CN1317490C

CN1317490C - Automobile emission inhalable particulate matter removing device

Info

Publication number: CN1317490C
Application number: CNB200410101816XA
Authority: CN
Inventors: 杨瑞昌; 周涛; 赵磊; 刘若雷
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2004-12-24
Filing date: 2004-12-24
Publication date: 2007-05-23
Anticipated expiration: 2024-12-24
Also published as: CN1632294A

Abstract

The present invention relates to a removing device of sniffable particles in automobile tail gas, which belongs to removing devices of ultra-fine particles in the automobile tail gas. The device is composed of a group of thermophoresis working sections distributed in parallel, an upper cascade box and a lower cascade box, wherein the thermophoresis working sections are arranged between the upper cascade box and the lower cascade box, and the same side surface of each cascade box is respectively communicated with the inlets and the outlets of the parallel thermophoresis working sections at the adjacent two stages. The pipe walls of the thermophoresis working sections are cooled down by cold air outside an automobile, and sniffable particles contained in the tail gas generate thermophoresis effect by the action of temperature difference and are deposited on the inner wall surfaces of the pipes of the thermophoresis working sections. The removing device uses flowing effect insufficiently developed to continuously increase thermophoresis depositing efficiency in links under the action of the thermophoresis effect, and finally, high total depositing efficiency is achieved. The removing device has the advantages of low cost and operating cost, convenient enforcement and simple control, and is capable of efficiently removing the sniffable particles under different installation conditions.

Description

A kind of automobile emission inhalable particulate matter removing device

Technical field

The present invention relates to a kind of device that removes of automobile emission inhalable particulate matter, specifically, be to utilize the outer cool air of automobile that the tube wall by tail gas is cooled off, contained pellet is subjected to the thermophoretic effect that the temperature difference effect produces in the tail gas, the internal face of work pipeline section will be deposited on, realization removes a kind of new device of pellet in the vehicle exhaust, belongs to purifying vehicle exhaust or dedusting technology field.

Background technique

Increasing along with the big city automobile, the pellet in the vehicle exhaust (PM2.5) has risen becomes one of main environmental pollution source.It removes also becomes an international headache.More existing exhaust purifiers adopt suction-operateds or chemical principle to remove harmful gas in the tail gas, but it is also rare to remove the device of pellet in the tail gas (PM2.5).The thermophoresis phenomenon is the heat subject of studying in the world.Be included in the pellet (PM2.5) in the air-flow of higher temperature, when in the lower pipeline of wall surface temperature, flowing, be subjected to the thermophoretic effect effect, can move to the low direction of temperature, and be deposited on the cold wall.According to present external experiment and theoretical study results, the thermophoresis deposition efficiency that causes by thermophoretic effect has only 20%～30% merely.The thermophoresis deposition efficiency is lower, is because thermophoretic forces is a short range force, only just plays a role near the boundary layer.And there are some researches show, when common pipe length when 2m is above, the thermophoresis deposition efficiency just stops to increase.And to keep the lower temperature of wall, and must be furnished with relevant cooling system, increased the complexity and the operating cost of system.So, the also rarely seen report of the deduster that utilizes thermophoretic effect to make.Unique see be, the Byung Uk Lee of Korea S in 2002 and Sang Soo Kim have carried out experimental research (Byung UK Lee to a kind of impactor that the trap particles of cold pressing plate is housed, Sang Soo Kim. (2003) .New type ofimpactor with a cooled impaction plate for capturing PM2.5 and other aerosols.Journal of Aerosol Science. (34) 95 technical order 7-967), they utilize inertial collision and the thermophoresis effect of particle to cold copper pressing plate, and on the copper pressing plate, be coated with butter, under the turbulent flow situation, total deposition efficiency is reached more than 50%.But this method is very complicated, is difficult to be applied to engineering reality, especially is difficult to be applied to remove the pellet in the vehicle exhaust.

Summary of the invention

The purpose of this invention is to provide a kind of new device that utilizes the thermophoresis principle to realize removing the pellet in the vehicle exhaust, promptly develop a kind of simple in structure, removal efficiency is high, stable performance, be specially adapted for removing the dust removal apparatus of the ultra-fine grain in the vehicle exhaust.

Purpose of the present invention is achieved through the following technical solutions: it is characterized in that: this device is made up of one group of thermophoresis active section that is arranged in parallel and the superior and the subordinate's header; Described thermophoresis active section is arranged between the superior and the subordinate's header, and the import and export of the thermophoresis active section that the same side of each header is parallel with adjacent two-stage respectively are connected; Every grade of thermophoresis active section is 1～4, and the length of described thermophoresis active section is 0.5～2m, and its pipe inner diameter is 2～5cm.

The present invention compared with prior art, have the following advantages and the high-lighting effect: automobile provided by the invention thermophoresis dust removal apparatus, be to utilize the thermophoresis principle that pellet is removed, tube wall is cooled off in the pipe outer air relative movement that promptly utilizes the speed of a motor vehicle to cause, not the additive decrementation energy source and power.The automobile deduster is mainly handled harmful gas in the tail gas at present, and is little to removing the fine grained effect.External experiment shows that the thermophoresis deposition efficiency that is caused by thermophoretic effect has only 20%～30% merely.And by device provided by the invention, utilizing flow following thermophoretic effect raising thermophoresis deposition efficiency of multistage non-fully developed, removal efficiency can reach 70%～90%.And implement conveniently, cheap, reliable performance, operating cost are extremely low.Can use effectively on all kinds of automobiles, outstanding effect be arranged administering the environmental pollution that causes by the motor vehicle exhaust emission pellet.Has vast market prospect.

Description of drawings

Fig. 1 is the structural representation of automobile emission inhalable particulate matter removing device.

Fig. 2 is the right elevation of Fig. 1.

Embodiment

Below in conjunction with accompanying drawing concrete structure of the present invention, working procedure and preferred forms are described further.

Fig. 1 is the structural representation of automobile emission inhalable particulate matter removing device provided by the invention.This device is made up of one group of thermophoresis active section 1 that is arranged in parallel and upper and lower level header 2; Described thermophoresis active section is arranged between the superior and the subordinate's header, and the import and export of the thermophoresis active section that the same side of each header is parallel with adjacent two-stage respectively are connected; Thermophoresis active section outer wall is cooled off by cool air, to keep its tube wall lower wall temperature is arranged, and the pellet in the high-temperature tail gas in the pipe will be in thermophoresis effect deposit in the wall of thermophoresis work pipeline section.The tail gas that contains pellet enters first order thermophoresis active section, and the air cooling wall between the temperature difference effect under, pellet is deposited on the tube wall face according to the thermophoresis rule, behind the upper level header, enters next stage thermophoresis deposition pipeline section again and continues deposition; The rest may be inferred, through multistage thermophoresis deposition pipeline section, reaches higher deposition efficiency.Header can play the effect that changes the tail gas flow field, and making tail gas stream is non-fully developed stream, improves the thermophoresis deposition efficiency, utilizes turbulent flow simultaneously, improves total deposition efficiency.This device can be dissimilar automobiles and removes pellet efficiently.This device be furnished with dual mode: one, thermophoresis work pipeline section is consistent with the motor racing direction, stream is following current and adverse current move toward one another in pipe outer space air-flow and the pipe; Its two, thermophoresis work pipeline section is vertical with the motor racing direction, stream is distributary moving direction in pipe outer space air-flow and the pipe.In addition, have mother's with lock ash removing opening 3 on the another side of header, this ash removing opening is corresponding with the import and export of thermophoresis active section, so that regularly open locknut, uses cleaning brush and feeds clean air and remove the pellet that deposits on the active section internal face.Feeding the pellet of clean air under will cleaning then is blown into filter bag and collects.

Thermophoresis work pipeline section of the present invention and header all adopt metal to make, and the length of each grade thermophoresis work pipeline section is generally 0.5～2m, adopt single tube, and according to the automobile of different air displacemenies, its pipe inner diameter is 2～5cm.Active section quantity summations at different levels are for being generally 4～10 sections.Consider the exhaust flow of dissimilar automobiles, the quantity of each grade thermophoresis work pipeline section 1 can be 1～4.The arrangement mode of thermophoresis work pipeline section adopts in-line arrangement or fork to arrange two types, the preferred fork row structure of using.Thermophoresis work pipeline section and header can adopt argon arc welding or screw thread to add the refractory seal pad to be connected.

Claims

1. automobile emission inhalable particulate matter removing device, it is characterized in that: this device is made up of one group of thermophoresis active section (1) that is arranged in parallel and the superior and the subordinate's header (2); Described thermophoresis active section is arranged between the superior and the subordinate's header, and the import and export of the thermophoresis active section that the same side of each header is parallel with adjacent two-stage respectively are connected; Every grade of thermophoresis active section is 1～4, and the length of described thermophoresis active section is 0.5～2m, and its pipe inner diameter is 2～5cm.

2. according to the described automobile emission inhalable particulate matter removing device of claim 1, it is characterized in that: have mother's with lock ash removing opening (3) on the another side of header, this ash removing opening is corresponding with the import and export of thermophoresis active section.