JP2017075882A - Calorimeter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a calorimeter which can improve easiness of installation by reduction in size and which can suppress deterioration in measurement accuracy, while making continuous measurement possible.SOLUTION: A calorimeter 20 for obtaining a calorific value on the basis of increase in temperature during combustion of a fuel gas includes: a pipe material 25 through which the fuel gas as a measurement object flows; a catalyst layer 26 which is provided inside the pipe material 25 and which makes the fuel gas to catalytically combust; a coil 27 for heating a portion on the pipe material 25, at which the catalyst layer 26 is provided; and a temperature measurement part 28 for outputting a signal corresponding to the temperature at the portion.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a calorimeter.

  2. Description of the Related Art Conventionally, a Junkers-type flowing water gas calorimeter and a calorimeter using a gas chromatograph method are known. The Junkers-type flowing water gas calorimeter heats flowing water at a constant flow rate with combustion heat obtained by combustion of fuel gas, and obtains the calorific value of the fuel gas from the temperature rise and flow rate of the flowing water. A calorimeter using the gas chromatograph method measures the composition component of the fuel gas using the gas chromatograph, and multiplies the component of each concentration obtained by the measurement with the calorific value, thereby generating the heat of the fuel gas. The amount is to be calculated. However, the Junkers flow water type gas calorimeter and the calorimeter using the gas chromatograph method have a problem that, based on the principle, continuous calorific value cannot be measured.

  Thus, a rapid response calorimeter has been proposed as one capable of continuous measurement. This rapid response calorimeter sends fuel gas and air to the combustor, and heats up the fuel gas by calculation from the rise temperature, fuel gas flow rate, and air flow rate when they are burned in the combustor. The amount is obtained (see Patent Document 1). Since it is such a structure, since fuel gas and air can be continuously supplied to a combustor and the temperature can be measured, the calorific value can be measured. Therefore, in principle, continuous measurement is possible.

  Also, calorimeters such as a gas density calorimeter and a thermal conductivity calorimeter have been proposed. The gas density calorimeter obtains the density of the fuel gas and obtains the calorific value by utilizing the correlation between the calorific value and the gas density. The heat conduction calorimeter calculates the heat conductivity of the fuel gas, and uses the fact that there is a correlation between the heat generation and the heat conductivity (see Patent Document 2).

  A calorimeter using catalytic combustion has also been proposed. In this calorimeter, a reference gas and a sample gas are flowed from a fixed-volume chamber toward the catalyst device, and at that time, a pressure that decreases is detected by a pressure converter to calculate a molar flow rate. Furthermore, the calorimeter also detects the combustion heat in the catalyst device, and calculates the calorific value from the molar flow rate and the combustion heat (see Patent Document 3).

Japanese Patent No. 4844377 Japanese Patent No. 4890874 Japanese National Patent Publication No. 11-506537

  However, the rapid response calorimeter described in Patent Document 1 is originally made on the assumption that it is used at the production site of city gas, and since the combustion part has a certain size, it is large as a whole. It is not easy to install. In addition, gas density calorimeters and thermal conductivity calorimeters (calorimeters described in Patent Document 2) have a problem that the accuracy deteriorates when air components are mixed in. It is difficult to obtain accuracy. Furthermore, the calorimeter using catalytic combustion described in Patent Document 3 also has a certain size in the combustor and does not escape the increase in size.

  The present invention has been made to solve such a conventional problem, and an object of the present invention is to reduce the size and increase the ease of installation while enabling continuous measurement. An object of the present invention is to provide a calorimeter capable of suppressing a decrease in measurement accuracy.

  A calorimeter according to the present invention is a calorimeter for obtaining a calorific value based on a temperature rise when fuel gas is burned, and is provided inside a pipe material through which a fuel gas to be measured flows. A catalyst layer for catalytically burning the fuel gas, a heat generation source for heating a portion on the pipe member on which the catalyst layer is provided, and a temperature measuring means for outputting a signal corresponding to the temperature at the portion. It is characterized by.

  According to this calorimeter, since it includes a pipe, a catalyst layer for catalytic combustion of fuel gas inside the pipe, and a heat generation source for heating a portion on the pipe where the catalyst layer is provided, heat generation by the heat generation source and The fuel gas can be combusted by catalytic combustion using the catalyst layer. For this reason, it becomes possible to continue burning the fuel gas by the heat generated by the heat source and the contact combustion using the catalyst layer while continuously flowing the fuel gas, and the calorific value can be continuously measured. In addition, because of the above configuration, the portion that functions as the combustion portion of the fuel gas fits in the size of the tube diameter. For example, when the heat generation source is a coil, the flow passage that allows the fuel gas to flow also includes the coil. Since it can be made slightly larger, downsizing is possible. In addition, since the calorific value is obtained based on the actual temperature rise when the fuel gas is burned, it is not necessary to perform component analysis or the like, and it is possible to prevent a decrease in measurement accuracy. Therefore, while enabling continuous measurement, it is possible to improve the ease of installation by reducing the size, and to suppress a decrease in measurement accuracy.

  In the calorimeter of the present invention, it is preferable that the heat source is a heater that is attached to the outside of the tube material at a site on the tube material on which the catalyst layer is provided and to which a voltage from a voltage source is applied.

  According to this calorimeter, since the heat source is a heater attached to the outside of the pipe material on the pipe material provided with the catalyst layer, the heater can be attached to the outside of the pipe material, so that the heater can be downsized. As a result, the ease of installation can be improved.

  In the calorimeter of the present invention, it is preferable that the calorimeter further includes a protective container that houses a portion of the pipe material on which the catalyst layer is provided, the catalyst layer, the heat generation source, and the temperature measuring means.

  According to this calorimeter, since it further includes a protective container for housing the portion of the pipe material where the catalyst layer is provided, the catalyst layer, the heat generation source, and the temperature measuring means, the detection temperature fluctuates due to the influence of wind, for example. It is possible to prevent a situation where the measurement accuracy of the quantity is lowered.

  Further, in the calorimeter of the present invention, the temperature measuring means is constituted by two thermocouples, one functioning as a hot junction provided outside the pipe material of the part, and the other being separated from the part. It is preferable to function as a cold junction provided as a reference temperature junction.

  According to this calorimeter, since it has a hot junction provided outside the pipe of the part where the catalyst layer is provided and a cold junction provided apart from the part, the temperature rise is accurately calculated based on these differences. Compared with the case of only the hot junction, it is less affected by the surrounding environment, and the calorific value measurement accuracy can be improved.

  The calorimeter of the present invention further includes a calorific value calculating means for calculating a calorific value based on the temperature measured by the temperature measuring means, and the calorific value calculating means circulates fuel gas inside the pipe. The initial value of the temperature measured by the temperature measuring means when the temperature is not measured is compared with the value of the temperature newly measured by the temperature measuring means when the fuel gas is not circulating inside the pipe. It is preferable that the amount of fluctuation is calculated, and the amount of heat generation is calculated after taking the amount of fluctuation into consideration with respect to the temperature measured by the temperature measuring means when the fuel gas is circulating inside the pipe.

  According to this calorimeter, the amount of fluctuation is calculated by comparing the initial value of the temperature measured when the fuel gas is not circulating inside the tube with the value of the newly measured temperature. The calorific value is calculated after adding the fluctuation amount to the temperature measured when the fuel gas is circulating inside. In this way, by comparing the initial value of the temperature when the fuel gas is not circulating with the newly measured temperature value, the measured value has drifted due to long-term use of the calorimeter Can also correct this.

  The calorimeter of the present invention further includes a calorific value calculating means for calculating a calorific value based on the temperature measured by the temperature measuring means, and the calorific value calculating means circulates fuel gas inside the pipe. Preferably, the calorific value is calculated based on an average value of values excluding the highest value and the lowest value among the temperature values for a plurality of times measured by the temperature measuring means.

  According to this calorimeter, the calorific value is calculated based on the average value of the values excluding the highest and lowest values among the temperature values measured multiple times when the fuel gas is circulating inside the pipe. In order to calculate, even if there is an instantaneously abnormal value depending on the surrounding environment, this abnormal value can be removed and the average value is adopted for calculating the calorific value, so the calorific value measurement accuracy Can be improved.

  According to the present invention, it is possible to provide a calorimeter that enables continuous measurement, can be downsized, can be easily installed, and can suppress a decrease in measurement accuracy.

It is a block diagram which shows the measurement system containing the calorimeter which concerns on embodiment of this invention. It is a side view which shows the structure of the calorimeter shown in FIG. It is a block diagram which shows the detail of the protective container shown in FIG. 2, (a) shows a side perspective view, (b) shows a front view, (c) shows a rear view, (d) shows A top view is shown. It is a graph which shows the correlation data memorize | stored in the arithmetic unit shown in FIG. It is a graph which shows the temperature condition at the time of supplying different fuel gas to a calorimeter continuously.

  Preferred embodiments of the present invention will be described below with reference to the drawings. However, the present invention is not limited to the following embodiments.

  FIG. 1 is a block diagram showing a measurement system including a calorimeter according to an embodiment of the present invention. The measurement system 1 shown in FIG. 1 includes a gas mixing device 10 and a calorimeter 20, and supplies a mixed gas obtained by mixing the combustible gas and air by the gas mixing device 10 to the calorimeter 20 as a fuel gas. The calorimeter 20 measures the calorific value by burning the fuel gas.

  In such a measurement system 1, the gas mixing device 10 includes first to third pipes 11 to 13, first and second flow meters 14 a and 14 b, first and second valves 15 a and 15 b, and a mixer 16. It consists of and.

  The first pipe 11 is a pipe that connects the upstream regulator and the mixer 16, and guides the combustible gas flowing through the regulator to the mixer 16. The first flow meter 14 a is provided on the first pipe 11 and measures the flow rate of the combustible gas flowing through the first pipe 11. The first valve 15 a is a needle valve provided on the downstream side of the first flow meter 14 a of the first pipe 11.

  The second pipe 12 is a pipe connecting the upstream regulator and the mixer 16, and guides the air flowing through the regulator to the mixer 16. The second flow meter 14 b is provided on the second pipe 12 and measures the flow rate of air flowing through the second pipe 12. The second valve 15 b is a needle valve provided on the downstream side of the second flow meter 14 b of the second pipe 12.

  The mixer 16 mixes combustible gas and air flowing through the first and second pipes 11 and 12. The third pipe 13 is a pipe for supplying the mixed gas obtained by mixing by the mixer 16 to the calorimeter 20 as fuel gas.

  The calorimeter 20 includes a combustion function unit 21, a constant voltage source (voltage source) 22, a data logger 23, and an arithmetic device (heat generation amount calculation means) 24. The combustion function unit 21 burns the fuel gas from the gas mixing device 10 and burns the fuel gas using the voltage from the constant voltage source 22. The data logger 23 records the temperature in the combustion function unit 21, and particularly records the temperature that rises due to the combustion of the fuel gas. The arithmetic unit 24 is, for example, a PC (Personal Computer), and obtains the calorific value of the fuel gas supplied to the combustion function unit 21 based on the contents recorded in the data logger 23. Further, when the calorific value is obtained, the arithmetic device 24 also inputs the measured values of the first and second flow meters 14a and 14b.

  FIG. 2 is a side view showing the configuration of the calorimeter 20 shown in FIG. As shown in FIG. 2, the calorimeter 20 includes a pipe member 25, a catalyst layer 26, a coil (heat generation source, heater) 27, and a temperature measurement unit (temperature measurement means) 28.

  The pipe material 25 is a pipe through which the fuel gas to be measured flows, and is constituted by a ceramic pipe (material is alumina) in this embodiment. In this embodiment, the pipe material 25 has an outer diameter of 3 mm and an inner diameter of 2 mm, for example.

  The catalyst layer 26 is applied and provided on the inner side of the pipe member 25, and is used for catalytic combustion of fuel gas. In the present embodiment, the catalyst layer 26 is composed of a catalyst such as palladium or platinum. Further, the catalyst layer 26 is applied to a specific portion (a portion of about 25 mm) on the distal end side of the tube material 25.

  The coil 27 heats a specific part where the catalyst layer 26 is provided. Specifically, the specific part where the catalyst layer 26 is provided (hereinafter, the specific part of the pipe 25 and the catalyst layer 26 are combined to form the combustion portion F). And a voltage from the constant voltage source 22 is applied. This coil 27 is comprised by metal wires, such as a platinum wire, and will heat the combustion part F to about 300 to 600 degreeC by voltage application.

  The pipe member 25 is not limited to a ceramic tube, and may be another material as long as it can withstand the heating temperature of the combustion section F. However, it is a condition that even a material that can withstand is not adversely affected (for example, poisoning) on the catalyst layer 26.

  The temperature measurement unit 28 outputs a signal corresponding to the temperature in the combustion unit F. More specifically, the temperature measurement unit 28 includes two thermocouples 28a and 28b, one is a first thermocouple 28a that functions as a hot junction provided outside the tube of the combustion unit F, and the other is a combustion unit. A second thermocouple 28b that is provided apart from F and functions as a cold junction serving as a reference temperature junction. Here, when the temperature of the combustion part F is raised by the coil 27 and fuel gas is supplied to the combustion part F, the fuel gas burns in the combustion part F. At this time, the temperature of the combustion part F rises. The 1st thermocouple 28a outputs the signal according to such temperature. On the other hand, the second thermocouple 28b is separated to the extent that it is not substantially affected by the temperature rise due to combustion, and the temperature is substantially the same between when the fuel gas is burned and when not burning in the combustion section F. . Thus, the second thermocouple 28b outputs a signal corresponding to the reference temperature.

  In the above configuration, the pipe material 25, the catalyst layer 26, the coil 27, and the temperature measuring unit 28 constitute the combustion function unit 21 shown in FIG.

  Furthermore, as shown in FIG. 2, the calorimeter 20 includes a protective container 29. 3 is a configuration diagram showing details of the protective container 29 shown in FIG. 2, wherein (a) shows a side perspective view, (b) shows a front view, and (c) shows a rear view. , (D) shows a top view.

  First, as shown in FIG. 3 (a), the protective container 29 includes a tip side of the pipe material 25 (including at least the combustion part F), a catalyst layer 26, a coil 27, and a first thermocouple 28a (one of the temperature measurement parts 28). Part). The second thermocouple 28 b is provided outside the protective container 29. The protective container 29 prevents the temperature detected by the first thermocouple 28a from fluctuating due to, for example, wind.

  In the protective container 29, a pipe material support portion 29a is provided. The tube material support portion 29a is a member that protrudes from the bottom surface to the top surface of the protective container 29, and on which the tube material 25 in the protective container 29 is placed.

  As shown in FIGS. 3B and 3C, the protective container 29 includes a flat bottom plate 29b and a rectangular plate 29c having a concave shape whose cross section covers the upper surface side of the bottom plate 29b. ing. Further, as shown in FIG. 3B, the front end of the cylindrical body formed by the bottom plate 29b and the rectangular plate 29c is closed on the front surface of the protective container 29 (upstream with respect to the flow of the fuel gas). A closing plate 29d is provided. The closing plate 29d is separated into a first plate 29d1 and a second plate 29d2. The first plate 29d1 and the second plate 29d2 are formed with semicircular cutouts 29e1 and 29e2 into which the pipe material 25 is inserted. It is supposed to function. Further, as shown in FIG. 3C, a closing plate 29f is provided on the rear surface of the protective container 29 (downstream with respect to the flow of the fuel gas) in the same manner as the front surface. Unlike the front surface side, the closing plate 29f is composed of a single plate material.

  Further, as shown in FIG. 3 (d), an opening 29g is formed on the upper surface of the protective container 29 (that is, the surface of the rectangular plate 29c facing the bottom plate 29b), and a metal mesh 29h is provided on the opening 29g. It has been. Exhaust gas generated by the combustion of the combustion section F is discharged out of the protective container 29 through the wire mesh 29h.

  The protective container 29 has a length (FIG. 3 (a) left-right direction) of about 120 mm, a height (FIG. 3 (b) (c) vertical direction) of about 45 mm, and a width (FIG. 3). (B) (c) left-right direction) is about 50 mm. Thus, the protective container 29 has a size that does not become excessively large by not making the size in units of meters, for example.

  In the calorimeter 20, the arithmetic unit 24 functions as a unit that calculates the amount of heat generation based on the temperature measured by the temperature measuring unit 28 (that is, temperature information recorded by the data logger 23). In calculating the calorific value, the arithmetic unit 24 stores correlation data indicating the correlation between the temperature rise in the combustion section F and the calorific value. The correlation data is obtained as follows.

First, a temperature rise is measured when a known fuel gas is flowed in the combustion section F and burned. Thereby, for example, the data shown in Tables 1 to 3 below are obtained.

On the other hand, it is known that the calorific value when combustible gas is burned is the calorific value shown in Table 4.

Here, for example, the calorific value of hydrogen is 286 kJ / mol, so the calorific value of the fuel gas with a hydrogen concentration of 1.5% can be calculated as 286 (kJ / mol) × 0.015 = 4.29 kJ / mol. . Similarly, the calorific value when the hydrogen concentration is 0.5% and the calorific value when the hydrogen concentration is 1.0% can also be calculated. Then, when these calorific values calculated and Table 1 are combined, the following Table 5 is obtained.

Similarly, Table 6 is also obtained.

  Although omitted, if the calorific values shown in Tables 5 and 6 are added, those corresponding to Table 3 can be calculated in the same manner.

  Then, when the relationships shown in Table 5 and Table 6 are graphed, the correlation data shown in FIG. 4 is obtained. FIG. 4 is a graph showing correlation data stored in the arithmetic device 24 shown in FIG. In FIG. 4, the horizontal axis indicates the calorific value (kJ / mol), and the vertical axis indicates the temperature rise (° C.).

  As shown in FIG. 4, the calorific value and the temperature increase have a proportional relationship in all of the combustion gas containing hydrogen, the combustion gas containing methane, and the combustion gas containing both hydrogen and methane. I can say that. Therefore, the arithmetic unit 24 stores the data shown in FIG. 4, a primary arithmetic expression indicating a proportional relationship, and the like, thereby calculating the amount of heat generation based on the temperature information recorded by the data logger 23. be able to.

  The arithmetic device 24 preferably has at least one of the following two functions. First, as a first function, the arithmetic unit 24 uses the initial value of the temperature measured by the temperature measurement unit 28 when the fuel gas is not circulating inside the pipe member 25 (for example, the calorimeter 20 is used first for combustion). The temperature when the part F is heated for a predetermined time is stored. Then, the arithmetic unit 24 newly obtains a temperature value measured by the temperature measuring unit 28 when the fuel gas is not circulating inside the pipe member 25, and compares this with the stored value to obtain the amount of variation. calculate. Further, the arithmetic unit 24 calculates the heat generation amount after taking into account the fluctuation amount with respect to the temperature measured by the temperature measurement unit 28 when the fuel gas flows inside the pipe member 25 and burns in the combustion unit F. To do. Thereby, even if the measured value drifts due to long-term use of the calorimeter 20, it can be corrected based on the calculated fluctuation amount.

  Further, as a second function, the arithmetic unit 24 is configured such that, among the temperature values measured by the temperature measurement unit 28 when the fuel gas flows inside the pipe member 25 and is burned in the combustion unit F, The calorific value is calculated based on the average value excluding the highest value and the lowest value. As a result, even if the situation becomes an abnormal value instantaneously depending on the surrounding environment, this abnormal value can be removed and the average value is adopted for the calculation of the calorific value. This is because it can be improved.

  Next, how the calorific value is measured by the calorimeter 20 according to the present embodiment will be described. First, the first and second valves 15a and 15b shown in FIG. 1 are controlled so that the combustible gas and air flow through the first and second pipes 11 and 12 and are mixed by the mixer 16, so that the combustible having a predetermined concentration is obtained. Fuel gas containing gas is generated. The fuel gas is supplied to the calorimeter 20 through the third pipe 13. At this time, the first and second flow meters 14 a and 14 b measure the respective gas flow rates flowing through the first and second pipes 11 and 12, and this information is output to the arithmetic device 24.

  In the calorimeter 20 shown in FIG. 2, the constant voltage source 22 applies a voltage to the coil 27, and the temperature of the combustion part F is about 300 ° C. or more and 600 ° C. or less. In this state, when fuel gas is supplied to the combustion section F, the temperature of the combustion section F rises due to the combustion heat of the fuel gas. The first thermocouple 28a transmits a signal corresponding to the temperature before and after the rise to the data logger 23, and the data logger 23 stores this.

  The computing device 24 calculates the calorific value from the correlation data shown in FIG. 4, the stored contents of the data logger 23, and the data of the first and second flow meters 14a and 14b. In addition, in this embodiment, since the 2nd thermocouple 28b is provided, you may make it use the temperature difference of the 1st thermocouple 28a and the 2nd thermocouple 28b.

  The exhaust gas generated by the combustion is discharged to the outside through the wire mesh 29h on the upper surface of the protective container 29.

  FIG. 5 is a graph showing temperature conditions when different fuel gases are continuously supplied to the calorimeter 20. The temperature shown in FIG. 5 is the temperature of the first thermocouple 28a.

  First, the initial temperature at time 0 is, for example, 388 ° C., and includes a combustible gas having a methane concentration of 1.0% and a hydrogen concentration of 0.5% in the first period from time 0 to time 12 minutes. Assuming that the fuel gas is supplied to the calorimeter 20, the temperature rises to 409.6 ° C. at the time of 12 minutes as shown by the one-dot chain line in FIG. The computing device 24 calculates the amount of heat generation based on the data shown in FIG. 4 from a temperature rise of 409.6 to 388 = 21.6 ° C., for example.

  Furthermore, assuming that fuel gas containing a combustible gas having a methane concentration of 2.0% and a hydrogen concentration of 1.0% is supplied to the calorimeter 20 in the second period from time 12 minutes to time 24 minutes, an alternate long and short dash line in FIG. As shown, the temperature rises to 436.7 ° C. at 24 minutes. The arithmetic unit 24 calculates the amount of heat generation based on the data shown in FIG. 4 from the temperature rise of 436.7-388 = 48.7 ° C., for example.

  Also, in the third period from time 24 minutes to time 26 minutes, assuming that fuel gas containing a combustible gas having a methane concentration of 4.0% and a hydrogen concentration of 1.5% is supplied to the calorimeter 20, a one-dot chain line in FIG. As shown, the temperature rises to 489.2 ° C. at 24 minutes. The computing device 24 calculates the amount of heat generation based on the data shown in FIG. 4 from a temperature rise of 489.2−387 = 101.2 ° C., for example.

  In addition, the graph shown in FIG. 5 also shows the temperature condition when supplying only hydrogen or fuel gas containing only methane in the first to third periods.

  First, in the first period, a fuel gas containing a combustible gas having a hydrogen concentration of 0.5% is supplied to the calorimeter 20, and in the second period, a fuel gas containing a combustible gas having a hydrogen concentration of 1.0% is supplied to the calorimeter 20. It is assumed that fuel gas containing a combustible gas having a hydrogen concentration of 1.5% is supplied to the calorimeter 20 in the third period. At this time, as shown by the solid line in FIG. 5, the temperature rises 2.4 ° C. at the time 12 minutes, 6.4 ° C. rises at the time 24 minutes, and 10.0 ° C. at the time 36 minutes. To rise. The arithmetic unit 24 calculates the amount of heat generation from these temperature rises based on the data shown in FIG.

  Similarly, in the first period, a fuel gas containing a combustible gas having a methane concentration of 1.0% is supplied to the calorimeter 20, and in a second period, a fuel gas containing a combustible gas having a methane concentration of 2.0% is supplied to the calorimeter 20. It is assumed that fuel gas containing combustible gas having a methane concentration of 4.0% is supplied to the calorimeter 20 in the third period. At this time, as shown by a two-dot chain line in FIG. 5, the temperature rises by 19.8 ° C. at the time of 12 minutes, rises by 44.1 ° C. at the time of 24 minutes, and reaches 92. Increase by 4 ° C. The arithmetic unit 24 calculates the amount of heat generation from these temperature rises based on the data shown in FIG.

  As described above, the calorimeter 20 according to the present embodiment can continuously measure the calorific value by continuously detecting the temperature.

  In the above description, when calculating the amount of generated heat, the temperatures at the end times of the first to third periods, which are 12 minutes, 24 minutes, and 36 minutes, are employed, but the temperature is not limited to this. As long as it is stable, the temperature at the time before 12 minutes, 24 minutes, and 36 minutes may be adopted. In particular, as the second function described above, when the arithmetic unit 24 executes the process, for example, the temperature is 30 times, 31 minutes, 32 minutes, 33 minutes, 34 minutes, 35 minutes, and 36 minutes in total, for example, six times. The heat generation amount may be calculated based on the data shown in FIG. 4 or the like from the average value of the four temperatures excluding the highest value and the lowest value.

  Thus, according to the calorimeter 20 according to the present embodiment, the pipe member 25, the catalyst layer 26 for catalytic combustion of the fuel gas inside the pipe member, and the specific portion on the pipe member 25 where the catalyst layer 26 is provided. Therefore, the fuel gas can be burned by the heat generated by the heat source and the contact combustion using the catalyst layer 26. For this reason, it becomes possible to continue burning the fuel gas by the heat generated by the heat source and the contact combustion using the catalyst layer 26 while continuously flowing the fuel gas, and the calorific value can be continuously measured. In addition, because of the above configuration, the portion that functions as the fuel gas combustion portion F fits in the size of the tube diameter. For example, when the heat source is the coil 27 as in the above embodiment, the coil 27 is included. Since the size can be made slightly larger than the flow path through which the fuel gas is circulated, the size can be reduced. In addition, since the calorific value is obtained based on the actual temperature rise when the fuel gas is burned, it is not necessary to perform component analysis or the like, and it is possible to prevent a decrease in measurement accuracy. Therefore, while enabling continuous measurement, it is possible to improve the ease of installation by reducing the size, and to suppress a decrease in measurement accuracy.

  Moreover, since the heat source is the coil 27 attached to the outside of the pipe member 25 at a specific portion on the pipe member 25 on which the catalyst layer 26 is provided, the coil 27 having a size that can be attached to the outside of the pipe member 25 It is possible to improve the ease of installation by reducing the size.

  In addition, since the protective container 29 that houses the catalyst layer 26, the coil 27, and the first thermocouple 28a (a part of the temperature measuring unit 28) is further provided, for example, the detection temperature fluctuates due to the influence of the wind, and the amount of generated heat It is possible to prevent a situation where the measurement accuracy is lowered.

  Moreover, since it has the 1st thermocouple 28a provided in the pipe material outer side of the site | part in which the catalyst layer 26 is provided, and the 2nd thermocouple 28b provided spaced apart from the said site | part, based on these differences, it is the amount of temperature rise. As compared with the case of only the first thermocouple 28a, it is less affected by the surrounding environment, and the measurement accuracy of the calorific value can be improved.

  In addition, the fluctuation amount is calculated by comparing the initial value of the temperature measured when the fuel gas is not circulating inside the tube material 25 and the newly measured temperature value. The calorific value is calculated after adding the fluctuation amount to the temperature measured when the gas is circulating. Thus, by comparing the initial value of the temperature when the fuel gas is not circulating with the newly measured temperature value, the measured value has drifted due to long-term use of the calorimeter 20. However, this can be corrected.

  Moreover, in order to calculate the calorific value based on the average value of the values excluding the highest value and the lowest value among the temperature values for a plurality of times measured when the fuel gas is circulating inside the pipe member 25, Even if there is an instantaneously abnormal value depending on the surrounding environment, this abnormal value can be removed and the average value is adopted for calculating the calorific value, so that the accuracy of calorific value measurement can be improved. Can do.

  As described above, the present invention has been described based on the embodiment, but the present invention is not limited to the above embodiment, and may be modified without departing from the gist of the present invention.

  For example, although the calorimeter 20 includes the protective container 29 in the present embodiment, the configuration is not limited thereto, and a configuration without the protective container 29 may be used. Moreover, although the catalyst layer 26 is provided in the tip specific part of the pipe material 25, the catalyst layer 26 is not limited thereto, and may be provided in the middle of the pipe material 25 in the longitudinal direction.

  Furthermore, in the present embodiment, the coil 27 has been described as a heat source. However, the present invention is not limited to this, and other heaters (for example, a rubber heater that can be attached to a specific portion) may be used. A means for sending hot air or the like for heating the part may be used.

  Further, in the present embodiment, the protective container 29 accommodates only the first thermocouple 28a that is a part of the temperature measuring unit 28, but may further accommodate the second thermocouple 28b. . In addition, the temperature measurement unit 28 is configured by two members, ie, two thermocouples 28a and 28b, but is not limited thereto, and may be configured by one sensor unit or the like.

1: Measurement system 20: Calorimeter 21: Combustion function unit 22: Constant voltage source (voltage source)
23: Data logger 24: Arithmetic device (heat generation amount calculation means)
25: Tubing material 26: Catalyst layer 27: Coil (heat source, heater)
28: Temperature measuring section (temperature measuring means)
28a: 1st thermocouple (hot junction)
28b: Second thermocouple (cold junction)
29: Protection container F: Combustion section

Claims (6)

A calorimeter for obtaining a calorific value based on a temperature rise when fuel gas is burned,
A pipe material through which the fuel gas to be measured flows,
A catalyst layer provided on the inner side of the tube material for catalytic combustion of the fuel gas;
A heat source that heats a portion on the pipe member on which the catalyst layer is provided;
Temperature measuring means for outputting a signal corresponding to the temperature in the part;
A calorimeter comprising: The calorimeter according to claim 1, wherein the heat source is a heater that is attached to the outside of the tube material at a site on the tube material on which the catalyst layer is provided, and to which a voltage from a voltage source is applied. The said pipe | tube material is further equipped with the protection container which accommodates the site | part in which the said catalyst layer is provided, the said catalyst layer, the said heat-generation source, and the said temperature measurement means. Calorimeter. The temperature measuring means is composed of two thermocouples, one of which functions as a hot contact provided outside the pipe material of the part, and the other is a cold contact which is provided apart from the part and serves as a reference temperature contact. The calorimeter according to any one of claims 1 to 3, wherein the calorimeter functions as a contact point. A calorific value calculating means for calculating a calorific value based on the temperature measured by the temperature measuring means;
The calorific value calculating means is newly provided when an initial value of the temperature measured by the temperature measuring means when the fuel gas is not flowing inside the pipe material and when the fuel gas is not flowing inside the pipe material. The amount of variation is calculated by comparing the temperature value measured by the temperature measurement means with respect to the temperature measured by the temperature measurement means when fuel gas is flowing inside the pipe. The calorific value according to any one of claims 1 to 4, wherein the calorific value is calculated in consideration of the fluctuation amount. A calorific value calculating means for calculating a calorific value based on the temperature measured by the temperature measuring means;
The calorific value calculation means is an average value of values excluding a maximum value and a minimum value among a plurality of temperature values measured by the temperature measurement means when fuel gas is circulating inside the pipe. The calorific value according to any one of claims 1 to 4, wherein the calorific value is calculated on the basis of the calorific value.