Southern Metropolitan Guangzhou Baiyun Police reported to the media yesterday: At 15:30 on the 8th, Baiyun District Public Security Branch police officers led police officers to conduct day-to-day public security inspections within the jurisdiction of Junyi Street. They discovered three suspicious men and conducted investigations. Suddenly they were violently attacked by the three men and a civilian policeman was stabbed in the neck. The on-site police opened fire in response to the attack, shot and killed each suspect, and arrested another suspect.
At present, injured policemen are sent to hospital for treatment and are no longer in danger. The case is still under investigation.
Floated type shell&tube heat exchanger is mostly used for large temperature fluctuations and temperature differences, compared with Fixed Tube Heat Exchanger, its structure is more complex and more expensive.
One end of the tube is fixed on an immobile Tube Sheet, which is clamped between the shell Flange and the tube flange, and is connected by bolts; the other end of the tube is fixed on a floating head tube sheet, which is clamped between the floating cover and the hook ring connected by studs, forming a floating head that can move freely in the shell.
If the tube bundle and the shell are heated and elongated, they do not affect each other, so there is no temperature difference stress. The floating part is a detachable connection consisting of the floating tube sheet, hook ring and floating cover. It is easier to take the tube bundle out, and the tube can be cleaned both inside and outside and is easy access.
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