Vertical water tube boiler applicable to water-cooled premixed flat-flame burner

Abstract

Disclosed in the present invention is a vertical water tube boiler applicable to a water-cooled premixed flat-flame burner. The vertical water tube boiler comprises a boiler body, wherein a first furnace, a second furnace and a water tube group are provided in the boiler body, an upper partition plate is provided at the bottom of the first furnace, and a lower partition plate is provided at the top of the second furnace; an isolation belt is provided on an outer side of the water tube group, the top end of the water tube group passes through the upper partition plate to be in communication with the first furnace, and the bottom end of the water tube group passes through the lower partition plate to be in communication with the second furnace; and an air intake device is provided on one side of the water tube group, and is configured to lead intake gas to the water tube group. In the present invention, there is no need to additionally provide an outer cylinder between the first furnace and the second furnace for reinforcement, so that the steel consumption of the boiler is greatly reduced.

Description

A vertical water tube boiler suitable for water-cooled premixed flat burners Technical Field

[0001] The present invention relates to the technical field of gas boilers, and in particular to a vertical water tube boiler suitable for a water-cooled premixed plane burner. Background Art

[0002] Traditional burners have large flames and require a large combustion space. Traditional boilers use conventional flue gas convection heat transfer, which has low heat exchange efficiency and requires a large heat exchange area. Traditional boilers are large in size, complicated in structure, and consume a lot of metal.

[0003] Summary of the Invention

[0004] The purpose of the present invention is to disclose a vertical water tube boiler suitable for a water-cooled premixed flat burner, which eliminates the traditional middle outer cylinder and greatly reduces the boiler steel consumption.

[0005] The present invention solves the technical problem by adopting the following technical solution: a vertical water tube boiler suitable for a water-cooled premixed flat burner, comprising a boiler furnace body, wherein a first furnace body, a second furnace body, and a water tube group are arranged in the boiler furnace body, an upper partition is arranged at the bottom of the first furnace body, and a lower partition is arranged at the top of the second furnace body;

[0006] An isolation zone is provided on the outside of the water pipe group. The top ends of the water pipe group pass through the upper partition plate to communicate with the first furnace body, and the bottom ends of the water pipe group pass through the lower partition plate to communicate with the second furnace body. An air intake device is provided on one side of the water pipe group, and the air intake device is used to pass the intake gas into the water pipe group.

[0007] A plurality of parallel steel plates are connected between the first furnace body and the second furnace body. The top ends of the plurality of steel plates are fixedly connected to the first furnace body, and the bottom ends are fixedly connected to the second furnace body.

[0008] Optionally, the isolation zone is used for heat insulation, and the isolation zone adopts a fire-resistant partition or a membrane wall;

[0009] A plurality of parallel steel plates are connected between the first furnace body and the second furnace body. The top ends of the plurality of steel plates are fixedly connected to the first furnace body, and the bottom ends are fixedly connected to the second furnace body.

[0010] Optionally, a plurality of first reinforcing ribs are provided in the first furnace body, the first reinforcing ribs including a first transverse region and a first vertical region, the first transverse region being fixedly connected to the top surface of the upper partition, the first vertical region being fixedly connected to the inner side wall of the first furnace body, and the first transverse region and the first vertical region being integrally formed;

[0011] A plurality of second reinforcing ribs are provided in the second furnace body, and the second reinforcing ribs include a second transverse region and a second vertical region. The second transverse region is fixedly connected to the bottom surface of the lower partition, and the second vertical region is fixedly connected to the inner side wall of the second furnace body.

[0012] Optionally, the first reinforcing ribs, the second reinforcing ribs and the steel plate are arranged correspondingly, and the cross-section of the steel plate, the area of ​​the first transverse region and the area of ​​the second transverse region are the same.

[0013] Optionally, the air intake device includes a mixer, a mixing cavity, and an air-distributing orifice plate. The mixer is used to premix air and gas and then pass them into the mixing cavity. The mixing cavity mixes the gases introduced and then passes them through the air-distributing orifice plate to evenly distribute the gases before passing them into the water-cooling tube group.

[0014] The mixer is provided with a first air inlet valve and a second air inlet valve, the first air inlet valve is used to control the air to flow into the mixer, and the second air inlet valve is used to control the gas to flow into the mixer;

[0015] A water cooling tube group and a flame arrester are provided on the side of the air-distributing plate away from the mixing cavity. The water cooling tube group consists of a plurality of water cooling tubes arranged in parallel, and a flame arrester is provided between two adjacent water cooling tubes.

[0016] Optionally, the flame arrester includes a plurality of metal corrugated plates, which are staggered and stacked, and the corrugations between adjacent metal corrugated plates form a plurality of independent small cavity channels. The flame arrester connects the mixing cavity with the furnace through the small cavity channels between the corrugated plates.

[0017] Optionally, the water pipe group includes a first water pipe group and a second water pipe group, the first water pipe group is arranged near the air intake device, and the second water pipe group is arranged on a side of the first water pipe group away from the air intake device.

[0018] Optionally, a steam exhaust port is provided at the top of the first furnace body, a water inlet pipe is provided on one side of the lower part of the side of the first furnace body, the water inlet pipe runs through the first furnace body, and the first furnace body is also provided with an upper inspection manhole, a safety valve, a liquid level gauge pipe seat, and a vent pipe;

[0019] A sewage outlet and a sewage drainer are provided at the bottom end of the second furnace body. The sewage outlet passes through the furnace wall of the second furnace body and is connected to the sewage drainer. A lower maintenance manhole is also provided on the second furnace body.

[0020] Optionally, an air distribution hole plate is further provided in the first furnace body, and the air distribution hole plate is axially fixedly connected to the inner wall of the first furnace body, and the steam exhaust port, safety valve and vent pipe are arranged above the air distribution hole plate.

[0021] Optionally, the first water tube group includes a plurality of small-diameter smooth tubes that are vertically connected and arranged in parallel, and the second water tube group includes a plurality of spiral fin tube groups or large-diameter smooth tube groups or a spiral fin tube group and a large-diameter smooth tube group that are vertically connected and arranged in parallel.

[0022] The present invention has the following beneficial effects:

[0023] 1. The boiler body of this invention eliminates the bulky furnace and traditional heat exchange surface, resulting in a compact overall structure, small footprint, and low metal steel consumption. Independent reinforcing ribs are installed inside the first and second furnace bodies of the boiler body to enhance the structural stability of the cylinders themselves. No additional outer cylinder is required to reinforce the first and second furnace bodies, further reducing boiler steel consumption.

[0024] 2. The boiler body of the present invention adopts a vertical straight water pipe group structure and a natural circulation mode, eliminating the cumbersome structures such as traditional headers and connecting pipes. It has a simple and compact structure and low steel consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG1 is a schematic diagram of the overall structure of the present invention;

[0026] FIG2 is a schematic diagram of the arrangement of the first furnace body reinforcement ribs of the boiler furnace body of the present invention;

[0027] FIG3 is a schematic diagram of the arrangement of the second furnace body reinforcement ribs of the boiler furnace of the present invention;

[0028] FIG4 is a schematic diagram of an AA cross-section of an embodiment of FIG1 ;

[0029] FIG5 is a schematic AA cross-sectional view of another embodiment of FIG1 ;

[0030] FIG6 is a cross-sectional view of an embodiment of a boiler furnace body of the present invention;

[0031] FIG7 is a cross-sectional view of an embodiment of a boiler furnace body of the present invention;

[0032] FIG8 is a side view of the mixing cavity and the uniform air hole plate of the present invention;

[0033] FIG9 is a partial enlarged view of the spiral finned tube of the present invention;

[0034] FIG10 is a schematic structural diagram of a flame arrester according to the present invention;

[0035] Figure 11 is a front view of the first reinforcing rib in the present invention;

[0036] Figure 12 is a front view of the second reinforcing rib in the present invention

[0037] The markings in the figure are as follows: 1- boiler body; 11- first body; 12- second body; 13- water pipe group; 14- isolation zone;

[0038] 111 - Upper baffle; 112 - First reinforcement rib; 113 - Steam exhaust port; 114 - Water inlet pipe; 115 - Upper inspection manhole; 116 - Safety valve; 117 - Liquid level gauge pipe seat; 118 - Vent pipe; 119 - Air equalizing plate; 121 - Lower baffle; 122 - Second reinforcement rib; 123 - Drain port; 124 - Drain drain; 125 - Lower inspection manhole; 131 - First water pipe group; 132 - Second water pipe group; 1121 - First horizontal area; 1122 - First vertical area; 1221 - Second horizontal area; 1222 - Second vertical area.

[0039] 2-air intake device; 21-mixer; 22-mixing cavity; 23-gas uniformity plate; 211-first air intake valve; 212-second air intake valve; 231-water cooling tube group; 232-flame arrester; 2321-metal corrugated plate; 2322-small cavity channel;

[0040] 3-Steel plate. DETAILED DESCRIPTION

[0041] The technical solution of the present invention is further described below in conjunction with the embodiments and drawings.

[0042] Example 1

[0043] This embodiment provides a vertical water tube boiler suitable for a water-cooled premixed flat burner, including a boiler furnace 1, wherein a first furnace body 11, a second furnace body 12, and a water tube group 13 are provided within the boiler furnace. An upper partition 111 is provided at the bottom of the first furnace body 11, and a lower partition 121 is provided at the top of the second furnace body 12.

[0044] An isolation zone 14 is provided on the outside of the water pipe group 13. The top ends of the water pipe group 13 pass through the upper partition 111 to communicate with the first furnace body 11, and the bottom ends of the water pipe group 13 pass through the lower partition 121 to communicate with the second furnace body 12. An air intake device 2 is provided on one side of the water pipe group 13, and the air intake device 2 is used to pass the intake gas to the water pipe group 13.

[0045] The boiler body eliminates the bulky furnace and traditional heat exchange surface, and the overall structure is compact, occupies a small area, and has low metal steel consumption. There is no need to reinforce the first furnace body 11 and the second furnace body 12 by adding an additional outer cylinder, which greatly reduces the steel consumption required for boiler production.

[0046] In a further embodiment of this embodiment, the isolation zone 14 is used for heat insulation, and the isolation zone 14 adopts a fire-resistant partition or a membrane wall;

[0047] A plurality of parallel steel plates 3 are connected between the first furnace body 11 and the second furnace body 12 . The top ends of the plurality of steel plates 3 are fixedly connected to the first furnace body 11 , and the bottom ends are fixedly connected to the second furnace body 12 .

[0048] In a further embodiment of this embodiment, a plurality of first reinforcing ribs 112 are provided in the first furnace body 11. The first reinforcing ribs 112 include a first transverse region 1121 and a first vertical region 1122. The first transverse region 1121 is fixedly connected to the top surface of the upper partition 111, and the first vertical region 1122 is fixedly connected to the inner side wall of the first furnace body 11. The first transverse region 1121 and the first vertical region 1122 are integrally formed.

[0049] A plurality of second reinforcing ribs 122 are provided in the second furnace body 12. The second reinforcing ribs 122 include a second transverse region 1221 and a second vertical region 1222. The second transverse region 1221 is fixedly connected to the bottom surface of the lower partition 121, and the second vertical region 1222 is fixedly connected to the inner wall of the second furnace body 12.

[0050] In a further implementation of this embodiment, the first reinforcing rib 112, the second reinforcing rib 122 and the steel plate 3 are arranged correspondingly, and the cross section of the steel plate 3, the area of ​​the first transverse region 1121 and the area of ​​the second transverse region 1221 are the same.

[0051] It can achieve the highest cost-effectiveness by strengthening the structural stability of the cylinder itself and save steel consumption.

[0052] In a further embodiment of this embodiment, the air intake device 2 includes a mixer 21, a mixing cavity 22, and an air-distributing orifice plate 23. The mixer 21 is used to premix air and gas and then pass them into the mixing cavity 22. The mixing cavity 22 mixes the gases introduced and then evenly distributes the gases through the air-distributing orifice plate 23 and then passes them to the water-cooling pipe group 231.

[0053] The mixer 21 is provided with a first air inlet valve 211 and a second air inlet valve 212. The first air inlet valve 211 is used to control the flow of air into the mixer 21, and the second air inlet valve 212 is used to control the flow of gas into the mixer 21.

[0054] A water cooling tube group 231 and a flame arrester 232 are provided on the side of the air-distributing plate 23 away from the mixing cavity 22. The water cooling tube group 231 is composed of a plurality of parallel water cooling tubes, and a flame arrester 232 is provided between two adjacent water cooling tubes.

[0055] In a further implementation manner of this embodiment, the flame arrester 232 includes a plurality of metal corrugated plates 2321, and the plurality of metal corrugated plates 2321 are staggered and stacked, and the corrugations between adjacent metal corrugated plates 2321 form a plurality of independent small cavity channels 2322. The flame arrester 232 connects the mixing cavity 22 with the furnace through the small cavity channels 2322 between the corrugated plates 2321.

[0056] In a further implementation of this embodiment, the water pipe group 13 includes a first water pipe group 131 and a second water pipe group 132 . The first water pipe group 131 is arranged near the air intake device 2 , and the second water pipe group 132 is arranged on a side of the first water pipe group 131 away from the air intake device 2 .

[0057] In a further embodiment of this embodiment, a steam exhaust port 113 is provided at the top of the first furnace body 11, and a water inlet pipe 114 is provided on one side of the lower side of the first furnace body 11. The water inlet pipe 114 is connected to the first furnace body 11 by passing through the side wall of the first furnace body 11. The first furnace body 11 is also provided with an upper inspection manhole 115, a safety valve 116, a liquid level gauge pipe seat 117, and a vent pipe 118.

[0058] A sewage outlet 123 and a sewage drainer 124 are provided at the bottom end of the second furnace body 12 . The sewage outlet 123 passes through the furnace wall of the second furnace body 12 and is connected to the sewage drainer 124 . A lower maintenance manhole 125 is also provided on the second furnace body 12 .

[0059] In a further implementation manner of this embodiment, an air equalizing plate 119 is further provided in the first furnace body 11, and the air equalizing plate 119 is axially fixedly connected to the inner wall of the first furnace body 11, and the steam exhaust port 113, the safety valve 116 and the vent pipe 118 are arranged above the air equalizing plate 119.

[0060] In a further implementation of this embodiment, the first water tube group 131 includes a plurality of small-diameter light tubes that are vertically connected and arranged in parallel, and the second water tube group 132 includes a plurality of spiral fin tube groups or large-diameter light tube groups or a spiral fin tube group and a large-diameter light tube group that are vertically connected and arranged in parallel.

[0061] In the present invention, the boiler body adopts a vertical straight water tube group structure and a natural circulation mode, and comprises three parts: a first furnace body 11 , an intermediate tube group (ie, a water tube group 13 ), and a second furnace body 12 .

[0062] The water tube group 13 is divided into a water-cooled tube group, a bare tube, a spiral fin tube and a membrane wall group according to different ambient temperatures and functions. No outer cylinder is required on the outside of the water tube group 13.

[0063] In order to adapt to the serialization and large-scale design of boilers, the boiler intermediate tube group can be provided with one or more water-cooling tube groups and corresponding one or more air intake devices 2 for cooperating with the burner.

[0064] The air intake device 2 of the boiler is a device for fuel distribution and combustion, and is mainly composed of a mixing cavity 22, an air-distributing orifice plate 23, a water-cooling tube group 231 and a flame arrester 232. The mixing cavity 22 is welded with steel plates to form a cavity with two open ends and a closed periphery. One side is connected to the mixer 21, and the other side is connected to the water-cooling tube group 231. An air-distributing orifice plate 23 is arranged inside the mixing cavity 22 near the water-cooling tube group 231. The air-distributing orifice plate 23 is made of a thin steel plate, and a plurality of small holes are evenly opened on the steel plate for uniform air distribution. The water-cooling tube group 231 is composed of a plurality of straight tubes with square outer edges and round inner edges, arranged in a straight line, with two adjacent A certain gap is left between the tubes as a circulation and combustion channel for the premixed gas. The outer square inner round tube structure is specifically a square tube on the outer side and a round tube on the inner side. The round tube is arranged in the square tube, wherein the length of the round tube is greater than the length of the square tube. The round tube extends out of a tubular protrusion at the outer sides of both ends of the square tube. The outer side is set as a square tube to make the connection of the water-cooling tube group 231 on the steel plate more stable; a flame arrester 232 is arranged inside the gap of the water-cooling tube group 231 as a premixed gas injection and backfire prevention device. The flame arrester 232 is composed of multiple corrugated steel thin plates stacked together, and the air intake device 2 is arranged vertically on one side of the boiler body.

[0065] The boiler body adopts a vertical structure and is divided into three parts: upper, middle and lower. The upper part is formed by welding the side wall of the first furnace body 11 and the upper partition 111 to form a relatively closed cavity. The cavity is equipped with underwater orifice plates, air-equalizing orifice plates 119 and other devices. The side wall of the first furnace body 11 is equipped with water supply, air release, safety valve, liquid level, main steam and other pipe seats and upper inspection manhole 115 and other accessories. In order to strengthen the stability of the upper structure, reinforcing ribs are provided in the corresponding areas of the side wall of the first furnace body 11 and the upper partition 111. The reinforcing ribs can be made of steel plates or round steel structures.

[0066] The lower part is formed by welding the side wall of the second furnace body 12 and the lower partition 121 to form a relatively closed cavity. A sewage discharge device is provided inside the cavity. The side wall of the second furnace body 12 is provided with a lower inspection manhole 125, a sewage pipe seat and other accessories. In order to strengthen the stability of the lower structure, reinforcing ribs are provided in the corresponding areas of the side wall of the second furnace body 12 and the lower partition 121. The reinforcing ribs can be made of steel plates or round steel structures. A straight water pipe group is provided between the upper partition 111 and the lower partition 121. The straight water pipe group connects the upper cavity and the lower cavity. The straight water pipe group includes a water-cooling pipe group, a membrane wall tube, a small-diameter smooth pipe, a spiral fin tube, a large-diameter smooth pipe, etc., and its arrangement is as follows:

[0067] 1. The membrane wall tube is composed of a tube and a steel plate. The steel plate is located between two adjacent straight round tubes and the two adjacent tubes are connected by welding to form a closed wall. The membrane wall tube is arranged on the outermost circle of the boiler body to isolate the flame and high-temperature flue gas inside the boiler body.

[0068] 2. One side of the membrane wall tube is connected to the water-cooled tube group as the premixed gas inlet and combustion area, and the other side is used as the flue gas outlet.

[0069] 3. Along the direction of flue gas flow, a group of small-diameter smooth tubes, a group of spiral-finned tubes and a group of large-diameter smooth tubes are arranged in sequence.

[0070] The boiler body of the present invention adopts a vertical straight water pipe group structure and a natural circulation mode, and comprises a first furnace body 11, a water pipe group 13, and a second furnace body 12. It eliminates the cumbersome structures such as the traditional header and connecting pipes, and has a simple and compact structure with low steel consumption.

[0071] The boiler body eliminates the bulky furnace and traditional heat exchange surface, resulting in a compact overall structure, small footprint, and low metal steel consumption;

[0072] Independent reinforcing ribs are provided inside the first furnace body 11 and the second furnace body 12 of the boiler body to enhance the structural stability of the cylinder body itself. No additional outer cylinder body is required to reinforce the first furnace body 11 and the second furnace body 12, further reducing boiler steel consumption.

[0073] The boiler body eliminates the traditional downcomer structure, and a large-diameter smooth tube with sufficient cross-sectional area is set in the low-temperature area at the end of the boiler body. The water pipe group 13 near the air inlet device 2, namely the first water pipe group 131, is in the working state of the boiler because the temperature of the first water pipe group 131 is higher and the water in the first water pipe group 131 reaches the boiling temperature. The water flow in the first water pipe group 131 is in an upward state. The water pipe group 13 far away from the air inlet device 2, namely the second water pipe group 132, is farther away from the air inlet device 2. After being water-cooled by the first water tube group 131, the temperature of the second water tube group 132 is relatively low, and the water in the second water tube group 132 cannot reach the boiling point. The water flow in the second water tube group 132 is in a descending state. The rising water flow in the first water tube group 131, the descending water flow in the second water tube group 132, and the water in the first furnace body 11 and the water in the second furnace body 12 can achieve a natural circulation effect of boiler water circulation by relying on the difference in heat exchange intensity, thereby ensuring safe operation of the boiler while improving boiler space utilization.

[0074] The medium and low temperature flue gas section of the boiler adopts a spiral fin tube structure for heat exchange. The boiler has a compact structure, low steel consumption, and is simple and convenient.

[0075] The order of the above embodiments is only for the convenience of description and does not represent the superiority or inferiority of the embodiments.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A vertical water tube boiler suitable for a water-cooled premixed flat burner, comprising a boiler body, characterized in that: The boiler furnace is provided with a first furnace body, a second furnace body, and a water pipe group, the bottom of the first furnace body is provided with an upper partition, and the top of the second furnace body is provided with a lower partition; An isolation zone is provided on the outside of the water tube group, the top ends of the water tube group are connected to the first furnace body through the upper partition, and the bottom ends of the water tube group are connected to the second furnace body through the lower partition; an air intake device is provided on one side of the water tube group, and the air intake device is used to pass the intake gas to the water tube group; Wherein, the isolation zone is used for heat insulation, and the isolation zone adopts a fire-resistant partition or a membrane wall; A plurality of parallel steel plates are connected between the first furnace body and the second furnace body, wherein the top ends of the plurality of steel plates are fixedly connected to the first furnace body, and the bottom ends of the plurality of steel plates are fixedly connected to the second furnace body; A plurality of first reinforcing ribs are provided in the first furnace body, the first reinforcing ribs include a first transverse region and a first vertical region, the first transverse region is fixedly connected to the top surface of the upper partition, the first vertical region is fixedly connected to the inner side wall of the first furnace body, and the first transverse region and the first vertical region are integrally formed; A plurality of second reinforcing ribs are provided in the second furnace body, the second reinforcing ribs include a second transverse region and a second vertical region, the second transverse region is fixedly connected to the bottom surface of the lower partition, and the second vertical region is fixedly connected to the inner side wall of the second furnace body; Independent reinforcing ribs are respectively arranged inside the first furnace body and the second furnace body of the boiler body to strengthen the structural stability of the cylinder body itself, and there is no need to reinforce the first furnace body and the second furnace body by adding an additional outer cylinder body.

2. The vertical water tube boiler suitable for water-cooled premixed flat burners according to claim 1, characterized in that: The first reinforcing ribs, the second reinforcing ribs and the steel plate are arranged correspondingly, and the cross-section of the steel plate, the area of ​​the first transverse region and the area of ​​the second transverse region are the same in size.

3. The vertical water tube boiler suitable for water-cooled premixed flat burners according to claim 1, characterized in that: The air intake device includes a mixer, a mixing cavity, and an air-distributing orifice plate. The mixer is used to premix air and fuel gas and then pass them into the mixing cavity. The mixing cavity mixes the introduced gases and then passes them through the air-distributing orifice plate to the water-cooling pipe group after evenly distributing the gases. The mixer is provided with a first air intake valve and a second air intake valve, wherein the first air intake valve is used to control the air to flow into the mixer, and the second air intake valve is used to control the gas to flow into the mixer; A water cooling tube group and a flame arrester are arranged on the side of the uniform air hole plate away from the mixing cavity. The water cooling tube group is composed of a plurality of water cooling tubes arranged in parallel, and a flame arrester is arranged between two adjacent water cooling tubes.

4. The vertical water tube boiler suitable for water-cooled premixed plane burners according to claim 3, characterized in that: The flame arrester comprises a plurality of metal corrugated plates, which are stacked in an interlaced manner, and the corrugations between adjacent metal corrugated plates form a plurality of independent small cavity channels. The flame arrester connects the mixing cavity with the furnace through the small cavity channels between the corrugated plates.

5. The vertical water tube boiler suitable for water-cooled premixed flat burners according to claim 1, characterized in that: The water tube group includes a first water tube group and a second water tube group. The first water tube group is arranged near the air intake device, and the second water tube group is arranged on a side of the first water tube group away from the air intake device.

6. The vertical water tube boiler suitable for water-cooled premixed flat burners according to claim 1, characterized in that: A steam exhaust port is provided at the top of the first furnace body, a water inlet pipe is provided at one side of the lower part of the side of the first furnace body, and the water inlet pipe is connected to the first furnace body by penetrating the side wall of the first furnace body. The first furnace body is also provided with an upper inspection manhole, a safety valve, a liquid level gauge pipe seat, and a vent pipe; A sewage outlet and a sewage drainer are arranged at the bottom end of the second furnace body. The sewage outlet passes through the furnace wall of the second furnace body and is connected with the sewage drainer. A lower inspection manhole is also arranged on the second furnace body.

7. The vertical water tube boiler suitable for water-cooled premixed plane burners according to claim 6, characterized in that: The first furnace body is also provided with an air distribution hole plate, which is axially fixedly connected to the inner wall of the first furnace body, and the steam exhaust port, the safety valve and the vent pipe are arranged above the air distribution hole plate.

8. The vertical water tube boiler suitable for water-cooled premixed plane burners according to claim 5, characterized in that: The first water tube group includes a plurality of small diameter light tubes that are vertically connected and arranged in parallel, and the second water tube group includes a plurality of spiral fin tube groups or large diameter light tube groups or a spiral fin tube group and a large diameter light tube group that are vertically connected and arranged in parallel.

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