WO2010081271A1

WO2010081271A1 - Rapidly-ignited pulverized coal nozzle

Info

Publication number: WO2010081271A1
Application number: PCT/CN2009/001049
Authority: WO
Original assignee: 上海锅炉厂有限公司
Priority date: 2008-12-30
Filing date: 2009-09-21
Publication date: 2010-07-22
Also published as: CN201344525Y

Abstract

A rapidly-ignited pulverized coal nozzle includes a nozzle outer shell (1), a nozzle inner shell (2) is provided inside the nozzle outer shell (1), connecting angle plates (3) are provided in the corners of the nozzle outer shell (1) and the nozzle inner shell (2), at least one flame stabilization tooth (4) is provided on the upper side and the lower side of the nozzle inner shell (2) respectively, at least one splitter plate (5) is provided in the middle of the nozzle inner shell (2).

Description

A fast ignition coal powder nozzle

The utility model relates to a fast ignition coal powder nozzle, belonging to the technical field of nozzles. Background technique

Conventional boilers use a wide ratio (WR) pulverized coal nozzle or a reinforced ignition (EI) pulverized coal nozzle. Wide adjustment ratio (WR) The pulverized coal nozzle is equipped with a V-shaped bluff body, so that the primary wind forms a stable recirculation zone in front of the V-shaped bluff body, and the high-temperature flue gas is taken up to stabilize the flame; the enhanced ignition (EI) The middle part of the pulverized coal nozzle is equipped with two steady flow plates, which can stabilize the flame at a certain distance from the nozzle outlet and also stabilize the flame. The disadvantage of these two nozzles is that the flame is not stable enough to effectively reduce the generation of N0 _X. Effectively extend the burning time of coke. Summary of the invention

It is an object of the present invention to provide a fast ignition pulverized coal nozzle that overcomes the above disadvantages.

In order to achieve the above object, the technical proposal of the present invention provides a fast ignition pulverized coal nozzle, which is characterized in that it comprises a nozzle housing, and a nozzle inner casing is arranged in the nozzle housing, and a nozzle shell and a nozzle inner casing corner are respectively respectively connected. The gusset plate is provided with at least one stabilizing tooth on the upper and lower sides of the inner casing of the nozzle, and at least one shunt plate is arranged in the middle of the inner shell of the nozzle.

The utility model has the advantages of strengthening the ignition effect, maintaining the flame stability, thereby effectively reducing the formation of the crucible, prolonging the burning time of the coke, and improving the combustion efficiency. DRAWINGS

Figure 1 is a schematic view of a fast ignition pulverized coal nozzle;

Figure 2 is a schematic diagram of another fast ignition pulverized coal nozzle. detailed description

The present invention will be specifically described below in conjunction with the embodiments.

Example 1

As shown in FIG. 1 , which is a schematic diagram of a fast ignition pulverized coal nozzle, the fast ignition pulverized coal nozzle is a rectangular nozzle shell 1 , a rectangular nozzle inner casing 2 and a corner jointing angle plate 3 , a steady combustion tooth 4. The splitter plate 5 is composed. The nozzle housing 1 and the nozzle inner casing 2 are connected by a baffle which is consistent with the direction of the air flow, and both corners are Connected by the connection gusset 3. Four stabilizing teeth 4 are arranged at intervals above and below the inner casing, and the stabilizing teeth 4 are also closely attached to the inner casing plate. A splitter plate 5 is arranged in the center of the inner casing, and both sides are welded to the inner casing.

Example 2

As shown in Fig. 2, it is a schematic diagram of another fast ignition pulverized coal nozzle, which is composed of a rectangular nozzle casing 1, a rectangular nozzle inner casing 2, and a corner jointing angle plate 3, which is ignited. The teeth 4 and the splitter plate 5 are composed. The nozzle housing 1 and the nozzle inner casing 2 are welded and connected by a baffle which is in the same direction as the air flow direction, and both corners are connected by the connecting gusset 3. Five stabilizing teeth 4 are arranged at intervals above and below the inner casing, and the stabilizing teeth 4 are also tightly welded to the inner casing. Two splitter plates 5 are arranged in the center of the inner casing, and the two sides are connected to the inner shell plates.

The rapid ignition pulverized coal nozzles of Embodiments 1 and 2 adopt an innovative principle and structure, and by arranging a tooth-shaped blocking block (stabilizing teeth 4) at the upper and lower ends of the nozzle outlet, soaking high-temperature flue gas and reducing pulverized coal The exit velocity of the airflow, while delaying the mixing of the perimeter wind and the pulverized coal gas flow, achieves the effect of strengthening the fire. At the same time, the flame can be stabilized within a certain distance from the nozzle outlet, so that the volatiles can quickly ignite under the fuel-rich atmosphere, and the flame is kept stable, thereby effectively reducing the generation of N0 _X , prolonging the burning time of coke and improving the combustion efficiency.

Claims

Rights request:

1. A fast ignition pulverized coal nozzle, characterized in that it comprises a nozzle housing (1), a nozzle inner casing (2), a nozzle housing (1) and a nozzle inner casing (2) corner portion in the nozzle housing (1) There are respectively connecting gussets (3), at least one stabilizing tooth (4) is arranged on the upper and lower sides of the nozzle inner casing (2), and at least one shunt plate (5) is arranged in the middle of the nozzle inner casing (2).