**Reforming the Air Supply Duct of a Clean Coal Filter Press: A Practical Case Study** In the coal preparation plant, the air supply system of the clean coal filter press often faces issues due to the presence of fine coal slurry in the air source. This contamination leads to improper functioning of various valves, resulting in shortened service life and disruptions in normal production. To address these challenges, a series of improvements were implemented, including purifying the air source, separating the control and working air lines, and replacing pneumatic butterfly valves with ball valves. These changes significantly improved the operational efficiency of the filter press and extended the lifespan of the valves, ultimately delivering substantial economic benefits. **1. Introduction to the XMZG100/1090-U Type Filter Press** The clean coal filter press used in the coal preparation plant is the XMZG100/1090-U diaphragm automatic filter press. It is equipped with an automated control system that works in conjunction with the gate valve in the blow press system. Both systems utilize pneumatic butterfly valves. The compressed air generated by the pressure fan is directed through three wind bags into a main line, then distributed to the press and blow system of three pressure filter tanks and three clean coal filter presses. Each air supply line is fitted with a shut-off valve and a check valve. The pneumatic butterfly valve is controlled by a solenoid valve, and the working air line for the solenoid valve is referred to as the control system. Figure 1 shows a schematic diagram of the clean coal filter press air supply system. **2. Problems Before the Upgrade** As shown in Figure 2, the original air piping system for the pressure fan was theoretically sound, but in practice, it experienced frequent failures and could not operate smoothly. After six months of operation, four major issues were identified: (1) The air duct intersected with the coal mud pipeline, causing coal slurry particles to mix with the air source. These fine particles often clogged the solenoid valve, preventing the pneumatic butterfly valve from operating correctly. (2) Fine coal slurry tended to settle in areas where flow was restricted, leading to the butterfly valve's gate becoming stuck. Frequent movement of the gate caused more buildup, making it increasingly difficult to operate. This also affected the solenoid valve, triggering error messages. (3) The shut-off valve failed to function properly due to the accumulation of fine coal slurry. A small amount of slime water could enter the air duct in reverse, contaminating the gas source. (4) When the level gauge malfunctioned, slime water from the concentrate tank could flow into the pressure blower via the shut-off valve, polluting the gas source and causing all solenoid valves to fail, which in turn prevented the pneumatic butterfly valves from working. **3. Improvement Measures** To resolve these issues, several measures were taken, including purifying the control air source, separating the control and working air lines, and modifying the air piping. These changes greatly improved the reliability and efficiency of the system. For further information or assistance, please contact Mr. Wu at 13760177211 or email @163.com.
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