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Integrated low-pollution combustion chamber nozzle structure and method

A combustion chamber, low-polluting technology, applied in the combustion method, combustion chamber, continuous combustion chamber, etc., can solve the problems of air and fuel mixing performance deviation, flame shape change, deformation displacement and direction inconsistency, etc., to improve fuel uniformity Effect

Inactive Publication Date: 2021-12-10
ZHEJIANG ZHENENG TECHN RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fuel injection part and the air guide part of the nozzle belong to different parts. When thermal expansion occurs, the deformation displacement and direction may be inconsistent, and a large relative displacement will occur, resulting in a large deviation in the mixing performance of air and fuel, which in turn will result in a flame shape. Changes, worsening flame stability and emission performance

Method used

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  • Integrated low-pollution combustion chamber nozzle structure and method
  • Integrated low-pollution combustion chamber nozzle structure and method
  • Integrated low-pollution combustion chamber nozzle structure and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 of the present application provides an integrated low-pollution combustion chamber nozzle structure, including a nozzle body 1, a fuel cavity 2 and an air plate 3, forming an independent nozzle unit, which can work independently or with other The nozzle units work together to form a multi-nozzle structure. Among them, the air plate 3 is welded on the nozzle body 1, and the same material (stainless steel, superalloy, etc.) is used, and the nozzle body 1, the fuel cavity 2 and the air plate 3 can also be integrated and printed by 3D printing technology. This can ensure that the thermal deformations of the nozzle body 1 and the air plate 3 are basically the same, and will not cause relative displacement with changes in inlet conditions, resulting in deterioration of the mixing performance of air and fuel.

[0029] The nozzle body 1 is mainly composed of a nozzle rod wall 11, a nozzle expansion wall 12 and a nozzle end wall 13; the nozzle end wall 13 is provide...

Embodiment 2

[0033] The diversion hole cavity 23 is evenly arranged on the outer side of the nozzle expansion inner cavity 22 . The diversion hole cavity can be a cylindrical cavity or a square cavity. A cylindrical cavity is preferred, and more preferably, the diameter of the cylindrical cavity is 5%-15% of the diameter of the nozzle, and the depth of the cavity is 20%-30% of the diameter of the nozzle. Fuel holes 15 are opened on the outer wall of the diversion hole cavity 23, and the relative positions may form an acute angle of a certain angle, or may be perpendicular to each other. Because the diameter of the diversion hole cavity is larger than the diameter of the fuel hole, the uniformity of fuel between different fuel holes can be improved during fuel distribution; the diversion hole cavity 23 is located outside the nozzle's sudden expansion inner cavity 22, and the depth is greater than diameter, when the fuel flows into the diversion hole cavity, the flow direction is relatively...

Embodiment 3

[0035] figure 2 It is a cross-sectional view of the nozzle structure of an integrated low-pollution combustion chamber. The fuel (methane / hydrogen) enters the inner cavity 21 of the nozzle rod from the fuel inlet, and then enters the inner cavity 22 of the nozzle and is divided into two parts. One part flows along a straight line and hits the nozzle. end wall 13, and form a backflow vortex at the corner of the nozzle end wall 13 and the nozzle guide wall 14, and flow to the nozzle guide hole cavity 23, and finally flow out of the nozzle from the fuel hole 15 at the end of the guide hole cavity 23 structure; the other part flows directly to the nozzle guide hole cavity 23, and finally flows out of the nozzle structure from the fuel hole 15 at the end of the guide hole cavity 23. The diversion hole cavity 23 corresponds to the fuel hole 15 , and the diversion hole cavity 23 may be a cylinder or a square. There is one fuel inlet in one nozzle unit, and the flow uniformity betwe...

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Abstract

The invention relates to an integrated low-pollution combustion chamber nozzle structure which comprises a nozzle body, a fuel cavity and an air plate. The air plate is welded on the nozzle body to form an integrated structure, and the air plate and the nozzle body are made of same materials; a nozzle flow guide wall surface is arranged on the inner wall of a nozzle end part wall surface of the nozzle body; the fuel cavity is mainly formed by connecting a nozzle rod inner cavity and a nozzle sudden expansion inner cavity, and a nozzle flow guide hole cavity is formed in the outer side of the nozzle sudden expansion inner cavity; the air plate is composed of air holes and an air plate wall face, and the air holes are evenly distributed in the air plate wall face; and a fuel hole is formed in the outer side of the nozzle flow guide hole cavity. The integrated low-pollution combustion chamber nozzle structure has the beneficial effects that the integrated nozzle structural form is adopted, the air holes and fuel nozzles are structurally integrated and are machined of the same materials, it can be guaranteed that under different working conditions, the air holes and the fuel nozzles keep consistent expansion deformation, the consistency of main design sizes is kept, and the mixing characteristic of fuel and air is kept consistent with a design result.

Description

technical field [0001] The invention relates to a nozzle structure, in particular to an integrated low-pollution combustion chamber nozzle structure and method. Background technique [0002] With the energy shortage and the world's emphasis on environmental issues, countries have increasingly strict requirements on the pollution emission performance and combustion efficiency of gas turbines. Generally, gas turbines are required to be in the load range of more than 50%, and the combustion chamber emissions can be maintained at a low level. High combustion efficiency. For gaseous fuels (such as methane), in order to achieve low emission levels, premixed combustion technology is widely used. Although premixed combustion can achieve a lower emission level, during the operation of the unit, it is easy to cause the mixed gas velocity to be lower than the flame velocity due to various failures (nozzle clogging, dirt or design defects), and then flash back and cause damage to the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23R3/28
CPCF23R3/286
Inventor 汪玉明孙士恩林俊光林钢秦刚华鲍听马聪俞李斌
Owner ZHEJIANG ZHENENG TECHN RES INST