In order to ensure the safety of passenger trains in the past few days due to the impact of typhoon "Yanyan", from August 1st, Hainan's Donghuan High Speed ​​Rail 21 EMU has started its shutdown, and resumed due to typhoon warning conditions. If you go to Hainan, pay attention to time. Affected by Typhoon Feiyan, starting from 10 a.m. on August 1st, emergency response for Typhoon-related typhoon at relevant railway stations in Sanya, Hainan, preparation of plans for flood prevention and prevention, and suspension of sale for Sanya Station and Haikou Station from August 1-3 Some long-distance passenger train tickets originating from the airport will stop selling the return ticket of the corresponding train.
During the typhoon, the Guangdong Railway Department will take safety measures such as speed limits and outage trains according to the actual conditions of wind speed and rainfall. The railway department will release relevant information in a timely manner in case of possible large-scale trains being late or out of service. The railway department reminds passengers to pay attention to the announcements of relevant stations. For information on train adjustment services, please visit the website of 12306 Railway Customer Service Center or call 12306 customer to inquire.
The specific suspension trips are as follows: On August 2, Sanya Station opened D7302, D7310, D7312, D7314, D7306, D7304, D7308, D7346, D7348, D7352 stops.
On August 2, Haikou East Station opened D7307, D7301, D7303, 0D7380, D7309, D7313, D7345, and D7351 stops.
On August 2, Haikou Station opened D7305, D7311, and D7347 stops.
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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Guangdong Jiema Energy Saving Technology Co.,Ltd , https://www.heatexchangerjiema.com