This is called installing a degasser in the high position.
The degasser is arranged above the water supply pump, and there is a drop of at least ten meters. This is to form a certain pressure head at the inlet of the feed water pump to prevent the vaporization of hydraulic fluid from causing cavitation damage to the feed water pump. Since the pressure at the suction end drops instantly when the water pump starts, the gas in the water will precipitate when the pressure decreases and enter the water pump to form cavitation.
Nowadays, there are degassers installed at low level, which requires adding an anti-cavitation device to the water outlet of the equipment, saving the cost construction of a high installation platform.
What is the purpose of chemical water replenishment in power plants?
When the unit is restarted, a large amount of air accumulates in the radiator. Opening the exhaust gas can discharge these gases as soon as possible, ensuring that the radiator can be heated well in the initial stage. operating conditions to avoid greater thermal stresses causing radiator leaks. Normal exhaust involves exhausting non-condensable gas from the steam side of the heater to ensure efficient heat exchange.
The main function of the deaerator is to remove oxygen and other non-condensable gases from the boiler feed water to ensure the quality of the feed water. If oxygen is dissolved in water, the metal in contact with the water will be corroded. At the same time, if there is gas accumulation in the heat exchanger, the thermal resistance of heat transfer will increase and the heat transfer effect of the equipment will increase. reduce. Consequentlyent, any gas dissolved in water is unfavorable, particularly oxygen, which will directly threaten the safe operation of the equipment. Thermal deaeration is used in thermal power plants. The deaerator itself is a hybrid heater in the water regeneration system. At the same time, the high pressure heater is used for dehydration, chemical water replenishment and high pressure dehydration and exhaust with qualified equipment. water quality throughout the plant. It can be fed into the degasser to be used to reduce the loss of steam and water in the power plant. 1. The working principle of headless degasser: After the main condensate (including supplementary water) of the low pressure heater is adjusted by the water inlet regulating valve, it enters the degasser, mixes with other degassers in the degasser and passes through the nozzle or tubThe porous ejects to form an umbrella-shaped water film, which performs mixed heat and mass transfer with the heating steam from bottom to top. The feed water quickly reaches saturation temperature under operating pressure. At present, most of the dissolved oxygen and other gases in water are basically analyzed, thereby achieving the goal of removing oxygen.
The role of chemical water make-up in power plants: optimizing the operation of the water make-up system.
There are mainly two advantages:
1. The first advantage is that if the make-up water enters the condenser throat as a spray, some of the exhaust steam will condense here. , and Reducing the amount of steam discharged to the condenser not only reduces the loss of cold sources, but also increases the condenser vacuum. Cir makeup waterflows through the low pressure heaters at all levels with the main condensed water. , realizing step by step heating and increasing energy efficiency with low power consumption. High-energy steam extraction from the low-pressure degasser and high-pressure degasser is reduced, improving the thermal economy of the unit.
2. The second advantage is that preliminary removal of oxygen can be achieved in the condenser, thereby reducing the degree of oxygen corrosion of low pressure heating equipment. During operation, the temperature of the desorbed water is low and. dissolved oxygen is greater than 60ug/l.