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Ⅰ. Source of Printing Waste Gas
Solvent-based printing inks are widely used in the printing industry, containing 50%-60% volatile components. Thinners for adjusting ink viscosity further increase organic gas emissions. During the drying process of printed products, 70%-80% of volatile substances in the ink evaporate, generating organic gases such as ethanol, ethyl acetate, butyl acetate, propyl acetate, toluene and xylene. These emissions cause great harm to the surrounding environment and human health.
Ⅱ. Characteristics of Printing Waste Gas
1. A small amount of ink waste gas is volatilized during the printing process. It is mainly composed of low-grade hydrocarbons without harmful components such as benzene and toluene. The emission is calculated as 10% of the ink consumption. The waste gas generated by common ink is mostly non-methane total hydrocarbons volatilized from ink thinners.
2. Carbon black is regarded as the key pollution indicator for dust contained in ink. PM10 shall be taken into consideration during treatment. For oil-based ink, organic solvents are completely volatilized in different time periods during application.
3. Compared with solvent-based ink, offset printing ink contains fewer organic solvents with lower volatile capacity and less environmental pollution. Most offset paper inks adopt oxidative conjunctival drying, while UV offset inks adopt ultraviolet curing drying, resulting in extremely low pollutant discharge.
Ⅲ. Printing Waste Gas Treatment Solutions
(1) Activated Carbon Adsorption Solution
After entering the adsorption box, printing waste gas passes through the activated carbon adsorption layer. Unbalanced molecular attraction and chemical bonding force exist on the activated carbon surface. When the adsorbent contacts with waste gas, gas molecules are attracted and gathered on the solid surface, which is defined as adsorption. Relying on the adsorption capacity of porous activated carbon with large specific surface area, pollutants in waste gas are trapped and separated from the gas mixture. The purified gas is discharged at high altitude.
1. Technical Characteristics
(1) High adsorption efficiency and strong adsorption capacity.
(2) Capable of treating multiple mixed organic waste gases simultaneously with high purification efficiency.
(3) Small floor area, simple maintenance and low operating cost.
(4) Strong adaptability. The fully sealed structure is applicable both indoors and outdoors with a wide application range.
(5) Adopting automatic control design for simple and safe operation.
2. Application Scope
Activated carbon adsorption technology is widely used for low-concentration and high-air-volume waste gas treatment in industries such as petroleum, chemical industry, rubber, coating, printing, electronics, pharmaceutical, textile printing and dyeing, food, furniture, plastic, feed, leather, machinery, semiconductor manufacturing and material synthesis.
(2) UV Photolysis Purification Solution
UV photolysis waste gas treatment technology adopts high-energy UV ultraviolet beams to decompose oxygen molecules in the air and generate free active oxygen. Due to unbalanced positive and negative electrons, free oxygen combines with oxygen molecules to produce ozone. With strong oxidizing property, ozone synergistically decomposes and oxidizes organic waste gas and odor gas, degrading pollutants into low-molecular compounds, water and carbon dioxide.
1. Technical Characteristics
(1) Efficient deodorization: It can effectively remove VOCs, inorganic substances, hydrogen sulfide, ammonia, mercaptans and other odorous pollutants. The deodorization efficiency exceeds 95%, complying with Emission Standards for Odor Pollutants (GB14554-93) and Integrated Emission Standard of Air Pollutants (GB16297-1996).
No pretreatment is required. The equipment can operate normally under the ambient temperature of -30℃ to 95℃, humidity of 30% to 98%, and PH value of 2 to 11 without heating or humidifying treatment.
(2) No additional chemicals required: Only exhaust pipelines and exhaust power are needed for waste gas conveying. No extra substances participate in chemical reactions during purification.
(3) Strong adaptability: Suitable for purification of medium and low-concentration industrial waste gas. Continuous 24-hour stable operation is available.
(4) Low operating cost: No mechanical movement and noise. Regular inspection is required without manual supervision. The equipment features low energy consumption and low wind resistance (less than 50pa), saving exhaust power consumption.
(5) High safety and reliability: Adopting photolysis principle with explosion-proof modules. The equipment has excellent fireproof, explosion-proof and anti-corrosion performance. It is especially suitable for industries with high explosion-proof requirements such as oilfields, petrochemical industry and pharmaceutical industry.
2. Application Scope
It is applicable to the purification of odorous gas and industrial waste gas in printing factories, printing and dyeing mills, electronic factories, plastic factories, coating factories, furniture factories, oil refineries, rubber factories, chemical plants, paper mills, leather factories, pesticide factories, pharmaceutical factories, paint factories, chemical fertilizer plants, food processing plants, feed factories, spice factories, slaughterhouses, sewage treatment plants, garbage transfer stations and spraying workshops.
(3) Catalytic Combustion Solution
Regenerative Thermal Oxidation (RTO) technology heats organic waste gas above 760℃ to oxidize and decompose VOCs into carbon dioxide and water. The high-temperature flue gas generated by oxidation flows through special ceramic regenerators for heat storage. The stored heat is used to preheat the subsequent organic waste gas, reducing fuel consumption for gas heating.
1. Technical Characteristics
(1) Self-heating combustion is realized for high-concentration waste gas with low operating cost and high cost performance.
(2) High purification efficiency; the purification rate of three-chamber RTO can reach 99.5%.
(3) Ceramic regenerators are adopted for heat recovery with alternating preheating and heat storage processes. The thermal efficiency is not less than 95%.
(4) The furnace adopts reliable steel structure and thick thermal insulation layer for safe and stable operation.
(5) PLC programmable automatic control system with high automation degree.
(6) Wide applicability for all kinds of organic waste gas.
(7) Waste heat recycling brings high economic benefits. Excess heat can be reused for drying rooms and ovens to save extra fuel and electric energy consumption.
2. Application Scope
It is suitable for the treatment of medium and high-concentration high-air-volume organic waste gas in industries such as petroleum, chemical industry, plastic, rubber, pharmaceutical, printing, furniture, textile printing and dyeing, coating, semiconductor manufacturing and synthetic materials. The treatable organic substances include benzene series, phenols, aldehydes, ketones, esters, alcohols and hydrocarbons
