Combined heat and power generation system of organic heat carrier furnace

Abstract

The utility model relates to a combined heat and power generation system of an organic heat carrier furnace, which adopts a micro heat-conducting oil furnace system to recover flue gas waste heat and an organic Rankine cycle unit to realize thermal power generation of the flue gas waste heat, effectively avoids low-temperature corrosion of flue gas, realizes high-efficiency recovery and utilization of the flue gas waste heat and combined heat and power generation, and is flexible and convenient to operate and adjust. The problems that waste heat of the organic heat carrier furnace is difficult to recycle, and energy-quality matching and utilization are difficult are solved, and implementation and popularization of the organic heat carrier furnace have good economic and social significance.

Description

TECHNICAL FIELD

[0001] The utility model belongs to boiler technical field, especially relates to a kind of organic heat carrier furnace cogeneration system using micro heat conducting oil furnace and organic rankine cycle power generation technology. BACKGROUND

[0002] Organic heat carrier furnace is a kind of special boiler with organic heat carrier as working medium, and the high-temperature flue gas generated by fuel combustion heats the organic heat carrier, i.e., heat conducting oil, and the heat conducting oil provides the required heat for heat-using equipment after temperature rise, while the flue gas generated after fuel combustion is discharged through chimney, and the flue gas temperature is related to the inlet temperature of heat conducting oil, and the flue gas temperature is generally higher than 230℃, and some even as high as 350℃, which not only wastes heat, but also causes thermal pollution to the environment.

[0003] Most heat conducting oil furnaces do not recover waste heat or only recover part of flue gas waste heat by adding air preheater, and some processes are provided with waste heat recovery devices with steam generator, such as heat pipe boiler, for example, ZL200420027889.4 provides a heat conducting oil furnace tail gas waste heat recovery device with steam generator, which recovers a certain amount of steam.

[0004] At present, the patents for heat and power cogeneration of heat conducting oil furnace or organic heat carrier furnace proposed in China are CN201110088264.3-System and method for realizing heat and power cogeneration by utilizing heat conducting oil furnace and semiconductor power generation device, and CN201110088266.2-System and method for realizing heat and power cogeneration of heat conducting oil furnace by utilizing semiconductor power generation device, which realizes heat and power cogeneration by combining semiconductor power generation device with heat conducting oil furnace, and is theoretically feasible but difficult to implement.

[0005] Therefore, how to reasonably recover flue gas waste heat of organic heat carrier furnace by utilizing organic rankine cycle power generation technology, effectively avoid low-temperature corrosion, realize heat and power cogeneration of organic heat carrier furnace, and improve the overall thermal efficiency of organic heat carrier furnace become the difficulties in the field. Utility model content

[0006] The utility model aims at solving the above-mentioned shortcomings of prior art, and realizes efficient recovery of flue gas waste heat of organic heat carrier furnace by utilizing organic rankine cycle power generation technology, effectively avoids low-temperature corrosion of flue gas to oil-gas heat exchanger, realizes heat and power cogeneration of organic heat carrier furnace, and achieves the purpose of energy saving and consumption reduction.

[0007] The utility model aims at solving the above-mentioned shortcomings of prior art, and realizes efficient recovery of flue gas waste heat of organic heat carrier furnace by utilizing organic rankine cycle power generation technology, effectively avoids low-temperature corrosion of flue gas to oil-gas heat exchanger, realizes heat and power cogeneration of organic heat carrier furnace, and achieves the purpose of energy saving and consumption reduction.

[0008] The application discloses an organic heat carrier furnace combined heat and power system, which comprises a high-temperature side heat conducting oil furnace, a low-temperature side micro heat conducting oil furnace and an organic Rankine cycle device.

[0009] The high-temperature side heat conducting oil furnace comprises a heat conducting 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 connecting pipelines, heat conducting oil is sequentially connected with the hot 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 hot 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.

[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, an evaporator 15 and connecting pipelines thereof.

[0011] The organic Rankine cycle device comprises the evaporator 15, an organic working medium gas turbine 17, an organic working medium generator 18, a condenser 20, an organic working medium circulating pump 24 and connecting pipelines thereof.

[0012] The oil gas heater 13 is arranged on a flue 9 of the high-temperature side heat conducting oil furnace, high-temperature flue gas in the flue 9 is discharged after temperature reduction through 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 evaporator 15 to heat liquid organic working medium 23 sent by the organic working medium circulating pump 24, and is returned to the heat accumulating oil tank 11, the liquid organic working medium 23 sent by the organic working medium circulating pump 24 is heated through the evaporator 15, high-pressure gaseous organic working medium 16 generated after heating enters the organic working medium gas turbine 17 to drive the organic working medium generator 18 to generate electricity, low-pressure and low-temperature gaseous organic working medium 19 out of the organic working medium gas turbine 17 enters the condenser 20 to be cooled by a refrigerant 21, thereby forming the liquid organic working medium 23 entering the organic working medium circulating pump 24, thereby forming the organic heat carrier furnace combined heat and power system, and the refrigerant 21 with increased temperature forms a heat medium 22 and is discharged.

[0013] The refrigerant of the condenser 20 in the organic Rankine cycle device is air or water.

[0014] The low-position oil storage tank 8 and the heat accumulating oil tank 11 can be combined into one.

[0015] When the low-position oil storage tank 8 and the heat accumulating oil tank 11 are combined into one, nitrogen sealing and heat preservation measures are adopted.

[0016] The heat conducting oil from the heat conducting oil tank 11 is guided through the micro heat conducting oil pump 12, the oil gas heater 13, absorbs the heat of the flue gas in the flue 9, and is sent to the air preheater 14 to heat the air from the air blower 10, and then returns to the heat conducting oil tank 11. The air from the air blower 10 is heated by the air preheater 14, and then is sent to the burner 2 of the high-temperature heat conducting oil furnace as combustion air, thereby forming a new type of organic heat carrier furnace with the combined cycle operation mode of the high-temperature heat conducting oil furnace and the low-temperature micro heat conducting oil furnace.

[0017] The superheater 25 is provided.

[0018] The heat conducting oil of the high-temperature heat conducting oil furnace is sequentially guided through the pipeline-connected heat oil pump 7, the heat conducting oil furnace body 1, the superheater 25, the heat-using equipment 3, the oil gas separator 5, and the filter 6, and returns to the heat oil pump 7.

[0019] Or one way of the heat conducting oil of the high-temperature heat conducting oil furnace is guided through the pipeline-connected heat oil pump 7, the heat conducting oil furnace body 1, the heat-using equipment 3, the oil gas separator 5, and the filter 6, and returns to the heat oil pump 7, and the other way of the heat conducting oil of the high-temperature heat conducting oil furnace is guided through the pipeline-connected heat oil pump 7, the heat conducting oil furnace body 1, the superheater 25, the oil gas separator 5, and the filter 6, and returns to the heat oil pump 7.

[0020] The flue gas with high temperature in the flue 9 of the high-temperature heat conducting oil furnace is discharged after being reduced in temperature by the oil gas heater 13. The heat conducting oil from the heat conducting oil tank 11 is guided through the micro heat conducting 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 evaporator 15 to heat the liquid organic working medium 23 from the organic working medium circulating pump 24, and then returns to the heat conducting oil tank 11. The liquid organic working medium 23 from the organic working medium circulating pump 24 is heated by the evaporator 15 and the superheater 25, and the generated high-pressure gaseous organic working medium 16 enters the organic working medium gas turbine 17 to drive the organic working medium generator 18 to generate electricity. The low-pressure and low-temperature gaseous organic working medium 19 from the organic working medium gas turbine 17 enters the condenser 20 to be cooled by the refrigerant 21, and forms the liquid organic working medium 23. The temperature-increased refrigerant 21 forms the heat medium 22 and is discharged, thereby forming an organic heat carrier furnace cogeneration system.

[0021] The burner 2 of the high-temperature heat conducting oil furnace uses coal, oil or gas as fuel.

[0022] The oil gas heater 13 and the flue gas adopt an indirect heat exchange mode. The hot air heated by the oil gas heater 13 is sent to the heat conducting oil furnace 1 as combustion air.

[0023] 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.

[0024] The oil-gas heater 13 can be a shell-and-tube heat exchanger, a plate heat exchanger or other type of heat exchanger.

[0025] The oil-gas heater 13 is controlled to have an oil inlet temperature of, for example, above 90 DEG C, so as to effectively avoid low-temperature corrosion of the oil-gas heater 13, and under the premise of avoiding dew formation, the maximum utilization of waste heat of flue gas is achieved, so that the heat conduction oil furnace can be economically and highly efficiently operated, and the purpose of energy saving and consumption reduction is achieved.

[0026] The unexplained facilities in the organic heat carrier furnace combined heat and power system are matched according to reliable and mature technologies in the known organic heat carrier furnace.

[0027] Compared with the prior art, the organic heat carrier furnace combined heat and power system has the following advantages.

[0028] 1. Compared with the prior art, the organic heat carrier furnace combined heat and power system is added with a micro heat conduction oil furnace system and an organic Rankine cycle power generation device on the basis of a traditional heat conduction oil furnace system, so as to form a combined heat and power system in a combined cycle operation mode of the organic heat carrier furnace, flue gas waste heat is utilized to realize organic Rankine cycle power generation by the micro heat conduction oil furnace system, low-temperature corrosion of an oil-gas heater is effectively avoided, flue gas discharge temperature can reach about 130 DEG C, and the energy saving and environmental protection requirements are met.

[0029] 2. Compared with the prior art, the organic heat carrier furnace combined heat and power system is flexible and convenient to operate and adjust, and the organic Rankine cycle power generation unit is utilized to conveniently realize variable load operation condition adjustment. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a structural schematic view of an organic heat carrier furnace combined heat and power system.

[0031] Figure 1 In the figure, 1 is a heat conduction oil furnace body, 2 is a burner, 3 is a heat-using device, 4 is a high-position expansion tank, 5 is an oil-gas separator, 6 is a filter, 7 is a hot oil pump, 8 is a low-position oil storage tank, 9 is a flue, 10 is a blower, 11 is a heat storage oil tank, 12 is a micro heat conduction oil pump, 13 is an oil-gas heater, 14 is an external air preheater, 15 is an evaporator, 16 is a high-pressure gaseous organic working medium, 17 is an organic working medium gas turbine, 18 is an organic working medium generator, 19 is a low-pressure low-temperature gaseous organic working medium, 20 is a condenser, 21 is a cold medium, 22 is a hot medium, 23 is a liquid organic working medium, 24 is an organic working medium circulating pump and 25 is a superheater. DETAILED DESCRIPTION

[0032] The organic heat carrier furnace combined heat and power system will be further described in detail below in combination with the accompanying drawings and specific embodiments. Figure 1

[0033] ​Embodiment 1:

[0034] An organic heat carrier furnace combined heat and power system comprises a high-temperature side heat conducting oil furnace, a low-temperature side micro heat conducting oil furnace and an organic Rankine cycle device,

[0035] 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, a filter 6 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, the oil gas separator 5 and the filter 6 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,

[0036] 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 evaporator 15 and connecting pipelines thereof,

[0037] The organic Rankine cycle device comprises the evaporator 15, an organic working medium gas turbine 17, an organic working medium generator 18, a condenser 20, an organic working medium circulating pump 24 and connecting pipelines thereof,

[0038] 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 is reduced through 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, and is sent into the evaporator 15 to heat liquid organic working medium 23 sent by the organic working medium circulating pump 24, and then returns to the heat accumulating oil tank 11, the liquid organic working medium 23 sent by the organic working medium circulating pump 24 is heated through the evaporator 15, high-pressure gaseous organic working medium 16 generated after heating enters the organic working medium gas turbine 17 to drive the organic working medium generator 18 to generate electricity, low-pressure low-temperature gaseous organic working medium 19 out of the organic working medium gas turbine 17 enters the condenser 20 to be cooled by refrigerant 21, and forms the liquid organic working medium 23 entering the organic working medium circulating pump 24, thereby forming the organic heat carrier furnace combined heat and power system, and the refrigerant 21 with a temperature increased forms heat medium 22 and is discharged.

[0039] The refrigerant of the condenser 20 in the organic Rankine cycle device adopts air or water.

[0040] The low-position oil storage tank 8 and the heat accumulating oil tank 11 can be combined into one.

[0041] When the low-position oil storage tank 8 and the heat accumulating oil tank 11 are combined into one, nitrogen sealing and heat preservation measures are adopted.

[0042] The heat conducting oil from the heat conducting oil tank 11 is guided through the micro heat conducting oil pump 12, the oil gas heater 13, absorbs the heat of the flue gas in the flue 9, and is sent to the air preheater 14 to heat the air from the air blower 10, and then returns to the heat conducting oil tank 11.

[0043] The superheater 25 is arranged.

[0044] The heat conducting oil of the high temperature side heat conducting oil furnace is guided through the heat oil pump 7, the heat conducting oil furnace body 1, the superheater 25, the heat using equipment 3, the oil gas separator 5, the filter 6 in sequence, and returns to the heat oil pump 7,

[0045] The flue gas with high temperature in the flue 9 of the high temperature side heat conducting oil furnace is discharged after being reduced in temperature by the oil gas heater 13, the heat conducting oil from the heat conducting oil tank 11 is guided through the micro heat conducting 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 evaporator 15 to heat the liquid organic working medium 23 from the organic working medium circulating pump 24, and then returns to the heat conducting oil tank 11, the liquid organic working medium 23 from the organic working medium circulating pump 24 is heated through the evaporator 15 and the superheater 25, the high pressure gaseous organic working medium 16 generated is introduced into the organic working medium gas turbine 17 to drive the organic working medium generator 18 to generate electricity, the low pressure and low temperature gaseous organic working medium 19 from the organic working medium gas turbine 17 is introduced into the condenser 20 to be cooled by the refrigerant 21, and the liquid organic working medium 23 is formed, the refrigerant 21 with increased temperature is discharged as the heat medium 22, thereby forming the organic heat carrier furnace cogeneration system.

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

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

[0048] 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.

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

[0050] The oil gas heater 13 is controlled to have an oil inlet temperature (for example, above 90℃), which 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 economically and high efficiency operated, and the purpose of energy saving and consumption reduction is achieved.

[0051] The unexplained facilities in the organic heat carrier furnace combined heat and power system are matched according to reliable and mature technologies in the known organic heat carrier furnace.

[0052] Although the utility model has disclosed as above with preferable embodiments, they are not used to limit the utility model, any person skilled in the art, should be able to make various changes or refinements without departing from the spirit and scope of the utility model, similarly belong to the protection scope of the utility model. For example, the utility model can utilize heat conducting oil to recover waste heat, preheat air, and heat conducting oil forms closed circuit circulation, and the same can realize the 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. An organic heat carrier boiler combined heat and power system, characterized in that: the organic heat carrier boiler combined heat and power system comprises a high-temperature side heat conducting oil boiler, a low-temperature side micro heat conducting oil boiler and an organic Rankine cycle device, the high-temperature side heat conducting oil boiler comprises a heat conducting oil boiler body (1), a burner (2), a hot oil pump (7), a heat using equipment (3), an oil gas separator (5) and connecting pipelines, heat conducting oil passes through the hot oil pump (7), the heat conducting oil boiler body (1), the heat using equipment (3) and the oil gas separator (5) in sequence and returns to the hot oil pump (7), the high-temperature side heat conducting oil boiler 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, the low-temperature side micro heat conducting oil boiler comprises a heat accumulating oil tank (11), a micro heat conducting oil pump (12), an oil gas heater (13), an evaporator (15) and connecting pipelines thereof, the organic Rankine cycle device comprises the evaporator (15), an organic working medium gas turbine (17), an organic working medium generator (18), a condenser (20), an organic working medium circulating pump (24) and connecting pipelines thereof, the oil gas heater (13) is arranged on a flue (9) of the high-temperature side heat conducting oil boiler, flue gas with a high temperature in the flue (9) is discharged after its temperature 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) and is then sent into the evaporator (15) to heat liquid organic working medium (23) sent by the organic working medium circulating pump (24) and then returns to the heat accumulating oil tank (11), the liquid organic working medium (23) sent by the organic working medium circulating pump (24) is heated by the evaporator (15) to generate high-pressure gaseous organic working medium (16) which enters the organic working medium gas turbine (17) to drive the organic working medium generator (18) to generate power, low-pressure low-temperature gaseous organic working medium (19) from the organic working medium gas turbine (17) enters the condenser (20) to be cooled by a refrigerant (21) to form liquid organic working medium (23) which enters the organic working medium circulating pump (24), thereby forming the organic heat carrier boiler combined heat and power system, and the refrigerant (21) with a raised temperature forms a heat medium (22) which is discharged.

2. The organic heat carrier boiler combined heat and power system 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 organic heat carrier boiler combined heat and power system according to claim 1, characterized in that: ​ ​ ​ ​ ​ ​ The heat-conducting oil drawn 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 external air preheater (14) to heat the air sent by the air blower (10), and then is returned to the heat storage oil tank (11). The air sent by the air blower (10) is heated by the external 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 the high-temperature side heat-conducting oil furnace and the low-temperature side micro heat-conducting oil furnace are combined to operate in a circulating mode.

4. The organic heat carrier furnace cogeneration system 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 organic heat carrier furnace cogeneration system according to claim 1, characterized in that: A superheater (25) is arranged: The heat-conducting oil of the high-temperature side heat-conducting oil furnace is sequentially returned to the heat oil pump (7) through the pipeline-connected heat oil pump (7), the heat-conducting oil furnace body (1), the superheater (25), the heat-using equipment (3), the oil-gas separator (5) and the filter (6).

6. The organic heat carrier furnace cogeneration system according to claim 1, characterized in that: A superheater (25) is arranged: One of the heat-conducting oils of the high-temperature side heat-conducting oil furnace is returned to the heat oil pump (7) through the pipeline-connected heat oil pump (7), the heat-conducting oil furnace body (1), the heat-using equipment (3), the oil-gas separator (5) and the filter (6), and the other heat-conducting oil is returned to the heat oil pump (7) through the pipeline-connected heat oil pump (7), the heat-conducting oil furnace body (1), the superheater (25), the oil-gas separator (5) and the filter (6).

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

8. The organic heat carrier furnace cogeneration system according to claim 2, characterized in that: The low-position oil storage tank (8) is sealed by nitrogen and is provided with heat preservation measures.

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