SU958841A1 - Method of controlling operation mode of evaporator - Google Patents

Description

(54) METHOD OF REGULATING THE OPERATION MODE

one

The invention relates to a power system and can be used to control surface-type evaporators, for example, to obtain condensate and steam from water of significant salinity in thermal power plants.

Closest to the present invention is a method of controlling the operation mode of the evaporator by measuring the vapor pressure and the level of evaporated water in the evaporator, acting on the supply controller of heated water by a signal proportional to the measured pressure, and acting on the heating supply controller 1.

The disadvantage of this method is a somewhat lower control accuracy. This is especially true for maintaining the level of heated water.

The purpose of the invention is to improve the accuracy of regulation.

This goal is achieved by the fact that the heating steam supply controller is influenced by a signal proportional to the measured level of evaporated water. EVAPORATOR

The drawing shows a diagram of the implementation of the method.

The heating steam supply regulator 1 receives signals proportional to the level of the evaporated water in the evaporator housing 2 from the level 3 meter and the position of the valve 4 from the position meter 5. The evaporator water supply regulator 6 receives a signal proportional to the vapor pressure at the outlet of the evaporator 2 from the pressure gauge 7, and 10 controls the valve 8. The heating steam condensate is discharged through the valve 9.

When the pressure at the outlet of the evaporator changes, for example, when it is lowered, the regulator 6 opens the valve, increases the water flow. The increase in level caused by this entails the activation of regulator 1, which moves valve 4, increasing the flow of heating steam to the evaporator, which leads to an increase in the flow of secondary steam and an increase in its pressure. 20 The process continues until the pressure at the outlet of the evaporator is restored to the original.

Similarly, the circuit operates at an outlet pressure increase.

Claims (1)

Claim A method for controlling the operating mode of the evaporator by measuring the pressure pa pa and levels of water evaporated in the evaporator effects on regulator supplying heated water from a signal proportional to the measured pressure and impact on the regulator supplying heating steam distinguishing ⁵ by the fact that, in order to improve control accuracy , the heating steam supply regulator is affected by a signal proportional to the measured level of evaporated water. _{) 0} Sources of information taken into account during the examination 1. USSR copyright certificate No. 200758, cl. 22 D 5/30, 1966.