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Device and process for using high concentration CO for preparing methane

A technology for producing methane and high concentration is applied in the field of devices for producing methane and devices for producing methane with high concentration of CO, which can solve the problems of difficult catalyst process flow, inability to ensure outlet gas, and temperature rise, etc., and achieve controllable High performance, reduced external water supply, and reduced recovery costs

Active Publication Date: 2015-09-16
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing methanation processes such as coal gas methanation use recycled outlet gas, which also contains a large amount of hydrogen. The catalyst requirements and process flow are difficult, and the water consumption is large and the temperature rises high, so the methanation of the outlet gas cannot be guaranteed. complete

Method used

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  • Device and process for using high concentration CO for preparing methane
  • Device and process for using high concentration CO for preparing methane
  • Device and process for using high concentration CO for preparing methane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] according to figure 1 The process conditions, the split ratio of imported raw material gas is 1:1, the ratio of circulating gas volume is 0.6, the volume of imported gas and water vapor is 0.8:1, and the changes of process parameters of each stage of logistics as table 1 shown.

[0026] Table 1 Process parameters of each stage of logistics

[0027]

[0028] In Example 1, it can be seen from simulation calculations that when the inlet feed gas split ratio is 1:1, the recycle gas volume is 0.6, and the inlet gas volume and water vapor volume are 0.8:1, the outlet temperature of the three-stage reactor does not exceed 500°C, and the product The methane content in the gas is >26%, which meets the process design requirements.

Embodiment 2

[0030] according to figure 1 The process conditions, the split ratio of imported raw material gas is 0.6:1, the ratio of circulating gas volume is 0.5, the volume of imported gas and water vapor is 0.8:1, and the variation of process parameters of each stage of logistics as table 2 shown.

[0031] Table 2 Process parameters of each stage of logistics

[0032]

[0033] In Example 2, it can be seen through simulation calculation that when the split ratio of imported raw material gas is 0.6:1, the volume of circulating gas is 0.5, and the volume of imported gas and water vapor is 0.8:1, the outlet temperature of the three-stage reactor does not exceed 500 °C, and the product The methane content in the gas is >26%, which meets the process design requirements.

Embodiment 3

[0035] according to figure 1 The process conditions, the split ratio of imported raw material gas is 1:1, the ratio of circulating gas volume is 0.7, the volume of imported gas and water vapor is 0.8:1, and the changes of process parameters of each stage of logistics as table 3 shown.

[0036] table 3 Process parameters of each stage of logistics

[0037]

[0038] In Example 3, it can be seen through simulation calculation that when the split ratio of the imported raw material gas is 1:1, the circulating gas volume is 0.7, and the volume of the imported gas and water vapor is 0.8:1, the outlet temperature of the three-stage reactor does not exceed 500°C, and the product The methane content in the gas is >26%, which meets the process design requirements.

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Abstract

The invention relates to a device and method for preparing methane, particularly relates to a device and method for using high concentration CO contained in chemical tail gas for preparing methane, and belongs to the chemical technical field. The device includes a first section methanation reaction device, a second section methanation reaction device and a third section methanation reaction device, inlet feed gas and inlet water vapor pass through the first section methanation reaction device, the second section methanation reaction device and the third section methanation reaction device in turn to obtain a product gas, and the process uses a three section methanation reactor. The transformation hydrogen filling and methanation can be performed in the same section catalyst layer by direct methanation, at the same time, CO2 is cycled for methanation degree control of the process, system temperature rising is effectively controlled, the catalyst requirement and process difficulty are relatively small, and the device has the advantages of small water consumption, small temperature rise, high controllability, simple and easy separation and collection of by-products, and the like.

Description

technical field [0001] The invention relates to a device and a process for preparing methane, in particular to a device and a process for preparing methane by utilizing high-concentration CO contained in chemical tail gas, and belongs to the technical field of chemical industry. Background technique [0002] With the continuous development of the national economy, people pay more and more attention to environmental protection. In the past, many industrial exhaust gases were directly discharged or burned into the atmosphere without treatment. With the continuous improvement of carbon emission policies, these industrial exhaust gases need to be reused or purified to meet emission requirements. At present, these gases are used in various ways, but the utilization effect of high-concentration CO gas has been unsatisfactory due to the lack of hydrogen sources, and the current emission of this high-concentration CO gas is still large. [0003] Taking the yellow phosphorus industr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C9/04C07C1/04
Inventor 赵丹李玉富李启强颜智蒙高碧
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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