Releasing organic solvent into the atmosphere will bring adverse
effect to both human beings and the global environment. To reduce
or eliminate the gas containing VOC ( volatile organic compound) is
a difficult thing, so people often release it to the atmosphere
directly. VOC solvent concentration recovery wheel handling unit is
such a device: it can concentrate the large-volume
low-concentration volatile organic compound gas into small-volume
high- concentration gas. We combine the concentration recovery
wheel handling unit with the traditional exhaust gas handling
method, so that it can effectively eliminate all kinds of volatile
organic compound produced in industrial production. The core
technology of VOC solvent concentration recovery wheel is from
Nichias: Nichias authorizes Wuxi Lianzhong humidity-controlled and
energy-saved equipment Ltd. to operate its VOC solvent
concentration recovery wheel and dehumidifier wheel and provides
technical support.
There is a lot of exhaust gas containing organic solvent during
paint spraying, directly releasing it into the atmosphere will
cause environmental pollution; On the other hand, the paint
spraying room needs to control the humidity and temperature, so it
must consume a lot of energy to deal with the added fresh air into
the paint spraying room.
For example, in the traditional painting room, if the emission
volume of exhaust gas is 20,000 steres per hour, the added fresh
air into the paint spraying room is about 15,000 steres per hour,
that is to say the fresh air needed to be dealt with is about
15,000 steres per hour. Because of big air volume, the energy
consumption is also big.
The character of this process is that after handling, 80% exhaust
gas of paint spraying room can be sent back to the room as fresh
air. The paint spraying room can achieve the following effects
after adopting VOC solvent handling device of Lianzhong Company:
The organic content of exhaust gas is less than 50ppm;
The energy consumption of handling fresh air is reduced by more
than 70%.
The handling process of organic exhaust gas developed by Lianzhong
company in paint spraying room is as follows:
NMP, which is widely used in lithium-ion battery production
process, has a high boiling point of about 200 ℃, the conventional
recovery system isn’t able to recycle it. If recycling NMP gas by
refrigeration, its concentration in the exhaust gas will be as high
as about 200% and will easily lead to explosion. In the lithium
battery pole coating process, more than 95% organic solvent
N-Methylpyrrolidone volatilizes into the exhaust gas, so this will
cause environmental pollutions and do harm to human beings, on the
other hand, it will cause waste of the organic solvent. The VOC
solvent recovery unit (organic exhaust gas handling equipment)
produced by Lianzhong company has been successfully applied to the
lithium battery production process.
Our company has started to produce NMP solvent recovery equipments
since 2004, and its technology gradually maturates, up to now, our
company has produced nearly 100 sets of NMP solvent recovery units,
the annual recycling of NMP organic solvent is nearly 2,000 tons.
The use of efficient energy-saving technology enables the heat
consumption of coating machine to be reduced by 40%: there is a lot
of gas whose temperature is generally about 120 ℃to be released
during coating process, while a lot of fresh air is added into the
coating machine. Lianzhong company adopts advanced heat transfer
technology to exchange the heat between the exhaust gas and fresh
air added to the coating machine to preheat the fresh air to 70C or
so, so that the heating energy of coating machine is reduced by 40%
or so.
Using refrigeration-adsorption concentration technology to recycle
NMP organic solvent in the exhaust gas enable the recycling rate of
organic solvent more than 95%: As the exhaust gas of the coating
machine has big volume and low concentration, our company adopts
the advanced concentration technology of Nijiasi Co., Ltd. to
concentrate the organic solvent in the exhaust gas to a certain
concentration, then to condense and recycle it, so the recycling
cost is reduced.
The content of NMP organic solvent in the gas dealt with by solvent
recovery unit is less than 50ppm, fully meeting the requirement of
ISO14000.
We adopt closed cycle to the air of the coating machine, so the
effect of environment temperature, humidity and air quality to the
coating quality is reduced.
Printing, shoemaking and rubber process require using the organic
solvent which often adopts volatile organic compound of low boiling
point, such as toluene, xylene, acetone, butanol, e
