A utilization method of
polymerization esterification residual heat and a device are disclosed. The method is that
tower top waste steam of a knockout
tower on the upper portion of an
esterification reaction kettle is led out and supplied to at least one
lithium brominate refrigerator as heat source, a collecting tank is arranged on the outlet of
condensed water of the refrigerator, water is transmitted to a waste water collecting tank with a pump, a part of water is used as
tower top
reflux water, and the rest overflows into a stripping tower to be reclaimed. A pressure regulating valve is added on a
pipe which is used to lead out waste steam from the top tower of the knockout tower, which can increase the
steam pressure using as the heat source of the
lithium brominate refrigerator. The device comprises at least one
lithium brominate refrigerator, the top tower portion of the knockout tower on the upper portion of the
esterification reaction kettle is connected on a condenser of the lithium brominate refrigerator through a steam
pipe, a pressure regulating valve which can increase
steam pressure in the steam
pipe is connected in series on the steam pipe, and a steam
branch pipe is further connected in parallel on the steam pipe, at least one air
heat exchanger is connected on the steam
branch pipe. The device has the characteristics of simple technology, safe, reliable and convenient usage and significant energy-saving effect, reduces the energy waste, increases the recycling usage of energy, and can really play the purpose of energy-saving and emission reduction.