Atmospheric dust sampling method and monitoring method

A dust and atmospheric technology, which is applied in the field of atmospheric dust sampling and monitoring, can solve the problems of reduced accuracy of atmospheric dust sampling and detection, high cost, and low degree of automation, and achieves low dust sampling and detection costs, convenient operation and use, and automation high degree of effect

Inactive Publication Date: 2010-04-07
FOCUSED PHOTONICS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. Low degree of automation
[0007] The replacement of the nozzle needs to be done manually, it cannot be switched automatically, the degree of automation is low, and it takes a long time
[0008] 2. High cost
[0009] When sampling dust with different cutting particle sizes, multiple cutters or multiple nozzle assemblies are needed to complete the sampling, which makes the cost of dust detection high
[0010] 3. Poor reliability
[0011] When sampling dust with different cutting particle sizes, different nozzles need to be replaced, which makes the sealing between the nozzle and the cutter worse, which affects the performance of the nozzle and the cutter, brings errors to the sampling, and makes the atmosphere Reduced accuracy of dust sampling and detection
[0012] 4. Poor comparability of test results
[0013] Frequent replacement of the nozzle will make the working state of the dust meter cutter unable to ensure complete consistency, resulting in differences between the detection states of the same cutting particle size dust, making the comparability of the before and after detection poor
[0014] 5. Inconvenient to use
The cutter is often set at a relatively high position, and it is very inconvenient to manually climb up to operate when replacing the nozzle
[0016] 6. High maintenance cost
[0017] Frequent replacement of nozzles will degrade the stability of the sampling and detection system and increase the cost of manual maintenance

Method used

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  • Atmospheric dust sampling method and monitoring method
  • Atmospheric dust sampling method and monitoring method
  • Atmospheric dust sampling method and monitoring method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Such as figure 2 As shown, an atmospheric dust sampling device includes a cutter 11, a sampling pump 4 and a flow control unit.

[0083] The flow control unit includes a first-stage regulating device and a second-stage regulating device; the first-stage regulating device is a frequency converter, which is set on the sampling pump; the second-stage regulating device is a flow regulating valve 3 . The flow control unit adjusts the gas flow through the cutter in two stages: coarse adjustment and fine adjustment. First, the frequency converter is used to roughly adjust the flow rate, and the flow value is adjusted to the vicinity of the target flow value, and then the flow value is precisely adjusted to the target flow value by using the flow regulating valve 3 .

[0084] A frequency converter is added to the flow control, so that the sampling pump has multiple gears, and the fine-tuning is supplemented by a flow regulating valve, which is easy to control and saves energy...

Embodiment 2

[0126] Such as Figure 4 Shown, a kind of atmospheric dust sampling device is different from embodiment 1:

[0127] The first-stage regulating device is a pressure protection flow path, and the pressure protection flow path is one or more paths, and each path adopts a solenoid valve or a pressure relief valve or a reverse check valve. In this embodiment, a three-way pressure relief valve is selected, respectively. It is pressure relief valve of No. 01, No. 02 and No. 03.

[0128] The flow control unit adjusts the gas flow through the nozzle in two stages: coarse adjustment and fine adjustment. When the gas flow required by the nozzle is relatively small, the pressure relief valve is opened in time as a coarse adjustment device to form a loop. The sampling pump only extracts a small amount of gas from the nozzle flow path. The gas flow is close to the target value, and then the flow value is adjusted through the fine-tuning regulating valve to the exact target flow value.

...

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Abstract

The invention discloses an atmospheric dust sampling method and a monitoring method applying the sampling method. Through specially designed diameter of a nozzle and distance between a nozzle outlet and a collector, under the condition of not changing the diameter of the nozzle of a cutter, the sampling and monitoring of dust with different cut particle sizes can be realized only by adjusting air flow through the nozzle. The methods have the characteristics of high automation degree, good reliability, convenient operation and use, and the like.

Description

technical field [0001] The invention relates to atmospheric dust sampling and monitoring, in particular to a method capable of sampling and monitoring dust with two or more cutting particle sizes. Background technique [0002] Existing Beta particle atmospheric dust detectors or micro-oscillating balance methods or other similar methods for detecting atmospheric dust can only detect the concentration of dust with a cut particle size. [0003] PM 10 The detection of dust belongs to the items that are mandatory by the state, and there is no requirement for the detection of dust with other cutting particle sizes. However, with the development of society, the detection requirements for atmospheric dust are getting higher and higher, and it is urgent to collect and detect dust with other cutting particle sizes, such as PM 5 , PM 2.5 , while the existing general practice is: directly purchase two or more instruments, which are used to sample and detect dust with different cutti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/14G01N5/00G01N15/06
Inventor 佘检求李增珍王健
Owner FOCUSED PHOTONICS
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