Air purification method

Abstract

The invention discloses an air purification method. The air purification method comprises the steps as follows: a), air to be purified is subjected to adiabatic compression in a compressor, and the temperature of the air is raised to the activation temperature of a catalyst in subsequent catalytic reaction; b), the compressed air enters a catalytic cleaner, and harmful substances in the air change into harmless gases under the action of the catalyst; and c), the purified air which is processed by the catalytic cleaner is fed into an expansion machine for adiabatic expansion, so that the air is cooled. After the air to be purified is subjected to adiabatic compression by the compressor, the air temperature is 50-400 DEG C, the pressure is 0.4-0.8MPa, and the volume compression ratio is 3-6. The catalyst in the catalytic cleaner can be one or more of a PM2.5 honeycomb ceramic particle trapping filter, an ozone catalytic purification agent, a volatile organic chemicals (VOCs) catalytic purification agent, a carbonic oxide (CO) catalytic purification agent, a NOx catalytic purification agent and a SOx trapping cleaning agent. According to the air purification method, the harmful substances in the air can be effectively removed, the indoor air quality is improved, and the energy can be saved remarkably.

Description

technical field [0001] The invention relates to a purification method, in particular to an air purification method. Background technique [0002] my country's air pollution is becoming more and more serious, and the air quality in urban areas, especially large cities, is deteriorating, especially the content of PM2. Times or even several times, the indoor air quality of urban buildings in my country is deteriorating, seriously endangering the life and health of the broad masses of the people. [0003] The main harmful substances in the air are: PM2.5, nitrogen oxides (NOx), sulfur oxides (SOx), carbon monoxide (CO), ozone (O3), volatile organic compounds VOCs, etc. [0004] Now indoor air quality and indoor air pollution control and governance are getting more and more attention, the main reasons are: [0005] (1) People spend about 85-90% of their time indoors every day, the air they breathe mainly comes directly from indoors, and the opportunities and time to contact indo...

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Problems solved by technology

[0007] (3) In order to save energy, the airtightness of modern buildings has increased. Due to the imperfect ventilation facilities of the central air-conditioning system, indoor pollutants cannot be discharged outdoors in time, resulting in the deterioration of indoor air quality.

[0009] (1) Filtration method, which can only filter out large particles in the air, but cannot remove harmful substances such as volatile organic compounds, nitrogen oxides, sulfur oxides, and carbon monoxide in the air;

[0010] (2) Adsorption method, which mainly uses porous adsorption materials such as porous silica, activated carbon, activated alumina, ceramics or zeolite to adsorb and remove harmful substances in the air, but this method usually requires different methods for different harmful substances. Therefore, it is difficult to realize the comprehensive purification of indoor air in the true sense. Although activated carbon adsorbents can adsorb most harmful substances, due to their limited adsorption capacity, the adsorbents need to be regenerated frequently, especially when activated carbon is effective at temperatures above 573K. The possibility of spontaneous combustion causes considerable difficulty in regeneration and limits its application

[0011] (3) Photocatalytic oxidation method, which uses the photocatalytic activity of the catalyst to cause redox reactions of VOCs adsorbed on the surface of the catalytic medium, and finally converts them into carbon dioxide, water and small inorganic molecules. Due to the low price of TiO2 and the wide range of sources , has high absorption rate of ultraviolet light, high photocorrosion resistance, chemical stability and catalytic activity, and is non-toxic, and has a strong adsorption effect on many organic substances, so it has become the most commonly used photocatalyst. The main advantages of photocatalytic oxidation are : High energy utilization rate, usually operated at room temperature, no by-products formed, the used catalyst can be regenerated by physical and chemical methods and recycled, but this method can only degrade volatile organic compounds, and cannot remove nitrogen oxides and sulfur Harmful substances such as oxides

[0012] At present, the air treatment and purification technologies on the market are basically unable to fully and effectively purify the pollutants in the air, and fully meet the requirements of indoor air quality standards. It is urgent to develop methods that can comprehensively and effectively purify indoor air.

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