SU1594091A1 - Method of controlling the process of filling horizontal cylindrical reservoirs - Google Patents

Abstract

This invention relates to controlling the process of filling horizontal tanks with liquid products. The aim of the invention is to eliminate liquid overflows. The signal for closing the electric valve is given depending on the change in the rate of rise of the liquid level in the tank. 1 il. 1 tab.

Description

The invention relates to controlling the process of filling tanks with liquid products and can advantageously be used to control the filling process of horizontal cylindrical tanks.

The aim of the invention is to eliminate liquid overflows.

At all values of the flow rate of the liquid supplied to the horizontal cylindrical tank, the rate of rise of the liquid level in the tank is not the same. Besides,. ; the rate of lifting of the liquid in the tank depends on the area of the horizontal section of the tank at this level of liquid. At the bottom of a horizontal cylindrical tank, the area of this cross section is minimal, and the speed of lifting of the fluid is maximum, in the middle part of the reservoir the area of this cross section is maximum, and the lifting speed. liquid ma is minimal. In the upper part of the horizontal cylindrical tank, the rate of lifting of the liquid is maximum. If the closing time of the valve is constant, then at high flow rates of the fluid supplied to the reservoir, over- occur. LIVES, therefore, the loss of fluid, and | at low costs - shorting.

The drawing shows a flowchart for controlling the process of filling horizontal cylindrical tanks.

The drawing represents YES: horizontal cylinder i; pipeline 2 supplying fluid to the tank; electric shutter 3; liquid level sensor 4 in the tank; connecting tube 5; camera 6; contact fluid 7; bellows 8: electrical contacts 9 and 10; electric relay I 1; normally open contact 12 of the electrical relay; sensor 13 of housing consumption.

A method for controlling the filling process of horizontal cylindrical tanks is implemented as follows.

In the process of filling the horizontal tank 1, the signal for closing the electric slide valve is carried out depending on the change in the rate of rise of the liquid level in the tank.

Example. .

Pipeline 2 supplies liquid to a horizontal cylindrical tank 1. The rise of the level of the tank in the tank 1 begins, and the given values of it are recorded by the sensor 4 of the liquid level. . : It is an ordinary i. tall glass connected via Tpy6;, j

i

 WITH

ate

CO 4 About CO

/

ky 5 with chamber B. When the level is raised, the liquid closes the bottom of the glass and the glass remains filled with gas. As the level rises further, the hydrostatic forces compress the gases inside the glass, and the level of contact liquid 7 in the left part of chamber 6 lowers and the right side rises, closing contacts 9 and 10. At the same time, the relay AND triggers and closes its normally open contact 12. Electromotor 3 actuates and after time ty, the flow of fluid into the tank is stopped. Such a circuit works well with relatively lower flow rates. At high flow rates during the response time 1h, a relatively large amount of liquid enters the tank. Since the rate of fluid rise reaches 5 cm / min or more (table), the fluid level rises rapidly and. there are overflows. To eliminate overflows, the fluid flow is measured by the sensor 13. A proportional pneumatic signal, depending on the rate of rise of the liquid level, enters the sylph 8. At high flow rates, the sylphs 8 lengthen more, approaching the contact 9 on the insulator with the insulator fluid 7, the signal to close the valve comes earlier, and after a time of 1h the valve closes. With small sizes, the sylphs 8 are shortened, and the beginning of the signal supply time for closing the valve is shifted. Thus, the liquid overflow is completely visible when managing the filling process of horizontal cylindrical tanks.

In the table shows the data, the rate of rise of fluid (V, cm / min) in the mountain zone,

0

cylindrical tanks depending on the level of the liquid (N, cm), in the tank at various flow rates (Q m / min) of the liquid in the tank.

H, cm

V, cm / min, at Q, m / mi

ten

0.8

I

1.2

Claims (1)

Invention Formula A method for controlling the filling process of horizontal cylindrical tanks 30 involving the supply of a signal for closing the electric sludge on the fluid supply line to the tank, characterized in that, in order to eliminate liquid overflows, the signal for closing the electric sludge is performed depending on the speed of raising the level of the liquid in the tank ..  v