Coal slurry pump working principle and fault maintenance

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. At present, most of the high-pressure coal slurry pumps used in the gasification plants of the enterprises are diaphragm reciprocating pumps. There are mainly two types from the structure of the cylinder block: the three-cylinder diaphragm reciprocating pump and the four-cylinder diaphragm reciprocating pump, the motor Rotate the pistons that drive each cylinder through the gearbox gear train to reciprocate the pistons.

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 not stable, 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.

Coal slurry pump common faults:

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, it needs to be replaced; be sure to confirm the indicator light bulb is good or bad before replacement, to prevent the light bulb filament short circuit, otherwise Because the short circuit insurance burn, resulting in jumping.

2, gas-controlled valve shaft seal oil leakage during driving, serious oil spill will lead to the cylinder does not look after, 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 an intact air control valve

(2), stop Y9 valve insurance

(3), the equipment to do the appropriate treatment, the oil leakage corresponding to the valve cylinder exit, and to reduce the load handling

(4), the corresponding solenoid valve pneumatic valve manual, gas control valve gas source

(5), quickly replace the air control valve

(6), restore the solenoid valve manual, check whether the connection is tight, without leakage

(7), restore Y9 valve insurance, filling the cylinder, check the tubing is spilled

(8), notify the operator is completed, process adjustments, to restore the production load

3, the gas-controlled valve diaphragm during the car a bad leak, the diaphragm will cause a serious air leak gas valve closed lax, resulting in excessive fuel tank or lack of oil, if lack of oil will cause the cylinder is not rated properly, affecting the transportation of coal The amount of slurry, thereby reducing the production load; if not handled in time will lead to diaphragm damage, resulting in forced parking, so the diaphragm should be timely and timely replacement of the diaphragm to deal with air leaks, without changing the diaphragm in the case of parking process as follows:

(1), to prepare a good gas control valve diaphragm

(2), stop Y9 valve insurance

(3), equipment to deal with, corresponding to the gas leakage valve out of single-cylinder, and to reduce the load handling

(4), the corresponding solenoid valve pneumatic valve manual, gas control valve gas source

(5), quickly replace the diaphragm of the air control valve

(6), restore the solenoid valve manual, check whether the connection is tight, without leakage

(7), restore Y9 valve insurance

(8), notify the operator is completed, the process for load adjustment, resume production

Coal slurry pump failure prevention and maintenance:

In order to further maintain the coal slurry pump and promote the stable operation of the coal slurry pump and reduce the failure rate during driving, the weekly inspection and maintenance of the coal slurry pump and regular inspection work must be done.

1, before each preparation for driving, test lights and drop test, found that the problem is handled in time, the accident eliminated

In the budding state.

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, oil spill caused the system to stop.

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.