CN-116407932-B - Absorbing material suitable for capturing low-concentration carbon dioxide, preparation method and application

Abstract

The invention relates to a full-dry carbon dioxide trapping method, which is suitable for trapping and absorbing materials with low concentration carbon dioxide, a preparation method and application. The fully dry material of the alkali metal hydroxide, inorganic fibers and the hardening inhibitor can effectively avoid the negative effects caused by hardening of water vapor and absorbent in flue gas. The dry-wet combination material of the inorganic fiber carrier can reduce environmental pollution, does not corrode equipment, is easy to be absorbed and disposed, and has obvious enhancement in the absorption and utilization rate of CO 2 . The full-dry material has self-adaptive capability for trapping trace CO 2 , is suitable for the fields of trapping low-concentration CO 2 (10 ppm-10000 ppm) such as nuclear power, direct air trapping (DAC) and the like, has simple preparation process and easily obtained raw materials, is suitable for large-scale industrial production, and is easy to process the absorbed product.

Inventors

• CHENG JINPING
• ZENG QINGRUI
• LONG MINGCE
• Gong Youyun
• SONG YINGYANG
• WAN WENJIE
• NI QIGUO
• ZHOU XINRUI
• MIAO MIN

Assignees

• 上海交通大学
• 苏州煦骅自动化设备有限公司

Dates

Publication Date

20260508

Application Date

20230307

Claims (9)

1. 1. The absorbing material is characterized by comprising the following components of A silicate fiber material, B alkali metal hydroxide and C hardening inhibitor, wherein the concentration of the low-concentration carbon dioxide is 10ppm-10000ppm correspondingly, and the component C is selected from alumina or silica pellets, and the particle size range is 0.1mm-6.0mm.
2. 2. The absorbent material for capturing low-concentration carbon dioxide according to claim 1, wherein the mass fraction of the component A is 15-35%, the mass fraction of the component B is 30-55%, and the mass fraction of the component C is 20-35% based on the total weight of the absorbent.
3. 3. The absorbent material for low concentration carbon dioxide capture as claimed in claim 1, The component A is selected from one or more of aluminum silicate fiber, crystalline aluminum oxide fiber and polycrystalline mullite fiber.
4. 4. The absorbent material for low concentration carbon dioxide trapping of claim 3, wherein said aluminum silicate fibers comprise plain aluminum silicate fibers, high aluminum silicate fibers, aluminum silicate fibers containing Cr 2 O 3 ,ZrO 2 or B 2 O 3 .
5. 5. The absorbent material for low concentration carbon dioxide capture of claim 1, wherein component B is selected from one or more of potassium hydroxide, sodium hydroxide, magnesium hydroxide, calcium hydroxide.
6. 6. A method for the preparation of an absorbent material suitable for low concentration carbon dioxide capture according to any one of claims 1 to 5, characterized in that the method comprises the steps of: Step I, determining the dosage of the component A aluminum silicate inorganic fiber material carrier according to the sizes of absorption columns with different sizes, and blending and cutting; step II, adding the component A into the component B, and stirring at normal temperature to obtain a solid mixture D; and III, mixing the solid mixture D with the component C anti-hardening agent to obtain the absorbing material.
7. 7. A method of operational use of an absorbent material suitable for low concentration carbon dioxide capture according to any one of claims 1-5, the method comprising the steps of: Step 1, placing the absorbing material in an absorbing column with an adaptive size and fixing the absorbing material by a fixer; step 2, flushing the fixed absorption column and the fixed material in the absorption column by using N 2 ; And 3, carrying out absorption reaction on low-concentration CO 2 gas containing a certain flow rate by the absorption column and the absorption material at normal temperature and normal pressure.
8. 8. The method of claim 7, wherein the low concentration CO 2 absorption by the absorbent is performed at ambient temperature without additional heating or cooling.
9. 9. Use of an absorbent material according to any one of claims 1-5 for low concentration carbon dioxide capture in nuclear power plant exhaust carbon dioxide capture.

Description

Absorbing material suitable for capturing low-concentration carbon dioxide, preparation method and application Technical Field The invention belongs to the field of gas separation, and particularly relates to an absorption material suitable for capturing low-concentration carbon dioxide (10 ppm-10000 ppm), a preparation method and application thereof. Background The conventional CO 2 emission reduction scheme is a comprehensive utilization technology (CCUS) of CO 2 capture and sequestration, namely CO 2 capture, CO 2 utilization and CO 2 sequestration, and is generally common in independent technologies and technology combination of the three technologies. The CO 2 capturing method can be generally classified into a dry absorption method and a wet absorption method according to the application scenario and the pressure of the raw gas. The dry absorption method generally comprises an absorption method and a membrane method, is generally suitable for the situation that the concentration of the raw material gas CO 2 is low, and can be divided into a chemical absorption method and a physical absorption method, wherein the chemical absorption method is mainly used for the situation that the concentration of the raw material gas CO 2 is high, and the pressure is low or normal pressure. The main emission form of CO 2 at present is 14CO2 generated after 14CH4 catalytic oxidation in nuclear power, the concentration is basically lower than 10ppm, and the emission amount is small, but the environment is still possibly influenced. The existing pure dry absorption method has the problems of low alkali utilization efficiency, short breakthrough time and the like under the discharge environment of nuclear power 14CO2, and the problems of large occupied area, difficult treatment of absorbed products and the like due to the adoption of a pure wet absorption method. The method adopts the aluminum silicate inorganic fiber cotton as the carrier, and the carrier has proper pores, can well disperse the solid alkali metal hydroxide, can achieve good hardening prevention effect by mixing with the hardening prevention agent, and has the advantage of small occupied space of a pure dry absorption method. The products are mainly inorganic carbonates, are inorganic matters, and meet the requirements of nuclear power harmless treatment. Disclosure of Invention The invention aims at providing an absorbing material suitable for capturing low-concentration carbon dioxide (10 ppm-10000 ppm) aiming at nuclear power 14CO2 to emit low-concentration (10 ppm) and high-humidity (100%), and a preparation method and application thereof. The method can effectively solve the problems that the occupied area is large, the product after absorption is difficult to treat and the like in the pure wet absorption method under the high-humidity environment during the absorption reaction of low-concentration CO 2 in the nuclear power field. The aim of the invention is realized by the following technical scheme: in a first aspect, the invention provides an absorbing material suitable for capturing low-concentration carbon dioxide, which comprises the following components of A at least one of silicate fiber material and alumina fiber material, B alkali metal hydroxide and C hardening inhibitor. The corresponding concentration of the low-concentration carbon dioxide is 10ppm-10000ppm. As one embodiment, the mass fraction of the component A is 15-35%, the mass fraction of the component B is 30-55%, and the mass fraction of the component C is 20-35% based on the total weight of the absorbent material. As one embodiment, component a is selected from one or more of aluminum silicate fibers, crystalline aluminum oxide fibers, and polycrystalline mullite fibers. As one embodiment, the aluminum silicate fibers include ordinary aluminum silicate fibers, high aluminum silicate fibers, aluminum silicate fibers containing Cr 2O2,ZrO2 or B 2O3. As an embodiment, component B is selected from one or more of potassium hydroxide, sodium hydroxide, magnesium hydroxide, calcium hydroxide. As an embodiment, component C is selected from alumina or silica pellets having a particle size in the range of from 0.1mm to 6.0 mm. As an embodiment, the absorption material can perform the low concentration CO2 absorption reaction at normal temperature without additional heating or cooling conditions. In a second aspect, the invention provides a method for preparing the absorbent material suitable for capturing low-concentration carbon dioxide (10 ppm-10000 ppm), comprising the following implementation steps: Step I, determining the dosage of the component A aluminum silicate inorganic fiber material carrier according to the sizes of absorption columns with different sizes, and blending and cutting; step II, adding the component A into the component B, and stirring at normal temperature to obtain a solid mixture D; and III, mixing the solid mixture D with the component C anti-hardening agent t