CN103712898A

CN103712898A - Atmosphere suspended particulate matter mass concentration detector

Info

Publication number: CN103712898A
Application number: CN201310323923.6A
Authority: CN
Inventors: 戴艺; 戴庆超
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-07-30
Filing date: 2013-07-30
Publication date: 2014-04-09

Abstract

The invention relates to an atmosphere suspended particulate matter mass concentration detector based on the national environmental protection HJ618-2011 standard, wherein the atmosphere suspended particulate matter mass concentration detector is suitable for detection of mass concentration of particulate matters from PM2.5 to less than PM 10 in an air environment. In the prior art, PM2.5 fine particles are difficultly interdicted on filtration membranes with the existing quartz, mixed cellulose and other organic filtration membranes; and the oscillation frequency of the existing electronic oscillation balance method is affected by excessive thick dust accumulation, and the filtration membrane weight method has disadvantages of complex operation and difficult calibration accuracy. According to the present invention, based on the aerosol characteristic of the less than PM 10 particulate matters, particularly the PM2.5 fine particulate matters in the ambient air, a suitable microgram scale of a beta-source with a nickel-63 low-energy short-range is selected, the ionization energy absorption principle can be completed provided when the electron is loaded, and the atomic nucleus electron of the dust matter is fixed; and compared with the manual filtration membrane weight method, the method of the present invention can achieve the high accuracy requirement.

Description

Atmosphere suspended particulate substance quality concentration determination instrument

Technical field:

The present invention is according to national environmental protection HJ618-2011, HJ/93, HJ/T194-2005 standard.In conjunction with low energy β source, nickel-63 characteristic in national isotope management regulation, be again that product is exempted from the linchpin of non-strict control.Particularly be applicable to the mensuration of the mass concentration of atmosphere suspended particulate substance, surrounding air PM10 is containing the mensuration of the following nominal particle size dust of PM2.5 mass concentration.

Background technology:

To the mass concentration of flue dust and airborne dust, is always both at home and abroad the heavy method of filter membrane meter, its equipment complicated heavy, operate loaded down with trivial details, hysteresis operating mode, precision is not high.Especially to PM2.5, be to be worth inquiring into below, before Zhong Zhi China Qing Dynasty, the smog of water pipe sucks lung after water filtration, visible general filtrate is difficult to Zu Liu and lives below PM2.5, refer in particular to the tested particle of Yi0.1μWei unit, be exactly organic filter membranes such as new quartz filter, cellulose mixture, also difficulty guarantees that 99% is stopped on filter membrane.In addition, there is β ray to replace balance to irradiate to adopt the filter membrane before and after dirt to calculate dust concentration, still have the not high and troublesome poeration of precision.Also have, electronic oscillation sedimentation balance method is that dust accumulation sky plane surface is uneven affect actual oscillation frequency, and existence and the filter membrane meter weight method problem such as stated accuracy how.

Summary of the invention:

The object of the invention is to cast out the β source of long promethium-147 Thickness Measurement by Microwave of high-energy range that former detection dust concentration uses, and complex instrument structure.Because, in surrounding air, be that its characteristic particle diameter of suspended particulate substance is little lightweight based on Aerosol Properties, must select the energy of the β isotope source of the following and Gamma Magnitude of suitable application PM10, and carry also more safer convenient than in the past.

For achieving the above object; according to isotope nickel-63 low energy and short-range β source; when following by suspended particulate substance PM10, just in time give full play to the endergonic principle of ionization; adopting β source is that a utmost point and collector form the two poles of the earth symmetry with high-tension electricity, and collector should be eliminated ground electronic interferences by two protection ring plate supports.Because the ionization uptake of the atomic nucleus electronics of particle in principle is fixed, so instrument can reach more high-precision requirement.Repeatedly making a gesture of measuring after calibration with filter membrane meter Dust Capacity heavily, can be precisely errorless.Also have, in order to strengthen Beta-ray direction expulsive force and to improve sampling utmost point efficiency, Curved is made in the two ends of two symmetrical pole plates, as A-A cut-away view.Also high-field electrode can be made to cylindrical shape; collect very thin pole and stand in high-field electrode cylinder central authorities; one end be converted into 90 degree extension rod overcoat polytetrafluoro insulation tubes on it attached protection ring through shell, fix; and be collector circuit lead point; beta ray source is made to toroidal ring piece shape and is arranged on shell and enters gas port end, and circular ring plate center pit is air intake opening.

Owing to adopting above-mentioned nickel-63 low energy and short-range β isotope source, and be the technical scheme of the two symmetrical utmost points, its admission piece is provided with external thread and is convenient to connect cutter spout, detects respectively PM10, PM2.5.Lower end exhausr port Design enlargement be applicable to detect flow field isokinetic sampling, and contrasts application through the filter membrane clip that external thread can be taken over the heavy method of filter membrane meter.Meet the requirement of national environmental protection HJ618-2011 standard and isotope management regulation.

Accompanying drawing explanation:

Fig. 1 is atmosphere suspended particulate substance quality determination instrument cut-away view

1-β source 2-high-pressure stage 3-shell 4-polytetrafluoro insulating mat 5-exoelectron is eliminated the upper cap bucket 8-protection of net 6-admission piece 7-ring plate 9-and is absorbed a cap bucket 11-exhausr port 12-electronics load 13-end cap bayonet socket under utmost point 10-

A-A cut-away view is Huan's Fig. 1 face cut-away view, and the two ends of two symmetrical pole plates are made to curved shape and the shell adapting and insulating mat shape.

Embodiment:

The concrete structure of atmosphere suspended particulate substance quality determination instrument of the present invention and the detection of embodiment and demarcation flow process: isotope β source (1) is arranged on stainless sheet steel shell (3), upper through polytetrafluoro insulating mat (4) and the thin aluminium alloy plate composition positive high voltage utmost point, for strengthening isotope directions of rays electromotive force and reducing flow field vortex flow, high-pressure polar plate (2), bending two ends are become to A-A cut-away view shape.The material that absorbs the utmost point (9) is identical with high-pressure stage through insulating mat (4) with shape, but is supported by protection ring plate (8).On the stainless steel of shell (3), cap bucket (7) is established an end cap bayonet socket (13), and adds sweet seal and exoelectron elimination net (5).Under stainless steel, cap bucket (10) also should be established an end cap bayonet socket (13), and adds sweet seal, and its cap bucket slope 30 degree are for adapting to exhausr port negative pressure value, keep admission piece (6) Test Field isokinetic sampling.Admission piece (6) endoporus is to be demarcated as 8mm at meteorological wind tunnel.If so must establish a transition conduit while being connected with PM10, PM2.5 cutter spout and admission piece (6) spiral shell button is tightly connected, make through Electronic Negative charged (12), to carry out positron-electron absorption containing particle gas, and completed by traffic requirement by aspiration pump.Exhausr port (11) can be tightly connected with filter membrane clip again through spiral shell button, connects traffic requirement carry out manual contrast and demarcation of filtering the heavy method of meter through aspiration pump.This atmosphere suspended particulate substance quality determination instrument is multi-functional, and by detection probe, handle and instrument container and temperature element, pitot tube etc.

Claims

1. one kind according to national environmental protection HJ618-2011 standard, be applicable to the mensuration of atmosphere suspended particulate substance quality concentration, all-embracing detection air ambient PM10 is containing the particle quality concentration below PM2.5, and weigh with the manual meter that filters the device that method contrasts or demarcates, comprise β source (1), high-pressure stage (2), shell (3), polytetrafluoro insulating mat (4), admission piece (6), upper cap bucket (7), absorb the utmost point (9), lower cap bucket (10), exhausr port (11), polytetrafluoro insulating mat (5) is pasted in its feature shell (3) the inside, by high-pressure stage (3) and the symmetrical absorption utmost point (9) two ends with on polytetrafluoro insulated rivet (10) fixed housing, described admission piece (6) and exhausr port (11) have external thread, it guarantees airtight with the weld seam of upper and lower wind scoop, described upper cap bucket (7) end

Face arranges an exoelectron and eliminates copper mesh (5), and the described absorption utmost point (9) is by aluminium, to close protection ring plate to support.

2. the mensuration of atmosphere suspended particulate substance quality concentration according to claim 1, the admission piece (6) that it is characterized in that sampling has the cutter for particles spout of the replaceable different model of external thread, and exhausr port (11) external thread is made to filter membrane clip and mates.

3. the mensuration of atmosphere suspended particulate substance quality concentration according to claim 1, is characterized in that Curved is made at the two ends of high-pressure stage (3) plate and the absorption utmost point (9) plate.

4. the mensuration of atmosphere suspended particulate substance quality concentration according to claim 1, it is characterized in that high-pressure stage (2) plate can be made to cylindrical shape, absorb the utmost point (9) and can be made to the thin cylindrical cylindrical center that stands in, upper end curves 90 degree extending sleeve polytetrafluoro insulation tubes and introduces in this detection probe handle through shell (3), β source (1) is made to toroidal ring piece shape and is arranged on shell (3) admission piece (6) end, ring plate center pit is the inner hole of admission piece (6), and exhausr port (11) and admission piece (6) are identical by claim 2 separately.