Product
Pneumatic dedusting system
1. System
Introduction
The pneumatic dedusting system is a
current conveying method widely used in powdery materials conveying system on
power industry, chemical industry, building materials industry, steel industry,
food industry, etc. It enjoys the advantages of simple equipment, flexible duct
configuration, safe and helpful to environmental protection, and high energy
saving efficiency, etc. While in the past use of the device, most plants mainly
adopt dilute phase suspending flow conveying method. Such method has striking
limitation as high energy consumption, low conveying efficiency and serious
wear etc. Therefore, it is quite necessary to develop dense phase pneumatic
conveying device of low speed, high efficiency and reliable stability. We hence
researched and developed the energy-saving pneumatic conveying system, which
made a breakthrough in the limitation on conveying distance, density,
efficiency, wear and energy consumption for the similar domestic positive pressure
pneumatic dedusting system in other forms. The system can be widely applied to
power industry, chemical industry, building materials industry, steel industry
and food industry etc. for powdery materials conveying.
2. Technical Characters of turbulence double-pipe pneumatic dedusting
system
2.1 High adaptability and reliability:
The unique
working principle of turbulence double-pipe pneumatic conveying system ensures
a rare blockage inside the dedusting system pipe. Even if there`s short time
operation stop, when the system get started again the pipe can be unblocked quickly.
Thus the reliability and safety of dedusting system can be guaranteed. It is
this character that also determines a larger application scope especially for
powdery materials conveying such as lime powder and bauxite etc. which is
difficult to convey. The system has more advantages compared with other dedusting
systems. It is of gentle conveying pressure change, minor air supply volume fluctuation
of air compressor and relatively stable operation, which improves the working
condition of dedusting air compressor and prolongs the equipment life-span. Of
which the performance is better than that of common pneumatic dedusting system
with single pipe.
2.2 Low flow
velocity and wear ratio
The initial
flow velocity of ash and air mixture within the dedusting pipe of turbulence
double-pipe system is 2-6m/s, the terminal velocity is about 15m/s, and the
average velocity is 10m/s. While in dilute phase dedusting system, the corresponding
velocities are 10m/s, 30m/s, and 20m/s. The wearing capacity is in direct
proportion to cube to 4th power of conveying velocity which indicates that the
wearing capacity in turbulence double-pipe dedusting system is 1/8-1/16 of that
in dilute phase dedusting system. That is to say the service life of dedusting
pipe in turbulence double-pipe system is 8-16 times of that in dilute phase dedusting
system.
(Sketch of dome valve) (Sketch of discharge valve)
2.3 Less investment and low energy consumption
Because the ash and air mixture in this turbulence double-pipe dedusting system
is of slow flow velocity and low wear ratio, it's unnecessary to use wear resistant
material and thick wall pipe so that the investment and maintenance costs on dedusting
pipe can be greatly reduced. Meanwhile, the corresponding air consumption is
also reduced because of the high conveying concentration, so does the
filtration area of bag filter on the silo, the investment on equipment, the corresponding
equipment match power and the energy consumption. Years of practical operation
proves that its power consumption is lower than that of dilute phase dedusting
system by 30%-50%.
2.4 Strong conveying power and long conveying distance
Generally, the concentration will reduce
as the increase of the conveying distance, so does the system conveying power.
However, the conveying power in turbulence double-pipe system can reach to
100t/h above and the conveying distance is 1500m above (3000m for special
requirement) which seems difficult to be achieved by using other systems.
2.5 Several
feeding tanks can convey the materials at the same time
It is capable of connecting several
feeding tanks in series to one conveying pipe for simultaneous operation and
realizing centralized control which makes the system simpler, more flexible and
convenient.
3. Composition of the pneumatic conveying
system
The pneumatic conveying system mainly consists of electric precipitation down
conveying system, plant area conveying system, ash silo system, gasification
system and control system.
Main components
The main components of pneumatic conveying system are: ash discharge flashboard valve, expansion joint, pneumatic dome valve, feeding tank, flashboard discharge valve, conveying pipe, air-supplement ring, wear resistant elbow, vehicle bulk loader, double-axles mixer, gasification device, vacuum pressure relief valve, tee shunt valve, ash silo feeder, and dust collector on the silo etc.
