SU1204861A1 - Method of protecting steam line against ingress of fuel oil - Google Patents

Description

The invention relates to a power system and can be used to protect steam and oil lines of boilers of various capacities.

The purpose of the invention is to reliably protect the power and steam power plants.

The drawing shows a diagram of the device for implementing the method.

The device contains pressure sensors 1 and 2 in the steam line 3, connected to comparison unit 4, sensors 5 and 6 are connected to other inputs, the output of comparison unit 4 is connected to the input of control device 7, outputs of which are connected through time delay 8 control valves 9 and Yu in the steam line 3 and the fuel oil line 11 and a signaling device 12.

The method is carried out in the following manner.

Pressure sensors 1 and 2 are installed as far as possible on either side of the gate valve 9 on the steam line 3. When the pressure P of the heating steam reaches the stop valve over the pressure P of the steam after the gate valve, I heat the Editor M. Bandura

Compiled by A, Zosimov

Tehred A. Boyko Proofreader L. Pilipenko

Order 8512/37 Circulation 399Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35 "Raushsk nab. 4/5

Branch PPP Patent, Uzhgo1 od, st. Project, 4

04861

Steam is fed to the fuel oil line.

When the pressure of the heating steam after the shut-off valve is exceeded

5 by steam pressure up to the shut-off valve, the fuel oil can be returned through the shut-off valves 9 and 10 into the steam line 3.

With P – P d, the differential pressure signal is used for signaling, and with P – P P Lg. - as a command signal to close the shut-off valves on the steam line and the fuel oil line, where h is the set value 15, generated by the setting device 5, y. is the setting value of the setting device 6.

When the pressure difference from sensors 1 and 2 decreases to the first value of the setpoint (AL), the signal from block 4 through 20 the control device 7 is fed to the signaling unit 12. When the pressure difference from sensors 1 and 2 drops to the second setpoint (L 2), the signal from block 4 through control device 7 and block 8 of the time delay filtering spurious signals affects the closure of valve 9 on the steam line 3 and valve 10 fuel oil line 11, which prevents

jg fuel oil entering steam line 3,

Claims (1)

METHOD FOR PROTECTING A STEAM PIPE FROM HAZARD OF OIL WITH OIL BY CLOSING ON THE COMMAND SIGNAL OF THE LATCH GATE INSTALLED AT THE STEAM PIPELINE AND THE OIL FUEL CHARGE, CHARACTERIZED IN THAT, IN ORDER TO INCREASE THE PROTECTION OF VAPOR, THE DIFFERENCE OF VAPOR PRESSURES IN THE PIPELINE BEFORE AND AFTER THE GATE differences from the setpoint are used as a command signal.