US-20260125607-A1 - METHOD FOR COMBINED THERMAL CONVERSION OF STRAW BRIQUETTE FUEL AND CARBON DIOXIDE

Abstract

A method for synergistic thermal conversion of straw briquette fuel and carbon dioxide is disclosed. The method includes placing a nickel-based catalyst in the gasifier chamber, maintain the temperature inside the gasifier chamber at 810-960° C., introducing straw briquette fuel into the gasifier chamber, and set the reaction time to 60 minutes. According to different reaction temperatures, no carbon dioxide is introduced from 0 to 10 min, and the amount of carbon dioxide introduced into the gasifier from 5 to 10 min is 0.016-to-0.04-unit weight/min, and the amount of carbon dioxide introduced into the gasifier from 14 to 60 min is 0.012-to-0.03-unit weight/min. After the reaction is completed, the reacted slag is removed or filtered out, the straw briquette fuel is re-added, and timing is started.

Inventors

• Zhiwei Wang
• Zhimin Du
• Zhengjun Wu
• Junting ZHAO
• Mengge WU
• Shuaihua GUO
• Yan Chen
• Tingzhou LEl
• Gaofeng Chen
• Youjian ZHU
• Qun Wang
• Huina ZHU
• Tiantian LI
• Hui Li
• Qiaochong HE

Assignees

• HENAN UNIVERSITY OF TECHNOLOGY

Dates

Publication Date

20260507

Application Date

20221027

Priority Date

20211028

Claims (9)

1. 1 . A method for synergistic thermal conversion of straw briquette fuel and carbon dioxide, characterized in that the method comprises placing a nickel-based catalyst and a straw briquette fuel in a gasifier, maintaining a reaction temperature in the gasifier at 810-960° C., setting a reaction time, no carbon dioxide being introduced in 0-10 min, carbon dioxide being introduced into the gasifier at 0.016-0.04 unit weight/min in 5-10 min, carbon dioxide being introduced into the gasifier at 0.012-0.03 unit weight/min in 14-60 min, extracting gas from the gasifier during this period.
2. 2 . The method for synergistic thermal conversion of straw briquette fuel and carbon dioxide according to claim 1 , characterized in that the reaction time is set to 50-60 min.
3. 3 . The method for synergistic thermal conversion of straw briquette fuel and carbon dioxide according to claim 1 , characterized in that no carbon dioxide is introduced from 0 to 10 min, and the carbon dioxide introduced into the gasifier is 0.025 to 0.03 unit weight/min from 5 to 10 min, and the amount of carbon dioxide introduced into the gasifier from 14 to 60 min is 0.018 to 0.025 unit weight/min.
4. 4 . The method for synergistic thermal conversion of straw briquette fuel and carbon dioxide according to claim 2 , characterized in that when the temperature in the gasification furnace body is maintained at 810° C., carbon dioxide is not introduced from 0 to 10 min, the carbon dioxide introduced into the gasifier from 11 to 20 min is 0.016 unit weight/min, the amount of carbon dioxide introduced into the gasifier from 21 to 60 min is 0.012 unit weight/min; When the temperature in the gasifier is maintained at 860° C., no carbon dioxide is introduced from 0 to 8 min, and the carbon oxide introduced into the gasifier from 9 to 18 min is 0.022 unit weight/min, the carbon dioxide introduced into the gasifier from 19 to 60 min is 0.017 unit weight/min; when the temperature in the gasifier body is maintained at 910° C., no carbon dioxide is introduced from 0 to 6 min, and the carbon dioxide introduced into the gasifier from 7 to 16 min is 0.031 unit weight/min, the carbon dioxide introduced into the gasifier is 0.023 unit weight/min from 17 to 60 min; when the temperature in the gasifier is maintained at 960° C., no carbon dioxide is introduced from 0 to 4 min, and the carbon dioxide introduced into the gasifier from 5 to 13 min is 0.040 unit weight/min, the carbon dioxide introduced into the gasifier is 0.030 unit weight/min from 14 to 60 min.
5. 5 . The method for synergistic thermal conversion of straw briquette fuel and carbon dioxide according to claim 1 , characterized in that the gas in the gasification furnace body is extracted to the gas storage device through a Roots blower.
6. 6 . The method for synergistic thermal conversion of straw briquette fuel and carbon dioxide according to claim 1 , characterized in that an original mass ratio of the straw briquette to a nickel-based catalyst is 3:1-1:1.
7. 7 . The method for synergistic thermal conversion of straw briquette fuel and carbon dioxide according to claim 1 , characterized in that the straw briquette fuel is selected from one or more of corn straw briquette fuel, wheat straw briquette fuel, and rice straw briquette fuel.
8. 8 . The method for synergistic thermal conversion of straw briquette fuel and carbon dioxide according to claim 1 , characterized in that after the reaction is completed, the slag after the reaction is removed or filtered out, and the straw briquette fuel is added again, and the reaction operation process is repeated until the reaction is completed.
9. 9 . The method for synergistic thermal conversion of straw briquette fuel and carbon dioxide according to claim 8 , characterized in that the cycle is performed more than 2 times to achieve synergistic conversion of straw briquette fuel and carbon dioxide, generating high-quality combustible gas while fixing carbon dioxide.

Description

TECHNICAL FIELD This invention belongs to the technical field of comprehensive utilization of biomass energy and carbon dioxide, and particularly relates to a method for synergistic thermal conversion of straw briquette fuel and carbon dioxide. BACKGROUND TECHNOLOGY China's annual agricultural straw production is very abundant, with an annual output of 800 to 900 million tons. In addition to being partially used for papermaking and livestock feed, about 350 million tons can be used as energy, equivalent to about 180 million tons of standard coal, which is a huge number of resources. However, agricultural straw has shortcomings such as dispersed resources, low energy density, small bulk density, and inconvenient storage and transportation, which seriously restrict its large-scale application. With the increase in people's income, commodity energy (such as coal, liquefied petroleum gas, etc.) has become their main cooking energy in rural areas that are relatively close to commodity energy production areas. As a result, agricultural straw used in traditional ways can first become the object of replacement. They are discarded in the fields as organic solid waste, and some are burned at will. This not only wastes precious renewable resources, but also seriously pollutes the atmosphere and harms the human living environment. Agricultural straw briquette fuel technology can compress agricultural straw into briquette fuel with a fixed shape and high density through drying, crushing, molding and other processes, which are originally dispersed and have no certain shape, thereby saving transportation and storage costs and expanding the scope of application, improving utilization efficiency ([1] Wang Zhiwei, Lei Tingzhou, Yue Feng, Yang Shuhua, Li Zaifeng, He Xiaofeng, Zhu Jinling. Economy analysis of crop straw briquetting system. Journal of Agricultural Mechanization Research, 2012; 34 (2): 203-206. [2] Wang Zhiwei, Li Zaifeng, Lei Tingzhou, Zhu Jinling, Yang Shuhua, He Xiaofeng, Yue Zenghe. Integration and automation design of biomass briquetting fuel system. Renewable Energy Resources, 2011; 2 (4): 132-135. [3] Wang Zhiwei, Chang Xia, Lei Tingzhou, Li Zaifeng, Xin Xiaofei, Zhao Baozhu, Yang Shuhua, Yu Xianjing, Wu Yifeng, He Xiaofeng, Zhu Jinling. A briquette fuel with a flat mold molding mold. Invention patent, China, ZL2015100746651). China has released and implemented the relevant industry standards ([4] Specification for densified biofuel, NY/T 1878-2010) and local standards that have strongly promoted the promotion and application of straw briquette fuel ([5] Basic requirements for clean utilization of straw briquette fuel, DB34/T 3656-2020). Gasification or pyrolysis of straw briquette fuel is a process that converts the hydrocarbons that make up the straw briquette fuel into combustible gases such as carbon monoxide and hydrogen under certain thermodynamic conditions. The gasification of straw briquette fuel generally uses gases such as nitrogen, argon, helium, air, water vapor, or a mixture of these gases to convert the agricultural straw briquette fuel into combustible gases such as carbon monoxide, hydrogen, and methane through thermochemical reactions ([6] Zhang Weijie, Guan Haibin, Jiang Jianguo, Sun Rongfeng, Fan Xiaoxu, Yang Liguo, Liu Zuo, Hu Safe. Gasification experiment of straw briquette fuel in a compound fixed bed. Shandong Science. 2017; 30 (4): 67-72). The pyrolysis of the straw briquette fuel is generally heated under the condition of separation of the gas to transform straw briquette fuel into low-molecular combustible gas ([7] Wang Zhiwei, He Xiaofeng, Zhao Baozhu, Bai Wei, Zhu Jinling, Lei Tingzhou. Experimental study of utilization system on biomass pyrolysis. Journal of Agricultural Mechanization Research, 2009; 31 (3): 150-153). Straw briquette fuel is different from fossil fuels such as coal. It contains hydrocarbons and also contains more oxygen. Therefore, when heating straw briquette fuel at high temperature, the oxygen-containing bond is broken and gases containing carbon dioxide is generated. After the pyrolysis continues for a certain period of time, the oxygen element is exhausted. At this time, the volatile component can be further cracking under the conditions of air, oxygen, water vapor and other atmosphere gas ([8] Wang Shurong, Luo Zhongzheng. Pyrolysis of biomass components. Beijing: Science Press, 2013). In addition, adding catalysts can promote further deep cracking reactions of volatile component and hydrocarbons during biomass thermal conversion, and generate combustible gas with a smaller molecular weight, thereby reducing the generation of tar, increasing gasification efficiency of straw briquette fuel, increasing heat value of combustible gas, and increasing energy conversion rate. The efficient and reasonable use of carbon dioxide is an important strategy to reduce the greenhouse gas and achieve carbon neutrality. In the process of pyrolysis and thermal conversion