SU366238A1 - DEVICE FOR REGULATING THE TEMPERATURE OF A GAS MIXTURE IN ADAPTED SCRUBBERS WITH HEAT EXCHANGER - Google Patents

Description

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The invention relates to the pulp and paper industry, as well as: to the scrubber control devices used in the workshops for the preparation of turmeric cooking acid of sulphite pulp mills.

When regulating the temperature of the gas mixture in a packed scrubber going to purification of selenium impurities into wet electrostatic precipitators, the cooling water supply to the heat exchanger is controlled by means of a regulator connected to the water temperature sensor at the heat exchanger outlet.

However, such adjustment devices ensure that the temperature of the gas mixture at the outlet of the scrubber is maintained within specified limits under the conditions of disturbances caused by changes in the load of the scrubber in a wide range and the instability of the parameters of the processes along the main control channel.

The purpose of the invention is to improve the quality of controlling the temperature of the gas mixture in packed scrubbers with a heat exchanger and to increase reliability in a wide range of scrubber load variations.

This is achieved by the fact that the device is additionally introduced temperature sensors and flow of the gas mixture at the inlet scrubber.

A cooling water flow sensor in the heat exchanger and a scrubber outlet gas temperature sensor connected to the cooling water supply controller to the heat exchanger.

The introduction of pulses in terms of the temperature and flow rate of the gas mixture at the scrubber inlet, measured by the respective sensors, takes into account and compensates for the disturbances caused by changes in the scrubber load over a wide range. Connecting to the controller the temperature sensors of the gas mixture at the outlet of the scrubber and the flow rate of cooling water in the heat exchanger allows to take into account and

compensate for disturbances caused by instability of process parameters along the main control channel. These sensors must be connected to the controller so that the pulses are

The flow rates of the gas mixture at the outlet of the scrubber and cooling water to the heat exchanger, as well as the pulses for the temperatures of the gas mixture at the inlet of the scrubber and water at the outlet of the heat exchanger, were fed to the regulator with opposite signs.

The use of the device will improve the quality of controlling the temperature of the gas mixture at the scrubber outlet by reducing the duration and maximum dynamic error of transients and

increase the reliability of operation in a wide range of scrubber load.

The drawing shows a schematic diagram of the device for regulating the temneture of the gas mixture in packed scrubbers with a heat exchanger.

It contains a sensor / temperature of the gas mixture at the inlet of the scrubber, made in the form of a thermobar, a sensor 2 for the flow of the gas mixture at the scrubber inlet, a sensor 3 for the temperature of the gas for the outlet for the scrubber, a sensor 4 for the water temperature at the outlet of the heat exchanger, a sensor 5 for the cooling water flow, differential pressure gauges 5 and 7, cold junction box 8 thermocouples of temperature sensors, cooling water supply regulator 9 to the heat exchanger, hand regulator 10, switch keys 11, control keys 12, magnetic starter 13, relative mechanism 14, UK The regulator consists of the scrubber II, the mixer 18 and the heat exchanger 19 of the surface type.

The electrical signals from the tele temperature sensors I, 3, 4, and the flow sensors 2, 5 are fed to the input of the regulator 9 simultaneously with the signal from the hand control setpoint 10.

The signal from the output of the regulator 9 through the keys // p 12 is fed to the magnetic starter: 13, From the output of the magnetic starter, the signal goes to the actuator 14, which controls the movement of the movable rod of the regulator 16. The movement of the movable rod of the regulator 16 is controlled by an indicator 15 position

As the signal increases, the sum of temperatures and flow rates increases as the signal at the output of the regulator 9. As a result, the opening of the regulator 16 increases, which leads to an increase in cooling water flow to the heat exchanger.

The pulses input from the gas mixture temperature sensors at the inlet and outlet of the scrubber and from the gas mixture flow sensors at the scrubber inlet and cooling water into the heat exchanger greatly impede the impulse input from the water temperature sensor at the heat exchanger outlet and carry a great amount of continuous technological information. of the object of regulation at the required rate of change in the temperature of the gas mixture at the output of the scrubber.

As a result, the duration and maximum dynamic accuracy of transients is reduced and the reliability of operation increases over a wide range of scrubber load changes.

Subject invention

A device for controlling the temperature of the gas mixture in packed scrubbers with a heat exchanger, including a water temperature sensor at the heat exchanger outlet connected to a cooling water supply regulator to the heat exchanger, an extra mechanism and a regulating body, in order to improve the quality of regulation and increase reliability in a wide range of changes in the load of the scrubber, temperature sensors and gas mixture flow rate at the scrubber inlet, flow sensor cooling water in the heat exchanger and the gas temperature sensor at the outlet

scrubber connected to the controller of the nodachi of cooling water. In the heat exchanger.

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