The shaft seal heater and shaft seal cooler are used to extract the steam and gas mixture from the steam seal system of the steam turbine, preventing steam from flowing from the end steam seal to the turbine room and oil system, polluting the environment and damaging the oil quality. These vapor compounds enter the shaft seal cooler and are cooled into water, heating the condensed water. The remaining uncondensed gas is discharged into the atmosphere.

The shaft seal heater is also known as the shaft seal cooler or steam seal heater. The modern production of steam turbines adopts a self sealing type of shaft seal system, and the thermal system only has one shaft seal cooler. Different factories also have different names, which refer to the same equipment. In the early 200MW units, there were shaft seal heaters and shaft seal coolers installed on the thermal system. The shaft seal heaters used high-pressure shaft seal steam as heating steam, which was higher than the pressure of the 8 # low-pressure heater, in order to recover the heat and working fluid of the shaft seal steam. The shaft seal cooler was used to cool the shaft seal extraction steam (or to use the shaft seal extraction steam as heating steam), and the cooler was in a vacuum state during operation. Other units usually only have one shaft seal cooler installed.

The air that enters with the shaft seal steam is led to the expansion pipe of the water jet steam extractor through a connecting pipe, and is extracted by the negative pressure of the latter to ensure the micro vacuum state of the shaft seal heater. In this way, the chambers of each shaft seal also maintain a slight vacuum, and the shaft seal steam does not leak out.

Shaft seal heater (shaft seal cooler, steam seal heater) - output voltage:

Shaft seal heater and shaft seal cooler are devices that recover shaft seal steam and use its heat to heat condensate, reducing energy loss and improving unit heat efficiency. When the steam turbine adopts an internal leakage shaft seal system, a shaft seal heater (shaft seal cooler, steam seal heater) is generally installed to heat condensate or desalinated water, recover shaft seal steam, reduce shaft seal steam and heat loss, and improve the environmental conditions of the workshop.

Working principle of shaft seal heater (shaft seal cooler, steam seal heater):

The shaft seal heater, shaft seal cooler, and steam seal heater are connected by connecting pipes to the expansion pipe of the water jet steam extractor with the air entering the shaft seal steam, and are extracted by the negative pressure of the latter to ensure the micro vacuum state of the shaft seal heater. In this way, the pressure of the chambers connected to each shaft seal and the shaft seal heater decreases, and the shaft seal steam does not leak out. Some also use shaft seal air extractors or exhaust fans to create negative pressure and discharge impurities. The shaft seal air extractor is generally a steam injection air extractor, and its supporting shaft seal heater is divided into two parts. The steam compound enters, the steam is condensed, the air is sucked, and combined with the working steam. After expansion, it is discharged. The steam is condensed, and the air is discharged through the exhaust port.

Technical parameters of shaft seal heater, shaft seal cooler, and steam seal heater:

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Steam -seal cooler

The role of a steam -seal cooler is to make the tram from the steam turbine slightly negative pressure, so that the auto continuously enters the auto seal cooler through the auto pipeline and condenses it into water for the boiler to use it.

Shaft seal cooler

The Shaft seal cooler is used to extract the gas-liquid mixture from the steam seal system of the steam turbine, preventing steam from flowing from the end seal to the turbine room and oil system, thereby polluting the environment and damaging the oil quality. Generally, a Shaft seal heater (Shaft seal cooler) is used to heat condensate and recover Shaft seal steam.

Replacing the tube of the Shaft seal heater

Manufacturer of Shaft seal heaters, also undertaking pipe replacement and renovation of Shaft seal heaters, replacing copper pipes, stainless steel pipes, boiler pipes, etc. According to customer needs, the replacement, repair, installation, and restoration of the relevant Shaft seal heater pipes must be carried out. The original equipment must be sent to our company for pipe bundle replacement.

Steam seal heater tube replacement and renovation

The steam seal heater adopts a horizontal U-shaped surface heat exchanger for pipe replacement and transformation. The pipe material is stainless steel pipe, and in addition to expansion joint, the pipe also needs to be sealed and welded with the pipe plate; HSn-70-1 tin brass is also used and fixed on the tube plate by expanding the tube.

sealing cooler tube replacement

The steam seal cooler generally adopts a horizontal U-shaped surface heat exchanger for pipe replacement, and the pipe material is stainless steel pipe. In addition to expansion joint, the pipe also needs to be sealed and welded with the pipe plate; HSn-70-1 tin brass is also used, which is fixed on the tube plate by expanding the tube bundle to the U-shaped tube end freely.

low pressure heater

The function of a low-pressure heater, abbreviated as a low-pressure heater, is to use the steam that has done some work in the turbine to extract and heat the feedwater inside the heater, thereby improving the circulation rate of the thermal system. The heating surface of low-pressure heaters is generally composed of straight or U-shaped tube bundles made of brass pipes or slotted steel pipes.

High pressure heater

The high-pressure heater, abbreviated as high-pressure heater, consists of two main parts: a shell and a piping system. Steam condensation is installed in the upper part of the shell cavity, and drainage cooling is installed in the lower part. The working principle of a high-pressure heater is to use the extraction steam of a steam turbine to heat the boiler feedwater, thereby increasing the output and thermal cycle rate of the generator unit.