Double-working-medium biomass gasification boiler
By designing a dual-working-fluid biomass gasification boiler, and utilizing a combination of reciprocating grate and heat transfer oil pipes, the biomass gasification boiler can simultaneously produce steam and heat transfer oil, solving the problem of a single energy output form in existing technologies, reducing equipment costs and improving heat exchange efficiency.
Patent Information
- Application Number
- CN202512048436.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-31
- Publication Date
- 2026-02-06
AI Technical Summary
Existing biomass gasification boilers can only output high-temperature heat transfer oil or steam, which is insufficient to meet the heat energy needs of users under various operating conditions.
The design includes a dual-working-fluid biomass gasification boiler, comprising a reciprocating grate, a water supply pipe, a steam outlet pipe, and a heat transfer oil pipe. Biomass fuel is transported through the reciprocating grate to heat the water in the water supply pipe and the heat transfer oil in the heat transfer oil pipe, thereby simultaneously producing steam and heat transfer oil.
It enables simultaneous heating of heat transfer oil and water, reducing equipment costs, improving heat exchange efficiency, and ensuring simplified and uniform heat distribution.
Smart Images
Figure CN121474537A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of biomass gasification boiler, in particular to a dual-working-medium biomass gasification boiler. BACKGROUND
[0002] The biomass gasification boiler converts biomass energy into heat energy, which is used for industrial heating, heating and the like, can make full use of agricultural waste, and avoid open burning to reduce pollution.
[0003] In actual production, the flue gas generated after the biomass gasification boiler burns biomass fuel heats the heat conducting oil or water storage. However, the heat demand of users is diverse, for example, users need high-temperature heat conducting oil for production during the day, and need hot water for heating at night. The existing biomass gasification boiler only outputs high-temperature heat conducting oil or water vapor, and the form of energy output is single, which is difficult to match the multi-working-condition demand of users.
[0004] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY
[0005] In view of the above shortcomings of the prior art, the purpose of the present application is to provide a dual-working-medium biomass gasification boiler to heat heat conducting oil and water at the same time.
[0006] The technical scheme of the present application is as follows: The dual-working-medium biomass gasification boiler comprises a boiler body, a reciprocating grate extending into the boiler body, and a guide pipe. The reciprocating grate carries and conveys biomass fuel. The guide pipe comprises a water supply pipe, a steam outlet pipe and a heat conducting oil pipe. The water supply pipe is arranged towards the reciprocating grate. The steam outlet pipe is arranged upwards and connected to the water supply pipe, and the end of the steam outlet pipe away from the water supply pipe extends out of the boiler body. The heat conducting oil pipe passes through the boiler body above the reciprocating grate. The heat conducting oil pipe in the boiler body is spirally wound along the inner wall of the boiler body.
[0007] A further technical scheme is that the boiler body comprises a combustion chamber and a heat exchange chamber communicating with the combustion chamber. The reciprocating grate extends into the combustion chamber. The heat exchange chamber is arranged above the combustion chamber.
[0008] A further technical scheme is that the water supply pipe extends into the bottom of the combustion chamber, and the heat conducting oil pipe passes through the heat exchange chamber and is spirally wound along the inner wall of the heat exchange chamber.
[0009] A further technical scheme is that the steam outlet pipe passes through the heat exchange chamber.
[0010] Further technical solutions are that a first slag discharge port is arranged on the combustion chamber; a second slag discharge port is arranged on the bottom of the heat exchange chamber; one end of the reciprocating grate extends into the combustion chamber along the first slag discharge port; and the second slag discharge port is arranged in the vertical direction and offset from the combustion chamber.
[0011] Further technical solutions are that a discharge conveyor belt is arranged below the boiler body in the vertical direction and aligned with the first and second slag discharge ports; and a dust hopper is arranged between the second slag discharge port and the discharge conveyor belt.
[0012] Further technical solutions are that a stand is arranged on the bottom of the heat exchange chamber; and the stand is connected to the mounting plane to support the heat exchange chamber.
[0013] Further technical solutions are that a plurality of baffles are arranged in the heat exchange chamber; adjacent baffles are arranged on opposite inner walls of the heat exchange chamber; and the baffles are arranged in parallel and alternately to form a turning flow channel.
[0014] Further technical solutions are that an exhaust port is arranged on the inner wall of the heat exchange chamber at the end of the turning flow channel away from the combustion chamber.
[0015] Further technical solutions are that the heat conduction oil pipe is spirally arranged along the inner wall of the heat exchange chamber and the baffles.
[0016] The beneficial technical effects of the present application are as follows: (1) The double-working-medium biomass gasification boiler in the present application is provided with a reciprocating grate to convey biomass into the boiler body for heating. The boiler is also provided with a water supply pipe, a steam extraction pipe, and a heat conduction oil pipe. Water in the water supply pipe is heated to generate steam, and heat conduction oil in the heat conduction oil pipe is heated. The double-working-medium biomass gasification boiler can simultaneously generate steam and hot heat conduction oil to provide heat energy to different production processes. This avoids the need to set up multiple devices and reduces equipment costs. The water supply pipe is arranged towards the reciprocating grate, and the heat conduction oil pipe passes through the boiler body above the reciprocating grate. The heat generated by the biomass in the double-working-medium biomass gasification boiler first heats the water in the water supply pipe to generate steam, and then the hot gas flow moves upward to the heat conduction oil position to heat the heat conduction oil. The heating of water and the heating of heat conduction oil are performed in a step-by-step manner to simplify the heating of water and heat conduction oil and avoid difficult control of heat distribution when water and heat conduction oil are heated simultaneously. In addition, the portion of the heat conduction oil pipe that extends into the boiler body is spirally arranged along the inner wall of the boiler body to maximize the heat exchange area of the heat conduction oil pipe, allowing the hot gas and heat conduction oil to fully exchange heat and improving the heat exchange efficiency to ensure the heating effect of the heat conduction oil. The spirally arranged heat conduction oil pipe allows the heat conduction oil to be heated evenly, avoiding local pipe wall temperature that is too high or too low, which affects the uniformity of heat conduction oil heating.
[0017] (2) Further, the steam extraction pipe passes through the heat exchange chamber to ensure the temperature of the steam and avoid a decrease in the temperature of the steam in the steam extraction pipe.
[0018] (3) Furthermore, baffles are also provided in the heat exchange chamber, and the baffles are arranged in parallel and alternately to form a zigzag flow channel. After the hot air generated by biomass enters the heat exchange chamber, the baffles guide it to flow along the zigzag flow channel, prolonging the time that the hot air stays in the heat exchange chamber, allowing the hot air to fully exchange heat and release heat, and ensuring heat exchange efficiency. Attached Figure Description
[0019] Figure 1 A schematic diagram of the internal structure of a dual-working-fluid biomass gasification boiler according to an embodiment of the present disclosure is shown in the front view.
[0020] Marked in the attached diagram: 1. Reciprocating grate; 2. Boiler body; 21. Combustion chamber; 211. First slag discharge port; 22. Heat exchange chamber; 221. Baffle plate; 222. Reversing flow channel; 223. Second slag discharge port; 224. Column; 225. Exhaust port; 3. Guide pipe; 31. Water supply pipe; 32. Steam outlet pipe; 33. Heat transfer oil pipe; 4. Discharge conveyor belt; 5. Ash hopper; 51. Discharge valve. Detailed Implementation
[0021] To make the objectives, features, and advantages of this invention more apparent and understandable, please refer to the accompanying drawings. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the implementation conditions of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed in this invention.
[0022] In the description of this invention, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.
[0023] Figure 1 A schematic diagram of the internal structure of a dual-fluid biomass gasification boiler according to an embodiment of this disclosure is shown in the front view. Please refer to... Figure 1The dual-fuel biomass gasification boiler includes a boiler body 2, a reciprocating grate 1 extending into the boiler body 2, and a flow guide pipe 3. The reciprocating grate 1 carries and transports biomass fuel. Specifically, an electric igniter (not shown) can be installed inside the boiler body 2 to ignite the biomass fuel. In some embodiments, the reciprocating grate 1 can be a commercially available DZW series inclined reciprocating grate 1. The flow guide pipe 3 includes a water supply pipe 31, a steam outlet pipe 32, and a heat transfer oil pipe 33. The water supply pipe 31 is oriented towards the reciprocating grate 1. In some embodiments, the water supply pipe 31 is connected to a steam drum (not shown), which is then connected to a water source. The steam outlet pipe 32 is oriented upwards and connected to the water supply pipe 31, with one end of the steam outlet pipe 32 extending out of the boiler body 2 away from the water supply pipe 31. The heat transfer oil pipe 33 passes through the boiler body 2 above the reciprocating grate 1 and is connected to a heat transfer oil source (not shown). The heat transfer oil pipe 33 inside the boiler body 2 is spirally coiled along the inner wall of the boiler body 2. Water in the feedwater pipe 31 is heated to produce steam, and heat transfer oil in the heat transfer oil pipe 33 is heated. The dual-medium biomass gasification boiler can simultaneously produce steam and hot heat transfer oil, providing heat energy to different production processes. This avoids the need for multiple devices, reducing equipment costs. The feedwater pipe 31 is oriented towards the reciprocating grate 1, and the heat transfer oil pipe 33 passes through the boiler body 2 above the reciprocating grate 1. The heat generated by the biomass in the dual-medium biomass gasification boiler first heats the water in the feedwater pipe 31 to produce steam, and then the hot airflow moves upwards to the heat transfer oil position to heat the heat transfer oil. This sequential heating of water and heat transfer oil simplifies the heating process and avoids the difficulty of controlling heat distribution when water and heat transfer oil are heated simultaneously. In addition, the portion of the heat transfer oil pipe 33 that extends into the boiler body 2 is spirally coiled along the inner wall of the boiler body 2, maximizing the heat exchange area of the heat transfer oil pipe 33, allowing for sufficient heat exchange between the hot air and the heat transfer oil, improving heat exchange efficiency and ensuring the heating effect of the heat transfer oil. The spiral coiling of the heat transfer oil pipe 33 around the heat source ensures uniform heating of the heat transfer oil, avoiding excessively high or low local pipe wall temperatures that could affect the uniformity of heat transfer oil heating.
[0024] Please refer to Figure 1The boiler body 2 includes a combustion chamber 21 and a heat exchange chamber 22 communicating with the combustion chamber 21. A reciprocating grate 1 extends into the combustion chamber 21. The heat exchange chamber 22 is positioned above the combustion chamber 21 to facilitate the entry of hot air generated by biomass into the heat exchange chamber 22. In some embodiments, a column 224 is provided at the bottom of the heat exchange chamber 22, and the column 224 is connected to an installation plane to support the heat exchange chamber 22. Specifically, a water supply pipe 31 extends into the bottom of the combustion chamber 21 and is positioned close to the reciprocating grate 1. A heat transfer oil pipe 33 passes through the heat exchange chamber 22 and is spirally coiled along the inner wall of the heat exchange chamber 22 to maximize the heat exchange area of the heat transfer oil pipe 33, allowing the hot air and heat transfer oil to exchange heat fully, improving heat exchange efficiency and ensuring the heating effect of the heat transfer oil. The spiral coiling of the heat transfer oil pipe 33 around the hot air ensures that the heat transfer oil is heated evenly, avoiding excessively high or low local pipe wall temperatures that could affect the uniformity of heat transfer oil heating. In some embodiments, a steam outlet pipe 32 passes through the heat exchange chamber 22. This is to ensure the temperature of the steam and prevent the temperature of the steam along the steam outlet pipe 32 from dropping.
[0025] Preferably, a first ash discharge port 211 is provided on the combustion chamber 21. A second ash discharge port 223 is provided at the bottom of the heat exchange chamber 22. One end of the reciprocating grate 1 that extends into the combustion chamber 21 extends out of the combustion chamber 21 along the first ash discharge port 211. The waste residue from biomass combustion on the reciprocating grate 1 is directly discharged into the heat exchange chamber 22 along the reciprocating grate 1 and the first ash discharge port 211, avoiding the accumulation of waste residue in the heat exchange chamber 22. In the vertical direction, the second ash discharge port 223 is staggered from the combustion chamber 21, which facilitates the discharge of large particulate impurities in the hot air into the boiler body 2 along the second ash discharge port 223.
[0026] More preferably, in the vertical direction, a discharge conveyor belt 4 is provided below the boiler body 2, aligned with the first ash discharge port 211 and the second ash discharge port 223. An ash hopper 5 is also provided between the second ash discharge port 223 and the discharge conveyor belt 4. The ash hopper 5 guides the ash and slag in the heat exchange chamber 22 onto the discharge conveyor belt 4. Along the discharge conveyor belt 4, the ash and slag are transported away from the bottom of the boiler body 2, preventing ash and slag accumulation at the bottom of the boiler body 2 from obstructing the discharge of ash and slag from the boiler body 2, and also facilitating the collection of ash and slag by cleaning personnel. In some embodiments, a discharge valve 51 can be provided on the ash hopper 5 to control the opening and closing of the ash hopper 5. The discharge valve 51 opens only after sufficient ash and slag has been collected in the ash hopper 5, preventing hot air from being discharged from the heat exchange chamber 22 through the open ash hopper 5.
[0027] Please refer to Figure 1The heat exchange chamber 22 is also equipped with baffles 221. At least two baffles 221 are arranged in parallel, with adjacent baffles 221 located on the inner wall of the opposite side of the heat exchange chamber 22. The parallel and alternating arrangement of the baffles 221 forms a zigzag flow channel 222. After the hot air generated by biomass enters the heat exchange chamber 22, the baffles 221 guide it to flow meanderingly along the zigzag flow channel 222, prolonging the residence time of the hot air in the heat exchange chamber 22, allowing the hot air to fully exchange heat and release heat, ensuring heat exchange efficiency. Specifically, the baffle 221 at the second slag discharge port 223 can be the same width as the heat exchange chamber 22, so that the hot air at the second slag discharge port 223 flows into the ash hopper 5 and then flows back into the heat exchange chamber 22, facilitating the ash and slag in the hot air to fall into the ash hopper 5.
[0028] Preferably, an exhaust port 225 is provided on the inner wall of the heat exchange chamber 22 at the end of the deflection channel 222 away from the combustion chamber 21, and hot air is discharged from the heat exchange chamber 22 along the exhaust port 225.
[0029] More preferably, the heat transfer oil pipe 33 is spirally wound along the inner wall of the heat exchange cavity 22 and the partition 221, further increasing the heat exchange area of the heat transfer oil pipe 33 and ensuring the heating effect of the heat transfer oil. In some embodiments, the connections between the water collection pipe and the combustion cavity 21, between the steam outlet pipe 32 and the combustion cavity 21, between the steam outlet pipe 32 and the heat exchange cavity 22, between the heat transfer oil pipe 33 and the heat exchange cavity 22, between the heat transfer oil pipe 33 and the partition 221, and between the partition 221 and the heat exchange cavity 22 can all be welded.
[0030] The specific workflow of this invention is as follows: The operator starts the water and heat transfer oil supply. Water flows along the water supply pipe 31 to the reciprocating grate 1, and heat transfer oil flows along the heat transfer oil pipe 33. The operator places the biomass material on the reciprocating grate 1 and starts the reciprocating grate 1, which transports the biomass material to the combustion chamber 21 for combustion. The heat from the biomass fuel combustion first heats the water in the water supply pipe 31, and the heated water flows along the steam outlet pipe 32 to the combustion chamber 21. Then, the hot air generated after the biomass fuel combustion enters the heat exchange chamber 22 upwards and flows along the reversing flow channel 222. During the flow of the hot air, it heats the spirally coiled heat transfer oil pipe 33 in the heat exchange chamber 22, as well as the steam outlet pipe 32 that passes through the heat exchange chamber 22. The steam is discharged along the steam outlet pipe 32, and the heated heat transfer oil flows out along the heat transfer oil pipe 33. The ash produced after the biomass fuel combustion is pushed by the reciprocating grate 1 and falls onto the discharge conveyor belt 4 along the first ash discharge port 211 and is carried away. The ash carried by the hot air generated by the combustion of biomass fuel falls into the ash hopper 5 along the second ash discharge port 223, and then falls onto the discharge conveyor belt 4 along the ash hopper 5 and is carried away.
[0031] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0032] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.
Claims
1. A dual-working-fluid biomass gasification boiler, characterized in that, The dual-working-fluid biomass gasification boiler includes a boiler body, a reciprocating grate extending into the boiler body, and a guide pipe. The reciprocating grate carries and transports biomass fuel. The guide pipe includes a water supply pipe, a steam outlet pipe, and a heat transfer oil pipe. The water supply pipe is positioned towards the reciprocating grate. The steam outlet pipe is positioned upward and connected to the water supply pipe, with one end of the steam outlet pipe extending out of the boiler body away from the water supply pipe. The heat transfer oil pipe passes through the boiler body above the reciprocating grate. The heat transfer oil pipe within the boiler body is spirally coiled along the inner wall of the boiler body.
2. The dual-working-fluid biomass gasification boiler as described in claim 1, characterized in that: The boiler body includes a combustion chamber and a heat exchange chamber communicating with the combustion chamber; the reciprocating grate extends into the combustion chamber; the heat exchange chamber is located above the combustion chamber.
3. The dual-working-fluid biomass gasification boiler as described in claim 2, characterized in that: The water supply pipe extends into the bottom of the combustion chamber, and the heat transfer oil pipe passes through the heat exchange chamber and is spirally coiled along the inner wall of the heat exchange chamber.
4. The dual-working-fluid biomass gasification boiler as described in claim 2, characterized in that: The steam outlet pipe passes through the heat exchange chamber.
5. The dual-working-fluid biomass gasification boiler as described in claim 2, characterized in that: A first slag discharge port is provided on the combustion chamber; a second slag discharge port is provided at the bottom of the heat exchange chamber; one end of the reciprocating grate extends into the combustion chamber and extends out of the combustion chamber along the first slag discharge port; in the vertical direction, the second slag discharge port is offset from the combustion chamber.
6. The dual-working-fluid biomass gasification boiler as described in claim 5, characterized in that: In the vertical direction, a discharge conveyor belt is provided below the boiler body, aligned with the first slag discharge port and the second slag discharge port; an ash hopper is also provided between the second slag discharge port and the discharge conveyor belt.
7. The dual-working-fluid biomass gasification boiler as described in claim 2, characterized in that: A column is provided at the bottom of the heat exchange chamber; the column is connected to the mounting plane to support the heat exchange chamber.
8. The dual-working-fluid biomass gasification boiler as described in claim 2, characterized in that: The heat exchange cavity is provided with baffles; at least two baffles are arranged in parallel, and adjacent baffles are arranged on the inner wall of the opposite side of the heat exchange cavity; the baffles are arranged in parallel and alternately to form a folding flow channel.
9. The dual-working-fluid biomass gasification boiler as described in claim 8, characterized in that: An exhaust port is provided on the inner wall of the heat exchange chamber at the end of the deflection channel away from the combustion chamber.
10. The dual-working-fluid biomass gasification boiler as described in claim 8, characterized in that: Along the inner wall of the heat exchange cavity and the partition; the heat-conducting oil pipe is spirally coiled.