Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and apparatus for utilizing plant waste gas to prepare natural gas

A natural gas and exhaust gas technology, applied in the field of chemical engineering, can solve the problems affecting the conversion rate of synthetic methane and the decrease of methane equilibrium constant, and achieve the effects of increasing methane synthesis rate, reducing power consumption and protecting the environment

Inactive Publication Date: 2014-07-09
杭州林达化工技术工程有限公司
View PDF9 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the above-mentioned adiabatic reactor, as the reaction heat is released, the temperature of the reaction gas increases, and the equilibrium constant of methane is greatly reduced, which affects the CO 2 Synthetic methane conversion rate

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and apparatus for utilizing plant waste gas to prepare natural gas
  • Method and apparatus for utilizing plant waste gas to prepare natural gas
  • Method and apparatus for utilizing plant waste gas to prepare natural gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] use as image 3 The process flow shown is from the factory waste gas 1 (the synthetic ammonia plant contains H 2 , N 2 relaxation gas) to purify and remove ammonia, together with purified factory waste gas 2 (including CO 2 Decarburization and desorption gas), the total gas volume is 1000Kmol / h, under the pressure of 2MPa, in a vertical tube-wound water-cooled reactor equipped with a nickel-based TiO carrier methanation catalyst, at a space velocity of 3000h -1 CO 2 Hydromethanation reaction, after cooling to remove water, CH 4 About 50%, N 2 40% of the product gas is 4959Kmol / h, separated by pressure swing adsorption to obtain CH 4 88% of the product gas is compressed to 25MPa to obtain 2580Kmol / h compressed natural gas for vehicles.

Embodiment 2

[0034] Such as Figure 4 The shown device of the present invention comprises steam drum 101, water pump 102, methanation synthesis reactor 103, tower front heat exchanger 104, start-up heater 105, water cooler 106, water separator 107, methane concentration device 108, compression machine 1010 and steam turbine 109, the methanation synthesis reactor 103, tower front heat exchanger 104, water cooler 106, water separator 107, methane enrichment device 108, compressor 1010 and steam turbine 109 Connected in sequence, the methanation reactor 103 is also externally connected with a steam drum 101 , a water pump 102 and a start-up heater 105 , and the steam drum 101 is also connected with a steam turbine 109 .

[0035]The start-up heater 105 can be a steam injector, or an electric heater installed on the inlet pipeline between the pre-column heat exchanger 104 and the methanation synthesis reactor 103 .

[0036] The purified industrial waste gas advances to the pre-tower heat excha...

Embodiment 3

[0038] Figure 5 A water-cooled coiled-tube reactor is used as the methanation synthesis reactor ( Figure 5 Other equipment in the device are not shown, and the composition and connection of the rest of the equipment are the same as the schematic diagram of embodiment 2). This water-cooled coiled tube reactor is an invention patent (application number 201210033806.1, application date February 14, 2012) that the applicant has applied for ) in a reactor, including a shell 1 and a heat exchange element, the top of the shell 1 is provided with an air inlet 3 and a manhole 4, the air inlet 3 is equipped with a gas distribution plate 81, and the lower part of the shell is provided with a For headers with tube sheets: inlet header 9a and outlet header 9b. The inner and outer rings or the tops of two adjacent heat exchange tubes 2 with the same ring diameter are connected by an inverted U-shaped elbow to form an arrangement of an uplink heat exchange tube and a downlink heat exchang...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for utilizing plant waste gas to prepare natural gas, and one or more plant waste gases are purified for removing substances harmful to catalysts and a reaction is performed for generating methane and further for preparing an artificial natural gas product. The invention also discloses an apparatus applied to the method. According to the technical scheme, coal gas is not needed for synthesizing methane, but industrial waste gas is utilized, so that national resource is saved, CO2 discharge is reduced and environment is protected; by utilizing the technology of water-cooling heat-exchanging low-temperature methanation, the methanation reaction conditions are optimized, the methane synthetic rate is improved, the flow is simplified, equipment is reduced, a circulator is cancelled, and power consumption is reduced; and a by-product high-pressure steam of the methane synthetic reaction is utilized as the drive power of a steam turbine and a water pump needed by compressing natural gas, and therefore energy is saved and consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a method and a device for producing synthetic natural gas by using factory waste gas. Background technique [0002] Natural gas is a kind of clean energy. The proportion of natural gas in civil energy in my country is far lower than the international average. The 12th Five-Year Natural Gas Development Plan of the National Development and Reform Commission clearly requires an annual increase of 50 billion cubic meters of natural gas. Coal-based natural gas can be directly added to coal Hydrogen gasification or steam catalytic conversion one-step methanation, but currently widely used coal gasification to produce syngas and then convert the H 2 , CO, CO 2 Carry out methanation reaction to produce synthetic natural gas. Whether it is one-step methanation or coal gasification and re-methanation, a large amount of coal resources will be consumed. However, there are many k...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08
Inventor 楼韧楼寿林
Owner 杭州林达化工技术工程有限公司