Organic heat carrier furnace

Abstract

The invention relates to an organic heat carrier furnace, which adopts fuel oil preheating, micro heat-conducting oil furnace waste heat recovery and absorption refrigerator cooling technologies, is beneficial to sufficient combustion of fuel oil of the organic heat carrier furnace and efficient recovery of flue gas waste heat, effectively avoids low-temperature corrosion of flue gas, realizes combined cooling and heating, and is flexible and convenient to operate and adjust. The novel combined cycle operation system of the organic heat carrier furnace is formed, the problem that waste heat of the organic heat carrier furnace is difficult to recycle is solved, and the combined cycle operation system has good economic and social significance in implementation and popularization.

Description

Technical Field

[0001] The invention belongs to the technical field of boilers, and in particular relates to an organic heat carrier furnace using high-temperature side heat-conducting oil furnace and micro heat-conducting oil furnace technology. Background Art

[0002] The oil-fired thermal oil boiler is a special boiler that uses fuel oil as fuel and an organic heat carrier, namely heat transfer oil, as the working medium. The high-temperature flue gas generated by the combustion of the fuel oil heats the heat transfer oil. After the temperature of the heat transfer oil is increased, it provides the required heat for the heat-using equipment. When the flue gas generated by the combustion of the fuel is discharged through the chimney, the temperature is generally around 230°C, and some are even as high as 300°C, which not only wastes heat but also causes thermal pollution to the environment.

[0003] Most of the oil-fired thermal oil furnaces do not recover waste heat or only add air preheaters to recover part of the flue gas waste heat, and the fuel oil is not preheated. Some processes are equipped with waste heat recovery devices with steam generators such as heat pipe boilers. For example, ZL200420027889.4 provides a waste heat recovery device for tail gas of a thermal oil furnace with a steam generator. This technology can reduce the exhaust temperature of the thermal oil furnace to about 160°C and recover a certain amount of steam. The preheating of the fuel oil helps to improve the full and complete combustion of the fuel oil.

[0004] However, if the user of the thermal oil boiler does not need the steam generated by the waste heat recovery process, or the steam load changes, the common phenomenon of venting excess steam from the evaporator will occur. The use of this type of technology is greatly restricted, and only the air preheater can be increased to recover part of the flue gas waste heat. In order to avoid low-temperature corrosion of the air preheater, the exhaust temperature of the boiler is usually above 160°C, and the overall thermal efficiency of the boiler is still low, which does not meet the requirements of energy saving and environmental protection.

[0005] Therefore, how to reasonably recycle and utilize the flue gas waste heat of the fuel oil thermal oil boiler, reduce the exhaust temperature, avoid low-temperature corrosion, and improve the overall thermal efficiency of the thermal oil boiler has become a hot topic in this field. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the above-mentioned prior art. The micro-thermal oil furnace technology is adopted to achieve full combustion of oil fuel and efficient recovery of flue gas waste heat, while effectively avoiding low-temperature corrosion of flue gas to the oil-gas heat exchanger, thereby achieving the purpose of energy saving and consumption reduction.

[0007] The purpose of the present invention is achieved by the following measures:

[0008] An organic heat carrier furnace, characterized in that the organic heat carrier furnace comprises a high-temperature side heat-conducting oil furnace and a low-temperature side micro heat-conducting oil furnace,

[0009] The high-temperature side thermal oil furnace comprises a thermal oil furnace body 1, a burner 2, a hot oil pump 7, a heat-using device 3, an oil-gas separator 5, a filter 6 and a connecting pipeline. The thermal oil is sequentially passed through the hot oil pump 7, the thermal oil furnace body 1, the heat-using device 3, the oil-gas separator 5, the filter 6 connected by the pipeline, and then returns to the hot oil pump 7. The high-temperature side thermal oil furnace is provided with a high-level expansion tank 4 and a low-level oil storage tank 8. The separated gas in the oil-gas separator 5 enters the high-level expansion tank 4. The high-level expansion tank 4 is connected to the low-level oil storage tank 8 through an overflow pipe.

[0010] The low-temperature side micro thermal oil furnace comprises a heat storage oil tank 11, a micro thermal oil pump 12, an oil and gas heater 13, a fuel oil heater 17 and connecting pipes thereof.

[0011] The oil-gas heater 13 is arranged on the flue 9 of the high-temperature side thermal oil furnace. The flue gas with a higher temperature in the flue 9 is discharged after the temperature is reduced by the oil-gas heater 13. The thermal oil drawn from the heat storage oil tank 11 absorbs the heat of the flue gas in the flue 9 through the micro thermal oil pump 12 and the oil-gas heater 13, and is sent to the fuel oil heater 17 to heat the fuel oil sent from the fuel oil tank 15 and the fuel oil pump 16. The fuel oil with increased temperature is sent to the burner 2 of the high-temperature side thermal oil furnace, mixed with the air sent by the blower 10 and burned, thereby forming an organic heat carrier furnace in a combined cycle operation mode of the high-temperature side thermal oil furnace and the low-temperature side micro thermal oil furnace.

[0012] The low-level oil storage tank 8 and the heat storage oil tank 11 can be integrated into one.

[0013] The oil-gas heater 13 and the flue gas adopt an indirect heat exchange method, and the hot air heated by the oil-gas heater 13 is sent to the thermal oil furnace 1 for use as combustion-supporting air.

[0014] The heat exchange tubes of the oil-gas heater 13 may be plain tubes, finned tubes, serpentine tubes or spiral grooved tubes.

[0015] The oil-gas heater 13 may be a shell and tube heat exchanger, a plate heat exchanger or other types of heat exchangers.

[0016] By controlling the oil inlet temperature of the oil-gas heater 13 (for example, above 90°C), low-temperature corrosion of the oil-gas heater 13 can be effectively avoided. Under the premise of avoiding condensation, the purpose of maximizing the use of flue gas waste heat can be achieved, so that the thermal oil furnace can operate economically and with high thermal efficiency, achieving the purpose of energy saving and consumption reduction.

[0017] An external air preheater 14 is provided: the heat transfer oil drawn from the heat storage oil tank 11 passes through a micro heat transfer oil pump 12 and an oil-gas heater 13, absorbs the heat of the flue gas in the flue 9, and is sent to the external air preheater 14 to heat the air sent by the blower 10, and then returns to the heat storage oil tank 11. The air sent by the blower 10 is heated by the external air preheater 14 and then sent to the burner 2 of the high-temperature side heat transfer oil furnace as combustion-supporting air.

[0018] With absorption chiller:

[0019] The absorption refrigerator comprises a generator 20, a condenser 24, a throttle valve F9, an evaporator 25, an absorber 22, and a solution pump 18;

[0020] The heat transfer oil from the oil-gas heater 13 is sent to the generator 20 to heat the concentrated solution of the refrigerant, and then returns to the thermal storage oil tank 11 through the oil return pipeline. The heat transfer oil in the thermal storage oil tank 11 is pressurized by the micro thermal oil pump 12 and then returns to the oil-gas heater 13, thereby forming a low-temperature heat utilization circulation loop of the heat transfer oil in the thermal storage oil tank 11;

[0021] The concentrated solution of the refrigerant pair formed in the absorber 22 is sent to the generator 20 through the solution pump 18, and is heated by the heat transfer oil in the generator 20 to produce a high-temperature gaseous refrigerant 23. The high-temperature gaseous refrigerant 23 is sent to the evaporator 25 through the condenser 24 and the throttle valve F10, and absorbs the heat of the cold medium sent by the cold unit 28. The low-temperature gaseous refrigerant 26 generated by evaporation in the evaporator 25 returns to the absorber 22, and contacts with the dilute solution of the refrigerant pair formed in the generator 20 sent from the throttle valve F9 to form a concentrated solution of the refrigerant pair. The concentrated solution of the refrigerant pair in the absorber 22 is then returned to the generator 20 through the solution pump 18, thereby forming a refrigerant circulation loop of the absorption refrigerator.

[0022] The cooling medium coming out of the cold unit 28 is pressurized by the cooling medium booster 29 and then sent to the evaporator 25 to absorb the cold released by the evaporation of the liquid refrigerant in the evaporator 25. The cooling medium with the absorbed cold and lowered temperature returns to the cold unit 28 for cooling. Alternatively, the cooling medium coming out of the cold unit 28 enters the evaporator 25 to absorb the cold released by the evaporation of the liquid refrigerant in the evaporator 25. The cooling medium with the absorbed cold and lowered temperature returns to the cold unit 28 for cooling, thereby forming a cooling medium circulation loop in which the cooling medium is charged with cold and then supplies cold to the cold unit 28.

[0023] The refrigeration unit 28 can be used in various forms, such as in offices or work places.

[0024] The cooling medium of the condenser 24 and the absorber 22 is air, water, sodium chloride in water liquid or ethylene glycol in water liquid, etc. The cooling medium 30 passing through the condenser 24 cools the high-temperature gaseous refrigerant 23, absorbs the heat of the high-temperature gaseous refrigerant 23, and the formed cooling medium 32 is discharged from the condenser outlet. The high-temperature gaseous refrigerant 23 condenses to form a liquid refrigerant and is sent to the evaporator 25.

[0025] In the absorber 22, the refrigerant pair dilute solution from the throttle valve F9 absorbs the low-temperature gaseous refrigerant 26 to form a refrigerant pair concentrated solution, and the released heat is removed by the cooling medium 30 to form the generator outlet cooling medium 31 to be discharged.

[0026] The absorption refrigerator selects a corresponding absorption refrigerator refrigerant pair, including but not limited to ammonia-water, ammonia-sodium thiocyanate solution, the refrigerant pair provided by CN202210567342.6 (dimethyl ether-ionic liquid refrigerant), the refrigerant pair provided by CN202211615323.2 (R134a-DMETG solution), or the refrigerant pair provided by CN202310535508.0 (ammonia-ionic liquid refrigerant).

[0027] The solution pump 18 includes an electrically driven liquid circulation pump or a naturally circulating bubble pump. The bubble pump actually uses the high head difference between the generator 20 and the absorber 22 and the buoyancy of the bubbles in the riser to drive the solution from the absorber 22 to the generator 20.

[0028] The cooling medium 30 of the condenser 24 is water or air, preferably water.

[0029] The cooling medium 30 of the absorber 22 is water or air, preferably water.

[0030] The cooling medium booster 29 is a fan when the cooling medium is gas, and is a liquid circulation pump when the cooling medium is water or solution.

[0031] The undescribed facilities in the organic heat carrier furnace are matched with reference to or in accordance with the reliable and mature technologies in the known organic heat carrier furnace.

[0032] Compared with the prior art, the present invention has the following advantages:

[0033] 1. Compared with the prior art, the present invention proposes a new type of organic heat carrier furnace, which adds a set of micro heat transfer oil furnace system on the basis of the traditional heat transfer oil furnace system to form a composite organic heat carrier furnace combined circulation operation system. The micro heat transfer oil furnace system is used to realize the internal circulation and efficient heat utilization of flue gas waste heat, and at the same time, the low-temperature corrosion of the oil and gas heater is effectively avoided. The flue gas emission temperature can reach about 130°C, which meets the requirements of energy saving and environmental protection;

[0034] 2. Compared with the prior art, the organic heat carrier furnace of the present invention uses a micro thermal oil furnace to drive an absorption refrigerator, which can provide cooling while providing high-temperature heating in the thermal oil furnace, replacing part or all of the cooling function of the original compression refrigeration unit to form a combined cooling and heating system;

[0035] 3. Compared with the prior art, the new organic heat carrier furnace of the present invention is flexible and convenient to operate and adjust, and can use the heat storage oil tank as a heat storage device to cope with changes in system load;

[0036] 4. Compared with the prior art, the organic heat carrier furnace of the present invention adopts fuel oil preheating technology, which is helpful for the ignition and full combustion of the fuel oil, and comprehensively improves the overall thermal efficiency of the organic heat carrier. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of an organic heat carrier furnace of the present invention.

[0038] Figure 1 In the figure, 1-heat transfer oil furnace body, 2-burner, 3-heat using equipment, 4-high-position expansion tank, 5-oil-gas separator, 6-filter, 7-hot oil pump, 8-low-position oil storage tank, 9-flue, 10-blower, 11-heat storage oil tank, 12-micro heat transfer oil pump, 13-oil-gas heater, 14-air preheater outside the furnace, 15-fuel oil tank, 16-fuel oil pump, 17-fuel oil heater, 18-solution pump, 19-concentrated solution pipeline, 20-generator, 21-dilute solution pipeline, 22-absorber, 23-high-temperature gaseous refrigerant, 24-condenser, 25-evaporator, 26-low-temperature gaseous refrigerant, 27-cooling medium pipeline, 28-cooling unit, 29-cooling medium booster, 30-cooling medium, 31-cooling medium at the outlet of the generator, 32-cooling medium at the outlet of the condenser, F9-throttle valve, F10-expansion valve. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1 The present invention is further described in detail with reference to the accompanying drawings and specific examples.

[0040] Embodiment 1:

[0041] An organic heat carrier furnace, comprising a high-temperature side heat transfer oil furnace and a low-temperature side micro heat transfer oil furnace,

[0042] The high-temperature side thermal oil furnace comprises a thermal oil furnace body 1, a burner 2, a hot oil pump 7, a heat-using device 3, an oil-gas separator 5, a filter 6 and a connecting pipeline. The thermal oil is sequentially passed through the hot oil pump 7, the thermal oil furnace body 1, the heat-using device 3, the oil-gas separator 5, the filter 6 connected by the pipeline, and then returns to the hot oil pump 7. The high-temperature side thermal oil furnace is provided with a high-level expansion tank 4 and a low-level oil storage tank 8. The separated gas in the oil-gas separator 5 enters the high-level expansion tank 4. The high-level expansion tank 4 is connected to the low-level oil storage tank 8 through an overflow pipe.

[0043] The low-temperature side micro thermal oil furnace comprises a heat storage oil tank 11, a micro thermal oil pump 12, an oil and gas heater 13, a fuel oil heater 17 and connecting pipes thereof.

[0044] The oil-gas heater 13 is arranged on the flue 9 of the high-temperature side thermal oil furnace. The flue gas with a higher temperature in the flue 9 is discharged after the temperature is reduced by the oil-gas heater 13. The thermal oil drawn from the heat storage oil tank 11 absorbs the heat of the flue gas in the flue 9 through the micro thermal oil pump 12 and the oil-gas heater 13, and is sent to the fuel oil heater 17 to heat the fuel oil sent from the fuel oil tank 15 and the fuel oil pump 16. The fuel oil with increased temperature is sent to the burner 2 of the high-temperature side thermal oil furnace, mixed with the air sent by the blower 10 and burned, thereby forming an organic heat carrier furnace in a combined cycle operation mode of the high-temperature side thermal oil furnace and the low-temperature side micro thermal oil furnace.

[0045] The low-level oil storage tank 8 and the heat storage oil tank 11 can be integrated into one.

[0046] The oil-gas heater 13 and the flue gas adopt an indirect heat exchange method, and the hot air heated by the oil-gas heater 13 is sent to the thermal oil furnace 1 for use as combustion-supporting air.

[0047] The heat exchange tubes of the oil-gas heater 13 may be plain tubes, finned tubes, serpentine tubes or spiral grooved tubes.

[0048] The oil-gas heater 13 may be a shell and tube heat exchanger, a plate heat exchanger or other types of heat exchangers.

[0049] By controlling the oil inlet temperature of the oil-gas heater 13 (for example, above 90°C), low-temperature corrosion of the oil-gas heater 13 can be effectively avoided. Under the premise of avoiding condensation, the purpose of maximizing the use of flue gas waste heat can be achieved, so that the thermal oil furnace can operate economically and with high thermal efficiency, achieving the purpose of energy saving and consumption reduction.

[0050] An external air preheater 14 is provided: the heat transfer oil drawn from the heat storage oil tank 11 passes through a micro heat transfer oil pump 12 and an oil-gas heater 13, absorbs the heat of the flue gas in the flue 9, and is sent to the external air preheater 14 to heat the air sent by the blower 10, and then returns to the heat storage oil tank 11. The air sent by the blower 10 is heated by the external air preheater 14 and then sent to the burner 2 of the high-temperature side heat transfer oil furnace as combustion-supporting air.

[0051] With absorption chiller:

[0052] The absorption refrigerator comprises a generator 20, a condenser 24, a throttle valve F9, an evaporator 25, an absorber 22, and a solution pump 18;

[0053] The heat transfer oil from the oil-gas heater 13 is sent to the generator 20 to heat the concentrated solution of the refrigerant, and then returns to the thermal storage oil tank 11 through the oil return pipeline. The heat transfer oil in the thermal storage oil tank 11 is pressurized by the micro thermal oil pump 12 and then returns to the oil-gas heater 13, thereby forming a low-temperature heat utilization circulation loop of the heat transfer oil in the thermal storage oil tank 11;

[0054] The concentrated solution of the refrigerant pair formed in the absorber 22 is sent to the generator 20 through the solution pump 18 and the concentrated solution pipeline 19, and is heated by the heat transfer oil in the generator 20 to produce a high-temperature gaseous refrigerant 23. The high-temperature gaseous refrigerant 23 is sent to the evaporator 25 through the condenser 24 and the throttle valve F10, and absorbs the heat of the cold medium sent by the cold unit 28. The low-temperature gaseous refrigerant 26 generated by evaporation in the evaporator 25 returns to the absorber 22, and contacts with the dilute solution of the refrigerant pair formed in the generator 20 sent from the throttle valve F9 and the dilute solution pipeline 21 to form a concentrated solution of the refrigerant pair. The concentrated solution of the refrigerant pair in the absorber 22 is then returned to the generator 20 through the solution pump 18, thereby forming a refrigerant circulation loop of the absorption refrigerator.

[0055] The cooling medium coming out of the cooling unit 28 is pressurized by the cooling medium booster 29 and then sent to the evaporator 25 to absorb the cold released by the evaporation of the liquid refrigerant in the evaporator 25. The cooling medium that has absorbed the cold and has lowered its temperature returns to the cooling unit 28 through the cooling medium pipeline 27 for cooling. Alternatively, the cooling medium coming out of the cooling unit 28 enters the evaporator 25 to absorb the cold released by the evaporation of the liquid refrigerant in the evaporator 25. The cooling medium that has absorbed the cold and has lowered its temperature returns to the cooling unit 28 through the cooling medium pipeline 27 for cooling, thereby forming a cooling medium circulation loop in which the cooling medium is charged with cold and then supplies cold to the cooling unit 28.

[0056] The refrigeration unit 28 can be used in various forms, such as in offices or work places.

[0057] The cooling medium of the condenser 24 and the absorber 22 is air, water, sodium chloride in water liquid or ethylene glycol in water liquid, etc. The cooling medium 30 passing through the condenser 24 cools the high-temperature gaseous refrigerant 23, absorbs the heat of the high-temperature gaseous refrigerant 23, and the formed cooling medium 32 is discharged from the condenser outlet. The high-temperature gaseous refrigerant 23 condenses to form a liquid refrigerant and is sent to the evaporator 25.

[0058] In the absorber 22, the refrigerant pair dilute solution from the throttle valve F9 absorbs the low-temperature gaseous refrigerant 26 to form a refrigerant pair concentrated solution, and the released heat is removed by the cooling medium 30 to form the generator outlet cooling medium 31 to be discharged.

[0059] The absorption refrigerator selects ammonia-water as the refrigerant pair.

[0060] The solution pump 18 is an electrically driven liquid circulation pump that drives the solution from the absorber 22 to the generator 20 .

[0061] The cooling medium 30 of the condenser 24 is water or air, preferably water.

[0062] The cooling medium 30 of the absorber 22 is water or air, preferably water.

[0063] The cooling medium booster 29 is a fan when the cooling medium is gas, and is a liquid circulation pump when the cooling medium is water or solution.

[0064] The undescribed facilities in the organic heat carrier furnace are matched with reference to or according to the reliable and mature technologies in the known existing organic heat carrier furnaces.

[0065] Although the present invention has been disclosed as above with preferred embodiments, they are not intended to limit the present invention. Anyone familiar with the art can make various changes or modifications without departing from the spirit and scope of the present invention, which also belong to the protection scope of the present invention. For example, the present invention can use heat transfer oil to recover waste heat, preheat air, and form a closed-loop circulation of heat transfer oil, which can also achieve efficient recovery of flue gas waste heat. Therefore, the protection scope of the present invention shall be based on the definition of the claims of this application.

Claims

1. An organic heat carrier furnace, characterized in that: The organic heat carrier furnace system includes a high-temperature side heat transfer oil furnace and a low-temperature side micro heat transfer oil furnace. The high-temperature side thermal oil furnace comprises a thermal oil furnace body (1), a burner (2), a hot oil pump (7), a heat-using device (3), an oil-gas separator (5) and connecting pipelines. The thermal oil passes through the hot oil pump (7), the thermal oil furnace body (1), the heat-using device (3), the oil-gas separator (5) connected by the pipelines in sequence, and then returns to the hot oil pump (7). The high-temperature side thermal oil furnace is provided with a high-position expansion tank (4) and a low-position oil storage tank (8). The gas separated in the oil-gas separator (5) enters the high-position expansion tank (4). The high-position expansion tank (4) is connected to the low-position oil storage tank (8) through an overflow pipe. The low-temperature side micro thermal oil furnace comprises a heat storage oil tank (11), a micro thermal oil pump (12), an oil and gas heater (13), an air preheater outside the furnace (14) and connecting pipes thereof, The oil-gas heater (13) is arranged on the flue (9) of the high-temperature side thermal oil furnace. The flue gas with a relatively high temperature in the flue (9) is discharged after its temperature is reduced by the oil-gas heater (13). The thermal oil drawn from the thermal storage oil tank (11) passes through the micro thermal oil pump (12) and the oil-gas heater (13), absorbs the heat of the flue gas in the flue (9), and is sent to the fuel oil heater (17) to heat the fuel oil sent from the fuel oil tank (15) and the fuel oil pump (16). The fuel oil with a raised temperature is sent to the burner 2 of the high-temperature side thermal oil furnace, mixed with the air sent by the blower 10 and burned, and then returned to the thermal storage oil tank (11), thereby forming an organic heat carrier furnace in a combined cycle operation mode of the high-temperature side thermal oil furnace and the low-temperature side micro thermal oil furnace.

2. The organic heat carrier furnace according to claim 1, characterized in that: The low-level oil storage tank (8) and the heat storage oil tank (11) are integrated into one.

3. The organic heat carrier furnace according to claim 1, characterized in that: With absorption chiller: The absorption refrigerator comprises a generator (20), a condenser (24), a throttle valve F9, an evaporator (25), an absorber (22), and a solution pump (18); The heat transfer oil from the oil-gas heater (13) is sent to the generator (20) to heat the concentrated solution of the refrigerant, and then returns to the heat storage oil tank (11) through the oil return pipeline. The heat transfer oil in the heat storage oil tank (11) is pressurized by the micro heat transfer oil pump (12) and then returns to the oil-gas heater (13), thereby forming a low-temperature heat utilization circulation loop of the heat transfer oil in the heat storage oil tank (11); The concentrated solution of the refrigerant pair formed in the absorber (22) is sent to the generator (20) via the solution pump (18), and is heated by the heat transfer oil in the generator (20) to generate a high-temperature gaseous refrigerant (23). The high-temperature gaseous refrigerant (23) is sent to the evaporator (25) via the condenser (24) and the throttle valve F10, and absorbs the heat of the cooling medium sent by the cooling unit (28). The low-temperature gaseous refrigerant (26) generated by evaporation in the evaporator (25) returns to the absorber (22), and contacts with the dilute solution of the refrigerant pair formed in the generator (20) sent from the throttle valve F9 to form a concentrated solution of the refrigerant pair. The concentrated solution of the refrigerant pair in the absorber (22) is then returned to the generator (20) via the solution pump (28), thereby forming a refrigerant pair circulation loop of the absorption refrigerator. The cooling medium from the cold unit (28) is pressurized by the cooling medium booster (29) and then sent to the evaporator (25) to absorb the cold released by the evaporation of the liquid refrigerant in the evaporator (25). The cooling medium that has absorbed the cold and has a lowered temperature returns to the cold unit (28) for cooling. Alternatively, the cooling medium from the cold unit (28) enters the evaporator (25) to absorb the cold released by the evaporation of the liquid refrigerant in the evaporator (25). The cooling medium that has absorbed the cold and has a lowered temperature returns to the cold unit (28) for cooling. Thus, a cooling medium circulation loop is formed in which the cooling medium is charged with cold and then supplies cold to the cold unit (28).

4. The organic heat carrier furnace according to claim 1, characterized in that: The oil-gas heater (13) is a shell and tube heat exchanger, a plate heat exchanger or other types of heat exchangers.

5. The organic heat carrier furnace according to claim 3, characterized in that: The refrigerant pair selected by the absorption refrigerator includes ammonia-water, ammonia-sodium thiocyanate solution, dimethyl ether-ionic liquid refrigerant, R134a-DMETG solution or ammonia-ionic liquid refrigerant.

6. The organic heat carrier furnace according to claim 3, characterized in that: The solution pump (18) comprises an electrically driven liquid circulation pump or a naturally circulating bubble pump.

7. The organic heat carrier furnace according to claim 1, characterized in that: The burner (2) of the high-temperature side thermal oil furnace uses coal, oil or gas as fuel.

8. The organic heat carrier furnace according to claim 1, characterized in that: An external air preheater (14) is provided: the heat transfer oil drawn from the heat storage oil tank (11) passes through a micro heat transfer oil pump (12) and an oil-gas heater (13), absorbs the heat of the flue gas in the flue (9), is sent to the external air preheater (14) to heat the air sent by the blower (10), and then returns to the heat storage oil tank (11). The air sent by the blower (10) is heated by the external air preheater (14) and then sent to the burner (2) of the high-temperature side heat transfer oil furnace as combustion air.

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