Water Jet Vacuum Pump Manufacturer Customization

Product Details

I. Features

During the boiler startup process, when the steam turbine is warmed up by the steam, more steam will enter the condenser. If a certain vacuum is not established within the condenser, the entry of steam and water into the condenser will cause the condenser to develop positive pressure, damaging the equipment. The establishment of a vacuum in the condenser is an indispensable condition for the steam turbine to start up. Condenser and some low-pressure equipment (like condensate pumps, deaerating pumps, and some low-pressure heaters, etc.) are in a vacuum state internally when operating normally.    Due to the looseness of the pipes and casings, air leaks in, thereby破坏 the vacuum of the condenser and posing a threat to the safe and economic operation of the steam turbine. Simultaneously, the partial pressure of air in the condenser increases, causing the dissolved oxygen content of the condensate water to rise, thereby exacerbating corrosion of the thermal equipment and pipelines. The presence of air also increases the thermal resistance in the heat exchanger, affecting the cooling of the steam turbine exhaust by the circulating cooling water, leading to increased power consumption. Therefore, air must be continuously removed from the condenser during its operation.

In summary, the vacuum system's purpose is:①Establish condenser vacuum at the initial stage of unit start-up②Maintain the condenser vacuum during normal unit operation to ensure safe and economic operation of the unit. The main vacuum removal equipment for the condenser includes vacuum pumps and vacuum ejectors. The water-jet vacuum ejector system is widely used in domestic large and medium-sized units due to its simple design and reliable operation.

Section 2: Structure and Working Principle of Water Jet Vacuum Pump

In modern power plants, the widely used vacuum pump is the jet vacuum pump, which boasts compact layout, simple structure, easy maintenance, reliable operation, and the ability to establish the required vacuum in a short period of time. Jet vacuum pumps can be divided into steam jet vacuum pumps and water jet vacuum pumps based on the working medium. The basic principle of these two types of vacuum pumps is the same; the difference lies in the working medium. The working medium for steam jet vacuum pumps is pressurized steam, while for water jet vacuum pumps, it is pressurized water. Small capacity units mostly use steam jet vacuum pumps. For high parameter, large capacity units, due to the use of slide parameter startup methods, there is no possibility of having sufficient steam supply for steam jet vacuum pumps before the unit starts up. Moreover, it is necessary to use throttling from high-pressure steam1.2-1.6MPaPressure steam injection vacuum pumps are obviously uneconomical, and to recover the working substance, a steam injection cooler also needs to be installed, which complicates the thermal system. Therefore, Currently, large capacity units in our country are equipped with water jet vacuum pumps, which are mainly composed of working water inlet, working nozzle, mixing chamber, expansion tube, and check valve, etc.

Water Jet Vacuum Pump System. It consists of a water jet vacuum pump, a water jet pump, a water jet tank, and connecting pipes. The exhaust from each low-pressure heater, the condensate pump, and the bleed pump are collected through exhaust pipes into the condenser, which is connected to the working chamber of the water jet vacuum pump. Water from the water jet tank, supplied by the water jet pump (one in operation and one as a standby), is pressurized and then injected into the water jet vacuum pump. The high-speed water jet emitted from the nozzle in the pump creates a high vacuum in the working chamber, extracting the gas-vapor mixture from the condenser. This mixture is then expanded and returned to the water jet tank.

III.Model Description

Section 4: Product and Equipment Matching Table