Constant-temperature and constant-pressure lubrication sealing system

Abstract

The utility model discloses a constant-temperature and constant-pressure lubrication sealing system which comprises a reaction kettle, a shaft seal is arranged on the reaction kettle, a first loop is arranged between a lubricating oil storage tank and the shaft seal, a second loop is arranged between a sealing liquid storage tank and the shaft seal, and pressure sensors and backflow adjusting valves are arranged on the first loop and the second loop respectively. The separation tower is connected with the reaction kettle, the air cooler and the separation tower are connected with the condensate storage tank, the condensate storage tank is provided with a first pipeline, a second pipeline and a third pipeline, the first pipeline is provided with a first heating coil connected with the lubricating oil storage tank, and the second pipeline is provided with a second heating coil connected with the sealing liquid storage tank. The first pipeline and the second pipeline are respectively provided with a waste water adjusting valve, and the lubricating oil storage tank and the sealing liquid storage tank are respectively provided with a temperature sensor. According to the utility model, constant-temperature and constant-pressure continuous guarantee is provided for lubrication and sealing of the shaft seal of the reaction kettle, so that condensation polymerization can be normally and stably carried out, and the reaction safety is improved.

Description

Technical Field

[0001] This utility model relates to the field of polycondensation reaction technology in the polyester industry, and in particular to a constant temperature and pressure lubrication and sealing system. Background Technology

[0002] In polyester production, the polycondensation reaction stage is the most critical stage. This stage requires the reaction to take place under vacuum and high temperature. If the drive shaft seal leaks during the reaction, it can affect the viscosity of the product. If a large amount of air enters the high-temperature environment, the oxygen can come into contact with the high-temperature vapors of aldehydes, ethers, ethylene glycol, etc. in the reactor, which can easily lead to an explosion. Therefore, the reliability of the reactor shaft seal is crucial to the safe and stable production of the unit. It is necessary to provide continuous protection of constant temperature and pressure for the reactor shaft seal lubrication and sealing fluid to avoid the temperature and pressure instability of the lubricating and sealing fluid caused by changes in ambient temperature, which could cause displacement of the oil seal inside the shaft seal, leading to shaft seal leakage and production accidents. Utility Model Content

[0003] To address the aforementioned technical problems, the purpose of this utility model is to provide a constant temperature and pressure lubrication and sealing system that keeps the shaft seal of the reactor under stable temperature and pressure.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A constant-temperature and constant-pressure lubrication and sealing system includes a reaction vessel, a separation tower, an air cooler, a condensate storage tank, a plate heat exchanger, a circulating pump, a control cabinet, a lubricating oil storage tank, and a sealing fluid storage tank. The reaction vessel is equipped with a shaft seal. A first circuit for supplying lubricating oil is provided between the lubricating oil storage tank and the shaft seal. A second circuit for supplying sealing fluid is provided between the sealing fluid storage tank and the shaft seal. Both the first and second circuits are equipped with pressure sensors and reflux regulating valves. The control cabinet controls the flow rate of the reflux regulating valves based on the pressure detected by the pressure sensors. The separation tower is connected to the reaction vessel. The inlet of the air cooler is connected to the top of the separation tower, and the outlet of the air cooler is connected to... A condensate storage tank is connected to the wastewater treatment plant. The outlet of the condensate storage tank is equipped with a first pipe, a second pipe, and a third pipe. A first heating coil connected to a lubricating oil storage tank is installed on the first pipe, and a second heating coil connected to a sealing fluid storage tank is installed on the second pipe. Wastewater regulating valves are installed on the first and second pipes respectively. Temperature sensors are installed on the lubricating oil storage tank and the sealing fluid storage tank respectively. The control cabinet controls the flow rate of the wastewater regulating valves according to the temperature detected by the temperature sensors. A plate heat exchanger is connected to the outlet of the condensate storage tank, and a circulating pump is used to transport part of the cooling water in the plate heat exchanger back to the separation tower.

[0006] Preferably, the waste water regulating valve is opened when the detected temperature of the temperature sensor is lower than 50 DEG C, and is closed when the detected temperature of the temperature sensor is higher than 55 DEG C.

[0007] Preferably, the backflow regulating valve is closed when the detected pressure of the pressure sensor is lower than 0.1 MPa, and is opened when the detected pressure of the pressure sensor is higher than 0.2 MPa.

[0008] Preferably, a column tube heat exchanger is arranged on the first circuit and the second circuit respectively and connected with the tube side of the column tube heat exchanger, the shell side of the plate heat exchanger and the column tube heat exchanger forms a circuit, and an electromagnetic regulating valve is arranged on the circuit.

[0009] Preferably, the electromagnetic regulating valve is opened when the detected temperature of the temperature sensor is higher than 60 DEG C.

[0010] Preferably, a gear pump is arranged on the first circuit and the second circuit respectively.

[0011] Preferably, the lubricating oil in the first circuit enters from the top of the shaft seal and is discharged from the bottom, and the sealing liquid in the second circuit enters from the bottom of the shaft seal and is discharged from the top.

[0012] Compared with the prior art, the utility model has the following advantages due to the use of the above technical scheme:

[0013] The utility model discloses a constant temperature constant pressure's lubrication sealing system includes the reaction kettle, the separation tower, the air cooler, the condensate storage tank, the plate heat exchanger, the circulating pump, the control cabinet, the lubricating oil storage tank and the sealing liquid storage tank are provided with the shaft seal on the reaction kettle, and the first loop of conveying lubricating oil is set up between the lubricating oil storage tank and the shaft seal, and the second loop of conveying sealing liquid is set up between the sealing liquid storage tank and the shaft seal, and the pressure sensor and the backflow regulating valve are all set up on the first loop and the second loop, and the control cabinet controls the flow of backflow regulating valve according to the detection pressure of pressure sensor, makes lubricating oil and sealing liquid maintain in the constant pressure interval, the separation tower is connected with the reaction kettle, and the inlet of air cooler is connected with the top of separation tower, and the outlet of air cooler is connected with condensate storage tank, and the outlet of condensate storage tank is provided with first pipeline, second pipeline and third pipeline connected to sewage treatment station, and first heating coil connected with lubricating oil storage tank is set up on first pipeline, and second heating coil connected with sealing liquid storage tank is set up on second pipeline, and waste water regulating valve is set up on first pipeline and second pipeline respectively, and temperature sensor is set up on lubricating oil storage tank and sealing liquid storage tank respectively, and the control cabinet controls the flow of waste water regulating valve according to the detection temperature of temperature sensor, makes lubricating oil and sealing liquid maintain in the constant temperature interval, the utility model provides the constant temperature, constant pressure's sustainability guarantee for the reaction kettle shaft seal lubrication and sealing, avoids environmental temperature change to cause the temperature pressure of lubricating oil sealing liquid to be unstable and makes the oil seal inside shaft seal to appear the situation of displacement, makes the condensation reaction can be normal and smooth, guarantees the product quality, improves the security of reaction, avoids the production accident. BRIEF DESCRIPTION OF DRAWINGS

[0014] The utility model discloses constant temperature constant pressure's lubrication sealing system's schematic diagram.

[0015] ATTACHED Figure 1 The utility model discloses constant temperature constant pressure's lubrication sealing system's schematic diagram.

[0016] Among them: 1, reaction kettle;2, separation tower;3, air cooler;4, condensate storage tank;5, plate heat exchanger;6, circulating pump;7, control cabinet;8, lubricating oil storage tank;9, sealing liquid storage tank;10, shaft seal;11, pressure sensor;12, backflow regulating valve;13, first heating coil;14, second heating coil;15, waste water regulating valve;16, temperature sensor;17, tube heat exchanger;18, electromagnetic regulating valve;19, gear pump. DETAILED DESCRIPTION

[0017] The utility model discloses constant temperature constant pressure's lubrication sealing system's schematic diagram.

[0018] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0019] As attached Figure 1 The diagram shows the constant temperature and pressure lubrication and sealing system of this invention, comprising a reaction vessel 1, a separation tower 2, an air cooler 3, a condensate storage tank 4, a plate heat exchanger 5, a circulating pump 6, a control cabinet 7, a lubricating oil storage tank 8, and a sealing fluid storage tank 9. Purified terephthalic acid and ethylene glycol undergo an esterification reaction in the reaction vessel 1. The reaction vessel 1 has a shaft seal 10. A first circuit for supplying lubricating oil is formed between the lubricating oil storage tank 8 and the shaft seal 10. A second circuit for supplying sealing fluid is formed between the sealing fluid storage tank 9 and the shaft seal 10, providing lubrication and sealing to the shaft seal 10 and preventing leakage. Gear pumps 19 are installed on the first and second circuits respectively to drive the flow of lubricating oil and sealing fluid. Pressure sensors 11 and reflux regulating valves 12 are installed on both the first and second circuits. The control cabinet 7 controls the flow rate of the reflux regulating valve 12 according to the pressure detected by the pressure sensor 11. When the pressure detected by the pressure sensor 11 is lower than 0.1MPa, the reflux regulating valve 12 is closed. When the pressure detected by the pressure sensor 11 is higher than 0.2MPa, the reflux regulating valve 12 is opened, so that the lubricating oil and sealing fluid are maintained within a constant pressure range.

[0020] The separation tower 2 is connected with the reaction kettle 1, a large amount of ethylene glycol steam and water vapor generated after the purified terephthalic acid and ethylene glycol react in the reaction kettle 1 enters the separation tower 2 through a gas phase pipeline, the ethylene glycol steam and water vapor are cooled by the circulating water inputted into the separation tower 2 by the circulating pump 6, and the ethylene glycol steam and water vapor are cooled due to the different boiling points of the ethylene glycol and water, the boiling point of the ethylene glycol is 197.4℃, and the boiling point of the water is 100℃, when the circulating water enters the separation tower, the mixed steam is cooled to 120-150℃, the ethylene glycol condensate is discharged from the bottom of the separation tower 2 and recycled, and the water vapor rises to the top of the tower. The inlet of the air cooler 3 is connected with the top of the separation tower 2, the outlet of the air cooler 3 is connected with the condensate storage tank 4, the water vapor enters the air cooler 3 through the top of the separation tower 2 and is cooled, the cooled water vapor becomes condensate and enters the condensate storage tank 4, at this time, the temperature of the waste heat water in the condensate storage tank 4 is 80-85℃, and the waste heat water is discharged through the bottom of the condensate storage tank 4. The bottom outlet of the condensate storage tank 4 is provided with a first pipeline, a second pipeline and a third pipeline connected with a sewage treatment station, the first pipeline is provided with a first heating coil 13 connected with a lubricating oil storage tank 8, the second pipeline is provided with a second heating coil 14 connected with a sealing liquid storage tank 9, the first pipeline and the second pipeline are respectively provided with a waste water regulating valve 15, the lubricating oil storage tank 8 and the sealing liquid storage tank 9 are respectively provided with a temperature sensor 16, and the control cabinet 7 controls the flow of the waste water regulating valve 15 according to the detection temperature of the temperature sensor 16. When the detection temperature of the temperature sensor 16 is lower than 50℃, the waste water regulating valve 15 is opened, the heat of the waste heat water is conducted to the lubricating oil storage tank 8 and the sealing liquid storage tank 9 through the first heating coil 13 and the second heating coil 14, when the detection temperature of the temperature sensor 16 is higher than 55℃, the waste water regulating valve 15 is closed, and the waste heat water directly enters the sewage treatment station through the third pipeline.

[0021] The plate heat exchanger 5 is connected with the outlet of the condensate storage tank 4, the waste heat water in the condensate storage tank 4 is cooled into cooling water after entering the plate heat exchanger 5, and part of the cooling water in the plate heat exchanger 5 is sent back to the separation tower 2 by the circulating pump 6, so that the water is recycled. The first circuit and the second circuit are respectively provided with a tube heat exchanger 17, the first circuit and the second circuit are connected with the tube side of the tube heat exchanger 17, the shell side of the plate heat exchanger 5 and the tube heat exchanger 17 forms a circuit, and the circuit is provided with an electromagnetic regulating valve 18, when the ambient temperature rises and the detection temperature of the temperature sensor 16 is higher than 60℃, the electromagnetic regulating valve 18 is opened, so that the cooling water flowing out of the plate heat exchanger 5 cools the lubricating oil and the sealing liquid passing through the tube heat exchanger 17, and the temperature of the lubricating oil and the sealing liquid is ensured to be 50-55℃.

[0022] In order to ensure the lubricating sealing stability of the shaft seal 10, the lubricating oil in the first circuit enters from the top of the shaft seal 10 and is discharged from the bottom, and the sealing liquid in the second circuit enters from the bottom of the shaft seal 10 and is discharged from the top.

[0023] The utility model constant temperature constant pressure's lubrication sealing system has solved the problem of shortening of service life of the reaction kettle shaft seal caused by unstable temperature and pressure of the lubrication sealing system, effectively avoided the situation of overhigh temperature of the sealing liquid and damage of the oil seal in the reaction kettle shaft seal caused by untimely personnel inspection when using steam heating in winter, ensured normal progress of the polycondensation reaction and improved safety.

[0024] The above is only the embodiment of the utility model, and does not limit the patent range of the utility model, and equivalent structure or equivalent process transformation using the utility model specification content, or direct or indirect application in other related technical fields, are also included in the patent protection range of the utility model.

Claims

1. A constant temperature and constant pressure lubrication sealed system, characterized by: The utility model relates to a kind of integrated lubricating oil and sealing fluid circulation system, including reaction kettle, separation tower, air cooler, condensate tank, plate heat exchanger, circulating pump, control cabinet, lubricating oil tank and sealing fluid tank, shaft seal is provided on the reaction kettle, first loop for conveying lubricating oil is provided between the lubricating oil tank and shaft seal, second loop for conveying sealing fluid is provided between the sealing fluid tank and shaft seal, pressure sensor and backflow regulating valve are provided on the first loop and the second loop, and the control cabinet controls the flow of backflow regulating valve according to the pressure of pressure sensor detection;The separation tower is connected with the reaction kettle, the inlet of air cooler is connected with the top of separation tower, the outlet of air cooler is connected with condensate tank, the outlet of condensate tank is provided with first pipeline, second pipeline and third pipeline connected to sewage treatment station, first heating coil connected with lubricating oil tank is provided on the first pipeline, second heating coil connected with sealing fluid tank is provided on the second pipeline, waste water regulating valve is respectively provided on the first pipeline and the second pipeline, temperature sensor is respectively provided on the lubricating oil tank and the sealing fluid tank, and the control cabinet controls the flow of waste water regulating valve according to the temperature of temperature sensor detection;Plate heat exchanger is connected with the outlet of condensate tank, and circulating pump is used to convey part of cooling water in plate heat exchanger back to separation tower.

2. The constant temperature and pressure lubricated seal system of claim 1, wherein: When the temperature of temperature sensor detection is lower than 50 DEG C, the waste water regulating valve opens, and when the temperature of temperature sensor detection is higher than 55 DEG C, the waste water regulating valve closes.

3. The constant temperature and pressure lubricated seal system of claim 1, wherein: When the pressure of pressure sensor detection is lower than 0.1MPa, the backflow regulating valve closes, and when the pressure of pressure sensor detection is higher than 0.2MPa, the backflow regulating valve opens.

4. The constant temperature and pressure lubricated seal system of claim 1, wherein: Tube heat exchanger is respectively provided on the first loop and the second loop and connected with its tube side, and the shell side of plate heat exchanger and tube heat exchanger forms a circuit, and electromagnetic regulating valve is provided on the circuit.

5. The constant temperature and pressure lubricated seal system of claim 4, wherein: When the temperature of temperature sensor detection is higher than 60 DEG C, the electromagnetic regulating valve opens.

6. The constant temperature and pressure lubricated seal system of claim 1, wherein: Gear pump is respectively provided on the first loop and the second loop.

7. The constant temperature and pressure lubricated seal system of claim 1, wherein: Lubricating oil in the first loop enters from the top of shaft seal and discharges from the bottom, and sealing fluid in the second loop enters from the bottom of shaft seal and discharges from the top.

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