CN105597434A - Filter screen for preventing and treating haze - Google Patents

Abstract

The invention discloses a filter screen. The filter screen comprises a frame, wherein at least six layers of net structures are fixed in the frame; a metal wire mesh support layer, a porous fiber layer, an activated carbon layer, a catalyst layer, a porous fiber layer and a metal wire mesh support layer are superposed on each net structure from inside to outside in sequence; the catalyst layer is composed of a powdered catalyst comprising a carrier, an active component and a co-catalyst. After haze air passes through the filter screen, the PM2.5 particles, nitric oxides and sulfur oxides are reduced to extremely low level, and thus air in cars is effectively purified and the health of respiratory systems of personnel in the cars is ensured.

Description

A kind of screen pack of preventing and treating haze

Technical field

The present invention relates to air purification field, be specifically related to a kind of screen pack of preventing and treating haze.

Background technology

Haze weather is a kind of atmosphere pollution state, and haze is to various suspended particulate substance content overproofs in atmosphereGeneral statement, especially PM2.5 (aerodynamics equivalent diameter is less than or equal to the particle of 2.5 microns)Be considered to cause " arch-criminal " of haze weather.

Mist is by the aerosol systems that is suspended in a large number small water droplet in surface air or ice crystal and forms. ManyComing across autumn and winter season, is the ground layer water in air vapour product of (or sublimating) that condenses. The existence meeting of mistReduce air transparency, visibility is worsened, if the horizontal visibility of object is reduced in 1000 meters,Just the weather phenomenon that is suspended in condensation vapor (or sublimating) thing in surface air is called to mist (Fog).

Haze, also claims the grains such as the airborne dust of gray haze (smog), sulfuric acid, nitric acid, organic carbon hydrogen compoundSon also can make atmosphere muddiness. The horizontal visibility of object is called gently in this phenomenon of 1000-10000 riceMist or mist (Mist). While forming mist, atmospheric humidity should be saturated (while existence if any a large amount of nuclei of condensation, relativelyHumidity not necessarily reach 100% just may occur saturated). Due to the light of the mist scattering of aqueous water or ice crystal compositionLittle with wavelength relationship, thereby mist seems to be creamy white or Bluish white and grey. Sulfur dioxide, nitrogen oxidationThing and pellet are the chief components of haze.

2013, " haze " became annual keyword. In the January of this year, 4 times haze process shrouds 30Individual province (district, city), in Beijing, only having 5 days is not haze sky. There is report to show, 500 of Largest In ChinaIn individual city, only reach the air quality standard of world health organisation recommendations less than 1% city, same therewithTime, polluting in the world 10 the most serious cities has 7 in China.

The harm that haze produces human body is as follows:

(1) impact on respiratory system

The constituent of haze is very complicated, comprises hundreds of Atmospheric Chemistry particulate matters. The master of being wherein harmful to healthIf the particulate that diameter is less than 10 microns, as mineral grain thing, sea salt, sulfate, nitrate,Organic aerosol particle, fuel and automobile exhaust gas etc., it can directly enter and stick to human respiratory tract and lungIn bubble. Especially submicron particle can be deposited on respectively in upper and lower respiratory tract and alveolar, causes acute rhinitisWith illnesss such as acute bronchitis. For bronchial astehma, chronic bronchitis, obstructive emphysema and slowThe chronic respiratory disease patients such as property obstructive disease of lung, haze weather can make state of an illness acute attack or acuteIncrease the weight of. If also can bring out lung cancer in this environment for a long time.

(2) impact on cardiovascular system

Haze sky is also very serious on the impact of human body cardiovascular and cerebrovascular disease, can hinder normal blood circulation, leadsCause cardiovascular disease, hypertension, coronary heart disease, cerebral hemorrhage, may bring out angina pectoris, miocardial infarction, heart failureExhaust etc., make chronic bronchitis occur cor pulmonale etc.

In addition, thick fog weather pressure ratio is lower, and people can produce a kind of sensation of agitation, and blood pressure can increase naturally to some extentHigh. On the one hand often temperature is lower the greasy weather again, some hypertension, patients with coronary heart disease from warm indoor suddenlyGo to the outdoor of cold, blood vessel expands with heat and contract with cold, and also can make blood pressure raise, and causes sending out of apoplexy, myocardial infarctionRaw. The careful reply so heart and brain blood patient must take medicine on time.

(3) haze weather also can cause that surface layer is ultraviolet to be weakened, and makes the work of airborne infectiousness germProperty strengthens, and infectious disease increases.

(4) be unfavorable for child growth. Because reduce sunshine in greasy weather, children's ultraviolet ray underexposure, dimension in bodyRaw plain D generates not enough, and the absorption of calcium is greatly reduced, and serious meeting causes Infant Rickets, children growthSlow down.

(5) affect mental health

Expert points out, continuing psychology and the health of large greasy weather on people has impact, says psychologically, greatly the greasy weatherCan cause oppressiveness, oppressive impression to people, can stimulate or aggravate the state of mental depression. In addition, due toThe weak and low pressure that causes of greasy weather light, it is slack, listless existing that some people can produce spirit in the greasy weatherResemble.

(6) affect fecundity

There are some researches show, long term exposure is in the airborne crowd of high density pollution, and its sperm is fertilized in vitroTime success rate may reduce. Between researcher has also found that poisonous air and male fecundity declineAssociation.

On November 5th, 2013, the Chinese Academy of Social Sciences, China Meteorological Administration combine issue " climate change is greenPi Shu: reply climate change report (2013) " point out, over nearly 50 years, Chinese haze weather is totally to increase andGesture. Wherein, mist number of days is obvious minimizing, and haze number of days obviously increases, and continuation haze process increases significantly.

At present, along with traffic congestion, people treat more and more for a long time in the various vehicles, due to vapourCar narrow space, it is subject to the impact of haze the hugest. Automobile, for the purification of air in car, is generally logicalCross screen pack and carry out adsorption filtration purification.

CN104043298A discloses a kind of automobile screen pack, includes housing, and establish at the top of described housingHave air inlet, the bottom of described housing is provided with air outlet, is provided with long filament non-woven filter cloth filter core in described housing,Described long filament non-woven filter cloth filter core forms by multilayer long filament non-woven filter cloth is stacked, it is characterized in that: described housingBelow inherent described long filament non-woven filter cloth filter core, be provided with layer of active carbon filter core, described active carbon filter core comprisesThe active carbon being wrapped in nonwoven.

The screen pack of prior art, is all by filtering or being used for of adsorbing purifies air, but airborneNitrogen oxide or oxysulfide but can not be by filtering or Adsorption.

Summary of the invention

The object of the invention is to propose a kind of screen pack of preventing and treating haze, this screen pack can purify haze skyGas, and by airborne sulfur and nitrogen oxides fast decoupled, effectively purifying in-vehicle air.

For reaching this object, the present invention by the following technical solutions:

Prevent and treat a screen pack for haze, described screen pack comprises frame, is fixed with at least 6 layers of net in frameShape structure, described network structure from inside to outside order is superimposed with woven wire supporting layer, porous fiber layer, workProperty charcoal layer, catalyst layer, porous fiber layer and woven wire supporting layer.

Described catalyst layer is made up of grained catalyst, and it comprises carrier, active component and co-catalyst.

Described carrier is zeolite, and Si/ in the skeleton structure of zeolite (Si+Al+P) mol ratio is 0.20.

Described active component is the mixture of titanium dioxide and cerium oxide, and the mol ratio of Ti and Sb is 4:3, andDescribed titanium dioxide is anatase crystal. The weight content of described active component in catalyst is0.3%-10%, preferably 0.5-%-8%, more preferably 2%-5%. For example, 0.8%, 1%, 1.5%, 2%, 2.5%,3％、3.5％、4％、4.5％、5％、5.5％、6％、6.5％、7％、7.5％。

Described co-catalyst is silver and di-iron trioxide, and the mol ratio of Ag and Fe is 2:5, described co-catalystWeight content in catalyst is 0.3%-6%, preferably 0.5%-5%. For example, 0.8%, 1%, 1.5%,2％、2.5％、3％、3.5％、4％、4.5％、5％、5.5％。

Preferably, the weight ratio of described active component and co-catalyst is 5:1～2:1. For example 4.5:1,4:1,3.5:1、3:1、2.5:1。

The preparation method of described catalyst can take conventional infusion process and other alternatives, this areaTechnical staff can freely select according to the prior art of its grasp, and the present invention repeats no more.

Screen pack of the present invention can be for the device of family expenses Steam central heating stove and other filtering gas.

The present invention is by choosing specific zeolite as carrier, and the Ti/Sb that chooses special ratios is as activityComposition, Ag/Fe, as co-catalyst, makes this catalyst produce cooperative effect. Be applied to screen packInterlayer, haze air is through after described screen pack, and PM2.5 particle, nitrogen oxide and oxysulfide all fallLow to extremely low-level, effectively purify air in car, protect occupant's respiratory health.

Detailed description of the invention

The present invention describes screen pack of the present invention by following embodiment.

Embodiment 1

Prepare catalyst by infusion process, carrier is zeolite, Si/ in the skeleton structure of zeolite (Si+Al+P)Mol ratio is 0.20, and active component is the mixture of titanium dioxide and cerium oxide, and the mol ratio of Ti and Sb is4:3, and described titanium dioxide is anatase crystal, the weight content of described active component in catalyst is5%, co-catalyst is silver and di-iron trioxide, and the mol ratio of Ag and Fe is 2:5, and described co-catalyst existsWeight content in catalyst is 2%.

Described screen pack comprises frame, is fixed with at least 6 layers of network structure in frame, described network structure fromIn be superimposed with woven wire supporting layer, porous fiber layer, active carbon layer, catalyst layer, porous to outer orderFibrage and woven wire supporting layer. Be test in 300 o'clock at PM2.5, described contaminated air is exhaled to approachThe speed of 1 meter per second of suction speed is by described screen pack, and test is through the air of filter screen processing, its PM2.5Value is 18, and the content of nitrogen oxide and oxysulfide all drops to below 0.1 milligram/cubic metre, is far smaller thanThe requirement of the IAQ standard that GB/T18883-2002 specifies.

Comparative example 1

The carrier of embodiment 1 is replaced with to active carbon, and all the other conditions are constant, and PM2.5 value is 52, nitrogen oxidationThe value of thing and oxysulfide is all higher than 1 milligram/cubic metre.

Comparative example 2

The Sb of embodiment 1 is replaced with to La, and all the other conditions are constant, and PM2.5 value is 49, nitrogen oxide andThe value of oxysulfide is all higher than 1 milligram/cubic metre.

Comparative example 3

The Fe of embodiment 1 is replaced with to Co, and all the other conditions are constant, and PM2.5 value is 36, nitrogen oxide andThe value of oxysulfide is all higher than 1 milligram/cubic metre.

Above-described embodiment and comparative example explanation, between several components of catalyst that screen pack of the present invention adoptsThere is specific contact, omit or replace wherein one or more, all can not reach the application's certain effects,Prove that it has produced cooperative effect.

Applicant's statement, the present invention illustrates screen pack of the present invention by above-described embodiment, but the present invention is alsoBe not limited to above-mentioned screen pack, do not mean that the present invention must rely on above-mentioned detailed catalysts and filter screen abilityImplement. Person of ordinary skill in the field should understand, any improvement in the present invention is produced the present inventionThe selections of the equivalence replacement of the each raw material of product and the interpolation of auxiliary element, concrete mode etc., all drop on of the present inventionWithin protection domain and open scope.

Claims (5)

1. prevent and treat a screen pack for haze, described screen pack comprises frame, is fixed with at least 6 layers in frameNetwork structure, described network structure from inside to outside order be superimposed with woven wire supporting layer, porous fiber layer,Active carbon layer, catalyst layer, porous fiber layer and woven wire supporting layer, described catalyst layer is urged by powderyAgent composition, it comprises carrier, active component and co-catalyst, it is characterized in that,

Described carrier is zeolite, and Si/ in the skeleton structure of zeolite (Si+Al+P) mol ratio is 0.20;

Described active component is the mixture of titanium dioxide and cerium oxide, and the mol ratio of Ti and Sb is 4:3, andDescribed titanium dioxide is anatase crystal, and the weight content of described active component in catalyst is0.3％-10％；

Described co-catalyst is silver and di-iron trioxide, and the mol ratio of Ag and Fe is 2:5, described co-catalystWeight content in catalyst is 0.3%-6%.

2. screen pack as claimed in claim 1, is characterized in that, described active component is in catalystWeight content is 0.5-%-8%.

3. screen pack as claimed in claim 2, is characterized in that, described active component is in catalystWeight content is 2%-5%.

4. screen pack as claimed in claim 1, is characterized in that, described co-catalyst is in catalystWeight content is 0.5%-5%.

5. screen pack as claimed in claim 1, is characterized in that, described active component and co-catalystWeight ratio is 5:1～2:1.