Anti-backfire device of biomass boiler

Abstract

The utility model discloses an anti-backfire device of a biomass boiler, and relates to the field of anti-backfire devices of biomass boilers. The anti-backfire device of the biomass boiler comprises a boiler hearth, a screw feeder and an anti-backfire box, and a feeding channel is formed in the anti-backfire box; an air exhaust box is installed on the side face of the anti-backfire box, a cavity chamber communicated with the feeding channel is formed in the air exhaust box, and an air exhaust pipe is arranged on the side face of the air exhaust box. According to the anti-backfire device of the biomass boiler, air in the cavity chamber and the feeding channel is pumped out to the outside through the exhaust pipe, so that oxygen in the feeding channel and the cavity chamber is rarefied, a large amount of flames cannot be backflamed towards the feeding channel and the cavity chamber during combustion in the boiler hearth, and even if a small amount of backfire exists, the backfire of the biomass boiler can be prevented. When the exhaust pipe exhausts air, the air flow in the feeding channel moves towards the cavity chamber, so that flames are driven towards the cavity chamber during tempering.

Description

Technical Field

[0001] The utility model relates to the technical field of biomass boilers, in particular to a biomass boiler backfire prevention device. Background Art

[0002] Biomass boiler is a type of boiler. A boiler that uses biomass energy as fuel is called a biomass boiler. It is divided into biomass steam boiler, biomass hot water boiler, biomass hot air furnace, biomass thermal oil furnace, vertical biomass boiler, horizontal biomass boiler, etc.

[0003] The combustion raw materials of biomass boilers are often biomass pellets, and a screw feeder is generally installed on the top of the biomass boiler. The screw feeder is used to facilitate the feeding of the inside of the biomass boiler, and on the other hand, it can prevent the top of the biomass boiler from backfired to a certain extent.

[0004] However, during use, although the screw feeder has a long internal space, if the fire inside the biomass boiler is large, the flame may still enter the interior of the screw feeder and cause damage to the internal components of the screw feeder. There is even a situation where the flame burns along the internal space of the screw feeder to the feed port of the screw feeder. Therefore, the present application proposes a biomass boiler backfire prevention device. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a biomass boiler backfire prevention device, which solves the problem that if the fire inside the biomass boiler is large, the flame may still enter the interior of the screw feeder and cause damage to the internal components of the screw feeder.

[0006] To achieve the above purpose, the utility model is implemented through the following technical solutions: a biomass boiler anti-flashback device, comprising a boiler furnace, a screw feeder and an anti-flashback box, the top of the boiler furnace is connected to the screw feeder through the anti-flashback box, a feed channel is opened inside the anti-flashback box, and the bottom and top of the feed channel are respectively connected to the inside of the corresponding boiler furnace and the inside of the screw feeder;

[0007] An exhaust box is installed on the side of the anti-backfire box, and a cavity connected to the feed channel is opened inside the exhaust box. An exhaust pipe is arranged on the side of the exhaust box, and one end of the exhaust pipe is connected to an external air pump;

[0008] A guide block is fixedly mounted on the inner side wall of the feed channel, and inclined surfaces are provided below and above the guide block. The guide block is arranged in the form of a boss and corresponds to the cavity.

[0009] Preferably, a protective tube extends from the side of the vacuum box, and a connecting tube is installed at the end of the protective tube.

[0010] Preferably, the other end of the connecting pipe is connected to the exhaust pipe through a joint.

[0011] Preferably, the inner bottom wall of the cavity is provided with a slideway sloping downward toward the anti-backfire box.

[0012] Preferably, a fireproof and heat-insulating layer is fixedly installed on the inner wall of the cavity.

[0013] Preferably, a spiral feed blade is provided inside the spiral feeder, and the spiral feeder is powered by an external power supply.

[0014] The utility model discloses a biomass boiler backfire prevention device, which has the following beneficial effects:

[0015] During the use of the biomass boiler anti-backfire device, when the spiral feeder is feeding into the boiler furnace, the combustion raw materials first enter the feed channel inside the anti-backfire box, and during the feeding process, the exhaust pipe draws the air inside the cavity and the feed channel to the outside, thereby making the oxygen in the feed channel and the cavity relatively thin. Therefore, when the boiler furnace is burning, the flame will not be flashed toward the feed channel and the cavity in large quantities. Even if there is a small amount of flashback, because the airflow in the feed channel moves toward the cavity when the exhaust pipe is pumping air, the flame is also driven toward the cavity during flashback, thereby reducing the flashback phenomenon in the spiral feeder. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 It is a structural sectional view of the utility model;

[0019] Figure 3 For this utility model Figure 2 A magnified schematic diagram of part A in FIG.

[0020] In the figure: 1. boiler furnace; 2. screw feeder; 3. anti-backfire box; 301. feed channel; 302. guide block; 4. exhaust box; 401. cavity; 402. protection pipe; 403. exhaust pipe; 404. connecting pipe; 405. slideway; 406. fireproof and heat-insulating layer. DETAILED DESCRIPTION

[0021] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] The utility model embodiment discloses a biomass boiler backfire prevention device, according to the attached Figure 1 As shown in FIG. 3 , the boiler furnace 1 includes a screw feeder 2 and an anti-flashback box 3. The top of the boiler furnace 1 is connected to the screw feeder 2 via the anti-flashback box 3. A feed channel 301 is provided inside the anti-flashback box 3. The bottom and top of the feed channel 301 are respectively connected to the inside of the boiler furnace 1 and the inside of the screw feeder 2.

[0023] An exhaust box 4 is installed on the side of the anti-tempering box 3. A cavity 401 connected to the feed channel 301 is provided inside the exhaust box 4. An exhaust pipe 403 is provided on the side of the exhaust box 4, and one end of the exhaust pipe 403 is connected to an external air pump.

[0024] During use, when the screw feeder 2 is feeding into the boiler furnace 1, the combustion raw materials first enter the feed channel 301 inside the anti-backfire box 3, and during the feeding process, the exhaust pipe 403 draws the air inside the cavity 401 and the feed channel 301 to the outside, thereby making the oxygen in the feed channel 301 and the cavity 401 relatively thin. When the boiler furnace 1 is burning, the flame will not be backfired in large quantities toward the feed channel 301 and the cavity 401. Even if there is a small amount of backfire, because the airflow in the feed channel 301 moves toward the cavity 401 when the exhaust pipe 403 is exhausting air, the flame is also driven toward the cavity 401 during backfire, thereby reducing the backfire phenomenon in the screw feeder 2.

[0025] It is particularly disclosed that a guide block 302 is fixedly installed on the inner side wall of the feed channel 301 , and inclined surfaces are provided below and above the guide block 302 . The guide block 302 is arranged in a boss shape and corresponds to the cavity 401 .

[0026] By setting up the guide block 302, since a slope is provided on the top of the guide block 302, during the material feeding process, the burning raw materials are offset toward the empty chamber 401 inside the exhaust box 4, which makes it easier for the exhaust pipe 403 to draw air from the feed channel 301 into the empty chamber 401. At the same time, a slope is provided on the bottom of the guide block 302. When backfire occurs, the flame is also offset toward the empty chamber 401, and it is not easy to enter the interior of the screw feeder 2 vertically upward.

[0027] Furthermore, a protective tube 402 is extended from the side of the air extraction box 4, and a connecting tube 404 is installed at the end of the protective tube 402, and the other end of the connecting tube 404 is connected to the air extraction pipe 403 through a joint.

[0028] Since the internal temperature of the exhaust box 4 is relatively high, a protective tube 402 and a connecting tube 404 are provided between the exhaust box 4 and the exhaust pipe 403, thereby effectively protecting the exhaust pipe 403 and preventing the exhaust pipe 403 from being damaged by heat. At the same time, the connecting tube 404 facilitates the installation and disassembly of the exhaust pipe 403.

[0029] Furthermore, a slideway 405 slanting downward toward the anti-backfire box 3 is provided on the inner bottom wall of the hollow chamber 401 .

[0030] By setting up the slide 405, since there is an inclined surface on the top of the guide block 302, the combustion raw materials are offset toward the empty chamber 401 inside the vacuum box 4 during the feeding process. When the combustion raw materials enter the empty chamber 401, they directly fall into the slide 405, and then slide on the slide 405 to the anti-backfire box 3, thereby avoiding the accumulation of combustion raw materials.

[0031] Furthermore, a fireproof and heat-insulating layer 406 is fixedly installed on the inner wall of the cavity 401 . By setting the fireproof and heat-insulating layer 406 , the fireproof and heat-insulating layer 406 can play a role of fireproofing and heat-insulating the vacuum box 4 .

[0032] Furthermore, a spiral feed blade is provided inside the spiral feeder 2, and the spiral feeder 2 is powered by an external power supply, and the external power supply powers the driving motor. When the motor is working, it drives the spiral feed blade to rotate, so that the combustion raw materials inside the spiral feeder 2 can be transported horizontally until the combustion raw materials are transported to the feeding channel 301.

[0033] During use, when the screw feeder 2 is feeding into the boiler furnace 1, the combustion raw materials first enter the feed channel 301 inside the anti-backfire box 3, and during the feeding process, the exhaust pipe 403 draws the air inside the cavity 401 and the feed channel 301 to the outside, thereby making the oxygen in the feed channel 301 and the cavity 401 relatively thin. When the boiler furnace 1 is burning, the flame will not be backfired in large quantities toward the feed channel 301 and the cavity 401. Even if there is a small amount of backfire, because the airflow in the feed channel 301 moves toward the cavity 401 when the exhaust pipe 403 is exhausting air, the flame is also driven toward the cavity 401 during backfire, thereby reducing the backfire phenomenon in the screw feeder 2.

[0034] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A biomass boiler anti-flashback device, comprising a boiler furnace (1), a screw feeder (2) and an anti-flashback box (3), wherein the top of the boiler furnace (1) is connected to the screw feeder (2) via the anti-flashback box (3), characterized in that: A feed channel (301) is provided inside the anti-backfire box (3), and the bottom and top of the feed channel (301) are respectively connected to the inside of the corresponding boiler furnace (1) and the inside of the screw feeder (2); An exhaust box (4) is installed on the side of the anti-backfire box (3), and a cavity (401) connected to the feed channel (301) is provided inside the exhaust box (4). An exhaust pipe (403) is provided on the side of the exhaust box (4), and one end of the exhaust pipe (403) is connected to an external air pump; A guide block (302) is fixedly mounted on the inner side wall of the feed channel (301), and inclined surfaces are provided below and above the guide block (302). The guide block (302) is arranged in the form of a boss and corresponds to the cavity (401).

2. A biomass boiler backfire prevention device according to claim 1, characterized in that: A protective pipe (402) extends from the side of the vacuum box (4), and a connecting pipe (404) is installed at the end of the protective pipe (402).

3. A biomass boiler backfire prevention device according to claim 2, characterized in that: One end of the connecting pipe (404) is connected to the exhaust pipe (403) via a joint.

4. The biomass boiler backfire prevention device according to claim 1, characterized in that: The inner bottom wall of the hollow chamber (401) is provided with a slideway (405) inclined downward toward the anti-backfire box (3).

5. The biomass boiler backfire prevention device according to claim 1, characterized in that: A fireproof and heat-insulating layer (406) is fixedly installed on the inner wall of the hollow chamber (401).

6. The biomass boiler backfire prevention device according to claim 1, characterized in that: The screw feeder (2) is provided with a screw feed blade inside, and the screw feeder (2) is powered by an external power supply.

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