JP2019020376A - Analysis device - Google Patents

Abstract

To provide an analysis device capable of shortening time required for analysis by continuously analyzing different samples with excellent efficiency.SOLUTION: Disclosed is an analysis device 100 which includes: a container V in which a sample is housed; heating furnaces 1a, 1b in which the container V is placed: and an analyzer 2 for analyzing the gas to be analyzed which is generated from the sample combusted by being heated in the heating furnaces 1a, 1b. The analysis device is characterized in that a plurality of heating furnaces 1a, 1b are provided and a heating furnace selection mechanism 3 is included which selectively communicates one of heating furnaces with the analyzer 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an analyzer for analyzing elements such as carbon (C) and sulfur (S) contained in samples such as steel, non-ferrous metals, and ceramics.

In this type of analyzer, for example, as shown in Patent Document 1, a sample is put into a heating furnace and heated, and a combustion-supporting gas such as O ₂ necessary for combustion is supplied to the heating furnace to burn the sample. The gas generated thereby is analyzed by an analyzer such as NDIR.

JP-A 61-274259

  By the way, such a conventional analyzer has only one measurement heating furnace for burning a sample to generate a gas to be analyzed, and in order to continuously analyze a plurality of samples, In each case, it was necessary to take out the sample after combustion from the measurement furnace, weigh a new sample, and put it back into the measurement furnace. Furthermore, since it takes time until a new sample is introduced and burned to generate a gas to be analyzed, it is very inefficient.

  Accordingly, the present invention has been made to solve the above-described problems, and has as its main object to provide an analyzer that can efficiently analyze a plurality of samples.

  That is, the analyzer according to the present invention includes a container for storing a sample, a heating furnace in which the container is charged, and an analyzer for analyzing an analysis target gas generated from the sample heated and burned in the heating furnace. The analyzer is provided with a plurality of heating furnaces, and further includes a heating furnace selection mechanism for selectively communicating any one of the heating furnaces with the analyzer.

  With such a configuration, since there are multiple heating furnaces that can burn the sample and generate the analysis target gas, the sample is burned in one heating furnace and the analysis target gas is analyzed with the analyzer In the meantime, the sample gas is burned in another heating furnace, and the analysis target gas to be analyzed next can be prepared. The analysis of the next gas to be analyzed can be started immediately by connecting the heating furnace in which the gas to be analyzed has been prepared to the analyzer by the heating furnace selection mechanism. As a result, the analysis sample is taken out from the measurement heating furnace, and a new sample is weighed and put into the measurement heating furnace. Since the time required to occur can be omitted, a plurality of samples can be analyzed continuously and efficiently.

  As a specific aspect of the heating furnace selection mechanism of the analyzer of the present invention, a plurality of gas outlet channels, each of which has a leading end in communication with each heating furnace and a terminal in communication with the analyzer, There may be mentioned those provided with on-off valves that open and close respectively.

  As an aspect of the analyzer of the present invention, a plurality of heating furnaces into which a container containing a sample is simultaneously operated are heated, and only one heating furnace is communicated with the analyzer by the heating furnace selection mechanism. It is preferable.

In the analyzer of the present invention, it is preferable that an openable / closable gas discharge channel for discharging the gas flowing through the gas outlet channel is connected upstream of the on-off valve in the gas outlet channel.
With such a configuration, in a heating furnace that is not in communication with the analyzer, for example, when the container is baked, the generated gas can be exhausted without being retained in the heating furnace. Therefore, when the sample is burned and analyzed using the heating furnace after baking, measurement errors due to the gas generated by baking can be reduced.

  Conventionally, when measuring free carbon (free carbon) contained in a sample using this type of analyzer, the sample is burned over time at a low temperature of about 800 ° C. to 900 ° C. It is necessary to generate the gas to be analyzed. However, in this way, when combustion is performed at a low temperature over time, the amount of analysis target gas introduced into the analyzer per unit time decreases, and the signal intensity output from the analyzer becomes weak. There is a problem that the S / N ratio deteriorates. Furthermore, since the analysis takes a long time, even if the offset of the analyzer is corrected before the analysis, the deviation from the zero point of the baseline increases during the measurement, and the measurement accuracy There is a problem that gets worse.

  In order to solve such a problem, the furnace temperature of the heating furnace can be changed between a predetermined first temperature range and a second temperature range lower than the first temperature range, In a state where the furnace temperature of the heating furnace is in the second temperature range, after the sample is put into the heating furnace, the on-off valve in the gas outlet passage of the heating furnace is changed from the closed state to the opened state after a predetermined time has elapsed. What is necessary is just to comprise so that it may switch.

  If it is such a structure, only the analysis object gas originating in a free carbon can be generated from a sample by making the furnace temperature of a heating furnace into a 2nd temperature range. Then, such a gas to be analyzed is stored in the gas outlet channel for a predetermined time without being immediately introduced into the analyzer, and then the on-off valve of the gas outlet channel is opened, so that the stored target gas is collected. Can be introduced into the analyzer at once. Therefore, the amount of analysis target gas introduced into the analyzer per unit time is increased, the signal intensity output from the analyzer can be increased, and the S / N ratio can be improved. Furthermore, since the analysis can be performed in a relatively short time after the on-off valve is opened, the analysis can be performed at a stage where the deviation from the zero point of the analyzer baseline is relatively small. Measurement accuracy can be improved.

  Specific examples of the heating furnace include a furnace body that contains a container and an electrical resistor that generates heat by energization and heats the furnace body.

Conventionally, the piping member for guiding the analysis target gas derived from the heating furnace to the analyzer is set to a certain length so that the thermal influence of the heating furnace does not reach the analyzer. Moreover, in order to collect the dust discharged | emitted from a heating furnace, the dust filter is provided in the analyzer side of the said piping member.
However, in such a mechanism, since dust adheres to the piping member, it is necessary to clean and replace the piping member as well as the dust filter.
In order to solve this problem, a dust removing mechanism is continuously attached to a gas outlet provided in the heating furnace for leading the analysis target gas to the analyzer. What is necessary is just to set it as the structure to which the said piping member was attached.
The dust removal mechanism includes a filter that collects dust and a casing that holds the filter therein, and the casing circulates the gas to be analyzed in the horizontal direction and holds the filter. It is even more preferable if it has a horizontal tube portion that has a concave portion provided below the filter in the horizontal tube portion.

With such a configuration, since the dust removing mechanism is continuously attached to the gas outlet, that is, continuously to the heating furnace, the temperature of the dust removing mechanism itself can be kept high to some extent. Therefore, it is possible to prevent moisture from condensing in the dust removal mechanism and adhering to the SO ₂ which is one of the measurement objects dissolved therein, thereby preventing a reduction in measurement accuracy. Furthermore, since the casing is configured to form a concave portion below the dust filter in the horizontal pipe portion, the dust that has fallen after being collected by the filter is accommodated in the concave portion provided below. Therefore, dust can be easily cleaned.

  By the way, this type of analyzer is provided with a container outlet at the end of the furnace body of the heating furnace, and the container after the measurement of the sample is taken out from this container outlet and discarded into a trash can etc. The However, since the container after the sample measurement is very hot, it must be handled with care. In particular, when a container taken out from the container outlet is moved to a trash box or the like, a psychological burden on an operator who carries a high-temperature container is large. In addition, there is a user who places a high-temperature container after measurement in the vicinity of the container outlet and cools it because he dislikes careful handling of such a container, but the stability of the container is poor near the container outlet, A slight shake may cause the hot container to fall. In addition, the temperature of the portion of the furnace main body that is in contact with the furnace main body container may increase rapidly, and cracks may occur in the furnace main body due to thermal shock.

In order to solve such a problem, the heating furnace has a container outlet for taking out the container, and the container taken out from the container outlet is placed near the container outlet. What is necessary is just to further provide the base member for placing.
With such a configuration, since the container taken out from the container outlet can be immediately placed on the base member, the operator once puts the hot container on the base member before moving it to the trash can etc. It can be cooled and the subsequent handling of the container can be made relatively easy. Thereby, the psychological burden accompanying the operation | work which moves a container to a trash can etc. can be reduced.

The base member has a base body and a container placement portion provided on the base body, and the container placement portion is made of a material having a thermal conductivity equal to or lower than a predetermined value. Is preferred.
If it is such, since the heat conductivity of the container mounting part which contacts a container is small, the amount of heat which moves from a high temperature container to a container mounting part can be decreased, and the rapid temperature fall of a container can be reduced. It is possible to prevent the occurrence of cracking of the container due to thermal shock. In addition, it is possible to prevent a rapid increase in temperature of the container mounting portion itself and to prevent the container mounting portion from cracking due to thermal shock. Furthermore, since the amount of heat transferred from the container to the base body via the container mounting portion can be reduced, melting of the base body can be prevented.

The container mounting part has a plurality of point contact parts or line contact parts on the surface thereof, and is configured so that the container can be placed in point contact or line contact with the point contact part or line contact part. It is preferable that
If it is such, since the contact area of a container and a container mounting part can be made small, the quantity of the heat which moves to a container mounting part from a container can be decreased, and the crack of a container by the above-mentioned thermal shock, and container mounting The crack of the part can be prevented more effectively.

It is preferable that the said container mounting part is a thing removable from a base main body.
If it is such, even if a container mounting part becomes dirty as it is used, it can be replaced immediately.

Further speaking, the apparatus further includes a container lid that covers the container, and the base body is configured so that the container lid can be installed thereon, and the container lid disposed on the base body is used. It is preferable that the container mounting portion is formed.
If it is such, since it can be used also as a container mounting part by installing a container lid, which has been conventionally used as a consumable, on the base body, new parts can be used as the container mounting part. There is no need to manufacture, and the manufacturing cost can be reduced. Moreover, even if the container lid which comprises a container mounting part cracks, it is only necessary to replace | exchange with the container lid stored preliminarily.

The analysis method according to the present invention is a method in which a sample contained in a container is burned in a heating furnace, and an analysis target gas generated thereby is analyzed by an analyzer, and after the sample is put into the heating furnace And a step of switching an open / close valve that opens and closes the gas outlet passage for communicating the heating furnace and the analyzer from a closed state to an open state after a predetermined time has elapsed.
In such a configuration, the gas to be analyzed is accumulated in the gas outlet passage for a predetermined time without immediately introducing it into the analyzer, and then the gas outlet passage is opened and closed. The analyzed gas can be derived to the analyzer all at once. Therefore, the amount of analysis target gas introduced into the analyzer per unit time is increased, the signal intensity output from the analyzer can be increased, and the S / N ratio can be improved. Furthermore, since the analysis can be performed in a relatively short time after opening the on-off valve, the analysis can be performed at a stage where the deviation from the zero point of the analyzer baseline is relatively small. The measurement accuracy can be improved.

  According to the present invention configured as described above, it is possible to provide an analyzer that can efficiently analyze a plurality of samples.

It is a figure which shows typically the structure of the analyzer of this embodiment. It is sectional drawing which shows typically the structure of the heating furnace of the embodiment. It is sectional drawing which shows typically the structure of the 1st dust removal mechanism of the embodiment. It is a figure which shows an example of the output result by the analyzer of the same embodiment. It is a figure which shows typically the structure of the analyzer of deformation | transformation embodiment. It is sectional drawing which shows typically the structure of the heating furnace of deformation | transformation embodiment.

  Hereinafter, an embodiment of an analyzer according to the present invention will be described with reference to the drawings.

<Configuration of the analyzer 100>
The analyzer 100 of the present embodiment, for example, heats and burns a sample such as a metal, and analyzes elements such as carbon (C) and sulfur (S) contained in the sample from the gas generated thereby. is there.

  Specifically, as shown in FIG. 1, the analyzer 100 includes a container V for storing a sample, a first heating furnace 1a and a second heating furnace 1b into which the container V is charged, a first heating furnace 1a and a first heating furnace 1b. The first dust removing mechanism 6a and the second dust removing mechanism 6b provided immediately after each of the two heating furnaces 1b, the analyzer 2 for analyzing the gas to be analyzed generated by the combustion of the sample, the first heating furnace 1a and the first heating furnace 1b A heating furnace selection mechanism 3 for selectively communicating any one of the two heating furnaces 1b with the analyzer 2, and a combustion support gas supply mechanism 4 for supplying a combustion support gas into the first heating furnace 1a and the second heating furnace 1b. And a control unit 5 that controls the first heating furnace 1a, the second heating furnace 1b, the heating furnace selection mechanism 3, and the combustion support gas supply mechanism 4.

  Hereinafter, each part will be described. In the following description, among the constituent elements described in the drawings, a plurality of constituent elements having the same reference numeral and different only alphabetic characters have the same configuration (for example, the first heating furnace 1a and the second heating furnace 1b have the same configuration), the description thereof may be omitted.

  The container V can accommodate a sample in the inside, and is installed in the 1st heating furnace 1a or the 2nd heating furnace 1b. Specifically, it is a porcelain combustion boat.

Inside the first heating furnace 1a and the second heating furnace 1b, the container V that does not contain the sample is baked, or the container V that contains the sample is heated to burn the sample.
As shown in FIG. 1, the first heating furnace 1a and the second heating furnace 1b apply current to the furnace bodies 12a and 12b, the electric resistors 14a and 14b, and the electric resistors 14a and 14b, respectively. And a current control circuit 17 for performing the operation.

  Here, the details of the configuration of the first heating furnace 1a will be described with reference to FIG. Here, only the configuration of the first heating furnace 1a is shown as a representative, but the second heating furnace 1b also has the same configuration.

  The furnace body 12a is a tubular ceramic molded product, and can accommodate the container V inside. A lid 15a is provided at one end of the furnace body 12a, and the sample V can be moved in and out of the furnace body 12a by removing the lid 15a. At the other end of the furnace body 12a, a gas outlet 13a for leading the analysis target gas generated from the sample to the analyzer 2 is provided.

  An electric resistor 14a is provided around the furnace body 12a. The electrical resistor 14a generates heat when energized and heats the furnace body 12a.

  As shown in FIG. 2, a first dust removing mechanism 6a is attached to the gas outlet 13a of the first heating furnace 1a so as to be continuous with the gas outlet 13a.

The first dust removing mechanism 6a removes dust and the like contained in the analysis target gas. Specifically, as shown in FIG. 3, it has the 1st member 61a which collects dust, and the 2nd member 62a which accommodates the dust which fell without being collected by the 1st member 61a.
FIG. 3 shows a state where the first dust removing mechanism 6a is disassembled and separated into the first member 61a and the second member 62a. Thus, the 1st member 61a is comprised so that attachment or detachment with respect to the 2nd member 62a is possible. Each member will be described.

  The first member 61a includes a filter 612a for collecting dust and a flange 614a that holds the filter 612a and forms a flow path for the analysis target gas. The filter 612a of the present embodiment is a mesh-like sintered metal filter made of stainless steel, and has a substantially cylindrical shape having an axis in the horizontal direction. The flange 614a includes a disk-shaped member that is coaxial with the filter 612a, and a tube member that protrudes from the disk-shaped member toward the analyzer 2 side.

  The second member 62a includes a first horizontal pipe portion 622a connected to the gas outlet port 13a, and a second horizontal pipe portion 623a that circulates the gas to be analyzed in the horizontal direction and holds and holds the filter 612a inside. Have. Both the first horizontal tube portion 622a and the second horizontal tube portion 623a have a substantially cylindrical shape having an axis in the horizontal direction. The first horizontal tube portion 622a and the second horizontal tube portion 623a are provided continuously in the direction in which the analysis target gas flows, and function as a casing of the first dust removal mechanism 6a. An opening is formed in the end 626a on the analyzer 2 side of the second horizontal tube portion 623a, and the filter 612a of the first member 61a is fitted into the opening.

  In the second horizontal tube portion 623a, a recess 624a is provided below the filter 612a by the inner wall of the second horizontal tube portion 623a. For this reason, dust that has been collected by the filter 612a and then dropped can be collected in the recess 624a, so that dust can be easily cleaned.

  The first horizontal tube portion 622a and the second horizontal tube portion 623a are formed so as to be coaxial, so that the inner diameter of the second horizontal tube portion 623a is larger than the inner diameter of the first horizontal tube portion 622a. It is configured. Accordingly, a step 625a is formed at the connecting portion between the first horizontal tube portion 622a and the second horizontal tube portion 623a, and the step 625a forms the side wall of the recess 624a. Therefore, dust that has been collected and dropped by the filter 612a is more easily collected, and dust can be cleaned more easily.

An end portion 626a on the analyzer 2 side of the second horizontal tube portion 623a is formed in a taper shape such that an opening formed by the inner surface thereof gradually narrows toward the analyzer 2 side. Therefore, when the first member 61a is removed from the second member 62a and the inside of the second member 62a is cleaned, the dust is not easily caught on the inner wall of the second horizontal pipe portion 623a, so that the dust can be easily discharged.
Moreover, since the 1st member 61a is detachable with respect to the 2nd member 62a as mentioned above, the inner surface of both members can be easily cleaned by removing each member.

The gas analyzer 2 analyzes the gas to be analyzed generated in the first heating furnace 1a and the second heating furnace 1b, and obtains the content of each component contained in the sample. In this embodiment, for example, analysis is performed using a non-dispersive infrared absorption method (NDIR method). Specifically, the gas analyzer 2 has a non-dispersed infrared detector (not shown), and detects CO ₂ , CO, SO _{2 and the} like contained in the gas derived from the heating furnaces 1a and 1b. The content of carbon (C) or sulfur (S) contained in the sample is obtained. In the present embodiment, the gas analyzer 2 performs offset correction using a reference gas such as oxygen, detects the gas to be analyzed introduced from the gas inlet 21, and measures the signal intensity over time.

  The heating furnace selection mechanism 3 selectively communicates either the first heating furnace 1a or the second heating furnace 1b with the analyzer 2. Specifically, the first gas outlet channel 31a, the second gas outlet channel 31b, the on-off valve 32a for opening and closing the first gas outlet channel 31a, and the on-off valve 32b for opening and closing the second gas outlet channel 31b. And an analysis target gas introduction flow path 33.

  The first gas outlet channel 31a is for leading the analysis target gas from the first heating furnace 1a. The starting end is connected to the flange 614a of the first dust removing mechanism 6a, and is configured to communicate with the furnace body 12a of the first heating furnace 1a. Moreover, the terminal is connected to the on-off valve 32a, and is configured to communicate with the gas inlet 21 of the analyzer 2 through the on-off valve 32a. The second gas outlet channel 31b is configured similarly.

  The analysis target gas introduction flow path 33 introduces the analysis target gas derived from the first heating furnace 1a or the second heating furnace 1b into the analyzer 2. The starting end is connected to the on-off valves 32a and 32b, and is configured to communicate with the first heating furnace 1a and the second heating furnace 1b. The terminal is connected to the gas inlet 21 of the analyzer 2 so as to communicate with the analyzer 2.

  From the first gas outlet channel 31a, a first gas outlet channel 35a for discharging the gas flowing through the first gas outlet channel 31a is branched. An on-off valve 34a is provided on the first gas discharge channel 35a, and the gas in the first heating furnace 1a and the first gas outlet channel 31a is exhausted by opening the on-off valve 34a. be able to. The second gas discharge channel 35b is configured similarly.

  The support gas supply mechanism 4 supplies support gas into the first heating furnace 1a and the second heating furnace 1b. In the present embodiment, oxygen is used as the combustion support gas. Specifically, the combustion support gas supply mechanism 4 includes a combustion support gas supply source 41 and a combustion support gas supply channel 42.

  The combustion support gas supply source 41 is for sending combustion support gas into the combustion support gas supply passage 42, and specifically includes an oxygen cylinder, a regulator attached to the oxygen cylinder, and the like. The combustion support gas supply source 41 is configured to maintain a constant pressure equal to or higher than the atmospheric pressure in the combustion support gas supply channel 42.

  The support gas supply passage 42 is for supplying the support gas derived from the support gas supply source 41 into the first heating furnace 1a and the second heating furnace 1b. The start end of the support gas supply passage 42 is in communication with the support gas supply source 41, and the end is connected to the furnace bodies 12a and 12b of the first heating furnace 1a and the second heating furnace 1b, and the furnace body 12a, It is comprised so that it may communicate in 12b. The combustion support gas supply flow path 42 is branched at a branch point P, the first combustion support gas introduction flow path 43a for introducing the support combustion gas into the first heating furnace 1a, and the combustion support gas into the second heating furnace 1b. And the second combustion support gas introduction flow path 43b (that is, the combustion support gas introduction flow paths 43a and 43b are part of the combustion support gas supply flow path 42).

  The first combustion support gas introduction flow path 43a supplies combustion support gas to the first heating furnace 1a. The start end is connected to the branch point P and communicates with the combustion support gas supply source 41 via the combustion support gas supply flow path 42, and the end is connected to and communicates with the furnace body 12a of the first heating furnace 1a. Yes. An on-off valve 44a for opening and closing the first support gas introduction channel 43a is provided on the first support gas introduction channel 43a. The second supporting gas introduction flow path 43b is configured similarly.

  Furthermore, in this embodiment, for each heating furnace, a combustion control mechanism that controls the combustion of the sample by adjusting the flow rate of the supporting gas supplied from the supporting gas introduction passages 43a and 43b to the heating furnaces 1a and 1b. 7a and 7b are provided.

The combustion control mechanism 7a includes a bypass channel 71a that branches from the first support gas introduction channel 43a and communicates with the analyzer 2, and an opening degree adjusting unit that adjusts the opening degree of the bypass channel 71a. ing.
The end of the bypass channel 71a is connected to the first gas outlet channel 31a here, and the gas inlet 21 of the analyzer 2 is connected via the first gas outlet channel 31a and the analysis target gas inlet channel 33. It is comprised so that it may communicate with.
Here, the opening degree adjusting means is the flow rate adjusting valve 72a, and the opening degree can be continuously adjusted by a signal from the control unit 5.
The combustion control mechanism 7a is also provided with a heating means 73a configured to heat the combustion supporting gas flowing through the bypass passage 71a to the same temperature range as the heating furnace 1a. Here, the heating means 73a has a heater or the like attached around the bypass channel 71a.
The combustion control mechanism 7b is also configured similarly to the combustion control mechanism 7a.

  Furthermore, in this embodiment, one combustion support gas heating mechanism 8 for heating the combustion support gas supplied from the combustion support gas supply source 41 is provided for the plurality of heating furnaces 1a and 1b.

This combustion support gas heating mechanism 8 branches from the support combustion gas supply flow path 42 and communicates the branch flow path 81 communicating with the analyzer 2 and the combustion support gas flowing through the branch flow path 81 at the same temperature as the heating furnace. Heating means 82 configured to be heated to a range.
The branch channel 81 is connected at its starting end upstream of the branch point P in the combustion support gas supply channel 42 and communicates with the combustion support gas supply source 41 via the combustion support gas supply channel 42. Is configured to do. The end is connected to the analysis target gas introduction flow path 33 and is configured to communicate with the gas introduction port 21 of the analyzer 2 via the analysis target gas introduction path 33.
Here, the heating means 82 has a heater or the like attached around the branch flow path 81.

  The controller 5 controls the opening and closing of the on-off valves 32a, 32b, 34a, 34b, 44a, 44b, 72a, 72b, 83a and 83b, changes the flow path of the combustion support gas and the gas to be analyzed, and controls the current. The circuit 17 is controlled to adjust the current applied to the electric resistor. Structurally, it is a so-called computer circuit having a CPU, an internal memory, an I / O buffer circuit, an A / D converter, and the like. Then, by operating according to a control program stored in a predetermined area of the internal memory, the CPU and its peripheral devices operate together to exhibit the function as the control unit 5.

  Next, an example of a method for analyzing a sample using the analyzer 100 of the present embodiment will be described in detail. As will be described below, in the analysis of the sample using the analyzer 100 of the present embodiment, the sample is burned in the first heating furnace 1a (or the second heating furnace 1b), and the analysis target gas generated thereby is predetermined. Then, the gas to be analyzed is supplied to the analyzer 2 for analysis. On the other hand, the sample is burned in the second heating furnace 1b (or the first heating furnace 1a) while the analysis is performed in the first heating furnace 1a (or the second heating furnace 1b), and thereby generated. The gas to be analyzed is allowed to stay for a predetermined time, and is prepared so that the analysis in the second heating furnace 1b (or the first heating furnace 1a) can be started immediately. And after the analysis in the 1st heating furnace 1a (or 2nd heating furnace 1b) is complete | finished, the analyzer 2 is calibrated, Then, it is made to stay in the 2nd heating furnace 1b (or 1st heating furnace 1a). An analysis target gas is supplied to the analyzer 2 for analysis.

  Specifically, first, the operator operates an operation panel (not shown) attached to the analyzer 100 to perform an operation to heat the furnace so that the furnace temperature is within a predetermined first temperature range. Do. The control part 5 which detected the said operation starts the heating of the 1st heating furnace 1a and the 2nd heating furnace 1b.

Next, the operator sets the furnace temperature of the heating furnaces 1a and 1b to a first temperature range of 1300 ° C. or more and 1500 ° C. or less by a temperature monitor (not shown) that is attached to the analyzer 100 and displays the furnace temperature. After confirming that the heating furnace is closed, the lid of the heating furnace is opened, and the container containing the sample is put into the first heating furnace 1a.
The operator operates the operation panel to perform an operation to start burning the sample in the first heating furnace 1a. The control part 5 which detected the said operation changes the on-off valve 44a from a closed state to an open state. As a result, the combustion supporting gas is supplied into the first heating furnace 1a through the first combustion supporting gas introduction channel 43a, and the sample is combusted. The gas to be analyzed generated by the combustion stays in the first heating furnace 1a and the first gas outlet 31a.

Thereafter, after a predetermined set residence time has elapsed since the on-off valve 44a is in the open state, the control unit 5 changes the on-off valve 32a from the closed state to the open state. Then, the analysis target gas staying in the first heating furnace 1a and the first gas outlet 31a is introduced into the analyzer 2 and analysis is started.
Note that the set residence time may be a time longer than a time necessary for completely burning the sample, or may be a time shorter than that. That is, the analysis target gas may be introduced into the analyzer 2 after the sample is completely burned, or the analysis target gas may be introduced into the analyzer 2 while the sample is burned.

After a predetermined time required for analysis has elapsed since the on-off valve 32a is in the open state, the control unit 5 changes the on-off valves 32a and 44a from the open state to the closed state. Then, the supply of the combustion support gas into the first heating furnace 1a is interrupted, and the combustion and analysis of the sample are completed.
The predetermined analysis required time is a time after the on-off valve 32a is opened, and may be a time specified in advance by the operator (for example, 60 seconds). Alternatively, it is the time after the on-off valve 32a is in the open state, and it takes for the signal intensity output from the analyzer 2 to fall below a predetermined peak intensity (for example, 1/100 or less). It may be time.

In this way, the combustion of the sample in the first heating furnace 1a and the analysis of the gas to be analyzed are performed. During this time, the preparatory operation for the analysis of the next sample can be performed in the second heating furnace 1b. Specifically, the container containing the sample is put into the second heating furnace 1b, and an operation for starting the combustion of the sample in the second heating furnace 1b is performed. The control unit 5 that has detected the operation changes the open / close valve 44b from the closed state to the open state. As a result, the combustion supporting gas is supplied into the second heating furnace 1b through the second combustion supporting gas introduction channel 43b, and the sample is combusted. The gas to be analyzed generated by the combustion stays in the second heating furnace 1b and the second gas outlet 31b. After the analysis in the first heating furnace 1a is completed and the on-off valve 32a is changed from the open state to the closed state, an operation for performing the analysis in the second heating furnace 1b is performed. The control unit 5 that has detected the operation changes the open / close valve 32b from the closed state to the open state, and the analysis target gas retained in the second heating furnace 1b is supplied to the analyzer 2 and the analysis is started.
After that, the preparation operation for the analysis of the next sample can be performed in the first heating furnace 1a as described above.
That is, according to the analysis apparatus 100 of the present embodiment, while the sample is analyzed in one heating furnace 1a (or 1b), the sample is burned in the other heating furnace 1b (or 1a) and analyzed. Can be prepared for.

Next, the calibration operation of the analyzer 2 of the analyzer 100 will be described.
In this embodiment, the analyzer 2 is always automatically calibrated immediately before the analysis in the heating furnaces 1a and 1b. For this calibration, the branch channel 81 is used.

This will be described in detail below. Immediately before the gas to be analyzed flows through the analyzer 2, the supporting gas introduction opening / closing valves 44a, 44b to the heating furnaces 1a, 1b are closed (therefore, the supporting gas introduction opening / closing valves 44a, 44b are closed). The on-off valve 83 is opened, and all of the combustion support gas flows through the branch flow path 81 and is introduced into the analyzer 2. At this time, the heating means 82 is also operated, and the combustion supporting gas is heated to the first temperature range when passing through the heating means 82.
As described above, the analyzer 2 is calibrated, more specifically, the zero point calibration is performed in a state where only the combustion supporting gas once heated is introduced into the analyzer 2.
The above is the calibration operation.

Next, the operation of the analyzer 100 when the sample is deflagration is described. In the description of the operation, one heating furnace 1a (or 1b) in which the sample is accommodated is in an operating state, and the combustion supporting gas to the other heating furnace 1b (or 1a) used for empty baking is not changed. The supply is in a stopped state, and it is assumed that the supply of combustion supporting gas to the branch flow path 81 is in a stopped state. That is, it is assumed that the supporting gas introduction opening / closing valve 44b (or 44a) and the opening / closing valve 83 are closed.
In the case of a deflagration sample, the operator operates the operation panel to reduce the flow rate of the supporting gas introduced into the heating furnace 1a (or 1b) containing the sample as compared with the normal sample. Set up. The control unit 5 detects this and controls the flow rate adjusting valve 72a (or 72b). Since the combustion support gas is divided into the heating furnace 1a (or 1b) and the bypass flow path 71a (or 71b), the flow rate adjusting valve 72a (or 72b) is operated in the opening direction to enter the bypass flow path 71a (or 71b). By increasing the flow rate of the flowing combustion support gas, the flow rate of the support gas supplied to the heating furnace 1a (or 1b) is decreased.
After the flow rate adjustment valve 72a (or 72b) is set in this way, the supporting gas introduction opening / closing valve 44a (or 44b) of the heating furnace 1a (or 1b) to be analyzed is opened, and the heating furnace 1a (or Alternatively, the combustion supporting gas flows in 1b) and the sample starts to burn.

Thus, the combustion of the sample is suppressed by the decrease in the flow rate of the combustion-supporting gas, and even the deflagration sample does not burn suddenly or as a result, explode.
Thereafter, as described above, after the predetermined set residence time has elapsed, the combustion support gas outlet opening / closing valve 32a (or 32b) of the heating furnace 1a (or 1b) is opened, and the analysis target gas is introduced into the analyzer 2. Analyzed.
Since the combustion support gas also functions as a carrier gas for sending the analysis target gas from the heating furnace 1a (or 1b) to the analyzer 2, the controller 5 controls the flow rate adjusting valve 72a (or 72b) after the set residence time has elapsed. ) Is controlled to increase the flow rate of the combustion support gas to the heating furnace 1a (or 1b), and the transfer time of the gas to be analyzed to the analyzer 2 is shortened.

  Here, the combustion supporting gas flowing through the bypass passage 71a (or 71b) is heated to the same temperature range as the heating furnace 1a (or 1b) by the heating means 73a (or 73b), and the bypass passage 71a (or 71b) is heated. ) And other impurities such as HC in the combustion support gas flowing in the same manner in the heating furnace 1a (or 1b). Thereby, in the analyzer 2 which performed the zero point calibration as described above, no measurement error is generated.

  According to the analysis apparatus 100 according to the present embodiment configured as described above, there are two heating furnaces, the first heating furnace 1a and the second heating furnace 1b, which can burn the sample and generate the analysis target gas. Therefore, while the sample is burned in one heating furnace 1a (or 1b) and the analysis target gas is analyzed, the sample is burned in the other heating furnace 1b (or 1a) and then analyzed. The gas to be analyzed can be prepared. The heating furnace selection mechanism 3 allows the heating furnace 1b (or 1a) in which the analysis target gas has been prepared to communicate with the analyzer 2 so that the analysis of the next analysis target gas can be started immediately. As a result, the analysis sample is taken out from the measurement heating furnace, and a new sample is weighed and put into the measurement heating furnace. Since the time required to occur can be omitted, a plurality of samples can be analyzed continuously and efficiently.

  Further, the analyzer 100 according to the present embodiment is an openable and closable gas for discharging the gas flowing in the gas outlet channels 31a and 31b upstream of the on-off valves 32a and 32b in the gas outlet channels 31a and 31b. Since the discharge flow paths 35a and 35b are connected, in the heating furnace not communicating with the analyzer 2, for example, the gas generated when the container is baked can be exhausted without staying in the heating furnace. it can. Therefore, when the sample is burned and analyzed using the heating furnace after baking, measurement errors due to the gas generated by baking can be reduced.

Moreover, since the dust removal mechanisms 6a and 6b are attached to the analyzer 100 of the present embodiment so as to be continuous with the gas outlets 13a and 13b of the heating furnaces 1a and 1b, the temperature of the dust removal mechanisms 6a and 6b itself is controlled. It can be kept high to some extent. For this reason, moisture condenses in the dust removal mechanisms 6a and 6b, and SO _{2 as} one of the measurement objects dissolves therein, so that the amount of SO ₂ in the analysis target gas changes and the measurement accuracy decreases. Can be suppressed.

Furthermore, according to this embodiment, the following effects can also be obtained.
Even if the sample put into the heating furnace is explosive, the combustion can be suppressed by reducing the flow rate of the supporting gas, and the sample can be prevented from being scattered by the explosion. This can contribute to improvement of measurement accuracy and prevention of occurrence of defects due to remaining samples. In addition, by suppressing combustion, fluctuations in the amount of analysis target gas introduced into the analyzer per hour can be moderated, so that the response of the analyzer can follow sufficiently and measurement errors are reduced. can do.
On the other hand, in the case of a sample that does not have deflagration property, since the combustion support gas can be supplied as usual by adjusting the flow rate of the combustion support gas, the measurement time does not become unnecessarily long.
Furthermore, since the combustion support gas after heating is supplied to the analyzer 2 at the time of calibration of the analyzer 2, the impurities in the support gas are burned in the same manner as at the time of analysis even at the time of calibration. Even if the substance is sensitive to 2, the measurement error due to combustion impurities can be canceled by setting the output value of the analyzer 2 at the time of calibration to the zero point. In addition, since it is only necessary to add a mechanism for heating the combustion-supporting gas, the price and size do not increase greatly.

<Other embodiments>
The present invention is not limited to the embodiment described above.

  In the analysis method using the analyzer 100 described above, the combustion of the sample is started with all the open / close valves 32 closed, and then the open / close valve 32 is opened to be introduced into the analyzer 2 into the analysis target gas. Although it was. It is not limited to this. The sample gas may be started to burn while the on-off valve 32 is in the open state, and the analysis target gas may be immediately introduced into the analyzer 2.

  In the analysis method using the analysis apparatus 100 described above, the analysis generated by burning the sample in the other heating furnace 1b (or 1a) while analyzing the sample in one heating furnace 1a (or 1b). Although the target gas can be retained to prepare for analysis, the present invention is not limited to this. In another embodiment, while the sample is analyzed in one heating furnace 1a (or 1b), baking for accommodating the sample in the other heating furnace 1b (or 1a) may be performed.

  Specifically, while analysis is being performed in the first heating furnace 1a, an empty container V is installed in the second heating furnace 1b, and the operator operates the operation panel so that the baking is performed in the second heating furnace 1b. The operation to start is performed. The controller 5 that has detected this changes the on-off valves 34b and 44b from the closed state to the open state. As a result, the combustion supporting gas is supplied into the first heating furnace 1b through the second combustion supporting gas introduction flow path 43b, the container V is baked, and gas derived from impurities adhering to the container is generated. To do. The gas is exhausted through the second gas outlet channel 31b and the second gas discharge channel 35b.

In the analysis method using the analysis apparatus 100 of the above-described embodiment, the sample is burned and analyzed in a state where the temperature in the furnaces of the heating furnaces 1a and 1b is in the first temperature range of 1300 ° C. or more and 1500 ° C. or less. However, it is not limited to this.
In the analysis apparatus 100 according to another embodiment, the in-furnace temperature of the heating furnaces 1a and 1b is lower than the first temperature range, for example, in a predetermined second temperature range of 800 ° C. or more and 900 ° C. or less. An analysis may be performed.
By using the furnace temperatures of the heating furnaces 1a and 1b in such a second temperature range, only the gas to be analyzed derived from free carbon contained in the sample can be analyzed by the analyzer 2. .

When free carbon is analyzed in a state where the furnace temperature in the heating furnace is in the second temperature range, the time for burning the sample and retaining the analysis target gas in the gas outlet pipe 31 is the time for retaining the normal sample. Longer than. By doing in this way, the quantity of the analysis object gas derived | led-out to the analyzer 2 per unit time can be increased, and S / N ratio can be improved. Therefore, free carbon can be analyzed with high accuracy.
In the case of measuring free carbon with such a configuration, it is preferable to switch the on-off valve from the closed state to the open state within 10 minutes from the start of the combustion of the sample from the viewpoint of improving the efficiency of the analysis.

FIG. 4 shows an example of a change in signal intensity-time when a sample is burned in a state where the furnace temperature of the heating furnace is in the second temperature range and the analysis target gas derived from free carbon is analyzed. Is.
FIG. 4A shows an output result obtained by deriving the generated analysis target gas to the analyzer 2 without staying upstream of the on-off valve 32. On the other hand, FIG. 4B shows that the generated gas to be analyzed is not immediately led to the analyzer 2 but stays upstream of the on-off valve 32, and after about 300 seconds from the start of combustion, the on-off valve 32 is retained. Is an output result obtained by deriving the analysis target gas to the analyzer 2 in the open state. Comparing (a) and (b) in FIG. 4, the generated signal gas is retained without being immediately led to the analyzer 2, thereby increasing the signal strength and improving the S / N ratio. It can be seen that the measurement accuracy for free carbon is improved.

  In the embodiment, the dust removing mechanism is configured such that the first horizontal tube portion and the second horizontal tube portion are coaxial, and the inner diameter of the second horizontal tube portion is larger than the inner diameter of the first horizontal tube portion. However, it is not limited to this. As long as a concave portion can be formed below the filter 62, the second horizontal pipe portion may have another shape. For example, the second horizontal tube portion may be formed with the concave portion 19 only on the lower side of the filter 62 and may be connected to the first horizontal tube portion flush with other portions.

  The analysis apparatus 100 of the above embodiment includes the two heating furnaces of the first heating furnace 1a and the second heating furnace 1b, but may include a larger number of heating furnaces. Even in such a case, the above-described effects can be obtained by providing the selection mechanism 3 that selectively connects each heating furnace to the analyzer 2.

  The analyzer 100 according to another embodiment may have a configuration in which the supporting gas heating mechanism 8 is not provided, a gas purifier is provided, and hydrocarbons in the supporting gas are removed by the gas purifier. In this case, the combustion control mechanisms 7a and 7b may not be provided with the heating means 73a and 73b.

  Although the analyzer 100 of the above embodiment supplies combustion-supporting gas such as oxygen into the heating furnace, it is not limited to this.

  The analysis apparatus 100 according to the embodiment includes both the first heating furnace 1a and the second heating furnace 1b including a furnace body that accommodates a container, and an electric resistor that generates heat when energized and heats the furnace body. Although there was, it is not limited to this. Except for the aspect in which the dust removal mechanism is provided immediately after the gas outlet of the heating furnace, a type of furnace called a high-frequency heating furnace may be used as the heating furnace.

  In the above-described embodiment, when the sample is detonable, after the sample has started to burn and a predetermined time has elapsed, the flow rate adjustment valve 72a (or 72b) is operated in the closing direction to bypass the bypass channel 71a (or The flow rate of the combustion support gas supplied to the heating furnace 1a (or 1b) may be increased by decreasing the flow rate of the combustion support gas flowing to 71b). Thereby, combustion of the sample is promoted, and the time required for analysis can be shortened.

In the above embodiment, the heating means 82 heats the combustion support gas by heat from a heater or the like attached to the outer peripheral portion of the branch flow path 81, but is not limited to this. In another embodiment, the heating means 82 heats the combustion supporting gas flowing in the branch flow path 81 using heat generated from the electric resistor 14a (or 14b) of the heating furnace 1a (or 1b). May be. Such a configuration is obtained by, for example, passing a part of the branch flow path 81 in the vicinity of the electrical resistor 14a (or 14b) and inside the heat insulating material covering the electrical resistor 14a (or 14b). Can be realized. With such a configuration, it is not necessary to provide a separate heater for heating the branch flow path 81, so that the price and size can be further reduced.
Similarly, the heating means 73a and 73b may be configured to heat the combustion-supporting gas flowing in the bypass passages 71a and 71b with heat generated from the electric resistors 14a and 14b included in the heating furnaces 1a and 1b.

  The heating furnace selection mechanism 3 of the above embodiment includes the on-off valves 32a and 32b that are two-way valves for opening and closing the flow paths on the first gas lead-out path 31a and the second gas lead-out path 31b, respectively. However, it is not limited to this. In other embodiment, the structure provided with the three-way valve which opens and closes each of the 1st gas extraction path 31a and the 2nd gas extraction path 31b may be sufficient.

  In addition, as shown in FIG. 5, in the analysis apparatus 100 of another embodiment, the bypass flow paths of the combustion control mechanism 7 a are provided in parallel, and a plurality of branch bypass flow paths 731 a to 733 a each having a predetermined resistance are provided. It may be branched. The branch bypass flow paths 731a to 733a have different resistances, and may be configured by resistors such as capillary tubes having different tube diameters and lengths.

In this embodiment, the opening degree adjusting means includes on-off valves 741a to 743a provided in the branch bypass flow paths 731a to 733a, respectively. These can be opened and closed by a signal from the control unit 5. By adjusting the open / close state of each of the open / close valves 741a to 743a, the flow rate of the combustion support gas supplied to the first heating furnace 1a can be adjusted more finely in a plurality of stages.
The combustion control mechanism 7b may have the same configuration.

  In the above-described embodiment, the bypass channels 71a and 71b are connected at the ends to the gas outlet channels 31a and 31b. However, the present invention is not limited to this. In other embodiments, the ends of the bypass channels 71a and 71b are opened to the outside without being connected to the gas outlet channels 31a and 31b, and the combustion supporting gas flowing through the bypass channels 71a and 71b is released to the outside. It may be done. However, in this case, the gas flow rate flowing through the analyzer 2 is not substantially constant.

  As shown in FIG. 6, the analyzer 100 according to another embodiment may further include a base member 9 provided in the vicinity of the container outlet 16a.

  The base member 9 is for placing a container taken out from the container outlet 16a thereon, and is provided so as to extend from directly below the container outlet 16a to the hand side. Structurally, it includes a base body 91 and a container mounting portion 92 provided on the base body 91.

The base body 91 is for supporting and holding the container mounting portion 92 at an appropriate height, and is composed of a top plate member 91a and a leg member 91b. The top plate member 91a is a plate-shaped member having a flat upper surface, and is configured so that the container mounting portion 92 can be installed on the upper surface.
In addition, as shown in FIG. 6, this stand main body 91 may be provided separately from the 1st heating furnace 1a, or may be attached to the housing | casing of the 1st heating furnace 1a.

The container placing portion 92 is in direct contact with the placed container V and is detachably provided on the base body 91. The container mounting portion 92 is made of a material having a thermal conductivity equal to or lower than a predetermined value, and here, ceramics (a compound of aluminum oxide and silicon dioxide (mullite)) is used as such a material. . The material which comprises the container mounting part 92 is not restricted to this, For example, you may use what is selected from materials with big heat capacity, such as glass and a brick. From the viewpoint of reducing heat transfer from the container V to the container mounting portion 92 and preventing cracking of the container V, if the thermal conductivity is equal to or lower than the thermal conductivity of the material of the top plate member, for example, about 400 W / It is preferably mK or less.
In addition, as for this container mounting part 92, the whole may be comprised from the material of the same quality, and the part which contacts the container V and the part other than that may be comprised from the different material.

  Specifically, the container mounting portion 92 is configured by providing a plurality of semi-cylindrical members 92 a on the top surface of the top plate member 91 a of the base body 91. Each semi-cylindrical member 92a is disposed on the top surface of the top plate member 91a so that the arc side faces upward, and the surface of the container mounting portion 92 has a wave shape having a plurality of top portions 92b in this way. It is an eggplant. The container mounting portion 92 is configured so that the container V can be placed thereon by making point contact or line contact with the top portion 92b instead of making the bottom surface of the container V contact the entire surface.

  In this embodiment, the height position of the top portion 92b is configured to be substantially the same as the height position of the bottom surface of the furnace body 12a. Therefore, when the container V is pulled out from the container outlet 16a and transferred onto the container mounting portion 92, there is almost no step between the bottom surface of the furnace body 12a and the top portion 92b, so that a large impact is applied to the container V. And can be transferred smoothly.

  In this embodiment, as the semi-cylindrical member 92a, a container lid for covering the container V is used when analyzing an element such as sulfur contained in a material that is easily scattered during combustion.

  The container mounting portion 92 described above uses a container lid as the semi-cylindrical member 92a, but may be configured using a dedicated member as the container mounting portion. The shape of such a member is not limited to a semi-cylindrical shape, but may be a hemispherical shape or a cross-sectional shape that is triangular, trapezoidal, or rectangular.

If it is the structure which has such a base member 9, since the container V picked out from the container outlet 16a can be mounted on the base member 9 immediately, an operator puts the high temperature container V after a measurement into a trash can etc. Before being moved to the position, it can be once placed on the base member 9 to be cooled, and the subsequent handling of the container V can be made relatively easy. Thereby, the psychological burden accompanying the operation | work which moves the container V to a trash can etc. can be reduced.
Moreover, since the container mounting part 92 is comprised from the mullite which is a material with comparatively small heat conductivity, the quantity of heat which moves to the container mounting part 92 from the high temperature container V can be decreased, and the container V Can be prevented, and the occurrence of cracks in the container V due to thermal shock can be prevented. In addition, it is possible to prevent a rapid temperature rise of the container mounting portion 92 itself, and to prevent the container mounting portion 92 from cracking due to thermal shock. Furthermore, since the amount of heat that moves from the container V to the base body 91 via the container mounting portion 92 can be reduced, melting of the base body 91 can be prevented.
Moreover, since the container mounting part 92 can place the container V on it by making point contact or line contact instead of making the bottom face of the container V contact the whole surface, the container V and the container mounting part 92 The contact area can be reduced, the amount of heat transferred from the container V to the container mounting portion 92 can be further reduced, and the cracking of the container V and the cracking of the container mounting portion 92 due to thermal shock can be more effectively prevented.
Furthermore, since the container mounting part 92 is removable from the base main body 91, even if the container mounting part 92 becomes dirty as it is used, it can be replaced immediately.
And since the container lid used conventionally as a consumable is used as this container mounting part 92, it is not necessary to manufacture a new component as the container mounting part 92, and can reduce manufacturing cost. . In addition, even if the container lid constituting the container placement portion 92 is broken, it is only necessary to replace the container lid stored in advance.

  In addition, the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications are possible without departing from the spirit of the present invention, including a combination of parts of the illustrated embodiments as appropriate.

DESCRIPTION OF SYMBOLS 100 ... Analytical apparatus 1 ... Heating furnace 1a ... 1st heating furnace 1b ... 2nd heating furnace 2 ... Analyzer 3 ... Heating furnace selection mechanism 7 ... Combustion control mechanism 8・ ・ ・ Supporting gas heating mechanism V ・ ・ ・ Container

Claims (10)

An analyzer comprising a container for storing a sample, a heating furnace into which the container is charged, and an analyzer for analyzing an analysis target gas generated from the sample heated and burned in the heating furnace,
An analyzer comprising a plurality of the heating furnaces and a heating furnace selection mechanism for selectively communicating any one of the heating furnaces with the analyzer. The furnace selection mechanism is
A plurality of gas outlet channels each having a leading end communicating with each heating furnace and a terminating end communicating with the analyzer;
The analyzer according to claim 1, further comprising an on-off valve that opens and closes each of the gas outlet channels.   The heating furnace in which a plurality of heating furnaces in which a container containing a sample is put is simultaneously operated, and only one heating furnace is communicated with the analyzer by the heating furnace selection mechanism. Analysis equipment.   The analyzer according to claim 2, wherein an openable and closable gas discharge channel for discharging gas flowing through the gas lead-out channel is connected upstream of the on-off valve in the gas lead-out channel. The furnace temperature of the heating furnace can be changed between a predetermined first temperature range and a second temperature range lower than the first temperature range,
In a state where the temperature in the furnace is in the second temperature range, after the sample is put into the heating furnace, the on-off valve in the gas outlet passage of the heating furnace is switched from the closed state to the open state after a predetermined time has elapsed. The analyzer according to any one of claims 1 to 4, wherein the analyzer is characterized.   The analyzer according to any one of claims 1 to 5, wherein the heating furnace includes a furnace body that accommodates a container, and an electric resistor that generates heat by energization and heats the furnace body. The heating furnace has a gas outlet for leading the analysis target gas to an analyzer,
Further comprising a dust removal mechanism attached to the gas outlet to be continuous;
The dust removing mechanism includes a filter that collects dust and a casing that holds the filter inside;
7. The casing according to claim 1, wherein the casing has a horizontal pipe part that circulates the gas to be analyzed in the horizontal direction and holds the filter, and a recess is provided below the filter in the horizontal pipe part. Or the analytical device described. The heating furnace has a container outlet for taking out the container,
The analyzer according to claim 1, further comprising a base member for placing the container taken out from the container outlet in the vicinity of the container outlet. The pedestal member has a pedestal main body, and a container placement portion provided on the pedestal main body,
The analyzer according to claim 8, wherein the container mounting portion is made of a material having a thermal conductivity equal to or less than a predetermined value. An analysis method in which a sample contained in a container is burned in a heating furnace, and an analysis target gas generated thereby is analyzed by an analyzer,
A step of switching an open / close valve that opens and closes a gas outlet passage for communicating the heating furnace and the analyzer from a closed state to an open state after a predetermined time has elapsed after the sample has been put into the heating furnace;
Analytical methods including: