[0019] The following will be attached Figure 1-Figure 7 The present invention is described in detail, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
[0020] The present invention provides a mechanical seal control system for polyvinyl chloride bulk polymerization kettle through improvement, which is characterized in that: the control system is an integrated oil station control system, and one oil station provides both the pre-polymerization part and the polymerization part The mechanical seal liquid cycle provides pressure to glycerin at the same time, and a grease pump provides glycerin for the pre-polymerized mechanical seal and the polymerized bottom mechanical seal, and has an automatic grease supplement function.
[0021] The mechanical seal control system of the polyvinyl chloride bulk polymerizer is characterized in that: the oil station in the control system is divided into four independent outlets according to the equipment, and the scheme of two pumps and two motors is used for one open and one standby; Three ways: one way is the top mechanical seal liquid, the other way is the bottom mechanical seal liquid, and the other way is to the hydraulic cylinder to provide pressure for glycerin. After returning, it is filtered and cooled back to the fuel tank. The pressure of the sealing liquid is automatically adjusted by the pneumatic film pressure regulating valve of the circuit to keep the pressure difference between the pressure of the sealing liquid and the pressure in the kettle constant.
[0022] The mechanical seal control system of the polyvinyl chloride bulk polymerization kettle is characterized in that: the pre-polymerization part is a set of mechanical seals for one device, and the outlet of the oil station is divided into two paths, one path provides mechanical sealing liquid circulation, and the other provides glycerin Pressure; The polymerization part consists of three equipment, each equipment has two sets of top and bottom mechanical seals, the outlet of the oil station is divided into three independent outlets, and each independent outlet is divided into three channels, and the two channels provide one device with two sets of top and bottom The machine seals the sealing liquid circulation, all the way provides the machine seal glycerin pressure at the bottom of the equipment.
[0023] The mechanical seal control system of the polyvinyl chloride bulk polymerization kettle is characterized in that the oil route providing glycerin pressure is automatically adjusted by a pneumatic film pressure regulating valve to ensure that the pressure difference between the glycerin pressure and the pressure in the kettle is constant. When the amount is insufficient, the hydraulic cylinder prompts an alarm, and the grease pump automatically replenishes glycerin; the oil pressure for the circulation of the sealing liquid is automatically adjusted by the pneumatic film pressure regulating valve on the circuit to ensure that the pressure of the sealing liquid is equal to the pressure in the kettle. The pressure difference is constant.
[0024] The mechanical seal control system of the polyvinyl chloride bulk polymerization kettle is characterized in that an emergency stop reactant branch is added at the entrance of the glycerin into the mechanical seal, controlled by a solenoid valve, and the solenoid valve is automatically opened when there is a large amount of leakage. Stop the entry of reactants to prevent accidents.
[0025] The mechanical seal control system of the polyvinyl chloride bulk polymerizer is characterized in that the bottom mechanical seal has a material seal and a double-end spring mechanical seal, and nitrogen is passed between the material seal and the double spring mechanical seal. , To purge the leakage, enter the gas-liquid separation tank after purging, and then perform classification and recovery; the nitrogen inlet branch of the bottom mechanical seal is equipped with a solenoid valve and a filter pressure reducing valve; the nitrogen outlet is connected to the vapor-liquid separation tank.
[0026] figure 2 Medium (emergency branch), when an emergency occurs, the switch of the branch is controlled by the solenoid valve, and the terminator is injected through the glycerin pipeline.
[0027] image 3 In the middle, each polymerizer mechanical seal president is divided into three entrances, including glycerin route, nitrogen route, and sealing liquid route.
[0028] Figure 4 In the medium, the glycerin of the material seal is supplied by the grease pump, and the pressure is provided by the oil station through the hydraulic cylinder, and the oil station pressure is automatically adjusted by the pneumatic diaphragm pressure regulating valve to keep the pressure difference between the pressure in the kettle constant.
[0029] Figure 5 Among them, the nitrogen in the intermediate processing unit is opened and closed by a solenoid valve according to site conditions, and the mechanical seal is purged. The purged nitrogen enters the gas-liquid separation tank for classification and recovery.
[0030] Image 6 In China, each independent outlet of the petrol station adopts double pumps and double motors, one is open and one is ready. After filtering, it is divided into three ways: one is the top mechanical sealing liquid, the other is the bottom mechanical sealing liquid, and the other is to the hydraulic cylinder to provide pressure for glycerin. After returning, it is filtered and cooled back to the fuel tank. The pressure of the sealing liquid is automatically adjusted by the pneumatic film pressure regulating valve of the circuit to keep the pressure difference between the pressure of the sealing liquid and the pressure in the kettle constant.
[0031] In summary, this patent is an integrated oil station control system. A petrol station provides mechanical seal fluid circulation for both pre-polymerization (one device) and polymerization (three devices) while providing pressure for glycerin. A grease pump provides glycerin for the pre-polymerization mechanical seal and the polymerization bottom mechanical seal. , It also has the function of automatic fat supplement. The oil station is divided into four independent outlets according to the equipment, all of which adopt the scheme of double pumps and double motors, one for one opening and one for preparation. Pre-polymerize one equipment with one set of mechanical seals. The outlet of the oil station is divided into two channels, one provides mechanical seal fluid circulation, and the other provides glycerin pressure; polymerization three devices, each with two sets of mechanical seals on the top and bottom, oil The station outlet is divided into three independent outlets, each independent outlet is divided into three channels, two channels provide two sets of mechanical seal liquid circulation at the top and bottom of a device, and one channel provides mechanical seal glycerin pressure at the bottom of the device. The oil route providing glycerin pressure is automatically adjusted by a pneumatic film pressure regulating valve to ensure a constant pressure difference between the glycerin pressure and the pressure in the kettle. When the glycerin reserve is insufficient, the hydraulic cylinder will prompt an alarm, and the grease pump will automatically replenish glycerin; provide sealing fluid circulation The pressure of the oil circuit is automatically adjusted by the pneumatic film pressure regulating valve on the circuit to ensure a constant pressure difference between the pressure of the mechanical seal liquid and the pressure in the kettle. At the same time, in order to ensure the safety of equipment and personnel, we also added an emergency stop reactant branch at the entrance of the glycerin into the mechanical seal, which is controlled by a solenoid valve. When a large amount of leakage occurs, the solenoid valve automatically opens to stop the entry of reactants to prevent accidents. happened. At the same time, nitrogen is introduced between the material seal and the double-end spring mechanical seal to purge the leakage. After purging, it enters the gas-liquid separation tank, and then separates and recovers.
[0032] The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined in this document can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown in this document, but should conform to the widest scope consistent with the principles and novel features disclosed in this document.
