green and environmentally friendly concrete mixing plant (station) is aimed at energy saving, consumption reduction, emission reduction and environmental protection. It relies on technology and management methods in the production, transportation (including raw materials) and use of commercial concrete A production method that minimizes pollution emissions and maximizes efficient use of resources.
From the perspective of energy saving and consumption reduction, the main energy-consuming equipment of the concrete mixing plant is concrete mixer , aggregate conveying belt conveyor and powder batching screw machine. Taking the traditional HZ180-1$3000 commercial concrete mixing station as an example, the main machine is a 3m forced twin-shaft mixer, the driving main motor power is 2×55kW, the total power of the two aggregate conveyor belts is generally about 60kW, 6 The total power of the powder batching screw machine is approximately 110kW.
aggregate conveyor belt conveyor is not easy to optimize because it is restricted by the lifting height and conveying volume. Therefore, the key to energy saving is to reduce the energy consumption of the mixer host and the powder batching screw machine. Through experiments and analysis, the maximum output power of the concrete mixer motor is generated within a short period of time after the aggregate is put into the mixer. Without affecting the quality and output of concrete, the aggregate feeding method is changed to enter the mixer smoothly and evenly, which can effectively reduce this impact current. By optimizing the feeding method and feeding time, the output power of the mixer can be greatly reduced.
It is imperative to comprehensively promote green and environmentally friendly concrete mixing stations.
In the green and environmentally friendly HZ180-1$3000 commercial concrete mixing station, the main driving motor power of the 3m3 forced twin-shaft mixer is 1×75kW. Due to the "slurry coating method" production, the aggregate enters the mixer smoothly. When the power of the mixer's main motor is reduced by 30%, the mixer does not appear to be "stuffy" and the quality of the concrete produced is excellent. Mixing Station The production capacity is guaranteed and energy consumption is actually reduced. The power of the powder screw conveyor is mainly determined by the conveying distance and conveying angle. Through optimized layout, the power of the six powder screw conveyors was reduced by 38.5kW. The above two measures reduced the installed power of the system by about 20%.
From the perspective of emission reduction, the dust pollution in the concrete mixing building (station) is mainly composed of dust during the material transportation process, powder silo feeding and mixing process. A patch sensor is used on the powder silo column to accurately display the inventory by measuring the elastic deformation of the powder silo support structure, effectively preventing powder feeding from exploding the silo and avoiding dust.
At the same time, by optimizing the layout and process, we try to reduce the number of material transfers, seal off parts or parts that are prone to dust, and configure pulse dust removal equipment to effectively collect dust; for dust during the mixing process, active dust removal is used Combined with passive dust removal, the mixer always maintains negative pressure and avoids the generation of dust. The dust collected by the dust removal system is collected centrally and returned to the fly ash silo through the air conveying system for recycling, thus avoiding the waste of cementitious material .
In summary, green and environmentally friendly concrete mixing plants (stations) have technical advantages that cannot be replaced by traditional mixing plants (stations). Today, when the voice of environmental protection is getting louder and louder, green and environmentally friendly concrete mixing plants (stations) should be fully promoted. It is imperative.
