SU836626A1 - Method of control of regenerator operating mode - Google Patents

Description

(54) METHOD OF CONTROLLING THE MODE OF THE REGENERATORS

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The invention relates to the field of automatic control of technological objects of the chemical, metallurgical industry and can be applied, for example, in air separation plants.

A known method of automatically stabilizing the thermal regime of several groups of reversible heat exchangers by switching the heat exchangers according to the temperature at the cold end 1.

Of the known methods of automatic control of the operating mode of generators, the closest in technical essence to the invention is the method of automatic control of the temperature regime of the group of regenerators 2.

This method consists in the fact that the temperature is stabilized by applying direct and loop flows. ,

The disadvantages of the known control methods are that for all modes of operation of the plant in a controlled cross section, a predetermined temperature value that corresponds to the nominal thermal load of the regenerator is maintained.

For boom modes other than nominal, the operating efficiency is reduced, since each mode corresponds to a certain temperature difference at the cold end of the regenerator, ensuring the most efficient operation of the regenerator.

These shortcomings either lead to an increase in energy consumption for

0 separation products of air, or to an increase in the number of explosive impurities entering the installation.

The aim of the invention is to reduce energy consumption.

The unassigned goal is achieved by determining the flow rate and temperature of the direct flow, determining the heat load of the regenerators, and correcting the backward value of the temperature at the cold ends of the regenerators depending on the magnitude of the deviation of the current value of the thermal load from the nominal one.

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The drawing is a diagram of the device that implements the method.

Claims (2)

The device contains regenerators .1 ,. flow sensors 2 and temperatures 3, installed on the forward flow 4, computing units 5 and 6, comparison unit 7, temperature sensors 8.9 and 10. on. the cold ends of the regenerators, the control unit 11 associated with the actuators 12, the control of the regenerators of the proposed method is as follows. When changing, the mode of operation of regenerators .1 current information from Y. Chikov 2.I. 3 is supplied to a computing unit 5, where the current value of the heat load is calculated and in e-h-rtkloneniya. heat value from nominal (Yojg). Information on the value of uQper is given to the input of the computing unit 6 where the value of the task at the cold end of the regenerator (tSf) is determined by the formula, Qp ,, .. where is E0, and are coefficients; corresponding to a specific type of regenerators .. - The setting tf obtained in block b is fed to the input of block 7, where the setpoint is compared with the current temperature value at the cold end of the regenerators, which is supplied from sensors 8.9 and 10. The error signal serves on the input of the control unit 11, which generates the control signals acting respectively on the regulators of the first and second groups of regenerators, as well as on the regulator of the common loop flow. This method of controlling the operating mode of regenerators makes it possible to ensure the efficient operation of regenerators in the whole working range of changing the heat load of the regenerators. Technical and economic calculations show that when applying the proposed method, the power consumption decreases, depending on the operating time of the regenerators, by about 0.1-1.5% compared with the prototype. Claims of the method of controlling the mode of operation of the regenerators, which consists in stabilizing the temperature at the cold ends of the regenerators by changing the flow rates in the forward and loop flows, in which the heat load of the regenerators is measured to reduce the energy consumption by measuring the flow and temperature of the forward flow and adjust the set value of the temperature at the cold ends of the regenerators depending on the deviation of the current temperature 1 |, the heat load from the nominal. Sources of information taken into account during the examination 1. USSR author's certificate No. 261370, cl. G 05 D 23/00, 1972. 2. Authors certificate of the USSR 535445, cl. F 25 J 03/00, 1976 (prototype).