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.

Claims

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. 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. 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. 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. 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. 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. 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. 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. 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

DETAILED IMPLEMENTATION

[0014] The technical solutions of this invention are described below with specific examples, but the protection scope of this invention is not limited thereto:

[0015] The reaction temperatures selected in Examples 1 to 4 are 810 C., 860 C., 910 C., and 960 C. respectively, and the selected straw briquette fuel are cornstraw briquette fuel.

Example 1

[0016] Put a unit weight (such as 100 kg) of nickel-based catalyst (Ni/Al.sub.2O.sub.3) in the biomass gasifier, keep the temperature inside the gasifier at 810 C., and add corn straw briquette fuel that is twice the weight of the catalyst (such as 200 kg). Set the reaction time to 60 min, in which no carbon dioxide is introduced from 0 to 10 min, the carbon dioxide introduced into the gasifier from 11 to 20 min is 0.016 unit weight/min, and the carbon dioxide introduced into the gasifier from 21 to 60 min is 0.012 unit weight/min. The gas in the gasifier body is extracted to the gas storage device through a Roots blower. After 60 min, remove or filter the slag after the reaction, and re-add corn straw briquette fuel 1 to 3 times the weight of the catalyst. Start timing and proceed according to the above carbon dioxide flow rate and time until 60 minutes. The above steps are carried out in a loop.

Example 2

[0017] Put a unit weight (such as 100 kg) of nickel-based catalyst (Ni/Al.sub.2O.sub.3) in the biomass gasifier, keep the temperature inside the gasifier at 860 C., and add corn straw briquette fuel that is twice the weight of the catalyst (such as 200 kg). Set the reaction time to 60 minutes, in which no carbon dioxide is introduced from 0 to 8 min, the carbon dioxide introduced into the gasifier body from 9 to 18 min is 0.022 unit weight/min, and the carbon dioxide introduced into the gasifier body from 19 to 60 min is 0.017 unit weight/min. The gas in the gasifier body is extracted to the gas storage device through a Roots blower. After 60 min, remove or filter the slag after the reaction, and re-add corn straw briquette fuel 1 to 3 times the weight of the catalyst. Start timing and proceed according to the above carbon dioxide flow rate and time until 60 minutes. The above steps are carried out in a loop.

Example 3

[0018] Put a unit weight (such as 100 kg) of nickel-based catalyst (Ni/Al.sub.2O.sub.3) in the biomass gasifier, keep the temperature inside the gasifier at 910 C., and add corn straw briquette fuel that is twice the weight of the catalyst (such as 200 kg). Set the reaction time to 60 minutes, in which no carbon dioxide is introduced from 0 to 6 min, the carbon dioxide introduced into the gasifier body from 7 to 16 min is 0.031 unit weight/min, and the carbon dioxide introduced into the gasifier body from 17 to 60 min is 0.023 unit weight/min. The gas in the gasifier body is extracted to the gas storage device through a Roots blower. After 60 min, remove or filter the slag after the reaction, and re-add corn straw briquette fuel 1 to 3 times the weight of the catalyst. Start timing and proceed according to the above carbon dioxide flow rate and time until 60 minutes. The above steps are carried out in a loop.

Example 4

[0019] Put a unit weight (such as 100 kg) of nickel-based catalyst (Ni/Al.sub.2O.sub.3) in the biomass gasifier, keep the temperature inside the gasifier at 960 C., and add corn straw briquette fuel that is twice the weight of the catalyst (such as 200 kg). Set the reaction time to 60 minutes, in which no carbon dioxide is introduced from 0 to 4 min, the carbon dioxide introduced into the gasifier body from 5 to 13 min is 0.040 unit weight/min, and the carbon dioxide introduced into the gasifier body from 14 to 60 min is 0.030 unit weight/min. The gas in the gasifier body is extracted to the gas storage device through a Roots blower. After 60 min, remove or filter the slag after the reaction, and re-add corn straw briquette fuel 1 to 3 times the weight of the catalyst. Start timing and proceed according to the above carbon dioxide flow rate and time until 60 minutes. The above steps are carried out in a loop.

[0020] Table 1 shows the amount of combustible gas components generated and carbon dioxide consumption within a reaction time of 60 minutes in Examples 1 to 4:

TABLE-US-00001 TABLE 1 The ratio of the generation amount of combustible gas components and the fixed amount of carbon dioxide to 1 unit weight of corn straw briquette fuel Item Example 1 Example 2 Example 3 Example 4 CO generation amount 0.68 0.93 1.21 1.83 H.sub.2 generation amount 0.011 0.014 0.019 0.030 CH.sub.4 generation amount 0.072 0.071 0.070 0.069 C.sub.2-C.sub.3 generation amount 0.041 0.038 0.035 0.032 CO.sub.2 consumption 0.29 0.55 0.96 1.27

[0021] It can be seen from Table 1 that under the conditions of 810 C., 860 C., 910 C., and 960 C., 1 unit weight of corn straw briquette fuel can produce approximately 0.68 to 1.83 unit weight of carbon monoxide, about 0.011 to 0.030 unit weight of hydrogen, about 0.069 to 0.072 unit weight of methane, and about 0.032 to 0.041 unit weight of low carbon chain hydrocarbon gas. At the same time, it can consume approximately 0.29 to 1.27 unit weigh of carbon dioxide.