A biomass-fired thermal oil furnace

Abstract

This utility model discloses a biomass thermal oil combustion furnace, comprising a combustion furnace, a main pipeline, a thermal oil heating furnace, a blower, an air supply pipe, and a preheating pipe. A feeding device is installed on the combustion furnace, a grate is installed in the combustion chamber, an air supply pipe is installed on the blower, the thermal oil heating furnace is installed on top of the combustion furnace, an exhaust pipe is installed on top of the thermal oil heating furnace, the air supply pipe is installed in the preheating pipe, a hot air pipe is installed on the connecting channel, one end of the hot air pipe is connected to the preheating pipe, a circulation pipe is installed on the preheating pipe, and the other end of the circulation pipe is connected to the exhaust pipe. This utility model preheats the air input to the combustion furnace by recycling the waste heat of flue gas, enhancing thermal energy utilization efficiency and environmental friendliness. It also improves combustion efficiency. The layered air supply design ensures uniform combustion of biomass fuel in the combustion chamber, further improving combustion efficiency and thermal energy utilization.

Description

Technical Field

[0001] This utility model relates to the field of biomass-fired thermal oil furnaces, specifically a biomass-fired thermal oil furnace. Background Technology

[0002] Thermal oil furnaces primarily use fuel oil or natural gas, employing a burner to ignite the fuel and thermal oil as the heat carrier. A circulating oil pump forces liquid-phase circulation, transferring heat energy to the heat-using equipment before returning to a direct-flow special industrial furnace for reheating. In recent years, the development, recycling, and production of biomass fuels have received unprecedented attention. The raw materials for biomass fuels mainly come from agricultural, forestry, and timber processing waste, which is inexhaustible. After processing, biomass pellets or powders are typically produced. Combustion of these pellets or powders converts them into heat energy, providing an alternative energy source to fossil fuels for industry. This not only effectively alleviates the pressure on fossil fuel supply but also solves the problem of disposing of agricultural, forestry, and timber processing waste, while reducing CO2 and harmful gas emissions.

[0003] The existing equipment has the following shortcomings when in use: during the heating process of the heat transfer oil, the waste heat in the flue gas is often directly discharged into the atmosphere, resulting in energy waste; during the combustion of biomass fuel, air is required for combustion, and uneven mixing of air and biomass fuel leads to incomplete combustion and low thermal efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a biomass-fired thermal oil furnace to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a biomass thermal oil furnace, comprising a combustion furnace, a main pipeline, a thermal oil heating furnace, a blower, an air supply pipe, and a preheating pipe. The combustion furnace is equipped with a feeding device and a combustion chamber. A grate is installed in the combustion chamber. An air supply pipe is installed on the blower, and the other end of the air supply pipe is connected to the main pipeline installed in the combustion furnace. The thermal oil heating furnace is installed on the top of the combustion furnace. A thermal oil coil is installed on the inner wall of the flue gas passage opened in the thermal oil heating furnace. An exhaust pipe is installed on the top of the thermal oil heating furnace, and a connecting channel is provided on the exhaust pipe. The air supply pipe is installed in the preheating pipe, and a hot air pipe is installed on the connecting channel. One end of the hot air pipe is connected to the preheating pipe. A circulation pipe is installed on the preheating pipe, and the other end of the circulation pipe is connected to the exhaust pipe.

[0006] Using the above technical solution, biomass fuel is added from the feeding device and fed onto the grate in the combustion furnace for combustion in the combustion chamber. At the same time, the blower is started and air is supplied to the combustion furnace through the air supply pipe to ensure that the combustion process is fully carried out. The high-temperature flue gas generated during the combustion process enters the flue gas channel in the thermal oil heating furnace. During the flow of the flue gas, heat is exchanged with the thermal oil coil, transferring heat to the thermal oil in the thermal oil coil, thereby heating the thermal oil to provide heat energy for external equipment. After the flue gas undergoes heat exchange through the heat transfer oil coil, its temperature decreases. The low-temperature flue gas then enters the connecting channel in the exhaust pipe, and then enters the preheating pipe through the hot air pipe to preheat the air in the supply pipe, increasing the air temperature. The flue gas is then transported to the exhaust pipe through the circulation pipe and discharged. The preheated air enters the combustion furnace to further aid the combustion of biomass fuel, improving combustion efficiency and avoiding the direct emission of waste heat from the flue gas, which would otherwise lead to energy waste. By recycling the waste heat of the flue gas to preheat the air entering the combustion furnace, secondary energy utilization is achieved, enhancing thermal energy utilization efficiency and environmental friendliness, while also improving combustion efficiency.

[0007] Preferably, the inner wall of the combustion furnace is provided with a bottom layer pipe, a middle layer pipe and a top layer pipe from bottom to top. The bottom layer pipe, the middle layer pipe and the top layer pipe are respectively connected to the main pipe. Each of the bottom layer pipe, the middle layer pipe and the top layer pipe is provided with a blower head, and the blower head is connected to the combustion chamber.

[0008] Using the above technical solution, preheated air is transported through a main pipeline to the bottom, middle, and top layers of the combustion chamber, and then evenly blown into the combustion chamber through air blowers. The air blowers are evenly distributed across the bottom, middle, and top layers to improve combustion uniformity and stability. The bottom layer, close to the grate, primarily provides sufficient oxygen to support the initial combustion of biomass fuel; the middle layer, located in the middle of the combustion chamber, further optimizes the combustion process; and the top layer, located at the top of the combustion chamber, mainly supplements oxygen to ensure continuous and stable flame combustion. This layered air supply design ensures uniform combustion of biomass fuel within the combustion chamber, further improving combustion efficiency and thermal energy utilization.

[0009] Preferably, the combustion furnace is equipped with a soot blowing pipe, one end of which is equipped with a soot blowing port, the soot blowing port being parallel to the furnace drainage plane, a control valve being installed on the soot blowing pipe, and an ash discharge port being provided on the combustion furnace.

[0010] By adopting the above technical solution, when cleaning the ash and slag accumulated on the grate, the control valve is opened and gas is blown into the grate through the soot blowing pipe. Then the door of the ash discharge port is opened, and the ash and slag are discharged from the ash discharge port under the blowing of the airflow, which effectively avoids the accumulation of ash and slag from affecting the combustion efficiency.

[0011] Preferably, the heat transfer oil coil is equipped with an oil supply pipe and an oil discharge pipe.

[0012] Using the above technical solution, the oil supply pipe is responsible for transporting the heat transfer oil to be heated into the heat transfer oil coil. As the heat transfer oil flows within the coil, it absorbs heat from the high-temperature flue gas, thus achieving the heating process. The oil discharge pipe is responsible for discharging the heated heat transfer oil from the heat transfer oil coil and transporting it to external equipment for thermal energy utilization.

[0013] Preferably, the bottom tube, middle tube, and top tube are arranged in a ring around the combustion chamber.

[0014] By adopting the above technical solution, this annular design ensures that the preheated air can be evenly blown into the combustion chamber. This evenly distributed air supply method not only improves the uniformity and stability of combustion, but also further optimizes the combustion process, enabling biomass fuel to burn more completely and release more heat energy.

[0015] Preferably, the air supply duct is made of a high thermal conductivity material.

[0016] By adopting the above technical solution and selecting high thermal conductivity materials, the heat conduction efficiency of the air supply duct is improved, which enables the heat in the preheating pipe to be transferred to the air in the air supply duct more effectively, thereby further improving the air preheating effect.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. After the flue gas passes through the heat exchange coil of the heat transfer oil, its temperature decreases. The low-temperature flue gas then enters the connecting channel in the exhaust pipe, and then enters the preheating pipe through the hot air pipe to preheat the air in the supply pipe, increasing the air temperature. The flue gas is then transported to the exhaust pipe through the circulation pipe and discharged. The preheated air enters the combustion furnace to further aid the combustion of biomass fuel, improve combustion efficiency, and avoid the direct emission of waste heat from the flue gas, which would cause energy waste. By recycling the waste heat of the flue gas to preheat the air entering the combustion furnace, the secondary utilization of energy is achieved, enhancing the thermal energy utilization efficiency and environmental protection, while also improving combustion efficiency.

[0019] 2. Preheated air is transported through a main duct to the bottom, middle, and top layers of the combustion chamber, and then evenly blown into the combustion chamber through blowers. These blowers are evenly distributed across the bottom, middle, and top layers to improve combustion uniformity and stability. The bottom layer, located near the grate, primarily provides sufficient oxygen to support the initial combustion of biomass fuel. The middle layer, situated in the middle of the combustion chamber, further optimizes the combustion process. The top layer, located at the top of the combustion chamber, mainly supplements oxygen to ensure continuous and stable flame combustion. This stratified air supply design ensures uniform combustion of biomass fuel within the combustion chamber, further improving combustion efficiency and thermal energy utilization. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0022] Figure 3 This is a top view of the combustion furnace structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the air supply structure of this utility model.

[0024] In the diagram: 1. Combustion furnace; 2. Grate; 3. Feeding device; 4. Ash discharge port; 5. Combustion chamber; 6. Main pipe; 7. Middle layer pipe; 8. Bottom layer pipe; 9. Top layer pipe; 10. Blower head; 11. Thermal oil heater; 12. Thermal oil coil; 13. Blower; 14. Air supply pipe; 15. Preheating pipe; 16. Hot air pipe; 17. Circulation pipe; 18. Exhaust pipe; 19. Connecting passage; 20. Ash blowing pipe; 21. Oil discharge pipe; 22. Oil supply pipe; 23. Flue gas passage; 24. Ash blowing port; 25. Control valve. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] Please see Figure 1-4This utility model provides an embodiment of a biomass thermal oil furnace, comprising a combustion furnace 1, a main pipe 6, a thermal oil heating furnace 11, a blower 13, an air supply pipe 14, and a preheating pipe 15. A feeding device 3 is installed on the combustion furnace 1. A combustion chamber 5 is provided in the combustion furnace 1, and a grate 2 is installed in the combustion chamber 5. The air supply pipe 14 is installed on the blower 13, and the other end of the air supply pipe 14 is connected to the main pipe 6 installed in the combustion furnace 1. Thermal oil is installed on the top of the combustion furnace 1. The heating furnace 11 has a heat transfer oil coil 12 installed on the inner wall of the flue gas passage 23. The top of the heat transfer oil heating furnace 11 is equipped with a flue gas pipe 18, and a connecting passage 19 is provided on the flue gas pipe 18. The air supply pipe 14 is installed in the preheating pipe 15. A hot air pipe 16 is installed on the connecting passage 19. One end of the hot air pipe 16 is connected to the preheating pipe 15. A circulation pipe 17 is installed on the preheating pipe 15, and the other end of the circulation pipe 17 is connected to the flue gas pipe 18. Biomass fuel is added from the feeding device 3 and fed onto the grate 2 in the combustion furnace 1, where it is burned in the combustion chamber 5. At the same time, the blower 13 is started and air is sent into the combustion furnace 1 through the air supply pipe 14 to ensure that the combustion process is fully carried out. The high-temperature flue gas generated during the combustion process enters the flue gas passage 23 in the thermal oil heating furnace 11. During the flow of the flue gas, it exchanges heat with the thermal oil coil 12, transferring heat to the thermal oil in the thermal oil coil 12, thereby heating the thermal oil to provide heat energy for external equipment. After the flue gas passes through the heat exchange coil 12, its temperature decreases. The low-temperature flue gas then enters the connecting channel 19 in the exhaust pipe 18, and then enters the preheating pipe 15 through the hot air pipe 16 to preheat the air in the air supply pipe 14, increasing the air temperature. The flue gas is then transported to the exhaust pipe 18 through the circulation pipe 17 and discharged. The preheated air enters the combustion furnace 1 to further aid the combustion of biomass fuel, improve combustion efficiency, and avoid the direct emission of waste heat from the flue gas, which would cause energy waste. By recycling the waste heat of the flue gas to preheat the air entering the combustion furnace, the secondary utilization of energy is achieved, enhancing the thermal energy utilization efficiency and environmental protection, while also improving combustion efficiency.

[0027] The inner wall of the combustion furnace 1 is equipped with a bottom layer pipe 8, a middle layer pipe 7, and a top layer pipe 9, arranged from bottom to top. These pipes are connected to a main pipe 6. Each pipe has a blower head 10, which communicates with the combustion chamber 5. Preheated air is transported through the main pipe 6 to the bottom layer pipes 8, 7, and 9, and then evenly blown into the combustion chamber 5 through the blower heads 10. The blower heads 10 are evenly distributed across the bottom layer pipes 8, 7, and 9 to improve combustion uniformity and stability. The bottom layer pipe 8, located near the grate 2, primarily provides sufficient oxygen to support the initial combustion of biomass fuel. The middle layer pipe 7, situated in the middle of the combustion chamber 5, further optimizes the combustion process. The top layer pipe 9, located at the top of the combustion chamber 5, primarily supplements oxygen to ensure continuous and stable flame combustion. This layered air supply design ensures uniform combustion of biomass fuel within the combustion chamber, further improving combustion efficiency and thermal energy utilization.

[0028] The combustion furnace 1 is equipped with a soot blowing pipe 20, one end of which is fitted with a soot blowing port 24. The soot blowing port 24 is parallel to the horizontal plane of the grate 2. A control valve 25 is installed on the soot blowing pipe 20. The combustion furnace 1 is also equipped with an ash discharge port 4. When cleaning the ash accumulated on the grate 2, the control valve 25 is opened, and gas is blown into the grate 2 through the soot blowing pipe 20. Then, the door of the ash discharge port 4 is opened, and the ash is discharged from the ash discharge port 4 under the blowing of the airflow, effectively preventing ash accumulation from affecting combustion efficiency.

[0029] The heat transfer oil coil 12 is equipped with an oil supply pipe 22 and an oil discharge pipe 21. The oil supply pipe 22 is responsible for delivering the heat transfer oil to be heated into the heat transfer oil coil 12. As the heat transfer oil flows inside the coil, it absorbs the heat from the high-temperature flue gas, thus realizing the heating process. The oil discharge pipe 21 is responsible for discharging the heated heat transfer oil from the heat transfer oil coil 12 and delivering it to external equipment for thermal energy utilization.

[0030] The bottom layer pipe 8, the middle layer pipe 7, and the top layer pipe 9 are arranged in a ring around the combustion chamber 5. This ring arrangement ensures that the preheated air can be evenly blown into the combustion chamber. This evenly distributed air supply method not only improves the uniformity and stability of combustion, but also further optimizes the combustion process, allowing biomass fuel to burn more completely and release more heat energy.

[0031] The air supply duct 14 is made of a high thermal conductivity material. The choice of a high thermal conductivity material improves the heat transfer efficiency of the air supply duct 14, allowing the heat in the preheating pipe 15 to be transferred more effectively to the air in the air supply duct 14, further enhancing the air preheating effect.

[0032] Working principle: Biomass fuel is added from the feeding device 3 and fed onto the grate 2 in the combustion furnace 1, where it is burned in the combustion chamber 5. At the same time, the blower 13 is started and air is sent into the combustion furnace 1 through the air supply pipe 14 to ensure that the combustion process is fully carried out. The high-temperature flue gas generated during the combustion process enters the flue gas passage 23 in the thermal oil heating furnace 11. During the flow of the flue gas, it exchanges heat with the thermal oil coil 12, transferring heat to the thermal oil in the thermal oil coil 12, thereby heating the thermal oil to provide heat energy for external equipment. After the flue gas passes through the heat exchange coil 12, its temperature decreases. The low-temperature flue gas then enters the connecting channel 19 in the exhaust pipe 18, and then enters the preheating pipe 15 through the hot air pipe 16 to preheat the air in the supply air pipe 14, increasing the air temperature. The flue gas is then transported to the exhaust pipe 18 through the circulation pipe 17 and discharged. The preheated air enters the combustion furnace 1 to further aid the combustion of biomass fuel, improving combustion efficiency and avoiding energy waste caused by the direct emission of flue gas waste heat. By recycling the waste heat of flue gas to preheat the air entering the combustion furnace, secondary energy utilization is achieved, enhancing thermal energy utilization efficiency and... This design is environmentally friendly and improves combustion efficiency. Preheated air is transported through the main duct 6 to the bottom layer pipe 8, middle layer pipe 7, and top layer pipe 9, and then evenly blown into the combustion chamber 5 through air blowers 10. The air blowers 10 are evenly distributed across the bottom layer pipe 8, middle layer pipe 7, and top layer pipe 9 to improve combustion uniformity and stability. The bottom layer pipe 8, located near the grate 2, primarily provides sufficient oxygen to support the initial combustion of biomass fuel. The middle layer pipe 7, located in the middle of the combustion chamber 5, further optimizes the combustion process. The top layer pipe 9, located at the top of the combustion chamber 5, primarily supplements oxygen to ensure continuous and stable flame combustion. This layered air supply design ensures uniform combustion of biomass fuel within the combustion chamber, further improving combustion efficiency and thermal energy utilization.

[0033] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A biomass-fired thermal oil furnace comprising a combustion furnace (1), a main pipe (6), a thermal oil heating furnace (11), a blower (13), an air supply pipe (14) and a preheating pipe (15), characterized in that: A feeding device (3) is installed on the combustion furnace (1). A combustion chamber (5) is provided in the combustion furnace (1). A grate (2) is installed in the combustion chamber (5). An air supply pipe (14) is installed on the blower (13). The other end of the air supply pipe (14) is connected to the main pipe (6) installed in the combustion furnace (1). A thermal oil heater (11) is installed on the top of the combustion furnace (1). A flue gas passage (23) opened in the thermal oil heater (11) is provided with a guide gas duct. A hot oil coil (12) is provided. A flue pipe (18) is installed on the top of the thermal oil heater (11). A connecting channel (19) is provided on the flue pipe (18). An air supply pipe (14) is installed in the preheating pipe (15). A hot air pipe (16) is installed on the connecting channel (19). One end of the hot air pipe (16) is connected to the preheating pipe (15). A circulation pipe (17) is installed on the preheating pipe (15). The other end of the circulation pipe (17) is connected to the flue pipe (18).

2. A biomass-fired conduction oil boiler according to claim 1, characterized in that The inner wall of the combustion furnace (1) is equipped with a bottom layer pipe (8), a middle layer pipe (7) and a top layer pipe (9) from bottom to top. The bottom layer pipe (8), the middle layer pipe (7) and the top layer pipe (9) are respectively connected to the main pipe (6). Each of the bottom layer pipe (8), the middle layer pipe (7) and the top layer pipe (9) is provided with a blower head (10), and the blower head (10) is connected to the combustion chamber (5).

3. The biomass-fired furnace according to claim 1, characterized in that: The combustion furnace (1) is equipped with a soot blowing pipe (20), and a soot blowing port (24) is installed at one end of the soot blowing pipe (20). The soot blowing port (24) is parallel to the horizontal plane of the grate (2). A control valve (25) is installed on the soot blowing pipe (20). An ash discharge port (4) is provided on the combustion furnace (1).

4. The biomass-fired conduction oil boiler according to claim 1, characterized in that: The heat transfer oil coil (12) is equipped with an oil supply pipe (22) and an oil discharge pipe (21).

5. A biomass-fired furnace according to claim 2, characterized in that: The bottom tube (8), middle tube (7) and top tube (9) are arranged in a ring around the combustion chamber (5).

6. A biomass-fired furnace according to claim 1, characterized in that: The air supply duct (14) is made of a high thermal conductivity material.

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