Source：Aogong Valve Co. LTDRelease time：2022.09.24Page views：118
Due to the particularity of coal chemical process, the smooth and safe operation of production is very important, among which the control valve is an important link.
As a core application component in coal chemical industry, the control valve is used in a very strict environment. The multi-phase flow composed of gas, liquid and solid is usually circulated in the control valve, and it works in a high temperature, high pressure and high corrosion environment.
The following is to introduce the specific situation and application status analysis of various types of critical control valves in each plant area of coal chemical industry.
First of all, we first understand the application status of control valves in coal chemical industry.
Special valve applications for coal chemical industry include the following categories：
Coal slurry (powder) transportation, including coal water slurry (indirect liquefaction), oil coal slurry (direct liquefaction), etc.; Soot blowing system; Wastewater treatment system; Slag removal system.
Coal chemical industry valve control medium characteristics have the following points：
1.Medium temperature is high, conveying temperature up to 350℃;
2. Gas-liquid-solid three-phase fluid conditions are complex;
3. High working pressure, pressure difference can reach more than 10MPa, resulting in high medium flow rate;
4. The medium contains chloride ion, ammonia, potassium salt, hydrogen sulfide or phosphoric acid and other strong corrosive media.
The status quo of valves used in coal chemical industry has the following two situations：
1.The key valves of coal chemical equipment basically rely on imports, due to the high price of imported valves, short service life, resulting in frequent parking, coupled with the factory away from China, after-sales service is not timely, become the normal operation of coal chemical equipment "bottleneck";
2. Take the present coal chemical plant for example, every 3 ~ 6 months, it needs to stop for maintenance. The critical control valve is seriously scour and corroded, and cannot run stably for a long period. It is the bottleneck equipment that restricts the normal operation of the device.