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In modern cracking furnaces, the residence time is reduced to milliseconds to improve yield, resulting in gas velocities up to the speed of sound. After the cracking temperature has been reached, the gas is quickly quenched to stop the reaction in a transfer line heat exchanger or inside a quenching header using quench oil. [citation needed] [8]
Thermal shock resistance measures can be used for material selection in applications subject to rapid temperature changes. The maximum temperature jump, , sustainable by a material can be defined for strength-controlled models by: [4] [3] = where is the failure stress (which can be yield or fracture stress), is the coefficient of thermal expansion, is the Young's modulus, and is a constant ...
steam cracking furnaces: primary and secondary heat recovery with quench; a dilution steam recycle system between the furnaces and the quench system; primary compression of the cracked gas (3 stages of compression); hydrogen sulfide and carbon dioxide removal (acid gas removal); secondary compression (1 or 2 stages); drying of the cracked gas;
A condensing gas furnace includes a sealed combustion area, combustion draft inducer and a secondary heat exchanger. The primary gain in efficiency for a condensing gas furnace, as compared to a mid-efficiency forced-air or forced-draft furnace, is the capture of latent heat from the exhaust gases in the secondary heat exchanger.
Tubular heat exchanger Partial view into inlet plenum of shell and tube heat exchanger of a refrigerant based chiller for providing air-conditioning to a building. A heat exchanger is a system used to transfer heat between a source and a working fluid. Heat exchangers are used in both cooling and heating processes. [1]
After the cracking temperature has been reached, the gas is quickly quenched in the heat exchanger to stop the reaction. The plant produces 40,000 tons (36,000 tonnes ) of propylene and 650,000 tons (590,000 tonnes) of ethylene every year for use in the plastics industry .
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