JP2505454Y2 - Sampling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION {Industrial Application Field} The present invention relates to a sampling device for measuring a specific substance among combustible unburned substances present in combustion exhaust gas of an internal combustion engine, a boiler or the like.

<< Conventional Technology >> At present, the mechanism of combustion of internal combustion engines and boilers has not been clarified. Therefore, in the study of such a mechanism, a method of measuring combustion conditions (air-fuel ratio, temperature, pressure, etc.) and gas components / concentrations in the burned gas and analyzing them comprehensively from experimental data and the like is used.

However, in order to more accurately grasp the combustion state, it is necessary to measure particularly high-boiling flammable unburned substances present in the combustion exhaust gas.

On the other hand, such substances have various types and concentrations, and are difficult to measure because they are gaseous or liquid.

Therefore, at present, for example, the concentration of a substance adsorbed on a specific substance is measured, or the concentration of a substance that forms dew at a certain temperature or less is measured. It is extracted and its concentration is measured. Even in that case, it is difficult to measure continuously, and it is necessary to perform batch analysis by hand sampling or
Or, the present condition is that only the gaseous substances that are a part of them are measured by the FIA method as total hydrocarbons.

The present invention is intended to solve the above-described problem, and has an object to provide a sampling device for enabling measurement of combustible unburned substances present in combustion exhaust gas of an internal combustion engine or a boiler. It is.

{Means for Solving the Problems} In the sampling device of the present invention, the first sample gas cylinder and the second sample gas cylinder are provided in an overlapping manner, and the flammable unburned combustion exhaust gas is present in the ends on the same side. A first means provided with a combustion means for burning a substance and provided with the combustion means
The first preheating cylinder communicating with the end of the sample gas cylinder is the second
Second preheating cylinders connected to the ends of the sample gas cylinders provided with the combustion means are respectively formed, and a gas inlet is provided at an intermediate portion in the longitudinal direction of the first preheating cylinders. A heater for heating a sample gas cylinder and end portions of the first and second preheating cylinders provided with the combustion means, and first and second sample gas cylinders and the combustion means for the first and second preheating cylinders. A heater for heating the portion on the opposite side to a temperature at which a specific substance among the combustible unburned substances in the combustion exhaust gas does not cause dew condensation and partial oxidation is provided, and the first and second sample gas cylinders and the first and second sample gas cylinders are provided. Two
At a pipe connection port at each end of the preheating cylinder on the side opposite to the combustion means, a specific substance among combustible unburned substances in the combustion exhaust gas is added to the processing pipe to which each pipe connection port of the first and second preheating cylinders is connected. Is connected to a substance separation means for separating by adsorption or dew condensation, and each pipe connection port of both the first and second sample gas cylinders is connected to a differential gas analyzer.

As each of the combustion means of the first and second sample gas cylinders, there is, for example, a Pt-based or Pd-based oxidation catalyst which is heated to a required temperature. And, as the substance separating means,
There is a scrubber that adsorbs and separates a specific substance among the heatable unburned substances, or a trap that separates by dew condensation of the specific substance. Examples of the scrubber include mesh-like substances made of metal such as SUS, or porous substances such as alumina (Al ₂ O ₃ ) and molecular sieves (trade name), glass wool, etc. Adsorbs and separates a specific substance among the unburned substances. As the trap, there are a pot type at room temperature and a low temperature type such as an electronic cooler.

{Action} This sampling device introduces the combustion exhaust gas from the gas inlet into the first preheating cylinder, and divides the combustion exhaust gas into the first sample gas cylinder side and the processing pipe side. The combustion exhaust gas flowing to the side of the first sample gas cylinder is heated to a high temperature in the first preheating cylinder and reaches the combustion means, and the combustible unburned substance is converted into CO ₂ and becomes a difference measurement type gas analyzer. be introduced.

On the other hand, the combustion exhaust gas branched to the processing pipe side is introduced into the substance separation means through the processing pipe after the specific substance among the combustible unburned substances is heated in the first preheating cylinder to a temperature where condensation and partial oxidation are not caused. After the specific substance has been separated and the combustion exhaust gas flows into the second preheating cylinder and is heated to a high temperature while flowing in the second preheating cylinder, the combustion exhaust gas is guided to the combustion means. The remaining combustible unburned substances are converted into CO ₂ and sent to the differential gas analyzer.

In this way, the CO ₂ concentration difference of each sample gas from the first sample gas cylinder and the second sample gas cylinder introduced into the difference measurement type gas analyzer is measured, and the flammability is calculated from the CO ₂ concentration difference. Quantitative unburned substances.

{Example} An example of the sampling device of the present invention will be described with reference to the drawings.

In the figure, 1 is a first sample gas cylinder, 2 is a second sample gas cylinder provided in a state of overlapping with the first sample gas cylinder 1, and the first sample gas cylinder 1 and the second sample gas cylinder 2 are shown.
Oxidation Catalyst Using Pt as Combustion Means in the Same Side Edge of Carbon
There are three and four. 5 communicates with the end of the first sample gas cylinder 1 on the side of the oxidation catalyst 3 and the second sample gas cylinder 2
The first preheating cylinder 6 folded back to the side, the second pre-heating cylinder 6 connected to the end of the second sample gas cylinder 2 on the side of the oxidation catalyst 4 and folded back so as to overlap with the second sample gas cylinder 2 Preheating cylinder, 1a is a pipe connection port of the first sample gas cylinder 1, 2a is a pipe connection port of the second sample gas cylinder 2, 5a is a pipe connection port of the first preheating cylinder 5, and 6a is a pipe of the second preheating cylinder 6. Connection port, 7 is the first
A gas introduction port provided at an intermediate portion in the length direction of the preheating cylinder 5, to which a filter 8 is attached.

9 is a first sample gas cylinder 1, a second sample gas cylinder 2,
A heater that heats the end portions of the first preheating cylinder 5 and the second preheating cylinder 6 on the side of the oxidation catalysts 3 and 4, which is for heating combustion exhaust gas to the oxidation catalysts 3 and 4.
The flue gas is heated to a temperature suitable for oxidation by.
10 is a heater for heating the portion of the first sample gas cylinder 1, the second sample gas cylinder 2, the first preheating cylinder 5, and the second preheating cylinder 6 on the side opposite to the oxidation catalysts 3 and 4, which is in the combustion exhaust gas. Of the combustible unburned substance of (3) is heated to a temperature at which dew condensation is prevented and partial oxidation does not occur. 11 is a heater 9
10 covers.

Reference numeral 12 is a processing pipe that connects the pipe connection port 5a of the first preheating cylinder 5 and the pipe connection port 6a of the second preheating cylinder 6 to which a trap 13 composed of an electronic cooler as a substance separating means is connected. .

A first pipe 14 is connected to the pipe connection port 1a of the first sample gas cylinder 1, and a pump 15 is interposed in the first pipe. 16 is the second connected to the pipe connection port 2a of the second sample gas cylinder 2.
A pump 17 is interposed in the pipe. Reference numeral 18 denotes a differential gas analyzer, which is connected to the inlet 20a of the first cell 19 of the first pipe 14 and is connected to the inlet 22a of the second cell 21 of the second type.
The pipe 16 is connected. 20b is the outlet of the first cell 19, 2
2b is an outlet of the second cell 21.

Reference numerals 23a and 23b are light sources, 24 is a chopper, 25 is a detector using a condenser microphone, 26 is an amplifier, 27 is an exhaust duct of a boiler, and a first sample gas cylinder 1, a second sample gas cylinder 2, and a first sample gas cylinder 2 Preheating cylinder 5, second preheating cylinder 6, cover 11
Is inserted and installed.

In this sampling device, the combustion exhaust gas flowing through the exhaust duct 27 by the operation of the pumps 15 and 17 passes through the filter 8 from the gas introduction port 7 and flows into the first preheating cylinder 5 to be connected to the first sample gas cylinder 1 side. Divide into the processing pipe 12 side.

Then, the combustion exhaust gas flowing to the first sample gas cylinder 1 side is heated by the heating heater 10 and the heating heater 9 to reach a high temperature, and is then guided to the oxidation catalyst 3 which is brought to a required temperature, and the combustible unburned Since the substance is oxidized by the oxidation catalyst 3 and converted into CO ₂ , the sample gas is introduced into the first cell 19 of the differential gas analyzer 18 through the first pipe 14. As mentioned above,
Since the combustion exhaust gas is heated to a high temperature in the first preheating cylinder 5 and then introduced to the oxidation catalyst 3, the oxidation catalyst 3 converts the combustible unburned substance into CO ₂
Can be efficiently converted to.

On the other hand, the combustion exhaust gas that has flowed to the processing pipe 12 side prevents dew condensation of a specific substance among the combustible unburned substances in the combustion exhaust gas by the heater 10 while flowing through the first preheating cylinder 5, resulting in partial oxidation. After being heated to a non-existing temperature, it is guided to the trap 13 through the processing pipe 12 and the trap 13 is condensed to separate the specific substance. In this way, since the combustion exhaust gas is preheated in the first preheating cylinder 5 to a temperature at which the specific substance does not condense,
The combustion exhaust gas can be guided to the trap 13 without dew condensation of the specific substance in the processing pipe 12, and the specific substance can be accurately separated.

The combustion exhaust gas, which has become low temperature due to the separation of the specific substance in the trap 13, flows into the second preheating cylinder 6, and the second preheating cylinder 6
While flowing through the inside, the temperature is raised by the heater 10 and the heater 9 to reach a high temperature, and then the remaining combustible unburned substance is guided to the oxidation catalyst 4 which has been heated to the required temperature, and is oxidized by the oxidation catalyst 4. Converted to CO ₂ . The sample gas thus obtained is introduced into the second cell 21 of the differential gas analyzer 18 through the second pipe 16. As described above, the combustion exhaust gas from the processing pipe 12 is heated in the second preheating cylinder 6 to a high temperature, and then the oxidation catalyst 4
Therefore, it is possible to efficiently convert the remaining combustible unburned substance into CO ₂ because it is led to.

As described above, each sample gas sampled in each of the first sample gas cylinder 1 and the second sample gas cylinder 2 and introduced into each of the first cell 19 and the second cell 21 is interrupted by the chopper 24. The light rays from the light sources 18a and 18b incident on the first cell 19 and the second cell 21 are absorbed. Then, each light ray transmitted through each of the first cell 19 and the second cell 21 is detected by the detector 25, and the difference in CO ₂ concentration between the sample gases of the first sample gas cylinder 1 and the second sample gas cylinder 2 is detected. Is measured, and the combustible unburned substance is quantified from the difference in CO ₂ concentration.

As the gas analyzer 18 for measuring a difference amount, any gas analyzer having an arbitrary structure can be used.
First sample gas cylinder 1 disclosed in JP-A-3369
It is also possible to use a so-called fluid modulation type gas analyzer in which each sample gas sampled in each of the first and second sample gas cylinders 2 is alternately introduced into the first cell and the second cell. With the gas analyzer of
It is possible to more accurately quantify the combustible unburned substances in the combustion exhaust gas.

When quantifying the combustible unburnt substance in the combustion exhaust gas of the internal combustion engine, it is introduced into the gas introduction port 7 of the first preheating cylinder 5.
When a scrubber is used as the substance separating means, it is also connected to the processing pipe 12.

{Advantages of the Invention} As described above, the sampling device of the present invention has the first preheating in which the first sample gas cylinder and the second sample gas cylinder are arranged in a state of being overlapped with each other and communicated with the respective end portions thereof. A cylinder and a second preheating cylinder are provided, and the combustion means is arranged inside each of the first and second sample gas cylinders.

Therefore, the first and second sample gas cylinders and the first and second sample gas cylinders
All of the preheating cylinders can be heated by the heater at the same time, and the temperature of these can be efficiently managed.

Then, the combustion exhaust gas introduced into the first preheating cylinder is divided into the first sample gas cylinder side and the processing pipe side connected to the outside of the first preheating cylinder, but the combustion exhaust gas guided to the first sample gas cylinder is the first Since it is introduced into the combustion means of the first sample gas cylinder after being heated to a high temperature in the preheating cylinder, the combustion means efficiently converts a specific substance of the combustible unburned substances in the combustion exhaust gas into CO ₂ , The sample gas can be obtained accurately.

Further, the combustion exhaust gas guided to the processing pipe is heated in the first preheating cylinder to a temperature at which dew condensation and partial oxidation do not occur in the specific substance and then guided to the substance separation means in the processing pipe. Thus, the combustion exhaust gas can be guided to the substance separating means without dew condensation, and the specific substance can be accurately separated by the substance separating means.

Then, the combustion exhaust gas passing through the substance separating means has a low temperature, but since it is heated to a high temperature in the second preheating cylinder and then introduced into the combustion means of the second sample gas cylinder, it remains in the combustion exhaust gas. Efficiently burning combustible unburned substances with the combustion means
It can be converted to CO ₂ and the sample gas can be obtained accurately.

In this way, the CO ₂ concentration difference between both sample gases was measured by introducing each sample gas sampled with high precision into each of the first and second sample gas cylinders into the differential gas analyzer. Thus, the concentration of the combustible unburned substance can be continuously and accurately measured based on the difference in concentration.

[Brief description of drawings]

Drawing is a block diagram which shows the Example of this invention. 1: first sample gas cylinder, 2: second sample gas cylinder, 3: oxidation catalyst, 4: oxidation catalyst, 5: first preheating cylinder, 6: second preheating cylinder, 9 ・
10: Heater, 13: Trap, 18: Differential gas analyzer.

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-3-242534 (JP, A) Actually open 61-140949 (JP, U) Actually open 58-134767 (JP, U)

Claims (1)

(57) [Scope of utility model registration request] 1. A first sample gas cylinder and a second sample gas cylinder are provided so as to overlap with each other, and a combustion means for burning a combustible unburned substance of combustion exhaust gas is arranged in an end portion on the same side thereof, and A first preheating cylinder connected to the end of the first sample gas cylinder provided with the combustion means is formed, and a second preheating cylinder connected to the end of the second sample gas cylinder provided with the combustion means is formed. A gas inlet is provided at an intermediate portion in the lengthwise direction of the first preheating cylinder, and the first and second sample gas cylinders are connected to the first and second sample gas cylinders.
A heater for heating the end side of the second preheating cylinder provided with the combustion means, and the first and second sample gas cylinders and the first,
A heating heater is provided for heating a portion of the second preheating cylinder on the side opposite to the combustion means to a temperature at which a specific substance among combustible unburned substances in the combustion exhaust gas does not cause dew condensation or partial oxidation. 2 At the pipe connection ports of the sample gas cylinder and the first and second preheating cylinders on the opposite side to the combustion means, the processing pipes connecting the respective pipe connection ports of the first and second preheating cylinders are connected to A substance separation means for separating a specific substance among the combustible unburned substances by adsorption or dew condensation is connected, and each pipe connection port of both the first and second sample gas cylinders is connected to the differential gas analyzer. Sampling device.