Exhaust Heat Recovery System

Abstract

Efficient recovery of thermal energy. An exhaust heat recovery system comprising: a plurality of gas compressors; a exhaust heat recovery equipment; and a controller, wherein further comprising a exhaust heat recovery path connecting the plurality of gas compressors and the exhaust heat recovery equipment, and the plurality of gas compressors can select whether or not to use the exhaust heat recovery path based on instructions from the controller, the controller compares the set required water temperature with the supply water temperature, which is the temperature of the water supplied from the exhaust heat recovery equipment to the outside, and at least one of the plurality of gas compressors is instructed to use the exhaust heat recovery path when the supply water temperature is lower than the required water temperature.

What is claimed is: 
     
         1 . An exhaust heat recovery system comprising:
 a plurality of gas compressors;   an exhaust heat recovery equipment;   and a controller,   wherein further comprising a exhaust heat recovery path connecting the plurality of gas compressors and the exhaust heat recovery equipment, and the plurality of gas compressors can select whether or not to use the exhaust heat recovery path based on instructions from the controller,   the controller compares the set required water temperature with the supply water temperature, which is the temperature of the water supplied from the exhaust heat recovery equipment to the outside, and at least one of the plurality of gas compressors is instructed to use the exhaust heat recovery path when the supply water temperature is lower than the required water temperature.   
     
     
         2 . The exhaust heat recovery system according to  claim 1 , wherein the controller instructs one of the gas compressors using the exhaust heat recovery path to stop using the exhaust heat recovery path in case the supply water temperature is higher than the required water temperature. 
     
     
         3 . The exhaust heat recovery system according to  claim 1 , wherein at the time the controller instructs one of the gas compressors not using the exhaust heat recovery path to use the exhaust heat recovery path, in case a constant speed machine is included in a gas compressor that does not use the exhaust heat recovery path, the controller instructs to use of the exhaust heat recovery path with priority given to the constant speed machine. 
     
     
         4 . The exhaust heat recovery system according to  claim 1 , wherein at the time the controller instructs one of the gas compressors not using the exhaust heat recovery path to use the exhaust heat recovery path, in case a constant speed machine is not included in a gas compressor that does not use the exhaust heat recovery path, and a variable speed machine in full-speed operation is included, the controller instructs to use of the exhaust heat recovery path with priority given to the variable speed machine in full-speed operation. 
     
     
         5 . The exhaust heat recovery system according to  claim 1 , wherein at the time the controller instructs one of the gas compressors using the exhaust heat recovery path not to use the exhaust heat recovery path, in case a variable speed machine during frequency control is included in a gas compressor using the exhaust heat recovery path, the controller instructs to stop using the exhaust heat recovery path with priority given to the variable speed machine during frequency control. 
     
     
         6 . The exhaust heat recovery system according to  claim 1 , wherein at the time the controller instructs one of the gas compressors using the exhaust heat recovery path not to use the exhaust heat recovery path, in case a variable speed machine during frequency control is not included in a gas compressor using the exhaust heat recovery path, and a variable speed machine in full-speed operation is included, the controller instructs to stop using the exhaust heat recovery path with priority given to the variable speed machine in full-speed operation. 
     
     
         7 . The exhaust heat recovery system according to  claim 1 , wherein the controller instructs the use of a exhaust heat recovery path with priority given to a gas compressor having a large amount of recoverable heat amount. 
     
     
         8 . A heat energy recovery equipment comprising:
 a exhaust heat recovery equipment and a controller, wherein the controller instructs a plurality of gas compressors whether or not to use a exhaust heat recovery path between the gas compressor and the exhaust heat recovery equipment,   wherein further comprising a exhaust heat recovery path connecting the plurality of gas compressors and the exhaust heat recovery equipment, and the plurality of gas compressors can select whether or not to use the exhaust heat recovery path based on instructions from the controller,   the controller compares the set required water temperature with the supply water temperature, which is the temperature of the water supplied from the exhaust heat recovery equipment to the outside, and at least one of the plurality of gas compressors is instructed to use the exhaust heat recovery path when the supply water temperature is lower than the required water temperature.   
     
     
         9 . The heat energy recovery equipment according to  claim 8 , wherein the controller instructs one of the gas compressors using the exhaust heat recovery path to stop using the exhaust heat recovery path in case the supply water temperature is higher than the required water temperature. 
     
     
         10 . The heat energy recovery equipment according to  claim 8 , wherein at the time the controller instructs one of the gas compressors not using the exhaust heat recovery path to use the exhaust heat recovery path, in case a constant speed machine is included in a gas compressor that does not use the exhaust heat recovery path, the controller instructs to use of the exhaust heat recovery path with priority given to the constant speed machine. 
     
     
         11 . The heat energy recovery equipment according to  claim 8 , wherein at the time the controller instructs one of the gas compressors not using the exhaust heat recovery path to use the exhaust heat recovery path, in case a constant speed machine is not included in a gas compressor that does not use the exhaust heat recovery path, and a variable speed machine in full-speed operation is included, the controller instructs to use of the exhaust heat recovery path with priority given to the variable speed machine in full-speed operation. 
     
     
         12 . The heat energy recovery equipment according to  claim 8 , wherein at the time the controller instructs one of the gas compressors using the exhaust heat recovery path not to use the exhaust heat recovery path, in case a variable speed machine during frequency control is included in a gas compressor using the exhaust heat recovery path, the controller instructs to stop using the exhaust heat recovery path with priority given to the variable speed machine during frequency control. 
     
     
         13 . The heat energy recovery equipment according to  claim 8 , wherein at the time the controller instructs one of the gas compressors using the exhaust heat recovery path not to use the exhaust heat recovery path, in case a variable speed machine during frequency control is not included in a gas compressor using the exhaust heat recovery path, and a variable speed machine in full-speed operation is included, the controller instructs to stop using the exhaust heat recovery path with priority given to the variable speed machine in full-speed operation. 
     
     
         14 . The heat energy recovery equipment according to  claim 8 , wherein the controller instructs the use of a exhaust heat recovery path with priority given to a gas compressor having a large amount of recoverable heat amount.