water ring vacuum pump in papermaking industry application
We all know that the water ring vacuum pump is often used in the paper industry. Today, we will understand the application and problems of the water ring vacuum pump in the paper industry. In the process of pulping and papermaking, there are many processes that need to use vacuum dewatering, such as the vacuum suction tank, the couch roll, the vacuum suction roll, the vacuum pressing section and the upper and lower woolen cloth vacuum suction tanks. It is a common method to make use of the vacuum pumping capacity of the water ring vacuum pump.
There are three indexes to judge whether the type selection of water ring vacuum pump in a pulp and paper vacuum system is reasonable: air extraction, shaft power at working point and matching power of motor. When selecting the water ring vacuum pump, the axial power at the working point of the water ring vacuum pump should be reduced as much as possible on the premise that the pumping power meets the process requirements of the production line, because the smaller the axial power consumed by the water ring vacuum pump, the lower the cost of pulp and paper making. The matching power of the motor is also small, the total installed capacity is small, and the cost of electrical configuration can also be reduced.
In order to reduce energy consumption, save energy and reduce the cost of paper production, the correct selection of water ring vacuum pump is very important.
To illustrate this problem, we first understand the working characteristics of water ring vacuum pump. Water ring vacuum pump is a positive displacement pump. When the type of water ring vacuum pump is determined, its volume is also determined. For the water ring vacuum pump, there are two main factors that affect the pumping capacity: the volume of the pump and the speed of the pump operation.
Causes of scaling of water ring vacuum pump in papermaking industry and effective solutions
With the development of acid papermaking to neutral papermaking, the scaling of water ring vacuum pump is a common problem for every paper-making enterprise. No matter in the South or the north, many manufacturers have encountered this problem in their papermaking practice for many years and are determined to solve it. After a long-term hard exploration, a set of solutions including water ring vacuum pump for pulp and paper scaling control is proposed, which is deeply rooted Welcome to our customers.
Water ring vacuum pump scaling generated by long-term use, with the generation of scaling, its impact on the paper machine is also gradually emerging, so we can not take it lightly, we should persevere, at the beginning of the scaling control and prevention, which will produce long-term benefits.
1. Scaling reason of water ring vacuum pump: water quality influence. High pH value, high hardness; the sealing degree of papermaking white water increases, the content of insoluble matter is high, and the scaling ions are accumulated; a large number of fillers are used; the cooling system is not well used due to the increase of water temperature; the water circulation system is not cleaned and maintained regularly;
2. The adverse effects of scaling of water ring vacuum pump on papermaking were found in the field: serious reduction of vacuum degree and air extraction volume; increase of motor current, resulting in increased power consumption; shaft sticking and difficult start-up; frequent acid washing or manual disassembly not only damage the equipment, but also damage the equipment accuracy, resulting in the vacuum can not be formed or the vacuum degree of water ring vacuum pump is reduced.
3. Effective measures to solve the scaling problem of water ring vacuum pump: the use of scale precipitation control agent can not only solve the scaling problem, but also save water and electricity, save energy and increase efficiency. Using scaling and precipitation control agent can use recycled white water and prevent the motor current from increasing; The cooling treatment of circulating water should be done well, the temperature should be reduced as much as possible, and the closed utilization of water should be strengthened to reduce the loss of liquid medicine; the liquid level of the separator should be well controlled to ensure that the water ring vacuum pump can extract gas as much as possible instead of a large amount of water, so as to reduce the load and the temperature of the pump body; It is strictly forbidden to use strong acid to wash the water ring vacuum pump, which will not only damage the equipment, but also seriously accelerate the scaling speed, which is an irresponsible method;