Steam Trap Manufacturer Customization

Product Details

I. Features

During the boiler start-up process, when the steam turbine is warmed up with steam, there will be more steam entering the condenser. If a certain vacuum is not established in the condenser, the steam-water mixture entering the condenser will cause positive pressure, damaging the equipment. Establishing a vacuum in the condenser is an indispensable condition for the steam turbine to start. Condenser and some low-pressure equipment (like condensate pumps, sludge pumps, and some low-pressure heaters, etc.) are in a vacuum state internally during normal operation.    Due to the loose piping and shell, air leaks in, thereby destroying the vacuum of the condenser and posing a risk to the safe and economic operation of the steam turbine. At the same time, the partial pressure of air in the condenser increases, leading to a higher dissolved oxygen content in the condensate, which exacerbates corrosion of the thermal equipment and piping. 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, thereby increasing the factory's power consumption. Therefore, it is necessary to continuously remove air from the condenser during operation.

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

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

In modern power plants, jet vacuum pumps are widely used due to their compact layout, simple structure, ease of 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 working principles of these two types of pumps are essentially the same, with the only difference being 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 often use steam jet vacuum pumps. For high parameter, large capacity units, since they all use slide parameter startup methods, there is no possibility of having an adequate steam source to supply the steam jet vacuum pump before the unit starts up. Moreover, it is necessary to use throttling from high-pressure steam to...1.2-1.6MPaThe steam ejector with pressure supply is clearly uneconomical, and to recover the working fluid, an ejector 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-ring vacuum pump system. It consists of a water-ring vacuum pump, water-ring pump, water-ring tank, and connecting pipes. The exhaust from each low-pressure heater, the condensate pump, and the drain pump are collected through exhaust pipes and fed into the condenser, which is connected to the working chamber of the water-ring vacuum pump. Water from a circulating water system or a deep well is pressurized by the water-ring pump (one in operation and one as a standby) and then injected into the water-ring vacuum pump. The high-speed water jet emitted from the nozzle in the pump creates a high vacuum in the working chamber, thereby extracting the gas-vapor mixture from the condenser. This mixture is then expanded and returned to the water-ring tank.

Section 3:Model Description

Section 4: Product and Equipment Matching Table