On the morning of the 5th, the Shenzhen traffic police issued the first "extra-limit" ticket. The license for the Shanghai CXV295 was driven by the morning peak on the 2nd day of February 2nd, 3rd and 4th in the main road of Shenzhen, facing 300 yuan. 3 points of punishment. On the same day, the Shenzhen traffic police issued a total of 262 foreign-licensed vehicles that violated the Shenzhen “exemption†order.
In order to achieve optimum process operations, it is essential to use the right type of process equipment in any given process. Heat exchangers, commonly used to transfer energy from one fluid to another, are no exception. The selection of the proper type of heat exchangers is of critical importance. Selecting the wrong type can lead to sub-optimum plant performance, operability issues and equipment failure.
The following criteria can help in selecting the type of heat exchanger best suited for a given process:
· Application (i.e. sensible vapor or liquid, condensing or boiling)
· Operating pressures & temperatures (including startup, shutdown, normal & process upset conditions)
· Fouling characteristics of the fluids (i.e. tendency to foul due to temperature, suspended solids ...)
· Available utilities (cooling tower water, once through cooling water, chilled water, steam, hot oil...)
· Temperature driving force (i.e. temperature of approach or cross and available LMTD)
· Plot plan & layout constraints
· Accessibility for cleaning and maintenance
· Considerations for future expansions
· Mechanical considerations such as: 1) material of construction; 2) thermal stresses (during startup, shutdown; process upset and clean out conditions); 3) impingemen protection
Heat Exchangers Types
Plate-fin (Plate-bar) heat exchanger
Tube-fin intercooler, radiator
Stacked layer oil cooler
Fin-tube heat exchanger ( ambient vaporizer )
Coil-tube heat exchanger ( Water Bath Vaporizer )
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On December 29, 2014, when Shenzhen announced the “restriction order†for the car, the Shenzhen Traffic Police issued a notice to restrict the passage of cars in the field. According to the notice, the time limit is four hours for the morning and evening peaks of 7:00-9:00 and 17:30-19:30 on weekdays. The restricted roads are four administrative offices in Futian District, Luohu District, Nanshan District and Yantian District of Shenzhen. All roads in the area (except for designated routes to and from Shenzhen ports). The offender is fined 300 yuan and scores 3 points.
The “extra-limit†measures were implemented on January 1, 2015, and a one-month buffer adaptation period was set up, which was officially implemented from the first working day in February.
The Shenzhen traffic police adopted a combination of on-the-spot police investigation and traffic technology monitoring equipment to conduct law enforcement. Since February 1, the system has monitored that non-Shenzhen number passenger cars have travel records in Shenzhen restricted roads and restricted time periods. No penalty for two times (only once a day), from the third time.