Coal slurry pump principle is the use of high-speed rotation of the rotor to transfer momentum to the gas molecules, so that the directional speed, which is compressed, was driven to the exhaust port for the previous stage after a vacuum pump. Coal slurry pump works: 1, most of the high-pressure coal slurry pumps used in gasification plants are diaphragm reciprocating pump, there are two main types from the cylinder structure: the three-cylinder diaphragm reciprocating pump and four-cylinder Diaphragm reciprocating pump, the motor rotation through the transmission gear drive mechanism for each cylinder piston, so that the piston reciprocating motion. A single cylinder as an example to introduce the action of the process (shown below): reciprocating piston using the drive fluid incompressibility, through the drive fluid pressure transfer to the diaphragm, the diaphragm expansion or contraction, and then use the one-way valve action , To achieve the inhalation of coal slurry and shot. From the perspective of the action of a single cylinder, the suction and discharge of coal slurry in each cylinder are intermittent, so the delivery of coal slurry can be said to be pulsed, the output pressure is unstable, in order to solve the problem of pressure instability, In a cycle evenly distributed piston advance, so that the piston at the same time to avoid forward or retraction, which can effectively stabilize the pressure of the coal slurry pump outlet, and then set in the coal slurry pump buffer tank, to further stabilize the outlet pressure. 2, drive fluid supply system. In each cylinder, set the cylinder diaphragm rod position detection probe, the use of the diaphragm connected to the rod movement of the magnet to trigger the drive fluid is normal. When the probe detects the signal, send a message to the PLC system, the PLC control solenoid valve switch, and then control the pneumatic valve for oiling or oil discharge, so that the cylinder drive fluid in a normal state. Drive fluid supply system can detect whether the drive fluid is normal, and then automatically realize the injection of oil discharge action to protect the normal operation of the cylinder, while protecting the diaphragm, to prevent membrane damage. 3, the role of the probe: real-time monitoring of the cylinder drive fluid is normal (lack of oil or over oil), trigger the probe through the magnetic ring. (1) When the driving fluid in the cylinder is normal, the reciprocating motion of the magnetic ring on the rod moves in the interval as shown in Fig. 1. (2) When the driving fluid in the cylinder is lack of oil, the reciprocating motion of the magnetic ring on the rod moves in the interval as shown in Fig. 2. During one cycle of the reciprocating motion of the rod, the magnetic ring moves once below the oil- Trigger the oil probe closed control to the cylinder oil, until the normal drive fluid stop oiling. (3) When the driving fluid in the cylinder crosses the oil, the reciprocating motion of the magnetic ring on the rod moves in the interval as shown in Fig.3, and the magnetic ring moves once below the oil discharge probe during one cycle of the rod reciprocation , Trigger the oil discharge probe closed control to discharge oil from the tank to the tank until the drive fluid is normal to stop the oil discharge. Common failure of coal slurry pump: 1, the indicator is bad: press the test light button to check the status of the indicator light, if it is found that the indicator light is bad need to be replaced; pay attention to be sure to replace the indicator light bulb before and after, in case Bulb filament short circuit, otherwise it will result in short circuit insurance burned, resulting in jumping. 2, gas-controlled valve shaft seal during the oil spill, a serious oil spill will lead to the cylinder does not take into account, affecting the delivery of coal slurry volume, thereby reducing the production load, the need to replace the shaft seal without stopping: or diaphragm: (1 ), Prepare a good air control valve (2), stop Y9 valve insurance (3), the equipment to do the appropriate treatment, the corresponding oil leakage valve cylinder exit, and for the reduction of load handling (4) Valve solenoid valve manual, gas control valve stop gas (5), quickly replace the gas control valve (6), restore the solenoid valve manual, check whether the tight connection, no leakage (7), restore Y9 valve insurance, to the cylinder Within the oil, check the tubing is leaking (8), notify the operator is completed, the process for adjustment, to restore the production load 3, the valve during the car bad gas leak, bad diaphragm will lead to serious air leakage valve closed Insufficient, resulting in excessive fuel tank or lack of oil, if the lack of oil will result in poor cylinder load, affecting the delivery of coal slurry volume, thereby reducing the production load; if not promptly lead to diaphragm failure, resulting in forced parking, so the film Bad air leaks need to be replaced in time to deal with the diaphragm, the situation does not stop Under the diaphragm replacement process is as follows: (1), to prepare a sound control valve diaphragm (2), stop Y9 valve insurance (3), the equipment to deal with the corresponding gas-leaking pneumatic valve single cylinder exit and (4), the solenoid valve corresponding to pneumatic valve manual, gas control valve stop gas (5), quickly replace the diaphragm (6), to restore the solenoid valve manual, check whether the tight connection , No leakage (7), to restore Y9 valve insurance (8), notify the operator is completed, the process for load adjustment, to resume production of coal slurry pump failure prevention and maintenance: In order to further maintain the coal slurry pump, Pump stable operation, reduce the failure rate during driving, we must do a good job in coal slurry pump weekly inspection and regular inspection. 1, Before each preparation for driving, test lights and airdrop test, found that the problem is handled in time, the accident eliminated in the bud. 2, to develop a reasonable gas diaphragm and shaft seal valve life cycle, regular replacement, try to avoid the possibility of damage during driving and reduce the impact on the system. 3, regularly check the pressure controller, pressure controller does not meet the requirements of replacement, to avoid damage caused by the pressure controller during driving caused by parking. 4, Regularly check the fastening cable wiring and trachea, tubing joints, to avoid poor contact or cable due to leakage, leakage caused by the system parking. 5, regular inspection and commissioning of interlocking devices to confirm the value of interlocking and interlock protection reliability, regular inspection of the coal slurry pump during driving, found the problem promptly handled to avoid the problem to expand.
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