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Low-concentration smoke dust sampling device and method

A sampling device and low-concentration technology, which are applied in the field of low-concentration smoke and dust sampling devices, can solve problems such as insufficient collection efficiency, distorted test results, and damage to filter materials, so as to achieve an environment that is not easily polluted, avoids deposition, and avoids moisture condensation. Effect

Inactive Publication Date: 2015-12-23
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with the continuous improvement of my country's environmental protection requirements, the existing smoke sampling methods have great limitations in the low-concentration smoke testing represented by coal-fired power plants: 1) when the smoke concentration is very low (5mg / m 3 Below), the particle composition is mainly fine or very fine particles, because the existing filter material is not efficient enough to capture it, fine particles easily pass through the filter layer with the airflow, resulting in a low test concentration; 2) in Under the condition of high-humidity flue gas, moisture is easy to condense in the flue dust sampling system, soaking the filter material, and it is easy to cause damage or pollution to the filter material during long-term sampling, which seriously distorts the test results

Method used

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  • Low-concentration smoke dust sampling device and method

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Effect test

Embodiment 1

[0027] Such as figure 1 The shown low-concentration smoke sampling device is an embodiment of the present invention, which is composed of a sampling gun 1 , a condenser 7 , a dryer 6 , and a host 3 . The host 3 is composed of a main box, a flow meter, a speed-regulating air pump and a single-chip integrated assembly, and the flow meter and the speed-regulating air pump are connected with the single-chip in sequence. The sampling gun 1 includes a handle, a sampling tube 12 , a multi-stage sampling head 9 installed at the head of the sampling tube, a sampling nozzle 8 connected to the front end of the multi-stage sampling head, an S-type pitot tube 11 and a thermocouple 10 . The sampling tube 12, the S-type Pitot tube 11 and the thermocouple 10 are all connected to the handle. The condenser 7 and the drier 6 are arranged between the gas outlet end of the sampling pipe and the flow meter to prevent parts such as the flow meter and the speed-regulating air pump from being corrode...

Embodiment 2

[0031] Utilize the soot sampling method of the low-concentration soot sampling device of embodiment one, comprise the following steps:

[0032] (1) A dust collection film coated with high-temperature-resistant glue is installed on the collection plates of the dust collection units at all levels of the multi-stage sampling head 9;

[0033] (2) Predict the flue gas flow rate, and install a sampling nozzle 8 with a suitable caliber on the sampling gun 1;

[0034] (3) Input parameters such as atmospheric pressure, number of sampling points, humidity and oxygen content of the measured flue gas into the microcontroller;

[0035](4) Heating sampling gun 1, the heating device adopts high-power heating, and the heating temperature is not lower than 180 o C. No condensed water can appear in the sampling pipe 12 during the sampling process, and the sampling gun 1 is placed in the flue cross section in the direction of the air flow for testing. During the test, the single-chip microcomp...

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Abstract

The invention discloses a low-concentration smoke dust sampling device. The low-concentration smoke dust sampling device comprises a main machine, a sampling gun, a condenser and a drier. The sampling gun comprises a handle, a sampling tube, a pitot tube and a thermocouple, wherein the sampling tube, the pitot tube and the thermocouple are connected with the handle. The gas outlet end of the sampling tube is sequentially connected with the condenser, the drier and the main machine. The thermocouple and the pitot tube are connected with the main machine. A multi-stage sampling head is installed at the head of the sampling tube. A sampling nozzle is arranged at the front end of the multi-stage sampling head. The multi-stage sampling head comprises a shell and three dust collection units arranged in the shell. The dust collection units are sequentially arranged in the flowing direction of smoke. The smoke entering the sampling tube is sequentially in contact with the dust collection units, smoke dust is adsorbed by the dust collection units, and the smoke dust collecting efficiency of the device is improved. The invention further discloses a low-concentration smoke dust sampling method in which the device is adopted. By means of the low-concentration smoke dust sampling device and method, the concentration of the smoke dust is accurately measured under the low-concentration and high-humidity working condition.

Description

technical field [0001] The invention relates to the field of environmental detection, in particular to a low-concentration smoke sampling device and method. Background technique [0002] GB / T16157-1996 "Determination of Particulate Matter in Exhaust from Stationary Pollution Sources and Sampling Method of Gaseous Pollutants" stipulates the method of isokinetic sampling and measurement of smoke and dust. It is recommended to use filter cartridges to collect particulate matter in flue gas and determine its concentration. Most of the existing smoke sampling devices and methods also adopt the filtration method (filter cartridge or filter membrane) to collect the smoke. However, with the continuous improvement of my country's environmental protection requirements, the existing dust sampling methods have great limitations in the low-concentration dust testing represented by coal-fired power plants: 1) when the dust concentration is very low (5mg / m 3 Below), the particle compositi...

Claims

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Application Information

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IPC IPC(8): G01N1/24
Inventor 唐念李丽张凯汤龙华盘思伟赵宁
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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