Sampling apparatus and method for detecting formaldehyde content of engines tail gas
A sampling device and engine technology, applied in measuring devices, sampling devices, instruments, etc., can solve the problems of formaldehyde detection interference, expensive instruments, and difficulty in preparation, and achieve the effects of low cost, convenient operation, and simple structure
Inactive Publication Date: 2007-09-26
TIANJIN UNIV
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[0002] The methods for detecting formaldehyde in the atmosphere with high accuracy mainly include proton transfer ionization technology, Fourier transform infrared spectroscopy, differential optical absorption spectroscopy, etc., but the prices of the instruments used are relatively expensive and should not be popularized.
In addition, colorimetry, spectrophotometry, etc. are only suitable for the measurement of formaldehyde content in mixed gas with low components, and their sensitivity is low, so they are not suitable for the detection of formaldehyde in exhaust gas of internal combustion engines
The difficulty of formaldehyde determination in internal combustion engine exhaust mainly contains three aspects: the one, the boiling point of formaldehyde is low, its standard gas is difficult to prepare; ) has the problem of low response to formaldehyde; third, due to the presence of a large amount of HC, NOx, CO, CO2, and alcohols (when alcohols are used as alternative fuels for internal combustion engines) in the exhaust gas of internal combustion engines, the components are complex, which interferes with the detection of formaldehyde. The detection of formaldehyde in indoor and atmospheric environments is more difficult
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[0037] With reference to Fig. 1, probe 1 is made by stainless steel pipe processing, and air inlet end stretches into exhaust pipe 15 (extends to and exhaust pipe central axis place) in sampling process, and exhaust end is sealed with nylon pipe inlet end;
[0038] The inlet constant temperature mechanism 12 is connected with the probe 1, so that the gas can be kept between 78°C and 82°C after passing through the inlet constant temperature mechanism 10; referring to Figure 2, the inlet constant temperature mechanism 12 includes: a pipeline 3 for the gas to pass through, The thermal resistance type heating belt 16 wrapped outside the pipeline, the insulation cotton 17 wrapped outside the heating belt, the K-type thermal couple 18 obliquely buried at the axis of the junction of the pipeline and the exhaust gas absorption derivative mechanism, and the K-type thermocouple The positive and negative pole wires and the temperature control relay 5 connected with the positive and negati...
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This invention relates to one motor tail gas test sampling method and device, wherein, the device comprises one probe, gas-in constant structure, tail absorptive derive structure and sample gas flow control structure. The invention method comprises the following steps: a, making absorptive liquid; b, injecting it into two series U shape multi-hole board; c, loading proper absorbent cotton into dry tube; d, adjusting the structure temperature as 80+-2deg.C; e, starting micro vacuum pump between 0.12L / min-0.15L / min; f, vacuum pumping for 5 minutes; g, starting continual sampling with time range of 10min-15min; H, after sampling pouring the liquid into one contain bottle to get the sample liquid.
Description
technical field [0001] The invention relates to a sampling device and method for engine exhaust detection, and belongs to the cross technical field of engines and environmental monitoring instruments. Background technique [0002] Methods for detecting formaldehyde in the atmosphere with high accuracy mainly include proton transfer ionization technology, Fourier transform infrared spectroscopy, differential optical absorption spectroscopy, etc., but the prices of the instruments used are relatively expensive and should not be popularized. In addition, colorimetry, spectrophotometry, etc. are only suitable for the measurement of formaldehyde content in mixed gas with less components, and their sensitivity is low, so they are not suitable for the detection of formaldehyde in the exhaust gas of internal combustion engines. The difficulty of formaldehyde determination in internal combustion engine exhaust mainly contains three aspects: the one, the boiling point of formaldehyde ...
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IPC IPC(8): G01N1/22G01N30/06
Inventor 姚春德彭红梅李帅刘义亭
Owner TIANJIN UNIV
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