Special application of compressed air in equipment maintenance

Song Hongxian's compressed air is widely used in steel mills. The common compressed air of Panzhihua Steel's vanadium steelmaking plant is mainly used for secondary casting secondary cooling and equipment cooling. The degassed dehydrated compressed air is mainly used as the driving and control gas source. Compressed air has the characteristics of vacuum effect during volume expansion and release during release. Applying these features can solve some of the more difficult problems in equipment maintenance.

The secondary cooling water of the slab continuous casting machine is mainly supplied to the crystallizer and the fan-shaped section for cooling and casting. Through six main branches, each main branch pipe is called 1 zone and distributed to each equipment, and then sprayed onto the casting blank by the nozzle. Due to the poor quality of the cooling water, it is in use. Each branch pipe tends to accumulate mud-like dirt, resulting in insufficient flow of cooling water in each segment, and the nozzle is washed up and severely blocks the nozzle.

The slab continuous casting machine adopts a regular maintenance system. Therefore, the pipe joints on the fan-shaped water spray frame can only be removed during the fixed repair, and the direct flushing water can flush out the debris in the pipe at a large flow rate. Some branch pipes, such as the narrow surface of the crystallizer, have a small flow, but the pipeline is thick. When flushing, the water flow can only pop out about 5,1 of the pipe mouth; some of the main branch pipes are connected with more segments, such as the 6th zone, which connects 8 to 13 The segment has a total of 6 segments, and the pipe diameter of the main branch pipe is only 50. The diameter of each pipe is 40. The 10 to 13 segments at the end when flushing are basically waterless. therefore. The effect of direct flushing is very poor. Only a few branches can play a limited role. When flushing can't solve the problem. Only professional cleaning companies can use the water pressure gun to clean the pipeline. The inspection and repair volume is 44. The cost is high. It is difficult to coordinate the production and maintenance time.

The dirt on the pipe wall is mostly sludge-like and the structure is relatively soft. The removed sample can be washed away with water. The reason for the poor flushing effect is that the water flow rate and flow rate are too low. There is no requirement to flush the dirt from the pipe wall. If compressed air is introduced into the water stream, it will have the following effect: volume expansion after the compressed air is released. The pressure flow rate in the branch pipe will greatly increase the airflow mixed with water in the pipeline, forming a large number of bubbles in the water, and the bubble is dynamically generated and shattered during the flow, thereby generating local blasting force and good stirring. . This is similar to the cavitation mechanism of a water pump impeller.

To this end, compressed air is introduced in the front of each branch pipe. 20, the compressed air is flushed into the water at the same time, and the water flow velocity from the nozzle is greatly increased. The crystal water can be sprayed out of the nozzle 34, 1 far, 10 segments. It is also possible to squirt 21!1 to the 13th. The jet water flow is obviously turbulent, and the flow velocity fluctuates greatly. The stirring effect is obvious. At the beginning of each flush, the water flow is muddy and gradually becomes a clean water flow. The flushing effect is good.

After the water-gas mixing and rinsing method is adopted, the effect of the stable operation of the equipment to improve the operation time of the equipment is significant.

After the technical transformation adopts the water-gas mixed washing method, the maintenance of the 4th rule can be achieved. Only need to clean the secondary pipe thoroughly by the professional cleaning company during the annual overhaul. You can ask the professional cleaning company about 8 times a year, which can save the maintenance time 36.

The water-gas mixed flushing pipeline is easy to operate, and the flushing can be arranged frequently, thus saving a lot of maintenance time on the pipeline.

2. Air curtain sealing to improve the dust removal effect The function of the dust removal hood in the slab is to accommodate the smoke generated when the intermediate tank is tilted, and then the dust in the hood is removed by the dust removal pipe below the hood rail. When the intermediate tank is tilted, the dust hood car is driven from the standby position to the top of the middle package tilting device, and the dust hood is retractable, and the length of the dust hood is adjusted by the hood driving mechanism on both sides to ensure that the full cover is overturned. Device.

When put into production, the dedusting effect of the medium-pack dust removal device is not good, the smoke escapes a lot from the bottom of the dust-removing hood, and the smoke above the track away from the suction port is the most serious. The reason for this is that there is about 20,1 between the dust cover and the track! The neutral gear cannot extend the dust cover due to the presence of the wheel, and the seal is not strict.

When the compressed air is injected, the air having the vacuum effect jet is affected by the frictional force. Driving nearby air molecules to flow in the direction of the jet. Thereby, a negative pressure is formed in the vicinity of the jet. If the exhaust air jet is arranged side by side, a negative pressure surface can be formed above the ejection opening. Air on both sides of the negative pressure surface will be drawn to the end of the jet. According to this, two air pipes of milk 0 are installed inside the track of the dust-removing hood. The holes are 2, 1 drilled in the diameter of the pipe, and the direction of the holes is biased toward the inside of the car. 20. Arrangement of the jet pipe 1.

An effective sealing air curtain is formed on the inner side of the dust cover wheel, and the smoke diffused to the vicinity of the wheel is drawn into the dust removal cover by the sealing air curtain, and the smoke dust escape is effectively suppressed, and the dust removal effect is obviously improved.

Application on the casting machine. It is difficult to solve in a simple way, reducing maintenance costs and saving maintenance time. W08.0624 1Edit Wang Qi equipment management and maintenance 2008 he 6EB

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