Method and device for preparing synthesis gas and capturing and utilizing carbon dioxide

A technology of carbon dioxide and synthesis gas, applied in hydrogen/synthesis gas production, chemical instruments and methods, petrochemical industry, etc., to achieve the effect of reducing energy consumption demand

Active Publication Date: 2017-07-28
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the partial oxidation reforming of methane needs to strictly control the feeding ratio and operating conditions to prevent CH 4 fully oxidized, and at the same time, to prevent N in the air 2 Diluted product stream, methane partial oxidation reforming requires pure oxygen, i.e. expensive air separation unit

Method used

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  • Method and device for preparing synthesis gas and capturing and utilizing carbon dioxide
  • Method and device for preparing synthesis gas and capturing and utilizing carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This example provides a synergistic capture and utilization of flue gas CO 2 The device and method, respectively with CaO and Fe as CO 2 Carrier and O 2 Carrier as an example, the specific process is as follows: To CO 2 A stream of dry flue gas from a 600MWe coal-fired power station is fed into the trap, the gas flow rate is 1 kmol / s, and the gas content is: 15% CO 2 , 5% O 2 and 80% N 2 . The solid component is the solid component after gas-solid separation from the fuel reactor, Fe feed is 0.80 kmol / s, CaO feed is 0.15 kmol / s, CO 2 The capture reactor temperature was 400 °C and the operating pressure was ~1 atm. The air feed to the oxidation reactor is 3.33 kmol / s, and the solid feed is the solid component separated by the first separator, in order to prevent CaCO 3 For decomposition, the oxidation reactor temperature is 600 °C and the operating pressure is ~1 atm. Reforming reactor CH 4 The feed rate is 1.70 kmol / s, the solid feed is the solid component sepa...

Embodiment 2

[0041] This example provides a synergistic capture and utilization of flue gas CO 2 The device and method, respectively with CaO and Ni as CO 2 Carrier and O 2 Carrier as an example, the specific process is as follows: To CO 2 A stream of dry flue gas from a 600MWe coal-fired power station is fed into the trap, the gas flow rate is 1 kmol / s, and the gas content is: 15% CO 2 , 5% O 2 and 80%N 2 . The solid component is the solid component after gas-solid separation from the reforming reactor, the feed rate of Ni is 0.20 kmol / s, the feed rate of CaO is 0.15 kmol / s, and the CO 2 The capture reactor temperature was 100 °C and the operating pressure was ~1 atm. The air feed to the oxidation reactor was 0.05 kmol / s O 2 and 0.19 kmol / s N 2 , the solid feed is the solid component separated by the first separator, in order to prevent CaCO 3 For decomposition, the oxidation reactor temperature is 600 °C and the operating pressure is ~1 atm. fuel reactor CH 4 The feed rate is ...

Embodiment 3

[0043] In this example, HSC 5.0 is used to study different oxygen carriers and different CO 2 The enthalpy change of the three reactors for co-reforming methane with the carrier was used to explore the total enthalpy change of the three reactors. CaCO 3 -CoO-CH 4 Combination as an example: the molar feed ratio is 1:1:1, in CO 2 The following reactions take place in the capture reactor:

[0044] CaO + CO 2 (g) = CaCO 3 ……(1)

[0045] The following reactions take place in the oxidation reactor:

[0046] Co + O 2 (g) = 1 / 2CoO...(2)

[0047] The following reactions take place in the reforming reactor:

[0048] CaCO 3 + CoO + CH 4 (g) = 2CO(g) + H 2 (g) + Co + CaO +H 2 O(g)...(3)

[0049] CO 2 Capture reactor operating temperature T 1 = 400°C, △H 1 = -174.391 kJ (where, T 1 、△H 1 The subscript of means the reaction in the first step, and applies to the second and third steps by analogy); in the oxidation reactor, in order to prevent CaCO 3 Decompose, and at t...

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Abstract

The invention relates to a method and device for preparing a synthesis gas and capturing and utilizing carbon dioxide. The method for preparing the synthesis gas is mixing a carbonated carbon dioxide carrier and an oxidation-state oxygen carrier with methane to be subjected to a reforming reaction, and then obtaining a gas, namely the synthesis gas, after the reforming reaction. The method for capturing and utilizing carbon dioxide is using the carbon dioxide carrier for capturing carbon dioxide in the gas to obtain the carbonated carbon dioxide carrier, taking the carbonated carbon dioxide carrier as a raw material, and then preparing the synthesis gas by using the method for preparing the synthesis gas. The method not only can realize the low-energy consumption reforming reaction, but also can realize the utilization of a carbon dioxide waste gas.

Description

technical field [0001] The present invention relates to a method and device for producing synthesis gas and capturing and utilizing carbon dioxide. Background technique [0002] The increasing population and the development of existing technologies create an ever-increasing demand for energy. There are many problems in traditional energy utilization, such as the increasingly significant impact of the "greenhouse effect" on CO 2 The capture and utilization of resources is urgent. Conventional CO 2 Capture includes pre-combustion capture, post-combustion capture, oxygen-enriched combustion and other processes. The presence of nitrogen captured after combustion is not easy to combine with CO 2 The problem of separation, the pre-combustion capture involves shift reaction hydrogen production, the initial fuel conversion step is relatively complicated, the system cost is high, the oxygen-enriched combustion process needs to pass through pure oxygen reaction, and the expensive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/50C01B3/36
CPCC01B3/363C01B2203/0222C01B2203/0255Y02P30/00
Inventor 金波赵芸蕾梁志武
Owner HUNAN UNIV
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