The 100-day rectification campaign for the emission of motor vehicle pollutants from transport enterprises in Xi'an has been successfully completed. Through the "into the university", "into the construction site" and "into the enterprise", the operation of 1005 school buses, muck trucks and coaches was examined. Vehicles with relatively concentrated time and a wide range of social impacts were investigated and seized 21 vehicles exceeding the standard.
In order to alleviate the smog problem caused by motor vehicle exhaust pollution, the municipal environmental protection, public security, transportation and other departments set up a joint inspection team, from October 15, 2014 to January 15, 2015, to transport vehicles in the city. The pollutant discharge will be carried out for 100 days.
After the activity was started, the Municipal Environmental Protection Bureau, the Municipal Public Security Bureau, and the Municipal Transportation Bureau conducted a network-based investigation of the 36 large-scale vehicle transportation enterprises in the city according to the task division and work plan, and registered 2028 transportation vehicles respectively. Summary categorization. Since the launch of the special action, the Joint Inspection Unit has dispatched more than 300 law enforcement personnel. It has inspected 1,005 school buses, muck trucks, and coaches, which have relatively concentrated operation time and a wide range of social impacts. A total of 21 vehicles with excessive emissions have been investigated. The vehicles that have exceeded the standard for discharge are punished according to the “Regulations on the Prevention and Control of Motor Vehicle Exhaust Pollution in Xi’an Cityâ€, and they are required to be governed and maintained within a time limit, and the licenses for overdue non-governance vehicles are restricted, suspended, and rectified.
Through the implementation of the 100-day rectification action, the survey found that the operating vehicles of various transport enterprises are mostly vehicles with a short service life, and the vehicle conditions are relatively good. This shows that in recent years, by increasing the supervision and supervision of motor vehicle exhaust pollution, it has prompted the transport enterprises to take the initiative. Eliminate the old vehicles. The outstanding problems of the previous transportation enterprises' vehicles exceeding the standard discharge have been effectively solved, and the emission rate has reached a significant increase, and the qualified rate of exhaust emission testing has reached 98%.
A shell and tube heat exchanger is a type of heat exchanger that is commonly used for heating, cooling and condensing applications. lt consists of a shell with an internal bundle of tubes,which allows the hot and cold fluids to pass through the walls of the exchanger and exchange their energy. Shell and tube exchangers are classified in several ways, including design, operational construct, and construction materials. Mainly Fixed Tube Heat Exchanger, Floating Head Heat Exchanger, U-tube Heat Exchanger, and double tube heat exchanger.
The working principle of a shell and tube heat exchanger is relatively simple. The system is designed with two separate flows on either side of the heat exchanger. The primary flow of the hot fluid passes through the tubes, while the secondary flow of the cold fluid passes through the spaces between the tubes. Heat is then transferred from the hot side to the cold side via conduction, leading to an exchange of temperatures.
Shell and tube heat exchangers are normally used in process plants and used in a wide range of applications. A case in point is the cooling of condensates in refineries and nuclear power plants. In this application, condensate is heated using an external source and passed through the tube section of the heat exchanger. This condensate is then cooled and condensed as it passes through the shell side, where the heat is transferred to a cooling medium such as water, steam or oil.
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