TWI869088B - Flame measuring system of industrial burner and method thereof - Google Patents

Abstract

A testing device and method for immersing materials in high-temperature and high-pressure hydrogen gas are disclosed. The testing device includes a testing rig of burner; a burner, installed on the testing rig of burner; a flame detecting rod, inserted in the testing rig of burner; a thermal radiation sensor, arranged outside of the testing rig of burner to receive thermal radiation from the flame detecting rod; a pressure gauge, inserted in the testing rig of burner; a control module, electrically connected to a regulating valve of the burner; a signal module, electrically connected to the pressure gauge and the thermal radiation sensor; and a computing host, electrically connected to the control module and the signal module; wherein the signal module receives an analog signal data from the pressure gauge and the thermal radiating sensor, converts the analog signal data into a digital signal data, and then sends it to the computing host for processing, calculation and analysis.

Description

Burner flame measurement system and method

The present invention is a measuring device. In particular, it refers to a burner flame measuring system and method.

Currently, it is not possible to effectively measure the flame geometry and temperature characteristics of a burner in an industrial furnace. The burner can only be set up in an open space, which causes the flame characteristics of the burner to be different from those in an industrial furnace. Furthermore, the flame temperature of the burner can basically only be measured directly through thermocouples, and most thermal imagers cannot capture flame temperature images. Thermocouples are single-point measurements. If you want to fully measure the flame temperature characteristics of a burner with thermocouples, it will take a lot of time.

Based on the above reasons, one purpose of the present invention is to provide a burner flame measurement system and method, which can allow the burner to operate in a simulated industrial furnace and perform flame measurement at the same time, so that the measurement result will be closer to the actual situation; and, the burner can be operated in a simulated industrial furnace and the flame temperature distribution corresponding to the heated area on the flame detection rod can be obtained at one time with minimal interference to the flame flow field. This measurement method belongs to line measurement, which can greatly reduce the measurement time.

To achieve the above-mentioned object, the present invention provides a burner flame measurement system, comprising: a test chamber, which is a cylindrical structure; a burner, which is installed on one end surface of the test chamber, and a regulating valve and a flow meter are respectively provided on a front end pipeline of a fuel inlet and a front end pipeline of a combustion air inlet of the burner, and each regulating valve is used to adjust the unit time to enter The volume of the fuel and the volume of the combustion-supporting air of the burner are measured by the flow meters, respectively, and the volume of the fuel and the volume of the combustion-supporting air entering the burner per unit time; a flame detection rod, one end of which is inserted into the test chamber and has a heated area corresponding to the burner; a thermal radiation sensor, which is arranged outside the test chamber and is used to receive each of the heated areas on the flame detection rod. The heat radiation at the heated position; a pressure gauge, one end of which is inserted in the test chamber to measure the pressure in the test chamber; a control module, electrically connected to the regulating valve, for controlling the opening of the regulating valve; a signal module, electrically connected to the flow meter, the pressure gauge, and the thermal radiation sensor; and a host, electrically connected to the control module and the signal module, wherein the control module The group receives a digital signal sent by the host, converts the digital signal into an analog signal and transmits it to the regulating valve to change the opening of the regulating valve; and wherein the signal module receives analog signal data from the flow meter, the pressure gauge, and the thermal radiation sensor, converts the analog signal data into digital signal data, and transmits it to the host for processing, calculation and analysis.

In some embodiments, the test chamber includes a carcass, a flue gas box, and a length adjustment mechanism, the carcass is connected to the flue gas box, and the length adjustment mechanism is axially movable in the carcass.

In some embodiments, the carcass has at least one flame tube and a plurality of smoke pipes inside; the flame tube is a hollow tubular structure, arranged coaxially with the carcass, the smoke pipes are arranged along the axis of the carcass, and the smoke pipes are arranged in the outer area of the flame tube.

In some embodiments, the body has a first circular end surface and a second circular end surface, the first circular end surface has a first opening, the burner is installed at the first opening, and the second circular end surface has a second opening connected to the flame tube and a third opening connected to the plurality of smoke pipes.

In some embodiments, the flue gas box is a cylindrical structure and is mechanically connected to an exhaust pipe. A third circular end face of the flue gas box is mechanically connected to the second circular end face of the carcass. The flue gas box is coaxially arranged with the carcass.

In some embodiments, the length adjustment mechanism has a baffle, a screw and a control wheel. The baffle is a cylindrical structure and is mechanically connected to the screw. The baffle and the screw are coaxially arranged. The screw and the control wheel are mechanically connected. The length adjustment mechanism is arranged on the first circular end face of the flue gas box. The screw is coaxially arranged with the flame tube. Rotating the control wheel allows the baffle to move along the axial direction of the flame tube to adjust the position of the baffle in the flame tube.

In some embodiments, the carcass further includes a cooling cavity, a plurality of sensing channels, and a fire viewing window; the cooling cavity is defined by the area formed by the outer side of the flame tube and the cylindrical inner side of the carcass, the interior of the cooling cavity is filled with a cooling medium, and has a first cooling cavity opening and a second cooling cavity opening, both of which are located at the surface of the carcass, the first cooling cavity opening is a cooling medium inlet, and the second cooling cavity opening is a cooling medium outlet; the sensing channels are arranged along the radial direction of the carcass, and each of the sensing channels is a The tubular structure has a first sensing channel opening and a second sensing channel opening, the first sensing channel opening is located on the surface of the carcass, and the second sensing channel opening is located on the inner surface of the flame tube; the smoke pipe and the sensing channels pass through the cooling cavity; the flame viewing window is arranged on the surface of the carcass, and the position corresponds to a flame observation opening on the flame tube. The flame viewing window has an opening and closing function. After opening the flame viewing window, a cover plate configuration on the flame tube can be adjusted to change the range of the flame observation opening.

The present invention also provides a burner flame measurement method, including: obtaining an emissivity estimate of a flame detection rod; installing a burner in a test chamber; setting the configuration of the test chamber, adjusting the position of a block in a flame tube in the test chamber according to the combustion condition of a burner to be simulated, thereby changing a working length of the flame tube; setting a fuel flow rate and a combustion-supporting air flow rate of the burner; starting the burner; adjusting the pressure of the flame tube; installing a flame detection rod; measuring a thermal radiation of the flame detection rod; and calculating the temperature of each heated position in a heated area of the flame detection rod.

In some embodiments, the step of obtaining an emissivity estimate of a flame detection rod includes installing a burner, setting the configuration of a test chamber, setting the fuel flow rate and the combustion air flow rate, starting the burner, adjusting the pressure of the flame tube, sequentially installing a flame detection rod in each of a plurality of sensing channels, sequentially measuring the thermal radiation at the front end of each of the flame detection rods and the temperature of the thermocouple in the plurality of sensing channels, and calculating the emissivity of each of the flame detection rods to select the emissivity estimate.

In some embodiments, the front end of each flame detection rod in the step of obtaining an emissivity estimate of a flame detection rod has a thermocouple to measure the temperature of the thermocouple at the front end of each flame detection rod.

In some embodiments, a formula for the relationship between thermal radiation and temperature is P=εσ T ⁴ , where P is the thermal radiation intensity, ε is the emissivity, σ is the Stefan-Boltzmann constant, and T is the temperature.

In some embodiments, the step of calculating an emissivity of each flame detection rod to select the emissivity estimation value is to change the emissivity of each flame detection rod by trial and error, and calculate the temperature of the front end of each flame detection rod by the formula, and compare the temperature data of the thermocouple to calculate the error of the two temperatures; the average value is calculated by calculating the multiple errors of each flame detection rod set in multiple sensing channels, and the emissivity corresponding to the minimum average error is selected as the emissivity estimation value of the flame detection rod.

In some embodiments, after the step of sequentially installing flame detection rods in a plurality of sensing channels, there is also a step of installing a standard detection rod in at least one sensing channel, wherein the standard detection rod has a standard length dimension.

In some embodiments, after the step of sequentially measuring the thermal radiation at the front end of the flame detection rod and the temperature of the thermocouple in a plurality of sensing channels, a step of measuring the size conversion ratio value of the two-dimensional signal of the thermal radiation sensor in at least one sensing channel is added to obtain the actual space length corresponding to the adjacent signal points, thereby obtaining the temperature information of the flame and the length size information of the flame.

The above has been a fairly broad overview of the technical features and advantages of the present disclosure, so that the detailed description of the present disclosure below can be better understood. Other technical features and advantages that constitute the subject matter of the patent application scope of the present disclosure will be described below. Those with ordinary knowledge in the technical field to which the present disclosure belongs should understand that the concepts and specific embodiments disclosed below can be easily used to modify or design other structures or processes to achieve the same purpose as the present disclosure. Those with ordinary knowledge in the technical field to which the present disclosure belongs should also understand that such equivalent constructions cannot deviate from the spirit and scope of the present disclosure as defined by the attached patent application scope.

100: Burner flame measurement system

101: Test Chamber

102: Burner

103: Flame detection rod

1031: Heated area

104: Thermal radiation sensor

105: Regulating valve

106: Flow meter

107: Pressure gauge

108: Control module

109:Signal module

110:Host

111: Body

112: Smoke box

113: Length adjustment mechanism

114: Flame tube

115: Flue gas pipe

116: Cooling chamber

117: Sensing channel

118: Fire-watching window

119: Cylindrical surface

120: First circular end surface

121: Second circular end surface

122: First opening

123: Second opening

124: The third opening

125: Exhaust pipe

126: Cylindrical surface

127: Third circular end surface

128: The fourth opening

129:Block

130: Screw

131: Steering wheel

132: The fourth opening

133: Gas composition detection rod

134: Regulating valve

135: Flame observation opening

136: Cover plate

137: First sensing channel opening

138: Second sensing channel opening

139: First cooling chamber opening

140: Second cooling chamber opening

141: Combustion air inlet

142: Fuel inlet

143: Spray nozzle

144: Front-end pipeline

145: Front-end pipeline

146: Thermocouple

1461: Temperature measurement point

147: Flame to be tested

148: Latch

S100: Burner flame measurement method

S110~S180: Steps

S210~S280: Steps

S271, S272: Steps

Figure 1 is a schematic diagram of the structure of the burner flame measurement system of the present invention.

Figure 2 is a schematic front view of the test chamber of the burner flame measurement system of the present invention.

Figure 3 is a schematic cross-sectional view of the test chamber of the burner flame measurement system of the present invention.

Figure 4 is a schematic diagram of the burner flame measurement method of the present invention.

Figure 5 is a schematic diagram of the flame detection rod installation for measuring the burner flame temperature in the burner flame measurement method of the present invention.

FIG6 is a flow chart showing the steps of obtaining the estimated emissivity value of the flame detection rod in the burner flame measurement method of the present invention.

FIG. 7A is a schematic diagram of the flame detection rod used in the burner flame measurement method of the present invention.

FIG. 7B is a schematic diagram of a flame detection rod with a thermocouple used in obtaining an estimated value of the emissivity of the flame detection rod in the burner flame measurement method of the present invention.

Figure 8 is a schematic diagram of the flame detection rod installation for measuring the burner flame temperature in the burner flame measurement method of the present invention.

The specific implementation of the present invention is described in detail below in combination with specific circumstances.

FIG1 is a schematic diagram of the structure of the burner flame measurement system of the present invention. FIG2 is a schematic diagram of the front view of the test chamber of the burner flame measurement system of the present invention. FIG3 is a schematic diagram of the cross-section of the test chamber of the burner flame measurement system of the present invention. The burner flame measurement system 100 of the present invention includes a test chamber 101, a burner 102 (refer to FIG5 and FIG8), a flame detection rod 103, a thermal radiation sensor 104, a regulating valve 105, a flow meter 106, a pressure gauge 107, a control module 108, a signal module 109 and a host 110.

Please refer to Figures 1 to 3 at the same time. The test chamber 101 is a barrel-shaped structure. The barrel-shaped structure of the present invention is illustrated as a circle, and can also be other shapes, such as a rectangle, an ellipse, or any other shape. The "circle" in the following text is an example, but is not limited to this. The test chamber 101 includes a hull 111, a smoke box 112, and a length adjustment mechanism 113.

In some embodiments, the body 111 is a cylindrical structure, and has a flame tube 114, a plurality of smoke pipes 115, a cooling cavity 116, a plurality of sensing channels 117, and a flame viewing window 118. The body 111 has a cylindrical surface 119, a first circular end surface 120, and a second circular end surface 121 on the outside. The first circular end surface 120 has a first opening 122, and the burner 102 to be tested is installed in the first opening 122. The second circular end surface 121 has a second opening 123 connected to the flame tube 114, and a third opening 124 connected to the plurality of smoke pipes 115.

The flue gas box 112 is a cylindrical structure, connected to an exhaust pipe 125. The flue gas box 112 has a cylindrical surface 126 and a third circular end surface 127 on the outside. The cylindrical surface 126 has a fourth opening 128, which is mechanically connected to the inlet of the exhaust pipe 125, and the third circular end surface 127 of the flue gas box 112 is mechanically connected to the second circular end surface 121 of the body 111, and the axis of the flue gas box 112 coincides with the axis of the body 111, that is, the flue gas box 112 and the body 111 are coaxially arranged.

In some embodiments, the exhaust pipe 125 is arranged along the radial direction of the flue gas box 112. The exhaust pipe 125 has at least one fourth opening 132, and a latch 148 can be provided to close the fourth opening 132, or a connector can be provided to connect the gas composition detection rod 133, the pressure gauge 107, or the thermocouple (not shown). The outlet of the exhaust pipe 125 is provided with a regulating valve 134, and the opening of the regulating valve 134 can be changed through the control module 108 based on the measured value set on the sensing pressure gauge 107, so that the pressure in the flame tube 114 meets the test requirements.

The length adjustment mechanism 113 has a baffle 129, a screw 130 and an operating wheel 131. The baffle 129 is a cylindrical structure, the baffle 129 and the screw 130 are mechanically connected, the axis of the baffle 129 coincides with the axis of the screw 130 (that is, the baffle 129 and the screw 130 are coaxially arranged), and the screw 130 and the operating wheel 131 are mechanically connected. The position of the baffle 129 is set to simulate the size and shape of an actual burner to predict the combustion performance of a specific burner power when the burner implements a high temperature process. The length adjustment mechanism 113 is disposed on the third circular end surface 127 of the flue gas box 112. The axis of the screw 130 coincides with the axis of the flame tube 114 (i.e., the screw 130 and the flame tube 114 are coaxially disposed). Therefore, by rotating the control wheel 131, the baffle 129 can be moved axially along the flame tube 114 to adjust the position of the baffle 129 in the flame tube 114. Therefore, the length adjustment mechanism 113 simulates the actual effects of various combustion furnace shapes on the combustion flame by allowing the baffle 129 to move axially.

The flame tube 114 is a hollow tubular structure. The flame tube 114 is arranged along the axis of the body 111. The axis of the flame tube 114 coincides with the axis of the body 111 (i.e., the flame tube 114 and the body 111 are arranged coaxially). The flame tube 114 has a flame observation opening 135. The flame observation opening is provided with a plurality of cover plates 136. The cover plates 136 can be removed according to individual test requirements to adjust the range of the flame observation opening 135.

The flue gas pipe 115 is arranged along the axial direction of the body 111. The flue gas pipe 115 is arranged in the outer area of the flame tube 114 and is connected to the flame tube 114. Because the block 129 will prevent the flue gas from directly flowing into the flue gas box 112, a plurality of flue gas pipes 115 connected to the flame tube 114 are arranged. After the flue gas after combustion flows into the flue gas pipe 115, it is guided into the flue gas box 112 and then discharged through the exhaust pipe 125, which will be described in the following paragraphs.

The sensing channel 117 is arranged along the radial direction of the body 111. Referring to FIG5 , the sensing channel 117 is a tubular structure having a first sensing channel opening 137 and a second sensing channel opening 138. The first sensing channel opening 137 is located on the cylindrical surface of the body 111, and the second sensing channel opening 138 is located on the cylindrical surface on the inner side of the flame tube 114, that is, the first sensing channel opening 137 and the second sensing channel opening 138 are interconnected. The first sensing channel opening 137 may be provided with a latch 148 to close the first sensing channel opening 137, or a connector (not shown) may be provided to enable the flame detection rod 103, the pressure gauge 107, or the thermocouple (refer to FIG7B ) to be stably arranged in the sensing channels. As shown in FIG. 7B , a front end of the flame detection rod 103 is provided with a thermocouple 146 for detecting the flame 147 to be detected of the burner 102. The number and interval of the installation of multiple flame detection rods 103 can be determined according to the length and type of the flame.

The cooling cavity 116 is defined by the area formed by the outer side of the flame tube 114 and the cylindrical inner side of the body 111. The cooling cavity 116 is filled with a cooling medium and has a first cooling cavity opening 139 and a second cooling cavity opening 140, both of which are located on the cylindrical surface of the body 111. That is, the first cooling cavity opening 139 is the cooling medium inlet, and the second cooling cavity opening 140 is the cooling medium outlet. The flue gas pipe 115 and the sensing channel 117 pass through the cooling cavity 116.

The flame viewing window 118 is arranged on the cylindrical surface of the body 111, and its position corresponds to the flame observation opening 135 on the flame tube 114. The flame viewing window 118 has an opening and closing function. After opening the flame viewing window 118, the configuration of the cover plate 136 on the flame tube 114 can be adjusted to change the range of the flame observation opening 135.

The burner 102 is mounted on the first circular end face 120 of the body 111, and the axis of the burner 102 coincides with the axis of the flame tube 114, that is, the burner 102 and the flame tube 114 are coaxially arranged. Please refer to Figure 5 at the same time. The burner 102 has a combustion air inlet 141, a fuel inlet 142 and a nozzle 143. The burner 102 can be provided with an ignition device (not shown) and a flame detector (not shown). After the burner 102 is started and ignited, the flame will be located in the flame tube 114, and the flue gas will enter the flue gas box 112 through the flue gas pipe 115, and then leave the test chamber 101 from the exhaust pipe 125.

A regulating valve 105 and a flow meter 106 are respectively provided on a front end pipeline 144 of the fuel air inlet 141 of the burner 102 and a front end pipeline 145 of the fuel inlet 142. Each regulating valve 105 is used to adjust the volume of fuel and the volume of combustion air entering the burner 102 per unit time, and each flow meter 106 is used to measure the volume of fuel and the volume of combustion air entering the burner 102 per unit time. The regulating valve 105 is electrically connected to the control module 108. After receiving a signal sent by the host computer 110, the control module 108 adjusts the opening of each regulating valve 105 accordingly. For example, the control module 108 receives a digital signal sent by the host computer 110, converts it into an analog signal and sends it to the regulating valve 105 to change the opening of the regulating valve 105. The flow meter 106, the pressure gauge 107, the thermocouple 146 (refer to FIG. 7B ), the thermal radiation sensor 104 and the signal module 109 are electrically connected. The signal module 109 receives the sensing signal data (such as analog signal data) of the flow meter 106, the pressure gauge 107, the thermocouple 146 (refer to FIG. 7B ), and the thermal radiation sensor 104, converts it into digital signal data, and transmits it to the host 110 for processing, calculation and analysis.

After the burner 102 is started and ignited, the flame detection rod 103 will be heated by the flame to generate thermal radiation, and the thermal radiation sensor 104 will receive the thermal radiation of each heated position in the heated area of the flame detection rod 103; the host 110 stores the emissivity of the flame detection rod 103. When the thermal radiation generated by the flame detection rod 103 is stable, the temperature of each heated position in the heated area of the flame detection rod 103 can be calculated using the following formula, that is, the flame temperature distribution of the flame cross section where the flame detection rod 103 is located can be obtained. The formula is P=εσ T ⁴ , where P is the thermal radiation intensity, ε is the emissivity, σ is the Stefan-Boltzmann constant, and T is the temperature.

FIG4 is a flow chart of the burner flame measuring method of the present invention. FIG5 is a schematic diagram of the installation of a flame detection rod for measuring the burner flame temperature in the burner flame measuring method of the present invention. FIG7A is a schematic diagram of the flame detection rod used in the burner flame measuring method of the present invention. Please refer to FIG4, FIG5 and FIG7A, the burner flame measuring method S100 of the present invention includes obtaining an emissivity estimate of a flame detection rod (step S200); installing a burner in a test chamber (step S110); setting the configuration of the test chamber, and adjusting the position of a block in a flame tube in the test chamber according to the combustion condition of a burner to be simulated, thereby changing a working length of the flame tube (step S110). S120); set a fuel flow rate and a combustion air flow rate of the burner (step S130); start the burner (step S140); adjust the pressure of the flame tube (step S150); install a flame detection rod (step S160); measure a thermal radiation of the flame detection rod (step S170); and calculate the temperature of each heated position in a heated area of the flame detection rod (step S180). The flame detection rod 103 used in steps S110 to S180 is shown in FIG. 7A, and the flame detection rod 103 is not provided with a thermocouple. Step S200 will be described in detail in the subsequent paragraphs.

In step S120, the combustion condition may be the power of the burner, the size of the furnace body of a combustion furnace to be simulated, the relative distance between the furnace wall and the burner, or a combination of the above factors.

In the step of setting the fuel flow rate and the combustion air flow rate (i.e., step S130), the fuel flow rate entering the burner 102 and the air flow rate entering the burner 102 are set to adjust the flame appearance geometry and the flame temperature characteristics to meet the burner design specifications.

In the step of starting the burner (i.e., step S140), the flame is ignited by the ignition device, and the flame detector is used to confirm whether the flame is generated.

In the step of adjusting the pressure of the flame tube (i.e., step S150), the opening of the regulating valve 134 at the outlet of the exhaust pipe 125 is changed according to the measured value of the pressure gauge (not shown) or the pressure gauge 107 disposed at the first sensing channel opening 137 of the sensing channel 117, so that the pressure in the flame tube 114 meets the requirements. That is, the pressure of the flame tube is adjusted to meet the pressure conditions of the combustion furnace to be simulated.

In the step of installing the flame detection rod (i.e., step S160), please refer to the installation diagram of the flame detection rod 103 for measuring the flame temperature of the burner shown in FIG5.

In the step of measuring the thermal radiation of the flame detection rod (i.e., step S170), the thermal radiation sensor 104 receives the thermal radiation of each heated position of the heated area 1031 (see FIGS. 7A and 7B ) on the flame detection rod 103, and the analog signal is converted into digital signal data by the signal module and transmitted to the host 110.

In the step of calculating the temperature of each heated position in the heated area of the flame detection rod (i.e., step S180), the host 110 estimates the temperature of each heated position in the heated area 1031 on the flame detection rod 103 based on the stored estimated emissivity value of the flame detection rod 103, and obtains the flame temperature distribution of the flame cross section where the flame detection rod 103 is located.

FIG6 is a flow chart of the steps of obtaining the estimated value of the emissivity of the flame detection rod in the burner flame measurement method of the present invention. FIG7B is a schematic diagram of the flame detection rod with a thermocouple used in obtaining the estimated value of the emissivity of the flame detection rod in the burner flame measurement method of the present invention. FIG8 is a schematic diagram of the flame detection rod installation for measuring the burner flame temperature in the burner flame measurement method of the present invention. Please refer to Figures 6, 7A and 8 to obtain an emissivity estimate of a flame detection rod (i.e., step S200), wherein the emissivity estimate is obtained by comparing the thermal radiation temperature value at the front end of the flame detection rod calculated by the preliminary emissivity estimate with the temperature value measured by the actual thermocouple. When the error is within plus or minus 30°C, it can be considered as a better emissivity estimate. If the error is greater than plus or minus 30°C, the emissivity estimate is recalculated. Step S200 includes installing the burner (step S210), setting the configuration of the test chamber (step S220), setting the fuel flow rate and the combustion air flow rate (step S230), starting the burner (step S240), adjusting the pressure of the flame tube (step S250), sequentially installing a flame detection rod in each of the plurality of sensing channels (step S260), sequentially measuring the thermal radiation at the front end of each flame detection rod and the temperature of the thermocouple (step S270), and calculating an emissivity of each flame detection rod to select the emissivity estimation value (step S280). Among them, steps S210~S250 are similar to steps S110~S150, so they will not be repeated here.

In the step of sequentially installing a flame detection rod in each of the plurality of sensing channels (i.e., step S260), as shown in FIG7, a thermocouple 146 is further arranged in the flame detection rod 103, and the temperature data of each thermocouple 146 and the temperature calculated value at the front end of each flame detection rod 103 are compared, and the average value is calculated by the plurality of errors of each flame detection rod 103 arranged in the plurality of sensing channels 117, and the emissivity corresponding to the minimum average error is selected as the emissivity estimation value of the flame detection rod 103; and the temperature measurement point 1461 of the thermocouple 146 is arranged at the front end of the flame detection rod 103; please also refer to FIG8, which is a schematic diagram of the installation of the flame detection rod 103 when the flame detection rod 103 is executing to obtain an emissivity estimation value of the flame detection rod (i.e., step S200).

In the step of sequentially measuring the thermal radiation at the front end of the flame detection rod and the temperature of the thermocouple in a plurality of sensing channels (i.e., step S270), the thermal radiation sensor 104 receives the thermal radiation at the front end of the flame detection rod 103, and its analog signal data is converted into digital signal data by the signal module 109 and transmitted to the host 110. Furthermore, the temperature measuring point 1461 of the thermocouple 146 at the front end of the flame detection rod 103, its analog signal data is converted into digital signal data by the signal module 109 and transmitted to the host 110.

In the step of calculating the emissivity of the flame detection rod (i.e., step S280), the emissivity of the flame detection rod 103 is changed by trial and error, and the temperature of the front end of the flame detection rod 103 is calculated by the aforementioned formula, and the temperature data of the thermocouple 146 is compared to calculate the error of the two temperatures; the average value is calculated from the multiple errors of each flame detection rod 103 set in the multiple sensing channels 117, and the emissivity corresponding to the minimum average error is selected as the estimated emissivity value of the flame detection rod 103.

In some embodiments, after the step of sequentially measuring the thermal radiation at the front end of each flame detection rod and the temperature of the thermocouple (i.e., step S270), a step of installing a standard detection rod in at least one sensing channel (i.e., step S271) is added, wherein the standard detection rod has a standard length dimension; and the thermal radiation at the front end of the flame detection rod and the temperature of the thermocouple are sequentially measured in a plurality of sensing channels. After the step of measuring the temperature of the flame (i.e., step S270), a step of measuring the size conversion ratio value of the two-dimensional signal of the thermal radiation sensor in at least one sensing channel is added (i.e., step S272), thereby obtaining the actual space length corresponding to the adjacent signal points. In this way, the burner flame measurement method S100 of the present invention can not only obtain the temperature information of the flame, but also include the length size information of the flame. The thermal radiation of the flame detection rod 103 is sensed through a thermal radiation sensor. The thermal radiation sensor can be a thermal imager, which is installed outside the test chamber 101. The thermal radiation of the heated area 1031 of the flame detection rod 103 is received through the fire viewing window 118. The radial heat distribution of the flame in a specific section of the flame tube can be observed by a single flame detection rod. At the same time, the axial heat distribution of the flame can be observed by combining multiple flame detection rods, thereby obtaining a full picture of the flame temperature distribution.

By using the above structure and method, the burner can be operated in a simulated industrial furnace and flame measurement can be performed at the same time, so that the measurement results will be closer to the actual situation; moreover, the burner can be operated in a simulated industrial furnace and the flame temperature distribution corresponding to the heated area on the flame detection rod can be obtained at one time with minimal interference to the flame flow field. This measurement method belongs to line measurement, which can greatly reduce the measurement time.

100: Burner flame measurement system

101: Test Chamber

103: Flame detection rod

104: Thermal radiation sensor

107: Pressure gauge

108: Control module

109:Signal module

110:Host

134: Regulating valve

Claims (13)

A burner flame measurement system comprises: a test chamber in a barrel-shaped structure; a burner installed on one end surface of the test chamber, a front end pipeline of a fuel inlet of the burner and a front end pipeline of a combustion air inlet are respectively provided with a regulating valve and a flow meter, each regulating valve is used to adjust the volume of fuel and the volume of combustion air entering the burner per unit time, and each flow meter is used to measure the volume of fuel and the volume of combustion air entering the burner per unit time; a flame detection rod, one end of which is inserted in the test chamber and has a heated area corresponding to the burner; a thermal radiation sensor is arranged outside the test chamber and is used to receive the flame detection signal. The heat radiation of each heated position of the heated area on the rod; a pressure gauge, one end of which is inserted in the test chamber to measure the pressure in the test chamber; a control module, electrically connected to each of the regulating valves, for controlling the opening of each of the regulating valves; a signal module, electrically connected to the flow meter, the pressure gauge, and the thermal radiation sensor; and a host, electrically connected to the control module and the signal module, wherein the control module adjusts the opening of each of the regulating valves accordingly after receiving a signal transmitted by the host; and wherein the signal module receives a sensing signal data of the flow meter, the pressure gauge, and the thermal radiation sensor, and transmits it to the host for processing, calculation and analysis. A burner flame measurement system as described in claim 1, wherein the test chamber includes a carcass, a flue gas box, and a length adjustment mechanism, the carcass is connected to the flue gas box, and the length adjustment mechanism is axially movable in the carcass. A burner flame measurement system as described in claim 2, wherein the body has at least one flame tube and a plurality of smoke pipes inside; the flame tube is a hollow tubular structure, arranged coaxially with the body, the smoke pipes are arranged along the axis of the body, and the smoke pipes are arranged in the outer area of the flame tube and are connected to the flame tube. A burner flame measurement system as described in claim 3, wherein the body has a first end face and a second end face, the first end face has a first opening, the burner is mounted on the first opening, and the second end face has a second opening connected to the flame tube and a third opening connected to the plurality of smoke pipes. The burner flame measurement system as described in claim 4, wherein the flue gas box is a cylindrical structure and is connected to an exhaust pipe, a third end face of the flue gas box is connected to the second end face of the carcass, and the flue gas box is coaxially arranged with the carcass. The burner flame measurement system as described in claim 5, wherein the length adjustment mechanism has a baffle, a screw and an operating wheel, the baffle is a columnar structure and is coaxially arranged with the screw, and the screw is connected to the operating wheel; the length adjustment mechanism is arranged on the third end face of the flue gas box, the screw is coaxially arranged with the flame tube, and the operating wheel can be rotated to allow the baffle to move along the axial direction of the flame tube to adjust the position of the baffle in the flame tube. The burner flame measurement system as described in claim 3, wherein the carcass further includes a flame viewing window disposed on the surface of the carcass, corresponding to a flame observation opening on the flame tube, and the thermal radiation sensor is disposed opposite to the flame viewing window. The burner flame measurement system as described in claim 3, wherein the body also includes a plurality of sensing channels for the flame detection rods to extend into the flame tube, the sensing channels are arranged along the radial direction of the body, each sensing channel is a tubular structure, having a first sensing channel opening and a second sensing channel opening, the first sensing channel opening is located on the surface of the body, and the second sensing channel opening is located on the inner surface of the flame tube. The burner flame measurement system as described in claim 3, wherein the carcass further includes a cooling cavity, the cooling cavity is defined in the area formed by the outer side of the flame tube and the cylindrical inner side of the carcass, the interior of the cooling cavity is filled with a cooling medium, and has a first cooling cavity opening and a second cooling cavity opening, both located at the surface of the carcass, the first cooling cavity opening is a cooling medium inlet, and the second cooling cavity opening is a cooling medium outlet. A burner flame measurement method used in a burner flame measurement system as claimed in claim 1, comprising: obtaining an emissivity estimate of a flame detection rod; installing a burner in a test chamber; setting the configuration of the test chamber, adjusting the position of a baffle in a flame tube in the test chamber according to the combustion condition of a burner to be simulated, thereby changing a working length of the flame tube; setting a fuel flow rate and a combustion-supporting air flow rate of the burner; starting the burner; adjusting the pressure of the flame tube; installing a flame detection rod; measuring a thermal radiation of the flame detection rod; and calculating the temperature of each heated position in a heated area of the flame detection rod. The burner flame measurement method as described in claim 10, wherein the step of obtaining the emissivity estimate of the flame detection rod includes installing the burner, setting the configuration of the test chamber, setting the fuel flow rate and the combustion air flow rate, starting the burner, adjusting the pressure of the flame tube, sequentially installing a flame detection rod in each of the plurality of sensing channels, sequentially measuring the thermal radiation at the front end of each of the flame detection rods and the temperature of the thermocouple, and calculating an emissivity of each of the flame detection rods to select the emissivity estimate. The burner flame measurement method as described in 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, and the temperature data of each thermocouple and the calculated temperature value of the front end of each flame detection rod are compared, and the average value is calculated by calculating the multiple errors of each flame detection rod set in multiple sensing channels, and the emissivity corresponding to the minimum average error is selected as the estimated emissivity value of the flame detection rod. A burner flame measurement method as described in claim 12, wherein, after the step of sequentially measuring the thermal radiation at the front end of the flame detection rod and the temperature of the thermocouple in a plurality of sensing channels, a step of measuring the dimension conversion ratio value of the two-dimensional signal of the thermal radiation sensor in at least one sensing channel is added to obtain the actual spatial length corresponding to the adjacent signal points, thereby obtaining the temperature information of the flame and the length dimension information of the flame.

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