Leakage of the atomization pipe and valve: The atomization pipe is mainly used to make the compressed gas evenly enter the warehouse pump to achieve the purpose of uniform mixing of gas and ash, so that the unit volume concentration is close to the average value. For example: the air intake speed of the atomization tube is accelerated due to wear and leakage, resulting in poor mixing of ash and gas. After entering the ash conveying pipeline, the resistance of each part of the pipeline varies greatly, resulting in unstable flow rate. When the ash concentration in a certain place is high and the resistance is greater than the force acting on it, the pipeline will be blocked, so the atomization tube should be regularly checked and replaced.

The pneumatic valves on the pump body are not leaking tightly. When the valve leaks, on the one hand, the pressure head cannot reach the ash conveying speed due to the leakage during the conveying process; on the other hand, the air and ash are mixed unevenly, and the pipe is eventually blocked.

The influence of ash storage: Improper adjustment of the ash storage distribution valve or operation error will cause excessive resistance and pipe blockage. The position should be corrected immediately. Operation error is mainly manifested as the error of closing or closing first. The reason why the ash storage bin is full of ash is that the amount of ash input is greater than the amount of ash output. When the ash container is full of ash, the excess ash can clog the pipe. In addition, due to the long-term operation of the ash yard. The surrounding area hardens, leaving only a small channel in the middle. The formation of a vertical shaft results in an increase in the back pressure of the ash storage yard.

The level gauge is malfunctioning. Since the level gauge used in the pump is highly accurate, it is very important to adjust the level gauge. If it is too sensitive, it will cause too little ash from the silo pump; if the sensitivity is not adjusted enough, too much ash will be sent to the silo pump, which reduces the fluidization space in the silo pump, and the ash concentration is relatively large, which may easily cause pipe blockage. The ash intake of the silo pump is controlled by a time relay and a level gauge. In order to maximize the ash conveying capacity, from the perspective of energy saving and consumption reduction, the level control should be given priority, so the accuracy of the level indicator is more important. During the adjustment process, the level meter should send out a delay signal. If the signal still exists after the delay, it means that when the material is full, the feed valve is closed.

The pressure gauge is malfunctioning. The pressure gauge on the pump plays a key role in the entire operation control process. Whether it is normal or not directly affects the operation and fault judgment of the system. During operation, the pressure gauge limits its upper limit pressure and controls the opening of the exhaust valve; during transportation, monitors the pressure changes during transportation to show whether the state of fly ash transportation in the pipeline is stable and continuous; when the pipeline When the pressure drops to the lower limit, the conveying process ends. Therefore, the pressure gauge directly or indirectly affects the opening and closing of the valve.

Other effects:

The material of the exhaust valve and sealing ring is unreasonable. Unreasonable selection of drain valve. Common discharge valves include plug-in hard-seal discharge valves, plug-in soft-seal discharge valves, hemispherical discharge valves, soft-seal butterfly valves, and hard-seal butterfly valves. Pros and cons. The design of the ash conveying pipeline is unreasonable, and there are too many slopes and bends in the pipeline, which affect the stability of the ash flow pattern in the pipeline.

The leakage of the "four pipes" of the boiler caused the increase of moisture in the ash. Once the ash temperature is low, the flue gas is easy to condense, increasing the conveying resistance and causing pipe blockage.