Apparatus for recovering re-evaporated steam and condensate

Abstract

The present invention relates to an apparatus for recovering re-evaporated steam and condensate, and in particular, to an apparatus for mixing the steam re-evaporated from condensate that is discharged from a heating unit for heating an object to be treated, with high-temperature steam supplied from a boiler, and for resupplying the mixed steam to the heating unit. To this end, the apparatus comprises: a steam recovery unit for recovering the condensate discharged from a heating unit for heating an object to be treated, and the steam re-evaporated from the condensate, and then supplying the recovered re-evaporated steam to a steam-pressurizing unit and the recovered condensate to a boiler; and the steam-pressurizing unit for mixing the re-evaporated steam supplied from the steam recovery unit, with high-temperature steam supplied from the boiler and then supplying the mixed steam to the heating unit. Therefore, with a closed circuit, the apparatus can recover the whole quantity of the re-evaporated steam and condensate for use, prevent the release of steam into the air and utilize a latent heat contained in the condensate, thereby improving the efficiency of energy consumption.

1 . An apparatus for recovering re-evaporated steam and condensate for a boiler, the apparatus comprising:
 a steam recovery unit for recovering condensate discharged from a heating unit for heating an object to be treated, and the steam re-evaporated from the condensate, and then supplying the recovered re-evaporated steam to a steam-pressurizing unit and the recovered condensate to the boiler; and   the steam-pressurizing unit for mixing the re-evaporated steam supplied from the steam recovery unit, with high-temperature steam supplied from the boiler and then supplying the mixed steam to the heating unit,   wherein the steam-pressurizing unit comprises: a stream re-pressurization control valve for mixing the high-temperature steam supplied from the boiler with the re-evaporated steam supplied from the steam recovery unit, and supplying the mixed steam to the heating unit; a pressure sensor; disposed between stream re-pressurization control valve and the heating unit for detecting a pressure of the steam supplied to the heating unit; and a pressure control unit for outputting an operation control signal to the stream re-pressurization control valve based on the pressure detected from the pressure sensor and controlling the operation of the stream re-pressurization control valve.   
     
     
         2 . The apparatus according to  claim 1 , wherein the steam recovery unit comprises: an evaporation vessel connected with the heating unit for allowing the condensate produced through the heat exchange in the heating unit to be introduced thereinto and for recovering the steam re-evaporated from the condensate introduced into the evaporation vessel; and a feed water pump for allowing the condensate introduced into the evaporation vessel to be forcibly supplied to the boiler. 
     
     
         3 . The apparatus according to  claim 2 , wherein the steam recovery unit comprises: a water level sensor installed at one side of the evaporation vessel  210  for detecting the water level of the condensate introduced into the evaporation vessel; and a water level control unit for analyzing the water level of the condensate detected from the water level sensor and outputting an operation control signal to the feed water pump based on a result of the analysis to control the operation of the feed water pump. 
     
     
         4 . The apparatus according to  claim 3 , wherein the steam recovery unit further comprises an overflow valve installed at one side of the evaporation vessel for preventing an overflow of the condensate due to the excessive introduction of the condensate into the evaporation vessel.