Flame measuring system of industrial burner and method thereof

Abstract

A flame measuring system of an industrial burner and a method thereof are provided. The flame measuring system of the industrial burner includes: a test chamber; an industrial burner installed on the test chamber; a flame detection rod inserted in the test chamber; a thermal radiation sensor disposed outside the test chamber to receive a thermal radiation on the flame detection rod; a pressure gage inserted in the test chamber; a control module electrically connected to a regulating valve of the industrial burner; a signal module electrically connected to the pressure gage and the thermal radiation sensor; and a host electrically connected to the control module and the signal module. The signal module receives analog signal data of the pressure gage and the thermal radiation sensor, converts the analog signal data into digital signal data, and transmits the digital signal data to the host for processing, calculation, and analysis.

1 . A flame measuring system of an industrial burner, comprising:
 a test chamber in a barrel-shaped structure;   an industrial burner installed on an end face of the test chamber, a front pipeline of a fuel inlet and a front pipeline of a combustion air inlet of the industrial burner respectively comprising a regulating valve and a flow gage, each regulating valve being configured to adjust a volume of fuel and a volume of combustion air entering the industrial burner per unit time, and each flow gage being configured to measure the volume of the fuel and the volume of the combustion air entering the industrial burner per unit time;   a flame detection rod having an end inserted in the test chamber and having a heated area corresponding to the industrial burner;   a thermal radiation sensor disposed outside the test chamber for receiving a thermal radiation of each heated position of the heated area on the flame detection rod;   a pressure gage having an end inserted in the test chamber to measure a pressure in the test chamber;   a control module electrically connected to the regulating valves for controlling and changing openings of the regulating valves;   a signal module electrically connected to the flow gage, the pressure gage, and the thermal radiation sensor; and   a host electrically connected to the control module and the signal module, wherein the control module correspondingly adjusts the openings of the regulating valves after receiving a signal transmitted by the host, and the signal module receives sensing signal data of the flow gage, the pressure gage, and the thermal radiation sensor, and then transmits the sensing signal data to the host for processing, calculation, and analysis.   
     
     
         2 . The flame measuring system of the industrial burner according to  claim 1 , wherein the test chamber comprises a body, a flue gas box, and a length adjusting mechanism, the body being communicated with the flue gas box and the length adjusting mechanism being axially movable in the body. 
     
     
         3 . The flame measuring system of the industrial burner according to  claim 2 , wherein the body internally has at least one flame tube and a plurality of flue gas tubes, the flame tube being in a hollow tubular structure and being disposed coaxially with the body, the flue gas tubes being disposed in an axial direction of the body, and the flue gas tubes being disposed in an outer area of the flame tube and communicated with the flame tube. 
     
     
         4 . The flame measuring system of the industrial burner according to  claim 3 , wherein the body has a first end face and a second end face, the first end face having a first opening, the industrial burner being installed in the first opening, and the second end face having a second opening communicated with the flame tube and a third opening communicated with the plurality of flue gas tubes. 
     
     
         5 . The flame measuring system of the industrial burner according to  claim 4 , wherein the flue gas box is in a cylindrical structure and is communicated with an exhaust tube, a third end face of the flue gas box is communicated with the second end face of the body, and the flue gas box is disposed coaxially with the body. 
     
     
         6 . The flame measuring system of the industrial burner according to  claim 2 , wherein the length adjusting mechanism has a stopper, a screw rod, and a control wheel, the stopper having a columnar structure and being disposed coaxially with the screw rod, and the screw rod being connected to the control wheel; and the length adjusting mechanism is disposed on the third end face of the flue gas box, the screw rod is disposed coaxially with the flame tube, and the control wheel is rotated to move the stopper in an axial direction of the flame tube so as to adjust a position of the stopper in the flame tube. 
     
     
         7 . The flame measuring system of the industrial burner according to  claim 2 , wherein the body further comprises a flame viewing window disposed on a surface of the body and corresponding to a flame viewing opening on the flame tube, and the thermal radiation sensor is disposed oppositely to the flame viewing window. 
     
     
         8 . The flame measuring system of an industrial burner according to  claim 3 , wherein the body further comprises a plurality of sensing channels allowing the flame detection rods to extend into the flame tube, the sensing channels being disposed in a radial direction of the body, each sensing channel being in a tubular structure and having a first sensing channel opening and a second sensing channel opening, the first sensing channel opening being located at a surface of the body, and the second sensing channel opening being located on an inner surface of the flame tube. 
     
     
         9 . The flame measuring system of an industrial burner according to  claim 2 , wherein the body further comprises a cooling cavity, the cooling cavity being defined in an area formed by an outer side of the flame tube and a cylindrical inner side of the body, the cooling cavity being internally filled with a cooling medium, and having a first cooling cavity opening and a second cooling cavity opening both located at a surface of the body, the first cooling cavity opening being a cooling medium inlet, and the second cooling cavity opening being a cooling medium outlet. 
     
     
         10 . A flame measuring method of an industrial burner using a flame measuring system of an industrial burner that comprises a test chamber in a barrel-shaped structure; an industrial burner installed on an end face of the test chamber, a front pipeline of a fuel inlet and a front pipeline of a combustion air inlet of the industrial burner respectively comprising a regulating valve and a flow gage, each regulating valve being configured to adjust a volume of fuel and a volume of combustion air entering the industrial burner per unit time, and each flow gage being configured to measure the volume of the fuel and the volume of the combustion air entering the industrial burner per unit time; a flame detection rod having an end inserted in the test chamber and having a heated area corresponding to the industrial burner; a thermal radiation sensor disposed outside the test chamber for receiving a thermal radiation of each heated position of the heated area on the flame detection rod; a pressure gage having an end inserted in the test chamber to measure a pressure in the test chamber; a control module electrically connected to the regulating valves for controlling and changing openings of the regulating valves; a signal module electrically connected to the flow gage, the pressure gage, and the thermal radiation sensor; and a host electrically connected to the control module and the signal module, wherein the control module correspondingly adjusts the openings of the regulating valves after receiving a signal transmitted by the host, and the signal module receives sensing signal data of the flow gage, the pressure gage, and the thermal radiation sensor, and then transmits the sensing signal data to the host for processing, calculation, and analysis, the method comprising:
 obtaining an estimated emissivity value of a flame detection rod;   installing an industrial burner in a test chamber;   setting a configuration of the test chamber, and adjusting a position of a stopper in a flame tube in the test chamber according to a burning condition of a burning furnace to be simulated, thus changing a working length of the flame tube;   setting a fuel flow rate and a combustion air flow rate of the industrial burner;   starting the industrial burner;   adjusting a pressure of the flame tube;   installing a flame detection rod;   measuring a thermal radiation of the flame detection rod; and   calculating a temperature of each heated position in a heated area of the flame detection rod.   
     
     
         11 . The flame measuring method of the industrial burner according to  claim 10 , wherein the step of obtaining the estimated emissivity value of the flame detection rod comprises installing the industrial burner, setting the configuration of the test chamber, setting the fuel flow rate and the combustion air flow rate, starting the industrial burner, adjusting the pressure of the flame tube, sequentially installing flame detection rods in a plurality of sensing channels, sequentially measuring a thermal radiation of a front end of each flame detection rod and a temperature of a thermocouple, and calculating an emissivity of each flame detection rod to select the estimated emissivity value. 
     
     
         12 . The flame measuring method of the industrial burner according to  claim 11 , wherein the front end of each flame detection rod in the step of obtaining the estimated emissivity value of the flame detection rod has a thermocouple, temperature data of each thermocouple and a temperature calculation value of the front end of each flame detection rod are compared, an average value is calculated by a plurality of errors of each flame detection rod disposed in a plurality of sensing channels, and an emissivity corresponding to a minimum average error is selected as the estimated emissivity value of the flame detection rod. 
     
     
         13 . The flame measuring method of the industrial burner according to  claim 12 , wherein after the step of sequentially measuring the thermal radiation of the front end of the flame detection rod and the temperature of the thermocouple in the plurality of sensing channels, a step of measuring a size conversion ratio value of a two-dimensional signal of a thermal radiation sensor in at least one sensing channel is added to obtain an actual space length corresponding to adjacent signal points, thus obtaining temperature information of a flame and length and size information of the flame.