High-efficiency thermal oil furnace
By installing a heat exchange tube connected to the furnace body and the cold thermal oil return pipe on the outside of the flue of the thermal oil furnace, the waste heat of the flue gas is used to preheat the cold thermal oil, which solves the problem of high-temperature flue gas waste heat loss during the use of the thermal oil furnace and realizes the improvement of waste heat recovery and thermal oil heating efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANXI QINHANG PETRIFACTION TECH CO LTD
- Filing Date
- 2025-07-31
- Publication Date
- 2026-06-30
AI Technical Summary
In existing thermal oil heaters, the high-temperature waste heat from the flue gas is not effectively recovered and utilized, resulting in heat loss. Furthermore, the reheating of cold thermal oil is energy-intensive. The core principle of thermal oil heaters is to preheat the system by utilizing the high-temperature waste heat directly emitted from the flue gas during burner combustion. The cold oil returning to the furnace in the circulation loop increases system energy consumption.
A heat exchange tube connected to the furnace body and the cold thermal oil return pipe is installed on the outside of the flue. After the cold thermal oil has completed heat exchange, it is preheated by the waste heat of the flue gas. This solves the problem that the waste heat of high-temperature flue gas is not effectively utilized during the use of thermal oil furnace.
It effectively recovers waste heat from flue gas, improves the efficiency of heat transfer oil heating, reduces energy consumption, and improves energy efficiency.
Smart Images
Figure CN224434699U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of thermal oil furnace technology, and in particular to a high-efficiency thermal oil furnace. Background Technology
[0002] Thermal oil heaters, as key thermal equipment providing continuous and stable heat energy, are widely used in various industrial production fields such as chemical, textile, and food processing. The core principle of a thermal oil heater is to utilize a burner to burn fuels such as natural gas or diesel to generate high-temperature heat energy. This heat energy is transferred to the thermal oil (usually a special mineral oil or synthetic oil) through an efficient heat transfer process, significantly raising its temperature. Subsequently, the high-temperature thermal oil, acting as a heat transfer medium, flows in a closed circulation system, delivering the heat it carries to various process units or equipment requiring heating, achieving directional and stable energy transfer and meeting the heat source requirements of different industrial processes.
[0003] During operation, the flue gas temperature produced by the burner in thermal oil heaters typically reaches 300-500℃. However, existing thermal oil heaters generally use simple pipe structures to directly discharge the flue gas into the atmosphere, failing to effectively recover and utilize this high-temperature waste heat, thus resulting in heat loss. Simultaneously, the thermal oil, whose temperature has significantly decreased after completing its heat exchange task, is directly re-entered into the thermal oil heater in the circulation loop for reheating. This method of directly returning "cold oil" to the furnace requires a large amount of additional fuel and a long heating time for the burner to reach its operating temperature again, significantly increasing the overall energy consumption of the system. Utility Model Content
[0004] This invention provides a high-efficiency thermal oil furnace to solve the problems of waste in high-temperature flue gas preheating and excessive energy consumption in cold oil reheating in existing thermal oil furnaces.
[0005] This utility model provides a high-efficiency thermal oil heater, including a main body and a collection mechanism. The main body includes a furnace body, with an oil outlet pipe inserted on one side of the upper end of the furnace body and a first oil inlet pipe inserted on the other side of the upper end of the furnace body. A second oil inlet pipe is fixedly installed at one end of the furnace body. The collection mechanism includes a flue, with the bottom end of the flue connected to the gas outlet of the furnace body. An insulation sleeve is fitted on the outside of the flue, and a heat exchange tube is fitted inside the insulation sleeve on the outside of the flue. The heat exchange tube is spiral-shaped, and the inner wall of the heat exchange tube abuts against the outer wall of the flue. One end of the heat exchange tube is connected to the second oil inlet pipe through a pipe, and the other end of the heat exchange tube is connected to the first oil inlet pipe through a pipe.
[0006] Optionally, the furnace body is equipped with a heating tube inside, the heating tube is spiral-shaped, and the outer side of the heating tube is connected to the inner wall of the furnace body.
[0007] Optionally, a burner is inserted into one end of the furnace body, and the output end of the burner extends through the furnace body into the interior.
[0008] Optionally, a temperature sensor is inserted at one end of the furnace body, with the probe of the temperature sensor located inside the furnace body.
[0009] Optionally, support frames are fixedly installed on both sides of the bottom of the furnace body, and buffer pads are installed at the bottom of the support frames.
[0010] Optionally, the furnace body, flue, heating tubes, and heat exchange tubes are all made of stainless steel.
[0011] Optionally, the inner walls of both the furnace body and the insulation jacket are provided with an insulation layer, which is made of polyurethane.
[0012] Optionally, a flow guide cap is fixedly installed at the top of the flue.
[0013] The beneficial effects of the high-efficiency thermal oil furnace provided by this utility model are as follows:
[0014] 1. By installing heat exchange tubes connected to the furnace body and the cold heat transfer oil return pipe on the outside of the flue, the cold heat transfer oil is preheated using the waste heat of the flue gas before re-entering the furnace body after heat exchange. This structure not only effectively recovers the waste heat in the flue gas and avoids heat loss, but also improves the heating efficiency of the heat transfer oil and reduces energy consumption.
[0015] 2. By setting spiral heating tubes inside the furnace, the residence time of the heat transfer oil in the furnace is extended, thereby improving the heating efficiency of the heat transfer oil. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 One of the three-dimensional structural diagrams of the high-efficiency thermal oil furnace provided in the embodiments of this utility model;
[0018] Figure 2 A second schematic diagram of the three-dimensional structure of the high-efficiency thermal oil furnace provided in this embodiment of the utility model.
[0019] Figure 3 A third schematic diagram of the three-dimensional structure of the high-efficiency thermal oil furnace provided in this embodiment of the utility model;
[0020] Figure 4 A schematic diagram of the internal structure of the high-efficiency thermal oil furnace provided in an embodiment of this utility model;
[0021] Figure 5 This is a schematic diagram of the internal structure of the insulation sleeve provided in an embodiment of the present utility model.
[0022] Explanation of reference numerals in the attached figures:
[0023] 1-Main body, 2-Collection mechanism, 101-Furnace body, 102-Burner, 103-Oil outlet pipe, 104-Support frame, 105-Second oil inlet pipe, 106-First oil inlet pipe, 107-Temperature sensor, 108-Heating tube, 201-Flue, 202-Insulation jacket, 203-Flow guide cap, 204-Heat exchange tube. Detailed Implementation
[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this utility model.
[0025] like Figure 1-5 As shown, this utility model provides a high-efficiency thermal oil heater, including a main body 1 and a collection mechanism 2. The main body 1 includes a furnace body 101, with an oil outlet pipe 103 inserted into one side of the upper end of the furnace body 101, a first oil inlet pipe 106 inserted into the other side of the upper end of the furnace body 101, and a second oil inlet pipe 105 fixedly installed at one end of the furnace body 101. The collection mechanism 2 includes a flue 201, the bottom end of which is connected to the air outlet of the furnace body 101. An insulation sleeve 202 is fitted on the outside of the flue 201, and a heat exchange tube 204 is fitted inside the insulation sleeve 202 on the outside of the flue 201. The heat exchange tube 204 is spiral in shape, and the inner wall of the heat exchange tube 204 abuts against the outer wall of the flue 201. One end of the heat exchange tube 204 is connected to the second oil inlet pipe 105 through a pipe, and the other end of the heat exchange tube 204 is connected to the first oil inlet pipe 106 through a pipe.
[0026] The main components of the high-efficiency thermal oil furnace include a main body 1 and a collection mechanism 2. The main body 1 is the primary location for heating the thermal oil, while the collection mechanism 2 is mainly used to recover heat from the flue gas. Specifically, 101 in the main body 1 is used to heat the cold thermal oil. The heated thermal oil is discharged from the furnace body 101 through the oil outlet pipe 103 and sent to the equipment requiring a heat source. After the thermal oil has completed its heating process, it is piped back to the second oil inlet pipe 105 and enters the furnace body 101 from the second oil inlet pipe 105 for reheating. The flue 201 in the collection mechanism 2 is used to discharge the flue gas generated by the combustion device (i.e., burner 102). A spiral heat exchange tube 204 is fitted on the outside of the flue 201, and an insulation sleeve 202 is fitted on the outside of the heat exchange tube 204. When the cold oil, having completed its heating process, is delivered to the thermal oil furnace via pipeline, it first enters the heat exchange tube 204 through the first oil inlet pipe 106, while simultaneously, flue gas enters the flue 201. Heat exchange occurs between the flue gas and the cold thermal oil, preheating the oil. Afterward, the flue gas exits through the flue 201, and the thermal oil enters the furnace body 101 through the first oil inlet pipe 106 for further heating.
[0027] The operation process of the high-efficiency thermal oil heater is as follows: Before use, first check the sealing and stability of the device. After the check is completed, heating can begin. During heating, the thermal oil is heated to a certain temperature inside the furnace body 101. After heating is complete, the thermal oil is discharged from the furnace body through the first oil inlet pipe 106 and sent to the heat exchange equipment for heat exchange. After heat exchange, the cold thermal oil is returned to the thermal oil heater through the pipeline and enters the heat exchange tube 204 through the second oil inlet pipe 105. It then returns to the first oil inlet pipe 106 through the heat exchange tube 204 and finally re-enters the furnace body 101 for reheating. The thermal oil inside the furnace body 101 is heated by a combustion device. The combustion device generates flue gas during operation, which is discharged through the flue 201. When the cold thermal oil enters the heat exchange tube 204 outside the flue duct, it can exchange heat with the flue gas, which preheats the cold thermal oil.
[0028] The thermal oil heater provided by this utility model has a heat exchange tube 204 connected to the furnace body 101 and the cold thermal oil return pipe on the outside of the flue 201. This allows the cold thermal oil to be preheated by the waste heat of the flue gas before it re-enters the furnace body 101 after heat exchange. This structure not only effectively recovers the waste heat in the flue gas and avoids heat loss, but also improves the heating efficiency of the thermal oil and reduces energy consumption.
[0029] like Figure 2-4As shown, the furnace body 101 is further provided with a heating tube 108 inside. The heating tube 108 is spiral in shape, and the outer side of the heating tube 108 is connected to the inner wall of the furnace body 101. Furthermore, a burner 102 is inserted into one end of the furnace body 101, and the output end of the burner 102 extends through the furnace body 101 into the interior.
[0030] The furnace body 101 of the main body 1 is equipped with a spiral heating tube 108. The inlet end of the heating tube 108 is connected to the first oil inlet pipe 106, and the outlet end is connected to the oil outlet pipe 103. The heating tube 108 is directly heated by the heat source provided by the burner 102. The heated heating tube 108 then heats the heat transfer oil in the furnace body 101. The heated heat transfer oil is output through the oil outlet pipe 103 and sent to other equipment that requires a heat source. The spiral heating tube 108 can prolong the residence time of the heat transfer oil in the furnace body 101, thereby improving the heating efficiency.
[0031] like Figure 3 As shown, a temperature sensor 107 is further inserted at one end of the furnace body 101, and the probe of the temperature sensor 107 is located inside the furnace body 101.
[0032] A temperature sensor 107 is installed inside the furnace body 101. The temperature sensor 107 monitors the temperature inside the furnace body 101 in real time, which facilitates the control of the heating temperature of the burner 102 and avoids the oil temperature from being too high or too low, thus affecting the performance.
[0033] like Figure 3 As shown, furthermore, support frames 104 are fixedly installed on both sides of the bottom end of the furnace body 101, and buffer pads are installed on the bottom end of the support frames 104.
[0034] The support frame 104 provides stable support for the furnace body 101, and the buffer pad reduces vibration during equipment operation, lowers noise, and improves overall stability.
[0035] like Figure 3 As shown, a guide cap 203 is further fixedly installed at the top of the flue 201.
[0036] The guide cap 203 guides the flue gas to be discharged smoothly, prevents rainwater or debris from entering the flue 201, and ensures smooth flue gas flow.
[0037] Furthermore, the furnace body 101, flue 201, heating tube 108, and heat exchange tube 204 are all made of stainless steel. Furthermore, the inner walls of the furnace body 101 and the insulation jacket 202 are provided with an insulation layer, which is made of polyurethane.
[0038] The stainless steel furnace body 101, flue 201, heating tube 108, and heat exchange tube 204 are resistant to high temperatures and corrosion, extending the service life of the equipment and ensuring that the heat transfer oil is clean and free from contamination. The polyurethane insulation layer reduces heat loss from the furnace body 101 and flue 201, lowers energy consumption, maintains a stable heating environment, and improves thermal efficiency.
[0039] The complete working process of the high-efficiency thermal oil furnace provided by this utility model is as follows:
[0040] like Figure 1-5 As shown, before using the high-efficiency thermal oil heater, the furnace body 101 is first securely placed on the corresponding work position using the support frame 104. Then, the sealing and stability of the device are checked. After the check is completed, heating can begin. During heating, the burner 102 heats the heating tubes 108 located inside the furnace body 101, which in turn heats the thermal oil within. During heating, the temperature sensor 107 monitors the temperature inside the furnace body 101 in real time to facilitate control of the heating temperature of the burner 102 and prevent excessively high or low oil temperatures from affecting the performance. The flue gas generated during the operation of the burner 102 is discharged through the flue 201.
[0041] After being heated to a certain temperature within the furnace body 101, the heat transfer oil is discharged from the furnace body through the first oil inlet pipe 106 and sent to the heat exchange equipment for heat exchange. After heat exchange, the cooled heat transfer oil is returned to the heat transfer oil furnace via pipelines, enters the heat exchange tube 204 through the second oil inlet pipe 105, and then returns to the first oil inlet pipe 106 via the heat exchange tube 204, finally re-entering the furnace body 101 for reheating. The heat transfer oil within the furnace body 101 is heated by a combustion device, which generates flue gas during operation. This flue gas is discharged through the flue 201. When the cooled heat transfer oil enters the heat exchange tube 204 outside the flue duct, it can exchange heat with the flue gas, preheating the cooled heat transfer oil. By installing a heat exchange pipe 204 connected to the furnace body 101 and the cold heat transfer oil return pipe on the outside of the flue 201, the cold heat transfer oil is preheated using the waste heat of the flue gas before re-entering the furnace body 101 after heat exchange. This structure not only effectively recovers the waste heat in the flue gas and avoids heat loss, but also improves the heating efficiency of the heat transfer oil and reduces energy consumption.
[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A high-efficiency thermal oil furnace, characterized in that, Includes the main body (1) and the collection agency (2); The main body (1) includes a furnace body (101), an oil outlet pipe (103) is inserted into one side of the upper end of the furnace body (101), a first oil inlet pipe (106) is inserted into the other side of the upper end of the furnace body (101), and a second oil inlet pipe (105) is fixedly installed at one end of the furnace body (101). The collecting mechanism (2) includes a flue (201), the bottom end of which is connected to the gas outlet of the furnace body (101). An insulation sleeve (202) is fitted on the outside of the flue (201). A heat exchange tube (204) is fitted inside the insulation sleeve (202) on the outside of the flue (201). The heat exchange tube (204) is spiral in shape, and the inner wall of the heat exchange tube (204) abuts against the outer wall of the flue (201). One end of the heat exchange tube (204) is connected to the second oil inlet pipe (105) through a pipe, and the other side of the heat exchange tube (204) is connected to the first oil inlet pipe (106) through a pipe.
2. The high-efficiency thermal oil furnace according to claim 1, characterized in that, The furnace body (101) is equipped with a heating tube (108) inside. The heating tube (108) is spiral in shape, and the outer side of the heating tube (108) is connected to the inner wall of the furnace body (101).
3. The high-efficiency thermal oil furnace according to claim 1, characterized in that, A burner (102) is inserted into one end of the furnace body (101), and the output end of the burner (102) extends through the furnace body (101) into the interior.
4. The high-efficiency thermal oil furnace according to claim 1, characterized in that, A temperature sensor (107) is inserted into one end of the furnace body (101), and the probe of the temperature sensor (107) is located inside the furnace body (101).
5. The high-efficiency thermal oil furnace according to claim 1, characterized in that, Support frames (104) are fixedly installed on both sides of the bottom end of the furnace body (101), and buffer pads are installed on the bottom end of the support frames (104).
6. The high-efficiency thermal oil furnace according to claim 1, characterized in that, The furnace body (101), flue (201), heating tube (108) and heat exchange tube (204) are all made of stainless steel.
7. The high-efficiency thermal oil furnace according to claim 1, characterized in that, The inner walls of the furnace body (101) and the insulation sleeve (202) are both provided with an insulation layer, which is made of polyurethane.
8. The high-efficiency thermal oil furnace according to claim 1, characterized in that, A flow guide cap (203) is fixedly installed at the top of the flue (201).