SU958842A1 - Evaporator operation mode control method - Google Patents

Description

(54) METHOD OF REGULATING THE OPERATION MODE

one

The invention relates to a power system and can be used to automate the operation of evaporators, for example, to produce steam from water of significant salinity in thermal power plants.

Closest to the present invention is a method of controlling the operating mode of the evaporator by measuring the vapor pressure in the evaporator housing and acting on the regulator in the secondary vapor line of the evaporator by a signal proportional to the measured pressure 1.

The disadvantage of this method is somewhat reduced ACCURACY: regulation.

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

This goal is achieved by measuring the level of evaporated water in the evaporator housing and additionally affecting the regulator by a signal proportional to the measured level.

Studies of the operation of the meter at elevated vapor pressures in the heating section and housing show that measuring the flow rate of the secondary steam is an EQUALIFIER

impact on the level of evaporated water. Due to this, the regulator acting on the regulator in the secondary steam line and thereby measuring the secondary steam consumption, receiving a signal based on the level of evaporated water, improves the quality of the level control. When the level rises, the regulator moves the organ, increasing the consumption of secondary steam and lowering the level. When the Q is lowered, the opposite occurs. To increase the speed of the regulator, to reduce the movement of the regulator, and hence changes in steam consumption when adjusting the level, a previously differentiated signal with respect to the level of evaporated water can be sent to the regulator. If it becomes necessary to eliminate the static adjustment error that occurs when a signal is applied to the controller that is proportional to the level, then only a differentiated signal by level can be fed to the controller.

The drawing shows a diagram of the implementation of the method. Regulator 1, receiving signals from Sensor 2 on the pressure of secondary steam in the evaporator housing 3 and from sensor 4 on the level of evaporated water in the evaporator, moves actuator 5 through the actuator 5 in the secondary line. steam and thereby changes steam consumption from the evaporator. For example, when the level rises, the regulator triggers to an increase in steam consumption, which without a noticeable delay leads to a decrease in the level of evaporated water. Similarly, the process occurs at a lower level. Thus, in the proposed method of controlling the evaporator, a change in the flow rate of the secondary steam leads to the measurement of the level of evaporated water without significant delay and with a significant gain factor, which improves the quality of maintaining the water level. This, in turn, improves efficiency and reliable steam.

To secondary gas collector

Evapora

Claims (1)

the water capacity of the evaporator reduces the cost of servicing it. Claims The method of controlling the operating mode of the evaporator by measuring the vapor pressure in the evaporator housing and acting on the regulator in the evaporator secondary steam line by a signal proportional to the measured pressure, characterized in that, in order to improve the control accuracy, the level of evaporated water in the housing is measured the evaporator and additionally act on the regulator on a signal that is proportional to the measured level. Sources of information taken into account in the examination 1. USSR Author's Certificate No. 500427, cl. F 22 D 1/32, 1973.