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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;
They are, instead, gas-to-air heat exchangers that are typically made of stamped steel sheet metal. The combustion products pass on one side of these heat exchangers, and air to heat on the other. A cracked heat exchanger is therefore a dangerous situation that requires immediate attention because combustion products may enter living space.
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]
Then, heat output from combustion is captured by a metal heating element called a heat exchanger inside the furnace," explains Greenwood. "At the same time, a powerful fan blows cool indoor air ...
High efficiency condensing gas furnaces typically achieve between 90% and 98% AFUE. [3] 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 ...
High-efficiency condensing furnaces condense the water vapor (one of the by-products of gas combustion) and extract the latent heat to pre-heat the incoming furnace airflow, using a second heat exchanger. [2] This increases the efficiency (energy delivered into the building vs. heating value of gas purchased) to over 90%.
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