Cascade type organic heat carrier furnace

Abstract

The utility model relates to a cascade type organic heat carrier furnace, which adopts a micro heat-conducting oil furnace system to recover flue gas waste heat, effectively avoids low-temperature corrosion of flue gas, realizes efficient recovery and utilization of the flue gas waste heat, realizes combined supply of cold and heat, is flexible and convenient to operate and adjust, and forms a novel cascade type organic heat carrier furnace combined cycle operation system. The problem that waste heat of the organic heat carrier furnace is difficult to recycle is solved, and the organic heat carrier furnace has good economic and social significance in implementation and popularization.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of boiler, and particularly relates to a cascade organic heat carrier furnace adopting micro heat conducting oil furnace technology. BACKGROUND

[0002] The heat conducting oil furnace is a special boiler taking organic heat carrier, i.e., heat conducting oil, as working medium, and the heat conducting oil is heated by high-temperature flue gas generated by fuel combustion, and the heat conducting oil provides required heat for heat-using equipment after temperature rising, and the flue gas generated after fuel combustion is discharged through a chimney, and the temperature is generally about 230 DEG C, and some even as high as 300 DEG C, which not only wastes heat, but also causes thermal pollution to the environment.

[0003] Most of the heat conducting oil furnaces do not recover waste heat or only recover part of waste heat of flue gas by adding an air preheater, and some processes are provided with waste heat recovery devices with steam generators, such as heat pipe boilers, for example, the heat conducting oil furnace tail gas waste heat recovery device with a steam generator provided in ZL200420027889.4, which can reduce the flue gas discharge temperature of the heat conducting oil furnace to about 160 DEG C and recover a certain amount of steam.

[0004] However, if the steam generated by the waste heat recovery process is not needed by the heat conducting oil furnace using unit or the steam load changes, the common phenomenon of steam generator excess steam venting occurs, and the use of such technology is greatly limited, and only the air preheater can be added to recover part of the waste heat of flue gas, in order to avoid low-temperature corrosion of the air preheater, the flue gas discharge temperature of the boiler is generally above 160 DEG C, and the overall thermal efficiency of the boiler is still low, which does not meet the energy saving and environmental protection requirements.

[0005] Therefore, how to reasonably recover and utilize the waste heat of flue gas of the organic heat carrier furnace, reduce the flue gas discharge temperature, avoid low-temperature corrosion, and improve the overall thermal efficiency of the organic heat carrier furnace has become a research focus in the field. UTILITY MODEL CONTENTS

[0006] The utility model discloses a purpose to solve the shortcomings of the prior art, adopt micro heat conducting oil furnace system, realize the efficient recovery of the waste heat of flue gas of the organic heat carrier furnace, and effectively avoid the low-temperature corrosion of flue gas to the oil-gas heat exchanger, so that the purpose of energy saving and consumption reduction is achieved.

[0007] The utility model discloses a purpose to solve the shortcomings of the prior art, adopt micro heat conducting oil furnace system, realize the efficient recovery of the waste heat of flue gas of the organic heat carrier furnace, and effectively avoid the low-temperature corrosion of flue gas to the oil-gas heat exchanger, so that the purpose of energy saving and consumption reduction is achieved.

[0008] A cascade organic heat carrier furnace, characterized by comprising a high-temperature side heat conducting oil furnace and a low-temperature side micro heat conducting oil furnace,

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

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

[0011] The oil gas heater 13 is arranged on a flue 9 of the high-temperature side heat conducting oil furnace, the flue 9 is used for discharging flue gas with a high temperature, the flue gas is discharged after the temperature thereof is reduced through the oil gas heater 13, the heat conducting oil drawn from the heat accumulating oil tank 11 absorbs the heat of the flue gas in the flue 9 through the micro heat conducting oil pump 12 and the oil gas heater 13, is sent into an air preheater 14 outside the furnace to heat the air sent by an air blower 10, and is returned to the heat accumulating oil tank 11, the air sent by the air blower 10 is heated through the air preheater 14 outside the furnace, is then sent to the burner 2 of the high-temperature side heat conducting oil furnace as combustion-supporting air, and thus a new type of organic heat carrier furnace in a combined cycle operation mode of the high-temperature side heat conducting oil furnace and the low-temperature side micro heat conducting oil furnace is formed.

[0012] The low-position oil storage tank 8 and the heat accumulating oil tank 11 can be combined into one.

[0013] The burner 2 of the high-temperature side heat conducting oil furnace adopts coal, oil or gas as fuel.

[0014] The oil gas heater 13 and the flue gas adopt an indirect heat exchange mode, the hot air heated through the oil gas heater 13 is sent into the heat conducting oil furnace 1 as combustion-supporting air.

[0015] The heat exchange pipe of the oil gas heater 13 can adopt a light pipe, a finned pipe, a serpentine pipe or a spiral groove pipe.

[0016] The oil gas heater 13 can be a tube-shell type heat exchanger, a plate type heat exchanger or other types of heat exchanger.

[0017] Controlling the oil temperature (for example, above 90℃) of the oil gas heater 13 can effectively avoid low-temperature corrosion of the oil gas heater 13, and under the premise of avoiding dewing, the purpose of maximum utilization of waste heat of the flue gas is achieved, the heat conducting oil furnace can be operated economically and with high heat efficiency, and the purpose of energy saving and consumption reduction is achieved.

[0018] An absorption type refrigerator is arranged,

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

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

[0022] The heat transfer medium from the cooling unit 28 is pressurized by the heat transfer medium pressurizer 29, and is then sent to the evaporator 25 to absorb the cold energy released by the evaporation of the liquid refrigerant in the evaporator 25. The heat transfer medium absorbing the cold energy and being lowered in temperature is returned to the cooling unit 28 to supply cold. Alternatively, the heat transfer medium from the cooling unit 28 enters the evaporator 25 to absorb the cold energy released by the evaporation of the liquid refrigerant in the evaporator 25. The heat transfer medium absorbing the cold energy and being lowered in temperature is pressurized by the heat transfer medium pressurizer 29, and is then returned to the cooling unit 28 to supply cold, thereby forming a heat transfer medium circulation loop of the heat transfer medium charging cold and resupplying cold to the cooling unit 28.

[0023] The cooling unit 28 has various types of use, such as office or work site.

[0024] The cooling medium of the condenser 24 and the absorber 22 is air, water, sodium chloride aqueous solution or ethylene glycol aqueous solution, etc. The cooling medium 30 passing through the condenser 24 cools and absorbs the heat of the high-temperature gaseous refrigerant 23, and the condenser outlet cooling medium 32 is discharged. The high-temperature gaseous refrigerant 23 is condensed to form the liquid refrigerant, which 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 the refrigerant pair concentrated solution. The released heat is removed by the cooling medium 30, and the generator outlet cooling medium 31 is discharged.

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

[0027] The solution pump 18 includes an electrically driven liquid circulating pump or a natural circulation bubble pump, wherein the bubble pump substantially utilizes the high pressure 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] When the cooling medium is gas, the cooling medium booster 29 is a fan; when the cooling medium is water or solution, the cooling medium booster 29 is a liquid circulating pump.

[0031] The heat exchanger 15 is provided:

[0032] The heat-conducting oil from the oil-gas heater 13 is sent to the heat exchanger 15 to heat the refrigerant medium 16, and then returned to the heat storage oil tank 11 through the oil return pipeline; the heat-conducting oil in the heat storage oil tank 11 is pressurized by the micro heat-conducting oil pump 12 and then returned to the oil-gas heater 13, thereby forming a low-temperature heat utilization circulating loop of the heat-conducting oil in the heat storage oil tank 11; the refrigerant medium 16 heated by the heat exchanger 15 forms the heat medium 17 for subsequent sections.

[0033] The unexplained facilities in the cascade organic heat carrier furnace refer to or are matched according to reliable and mature technologies in the known organic heat carrier furnace.

[0034] Compared with the prior art, the utility model has the following advantages:

[0035] 1. Compared with the prior art, the utility model provides a novel cascade organic heat carrier furnace, which adds a micro heat-conducting oil furnace system on the basis of a traditional heat-conducting oil furnace system, forms a cascade organic heat carrier furnace combined cycle operation system, realizes internal circulation efficient heat utilization of flue gas waste heat by using the micro heat-conducting oil furnace system, and effectively avoids low-temperature corrosion of the oil-gas heater, wherein the flue gas discharge temperature can reach about 130 DEG C, meeting the energy saving and environmental protection requirements.

[0036] 2. Compared with the prior art, the cascade organic heat carrier furnace of this utility model uses a micro thermal oil furnace to drive an absorption chiller, so that while the thermal oil furnace provides high-temperature heating, it can also provide cooling, thus replacing part or all of the cooling function of the original compression refrigeration unit and forming a combined cooling and heating system.

[0037] 3. Compared with the prior art, the cascade organic heat carrier furnace of this utility model 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. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure and process of a cascaded organic heat carrier furnace according to this utility model.

[0039] Figure 1 In the diagram, 1-heat transfer oil furnace body, 2-burner, 3-heat-using equipment, 4-high-level expansion tank, 5-oil-gas separator, 6-filter, 7-hot oil pump, 8-low-level oil storage tank, 9-flue, 10-blower, 11-heat storage oil tank, 12-micro heat transfer oil pump, 13-oil-gas heater, 14-external air preheater, 15-heat exchanger, 16-cold medium, 17-heat medium, 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-generator outlet cooling medium, 32-condenser outlet cooling medium, F9-throttle valve, F10-expansion valve. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1 The present invention will be further described in detail with reference to specific embodiments.

[0041] Example 1:

[0042] A cascaded organic heat carrier furnace, characterized in that the cascaded organic heat carrier furnace system includes a high-temperature side thermal oil furnace and a low-temperature side micro thermal oil furnace.

[0043] The high-temperature side thermal oil heater includes a thermal oil heater body 1, a burner 2, a hot oil pump 7, a heat-using device 3, an oil-gas separator 5, a filter 6, and connecting pipelines. The thermal oil flows sequentially through the pipelines connected to the hot oil pump 7, the thermal oil heater body 1, the heat-using device 3, the oil-gas separator 5, and the filter 6, returning to the hot oil pump 7. The high-temperature side thermal oil heater is equipped with a high-level expansion tank 4 and a low-level oil storage tank 8. The gas separated from the oil-gas separator 5 enters the high-level expansion tank 4, and the high-level expansion tank 4 is connected to the low-level oil storage tank 8 through an overflow pipe.

[0044] The low-temperature side micro heat-conducting oil furnace comprises a heat storage oil tank 11, a micro heat-conducting oil pump 12, an oil-gas heater 13, a fuel oil heater 17 and connecting pipelines thereof,

[0045] The oil-gas heater 13 is arranged on the flue 9 of the high-temperature side heat-conducting oil furnace, the high-temperature flue gas in the flue 9 is discharged after being reduced in temperature by the oil-gas heater 13, and the heat-conducting oil led out from the heat storage oil tank 11 is heated by the micro heat-conducting oil pump 12 and the oil-gas heater 13 to absorb the heat of the flue gas in the flue 9, and then is sent to the air preheater 14 outside the furnace to heat the air sent by the air blower 10, and then is returned to the heat storage oil tank 11, so that the air sent by the air blower 10 is heated by the air preheater 14 outside the furnace and then is sent to the heating source 2 of the heat-conducting oil furnace 1 as combustion-supporting air, thereby forming a new type of organic heat carrier furnace in a combined cycle operation mode of the high-temperature side heat-conducting oil furnace and the low-temperature side micro heat-conducting oil furnace.

[0046] The burner 2 of the high-temperature side heat-conducting oil furnace uses coal, oil or gas as fuel.

[0047] The oil-gas heater 13 uses an indirect heat exchange mode with flue gas, and the hot air heated by the oil-gas heater 13 is sent to the heat-conducting oil furnace 1 as combustion-supporting air.

[0048] The heat exchange pipe of the oil-gas heater 13 can be a light pipe, a finned pipe, a serpentine pipe or a spiral groove pipe.

[0049] The oil-gas heater 13 can be a tube-shell type heat exchanger, a plate type heat exchanger or other types of heat exchangers.

[0050] Controlling the oil inlet temperature of the oil-gas heater 13 (for example, above 90℃) can effectively avoid low-temperature corrosion of the oil-gas heater 13, and under the premise of avoiding dewing, the purpose of maximum utilization of waste heat of flue gas is achieved, so that the heat-conducting oil furnace can be operated economically and with high thermal efficiency, and the purpose of energy saving and consumption reduction is achieved.

[0051] An absorption type refrigerator is arranged,

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

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

[0054] The refrigerant pair concentrated solution formed in the absorber 22 is sent to the generator 20 through the solution pump 18 and the concentrated solution pipeline 19, and high-temperature gaseous refrigerant 23 is generated by heating in the generator 20. The high-temperature gaseous refrigerant 23 is sent to the evaporator 25 through the condenser 24 and the throttling valve F10, absorbs the heat of the cooling medium sent by the cooling unit 28, and evaporates to generate low-temperature gaseous refrigerant 26 which returns to the absorber 22. The refrigerant pair dilute solution from the throttling valve F9 and the dilute solution pipeline 21 contacts the low-temperature gaseous refrigerant 26 in the generator 20 to form the refrigerant pair concentrated solution, and the refrigerant pair concentrated solution in the absorber 22 returns to the generator 20 through the solution pump 18, thereby forming a refrigerant circulation loop of the absorption refrigerator,

[0055] The cooling medium from the cooling unit 28 is pressurized by the cooling medium booster 29 and then sent to the evaporator 25 to absorb the cold energy released by the liquid refrigerant in the evaporator 25. The cooling medium which absorbs the cold energy and is lowered in temperature returns to the cooling unit 28 through the cooling medium pipeline 27 to provide cooling, or the cooling medium from the cooling unit 28 enters the evaporator 25 to absorb the cold energy released by the liquid refrigerant in the evaporator 25. The cooling medium which absorbs the cold energy and is lowered in temperature is pressurized by the cooling medium booster 29 and then returns to the cooling unit 28 through the cooling medium pipeline 27 to provide cooling, thereby forming a cooling medium circulation loop of the cooling medium which is cooled and then provides cooling to the cooling unit 28.

[0056] The cooling unit 28 can have various types of usage, such as office or work site.

[0057] The cooling medium of the condenser 24 and the absorber 22 can be air, water, sodium chloride aqueous solution, or ethylene glycol aqueous solution. The cooling medium 30 passing through the condenser 24 cools and absorbs the heat of the high-temperature gaseous refrigerant 23, and the generated condenser outlet cooling medium 32 is discharged. The high-temperature gaseous refrigerant 23 is condensed to form liquid refrigerant which is sent to the evaporator 25,

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

[0059] The absorption refrigerator can use an ammonia-water refrigerant pair.

[0060] The solution pump 18 is a liquid circulation pump driven by electricity to send the solution from the absorber 22 to the generator 20.

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

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

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

[0064] The heat exchanger 15 is provided with:

[0065] The heat conducting oil from the oil gas heater 13 is sent to the heat exchanger 15 to heat the cold medium 16, and then returns to the heat storage oil tank 11 through the oil return pipeline. The heat conducting oil in the heat storage oil tank 11 is pressurized by the micro heat conducting oil pump 12, and then returns to the oil gas heater 13, thereby forming a low-temperature heat utilization circulating loop of the heat conducting oil in the heat storage oil tank 11. The cold medium 16 heated by the heat exchanger 15 forms the hot medium 17 for use in the subsequent section.

[0066] The unexplained facilities in the cascade organic heat carrier furnace refer to or are matched according to the reliable and mature technology in the known organic heat carrier furnace.

[0067] Although the utility model has disclosed as above with preferred embodiments, they are not intended to limit the utility model, and any person skilled in the art can make various changes or modifications without departing from the spirit and scope of the utility model, which also belongs to the protection scope of the utility model. For example, the utility model can utilize the heat conducting oil to recover waste heat, preheat air, and form a closed loop circulation of the heat conducting oil, which can also realize efficient recovery of flue gas waste heat. Therefore, the protection scope of the utility model should be defined by the claims of the present application.

Claims

1. A cascade organic heat carrier furnace, characterized in that: the cascade organic heat carrier furnace system comprises a high-temperature side heat conducting oil furnace and a low-temperature side micro heat conducting oil furnace, the high-temperature side heat conducting oil furnace comprises a heat conducting oil furnace body (1), a burner (2), a heat oil pump (7), a heat using equipment (3), an oil gas separator (5) and connecting pipelines, heat conducting oil passes through the heat oil pump (7), the heat conducting oil furnace body (1), the heat using equipment (3) and the oil gas separator (5) in sequence, and returns to the heat oil pump (7), the high-temperature side heat conducting oil furnace is provided with a high-position expansion tank (4) and a low-position oil storage tank (8), the separated gas in the oil gas separator (5) enters the high-position expansion tank (4), and the high-position expansion tank (4) is connected with the low-position oil storage tank (8) through an overflow pipe, the low-temperature side micro heat conducting oil furnace comprises a heat accumulating oil tank (11), a micro heat conducting oil pump (12), an oil gas heater (13), an out-of-furnace air preheater (14) and connecting pipelines thereof, the oil gas heater (13) is arranged on a flue (9) of the high-temperature side heat conducting oil furnace, flue gas with a high temperature in the flue (9) is discharged after the temperature thereof is reduced by the oil gas heater (13), heat conducting oil led out from the heat accumulating oil tank (11) absorbs heat of the flue gas in the flue (9) through the micro heat conducting oil pump (12) and the oil gas heater (13), is sent into the out-of-furnace air preheater (14) to heat air sent by an air blower (10), and returns to the heat accumulating oil tank (11), air sent by the air blower (10) is heated by the out-of-furnace air preheater (14) and then is delivered to the burner (2) of the high-temperature side heat conducting oil furnace as combustion supporting air, so that a new type of organic heat carrier furnace in a combined cycle operation mode of the high-temperature side heat conducting oil furnace and the low-temperature side micro heat conducting oil furnace is formed.

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

3. The cascade organic heat carrier furnace according to claim 1, characterized in that: an absorption type refrigerator is arranged, the absorption type refrigerator comprises a generator (20), a condenser (24), a throttling valve F9, an evaporator (25), an absorber (22) and a solution pump (18), heat conducting oil led out from the oil gas heater (13) is sent into the generator (20) to heat a concentrated solution of a refrigerant pair, and then returns to the heat accumulating oil tank (11) through an oil return pipeline, heat conducting oil in the heat accumulating oil tank (11) is pressurized by the micro heat conducting oil pump (12) and then returns to the oil gas heater (13), so that a low-temperature heat utilization circulation loop of the heat conducting oil in the heat accumulating oil tank (11) is formed. ​ ​ ​ ​ ​ ​ ​ ​ The refrigerant pair concentrated solution formed in the absorber (22) is sent to the generator (20) by the solution pump (18), and high-temperature gaseous refrigerant (23) is generated by heating in the generator (20) by the heat conduction oil. The high-temperature gaseous refrigerant (23) is sent to the evaporator (25) through the condenser (24) and the expansion valve F10, absorbs the heat of the cooling medium sent by the absorption cooling unit (28), and evaporates to generate low-temperature gaseous refrigerant (26) in the evaporator (25). The low-temperature gaseous refrigerant (26) returns to the absorber (22) and contacts with the refrigerant pair dilute solution sent from the throttling valve F9 in the generator (20), to form the refrigerant pair concentrated solution. The refrigerant pair concentrated solution in the absorber (22) returns to the generator (20) by the solution pump (18) again, thereby forming the refrigerant pair circulation loop of the absorption refrigerator, The cooling medium from the cooling unit (28) is pressurized by the cooling medium booster (29) and then sent to the evaporator (25) to absorb the cold energy released by the evaporation of the liquid refrigerant in the evaporator (25). The cooling medium which absorbs the cold energy and is lowered in temperature returns to the cooling unit (28) for cooling supply, or the cooling medium from the cooling unit (28) enters the evaporator (25) to absorb the cold energy released by the evaporation of the liquid refrigerant, and the cooling medium which absorbs the cold energy and is lowered in temperature is pressurized by the cooling medium booster (29) and then returns to the cooling unit (28) for cooling supply, thereby forming the cooling medium circulation loop of the cooling medium which is cooled and then supplied to the cooling unit (28).

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

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

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

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

8. The cascade organic heat carrier furnace according to claim 1, characterized in that: The heat exchanger (15) is provided: The heat conduction oil from the oil-gas heater (13) is sent to the heat exchanger (15) to heat the refrigerant medium (16), and then returns to the heat storage oil tank (11) through the oil return pipeline. The heat conduction oil in the heat storage oil tank (11) is pressurized by the micro heat conduction oil pump (12) and then returns to the oil-gas heater (13), thereby forming the low-temperature heat utilization circulation loop of the heat conduction oil in the heat storage oil tank (11). The refrigerant medium (16) heated by the heat exchanger (15) forms the heat medium (17) for use in subsequent sections.

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