Analysis of the Problem for Asphalt Mixing Equipment Dust Removal System
This article analyzes the problems that are prone to the dust removal system component of the asphalt mixing equipment, and explore the solution of the problem to quickly deal with the problem of the dust removal system and reduce the construction progress caused by the dust removal system. Pollution to the environment. Due to the poor effect of gravity dust removal, inertial dust removal, gravity or inertia dust removal and water dust removal, the effect of the emission indicators required by national standards cannot be met. The configuration method of the dust removal system of the second -level cloth bag is analyzed.Common failure of dust removal system.
There are two common failures of dust removal systems: insufficient wind and dust removal effect. Insufficient dust removal systems are mostly manifested by the burning end of the dry roller, turning the smoke, poor combustion effects, and the temperature of the material. The dust removal system’s dust removal effect is almost manifested as chimney smoke.
Fault cause analysis
Based on the analysis of the working principle and structural characteristics of the dust removal system, the causes of insufficient winds are: the pipeline, dust collector or cold air valve leaks in front of the dust removal system; obstruct the aircover pipeline; the dust collector obstructs; The poor dust removal effect is mainly caused by the dust collector. Specific analysis should be performed for the cause of the fault.
Analysis of the cause of leakage
When the dry roller’s feed inlet, the inductive pipeline connects the flange, the dust collector connects the flange or the cold wind valve on the flange or the wind pipeline, if the seal is not strict, it will cause the short circuit of the wind machine. After the burner burned, the exhaust gas was drawn away, the dry drum was positively pressed, and smoking outward. If this is the problem that causes insufficient winds, you can intuitively judge from the current of the air -cited machine. In this case, the current of the fans will be higher than the current of normal production.
Analysis of the cause of wind pipeline obstruction
The obstruction of the wind pipeline can cause the entire dust removal system to exceed the pressure of the fans, which causes the induced fan to be unable to use the dry roller and mixing and the building to extract the burning tail gas and the pressure of the air. If the asphalt mixed material mixing equipment runs in the small and medium -sized load state for a long time and the campaign has been in a small air volume during the operation process. Due to the low wind speed in the wind pipeline, the level of dust retention will occur in the horizontal section of the wind pipeline, and the pipeline will eventually block the pipeline. Essence If the design of the wind pipeline is unreasonable, even under normal state, it will cause local pipeline obstruction.
The inferior fan of the asphalt mixing equipment generally has a wind door adjustment mechanism. If there is a problem with the wind door adjustment mechanism, it will also lead to poor wind.
Analysis of the cause of dust collector blocking
The blocking of the dust collector can cause the entire dust removal system to exceed the pressure of the reference manner, causing the inductive fan to be unable to use the dry drum mixing and the building to extract the burning tail gas and the pressure of the air, so there is a lack of wind. This phenomenon is more common at the operation site of asphalt mixing equipment. The dust collector block is divided into a first -stage gravity or inertia dust collector obstruction and the cloth bag dust collector obstruction.
The first -class gravity or inertia dust collector extracts the large particles of dust from the dry roller, and is filtered out and sent it to the thermal set to be used as a fine collection. If the dust filtered out of the first -level gravity or inertia dust collector cannot be taken away in time, it will stay and accumulate in the dust collector, and eventually block the entire dust removal channel.
The obstruction of the cloth bag dust collector is actually blocking the filter bag in the bag dust collector. The material of the filter bag is poor, the filter bag’s viscosity decreases, and the ash of the filter bag is not thoroughly obstructed.
(1) Problem of the dust collector bag. The filter bag used for asphalt mixture mixing equipment is generally recommended to use waterproof rejection oil acupuncture material, such as Nomelks needle felt. In addition to good temperature resistance, this kind of acupuncture felt has the advantages of water and refusal. If the filter bag with a poor material on the cloth dust collector, under the action of high -temperature tail gas, the material of the filter bag will produce deformation and degeneration, and the breathability decreases, resulting in the increase in the work resistance of the bag dust collector and the poor wind.
(2) Insufficient burning problem. The fuel oil viscosity used in asphalt mixing equipment is large, the effect of the burrier atomization, or the lack of burn offsets will cause insufficient combustion. Once the combustion occurs, the tail gas will contain a large amount of non -burning oil mist. These oil mist gathered on the filter bag of the bag dust collector, and mixed with the dust to form a mud covered with the surface of the filter bag, on the filter bag on the filter bag A barrier is formed to reduce the breathability of the filter bag, which causes the work resistance of the cloth bag dust collector to increase, and the wind is not smooth.
(3) Anti -blowing ash problem. There are three types of layout of the cloth bag dust collector with asphalt mixing equipment: one is high -voltage pulse anti -blowing, the other is the anti -blowing blower, and the third is the atmosphere anti -blowing. Regardless of the way to clear the gray, the bag dust collector is removed in time to remove the dust adhesive on the outside of the filter bag under the resistance of a certain working resistance; The dust dropped after being re -adsorbed by the filter bag, that is, the so -called secondary dust will cause poor ash clearing effects. A large amount of dust can be absorbed to the outside of the filter bag to clear it, which reduces the breathability of the filter bag, causing the working resistance of the bag dust collector to increase the work resistance, and the wind is not smooth.
(4) Mechanical failure. The air box -type pulse anti -blowing bag dust collector is one of the high -voltage pulse anti -blowing bag dust collectors. The work characteristics of this dust collector are offline anti -blowing, that is, to block the winding of the anti -blowing studio, and then to this to this The studio opened high -pressure anti -blowing air. Because mechanical failures will cause some studios to not be opened after blowing, and the wind has been blocked; in this case, the filter bag area participating in the work is far less than the total working area. The work resistance of the device increases, and the wind is not smooth.
Analysis of the cause of air volume and insufficient wind pressure
The induction air volume configured by the dust removal system is based on the comprehensive consideration of the three factors such as the exhaust amount of the tail gas, the amount of water vapor and the normal coefficient of the burning system produced by the full -load of the equipment. If this data is calculated error or the configuration of the air volume of the air volume does not reach the calculation air volume, it will lead to insufficient wind. In addition, wind pressure is another main parameter of the ventilator. Wind pressure is a manifestation of reflecting the resistance capacity of the induced fan to overcome the resistance capacity of the dust removal system.Or block in the dust removal pipe or cloth bag dust collector.
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