China is a country with an energy structure primarily based on coal. Its air pollution is characterized by soot, dust, sulfur dioxide (SO2), and nitrogen oxides (NOX), which are the main atmospheric pollutants in the country. In sectors such as power generation, metal smelting, glass production, fiberglass manufacturing, and the chemical industry, coal and high-sulfur heavy oil, along with raw materials containing sulfur and calcium fluoride, lead to flue gas emissions rich in SO2 and hydrogen fluoride (HF). These harmful gases contribute significantly to atmospheric pollution and are major causes of acid rain. Acid rain and SO2 pollution have resulted in substantial economic losses, affecting crops, forests, and human health, becoming a critical factor that hinders China's economic and social development.
To address this issue, the State Council approved the "Plan for Controlling Acid Rain Control Areas and Sulfur Dioxide Pollution Control Zones" on January 21, 1998, under the letter No. [1998]. For example, newly built or renovated power plants using coal with sulfur content exceeding 1% must install desulfurization facilities. Flue gas desulfurization (FGD) is the primary method for controlling SO2 emissions from coal-fired power plants. Globally, several mainstream desulfurization technologies exist, including wet, dry, semi-dry, and ammonia processes. Among them, the limestone-gypsum wet desulfurization process stands out due to its high desulfurization efficiency, large-scale flue gas treatment capacity, mature technology, long stable operation, minimal impact from load fluctuations, and low-cost absorbent—limestone. The by-product gypsum can also be recovered and utilized effectively, making it the most widely used and reliable technology worldwide.
In China, the national power company has identified the wet limestone desulfurization process as the dominant FGD method. However, during operation, the system faces challenges such as abrasion and corrosion caused by circulating limestone and gypsum slurry, along with impurities. When flue gas contains higher levels of SO3, increased dust concentration, and moisture, the corrosion becomes more severe. Over time, fouling and spalling of hard particles develop, increasing equipment wear. Corrosion and wear have long been major issues in desulfurization systems, affecting equipment availability and operational stability. Therefore, improving the corrosion and wear resistance of equipment is crucial for safe and stable operation.
As a key component in fluid control, ceramic valves play a vital role. Advanced ceramic materials, known for their high hardness, strength, wear resistance, and corrosion resistance, have been widely adopted since World War II, especially in military and aerospace applications like rocket nozzles and armor. Structural ceramics differ from traditional ceramics and have evolved to include products like ceramic engines, bearings, watches, scissors, and knives.
China included the development of advanced ceramic materials in its "863" Plan as early as the late 1970s. Although research began in the early 1990s, Jintai Merrill Lynch has actively promoted the application of these materials in China. They focus on developing world-class high-performance ceramic ball valves, which have gained recognition both domestically and internationally. The KW series ceramic valve effectively addresses the two major challenges of high corrosion and high solid content wear in FGD systems.
Made from structural ceramics, the KW series valves offer superior anti-corrosion, wear-resistant, and high-temperature performance, significantly extending service life and reducing maintenance costs. In processes involving limestone slurry, gypsum slurry, and wastewater regulation, the KW ceramic valve is the ideal choice and a strong alternative to imported products. With advanced German design and independent R&D, the valves meet international standards such as GB, DIN, JIS, and API. Their excellent properties make them the best substitute for high-end imported valves and are widely used in desulfurization systems, receiving widespread praise.
Key Features:
- All components in contact with the medium are made of structural ceramic, offering high hardness (Rockwell HRC90) and excellent chemical stability.
- The ball is manufactured using advanced grinding technology, ensuring high roundness and surface quality, paired with ZrO2 ceramic self-lubrication for superior sealing.
- Unlike metal-sealed valves, ceramic valves avoid leakage, torque issues, and corrosion.
- Excellent wear resistance ensures long service life, up to 2–4 times that of titanium alloy or Monel valves.
- Ideal for handling hard particulate media or corrosive liquids, making it the only suitable option for such conditions.
- Compatible with 4–20mA or 1–5V signals, allowing precise control and long-term stable operation.
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