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A method for converting natural gas into synthetic gas

A natural gas and conversion gas technology, applied in the field of natural gas conversion to produce synthetic gas, can solve the problems of high consumption of natural gas, large investment in equipment, difficult industrial application, etc., and achieve the effect of large-scale conversion, low energy consumption and increased content

Active Publication Date: 2017-12-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high ratio of carbon to hydrogen, it is difficult to meet the requirements of synthesizing methanol, liquid fuel and dimethyl ether products, and the energy consumption, equipment investment and natural gas consumption are also large, so it is difficult to realize large-scale industrial application

Method used

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  • A method for converting natural gas into synthetic gas
  • A method for converting natural gas into synthetic gas
  • A method for converting natural gas into synthetic gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] as attached figure 1 As shown, the natural gas from the boundary area enters the hydroconverter 1 and the zinc oxide desulfurization tank 2 in order to remove hydrogen sulfide and organic sulfide in the natural gas. The desulfurized natural gas is mixed with the first water vapor to form the first mixed gas at 530° C. and 3.8 MPa, and the volume ratio of the first water vapor to natural gas is 3.5:1. The first mixed gas is heated to about 505°C through the mixed feed gas coil in the convection section of the primary reformer 3, and then enters the furnace tubes of the primary reformer 3 (the furnace tubes are divided into nine rows, 42 tubes in each row). The steam reforming of hydrocarbons is carried out under the action of a catalyst to generate a reformed gas. The steam reforming reaction of hydrocarbons is an endothermic reaction, and the heat required for the first-stage reforming reaction is supplied by the burner at the top of the radiant section of the first-st...

Embodiment 2

[0049] The natural gas from the boundary area enters the hydroconverter 1 and the zinc oxide desulfurization tank 2 in order to remove hydrogen sulfide and organic sulfide in the natural gas. The desulfurized natural gas is mixed with the first water vapor to form the first mixed gas with a temperature of 550°C and a pressure of 4.0 MPa, wherein the volume ratio of the first water vapor to natural gas is 2:1.

[0050] After the carbon dioxide from the outlet of the carbon dioxide compressor exchanges heat with the medium-pressure steam in the heat exchanger 13, it is mixed with the second water vapor and pure oxygen (25°C, 4.6MPa) from the large air separation in the mixer 14 to form The second mixed gas, so that the volume ratio of the second water vapor, carbon dioxide and oxygen in the second mixed gas is 1:0.7:1.4.

[0051] The second mixed gas and the first mixed gas are simultaneously sent to the preheating section of the primary reformer 3 for reaction to generate a pri...

Embodiment 3

[0055] The natural gas from the boundary area enters the hydroconverter 1 and the zinc oxide desulfurization tank 2 in order to remove hydrogen sulfide and organic sulfide in the natural gas. The desulfurized natural gas is blended into the first mixed gas with the formation temperature of the first water vapor at 510°C and a pressure of 3.5 MPa, wherein the volume ratio of the first water vapor to natural gas is 2:1.

[0056] After the carbon dioxide from the outlet of the carbon dioxide compressor exchanges heat with the medium-pressure steam in the heat exchanger 13, it mixes with the second water vapor in the mixer 15 to form a third mixed gas. The temperature of the second steam is 273° C. and the pressure is 3.5 MPa. The carbon-hydrogen ratio is adjusted so that the molar ratio of carbon dioxide to the second water vapor in the third mixed gas is 1:3. The third mixed gas with a qualified carbon-hydrogen ratio passes through the filter 16 to filter out impurities and is ...

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Abstract

The invention discloses a method for producing synthesis gas by converting natural gas. The method comprises the following steps: 1) mixing natural gas with first water vapor to form a first mixed gas; 2) sending the first mixed gas into a reformer for reaction 3) The first-stage reformed gas is mixed with natural gas and then reacted in the second-stage reformer to generate the second-stage reformed gas; 4) The heat of the second-stage reformed gas is recovered by the recovery device for steam regeneration. The synthesis gas produced by the method of the invention reduces the content of nitrogen and increases the content of carbon monoxide in the synthesis gas. Due to its qualified hydrogen-to-carbon ratio, it is especially suitable as a raw material gas for the production of ethylene glycol.

Description

technical field [0001] The invention relates to a method for producing synthesis gas, in particular to a method for converting natural gas to produce synthesis gas. Background technique [0002] Natural gas is a combustible gas formed by buried ancient organisms after hundreds of millions of years of high temperature and high pressure. It is a colorless, odorless, non-toxic, high calorific value, stable combustion, clean and environmentally friendly high-quality energy. The main component of natural gas is methane, and its calorific value is 8500 kcal / m. It is a gaseous fossil fuel mainly composed of methane. It mainly exists in oil fields and natural gas fields, and a small amount comes out of coal seams. Natural gas is also known as green energy. Its sulfur dioxide and dust emissions are close to zero, and its carbon dioxide emissions are also very low, with almost no pollution. In addition, natural gas is clean, easy to use, and widely used, so the development and utili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/34
CPCY02P20/129
Inventor 张绍延骆瑞平张红才李桂萍刘飞
Owner CHINA PETROLEUM & CHEM CORP
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