Decoupling gas burner

A gas burner, gas technology, applied in the direction of gas fuel burners, burners, combustion methods, etc., can solve the problems of shortened burnout time, increased smoke loss, increased CO emissions, etc., to increase reducing combustion range, reduction of NOx generation, and effect of increasing flame diameter

Active Publication Date: 2019-06-14
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many of these gases have low or unstable calorific value, large fluctuations in composition and pressure, and relatively weak combustion stability or low-nitrogen combustion capabilities; some gases contain H 2 Large amount, high-load flame intensity and low-load tempering control problems are prominent; some gases contain fuel nitrogen, and NOx emission control is more complicated
[0004] Diffusion combustion is beneficial to suppress the formation of fuel-type NOx. However, traditional diffusion combustion focuses on the diffusion of gas with a small cross-section to the air with a large air space. Although the two-way diffusion is promoted by air swirl, it is easy to generate local high temperature and high oxygen in the middle of combustion. , it is difficult to control thermal NOx; some premixed flames are easier to control NOx, but there are problems of tempering and defiring, and the stable combustion range is narrow; large industrial burners are not suitable for surface combustion, and high excess air coefficient is used for stable combustion The capacity becomes worse, and the loss of smoke exhaust increases; the gas containing fuel nitrogen is not suitable for traditional thick-lean combustion, and there is no solution to the formation of NOx in the oxygen-enriched area; the use of flue gas recirculation is beneficial to control the formation of NOx, but it will reduce the ability to stabilize combustion , and increased operating power consumption
[0005] Due to the limitation of air and gas diffusion and mixing methods, the staged combustion effect of traditional burners in limited spaces is limited
The use of a large number of burn-off air schemes far away from the main combustion area can realize st

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] figure 1 The sectional view of the decoupling gas burner provided for this embodiment; figure 2 Front view of the decoupled gas burner provided for this example. This embodiment provides a decoupled gas burner, the fuel of which is natural gas or industrial gas, wherein industrial gas includes by-products of metallurgical industry such as coke oven gas, blast furnace gas and converter gas, and some are refinery dry gas (gas gas), production of methanol, synthetic ammonia and other chemical process release gas, analysis gas, etc., some are pyrolysis gasification gas of coal, biomass and garbage, and some are coal bed methane, biogas, raw coal gas, landfill pit gas or Other ultra-low calorific value tail gas and waste gas, etc. When installed and used, one end of the decoupling gas burner extends into the combustion furnace or other furnace body, and the fuel and air are sent into the furnace according to the required concentration, speed, turbulence and mixing method,...

Embodiment 2

[0071] figure 2 A cross-sectional view of the burner provided for this example. Such as figure 2 As shown, the structure of the decoupling gas burner provided in this embodiment is basically the same as the structure of the decoupling gas burner provided in Embodiment 1, except that the outer wall surface of the end of the outer cylinder 1 protruding into the furnace An extension 12 capable of sliding along the axial direction of the outer cylinder 1 is provided. The extension 12 is a cylindrical structure, and the inner diameter of the extension 12 is slightly larger than the outer diameter of the outer cylinder 1. By adjusting the extension 12 relative to the frustum-shaped cylinder The relative position of 6 changes the degree of deflection of the third-stage wind, so that the decoupled gas burner can adapt to different types of gas, saves the operation process of replacing the frustum-shaped cylinder 6 of different structures, and reduces the assembly time. Moreover, i...

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Abstract

The invention discloses a decoupling gas burner, and belongs to the technical field of combustion equipment. The decoupling gas burner comprises an outer cylinder body, a separation cylinder body, a gas outer cylinder body and a gas inner cylinder body which are sequentially arranged from outside to inside and coaxial, a first-stage air duct is formed in the gas inner cylinder body, a gas channelis formed between the gas inner cylinder body and the gas outer cylinder body, a second-stage air duct is formed between the gas outer cylinder body and the separation cylinder body, a third-stage airduct is formed between the separation cylinder body and the outer cylinder body, the decoupling burner further comprises a frustum-shaped cylinder body, the small-diameter end of the frustum-shaped cylinder body is connected to the end, which extends into a hearth, of the separation cylinder body, the outer diameter of the large-diameter end of the frustum-shaped cylinder body is smaller than theinner diameter of the outer cylinder body, and in the axial direction of the frustum-shaped cylinder body, the distance between the end, which extents into the hearth, of the outer cylinder body andthe large-diameter end of the frustum-shaped cylinder body is adjustable. According to the provided decoupling gas burner, the frustum-shaped cylinder body is arranged so that the decoupling gas burner can be suitable for different gas and hearth structures.

Description

technical field [0001] The invention relates to the technical field of gas combustion equipment, in particular to a decoupled gas burner. Background technique [0002] Natural gas has good performance, high calorific value, and does not contain fuel nitrogen. The key point is to control the combustion temperature to avoid the formation of thermal NOx. For small-capacity equipment, the theoretical combustion temperature can be reduced by fully premixed surface combustion with a high excess air ratio, and flashback and defiring can be avoided; rich-lean combustion (deviated combustion) and air / fuel staged combustion need to take into account combustion stability and The theoretical combustion temperature of each stage. The process of oxygen-lean combustion first (poor oxygen in the central ignition zone) has high stability, but the combustion temperature is relatively high; the process of fuel-lean combustion first (lean fuel in the central ignition zone) has a large room for...

Claims

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Application Information

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IPC IPC(8): F23D14/02F23D14/62F23D14/58
Inventor 郝江平赵康高士秋余剑
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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