[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. 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.
[0023] See figure 1 , figure 2 , The present invention provides the purpose of the present invention is to provide a DCS redundant control system for a food-grade terpene resin production line, including a central monitoring server 41, a DCS host computer 42, a PLC module 43 connected in sequence, and the PLC module 43 is connected There are a temperature transmitter 44, a double flange differential pressure transmitter 45, an input type liquid level transmitter 46, and a pressure transmitter 47.
[0024] As a specific embodiment of the present invention, the temperature transmitter, the double flange differential pressure transmitter, the input type liquid level transmitter and the pressure transmitter are all made of Hardy alloy; the DCS upper industrial computer The CPU is INTEL2.9G/4GB DDRIII, the liquid crystal display is AOC24-inch LCD, the hard disk is 512G-SATA/DVD burning optical drive, and the network card is 1024M Gigabit network card. The temperature transmitter, double-flange differential pressure transmitter, input type liquid level transmitter and pressure transmitter all adopt radar or ultrasonic methods to detect equipment.
[0025] The production method of terpene resin: The production process is to first polymerize turpentine, toluene, and aluminum trichloride catalyst in a reactor. After the reaction is completed, hot water is injected into the mixed product of the polymerization reaction for hydrolysis and water washing. After the catalyst is decomposed and discharged with water, the water-washed polymerization reaction mixed product is distilled after being qualified, and toluene is recovered through the distillation process, and the base polymer and monomer are extracted during the distillation process, and the obtained terpene resin is obtained. The production method uses a glass-lined reactor body and a built-in coil type cooling device, which is composed of stainless steel coils placed in the kettle. The temperature of the reactant is controlled by the refrigeration system control and the automatic control process, the temperature fluctuation range is small, the equipment runs smoothly, the product color is lightened, and the yield can be increased by 20%.
[0026] The method of the present invention for temperature detection in the equipment is: short-distance lead holes are made at the bottom of the enamel tank at an oblique angle, DN50 flanges can be installed, explosion-proof Exd IICT4 grade, L*l=300*150, 316L sheath, integrated The temperature transmitter detects the temperature of the materials in the reactor. The transmitter has an LCD panel to display on-site temperature. At the same time, it sends a 4-20ma signal to the DCS host computer through the PLC module to achieve real-time temperature monitoring of the reactor by the host computer.
[0027] The liquid level detection method in the equipment of the present invention is: short-distance pipe holes are made at the bottom and top of the enamel tank, DN50 flange can be installed, explosion-proof ExdII CT4 grade, double flange differential pressure transmitter, according to high and low pressure The conversion of the difference and the specific gravity of the material realizes the detection of the liquid level of the reactor material. The transmitter has a liquid crystal meter to realize the on-site liquid level display, and at the same time transmits a 4-20ma signal to the DCS upper industrial computer through the PLC module to realize the upper computer to the reactor Real-time level monitoring.
[0028] In addition, the hot water boiler is equipped with a secondary circulation pipeline, and the residual steam temperature is used to heat the cold water to about 60 ℃, and it is stored in the secondary circulation hot water boiler. The hot water pump in the circulating hot water boiler is heated to 95℃-98℃ for use in the primary water boiler to reduce energy consumption; temperature transmitters are installed in the outlet pipes of the primary and secondary water boilers to detect the temperature and temperature of the hot water. The pressure transmitter is installed on the pot body to detect the liquid level of the hot water pot, and the hot water pump is controlled by the linear temperature of the hot water outlet (frequency converter speed adjustment), and the hot water pump is interlocked with the start and stop methods of the hot water pot liquid level. Boiler hot water automatic circulation, quantitative supply and automatic constant temperature control.
[0029] The following is a detailed description of the instruments involved in the equipment of the present invention:
[0030] A temperature transmitter is installed in the heat conduction reheating steam tank, and the temperature range of its measurable thermal resistance is -200℃~600℃, which is to reheat the steam from the steam generator. The material in the waste recovery tank is toluene, which is highly corrosive. A temperature transmitter is installed in the waste recovery tank. The temperature is controlled at 70-80℃. The liquid level is measured by a double flange differential pressure transmitter. The height requirement for inspection is 1.5 meters. The material in the cotton filter is toluene, which is highly corrosive. There is a temperature transmitter inside. The temperature is controlled at 70-80℃. The liquid level is measured by a double flange differential pressure transmitter. The height of the liquid inspection is required. It is 1.5 meters, and the temperature range of its measurable thermal resistance is -200℃~600℃. The material in the salt filter is toluene, which is highly corrosive. There is a temperature transmitter inside, whose temperature is controlled at 70-80℃. The liquid level is measured by a double flange differential pressure transmitter, and the height of the liquid inspection is required. It is 1.5 meters, and the temperature range of its measurable thermal resistance is -200℃~600℃. An input liquid level transmitter is installed in the vacuum pump pool, and its liquid level detection height is 1.5 meters. The material in the toluene caustic washing pot is toluene, which is highly corrosive. The liquid level detected by the double flange differential pressure transmitter is 1.2 meters. A double-flange differential pressure transmitter is installed in the steam generator to detect a liquid level height of 1.5 meters, and a temperature transmitter is used to detect the temperature range: thermal resistance -200°C to 600°C. The materials in the first material washing pot, the second material washing pot, and the third material washing pot are all toluene, and their temperature is controlled at 70-80℃. They are all equipped with an input liquid level transmitter. The height of the position detection is 2.5 meters, and the temperature range of the thermal resistance in the second material washing pot and the third material washing pot is -200℃~600℃. The product distillation pot is equipped with a temperature transmitter, which controls the temperature at 240-250℃, and its graded vacuum pumping. When the temperature reaches 240℃ or higher, the valve is closed and the first cold oil system, the second cold oil system, and the third The cold oil system allows the temperature to reach 220°C, then adds nitrogen to the positive pressure and then presses it back to the product high tank. The liquid level detection height in the product distillation pot is 1.8 meters. It uses an input type liquid level transmitter and a temperature of the thermal resistance. The range is: -200℃~600℃. The high position tank of the product adopts a double-flange differential pressure transmitter. The height of the liquid level detection is 1.5 meters. The liquid level control automatically pumps the discharge valve in the constant temperature heat transfer oil system to the granulator. The temperature in the product distillation pot is controlled to be pumped into the first recovery tank at 221-240°C, and the temperature is controlled to be pumped into the second recovery tank at 200-220°C.
[0031] The control liquid level in the turpentine distillation tower does not exceed DG321, vacuum operation (-0.1Mpa-0), automatic dripping, automatic reflux, automatic discharging, temperature transmitter to control the working temperature at 80-135℃, liquid level detection The height adopts a double-flange differential pressure transmitter, the height of the detection liquid level is 1.5 meters, and the temperature of the thermal resistance is: -200℃~600℃. The turpentine oil preheating tank has a constant temperature at 70-80°C and returns to the turpentine oil distillation tower for dripping.
[0032] Super acid corrosion in toluene distillation tower, 100℃ acidic gas-liquid exchange toluene, control liquid level without exposure coil, vacuum operation (-0.1Mpa-0, control vacuum degree), automatic dripping, automatic reflux, automatic discharge, work The temperature is 80-135℃, the liquid level detection height adopts double flange differential pressure transmitter, and the liquid level detection height is 1.5 meters. The input type liquid level transmitter is used in the toluene receiving tank, and the liquid level in it is controlled at 1.0 meters; the liquid level in the toluene dripping tank is constant, and the feed volume of the toluene storage tank to be vaporized after alkaline washing is controlled. Liquid level transmitter, liquid level detection height is 1.5 meters. The vacuum degree in the turpentine reboiler is constant, and the temperature converter controls the amount of heat transfer oil in and out. The toluene storage tank uses a double flange differential pressure transmitter to control the start and stop of the liquid level control pump, and the liquid level detection height is 5.0 meters. The turpentine oil storage tank uses a double flange differential pressure transmitter to control the start and stop of the liquid level control pump, and the liquid level detection height is 5.0 meters. After alkaline washing, a double-flange differential pressure transmitter is used in the toluene storage tank to be vaporized to start and stop the liquid level control pump, and the liquid level detection height is 1.2 meters. After the product is distilled, the toluene recovery tank uses a double flange differential pressure transmitter, and the liquid level detection height is 1.0 meters. The temperature controlled heat transfer oil in and out of the hot water boiler, the liquid level controls the hot water in and out, the associated flue heating water inlet, using a double flange differential pressure transmitter, the liquid level detection height is 1.5 meters. The temperature in the first polymerization reactor and the second polymerization reactor is controlled by the dripping amount of turpentine. Stop the dripping above 10°C, cool it to -10°C, and repeat the dripping (automatically heating up the chemical reaction) mixing reaction, and flocculent semi-finished products precipitate, A double-flange differential pressure transmitter is installed inside, and the liquid level detection height is 1.5 meters. The first toluene metering tank and the second toluene metering tank use input-type liquid level transmitters with a liquid level detection height of 1.2 meters. The first turpentine oil metering tank and the second turpentine oil metering tank adopt the input type liquid level transmitter, and the liquid level detection height is 1.2 meters. The cold water tower adopts frequency converter to control the fan frequency.
[0033] The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the present invention. Within the scope of protection.
