Discussion on Blackwater Valve Technology
Thread Content
The black water system is widely used in the coal chemical industry and is one of the important systems in coal gasification units. This system operates for extended periods under severe conditions such as high temperatures, large pressure differences, and liquid-solid erosion. Moreover, the fluid tends to flash during depressurization, posing dual risks of erosion wear and cavitation failure. At present, the black water angle valves used in the gasification and slag treatment units of GE’s coal chemical systems are experiencing severe wear of the valve cores during operation, as well as issues such as erosion and cavitation in the flow channels behind the valve body and seat, valve disc detachment, and valve jamming ； The venturi diffuser at the outlet of the black water ball valve has experienced multiple instances of significant local thinning and perforation leakage, which not only affects the company’s production plans, costs, and profitability but also poses a serious threat to safe operation. It has become a major obstacle to the long-term stable operation of the gasification unit. The black water valves used in our company usually start to develop problems after 4 to 6 months of use. I would like to ask those who are more experienced: which brand of black water valves do you use, and what is their lifespan?
Most of the profits earned by Shanghai Datong and Aerospace 11 come from supporting projects carried out in the early stages; currently, Fisher also offers products of good quality
Current zirconia ceramic ball valves can successfully solve this problem; taking advantage of zirconia’s natural property of a Rockwell hardness of HRC 87, they can operate effectively in black water and ash water for 2–3 years. Currently, they are being used by large coal chemical companies such as Wanhua, Ningmei, and China National Coal Group.
I used François’s before; it broke after about half a year!
The strength is HRC87; its hardness is second only to that of diamond. However, zirconia ceramics must be used – aluminum oxide will not do. How can I get in touch with you to discuss this further?
Use Fisher in the initial stage, and replace it with the one from 11th Institute later on; it’s quite good. It’s sufficient to check it during each major shutdown for maintenance.
Which company manufactures zirconia ceramic ball valves?
How long is the service life of the 11 units available now?
Domestically produced products are fully sufficient for these needs. The lifespan of black, gray, and water valves depends greatly on the skill level of the operators; ceramic ball valves are better in quality, but they are more expensive and are generally used in special chemical applications
At present, imported products still play an important role. In recent years, thanks to improved policies and industrial technologies, the localization of valves for special operating conditions has accelerated. A number of advanced domestic valve manufacturers have made significant progress in producing blackwater/graywater angle valves; these valves can generally be used for more than half a year without any problems. The use of tungsten carbide in whole-sintering and spraying processes further enhances their service life. Learn about the technology of the downward rotating cylindrical angular black water control valve, which addresses the issues in coal chemical industry black water systems in terms of process and materials.
Which organization are you from? ?