CN-115823613-B - Tail flag type screen structure of corner tube boiler

CN115823613BCN 115823613 BCN115823613 BCN 115823613BCN-115823613-B

Abstract

A tail flag type screen structure of an angle tube boiler relates to the technical field of boilers. The device aims to solve the problems that when the conventional angle tube boiler is used, the inertia force of smoke can cause abrasion of the welding position of the convection flag type screen and the flagpole tube and the heat exchange efficiency of the convection flag type screen is reduced. The smoke folding flag type screen is arranged at the inlet of the hearth outlet and the inlet of the tail shaft, the convection flag type screen is arranged at the lower parts of the flagpole pipe groups in the hearth outlet and the tail shaft and communicated with the flagpole pipe groups, the smoke folding flag type screen is arranged at the bent angle of the flagpole pipe groups and communicated with the flagpole pipe groups, the smoke folding flag type screen is provided with the smoke folding angle at the side face of the smoke folding flag type screen, the smoke flow can be effectively divided, the abrasion condition of smoke to the root of the convection flag type screen due to the action of inertia force is reduced, the smoke can uniformly pass through the whole convection flag type screen, heat exchange is enhanced, the heat exchange efficiency of the convection flag type screen is improved, and the integral efficiency of a boiler is further improved. The invention is suitable for the technical field of boilers.

Inventors

JIA WENPENG
AN XIN
ZHANG HUABIN
SUN CHAO
WANG ENHAO
ZHAO YAN
TIAN LIHUI
JIANG YINGBO
LI XIN

Assignees

哈尔滨红光锅炉总厂有限责任公司

Dates

Publication Date: 20260508
Application Date: 20221216

Claims (5)

1. A tail flag type screen structure of a corner tube boiler is characterized by comprising a flag tube set (1), a smoke folding flag type screen (2), a throttle plate (3) and a convection flag type screen (4), wherein the smoke folding flag type screen (2) is arranged at a hearth outlet and a tail shaft inlet, the convection flag type screen (4) is arranged at the lower part of the flag tube set (1), the convection flag type screen (4) is communicated with the flag tube set (1), the smoke folding flag type screen (2) is arranged at a bent corner of the flag tube set (1), the smoke folding flag type screen (2) is communicated with the flag tube set (1), the flag tube set (1) comprises a plurality of flag tubes (1-1), the plurality of flag tubes (1-1) are arranged in parallel, the smoke folding flag type screen (2) comprises a plurality of coiled tubes (2-1) and a sealing steel plate (2-2), the middle parts of the two coiled tubes (2-1) are fixedly connected with each other through the sealing steel plate (2-2) to form a flat smoke folding area (1) which is not communicated with the top end of the flag tube set (1), the bottom end of each coiled pipe (2-1) is communicated with the bottom end of the flagpole pipe (1-1), a throttle plate (3) is arranged above the joint of the bottom end of each coiled pipe (2-1) and the bottom end of the flagpole pipe (1-1), and the throttle plate (3) is arranged inside the flagpole pipe (1-1).
2. The tail flag-type screen structure of an angle tube boiler as set forth in claim 1, wherein said flagpole tube The outer surface of the top end of (1-1) is provided with a counter bore (1-2).
3. A tail flag type screen structure of a corner tube boiler as set forth in claim 2, wherein a counter bore (1-2) is formed on the outer surface of the bottom end of the flagpole tube (1-1), and the counter bore (1-2) is located at the edge of the throttle plate (3) and the flagpole tube (1-1) And the lower part of the contact part of the inner wall.
4. The tail flag-type screen structure of an angle tube boiler as set forth in claim 1, wherein said serpentine tube The number of the flagpole tubes (1-1) is equal to the number of the flagpole tubes (2-1).
5. A tail flag-type screen structure of an angle tube boiler as set forth in claim 1, wherein each two of said flag-type screen structures are The middle part of the coiled pipe (2-1) is welded and fixed by a sealing steel plate (2-2).

Description

Tail flag type screen structure of corner tube boiler Technical Field The invention relates to the technical field of boilers, in particular to a tail flag type screen structure of an angle tube boiler. Background At present, due to the relation of hearth arrangement and flue gas flow, flue gas needs to turn 180 degrees when passing through the hearth outlet to the tail shaft position, so that the flue gas passes through the convection flag type screen under the action of inertia force, the abrasion condition of the root of the convection flag type screen is aggravated; In summary, when the conventional angle tube boiler is used, the inertia force of the flue gas can cause abrasion phenomenon at the welding position of the convection flag type screen and the flagpole tube, and the problem of reduced heat exchange efficiency of the convection flag type screen is caused. Disclosure of Invention The invention provides a tail flag-type screen structure of an angle pipe boiler, which aims to solve the problems that when the conventional angle pipe boiler is used, the welding position of a convection flag-type screen and a flagpole pipe is worn by the inertia force of smoke and the heat exchange efficiency of the convection flag-type screen is reduced. The invention relates to a tail flag type screen structure of an angle pipe boiler, which comprises a flagpole pipe group 1, a smoke folding flag type screen 2, a throttle plate 3 and a convection flag type screen 4; the lower part of the flagpole tube group 1 is provided with a convection flag type screen 4, the convection flag type screen 4 is communicated with the flagpole tube group 1, and the bent angle of the flagpole tube group 1 is provided with a smoke folding flag type screen 2, and the smoke folding flag type screen 2 is communicated with the flagpole tube group 1; The smoke folding flag type screen 2 comprises a plurality of coiled pipes 2-1 and sealing steel plates 2-2, wherein the coiled pipes 2-1 are arranged in parallel, and the middle parts of every two coiled pipes 2-1 are fixedly connected through the sealing steel plates 2-2; The top end of each coiled pipe 2-1 in the smoke folding flag type screen 2 is communicated with the top end of a flagpole pipe 1-1 in the flagpole pipe group 1, the bottom end of each coiled pipe 2-1 is communicated with the bottom end of the flagpole pipe 1-1, a throttle plate 3 is arranged above the joint of the bottom end of the coiled pipe 2-1 and the bottom end of the flagpole pipe 1-1, and the throttle plate 3 is arranged in the flagpole pipe 1-1; further, a counter bore 1-2 is processed on the outer surface of the top end of the flagpole tube 1-1; Further, a counter bore 1-2 is processed on the outer surface of the bottom end of the flagpole tube 1-1, and the counter bore 1-2 is positioned below the contact position of the edge of the throttle plate 3 and the inner wall of the flagpole tube 1-1; further, a cigarette folding angle is arranged on the side face of the cigarette folding flag type screen 2; Further, the number of the coiled pipes 2-1 is equal to that of the flagpole pipes 1-1; Furthermore, the middle parts of every two coiled pipes 2-1 are welded and fixed through sealing steel plates 2-2; Further, the smoke folding flag type screen 2 is arranged at the inlet of the hearth outlet and the tail shaft, the convection flag type screen 4 is arranged at the lower part of the flagpole pipe group 1 in the hearth outlet and the tail shaft, the convection flag type screen 4 is communicated with the flagpole pipe group 1, the smoke folding flag type screen 2 is arranged at the bent angle of the flagpole pipe group 1, the smoke folding flag type screen 2 is communicated with the flagpole pipe group 1, the smoke folding angle is arranged on the side face of the smoke folding flag type screen 2, the smoke flow can be effectively divided, the abrasion condition of smoke to the root of the convection flag type screen 4 due to the action of inertia force is reduced, the smoke can uniformly pass through the whole convection flag type screen 4, heat exchange is enhanced, the convection heat exchange efficiency is improved, and the integral efficiency of the boiler is further improved. Compared with the prior art, the invention has the following beneficial effects: The invention overcomes the defects of the prior art, adopts the arrangement of the smoke folding flag type screen at the furnace outlet and the tail shaft inlet, and the lower parts of the flagpole tube group in the furnace outlet and the tail shaft are provided with the convection flag type screen which is communicated with the flagpole tube group, and the bent angle of the flagpole tube group is provided with the smoke folding flag type screen which is communicated with the flagpole tube group, and the smoke folding flag type screen is provided with the smoke folding angle at the side surface of the smoke folding flag type screen, so that the smoke flow can be