CN1570590A

CN1570590A - Superfine particles sampling device

Info

Publication number: CN1570590A
Application number: CN 200410013107
Authority: CN
Inventors: 徐明厚; 郑楚光; 刘小伟; 柳朝晖; 于敦喜; 黄建辉
Original assignee: Huazhong University of Science and Technology
Current assignee: Huazhong University of Science and Technology
Priority date: 2004-04-28
Filing date: 2004-04-28
Publication date: 2005-01-26
Anticipated expiration: 2024-04-28
Also published as: CN1247981C

Abstract

This invention discloses a sampling device for ultrafine grain and its tip is located on the upper edge of central sampling tube while outer tube covers the central tube. There fixes inflow and outflow tubes for cooling between the layers, and the tip of the inflow tube is located in the end portion of central sampling tube and that of the outflow tube is located in the upper portion. There locate two diluting tube between outer tube and central sampling tube and their air vent is symmetrically located on the tube tip. The tip, central sampling tube and outer tube form a sealing cavity. The invention can dilute the gas of high temperature to ensure effective sampling and prevent the sample from reaction in the tube. This invention is especially suitable for the sampling of ultrafine grain with high temperature environments such as metallurgy furnace,industrial furnace, etc.

Description

A kind of superfine particle sampler

Technical field

The invention belongs to environmental protection technical field, be specifically related to a kind of superfine particle sampler.

Background technology

Common superfine particle sampler or have only sampling system, or have only sampling system and dilution system; Or have only sampling system and cooling system.If there is not cooling system, then can only be used for low, warm environment, under hot environment, work long hours, stopple coupon can be burnt out because of too high temperature, even also there is the unfavorable situation of sampling pipe head cooling effectiveness in existing cooling system; If there is not dilution system, then can't extract superfine particulate matter, promptly use other method to extract particle, accuracy that can not the warranty test reaction time.

Summary of the invention

The objective of the invention is to overcome above-mentioned weak point, a kind of superfine particle sampler is provided; This sampler can extract superfine particulate matter effectively and prevent the continuation reaction of institute's sample thief in stopple coupon inside; Simultaneously, can reduce the high-temperature gas sample temperature greatly, guarantee that stopple coupon can long-term continuous working under hot environment.

A kind of superfine particle sampler provided by the invention, comprise stopple coupon and cooling water channel, it is characterized in that: tube head is positioned at the upper end of sampling core pipe, outer layer sleeve is enclosed within outside the sampling core pipe, be provided with water inlet pipe and the rising pipe that is used to cool off between outer layer sleeve and the sampling core pipe, the mouth of pipe of water inlet pipe is positioned at the bottom of sampling core pipe, the mouth of pipe of rising pipe is positioned at the upper end of sampling core pipe, be provided with two dilution tracheaes between outer layer sleeve and the sampling core pipe, its gas outlet symmetry is positioned on the tube head; The cavity that tube head, sampling core pipe and outer layer sleeve form is the sealing shape.

The invention has the advantages that: owing to possess the inert gas dilution passage, not only can reduce the high-temperature gas sample temperature in the stopple coupon, protection sampling core pipe (particularly its head), and the inert gas composition can fully dilute the gaseous sample of getting, promptly guaranteed effectively to extract sample, prevent the continuation reaction of sample in stopple coupon again, thereby guarantee that institute's sample thief is consistent with sampling spot place composition; The cooling water channel that this device possessed, its cooling effect is better than prior art; This cooling water channel can cool off continuously to being in the sampling core pipe of working under the hot environment, reduce the bulk temperature of stopple coupon greatly, thereby guarantee that stopple coupon can long-term continuous working under hot environment, realize the superfine particle serial sampling under the hot environment.

Description of drawings

Fig. 1 is the longitudinal profile structural representation of sampler provided by the invention;

Fig. 2 is the horizontal section structural representation of sampler provided by the invention;

Fig. 3 is the A-A sectional view of Fig. 1 and Fig. 2.

Embodiment

The present invention is described in further detail below in conjunction with example and accompanying drawing.

As shown in drawings, an end of sampling core pipe 5 links to each other with tube head 1, and the other end connects aspiration pump extracting high-temperature smoke sample, carries the high-temperature flue gas of superfine particulate matter and sends into other Collection and analysis devices by the tube head 1 and the sampling core pipe 5 of sampler.The sampling core pipe 5 outer outer layer sleeves 2 that are with.Between sampling core pipe 5 and outer layer sleeve 2, be provided with the water inlet pipe 3 of chilled water and the rising pipe 3 ' of chilled water.The mouth of pipe of water inlet pipe 3 is positioned at the bottom of sampling core pipe 5, and the mouth of pipe of rising pipe 3 ' is positioned at the upper end of sampling core pipe 5, forms cooling water channel institute's sample thief is cooled off, so that the serial sampling under the realization high temperature.Be provided with two nitrogen tube 6,7 between sampling core pipe 5 and outer layer sleeve 2, the mouth of pipe symmetry of nitrogen tube 6,7 is arranged in tube head 1.Tube head 1, sampling core pipe 5 and outer layer sleeve 2 should constitute an annular seal space.For easy to make, end cover 4 sealings are adopted in outer layer sleeve 2 lower ends.

Should note following problem in manufacturing process: (1) guarantees the sealing of sampling core pipe 5 and tube head 1, prevent that chilled water from entering sampling core pipe 5, cause the laboratory sample of collecting moistening, cause test failure, and might damage the analytical equipment that sampling core pipe 5 rear portions are connected; (2) guarantee the sealing of nitrogen tube 6 and tube head 1, prevent that nitrogen from entering cooling water channel, influences N ₂The dilution effect of dilution system and tube head 1 and the intrasystem cooling effect of cooling water channel damage sampler, and cause test failure when hot test.(3) value apart from d1 between the mouth of pipe of cooling water outlet pipe 3 ' and the tube head should be recommended 5mm within 3-8mm.The d1 value is too little then can be because of causing internal pressure big after the low amounts of water vaporization, and chilled water is difficult to enter; The d1 value then can influence the cooling effect of sampling apparatus head too greatly.(4) it is unsuitable oversize that cooling water inlet pipe 3 stretches into the value of length d 2 of outer layer sleeve, recommends 5-8mm, in order to avoid reduce effective chilled water volume.

Structural design of the present invention makes the present invention possess cooling water channel, can reduce the medium temperature in the sampler effectively, guarantees the serial sampling at high temperature of this device.Simultaneously; adopt the nitrogen tube of two symmetrical distributions to pass to the high-temperature smoke sample that nitrogen dilution is got; not only can utilize the temperature of the air-cooled effect reduction sampler head of nitrogen stream; the protection sampling head; the more important thing is by the inert gas composition and fully dilute institute's sample thief, so promptly can guarantee effectively to extract sample, can prevent the continuation reaction of sample in stopple coupon again; thereby guarantee that institute's sample thief is consistent with sampling spot place composition, guarantee the accuracy of testing.The cooling water flow of this sampler is according to heat-resisting degree, sampling spot environment temperature, the chilled water caliber of the heat-resistance stainless steel metal of making stopple coupon, in guaranteeing the cooling water pipe pipe, determine under the unvaporized prerequisite of chilled water, and can regulate by changing velocity in pipes; The consumption of diluents--nitrogen is determined according to sampling object, stopple coupon caliber, nitrogen caliber, under the condition that satisfies isokinetic sampling's principle (promptly the compound sample of the gas of getting and the diluents flow velocity and the flow velocity of temperature flowing flue dust in stopple coupon consistent), can regulate by the gas flow rate that changes in the stopple coupon.

Claims

1, a kind of superfine particle sampler, comprise stopple coupon and cooling water channel, it is characterized in that: tube head (1) is positioned at the upper end of sampling core pipe (5), outer layer sleeve (2) is enclosed within outside the sampling core pipe (5), be provided with water inlet pipe (3) and the rising pipe (3 ') that is used to cool off between outer layer sleeve (2) and the sampling core pipe (5), the mouth of pipe of water inlet pipe (3) is positioned at the bottom of sampling core pipe (5), the mouth of pipe of rising pipe (3 ') is positioned at the upper end of sampling core pipe (5), be provided with two dilution tracheaes (6 between outer layer sleeve (2) and the sampling core pipe (5), 7), its gas outlet symmetry is positioned on the tube head (1); The cavity that tube head (1), sampling core pipe (5) and outer layer sleeve (2) form is the sealing shape.

2, sampler according to claim 1 is characterized in that: the distance (d1) between the mouth of pipe of rising pipe (3 ') and the tube head (1) is 3-8mm.

3, sampler according to claim 1 is characterized in that: the length (d2) that water inlet pipe (3) stretches into outer layer sleeve is 5-8mm.