Industrial waste gas treatment process

Abstract

The present invention relates to the field of waste gas treatment technology, and in particular to an industrial waste gas treatment process. The treatment process uses a collector to capture sulfur-containing particles in industrial waste gas, the collector is filled in a capture tower to control the introduction speed of industrial waste gas, and the collector is composed of alkali-modified CHA type molecular sieve, alumina, and methyl cellulose. The collector composed of alkali-modified CHA type molecular sieve, alumina, and methyl cellulose provided by the present invention can adapt to complex and harsh working conditions in industrial tail gas purification treatment, and is very suitable for the purification of sulfur-containing components in industrial tail gas.

Description

Technical Field

[0001] The invention relates to the technical field of waste gas treatment, and in particular to an industrial waste gas treatment process. Background Art

[0002] At present, a variety of technologies and devices have been developed at home and abroad for the desulfurization and denitrification of industrial waste gas, especially boiler waste gas. Among them, denitrification technology includes low nitrogen combustion technology, flue gas denitrification (SNCR) technology, etc. Desulfurization technology includes: wet desulfurization technology is a double alkali method (calcium method) or magnesium oxide (magnesium method) using lime slurry and sodium hydroxide solution, and the desulfurization effect is achieved through absorption, oxidation and demisting. The disadvantages are high operating cost, serious equipment corrosion, wastewater treatment and secondary pollution; 2. Dry desulfurization technology is carried out in the furnace. Although the method is relatively simple, non-corrosive and wastewater treatment-free. However, when used on fluidized bed boilers, its desulfurization efficiency is low and the reaction speed is slow. The desulfurization technology of spraying lime powder in the boiler furnace, the method is to spray solid lime powder directly into the furnace according to the combustion characteristics of the boiler, and then it is calcined into calcium oxide at high temperature, and reacts with sulfur dioxide in the flue gas, so as to realize desulfurization in the furnace; when this method is running, the reaction temperature is not properly controlled, and the flue gas stays in the furnace for a short time, and it cannot reach the ideal state.

[0003] Currently, wet flue gas desulfurization technology is widely used. However, in existing wet flue gas desulfurization equipment, the waste gas has a short journey and residence time in the desulfurization and denitrification device, and does not react fully with the desulfurization and denitrification liquid, resulting in low desulfurization and denitrification efficiency of the waste gas, high usage of desulfurization and denitrification liquid, and high desulfurization and denitrification costs.

[0004] Based on the above situation, the present invention proposes an industrial waste gas treatment process, which can effectively solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide an industrial waste gas treatment process.

[0006] To achieve the above-mentioned purpose, the present invention provides an industrial waste gas treatment process, which uses a collector to capture sulfur-containing particles in the industrial waste gas. The collector is filled in a capture tower to control the introduction rate of the industrial waste gas. The collector is composed of an alkali-modified CHA type molecular sieve, alumina, and methyl cellulose.

[0007] Preferably, the collector is composed of the following raw materials in parts by weight: 60 to 80 parts of alkali-modified CHA molecular sieve, 120 to 140 parts of alumina, and 6 to 10 parts of methyl cellulose.

[0008] Preferably, the alkali-modified CHA molecular sieve is prepared by treating the CHA molecular sieve with a strong alkali solution.

[0009] Preferably, the strong base is sodium hydroxide or potassium hydroxide.

[0010] Preferably, the CHA type molecular sieve includes one or a combination of two or more of Fe / Cu-ZSM-5, Fe / Cu-SAPO, and Fe / Cu-SSZ-13.

[0011] Preferably, the CHA type molecular sieve is Fe / Cu-SAPO.

[0012] The preparation method of the trapping agent is:

[0013] (1) Adding Fe / Cu-SAPO molecular sieve into a pressure-resistant container filled with a strong alkali solution, sealing the system, increasing the pressure to 1.0-1.5 MPa, then increasing the temperature to 90-100° C., and treating at a constant temperature for 6-9 hours. After washing and drying, the mixture is calcined at 450-650° C. for 6-8 hours to obtain an alkali-modified CHA type molecular sieve; the concentration of the strong alkali solution is 1-2.0 mol / L; and the ratio of the amount (g) of the Fe / Cu-SAPO molecular sieve added to the volume (ml) of the strong alkali solution is 1:6-8.

[0014] (2) mixing an alkali-modified CHA molecular sieve with a 0.4-0.6 mol / L ammonium acetate solution at a solid-liquid volume ratio of 1:6-8, treating in a water bath at 65-70° C. for 2-3 h, washing, drying, and calcining at 600-650° C. for 3-4 h to obtain a collector intermediate; uniformly mixing the collector intermediate with alumina powder and methyl cellulose, fully rolling and forming, and calcining at 600-700° C. for 8-10 hours to obtain a collector.

[0015] In one embodiment, the preparation method of the capture agent is:

[0016] (1) adding Fe / Cu-SAPO molecular sieve into a pressure-resistant container filled with a strong alkali solution, sealing the system, increasing the pressure to 1.0 MPa, then increasing the temperature to 90° C., treating at a constant temperature for 9 hours, taking out, washing, and drying, and then calcining at 450° C. for 8 hours to obtain an alkali-modified CHA type molecular sieve; the concentration of the strong alkali solution is 1.0 mol / L; the ratio of the amount of the Fe / Cu-SAPO molecular sieve added (g) to the volume of the strong alkali solution (ml) is 1:8;

[0017] (2) Mixing the alkali-modified CHA molecular sieve with 0.4 mol / L ammonium acetate solution at a solid-liquid volume ratio of 1:8, treating in a 65°C water bath for 3 h, washing, drying, and calcining at 600°C for 4 h to obtain a collector intermediate; mixing the collector intermediate with alumina powder and methyl cellulose, fully rolling and forming, and calcining at 600°C for 10 hours to obtain a collector.

[0018] In one embodiment, the preparation method of the capture agent is:

[0019] (1) Adding Fe / Cu-SAPO molecular sieve into a pressure-resistant container filled with a strong alkali solution, and sealing the system, increasing the pressure to 1.5 MPa, and then increasing the temperature to 100° C., and treating at a constant temperature for 6 hours, taking out, washing, and drying, and then calcining at 650° C. for 6 hours to obtain an alkali-modified CHA type molecular sieve; the concentration of the strong alkali solution is 2.0 mol / L; the ratio of the amount of the Fe / Cu-SAPO molecular sieve added (g) to the volume of the strong alkali solution (ml) is 1:6;

[0020] (2) Mixing the alkali-modified CHA molecular sieve with 0.6 mol / L ammonium acetate solution at a solid-liquid volume ratio of 1:6, treating in a 70°C water bath for 2 h, washing, drying, and calcining at 650°C for 3 h to obtain a collector intermediate; mixing the collector intermediate with alumina powder and methyl cellulose, fully rolling and forming, and calcining at 700°C for 8 hours to obtain a collector.

[0021] In one embodiment, the preparation method of the capture agent is:

[0022] (1) Adding Fe / Cu-SAPO molecular sieve into a pressure-resistant container filled with a strong alkali solution, and sealing the system, increasing the pressure to 1.5 MPa, and then increasing the temperature to 100° C., and treating at a constant temperature for 9 hours. After washing and drying, the mixture is calcined at 650° C. for 8 hours to obtain an alkali-modified CHA molecular sieve; the concentration of the strong alkali solution is 2.0 mol / L; the ratio of the amount of Fe / Cu-SAPO molecular sieve added (g) to the volume of the strong alkali solution (ml) is 1:8;

[0023] (2) Mixing the alkali-modified CHA molecular sieve with 0.6 mol / L ammonium acetate solution at a solid-liquid volume ratio of 1:8, treating in a 70°C water bath for 3 h, washing, drying, and calcining at 650°C for 4 h to obtain a collector intermediate; mixing the collector intermediate with alumina powder and methyl cellulose, fully rolling and forming, and calcining at 700°C for 10 hours to obtain a collector.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The collector provided by the present invention, which is composed of alkali-modified CHA molecular sieve, alumina and methyl cellulose, can adapt to the complex and harsh working conditions in industrial tail gas purification and treatment, and is very suitable for the purification of sulfur-containing components in industrial tail gas.

[0026] 2. The preparation method of the present invention is simple, easy to operate, and easy to industrialize and mass produce.

[0027] 3. The raw materials of the present invention are abundant in the country and the price is suitable, so that there is no high cost limit for its large-scale production. DETAILED DESCRIPTION

[0028] Example 1

[0029] Weigh the specific raw materials according to Table 1, and the remaining preparation steps are as follows:

[0030] (1) adding Fe / Cu-SAPO molecular sieve into a pressure-resistant container filled with a strong alkali solution, sealing the system, increasing the pressure to 1.0 MPa, then increasing the temperature to 90° C., treating at a constant temperature for 9 hours, taking out, washing, and drying, and then calcining at 450° C. for 8 hours to obtain an alkali-modified CHA type molecular sieve; the concentration of the strong alkali solution is 1.0 mol / L; the ratio of the amount of the Fe / Cu-SAPO molecular sieve added (g) to the volume of the strong alkali solution (ml) is 1:8;

[0031] (2) Mixing the alkali-modified CHA molecular sieve with 0.4 mol / L ammonium acetate solution at a solid-liquid volume ratio of 1:8, treating in a 65°C water bath for 3 h, washing, drying, and calcining at 600°C for 4 h to obtain a collector intermediate; mixing the collector intermediate with alumina powder and methyl cellulose, fully rolling and forming, and calcining at 600°C for 10 hours to obtain a collector.

[0032] Example 2

[0033] Weigh the specific raw materials according to Table 1, and the remaining preparation steps are as follows:

[0034] (1) Adding Fe / Cu-SAPO molecular sieve into a pressure-resistant container filled with a strong alkali solution, and sealing the system, increasing the pressure to 1.5 MPa, and then increasing the temperature to 100° C., and treating at a constant temperature for 6 hours, taking out, washing, and drying, and then calcining at 650° C. for 6 hours to obtain an alkali-modified CHA type molecular sieve; the concentration of the strong alkali solution is 2.0 mol / L; the ratio of the amount of the Fe / Cu-SAPO molecular sieve added (g) to the volume of the strong alkali solution (ml) is 1:6;

[0035] (2) Mixing the alkali-modified CHA molecular sieve with 0.6 mol / L ammonium acetate solution at a solid-liquid volume ratio of 1:6, treating in a 70°C water bath for 2 h, washing, drying, and calcining at 650°C for 3 h to obtain a collector intermediate; mixing the collector intermediate with alumina powder and methyl cellulose, fully rolling and forming, and calcining at 700°C for 8 hours to obtain a collector.

[0036] Example 3

[0037] Weigh the specific raw materials according to Table 1, and the remaining preparation steps are as follows:

[0038] (1) Adding Fe / Cu-SAPO molecular sieve into a pressure-resistant container filled with a strong alkali solution, and sealing the system, increasing the pressure to 1.5 MPa, and then increasing the temperature to 100° C., and treating at a constant temperature for 9 hours. After washing and drying, the mixture is calcined at 650° C. for 8 hours to obtain an alkali-modified CHA molecular sieve; the concentration of the strong alkali solution is 2.0 mol / L; the ratio of the amount of Fe / Cu-SAPO molecular sieve added (g) to the volume of the strong alkali solution (ml) is 1:8;

[0039] (2) Mixing the alkali-modified CHA molecular sieve with 0.6 mol / L ammonium acetate solution at a solid-liquid volume ratio of 1:8, treating in a 70°C water bath for 3 h, washing, drying, and calcining at 650°C for 4 h to obtain a collector intermediate; mixing the collector intermediate with alumina powder and methyl cellulose, fully rolling and forming, and calcining at 700°C for 10 hours to obtain a collector.

[0040] Comparative Example 1

[0041] Weigh the specific raw materials according to Table 1. The preparation steps are as follows:

[0042] The Fe / Cu-SAPO molecular sieve was mixed with 0.6 mol / L ammonium acetate solution in a solid-liquid volume ratio of 1:8, treated in a 70°C water bath for 3 hours, washed, dried, and calcined at 650°C for 4 hours to obtain a collector intermediate; the collector intermediate was evenly mixed with alumina powder and methyl cellulose, fully rolled and formed, and calcined at 700°C for 10 hours to obtain a collector.

[0043] Comparative Example 2

[0044] Weigh the specific raw materials according to Table 1, and the remaining preparation steps are as follows:

[0045] The ZSM-5 molecular sieve was mixed with 0.6 mol / L ammonium acetate solution in a solid-liquid volume ratio of 1:8, treated in a 70°C water bath for 3 hours, washed, dried, and calcined at 650°C for 4 hours to obtain a collector intermediate; the collector intermediate was evenly mixed with alumina powder and methyl cellulose, fully rolled and formed, and calcined at 700°C for 10 hours to obtain a collector.

[0046] Table 1

[0047]

[0048] Example 4 Performance Test

[0049] The COS and H2S contents in the raw gas and clean gas described in the above Examples 1 to 3 and Comparative Examples 1 to 2 were tested. The test method was in accordance with the corresponding national standards. The test results are shown in Table 2.

[0050] Table 2 Performance test results

[0051]

[0052] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. An industrial waste gas treatment process, the treatment process is to use a collector to capture sulfur-containing particles in the industrial waste gas, the collector is filled in a capture tower to control the introduction rate of the industrial waste gas, and the collector is composed of alkali-modified Fe / Cu-SAPO molecular sieve, alumina, and methyl cellulose; The collector is composed of the following raw materials in parts by weight: It is composed of 80 parts of alkali-modified Fe / Cu-SAPO molecular sieve, 140 parts of alumina, and 10 parts of methyl cellulose; The alkali-modified Fe / Cu-SAPO molecular sieve is prepared by treating the Fe / Cu-SAPO molecular sieve with a strong alkali solution; The preparation method of the trapping agent is: (1) adding Fe / Cu-SAPO molecular sieve into a pressure-resistant container filled with a strong alkali solution, sealing the system, increasing the pressure to 1.5 MPa, then increasing the temperature to 100° C., and treating at a constant temperature for 9 hours. After washing and drying, the mixture is calcined at 650° C. for 8 hours to obtain an alkali-modified Fe / Cu-SAPO molecular sieve; the concentration of the strong alkali solution is 2.0 mol / L; and the ratio of the amount of the Fe / Cu-SAPO molecular sieve added to the volume of the strong alkali solution is 1:8 g / ml; (2) mixing the alkali-modified Fe / Cu-SAPO molecular sieve with 0.6 mol / L ammonium acetate solution at a solid-liquid volume ratio of 1:8, treating in a 70°C water bath for 3 h, washing, drying, and calcining at 650°C for 4 h to obtain a collector intermediate; mixing the collector intermediate with alumina powder and methyl cellulose, fully rolling and forming, and calcining at 700°C for 10 h to obtain a collector; The strong base is sodium hydroxide or potassium hydroxide.

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