System for impregnating high-end graphite

Abstract

The utility model discloses a system for impregnating high-end graphite. The system comprises an asphalt working tank, an impregnating tank, a booster tank, a vacuum tank, an asphalt booster pump, an asphalt return pump and a vacuum pump, the asphalt working tank is circularly connected with the impregnating tank through an asphalt booster pump and an asphalt return pump; the impregnating tank is also connected with a booster tank, the booster tank is connected with a vacuum tank, and the vacuum tank is connected with a vacuum pump; the asphalt working tank is used for receiving liquid asphalt for impregnation, the liquid asphalt enters the impregnation tank after being pressurized by the asphalt booster pump, and redundant liquid asphalt in the impregnation tank returns to the asphalt working tank from the impregnation tank through the asphalt return pump; or the liquid asphalt enters the pressurizing tank from the impregnating tank and returns to the impregnating tank from the pressurizing tank; and the impregnation tank, the booster tank and the vacuum tank are communicated and vacuumized through a vacuum pump. The system disclosed by the utility model can enable an impregnated product to achieve a deep and uniform impregnation effect, the product porosity is low, the weight increasing rate is high, and the system is suitable for impregnating high-end graphite with various specifications and structures.

Description

Technical Field

[0001] The utility model relates to the technical field of graphite material preparation, in particular to a system for high-end graphite impregnation. Background Art

[0002] Impregnation is a very important process in the graphite industry, which determines the performance of the product. It is usually carried out after roasting. After the green body is roasted, due to the volatilization of the light components, the original volume gradually forms channels, making the product porous inside and reducing the density, affecting the performance of the finished product. The purpose of impregnation is to fill the molten asphalt and other impregnating agents into the pores and the open pores of the aggregate coke particles. After the impregnation is completed, it is roasted twice to reduce the porosity of the product and improve the density, strength, resistance, expansion coefficient and other properties.

[0003] The existing impregnation process of graphite products mainly includes: preheating, vacuuming, impregnation liquid injection, pressurization, pressure maintenance, decompression, impregnation liquid discharge, and cooling. For ordinary or coarse particles and small-sized graphite, the existing impregnation system can generally meet the requirements. As graphite materials gradually develop towards high-end fields such as large specifications, fine structures, and high density, the existing impregnation system will not be able to meet the needs.

[0004] For high-end graphite, the depth and uniformity of its impregnation have a crucial impact on product performance. Conventional impregnation systems often have problems such as low impregnation pressure, insufficient impregnation depth, and impregnation uniformity deviation. During the impregnation cooling process, the cooling rate is slow, and the impregnating agent in the impregnated product is also very easy to flow out from the inside, seriously reducing the impregnation effect. In addition, the existing impregnation system has a long production cycle, low efficiency, and the production cost cannot be controlled at a reasonable level. Therefore, there is an urgent need for a deep impregnation system for high-end graphite to solve these problems. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a system for impregnation of high-end graphite in order to solve the problems that the impregnation depth of high-end graphite is insufficient, the impregnation uniformity is poor, the system is cumbersome and complicated, the energy consumption is high and the like are difficult to meet the requirements of impregnation of high-end graphite. The system can be used for impregnation of high-end graphite, has stable and reliable operation, can ensure the impregnation depth, uniformity and consistency, and can make the impregnation of graphite reach a higher level.

[0006] In order to solve the above technical problems, the present invention can be implemented through the following technical solutions:

[0007] A system for impregnation of high-end graphite, comprising: an asphalt working tank, an impregnation tank, a booster tank, a vacuum tank, an asphalt booster pump, an asphalt return pump and a vacuum pump; the asphalt working tank is cyclically connected to the impregnation tank via the asphalt booster pump and the asphalt return pump; the impregnation tank is also connected to the booster tank, the booster tank is connected to the vacuum tank, and the vacuum tank is connected to the vacuum pump; the asphalt working tank is used to receive liquid asphalt for impregnation, the liquid asphalt enters the impregnation tank after being pressurized by the asphalt booster pump, and the excess liquid asphalt in the impregnation tank returns from the impregnation tank to the asphalt working tank via the asphalt return pump; alternatively, liquid asphalt enters the booster tank from the impregnation tank and returns from the booster tank to the impregnation tank; the impregnation tank, the booster tank and the vacuum tank are connected and then evacuated by a vacuum pump.

[0008] In a preferred embodiment of the utility model, the asphalt working tank is an outer coil pressure vessel, heat transfer oil is introduced into the outer coil of the outer coil pressure vessel for insulation, and the pressure vessel of the asphalt working tank is pressurized by injecting low-pressure nitrogen.

[0009] In a preferred embodiment of the utility model, the impregnation tank is an outer coil quick-opening door type pressure vessel, and heat transfer oil is introduced into the outer coil of the outer coil quick-opening door type pressure vessel for insulation or cooling. One end of the impregnation tank is a quick-opening door structure, and the quick-opening door is opened to realize the loading or unloading of the impregnated product; the impregnation tank is pressurized by injecting high-pressure nitrogen into the booster tank.

[0010] In a preferred embodiment of the present invention, the working pressure of the asphalt working tank is from normal pressure to 0.6MPa, and the working temperature is 200-250°C; the working pressure of the impregnation tank is 3kPa-4.5MPa, and the working temperature is from normal temperature to 250°C; the working pressure of the booster tank is 3kPa-4.5MPa, and the working temperature is from normal temperature to 250°C; the working pressure of the vacuum tank is 3kPa-101kPa, and the working temperature is from normal temperature to 250°C.

[0011] In a preferred embodiment of the present invention, the temperature of the heat transfer oil in the outer coil passing into the outer coil pressure vessel is 260°C-280°C.

[0012] In a preferred embodiment of the present utility model, the pressure of the low-pressure nitrogen injected into the pressure vessel of the asphalt working tank is 0.6MPa-0.8MPa.

[0013] In a preferred embodiment of the present invention, the temperature of the heat transfer oil in the outer coil of the outer coil quick-opening door pressure vessel is 80°C-280°C.

[0014] In a preferred embodiment of the utility model, the pressure of the impregnation tank is 4.5MPa-5.0MPa by injecting high-pressure nitrogen into the booster tank.

[0015] The utility model provides a system for impregnation of high-end graphite, which realizes the impregnation of high-end graphite. The system operates stably and reliably, can ensure the depth, uniformity and consistency of impregnation, and enables the impregnation of graphite to reach a higher level. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a system for high-end graphite impregnation provided by the utility model; in the figure: 101-asphalt working tank; 102-impregnation tank; 103-boosting tank; 104-vacuum tank; 105-asphalt booster pump; 106-return asphalt pump; 107-vacuum pump; 201-impregnation product; 202-liquid asphalt; 203-vacuum exhaust gas; 204-high-pressure nitrogen; 205-low-pressure nitrogen; 206 / 207 / 208 / 209 heat transfer oil. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with specific implementation methods.

[0018] Figure 1 This is a schematic diagram of an embodiment of a system for high-end graphite impregnation provided by the utility model. Figure 1 As shown, a system for high-end graphite impregnation, the system includes: an asphalt working tank 101, an impregnation tank 102, a booster tank 103, a vacuum tank 104, an asphalt booster pump 105, a return asphalt pump 106, and a vacuum pump 107; the asphalt working tank 101 is connected to the impregnation tank 102 through the asphalt booster pump 105 and the return asphalt pump 106, the impregnation tank 102 is connected to the booster tank 103, the booster tank 103 is connected to the vacuum tank 104, and the vacuum tank 104 is connected to the vacuum pump 107.

[0019] The asphalt working tank 101 is used to receive liquid asphalt for impregnation. The liquid asphalt enters the impregnation tank 102 through the asphalt booster pump 105. The liquid asphalt can also be returned to the asphalt working tank 101 from the impregnation tank (106) through the asphalt return pump (106); the liquid asphalt can enter the booster tank 103 from the impregnation tank 102, and can also be returned to the impregnation tank 102 from the booster tank 103; the impregnation tank 102, the booster tank 103, and the vacuum tank 104 are connected and evacuated by the vacuum pump 107.

[0020] Liquid asphalt 202 from the outside enters the asphalt working tank 101. Before receiving the liquid asphalt 202, the asphalt working tank 101 first uses heat transfer oil 206 to heat the tank body of the asphalt working tank 101. The temperature of the heat transfer oil is generally around 260°C. After the tank body of the asphalt working tank 101 is heated to a temperature greater than the softening point of the asphalt, the liquid asphalt can be received.

[0021] The liquid asphalt 202 is asphalt for dipping. The asphalt working tank 101 is provided with a liquid level detection instrument. When the asphalt liquid level reaches the upper liquid level, the asphalt receiving is stopped, and the pressure of the asphalt working tank 101 is increased to 0.8MPa by adding low-pressure nitrogen 205 for standby use.

[0022] The preheated impregnation product 201 is loaded into the impregnation tank 102. The preheating temperature of the impregnation product 201 is generally 200-250°C. After the impregnation product 201 is loaded into the impregnation tank 102, the tank body of the impregnation tank 102 is heated by the heat transfer oil 208. At the same time, the impregnation tank 102, the booster tank 103, and the vacuum tank 104 are connected. The impregnation tank 102 is evacuated by the vacuum pump 107, and the pressure of the impregnation tank 102 is reduced to 1 kPa and then maintained for about 0.5-1 hour.

[0023] After the pressure holding time is over, the connection between the boosting tank 103 and the vacuum tank 104 is cut off, and the asphalt boosting pump 105 is started to inject asphalt into the impregnation tank and the boosting tank 103. The boosting tank 103 is equipped with a liquid level detection instrument. When the boosting tank 103 is at a high liquid level, the injection of asphalt is stopped, and the connection between the asphalt boosting pump 105 and the return asphalt pump 106 and the impregnation tank is cut off at the same time, and high-pressure nitrogen 204 is injected into the boosting tank 103. The pressure of the high-pressure nitrogen is usually 5.5MPa, so that the asphalt in the boosting tank 103 is pressed into the impregnation product 201 in the impregnation tank 102 to achieve high-pressure impregnation. After the impregnation is completed, the remaining asphalt returns to the asphalt working tank 101 through the return asphalt pump 106.

[0024] Subsequently, the hot heat transfer oil in the impregnation tank is switched to cold heat transfer oil to cool the impregnation tank body, and after cooling to 180° C., the impregnated product 201 is carried out of the impregnation tank 102, thereby completing the impregnation process.

[0025] It can be seen from the above embodiments that the utility model realizes medium and high pressure impregnation of graphite through innovative system design and reasonable process parameter setting, and can ensure the impregnation depth, uniformity and consistency, so that the impregnation of graphite reaches the best level.

[0026] The above embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of 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.

Claims

1. A system for high-end graphite impregnation, characterized in that: include: Asphalt working tank, impregnation tank, booster tank, vacuum tank, asphalt booster pump, asphalt return pump and vacuum pump; the asphalt working tank is connected to the impregnation tank in a circulation manner through the asphalt booster pump and the asphalt return pump; the impregnation tank is also connected to the booster tank, the booster tank is connected to the vacuum tank, and the vacuum tank is connected to the vacuum pump; the asphalt working tank is used to receive liquid asphalt for impregnation, the liquid asphalt enters the impregnation tank after being pressurized by the asphalt booster pump, and the excess liquid asphalt in the impregnation tank returns from the impregnation tank to the asphalt working tank through the asphalt return pump; alternatively, liquid asphalt enters the booster tank from the impregnation tank and returns from the booster tank to the impregnation tank; the impregnation tank, booster tank and vacuum tank are connected and then evacuated by a vacuum pump.

2. A system for high-end graphite impregnation according to claim 1, characterized in that: The asphalt working tank is an outer coil pressure vessel, and heat transfer oil is introduced into the outer coil of the outer coil pressure vessel for heat preservation. The pressure vessel of the asphalt working tank is pressurized by injecting low-pressure nitrogen.

3. A system for high-end graphite impregnation according to claim 2, characterized in that: The impregnation tank is an outer coil quick-opening door type pressure vessel, in which the outer coil of the outer coil quick-opening door type pressure vessel is introduced with heat transfer oil for heat preservation or cooling, one end of the impregnation tank is a quick-opening door structure, and the quick-opening door is opened to realize the loading or unloading of the impregnated product; the impregnation tank is pressurized by injecting high-pressure nitrogen into the booster tank.

4. A system for high-end graphite impregnation according to claim 3, characterized in that: The working pressure of the asphalt working tank is from normal pressure to 0.5MPa, and the working temperature is 200-250℃; the working pressure of the impregnation tank is 3kPa-4.5MPa, and the working temperature is from normal temperature to 250℃; the working pressure of the booster tank is 3kPa-4.5MPa, and the working temperature is from normal temperature to 250℃; the working pressure of the vacuum tank is 3kPa-101kPa, and the working temperature is from normal temperature to 250℃.

5. A system for high-end graphite impregnation according to claim 4, characterized in that: The temperature of the heat transfer oil in the outer coil pipe passing into the outer coil pipe pressure vessel is 260°C-280°C.

6. A system for impregnation of high-end graphite according to claim 5, characterized in that: The pressure of the low-pressure nitrogen gas injected into the pressure vessel of the asphalt working tank is 0.6MPa-0.8MPa.

7. A system for impregnation of high-end graphite according to claim 6, characterized in that: The temperature of the heat transfer oil in the outer coil pipe of the outer coil pipe quick-opening door pressure vessel is 80°C-280°C.

8. A system for impregnation of high-end graphite according to claim 7, characterized in that: The pressure of the impregnation tank is 4.5MPa-5.0MPa by injecting high-pressure nitrogen into the booster tank.

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