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Plush Mattress,Plush Fabric Mattress,Queen Size Mattress,King Size Mattress SHENZHEN HAIMA FURNITURE MANUFACTORY , https://www.szolucy.com Abstract This article briefly describes the commissioning and normal operating conditions of the tar super centrifuge, and introduces the changes in tar residue and moisture in the tar after use and the new experience of handling emulsified tar and tar uniformity.
Key words Super centrifuge commissioning, removal of tar residue, reduction of moisture
1 Foreword In the atmospheric pressure tar distillation process, the tar can only be processed after pretreatment such as heating, standing, dehydration and homogenization. In the past, coal coking companies used circulating heating and static methods for dehydration and slag removal. The effect was not ideal, causing some tar residues to enter the tar treatment process, which would seriously affect the normal production and secondary evaporator production. Stable product quality.
In order to effectively solve the problems of tar residue and moisture, our company launched two domestic tar super centrifuges in the tar storehouse of the tar workshop in June 2002. After commissioning and operation from July to October, it was put into normal use and achieved good results.
2 Commissioning and operation of the super centrifuge According to the principle of centrifugation, the super centrifuge sends the material to the distribution chamber in the screw feeder through the feed tube. After being smoothly accelerated, the material enters the rotating drum through the outlet of the screw conveyor. The drum rotates, and a concentric liquid layer is formed in the drum shell. The tar residue with high gravity is deposited on the inner wall of the drum and pushed through the screw pusher to the slag outlet to discharge. The tar and ammonia water respectively overflow through the adjustable overflow plate . As shown in Figure 1. The process of putting into operation in July is to put the tar residue into the slag tank and send it to the coal blending workshop for rationing coking. The extracted ammonia tank of the oil depot is used as a super centrifuge to shut down and wash the machine during failure. The middle tank of the tar, and then use the pump to pour each tar storage tank, as shown in Figure 2.
After nearly two months of self-debugging, the following problems were discovered:
(1) When the single machine is blocked, the other one has problems. The main reason is that a frequency conversion pump feeds both machines at the same time. When one machine has a blockage, the other machine will be in excess and the flow adjustment will lag, affecting its normal operation.
(2) Ammonia water can not be used for cleaning in normal shutdown and fault shutdown. Because the steam pump must be started when washing the machine, which causes the temperature of the material in the machine to drop and cannot be effectively cleaned. The next time the machine is turned on, the pressure in the machine is too high to start normally.
(3) The original design did not consider the way out of the ammonia in the underground tank.
(4) The operating parameters provided by the manufacturer at a rotating speed of 3000-3200r / rain are unreasonable. Operating under this condition, the slag is relatively dry, and there is a high pressure on the drum side, which requires frequent washing of the machine.
According to the above problems, the process was redesigned, that is, two tar flow meters were added to show the flow; an ammonia water line was connected from the circulating ammonia water pump head of the recovery workshop to the centrifuge feed pipe to ensure the temperature and pressure of the ammonia water; Return to the tar ammonia clarification tank in the recovery workshop; add an automatic processing system. When a certain machine fails, the ammonia automatic adjustment valve opens the ammonia washing machine, and the super centrifuge feed adjustment valve closes, the raw material return adjustment valve opens, and the raw material returns to the raw material tank After the faulty washing machine is eliminated, it will return to normal without affecting the normal operation of another super centrifuge.
Application of Super Centrifuge in Tar Pretreatment