JPS6166159A - Measurement of hc compound in particulate and apparatus thereof - Google Patents

Abstract

PURPOSE:To measure simply, easily and rapidly an HC-compound in a particulate, by measuring the total HC quantity of exhaust gas including gaseous condition HC of 2-system gas line of a diesel engine and gasified position by heating and conducting a differential calculation. CONSTITUTION:Exhaust gas of a diesel engine 2 is subjected to series sampling in No.1 and NO.2 gas lines 4, 5 through diluting tunnel 1, sample gas cutlet tube 3. The gaseous condition HC in the exhaust gas is measured by a filter 6 and the No.1 measuring apparatus 7 of this line. On the other hand, the HC compound in a particulate contained in the exhaust gas after heating by a heater 8 is evaporated and gasified for measurement of the total HC quantity in the exhaust gas by a filter 9 and the No.2 measuring apparatus 10. Further, both measured values are differentially processed by a computer 11 and thus, the HC compound in the particulate is measured in a short length of time, as extracting gas etc. for simple and easy measurements is not necessary.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method for measuring HC compounds (organic solvent soluble substances), which are precursors to soot in diesel engine exhaust gas, and a concentration measurement method used in the method. Regarding equipment.

(Prior art) In the high-temperature exhaust gas discharged from a diesel engine, HC-formed IC compounds, which are precursors to soot, are condensed, and these are attached or adsorbed to carbon particles in the gas, forming particles. Curates are configured.

By the way, in order to measure the amount of IC compounds in these particulates, conventionally, the particulates are sampled on a filter, and only the IC compounds are extracted with an organic solvent using a Soxhlet extractor. The organic solvent is heated and evaporated, and the IC is determined by weighing the residue.
Measuring the amount of a compound.

(Problems to be Solved by the Invention) However, this method requires an extremely complicated manual analysis procedure, and in addition, it takes a long time for extraction (on average, 8
This method has the disadvantage that it takes about 30 minutes (about 30 minutes) and that it can only be measured intermittently.

From the perspective of diesel engine research, we need a method and device that can transiently and extremely quickly measure the generation status of IC compounds under various engine operating conditions, including acceleration and deceleration. development is awaited.

An object of the present invention is to provide a method for measuring IC compounds that can satisfy the above-mentioned needs, and an apparatus used in the method.

(Means for Solving the Problems) In order to achieve the above object, the method for measuring t]C compounds in particulates contained in engine exhaust gas according to the present invention is based on carbon particles and soot condensed on the carbon particles. Diesel engine exhaust gas containing particulates composed of IC compounds, which are pre-stage substances, is connected to a first gas line for measuring the amount of gaseous I]C in the exhaust gas, and by heating the IC compounds in the particulates. The second step is to measure the total amount of HC in the exhaust gas after evaporation and gasification.
The method is characterized in that the amount of IC compounds in the particulates is measured based on the difference in the amount of HC measured in both gas lines.

The device for measuring IC compounds in engine exhaust gas according to the present invention used in the above method uses carbon particles and l-
A gas line for diesel engine exhaust gas containing particulates composed of an IC compound is provided with a first gas line equipped with a first measuring device for measuring the amount of gaseous 1-(C) in the exhaust gas; A second gas line equipped with a heating unit for evaporating and gasifying the IC compound and a second measuring device for measuring the total amount of HC in the exhaust gas after the evaporation and gasification is connected to the The present invention is characterized in that it is equipped with a calculator that calculates the amount of IC compound in the particulates based on the HC amount measured by two measuring devices.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. In the figure, l is a dilution tunnel connected to the exhaust gas pipe of the diesel engine 2, and a sample gas extraction pipe 3 is branched and connected. .

4 is a first gas line, and 5 is a second gas line, which are connected in parallel to the sample gas extraction pipe 3. One first gas line 4 is connected to particulates in the exhaust gas (as mentioned above, it is composed of condensed IC compounds, which are the precursor to soot, and carbon particles that have adhered or adsorbed them). ) and other impurities, and a first measuring device 7 that measures the amount of gaseous HC in the exhaust gas after passing through the filter 6.
is provided.

The other second gas 2-in 5 includes a heating section 8 that heats the exhaust gas passing through the gas line 5 to evaporate and gasify the IC compound in the particulates, and a heating section 8 that heats the exhaust gas passing through the gas line 5 to evaporate and gasify the IC compound in the particulates, and a heating section 8 that heats the exhaust gas passing through the gas line 5 to evaporate and gasify the IC compound in the particulates. A second filter 9 that captures substances, and all HC in the gas after passing through this second filter 9.
(The evaporated and gasified IC compound and the original gaseous HC
A second measuring device 10 is provided for measuring the amount (sum of

Reference numeral 11 denotes a computing unit which, based on the measured value of the amount of gaseous HC from the first measuring device 7 and the measured value of the total HC amount from the second measuring device 10, determines the difference between the two to determine whether it is a precursor to soot. This method measures the amount of IC compounds, and the concentration of IC compounds, which are precursors to soot, in diesel engine exhaust gas can be determined from the amount of IC compounds.

(Effects of the Invention) As explained above, according to the method for measuring HC compounds in particulates contained in engine exhaust gas according to the first invention, total HC The amount of HC compounds in particulates contained in engine exhaust gas can be measured instantaneously and continuously based on the difference between the amount of HC and the amount of HC that is originally gaseous. Since it is possible to transiently know the generation status of HC compounds under various operating conditions, it can play a major role in research on measures to reduce HC compounds.

According to the HC compound measuring device according to the second aspect of the present invention, although the device is relatively simple in structure, the above method can be carried out simply and easily, and it is also possible to perform highly accurate measurements. Wow

[Brief explanation of the drawing]

The drawing is a configuration diagram of an HC compound measuring device showing an example of the present invention. 4...First gas line, 5...Second gas line, 7
. . . first measuring instrument, 8 . . . heating section, 10 . . . second measuring instrument, 11 .

Claims (2)

[Claims] (1) A first gas for measuring the amount of gaseous HC in diesel engine exhaust gas containing particulates composed of carbon particles and HC compounds that are pre-form substances of soot condensed on the carbon particles. line and a second gas line that measures the total amount of HC in the exhaust gas after evaporating and gasifying the HC compounds in the particulates by heating, and the difference in the amount of HC measured in both gas lines. A method for measuring HC compounds in particulates, the method comprising measuring the amount of HC compounds in particulates based on. (2) Measure the amount of gaseous HC in the diesel engine exhaust gas gas line containing particulates composed of carbon particles and HC compounds that are pre-form substances of soot condensed on the carbon particles. A first gas line equipped with a first measuring device, a heating section that evaporates and gasifies the HC compounds in the particulates, and a second measuring device that measures the total amount of HC in the exhaust gas after the evaporation and gasification. and a computing unit for calculating the amount of HC compound in the particulates based on the measured value of the HC amount by the first and second measuring devices. An apparatus for measuring HC compounds in particulates.