Methanation technology

A methanation and methanation reactor technology, applied in the petroleum industry, gas fuel, fuel and other directions, can solve the problems of unsuitable large-scale supply of natural gas, narrow application range, small production capacity, etc., to improve heat capacity, improve utilization rate, the effect of increasing the concentration

Active Publication Date: 2014-06-18
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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Problems solved by technology

There are also some devices in China that use coke oven gas methanation to produce substitute natural gas, but this method has

Method used

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  • Methanation technology

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Embodiment 1

[0035] according to figure 1 The process flow shown, the pressure is 3.5MPa, the space velocity is 15000h -1After fine desulfurization of the synthetic gas, the total sulfur in the synthetic gas is less than 0.08ppm. After the water vapor shift, the fresh gas is divided into two streams (fresh gas A, B), and the composition (vol%) is: H 2 69.5, CH 4 8.21, CO 17.84, CO 2 1.95, H 2 O 2.5. 60% of the fresh air A passes through a heat exchanger to exchange heat with a reverse product gas to 290°C, heats it to 400°C through an electric heater, and then mixes with the circulating gas to form a reverse intake gas. The circulation ratio is 1.5, The gas inlet temperature is 300°C. After the reaction, the temperature rises to 630°C. After heat exchange, the gas from the first stage is mixed with fresh gas B at 460°C to form the second stage. The gas enters the second methanation reactor. The inlet temperature is 290°C. After the reaction The temperature was 610°C. The outlet gas...

Embodiment 2

[0037] according to figure 1 As shown in the process flow, the pressure is 3.5MPa and the space velocity is 25000h -1 After fine desulfurization of the synthetic gas, the total sulfur in the synthetic gas is less than 0.08ppm. After the water vapor shift, the fresh gas is divided into two streams (fresh gas A, B), and the composition (vol%) is: H 2 69.5, CH 4 8.21, CO 17.84, CO 2 1.95, H 2 O 2.5. 50% of the fresh air A passes through the heat exchanger to exchange heat with a reverse product gas to 280°C, heats it to 400°C through an electric heater, and then mixes with the circulating gas to form a reverse intake gas. The circulation ratio is 1.0, The gas inlet temperature is 290°C. After the reaction, the temperature rises to 670°C. After heat exchange, the gas from the first stage is mixed with fresh gas B at 450°C to form the second stage. The gas enters the second methanation reactor. The inlet temperature is 260°C. After the reaction The temperature is 680°C. The...

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Abstract

The invention discloses a methanation technology for preparing substitute natural gas by using coal based syngas, and belongs to the technical field of new energy utilization. The coal based synthetic gas undergoes fine desulfurization, the obtained fresh gas is divided into two parts comprising a fresh gas A and a fresh gas B, the fresh gas A is mixed with recycle gas, the obtained gas mixture enters a first methanation reactor, the total concentration of CO and CO2 is not greater than 11%, the obtained first reaction product gas is mixed with the fresh gas B, the obtained mixed gas enters a second methanation reactor, the total concentration of CO and CO2 is not greater than 12%, parts of the above obtained second reaction product gas is recycled by a recycle compressor and returns to the inlet of the first methanation reactor, the rest of the second reaction product gas sequentially enters a third methanation reactor and a fourth methanation reactor for a methanation reaction, and the obtained fourth reaction product gas is condensed and separated to obtain the substitute natural gas with the methane content of 95% or less.

Description

technical field [0001] The invention belongs to the technical field of new energy utilization. It relates to a methanation process, in particular to a methanation process for preparing substitute natural gas from coal-based synthesis gas. Background technique [0002] Natural gas is a clean energy with safe use and high calorific value. Its main component is methane. Compared with coal of the same quality, the CO emitted by combustion is only 40% of coal, and there is no waste water and waste residue. [0003] In recent years, with the successive completion and commissioning of national-level gas transmission projects such as "Shaanxi Gas Entering Beijing" and "West-to-East Gas Transmission", the demand for natural gas has shown explosive growth. It is predicted that in 2015, China's natural gas demand will reach 170-210 billion Nm 3 , while the natural gas production in the same period can only reach 140 billion Nm 3 , the gap between supply and demand is about 30-70 bil...

Claims

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Application Information

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IPC IPC(8): C10L3/08
Inventor 朱艳芳魏士新蔡进吴琳孟建张杰陈长新蔡成伟吴学其檀结东
Owner CHINA PETROLEUM & CHEM CORP
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