Self-stabilizing three-stage air-distribution low-NOx pulverized coal burner

A technology of pulverized coal burner and capacity, which is applied to burners, burners, combustion methods and other directions of burning pulverized fuel to achieve uniform combustion temperature distribution, reduce NOx emissions, and improve combustion conditions.

Inactive Publication Date: 2010-02-10
CHINA JILIANG UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the pulverized coal burners put into production are used in power

Method used

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  • Self-stabilizing three-stage air-distribution low-NOx pulverized coal burner
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  • Self-stabilizing three-stage air-distribution low-NOx pulverized coal burner

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the drawings and embodiments.

[0023] Such as Figure 1 ~ Figure 5 As shown, the secondary air box of the present invention is divided into an inner secondary air box 9 with a secondary air inlet 11 and an outer secondary air box 10 by a partition 8 with a circular hole in the center. The outer secondary air box 10 is provided with a cylinder The pre-combustion chamber 7 and the inner secondary air pipe 4 expand to form a conical tube. The pre-combustion chamber 7 is coaxially hollowed in the outer secondary air box 10, and one end of the pre-combustion chamber 7 is connected to the outer secondary air box 10 A ring-shaped tertiary air duct 6 is opened on the closed-end wall surface, and the large end of the cone is sleeved into the orifice at the other end of the pre-combustion chamber 7 to form an annular outer secondary air duct 5; inside the inner secondary air box 9 , The central air pipe 2 is...

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Abstract

The invention discloses a self-stabilizing three-stage air-distribution low-NOx pulverized coal burner. A pre-burning chamber and a conical barrel formed by the cone expansion and extension of an internal secondary air duct are arranged in an external secondary bellows. A large end of the conical barrel is sheathed in an external secondary air passage formed by an opening at one end of the pre-burning chamber. A wall surface at the other end of the pre-burning chamber, which is closed with an external end face of the external secondary bellows, is provided with an annular tertiary air passage.A central air duct is coaxially arranged in a primary air duct. The primary air duct and a cone expanding end of the central air duct are both arranged in the conical barrel. The internal secondary air duct sheaths the outside of the primary air duct. An axial movable cyclone impeller is arranged in the internal secondary air duct. The outer end of the axial movable cyclone impeller is provided with an internal secondary air impeller pull rod. An annular passage of a separating plate is provided with an air regulator. The outer end of the air regulator is provided with an air regulating pullrod. The circumference at the inner end of the air regulating pull rod is equally divided to arrange sliding fins cooperating with an internal secondary bellows in a sliding manner. The burner has strong self-stabilization capability, can adjust a flame position, prevent slag formation in the pre-burning chamber and realize low NOx emission, and is capable of wide application in various industrialpulverized coal boilers.

Description

Technical field [0001] The invention relates to a pulverized coal burner, in particular to a three-stage air distribution low-NOx pulverized coal burner with self-stabilization capability. Background technique [0002] Chain-grate boilers are the majority of coal-fired industrial boilers in my country, and their actual operating efficiency is only about 65%, and their energy efficiency is low. The pulverized coal industrial boiler that adopts the suspension combustion method has higher boiler efficiency. The design of the burner is the key to the combustion of pulverized coal in industrial boilers. Due to the small furnace space of industrial boilers, it is required that the burner should be able to better organize the flow field in the furnace, so that the pulverized coal can be burned efficiently and stably, which can not only avoid the generation of slagging in the furnace, but also have low NO X Emission function. Most of the pulverized coal burners put into production are ...

Claims

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Application Information

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IPC IPC(8): F23D1/02
Inventor 池作和丁守宝成德芳王红峻邓龙强孙公钢刘富君关键王进卿曾宪阳朱霖
Owner CHINA JILIANG UNIV
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