A method for preparing and molding a deacidifying agent for purifying incineration flue gas.

Abstract

This invention relates to a method for preparing and molding a deacidifying agent for purifying incineration flue gas. The method comprises the following steps: mixing fly ash, quicklime, and calcium sulfate uniformly to obtain a mixed raw material, wherein the weight ratio of fly ash, quicklime, and calcium sulfate is (1-5):(0.5-2):1; mixing the mixed raw material with water and adding it to a hydrothermal reactor for hydrothermal reaction while stirring to obtain a hydrated slurry, wherein the hydrothermal reaction temperature is 90-180℃; filtering the hydrated slurry and drying it to constant weight to obtain the deacidifying agent. This invention provides a deacidifying agent prepared by hydrothermal reaction using fly ash, quicklime, and calcium sulfate as raw materials, which has low cost, large specific surface area, and high adsorption capacity, thereby increasing adsorption time and reducing the frequency of deacidifying agent replacement; furthermore, the deacidifying agent prepared by this invention can simultaneously adsorb and remove multiple acidic gases.

Description

Technical Field

[0001] This invention relates to the field of deacidification process technology in the nuclear industry, and in particular to a method for preparing and molding a deacidification agent for purifying incineration flue gas. Background Technology

[0002] Radioactive combustible solid waste generated during the nuclear fuel cycle and nuclear technology utilization processes often contains components such as PVC and rubber. Therefore, the incineration flue gas inevitably contains acidic gases such as HCl, SO2, and NOx, typically ranging from several hundred to several thousand milligrams per cubic meter (standard conditions). If these acidic gases are emitted directly without treatment, they will harm humans and their living environment. Furthermore, in practical engineering applications, large amounts of untreated acidic gases in the incineration flue gas will cause severe corrosion problems in the flue and other equipment in the tail gas purification process. Therefore, the absorption of acidic gases in the incineration process is an indispensable part of the tail gas purification process.

[0003] Typically, the removal of acidic gases from flue gas is achieved primarily through acid-base neutralization reactions. Acid removal processes include wet, semi-dry, and dry processes. Wet acid removal processes are highly efficient and widely used, but they also suffer from drawbacks such as complex processes, severe equipment corrosion, high operating costs, and the generation of large amounts of secondary waste liquid. Semi-dry acid removal processes are simple and have high acid gas removal efficiency, but they are heavily reliant on dust collection devices such as bag filters, easily leading to high loads and replacement pressures on these devices. Especially in the radioactive field, frequent backflushing and filter media replacements reduce the overall safety of the process, and the additional fly ash from the alkaline deacidifying agent increases the pressure on radioactive waste treatment and disposal. The biggest advantages of dry acid removal processes are: ① no waste liquid is generated, the deacidification product is solid, and it is easy to handle and dispose of; ② the equipment is less corrosive and easy to replace; ③ the process flow is simple, and the equipment investment and maintenance costs are relatively low; ④ the deacidification equipment design and layout are flexible. The application of dry deacidification technology will further highlight the advantages of mobile radioactive waste treatment facilities, avoiding problems such as secondary radioactive wastewater and difficulties in operation and maintenance during the waste treatment process.

[0004] Currently, the main problems with the application of dry desulfurization materials are concentrated on traditional alkaline desulfurization materials such as lime. These materials have small reaction areas, high consumption, short effective absorption times, incomplete reactions, and limited application forms. Existing high-efficiency desulfurization materials are scarce, and there are limitations in the availability of single sources. Therefore, there is a need to develop a high-efficiency, low-cost desulfurization agent that can be used for the purification of various types of radioactive incineration flue gas to meet the needs of experiments and research. These problems urgently need to be solved. Summary of the Invention

[0005] This invention discloses a method for preparing and molding a deacidifying agent for purifying incineration flue gas, aiming to solve the technical problems existing in the prior art.

[0006] The present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a method for preparing a deacidifying agent for purifying incineration flue gas, comprising the following steps:

[0008] Fly ash, quicklime, and calcium sulfate are mixed evenly to obtain a mixed raw material, wherein the weight ratio of fly ash, quicklime, and calcium sulfate is (1-5):(0.5-2):1;

[0009] The mixed raw materials are mixed with water and then added to a hydrothermal reactor for hydrothermal reaction while being stirred to obtain a hydrated slurry. The temperature of the hydrothermal reaction is 90-180°C.

[0010] The hydrated slurry was filtered and dried to constant weight to obtain a deacidifying agent.

[0011] In the preparation method of the deacidifying agent for purifying incineration flue gas of the present invention, the weight ratio of water to the mixed raw materials is 10:1 to 50:3.

[0012] In the preparation method of the deacidifying agent for purifying incineration flue gas of the present invention, the temperature of the hydrothermal reaction is 150°C.

[0013] In the preparation method of the deacidifying agent for purifying incineration flue gas of the present invention, the hydrothermal reaction time is 2 to 12 hours.

[0014] In the preparation method of the deacidifying agent for purifying incineration flue gas of the present invention, the hydrothermal reaction time is 8 hours.

[0015] In the preparation method of the deacidifying agent for purifying incineration flue gas of the present invention, the weight ratio of the fly ash, the quicklime and the calcium sulfate is 3:1:1.

[0016] In a second aspect, the present invention also provides a method for molding a deacidifying agent, wherein the deacidifying agent is prepared by any of the preparation methods described above, and the molding method includes the following steps:

[0017] The deacidifying agent is ground to obtain a ground powder;

[0018] The ground powder is mixed with a binder to obtain a clay-like product;

[0019] The clay-like product is placed in a mold, pressed into shape, demolded, and dried to constant weight to obtain a highly active honeycomb deacidifying agent.

[0020] In the molding method of the present invention, the particle size of the grinding powder is less than or equal to 100 mesh.

[0021] In the molding method of the present invention, the adhesive is water, and the weight ratio of the adhesive to the grinding powder is 1.1 to 1.15:1.

[0022] In the molding method of the present invention, the drying temperature is 60 degrees Celsius and the drying time is 6 hours.

[0023] The technical solution adopted in this invention can achieve the following beneficial effects:

[0024] This invention provides a method for preparing a deacidifying agent for purifying incineration flue gas. The method involves a hydrothermal reaction using fly ash, quicklime, and calcium sulfate as raw materials to obtain the final deacidifying agent. The deacidifying agent prepared by this invention has low cost, a large specific surface area, and can improve the adsorption rate of acidic gases, thereby increasing the deacidification efficiency. It also has a high adsorption capacity, which can increase the adsorption time, reduce the frequency of agent replacement, and reduce harm to operators. Furthermore, the deacidifying agent prepared by this invention can simultaneously adsorb and remove multiple acidic gases. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments. In the description of this invention, it should be noted that the term "or" is generally used to include the meaning of "and / or," unless otherwise expressly indicated.

[0026] Unless explicitly stated otherwise, the numerical parameters in this specification and the appended claims may be approximate values ​​and can be varied according to the desired characteristics obtained from the content of this invention. Specifically, all figures used in the specification and claims to indicate the content of composition, reaction conditions, etc., should be understood to be modified by the term "about" in all cases. Generally, this means that there may be variations of ±10% in some embodiments, ±5% in some embodiments, ±1% in some embodiments, and ±0.5% in some embodiments.

[0027] Furthermore, the word "comprising" does not exclude the presence of materials or steps not listed in the claims. The ordinal numbers used in the specification and claims, such as "first," "second," "third," and Arabic numerals and letters, to modify corresponding elements or steps, do not in themselves imply an order of manufacturing process; their use is solely to ensure clear distinction between steps.

[0028] Furthermore, unless otherwise specified or required to occur in a specific order, the order of the above steps is not limited to those listed above and can be varied or rearranged according to the desired design. Moreover, the above embodiments can be used in combination with each other or with other embodiments based on design and reliability considerations; that is, technical features from different embodiments can be freely combined to form more embodiments.

[0029] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0030] To address the problems existing in the prior art, this application provides a method for preparing and molding a deacidifying agent for purifying incineration flue gas.

[0031] The powder ash composition of the present invention is as follows:

[0032]

[0033] A method for preparing a deacidifying agent for purifying incineration flue gas includes the following steps:

[0034] Fly ash, quicklime, and calcium sulfate are mixed evenly to obtain a mixed raw material. The weight ratio of fly ash, quicklime, and calcium sulfate is (1-5):(0.5-2):1. When the ratio exceeds the above range, the performance of the deacidifying agent will deteriorate.

[0035] The mixed raw materials are added to a hydrothermal reactor after being mixed with water to carry out a hydrothermal reaction while being stirred, to obtain a hydrated slurry. The temperature of the hydrothermal reaction is 90-180℃.

[0036] The hydrated slurry was filtered and dried to constant weight to obtain a deacidifying agent.

[0037] This invention discloses a method for preparing a deacidifying agent for purifying incineration flue gas. The method involves a hydrothermal reaction using fly ash, quicklime, and calcium sulfate as raw materials to obtain the final deacidifying agent. The deacidifying agent prepared by this invention has low cost, a large specific surface area, and can improve the adsorption rate of acidic gases, thereby increasing deacidification efficiency. It also has a high adsorption capacity, which can extend the adsorption time, reduce the frequency of agent replacement, and minimize harm to operators. Furthermore, the deacidifying agent prepared by this invention can simultaneously adsorb and remove multiple acidic gases. In practical operation, the theoretical value of the radioactivity concentration of the flue gas purified by the highly active honeycomb deacidifying agent prepared by this invention is lower than the concentration specified in the exemption standard; therefore, the waste deacidifying agent can be treated as non-radioactive waste.

[0038] Preferably, the weight ratio of water to the mixed raw materials is 10:1 to 50:3; within this range, the prepared deacidifying agent has a better specific surface area and acid gas adsorption capacity; if the ratio is too low, the reaction will be insufficient; if the ratio is too high, the yield will decrease.

[0039] In some preferred embodiments, the hydrothermal reaction temperature is 150°C, at which temperature the prepared deacidifying agent has the largest specific surface area; between 90 and 150°C, the specific surface area of ​​the deacidifying agent increases with increasing temperature, but as the temperature continues to rise, the specific surface area of ​​the deacidifying agent gradually decreases.

[0040] In some preferred embodiments, the hydrothermal reaction time is 2 to 12 hours; when the hydrothermal reaction time is less than 2 hours or more than 12 hours, the reaction is too short and the reaction is incomplete, while the reaction time is too long, resulting in energy waste and increased energy consumption.

[0041] Preferably, the hydrothermal reaction time is 8 hours; at this time, the specific surface area of ​​the deacidifying agent is the largest.

[0042] In some preferred embodiments, the weight ratio of fly ash, quicklime, and calcium sulfate is 3:1:1.

[0043] In some preferred embodiments, the stirring speed is 200 r / min during the stirring process.

[0044] In some preferred embodiments, the drying temperature is 60°C.

[0045] In some preferred embodiments, the drying time is 6 hours.

[0046] A method for molding a deacidifying agent, wherein the deacidifying agent is prepared by the above-described preparation method, and the molding method includes the following steps:

[0047] The deacidifying agent is ground to obtain a powder; the powder is mixed with a binder to obtain a clay-like product; the clay-like product is placed in a mold, pressed into shape, demolded, and dried to constant weight to obtain a highly active honeycomb deacidifying agent.

[0048] In some preferred embodiments, the particle size of the grinding powder is less than or equal to 100 mesh.

[0049] In some preferred embodiments, the binder is water, and the weight ratio of the binder to the grinding powder is 1.1 to 1.15:1; if the ratio is too low, there will be too little binder, making it difficult to form; if the ratio is too high, there will be too much binder, also making it difficult to form.

[0050] In some preferred embodiments, the drying temperature is 60 degrees Celsius and the time is 6 hours.

[0051] In some preferred embodiments, the mold is a self-made honeycomb mold made of 304 stainless steel.

[0052] Specifically, the outer diameter of the mold is Φ50mm and the diameter of the round hole is Φ3mm; preferably, multiple round holes are spaced apart, for example, with a spacing of 6mm.

[0053] Example 1

[0054] Mix 90g fly ash, 30g quicklime and 30g calcium sulfate, and add 2500ml water while stirring to obtain the mixed raw materials;

[0055] The mixed raw materials were added to a double-walled glass hydrothermal reactor and heated to 150°C for hydrothermal reaction. The mixture was stirred at the same time (stirring rod speed was 200 r / min) for 8 hours to obtain hydrated slurry.

[0056] The hydrated slurry was filtered and dried at 60°C for 6 hours to constant weight to obtain a highly active deacidifying agent.

[0057] The highly active deacidifying agent prepared by the high-activity honeycomb deacidifying agent is ground and sieved (100 mesh) to obtain highly active deacidifying agent powder;

[0058] After mixing 20g of highly active deacidifying agent powder with 23mL of water, a clay-like product was obtained.

[0059] The clay-like product was placed in a honeycomb mold, pressed into shape, pushed out, and dried at 60°C for 6 hours to constant weight to obtain a highly active honeycomb deacidifying agent.

[0060] Performance testing:

[0061] To test the adsorption capacity of the highly active honeycomb deacidifying agent prepared in the above example for acidic gases (such as HCl, SO2, NO) in flue gas: Take 300g of the prepared highly active honeycomb deacidifying agent and place it in the deacidification test bench. Pass a mixed gas at 60°C to the absorption tube loaded with the highly active honeycomb deacidifying agent to simulate flue gas. Pass the flue gas at the outlet of the absorption tube into the flue gas online monitoring instrument, record the outlet flue gas concentration, and calculate the corresponding adsorption capacity.

[0062] Calculations show that the specific surface area of ​​the highly active honeycomb deacidifying agent prepared in Example 1 is 76.4 m². 2 The adsorption capacities for acidic gases in flue gas were as follows: HCl - 210 mg / g; SO2 - 35 mg / g; NO - 2.4 mg / g.

[0063] Example 2

[0064] Mix 90g fly ash, 30g quicklime and 30g calcium sulfate, and add 2500ml water while stirring to obtain the mixed raw materials;

[0065] The mixed raw materials were added to a double-walled glass hydrothermal reactor and heated to 90°C for hydrothermal reaction. The mixture was stirred at the same time (stirring rod speed was 200 r / min) for 8 hours to obtain hydrated slurry.

[0066] The hydrated slurry was filtered and dried at 60°C for 6 hours to constant weight to obtain a highly active deacidifying agent.

[0067] The highly active deacidifying agent prepared by the high-activity honeycomb deacidifying agent is ground and sieved (100 mesh) to obtain highly active deacidifying agent powder;

[0068] After mixing 20g of highly active deacidifying agent powder with 23mL of water, a clay-like product was obtained.

[0069] The clay-like product was placed in a honeycomb mold, pressed into shape, pushed out, and dried at 60°C for 6 hours to constant weight to obtain a highly active honeycomb deacidifying agent.

[0070] Performance testing:

[0071] The adsorption capacity of the prepared high-activity honeycomb deacidifying agent for acidic gases (such as HCl, SO2, NO) in flue gas was tested: 300g of the prepared high-activity honeycomb deacidifying agent was placed in the deacidification test bench, and a mixed gas at 60°C was introduced into the absorption tube loaded with the high-activity honeycomb deacidifying agent to simulate flue gas. The flue gas at the outlet of the absorption tube was introduced into the flue gas online monitoring instrument, the outlet flue gas concentration was recorded, and the corresponding adsorption capacity was calculated.

[0072] Calculations show that the specific surface area of ​​the prepared highly active honeycomb deacidifying agent is 38.2 m². 2 The adsorption capacities for acidic gases in flue gas were as follows: HCl - 160 mg / g; SO2 - 32 mg / g; NO - 3.5 mg / g.

[0073] Example 3

[0074] The difference between this embodiment and Embodiment 1 is that the hydrothermal reaction temperature in this embodiment is 180°C, while the other conditions are the same as in Embodiment 1.

[0075] Performance testing:

[0076] To test the adsorption capacity of the highly active honeycomb deacidifying agent prepared in the above example for acidic gases (such as HCl, SO2, NO) in flue gas: Take 300g of the prepared highly active honeycomb deacidifying agent and place it in the deacidification test bench. Pass a mixed gas at 60°C to the absorption tube loaded with the highly active honeycomb deacidifying agent to simulate flue gas. Pass the flue gas at the outlet of the absorption tube into the flue gas online monitoring instrument, record the outlet flue gas concentration, and calculate the corresponding adsorption capacity.

[0077] Calculations show that the specific surface area of ​​the prepared highly active honeycomb deacidifying agent is 52.7 m². 2The adsorption capacities for acidic gases in flue gas were HCl-149 mg / g, SO2-30.7 mg / g, and NO-2.1 mg / g, respectively.

[0078] Example 4

[0079] The difference between this embodiment and Embodiment 1 is that the amounts of fly ash, quicklime, and calcium sulfate added in this embodiment are 30g, 15g, and 30g, respectively, and 1250ml of water is added while stirring to obtain a mixed raw material. The other conditions are the same as in Embodiment 1.

[0080] Performance testing:

[0081] To test the adsorption capacity of the highly active honeycomb deacidifying agent prepared in the above example for acidic gases (such as HCl, SO2, NO) in flue gas: Take 300g of the prepared highly active honeycomb deacidifying agent and place it in the deacidification test bench. Pass a mixed gas at 60°C to the absorption tube loaded with the highly active honeycomb deacidifying agent to simulate flue gas. Pass the flue gas at the outlet of the absorption tube into the flue gas online monitoring instrument, record the outlet flue gas concentration, and calculate the corresponding adsorption capacity.

[0082] Calculations show that the specific surface area of ​​the prepared highly active honeycomb deacidifying agent is 11.2 m². 2 The adsorption capacities for acidic gases in flue gas were as follows: HCl - 105 mg / g; SO2 - 20.3 mg / g; NO - 1.4 mg / g.

[0083] Example 5

[0084] The difference between this embodiment and Embodiment 1 is that the amounts of fly ash, quicklime, and calcium sulfate added in this embodiment are 50g, 20g, and 10g, respectively, and 1335ml of water is added while stirring to obtain a mixed raw material. The other conditions are the same as in Embodiment 1.

[0085] Performance testing:

[0086] To test the adsorption capacity of the highly active honeycomb deacidifying agent prepared in the above example for acidic gases (such as HCl, SO2, NO) in flue gas: Take 300g of the prepared highly active honeycomb deacidifying agent and place it in the deacidification test bench. Pass a mixed gas at 60°C to the absorption tube loaded with the highly active honeycomb deacidifying agent to simulate flue gas. Pass the flue gas at the outlet of the absorption tube into the flue gas online monitoring instrument, record the outlet flue gas concentration, and calculate the corresponding adsorption capacity.

[0087] Calculations show that the specific surface area of ​​the prepared highly active honeycomb deacidifying agent is 7.79 m². 2 The adsorption capacities for acidic gases in flue gas were HCl - 99 mg / g; SO2 - 17.2 mg / g; NO - 1.26 mg / g, respectively.

[0088] Example 6

[0089] The difference between this embodiment and Embodiment 1 is that the hydrothermal reaction time in this embodiment is 2 hours, while the other conditions are the same as in Embodiment 1.

[0090] Performance testing:

[0091] To test the adsorption capacity of the highly active honeycomb deacidifying agent prepared in the above example for acidic gases (such as HCl, SO2, NO) in flue gas: Take 300g of the prepared highly active honeycomb deacidifying agent and place it in the deacidification test bench. Pass a mixed gas at 60°C to the absorption tube loaded with the highly active honeycomb deacidifying agent to simulate flue gas. Pass the flue gas at the outlet of the absorption tube into the flue gas online monitoring instrument, record the outlet flue gas concentration, and calculate the corresponding adsorption capacity.

[0092] Calculations show that the specific surface area of ​​the prepared highly active honeycomb deacidifying agent is 15.6 m². 2 The adsorption capacities for acidic gases in flue gas were as follows: HCl - 122 mg / g; SO2 - 27.6 mg / g; NO - 1.6 mg / g.

[0093] Example 7

[0094] The difference between this embodiment and Embodiment 1 is that the hydrothermal reaction time in this embodiment is 12 hours, while the other conditions are the same as in Embodiment 1.

[0095] Performance testing:

[0096] To test the adsorption capacity of the highly active honeycomb deacidifying agent prepared in the above example for acidic gases (such as HCl, SO2, NO) in flue gas: Take 300g of the prepared highly active honeycomb deacidifying agent and place it in the deacidification test bench. Pass a mixed gas at 60°C to the absorption tube loaded with the highly active honeycomb deacidifying agent to simulate flue gas. Pass the flue gas at the outlet of the absorption tube into the flue gas online monitoring instrument, record the outlet flue gas concentration, and calculate the corresponding adsorption capacity.

[0097] Calculations show that the specific surface area of ​​the prepared highly active honeycomb deacidifying agent is 54.1 m². 2 The adsorption capacities for acidic gases in flue gas were as follows: HCl - 153 mg / g; SO2 - 32.1 mg / g; NO - 2.05 mg / g.

[0098] Example 8

[0099] The difference between this embodiment and Embodiment 1 is that in this embodiment, 90g of fly ash, 30g of quicklime and 30g of calcium sulfate are mixed and 1500ml of water is added while stirring to obtain the mixed raw materials. The other conditions are the same as in Embodiment 1.

[0100] Performance testing:

[0101] To test the adsorption capacity of the highly active honeycomb deacidifying agent prepared in the above example for acidic gases (such as HCl, SO2, NO) in flue gas: Take 300g of the prepared highly active honeycomb deacidifying agent and place it in the deacidification test bench. Pass a mixed gas at 60°C to the absorption tube loaded with the highly active honeycomb deacidifying agent to simulate flue gas. Pass the flue gas at the outlet of the absorption tube into the flue gas online monitoring instrument, record the outlet flue gas concentration, and calculate the corresponding adsorption capacity.

[0102] Calculations show that the specific surface area of ​​the prepared highly active honeycomb deacidifying agent is 46.8 m². 2 The adsorption capacities for acidic gases in flue gas were as follows: HCl - 142 mg / g; SO2 - 29.33 mg / g; NO - 2.09 mg / g.

[0103] Example 9

[0104] The difference between this embodiment and Embodiment 1 is that in this embodiment, 90g of fly ash, 30g of quicklime and 30g of calcium sulfate are mixed and 2000ml of water is added while stirring to obtain the mixed raw materials. The other conditions are the same as in Embodiment 1.

[0105] Performance testing:

[0106] To test the adsorption capacity of the highly active honeycomb deacidifying agent prepared in the above example for acidic gases (such as HCl, SO2, NO) in flue gas: Take 300g of the prepared highly active honeycomb deacidifying agent and place it in the deacidification test bench. Pass a mixed gas at 60°C to the absorption tube loaded with the highly active honeycomb deacidifying agent to simulate flue gas. Pass the flue gas at the outlet of the absorption tube into the flue gas online monitoring instrument, record the outlet flue gas concentration, and calculate the corresponding adsorption capacity.

[0107] Calculations show that the specific surface area of ​​the prepared highly active honeycomb deacidifying agent is 57.1 m². 2 The adsorption capacities for acidic gases in flue gas were as follows: HCl - 163.3 mg / g; SO2 - 34.53 mg / g; NO - 2.41 mg / g.

[0108] Comparative Example 1

[0109] The difference between this comparative example and Example 1 is that the hydrothermal reaction temperature in this comparative example is 80°C, while the rest is the same as in Example 1.

[0110] Performance testing:

[0111] To test the adsorption capacity of the highly active honeycomb deacidifying agent prepared in the above comparative example for acidic gases (such as HCl, SO2, NO) in flue gas: Take 300g of the prepared highly active honeycomb deacidifying agent and place it in the deacidification test bench. Pass a mixed gas at 60°C to simulate flue gas into the absorption tube loaded with the highly active honeycomb deacidifying agent. Pass the flue gas at the outlet of the absorption tube into the flue gas online monitoring instrument, record the outlet flue gas concentration, and calculate the corresponding adsorption capacity.

[0112] Calculations show that the specific surface area of ​​the prepared highly active honeycomb deacidifying agent is 12.8 m². 2 The adsorption capacities for acidic gases in flue gas were as follows: HCl - 116 mg / g; SO2 - 23.9 mg / g; NO - 1.43 mg / g.

[0113] Comparative Example 2

[0114] The difference between this comparative example and Example 1 is that the hydrothermal reaction temperature in this comparative example is 200°C, while the rest is the same as in Example 1.

[0115] Performance testing:

[0116] To test the adsorption capacity of the highly active honeycomb deacidifying agent prepared in the above comparative example for acidic gases (such as HCl, SO2, NO) in flue gas: Take 300g of the prepared highly active honeycomb deacidifying agent and place it in the deacidification test bench. Pass a mixed gas at 60°C to simulate flue gas into the absorption tube loaded with the highly active honeycomb deacidifying agent. Pass the flue gas at the outlet of the absorption tube into the flue gas online monitoring instrument, record the outlet flue gas concentration, and calculate the corresponding adsorption capacity.

[0117] Calculations show that the specific surface area of ​​the prepared highly active honeycomb deacidifying agent is 56.6 m². 2 The adsorption capacities for acidic gases in flue gas were as follows: HCl - 155 mg / g; SO2 - 34.2 mg / g; NO - 2.1 mg / g.

[0118] Comparative Example 3

[0119] The difference between this comparative example and Example 1 is that the hydrothermal reaction time in this comparative example is 15 hours, while the rest is the same as in Example 1.

[0120] Performance testing:

[0121] To test the adsorption capacity of the highly active honeycomb deacidifying agent prepared in the above comparative example for acidic gases (such as HCl, SO2, NO) in flue gas: Take 300g of the prepared highly active honeycomb deacidifying agent and place it in the deacidification test bench. Pass a mixed gas at 60°C to simulate flue gas into the absorption tube loaded with the highly active honeycomb deacidifying agent. Pass the flue gas at the outlet of the absorption tube into the flue gas online monitoring instrument, record the outlet flue gas concentration, and calculate the corresponding adsorption capacity.

[0122] Calculations show that the specific surface area of ​​the prepared highly active honeycomb deacidifying agent is 64.5 m². 2 The adsorption capacities for acidic gases in flue gas were as follows: HCl - 176 mg / g; SO2 - 34.1 mg / g; NO - 2.38 mg / g.

[0123] The embodiments of the present invention have been described above. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A method for preparing a deacidifying agent for purifying incineration flue gas, characterized in that, Includes the following steps: Fly ash, quicklime, and calcium sulfate are mixed evenly to obtain a mixed raw material, wherein the weight ratio of fly ash, quicklime, and calcium sulfate is 3:1:

1. The mixed raw materials are mixed with water and then added to a hydrothermal reactor for hydrothermal reaction while being stirred to obtain a hydrated slurry. The temperature of the hydrothermal reaction is 150°C. The weight ratio of water to the mixed raw materials is 50:3; The hydrothermal reaction time is 8 hours; The hydrated slurry was filtered and dried to constant weight to obtain a deacidifying agent.

2. A method for molding a deacidifying agent, characterized in that, The deacidifying agent is prepared by the preparation method described in claim 1, and the molding method includes the following steps: The deacidifying agent is ground to obtain a ground powder; The ground powder is mixed with a binder to obtain a clay-like product; The clay-like product is placed in a mold, pressed into shape, demolded, and dried to constant weight to obtain a highly active honeycomb deacidifying agent.

3. The molding method according to claim 2, characterized in that, The particle size of the grinding powder is less than or equal to 100 mesh.

4. The molding method according to claim 2, characterized in that, The adhesive is water, and the weight ratio of the adhesive to the grinding powder is 1.1 to 1.15:

1.

5. The molding method according to claim 2, characterized in that, The drying process is carried out at a temperature of 60 degrees Celsius for 6 hours.

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