Exhaust gas purification for Spray paint

Spray paint exhaust characteristics:

(1) Usually accompanied by a large number of over spray paint fog particles;

(2) There are many types of paints, different solvents used, and complicated organic compounds (including organic solvents in paint including benzene, ethers, lipids, ketones, alcohols, alcohol ethers and hydrocarbons etc. Some low-molecular auxiliaries may return to the atmosphere, some benzene, alcohol and lipid belong to double high yield and three substances);

(3) Mandatory paint spraying process, exhaust operations, discharge air volume, high concentration of organic matter. Currently involved in some key industries spray paint technology, such as motor vehicle manufacturing and maintenance, furniture, home appliances, machinery and equipment manufacturing, pipe industry, shipbuilding, containers and so on. In the heavily polluting industries where the VOCs emissions are heavy, such as furniture manufacturing, containers, shipbuilding, automobiles, home appliances, etc. occupy a high share in the world. Therefore, in the future countries in the fixed-source VOCs emission reduction, spray paint exhaust control is the top priority.

According to the spray paint composition of the exhaust gas plant and the concentration of the size and characteristics of the scene conditions, I recommend the integration of purification equipment, adsorption and concentration on the paint exhaust gas filtration treatment

Adsorption concentration - catalytic purification equipment characteristics and safety measures.

Firstly, the equipment features:

(1) PLC automatic control, ad hoc computer touch screen real-time monitoring, recording, the system is equipped with automatic monitoring record reading system, with the computer and cable can get equipment running data, including time, desorption temperature, burning Temperature and so on.

(2) A full set of equipment compact structure, reasonable layout, elegant appearance.

(3) Pay attention to the safe use of performance, in the design to take multiple safety facilities to prevent accidents; heater with far-infrared fin electric heating tube, safe and efficient.

(4) The desorption-catalytic combustion system has a compact structure. The hot-air dual-cycle heat storage system uses high thermal efficiency and low energy loss, and achieves the heat balance between desorption endotherm and combustion exotherm. That is, the combustion process does not consume additional electric energy, Very low consumption.

(5) Adopt new adsorptive activated carbon, good kinetic performance, fast adsorption and desorption rate, complete desorption and desorption, slow absorption rate of regeneration, long service life.

(6) High catalytic combustion efficiency, clean thoroughly. As a result of the new honeycomb shaped precious metal catalyst, the light-off temperature is low, the combustion is complete and the safety is flameless combustion, and the product is non-toxic and harmless.

(7) Adsorbent bed air flow distribution, install charcoal, overhaul, easy to replace, equipped with airflow distributor, so that the cross-sectional area of the gas evenly through the gas, not short or penetrate the charcoal layer, so that the adsorption effect is better.

Secondly, safety measures:

As the purification system is dealing with flammable and explosive gases, the design to take the following safety measures to ensure the safe operation of the system:

(1) Set efficient filter flame arrester, making the device can play the role of fire retardant, double effect.

(2) The desorption-catalytic combustion system is relatively independent of the adsorption system (single bed can only be in the adsorbed state or desorbed state only during the whole system operation), and the desorption-catalytic combustion system completely avoids the adsorption system and the tube The impact of the road, thus putting an end to "intrusion" phenomenon.

(3) The combustion method for catalytic combustion, is a low temperature flameless combustion, absolutely no open flame.

(4) Strictly control the concentration of "VOC" of exhaust gas in the system below 1/4 of the explosion limit (about 10g / m3). When the exhaust gas concentration is too high, an alarm sounds and the fresh air valve is opened, immediately lowering the concentration and avoiding potential safety hazard.

(5) Catalytic devices, adsorption devices are equipped with explosion-proof membrane.

(6) Purification system with bypass valve, to ensure ventilation workshop to facilitate emergency maintenance; the system has started to debug and emergency manual system to ensure the normal production.

(7) Set multi-point temperature control equipment, at the same time with automatic alarm system.

(8) The equipment is equipped with safety fire damper. When the temperature of the equipment is too high during the working process, all the other air shutoff valves except the straight valve are closed to cut off the access to the equipment and the workshop. The fan is stopped and filled with inert gas immediately to prevent accidents.

(9) Under the condition of high temperature in summer, ventilation and cooling are filled with inert gas at the same time to avoid the conditions of natural oxidation of activated carbon.

(10) The use of fresh hot air evenly into the adsorption box activated carbon desorption and regeneration;

(11) The whole system equipment and duct are well grounded to eliminate static electricity, and according to the relevant requirements of the installation of lightning protection system.

(12) Preheater tube far infrared heating tube.

(13) Catalytic and adsorption devices are temperature alarm system, and with bypass fresh air duct to "fly temperature" when the introduction of air.

(14) Using thermal insulation performance, light weight refractory fiber insulation materials.