Heat energy recovery low-temperature normal-pressure evaporator

Abstract

The invention discloses a heat energy recovery low-temperature normal-pressure evaporator, which relates to the technical field of wastewater treatment in environmental protection engineering, and comprises a feed liquid circulation concentration system, an air circulation system and a condensation recovery system, wherein the output end of a raw material box in the feed liquid circulation concentration system is connected with the input end of a solution collection box through a liquid inlet pump; wherein the solution collecting box is in circulating connection with the evaporation system sequentially through the feed liquid circulating pump and the graphite heat exchanger, the output end of the solution collecting box is connected with the input end of the concentration barrel through the discharging pump. and the heat preservation water tank is in circulating connection with the graphite heat exchanger through the first hot water circulating pump; the heat preservation water tank isin circulating connection with the graphite heat exchanger through the first hot water circulating pump and is in circulating connection with the shell-and-tube heat exchanger through the second hotwater circulating pump. In the invention, air with moisture content is in contact with feed liquid in the evaporation chamber to be heated and absorb moisture and then is condensed into water in the condensation chamber, the condensation heat is used as a feed liquid heating heat source through the heat pump, an external heat source is not needed in the evaporation process, and energy consumptionis effectively reduced.

Description

technical field [0001] The invention relates to the technical field of waste water treatment in environmental protection engineering, in particular to a heat recovery low-temperature atmospheric pressure evaporator. Background technique [0002] The existing low-temperature and atmospheric-pressure evaporation devices mostly use raw steam as the heat source, and mainly include raw material tanks, steam generators, preheaters, evaporation and concentration main bodies, and condensation recovery systems. The waste water needs to be pumped into the preheater from the raw material tank to be heated to the evaporation temperature, and then enter the evaporation concentration main body for evaporation. The generated steam is cooled by the condenser and then the liquid is recovered. The concentrated liquid is collected for outsourcing treatment or reuse. During this process, new waste water is constantly needed. The heat source heats the feed liquid, resulting in a waste of resourc...

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Problems solved by technology

[0003] According to the deficiencies of the prior art above, the technical problem to be solved by the present invention is to propose a heat energy recovery low-temperature atmospheric pressure evaporator, which solves the problem that the existing evaporator needs to continuously replenish the heat source to heat the feed liquid when the evaporator is in use. The air with moderate moisture content contacts with the feed liquid in the evaporation chamber to heat and absorb moisture, and condenses into water in the condensation chamber. The heat of condensation is used as the heat source for heating the feed liquid by the heat pump, and the excess heat of the system is used to heat the feed liquid. The evaporation process does not require External heat source, effectively reducing energy consumption

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