Exhaust gas recycling control system of combustion device

Abstract

An exhaust gas recycling control system includes a combination device, having inlet and exhaust ends. The exhaust end is connected to the inlet end by a recycling tube which has a control valve to control an open or closed state. An oxygen sensor mounted detects oxygen content in an exhaust gas and convert the oxygen content detected signal into a voltage signal sent to a controller. The controller controls the control valve to open or close. When the oxygen content of the exhaust gas is higher than a threshold, the control valve opens and a high oxygen content of exhaust gas flows through the recycling tube to the inlet end.

What is claimed is: 
     
         1 . An exhaust gas recycling control system of combustion device, comprising:
 a combustion device having an inlet end and an exhaust end; an air conditioning unit arranged before the inlet end to adjust the supply of cold air;   wherein the exhaust end is connected with a recycling tube to the inlet end, and the recycling tube includes a control valve thereon to control the recycling tube being in an opened or closed state;   an oxygen sensor mounted on the exhaust end or the recycling tube to detect an oxygen content in an exhaust gas and convert an oxygen content detected signal into a voltage signal being sent to a controller; and   the controller has a computer processing capability to receive the signal of the oxygen sensor as a control of the control valve being in the opened or closed state;   when the oxygen content in the exhaust gas is higher than a set value of the controller, the control valve opens and a high oxygen content of exhaust gas flows through the recycling tube to the inlet end to be reuse.   
     
     
         2 . The exhaust gas recycling control system of combustion device as claimed in  claim 1 , wherein the combustion device includes a boiler, an incinerator, and a power generation device. 
     
     
         3 . The exhaust gas recycling control system of combustion device as claimed in  claim 1 , wherein the control valve includes a gate valve, a magnetic valve, and a butterfly valve. 
     
     
         4 . The exhaust gas recycling control system of combustion device as claimed in  claim 3 , wherein the butterfly valve is connected to a servomotor for the controller to control an operation of the servomotor, in order to control the butterfly valve being in the opened or closed state. 
     
     
         5 . The exhaust gas recycling control system of combustion device as claimed in  claims 1 , wherein the recycling tube further includes a blower controlled by the controller, being turned on or off. 
     
     
         6 . The exhaust gas recycling control system of combustion device as claimed in  claim 5 , wherein the blower is driven by a variable-frequency motor to control a rotation speed of the blower. 
     
     
         7 . The exhaust gas recycling control system of combustion device as claimed in  claim 6 , wherein the controller further includes a setting input interface and a display unit.