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Lean-burn and rich-burn alternating type catalytic burner and operation method

A catalytic burner and catalytic combustion technology, applied in combustion methods, gas fuel burners, burners, etc., can solve the problems of catalyst carbon deposition, large catalyst consumption, complex components, etc. Combustion stability and wide range of fuel adaptability

Active Publication Date: 2021-05-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the fuel contains more long-chain alkanes (gasoline / diesel / kerosene), the catalyst is prone to carbon deposition, sintering, agglomeration and oxidation, which affects the service life of the catalyst
Zhejiang University proposed an invention patent for a fuel oil combustion device and method based on fuel multi-effect pretreatment and flameless combustion, which can realize the atomization, evaporation and catalytic pretreatment of fuel gas in porous media, but there is high temperature flue gas oxygen Low content, complex composition, easy carbon deposition and deactivation of the catalyst, etc., resulting in defects such as low catalyst life, large catalyst consumption, incomplete combustion, etc.

Method used

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  • Lean-burn and rich-burn alternating type catalytic burner and operation method
  • Lean-burn and rich-burn alternating type catalytic burner and operation method
  • Lean-burn and rich-burn alternating type catalytic burner and operation method

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0027] Equipment structure and composition: refer to figure 1 , the first gas channel 1 and the second gas channel 2 are connected with the four-way valve 3 to realize the switching of lean / rich premixed gas, the four-way valve 3 is respectively connected with two gas inlets 4 through the gas pipeline, and the gas inlet 4 Behind is the catalytic combustion zone 5 . The axial section of the burner is square, and a catalytic combustion zone 5 and a gas phase combustion zone 9 are coaxially arranged in sequence along the gas flow direction inside the burner body. The catalytic combustion zone 5 is divided into upper and lower independent parts by the partition plate 6 in the axial direction. The main geometric dimensions (flow area and volume) of the two parts are the same, and the catalyst parameters (type, loading capacity, air speed ratio parameters) same. A swirl vane 7 is arranged coaxially between the catalytic combustion zone 5 and the gas phase combustion zone 9 . An i...

specific Embodiment 2

[0030] Equipment structure and composition: refer to image 3 , the first gas channel 1 and the second gas channel 2 are connected with the four-way valve 3 to realize the switching of lean / rich premixed gas, the first gas channel and the end of B are connected with two gas inlets 4, behind the gas inlet 4 It is the catalytic combustion zone 5. The burner has a cylindrical hollow structure, and the gas phase combustion zone 9 is arranged in the middle of the burner body. The catalytic combustion zone 5 is divided into a rich-burn catalytic combustion zone and a lean-burn catalytic combustion zone, which are symmetrically arranged on both sides of the gas-phase combustion zone 9 . The main geometric dimensions (flow area and volume) of the rich-burn and lean-burn catalytic combustion zones are the same, and the catalyst parameters (type, loading, and space velocity ratio parameters) are the same. The gas inlet 4 is located at the center of the outer end faces of the catalytic ...

specific Embodiment 3

[0033] refer to figure 1, the first gas channel 1 and the second gas channel 2 are connected with the four-way valve 3 to realize the switching of lean / rich premixed gas, the first gas channel and the end of B are connected with two inner and outer nested gas inlets 4, The catalytic combustion zone 5 is immediately behind the gas inlet 4 . The burner is a cylindrical hollow structure, and a catalytic combustion zone 5 and a gas phase combustion zone 9 are coaxially arranged in sequence along the gas flow direction inside the burner body. The catalytic combustion zone 5 is divided into an inner catalytic combustion zone and an outer ring catalytic combustion zone. The main geometric dimensions (flow area and volume) of the inner and outer ring catalytic combustion zones are the same, and the catalyst parameters (type, loading, space velocity ratio parameters )same. A swirl vane 7 is arranged coaxially between the catalytic combustion zone 5 and the gas phase combustion zone 9...

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Abstract

The invention relates to a catalytic combustion technology, and aims to provide a lean-burn and rich-burn alternating type catalytic burner and an operation method. The burner comprises catalytic combustion areas and a gas-phase combustion area which are communicated with each other, wherein each catalytic combustion area is provided with a gas inlet and a waste gas outlet; the catalytic combustion area is filled with a catalyst, and the gas-phase combustion area is provided with an igniter; the two catalytic combustion areas have the same through-flow area and through-flow volume, and are arranged in a parallel interval, parallel sleeving or symmetrical arrangement mode; and fuel gas inlets of the two catalytic combustion areas are connected to a four-way valve through fuel gas pipelines respectively, and remaining connectors of the four-way valve are connected to fuel gas channels used for conveying lean-burn premixed gas and rich-burn premixed gas respectively. Carbon deposition of the catalyst can be relieved, and the service life of the catalyst is prolonged. The usage amount of the catalyst is reduced, the incoming flow gas temperature of a gas phase section is increased, the downstream ignition difficulty is reduced, and the combustion stability is enhanced. The burner is suitable for the fields of heat supply, power generation, tail gas treatment and the like and is wide in application range.

Description

technical field [0001] The invention relates to catalytic combustion technology, which belongs to an alternate coupling combustion device, in particular to a combustion device and a method for coupling catalytic combustion and gas-phase combustion. Background technique [0002] Catalytic combustion is an important means to improve combustion efficiency, reduce pollutant emissions and stabilize combustion, so it is widely used. When the fuel contains more long-chain alkanes (gasoline / diesel / kerosene), the catalyst is prone to carbon deposition, agglomeration and oxidation, which affects the service life of the catalyst. Zhejiang University proposed an invention patent for a fuel oil combustion device and method based on fuel multi-effect pretreatment and flameless combustion, which can realize the atomization, evaporation and catalytic pretreatment of fuel gas in porous media, but there is high temperature flue gas oxygen Low content, complex composition, easy carbon deposit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23D14/02F23D14/18F23D14/46F23D14/62
CPCF23D14/02F23D14/18F23D14/46F23D14/62F23D2203/007F23D2203/107
Inventor 杨卫娟周俊虎何勇刘建忠王智化周志华程军张彦威岑可法
Owner ZHEJIANG UNIV
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