What Is the Complement System?

A condensate replenishment tank is generally set in a unit to provide the system with start-up and operation water, and to act as a regulating container when adjusting the water level of the condenser and deaerator. The make-up water of the unit comes from the demineralized water in the chemical water treatment workshop, and is automatically controlled by the pneumatic regulating valve into the make-up water tank. The makeup water system consists of makeup water tanks and makeup water pumps. ^[1]

Make-up water refers to the water taken away by the supplementary product and the evaporation loss during the washing process. Refers to the water that needs to be continuously replenished in the circulating cooling water system due to evaporation, wind blowing, leakage and sewage loss. ^[2]

The main condensate system is generally composed of main equipment such as condensate pump, shaft seal heater, low pressure heater and its connecting pipeline. The subcritical pressure and supercritical pressure parameter units have high requirements on the feedwater quality of the boiler (especially the once-through furnace), and a desalination device is installed behind the condensate pump. For large units, the main condensate system also includes a make-up water system consisting of make-up water tanks and make-up pumps. A condensate replenishment tank is generally set in a unit to provide the system with start-up and operation water, and to act as a regulating container when adjusting the water level of the condenser and deaerator. The make-up water of the unit comes from the demineralized water in the chemical water treatment workshop, and is automatically controlled by the pneumatic regulating valve into the make-up water tank. When the unit is started, the replenishment pump is used to complete the replenishment of the condensed water, the boiler water supply through the flow orifice, the seal water for the pump during the start-up, and the pipeline filling. During normal operation, the bypass valve of the makeup water pump is opened, the makeup water pump is stopped, and the water is replenished automatically by the pressure difference between the makeup water tank and the condenser. ^[1]

The water level of the condenser hot well is controlled by a regulating device arranged on the supplementary water pipeline before the condenser. The device is provided with two main and auxiliary regulating valves. During normal operation, the hot well water level signal automatically controls the supplementary water volume through the main regulating valve to maintain the condenser water level. When the water level is low, open the main regulating valve; when the water level continues to drop and the low water level signal alarms, Quickly open the bypass auxiliary valve to increase the amount of water. When the high water level appears in the hot well, close the small regulating valve; when the water level continues to rise, open the high water level regulating valve in front of the shaft seal heater, and the condensate returns to the condensate pump, desalination device and condensate booster pump Make up the water tank. A pipe connected to the water supply pipe in front of the flow measuring device leads to the deaerator, which can directly supply water to the deaerator. This pipe is equipped with a check valve near the deaerator to prevent the steam in the deaerator from pouring into the condensate system and causing piping vibration. ^[1]