Preparation method and forming method of deacidification agent for purifying incineration flue gas

Abstract

The invention relates to a preparation method and a forming method of a deacidification agent for purifying incineration flue gas, and the preparation method of the deacidification agent for purifying incineration flue gas comprises the following steps: uniformly mixing fly ash, slaked lime and calcium sulfate according to a weight ratio of (1-5): (0.5-2): 1 to obtain a mixed raw material; the mixed raw materials and water are mixed and then added into a hydrothermal reactor to be subjected to a hydrothermal reaction, stirring is conducted at the same time, hydrated slurry is obtained, and the temperature of the hydrothermal reaction is 90-180 DEG C; and carrying out suction filtration on the hydrated slurry, and drying to constant weight to obtain the deacidification agent. The deacidification agent prepared from the coal ash, the slaked lime and the calcium sulfate through the hydrothermal reaction is low in cost, large in specific surface area and high in adsorption capacity, the adsorption duration can be prolonged, and the replacement frequency of the deacidification agent is reduced; and the deacidification agent prepared by the preparation method disclosed by the invention can be used for adsorbing and removing various acidic gases at the same time.

Description

Technical Field

[0001] The invention relates to the technical field of deacidification process in nuclear industry, and in particular to a preparation method and a molding method of a deacidification agent for purifying incineration flue gas. Background Art

[0002] Most of the radioactive combustible solid wastes generated in the process of nuclear fuel cycle and nuclear technology utilization contain components such as PVC and rubber. Therefore, the incineration flue gas will inevitably contain acid gases such as HCl, SO2, and NOX. Usually, the content of these acid gases in the incineration flue gas ranges from several hundred to several thousand milligrams per cubic meter (standard conditions). If these acid gases are directly discharged without treatment, they will cause harm to humans and their living environment. In addition, in actual engineering applications, a large amount of untreated acid gas in the incineration flue gas will cause serious corrosion problems in the flue and other equipment in the exhaust gas purification process. Therefore, the absorption of acid gases in the incineration process is an indispensable part of the exhaust gas purification process.

[0003] Generally, the removal of acidic gases in flue gas is mainly achieved through acid-base neutralization reaction. The deacidification process includes wet process, semi-dry process and dry process. The wet deacidification process has high removal efficiency and is widely used, but it also has disadvantages such as complex process, serious equipment corrosion, high operating cost, and easy generation of a large amount of secondary waste liquid; the semi-dry deacidification process is simple and has high acid gas removal efficiency, but this method is highly dependent on dust removal devices such as bag filters, which can easily cause high load and replacement pressure on subsequent dust removal devices such as bag filters, especially in the field of radioactivity. Frequent backflushing and replacement of filter materials will reduce the overall safety of the process, and the additional fly ash mixed with alkaline deacidification agents will increase the treatment and disposal pressure of radioactive waste; the biggest features of the dry deacidification process are: ① No waste liquid is generated, the deacidification product is solid and easy to handle and dispose of; ② The equipment is less corrosive and easy to replace; ③ The process flow is simple, and the cost of equipment investment and maintenance is relatively low; ④ The deacidification equipment is flexible in design and layout. The application of dry deacidification technology will further highlight the advantages of mobile radioactive waste treatment facilities, avoiding the generation of secondary radioactive wastewater and difficulties in operation and maintenance during the waste treatment process.

[0004] At present, the main problems in the application of dry deacidification materials are concentrated on traditional alkaline deacidification materials such as lime, which have small reaction areas, large consumption, short effective absorption time, insufficient reaction, and single application form; the existing high-efficiency deacidification materials are scarce, and there are problems such as single source procurement. Therefore, it is necessary to develop an efficient and low-cost deacidification agent that can be used for the purification of various types of radioactive incineration flue gases to meet the needs of experiments and research. The above problems need to be solved urgently. Summary of the invention

[0005] The invention discloses a preparation method and a molding method of 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 solutions:

[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] The fly ash, slaked lime and calcium sulfate are uniformly mixed to obtain a mixed raw material, wherein the weight ratio of the fly ash, the slaked lime and the calcium sulfate is (1-5): (0.5-2): 1;

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

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

[0011] In the method for preparing the deacidifying agent for purifying incineration flue gas of the present invention, the weight ratio of the water to the mixed raw material 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 time of the hydrothermal reaction is 2 to 12 hours.

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

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

[0016] In a second aspect, the present invention further provides a molding method of a deacidifying agent, wherein the deacidifying agent is prepared by any of the above-mentioned preparation methods, and the molding method comprises the following steps:

[0017] grinding the deacidifying agent to obtain a ground powder;

[0018] mixing the ground powder 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 a constant weight to obtain a highly active honeycomb deacidifying agent.

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

[0021] In the molding method of the present invention, the binder is water, and the weight ratio of the binder 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 by the present invention can achieve the following beneficial effects:

[0024] The present invention mainly provides a preparation method of a deacidifying agent for purifying incineration flue gas. The deacidifying agent is finally prepared by hydrothermal reaction using fly ash, slaked lime and calcium sulfate as raw materials. The deacidifying agent prepared by the present invention has low cost and large specific surface area, and can increase the adsorption speed of acidic gases, thereby improving the deacidification efficiency. The deacidifying agent has a high adsorption capacity, can increase the adsorption time, reduce the replacement frequency of the deacidifying agent, and reduce the harm to operators. The deacidifying agent prepared by the present invention can adsorb and remove multiple acidic gases at the same time. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described in conjunction with the specific embodiments of the present invention. In the description of the present invention, it should be noted that the term "or" is usually used in the sense of including "and / or", unless the content clearly indicates otherwise.

[0026] Unless expressly indicated to the contrary, the numerical parameters in this specification and the appended claims may be approximate values ​​and can be changed according to the desired properties obtained by the content of the present invention. Specifically, all numbers used in the specification and claims to express the content of the composition, reaction conditions, etc., should be understood to be modified by the term "about" in all cases. In general, the meaning of the expression is to include a change of ±10% in some embodiments, a change of ±5% in some embodiments, a change of ±1% in some embodiments, and a change of ±0.5% in some embodiments by a specific number.

[0027] Furthermore, the word "comprising" does not exclude the presence of materials or steps not listed in the claims. Ordinal numbers such as "first", "second", "third" and Arabic numerals, letters, etc. used in the specification and claims to modify corresponding elements or steps do not themselves mean the order of the manufacturing method. The use of these ordinals is only used to make the steps clearly distinguishable.

[0028] In addition, unless the steps are specifically described or must occur in sequence, the order of the above steps is not limited to the above list, and can be changed or rearranged according to the required design. And the above embodiments can be mixed and matched with each other or with other embodiments based on design and reliability considerations, that is, the technical features in different embodiments can be freely combined to form more embodiments.

[0029] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In order to solve the problems existing in the prior art, the embodiments of the present application provide a preparation method and a molding method of a deacidifying agent for purifying incineration flue gas.

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

[0032]

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

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

[0035] The mixed raw material is mixed with water and then added into a hydrothermal reactor for hydrothermal reaction while being stirred to obtain a hydrated slurry. The temperature of the hydrothermal reaction is 90 to 180° C.;

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

[0037] The present invention discloses a method for preparing a deacidifier for purifying incineration flue gas. The method is based on a hydrothermal reaction using fly ash, slaked lime and calcium sulfate as raw materials to finally obtain the prepared deacidifier. The deacidifier prepared by the present invention has low cost and large specific surface area, and can improve the adsorption rate of acidic gases, thereby improving the deacidification efficiency. It also has a high adsorption capacity, which can increase the adsorption time, reduce the replacement frequency of the deacidifier, and reduce harm to operators. The deacidifier prepared by the present invention can simultaneously adsorb and remove multiple acidic gases. In actual operation, the theoretical value of the radioactivity concentration of the high-activity honeycomb deacidifier prepared by the present invention after purifying flue gas is lower than the concentration specified by the exemption standard, so the waste deacidifier can be treated as non-waste.

[0038] Preferably, the weight ratio of water to the mixed raw material is 10:1 to 50:3; within this range, the specific surface area and acid gas adsorption capacity of the prepared deacidifying agent are both better; if the ratio is too low, the reaction is incomplete; if the ratio is too high, the yield is reduced.

[0039] In some preferred embodiments, the temperature of the hydrothermal reaction is 150°C, at which temperature the specific surface area of ​​the prepared deacidifying agent is the largest; at 90-150°C, the specific surface area of ​​the deacidifying agent increases with increasing temperature, and when 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 when the hydrothermal reaction time is greater than 12 hours, the reaction time is too low and the reaction is incomplete, and the reaction time is too high, 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, slaked lime and calcium sulfate is 3:1:1.

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

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

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

[0046] A molding method of a deacidifying agent, wherein the deacidifying agent is prepared by the above-mentioned preparation method, and the molding method comprises the following steps:

[0047] 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 a constant weight to obtain a highly active honeycomb deacidifying agent.

[0048] In some preferred embodiments, the particle size of the ground 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 ground powder is 1.1 to 1.15:1; if the ratio is too low, there is too little binder and it is difficult to shape; if the ratio is too high, there is too much binder and it is also difficult to shape.

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

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

[0052] Specifically, the outer diameter of the mold is Φ50 mm, and the diameter of the circular hole is Φ3 mm; preferably, a plurality of circular holes are arranged at intervals, for example, at an interval of 6 mm.

[0053] Example 1

[0054] 90 g of fly ash, 30 g of slaked lime and 30 g of calcium sulfate were mixed, and 2500 ml of water was added while stirring to obtain a mixed raw material;

[0055] The mixed raw materials were added into a double-layer glass hydrothermal reactor, heated to 150°C for hydrothermal reaction, stirred while reacting (the stirring rod speed was 200 r / min), reacted for 8 hours, and obtained a 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 high-activity deacidifying agent prepared by the high-activity honeycomb deacidifying agent is ground and sieved (100 meshes) to obtain a high-activity deacidifying agent powder;

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

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

[0060] Performance Testing:

[0061] The high-activity honeycomb deacidification agent prepared in the above example was tested for the acid gases (such as HCl, SO 2 , NO) adsorption capacity: Take 300g of the prepared high-activity honeycomb deacidification agent, place it in a deacidification test bench, pass a 60°C mixed gas simulated flue gas into the absorption tube loaded with the high-activity honeycomb deacidification agent, pass the flue gas at the outlet of the absorption tube into the flue gas online monitor, record the outlet flue gas concentration, and calculate the corresponding adsorption capacity.

[0062] After calculation, the specific surface area of ​​the high-activity honeycomb deacidification agent prepared in Example 1 is 76.4 m 2 / g, the adsorption capacity of acidic gases in flue gas is: HCl-210mg / g; SO 2 -35mg / g; NO-2.4mg / g.

[0063] Example 2

[0064] 90 g of fly ash, 30 g of slaked lime and 30 g of calcium sulfate were mixed, and 2500 ml of water was added while stirring to obtain a mixed raw material;

[0065] The mixed raw materials were added into a double-layer glass hydrothermal reactor, heated to 90°C for hydrothermal reaction, stirred while reacting (the stirring rod speed was 200 r / min), and reacted for 8 hours to obtain a 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 high-activity deacidifying agent prepared by the high-activity honeycomb deacidifying agent is ground and sieved (100 meshes) to obtain a high-activity deacidifying agent powder;

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

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

[0070] Performance Test:

[0071] The high-activity honeycomb deacidifier prepared was tested for the acid gases in flue gas (such as HCl, SO 2 , NO) adsorption capacity: Take 300g of the prepared high-activity honeycomb deacidification agent, place it in a deacidification test bench, pass a 60°C mixed gas simulated flue gas into the absorption tube loaded with the high-activity honeycomb deacidification agent, pass the flue gas at the outlet of the absorption tube into the flue gas online monitor, record the outlet flue gas concentration, and calculate the corresponding adsorption capacity.

[0072] After calculation, the specific surface area of ​​the prepared high-activity honeycomb deacidification agent is 38.2m 2 / g, the adsorption capacity of acidic gases in flue gas is: HCl-160mg / g; SO 2 -32mg / g; NO-3.5mg / 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., and the other conditions are the same as those in embodiment 1.

[0075] Performance Test:

[0076] The high-activity honeycomb deacidification agent prepared in the above example was tested for the acid gases (such as HCl, SO 2 , NO) adsorption capacity: Take 300g of the prepared high-activity honeycomb deacidification agent, place it in a deacidification test bench, pass a 60°C mixed gas simulated flue gas into the absorption tube loaded with the high-activity honeycomb deacidification agent, pass the flue gas at the outlet of the absorption tube into the flue gas online monitor, record the outlet flue gas concentration, and calculate the corresponding adsorption capacity.

[0077] The specific surface area of ​​the highly active honeycomb deacidifier is calculated to be 52.7 m 2 / g, the adsorption capacity of acidic gases in flue gas is: HCl-149mg / g; SO 2 -30.7mg / g; NO-2.1mg / g.

[0078] Example 4

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

[0080] Performance Test:

[0081] The high-activity honeycomb deacidification agent prepared in the above example was tested for the acid gases (such as HCl, SO 2 , NO) adsorption capacity: Take 300g of the prepared high-activity honeycomb deacidification agent, place it in a deacidification test bench, pass a 60°C mixed gas simulated flue gas into the absorption tube loaded with the high-activity honeycomb deacidification agent, pass the flue gas at the outlet of the absorption tube into the flue gas online monitor, record the outlet flue gas concentration, and calculate the corresponding adsorption capacity.

[0082] After calculation, the specific surface area of ​​the prepared high-activity honeycomb deacidification agent is 11.2m 2 / g, the adsorption capacity of acidic gases in flue gas is: HCl-105mg / g; SO 2 -20.3mg / g; NO-1.4mg / g.

[0083] Example 5

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

[0085] Performance Test:

[0086] The high-activity honeycomb deacidification agent prepared in the above example was tested for the acid gases (such as HCl, SO 2 , NO) adsorption capacity: Take 300g of the prepared high-activity honeycomb deacidification agent, place it in a deacidification test bench, pass a 60°C mixed gas simulated flue gas into the absorption tube loaded with the high-activity honeycomb deacidification agent, pass the flue gas at the outlet of the absorption tube into the flue gas online monitor, record the outlet flue gas concentration, and calculate the corresponding adsorption capacity.

[0087] After calculation, the specific surface area of ​​the prepared high-activity honeycomb deacidification agent is 7.79m 2 / g, the adsorption capacity of acidic gases in flue gas is: HCl-99mg / g; SO 2 -17.2mg / g; NO-1.26mg / g.

[0088] Example 6

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

[0090] Performance Test:

[0091] The high-activity honeycomb deacidification agent prepared in the above example was tested for the acid gases (such as HCl, SO 2 , NO) adsorption capacity: Take 300g of the prepared high-activity honeycomb deacidification agent, place it in a deacidification test bench, pass a 60°C mixed gas simulated flue gas into the absorption tube loaded with the high-activity honeycomb deacidification agent, pass the flue gas at the outlet of the absorption tube into the flue gas online monitor, record the outlet flue gas concentration, and calculate the corresponding adsorption capacity.

[0092] After calculation, the specific surface area of ​​the highly active honeycomb deacidifier is 15.6m 2 / g, the adsorption capacity of acidic gases in flue gas is: HCl-122mg / g; SO 2 -27.6mg / g; NO-1.6mg / 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, and the other conditions are the same as those in embodiment 1.

[0095] Performance Test:

[0096] The high-activity honeycomb deacidification agent prepared in the above example was tested for the acid gases (such as HCl, SO 2 , NO) adsorption capacity: Take 300g of the prepared high-activity honeycomb deacidification agent, place it in a deacidification test bench, pass a 60°C mixed gas simulated flue gas into the absorption tube loaded with the high-activity honeycomb deacidification agent, pass the flue gas at the outlet of the absorption tube into the flue gas online monitor, record the outlet flue gas concentration, and calculate the corresponding adsorption capacity.

[0097] After calculation, the specific surface area of ​​the prepared high-activity honeycomb deacidification agent is 54.1m 2 / g, the adsorption capacity of acidic gases in flue gas is: HCl-153mg / g; SO 2 -32.1mg / g; NO-2.05mg / g.

[0098] Example 8

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

[0100] Performance Testing:

[0101] The high-activity honeycomb deacidification agent prepared in the above example was tested for the acid gases (such as HCl, SO 2 , NO) adsorption capacity: Take 300g of the prepared high-activity honeycomb deacidification agent, place it in a deacidification test bench, pass a 60°C mixed gas simulated flue gas into the absorption tube loaded with the high-activity honeycomb deacidification agent, pass the flue gas at the outlet of the absorption tube into the flue gas online monitor, record the outlet flue gas concentration, and calculate the corresponding adsorption capacity.

[0102] After calculation, the specific surface area of ​​the prepared high-activity honeycomb deacidification agent is 46.8m 2 / g, the adsorption capacity of acidic gases in flue gas is: HCl-142mg / g; SO 2 -29.33mg / g; NO-2.09mg / g.

[0103] Example 9

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

[0105] Performance Testing:

[0106] The high-activity honeycomb deacidification agent prepared in the above example was tested for the acid gases (such as HCl, SO 2 , NO) adsorption capacity: Take 300g of the prepared high-activity honeycomb deacidification agent, place it in a deacidification test bench, pass a 60°C mixed gas simulated flue gas into the absorption tube loaded with the high-activity honeycomb deacidification agent, pass the flue gas at the outlet of the absorption tube into the flue gas online monitor, record the outlet flue gas concentration, and calculate the corresponding adsorption capacity.

[0107] After calculation, the specific surface area of ​​the highly active honeycomb deacidifier is 57.1m 2 / g, the adsorption capacity of acidic gases in flue gas is: HCl-163.3mg / g; SO 2 -34.53mg / g; NO-2.41mg / g.

[0108] Comparative Example 1

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

[0110] Performance Test:

[0111] The high-activity honeycomb deacidification agent prepared in the above comparative example was tested for the acid gases (such as HCl, SO 2 , NO) adsorption capacity: Take 300g of the prepared high-activity honeycomb deacidification agent, place it in a deacidification test bench, pass a 60°C mixed gas simulated flue gas into the absorption tube loaded with the high-activity honeycomb deacidification agent, pass the flue gas at the outlet of the absorption tube into the flue gas online monitor, record the outlet flue gas concentration, and calculate the corresponding adsorption capacity.

[0112] The specific surface area of ​​the highly active honeycomb deacidifier is calculated to be 12.8 m 2 / g, the adsorption capacity of acidic gases in flue gas is: HCl-116mg / g; SO 2 -23.9mg / g; NO-1.43mg / g.

[0113] Comparative Example 2

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

[0115] Performance Test:

[0116] The high-activity honeycomb deacidification agent prepared in the above comparative example was tested for the acid gases (such as HCl, SO 2 , NO) adsorption capacity: Take 300g of the prepared high-activity honeycomb deacidification agent, place it in a deacidification test bench, pass a 60°C mixed gas simulated flue gas into the absorption tube loaded with the high-activity honeycomb deacidification agent, pass the flue gas at the outlet of the absorption tube into the flue gas online monitor, record the outlet flue gas concentration, and calculate the corresponding adsorption capacity.

[0117] After calculation, the specific surface area of ​​the prepared high-activity honeycomb deacidification agent is 56.6m 2 / g, the adsorption capacity of acidic gases in flue gas is: HCl-155mg / g; SO 2 -34.2mg / g; NO-2.1mg / g.

[0118] Comparative Example 3

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

[0120] Performance Test:

[0121] The high-activity honeycomb deacidification agent prepared in the above comparative example was tested for the acid gases (such as HCl, SO 2 , NO) adsorption capacity: Take 300g of the prepared high-activity honeycomb deacidification agent, place it in a deacidification test bench, pass a 60°C mixed gas simulated flue gas into the absorption tube loaded with the high-activity honeycomb deacidification agent, pass the flue gas at the outlet of the absorption tube into the flue gas online monitor, record the outlet flue gas concentration, and calculate the corresponding adsorption capacity.

[0122] The specific surface area of ​​the highly active honeycomb deacidifier is calculated to be 64.5 m 2 / g, the adsorption capacity of acidic gases in flue gas is: HCl-176mg / g; SO 2 -34.1mg / g; NO-2.38mg / g.

[0123] The embodiments of the present invention are described above, but the present invention is not limited to the above-mentioned specific implementation modes. The above-mentioned specific implementation modes are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, all of which are protected by the present invention.

Claims

1. A method for preparing a deacidifying agent for purifying incineration flue gas, characterized in that: The steps include: The fly ash, slaked lime and calcium sulfate are uniformly mixed to obtain a mixed raw material, wherein the weight ratio of the fly ash, the slaked lime and the calcium sulfate is (1-5): (0.5-2): 1; The mixed raw material is mixed with water and then added into a hydrothermal reactor for hydrothermal reaction while being stirred to obtain a hydrated slurry, wherein the temperature of the hydrothermal reaction is 90 to 180° C.; The hydrated slurry is filtered and dried to constant weight to obtain a deacidifying agent.

2. The method for preparing a deacidifying agent for purifying incineration flue gas according to claim 1, characterized in that: The weight ratio of the water to the mixed raw material is 10:1 to 50:

3.

3. The method for preparing a deacidifying agent for purifying incineration flue gas according to claim 1, characterized in that: The temperature of the hydrothermal reaction is 150°C.

4. The method for preparing a deacidifying agent for purifying incineration flue gas according to claim 1, characterized in that: The hydrothermal reaction time is 2 to 12 hours.

5. The method for preparing a deacidifying agent for purifying incineration flue gas according to claim 1, characterized in that: The hydrothermal reaction time is 8 hours.

6. The method for preparing a deacidifying agent for purifying incineration flue gas according to claim 1, characterized in that: The weight ratio of the fly ash, the slaked lime and the calcium sulfate is 3:1:

1.

7. A molding method of a deacidifying agent, characterized in that: The deacidifying agent is prepared by the preparation method described in any one of claims 1 to 6 above, and the molding method comprises the following steps: grinding the deacidifying agent to obtain a ground powder; mixing the ground powder 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 a constant weight to obtain a highly active honeycomb deacidifying agent.

8. The molding method according to claim 7, characterized in that: The particle size of the ground powder is less than or equal to 100 meshes.

9. The molding method according to claim 7, characterized in that: The binder is water, and the weight ratio of the binder to the grinding powder is 1.1-1.15:

1.

10. The molding method according to claim 7, characterized in that: The drying temperature is 60 degrees Celsius and the drying time is 6 hours.

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