Multi-return-stroke membrane wall structure boiler

Abstract

The utility model provides a multi-return-stroke membrane wall structure boiler which comprises a hearth, a burnout chamber and a separation chamber, the hearth, the burnout chamber and the separation chamber are arranged in a boiler cavity side by side, a first partition is arranged between the hearth and the burnout chamber, the hearth is communicated with the top of the burnout chamber, a second partition is arranged between the burnout chamber and the separation chamber, and the second partition is communicated with the top of the burnout chamber. The burnout chamber is communicated with the bottom of the separation chamber, a smoke outlet is formed in the top of the side, opposite to the burnout chamber, of the separation chamber, ash buckets are fixedly arranged at the bottoms of the burnout chamber and the separation chamber, and double-layer flap valves are fixedly arranged at the bottoms of the ash buckets. The boiler cavity is divided into the hearth, the burnout chamber and the separation chamber through the first partition and the second partition, the arrangement is carried out aiming at the communication positions between the hearth and the burnout chamber and between the burnout chamber and the separation chamber, and through the arrangement of the multi-return-stroke flue, the rising trend of high-temperature flue gas can be met, and meanwhile the combustion efficiency is improved. The collection characteristic that the cigarette ash can sink due to self weight is considered, and cigarette ash and smoke are separated and collected.

Description

Technical Field

[0001] The utility model relates to the technical field of boilers, in particular to a multi-return membrane wall structure boiler. Background Art

[0002] The use of existing biomass boilers is generally divided into: feeding system, induced draft system, boiler combustion system and dust removal system due to the characteristics of biomass fuel being uniform in thickness, easy to ignite, fast in burning time and light in dust after burning. Since the various systems have clear division of labor and the equipment of each system is relatively independent, the existing biomass boilers inevitably have the disadvantages of large equipment footprint, troublesome installation, long and multi-path equipment for heat energy circulation, and waste of heat energy utilization. The flue gas multi-return circulation technology has been developed to a certain extent in recent years, but it is a reciprocating circulation in one drum. When the economizer technology is used at the same time, it is only a circulation in two-stage drums, and the efficiency improvement achieved is extremely limited; the increase in flue gas circulation resistance is solved by increasing forced ventilation. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the defects of the prior art. The utility model proposes a multi-return membrane wall structure boiler. Under the premise of not increasing forced ventilation, the inherent characteristics of high-temperature flue gas are used to complete the circulation and separation of flue gas in the boiler cavity and collect the ash.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a multi-return membrane wall structure boiler, characterized in that it includes a furnace, a burnout chamber and a separation chamber, the furnace, the burnout chamber and the separation chamber are arranged side by side in the boiler cavity, a first partition is arranged between the furnace and the burnout chamber, the furnace is connected to the top of the burnout chamber, a second partition is arranged between the burnout chamber and the separation chamber, the burnout chamber is connected to the bottom of the separation chamber, a flue gas outlet is opened at the top of the separation chamber facing away from the burnout chamber, an ash hopper is fixedly arranged at the bottom of the burnout chamber and the separation chamber, and a double-layer flap valve is fixedly arranged at the bottom of the ash hopper.

[0005] Furthermore, the upper edges of the first partition and the second partition are connected to the upper header, and the lower edges of the first partition and the second partition are connected to the lower header, and the first partition and the second partition are composed of tube panels.

[0006] Furthermore, a plurality of flag-type heating surfaces are provided in the separation chamber, and an inspection port and a plurality of soot blowing ports are provided on the upper side or the lower side of the flag-type heating surfaces.

[0007] Furthermore, at least one pressure measuring port and a temperature measuring port are provided on the left and right sides of the furnace and the burnout chamber.

[0008] Furthermore, an explosion-proof opening is provided on one side of the furnace.

[0009] Furthermore, the upper edge of the ash hopper is fixed on the first partition and the second partition respectively.

[0010] Furthermore, a pipe body and a steam drum are fixedly arranged on the periphery of the furnace, the burnout chamber and the separation chamber, the pipe body is connected with the steam drum, and the upper header and the lower header are connected with the pipe body.

[0011] Compared with the prior art, the beneficial effects of the utility model include: dividing the boiler cavity into a furnace, a burnout chamber and a separation chamber by a first partition and a second partition, and setting the connecting positions between the furnace and the burnout chamber, and between the burnout chamber and the separation chamber; through the multi-return flue setting, it can meet the rising trend of high-temperature flue gas while taking into account the collection characteristics of the ash that will sink due to its own weight, and the separation and collection of the ash and flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The disclosure of the present invention is described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the accompanying drawings, the same reference numerals are used to refer to the same components. Among them:

[0013] Figure 1 The schematic diagram shows the side view structure of a multi-pass membrane wall structure boiler, and the arrows in the figure schematically show the flow direction of the flue gas;

[0014] Figure 2 The top cross-sectional structure of a multi-pass membrane wall structure boiler is schematically shown.

[0015] Numbers in the figure: 1-furnace, 2-combustion chamber, 3-separation chamber, 4-first partition, 5-second partition, 6-ash hopper, 7-double-layer flap valve, 8-upper header, 9-lower header, 10-tube screen, 11-flag-type heating surface, 12-tube body, 13-steam drum. DETAILED DESCRIPTION

[0016] It is easy to understand that according to the technical solution of the utility model, without changing the essential spirit of the utility model, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the utility model, and should not be regarded as the entirety of the utility model or as a limitation or restriction to the technical solution of the utility model.

[0017] Figure 1 The schematic diagram shows the side view of the multi-pass membrane wall boiler. Figure 2 The schematic diagram shows the top cross-sectional structure of a multi-pass membrane wall boiler. Figure 1 and Figure 2 As shown, a multi-pass membrane wall structure boiler includes a furnace 1, a burnout chamber 2 and a separation chamber 3. The furnace 1, the burnout chamber 2 and the separation chamber 3 are arranged side by side in the boiler cavity. A first partition 4 is arranged between the furnace 1 and the burnout chamber 2. The furnace 1 is connected to the top of the burnout chamber 2. A second partition 5 is arranged between the burnout chamber 2 and the separation chamber 3. The burnout chamber 2 is connected to the bottom of the separation chamber 3. Through the partitions and the connection positions of the furnace 1, the burnout chamber 2 and the separation chamber 3, the connection area between the furnace 1 and the burnout chamber 2 is arranged at the top, which can better adapt to the rising process of the high-temperature flue gas. After being blocked by the top of the boiler cavity, the high-temperature flue gas is transferred from the connection area between the furnace 1 and the burnout chamber 2 to the burnout chamber 2. An ash hopper 6 is fixedly installed at the bottom of the burnout chamber 2 and the separation chamber 3, and a double-layer flap valve 7 is fixedly installed at the bottom of the ash hopper 6. The upper edges of the aforementioned ash hopper 6 are respectively fixed on the first partition 4 and the second partition 5. After the aforementioned flue gas is transferred to the burnout chamber 2, the heavier ash part in the flue gas can fall into the aforementioned ash hopper 6 and be collected by the ash hopper 6, while the lighter gas part in the flue gas can be further transferred to the separation chamber 3 through the connecting area at the bottom of the burnout chamber 2 and the separation chamber 3. After that, since the flue gas is also in a high temperature state at this time, it can rise in the separation chamber 3, so as to be discharged through the flue gas outlet or undergo subsequent processing procedures.

[0018] like Figure 1 As shown, the aforementioned double-layer flap valve 7 is arranged at the outlet of the ash hopper 6. Compared with the conventional plug-in valve, the flap valve can determine the opening and closing of the valve plate with the help of the deadweight of the soot accumulated on the valve plate, and complete the ash cleaning process by relying on the deadweight of the ashes. In addition, the setting of the flap valve can effectively prevent the escape of high-temperature flue gas, and the sealing performance is better. The setting of the double-layer flap valve 7 can further improve the sealing performance.

[0019] The boiler cavity is divided into a furnace 1, a burnout chamber 2 and a separation chamber 3 by a first partition 4 and a second partition 5, and the connecting positions between the furnace 1 and the burnout chamber 2, and between the burnout chamber 2 and the separation chamber 3 are set. Through the multi-return flue setting, it can meet the rising trend of high-temperature flue gas while taking into account the collection characteristics of the ash that will sink due to its own weight, and the separation and collection of the ash and flue gas.

[0020] The upper edges of the first partition 4 and the second partition 5 are connected to the upper header 8, and the lower edges of the first partition 4 and the second partition 5 are connected to the lower header 9. The first partition 4 and the second partition 5 are water-cooled walls composed of tube panels 10. A tube body 12 and a steam drum 13 are fixedly arranged on the periphery of the furnace 1, the burnout chamber 2 and the separation chamber 3. The tube body 12 is connected to the steam drum 13, and the upper header 8 and the lower header 9 are connected to the tube body 12. By using the heat generated during the combustion of fuel through the tube body 12 and the steam drum 13, liquid such as water is passed into the tube body 12 to obtain high-temperature steam.

[0021] Based on the fact that a plurality of flag-type heating surfaces 11 are arranged in the aforementioned separation chamber 3, and an inspection port and a plurality of soot blowing ports are provided on the upper side or the lower side of the flag-type heating surface 11, part of the soot remains on the side wall of the separation chamber 3 during the discharge of the high-temperature flue gas from the flue gas outlet, and the soot adhering to the side wall can be removed through the soot blowing ports and collected in the ash hopper 6. No convection heating surface is separately arranged in the furnace 1 and the burnout chamber 2 to prevent the coking problem of the high-temperature molten ash, thereby affecting the heat exchange effect.

[0022] At least one pressure measuring port and one temperature measuring port are provided on the left and right sides of the aforementioned furnace 1 and burnout chamber 2, through which the temperature and pressure in the furnace 1 and the burnout chamber 2 can be monitored, and an explosion-proof port is provided on one side of the furnace 1, through which the extended temperature of the burnout chamber outlet is designed according to the coking temperature characteristics of ash after high-temperature combustion of different biomass, thereby ensuring safe and stable operation of the boiler.

[0023] The technical scope of the present invention is not limited to the contents described above. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical concept of the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. A multi-pass membrane wall structure boiler, characterized in that: The invention comprises a furnace (1), a burnout chamber (2) and a separation chamber (3), wherein the furnace (1), the burnout chamber (2) and the separation chamber (3) are arranged side by side in a boiler cavity, a first partition (4) is arranged between the furnace (1) and the burnout chamber (2), the tops of the furnace (1) and the burnout chamber (2) are connected, a second partition (5) is arranged between the burnout chamber (2) and the separation chamber (3), the bottoms of the burnout chamber (2) and the separation chamber (3) are connected, a smoke outlet is opened at the top of the separation chamber (3) on the side opposite to the burnout chamber (2), an ash hopper (6) is fixedly arranged at the bottoms of the burnout chamber (2) and the separation chamber (3), and a double-layer flap valve (7) is fixedly arranged at the bottom of the ash hopper (6).

2. The multi-pass membrane wall structure boiler according to claim 1, characterized in that: The upper edges of the first partition (4) and the second partition (5) are connected to the upper header (8), while the lower edges of the first partition (4) and the second partition (5) are connected to the lower header (9). The first partition (4) and the second partition (5) are composed of a tube panel (10).

3. The multi-pass membrane wall structure boiler according to claim 1, characterized in that: A plurality of flag-type heating surfaces (11) are also arranged in the separation chamber (3), and an inspection port and a plurality of soot blowing ports are opened on the upper side or the lower side of the flag-type heating surfaces (11).

4. The multi-pass membrane wall structure boiler according to claim 1, characterized in that: At least one pressure measuring port and a temperature measuring port are provided on the left and right sides of the furnace (1) and the burnout chamber (2).

5. The multi-pass membrane wall structure boiler according to claim 4, characterized in that: An explosion-proof opening is also provided on one side of the furnace (1).

6. The multi-pass membrane wall structure boiler according to claim 1, characterized in that: The upper edge of the ash hopper (6) is fixed on the first partition (4) and the second partition (5) respectively.

7. The multi-pass membrane wall structure boiler according to claim 2, characterized in that: A pipe body (12) and a steam drum (13) are fixedly arranged on the periphery of the furnace (1), the burnout chamber (2) and the separation chamber (3); the pipe body (12) is connected to the steam drum (13), and the upper header (8) and the lower header (9) are connected to the pipe body (12).

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