Portable gravimeter for measuring exhaust moisture content
A measuring instrument and technology of moisture content, which can be used in instruments, measuring devices, scientific instruments, etc., and can solve the problem of inconvenient sampling of particulate matter.
Pending Publication Date: 2018-08-24
TIANJIN ENVIRONMENT MONITORING CENT
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Problems solved by technology
At present, in the gravimetric method, the hygroscopic tube needs to be returned to the laboratory for weighing, which brings inconvenience to the sampling of particulate matter (the automatic tracking sampler needs to input the moisture content parameter instrument in the waste (smoke) gas to correctly track and sample at the same speed), so the developed The determination method of waste (flue) gas moisture content by field gravimetric method has important practical significance
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[0013] Firstly, the innovative idea of the present invention will be described below.
[0014] 1. Choose a portable balance that meets the measurement requirements
[0015] ① GB / T 16157 "5.2.4.2 Sampling device and instrument g balance, d hygroscopic tube" requires the collected water to be 10 milligrams, and the sense of the balance to be 1 milligram. According to this requirement, the accuracy of the measurement method is 10%.
[0016] ②Environmental requirements for using a thousandth balance, the environment is 20°C, the relative humidity is about 50%, the test environment has no vibration, and no electromagnetic field interference. It is difficult to achieve this condition at the sampling site of general fixed pollution sources.
[0017] Because the volume of one-thousandth balance is too large to be portable, and the electronic pocket balance on the market generally has a sensing capacity of 10 mg, although it can solve the problem of portability, but because the wei...
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The invention relates to a portable gravimeter for measuring exhaust moisture content. The gravimeter comprises an instrument box with a sealing cover, an absorption bottle and an absorption tube connected to each other, and an absorption tube fixing bracket for fixing the absorption bottle and the absorption tube, wherein an exhaust inlet and an exhaust outlet are formed in the instrument box; the absorption bottle and the absorption tube are connected to the outside of the exhaust inlet and the exhaust outlet through pipelines at both ends, absorption liquid is placed in the absorption bottle and the absorption tube, and a weighing device is placed at the bottom of the instrument box, a boss with a through hole is arranged at the bottom of the absorption tube fixing bracket, a T-shaped bracket is placed on the boss, and the lower part of the T-shaped bracket passes out of the through hole. In the state of exhaust collection, the absorption tube fixing bracket is fixedly connected with the instrument box, and the T-shaped bracket is suspended; in the state of exhaust moisture measurement, the absorption tube fixing bracket is not connected to the instrument box, and is placed on the weighing device through the T-shaped bracket. The portable gravimeter can improve the accuracy and convenience for measuring the moisture content of exhaust or smoke.
Description
technical field [0001] The invention relates to an on-site gravimetric method for measuring the moisture content of exhaust gas. Background technique [0002] The moisture content of waste (smoke) gas refers to the mass (grams) of water vapor that coexists with one kilogram of dry air in the wet air of waste (smoke) gas. It is an important parameter for exhaust gas monitoring. The accuracy of this parameter determination is directly related to the accuracy of the detection results of pollutants in exhaust gas emissions. The GB 16157-1996 standard provides three methods for the determination of the moisture content of exhaust (smoke) gas with weight method, condensation method, dry wet bulb method. In recent years, various moisture content measurement methods such as resistance-capacitance method, capacitance method, and laser method have appeared, but these methods are not mature enough and are not national standard methods. [0003] The gravimetric method is more accurate...
Claims
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IPC IPC(8): G01N5/02
CPCG01N5/025
Inventor 王同建魏恩棋王辉吴宇峰孙国鼐许亮张倩郑君孙国振李江涛陆彦彬
Owner TIANJIN ENVIRONMENT MONITORING CENT