阅读说明：本技术 一种解决旋流燃烧器周围水冷壁结渣的系统 (System for solving problem of slag bonding of surrounding water-cooled wall of cyclone burner ) 是由 陈国辉 成汭珅 柳宏刚 周凌宇 周平 王志刚 于 2021-10-28 设计创作，主要内容包括：本发明公开了一种解决旋流燃烧器周围水冷壁结渣的系统,包括旋流燃烧器本体及热风源,其中,旋流燃烧器本体固定于水冷壁的前后墙上,旋流燃烧器本体中旋流燃烧器外二次风通道的外壁上设置有水冷壁保护热风出风喷口导向板,水冷壁上安装旋流燃烧器本体的壁面与所述水冷壁保护热风出风喷口导向板相平行,水冷壁保护热风出风喷口导向板与水冷壁之间形成水冷壁保护热风喷口,热风源的出口与水冷壁保护热风喷口相连通,该系统能够有效解决旋流燃烧器周围水冷壁结渣的问题。(The invention discloses a system for solving the problem of slag formation of a water-cooled wall around a cyclone burner, which comprises a cyclone burner body and a hot air source, wherein the cyclone burner body is fixed on the front wall and the rear wall of a water-cooled wall, a water-cooled wall protection hot air outlet nozzle guide plate is arranged on the outer wall of a secondary air channel outside the cyclone burner in the cyclone burner body, the wall surface on which the cyclone burner body is arranged on the water-cooled wall is parallel to the water-cooled wall protection hot air outlet nozzle guide plate, a water-cooled wall protection hot air nozzle is formed between the water-cooled wall protection hot air outlet nozzle guide plate and the water-cooled wall, and the outlet of the hot air source is communicated with the water-cooled wall protection hot air nozzle.)

1. The system is characterized by comprising a cyclone burner body and a hot air source, wherein the cyclone burner body is fixed on the front wall and the rear wall of a water-cooled wall (1), a water-cooled wall protection hot air outlet nozzle guide plate (13) is arranged on the outer wall of a secondary air channel (5) outside the cyclone burner in the cyclone burner body, the wall surface of the water-cooled wall (1) on which the cyclone burner body is installed is parallel to the water-cooled wall protection hot air outlet nozzle guide plate (13), a water-cooled wall protection hot air outlet nozzle is formed between the water-cooled wall protection hot air outlet nozzle guide plate (13) and the water-cooled wall (1), and the outlet of the hot air source is communicated with the water-cooled wall protection hot air nozzle.

2. The system for solving the problem of slag formation on the water-cooled wall around the cyclone burner as claimed in claim 1, wherein the hot air source comprises an air preheater outlet hot secondary air pipeline, a water-cooled wall protection hot air box (11) and a hot air booster fan (10), wherein the air preheater outlet hot secondary air pipeline is communicated with the water-cooled wall protection hot air box (11) through the hot air booster fan (10) and the water-cooled wall protection hot air box inlet (2), and the outlet of the water-cooled wall protection hot air box (11) is communicated with the water-cooled wall protection hot air nozzle.

3. The system for solving the problem of water wall slagging around the cyclone burner in claim 2, further comprising a coal mill outlet pulverized coal pipe and a secondary air large wind box (12);

the cyclone burner body comprises a cyclone burner primary air channel (7), a cyclone burner inner secondary air channel (6) and a cyclone burner outer secondary air channel (5), the cyclone burner primary air channel (7), the cyclone burner inner secondary air channel (6), the cyclone burner outer secondary air channel (5) and the water-cooled wall protection hot air box (11) are sequentially distributed from inside to outside, a secondary air large air box (12) is communicated with the cyclone burner outer secondary air channel (5) through a cyclone burner outer secondary air inlet (9) on the outer wall of the cyclone burner outer secondary air channel (5), and the cyclone burner outer secondary air channel (5) is communicated with the cyclone burner inner secondary air channel (6) through a cyclone burner inner secondary air inlet (8) on the outer wall of the cyclone burner inner secondary air channel (6); the inlet of the primary air channel (7) of the cyclone burner is connected with a pulverized coal pipe at the outlet of the coal mill;

the primary air channel (7) of the cyclone burner, the inner secondary air channel (6) of the cyclone burner and the outer secondary air channel (5) of the cyclone burner are all connected with a boiler furnace.

4. The system for solving the problem of the slag bonding of the water cooling wall around the cyclone burner as recited in claim 3, characterized in that an outer secondary air cyclone blade (3) is arranged in the outer secondary air channel (5) of the cyclone burner.

5. The system for solving the problem of the slag bonding of the water cooling wall around the cyclone burner as recited in claim 3, characterized in that an inner secondary air cyclone blade (4) is arranged in the secondary air channel (6) in the cyclone burner.

6. The system for solving the problem of slag formation on the water-cooled wall around the cyclone burner as claimed in claim 3, wherein during operation, hot secondary air output from a hot secondary air pipeline at the outlet of the air preheater is pressurized by the hot air booster fan (10), enters the hot air box (11) through the inlet (2) of the hot air box for protecting the water-cooled wall, and then enters the boiler furnace through the hot air nozzle for protecting the water-cooled wall, and because the wall surface of the cyclone burner body mounted on the water-cooled wall (1) is parallel to the guide plate (13) of the hot air outlet nozzle for protecting the water-cooled wall, the hot secondary air spreads around in a circular ring shape along the wall surface of the water-cooled wall (1), and a layer of hot air protective film is formed on the surface of the water-cooled wall (1) around the cyclone burner body.

Technical Field

The invention relates to a system for solving the problem of slag bonding of a water-cooled wall, in particular to a system for solving the problem of slag bonding of the water-cooled wall around a cyclone burner.

Background

Coal carbon is the fundamental energy of coal-fired thermal power generation enterprises. Chemical energy generated by coal combustion is converted into electric energy finally. Coal carbon is firstly ground into coal powder in a coal mill, then the coal powder is separated by a separator, and then the coal powder is conveyed to a boiler burner by an air-powder conveying system and enters a boiler hearth through a burner nozzle for combustion. There are two main types of large-scale coal-fired power plant burners: a direct flow burner and a swirl burner. The once-through burner is used for a tangential firing type boiler, and the cyclone burner is used for a wall firing type boiler. The cyclone burners of various domestic and foreign boiler plants have different styles and various varieties. The cyclone burner is widely applied to large coal-fired boilers and belongs to a mainstream combustion mode.

In the actual operation of the boiler provided with the cyclone burner, slag bonding occurs on the water-cooled wall around the nozzle of the cyclone burner. After the water-cooled wall around the burner nozzle is subjected to slagging, the surface of slag attached to the wall surface of the water-cooled wall becomes rough, the adhesion capability to ash in the furnace is enhanced, the heat exchange condition of the water-cooled wall around the burner is worsened, and the local heat load is increased. As operating time increases, burner area slagging increases and heat exchange conditions continue to deteriorate, eventually leading to burner port slagging or burnout. In severe cases, the furnace is forced to be shut down or operation accidents are caused.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a system for solving the problem of slag bonding of the water-cooled wall around the cyclone burner, which can effectively solve the problem of slag bonding of the water-cooled wall around the cyclone burner.

In order to achieve the purpose, the system for solving the problem of slag formation of the water-cooled wall around the cyclone burner comprises a cyclone burner body and a hot air source, wherein the cyclone burner body is fixed on the front wall and the rear wall of the water-cooled wall, a water-cooled wall protection hot air outlet nozzle guide plate is arranged on the outer wall of a secondary air channel outside the cyclone burner in the cyclone burner body, the wall surface on which the cyclone burner body is arranged on the water-cooled wall is parallel to the water-cooled wall protection hot air outlet nozzle guide plate, a water-cooled wall protection hot air nozzle is formed between the water-cooled wall protection hot air outlet nozzle guide plate and the water-cooled wall, and the outlet of the hot air source is communicated with the water-cooled wall protection hot air nozzle.

The hot air source comprises an air preheater outlet hot secondary air pipeline, a water-cooled wall protection hot air box and a hot air booster fan, wherein the air preheater outlet hot secondary air pipeline is communicated with the water-cooled wall protection hot air box through the hot air booster fan and an inlet of the water-cooled wall protection hot air box, and an outlet of the water-cooled wall protection hot air box is communicated with a hot air nozzle of the water-cooled wall protection.

The coal pulverizer also comprises a coal powder pipe at the outlet of the coal pulverizer and a secondary air large air box;

the cyclone burner body comprises a cyclone burner primary air channel, a cyclone burner inner secondary air channel and a cyclone burner outer secondary air channel, the cyclone burner primary air channel, the cyclone burner inner secondary air channel, the cyclone burner outer secondary air channel and the water-cooled wall protection hot air box are sequentially distributed from inside to outside, a secondary air large air box is communicated with the cyclone burner outer secondary air channel through a cyclone burner outer secondary air inlet on the outer wall of the cyclone burner outer secondary air channel, and the cyclone burner outer secondary air channel is communicated with the cyclone burner inner secondary air channel through a cyclone burner inner secondary air inlet on the outer wall of the cyclone burner inner secondary air channel; the inlet of the primary air channel of the cyclone burner is connected with a pulverized coal pipe at the outlet of the coal mill;

the primary air channel of the cyclone burner, the secondary air channel in the cyclone burner and the secondary air channel outside the cyclone burner are all connected with a boiler furnace.

An outer secondary air swirl blade is arranged in the outer secondary air channel of the swirl burner.

An inner secondary air swirl blade is arranged in the secondary air channel in the swirl burner.

When the boiler works, hot secondary air output by a hot secondary air pipeline at the outlet of the air preheater is pressurized by the hot air booster fan and then enters the water-cooled wall protection hot air box through the inlet of the water-cooled wall protection hot air box, and then enters the boiler furnace through the water-cooled wall protection hot air nozzle.

The invention has the following beneficial effects:

when the system for solving the problem of slag formation of the water-cooled wall around the cyclone burner is operated, a water-cooled wall protection hot air outlet nozzle guide plate is arranged on the outer wall of a secondary air channel outside the cyclone burner in a cyclone burner body, the wall surface of the cyclone burner body arranged on the water-cooled wall is parallel to the water-cooled wall protection hot air outlet nozzle guide plate, a water-cooled wall protection hot air nozzle is formed between the water-cooled wall protection hot air outlet nozzle guide plate and the water-cooled wall, hot air is sprayed into a boiler furnace through the water-cooled wall protection hot air nozzle during operation, wherein the wall surface of the hot air adhered to the water-cooled wall is diffused towards the periphery in a circular ring shape, so that a layer of hot air protection film is formed on the surface of the water-cooled wall around the cyclone burner body, and the hot air protection film can prevent ash burnt in a furnace from adhering to the wall surface of the water-cooled wall in an effective protection range of the hot air protection film, so as to protect the wall surface of the water-cooled wall, on the one hand, the local heat load of the water-cooled wall around the nozzle is reduced, the slag bonding of the water-cooled wall around the nozzle is prevented, on the other hand, the wall surface atmosphere of the water-cooled wall can be improved, so that the reducing atmosphere near the wall surface of the water-cooled wall is reduced, and the risk of high-temperature corrosion of the water-cooled wall is greatly reduced.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Wherein, 1 is a water-cooled wall, 2 is an inlet of a water-cooled wall protection hot air box, 3 is an outer secondary air swirl blade, 4 is an inner secondary air swirl blade, 5 is an outer secondary air channel of a swirl burner, 6 is an inner secondary air channel of the swirl burner, 7 is a primary air channel of the swirl burner, 8 is an inner secondary air inlet of the swirl burner, 9 is an outer secondary air inlet of the swirl burner, 10 is a hot air booster fan, 11 is a water-cooled wall protection hot air box, 12 is a secondary air large air box, and 13 is a water-cooled wall protection hot air outlet nozzle guide plate.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.

Referring to fig. 1, the system for solving the problem of slag formation on the water-cooled wall around the cyclone burner comprises a cyclone burner body, a secondary air big air box 12, a water-cooled wall protection hot air box 11 and a coal pulverizer outlet pulverized coal pipe, wherein the cyclone burner body is fixed on the front wall and the rear wall of the water-cooled wall 1, the cyclone burner body comprises a cyclone burner primary air channel 7, a cyclone burner inner secondary air channel 6 and a cyclone burner outer secondary air channel 5, and the cyclone burner primary air channel 7, the cyclone burner inner secondary air channel 6, the cyclone burner outer secondary air channel 5 and the water-cooled wall protection hot air box 11 are sequentially distributed from inside to outside;

the secondary air large air box 12 is communicated with the cyclone burner outer secondary air channel 5 through a cyclone burner outer secondary air inlet 9 on the outer wall of the cyclone burner outer secondary air channel 5, and the cyclone burner outer secondary air channel 5 is communicated with the cyclone burner inner secondary air channel 6 through a cyclone burner inner secondary air inlet 8 on the outer wall of the cyclone burner inner secondary air channel 6; the inlet of the primary air channel 7 of the cyclone burner is connected with a pulverized coal pipe at the outlet of the coal mill;

the primary air channel 7 of the cyclone burner, the secondary air channel 6 in the cyclone burner and the secondary air channel 5 outside the cyclone burner are all connected with a boiler hearth;

an outer secondary air swirl blade 3 is arranged in the outer secondary air channel 5 of the swirl burner; an inner secondary air swirl blade 4 is arranged in the secondary air channel 6 in the swirl burner;

the outer wall of the secondary air channel 5 outside the cyclone burner is provided with a water-cooled wall protecting hot air outlet nozzle guide plate 13, the wall surface of the water-cooled wall 1 on which the cyclone burner body is arranged is parallel to the water-cooled wall protecting hot air outlet nozzle guide plate 13, a water-cooled wall protecting hot air outlet nozzle is formed between the water-cooled wall protecting hot air outlet nozzle guide plate 13 and the water-cooled wall 1, an outlet hot secondary air pipeline of the air preheater is communicated with a water-cooled wall protecting hot air box 11 through a hot air booster fan 10 and a water-cooled wall protecting hot air box inlet 2, and an outlet of the water-cooled wall protecting hot air box 11 is communicated with a water-cooled wall protecting hot air nozzle.

The specific working process of the invention is as follows:

in the operation of the boiler, hot secondary air from an air preheater is pressurized by a hot air booster fan 10 and then enters a water-cooled wall protection hot air box 11 through a water-cooled wall protection hot air box inlet 2, and then enters a boiler hearth through a water-cooled wall 1 and a water-cooled wall protection hot air outlet nozzle guide plate 13 to form a water-cooled wall protection hot air nozzle which is formed between the water-cooled wall 1 and the water-cooled wall protection hot air outlet nozzle guide plate 13, because the wall surface of a cyclone burner body arranged on the water-cooled wall 1 is parallel to the water-cooled wall protection hot air outlet nozzle guide plate 13, hot air can be spread around in a circular shape by adhering to the wall surface of the water-cooled wall 1, so that a layer of hot air protection film is formed on the surface of the water-cooled wall 1 around the cyclone burner body, the hot air protection film can prevent hot ash in the boiler from adhering to the wall surface of the water-cooled wall 1 in an effective protection range, thereby protecting the wall surface of the water-cooled wall 1 and reducing the local heat load of the water-cooled wall 1 around the nozzle on the one hand, prevent the slagging scorification of water-cooled wall 1 around the spout, on the other hand can improve water-cooled wall 1 wall surface atmosphere, make near water-cooled wall 1 wall surface reducing atmosphere reduce to greatly reduced water-cooled wall 1 high temperature corrosion's risk.

Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.