Product Overview
The built-up and arching of materials in the bunker has already become an inevitable universal malady of all types of bunkers. It is necessary to equip bunkers with a most advanced and ideal device preventing arching and promoting flowing of materials to improve the flow rate of materials in the bunker and to prevent arching, blocking and sticking of materials in the bunker with the most safe, energy-saving and quick method while maintaining the continuity of the production process. A frequent problem in thermoelectric power station is the blocking of raw coal bunker, which harms the raw coal problem in thermoelectric power station is the blocking of raw coal bunker, which harms the raw coal bunker greatly and may leads to output drop of the coal mill or even spontaneous combustion and explosion.
Introduction to air cannon
Air cannon, also known as air arch-breaking flow-aiding machine or dredger, eliminates the blocking by a sudden expansion shock wave, generated from the sprayed strong compressed gas with a speed of over I mach (sound velocity), directly blowing the blocked materials. It can resume material flow at one operation without causing the static friction of materials. As the compressed air is spraried like vortex, it is also called vortex blaster. It's a new patent of our company. Applying the aerodynamics, the equipment can convert compressed air into jet kinetic force with strong impct force uding a differential pressure device and automatic-controlled quick exhaust valve in it; so it is a kind of ideal clean and pollutiong-free block-cleaning soot -blowing equipment with low energy consumption.The euqipment possesses advantages of simple structure strong impact force, safe, energy saving, easy operation with automatic control, and damage free for bunkers.
Features:
● Fast ejecting effectively breaking material bridge and eliminating blocking;
● The combined air cannon with strong applied force;
● Operating almost silently with low noise and no polltion;
● The no-leakage design may effectively utilize the energy;
● Materials in the bunker may not be compressed;
● Required minimal maintenance: remove parts simply, since there are no motors and bearings, there is no need to apply lubrication;
● The strong ejecting force may be applied for wide range effectively;
● The special reset device allows automatic resetting quickly after ejecting to block the materials in the bunker enters the body by mistake;
● The service life is long, and free maintenance is provided for all parts and components within one year.Major Reasons and Forms for Bunker Blocking
Currently, the raw coal bunker of domestic thermal power plant often applies the cement, steel and concrete structures, which mostly are cylindrical, square tapered (at the bottom) shape, conical and hyperbolic. The large mouth at top is the inlet, and the small mouth at bottom is the outlet. Materials drop from the top to the bottom by gravity. Since the dropping materials flows in the tapered container, the sectional areas become increasingly smaller as going down. Then the materials will be pressed, and the friction increases. Therefore, it is the main reason for blocking. Otherwise, there are other reasons concerning with the materials’ water content, the fineness degree, change of temperature, time for materials being stocked in the bunker, the increasing friction coefficient between the wall and the materials. Currently, the blocked materials mainly shape in arch, parabola and some shape like fireplace. The blocked part mostly lies in the place top of the material gate within 1.5m and 3.5(but not limited in the range). In this range, a thin layer of materials may be adhered on those areas within that range, then the friction increases, and it may expands axially and radially. The thickness grows correspondingly. Consequently, blockings of different shapes form.
Bridge Funnel Arching Fireplace
Model Selection (Only for Reference)
Instruction
1. Since different materials with different characteristics, the crusting and blocking situation varies. Therefore, there are great differences on the quantity on the quantity of air cannon applied. Generally, the finer the power, the more difficult when they are cleared, and the blocked massive materials are hard to be eliminated either due to material biting.Control for operation of air cannon
The operation of air cannon is very flexible. There are several control modes for your selection, including single control with manual an pneumatic mode, single control with electric mode and shoot in group, and timing automatic shoot. The operation procedure goes as follows: Open air inlet valve first, then the air cannon will flow over into cannon automatically, press “start” to send a pulse electric signal or air signal to quick exhaust valve to start shooting, and then air cannon will release strong airflow through exhaust outlet, then it will come back to original state ready for the next operation cycle in any time. Manual operation of air cannon is conducted by operating buttons or using knob in reversal valve, and automatic control system is executed by air cannon automatic controller. We can also adopt programmable controller to control the entire process system. Operator can set operating order of air cannon system or make separate operation to designated single air cannon via buttons on the control panel. We are aim to provide with a safe and automatic system which can realize unmanned control of air cannons.Automatic Control System
We have intelligent control box dedicated for air cannon developed by our company which is superior to universal PLC in performance. Dedicated equipment, which can be easily programmed and not need profession skill, have a sound communication function and reasonable I/O setting, which can meet your various needs such as linking up network, multi-computer management, sounding alarm and so on.There are 3 working modes:
1. Programme-control automatic mode: in this mode, time sequence control and conditioned reflex control can be achieved. Also the function of setting start an stop of equipment can be achieved, and then operator can set the start and stop time of equipment according to actual situation so as to obtain the best result.