A two-stage temperature-raising reduction method for a coal-to-natural gas methanation catalyst

A methanation catalyst and coal-to-natural gas technology, applied in the direction of gas fuel, petroleum industry, fuel, etc., can solve the problems of large amount of high-purity nitrogen, long heating and reduction time, and difficult control of reduction, so as to save high-purity nitrogen and shorten the Heating time, effect of improving reduction efficiency

Active Publication Date: 2016-06-08
CNOOC GAS & POWER GRP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temperature rise and reduction time of multiple reactors is long, and the amount of high-purity nitrogen used is large, so the reduction of the latter few reactors is difficult to control

Method used

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  • A two-stage temperature-raising reduction method for a coal-to-natural gas methanation catalyst

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Effect test

Embodiment 1

[0022] This coal-to-natural gas methanation catalyst two-stage temperature-raising reduction system contains six methanation reactors, namely the first methanation reactor, the second methanation reactor, the third methanation reactor, and the fourth methanation reactor , the fifth methanation reactor and the sixth methanation reactor, divide the six methanation reactors into two sections, and establish the first section of nitrogen circulation system for the first three methanation reactors, the system includes the first three methanation reactions device, compressor, heating system, nitrogen interface and feed gas interface, add high-purity nitrogen to the system to circulate, maintain the system pressure at about 0.6MPa, the heating system continuously provides heat for the circulating material, and the temperature rises at a rate of 30-50°C / h At about 450°C, a certain amount of raw material gas is introduced into the circulation system to control the CO+CO in the circulatio...

Embodiment 2

[0024] This coal-to-natural gas methanation catalyst two-stage temperature-raising reduction system contains seven methanation reactors, namely the first methanation reactor, the second methanation reactor, the third methanation reactor, and the fourth methanation reactor , the fifth methanation reactor, the sixth methanation reactor and the seventh methanation reactor, the seven methanation reactors are divided into two sections, and the first section nitrogen circulation system is established for the first three methanation reactors, the system Including the first three methanation reactors, compressors, heating system, nitrogen interface and feed gas interface, add high-purity nitrogen to the system to circulate, maintain the system pressure at about 0.6MPa, and the heating system continuously provides heat for the circulating materials, at 30-50 The heating rate of ℃ / h rises to about 450℃, and a certain amount of raw material gas is introduced into the circulation system to...

Embodiment 3

[0026] This coal-to-natural gas methanation catalyst two-stage temperature-raising reduction system contains six methanation reactors, namely the first methanation reactor, the second methanation reactor, the third methanation reactor, and the fourth methanation reactor , the fifth methanation reactor, and the sixth methanation reactor, the six methanation reactors are divided into two sections, and the first two methanation reactors are set up with a nitrogen circulation system in the first section, which includes the first two methanation reactions device, compressor, heating system, nitrogen interface and feed gas interface, add high-purity nitrogen to the system to circulate, maintain the system pressure at about 0.6MPa, the heating system continuously provides heat for the circulating material, and the temperature rises at a rate of 30-50°C / h At about 450°C, a certain amount of raw material gas is introduced into the circulation system to control the CO+CO in the circulati...

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Abstract

The invention belongs to the field of chemical industry and relates to a temperature-increasing reduction system, in particular to a two-stage temperature-increasing reduction method for a coal-to-natural gas methanation catalyst. In this method, more than six methanation reactors are divided into two sections, and two nitrogen cycles are respectively established, and the temperature is raised in sections, and the reduction is carried out in sections. The reduction uses a part of the raw material gas, that is, the synthesis gas, and uses the reducing gas in the raw material gas. h 2 , CO to reduce the catalyst; after the second stage reduction is completed, the temperature of the first stage methanation reactor that has been cooled is raised, and the difference between the temperature raised in the first stage and the temperature lowered in the second stage is ±50°C At this time, the overall temperature of all methanation reactors is raised until the start-up temperature requirements are met. The method can greatly shorten the heating time and reduction time; save a large amount of high-purity nitrogen; make the reduction process more flexible and easier to control, which is beneficial to more balanced and thorough reduction of methanation catalysts at all levels.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a temperature-increasing reduction system, in particular to a two-stage temperature-increasing reduction method for a coal-to-natural gas methanation catalyst. Background technique [0002] With the rapid development of my country's national economy, the demand for energy will continue to increase, and my country's energy structure characteristics of "rich coal, poor oil and little gas" determine that coal resources will be developed and utilized as the main energy source for a long time . my country's coal-to-natural gas resource conditions are unique and can meet production needs. According to statistics, there are currently nearly 35 coal-to-natural gas projects in the planning, preliminary work or construction stages in China. There are 12 major projects planned during the "Twelfth Five-Year Plan" period. If all these projects are completed, my country will achieve an annual pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/08
Inventor 宋鹏飞杨宽辉姚辉超谭建冬侯建国曾凌云王秀林何洋高振郑珩穆祥宇张新波张瑜
Owner CNOOC GAS & POWER GRP
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