Selection of ball valve structure in coal chemical fly ash systems

I’m not very familiar with the coal powder process, so I’d like to ask gently: for solid media, is the sealing performance of ball valves important? Why not use a plug valve?

In fly ash systems, ball valves are subject to severe erosion by the medium flowing through them. Once a leak occurs inside such valves after they are closed, it can lead to blockage of the valve in a short time. In cases of severe internal leakage, it can also cause erosion and wear of both the valve ball and the valve seat. Therefore, a blocked valve is definitely caused by internal leakage. Metal hard-sealed ball valves rely on a metal-to-metal seal, which makes it difficult to ensure low leakage levels. Leakage can only be controlled through design aspects such as the use of valve seats with sealing compensation, or by increasing the hardness of the internal components (through hardening treatments to create a difference in hardness between the ball and the seat). As friction occurs and the elastic compensation mechanism fails, leakage is inevitable sooner or later; the difference lies merely in how long domestic or imported valves can resist this issue.

A disc valve can be considered as a replacement. Long service life

A slag guiding structure (slag guiding groove) is fabricated in the valve body structure behind the valve seat; a large pressure difference is generated at the moment the valve is opened or closed, which helps to remove any accumulated ash. Additionally, purging is employed (commonly used in the petrochemical industry).

Expanding butterfly valves could also be considered: they provide excellent sealing for both ash and solid particles, and have a long service life； Globe valves (knife valves) could also be considered

However, it seems that dome valves currently have a relatively high share in fly ash systems

A biased bell valve can be used; it features self-locking capability and a soft seal, with no friction when the sealing surfaces open or close. It is generally employed in the dust removal systems of iron smelting plants, and its service life can reach two years

Our company carried out a comprehensive renovation of the ARGUS ball valves in Shenhua Ordos coal-to-oil fly ash system; these valves have been in use for over 10 months on average, with some reaching up to 13 months. Last year, our company carried out major repairs on 92 metal hard-sealed ball valves for the Shenhua Ordos coal-to-oil and gas conversion units, ensuring they met all operational requirements. If you are interested, feel free to call for further discussion. This is not an advertisement; it is 100% genuine and reliable. The phone numbers of the chief engineer and chief technical officer in charge of coal-to-oil projects at Shenhua Ordos can be provided for verification. Our company name is Chongqing Chuanyi Special Valve Repair and Manufacturing Co., Ltd.; the contact person is Mr. Zhu, and the phone number is 13500305728

Try ceramic ball valves, they resist wear and scouring