With investments in coal chemical industry exceeding 400 billion, how many valves are needed? ? ? ? ?

Apart from some general-purpose valves that can be used in certain coal chemical processing applications, which valves are specifically designed for use in coal chemistry? These include metal hard-sealed wear-resistant ball valves, such as lockhopper valves, slag locking valves, ash locking valves, vent valves, and balance valves. Black water control valve, gray water control valve, high pressure difference control valve. Disk valves, including: lockhopper valves, slag locking valves, ash locking valves, vent valves, and balance valves. Balance valve, slag valve for high temperatures. Coal powder control valve, coal powder three-way directional valve. Pulverized coal switch valve, water-coal slurry cut-off valve, oil-coal slurry cut-off valve, ash-water eccentric valve. Oxygen valve, a ball valve specifically designed for oxygen. Pneumatic hard-sealed ball valve. Orbital ball valve. Sliding valve, pressure relief control valve. Pulse cleaning valve (reverse valve), a cleaning valve specifically designed for ash removal filters. Pneumatic eccentric spherical control valve. Metal hard-sealed wear-resistant ball valves, including: lockhopper valves, slag locking valves, ash locking valves, vent valves, and balance valves. Black water control valve, gray water control valve, high pressure difference control valve. Disk valves, including: lockhopper valves, slag locking valves, ash locking valves, vent valves, and balance valves. Balance valve, slag valve for high temperatures. Coal powder control valve, coal powder three-way directional valve. Pulverized coal switch valve, water-coal slurry cut-off valve, oil-coal slurry cut-off valve, ash-water eccentric valve. Oxygen valve, a ball valve specifically designed for oxygen. Pneumatic hard-sealed ball valve. Orbital ball valve. Sliding valve, pressure relief control valve. Pulse cleaning valve (reverse valve), a cleaning valve specifically designed for ash removal filters. Pneumatic eccentric spherical control valve.

That’s right; projects of this scale are definitely major business opportunities. There are many manufacturers in the pipe and valve sector, so let’s all get together in Yulin

At every coal chemical industry seminar, over 50% of the attendees are sales representatives from manufacturers, with those from valve manufacturers being the most common. During the coffee break, they will hand you a pile of business cards. Whether sales can actually be generated depends more on the quality of the products, after all, the market is small and competition is fierce. Each yard (engineering company)/owner has a Vender list; one must first be added to this long list in order to qualify for inclusion on the project’s short list and thus have the right to submit bids.

It comes down to quality and partnerships, but these cannot be established if one doesn’t go out and seek opportunities

Fully lined hard-sealed ceramic V-ball valves: Industrial structural ceramics possess much higher strength compared to ordinary valves. Their main material is zirconia, which has a hardness of over HRA86 – higher even than that of machined hard-metal valves, whose hardness is around HRA70. Therefore, industrial ceramics exhibit excellent wear resistance. In terms of sealing performance, due to the self-lubricating properties of structural ceramics, the surface finish can reach RA0.1 to RA0.4. The sealing pressure is much lower than that of ordinary metal valves; as a result, there is less resistance when opening and closing the valve, enabling true zero-leakage at VI level. Currently, with the continuous innovation and development of technology, particularly the advancement of new techniques in ceramic processing and molding, ceramic ball valves are widely used in industries such as power plant flue gas desulfurization (FGD) systems, fly ash and slag removal systems, as well as combustion (coal injection) systems. They are also employed in the desulfurization projects for sintering machines in steel plants, in the purification of flue gases from waste incineration, in the chlor-alkali industry, and in the treatment of wastewater and solid waste. The V-type ball valve features a straight-through flow path design, and it possesses the equal percentage flow characteristic of a straight-through globe valve along with a wide range ratio of 1:100. The fully lined, hard-sealed ceramic V-ball valve combines the advantages of structural ceramics with those of V-ball valves, enabling it to meet the requirements of such high-pressure differential relief control valves. A large domestic coal chemical project selected a ceramic-lined hard-sealed V-ball valve as the high-pressure vent valve; the valve body is made of carbon steel with a ceramic lining, while the internal components are made of industrial ceramics.

The high-pressure differential vent valve is necessary to maintain a stable pressure difference (approximately 0.7 MPaG) between the pulverized coal feed tank and the gasifier during normal operation of the pulverized coal gasification unit, so that the coal powder can be evenly supplied to the main burner of the gasifier. This pressure difference is regulated via a high-pressure differential vent valve and another pressure regulation valve, through proportional control based on the pressure difference between the coal powder feed tank and the gasifier. Due to the large pressure difference before and after this vent valve (from 4.8 MPaG to atmospheric pressure), the extremely high flow velocity, and the presence of coal dust particles in the fluid, severe erosion occurs on the valve internals and the pipeline downstream of the valve, posing significant safety hazards. If a straight-through globe valve is chosen for this application, the flow path of the valve has an \"S\" shape, which results in severe erosion. Even if the valve’s flow path and internal components are hardened, the stem and seat still suffer significant wear due to the impact of high-speed coal powder, causing the valve to lose its regulating function and become unable to operate properly.

The slide valve consists of a middle slide plate and clamping plates at both ends; the valve stem drives the slide plate to move in the vertical direction of the fluid, thereby changing the flow area to achieve switching or regulating functions. Due to the straight-through flow channel design of the valve, the erosion of the valve chamber by the fluid is minimized. Moreover, both the clamping plates and sliding plates are made of fully sintered cemented carbide, which possesses high hardness as well as excellent resistance to erosion and corrosion. Based on the use of these valves in various domestic projects over the past few years and subsequent monitoring, it can be seen that in high-pressure differential venting applications in coal powder feeding plants, slide valve systems have a maintenance-free service life of at least 18 months, with an effective service life of nearly 3 years.

High-pressure CO2 and N2 shut-off valves: In coal gasification plants, CO2 and N2 with an operating pressure of around 6 MPa are commonly used as gases for transporting pulverized coal, and their shut-off valves are typically hard-sealed ball valves similar in design to those used for oxygen. Typically, the valve body is made of WCB, while the internal components are made of 316 stainless steel with a Stellite surface treatment.

Oxygen valve: In the pulverized coal gasification process, oxygen is heated and mixed with steam, after which it enters the gasifier under high temperature and pressure. There, it reacts with pulverized coal to produce syngas. Any external or internal leakage of the valves on the oxygen pipeline can lead to serious consequences such as combustion or even explosions, and in more severe cases, it can result in significant losses of life and property. When parking, the safety instrument system automatically shuts off the oxygen cut-off valve and opens the oxygen vent valve to release the oxygen in the pipeline, while using high-pressure nitrogen to purge and protect the oxygen pipeline. To prevent oxygen from entering the high-pressure nitrogen purge line, the isolation valve on this line also needs to be designed in accordance with the standards for oxygen valves. Currently, straight-stroke globe valves are used for the instrumentation in oxygen control valves, with a leakage rating of ANSI CLASS V ； Oxygen cut-off valves and vent valves generally use full-bore two-way metal hard-sealed ball valves, with a leakage rating of ANSI CLASS VI. The oxygen valve should be designed to be fire and static-resistant, and should undergo oil removal, degreasing, and dehydration treatments. The valve body and its components must be smooth without burrs, the flow channels must lack sharp corners, and there must be no environments prone to shocks. The valve stem should be specially designed to ensure that it does not deflect, thereby preventing leakage from the valve. In comparison, the material of the oxygen valve is of paramount importance in ensuring its performance. Currently, the national standard GB does not specify clear requirements regarding the material selection for valves; therefore, design institutes generally use the provisions set out in the latest standard IGC DOC 13/12 of the European Industrial Gases Association (EIGA) as a guide for selecting materials for oxygen valves. For the straight-through Globe valves, due to the tortuous flow paths within these valves, their material should be selected based on requirements for use in impact-prone environments; typically, materials that are exempt from such constraints are chosen. As for cut-off and vent ball valves, although they are not subject to shock conditions during normal operation, the valve internals can cause excessive flow rates and turbulence during emergency shut-off or opening. Generally, the selection of materials should be treated in the same way as for control valves, with exempt materials also being chosen in this case. In a large domestic project, the oxygen operating pressure for the burner in the gasification furnace was 5.2 MPaG, with an operating temperature of 180°C. According to Table 4 in Appendix 4 of IGC DOC 13/12, which provides guidelines regarding allowable pressures and minimum thicknesses, the valve body of the oxygen control valve was made of Inconel 600, while its internal components were made of Inconel 625. The valve bodies and internal components of both the oxygen cut-off valve and the vent valve are made of Inconel 600.