The application provides a paper pulp
production line and a
heat energy recovery system thereof; the
heat energy recovery system comprises a steam exhaust generating device, a
heat exchanger and a refrigerator; the
heat exchanger is communicated with a steam exhaust output pipeline of the steam exhaust generating device; the
heat exchanger is used for transferring the heat of the steam exhaust to hot water, and conveying the hot water to the refrigerator; the refrigerator uses the heat in the hot water to refrigerate, and conveys the hot water after heat exchange back to the heat exchanger to be heated again, and realizes the heat utilization of the steam exhaust generated in the steam exhaust generating device through reciprocating circulation. The
heat energy recovery system provided by the application has the advantages of saving
energy consumption (saving original
refrigeration energy consumption) to realize the purpose of reducing operation cost, realizing closed cooling of
waste heat steam exhaust, reducing heat emission, reducing carbon emission, being environment-friendly, not producing new
pollution emission, conforming to the national energy saving and
environmental protection policy, obvious economic benefit and social benefit, and good application prospect.