Special graphite impregnation system

Abstract

The utility model relates to the technical field of graphite manufacturing, in particular to a special graphite impregnation system. The impregnant tank is used for storing an impregnant; the impregnant tank is communicated with the impregnating tank; an overflow pipe is arranged at the upper part of the impregnant tank; the pipe top elevation of the overflow pipe is flush with the highest safe liquid level of the dipping tank; the impregnating tank is communicated with a feeding hole of the impregnant tank; the impregnant pump is communicated with the impregnating tank; the vacuum maintaining tank is communicated with a gas phase outlet of the impregnating tank; the flue gas cooling tank is communicated with the vacuum maintaining tank; the flue gas filtering tank is communicated with the flue gas cooling tank; the vacuum unit is communicated with the flue gas filtering tank; the flash evaporation solvent tank is respectively communicated with the vacuum maintaining tank and the flue gas cooling tank and is used for recovering flash evaporation solvents in the flash evaporation solvent tank and the vacuum maintaining tank; a liquid outlet of the flash solvent tank is communicated with the impregnating tank and is used for providing a flash solvent for the impregnating tank. According to the utility model, the weight gain rate of impregnated products can be increased, the flexibility of liquid level control is improved, and the safety of impregnation is improved.

Description

Technical Field

[0001] This utility model relates to the field of graphite manufacturing technology, and in particular to a special graphite impregnation system. Background Technology

[0002] Specialty graphite ("high-strength, high-density, and high-purity graphite") is widely used in metallurgy, chemical industry, aerospace and other fields due to its high strength, high density, and high purity. Its preparation process requires an impregnation process to penetrate liquid impregnating agents (such as bitumen) into the pores of the graphite to improve its density and performance.

[0003] Impregnation is a process in which certain liquid materials (impregnating agents) are allowed to penetrate into the pores of a product under specific temperature and pressure conditions, thereby reducing product porosity, increasing product density, and improving product quality. Current technology involves directly adding the impregnating agent to the impregnation tank, resulting in a low weight gain rate. Furthermore, the existing technology uses a float-type liquid level switch for liquid level control, which has poor reaction flexibility and is prone to causing "asphalt runoff" accidents. Utility Model Content

[0004] In view of this, the present invention provides a special graphite impregnation system, the main purpose of which is to improve the weight gain rate of impregnated products, improve the accuracy and flexibility of liquid level control, and enhance the safety of impregnation.

[0005] To achieve the above objectives, this utility model mainly provides the following technical solutions:

[0006] An embodiment of this utility model provides a special graphite impregnation system, including: an impregnation tank, an impregnating agent tank, an impregnating agent pump, a flash solvent tank, a vacuum holding tank, a flue gas cooling tank, a flue gas filter tank, an impregnating agent pump, and a vacuum unit;

[0007] The impregnation tank is used for impregnating graphite products; the impregnation tank has a material flow port one for the flow of deionized water, protective gas and flash solvent; the bottom of the impregnation tank has a material flow port two for the flow of impregnating agent.

[0008] The impregnation tank is equipped with a heat exchange device for heating, cooling and heat preservation of the impregnation tank;

[0009] The impregnating agent tank is used to store the impregnating agent; a heating device is provided on the impregnating agent tank; the impregnating agent tank is connected to the impregnating tank and is used to supply the impregnating agent to the impregnating tank; an overflow pipe is provided at the top of the impregnating agent tank; the top elevation of the overflow pipe is level with the highest safe liquid level of the impregnating tank; the material flow port is connected to the feed port of the impregnating agent tank;

[0010] The outlet of the impregnating agent pump is connected to the impregnation tank for circulating the impregnating agent in the impregnation tank; the outlet of the impregnating agent pump is also connected to the impregnating agent tank for recovering the impregnating agent.

[0011] The vacuum holding tank is connected to the gas phase outlet of the impregnation tank;

[0012] The flue gas cooling tank is connected to the vacuum holding tank;

[0013] The flue gas filter canister is connected to the flue gas cooling canister;

[0014] The vacuum unit is connected to the flue gas filter canister and is used to create negative pressure suction on the impregnation canister.

[0015] The flash solvent tank is connected to the vacuum holding tank and the flue gas cooling tank respectively, and is used to recover the flash solvent in the flash solvent tank and the vacuum holding tank; the outlet of the flash solvent tank is connected to the impregnation tank, and is used to supply flash solvent to the impregnation tank;

[0016] The flash solvent tank is equipped with a second heating device.

[0017] Furthermore, a deionized water pipe is connected to the material flow port for the input of deionized water;

[0018] A protective air pipe is connected to the material flow port for the input of protective air;

[0019] The impregnating agent tank has an inlet connected to an impregnating agent pipe for inputting the impregnating agent;

[0020] The flash solvent tank is connected to a flash solvent pipe at its inlet.

[0021] Furthermore, it also includes: exhaust pipes;

[0022] The exhaust pipe is connected to the impregnating agent tank, the impregnation tank, the flash solvent tank, the flue gas cooling tank, the flue gas filter tank, and the gas phase outlet of the vacuum unit through multiple exhaust pipes.

[0023] Furthermore, it also includes: waste liquid pipes;

[0024] The waste liquid pipe is connected to the drain ports of the vacuum holding tank and the flue gas cooling tank, respectively.

[0025] Furthermore, it also includes: wastewater pipes;

[0026] The wastewater pipe is connected to the material flow port.

[0027] Furthermore, it also includes: an impregnating agent recovery pipe;

[0028] The impregnating agent recovery pipe is connected to the output end of the impregnating agent pump and the material flow port 2, respectively.

[0029] Furthermore, pressure gauges are installed on the impregnating agent tube, the deionized water tube, the flash solvent tube, the protective gas tube, the waste gas tube, the waste liquid tube, and the wastewater tube;

[0030] Flow meters are installed at the outlets of the impregnating agent pipe, the deionized water pipe, the flash solvent pipe, the protective gas pipe, the impregnating agent recovery pipe, and the impregnating agent pump.

[0031] Thermometers are installed on the impregnating agent tube, the deionized water tube, the flash solvent tube, the protective gas tube, the waste gas tube, and the waste liquid tube.

[0032] Furthermore, level gauges are installed on the impregnation tank, the impregnation agent tank, the flash solvent tank, the vacuum holding tank, and the flue gas cooling tank;

[0033] Pressure gauges are installed at the outlets of the impregnation tank, the impregnating agent tank, the flash solvent tank, the vacuum holding tank, the flue gas cooling tank, the flue gas filter tank, the vacuum unit, and the impregnating agent pump.

[0034] Furthermore, thermometers are installed on the impregnation tank, the impregnating agent tank, the flash solvent tank, the vacuum holding tank, the flue gas cooling tank, the flue gas filter tank, the impregnating agent pump, and the vacuum unit.

[0035] By employing the above technical solution, the special graphite impregnation system of this utility model has at least the following advantages:

[0036] It can improve the weight gain rate of impregnated products, enhance the accuracy and flexibility of liquid level control, and improve the safety of impregnation.

[0037] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of a special graphite impregnation system provided for an embodiment of the present invention.

[0039] As shown in the figure:

[0040] 1 is the impregnation tank, 2 is the impregnation agent tank, 3 is the flash solvent tank, 4 is the vacuum holding tank, 5 is the flue gas cooling tank, 6 is the flue gas filter tank, 7 is the impregnation agent pump, 8 is the vacuum unit, 10 is the impregnation agent pipe, 11 is the impregnation agent overflow pipe, 12 is the impregnation agent recovery pipe, 20 is the deionized water pipe, 21 is the wastewater pipe, 30 is the flash solvent pipe, 31 is the flash solvent recovery pipe, 40 is the protective gas pipe, 50 is the waste gas pipe, 60 is the waste liquid pipe, 101 is valve one, 102 is valve two, 103 is valve three, 104 is valve four, 105 is valve five, 106 is valve six, 107 is valve seven, 108 is valve 8. 109 is valve 9, 110 is valve 10, 111 is valve 11, 201 is valve 12, 202 is valve 13, 301 is valve 14, 302 is valve 15, 303 is valve 16, 401 is valve 17, 501 is valve 18, 502 is valve 19, 503 is valve 20, 504 is valve 21, 505 is valve 22, 506 is valve 23, 507 is valve 24, 508 is valve 25, 509 is valve 26, 510 is valve 27, 601 is valve 28, 602 is valve 29, and 603 is valve 30. Detailed Implementation

[0041] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the specific implementation methods, structures, features, and effects according to this utility model application are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "embodiments" or "embodiments" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0042] like Figure 1 As shown, an embodiment of this utility model discloses a special graphite impregnation system, comprising: an impregnation tank 1, an impregnating agent tank 2, an impregnating agent pump 7, a flash solvent tank 3, a vacuum holding tank 4, a flue gas cooling tank 5, a flue gas filtering tank 6, and a vacuum unit 8; the impregnation tank 1 is used to impregnate graphite products; the impregnation tank 1 has a material flow port one for the flow of deionized water, protective gas, and flash solvent; the material flow port one can be one or more for material entry. The bottom of the impregnation tank 1 has a material flow port two for the flow of impregnating agent, allowing the impregnating agent to flow in or out through the material flow port two; the impregnating agent can flow from the impregnating agent tank 2 into the impregnation tank 1. The impregnation tank 1 is equipped with a heat exchange device for heating, cooling, and heat preservation of the impregnation tank 1, which can be controlled according to the needs of the process.

[0043] Impregnating agent tank 2 is used to store impregnating agent; impregnating agent tank 2 is equipped with heating device 1 to heat and keep the impregnating agent warm; impregnating agent tank 2 is connected to impregnating tank 1 and is used to supply impregnating agent to impregnating tank 1; valve 3 103 and valve 4 104 are installed on the pipeline connecting impregnating agent tank 2 and impregnating tank 1.

[0044] An overflow pipe 11 is installed at the top of the impregnating agent tank 2; the top elevation of the overflow pipe 11 is level with the highest safe liquid level of the impregnating agent tank 1; this allows impregnating agent exceeding the highest safe liquid level to be discharged through the overflow pipe 11 when impregnating agent is injected into the impregnating agent tank 1, solving the problem of "asphalt spillage" accidents caused by the inflexible liquid level control in the tank currently common in the industry, which relies on float-type liquid level switches. Overflow impregnating agent that needs to be discharged during production is discharged through the overflow pipe 11. A valve 110 is installed on the pipeline connecting the overflow pipe 11 and the impregnating agent tank 2; the material flow port 2 is connected to the feed port of the impregnating agent tank 2.

[0045] The outlet of the impregnating agent pump 7 is connected to the impregnation tank 1 for circulating or discharging the impregnating agent in the impregnation tank 1; the outlet of the impregnating agent pump 7 is connected to the impregnating agent tank 2 for the recovery of the impregnating agent; valves 105 and 104 are installed on the pipeline connecting the impregnation tank 1 and the inlet of the impregnating agent pump 7; valves 106 and 107 are installed on the pipeline connecting the impregnation tank 1 and the outlet of the impregnating agent pump 7; valves 102 and 108 are installed on the pipeline connecting the impregnating agent tank 2 and the outlet of the impregnating agent pump 7.

[0046] Vacuum holding tank 4 is connected to the gas phase outlet of impregnation tank 1; valve 22 505 and valve 18 501 are installed on the pipeline connecting vacuum holding tank 4 and impregnation tank 1;

[0047] The flue gas cooling tank 5 is connected to the vacuum holding tank 4; a valve 23 506 is installed on the pipeline connecting the flue gas cooling tank 5 and the vacuum holding tank 4; the flue gas filter tank 6 is connected to the flue gas cooling tank 5; a valve 25 508 is installed on the pipeline connecting the flue gas filter tank 6 and the flue gas cooling tank 5; the vacuum unit 8 is connected to the flue gas filter tank 6 and is used to create negative pressure suction for the impregnation tank 1; a valve 26 509 is installed on the pipeline connecting the inlet of the vacuum unit 8 and the flue gas filter tank 6.

[0048] The flash solvent tank 3 is connected to the vacuum holding tank 4 and the flue gas cooling tank 5 respectively, for recovering the flash solvent in the flash solvent tank 3 and the vacuum holding tank 4; the outlet of the flash solvent tank 3 is connected to the impregnation tank 1, for supplying the flash solvent to the impregnation tank 1; valves sixteen 303 and seven 107 are installed on the pipeline connecting the flash solvent tank 3 and the impregnation tank 1; the flash solvent tank 3 is connected to the vacuum holding tank 4 and the flue gas cooling tank 5 respectively through the flash solvent recovery pipe 31. The flash solvent that needs to be recovered in production is recovered through the flash solvent recovery pipe 31. Valve fifteen 302 is installed on the pipeline connecting the flash solvent recovery pipe 31 to the flash solvent tank 3, and valve twenty-eight 601 is installed on the pipeline connecting the flash solvent recovery pipe 31 to the vacuum holding tank 4; a heating device two is installed on the flash solvent tank 3 for heating the flash solvent.

[0049] An embodiment of this utility model proposes a special graphite impregnation system that, through flash evaporation, can improve the weight gain rate of the impregnated product and reduce the loss of impregnating agent. By using an overflow pipe 11 for the impregnating agent with the top elevation level of the pipe level being equal to the highest safe liquid level in the impregnation tank 1, the accuracy and flexibility of liquid level control are improved, and the safety of impregnation is enhanced.

[0050] As a preferred embodiment of the above embodiment, a deionized water pipe 20 is connected to the material flow port 1 for inputting deionized water; the deionized water required for production is supplied through the deionized water pipe 20, and valves 12 201 and 107 are installed on the pipeline connecting the deionized water pipe 20 and the impregnation tank 1; this facilitates the adjustment of the deionized water.

[0051] A protective gas pipe 40 is connected to the material flow port for inputting protective gas. The protective gas required for production is supplied through the protective gas pipe 40. Valves 17 401 and 107 are installed on the pipeline connecting the protective gas pipe 40 and the impregnation tank 1 to facilitate the adjustment and control of the protective gas.

[0052] The inlet of the impregnating agent tank 2 is connected to an impregnating agent pipe 10 for the input of impregnating agent; the impregnating agent required for production is supplied through the impregnating agent pipe 10. Valves 101 and 102 are installed on the pipeline connecting the impregnating agent pipe 10 and the impregnating agent tank 2 to facilitate the adjustment and control of the impregnating agent.

[0053] The inlet of the flash solvent tank 3 is connected to the flash solvent pipe 30. The flash solvent required for production is supplied through the flash solvent pipe 30. Valves 14 301 and 15 302 are installed on the pipeline connecting the flash solvent pipe 30 and the flash solvent tank 3 to facilitate the adjustment and control of the flash solvent.

[0054] As a preferred embodiment of the above embodiments, one embodiment of the present invention provides a special graphite impregnation system, which further includes: an exhaust pipe 50; the exhaust pipe 50 is connected to the gas phase outlets of the impregnating agent tank 2, the impregnation tank 1, the flash solvent tank 3, the flue gas cooling tank 5, the flue gas filter tank 6, and the vacuum unit 8 through multiple exhaust pipes. Waste gas requiring external discharge during production is discharged through the exhaust pipe 50. Valves 18 501 and 21 504 are installed on the pipe connecting the exhaust pipe 50 to the impregnating tank 1; valve 19 502 is installed on the pipe connecting the exhaust pipe 50 to the impregnating agent tank 2; valve 20 503 is installed on the pipe connecting the exhaust pipe 50 to the flash solvent tank 3; valve 24 507 is installed on the pipe connecting the exhaust pipe 50 to the flue gas cooling tank 5; and valve 27 510 is installed on the pipe connecting the exhaust pipe 50 to the outlet of the vacuum unit 8, enabling convenient control of waste gas emissions.

[0055] As a preferred embodiment of the above embodiments, one embodiment of the present invention provides a special graphite impregnation system, which further includes: a waste liquid pipe 60; the waste liquid pipe 60 is connected to the drain ports of the vacuum holding tank 4 and the flue gas cooling tank 5 respectively. Waste liquid that needs to be discharged externally during production is discharged through the waste liquid pipe 60. Valves 28 601 and 30 603 are installed on the pipeline connecting the waste liquid pipe 60 and the vacuum holding tank 4; valves 29 602 and 30 603 are installed on the pipeline connecting the waste liquid pipe 60 and the flue gas cooling tank 5; the discharge of waste liquid can be controlled.

[0056] As a preferred embodiment of the above embodiments, one embodiment of the present invention provides a special graphite impregnation system, which further includes: a wastewater pipe 21; the wastewater pipe 21 is connected to a material flow port 2. Wastewater that needs to be discharged during production is discharged through the wastewater pipe 21. Valves 13 202 and 4 104 are installed on the pipeline connecting the wastewater pipe 21 and the impregnation tank 1 to control the discharge of wastewater.

[0057] As a preferred embodiment of the above embodiments, one embodiment of the present invention provides a special graphite impregnation system, which further includes: an impregnating agent recovery pipe 12; the impregnating agent recovery pipe 12 is connected to the output end of the impregnating agent pump 7 and the material flow port 2, respectively. The impregnating agent that needs to be recovered during production is recovered through the impregnating agent recovery pipe 12. Valves 8 108 and 9 109 are installed on the pipeline connecting the impregnating agent recovery pipe 12 and the outlet of the impregnating agent pump 7, and valves 111, 4 104 and 9 109 are installed on the pipeline connecting the impregnating agent recovery pipe 12 and the impregnation tank 1; this facilitates the control of impregnating agent recovery.

[0058] As a preferred embodiment of the above, pressure gauges are installed on the impregnating agent pipe 10, deionized water pipe 20, flash solvent pipe 30, protective gas pipe 40, waste gas pipe 50, waste liquid pipe 60 and wastewater pipe 21 for pressure monitoring.

[0059] Flow meters are installed at the outlets of the impregnating agent pipe 10, deionized water pipe 20, flash solvent pipe 30, protective gas pipe 40, impregnating agent recovery pipe 12, and impregnating agent pump 7 for flow monitoring.

[0060] Thermometers are installed on the impregnating agent tube 10, deionized water tube 20, flash solvent tube 30, protective gas tube 40, waste gas tube 50 and waste liquid tube 60 for temperature detection.

[0061] As a preferred embodiment of the above, level gauges are installed on the impregnation tank 1, the impregnation agent tank 2, the flash solvent tank 3, the vacuum holding tank 4, and the flue gas cooling tank 5 for level monitoring.

[0062] Pressure gauges are installed at the outlets of impregnation tank 1, impregnating agent tank 2, flash solvent tank 3, vacuum holding tank 4, flue gas cooling tank 5, flue gas filter tank 6, vacuum unit 8, and impregnating agent pump 7 for pressure monitoring.

[0063] As a preferred embodiment of the above, thermometers are installed on the impregnation tank 1, impregnating agent tank 2, flash solvent tank 3, vacuum holding tank 4, flue gas cooling tank 5, flue gas filter tank 6, impregnating agent pump 7, and vacuum unit 8 for temperature measurement.

[0064] Detailed instructions for the operation:

[0065] Preparation and preheating: Open valves 19 (502), 10 (110), 2 (102), and 1 (101) in sequence. The impregnating agent is injected into the impregnating agent tank 2 through the impregnating agent pipe 10. The gas in the impregnating agent tank 2 is discharged through the exhaust pipe 50. When impregnating agent overflows from the impregnating agent overflow pipe 11, close valves 1 (101) and 2 (102) in sequence to stop the impregnating agent feeding.

[0066] Open valves 20503, 15302, and 14301 in sequence. Flash solvent is injected into flash solvent tank 3 through flash solvent pipe 30. Gas in flash solvent tank 3 is discharged through waste gas pipe 50. When the liquid level in flash solvent tank 3 reaches the liquid level target set by the process, close valves 14301 and 15302 in sequence to stop the flash solvent feeding.

[0067] The special graphite product is placed in impregnation tank 1 for preheating.

[0068] Gas replacement: Open valves 18 (501), 22 (505), 23 (506), and 25 (508) in sequence to activate vacuum holding tank 4 and flue gas cooling tank 5.

[0069] Once the preheating reaches the temperature set by the process, open valve 27510, start vacuum unit 8, open valve 26509, activate flue gas filter 6, and perform the first vacuuming of impregnation tank 1. The exhaust gas from the outlet of vacuum unit 8 is discharged through exhaust pipe 50. After the vacuum level is reached according to the process settings, close valve 27510, shut down vacuum unit 8, and then close valves 26509 and 18501 in sequence to complete the first vacuuming operation.

[0070] Open valves 17401 and 107 in sequence, and the protective gas is introduced into the impregnation tank 1 through the protective gas pipe 40. When the pressure in the impregnation tank 1 rises to the pressure index set by the process, close valves 17401 and 107 in sequence to stop the supply of protective gas.

[0071] Open valves 18 (501) and 24 (507) in sequence to allow the waste gas in impregnation tank 1 to pass through vacuum holding tank 4 and flue gas cooling tank 5 in sequence, and then be discharged through waste gas pipe 50 to restore the pressure in impregnation tank 1 to normal pressure. Close valve 24 (507) to stop nitrogen replacement.

[0072] Open valve 27510, start vacuum unit 8, open valve 26509, and perform a second vacuuming of impregnation tank 1. Exhaust gas from vacuum unit 8 is discharged through exhaust pipe 50. Vacuuming is continued until the set vacuum level is reached. Then, close valve 27510, shut down vacuum unit 8, and sequentially close valves 26509, 25508, and 23506 to complete the second vacuuming operation. After maintaining constant temperature and pressure, the gas replacement operation is completed.

[0073] Cleaning: Open valve 12 201 and valve 7 107 in sequence, and inject deionized water into impregnation tank 1 through deionized water pipe 20 until the special graphite is submerged. Then close valve 12 201, valve 7 107 and valve 18 501 in sequence to stop the supply of deionized water and prepare to pressurize impregnation tank 1.

[0074] Open valves 17401 and 107 in sequence, and the protective gas is introduced into the immersion tank 1 through the protective gas pipe 40. When the pressure in the immersion tank 1 rises to the pressure index set by the process, close valves 17401 and 107 in sequence to stop the supply of protective gas and carry out the immersion operation.

[0075] When the soaking operation is completed, open valve 104 and valve 202 in sequence to drain the wastewater in the soaking tank 1 through the wastewater pipe 21. After draining the wastewater in the soaking tank 1, close valve 104 and valve 202 in sequence. Open valve 501, valve 506, and valve 507 in sequence to drain the waste gas in the soaking tank 1 through the vacuum holding tank 4 and the flue gas cooling tank 5, and then discharge it through the waste gas pipe 50. When the pressure in the soaking tank 1 drops to the pressure index set by the process, close valve 507 to complete the cleaning operation.

[0076] Unblocking the duct: Heat the impregnation tank 1 to the temperature set by the process, open valve 27 510, start vacuum unit 8, and open valves 26 509 and 25 508 in sequence to perform the third vacuuming of impregnation tank 1. The exhaust gas from the outlet of vacuum unit 8 is discharged through exhaust pipe 50. After the vacuum level is reached, close valve 27 510, shut down vacuum unit 8, and close valves 26 509 and 23 506 in sequence to complete the third vacuuming operation.

[0077] When completing the constant temperature and pressure holding operation at the pre-immersion temperature set by the process, open valves 24507, 29602 and 30603 in sequence, drain the waste liquid in the flue gas cooling tank 5 through the waste liquid pipe 60, and then close valves 29602, 30603 and 24507 in sequence.

[0078] Impregnation-flash evaporation: After completing the constant temperature and pressure holding operation, open valve 16 303 and valve 7 107 in sequence to inject flash evaporation solution with a temperature that meets the process setting parameters into impregnation tank 1 until the pressure in impregnation tank 1 rises back to the pressure setting parameters of the process. Then, close valve 7 107 and valve 16 303 in sequence to stop injecting flash evaporation solution.

[0079] Impregnation - Variable pressure impregnation: Open valves 24 (507), 23 (506), 3 (103), 4 (104), 2 (102), and 1 (101) in sequence to add impregnating agent to impregnation tank 1 at a temperature that meets the process setting parameters. During this process, maintain the pressure of impregnation tank 1 within the pressure range set by the process. When the level of impregnating agent submerging the special graphite reaches the level set by the process, close valves 1 (101), 2 (102), 3 (103), and 4 (104) in sequence.

[0080] During this operation, since the top elevation of the impregnating agent overflow pipe 11 in the impregnating agent tank 2 is level with the highest safe liquid level in the impregnating tank 1, when impregnating agent is injected into the impregnating tank 1, the impregnating agent exceeding the highest safe liquid level can be discharged through the impregnating agent overflow pipe 11. This solves the problem of "asphalt run" accidents caused by the inflexible liquid level control in the liquid level tank achieved by the float-type liquid level switch, which is common in the industry.

[0081] Open valve 15 302 and valve 28 601 in sequence to recover the flash solvent in the vacuum holding tank 4 to the flash solvent tank 3 through the flash solvent recovery pipe 31, and then close valve 28 601 and valve 15 302 in sequence.

[0082] Open valves 30603 and 29602 in sequence to drain the waste liquid in flue gas cooling tank 5 through waste liquid pipe 60, and then close valves 29602, 30603 and 24507 in sequence.

[0083] Open valve 27510, start vacuum unit 8, open valve 26509, and perform the fourth vacuuming of impregnation tank 1. The exhaust gas from the outlet of vacuum unit 8 is discharged through exhaust pipe 50. After the vacuum level is reached, close valve 27510, shut down vacuum unit 8, and then close valves 26509 and 25508 in sequence to complete the fourth vacuuming operation.

[0084] Open valves 4 (104), 5 (105), and 7 (107) in sequence, start impregnating agent pump 7, and open valve 6 (106) to establish impregnating agent circulation.

[0085] During the impregnation agent circulation, the pressure-changing impregnation process in impregnation tank 1 is carried out in a cyclical manner, from pressure increase to pressure decrease, with one pressure change per hour, and the number of pressure changes follows the process. The pressure increase operation is as follows: valves 18 (501) and 24 (507) are closed sequentially, valve 17 (401) is opened, protective gas enters impregnation tank 1, the pressure is increased to the pressure target set by the process, and then valve 17 (401) is closed. The pressure decrease operation is as follows: valves 24 (507) and 18 (501) are opened sequentially, the waste gas in impregnation tank 1 passes through vacuum holding tank 4 and flue gas cooling tank 5 sequentially, and is discharged through waste gas pipe 50, the pressure is decreased to the pressure target set by the process, and then valves 18 (501) and 24 (507) are closed sequentially.

[0086] When the pressure-switching impregnation process is completed, valves 24-507, 15-302, and 28-601 are opened in sequence to recover the flash solvent in the vacuum holding tank 4 to the flash solvent tank 3 through the flash solvent recovery pipe 31. Then, valves 28-601 and 15-302 are closed in sequence. Next, valves 30-603 and 29-602 are opened in sequence to drain the waste liquid in the flue gas cooling tank 5 through the waste liquid pipe 60. Finally, valves 29-602, 30-603, and 24-507 are closed.

[0087] Impregnation - Static Impregnation: After the pressure impregnation treatment is completed, close valve 6 106, shut down impregnating agent pump 7, and then close valve 5 105, valve 4 104 and valve 7 107 in sequence to stop the circulation of liquid impregnating agent.

[0088] Close valve 18 501, and open valves 17 401 and 7 107 in sequence to fill the impregnation tank 1 with protective gas. When the pressure inside the impregnation tank 1 rises to the pressure index set by the process, close valves 17 401 and 7 107 in sequence, and keep the temperature and pressure according to the process to complete the static impregnation operation.

[0089] Cooling: Turn off the heating of impregnation tank 1 and perform cooling operation on impregnation tank 1. When the temperature inside impregnation tank 1 drops to the temperature index set by the process, open valve 17 401 and valve 7 107 in sequence to fill impregnation tank 1 with protective gas and pressurize it to the pressure index set by the process. Then close valve 17 401 and valve 7 107 in sequence.

[0090] There are two methods for discharging and recovering the impregnating agent through the impregnating agent recovery pipe 12. One method is to use the impregnating agent pump 7, specifically: open valve 4 104, valve 5 105 and valve 9 109 in sequence, start the impregnating agent pump 7, open valve 8 108 to carry out the recovery operation, and when the impregnating agent recovery is completed, close valve 8 108, stop the impregnating agent pump 7, and close valve 5 105, valve 4 104 and valve 9 109 in sequence. The other method is to use the pressure inside the impregnation tank 1, specifically: open valve 4 104, valve 111 and valve 9 109 in sequence to carry out the recovery operation, and when the impregnating agent recovery is completed, close valve 4 104, valve 111 and valve 9 109 in sequence.

[0091] When the temperature inside the impregnation tank 1 drops to the temperature set by the process, valves 18501 and 21504 are opened in sequence to discharge the waste gas into the waste gas pipe 50 to release the pressure in the impregnation tank 1 and obtain the impregnated product.

[0092] To further clarify, while the terms "first," "second," etc., may be used herein to describe various elements, these terms should not limit the elements. These terms are used only to distinguish one element from another. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element; these terms are used only to distinguish one element from another. This does not depart from the scope of the exemplary embodiments. Similarly, "element one," "element two," and so on do not represent the order of elements; these terms are used only to distinguish one element from another. As used herein, the term "and / or" includes any and all combinations of one or more associated listed items.

[0093] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0094] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0095] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A special graphite impregnation system characterized by, It comprises: an impregnation tank, an impregnating agent tank, an impregnating agent pump, a flash solvent tank, a vacuum holding tank, a flue gas cooling tank, a flue gas filtering tank, an impregnating agent pump and a vacuum unit; The impregnation tank is used for impregnating graphite products; the impregnation tank is provided with a material flow passage one on the top for the flow of deionized water, protective gas and flash solvent; the bottom of the impregnation tank is provided with a material flow passage two for the flow of impregnating agent; The impregnation tank is provided with a heat exchange device for heating, cooling and heat preservation of the impregnation tank; The impregnating agent tank is used for storing impregnating agent; the impregnating agent tank is provided with a heating device one; the impregnating agent tank is communicated with the impregnation tank for providing impregnating agent to the impregnation tank; the upper part of the impregnating agent tank is provided with an overflow pipe; the top of the overflow pipe is leveled with the highest safe liquid level of the impregnation tank; the material flow passage two is communicated with the feed inlet of the impregnating agent tank; The outlet of the impregnating agent pump is communicated with the impregnation tank for circulating flow of the impregnating agent in the impregnation tank; the outlet of the impregnating agent pump is communicated with the impregnating agent tank for recycling of the impregnating agent; The vacuum holding tank is communicated with the gas phase outlet of the impregnation tank; The flue gas cooling tank is communicated with the vacuum holding tank; The flue gas filtering tank is communicated with the flue gas cooling tank; The vacuum unit is communicated with the flue gas filtering tank for forming negative pressure suction to the impregnation tank; The flash solvent tank is respectively communicated with the vacuum holding tank and the flue gas cooling tank for recycling of the flash solvent in the flash solvent tank and the vacuum holding tank; the liquid outlet of the flash solvent tank is communicated with the impregnation tank for providing flash solvent to the impregnation tank; The flash solvent tank is provided with a heating device two.

2. The special graphite impregnation system according to claim 1, wherein, The material flow passage one is connected with a deionized water pipe for input of deionized water; The material flow passage one is connected with a protective gas pipe for input of protective gas; The feed inlet of the impregnating agent tank is connected with an impregnating agent pipe for input of impregnating agent; The feed inlet of the flash solvent tank is connected with a flash solvent pipe.

3. The specialty graphite impregnation system of claim 2, wherein, Further comprising: A waste gas pipe; The waste gas pipe is respectively communicated with the gas phase outlets of the impregnating agent tank, the impregnation tank, the flash solvent tank, the flue gas cooling tank, the flue gas filtering tank and the vacuum unit through a plurality of exhaust pipes.

4. The specialty graphite impregnation system of claim 3, wherein, Further comprising: A waste liquid pipe; The waste liquid pipe is respectively communicated with the liquid outlets of the vacuum holding tank and the flue gas cooling tank.

5. The specialty graphite impregnation system of claim 4, wherein, Further comprising: A waste water pipe; The waste water pipe is communicated with the material flow passage two.

6. The specialty graphite impregnation system of claim 5, wherein, Further comprising: An impregnating agent recycling pipe; The impregnating agent recycling pipe is respectively communicated with the output end of the impregnating agent pump and the material flow passage two.

7. The special graphite impregnation system according to claim 6, wherein, Pressure gauges are installed on the impregnating agent pipe, the deionized water pipe, the flash solvent pipe, the protective gas pipe, the waste gas pipe, the waste liquid pipe and the waste water pipe; Flow meters are installed on the impregnating agent pipe, the deionized water pipe, the flash solvent pipe, the protective gas pipe, the impregnating agent recycling pipe and the outlet of the impregnating agent pump; A thermometer is arranged on the impregnant pipe, the deionized water pipe, the flash solvent pipe, the protective gas pipe, the waste gas pipe and the waste liquid pipe.

8. The special graphite impregnation system according to claim 7, characterized in that, A liquid level meter is arranged on the impregnation tank, the impregnant tank, the flash solvent tank, the vacuum holding tank and the flue gas cooling tank. A pressure gauge is arranged on the outlet of the impregnation tank, the impregnant tank, the flash solvent tank, the vacuum holding tank, the flue gas cooling tank, the flue gas filtering tank, the vacuum unit and the impregnant pump.

9. The special graphite impregnation system according to claim 8, characterized in that, A thermometer is arranged on the impregnation tank, the impregnant tank, the flash solvent tank, the vacuum holding tank, the flue gas cooling tank, the flue gas filtering tank, the impregnant pump and the vacuum unit.

Images