Gas combustion-control method and gas combustion device

Abstract

A gas combustion device 1 comprises a combustor 11 for burning fuel gas supplied from a gas source, an air blower 15 for adjusting the amount of air in a cylindrical casing 5 which contains the combustor 11 therein; an ejector 7 with a primary air hole 37 for sucking a primary air into a gas passage leading from the gas source to the combustor 11 due to negative pressure caused by flow rate of the fuel gas supplied to the combustor 11 and an ignition device 9 for igniting mixed gas injected from a wick 39 provided ahead of the ejector 7. When fire is set to the mixed gas of the wick 39, ignitability of the mixed gas is improved by decreasing the amount of air in the casing. After ignition, combustion is maintained in the state where combustibility of the combustion gas in the combustor 11 is improved by increasing the amount of air in the casing 5.

1 . A gas combustion control method in a gas combustion device having a combustor for burning fuel gas supplied from a gas source; an air amount adjustment device for adjusting the amount of air in a cylindrical casing which contains the combustor therein; a wick for injecting mixed gas generated by mixing the fuel gas supplied from the gas source to the combustor and air in the casing into a combustion chamber; an ignition device for igniting the mixed gas injected from the wick; and a controller for controlling the air amount adjustment device and the ignition device, comprising the steps of: 
 a first air amount adjustment step of controlling the air amount adjustment device so as to decrease the amount of air in the casing before the mixed gas injected from the wick is ignited;    an ignition step of igniting the mixed gas; and    a second air amount adjustment step of operating the air amount adjustment device at higher power than the first air amount adjustment step so as to increase the amount of air in the casing after the ignition step.    
   
   
       2 . A gas combustion control method of  claim 1 , wherein the air amount adjustment device further comprises an air blower for flowing the air heated by the combustor to the side of a vent of the casing, and in the first amount adjustment step, the controller decreases the amount of air blast of the air blower, and in the second amount adjustment step, the controller increases the amount of air blast of the air blower.  
   
   
       3 . A gas combustion device comprising: 
 a combustor for burning fuel gas supplied from a gas source;    an air amount adjustment device for adjusting the amount of air in a cylindrical casing which contains the combustor therein;    a wick for injecting mixed gas generated by mixing the fuel gas supplied from the gas source to the combustor and air in the casing into a combustion chamber;    an ignition device for igniting the mixed gas injected from the wick;    an ignition detection device for detecting ignition of the mixed gas in the combustor and    a controller for controlling at least the air amount adjustment device and the ignition device on the basis of a signal from the ignition detection device, wherein    the controller controls the air amount adjustment device so as to decrease the amount of air in the casing when the ignition detection does not detect ignition and controls the air amount adjustment device so as to increase the amount of air in the casing when the ignition detection detects ignition.    
   
   
       4 . A gas combustion device of  claim 3 , wherein the air amount adjustment device has an air blower for flowing the air heated by the combustor to the side of a vent of the casing.  
   
   
       5 . A gas combustion device of  claim 3  further comprising: a first suction port for sucking outside air to be mixed with the gas before the ignition detection device detects ignition, and a second suction port and a third suction port for sucking outside air by the air amount adjustment device after the ignition detection device detects ignition.  
   
   
       6 . A gas combustion device of  claim 3  further comprising an open-and-close valve which opens or closes a supply pipe for supplying the gas to the combustor, wherein the controller controls the open-and-close valve.  
   
   
       7 . A gas combustion control method in a gas combustion device having a combustor for burning fuel gas supplied from a gas source; an air amount adjustment device for adjusting the amount of air in a cylindrical casing which contains the combustor therein; a wick for injecting mixed gas generated by mixing the fuel gas supplied from the gas source to the combustor and air in the casing into a combustion chamber; an ignition device for igniting the mixed gas injected from the wick; an ignition detection device for detecting ignition of the mixed gas in the combustor; an open-and-close valve for supplying the fuel gas into the combustor; and a controller for controlling the air amount adjustment device and the ignition device, comprising the steps of: 
 operating the air amount adjustment device at low power and blowing air into the casing;    opening the open-and-close valve to supply the fuel gas;    mixing a primary air sucked in the casing and the fuel gas to generate the mixed gas;    injecting the mixed gas;    igniting the mixed gas by the ignition device;    operating the air amount adjustment device at high power when the ignition detection device detects ignition;    sucking a secondary air into the casing; and    sucking a tertiary air into the casing.