SU552598A1 - Parametric Regenerator Control Device - Google Patents

Description

one

The invention relates to control devices for heat exchangers, in particular, regenerators of air separation plants.

A device for parametric control of regenerators is known which automatically switches regenerators when a predetermined temperature value is reached at their cold end in a certain time zone outside which switching is impossible.

The closest to the technical essence of this invention is a device for parametric control of regenerators, containing channels for controlling groups of regenerators, each of which contains a block for forming the main value of a parametric Signal, a programming block, a temperature sensor, an And element, and a memory block.

The disadvantage of such a device is the limitation of the switching of regenerators for a given temperature value to a certain time zone. This restriction leads to a temperature mismatch of the norm.

The device does not exclude the possibility of simultaneous switching of two groups of generators.

The purpose of the invention is to improve the accuracy of the device and ensure the simultaneous switching of several groups of regenerators.

This is achieved in that in the proposed

device each of the mentioned channels

equipped with an intermediate value forming unit of a parametric signal, a short front pulse and a decay intermediate value of a parametric signal, an OR element whose output is connected through a memory unit to the input of the programming unit, and its input is connected through an AND element to the inputs of a short front pulse shaper and the fall of the signal and the output of the block forming the intermediate value of the parametric signal, and

Claims (2)

the output of the short decay pulse former is connected to the input of the memory unit, and the short edge pulse former output is connected to the input element And the subsequent control channel of the regenerators, moreover, the And control channel element is connected to the inverse output of the main control parameter formation unit of the subsequent control channel. If the intermediate values of the parameter coincide, the group of regenerators switches in which the intermediate value of the parameter is reached earlier. For this purpose, the output of the intermediate value generating unit of the parametric signal is connected to the And element of its control channel and through the shaper of a short signal front pulse to the And element of the subsequent control channel. The output of the AND element is connected via the OR element and the Memory block to the programming block. Such an advance of switching of one group of regenerators is permissible according to the technological mode, since it does not introduce any disturbances in the technological process. In order to exclude simultaneous switching of groups of regenerators in case of failure of the formation units of the main parameter value, for example, at the same time false generation of the main value of the parametric signal, the direct output of the formation unit is connected to the AND element of its control channel, the output of which through the OR elements and the memory block is connected to programming unit, and the inverse output - with the element And the subsequent control channel. The switching of the regenerator group is considered complete when the parameter returns to normal, therefore the Reset of the memory unit is connected to you: the generator of the short pulse of the signal dropping, the input of which is connected With the block forming the intermediate value of the parametric signal. The drawing shows the proposed device parametric control regenerators. 0 "o consists of control channels of 1, 2 groups of regenerators. Each control channel contains a temperature sensor 3, a block 4 of forming the main value of a parametric signal, a block 5 forming an intermediate value of the parametric signal, a driver 6 for a short pulse of the signal front, a driver 7 for a short pulse for dropping the signal, elements AND 8, 9, element OR 10, a memory block Ti 11, programming unit 12 (T is the direct output of block 4, T is the inverse output of block 4). The device works as follows. The signal from sensor 3 goes to block 4 of forming the main value of the parametric signal and block 5 forming the intermediate value of the parametric signal (these blocks can be used with a standard temperature indicator type CT-020M, which has two signaling channels). When the intermediate value of the parameter is reached, block 5 generates a signal at the input And 9, shapers 6 and 7 5 a short pulse of the signal front and the fall of the signal. The output of the driver of the short pulse of the signal front is connected to one of the inputs of the control element AND channel 2. If the parameter of this control channel also reaches an intermediate value, then a signal appears at the output of the driver of the short pulse of the signal front, therefore, at the input of the element 9. When signals coincide at two inputs of the element AND 9, a signal is outputted at its output, which through the element OR 10, the block of memory 11 enters the programmer 12, the latter switches the regenerators in a known manner. After switching the parameter returns to normal. By the decrease in the signal of the intermediate parameter value, a short pulse of the formers 7 is generated, which is fed to the dump of the memory block 11. In the absence of the intermediate parameter value from the control channel 2, the AND 9 element does not work, then when the main parameter value is reached, the signal "a the output of block 4, which is connected to the element AND 8. If there is a signal "1" at the inverse output of the block 4 of the control channel 2, then the output of the signal AND 8, which through the element OR 10 and the memory block AND enters the program block 12. The proposed device can be implemented on any discrete logic elements. It provides independent temperature switching, eliminating its exit from the norm. Claim 1. A device for parametric control of regenerators, comprising channels for controlling groups of regenerators, each of which Contains a unit for generating a basic quantity of a parametric signal, a memory unit, a programming unit, a temperature sensor, and element, characterized in that Each of these channels is provided with a block for forming an intermediate value of a parametric signal, formers of a short front pulse and a decay of an intermediate value for pairs signal, the OR element, whose output is connected through the memory unit to the input of the programming unit, and its input through the element AND is connected to the inputs of the shapers of the front and low impulse signals and the output of the intermediate value generating unit of the parametric signal, the output of the short impulse shaper is connected with the input of the memory unit, and the output of the imager of the short pulse of the front - with the input of the element And the subsequent control channel of the regenerators. 2. The device according to claim 1, characterized in that, in order to simultaneously switch several groups of regenerators, the element AND of one control channel is connected to the reverse output of the unit for generating the basic value of the parametric signal of the next control channel.