Biomass steam boiler

Abstract

A biomass steam boiler comprises a combustion chamber and a cylindrical body arranged above the combustion chamber, an upper cavity and a lower cavity are communicated through a plurality of heat exchange pipes, a water pressing strip with the width smaller than the inner diameter of each heat exchange pipe is fixed to the top in each heat exchange pipe, and semicircular water pressing pieces arranged up and down are arranged on the sides of the water pressing strips respectively. The semicircular water pressing piece is formed by stamping, cutting and bending a water pressing strip body, a notch structure corresponding to the water pressing piece in shape is formed in the cutting portion of the water pressing strip, a smoke exhaust pipe is arranged on one side of the top of the outer portion of the body, a steam outlet is formed in the top of the upper cavity, and a water adding opening is formed in one side of the lower cavity. The water pressing strip and the water pressing piece form a good water blocking structure, water in the heat exchange pipe, particularly heated boiling water, can be greatly reduced, water resources can be effectively utilized, heat discharged along with the water is reduced, and liquid water can be effectively prevented from entering external equipment to corrode the external equipment for a long time.

Description

Technical Field

[0001] This utility model relates to a steam boiler, specifically a biomass steam boiler. Background Technology

[0002] A steam boiler is a mechanical device that uses the thermal energy of fuel or other energy sources to heat water into steam. It primarily converts the chemical energy of the fuel into thermal energy, which is then transferred to the water in the boiler to heat it into steam. Steam boilers are widely used in various industries. Based on the fuel used, steam boilers can be classified into electromagnetic steam boilers, electric steam boilers, oil-fired steam boilers, and gas-fired steam boilers, among others.

[0003] However, the current design of the heat exchange tube structure of steam boilers is unreasonable. After the heat exchange tube is heated, the water inside the tube will boil. Some of the water will rise with the steam and be discharged at the steam outlet. This not only makes it difficult to ensure the purity of the steam, but also wastes some water resources. If the discharged water enters external equipment, it may cause corrosion and damage to the external equipment. Utility Model Content

[0004] In order to solve the above problems, the purpose of this utility model is to provide a biomass steam boiler.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: A biomass steam boiler includes a combustion chamber and a cylindrical body disposed above the combustion chamber. A burner is disposed on one side of the combustion chamber. A circular upper cavity is disposed at the upper end of the body, and an annular lower cavity is disposed at the lower end of the body. The upper cavity and the lower cavity are connected by multiple heat exchange tubes. The body is connected to the top of the combustion chamber through the central opening of the lower cavity. The top of the body is sealed through the bottom of the upper cavity. Multiple heat exchange tubes are arranged around the central axis of the body and form multiple rings. A water pressure strip with a width smaller than the inner diameter of the heat exchange tube is fixed at the top of each heat exchange tube. Semi-circular water pressure plates are disposed on each side of the water pressure strip. The semi-circular water pressure plates are formed by stamping, cutting, and bending the water pressure strip body, and the cut part of the water pressure strip forms a notch structure corresponding to the shape of the water pressure plate. A flue gas discharge pipe is disposed on one side of the top of the body. A steam outlet is disposed on the top of the upper cavity, and a water inlet is disposed on one side of the lower cavity.

[0006] Furthermore, hollow box-shaped space-eliminating components are fixed in the upper cavity and the lower cavity respectively.

[0007] Furthermore, the outer walls of the upper and lower chambers are connected via a level gauge mounting pipe.

[0008] Furthermore, the central opening of the lower chamber is a conical structure, and the larger opening at the bottom connects to the top of the combustion chamber.

[0009] Furthermore, a biomass feeding device is provided on one side of the main body. The biomass feeding device consists of a hopper and a screw conveyor connected to the bottom of the hopper. The discharge end of the screw conveyor is connected to the inside of the combustion chamber through a feed pipe.

[0010] Furthermore, a vertical cylindrical cavity structure runs through the center of the upper cavity. The upper end of the cylindrical cavity structure is sealed, and a water vapor connecting pipe runs horizontally through its interior. The front and rear ends of the water vapor connecting pipe connect the upper cavity to the front and rear, respectively.

[0011] When this invention is in operation, the flame emitted by the burner burns fully in the combustion chamber, and the high-temperature flue gas enters the center of the main body and rises along the center of the main body. The high-temperature flue gas rises and is finally discharged from the flue gas exhaust pipe. During this process, each heat exchange tube is heated. Since the upper and lower chambers are connected by multiple heat exchange tubes, a heat exchange structure is formed. Water enters from the lower chamber and can quickly heat the water in the upper chamber, lower chamber and heat exchange tubes, thereby forming steam. The steam and water rise and are subjected to the action of the water pressure bar. That is, each heat exchange tube has a water pressure bar fixed at the top with a width smaller than the inner diameter of the heat exchange tube. Each side of the water pressure bar is provided with a semi-circular water pressure plate arranged vertically, and the semi-circular water pressure plates on both sides are staggered. The semi-circular water pressure plates are formed by stamping, cutting and bending the water pressure bar body. The semi-circular water pressure plates on both sides of the water pressure bar form a water blocking effect, separating the steam and water. The dry steam continues to rise into the upper chamber and is finally discharged from the steam outlet.

[0012] The water-pressing strips and plates of this invention form a good water-blocking structure, which can greatly reduce the amount of water in the heat exchange tubes. In particular, the boiling water after heating rises with the steam, thus effectively preventing liquid water from being discharged to external equipment through the steam outlet. On the one hand, water resources can be utilized more effectively and heat can be reduced by being discharged with the water. On the other hand, it can effectively prevent liquid water from entering external equipment and causing long-term corrosion to the external equipment. The purity of the steam is higher, which is more conducive to the supply of steam. Attached Figure Description

[0013] The present invention will now be further described with reference to the accompanying drawings.

[0014] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0015] Figure 2 This is a side view of the water pressure strip of this utility model.

[0016] Figure 3 This is a schematic diagram of the main structure of the water pressure strip of this utility model;

[0017] Figure 4 This is a top view of the water pressure strip of this utility model. Detailed Implementation

[0018] like Figure 1-4 As shown, a biomass steam boiler includes a combustion chamber 1 and a cylindrical body 2 disposed above the combustion chamber 1, separating the combustion chamber 1 from the heating surface (i.e., the cylindrical body 2). A burner is disposed on one side of the combustion chamber 1. The upper end of the body 2 is provided with a circular upper cavity 3, and the lower end of the body 2 is provided with an annular lower cavity 4. The upper cavity 3 and the lower cavity 4 are connected by multiple heat exchange tubes 5. Each heat exchange tube 5 can also be provided with a vertical pressure bar to facilitate steam-water separation. The body 2 is connected to the top of the combustion chamber 1 through the central opening of the lower cavity 4. The top of the body 2 is sealed through the bottom of the upper cavity 3. The multiple heat exchange tubes 5 are arranged around the central axis of the body 2, and the heat exchange tubes 5 form multiple rings. The top of each heat exchange tube 5 is fixed with a width smaller than the heat exchange tube. The inner diameter of the heat pipe 5 has a water pressure strip 6. Each side of the water pressure strip 6 is provided with a semi-circular water pressure plate 7 arranged vertically. The semi-circular water pressure plates 7 on both sides are staggered. The semi-circular water pressure plates 7 are formed by stamping, cutting and bending the main body of the water pressure strip 6. The cut part of the water pressure strip 6 forms a notch structure 8 that corresponds to the shape of the water pressure plate 7. That is, the semi-circular water pressure plate 7 and the water pressure strip 6 are integrated and formed by stamping and bending. The water pressure plate 7 is perpendicular to the main body of the water pressure strip 6 and can form a certain tilt angle with the horizontal plane. A certain gap is formed between the outer periphery of each water pressure plate 7 and the inner wall of the heat exchange tube 5. A flue gas exhaust pipe 9 is provided on one side of the top of the main body 2. A steam outlet 10 is provided on the top of the upper cavity 3. A water inlet 11 is provided on one side of the lower cavity 4.

[0019] Hollow box-shaped space-eliminating components 12 are fixed in the upper cavity 3 and the lower cavity 4 respectively to fill the space of the upper and lower cavities, so that the water volume of the water storage parts of the upper and lower cavities of the main body 2 is not greater than 50L. The outer walls of the upper cavity 3 and the lower cavity 4 are connected by a liquid level gauge installation pipe 13. The central opening of the lower cavity 4 is a conical structure, and the larger opening at the bottom is connected to the top of the combustion chamber 1. A vertical cylindrical cavity structure 14 runs through the center of the upper cavity 3. The upper end of the cylindrical cavity structure 14 is sealed, and a water-steam connecting pipe 15 runs horizontally through its interior. The front and rear ends of the water-steam connecting pipe 15 connect the upper cavity 3, and the water-steam connecting pipe 15 absorbs heat fully to reduce the steam water carryover rate.

[0020] In addition, to facilitate automatic feeding, similar to the screw-type automatic feeding of current food machinery, and easy to control via current PLC, a biomass feeding device 16 is provided on one side of the main body 2. It is similar to the screw feeding structure with a hopper. The biomass feeding device 16 consists of a hopper and a screw conveyor connected to the bottom of the hopper. The discharge end of the screw conveyor is connected to the inside of the combustion chamber 1 through the feed pipe 17. In this way, when the hopper is full of biomass fuel, the biomass fuel is delivered to the combustion chamber 1 in a timed and quantitative manner by the rotation of the screw conveyor. A spare port 18 is also provided on one side of the combustion chamber 1. Other fuels such as coal and wood can be added through the spare port 18. Of course, the combustion chamber 1 can also be connected to a natural gas burner to use natural gas as fuel. That is, when the biomass fuel supply is not timely, this spare port 18 can be connected to a natural gas burner.

[0021] Working principle of this utility model

[0022] The fuel fed by the screw conveyor through the feed pipe is fully burned in the combustion chamber. The high-temperature flue gas enters the center of the main body and rises along the center. The high-temperature flue gas rises and is finally discharged from the flue gas discharge pipe 9. During this process, each heat exchange tube 5 is heated. Since the upper chamber 3 and the lower chamber 4 are connected by multiple heat exchange tubes 5, a heat exchange structure is formed. Water enters from the lower chamber 4 and can quickly heat the water in the upper chamber 3, the lower chamber 4 and the heat exchange tubes 5, thereby forming steam. The steam and water rise and are heated. Under the action of the water pressure bar 6, that is, each heat exchange tube 5 has a water pressure bar 6 with a width smaller than the inner diameter of the heat exchange tube 5 fixed at the top. Each side of the water pressure bar 6 is provided with a semi-circular water pressure plate 7 arranged vertically. The semi-circular water pressure plates 7 on both sides are staggered. The semi-circular water pressure plates 7 are formed by stamping, cutting and bending the main body of the water pressure bar 6. The semi-circular water pressure plates 7 on both sides of the water pressure bar 6 form a water blocking effect, separating the steam and water. The dry steam continues to rise into the upper chamber 3 and is finally discharged from the steam outlet 10.

[0023] The above description is merely an illustrative embodiment of this utility model and is not intended to limit the scope of this utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. A biomass steam boiler comprising a combustion chamber (1) and a cylindrical body (2) arranged above the combustion chamber (1), characterized in that: The upper end of the body (2) is provided with a circular upper cavity (3), the lower end of the body (2) is provided with an annular lower cavity (4), and the upper cavity (3) and the lower cavity (4) are communicated through a plurality of heat exchange pipes (5), the body (2) is communicated with the top of the combustion chamber (1) through the center opening of the lower cavity (4), the inner top of each heat exchange pipe (5) is fixed with a water pressing strip (6) with a width smaller than the inner diameter of the heat exchange pipe (5), each side of the water pressing strip (6) is provided with a semicircular water pressing piece (7) arranged in upper and lower directions, the outer top of the body (2) is provided with a flue gas discharge pipe (9) on one side, the top of the upper cavity (3) is provided with a steam outlet (10), and one side of the lower cavity (4) is provided with a water inlet (11).

2. A biomass steam boiler as claimed in claim 1, characterised in that: The top of the body (2) is sealed through the bottom of the upper cavity (3), the plurality of heat exchange pipes (5) are arranged around the central axis of the body (2), and the heat exchange pipes (5) are arranged in multiple circles.

3. A biomass steam boiler as claimed in claim 1, wherein: The combustion chamber (1) is provided with a combustion machine on one side, the semicircular water pressing piece (7) is formed by stamping, cutting and bending of the water pressing strip (6), and the cutting part of the water pressing strip (6) forms a notch structure (8) corresponding to the shape of the water pressing piece (7).

4. A biomass steam boiler as claimed in claim 1, wherein: The upper cavity (3) and the lower cavity (4) are respectively fixed with a hollow box-shaped space elimination element (12).

5. A biomass steam boiler as claimed in claim 1, wherein: The outer side walls of the upper cavity (3) and the lower cavity (4) are communicated through a liquid level meter installation pipe (13).

6. A biomass steam boiler as claimed in claim 1, wherein: The center opening of the lower cavity (4) is a conical structure, and the opening with a larger bottom is communicated with the top of the combustion chamber (1).

7. A biomass steam boiler as claimed in claim 1, wherein: The center of the upper cavity (3) is vertically penetrated by a cylindrical cavity structure (14), the upper end of the cylindrical cavity structure (14) is closed, and a water vapor connecting pipe (15) is horizontally penetrated in the cylindrical cavity structure (14), the front and rear ends of the water vapor connecting pipe (15) respectively communicate the front and rear of the upper cavity (3).

8. A biomass steam boiler as claimed in claim 1, wherein: One side of the body (2) is provided with a biomass feeding device (16), the biomass feeding device (16) is composed of a hopper and a screw conveyor communicated with the bottom of the hopper, and the discharge end of the screw conveyor is communicated with the inside of the combustion chamber (1) through a feeding pipe (17).

9. A biomass steam boiler as claimed in claim 1, wherein: The combustion chamber (1) is further provided with a standby port (18).

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