CN101530716A

CN101530716A - Method for purifying air

Info

Publication number: CN101530716A
Application number: CN200910079756A
Authority: CN
Inventors: 李进军; 郝郑平; 梁燕; 何炽; 胡琴; 田华; 豆宝娟; 麻春艳
Original assignee: Research Center for Eco Environmental Sciences of CAS
Current assignee: Research Center for Eco Environmental Sciences of CAS
Priority date: 2009-03-11
Filing date: 2009-03-11
Publication date: 2009-09-16
Anticipated expiration: 2029-03-11
Also published as: CN101530716B

Abstract

The invention relates to a method for removing carbon monoxide or volatile organic contaminants, which is realized by contacting polluted air with filler contained in a reactor. The filler of the reactor is porous graphitizing carbon or porous silicon carbide or porous graphitizing carbon or porous silicon carbide which is loaded with reactive metal components; the filler is used as adsorbent or oxidation catalyst and is heated up by accessing to electric current to realize regeneration of the adsorbent or activation of the catalyst. The method of the invention is applicable to removal of the carbon monoxide and the volatile organic contaminant discharged by households, cars or industrial polluting sources and has the advantages of safety and energy saving.

Description

A kind of air purification method

Technical field

The invention belongs to the pollution control technology field, particularly belong to the air pollution control technique field.

Background technology

Volatile organic matter and carbon monoxide are the important pollutants that causes room air pollution, compartment air pollution and atmosphere pollution, and absorption and catalysis are to handle this two pollutant two kinds of technology commonly used.For adsorption technology, active carbon is the most frequently used adsorbent.Acticarbon hot blast stripping regeneration commonly used, but because the active carbon ignition point is low, often causes in the hot blast stripping process and catch fire.Simultaneously, in the hot blast stripping process, need exogenous heat source for heating air to higher temperature, the temperature of working off one's feeling vent one's spleen is than higher, and rate of energy is often lower.For the catalytic purification method, also need with exogenous thermal source with catalytic bed or the air heat that contains pollutant to higher temperature the same relatively problem of power consumption that exists.The ignition point of graphite and carborundum is than higher, and electric conductivity is better.In the present invention, porous graphite carbon and porous silicon carbide are used to the absorption or the catalytic oxidation of volatile organic matter, and the characteristics of utilizing this two classes material to conduct electricity, it is heated up realize the regeneration of adsorbent or the activation of catalyst, have safety and energy-saving advantages by directly in this two classes material, feeding electric current.

Summary of the invention

The invention provides a kind of room air, compartment air or the volatile organic matter of industrial source discharging or technology and method of carbon monoxide pollution thing eliminated, the filler with electric conductivity in its core is contaminated air and is seated in reactor contacts and realizes purifying, employed filler is porous graphite carbon or porous silicon carbide adsorbent, or the metallic catalyst of porous graphite carbon or porous silicon carbide load, by being heated up, the filler energising realizes the regeneration of adsorbent or the activation of catalyst.

Operating process is as follows:

The electrode of two or more power supplys is placed in the reactor.Filling porous graphitized carbon or porous silicon carbide material in the space between electrode, the catalyst of perhaps filling porous graphitized carbon or porous silicon carbide load.Before the reactor air inlet, connect air mobilization dynamic system.

Can realize the purification of contaminated air by adsorption process or catalytic process.

In adsorption process, disconnect earlier being connected between electrode and the power supply, keep reactor to be in room temperature state, by air mobilization dynamic system, the contaminated air that will contain volatile organic matter or carbon monoxide passes reactor, and volatile organic matter is adsorbed on the porous aggregate.Adsorb saturated after, with wireway the port of export of reactor is connected to outdoorly, perhaps be connected to destroy devices such as incinerator, then with electrode and power connection, the filler energising is heated up, realize its regeneration.

In catalytic process,, the catalyst filling energising is heated up with electrode and power connection, the activation of realization catalyst, by air mobilization dynamic system, the contaminated air that will contain volatile organic matter or carbon monoxide passes reactor, oxidation reaction takes place on the filler catalyst and eliminates.

Aforesaid method, the ignition point of porous graphite carbon is more than 350 ℃.

Aforesaid method, catalyst activity component are one or several the combination in platinum, palladium, gold, silver, cobalt, copper, manganese, chromium, iron, titanium, zirconium, cerium, lanthanum, tungsten, vanadium, tin, the molybdenum.

Aforesaid method, the catalysqt deactivation for steam absorption at a lower temperature causes can heat up by energising and realize catalyst regeneration.

Aforesaid method, volatile organic matter refer to formaldehyde, acetaldehyde, acetone, butanone, chlorobenzene, chloro ethene, chloric ethane, chloromethane, benzene,toluene,xylene, trimethylbenzene, naphthalene, ether, methyl ether, methyl alcohol, ethanol, propyl alcohol, butanols, amylalcohol.

Aforesaid method, power supply can be dc source or AC power.

Description of drawings

Fig. 1 is the air cleaning flow chart

The specific embodiment

Embodiment 1

Purification process as shown in Figure 1.Filling porous graphitized carbon adsorbent in the reactor (specific area 370 meters squared per gram, 0.5 milliliter/gram of pore volume, granular size 40-60 order), loadings is 500 milliliters.Airborne pollutant is a toluene, about 200 milligrams/cubic metre of concentration.The blower air dynamical system makes contaminated air feed reactor with 5 liters/minute speed, and within 10 days, toluene concentration is no more than 0.2 milligram/cubic metre in working off one's feeling vent one's spleen.After 10 days, the reactor outlet end is connected to outdoor, perhaps links to each other, and start the blower air dynamical system, to certain voltage, make the energising of porous graphite carbon adsorbent be warming up to 120 ℃ power adjustment, can realize its regeneration in 15 minutes with incinerator.

Embodiment 2

Purification process as shown in Figure 1.The palladium catalyst (specific area 140 meters squared per gram, granular size 40-60 order) of filling porous carborundum load in the reactor, loadings is 500 milliliters.Airborne pollutant is a benzene, about 260 milligrams/cubic metre of concentration.With power adjustment to certain voltage, make porous silicon carbide energising be warming up to 210 ℃, open the blower air dynamical system, make contaminated air pump into reactor with 5 liters/minute speed, contact with catalyst and destroyed by catalysis, the concentration of benzene is no more than 0.1 milligram/cubic metre in working off one's feeling vent one's spleen.

Claims

1. method of removing airborne volatile organic matter and carbon monoxide pollution thing, its two indispensable essential characteristics that have are:

(1) the contaminated air filler interior with being seated in reactor contacts and realizes purifying, filler in the reactor is conductive porous graphite carbon or porous silicon carbide, perhaps load the porous graphite carbon or the porous silicon carbide of catalyst, filler be used for absorption or the catalytic oxidation pollutant;

(2) by feeding electric current in filler it is heated up and realize the regeneration of adsorbent or the activation of catalyst.

2. the method for claim 1, the ignition point that it is characterized in that porous graphite carbon is more than 350 ℃.

3. the method for claim 1 is characterized in that the catalyst activity component is one or several the combination in platinum, palladium, gold, silver, cobalt, copper, manganese, chromium, iron, titanium, zirconium, cerium, lanthanum, tungsten, vanadium, tin, the molybdenum.

4. as claim 1 and 3 described methods, it is characterized in that the catalysqt deactivation for steam absorption at a lower temperature causes can heat up by energising and realize catalyst regeneration.

5. the method for claim 1 is characterized in that volatile organic matter refers to formaldehyde, acetaldehyde, acetone, butanone, chlorobenzene, chloro ethene, chloric ethane, chloromethane, benzene,toluene,xylene, trimethylbenzene, naphthalene, ether, methyl ether, methyl alcohol, ethanol, propyl alcohol, butanols, amylalcohol.