Discussion on the lockfight problem
Thread Content
There are two scenarios for conducting a no-load test with the lock hopper in operation: 1) no-load test with water, and 2) no-load test without water. Is it necessary to start the circulation pump of the lock hopper during the no-load test?
Generally, a dry test with water is carried out, which provides a good assessment of the control of the entire lock hopper. In my opinion, it’s best to start the circulation pump.
Generally, it is tested with water, using high-pressure water jets. It mainly depends on how the pressure holding works.
Generally, a water test is carried out; as for the circulation pump, it can start or it may not – these fish vaporization furnaces are two separate units.
Try to simulate actual operating conditions; it is recommended to keep the hopper circulation pump running.
Of course, test it by driving together. It’s possible to simulate driving conditions, and we also tested the pump at the same time.
The key is to streamline the process and check for leaks in the pipelines.
I would like to ask about common faults in the lockfighting system and their solutions
One of them is that the valve does not close properly, which is really troublesome and scary!
The upper and lower sealing valves of the slag lock tank need to be opened and closed repeatedly, so careful attention should indeed be paid when selecting them. Production also takes place domestically, but factories generally give priority to imported products ； The slag lock tank is a device that is subject to alternating stresses; therefore, attention must be paid to the integrity of the welds during maintenance ； Since the medium is slag, the erosion of the lining needs to be checked ； For the above reasons, the connection flange may leak; it is necessary to check that it is properly tightened.
Most lockhopper trips caused by valve failures are due to problems with the actuator, and internal leakage of the valve is also a common issue. For the actuator, one can contact the instrument maintenance team; as for valve internal leakage, it is necessary to determine exactly where the leakage occurs, and each case should be analyzed on its own.
The most common problems with lockout devices are internal leakage of the valves, valve jamming, and issues with the actuators; to address these, it is necessary to involve both the instrumentation team and the maintenance staff.
1. The lockhopper valve is stuck, and the valve does not operate properly； 2. The lock slag valve at 1.2.3 is blocked, making it difficult to collect and discharge slag in the lock hopper ； 3. Internal leakage in the lockhopper valve.
1. Plugging of the check valve and internal leakage due to scouring; 2. Distorted indication of the level gauge (material level gauge); 3. Incomplete pressure relief or prolonged duration of such relief; 4. Easy detachment of internal components
Especially for valve 2, which wears out more severely due to frequent operation, the common practice is 1. Swap 2 valves
The upper part of valve 1.2 tends to get clogged, and valve 3 is also severely clogged. Internal leakage in valves is quite common.
The main problem is that slag tends to accumulate inside the valve chamber, making it difficult to operate the valve; this may be related to an excessively short slag removal time, which results in residual slag remaining.
1. Leakage in the slag collection valve of the lock hopper: Solution – replace the valve. 2. Leakage in the slag discharge valve of the lock hopper: Replace the valve. 3. Insufficient flow rate of the pump in the lock hopper: Check the pump itself as well as the inlet and outlet valves. 4. Severe erosion of the slag discharge valve: Conduct regular inspections. 5. Vibration in the pipelines of the lock hopper: Add more supports and fixing points
For the system airtightness test, doesn’t every pump need to be operated?
Try one piece. This not only allows for testing the airtightness but also checks the operation of the valve at the same time.