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

Device and method for catalytic deoxidation of landfill gas

A technology of landfill gas and catalytic deoxidation, which is applied in chemical instruments and methods, separation methods, gas fuels, etc., can solve the problems of complex design, large investment, and many catalysts, so as to reduce the number of stages or layers and reduce the processing efficiency. High and low energy consumption

Active Publication Date: 2017-11-21
CHENGDU ZHONGKE ENERGY & ENVIRONMENTAL PROTECTION CO LTD
View PDF13 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the above method requires the use of multi-stage or multi-layer reactors, which requires a large investment, and has high requirements for the ratio of each stage or layers in the multi-stage or multi-layer reactor, and the design is relatively complicated; in addition, the above method needs to deoxidize The final gas is mixed with the raw material gas and enters the deoxidation reactor again, resulting in low processing efficiency of the reactor and requiring more catalysts; moreover, in this method, the deoxidized gas needs to be circulated, and the energy consumption and investment of the circulation compressor are relatively large.

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
  • Device and method for catalytic deoxidation of landfill gas
  • Device and method for catalytic deoxidation of landfill gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Collect landfill gas from a waste landfill site, and the flow rate of landfill gas after pretreatment such as dust removal and desulfurization is 6000m 3 / h, the oxygen content in the landfill gas is 1.5%, the temperature of the landfill gas is 40°C, and the design maximum temperature of the catalytic deoxidation reactor is 550°C; the heater is used to heat the landfill gas to 270°C at the initial stage of start-up and pass through the catalytic deoxidation Reactor, in the catalytic deoxygenation reactor, the methane in the raw gas and the oxygen in the raw gas are catalyzed by the deoxidation catalyst to generate water and carbon dioxide from methane and oxygen to achieve deoxygenation. Due to catalytic combustion, the temperature of deoxygenation rises When the temperature reaches 400°C, turn off the heater and enter the normal operation stage;

[0039] During normal operation, the temperature of the raw material gas is raised through heat exchange with the deoxygenat...

Embodiment 2

[0041] During the normal operation of Example 1, the gas volume and temperature of the landfill gas remained unchanged, but the oxygen content increased to 2.0%, and the temperature of the catalytic deoxygenation reactor and the deoxygenation reactor increased sharply to 480 due to the increase of the oxygen content. ℃, the deoxygenation (high temperature) after deoxidation and the raw material gas (normal temperature) are exchanged through the gas-gas heat exchanger, the deoxygenation temperature drops to 160 ℃, the raw material gas temperature rises to 400 ℃, and the raw material gas at 400 ℃ is passed into the deoxidation The reactor performs catalytic deoxygenation, and the maximum design temperature of the catalytic deoxygenation reactor is 550 ° C, which is only 70 ° C. Since catalytic combustion is an adiabatic temperature rise process, if no measures are taken, the temperature of the catalytic deoxygenation reactor and the raw material gas entering the catalytic deoxygen...

Embodiment 3

[0043] During the normal operation of Example 2, the gas volume and temperature of the landfill gas remained unchanged, but due to a break in a certain position of the extraction pipeline, air was introduced during the extraction process, resulting in an increase of the oxygen content in the landfill gas to 4%. , due to the increase in oxygen content, the temperature of the catalytic deoxygenation reactor and deoxygenation rises sharply to 600°C. When the temperature drops to 250°C, the temperature of the feed gas rises to 450°C, and the feed gas at 450°C is passed into the deoxidation reactor for catalytic deoxidation. 550°C and 400°C. In order to ensure safe production and avoid accidents caused by excessively high temperature of the catalytic deoxygenation reactor, stop the feed gas from entering the catalytic deoxygenation reactor at this time, and pass nitrogen directly into the catalytic deoxygenation reactor through the nitrogen cooling branch 12. The raw material gas ...

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 provides a landfill gas catalytic deoxidation device and method. The landfill gas catalytic deoxidation device comprises a main raw material gas pipeline, a gas-gas heat exchanger, a heater, a catalytic deoxidation reactor, an air cooler and a gas-liquid separator. The main raw material gas pipeline, the gas-gas heat exchanger, the heater and the catalytic deoxidation reactor are sequentially connected in series. The heater is used for heating first raw material gas from the main raw material gas pipeline to ignition temperate at the system start-up stage and providing the first raw material gas for the catalytic deoxidation reactor for deoxidation. After the temperature of the catalytic deoxidation reactor is raised to 270 DEG C, the heater is turned off. The gas-gas heat exchanger is used for utilizing deoxidized gas from the catalytic deoxidation reactor for heating the first raw material gas to obtain second raw material gas at the normal work stage. The deoxidized gas of the catalytic deoxidation reactor passes through the gas-gas heat exchanger and then is sequentially treated through the air cooler and the gas-liquid separator, and final deoxidized gas is prepared. Only one stage or one layer of catalytic deoxidation reactor is needed, no circulator is needed, treatment efficiency is high, and energy consumption is reduced.

Description

technical field [0001] The invention relates to the field of landfill gas development, in particular to a landfill gas catalytic deoxidation device and method. Background technique [0002] The development and utilization of landfill gas has attracted increasing attention both at home and abroad. Landfill gas usually contains a small amount of oxygen, and the presence of oxygen will cause greater safety hazards during the transportation, separation and utilization of combustible gases. In order to safely utilize the above unconventional natural gas, deoxygenation is a necessary link. At present, the deoxygenation methods mainly include catalytic combustion deoxygenation, non-catalytic combustion deoxygenation and photocatalytic combustion deoxygenation. [0003] At present, non-catalytic combustion deoxygenation (public patent CN 102719290B) and photocatalytic combustion deoxygenation (public patent CN102627988B) are still in the research stage. There are many researches ...

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 Patents(China)
IPC IPC(8): C10L3/10B01D53/86B01D53/46
CPCY02E50/30
Inventor 周一民罗仕忠李东黄显波龚琼
Owner CHENGDU ZHONGKE ENERGY & ENVIRONMENTAL PROTECTION CO LTD