Biomass steam boiler

Abstract

The utility model discloses a biomass steam boiler, and relates to the technical field of biomass steam boilers. The boiler comprises a water drum arranged on the upper portion and a combustion chamber arranged on the lower portion. A biomass combustion grate for horizontal feeding is arranged in the combustion chamber, an inclined arch plate is arranged in the combustion chamber and located above the biomass combustion grate, the arch plate comprises a front arch located above the feeding end of the biomass combustion grate and a rear arch located above the discharging end of the biomass combustion grate, the front arch inclines upwards, and the rear arch inclines downwards. A smoke passing channel communicating the upper space and the lower space of the arch plate is arranged at the joint of the front arch and the rear arch, the top end of the front arch is located above the arch top end of the rear arch, the side wall, located at the lower end of the rear arch, of the combustion chamber is communicated with an air inlet channel, and the air inlet channel is communicated with a cavity above the rear arch. The purpose that combustion smoke can be fully combined with external air, and therefore a large amount of high-temperature smoke is conveyed into the smoke pipe to heat water in the water bag is achieved.

Description

Technical Field

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

[0002] Biomass boiler is a type of boiler. The 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] At present, for the biomass boiler in the bedroom, how to make the generated flue gas mix well with the external airflow, so that the external airflow can transport a large amount of high-temperature flue gas into the flue pipe, thereby efficiently heating the water in the water bag, is one of the key technologies to improve the biomass steam boiler. Utility Model Content

[0004] The utility model aims to provide a biomass steam boiler to achieve the purpose of fully combining combustion flue gas with external air, thereby transporting a large amount of high-temperature flue gas to the flue gas pipe to heat the water in the water bag.

[0005] In order to achieve the above purpose, the utility model adopts the following technical means:

[0006] A biomass steam boiler comprises a water bag arranged at the top and a combustion chamber arranged at the bottom;

[0007] The combustion chamber is provided with a biomass combustion grate for horizontal feeding, and an inclined arch plate is provided above the biomass combustion grate in the combustion chamber, and the arch plate comprises a front arch located above the feeding end of the biomass combustion grate and a rear arch located above the discharging end of the biomass combustion furnace, along the material moving direction of the biomass combustion grate, the front arch is inclined upward, and the rear arch is inclined downward, and a smoke passage connecting the upper and lower spaces of the arch plate is provided at the junction of the front arch and the rear arch, the top end of the front arch is located above the top end of the rear arch, and a side wall of the combustion chamber is located on one side of the lower end of the rear arch and is connected to an air inlet channel, and the air inlet channel is connected to the upper cavity of the rear arch;

[0008] A horizontal smoke pipe is provided in the water bag, and a smoke collecting box connected to the smoke pipe is provided at the end of the water bag opposite to the air inlet channel. The smoke collecting box is connected to the cavity of the combustion chamber located above the arch plate, and the connecting port between the smoke collecting box and the combustion chamber is provided on the side opposite to the air inlet channel.

[0009] Preferably, the smoke pipe is composed of a plurality of pipes which are parallel to each other and arranged horizontally, and each of the pipes is connected to the smoke collecting box.

[0010] Furthermore, the gas outlet end of the flue gas pipe is connected to the exhaust gas treatment equipment.

[0011] Furthermore, the side walls of the water bag are respectively connected with a gas pipe, a gas-liquid mixing pipe and a liquid pipe. The gas pipe is connected to the bottom surface of the water bag and gradually connected to the gas-liquid mixing pipe and the liquid pipe upwards in sequence.

[0012] Furthermore, the gas pipe is entirely arranged in the combustion chamber and is arranged close to the front arch or the rear arch, and the gas pipe is a serpentine pipe;

[0013] The gas-liquid mixing tube comprises a first heating section which is in contact with the inner wall of the combustion chamber and a gasification section which is arranged obliquely in the combustion chamber and away from the inner wall of the combustion chamber. The gas-liquid mixing tube is a single-bend tube.

[0014] The liquid pipe is arranged to fit the inner wall of the combustion chamber as a whole.

[0015] Furthermore, the gas pipe, the gas-liquid mixing pipe and the liquid inlet end of the liquid pipe all extend out of the combustion chamber and are connected to the same water supply pipe.

[0016] During use, the utility model has the following beneficial effects:

[0017] The biomass fuel falls on the feeding end of the biomass combustion grate. With the operation of the biomass combustion grate, the biomass fuel is preheated, distilled, ignited, and burned. The slag falls into the discharge end of the biomass combustion grate and is discharged. The high-temperature flue gas generated by the biomass combustion enters the upper cavity of the combustion chamber arch plate in the smoke passage between the front arch and the rear arch, which can form a vortex and fully mix with the air flowing in from the air inlet channel, and heat the front arch while improving the ignition conditions. Then, the high-temperature flue gas is fully mixed with the air and sent into the smoke collecting box in large quantities, flows through the flue pipe, and heats the water in the water bag. Thus, the structural setting of the front arch and the rear arch is used to make the high-temperature flue gas generate a vortex, so that it can be efficiently mixed with the air blown in from the outside, avoiding the problem of low boiler heating efficiency caused by the heat generated by the high-temperature flue gas not being able to pass through the flue pipe in large quantities. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view cross-sectional structural schematic diagram of the utility model.

[0019] Figure 2 This is a schematic diagram of the test half-section structure of the utility model.

[0020] Among them, 1-water bag, 2-combustion chamber, 3-biomass combustion grate, 4-front arch, 5-rear arch, 6-smoke passage, 7-air inlet channel, 8-smoke pipe, 9-smoke collecting box, 10-gas pipe, 11-gas-liquid mixing pipe, 12-liquid pipe. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features thereof may be combined with each other.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0025] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Please refer to Figure 1 and Figure 2 As shown, a biomass steam boiler comprises a water bag 1 arranged at the top and a combustion chamber 2 arranged at the bottom;

[0028] A biomass combustion grate 3 for horizontal feeding is provided in the combustion chamber 2, and an inclined arch plate is provided above the biomass combustion grate 3 in the combustion chamber 2, and the arch plate includes a front arch 4 located above the feeding end of the biomass combustion grate 3 and a rear arch 5 located above the discharging end of the biomass combustion grate 3. Along the material moving direction of the biomass combustion grate 3, the front arch 4 is inclined upward, and the rear arch 5 is inclined downward. A smoke passage 6 for connecting the upper and lower spaces of the arch plate is provided at the junction of the front arch 4 and the rear arch 5. The top end of the front arch 4 is located above the top end of the rear arch 5. The side wall of the combustion chamber 2 is located on one side of the lower end of the rear arch 5 and is connected to an air inlet channel 7, and the air inlet channel 7 is connected to the upper cavity of the rear arch 5.

[0029] A horizontal smoke pipe 8 is provided in the water bag 1, and a smoke collecting box 9 connected to the smoke pipe 8 is provided at the end of the water bag 1 opposite to the air inlet channel 7. The smoke collecting box 9 is connected to the cavity of the combustion chamber 2 located above the arch plate, and the connecting port between the smoke collecting box 9 and the combustion chamber 2 is arranged on the side opposite to the air inlet channel 7.

[0030] In this way, the biomass fuel falls on the feeding end of the biomass combustion grate 3. With the operation of the biomass combustion grate 3, the biomass fuel is preheated, distilled, ignited, and burned. The slag falls into the discharge end of the biomass combustion grate 3 and is discharged. The high-temperature flue gas generated by the biomass combustion enters the upper cavity of the arch plate of the combustion chamber 2 in the smoke passage 6 between the front arch 4 and the rear arch 5, and can form a vortex to fully mix with the air flowing in from the air inlet channel 7, and heat the front arch 4 while improving the ignition conditions. Then, the high-temperature flue gas is fully mixed with the air and sent to the smoke collecting box 9 in large quantities, flows through the flue pipe 8, and heats the water in the water bag 1. Thus, the structural setting of the front arch 4 and the rear arch 5 is used to make the high-temperature flue gas generate a vortex, so that it can be efficiently mixed with the air blown in from the outside, avoiding the problem that the heat generated by the high-temperature flue gas cannot pass through the flue pipe 8 in large quantities, resulting in low boiler heating efficiency.

[0031] Furthermore, the smoke pipe 8 is composed of a plurality of pipes which are parallel to each other and arranged horizontally, and each of the pipes is connected to the smoke collecting box 9 .

[0032] Furthermore, the gas outlet end of the flue gas pipe 8 is connected to the tail gas treatment equipment.

[0033] Furthermore, the side walls of the water bag 1 are respectively connected with a gas pipe 10, a gas-liquid mixing pipe 11 and a liquid pipe 12. The gas pipe 10 is connected to the bottom surface of the water bag 1 and gradually connected to the gas-liquid mixing pipe 11 and the liquid pipe 12 upwards.

[0034] Therefore, by directly blowing high-temperature steam into the water bag 1 through the gas pipe 10, the sludge at the bottom of the water bag 1 can be turned over to avoid a large amount of sludge sinking to the bottom.

[0035] Furthermore, the gas pipe 10 is disposed in its entirety in the combustion chamber 2 and is disposed close to the front arch 4 or the rear arch 5, and the gas pipe 10 is a serpentine pipe;

[0036] The gas-liquid mixing tube 11 includes a first heating section that is in contact with the inner wall of the combustion chamber 2 and a gasification section that is obliquely disposed in the combustion chamber 2 and away from the inner wall of the combustion chamber 2. The gas-liquid mixing tube 11 is a single-bend tube.

[0037] The liquid pipe 12 is disposed in its entirety in contact with the inner wall of the combustion chamber 2 .

[0038] Furthermore, the liquid inlet ends of the gas pipe 10 , the gas-liquid mixing pipe 11 and the liquid pipe 12 all extend out of the combustion chamber 2 and are connected to the same water supply pipe.

[0039] In this way, the high-temperature steam formed in the gas pipe 10 is due to the fact that a large area of ​​the gas pipe 10 is exposed in the combustion chamber 2. The heating area is increased through the serpentine pipe, and the heat received is increased by bringing the gas pipe 10 close to the arch plate. In this way, the liquid blown into the water bag 1 from the water supply pipe through the gas pipe 10 can directly form high-temperature steam in the gas pipe 10, thereby improving the output efficiency of the entire steam boiler and utilizing the blown-in high temperature to disturb the liquid in the water bag 1 to avoid the deposition of debris.

[0040] For the gas-liquid mixing tube 11, it enters the first heating section from the water supply pipe for preheating. When the preheated liquid passes through the gasification section, part of the liquid will be heated to high-temperature steam to form a gas-liquid mixed material, which is then blown into the water bag 1. This part of the gas-liquid mixed material also plays the role of replenishing water in the water bag 1 and increasing steam output and liquid disturbance.

[0041] In addition, the liquid pipe 12 is entirely attached to the inner wall of the combustion chamber 2 and away from the arch plate, so that the liquid pipe 12 is always filled with liquid materials. The liquid pipe 12 plays the role of replenishing water into the water bag 1. At the same time, the liquid in the liquid pipe 12 can also be heated by the temperature in the combustion chamber 2, thereby avoiding low-temperature water from being directly added to the water bag 1.

[0042] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A biomass steam boiler, characterized in that: It comprises a water bag (1) arranged at the top and a combustion chamber (2) arranged at the bottom; The combustion chamber (2) is provided with a biomass combustion grate (3) for horizontal feeding, and an inclined arch plate is provided above the biomass combustion grate (3) in the combustion chamber (2). The arch plate comprises a front arch (4) located above the feeding end of the biomass combustion grate (3) and a rear arch (5) located above the discharging end of the biomass combustion grate (3). Along the material moving direction of the biomass combustion grate (3), the front arch (4) is inclined upward, and the rear arch (5) is inclined downward. A smoke passage (6) is provided at the junction of the front arch (4) and the rear arch (5) for connecting the upper and lower spaces of the arch plate. The top end of the front arch (4) is located above the top end of the rear arch (5). The side wall of the combustion chamber (2) is located on one side of the lower end of the rear arch (5) and is connected to an air inlet channel (7). The air inlet channel (7) is connected to the upper cavity of the rear arch (5). A horizontal smoke pipe (8) is arranged in the water bag (1); a smoke collecting box (9) connected to the smoke pipe (8) is arranged at the end of the water bag (1) opposite to the air inlet channel (7); the smoke collecting box (9) is connected to the cavity of the combustion chamber (2) located above the arch plate; and a connecting port between the smoke collecting box (9) and the combustion chamber (2) is arranged on a side opposite to the air inlet channel (7).

2. A biomass steam boiler according to claim 1, characterized in that: The smoke pipe (8) is composed of a plurality of pipes which are parallel to each other and arranged horizontally, and each of the pipes is connected to the smoke collecting box (9).

3. A biomass steam boiler according to claim 1 or 2, characterized in that: The gas outlet end of the flue gas pipe (8) is connected to the tail gas treatment equipment.

4. The biomass steam boiler according to claim 1, characterized in that: The side walls of the water bag (1) are respectively connected to a gas pipe (10), a gas-liquid mixing pipe (11) and a liquid pipe (12); the gas pipe (10) is connected to the bottom surface of the water bag (1) and is gradually connected upwards to the gas-liquid mixing pipe (11) and the liquid pipe (12).

5. A biomass steam boiler according to claim 4, characterized in that: The gas pipe (10) is entirely disposed in the combustion chamber (2) and is arranged close to the front arch (4) or the rear arch (5); the gas pipe (10) is a serpentine pipe; The gas-liquid mixing tube (11) comprises a first heating section which is in contact with the inner wall of the combustion chamber (2) and a gasification section which is arranged obliquely in the combustion chamber (2) and away from the inner wall of the combustion chamber (2); the gas-liquid mixing tube (11) is a single-bend tube; The liquid pipe (12) is arranged to fit the inner wall of the combustion chamber (2) as a whole.

6. The biomass steam boiler according to claim 5, characterized in that: The liquid inlet ends of the gas pipe (10), the gas-liquid mixing pipe (11) and the liquid pipe (12) all extend out of the combustion chamber (2) and are connected to the same water supply pipe.

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