A device and process for producing methane by utilizing high-concentration CO

A high-concentration methane production technology, which is applied in high-concentration CO methane production equipment and methane production equipment field, can solve the problems of difficult catalyst process, inability to ensure outlet gas, high temperature rise, etc., and achieve controllable High performance, reduced external water supply, and reduced recycling costs

Active Publication Date: 2017-06-30
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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  • A device and process for producing methane by utilizing high-concentration CO
  • A device and process for producing methane by utilizing high-concentration CO
  • A device and process for producing methane by utilizing high-concentration CO

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 are shown in Table 1.

[0026] Table 1 Process parameters of each section 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 changes of process parameters of each stage of logistics are shown in Table 2.

[0031] Table 2 Process parameters of each section 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 are shown in Table 3.

[0036] Table 3 Process parameters of each section 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 producing methane, in particular to a device and method for producing methane by using high-concentration CO contained in chemical tail gas, and belongs to the technical field of chemical industry. The device includes a first-stage methanation device, a second-stage methanation device and a third-stage methanation device, and the imported raw material gas and imported steam pass through the first-stage methanation device, the second-stage methanation device and The product gas is obtained after the third-stage methanation unit; the process uses a three-stage methanation reactor. The present invention adopts direct methanation to carry out conversion hydrogen replenishment and methanation in the same catalyst layer, and recycle CO at the same time 2 Control the methanation degree of the process, effectively control the temperature rise of the system, relatively small catalyst requirements and process difficulty, with the characteristics of small water consumption, small temperature rise, high controllability, and simple separation and collection of by-products.

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 Patents(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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