CN101513586B

CN101513586B - Reactor for eliminating oil smoke and foreign odor thereof

Info

Publication number: CN101513586B
Application number: CN2009101032865A
Authority: CN
Inventors: 王晓静; 周波
Original assignee: Chongqing University
Current assignee: Chongqing University
Priority date: 2009-02-27
Filing date: 2009-02-27
Publication date: 2011-07-06
Anticipated expiration: 2029-02-27
Also published as: CN101513586A

Abstract

The present invention relates to the technical field of smoke exhauster, and particularly relates to a reactor which is used for eliminating oil smoke and foreign odor with low-temperature plasma. The reactor comprises a discharging tube which is internally provided with a long electrode which extends along the length direction of discharging tube. The long electrode is connected with an alternating current power source. The frequency of alternating current power source is larger than 20kHz. The discharging tube is externally provided with a cathode which surrounds the discharging tube. Two ends of discharging tube are respectively installed with a smoke inlet and a smoke outlet which are communicated with the inner chamber of discharging tube. According to the invention, large number of high-energy electrons are generated in the discharging process. The ionization, decomposition and inspiration reactions occur in the process when the high-energy electrons collide with the gas molecule. The active particles with high activity are generated. The high-energy electrons and active particles participate the plasma chemical reaction directly or indirectly thereby degrading the organic matter in the oil smoke. The volatile organic substance in the oil smoke can basically degraded thereby eliminating the oil smoke and foreign odor thereof.

Description

Remove the reactor of oil smoke mist and peculiar smell thereof

Technical field

The present invention relates to the smoke exhaust ventilator technical field, particularly a kind of low temperature plasma is removed the reactor of oil smoke mist and peculiar smell thereof.

Background technology

In gastronomical process, a series of complicated variations take place in edible oil and food under hot conditions, produce a large amount of thermal oxide catabolites, are dispersed into air with oil smoke mist form, comprise organic substances such as fat hydrocarbon, PAH, hydrocarbon, aldehyde, ketone, alcohol.These organic substances not only distribute the excitant peculiar smell, and health is also had very big harm.Studies show that in recent years, the cooking fume mist has genetoxic, immunotoxicity, lungs toxicity and potential carcinogenic mutagenicity to body, and respiratory tract is had the intense stimulus effect.In addition, the mutagenicity of cooking fume mist has the trend that raises and strengthen with temperature.Special in the area with high-temperature cooking traditional habit, the oil smoke mist pollutes very serious.

Existing corona is removed the reactor of oil smoke mist, utilize corona to make gas ionization, and then after making smoke particle charged, being collected device under the electric field force effect collects, as publication number is the high-voltage pulse generator electrode structure of the disclosed a kind of electro-deposition formula lampblack absorber of Chinese utility application specification of CN 2681825Y, and for example publication number is disclosed a kind of corona moisture film fume purifying method of Chinese invention patent ublic specification of application and the device of CN1879973A, in the middle of comprising, it is inserted with the dust collecting pole plate pipe of corona polar filament, the dust collecting pole plate pipe connects anodal, the corona polar filament connects negative pole, water flows in the dust collecting pole plate pipe along the corona polar filament, water forms electronegative spraying liquid particulate under effect of electric field, by electric field and liquid particulate soot particles is carried out being collected in the dust collecting pole plate tube-surface after the charged seizure, form moisture film, the moisture film that has a dirt under the effect of gravity with the dirt band from the dust collecting pole plate pipe.But these devices of the prior art all adopt physical method, do not change the oil smoke component, so the peculiar smell of oil smoke mist still exists, existing reaction unit is adhered to by dirt easily simultaneously, need often clean, and influences operating efficiency and cost.

Summary of the invention

In view of this,, the invention provides a kind of reactor of removing oil smoke mist and peculiar smell thereof, can make the organic substance degraded in the oil smoke mist, remove oil smoke mist and peculiar smell thereof in order to address the above problem.

The object of the present invention is achieved like this, remove the reactor of oil smoke mist and peculiar smell thereof, comprise a discharge tube, be provided with the long electrode that extends along the discharge tube length direction in the described discharge tube, described long electrode is used for being connected with the AC power of frequency greater than 20kHz, and described discharge tube is outside equipped with the negative electrode that surrounds discharge tube; The two ends of described discharge tube are respectively arranged with gas approach and the exhanst gas outlet that is communicated with the discharge tube inner chamber.

Further, described negative electrode is the wire netting of parcel discharge tube;

Further, the material of described discharge tube is glass, polytetrafluoroethylene (PTFE) or aluminium oxide;

Further, described AC power adopts high-frequency ac power or bipolar pulse power supply;

Further, described long electrode is the electrode bar of band prickle;

Further, long prickle and short prickle are set at interval on the described electrode bar;

Further, described electrode bar is coaxial with discharge tube, and the length of described long prickle is more than or equal to 1/2L and less than L, and the length of described short prickle is greater than 1/3L and less than 1/2L, and described L is electrode bar surface and discharge tube inwall distance radially;

Further, the spacing of adjacent long prickle and short prickle is 3.3: 1 with the ratio of long prickle length, and the voltage of described AC power is 3.7kV, and frequency is 25kHz.

The reactor of removal oil smoke mist of the present invention and peculiar smell thereof, the discharge type that adopts corona discharge to combine with dielectric barrier discharge, produce a large amount of high energy electrons in the discharge process, in the process of high energy electron and gas molecule collision, ionization can take place, decompose and provocative reaction, form the active particle of high activity, these high energy electrons and active particle participate in plasma chemical reaction directly or indirectly, thereby make organic matter degradation in the oil smoke, volatile organic matter in the basic degradable oil smoke mist, thereby remove oil smoke mist and taste thereof, thereby reach than the better effect of removal oil smoke mist reactor of the prior art: the purification efficiency that significantly improves the oil smoke mist, reduce the frequency of cleaning reaction device greatly, remove the peculiar smell of oil smoke mist significantly.

Other advantages of the present invention, target, to set forth in the following description to a certain extent with feature, and to a certain extent,, perhaps can obtain instruction from the practice of the present invention based on being conspicuous to those skilled in the art to investigating hereinafter.Target of the present invention and other advantages can be passed through following specification, claims, and the specifically noted structure realizes and obtains in the accompanying drawing.

Description of drawings

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing:

Fig. 1 shows the structural representation of the reactor preferred embodiment of removing oil smoke mist and peculiar smell thereof;

Fig. 2 shows the structural representation of discharge tube in the preferred embodiment, negative electrode and anode.

The specific embodiment

Below will be described in detail the preferred embodiments of the present invention.

Referring to Fig. 1, Fig. 2, the removal oil smoke mist of present embodiment and the reactor of peculiar smell thereof, comprise a discharge tube 1, be provided with the long electrode 2 that extends along the discharge tube length direction in the described discharge tube 1, described long electrode 2 is by insulated end cover 4 and discharge tube 1 coaxial setting, described long electrode 2 comprises long prickle 21 and the short prickle 22 that is provided with at interval on electrode bar 23 and the electrode bar 23, the length of described long prickle 21 is more than or equal to 1/2L and less than L, the length of described short prickle 21 is greater than 1/3L and less than 1/2L, and described L is electrode bar 23 surfaces and discharge tube 1 inwall distance radially; The outside face of described discharge tube 1 is coated with wire netting 3; The two ends of described discharge tube 1 are respectively arranged with gas approach 5 and the exhanst gas outlet 6 that is communicated with discharge tube 1 inner chamber.

But material adopting quartz glass, polytetrafluoroethylene (PTFE) or the aluminium oxide etc. of described discharge tube 1 have the dielectric of high strength, high density, high insulativity, high-k, high evenness.

Described long electrode 2 is electrically connected with high-frequency ac power or bipolar pulse power supply as anode, and the frequency that described power frequency supply or bipolar pulse power supply are electrically connected should be greater than 20kHz; Described wire netting 3 ground connection are as negative electrode.

According to result of the test, when the ratio of the spacing of adjacent long prickle 21 and short prickle 22 and long prickle 21 length is 3.3: 1, the voltage of AC power is 3.7kV, when frequency is 25kHz, the removal efficient of the reactor of removal oil smoke mist of the present invention and peculiar smell thereof is 67%, this moment, energy efficiency reached nearly 4.2g/kWh, and energy efficiency is the highest.

Behind applied voltage, because the internal electric field distribution is very inhomogeneous, corona discharge at first takes place at long prickle place, the corona layer can be diffused into the discharge space of whole reactor then.Because dielectric existence, micro discharge is distributed in the whole discharge space uniformly and stably, obtain the low temperature nonequilibrium plasma of large volume, corona discharge combines with the quartz glass dielectric barrier discharge, produce a large amount of high energy electrons in the discharge process, its Energy distribution is being 2-20eV, and maximum Energy distribution probability is between 2-12eV.In the process of high energy electron and gas molecule collision, ionization, decomposition and provocative reaction can take place, form the active particle of high activity.Contain N in the background air that participates in the discharge process reacting ₂, O ₂With the water vapour H in the oil smoke ₂O, they become excitation state by ground state in discharge process, generated the high energy oxygen atom of excitation state, as O ³(P), O ³And N, N (D), ₂ ^*, OH, O3, H, O isoreactivity group.These high energy electrons, energetic atom and active group all participate in plasma chemical reaction directly or indirectly, thereby make organic matter degradation in the oil smoke, generate CO, CO ₂, inorganic matter and organic matters such as NOx.Process for the alkane in the oil smoke, the degraded of olefines organic compound may be: free radical is captured the hydrogen atom in the alkyl earlier and is made it hydroxylating, then progressively carries out deep oxidation again, and finally making organic matter degradation is CO ₂And H ₂O; For alkene, free radical or its unsaturated double-bond of electronics directtissima through behind the epoxidation, make it hydroxylating again and degrade; PAH is under the nonequilibrium plasma effect, and the substitution reaction of free radical elder generation and phenyl ring or phenyl ring finally causes the open loop degraded, the volatile organic matter in the basic degradable oil smoke mist, thereby the taste of removal oil smoke mist.

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims

1. remove the reactor of oil smoke mist and peculiar smell thereof, it is characterized in that: comprise a discharge tube (1), be provided with the long electrode (2) that extends along the discharge tube length direction in the described discharge tube (1), described long electrode (2) is used for being connected with AC power, and described discharge tube (1) is outside equipped with the negative electrode (3) that surrounds discharge tube (1); The two ends of described discharge tube (1) are respectively arranged with gas approach (5) and the exhanst gas outlet (6) that is communicated with discharge tube (1) inner chamber; Described long electrode (2) is the electrode bar (23) of band prickle, described prickle comprises long prickle (21) and short prickle (22), long prickle (21) and short prickle (22) are arranged on the electrode bar (23) at interval, described electrode bar (23) is coaxial with discharge tube (1), the length of described long prickle (21) is more than or equal to 1/2L and less than L, the length of described short prickle (21) is greater than 1/3L and less than 1/2L, and described L is electrode bar (23) surface and discharge tube (1) inwall distance radially; The spacing of adjacent long prickle (21) and short prickle (22) is 3.3: 1 with the ratio of long prickle (21) length, and the voltage of described AC power is 3.7kV, and frequency is 25kHz.

2. the reactor of removal oil smoke mist as claimed in claim 1 and peculiar smell thereof is characterized in that: described negative electrode (3) is the wire netting of parcel discharge tube (1).

3. the reactor of removal oil smoke mist as claimed in claim 1 and peculiar smell thereof is characterized in that: the material of described discharge tube (1) is glass, polytetrafluoroethylene (PTFE) or aluminium oxide.

4. the reactor of removal oil smoke mist as claimed in claim 1 and peculiar smell thereof is characterized in that: described AC power adopts high-frequency ac power or bipolar pulse power supply.