SU1060216A1 - Method of controlling the temperature conditions of chemical reactor - Google Patents

Abstract

A METHOD FOR CONTROLLING THE TEMPERATURE MODE OF A CHEMICAL REACTOR by controlling the temperature in the lower part of the reactor by varying the temperature of the initial reagents and the temperature in the upper part of the reactor by varying the pressure of water vapor in the reactor heat sink system, characterized in that, in order to reduce the cost of raw materials and increase the process selectivity, the temperature in the lower and upper parts of the reactor, the temperature is adjusted with a correction in the middle part of the reactor.

Description

The invention relates to the automation of technological processes and can be used in the chemical industry in the automation of reactor operation, in which it is required to maintain a predetermined temperature distribution over the height of the reactor.

There is a known method of controlling the temperature regime of a chemical reactor by adjusting the temperature at the bottom of the reactor by varying the temperature of the initial reactants QL.

There is also known a method for controlling the temperature regime of a chemical reactor by adjusting the temperature in the upper part of the reactor by varying the pressure of water vapor in the heat sink system of the reactor 2.

However, the known methods do not allow to realize the optimum temperature profile in the reactor, which leads to an increase in raw material costs and a decrease in the selectivity of the process.

The purpose of the invention is to reduce the cost of raw materials and increase the selectivity of the process.

This goal is achieved in that according to the method of controlling the temperature regime of a chemical reactor by controlling the temperature in the lower part of the reactor by varying the temperature of the initial reagents and the temperature in the upper part of the reactor by varying the pressure of water vapor in the reactor heat sink system, the temperature in the lower and upper parts of the reactor is It is corrected by temperature in the middle part of the reactor.

The drawing shows an example implementation of the method.

The flow rate of the initial reagents supplied to the reactor 1 is stabilized with the help of the controller 2, and the level in the system of the reactor heat sink - with the help of the controller 3.

The temperature in the upper part of the reactor is controlled by the regulator 4 by acting on the regulator 5 of the water vapor pressure E: the reactor heatsink system.

The temperature in the lower part of the reactor is controlled by regulator b by acting on the valves 7 and 8 of the cold and hot streams of the initial reactants, respectively. Temperature correction in the middle part of the reactor is carried out using differentiation unit 9 and regulator 10 The temperature of the hot flow is stabilized by regulator 11 by changing the steam supply to the heater 1

The method is carried out as follows.

The flow of the initial reactants before the reactor is divided into two parts:

one part passes through the preheater 12, the second passes it, mixing with the preheated stream before the reactor. Valves are installed on hot and cold lines

0 7 and 8 different execution. On the line of a hot flow, for example, Air closes, on the line of cold air. current air opens. These valves are connected to a temperature controller b.

5 at the bottom of the reactor. When, for example, the temperature in the lower part of the reactor rises, the output signal of the controller b increases, which causes the valve 8 to close on the hot line.

„Flow and opening of valve 7 on the cold flow line. In this case, the total flow rate does not change, and the temperature of the inlet stream drops, as a result of which the temperature at the bottom of the reactor comes to a predetermined value.

The temperature in the upper part of the reactor is maintained at a predetermined level by means of a temperature regulator 4 acting on the pressure regulator 5.

The greatest parametric sensitivity to the action of non-controversial. perturbations (changes in the hydrodynamic situation in the reactor, changes in catalyst activity, etc.) have a temperature in the middle of the reactor, because the reaction rate is maximum here, so this temperature is used to enter corrective actions both in the bottom temperature controller and in temperature controller of the upper part of the reactor. When increasing, for example, the temperature

5 in the middle of the regulator 10 through the regulator 6 of the temperature of the lower part of the reactor reduces the inlet temperature of the initial reagent stream. At the same time, through the differential unit 9, circulating, temperature controller of the upper part of the reactor and the vapor pressure regulator, a vanishing signal is given to decrease the temperature of the refrigerant in the reactor heatsink system, which leads to recovery of the temperature in the middle part of the reactor.

Thus maintaining the temperature at three different points

The height of the reactor at given levels is 60, it is possible to approach the optimum temperature regime and thereby achieve improved technical and economic performance of the reactor.

The use of the proposed reactor co-output ethylene oxide with a combined control allows to increase 1.8 and 2.5% while simultaneously increasing the concentration of the target product on the process selectivity from 70 to 75

1060216

  (

Claims (1)

METHOD FOR MANAGING THE TEMPERATURE MODE OF A CHEMICAL REACTOR by controlling the temperature in the lower part of the reactor by changing the temperature of the starting reagents and the temperature in the upper part of the reactor by changing the pressure of water vapor in the reactor heat sink system, characterized in that, in order to reduce the cost of raw materials and increase the selectivity of the process, the temperature in the lower and upper parts of the reactor are adjusted with temperature correction in the middle part of the reactor.