SU414573A1 - - Google Patents

Description

The invention is a control and regulation technique and can be used in the oil refining and petrochemical industries.

Known regulatory blocks that implement the laws of regulation. They are usually integral components of automatic control systems containing a proportional-integral controller, an adder, and a software setter. The disadvantage of this system is the complexity of the design, the inconvenience of installation and operation, limited functionality, the difficulty of reproducing the line of optimal temperatures.

In order to expand the functional potential of the gay, to simplify the design and increase the control level, the regulator of the proposed unit is equipped with a five-membrane comparison element, a master device and a pneumatic divider, the output of the pedal divider is connected to the first chamber plus a comparison element, the driver output is from the camera "plus the element of comparison, and the output of the latter with the camera" setting the regulating part of the block.

Such an embodiment of the block simplifies the entire automatic control system by replacing the three blocks with one, extends the functionality due to continuous correction to the quality of the raw material, and improves the control accuracy due to a more accurate recovery of the optimum temperatures.

In the drawing is a diagram of the control unit.

The control unit contains an integral-integral regulator 1, a five-membrane element compared to 2, a driver 3 and a pneumatic divider 4.

The control unit operates as follows.

The pneumatic signal X :, which is the proportional temperature difference between the middle and bottom of the reactor, enters the chamber minus the reference element. A pneumatic signal X2, proportional to raw loading, is supplied to the first chamber plus via a pneumatic divider. The conductivities of the chokes of the pneumatic divider are selected so that its expenditure characteristic replicates the line of on-temp temperatures. The second camera “plus receives a signal corresponding to the average quality of this raw material from the driver, which has a standard output signal in the range of 0.2-1.0 kg / cm. It is possible to include a raw material quality analyzer in the automatic control system.

the output signal of which can be fed to the second camera “plus as an automatic task correction to the quality of the raw material. The output nneumatic signal on the comparison membrane element enters as a signal at the optimum temperature in a proportional-integral regulator, where it is compared with the pneumatic signal Xs, which is normalized to the measured temperature at the top of the reactor. The output signal Y of the control unit is the reference for controlling the temperature of the raw material output from the tank.

subject matter

The catalytic cracking reactor temperature control unit containing a proportional-integral regulator, an adder and a setting device, characterized in that, in order to expand the functionality, simplify the design and improve the control accuracy, the regulator is equipped with a five-membrane comparison element, a master device and a pneumatic regulator , with the output of the nevmatic divider connected to the first chamber "plus the reference element, the output of the driver - to the second camera" plus the element cf Avneni, and the output of the latter - with the camera "setting the regulatory part of the unit.

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