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Aluminum smelters dense phase conveying technology and improvement of practice


Connected between the storage and buffer tanks, under the control of a pneumatic gate valve material. So the issue is resolved. (3) EG641J-XDN50 pneumatic rubber lined diaphragm valve, we have research that is only from the emptying of its role in the decision to change Q641F a 16PDN100 air seal valve. Drain pipe and valve directly connected to the intermediate compartment and the gas vent pipe elevator separate elevator to solve the gas sealing problems. Drain valve and to greatly increased life expectancy, lower operating costs. Drain well and pressure tank as cone valve and drain valve seal good. Threw in a short time expected, transmission can of material about 18 ~ 20min. Dense phase conveying system 8000t positions after the transformation process shown in Figure 3. * 30 * Light Metals 2004 8 3 controlled dense phase conveying system adjustment and reform program before the pressure of aluminum cans and transmission control process is as follows: According to the dense phase conveying system PLC control program, in the process air pressure holding the valve open the bamboo mat a (35s later) open cone valve for filling a (3s later), the material for a pressure valve to open in former times began to charge high-level gauge began to move a High Level knock barrier (600s later) about a material for the valve off (5s after) poppet valve shut off valve is one a handful of air transport in order to open the valve, the pressure balance valve, valves and materials to help blow the outlet valve of a bamboo mat began to feed the low pressure level meter movement (3o0s later) turn off the pressure balance valve to help blow a valve and outlet valve materials (30s later) Open the material outlet valve, the low material level 0 failures, transportation for more than 25min for a closed delivery valve of a (25s rear) off the material outlet valve, open the beginning of holding the next round of air valve installed material process technology since the original system is not smooth, trouble and problems are more self-control program can only design the corresponding based on the actual situation. Resulting in longer transport the materials and equipment, process control is not coordinated. We modified the system of process, along with programs on the PLC have also been adjusted: pressure air valve is open bamboo mat holding a (40s later) open cone valve for filling a (3s later) cutting open a pressure valve for start install bamboo mat materials began to move r High Level High Level Fault (350s after) a circle for the wind I pass, off the stomach of a pneumatic ram I (5s later) taper off a handful of empty stomach I won off an order of f open transfer valve, pressure balancing valve, to help blow the valve outlet valve and Jun Liu began feeding a wide pressure bamboo mat. Low-level gauge action (200s rear) turn off the pressure balance valve,[link widoczny dla zalogowanych], valves and materials to help blow the outlet valve of a (30s rear) off transfer valve, low material level fault 25 = in holding air valve was opened after the beginning of the next round of equipment the process of high pressure pipeline material limit is set to 0.6Mpa, the pressure controller, once the pipeline pressure of more than 0.6Mpa, the material discharge valve will be closed by the compressed air within the product pipeline material. Until the pressure is lower than 0.6Mpa, the material discharge valve opens, to continue feeding as a way to prevent pipe blocking material. Transformation of the former process,[link widoczny dla zalogowanych], in order to prevent the emptying valve (pneumatic rubber lined diaphragm valves) and taking into account the wear of the exhaust vent pipe is less than other factors to consider as far as possible on the process control tank and pressure from the pipe to drain away, drain valve is opened , tank pressure has been lower than 0.05Mpa, although this may be extended diaphragm life, but a large compressed air consumption. After the transformation, due to diaphragm valve,[link widoczny dla zalogowanych], drain pipes have also been modified, then we do not have to consider whether the emptying of the tank material, low material level maneuver through 200s, while stocks materials basically. Off balance valve, to help blow the valve, the material outlet valve, you can open the drain valve drain, tank pressure �� 0.25Mpa, this reduces compressed air consumption. 4 Conclusion Lanzhou Aluminium Co., Ltd. one hundred and twenty thousand tons of electrolytic aluminum alumina dense phase conveying system is the transformation of a series of improvement has been more stable system operation, the pipeline transmission capacity of 30t / h,[link widoczny dla zalogowanych], reached the design requirements. Practice has proved that aluminum dense phase conveying technology for material handling is successful,[link widoczny dla zalogowanych], after the introduction of domestic, despite the localization of more than ten years of research and development. Has become a relatively mature technology, but the actual application are different. There are many aspects to explore in practice we should improve. If the original design of the two 10m. Aluminum pressure tank rotation transmission, transmission distance is less than 300m, the compressed air consumption of 80Nm/rain, and we are in the same situation as the compressed air consumption 120Nm3/rain. Air consumption is too large, and the flow rate of the pipeline faster, plug flow is not well formed and so on. This requires that we continue to study in future work to improve. References: [1] Lan Aluminium Co., Ltd. environmental management, energy-saving technological transformation project preliminary design second [z] 2000. [2] Thirty l of your aluminum dense phase conveying [z]. [3] Lan Aluminium Alumina Storage Systems Practice [z] (Editor Liu where) shrews, shrews,

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