JP2015087165A - Calorimeter and calory measurement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a calorimeter and the like which is a gas calorimeter capable of continuously and accurately measuring gas calorie in a simple structure and a small size.SOLUTION: A calorimeter measuring calorie of gas continuously flowed in comprises: an oxidation catalyst which includes a heating element; a gas introduction pipe which introduces the gas to the vicinity of the oxidation catalyst; a heat storage which is arranged around the oxidation catalyst; a temperature measurement unit which measures the temperature of the heat storage; and a calculation unit which acquires calorie of the gas on the basis of the temperature measured by the temperature measurement unit, when the oxidation catalyst is heated by the heating element and the gas is introduced by the gas introduction pipe.

Description

  The present invention relates to a gas calorimetric technique, and more particularly to a small calorimeter or the like that can measure the calorific value of a gas continuously and with a relatively simple structure.

  Conventionally, various calorimeters are used for the purpose of measuring the amount of heat such as city gas.

  Such conventional calorimeters include the Junkers flowing water calorimeter method, which is a legal measurement method, a gas chromatograph method, a rapid response calorimeter (described in Patent Document 1 below), a gas density calorimeter, and the like. And a thermal conductivity calorimeter (described in Patent Document 2 below).

  Patent Document 3 below describes a measurement method using an oxidation catalyst. In this method, gas is passed through a heated catalyst to cause catalytic combustion, and the amount of heat is obtained from a temperature change or the like.

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

  However, the above-mentioned Junkers-type flowing water gas calorimeter method and gas chromatograph method have a problem that continuous measurement is impossible.

  Further, the rapid response calorimeter has a problem that the measured value drifts when used for a long time, and has a drawback that the apparatus is large.

  In addition, the above-mentioned gas density calorimeter and thermal conductivity calorimeter have the problem that the density and thermal conductivity cannot be distinguished between the air component and the combustible gas component, so the accuracy deteriorates when the air component is mixed. There is.

  Further, in the method and apparatus described in Patent Document 3, the measurement method and the apparatus therefor are comparatively used, such as a procedure in which a reference gas and a sample gas are alternately flowed, and a chamber for each gas is provided. There is a problem of being complicated.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a gas calorimeter that can measure the calorific value of a gas continuously and accurately, and has a relatively simple structure and a small calorimeter. It is.

  In order to achieve the above object, according to one aspect of the present invention, a calorimeter that measures the calorific value of a continuously flowing gas includes an oxidation catalyst including a heating element, and the gas in the vicinity of the oxidation catalyst. A gas introduction pipe that leads, a heat storage section provided around the oxidation catalyst, a temperature measurement section that measures the temperature of the heat storage section, and the heating element heats the oxidation catalyst, and gas is introduced through the gas introduction pipe A calculation unit that obtains the amount of heat of the gas based on the temperature measured by the temperature measurement unit.

  Furthermore, in the above-mentioned invention, one aspect is characterized in that the calculation unit obtains the amount of heat of the gas based on the amount of power applied to the heating element.

  In the above invention, another aspect further includes a reference oxidation catalyst having the same specifications as the oxidation catalyst, a reference heat storage unit provided around the reference oxidation catalyst, and a reference for measuring the temperature of the reference heat storage unit. A temperature measurement unit, and the calculation unit obtains the heat quantity of the gas based on the temperature measured by the reference temperature measurement unit.

  Furthermore, in the above invention, a preferable aspect thereof is that the heating element included in the oxidation catalyst is a first resistor, the heating element included in the reference oxidation catalyst is a second resistor, and The first resistor and the second resistor are connected in series, and the third resistor and the fourth resistor connected in series with each other are connected in parallel with the first resistor and the second resistor. An ammeter is provided between an output terminal between the first resistor and the second resistor and an output terminal between the third resistor and the fourth resistor; It is characterized by that.

  Furthermore, in the above-described invention, a preferable aspect thereof is further characterized in that an air pipe for guiding air to the oxidation catalyst is further provided.

  Furthermore, in the above-mentioned invention, one aspect is characterized in that a tip of the air pipe opens in the vicinity of the oxidation catalyst.

  In the above invention, another aspect is characterized in that a tip of the air pipe opens inside the gas introduction pipe.

  Moreover, in the above-described invention, one aspect is characterized in that the oxidation catalyst also serves as the heat storage section.

  Furthermore, in the above invention, a preferred aspect thereof is characterized in that the oxidation catalyst is formed of a porous body, and the gas introduction pipe extends to the vicinity of the heating element.

  Moreover, in the above-mentioned invention, one aspect is characterized in that the heat storage unit is configured by a thermoelectric element.

  In order to achieve the above object, another aspect of the present invention provides a calorimetric method for measuring a calorific value of a continuously flowing gas, an oxidation catalyst including a heating element, and the gas in the vicinity of the oxidation catalyst. A gas introduction pipe for guiding the gas, a heat storage part provided around the oxidation catalyst, and a temperature measurement part for measuring the temperature of the heat storage part, the heating element is heated by the heating element, and the gas introduction A gas is introduced through a tube, and the amount of heat of the gas is obtained based on the temperature measured by the temperature measuring unit.

  Further objects and features of the present invention will become apparent from the embodiments of the invention described below.

It is a block diagram which concerns on the example of embodiment of the calorimeter to which this invention is applied. 1 is a configuration diagram according to a first embodiment of a calorimeter 1. FIG. It is a block diagram which concerns on 3rd Example of the calorimeter 1. FIG. It is explanatory drawing of a deformation | transformation form. It is the figure which showed the deformation | transformation form. It is explanatory drawing of a deformation | transformation form.

  Embodiments of the present invention will be described below with reference to the drawings. However, such an embodiment does not limit the technical scope of the present invention. In the drawings, the same or similar elements are denoted by the same reference numerals or reference symbols.

  FIG. 1 is a configuration diagram according to an embodiment of a calorimeter to which the present invention is applied. A calorimeter 1 shown in FIG. 1 is a calorimeter to which the present invention is applied. As will be described in detail later, an oxidation catalyst (detection unit catalyst 35) including a heating element (detection unit heating element 36), and the oxidation catalyst A heat storage material (detection unit heat storage material 33, heat storage unit) provided so as to surround is provided, and the gas to be measured is blown into the vicinity of the oxidation catalyst heated to a predetermined temperature by the heating element to perform catalytic combustion, The amount of heat of gas is measured from the temperature of the heat storage material at the time. By using the calorimeter 1, the calorific value of the gas can be continuously measured with a relatively simple device.

  FIG. 1 shows a general functional configuration of the calorimeter 1. In this embodiment, the calorimeter 1 is installed in a city gas factory or house supply pipe (gas pipe in the figure) and continuously (as needed) measures the amount of heat of the gas flowing through the supply pipe. Assumes that.

  The gas flow rate measuring unit 2 is a part that measures the amount of gas introduced into the calorimeter 1 from the gas pipe. The detection unit 3 is a part where the above-described catalytic combustion is performed by the introduced gas, and a value for heat quantity measurement is detected, and the reference unit 4 does not introduce the gas, and the zero point for heat quantity measurement. It is a part that measures a value for performing correction, and is a part that is referred to in order to measure only the amount of heat generated by gas. The heating circuit unit 5 is an electric circuit for heating the oxidation catalyst provided in the detection unit 3 and the reference unit 4. In addition, the specific structure (structure) of the detection part 3, the reference part 4, and the heating circuit part 5 is mentioned later.

  The calculation unit 6 is a part that calculates the amount of heat of the gas from each measurement value detected by the gas flow rate measurement unit 2, the detection unit 3, and the reference unit 4. A specific method will be described later. The calculation unit 6 can be configured by a so-called microcomputer or the like, and includes a CPU, a RAM, a ROM, an ASIC, a display device, an input device, and the like (not shown). Further, a communication interface for communicating with an external device may be provided.

  FIG. 2 is a configuration diagram of the first calorimeter 1 according to the first embodiment. The calorimeter 1 can be embodied in several embodiments. First, a first example will be described with reference to FIG.

  As shown in FIG. 2, the gas flow rate measuring unit 2 is provided with a flow meter 21, and the flow rate of gas introduced into the calorimeter 1 from the gas pipe (the supply pipe) (for example, V liter / second) Measure continuously during measurement. The measured flow rate is transmitted to the calculation unit 6.

  The detection unit 3 is provided with a detection unit catalyst 35 including a detection unit heating element 36 therein. The detection unit catalyst 35 is, for example, an oxidation catalyst hardened in a spherical shape, and a Pt-based catalyst, a Pd-based catalyst, or the like can be used. The detection unit heating element 36 is an electric resistance (first resistor) and constitutes a part of an electric circuit (for example, a Wheatstone bridge circuit) of the heating circuit unit 5 described later. By applying electricity to the detection unit heating element 36, the detection unit catalyst 35 is heated.

  Further, as shown in FIG. 2, the detection unit 3 is provided with a detection unit heat storage material 33 so as to surround the detection unit catalyst 35 from above. This detection part heat storage material 33 is a part which stores the generated heat in order to indirectly grasp the amount of heat generated in the detection part catalyst 35 and its vicinity. For the detection part heat storage material 33, it is suitable to use a metal material having a high thermal conductivity such as aluminum. Moreover, the shape of the detection part heat storage material 33 is made into the shape in which the generated heat | fever is easy to conduct, such as a hollow hemisphere and the shape of a measuring bowl. Moreover, it is good also as a shape which covers the circumference | surroundings of the detection part catalyst 35 altogether.

  The detection unit thermocouple 34 (temperature measurement unit) measures the temperature of the detection unit heat storage material 33, is provided in the detection unit heat storage material 33, and the measured temperature is transmitted to the calculation unit 6.

  The gas introduction pipe 31 is a pipe for introducing the gas measured by the flow meter 21 into the vicinity (surrounding) of the detection section catalyst 35, and the gas branched from the gas pipe by the gas introduction pipe 31 is detected by the detection section catalyst 35. Guided to the space between the partial heat storage materials 33. It is preferable that the tip of the gas introduction pipe 31 is positioned so that the gas is blown onto the detection unit catalyst 35.

  The air pipe 32 (air pipe) is a pipe that blows in air for supplying oxygen for gas combustion. Like the gas introduction pipe 31, the tip thereof is a gap between the detection unit catalyst 35 and the detection unit heat storage material 33. It is provided so that it may be located in. Accordingly, air is blown around the detection unit catalyst 35. Although not shown, a blower or the like can be provided upstream of the air pipe 32.

  Next, as shown in FIG. 2, the reference portion 4 is provided with a reference portion catalyst 45 (reference oxidation catalyst) including a reference portion heating element 46 therein. The reference part heating element 46 and the reference part catalyst 45 have the same specifications as the detection part heating element 36 and the detection part catalyst 35. Moreover, the reference part heat storage material 43 (reference heat storage part) is provided so that the reference part catalyst 45 may be enclosed from the top, and it is comprised with the material and shape similar to the detection part heat storage material 33. FIG. However, there is no problem even if the specification is the same as or different from that of the detection unit heat storage material 33. Moreover, the reference part thermocouple 44 (reference temperature measurement part) is provided in the reference part heat storage material 43, and measures the temperature of the reference part heat storage material 43. The measured temperature is transmitted to the calculation unit 6.

  Next, the heating circuit unit 5 is provided with an electric circuit for causing a current to flow through the detection unit heating element 36 and the reference unit heating element 46 to generate heat. Here, as an example, the electric circuit constitutes a Wheatstone bridge circuit. As shown in FIG. 2, the electric circuit includes a bridge circuit to which a predetermined voltage is applied by a power source 51, and a detection unit as a first resistor connected in series is provided on one of the paths. A heating element 36 and a reference portion heating element 46 as a second resistor are provided, and a third resistor 53 and a fourth resistor 54 are connected in series to the other path connected in parallel with the heating element 36. .

  The resistance values of these resistors are the values between the bridges (the output terminals between the detection unit heating element 36 and the reference unit heating element 46) when no gas is introduced into the detection unit 3, that is, when the gas is not combusted. And between the output terminals between the third resistor and the fourth resistor). An ammeter 52 that measures the current flowing between the bridges is provided between the bridges, and the current value measured here is transmitted to the calculation unit 6.

  Next, a method for measuring the amount of heat in the first embodiment having such a configuration will be described. First, the power supply 51 of the heating circuit unit 5 is turned on, and the detection unit catalyst 35 is heated to a temperature range in which the detection unit catalyst 35 can be completely combusted by heat generation from the detection unit heating element 36, for example, 400 ° C. Thereafter, a substantially constant amount of gas (V liter / second is approximately constant) is continuously introduced from the gas pipe into the vicinity of the detection unit catalyst 35 via the flow meter 21 and the gas introduction pipe 31. The introduced gas is catalytically combusted by the heated detector catalyst 35 (oxidation catalyst) and air introduced from the air pipe 32, and is completely combusted.

  Due to the combustion, the temperature of the detection unit catalyst 35 and the vicinity thereof increases, and accordingly, the temperature of the detection unit heat storage material 33 also increases. After that, since the same amount of gas is continuously introduced, the combustion is continued. As a result, substantially constant combustion is continued, so that after a certain period of time has elapsed after the start of combustion, the states of the detection unit catalyst 35 and the detection unit heat storage material 33 become stable, and the temperatures of both become substantially constant. In this state, heat input to the detection unit heat storage material 33 and heat dissipation from the detection unit heat storage material 33 are balanced (heat input = heat dissipation).

  On the other hand, in the reference part 4, after the power is turned on, the reference part catalyst 45 is heated by the heat generated from the reference part heating element 46, and the temperature of the reference part catalyst 45 and the vicinity thereof rises. Accordingly, the temperature of the reference portion heat storage material 43 also increases. Since no gas is introduced into the reference portion 4, there is no temperature rise due to combustion, and the temperature of the reference portion heat storage material 43 becomes substantially constant after a certain time has elapsed after the power is turned on. In this state, heat input to the reference part heat storage material 43 and heat dissipation from the reference part heat storage material 43 are balanced (heat input = heat dissipation).

As described above, when the temperatures of the detection unit heat storage material 33 and the reference unit heat storage material 43 become substantially constant, the calculation unit 6 calculates the gas flow rate (V (liter / second)) transmitted from the flow meter 21 and the detection unit thermocouple. 34 based on the temperature (Td (° C.)) transmitted from 34 and the temperature (Tr (° C.)) transmitted from the reference portion thermocouple 44, using the following equation (1), the amount of heat of the introduced gas ( H1 (kJ / m ³ )) is obtained.

H1 = F1 (Wd × Td−Wr × Tr) / V (1)
In the above equation (1), Wd is the mass (g) (known) of the detection unit heat storage material 33, Wr is the mass (g) (known) of the reference unit heat storage material 43, and F1 is a predetermined constant. .

  The calculation unit 6 displays the calculated heat value on the display device and records it in the memory in the calorimeter 1. Note that instead of or in addition to that, the calculation unit 6 may transmit the calculated value of heat quantity to an external device.

  In the present calorimeter 1, such a calorific value is continuously measured at a predetermined frequency (for example, every second).

  In addition, said (1) Formula will be in the said steady state, and the heat input to the detection part heat storage material 33 and the reference part heat storage material 43 provided with the catalyst and heating element of the same specification (namely, heat dissipation from each heat storage material). Is based on the idea that the amount of heat released depends on the amount of heat that each heat storage material has at that time. In addition, the specific heat of the detection part heat storage material 33 and the reference part heat storage material 43 is known.

  Further, F1 is determined in advance by performing the same measurement using a reference gas with a known calorie and applying the measurement value obtained from the measurement to the above equation (1). Note that F1 may be determined not as a constant but as a function of temperature.

  Next, reliability confirmation and deterioration confirmation of the calorimeter 1 will be described. As described above, in the electric circuit of the heating circuit unit 5, the current value of the ammeter 52 is adjusted to zero when the gas is not combusted. As the temperature of the 1 resistor increases and the resistance value changes, the ammeter 52 detects the current value (the current value is not zero). Since the electric circuit is a Wheatstone bridge and the resistance values of the second resistor (reference portion heating element 46), the third resistor 53, and the fourth resistor 54 are known, the current value detected at this time point From this, the resistance value of the detection unit heating element 36 (first resistor) at this time is obtained.

  The resistance value of the resistor depends on its temperature, and the relationship can be determined in advance. Therefore, when the calorie of the gas is measured, the detection unit heating element 36 (first resistor) is detected from the current value detected by the ammeter 52. ) Temperature can be obtained. Further, the temperature of the reference portion heating element 46 (second resistor) having a known resistance value is also obtained.

  Accordingly, the temperature Td and Tr of the heat storage materials 33 and 43 measured by the thermocouples 34 and 44 described above, and the detection unit heating element 36 (first resistor) and the reference unit heating element 46 ( By comparing the temperature of the second resistor), the reliability of the temperature measurement by the thermocouples 34 and 44 can be checked.

  The confirmation of the reliability may be always performed by the calculation unit 6 at the same timing as the gas calorie measurement, or may be performed at a longer cycle.

  Further, in order to confirm the deterioration of the oxidation catalyst (in particular, the detection unit catalyst 35), the value of the ammeter 52 may be checked without periodically introducing gas. Thereby, the drift situation of the zero point can be grasped. If the current value detected by the ammeter 52 is not zero, it is considered that the zero point is drifting, and if the width is increasing or decreasing, it is assumed that the oxidation catalyst has deteriorated.

  Further, the catalyst and the heating element of the detection unit 3 and the reference unit 4 may be periodically exchanged (exchanged with each other), and the deterioration of the oxidation catalyst may be grasped from the change in the measurement result due to the exchange.

  Next, a second embodiment will be described. The calorimeter 1 of this embodiment is different from the first embodiment only in the heating circuit unit 5. The heating circuit unit 5 of the second embodiment does not have the Wheatstone bridge circuit described above, and simply supplies predetermined power to the detection unit 3 (detection unit heating element 36) and the reference unit 4 (reference unit heating element 46). It has an electric circuit. The detection part catalyst 35, the detection part heating element 36, the reference part catalyst 45, and the reference part heating element 46 have the same specifications as in the first embodiment.

  The measuring method is the same as that in the first embodiment. Note that reliability and deterioration cannot be confirmed using a Wheatstone bridge circuit. In the second embodiment, when no gas is introduced, the zero point is corrected and the deterioration of the oxidation catalyst is grasped from the measured values when the catalyst and the heating element of the detection unit 3 and the reference unit 4 are exchanged.

  Next, a third embodiment will be described. FIG. 3 is a configuration diagram according to the third embodiment of the calorimeter 1. As shown in FIG. 3, the calorimeter 1 of the third embodiment does not have the reference unit 4. The gas flow rate measurement unit 2 and the detection unit 3 have the same configuration as that of the first embodiment, and each unit has the same specifications.

  Moreover, although not shown in figure, the heating circuit part 5 is provided with the electric circuit which supplies predetermined electric power only to the detection part 3 (detection part heating element 36).

  The calorific value of the gas is measured as follows. First, a power source (not shown) of the heating circuit unit 5 is turned on, and the detection unit catalyst 35 is heated to a temperature range in which the detection unit catalyst 35 can be completely burned by heat generated from the detection unit heating element 36, for example, 400 ° C. Thereafter, a substantially constant amount of gas (V liter / second is approximately constant) is continuously introduced from the gas pipe into the vicinity of the detection unit catalyst 35 via the flow meter 21 and the gas introduction pipe 31. The introduced gas is catalytically combusted by the heated detector catalyst 35 (oxidation catalyst) and air introduced from the air pipe 32, and is completely combusted.

  Due to the combustion, the temperature of the detection unit catalyst 35 and the vicinity thereof increases, and accordingly, the temperature of the detection unit heat storage material 33 also increases. After that, since the same amount of gas is continuously introduced, the combustion is continued. As a result, substantially constant combustion is continued, so that after a certain period of time has elapsed after the start of combustion, the states of the detection unit catalyst 35 and the detection unit heat storage material 33 become stable, and the temperatures of both become substantially constant. In this state, heat input to the detection unit heat storage material 33 and heat dissipation from the detection unit heat storage material 33 are balanced (heat input = heat dissipation).

As described above, when the temperature of the detection unit heat storage material 33 becomes substantially constant, the calculation unit 6 transmits the gas flow rate (V (liter / second)) transmitted from the flow meter 21 and the temperature transmitted from the detection unit thermocouple 34. Based on (Td (° C.)) and the amount of electric power applied to the detector heating element 36 (Wi (kJ)), the following equation (2) is used to calculate the amount of heat of the introduced gas (H2 (kJ / m ^3). )).

H2 = F2 (Wd × Td) / V−Wi / V (2)
In the above equation (2), Wd is the mass (g) (known) of the detection unit heat storage material 33, and F2 is a predetermined constant. The applied power amount Wi is given from the heating circuit unit 5 to the calculation unit 6.

  The calculation unit 6 displays the calculated heat value on the display device and records it in the memory in the calorimeter 1. Note that instead of or in addition to that, the calculation unit 6 may transmit the calculated value of heat quantity to an external device.

  In the present calorimeter 1, such a calorific value is continuously measured at a predetermined frequency (for example, every second).

  It should be noted that the above formula (2) is completely obtained when the heat input to the detection unit heat storage material 33 in the steady state (that is, the heat release from each heat storage material) is introduced with the amount of electric power applied to the detection unit heating element 36. It corresponds to the amount of heat of the burned gas, and the heat release amount is based on the idea that the heat storage material depends on the amount of heat that the heat storage material has at that time. In addition, the specific heat of the detection part heat storage material 33 is known.

  Further, F2 is determined in advance by performing the same measurement using a reference gas with a known calorie, and applying the measurement value obtained from the measurement to the above equation (2). Note that F2 may be determined not as a constant but as a function of temperature.

  In addition, in the calorimeter 1 of 3rd Example, it measures without introduce | transducing gas regularly for zero point correction | amendment. When the output (heat amount H2) does not become zero by the measurement, correction is performed such as adding a constant term that makes the heat amount H2 zero in the above equation (2). The zero point correction process can be performed by the calculation unit 6.

  Although the first to third embodiments have been described above, the following modifications may be made in each embodiment.

  First, the air pipe 32 may not be provided. In this case, since the air necessary for gas combustion needs to be naturally introduced around the detection unit catalyst 35, the detection unit heat storage material 33 is configured to cover (enclose) all the detection unit catalyst 35. First, the shape is partially open. In the form in which the air pipe 32 is not provided, it is not necessary to provide the air pipe itself, a device such as a blower for sending air, and a hole of the detection part heat storage material 33 for passing the error pipe, and the structure (configuration) of the device. Can be simplified.

  As another form, the air pipe 32 may be joined to the gas introduction pipe 31. In other words, a tip portion (opening portion) from which air from the air pipe 32 is released may be provided inside the gas introduction pipe 31. In this case, the position of the merge is between the downstream side of the flow meter 21 and the tip (opening) of the gas introduction pipe 31. Furthermore, it is preferable that the position is between the downstream side of the flow meter 21 and the detection part heat storage material 33. By setting it as such a form, the gas and air mixed well beforehand are introduce | transduced around the detection part catalyst 35, and combustion can be made more perfect. Further, by performing the merging before reaching the detection part heat storage material 33, it is only necessary to provide one hole for passing the pipe through the detection part heat storage material 33, the structure can be simplified, and construction is easy. It becomes.

  Next, the detection unit catalyst 35 may also serve as the detection unit heat storage material 33. In other words, the detection unit catalyst 35 is enlarged and the detection unit heat storage material 33 is omitted. FIG. 4 is an explanatory diagram of the embodiment. In the modification, the detection unit catalyst 35 is provided with a detection unit thermocouple 34. In this case, if there is the reference part 4, the reference part catalyst 45 also serves as the reference part heat storage material 43, and the reference part catalyst 45 is provided with the reference part thermocouple 44.

  Furthermore, in this modified embodiment, the detection unit catalyst 35 is formed of a porous body, the gas introduction pipe 31 is inserted into the detection unit catalyst 35, and the tip from which the gas in the gas introduction pipe 31 is ejected is in the vicinity of the detection unit heating element 36. It may be configured to reach. FIG. 5 is a diagram showing the embodiment.

  Next, it is good also as a form which uses a thermoelectric element for the detection part heat storage material 33. FIG. FIG. 6 is an explanatory diagram of the embodiment. In this mode, as shown in FIG. 6, the detection unit thermocouple 34 is provided on the outer surface of the detection unit heat storage material 33 (thermoelectric element) and measures the temperature of the outside air. Since the power generation amount obtained by the thermoelectric element depends on the difference between the temperature of the thermoelectric element and the outside air temperature, the temperature of the detection unit heat storage material 33 (thermoelectric element) can be obtained by measuring the power generation amount and the outside air temperature. . In the said modification, the calculating part 6 uses the temperature of the detection part heat storage material 33 (thermoelectric element) calculated | required in this way for calculation of the gas calorie | heat amount mentioned above.

  The generated electric power is charged by a secondary battery or a capacitor and used in a measurement circuit or an arithmetic circuit of the calorimeter 1.

  As described above, in the calorimeter 1 according to the present embodiment, the calorific value of the gas can be obtained based on the temperature of the detection unit heat storage material 33 in a steady state, so that the calorific value can be continuously measured. In addition, the calorimeter 1 can have a relatively simple structure.

  Further, as in the third embodiment, without providing the reference unit 4, the amount of heat is obtained by using the amount of electric power applied to the oxidation catalyst, thereby further simplifying the structure and reducing the size of the device. Can do.

  In addition, by providing the reference unit 4 as in the first and second embodiments, a measurement result with zero point correction can be obtained, and measurement accuracy can be improved. Further, the deterioration diagnosis of the oxidation catalyst can be easily performed.

  Moreover, by providing the heating circuit part 5 with a Wheatstone bridge as in the first embodiment, it is possible to easily check the reliability of temperature measurement (thermocouple) and the deterioration of the oxidation catalyst.

  Also, by providing the air pipe 32, oxygen can be reliably supplied to the gas combustion region, complete gas combustion is achieved, and measurement accuracy can be improved.

  Furthermore, good combustion is achieved by opening the tip of the air tube 32 in the vicinity of the oxidation catalyst.

  Further, by opening the tip of the air pipe 32 inside the gas introduction pipe 31, gas and air mixed well in advance can be supplied around the oxidation catalyst, and combustion can be made more complete.

  Further, by adopting a configuration in which the oxidation catalyst also serves as the heat storage material, heat loss related to heat conduction from the oxidation catalyst to the heat storage material can be eliminated, and measurement with higher accuracy is possible.

  In addition, by forming the oxidation catalyst with a porous body and inserting the gas introduction pipe 31 therein, the gas can be surely completely burned.

  Moreover, by comprising a thermal storage element with a thermoelectric element, the generated electric power can be utilized for operation | movement of the calorimeter 1, and power consumption can be reduced.

  The protection scope of the present invention is not limited to the above-described embodiment, but covers the invention described in the claims and equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 Calorimeter, 2 Gas flow measurement part, 3 Detection part, 4 Reference part, 5 Heating circuit part, 6 Calculation part, 21 Flowmeter, 31 Gas introduction pipe, 32 Air pipe, 33 Detection part thermal storage material, 34 Detection part thermoelectric Pair, 35 sensing part catalyst, 36 sensing part heating element, 43 reference part heat storage material, 44 reference part thermocouple, 45 reference part catalyst, 46 reference part heating element, 51 power source, 52 ammeter, 53 third resistor, 54 4th resistor

Claims (11)

A calorimeter that measures the calorific value of continuously flowing gas,
An oxidation catalyst including a heating element;
A gas introduction pipe for guiding the gas in the vicinity of the oxidation catalyst;
A heat storage section provided around the oxidation catalyst;
A temperature measurement unit for measuring the temperature of the heat storage unit;
A calculation unit that obtains the amount of heat of the gas based on the temperature measured by the temperature measurement unit when the oxidation catalyst is heated by the heating element and the gas is introduced by the gas introduction pipe. A calorimeter characterized by In claim 1,
The said calculating part calculates | requires the calorie | heat amount of the said gas based on the electric energy applied to the said heating element. The calorimeter characterized by the above-mentioned. In claim 1, further comprising:
A reference oxidation catalyst having the same specifications as the oxidation catalyst;
A reference heat storage section provided around the reference oxidation catalyst;
A reference temperature measurement unit that measures the temperature of the reference heat storage unit,
The said calculating part calculates | requires the calorie | heat amount of the said gas based on the temperature measured by the said reference temperature measurement part. The calorimeter characterized by the above-mentioned. In claim 3, further:
The heating element included in the oxidation catalyst is a first resistor, the heating element included in the reference oxidation catalyst is a second resistor, and the first resistor and the second resistor are connected in series. A third resistor and a fourth resistor connected in series with each other have an electric circuit connected in parallel with the first resistor and the second resistor;
An ammeter is provided between an output terminal between the first resistor and the second resistor and an output terminal between the third resistor and the fourth resistor. Total. In any one of Claims 1 thru | or 4, Furthermore,
A calorimeter comprising an air pipe for guiding air to the oxidation catalyst. In claim 5,
A calorimeter characterized in that a tip of the air pipe opens in the vicinity of the oxidation catalyst. In claim 5,
A calorimeter characterized in that the tip of the air pipe opens inside the gas introduction pipe. In any one of Claims 1 thru | or 7,
The calorimeter, wherein the oxidation catalyst also serves as the heat storage unit. In claim 8,
The oxidation catalyst is composed of a porous body,
The gas introduction pipe extends to the vicinity of the heating element. In any one of Claims 1 thru | or 7,
The heat storage unit is composed of a thermoelectric element. A calorimetric method for measuring the calorific value of gas that flows continuously,
An oxidation catalyst including a heating element;
A gas introduction pipe for guiding the gas in the vicinity of the oxidation catalyst;
A heat storage section provided around the oxidation catalyst;
A temperature measuring unit for measuring the temperature of the heat storage unit, and
A calorific value measuring method characterized in that the oxidation catalyst is heated by the heating element, a gas is introduced by the gas introduction pipe, and the calorific value of the gas is obtained based on the temperature measured by the temperature measuring unit.