Heat recovery system

Abstract

A heat recovery system includes a plurality of heat source portions; a heat exchanger connected to the heat source portions via a primary flow path portion through which a first fluid flows, and configured to perform heat exchange between the first fluid and a second fluid; a valve mechanism configured to select a flow path that connects the heat exchanger and the heat source portions; and a power generation unit connected to the heat exchanger via a secondary flow path portion through which the second fluid flows, and configured to generate electric power using the second fluid. Timing of a temperature rise of the first fluid in one heat source portion is different from that in another heat source portion. The valve mechanism operates in accordance with the timing of the temperature rise of the first fluid in each of the heat source portions.

What is claimed is: 
     
         1 . A heat recovery system comprising:
 a plurality of heat source portions configured to raise a temperature of a first fluid using heat obtained by treating an object;   a heat exchanger connected to the plurality of heat source portions via a primary flow path portion through which the first fluid flows, and configured to perform heat exchange between the first fluid and a second fluid;   a valve mechanism provided in the primary flow path portion and configured to select a flow path that connects the heat exchanger and the heat source portions; and   a power generation unit connected to the heat exchanger via a secondary flow path portion through which the second fluid flows, and configured to generate electric power using the second fluid as an input, wherein   timing of a temperature rise of the first fluid in one of the heat source portions is different from timing of a temperature rise of the first fluid in another of the heat source portions, and the valve mechanism operates in accordance with the timing of the temperature rise of the first fluid in each of the plurality of heat source portions.   
     
     
         2 . The heat recovery system according to  claim 1 , wherein:
 the primary flow path portion includes a main flow path that connects the heat source portions and the heat exchanger, and a coupling flow path that connects the heat source portions to each other to enable movement of the first fluid between the heat source portions; and   the valve mechanism includes a valve configured to switch the flow path such that, in a case where the temperature of the first fluid in the one heat source portion is raised, the first fluid flows to the other heat source portion through the coupling flow path and the first fluid flows to the heat exchanger by way of the other heat source portion.   
     
     
         3 . The heat recovery system according to  claim 1 , wherein the power generation unit is a binary power generation unit. 
     
     
         4 . A heat recovery system comprising:
 a plurality of heat source portions configured to raise a temperature of a first fluid using heat obtained by treating an object;   a heat exchanger connected to the plurality of heat source portions via a primary flow path portion through which the first fluid flows, and configured to perform heat exchange between the first fluid and a second fluid;   a valve mechanism provided in the primary flow path portion and configured to select a flow path that connects the heat exchanger and the heat source portions; and   a power generation unit connected to the heat exchanger via a secondary flow path portion through which the second fluid flows, and configured to generate electric power using the second fluid as an input, wherein:   the primary flow path portion includes a main flow path that connects the heat source portions and the heat exchanger, and a coupling flow path that connects the heat source portions to each other to enable movement of the first fluid between the heat source portions; and   the valve mechanism includes a valve configured to switch the flow path such that, in a case where the temperature of the first fluid in one of the heat source portions is raised, the first fluid flows to another of the heat source portions through the coupling flow path and the first fluid flows to the heat exchanger by way of the other heat source portion.   
     
     
         5 . The heat recovery system according to  claim 4 , wherein the power generation unit is a binary power generation unit. 
     
     
         6 . A heat recovery system comprising:
 a primary-side flow path through which a first fluid flows from a heat source;   a heat exchanger configured to perform heat exchange between the first fluid, which flows through the primary-side flow path, and a second fluid;   a secondary-side flow path through which the second fluid flows;   a power generation device configured to generate electric power using the second fluid in the secondary-side flow path; and   a condenser configured to cool and condense the second fluid that has passed through the power generation device, wherein:   the primary-side flow path includes a multi-walled pipe that includes an inner flow path portion through which the first fluid passes and an outer flow path portion provided around the inner flow path portion; and   the outer flow path portion is supplied with heated air obtained through heat output from a waste heat output portion that is at least one of the heat source, another heat source, and the condenser.   
     
     
         7 . The heat recovery system according to  claim 6 , wherein:
 the primary-side flow path includes a first pipe that allows the first fluid to flow from the heat source to the heat exchanger;   the first pipe includes the multi-walled pipe; and   the heat recovery system includes a connection pipe through which the heated air is supplied from the waste heat output portion to the outer flow path portion of the multi-walled pipe.   
     
     
         8 . The heat recovery system according to  claim 6 , wherein:
 the multi-walled pipe includes a main pipe and a sub pipe;   a heat insulating material is provided at an outer periphery of the main pipe, and an inside of the main pipe serves as the inner flow path portion; and   the sub pipe is provided around an outer peripheral side of the main pipe such that a flow path with an annular cross section that serves as the outer flow path portion is configured.   
     
     
         9 . The heat recovery system according to  claim 6 , wherein:
 the waste heat output portion is the condenser that cools and condenses the second fluid; and   the second fluid is air-cooled by a fan.   
     
     
         10 . The heat recovery system according to  claim 6 , further comprising:
 a connection pipe that connects the waste heat output portion and the outer flow path portion of the multi-walled pipe, the connection pipe being configured to supply the heated air from the waste heat output portion;   a first valve configured to allow and block an inflow of the heated air from the connection pipe to the outer flow path portion;   a discharge pipe connected to the outer flow path portion to discharge the heated air; and   a second valve configured to allow and block an outflow of the heated air from the outer flow path portion to the discharge pipe.   
     
     
         11 . The heat recovery system according to  claim 6 , wherein:
 the multi-walled pipe includes a main pipe, a sub pipe, and an outer pipe;   a heat insulating material is provided at an outer periphery of the main pipe, and an inside of the main pipe serves as the inner flow path portion;   the sub pipe is provided around an outer peripheral side of the main pipe such that a flow path with an annular cross section that serves as the outer flow path portion is provided; and   the outer pipe is provided around an outer peripheral side of the sub pipe such that a vacuum space with an annular cross section is configured.