Quench heat exchanger, seeking expert help

Quench water is used to condense steam and cool it to the desired temperature; this is the standard technical term for it.

A pyrolysis unit? Does a refrigerator refer to a “cold box”?

Mm-hmm, yes. . It’s a pyrolysis unit; it is indeed a cold box. I was wrong. Solve

What is the purpose of a quench heat exchanger? . What is the difference from ordinary heat exchangers? I’d like to ask the experts: ’( What are quench oil, quench water, and refrigerators? I know a little about them; it’s more or less like this. The rapid cooling heat exchanger, which we refer to as a waste heat boiler, facilitates heat exchange between the 800-degree pyrolysis gas and boiler water, generating super-high pressure steam of around 100 KG to drive the compressor turbine. Quenching is intended to suppress the secondary reactions of pyrolysis (an emergency stop), requiring an extremely short residence time of 20–50 ms; the pyrolysis gases exiting the reactor are at around 400 degrees Celsius. Waste heat boilers are heat exchangers that operate under high temperature and pressure; they require a high level of precision in their construction, and basically, the equipment used is imported (from three manufacturers). Additionally, coking is also a characteristic of it, and it requires regular coking removal. Quench oil 1. The 400-degree pyrolysis gas enters the quench fitting, where it is cooled by spraying with quench oil, with the outlet temperature kept below 250 degrees ； It enters the quench oil tower, where the top of the tower is also cooled by quench oil spraying, and the heavy fuel oil is separated at the bottom of the tower. In this way, the quench oil absorbs a large amount of heat, which is then used as a heat source to generate dilute steam for the cracking furnace; after cooling, the quench oil returns to the two aforementioned \"sprayers\", thus repeating this cycle (for heat transfer). The cracked gas, at around 100 degrees Celsius, exits the quench oil tower and goes to the quench water tower. At the top of this tower, the gas is cooled by spraying quench water, bringing its temperature down to 40 degrees Celsius before it can enter the compressor. At the bottom of the tower, an oil-water separator is used to separate the cracked gasoline from the quench water; the quench water is then cooled again and sent back to the top of the tower for further spraying. The quench water simultaneously recovered H2O from the pyrolysis gas (from the dilution steam from pyrolysis). Quench water also serves as the heat source for the reboiler in the C3 system, while a portion of it, after stripping, is used as feedstock for dilution steam. Refrigerator 1. The separation of C3/C2/C1/H2 is carried out at low temperatures, requiring cryogenic conditions of up to –196 degrees. 2. The pyrolysis gas also needs to be cooled before it can enter the cold separation system. Ethylene/propane compressors are, in fact, the compressors used in \"refrigerators\"; liquid ethylene/propane is cooled by absorbing heat through flash evaporation, and there are also those that use methane hydrogen for cooling via expansion. @jiaguoyun

Is it the quad-exchanger of the ethylene plant?