Exhaust heat collecting system

Abstract

In one embodiment, an exhaust heat collecting system of collecting exhaust heat in a fluid treatment system. The fluid treatment system includes a fluid path to convey at least an operating fluid or a cooled fluid among first and second heat source fluids, the operating fluid and the cooled fluid. The fluid treatment system further includes a fluid treatment module including an expansion module, a power generator and a condenser for the operating fluid, or including a heat absorbing module and a heat releasing module for the cooled fluid. The exhaust heat collecting system includes a water path to heat water by using the condenser or the heat releasing module, and a heater to heat the water from the water path by using the first or second heat source fluid or the operating fluid to produce the water to be used as hot water or to produce steam.

1 . An exhaust heat collecting system of collecting exhaust heat in a fluid treatment system comprising:
 a fluid path configured to include at least an operating fluid path or a cooled fluid path among a first heat source fluid path, a second heat source fluid path, the operating fluid path and the cooled fluid path, the first heat source fluid path conveying a first heat source fluid, the second heat source fluid path conveying a second heat source fluid heated by heat of the first heat source fluid, the operating fluid path conveying an operating fluid, the cooled fluid path conveying a cooled fluid, the operating fluid being conveyed through or not through an evaporator that vaporizes the operating fluid by using the first or second heat source fluid, the cooled fluid being conveyed through a cooling module that cools the cooled fluid; and   a fluid treatment module configured to include an expansion module that rotates and drives to expand the operating fluid, a power generator that is connected to a rotational shaft of the expansion module, and a condenser that condenses the operating fluid, or configured to include a heat absorbing module that absorbs heat of the first or second heat source fluid, and a heat releasing module that releases heat received from the cooled fluid and heat absorbed by the heat absorbing module,   the exhaust heat collecting system comprising:   a water path configured to supply water to the condenser or the heat releasing module, heat the water by the condensation in the condenser or by the heat release in the heat releasing module, and convey the water of a first temperature discharged from the condenser or the heat releasing module; and   a heater configured to heat the water from the water path by using the first heat source fluid, the second heat source fluid or the operating fluid to produce the water of a second temperature to be used as hot water or to produce steam.   
     
     
         2 . The exhaust heat collecting system of  claim 1 , wherein the heater heats the water by using the first or second heat source fluid that exists downstream or upstream of the evaporator or the heat absorbing module. 
     
     
         3 . The exhaust heat collecting system of  claim 1 , wherein the first or second heat source fluid path is branched into a first branch flow path provided with the evaporator or the heat absorbing module, and a second branch flow path provided with the heater. 
     
     
         4 . The exhaust heat collecting system of  claim 3 , comprising at least one of a first valve provided in the first branch flow path, and a second valve provided in the second branch flow path. 
     
     
         5 . The exhaust heat collecting system of  claim 1 , wherein the first or second heat source fluid path comprises at least one of a first bypass flow path that bypasses a first flow path provided with the evaporator or the heat absorbing module, and a second bypass flow path that bypasses a second flow path provided with the heater. 
     
     
         6 . The exhaust heat collecting system of  claim 1 , wherein the fluid treatment system further comprises a heat source fluid heater configured to heat the second heat source fluid by the heat of the first heat source fluid, the heater heating the water by using the first heat source fluid that exists downstream or upstream of the heat source fluid heater. 
     
     
         7 . The exhaust heat collecting system of  claim 1 , comprising, as the heater, a first heater configured to heat the water by the heat of the first heat source fluid, and a second heater that configured to heat the water by the heat of the second heat source fluid. 
     
     
         8 . The exhaust heat collecting system of  claim 7 , wherein one of the first and second heaters is heated by the other of the first and second heaters, and heats the water flowing out from the other of the first and second heaters. 
     
     
         9 . The exhaust heat collecting system of  claim 1 , wherein the operating fluid path is branched into a first fluid path provided with the expansion module and the condenser, and a second fluid path provided with the heater. 
     
     
         10 . The exhaust heat collecting system of  claim 9 , wherein the first and second fluid paths merge into a third fluid path that is provided with the evaporator, and the third fluid path is branched into the first and second fluid paths. 
     
     
         11 . The exhaust heat collecting system of  claim 1 , wherein the operating fluid path comprises a fourth fluid path that conveys the operating fluid discharged from an exhaust port of the expansion module and is provided with the condenser, and a fifth fluid path that conveys the operating fluid extracted from an extraction port of the expansion module and is provided with the heater. 
     
     
         12 . The exhaust heat collecting system of  claim 11 , wherein the fourth and fifth fluid paths merge into a sixth fluid path that is provided with the evaporator, and the sixth fluid path conveys the operating fluid to the expansion module. 
     
     
         13 . The exhaust heat collecting system of  claim 9 , comprising at least one of a valve provided in the first or fourth fluid path and a valve provided in the second or fifth fluid path. 
     
     
         14 . The exhaust heat collecting system of  claim 9 , comprising, as the heater, a third heater provided in the second or fifth fluid path, and a fourth heater provided downstream of the third heater in the second or fifth fluid path. 
     
     
         15 . The exhaust heat collecting system of  claim 14 , wherein the water path is branched into a first water path provided with the condenser and a second water path provided with the fourth heater, and the first and second water paths merge into a third water path that is provided with the third heater. 
     
     
         16 . The exhaust heat collecting system of  claim 14 , comprising at least one of a valve provided in the first water path and a valve provided in the second water path. 
     
     
         17 . The exhaust heat collecting system of  claim 1 , wherein the heater heats the water by using the operating fluid that exists upstream of the expansion module. 
     
     
         18 . The exhaust heat collecting system of  claim 1 , wherein the water path circulates the water between the heater and the condenser or the heat releasing module. 
     
     
         19 . The exhaust heat collecting system of  claim 1 , wherein a maximum temperature of the first heat source fluid, the second heat source fluid or the operating fluid is equal to or less than 200° C. 
     
     
         20 . The exhaust heat collecting system of  claim 1 , wherein the first heat source fluid is hot spring water or a fluid that is heated in a heat source fluid heater that obtains heat from a heat source of non-fossil fuel.