Carbon dioxide separation/recovery device, combustion system using same, thermal power generation system using same, and method for separating and recovering carbon dioxide

A carbon dioxide, separation and recovery technology, applied in separation methods, chemical instruments and methods, filtration and separation, etc., can solve problems such as performance degradation of capture materials, and achieve the effect of inhibiting performance degradation and reducing operating costs.

Inactive Publication Date: 2018-08-31
HITACHI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Nitrogen oxides (NOx) and sulfur oxides (SOx) are contained in combustion exhaust gas from thermal power plants, etc., and these gases may be adsorbed on or absorbed by the capture material to degrade the performance of the capture material

Method used

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  • Carbon dioxide separation/recovery device, combustion system using same, thermal power generation system using same, and method for separating and recovering carbon dioxide
  • Carbon dioxide separation/recovery device, combustion system using same, thermal power generation system using same, and method for separating and recovering carbon dioxide
  • Carbon dioxide separation/recovery device, combustion system using same, thermal power generation system using same, and method for separating and recovering carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] (NOx adsorption test)

[0065] Regarding the inclusion of H along with NOx 2 O and CO 2 The NOx adsorption characteristics in either or both of them were evaluated by the following method. as CO2 Capture material, high specific surface area CeO made of the first dilute element 2 .

[0066] About CO 2 The capture material is granulated by a press machine at 200kgf using a die with a diameter of 40mm, crushed, and then sized into 0.5-1.0mm granules using a sieve. Then, 20.0 ml was measured using a graduated cylinder, and it fixed in the reaction tube made of stainless steel. while using N 2 The gas was circulated at 2.0 L / min, and the temperature was raised to 200° C. using an electric furnace and held there for 1 hour to remove impurities and gas adsorbed on the capture material. Then, the CO 2 The temperature of the capture material was cooled to 50°C, and the outlet NOx concentration was measured under 4 conditions with different compositions of the flowing gas...

Embodiment 2

[0089] Figure 3A shows the use of CO shown in Example 1 2 The characteristics of the capture material, the separation and recovery of CO from the combustion exhaust gas of the boiler of the thermal power plant 2 The composition of the device. Typically, combustion exhaust gases contain nitrogen oxides and carbon dioxide. Combustion exhaust gas is also called gas to be processed.

[0090] In this figure, in addition to CO 2 In addition to the separation and recovery device 101, a boiler 11, an exhaust gas purification device 12, a low-pressure turbine 13 and a condenser 14 of a thermal power plant are also shown. in CO 2 The capture container of the separation and recovery device 101 contains CO 2 Capture materials. This constitutes CO 2 capture unit.

[0091] The combustion exhaust gas discharged from the boiler 11 is transported to the CO 2 Separation recovery device 101. in CO 2 In the separation and recovery unit 101, CO is removed 2 After removing the CO 2 g...

Embodiment 3

[0107] Figure 4 shows the CO in the present invention 2 In the separation and recovery unit, it is used to suppress CO 2 The structure of NOx desorption in the desorption process.

[0108] In addition to CO 2 The configuration other than the detachment step is the same as that shown in the second embodiment.

[0109] In this example, the recovered CO as the heating gas 2 circulates in the capture container 151 . The gas discharged from the capture container 151 (heated gas, desorbed from CO 2 and out of H 2 O mixed gas) after circulating in gas-gas heat exchanger 153, make it circulate in condenser 157, make H 2 O is condensed and removed. Then, the gas discharged from the condenser 157 flows through the air-gas heat exchanger 153 to perform heat exchange to increase the temperature. Then, the gas is passed through the gas-gas heat exchanger 155 to further exchange heat with the extracted water vapor 131 from the steam turbine. Here, the condenser 157 is an example ...

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Abstract

This carbon dioxide separation / recovery device for separating and recovering carbon dioxide from a gas to be processed, which contains nitrogen oxides and carbon dioxide, with use of a carbon dioxidescavenger is provided with a carbon dioxide trapping unit that comprises a carbon dioxide scavenger. The carbon dioxide trapping unit comprises: a gas inlet for introducing the gas to be processed; aheating unit for heating a scavenger heating gas to a predetermined temperature, said scavenger heating gas being used when carbon dioxide trapped by the carbon dioxide scavenger is separated therefrom; a cooling gas feed port for introducing a scavenger cooling gas that is used when the carbon dioxide scavenger is cooled; and a moisture mixing part for adding moisture to a nitrogen oxide separation gas that is used when nitrogen oxides are separated from the carbon dioxide scavenger. Consequently, NOx accumulated in the carbon dioxide scavenger is separated, thereby suppressing decrease in the performance of the carbon dioxide scavenger and reducing the running cost.

Description

technical field [0001] The invention relates to a carbon dioxide separation and recovery device, a combustion system and a thermal power generation system using the same, and a carbon dioxide separation and recovery method. Background technique [0002] Global warming caused by the emission of greenhouse gases has become a worldwide problem. Greenhouse gas carbon dioxide (CO 2 ), methane (CH 4 ), Freons (CFCs), etc. The most influential of these is the CO 2 , the CO from thermal power plants, ironworks, etc. 2 Construction of a separation and removal system has become an urgent issue. [0003] In addition, CO 2 It can also affect the human body. For example, inhalation containing high concentrations of CO 2 The gas can cause health damage, so in confined spaces such as indoors, it is necessary to manage CO 2 concentration. Especially in environments such as space stations where it is difficult to ventilate outdoor air and indoor air, it is necessary to remove CO 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/04B01D53/50B01D53/56B01D53/62B01D53/82B01J20/06B01J20/34F01K17/04
CPCB01J20/06B01D53/04B01J20/34B01D53/56B01D53/62F01K17/04B01D53/0438B01J20/3466Y02C20/40Y02A50/20Y02P20/151B01D53/82B01D53/60
Inventor 吉川晃平金枝雅人中村英博青岛真裕岛崎俊胜
Owner HITACHI CHEM CO LTD
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