CN219588989U

CN219588989U - Boiler furnace explosion vent connecting device

Info

Publication number: CN219588989U
Application number: CN202320543541.3U
Authority: CN
Inventors: 侯鹏
Original assignee: Beijing Yangde Environmental Protection And Energy Technology Co ltd
Current assignee: Beijing Yangde Environmental Protection And Energy Technology Co ltd
Priority date: 2023-03-20
Filing date: 2023-03-20
Publication date: 2023-08-25
Anticipated expiration: 2033-03-20

Abstract

The utility model relates to the technical field of explosion vents, in particular to a boiler furnace explosion vent connecting device which can bear heat radiation of high-temperature smoke of a furnace and avoid high-temperature fatigue damage, comprising an explosion vent; the explosion-proof door is arranged in the rear smoke box, the smoke outlet of the back combustion chamber of the hearth is fixedly connected with the shell, the inner side of the shell is wrapped with the heat insulation layer, the positions of the shell and the heat insulation layer corresponding to the explosion-proof door are provided with the pore passages in a penetrating way, the smoke outlet of the back combustion chamber is communicated with the pore passages through the inner cavity of the heat insulation layer, and the explosion-proof door is connected with the pore passages through the connecting pipe; the heat-resistant temperature limit of the smoke is improved through the heat insulation effect of the heat insulation layer; the shell is not damaged by high-temperature oxidation in the operation process, the normal opening of the explosion door of the boiler furnace is ensured, other pressed parts such as the furnace and the like are prevented from being damaged when the boiler detonates and the pressure is excessive, the maintenance and replacement cost is reduced, the furnace shutdown risk is reduced, and the safe and efficient operation of the boiler is ensured.

Description

Boiler furnace explosion vent connecting device

Technical Field

The utility model relates to the technical field of explosion vents, in particular to a connecting device for an explosion vent of a boiler furnace.

Background

Some WNS series natural gas boilers which operate at present are manufactured by cast iron, the heat-resistant temperature is only 300 ℃, even if heat-resistant cast iron such as RTSi5 is used, the heat-resistant temperature is at most 700 ℃, the smoke temperature of a boiler hearth outlet can reach 1200 ℃, the existing hearth explosion door connecting device is positioned right behind the hearth, the whole hearth explosion door connecting device is positioned in a three-return smoke outlet smoke box, the smoke temperature is about 250 ℃, the appearance of the hearth explosion door connecting device cannot be effectively cooled, in the operation process, the hearth explosion door connecting device is continuously heated by high-temperature smoke, the cast iron of the hearth explosion door connecting device is damaged, the condition that the hearth explosion door connecting device is damaged by high-temperature radiation fatigue exists in the operation process, part of high-temperature smoke in the hearth enters the convection smoke tube outlet smoke box through cracks of the hearth explosion door connecting device, the smoke temperature of the boiler is increased, the temperature of a rear wall panel is increased, the natural gas consumption of a boiler is increased, the pressure of the boiler is not released, the safe operation and the efficiency of the boiler is greatly influenced, and the boiler is replaced by the original explosion door is replaced after the boiler is operated for one year.

Disclosure of Invention

In order to solve the technical problems, the utility model provides the boiler furnace explosion door connecting device capable of bearing the heat radiation of high-temperature flue gas of a furnace and avoiding high-temperature fatigue damage.

In order to achieve the above purpose, the utility model is realized by adopting the following technical scheme:

the utility model relates to a boiler furnace explosion door connecting device, which comprises an explosion door; the explosion-proof door is installed in the rear smoke box, the smoke outlet of the back combustion chamber of the hearth is fixedly connected with the shell, the inner side of the shell is wrapped with the heat insulation layer, the shell and the heat insulation layer are provided with the pore channel in a penetrating way corresponding to the explosion-proof door, the smoke outlet of the back combustion chamber is communicated with the pore channel through the inner cavity of the heat insulation layer, and the explosion-proof door is connected with the pore channel through the connecting pipe.

In a possible technical scheme, the shell is in a shape of , the explosion door is located on the upper side of the shell, and the pore canal is formed on the upper sides of the shell and the heat insulation layer.

In one possible technical solution, the heat-insulating layer includes an aluminum silicate fiber layer and a refractory concrete layer which are sequentially and fixedly connected with the inner side of the outer shell.

In a possible technical scheme, a plurality of grapples are evenly connected and arranged on the inner side of the shell, the grapples are L-shaped, one end of each grapple is embedded into the refractory concrete layer, and the other end of each grapple penetrates through the aluminum silicate fiber layer and is connected with the shell.

In one possible technical scheme, a fixing piece is arranged between the adjacent grapples, one end part of the fixing piece is embedded into the refractory concrete layer, and the other end of the fixing piece penetrates through the aluminum silicate fiber layer and is connected with the shell.

In one possible technical solution, the refractory concrete layer is internally embedded with steel wires.

Compared with the prior art, the utility model has the beneficial effects that: the inner side of the shell is wrapped with a heat insulation layer, and the heat-resistant temperature limit of the smoke is improved through the heat insulation effect of the heat insulation layer; the shell is not damaged by high-temperature oxidation in the operation process, so that the normal opening of the explosion door of the boiler hearth is ensured, other pressed parts such as the hearth and the like are prevented from being damaged when the boiler detonates and the pressure exceeds the pressure, the maintenance and replacement cost is reduced, the furnace shutdown risk is reduced, and the safe and efficient operation of the boiler is ensured; the connecting device can prevent the connecting device from high-temperature fatigue damage, the hearth explosion door can not work normally, and the smoke at the hearth outlet and the smoke at the convection smoke pipe outlet are prevented from being in series flow, so that the smoke discharging temperature is increased, and the boiler efficiency is reduced; the steam-water impact in the economizer pipe caused by the overhigh temperature of the flue gas entering the economizer at the tail part of the boiler is prevented.

Drawings

FIG. 1 is a schematic view of the positioning arrangement of the explosion door connection apparatus of the boiler furnace of the present utility model;

FIG. 2 is a schematic structural view of the boiler furnace explosion door connection apparatus of the present utility model;

reference numerals: 1. a housing; 2. an aluminum silicate fiber layer; 3. a grapple; 4. a fixing member; 5. a refractory concrete layer; 6. a connecting pipe; 7. an explosion door; 8. a rear smoke box.

Detailed Description

The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.

As shown in fig. 1 to 2, the boiler furnace explosion-proof door connecting device of the embodiment of the utility model is arranged at a smoke outlet of a back combustion chamber of the boiler furnace, a rear smoke box 8 is arranged at the rear side of the smoke outlet, and an explosion-proof door 7 is arranged in the rear smoke box 8; the existing boiler furnace is generally a waveform furnace arranged under, and is connected with a backfire chamber, and the waveform furnace is connected to the backfire chamber as a first return stroke; a threaded smoke pipe is annularly arranged between the backfire chamber and the front tube plate to serve as a second return stroke, and a third return stroke straight smoke pipe is symmetrically arranged outside the second return stroke threaded smoke pipe between the front tube plate and the rear tube plate of the boiler; the front and rear sides of the boiler are provided with smoke boxes, the front smoke box is used as a second return outlet smoke steering chamber, and the rear smoke box 8 is used as a third return smoke outlet; when the chamber combustion boiler using the fuel gas as the fuel is not operated in the ignition or operation process, the explosion of a hearth can be caused, the pressure in the furnace is increased, and when the pressure is increased to the opening pressure of the spring explosion door which is 4000Pa as usual, the pressure can be automatically opened for pressure relief, so that the safety of the boiler body is protected; when the explosion door is depressurized, the smoke enters the rear smoke box 8; in order to improve the high-temperature bearing performance of the explosion door connecting device, the shell 1 is fixedly connected at the smoke outlet of the back-fire chamber of the hearth, the shell 1 can be made of materials with high-temperature resistance, preferably metal plates are selected, and the method specifically comprises the steps of, but not limited to, steel plates, for example, steel plates with the thickness of 10mm and the material of 15CrMoR are selected for molding, the connecting mode of the shell 1 and the smoke outlet of the back-fire chamber can be any fixed connecting mode feasible in the prior art, and the connection needs to ensure complete sealing, for example, the shell 1 and the smoke outlet of the back-fire chamber are connected by fillet welding; the inner side of the shell 1 is wrapped and provided with a heat insulation layer, the heat insulation layer can be any heat insulation material with good high-temperature radiation resistance, and the heat-resistant temperature limit of smoke is improved through the heat insulation effect of the heat insulation layer; the shell 1 and the heat insulation layer are provided with a pore channel in a penetrating way at the position corresponding to the explosion-proof door 7, the smoke outlet of the backfire chamber is communicated with the pore channel through the inner cavity of the heat insulation layer, the explosion-proof door 7 is connected with the pore channel through a connecting pipe 6, the connecting pipe 6 is made of steel materials, for example, a steel plate with the thickness of 10mm and the material of 15CrMoR is formed, and the joint of the explosion-proof door and the pore channel is welded completely through fillet welding; when the pressure of the hearth is increased to the opening pressure of the explosion door 7, the flue gas is discharged into the connecting pipe 6 through the inner cavity of the heat insulation layer to the explosion door 7 for pressure relief, so that the safety of the boiler body is protected; when the explosion door 7 is depressurized, smoke enters the rear smoke box 8; this novel connecting device wholly makes the in-process shell 1 of operation not receive high temperature oxidation and damages, guarantees the normal opening of boiler furnace explosion vent, damages other pressurized parts such as furnace when avoiding boiler deflagration superpressure, has reduced maintenance replacement cost, has reduced the blowing out risk, guarantees the safety, the high-efficient operation of boiler.

Specifically, in this embodiment, the casing 1 is in a shape of , the open end of the casing is connected with the smoke outlet of the backfire chamber in a matching manner, the cavity of the casing is communicated with the backfire chamber after the heat insulation layer is wrapped inside the casing, the explosion-proof door 7 is positioned on the upper side of the casing 1, and the pore canal is formed on the upper sides of the casing 1 and the heat insulation layer; it should be understood that the housing 1 may be any other shape, and the specific shape may be specifically designed according to the shape of the boiler when it is embodied.

Preferably, the heat insulation layer comprises an aluminum silicate fiber layer 2 and a refractory concrete layer 5 which are fixedly connected with the inner side of the shell 1 in sequence, wherein the aluminum silicate fiber layer 2 has low heat conductivity at high temperature of about 1200 ℃, has certain heat radiation resistance and has relatively stable heat insulation effect; the refractory concrete is special concrete which can bear the action of high temperature for a long time and maintain the required physical and mechanical properties under the action of high temperature, and can bear the high temperature higher than 1300 ℃; the fire-resistant concrete layer 5 is in contact with the flue gas, so that the high temperature of the flue gas is resisted, the whole connecting device is prevented from being deformed at high temperature, the aluminum silicate fiber layer 2 is used outside the fire-resistant concrete layer 5 to play an excellent role in heat insulation, so that the whole fire-resistant concrete layer plays a role in heat insulation and deformation prevention on the shell 1, and fatigue damage and crack generation of the shell 1 are prevented to influence the function of the explosion-proof door; preferably, the thickness of the aluminium silicate fibre layer 2 is designed to ensure that the wall temperature of the housing does not exceed 520 ℃.

Specifically, a plurality of grapples 3 are evenly connected and arranged on the inner side of the shell 1, the grapples 3 are L-shaped, one end of each grapple 3 is embedded into the refractory concrete layer 5, the other end of each grapple 3 penetrates through the aluminum silicate fiber layer 2 and is connected with the shell 1, and the refractory concrete layer 5 and the aluminum silicate fiber layer 2 are fixedly connected through the rigidity effect of each grapple 3.

Preferably, in order to make the overall structure more stable, a fixing member 4 is disposed between the adjacent grapples 3, one end portion of the fixing member 4 is embedded inside the refractory concrete layer 5, and the other end portion passes through the aluminum silicate fiber layer 2 and is connected to the housing 1.

Further, in order to prevent the refractory concrete from falling off, steel wires are embedded in the refractory concrete layer 5, so that the structure is more reliable, and the service life of the whole device is prolonged.

In the operation process of the connecting device for the explosion door of the boiler furnace, the refractory concrete layer 5 and the aluminum silicate fiber layer 2 play a role in heat insulation and deformation prevention on the shell 1, so that the shell 1 is not damaged by high-temperature oxidation, the normal opening of the explosion door of the boiler furnace is ensured, and other pressed parts such as the furnace and the like are prevented from being damaged when the boiler knocks and has overpressure; when the pressure of the hearth is increased to the opening pressure of the explosion door 7, flue gas is discharged into the connecting pipe 6 through the inner cavity of the refractory concrete layer 5 to the explosion door 7 for pressure relief, so that the safety of the boiler body is protected; when the explosion door 7 is depressurized, smoke enters the rear smoke box 8; the whole novel connecting device enables the heat-resistant temperature of the shell to reach 520 ℃, and when the temperature of the hearth of the connecting device is 1200 ℃ and the external temperature is 250 ℃, the temperature of the shell is 488 ℃ and does not exceed the heat-resistant temperature of the shell steel plate; the connecting device is operated for more than two years, the burn-through phenomenon does not occur, and the burn-through situation occurs when the original explosion-proof door is used for one year.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.

Claims

1. The boiler hearth explosion door connecting device comprises an explosion door (7); the anti-explosion device is characterized in that the anti-explosion door (7) is installed in the rear smoke box (8), the smoke outlet of the back combustion chamber of the hearth is fixedly connected with the shell (1), the inner side of the shell (1) is wrapped with a heat insulation layer, the shell (1) and the heat insulation layer are correspondingly provided with the explosion door (7) in a penetrating way, the smoke outlet of the back combustion chamber is communicated with the duct through the inner cavity of the heat insulation layer, and the anti-explosion door (7) is connected with the duct through the connecting pipe (6).

2. The boiler furnace explosion vent connection device according to claim 1, wherein the shell (1) is shaped like a letter , the explosion vent (7) is positioned on the upper side of the shell (1), and the pore canal is formed on the upper sides of the shell (1) and the heat insulation layer.

3. The boiler furnace explosion door connection device according to claim 2, wherein the heat insulation layer comprises an aluminum silicate fiber layer (2) and a refractory concrete layer (5) which are fixedly connected with the inner side of the outer shell (1) in sequence.

4. A boiler furnace explosion vent connecting device as claimed in claim 3, wherein the inner side of the shell (1) is uniformly connected with a plurality of grapples (3), the grapples (3) are L-shaped, one end of each grapple (3) is embedded into the refractory concrete layer (5), and the other end of each grapple (3) penetrates through the aluminum silicate fiber layer (2) and is connected with the shell (1).

5. The boiler furnace explosion door connection device according to claim 4, wherein a fixing piece (4) is arranged between the adjacent grapples (3), one end part of the fixing piece (4) is embedded into the refractory concrete layer (5), and the other end part of the fixing piece penetrates through the aluminum silicate fiber layer (2) and is connected with the shell (1).

6. The boiler furnace explosion door connection apparatus according to claim 5, wherein steel wires are embedded inside the refractory concrete layer (5).