First commissioning of the first set of steam turbines for coal-to-gas natural gas in China

Xinhuanet Inner Mongolia Channel September 21st The first set of coal-fired natural gas separation plant steam turbines in China was successfully commissioned in Datang International Kashkent Coal-to-Gas Co., Ltd., and achieved another milestone in project construction. The air separation plant of the Kashkentengqi coal-to-gas project in Chifeng City, Inner Mongolia Autonomous Region is the largest oxygen-making nitrogen-making device in the construction of coal-to-gas projects. It mainly supplies oxygen to the gasification plant and provides nitrogen and instrument air for the whole plant. The oxygen production process is to use air compressor to compress air into a liquid state, and then use the boiling point of rare gases such as oxygen, nitrogen and argon in the air to achieve oxygen production by fractionation process at different temperatures. The main power system of the steam turbine compressor is the starting station of the whole air separation plant process system. The completion of the steam turbine is the key to the air separation unit. According to Datang International Kashkeng Coal-to-Gas Co., Ltd., the steam turbine unit test was successful, which proves that the operating environment and process parameters are in full compliance with the parameter setting requirements for the normal operation of the air separation unit. The conditions for production have taken a big step.

Fixed Tube Heat Exchanger

Fixed tube heat exchanger consists of tube bundle, tube plate, shell, head, folded plate, etc. Tube bundle ends fixed in the tube plate, the tube can be expanded (the inner hole of the tube with mechanical expansion, so that the tube wall from the inward to outward extrusion and fixed in the tube plate) or welded to the tube plate. The tube bundle is placed within the tube shell, with headers and flanges fixed at both ends. In this way, one fluid flows from the inside of the tube and the other from the outside. The space between the two heads and the tube plate is used to distribute or collect the fluids inside the tube. The two fluids do not mix with each other, but only exchange heat through the tube wall.



Advantages: simple and compact structure, high pressure resistance, low cost and easy to clean the tube side.


Disadvantages: Risk of blockage when the tube is damaged or needs to be replaced.



When the difference between the wall temperature of the tube bundle and the shell or the coefficient of linear expansion of the material is large, a large thermal stress will be generated in the shell and the tube bundle. A flexible compensation ring (also called expansion joint) should be installed on the shell to reduce the thermal stress.

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