SU1118646A1 - Method of automatic control of rubber aqueous degassing process - Google Patents

Abstract

AUTOMATIC CONTROL METHOD FOR THE PROCESS OF AQUEOUS DIAGASATION OF A KAUCH in a continuous degasator by determining the consumption of solvent entering the degasser with polymerizate and changing the consumption of steam in the degasser-, in order to reduce the cost of the final product, you will not have to use the unit to remove the cost of the final product, in order to reduce the cost of the final product, to remove the steam in the degasser-, in order to reduce the cost of the final product, you will not have to use the unit to remove the cost of the final product, in order to reduce the cost of the final product, to remove the steam in the degasser-, in order to reduce the cost of the final product, you will not need to get the cost of the final product, in order to reduce the cost of the final product, to remove the steam in the degasser - in order to reduce the cost of the final product; measure the temperature of the vapor of the distillate and the temperature of the refrigerant at the inlets and outlets of the heat exchanger, as well as the concentration of the solvent in the vapor of the distillate, measure and stabilize refrigerant flow to the heat exchanger, determine the flow rate of the distillate vapors depending on the flow rate of the refrigerant and changes in the measured temperatures of the distillate vapors and the refrigerant, determine the flow rate of the solvent removed from the degassing unit with the distillation vapors, and the concentration of the solvent in them and change consumption of steam vapor in the degasser depending on the 5g of the difference between the costs of dissolving (Ll, flow and output from the degasser.

Description

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The invention relates to the field of automating the production of synthetic rubber and can be used in the production of SKI rubbers, sneakers, etc. In the chemical and petrochemical industry.

There is a known method of automatically controlling the rubber degassing process in a continuous operation apparatus by varying the steam consumption depending on the residual hydrocarbon content in the degassed rubber crumb, and when the residual hydrocarbon content deviates from the nominal increase from the nominal, the particle size of the deg- decreases. of the substance to be removed with a subsequent increase in steam consumption, and when deviating in the direction of decreasing, the degassing temperature decreases by affecting the steam consumption in the direction of decreasing flj.

However, this method is characterized by an insufficiently high quality of rubber degassing, since the method does not take into account the consumption of polymerization | Ta and the concentration of polymer in it, and also because of the long duration of the analysis of the residual hydrocarbon content (solvent) in the crumb, resulting in an effect. the steam consumption of the residual hydrocarbon content in the chips is accomplished with a large delay.

The closest technical essence to the present invention is a method for automatically controlling the process of native rubber degassing in continuous degasing devices by determining the solvent consumption entering the degasser with polymerizate and changing the steam consumption to the degasser 2.

The disadvantage of this method is the high cost of the final product, since the method does not take into account the amount of solvent distilled off from the crumb of rubber.

The purpose of the invention is to reduce the cost of the final product.

The goal is achieved by the fact that according to the method of automatic control of the process of water degassing of rubber in a continuous degasser by determining the flow rate of the solvent entering the degasser with the polymerizate and changing the flow rate of the vaporizer to the vaporizer, the distillation vapors after the degasser pass through the heat exchanger, measure the vapor temperature o The throttle and refrigerant at the inlets and outlets of the heat exchanger, as well as the concentration of solvent in the distillate vapors, are measured and stabilized by the flow rate of the refrigerant into the heat exchanger, Interior dissolved consumption stripping vapor depending on the refrigerant flow and the measured differences

distillation vapor and refrigerant vapor, determine the flow rate of the solvent removed from the degasser with the distillate vapors, depending on the flow rate of the distillate and the concentration of solvent in them and change the steam flow to the degasser depending on the difference between the solvent flow, and output from the degasser .

The drawing shows a block diagram of a system implementing the proposed control method.

The system contains a degasser 1, a heat exchanger 2 with a jacket to which refrigerant is supplied, a sensor 3 for dolimerizate, a sensor 4 for polymer concentration in the polymer, a control circuit for steam consumption consisting of sensor 5, controller 6, valve 7, sensors 8 and 9 the temperature of the distillate at the inlet and outlet of the heat exchanger 2, the sensors 1Q and. 11 of the refrigerant temperature at the inlet and outlet of the heat exchanger jacket 2, the coolant flow control loop; consisting of a sensor 12, a regulator 13, a valve 14, a sensor 15 of the concentration of solvent in the distillate, and a control computer (UVM) 16.

In the degasser 1 serves the water flows of the solvent, which enters the degasator along with the polymer, and steam. In the degasser, under the action of the vapor, the polymer is broken up into particles, from which the hydrocarbons are distilled off (solvent,). Hydrocarbons, together with water vapor, are discharged through the top of the degasser to heat exchanger 2 and further to condensation. From the cube of the degasser 1, the rubber pulp is withdrawn to the next degassing stage or to the rubber release aggregates. The rubber pulp is a suspension of rubber crumbs in water.

The control of the process of water degassing of rubber according to the proposed method is carried out as follows.

Information from sensors 3-5, 8-12, 15 is entered into the PSU.

According to information from sensors 3 and 4 of the flow rate п pt of the polymerizate and the concentration of polymer in it, the flow rate 5p of the solvent entering the degasser 1 together with the polymerizate is determined according to the formula C1p „(gc).

Stabilize the flow rate of the refrigerant, e.g., the purified water, to the heat exchanger 2 by means of a control loop consisting of a sensor 12, a regulator 13 and a valve 14.

According to information from sensors 8 and 9 of temperatures Ted /, y of the distillation vapors at the inlet and outlet of heat exchanger 2, sensors 10 and 11 temperatures, Txd, 4Accumulator at the inlet and outlet of heat exchanger 2, flow sensor 12 & A, and refrigerant determine the flow rate Gp vapors of the distillate CHL 8OX HL of their go (x-Tw, x) where VxAf is the heat capacity of the refrigerant and distillate. According to information from sensor 15, concentration of solvent reflux in the otgoy, the flow rate Q p „of the solvent with the distillate otg otg is determined. The difference in the flow rates ЕЕ between the consumption of the solvent supplied to the degasser together with the polymerizate is determined, and in the vapors of the distillate aG Gp-Gpn the knockout effect of Gp on steam consumption in a degasser is according to the formula “al K, Gp +, where Km is the specified cost-to-solvent ratio; Kj is the adjustment of the regulator, a constant. Thus, regulation is carried out not only on perturbation by changing the flow rate of the solvent in the degasser together with the polymerization agent, but also on the deviation (the deviation from the quantity of the difference between the flow rates of the solvent contained in the polymerizate and in pairs of distillate). As a result, the solvent consumption is reduced, and at the same time, steam consumption for degassing is reduced compared to the base object. Using the proposed method makes it possible to reduce losses. solvent and costs of isoprene and steam, which reduces the cost to 1.7 R. per 1 ton of rubber.

Claims (1)

METHOD FOR AUTOMATIC CONTROL OF THE WATER DEGASATION OF RUBBER PROCESS in a continuous degasser by determining the flow rate of solvent entering the degasser with polymerizate and changing the flow rate of steam into the degasser · heat exchanger, measure the temperature of distillation vapors and the temperature of the refrigerant at the inlets and outlets of the heat exchanger, as well as the concentration of solvent in the distillation vapors, measure and stabilize the flow refrigerant heat exchanger, defined vapor flow distillation depending on the flow of the refrigerant and drops measured temperatures stripping vapors and refrigerant, determine the solvent flow rate output from the degasifier with vapor stripping, depending on the flow rate of distillate vapor and solvent concentration therein and alter rate _β couple in degasser depending on the $ 5 difference between the costs of the solvent entering and leaving the degasser. 1118646.