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A calcium-copper combined chemical cycle method

A calcium cycle and chemical technology, applied in the field of biomass/steam gasification hydrogen production, can solve the problems of oxygen-carrying capacity obstruction, rapid decline, absorption capacity obstruction, etc., to maintain cycle absorption capacity, improve operating efficiency, and reduce oxidation Effect

Inactive Publication Date: 2018-03-06
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In the above system, since the calcium material and copper material need to go through three processes of calcination regeneration, oxidation, and carbonation, continuous recycling will cause CaL-CLC to be used to capture CO in flue gas. 2 When the CO of CaO 2 The absorption capacity is hindered by copper materials and drops rapidly; when CaL-CLC is applied to hydrogen production, the oxygen carrying capacity of copper is affected by CaCO 3 hindrance, and CaCO 3 The existence of will limit the maximum temperature of the oxidation process, thus greatly reducing the operating efficiency of the system

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  • A calcium-copper combined chemical cycle method
  • A calcium-copper combined chemical cycle method
  • A calcium-copper combined chemical cycle method

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Embodiment 1

[0030] Calcium-copper combined chemical cycle method applied to post-combustion CO 2 Capture, i.e. capturing CO from flue gas 2 The basic operation process is as follows figure 2 shown, including:

[0031] 1) In the carbonation reactor, CaO absorbs CO through the carbonation process 2 , converted to CaCO 3 ; 2) CaCO generated 3 The CuO generated in the oxidation reactor is mixed with solid-solid mixing equipment to achieve relatively uniform particle mixing; 3) In the calcination regeneration reactor, CuO undergoes a redox reaction with the gas fuel and releases heat. Under the heating of CuO exothermic reaction, CaCO 3 Decomposes to generate CaO and CO 2 . Since the gas composition in the calcination regenerative reactor is mainly CO 2 and water vapor (gas fuel is CH 4 , the reaction gas product is CO 2 and water vapor; when the gaseous fuel is CO, the reaction gas product is CO 2 ; The gas fuel is H 2 , the reaction gas product is water vapor), through the conde...

Embodiment 2

[0033] The basic operation process of calcium-copper combined chemical cycle method applied to methane / steam reforming hydrogen production and biomass / steam gasification hydrogen production is as follows: image 3 shown, including:

[0034] 1) In the carbonation reactor (also called gasification reactor in this application), CH 4 Reforming reaction with water vapor under the action of catalyst to generate H 2 and CO, the generated CO undergoes a water-gas shift with water vapor to obtain H 2 and CO 2 . At the same time, CaO in the same reactor absorbs CO through the process of carbonation 2 , so as to promote the reforming hydrogen production process in the positive direction and increase the CH 4 The conversion efficiency of (biomass / steam gasification hydrogen production process is similar); 2) the generated CaCO 3 It is mixed with CuO generated in the oxidation reactor through solid-solid mixing equipment and then enters the calcination regeneration reactor. In the c...

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Abstract

The invention provides a novel calcium-copper combined chemical cycling (CaL-CLC) method which mainly comprises three steps of carbonation, calcinated regeneration, and oxidation. A calcium material is subjected to calcium cycling in the processes of calcinated regeneration and carbonation, and a copper material is subjected to chemical chain cycling in the processes of calcinated regeneration and oxidation, and the two kinds of cycling are intersected in the process of calcinated regeneration, so that the reduced heat release of cupric oxide is realized so as to provide energy for the decomposition of calcium carbonate. The method disclosed by the invention can be used for solving the problems that in the process of existing calcium-copper combined chemical cycling, calcium-copper components are interacted so as to inhibit the reaction activity of the materials, and the maximum operating temperature of an oxidation reactor is limited by the decomposition temperature of calcium carbonate when the CaL-CLC is applied to hydrogen production, so that the overall efficiency of calcium-copper chemical cycling can be effectively improved and the operation cost can be reduced.

Description

technical field [0001] The invention relates to a calcium-copper combined chemical cycle method, which is mainly suitable for post-combustion CO 2 capture, methane / steam reforming and biomass / steam gasification for hydrogen production. Background technique [0002] CO emissions from human activities 2 , is considered to be the main factor causing global warming. According to research, CO in the atmosphere 2 Concentrations have increased from 280ppm before the industrial revolution to 390ppm in 2012, and are rising at an even faster rate. In order to prevent the further deterioration of the climate problem, it is necessary to strictly control the CO 2 emissions. The use of fossil fuels, especially their combustion in the production of electricity is CO 2 The most important contributor to industrial emissions, so research on new and efficient CO 2 Emission reduction technologies are of great significance for mitigating global warming. [0003] Calcium looping (CaL) is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/81B01D53/62C01B3/32C01B3/36C10J3/00
CPCY02C20/40Y02P20/151
Inventor 秦昌雷冉景煜张力
Owner CHONGQING UNIV