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A method to replace natural gas with surplus electricity system

A technology to replace natural gas and excess electricity, applied in the field of methanation, to achieve the effect of reducing emissions, reducing environmental pressure, and reducing carbon tax expenditures

Active Publication Date: 2019-03-08
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] At present, there is no technical report similar to this method to replace natural gas with excess electricity such as abandoned solar / wind / hydropower or nuclear power to achieve energy storage peak shaving

Method used

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  • A method to replace natural gas with surplus electricity system

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Embodiment 1

[0050] according to figure 1 The process flow shown performs electrolysis of water for hydrogen production and carbon dioxide methanation.

[0051] After the power from abandoned light, abandoned wind, abandoned water and / or nuclear power is connected to the electrolysis hydrogen production device, the generated hydrogen enters the hydrogen storage tank for storage, with a purity of >99% and a total sulfur of less than 0.1ppm.

[0052] The hydrogen flow rate at the outlet of the hydrogen storage tank is 40,000 kmol / h, and the pressure is 0.1 MPa; the pressure is 3.0 MPa after being pressurized by the hydrogen booster device 3; the pressurized hydrogen is heated to 280°C.

[0053] The above-mentioned hydrogen gas is divided into 3 strands according to the volume ratio of 0.33:0.23:0.44, and the first strand enters the gas mixer 4 to be mixed with carbon dioxide.

[0054] The carbon dioxide pressure is 3.0 MPa, 10000 kmol / h, the purity is >99% and the total sulfur is less than ...

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Abstract

The invention discloses a method for utilizing electricity to gas (ETG). The method comprises the following steps: (1) preparing hydrogen by using water electrolyzed by surplus electricity, and collecting the produced oxygen as a by-product; (2) increasing the pressure of the hydrogen to 0.5-5MPa, and then heating up to 220-350 DEG C; (3) enabling the heated hydrogen to be divided into two parts, inputting one part of hydrogen into a gas mixer, and inputting the other part of hydrogen into a methanation reaction zone; (4) inputting carbon dioxide into the gas mixer to enabled the carbon dioxide to be mixed with the hydrogen; (5) arranging at least four methanation reactors which are connected in series and / or in parallel in the methanation reaction zone, and collecting natural gas at an outlet of the last methanation reactor, wherein the surplus electricity comes from the abandoned light, wind, water and / or nuclear power. According to the method, the reactant is taken as a diluent of the raw material gas, so that the situation that the product gas is needed to be introduced into the raw material gas for diluting the reactant concentration by a recycle compressor in the traditional methanation technology can be avoided; therefore, the compressor is omitted, and the power consumption of mechanical equipment is reduced.

Description

technical field [0001] The invention relates to a method for substituting natural gas (ETG, Electricity To Gas) by using surplus electricity, belonging to the field of methanation. Background technique [0002] As the world's largest power producer, China is facing the problem of relative surplus of power due to the stabilization of economic growth. The main reason for the relative surplus of electricity is the slowdown of economic development and the decline in social demand for electricity, which is caused by the Chinese economy entering the new normal. The relative surplus of electricity has brought about very serious abandonment of wind, light and water. my country has become the country with the largest wind power scale and the fastest growing photovoltaic power generation in the world. However, the phenomenon of new energy curtailment is increasing day by day, and a large amount of clean energy is wasted. [0003] At the same time, the negative impact of "peak-to-va...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/08
CPCC10L3/08
Inventor 姚辉超宋鹏飞侯建国王秀林谢旭光张瑜曹婧高振穆祥宇
Owner CHINA NAT OFFSHORE OIL CORP
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