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According to Ye Ding, P series double-stage push-pull centrifuges are mainly used for solid-liquid separation. They are manufactured through the introduction of patented technology from Swiss Sulzer Ethewes, and are one of the most advanced push-pull centrifuges in the world today. Based on the introduction, Zhejiang Light Machinery has continuously carried out technological innovations in the past 20 years, and this product has always maintained the leading domestic level. For example, in the production practice, the company adopts a titanium tube method at the front end of the feed shaft, which completely solves the problem that the feed shaft is easily corroded when the seal fails. The newly designed feed device not only greatly speeds the material feed rate. Accelerate, but also reduce the speed difference between the material and the screen, so that the grain of the material is not easy to crush, improve the separation efficiency; developed air flow solids collection device to reduce the impact of particle breakage caused by high-speed discharge of the centrifuge; The formed annular fluidized bed greatly reduces the residual moisture content of chloroacetic acid and improves product quality.
The equipment has high separation efficiency and large production capacity and is difficult to substitute for other products in the domestic market. For example, the P-500 centrifuge is four times the separation capacity of the same power WH-800 centrifuge. In terms of chloroacetic acid separation, the 15,000 ton/year production line can be equipped with only one P-500 centrifuge. The residual moisture content of the equipment also has significant advantages. For example, the P-500 centrifuge is used for salt separation. The residual moisture content of the product is only 1.9%, which can greatly reduce the energy consumption of the subsequent drying process. In addition, the separation effect of the equipment is good, more than 80% of the mother liquor is separated on the first stage drum, so the power consumption is small, and the power consumption per ton of material is reduced from 7.5 kWh of the WH-800 model to the P-500 model. 3.5 kWh.
At present, the P series two-stage pusher centrifuges produced by Zhejiang Light Machines have four models, P-40, P-500, P-60 and P-85, which can meet the needs of various scales of production and are small enough for pilot production. Segregation of products as large as 1 million tons. In addition to the separation of chloroacetic acid, this series of centrifuges are also used in vacuum salting, mirabilite extraction, ammonium chloride separation, ammonium sulfate dehydration, salt and alkali separation, potassium chloride separation, denitrification of nitrocellulose, and extraction of lysine. Other aspects have been widely used. At present, the equipment is not only selected by many domestic enterprises such as Shuanghuan Technology, Juhua Group, Salt Lake Potash, Chongqing Tianyuan, but also exported to Malaysia, South Korea, Egypt, Jordan and other countries.
For separation equipment, users are most concerned about the separation effect. The P series double-stage pusher centrifuge produced by Zhejiang Light Industry Co., Ltd. has a high reputation in the chloroacetic acid industry due to its high separation efficiency and low residual moisture content. Not long ago, taking the opportunity of the China chloroacetic acid product technology and market seminar in Hangzhou, the reporter interviewed Ye Ding, the deputy general manager of Zhejiang Qingji Industry Co., Ltd.