Gas combustor

Abstract

A gas includes a main pipe, a bypass pipe, a gas sensor and a cooler. The main pipe, as an exhaust pipe, discharges exhaust gas generated at combustion of gas fuel. The bypass pipe branches from the main pipe and is set to be smaller in flow rate of the exhaust gas than the main pipe. The gas sensor is arranged in the bypass pipe to detect a gas contained in the exhaust gas. The cooler cools the bypass pipe.

What is claimed is: 
     
         1 . A gas combustor comprising:
 a main pipe as an exhaust pipe that discharges exhaust gas generated at combustion of gas fuel;   a bypass pipe that branches from the main pipe and is set to be smaller in flow rate of the exhaust gas than the main pipe;   a gas sensor arranged in the bypass pipe to detect a gas contained in the exhaust gas; and   a cooler that cools the bypass pipe.   
     
     
         2 . The gas combustor according to  claim 1 , wherein
 the cooler is arranged at least upstream of the gas sensor in the bypass pipe.   
     
     
         3 . The gas combustor according to  claim 2 , comprising
 a water supply tank to which water is supplied, wherein   the water stored in the water supply tank is heated by the combustion of the gas fuel, and   the cooler cools the bypass pipe by using the water being supplied to the water supply tank.   
     
     
         4 . The gas combustor according to  claim 1 , comprising
 a check valve provided at a position in the main pipe between an inlet and an outlet of the bypass pipe.   
     
     
         5 . The gas combustor according to  claim 4 , wherein
 the check valve is configured to be opened when a flow rate of the exhaust gas flowing through the bypass pipe exceeds a certain value, and the check valve is configured such that a pressure of the exhaust gas flowing through the main pipe becomes equal to a pressure of the exhaust gas flowing through the bypass pipe.   
     
     
         6 . The gas combustor according to  claim 5 , wherein
 the check valve is configured to generate a pressure loss of the exhaust gas flowing therethrough which is equal to a pressure loss in the bypass pipe at a maximum flow rate of the exhaust gas.