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Problems in the actual production and use
of water curtain vortex spray paint room
Although the water curtain scroll spray
paint room in the paint mist treatment relatively improved a lot, but due to
the domestic coating equipment manufacturers, the size of many different
equipment manufacturers, excessive pursuit of profits, not much investment in
research and development and their own technical standards and the use of
business blindly reduce the investment cost of equipment resulting in spray
paint room technology content is not high, the key technology in the design and
use of the process is not well controlled, resulting in the actual production
of spray paint room still There are still some problems in the actual
production of the spray booth.
1 Circulating water level is not easy to manage
Water curtain scroll spray booth is through the sawtooth plate near the
high-speed airflow (speed up to 25 m / s) will be water atomization to improve
the efficiency of paint mist capture and purification of air. For a paint
booth, the atomization effect depends largely on the level of the circulating
water in the booth, and the change of the liquid level directly affects the
airflow speed and water atomization effect at the serrated plate and scroll
plate. At present, the water curtain scroll spray paint room liquid level is
controlled by overflow tank and water float, overflow tank and water float
installed in the back of the spray paint room slagging tank, inconvenient for
the operator to monitor from time to time, water float often occurs due to poor
maintenance and paint slag sticking, clogging or falling off, automatic water
replenishment function fails, resulting in circulating water level is not
normal, spray paint room purification performance becomes poor, so the design
of reliable automatic water replenishment and Effective water level management
is a necessary condition to ensure the efficiency of paint mist capture.
2 Paint residue can not be discharged to the slag tank normally
The normal work of the water curtain scroll spray booth, spraying work
area on the water surface of the paint slag and scroll separated from the paint
particles should be able to be driven by the airflow, following the water flow
over the scroll plate, the diversion plate into the paint booth behind the
paint slag treatment tank; treatment tank design in the back of the paint
booth, so that the paint booth in the normal work, but also in the continuous
production process of paint slag collection and processing, extending the
circulating water life, to ensure the quality of circulating water, and to
reduce the discharge of waste water. In actual production, often due to the
unreasonable design of the scroll plate, resulting in paint slag can not
smoothly cross the scroll plate, paint slag kept accumulating at the scroll
plate, condensation into a block, resulting in poor air exhaust from the spray
paint room, water level disturbance, spray paint room purification effect
becomes worse, and even cause production downtime.
3 paint spraying room air volume, high energy consumption, high
operating costs
Paint spraying room in the painting operation, need a lot of supply and
exhaust air to capture and take away the spraying work area of the paint mist
and control the spread of harmful substances. Domestic equipment manufacturers
to make the spray booth paint mist treatment effect is not good, rely on
improving the air supply and exhaust volume of the spray booth to ensure the
cleanliness of the painting area environment and product coating quality, is 3
to 4 times the amount of foreign advanced water curtain scroll spray booth
ventilation; domestic 1 operating surface width of 3 000 mm spray booth air
supply and exhaust volume is generally 18 000 ~ 20 000 m3 / h (foreign only 7
500 ~ 9 000 m3 / h) In order to make such a low concentration (VOC), large air
volume of gas to meet the standard emissions, it is necessary to set up a huge
activated carbon adsorption secondary purification equipment, its equipment
costs, power consumption, floor space and other investments equivalent to
several times the spray paint room; large exhaust volume means the need to
configure high-power fans, the corresponding energy consumption becomes large;
in order to high-quality painting production and In order to meet the
operator's comfort, the temperature and humidity in the spraying room are
required to be within a certain range, which requires heating and
humidification in winter and cooling and dehumidification in summer, resulting
in high energy consumption and loss in the operation of the spraying room; for
the northern region, especially in places with extreme temperature and
humidity, the heat and cold loss is more serious, resulting in high operating costs
of the spraying room.
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