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Chemical looping coupling process for co-production of synthesis gas and hydrogen by in-situ utilization of carbon dioxide

A carbon dioxide and synthesis gas technology, applied in hydrogen/synthesis gas production, inorganic chemistry, chemical instruments and methods, etc., can solve problems such as increasing the difficulty of solid treatment, and achieve the effects of cost saving, great flexibility and improved purity

Pending Publication Date: 2021-05-04
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, simultaneous use of oxygen carriers and CO 2 Adsorbents also add to the difficulty of solids handling

Method used

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  • Chemical looping coupling process for co-production of synthesis gas and hydrogen by in-situ utilization of carbon dioxide
  • Chemical looping coupling process for co-production of synthesis gas and hydrogen by in-situ utilization of carbon dioxide
  • Chemical looping coupling process for co-production of synthesis gas and hydrogen by in-situ utilization of carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] 1) Fuel CH 4 with oxygen carrier Fe 2 o 3 , into a chemical looping combustion reactor R101 with a temperature of 900° C. and a pressure of 1 atm, a methane flow rate of 1 kmol / h, and a feed ratio of oxygen carrier to methane of 4.

[0070] 2) Fuel CH 4 The oxygen carrier FeO from the R101 reactor is passed into the chemical chain reforming reactor R102 with a temperature of 900 ° C and a pressure of 1 atm, and the feed ratio of methane to oxygen carrier is 1.

[0071] 3) CO from the R101 reactor 2 and H 2 O and the oxygen carrier Fe from the R102 reactor are passed into the co-cracking reactor R103 with a temperature of 850 ° C and a pressure of 1 atm, CO 2 The feed ratio to oxygen carrier was 0.4.

[0072] 4) The water vapor and the oxygen carrier FeO from the R103 reactor are passed into the hydrogen production reactor R104 with a temperature of 500° C. and a pressure of 1 atm. The feed ratio of water vapor and oxygen carrier is 1.1.

[0073] 5) Combine the ai...

Embodiment 2

[0076] 1) Fuel CH 4 Fe modified with Na 2 o 3 / Al 2 o 3 The oxygen carrier is fed into the chemical looping combustion reactor R101 with a temperature of 200° C. and a pressure of 12 atm. The flow rate of methane is 1 kmol / h, and the feed ratio of oxygen carrier to methane is 6.

[0077] 2) Fuel CH 4 The oxygen carrier from the R101 reactor is passed into the chemical chain reforming reactor R102 with a temperature of 500° C. and a pressure of 7 atm, and the feed ratio of methane to oxygen carrier is 0.25.

[0078] 3) CO from the R101 reactor 2 and H 2 O and the oxygen carrier from the R102 reactor are passed into the co-cleavage reactor R103 with a temperature of 200 ° C and a pressure of 12 atm, CO 2 The feed ratio to oxygen carrier was 0.11.

[0079] 4) The water vapor and the oxygen carrier from the R103 reactor are passed into the hydrogen production reactor R104 with a temperature of 700° C. and a pressure of 8 atm, and the feed ratio of the water vapor and the o...

Embodiment 3

[0083] 1) Fuel CH 4 with CeO 2 Modified Fe 2 o 3 The oxygen carrier is fed into the chemical looping combustion reactor R101 with a temperature of 500° C. and a pressure of 7 atm. The flow rate of methane is 1 kmol / h, and the feed ratio of oxygen carrier to methane is 1.

[0084] 2) Fuel CH 4 The oxygen carrier from the R101 reactor is passed into the chemical chain reforming reactor R102 with a temperature of 300° C. and a pressure of 12 atm, and the feed ratio of methane to oxygen carrier is 0.75.

[0085] 3) CO from the R101 reactor 2 and H 2 O and the oxygen carrier from the R102 reactor are passed into the co-cracking reactor R103 with a temperature of 800 ° C and a pressure of 8 atm, CO 2 The feed ratio to oxygen carrier was 0.3.

[0086] 4) The water vapor and the oxygen carrier from the R103 reactor are passed into the hydrogen production reactor R104 with a temperature of 200° C. and a pressure of 12 atm, and the feed ratio of the water vapor and the oxygen car...

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Abstract

The invention provides a chemical looping coupling process for co-production of synthesis gas and hydrogen by in-situ utilization of carbon dioxide. The process comprises the following steps that: 1) fuel and an oxygen carrier react to generate CO2 and H2O, and gas and solid are obtained through a gas-solid separator; (2) fuel and the solid obtained in step (1) react to generate synthesis gas, and the solid and the synthesis gas are obtained through a gas-solid separator; 3) the gas obtained in the step 1) and the solid obtained in step 2) are subjected to a cracking reaction to generate synthesis gas, and the solid and the synthesis gas are obtained through the gas-solid separator; (4) water vapor reacts with the solid obtained in step (3) to generate hydrogen, and the solid and the hydrogen are obtained through the gas-solid separator; and (5) air reacts with the solid obtained in step (4) to make the solid oxidized and regenerated, and the solid enters the step (1) to be recycled next time after passing through the gas-solid separator. According to the invention, high-quality synthesis gas and hydrogen can be obtained, zero emission of CO2 can be realized, and CO2 can be converted into synthesis gas.

Description

technical field [0001] The invention relates to the field of chemical chain synthesis gas and hydrogen, in particular to a chemical chain coupling process for in-situ utilization of carbon dioxide to co-produce synthesis gas and hydrogen. Background technique [0002] With the increase of global energy demand and the exploitation of large unconventional natural gas reserves such as coalbed methane, shale gas and combustible ice, the utilization of natural gas has been paid more and more attention. The conversion of natural gas to syngas and hydrogen is very important in the world, because the former is an important raw material for the synthesis of many chemicals and liquid fuels, while the latter is a clean energy source with high energy density. [0003] Steam reforming of methane (SMR, CH 4 +H 2 O=CO+3H 2 ) is a relatively mature technology for converting methane into synthesis gas or hydrogen. However, the H of the generated syngas 2 The / CO molar ratio is 3, which ...

Claims

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Application Information

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IPC IPC(8): C01B3/34C01B3/08C01B3/10C01B3/06
CPCC01B3/34C01B3/08C01B3/10C01B3/063C01B2203/0211C01B2203/1241Y02E60/36
Inventor 朱燕燕杨倩闫明任豪夏雪马晓迅
Owner NORTHWEST UNIV