Heating medium filling system with vacuum suction function

Abstract

The utility model discloses a heating medium filling system with a vacuum suction function. The heating medium filling system comprises a heating medium head tank, a reaction kettle jacket, a vacuum suction pump, a vacuum cold trap, a first pipeline, a second pipeline, a third pipeline, an oil guide pipeline and a filling pipeline, an inlet valve is arranged at an inlet of the vacuum cold trap, an outlet valve is arranged at an outlet of the vacuum cold trap, the inlet valve is communicated with the heating medium head tank through a first pipeline, the outlet valve is communicated with the vacuum suction pump through a second pipeline, the oil guide pipeline is connected with the reaction kettle jacket, and the oil guide pipeline is communicated with the heating medium head tank through a third pipeline. The third pipeline is provided with an emptying valve; the filling pipeline is connected with the oil guide pipeline and provided with a filling valve. Before the heating medium system is filled, the vacuum suction pump is used for sucking the heating medium system to be in a vacuum state, so that the heating medium filling efficiency can be ensured, a pipeline is filled with a heating medium, air can be isolated, and the situation that the service life of the heating medium is affected due to the oxidation reaction of the heating medium under the heating condition can be prevented.

Description

Technical Field

[0001] The utility model relates to heat medium filling equipment, and more specifically to a heat medium filling system with a vacuum suction function. Background Art

[0002] Heat medium is a general term for heat carriers in chemical production. According to different use temperatures, heat medium mainly consists of four categories: inorganic salts, mineral oils, water vapor and organic compounds. The basic properties, heating system settings, phase states and operation methods of various heat mediums are very different.

[0003] Thermal stability is an important property of heat media, that is, it will not decompose or deteriorate during long-term high-temperature operation. Hydrogenated terphenyl has good thermal stability at high temperatures due to the close distribution of three six-membered rings in the chemical structure and the stability of the benzene conjugated system. It rarely decomposes, so it has the characteristics of long life and low replenishment during use.

[0004] The heat medium commonly used in polyester devices is the organic heat carrier hydrogenated terphenyl. Hydrogenated terphenyl is a liquid phase heat carrier, which is obtained by hydrogenating terphenyl; the hydrogenation depth is about 60-70%. The raw material terphenyl is also a mixture of ortho-, meta- and para-terphenyl. Therefore, the hydrogenated terphenyl commonly used is actually a mixture of three isomers.

[0005] However, hydrogenated terphenyl is an organic substance, and cracking and thermal polymerization reactions will inevitably occur after long-term operation at high temperatures. The result of cracking is that the vapor pressure of hydrogenated terphenyl increases, the initial distillation point and flash point decrease, and the viscosity and specific gravity decrease; while the result of thermal polymerization will generate compounds with larger molecular weight, and finally generate coke and precipitate, affecting material transportation and heat transfer. In addition, due to leakage or poor nitrogen sealing, when air and high-temperature hydrogenated terphenyl are in direct contact, the reaction will be accelerated to generate residual carbon. The higher the operating temperature, the faster the rate of this cracking and thermal polymerization reaction. Therefore, in actual use, the maximum temperature cannot exceed 375℃, and the maximum use temperature should be controlled below 343℃.

[0006] The long-term operation of the heat medium system may lead to the volatilization of heat medium and the switching of heat medium filters, which will cause the amount of heat medium in the heat medium system to decrease. Or there may be a pipeline valve leak in a single heat medium system that needs to be discharged and repaired. All of the above situations require the filling of the heat medium system. At present, when filling the heat medium system, there may be a filling blind spot, and air is easy to enter some pipes or chambers, affecting the stability and safety of the entire heat medium system.

[0007] Therefore, a new solution needs to be proposed to solve this problem. Utility Model Content

[0008] The purpose of the utility model is to overcome the above-mentioned deficiencies of the prior art and provide a heat medium filling system with a vacuum suction function, which can safely and efficiently fill the heat medium system with heat medium.

[0009] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0010] A heat medium filling system with a vacuum suction function comprises a heat medium high-level tank, a reactor jacket, a vacuum suction pump, a vacuum cold trap, a first pipeline, a second pipeline, a third pipeline, an oil guide pipeline and a filling pipeline; an inlet valve is arranged at the inlet of the vacuum cold trap, an outlet valve is arranged at the outlet of the vacuum cold trap, the inlet valve is communicated with the heat medium high-level tank through a first pipeline, the outlet valve is communicated with the vacuum suction pump through a second pipeline, the oil guide pipeline is connected with the reactor jacket, the oil guide pipeline is communicated with the heat medium high-level tank through a third pipeline, and the third pipeline is equipped with a vent valve; the filling pipeline is connected with the oil guide pipeline, and the filling pipeline is equipped with a filling valve.

[0011] The utility model is further configured to further include a first pressure meter and a second pressure meter, wherein the first pressure meter and the second pressure meter are used to detect the pressure at the inlet and the outlet of the vacuum cold trap respectively.

[0012] The utility model is further configured such that the first pressure instrument is arranged between the inlet and the inlet valve of the vacuum cold trap; and the second pressure instrument is arranged between the outlet valve of the vacuum cold trap and the vacuum suction pump.

[0013] The utility model is further configured to include a heat medium delivery pump, the oil guide pipeline includes an oil inlet section and an oil return section, the oil inlet section connects the heat medium delivery pump and the reactor jacket, and the oil return section also connects the heat medium delivery pump and the reactor jacket.

[0014] The utility model is further configured such that the connection position between the oil inlet section and the reactor jacket is located at the bottom of the reactor jacket.

[0015] The utility model is further configured such that the connection position between the oil return section and the reactor jacket is located at the upper part of the reactor jacket and is higher than the connection position between the oil inlet section and the reactor jacket.

[0016] The utility model is further configured that the third pipeline is communicated with the oil return section of the oil guide pipeline.

[0017] The utility model is further configured such that the connecting point between the third pipeline and the oil return section of the oil guiding pipeline is located at the highest point of the oil guiding pipeline.

[0018] The utility model is further configured that the filling pipeline is communicated with the oil inlet section of the oil guide pipeline.

[0019] The utility model is further configured such that the connection point between the filling pipeline and the oil inlet section is located at a relatively low point of the oil guide pipeline.

[0020] The utility model is further configured such that the position of the heat medium high-level tank is higher than the jacket of the reactor.

[0021] In summary, the utility model has the following beneficial effects:

[0022] A vacuum suction pump can be used to create a negative pressure in the heat medium system before filling. During filling, the heat medium can quickly and safely fill the heat medium system through negative pressure filling, avoiding filling blind spots and ensuring that all pipes in the heat medium system are filled with heat medium. Moreover, the filling pipe and the filling valve are located at a relatively low point in the entire heat medium system. During the negative pressure filling process, filling is performed from bottom to top, which can discharge the residual air in the pipes of the heat medium system upwards, isolate the air, and prevent the heat medium from oxidizing when heated, thereby affecting the service life of the heat medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the structure of a heat medium filling system with vacuum suction function in this embodiment.

[0024] Figure numerals: 1. heat medium high-level tank; 2. reactor jacket; 3. vacuum suction pump; 4. vacuum cold trap; 41. inlet valve; 42. outlet valve; 43. first pressure instrument; 44. second pressure instrument; 5. first pipeline; 6. second pipeline; 7. third pipeline; 71. vent valve; 8. oil guide pipeline; 81. oil inlet section; 82. oil return section; 9. filling pipeline; 91. filling valve; 10. heat medium delivery pump. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] This embodiment discloses a heat medium filling system with a vacuum suction function. Figure 1 As shown, it includes a heat medium high-level tank 1, a reactor jacket 2, a vacuum suction pump 3, a vacuum cold trap 4, a first pipeline 5, a second pipeline 6, a third pipeline 7, an oil guide pipeline 8 and a filling pipeline 9. The heat medium high-level tank 1 is located higher than the reactor jacket 2 and is located at a relatively high position in the entire system. The volume of the heat medium high-level tank 1 is 10m 3 ~100m 3In general, the pressure is controlled at 10kpa~90kpa.

[0027] The vacuum cold trap 4 has an inlet and an outlet, an inlet valve 41 is installed at the inlet of the vacuum cold trap 4, and an outlet valve 42 is installed at the outlet. The inlet valve 41 is connected to the heat medium high-level tank 1 through a first pipeline 5, and the outlet valve 42 is connected to the vacuum suction pump 3 through a second pipeline 6. The vacuum cold trap 4 can be turned on and off by corresponding valves.

[0028] The heat medium filling system also includes a first pressure meter 43 and a second pressure meter 44, which are used to detect the pressure at the inlet and outlet of the vacuum cold trap 4. The first pressure meter 43 is arranged between the inlet of the vacuum cold trap 4 and the inlet valve 41, and the second pressure meter 44 is arranged between the outlet valve 42 of the vacuum cold trap 4 and the vacuum suction pump 3. The pressure parameters at the corresponding positions can be detected by the two pressure meters.

[0029] The oil guide pipe 8 is connected to the reactor jacket 2, and the oil guide pipe 8 is connected to the heat medium high-level tank 1 through the third pipe 7. The heat medium high-level tank and the reactor jacket 2 can be connected in sequence through the third pipe 7 and the oil guide pipe 8. A vent valve 71 is installed on the third pipe 7, and the on-off adjustment of the vent valve 71 can control the on-off of the third pipe 7.

[0030] The filling pipeline 9 is connected to the oil guide pipeline 8, and the filling pipeline 9 can pass the heat medium into the reactor jacket 2. A filling valve 91 is installed at the filling pipeline 9, and the filling valve 91 is located at a relatively low point of the entire heat medium system.

[0031] The oil guide pipe 8 is divided into two sections, specifically including an oil inlet section 81 and an oil return section 82. In addition, the heat medium filling system also includes a heat medium delivery pump 10, through which the heat medium in the oil guide pipe 8 and the reactor jacket 2 can be pumped, so that the heat medium can fill the entire heat medium system, achieving the purpose of safety and efficiency.

[0032] Among them, the oil inlet section 81 connects the heat medium delivery pump 10 and the reactor jacket 2, and the oil return section 82 also connects the heat medium delivery pump 10 and the reactor jacket 2. And the connection position of the oil inlet section 81 and the reactor jacket 2 is located at the bottom of the reactor jacket 2. The connection position of the oil return section 82 and the reactor jacket 2 is located at the upper part of the reactor jacket 2, and is higher than the connection position of the oil inlet section 81 and the reactor jacket 2. The oil inlet section 81 and the oil return section 82 can form two connection points outside the reactor jacket 2, so that the upper and lower layers of the heat medium delivery pump 10 are connected by pipelines, which is conducive to the mutual circulation of heat medium in the upper and lower layers, and is conducive to the filling, replacement and exhaust treatment of heat medium, so that the inside of the reactor jacket 2 can be filled with heat medium, making the entire system safer and more efficient.

[0033] The third pipeline 7 is connected to the oil return section 82 of the oil guide pipeline 8. The third pipeline 7 can be connected through the oil return section 82 of the oil guide pipeline 8, so that the reactor jacket 2 and the heat medium high-level tank 1 can be connected to each other, so that the heat medium can be discharged from the third pipeline 7, so that the heat medium can flow smoothly, which is beneficial to the exhaust and filling of the heat medium system. In addition, the filling pipeline 9 is connected to the oil inlet section 81 of the oil guide pipeline 8, so that the oil return section 81 of the oil guide pipeline 8 has two connection points, which is beneficial to the reflux and circulation of the heat medium during filling. The connection point between the filling pipeline 9 and the oil inlet section 81 is located at the relatively low point of the oil inlet section 81, which is the lowest point of the entire oil guide pipeline 8 and the lowest point of the entire heat medium system. Filling the heat medium from the filling valve can form a bottom-up filling. Through the pumping action of the heat medium delivery pump 10, the heat medium can circulate between the reactor jacket 2 and the oil guide pipe 8, and the heat medium can be heat exchanged at the oil guide pipe 8. Through the circulation of the heat medium, it can flow into the reactor jacket 2, thereby heating the reactor.

[0034] In the heat medium filling system with vacuum suction function of this embodiment, before filling, the inlet valve 41 and the outlet valve 42 of the vacuum cold trap 4 are opened, the vent valve 71 is opened, and the vacuum suction pump 3 is started to pump the heat medium system into a negative pressure state.

[0035] When the heat medium system reaches the preset negative pressure state, close the inlet valve 41 and the outlet valve 42 of the vacuum cold trap 4, open the filling valve 91 of the heat medium system, and fill the heat medium system with negative pressure. When the liquid level in the heat medium high-level tank 1 begins to rise, it means that the heat medium system is fully filled, and then close the filling valve 91 and the vent valve 71.

[0036] Since the filling valve 91 is located at a relatively low position of the heat medium system and the heat medium system is in a negative pressure state during filling, the filling pipe 9 can quickly fill the entire heat medium system when filling the heat medium, thereby achieving the purpose of safety and efficiency; in addition, the heat medium enters from a low point, and the air in the pipeline and the reactor jacket 2 can be discharged to the heat medium high-level tank 1 through the third pipe 7, ensuring that the heat medium can be fully filled.

[0037] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A heat medium filling system with vacuum suction function, characterized in that: The invention comprises a heat medium high-level tank (1), a reactor jacket (2), a vacuum suction pump (3), a vacuum cold trap (4), a first pipeline (5), a second pipeline (6), a third pipeline (7), an oil guide pipeline (8) and a filling pipeline (9); an inlet valve (41) is arranged at the inlet of the vacuum cold trap (4), an outlet valve (42) is arranged at the outlet of the vacuum cold trap (4), the inlet valve (41) is connected to the heat medium high-level tank (1) through the first pipeline (5), the outlet valve (42) is connected to the vacuum suction pump (3) through the second pipeline (6), the oil guide pipeline (8) is connected to the reactor jacket (2), the oil guide pipeline (8) is connected to the heat medium high-level tank (1) through the third pipeline (7), and the third pipeline (7) is installed with a vent valve (71); the filling pipeline (9) is connected to the oil guide pipeline (8), and the filling pipeline (9) is installed with a filling valve (91).

2. A heat medium filling system with vacuum suction function according to claim 1, characterized in that: It also comprises a first pressure meter (43) and a second pressure meter (44), wherein the first pressure meter (43) and the second pressure meter (44) are used to detect the pressure at the inlet and outlet of the vacuum cold trap (4), respectively.

3. A heat medium filling system with vacuum suction function according to claim 2, characterized in that: The first pressure instrument (43) is arranged between the inlet of the vacuum cold trap (4) and the inlet valve (41); the second pressure instrument (44) is arranged between the outlet valve (42) of the vacuum cold trap (4) and the vacuum suction pump (3).

4. The heat medium filling system with vacuum suction function according to claim 1, characterized in that: It also includes a heat medium delivery pump (10), and the oil guide pipeline (8) includes an oil inlet section (81) and an oil return section (82), the oil inlet section (81) connects the heat medium delivery pump (10) and the reactor jacket (2), and the oil return section (82) also connects the heat medium delivery pump (10) and the reactor jacket (2).

5. The heat medium filling system with vacuum suction function according to claim 4, characterized in that: The connection position between the oil inlet section (81) and the reactor jacket (2) is located at the bottom of the reactor jacket (2).

6. A heat medium filling system with vacuum suction function according to claim 5, characterized in that: The connection position between the oil return section (82) and the reactor jacket (2) is located at the upper part of the reactor jacket (2) and is higher than the connection position between the oil inlet section (81) and the reactor jacket (2).

7. The heat medium filling system with vacuum suction function according to claim 4, characterized in that: The third pipeline (7) is in communication with the oil return section (82) of the oil guide pipeline (8).

8. The heat medium filling system with vacuum suction function according to claim 7, characterized in that: The connection point between the third pipeline (7) and the oil return section (82) of the oil guide pipeline (8) is located at the highest point of the oil guide pipeline (8).

9. The heat medium filling system with vacuum suction function according to claim 4, characterized in that: The filling pipeline (9) is in communication with the oil inlet section (81) of the oil guide pipeline (8).

10. The heat medium filling system with vacuum suction function according to claim 9, characterized in that: The connection point between the filling pipeline (9) and the oil inlet section (81) is located at a relatively low point of the oil guide pipeline (8).

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