate %]]> Group 2-1 88 85 74 75 Group 2-2 89 85 75 77 Group 2-3 92 89 80 80 Group 2-4 94 89 84 80

[0078] As can be seen from the data in Table 5, after the composite filler of this embodiment is filled into the RTO device and the waste gas is purified, the removal rate of HF is 88% - 94%, the removal rate of HCl is 85% - 89%, the removal rate of H2S is 74% - 84%, and the removal rate of NO x is 75% - 80%.

[0079] Example 3

[0080] Weigh the raw materials according to the components and weight percentages in Table 6, mix, sieve, knead, extrude, and fire to prepare a honeycomb composite filler 22 with dimensions of 150 mm × 150 mm × 150 mm; load the composite filler into the regenerative thermal oxidation device 1 in the same manner as in Example 1.

[0081] Simulate the absorption and removal of HF, HCl, H2S, and NOx components in the waste gas by the composite filler 22 in each group in Example 3, and keep the temperature and flow rate of the waste gas in each group consistent during the simulation. The concentration ranges of HF, HCl, H2S, and NO x in the waste gas are 100 ppm - 1000 ppm (see Table 2 for details), and the removal rates of each component in the waste gas are shown in Table 7.

[0082] Table 6

[0083]

[0084] Table 7

[0085] Group HF Removal Rate % HCl Removal Rate % <![CDATA[H2S removal rate %]]> <![CDATA[NO x Removal rate %]]> Group 3-1 84 88 75 70 Group 3-2 85 92 77 70 Group 3-3 88 92 80 72 Group 3-4 89 94 82 75

[0086] It can be seen from the data in Table 7 that after the composite filler of this example is loaded into the RTO device and the waste gas is purified, the removal rate of HF is 84% - 89%, the removal rate of HCl is 88% - 94%, the removal rate of H2S is 75% - 82%, and NO x the removal rate is 70% - 75%.

[0087] Example 4

[0088] Weigh the raw materials according to the components and weight percentages in Table 8, mix, sieve, knead, extrude, and fire to prepare a circular granular composite filler 22 with dimensions of mix, sieve, knead, extrude, and fire; load the composite filler into the regenerative thermal oxidation device 1 in the same manner as in Example 1.

[0089] Simulate the absorption and removal of HF, HCl, H2S, and NOx components in the waste gas by the composite filler 22 in each group in Example 4, and keep the temperature and flow rate of the waste gas in each group consistent during the simulation. The concentration ranges of HF, HCl, H2S, and NO x in the waste gas are 100 ppm - 1000 ppm (see Table 2 for details), and the removal rates of each component in the waste gas are shown in Table 9.

[0090] Table 8

[0091]

[0092] Table 9

[0093] Group HF Removal Rate % HCl Removal Rate % <![CDATA[H2S removal rate %]]> <![CDATA[NO x Removal rate %]]> Group 4-1 90 95 82 78 Group 4-2 92 97 85 80 Group 4-3 92 97 85 82 Group 4-4 94 98 88 84

[0094] As can be seen from the data in Table 9, after the composite filler of this embodiment is filled into the regenerative oxidation equipment and the waste gas is purified, the removal rate of HF is 90% - 94%, the removal rate of HCl is 95% - 98%, the removal rate of H2S is 82% - 88%, and the removal rate of NO x is 78% - 84%.

[0095] Example 5

[0096] Weigh the raw materials according to the components and weight percentages in Table 10, and prepare the composite filler 22 in the shape of hollow spherical particles with the size prepared by mixing, sieving, kneading, extruding and firing; fill the composite filler into the regenerative oxidation equipment 1, and the method is the same as that in Example 1. Simulate the absorption and removal of HF, HCl, H2S and NOx components in the waste gas by the composite filler 22 in each group in Example 5, and keep the temperature and flow rate of the waste gas in each group consistent during the simulation. The concentration range of HF, HCl, H2S and NO

[0097] components in the waste gas is 100 ppm - 1000 ppm (see Table 2 for details), and the removal rates of each component in the waste gas are shown in Table 11. x The concentration range of HF, HCl, H2S and NO components in the waste gas is 100 ppm - 1000 ppm (see Table 2 for details), and the removal rates of each component in the waste gas are shown in Table 11.

[0098] Table 10

[0099]

[0100]

[0101] Table 11

[0102] Group HF Removal Rate % HCl Removal Rate % <![CDATA[H2S removal rate %]]> <![CDATA[NO x Removal rate % <!-- 7 -->]]> Group 5-1 85 90 80 75 Group 5-2 89 90 82 78 Group 5-3 89 92 82 80 Group 5-4 90 94 84 82

[0103] As can be seen from the data in Table 11, after the composite filler of this embodiment is filled into the RTO equipment and the waste gas is purified, the removal rate of HF is 85% - 90%, the removal rate of HCl is 90% - 94%, the removal rate of H2S is 80% - 84%, and the removal rate of NO x is 75% - 82%.

[0104] Example 6

[0105] Weigh the raw materials according to the components and weight percentages in Table 12, and prepare the composite filler 22 in the shape of octagonal ring with the size of 8mm * 9.5mm prepared by mixing, sieving, kneading, extruding and firing; fill the composite filler into the regenerative oxidation equipment 1, and the method is the same as that in Example 1.

[0106] In Simulation Example 6, the composite filler 22 in each group was used to absorb and remove the HF, HCl, H2S, and NOx components in the waste gas, while keeping the temperature and flow rate of the waste gas in each group consistent during the simulation. The concentration range of the HF, HCl, H2S, and NO x components was 100 ppm - 1000 ppm (see Table 2 for details), and the removal rates of each component in the waste gas are shown in Table 13.

[0107] Table 12

[0108]

[0109]

[0110] Table 13

[0111] Group HF Removal Rate % HCl Removal Rate % <![CDATA[H2S removal rate %]]> <![CDATA[NO x Removal rate %]]> Group 6-1 70 82 72 70 Group 6-2 72 82 72 70 Group 6-3 75 84 75 71 Group 6-4 78 85 78 72

[0112] As can be seen from the data in Table 13, after the composite filler of this example was filled into the RTO device and the waste gas was purified, the removal rate of HF was 70% - 78%, the removal rate of HCl was 82% - 85%, the removal rate of H2S was 72% - 78%, and the removal rate of NO x was 70% - 72%.

[0113] Example 7

[0114] Weigh the raw materials according to the components and weight percentages in Table 14, mix, sieve, knead, extrude, and fire to prepare a round bar-shaped composite filler 22 with a size of 3.0 mm * 9.0 mm; fill the composite filler into the regenerative thermal oxidation device 1, and the method is the same as that in Example 1.

[0115] In Simulation Example 7, the composite filler 22 in each group was used to absorb and remove the HF, HCl, H2S, and NOx components in the waste gas, while keeping the temperature and flow rate of the waste gas in each group consistent during the simulation. The concentration range of the HF, HCl, H2S, and NO x components was 100 ppm - 1000 ppm (see Table 2 for details), and the removal rates of each component in the waste gas are shown in Table 15.

[0116] Table 14

[0117]

[0118]

[0119] Table 15

[0120] Group HF Removal Rate % HCl Removal Rate % <![CDATA[H2S removal rate %]]> <![CDATA[NO x Removal rate %]]> Group 7-1 85 90 78 75 Group 7-2 85 92 80 78 Group 7-3 88 92 82 78 Group 7-4 92 95 88 82

[0121] As can be seen from the data in Table 15, after the composite filler of this embodiment is filled into the RTO device and the waste gas is purified, the removal rate of HF is 85% - 92%, the removal rate of HCl is 90% - 95%, the removal rate of H2S is 78% - 88%, and the removal rate of NO x is 75% - 82%.

[0122] Example 8

[0123] The difference between Example 8 and Example 1 is that the composite filler prepared in Example 1 is filled into the catalytic oxidation device. As shown in Figure 2 , the composite filler 22 is filled into the regenerative thermal oxidation device 1. The regenerative thermal oxidation device 1 includes a regenerative chamber 2 and a combustion chamber 3 located above the regenerative chamber 2. The filling position of the composite filler 22 is the lower part of the regenerative chamber 2. The steps are as follows:

[0124] S1. Before filling, thoroughly clean the regenerative chamber 2 of the regenerative thermal oxidation device 1 to remove any impurities and residues, and check the sealing performance and structural integrity of the regenerative chamber to ensure no leakage and damage;

[0125] S2. Fill the honeycomb composite filler 22 into the lower part of the regenerative chamber 2 of the regenerative thermal oxidation device 1, and set the filling height to 500 mm as required;

[0126] S3. Plan the layout and filling sequence of the ceramic regenerator 21, and determine parameters such as the arrangement method, spacing, and number of layers of the ceramic regenerator 21 to ensure good heat transfer and heat storage;

[0127] S4. Adopt a layer-by-layer filling method to evenly arrange the ceramic regenerator 21 in the regenerative chamber 2, and keep the spacing between the ceramic regenerators 21 consistent;

[0128] S5. Install a catalytic layer 23 above the ceramic regenerator 21. The catalytic layer 23 uses a platinum-palladium dual-loaded catalyst.

[0129] Simulate the absorption and removal of HF, HCl, H2S, and NOx components in the waste gas by the composite fillers in each group in Example 8, and keep the temperature and flow rate of the waste gas in each group consistent during the simulation. The concentration range of HF, HCl, H2S, and NO x components in the waste gas is 100 ppm - 1000 ppm (see Table 2 for details), and the removal rates of each component in the waste gas are shown in Table 16.

[0130] Table 16

[0131] Group HF Removal Rate % HCl Removal Rate % <![CDATA[H2S removal rate %]]> <![CDATA[NO x Removal rate %]]> Group 8-1 82 88 84 80 Group 8-2 82 92 85 80 Group 8-3 86 92 86 82 Group 8-4 89 95 88 82

[0132] As can be seen from the data in Table 15, after the composite filler of this embodiment is filled into the RCO device and the waste gas is purified, the removal rate of HF is 82% - 89%, the removal rate of HCl is 88% - 95%, the removal rate of H2S is 84% - 88%, and the removal rate of NO x is 80% - 82%.

[0133] Comparative Example 1

[0134] The only difference between this Comparative Example 1 and Example 1 is that the solid basic material is deleted, and the dosage of the solid basic material is all changed to adsorbent. The specific components and ratios are shown in Table 17. The other components, ratios, and filling methods are the same as those in Example 1. The removal rates of HF, HCl, H2S, and NO in the waste gas x components are shown in Table 18.

[0135] Table 17

[0136]

[0137] Table 18

[0138]

[0139]

[0140] As can be seen from the data in Table 18, after the composite filler composed of no solid basic material in this comparative example is filled into the RTO device and the waste gas is purified, the removal rate of HF is 65% - 72%, the removal rate of HCl is 72% - 80%, the removal rate of H2S is 70% - 79%, and the removal rate of NO x is 64% - 70%; their removal rates are all lower than those in Example 1.

[0141] Comparative Example 2

[0142] The only difference between this Comparative Example 2 and Example 1 is that the adsorbent is deleted, and the dosage of the adsorbent is all changed to solid basic material. The specific components and ratios are shown in Table 19. The other components, ratios, and filling methods are the same as those in Example 1. The removal rates of HF, HCl, H2S, and NO in the waste gas x components are shown in Table 20.

[0143] Table 19

[0144]

[0145] Table 20

[0146] Group HF Removal Rate % HCl Removal Rate % <![CDATA[H2S removal rate %]]> <![CDATA[NO x Removal rate %]]> Group 10-1 78 84 72 66 Group 10-2 80 88 78 68 Group 10-3 85 88 80 72 Group 10-4 88 90 84 78

[0147] As can be seen from the data in Table 20, after the composite filler composed of the adsorbent-free composition in this comparative example was filled into the RTO device and the waste gas was purified, the removal rate of HF was 78% - 88%, the removal rate of HCl was 84% - 90%, the removal rate of H2S was 72% - 84%, and the removal rate of NO x was 72% - 78%; its removal rate was lower than that of Example 1, especially the difference in the removal rates of pollutants such as hydrogen sulfide and nitrogen oxides was more obvious.

[0148] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A composite filler for waste gas purification, characterized in that: The composite filler comprises the following components in weight percentage: Solid alkaline material 40%-70%; Adsorbent 10%-40%; Inorganic binder 5%-20%; Organic additives 5%-10%; The preparation method of the composite filler is: after the solid alkaline material, the adsorbent, the inorganic binder and the organic additive are uniformly mixed in proportion, the composite filler is obtained through a molding process; Wherein, the solid alkaline material is at least one of carbonate, oxide and hydroxide.

2. The exhaust gas purification composite filler according to claim 1, characterized in that: The solid alkaline material is an alkaline metal compound; The metal is selected from potassium, sodium, calcium, magnesium or aluminum.

3. The exhaust gas purification composite filler according to claim 1, characterized in that: The adsorbent is selected from at least one of pseudo-boehmite, gamma alumina, zeolite molecular sieve, activated carbon, attapulgite, activated clay, bentonite, silica gel, and organic adsorption resin.

4. The exhaust gas purification composite filler according to claim 1, characterized in that: The inorganic binder is selected from at least one of clay, silica sol, aluminum sol and aluminum phosphate colloid.

5. The exhaust gas purification composite filler according to claim 1, characterized in that: The organic auxiliary agent is selected from at least one of methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose and dextrin.

6. The exhaust gas purification composite filler according to claim 1, characterized in that: The molding process adopts any one of plastic extrusion molding, molding, pouring molding, dry pressing molding and pellet molding.

7. The exhaust gas purification composite filler according to claim 6, characterized in that: The composite filler is a particle filler, a spherical filler, a strip filler or a honeycomb filler.

8. The exhaust gas purification composite filler according to claim 1 or 7, characterized in that: The composite filler has a saddle shape, a circular ring shape, an 8-shaped shape, a pineapple ball shape, a clover shape, a hollow sphere or a polygonal ring shape.

9. The use of a composite filler for purifying waste gas according to any one of claims 1 to 8, characterized in that: The composite filler is used to purify at least one of fluorine, chlorine, sulfur and nitrogen oxide components in exhaust gas.

10. The use of a waste gas purification composite filler according to claim 9, characterized in that: The composite filler is loaded into a regenerative thermal oxidation device or a regenerative catalytic oxidation device.

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