What are the issues that should be paid attention to when selecting high-pressure pumps for small and medium-sized seawater desalination equipment?
What are the issues that should be paid attention to when selecting high-pressure pumps for small and medium-sized seawater desalination equipment? Author: small and medium sized high-pressure pump is the heart of desalination equipment to provide power for small and medium desalination equipment. In the reverse osmosis desalination system, the investment cost per ton of desalinated water accounted for about 25%, the electricity cost accounted for more than 52%, and the two combined accounted for more than 77% of the water production cost. In the cost of electricity, the energy consumption of the high-pressure pump is the main factor. Therefore, the energy consumption of the high-pressure pump is the main factor affecting the cost of product water. According to different desalination scales, selecting high-efficiency and appropriate high-pressure pumps is the current reverse osmosis seawater desalination. Problems that the industry urgently needs to solve. So what are the issues that should be paid attention to when selecting high-pressure pumps for seawater desalination equipment? Common high-pressure pump forms and scope of application: There are two main types of high-pressure pumps usually used in membrane desalination systems: multi-stage centrifugal pumps and power pumps. Plunger pump in positive displacement pump. Under normal circumstances, multi-stage centrifugal pumps are mainly suitable for large and medium-sized seawater desalination devices, and plunger pumps are mainly suitable for small and medium-sized seawater desalination devices. There is no specific data on the production capacity of large, medium and small seawater desalination. This is due to the high efficiency of plunger pumps and changes in investment trends brought about by the parallel operation of certain plunger pumps, especially for BOO or BOT projects. Consumption comes first. Points to note when selecting high-pressure pumps: Correct selection of high-pressure pumps is the key to safe and economical operation of the system. For the high-pressure pump of a membrane desalination system, whether it is a plunger pump or a centrifugal pump, the first thing to determine is the material of the overflow part, which is to solve the corrosion problem of the pump in the seawater. At present, there are many available materials. Based on economic considerations, 2507 (UNS: S32750) duplex stainless steel is generally used. This is the introduction of the issues that need attention in the selection of high-pressure pumps for small and medium-sized seawater desalination equipment. At present, Reverse osmosis desalination technology has a large market share due to low investment costs, low energy consumption, and low water prices. The high-pressure pump provides energy to overcome osmotic pressure in membrane desalination, and is the heart of the system. High-pressure pumps are mainly divided into centrifugal pumps and plunger pumps. In general, multi-stage centrifugal pumps are mainly suitable for large and medium-sized seawater desalination devices, and plunger pumps are mainly suitable for small and medium-sized seawater desalination devices. It is necessary to select the appropriate pump form according to basic data such as water volume, pump pressure range, and pump performance curve.
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