Household miniature heat-conducting oil furnace system

Abstract

The utility model relates to a household miniature heat-conducting oil furnace system, which adopts a liquid-phase organic heat carrier internal circulation heat regeneration technology combining a coal economizer and an air pre-heater outside the furnace to recover flue gas waste heat, effectively avoids low-temperature corrosion of flue gas, and simultaneously realizes high-temperature efficient heat utilization of the heat-conducting oil furnace technology in families. The implementation and popularization of the method have excellent economic and social significance.

Description

Technical Field

[0001] This utility model belongs to the field of boiler technology, and specifically relates to a household micro thermal oil boiler system that uses economizer and external air preheater regeneration technology. Background Technology

[0002] Currently, household electric rice cookers, electric kettles, and electric water heaters commonly use electricity as their energy source for cooking, boiling water, and providing hot water, offering convenience and speed. However, as a secondary energy source for heating, electricity's actual overall thermal efficiency is not high. Taking a domestically produced 30MW condensing steam generator set as an example, the thermal efficiency of the power generation fuel is between 30% and 35%. Adding transmission line losses, the fuel's thermal efficiency is approximately 27% to 32%. Even if 100% of the electrical energy is converted into heat, the overall thermal efficiency of the fuel is only around 30%.

[0003] Taking household gas stoves as an example, the thermal efficiency of gas in domestic gas stoves is between 55% and 63%. When gas is used to heat cooking utensils such as steamers, kettles, and woks, the overall thermal efficiency of the fuel is between 14% and 20% when the stove uses an open flame heating method. If the gas stove uses a jacket or water jacket around the lower part of the cooking utensils to recover heat, the overall thermal efficiency of the gas is around 28%.

[0004] A thermal oil boiler (also known as an organic heat carrier boiler) is a special type of boiler that uses organic heat carrier, namely thermal oil, as the working medium. The thermal oil is heated by the high-temperature flue gas generated by fuel combustion. After the thermal oil temperature rises, it provides the heat required by the heat-using equipment. However, when the flue gas generated after fuel combustion is discharged through the chimney, the temperature is generally around 250°C, and sometimes even as high as 350°C. This not only wastes heat but also causes thermal pollution to the environment.

[0005] Industrial thermal oil boilers utilize air preheaters to recover some waste heat from flue gas, but this presents the problem of low-temperature corrosion in the air preheaters. Some processes incorporate waste heat recovery devices with steam generators, such as heat pipe boilers. For example, ZL200420027889.4 provides a waste heat recovery device for thermal oil boiler exhaust gas with a steam generator. This technology can reduce the exhaust gas temperature of the thermal oil boiler to around 160℃ and recover a certain amount of steam. However, if the user of the thermal oil boiler does not require the steam generated by the waste heat recovery process, or if the steam load changes, the common phenomenon of excess steam being released from the steam generator will occur. This greatly limits the use of such technologies, and the overall thermal efficiency of organic heat carrier boilers remains low, failing to meet energy conservation and environmental protection requirements.

[0006] Therefore, how to rationally recover and utilize the waste heat from the flue gas of thermal oil heaters, reduce the exhaust temperature, avoid low-temperature corrosion, improve the overall thermal efficiency of thermal oil heaters, and realize the high-temperature and high-efficiency application of thermal oil heater technology in homes has become a research hotspot in this field. Utility Model Content

[0007] The purpose of this invention is to overcome the shortcomings of the existing technology by using economizer and external air preheater reheating technology to effectively avoid low-temperature corrosion of the economizer by flue gas, and realize high-temperature and high-efficiency heat utilization of thermal oil furnace technology in the home.

[0008] The objective of this utility model is achieved through the following measures:

[0009] A household miniature thermal oil heater system, characterized in that the system employs a miniature thermal oil heater, wherein the rated thermal power of the miniature thermal oil heater used in the system is ≤99.9KW, comprising:

[0010] Thermal oil furnace body 1, heats thermal oil.

[0011] Air is fed into burner 2 and mixed with fuel for combustion. The high-temperature flue gas produced by combustion enters the thermal oil furnace body 1 to be cooled before being discharged from flue 9.

[0012] Heat transfer oil pump 7 pressurizes and transports heat transfer oil.

[0013] Thermal storage oil tank 5 serves as a heat storage device for heat storage.

[0014] Economizer 15 recovers waste heat from flue gas in flue 9.

[0015] The external air preheater 12 heats the air, which then enters the burner 2 as combustion air.

[0016] The thermal oil in the heat storage tank 5 is pressurized by the thermal oil pump 7. After being pressurized, the thermal oil enters the thermal oil furnace body 1 for heating and then returns to the heat storage tank 5. The economizer 15 is arranged in the flue 9. The flue gas with a high temperature in the flue 9 is discharged after being cooled by the economizer 15. The thermal oil drawn from the outlet of the thermal oil pump 7 and the heat storage tank 5 is cooled by the external air preheater 12 and then enters the economizer 15 to recover the heat of the flue gas. The thermal oil with a higher temperature coming out of the economizer 15 returns to the inlet pipeline of the thermal oil pump 7 and is then transported to the burner 2 as combustion air by the hot air 14 generated by the blower 10 and the external air preheater 12.

[0017] The heat transfer oil in the heat storage oil tank 5 is returned to the heat storage oil tank 5 through the heat transfer oil pump 7 and the oil heater 3, or the heat transfer oil in the heat storage oil tank 5 is returned to the heat storage oil tank 5 through the heat transfer oil pump 7, the heat transfer oil furnace body 1, and the oil heater 3.

[0018] After the heat transfer oil in the heat storage oil tank 5 completes the heat storage process, the burner 2 and blower 10 do not need to be started, and the heating process of the oil heater 3 can be realized by using the heat transfer oil in the heat storage oil tank 5.

[0019] The oil heater 3 includes a heating unit 4. The heat transfer oil from the heat storage oil tank 5 is pumped into the heating unit 4 via the heat transfer oil pump 7 as the heat source of the oil heater 3. The heat transfer oil from the heating unit 4 returns to the heat storage oil tank 5, thus forming a heat utilization loop of the heat storage oil in the heat storage oil tank 5.

[0020] The oil heater 3 includes oil-heated kettles, oil-heated rice cookers, oil-heated mini kitchen appliances, oil-heated steamers, oil-heated heaters, oil-heated frying pans, etc., which use heat-conducting oil for heating. They are used to replace traditional electric kettles, electric rice cookers, electric mini kitchen appliances, electric steamers, electric heaters, electric frying pans, etc., and their functional design is based on these electric heating devices.

[0021] When the oil heater 3 is in use, it uses high-temperature heat transfer oil stored in the heat storage oil tank 5. Its temperature is higher than 350℃, which can meet the rapid heating requirements for boiling water, steaming rice, cooking rice, making porridge, and heating.

[0022] Preferably, the contact portion between the oil heater 3 and the heating unit 4 adopts the same structural design, thereby enhancing the flexibility and versatility of the heating unit 4 and the oil heater 3. The heating unit 4 adopts a planar heating surface structure, such as a flat hollow cavity structure or a square tube coil made of a hollow cavity, and employs known heat transfer enhancement measures.

[0023] Furthermore, oil heaters 3 with different functions can be connected to the heat utilization circuit in series, parallel, or series-parallel configurations.

[0024] The burner 2 of the micro thermal oil furnace uses coal, biomass, oil or gas as fuel.

[0025] The external air preheater 12 adopts an indirect heat exchange method, and the heat exchange tubes are plain tubes, finned tubes or spiral groove tubes.

[0026] The economizer 15 adopts an indirect heat exchange method, and the heat exchange tubes are plain tubes, finned tubes or spiral groove tubes.

[0027] The economizer 15 is a serpentine tube heat exchanger, a shell-and-tube heat exchanger, or other types of heat exchangers.

[0028] Preferably, the internal circulation heat transfer oil pipeline 11 is connected from the pipeline between the outlet of the heat transfer oil pump 7 and the heat transfer oil furnace body 1, and enters the external air preheater 12 to heat the air sent into the external air preheater 12 from the blower 10.

[0029] By controlling the inlet temperature of the heat transfer oil in the economizer 15 (for example, above 85℃, with the appropriate temperature determined based on the sulfur content of the fuel), the low-temperature corrosion of the economizer 15 can be effectively avoided. Under the premise of avoiding condensation, the waste heat of the flue gas can be utilized to the maximum extent, enabling the heat transfer oil furnace to operate economically and with high thermal efficiency, thereby achieving the goal of energy saving and consumption reduction.

[0030] Preferably, the heat storage oil tank 5 is equipped with a safety valve 17, an exhaust valve 18, and a discharge valve 8.

[0031] It should be noted that in daily life, if frying, stir-frying, cooking, or deep-frying is required, a high temperature of 300-600℃ is needed. However, food-grade heat transfer oils that are actually used can withstand a high temperature of around 450℃. Once selected, they can basically meet the requirements for frying, stir-frying, cooking, and deep-frying.

[0032] The aforementioned miniature thermal oil furnace can employ a special thermal oil encapsulation process: after the assembled miniature thermal oil furnace and its oil circuit pipes, valves, and auxiliary facilities have passed purging, airtightness testing, and hydraulic testing, the thermal oil in the assembled miniature thermal oil furnace is dehydrated and degassed in the manufacturing unit. After passing the dehydration and degassing process, nitrogen is used to replace the air remaining in the miniature thermal oil furnace, followed by encapsulation and heat preservation; or the assembled miniature thermal oil furnace system is first purged with nitrogen, and then dehydrated and degassed thermal oil is injected, encapsulated, and heat-preserved.

[0033] A filter 6 is provided to filter out solid impurity particles that may appear in the heat transfer oil at the inlet of the heat transfer oil pump 7.

[0034] The heat storage oil tank 5 in the miniature thermal oil heater plays the role of oil-gas separation, buffering, heat storage and storage. It needs to take heat preservation measures. The design temperature range of the outer surface of the insulation is preferably 25 to 30°C. The heat storage oil tank 5 adopts a horizontal or vertical structure to facilitate the compact arrangement of the stove system. Preferably, the heat storage oil tank 5 adopts a vertical structure.

[0035] The rated thermal power of the miniature thermal oil heater in this system is ≤99.9KW, which is lower than the current national safety technical specifications (TSG11-2020 Boiler Safety Technical Specifications) and therefore does not fall under the regulatory scope of pressure-bearing special equipment. The material selection for the pressure-bearing components of the miniature thermal oil heater shall comply with the TSG11-2020 Boiler Safety Technical Specifications, while other parts shall be implemented with reference to these specifications, provided that safety is ensured.

[0036] The parts not covered by this utility model are implemented using existing technology, that is, existing mature and reliable reasonable improvement measures can be introduced into this system, such as setting necessary valves, automatic control facilities, etc.

[0037] Compared with the prior art, the present invention has the following advantages:

[0038] 1. Energy saving: Compared with traditional gas, oil, coal and straw stoves, electric stoves and electric water heaters, the micro thermal oil furnace technology, combined with mature boiler and heat transfer device design technology, improves the overall heat utilization efficiency of household stove fuel by more than 100%. It realizes the efficient internal circulation of waste heat from the thermal oil furnace flue gas, while using heat-storing thermal oil to achieve high-temperature and efficient heat utilization. It has great economic and application significance and has great promotion value.

[0039] 2. Safety: The flame of traditional fuel stoves is in direct contact with the cooking utensils. If the stove is left unattended, the risk of flameout and gas leakage is extremely high, and it is easy to burn dry, burn, or char. However, using heat-storing heat transfer oil as a heat source, the heat medium system is reliably sealed. The heat transfer oil temperature is above 350℃, which can meet the daily needs of boiling water, cooking rice, making porridge, or steaming. The functional design of oil kettles, oil rice cookers, and oil steamers can be based on electric kettles and rice cookers, and there will be no burning or charring. Even if it burns dry, the danger is not great.

[0040] 3. Environmental Protection: Energy conservation is the most significant emission reduction. The system can reduce pollutants and carbon emissions in multiple ways, reducing CO2 emissions by 40%, SO2 emissions by 100%, and NO emissions by [missing information] compared to electrically driven air conditioning. X Emissions exceed 60%;

[0041] 4. Efficiency: my country is already a major energy consumer, but its energy utilization efficiency is extremely low, with the national average being only about 34%, far below the 50% to 55% level of developed countries. The technology applied for in this utility model is essentially an optimized household energy island. Conservatively estimated, the comprehensive utilization efficiency of household energy is over 55%. If combined with solar thermal utilization, the economic, social, and environmental benefits will be even greater, and it is confident that it can be increased to over 62%.

[0042] 5. Easy and compact installation: Through optimized design, this system can be configured into a quick-installation structure according to the actual situation of the kitchen, making installation compact and convenient. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of a household miniature thermal oil heater system according to the present invention.

[0044] Figure 1 In the middle, 1-thermal oil furnace body, 2-burner, 3-oil heater, 4-heating unit, 5-heat storage oil tank, 6-filter, 7-thermal oil pump, 8-exhaust valve, 9-flue, 10-blower, 11-internal circulation thermal oil pipeline, 12-external air preheater, 13-cold oil pipeline, 14-hot air, 15-economizer, 16-thermal oil regeneration pipeline, 17-safety valve, 18-exhaust valve. Detailed Implementation

[0045] The following is in conjunction with the appendix Figure 1 The present invention will be further described in detail with reference to specific embodiments.

[0046] Example 1:

[0047] A household miniature thermal oil heater system, wherein the system employs a miniature thermal oil heater with a rated thermal power ≤99.9KW, comprising:

[0048] Thermal oil furnace body 1, heats thermal oil.

[0049] Air is fed into burner 2 and mixed with fuel for combustion. The high-temperature flue gas produced by combustion enters the thermal oil furnace body 1 to be cooled before being discharged from flue 9.

[0050] Heat transfer oil pump 7 pressurizes and transports heat transfer oil.

[0051] Thermal storage oil tank 5 serves as a heat storage device for heat storage.

[0052] Economizer 15 recovers waste heat from flue gas in flue 9.

[0053] The external air preheater 12 heats the air, which then enters the burner 2 as combustion air.

[0054] The heat transfer oil in the heat storage oil tank 5 is pressurized through the filter 6 and the heat transfer oil pump 7. After being pressurized, the heat transfer oil enters the heat transfer oil furnace body 1 for heating and then returns to the heat storage oil tank 5. The economizer 15 is arranged in the flue 9. The flue gas with a high temperature in the flue 9 is discharged after being cooled by the economizer 15. The heat transfer oil in the internal circulation heat transfer oil pipeline 11, which is drawn from the outlet of the heat transfer oil furnace body 1 and the heat storage oil tank 5, is cooled by the external air preheater 12 and then enters the economizer 15 through the cold oil pipeline 13 to recover the heat of the flue gas. The heat transfer oil with a higher temperature coming out of the economizer 15 returns to the heat storage oil tank 5 and is then transported to the burner 2 as combustion air by the hot air 14 formed by the blower 10 and the external air preheater 12.

[0055] The heat transfer oil in the heat storage oil tank 5 is returned to the heat storage oil tank 5 through the heat transfer oil pump 7, the heat transfer oil furnace body 1, and the oil heater 3.

[0056] After the heat transfer oil in the heat storage oil tank 5 completes the heat storage process, the burner 2 and blower 10 do not need to be started, and the heating process of the oil heater 3 can be achieved by using the heat transfer oil in the heat storage oil tank 5.

[0057] The oil heater 3 includes a heating unit 4. The heat transfer oil from the heat storage oil tank 5 is pumped into the heating unit 4 via the heat transfer oil pump 7 as the heat source of the oil heater 3. The heat transfer oil from the heating unit 4 returns to the heat storage oil tank 5, thus forming a heat utilization loop of the heat storage oil in the heat storage oil tank 5.

[0058] The oil heater 3 includes oil-heated kettles, oil-heated rice cookers, oil-heated mini kitchen appliances, oil-heated steamers, oil-heated heaters, oil-heated frying pans, etc., which use heat-conducting oil for heating. They are used to replace traditional electric kettles, electric rice cookers, electric mini kitchen appliances, electric steamers, electric heaters, electric frying pans, etc., and their functional design is based on these electric heating devices.

[0059] When the oil heater 3 is in use, it uses high-temperature heat transfer oil stored in the heat storage oil tank 5. Its temperature is higher than 350℃, which can meet the rapid heating requirements for boiling water, steaming rice, cooking rice, making porridge, and heating.

[0060] Preferably, the contact portion between the oil heater 3 and the heating unit 4 adopts the same structural design, thereby enhancing the flexibility and versatility of the heating unit 4 and the oil heater 3. The heating unit 4 adopts a planar heating surface structure, such as a flat hollow cavity structure or a square tube coil made of a hollow cavity, and employs known heat transfer enhancement measures.

[0061] Furthermore, oil heaters 3 with different functions can be connected to the heat utilization circuit in series, parallel, or series-parallel configurations.

[0062] The burner 2 of the micro thermal oil furnace uses gas as fuel.

[0063] The external air preheater 12 adopts an indirect heat exchange method, and the heat exchange tubes are finned tubes or spiral groove tubes.

[0064] The economizer 15 adopts an indirect heat exchange method, and the heat exchange tubes are plain tubes, finned tubes or spiral groove tubes.

[0065] The economizer 15 is a serpentine tube heat exchanger.

[0066] Preferably, the internal circulation heat transfer oil pipeline 11 is connected from the pipeline between the outlet of the heat transfer oil pump 7 and the heat transfer oil furnace body 1, and enters the external air preheater 12 to heat the air sent into the external air preheater 12 from the blower 10.

[0067] By controlling the inlet temperature of the heat transfer oil in the economizer 15 (for example, above 85℃, with the appropriate temperature determined based on the sulfur content of the fuel), the low-temperature corrosion of the economizer 15 can be effectively avoided. Under the premise of avoiding condensation, the waste heat of the flue gas can be utilized to the maximum extent, enabling the heat transfer oil furnace to operate economically and with high thermal efficiency, thereby achieving the goal of energy saving and consumption reduction.

[0068] Preferably, the heat storage oil tank 5 is equipped with a safety valve 17, an exhaust valve 18, and a discharge valve 8.

[0069] It should be noted that in daily life, if frying, stir-frying, cooking, or deep-frying is required, a high temperature of 300-600℃ is needed. However, food-grade heat transfer oils that are actually used can withstand a high temperature of around 450℃. Once selected, they can basically meet the requirements for frying, stir-frying, cooking, and deep-frying.

[0070] The aforementioned miniature thermal oil furnace can employ a special thermal oil encapsulation process: after the assembled miniature thermal oil furnace and its oil circuit pipes, valves, and auxiliary facilities have passed purging, airtightness testing, and hydraulic testing, the thermal oil in the assembled miniature thermal oil furnace is dehydrated and degassed in the manufacturing unit. After passing the dehydration and degassing process, nitrogen is used to replace the air remaining in the miniature thermal oil furnace, followed by encapsulation and heat preservation; or the assembled miniature thermal oil furnace system is first purged with nitrogen, and then dehydrated and degassed thermal oil is injected, encapsulated, and heat-preserved.

[0071] The heat storage oil tank 5 in the miniature thermal oil heater plays the role of oil-gas separation, buffering, heat storage and storage. It needs to take heat preservation measures. The design temperature range of the outer surface of the insulation is preferably 25 to 30°C. The heat storage oil tank 5 adopts a horizontal or vertical structure to facilitate the compact arrangement of the stove system. Preferably, the heat storage oil tank 5 adopts a vertical structure.

[0072] The rated thermal power of the miniature thermal oil heater in this system is ≤99.9KW, which is lower than the current national safety technical specifications (TSG11-2020 Boiler Safety Technical Specifications) and therefore does not fall under the regulatory scope of pressure-bearing special equipment. The material selection for the pressure-bearing components of the miniature thermal oil heater shall comply with the TSG11-2020 Boiler Safety Technical Specifications, while other parts shall be implemented with reference to these specifications, provided that safety is ensured.

[0073] The parts not covered by this utility model are implemented using existing technology, that is, existing mature and reliable reasonable improvement measures can be introduced into this system.

[0074] Although the present invention has been disclosed above with reference to preferred embodiments, these are not intended to limit the present invention. Any person skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention, and these changes and modifications also fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the claims of this application.

Claims

1. A household miniature thermal oil heater system, characterized in that: The household miniature thermal oil heater system uses a miniature thermal oil heater with a rated thermal power ≤99.9KW, including: The heat transfer oil furnace body (1) heats the heat transfer oil. Air is fed into the burner (2) and mixed with fuel for combustion. The high-temperature flue gas generated by combustion enters the thermal oil furnace body (1) to reduce its temperature before being discharged from the flue (9). The heat transfer oil pump (7) pressurizes and transports the heat transfer oil. The heat storage oil tank (5) serves as a heat storage device for heat storage. Economizer (15) recovers waste heat from flue gas in flue gas (9). An external air preheater (12) heats air and introduces it into the burner (2) as combustion air. The heat transfer oil in the heat storage tank (5) is pressurized by the heat transfer oil pump (7). After being pressurized, the heat transfer oil enters the heat transfer oil furnace body (1) for heating and then returns to the heat storage tank (5). The economizer (15) is arranged in the flue (9). The flue gas with a higher temperature in the flue (9) is discharged after being cooled by the economizer (15). The heat transfer oil drawn from the outlet of the heat transfer oil pump (7) and the heat storage tank (5) is cooled by the external air preheater (12) and then enters the economizer (15) to recover the heat of the flue gas. The heat transfer oil with a higher temperature coming out of the economizer (15) returns to the inlet pipeline of the heat transfer oil pump (7) and is transported to the burner (2) as combustion air by the hot air (14) formed by the blower (10) and the external air preheater (12). The heat transfer oil in the heat storage oil tank (5) is returned to the heat storage oil tank (5) through the heat transfer oil pump (7) and the oil heater (3), or the heat transfer oil in the heat storage oil tank (5) is returned to the heat storage oil tank (5) through the heat transfer oil pump (7), the heat transfer oil furnace body (1), and the oil heater (3).

2. The household miniature thermal oil heater system according to claim 1, characterized in that: The fuel for the micro thermal oil burner (2) is coal, biomass, oil or gas.

3. The household miniature thermal oil heater system according to claim 1, characterized in that: The external air preheater (12) adopts an indirect heat exchange method, and the heat exchange tubes of the external air preheater (12) are bare tubes, finned tubes or spiral groove tubes.

4. The household miniature thermal oil heater system according to claim 1, characterized in that: The economizer (15) adopts an indirect heat exchange method, and the heat exchange tubes of the economizer (15) are bare tubes, finned tubes or spiral groove tubes.

5. The household miniature thermal oil heater system according to claim 1, characterized in that: The oil heater (3) includes a heating unit (4). The heat transfer oil from the heat storage oil tank (5) is pumped into the heating unit (4) via the heat transfer oil pump (7) to serve as the heat source of the oil heater (3). The heat transfer oil from the heating unit (4) returns to the heat storage oil tank (5), thus forming a heat utilization loop of the heat storage heat transfer oil in the heat storage oil tank (5).

6. The household miniature thermal oil heater system according to claim 1, characterized in that: The oil heater (3) includes an oil-heated kettle, an oil-heated rice cooker, an oil-heated mini kitchen appliance, an oil-heated steamer, an oil-heated heater, and an oil-heated frying pan, all heated with heat-conducting oil.

7. The household miniature thermal oil heater system according to claim 1, characterized in that: The contact portion of the oil heater (3) and the heating unit (4) adopts the same structural design.

8. The household miniature thermal oil heater system according to claim 1, characterized in that: The oil heater (3) is connected to the heat utilization circuit in series, parallel or series-parallel manner.

9. The household miniature thermal oil heater system according to claim 1, characterized in that: The miniature thermal oil furnace adopts a thermal oil encapsulation process: after the assembled miniature thermal oil furnace and its oil circuit pipes, valves, and auxiliary facilities are purged, tested for air tightness, and tested for hydraulic pressure, the thermal oil in the assembled miniature thermal oil furnace is dehydrated and degassed in the manufacturing unit. After passing the dehydration and degassing process, the air remaining in the miniature thermal oil furnace is replaced with nitrogen, and then it is encapsulated and insulated; or the assembled miniature thermal oil furnace system is first replaced with nitrogen, and then dehydrated and degassed thermal oil is injected, encapsulated, and insulated.

10. The household miniature thermal oil heater system according to claim 1, characterized in that: The heat storage oil tank (5) in the micro heat-conducting oil furnace plays the role of oil-gas separation, buffering, heat storage and storage, and heat preservation measures are taken.

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