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condition. The principle of the self-operated thermostatic regulating valve is to apply active liquid conditioning with the principle of liquid heat shrinkage and liquid non-shrinkage.
Liquid shrinkage is average, self-regulating temperature control, controlled medium temperature change
At the same time, the volume of temperature-sensitive liquid in the sensor shrinks or shrinks. When the temperature of the controlled medium is higher than the set value, the temperature sensitive liquid shrinks and the controller pushes the valve
The core closes the valve downwards to increase the flow of the heat medium and thus decrease the temperature of the liquid; on the contrary, when the temperature of the controlled medium is lower than the set value, the temperature-sensitive liquid is collected.
Shrinking, the reset spring in the bracket pushes the valve core open, increasing the flow of the heat medium to advance the temperature of the liquid. The valve device is simple and does not require a power source.
Conditioning sets a difficult, balanced spool design.
The pickling process is the critical process for chemically removing the outer scale of iron oxide before the cold rolling of the strip, because the advantages of hydrochloric acid pickling are outstanding.
Most of the former pickling units use hydrochloric acid pickling methods. The pickling consumption line follows the trend of extended pickling time and improved pickling quality.
Deep tank pickling and shallow tank pickling are carried out to the current turbulent pickling process. Acid temperature is a very important issue in the process, it is too high or too low
All of them indirectly affect the indicators of consumer economic skills such as output, quality, and old books.
The following two points are important for the effect of temperature on strip pickling in practice:
(1) pickling speed. In hydrochloric acid pickling, increasing the temperature of the acid can increase the speed of pickling, when the temperature is reduced from 18°C ​​to 60°C, hydrochloric acid
The speed of pickling is improved by 9 to 10 times.
(2) Volatilization of the acid mist. Hydrochloric acid is a volatile acid, and the HCl gas volatilized into it will cause great harm to people, metals and buildings and the environment.
Therefore, under the premise of guaranteeing the yield and quality, the temperature of the acid should be reduced to increase the volatilization of the acid mist.
By manually adjusting the steam valve of the graphite heat exchanger to complete the acid temperature control of the pickling line, there are large uncontrollable factors, and the output, quality, and cost
The impact of consumer economic skills indicators is large. Therefore, it is necessary to actively reform the acid temperature.
It is understood that the domestic comparison of advanced pickling line acid temperature control has been completed in the closed-loop mastery, that is, the corrosion resistance of the thermal resistance device in the acid circulation pipeline
The measured signal reacts to the main PLC and follows the established process. The PLC sends a signal to the steam pipe solenoid valve of the acid circulation heat exchanger through the opening of the valve.
Degrees to improve or decrease acid temperature. The advantage of this method of mastery is that it is accurate and timely to grasp the contrast, and the defect is that the investment is large and the service life is short. It is important that
Steam solenoid valves are more expensive and easily damaged. Therefore, the temperature control method of the rest of the consumer line is used for reference. By adopting the self-operated temperature control valve innovation,
Become an active closed-loop master of acid temperature.
Self-operated temperature control valve does not need external power to adjust the temperature, it is used in steam, hot water, hot oil and other medium heat exchangers.