Heating system for heat conduction oil

Abstract

The utility model relates to a heating system for conduction oil, and belongs to the technical field of heating systems. Comprising a first cold oil tank, a second cold oil tank and a third cold oil tank, the cold oil tank I, the cold oil tank II and the cold oil tank III are connected with the heater I, the heater II and the heater III; the cold oil tank I is provided with a cold oil pump I; the cold oil tank II is provided with a cold oil pump II; the third cold oil tank is provided with a third cold oil pump. The heater I, the heater II and the heater III are connected with the hot oil tank I, the hot oil tank II and the hot oil tank III; the hot oil tank I, the hot oil tank II and the hot oil tank III are connected with the oil-gas heat exchanger; hot oil pumps are arranged between the hot oil tank I, the hot oil tank II and the hot oil tank III and the oil-gas heat exchanger; the oil-gas heat exchanger is connected with the cold oil tank. According to the utility model, the step-by-step heating of the heat-conducting oil is realized, and the thermal shock phenomenon is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of heating systems, and particularly relates to a heating system for heat-conducting oil. Background Art

[0002] Multi-source heat storage compressed air energy storage power generation is a new type of power generation method. Heat-conducting oil (heavy alkylbenzene) is used as a heat transfer and heat storage medium. After absorbing the heat of a trough solar thermal system and increasing in temperature, it is then heated by an electric heater and stored in a high-temperature heat-conducting oil tank, serving as the heat source for heating compressed air by an air turbine.

[0003] The existing heat-conducting oil system stores cold oil in multiple cold oil tanks, and the heat-conducting oil is heated by an electric heater supplied by a cold oil pump to a temperature of 250°C and then stored in a high-temperature oil tank. When the unit generates electricity, the hot oil in the high-temperature oil tank is transported to an oil-gas heat exchanger by a high-temperature oil pump to heat high-pressure compressed air for power generation. After heat exchange with the hot oil passing through the oil-gas heat exchanger, it flows into the cold oil tank through a pipeline for storage, preparing for the next round of power generation. The heat-conducting oil of newly built units needs to be heated to a relatively high temperature for dehydration and steam exhaust to remove light components, ensuring the use quality and performance stability of the heat-conducting oil.

[0004] The usual connection method of the heat-conducting oil heating system is as follows: 1 # Cold oil tank - Electric heater - Oil-gas heat exchanger - 1 # Hot oil storage tank - 1 # Cold oil tank; after one heating cycle, the next heating cycle is carried out: 2 # Cold oil tank - Electric heater - Oil-gas heat exchanger - 2 # Hot oil storage tank - 2 # Cold oil tank. And so on, heating the heat-conducting oil in all cold oil tanks one by one. During this process, the pipelines connected to the heater and the oil-gas heat exchanger belong to the common part. After the heat-conducting oil in one cold oil tank is heated, the pipelines participating in the heat-conducting oil transmission and the temperature of the heat-conducting oil can reach 250°C. If the heating work of the heat-conducting oil in the next cold oil tank is carried out at this time, it will inevitably cause the unheated heat-conducting oil to mix with the 250°C heat-conducting oil in the common pipeline, and the rapid cold and heat changes will cause the pipeline thermal stress to change sharply, generating a thermal shock. Content of the Utility Model

[0005] Aiming at the thermal shock phenomenon easily caused by the large temperature difference between the initial oil temperature and the pipeline during the replacement batch heating of heat-conducting oil in the prior art, the utility model provides a heating system for heat-conducting oil to solve the above problems.

[0006] The technical solution of the utility model is as follows:

[0007] A heating system for heat-conducting oil, comprising: a cold oil tank; the cold oil tank includes a first cold oil tank, a second cold oil tank and a third cold oil tank which are arranged in parallel; the first cold oil tank, the second cold oil tank and the third cold oil tank are all connected to a first heater, a second heater and a third heater; the first cold oil tank is provided with a first cold oil pump, and the first cold oil pump is provided with a temperature control switch; the second cold oil tank is provided with a second cold oil pump, and the second cold oil pump is provided with a temperature control switch; the third cold oil tank is provided with a third cold oil pump, and the third cold oil pump is provided with a temperature control switch; the first heater, the second heater and the third heater are all connected to a first hot oil tank, a second hot oil tank and a third hot oil tank; the first hot oil tank, the second hot oil tank and the third hot oil tank are all connected to an oil-gas heat exchanger, and a hot oil pump is arranged between the first hot oil tank, the second hot oil tank, the third hot oil tank and the oil-gas heat exchanger; the oil-gas heat exchanger is connected to the cold oil tank.

[0008] The outlet pipelines of the first heater, the second heater and the third heater which are arranged in parallel are gathered together and extend to the subsequent equipment through a common pipeline, and are divided into three pipelines at the front ends of the first hot oil tank, the second hot oil tank and the third hot oil tank and are respectively connected to the first hot oil tank, the second hot oil tank and the third hot oil tank.

[0009] Further, the first heater and the second heater are electric heaters.

[0010] Further, the third heater is one of an electric heater or a burner.

[0011] Further, the first hot oil tank, the second hot oil tank and the third hot oil tank are all provided with vent valves to balance the pressure change in the tank caused by the alternation of cold and hot heat-conducting oil.

[0012] Further, a plurality of oil-gas heat exchangers are provided and arranged in parallel.

[0013] Further, the heating range of the first heater is 90~130°C; the heating range of the second heater is 130~200°C; the heating range of the third heater is 200~250°C.

[0014] Further, a hot oil pump is provided for each of the plurality of oil-gas heat exchangers.

[0015] The working principle of the present utility model is as follows: When heating the heat-conducting oil for the first time, a cold circulation is first carried out. Start the cold oil pump 1, open the vent valve at the top of the hot oil tank 1, and continuously discharge air, so that the heat-conducting oil can participate in the circulation in the entire system of the cold oil tank 1, the heater 1, the oil-gas heat exchanger and the pipeline. The cold circulation time is carried out according to the system design requirements (generally not less than 4 hours according to the pipeline size. Considering the relatively long process pipeline of this system, it is recommended to carry out at least 16 hours of cold circulation and 8 hours of standing). Then start the hot oil pump and heat up the heater 1 to 130 °C; when the temperature reaches the predetermined temperature, the temperature control switch set on the cold oil pump 1 closes the cold oil pump 1, and the cold oil pump 2 is started and continues to heat up to 200 °C. When the temperature reaches the predetermined temperature, the temperature control switch set on the cold oil pump 2 closes the cold oil pump 2, and the cold oil pump 3 is started and continues to heat up to 250 °C. If it is necessary to heat the second batch of heat-conducting oil, close the cold oil pump 3, the hot oil pump and the oil-gas heat exchanger, and at the same time close the valves of the cold oil tank 1 and the hot oil tank 1, open the valves of the cold oil tank 2 and the hot oil tank 2, and at the same time start the heater 1; the second batch of heat-conducting oil is heated to 90 °C - 100 °C by the heater 1 and then transported backward; at this time, the heated second batch of heat-conducting oil is mixed with the first batch of heat-conducting oil in the pipeline. Since the temperature difference between the two batches of heat-conducting oil is reduced, no thermal shock phenomenon will occur. The heat-conducting oil enters another oil-gas heat exchanger after passing through the hot oil tank 2 and finally returns to the cold oil tank 2. The subsequent heating cycle is the same as that of the first batch. Through the heating system of the present utility model, it is possible to ensure continuous heating of different batches of heat-conducting oil and avoid the occurrence of thermal shock phenomena.

[0016] The beneficial effects of the present utility model are as follows:

[0017] The heating system for heat-conducting oil provided by the present utility model realizes the step-by-step heating of the heat-conducting oil, reduces the temperature difference between the initial heat-conducting oil and the heated heat-conducting oil in the common pipeline, and reduces the speed of cold and heat alternation, thus avoiding the occurrence of thermal shock phenomena. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic structural diagram of the present utility model.

[0020] In the figure, 1 - Cold oil tank 1, 2 - Cold oil tank 2, 3 - Cold oil tank 3, 4 - Heater 1, 5 - Heater 2, 6 - Heater 3, 7 - Cold oil pump 1, 8 - Cold oil pump 2, 9 - Cold oil pump 3, 10 - Hot oil tank 1, 11 - Hot oil tank 2, 12 - Hot oil tank 3, 13 - Hot oil pump, 14 - Oil-gas heat exchanger, 15 - Vent valve. Detailed implementation mode

[0021] In order to enable those skilled in the art of this technology to better understand the technical solutions in this utility model, the following will clearly and completely describe the technical solutions in the embodiments of this utility model in conjunction with the accompanying drawings in the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, rather than all the embodiments. Based on the embodiments in this utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the scope of protection of this utility model.

[0022] Embodiment 1

[0023] A heating system for heat transfer oil, comprising: a cold oil tank; the cold oil tank includes Cold oil tank 1, Cold oil tank 2 and Cold oil tank 3 arranged in parallel; Cold oil tank 1, Cold oil tank 2 and Cold oil tank 3 are all connected to Heater 1, Heater 2 and Heater 3; Cold oil tank 1 is provided with Cold oil pump 1, and Cold oil pump 1 is provided with a temperature control switch; Cold oil tank 2 is provided with Cold oil pump 2, and Cold oil pump 2 is provided with a temperature control switch; Cold oil tank 3 is provided with Cold oil pump 3, and Cold oil pump 3 is provided with a temperature control switch; Heater 1, Heater 2 and Heater 3 are all connected to Hot oil tank 1, Hot oil tank 2 and Hot oil tank 3; Hot oil tank 1, Hot oil tank 2 and Hot oil tank 3 are all connected to the Oil-gas heat exchanger 14, and a Hot oil pump 13 is provided between Hot oil tank 1, Hot oil tank 2 and Hot oil tank 3 and the Oil-gas heat exchanger 14; the Oil-gas heat exchanger 14 is connected to the cold oil tank.

[0024] Embodiment 2

[0025] A heating system for heat transfer oil, comprising: a cold oil tank; the cold oil tank includes a first cold oil tank 1, a second cold oil tank 2 and a third cold oil tank 3 which are arranged in parallel; the first cold oil tank 1, the second cold oil tank 2 and the third cold oil tank 3 are all connected to a first heater 4, a second heater 5 and a third heater 6, and the first heater 4, the second heater 5 and the third heater 6 are electric heaters, wherein the heating range of the first heater 4 is 90 - 130 °C; the heating range of the second heater 5 is 130 - 200 °C; the heating range of the third heater 6 is 200 - 250 °C; the first cold oil tank 1 is provided with a first cold oil pump 7, and the first cold oil pump 7 is provided with a temperature control switch; the second cold oil tank 2 is provided with a second cold oil pump 8, and the second cold oil pump 8 is provided with a temperature control switch; the third cold oil tank 3 is provided with a third cold oil pump 9, and the third cold oil pump 9 is provided with a temperature control switch; the first heater 4, the second heater 5 and the third heater 6 are all connected to a first hot oil tank 10, a second hot oil tank 11 and a third hot oil tank 12, and the first hot oil tank 10, the second hot oil tank 11 and the third hot oil tank 12 are all provided with vent valves 15; the first hot oil tank 10, the second hot oil tank 11 and the third hot oil tank 12 are all connected to an oil-gas heat exchanger 14, and four oil-gas heat exchangers 14 are arranged in parallel; a hot oil pump 13 is provided between the first hot oil tank 10, the second hot oil tank 11 and the third hot oil tank 12 and the oil-gas heat exchanger 14; the oil-gas heat exchanger 14 is connected to the cold oil tank.

[0026] Although the present invention has been described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, those of ordinary skill in the art can make various equivalent modifications or substitutions to the embodiments of the present invention, and all such modifications or substitutions should fall within the scope of the present invention. / Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention.

Claims

1. A heating system for heat transfer oil, comprising: Cold oil tank; the cold oil tank includes cold oil tank one, cold oil tank two and cold oil tank three which are arranged in parallel; it is characterized in that cold oil tank one, cold oil tank two and cold oil tank three are all connected to heater one, heater two and heater three; cold oil pump one is provided in cold oil tank one, and a temperature control switch is provided on cold oil pump one; cold oil pump two is provided in cold oil tank two, and a temperature control switch is provided on cold oil pump two; cold oil pump three is provided in cold oil tank three, and a temperature control switch is provided on cold oil pump three; heater one, heater two and heater three are all connected to hot oil tank one, hot oil tank two and hot oil tank three; hot oil tank one, hot oil tank two and hot oil tank three are all connected to the oil-gas heat exchanger, and a hot oil pump is provided between hot oil tank one, hot oil tank two, hot oil tank three and the oil-gas heat exchanger; the oil-gas heat exchanger is connected to the cold oil tank.

2. The heating system for heat transfer oil according to claim 1, wherein Heater one and heater two are electric heaters.

3. A heating system for heat transfer oil according to claim 1, characterized in that, Heater three is one of an electric heater or a burner.

4. A heating system for heat transfer oil according to claim 1, characterized in that, Hot oil tank one, hot oil tank two and hot oil tank three are all provided with vent valves.

5. A heating system for heat transfer oil according to claim 1, characterized in that, The oil-gas heat exchangers are arranged in multiple numbers and in parallel.

6. A heating system for heat transfer oil according to claim 5, characterized in that, The oil-gas heat exchangers are all provided with hot oil pumps.

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