Too small selection results in insufficient compressor displacement Many users just start not knowing the specific gas consumption of their own production, so they blindly select the model according to their own estimates, resulting in exhaust pressure not coming up, below the rated exhaust pressure, which cannot meet the normal gas consumption of the factory. You can first check whether there is a leak point in the pipeline, close the valve behind the gas storage tank, if the unit can quickly raise the pressure, open the valve, the pressure drops quickly, and finally at a pressure point, you can confirm The compressor unit selection is too small, and the unit exhaust volume is less than the actual gas consumption for production. The solution is to add a new unit, so that the compressor's exhaust volume is greater than the gas consumption by 10-20% is the most scientific.
1. Selection of working pressure (discharge pressure) When the user prepares to purchase an air compressor, first determine the working pressure required at the gas end, add a margin of 1-2 bar, and then select the pressure of the air compressor (the margin is considered to be installed from the air compressor (The pressure loss of the distance from the location to the actual gas-end pipeline should be appropriately considered according to the distance between 1-2 bar). Of course, the size of the pipeline diameter and the number of turning points are also factors that affect the pressure loss. The larger the pipeline diameter and the fewer turning points, the smaller the pressure loss; otherwise, the greater the pressure loss. Therefore, when the distance between the air compressor and the gas end pipelines is too far, the diameter of the main pipeline should be appropriately enlarged. If the environmental conditions meet the installation requirements of the air compressor and the working conditions allow, it can be installed near the gas end. 2. Selection of volume flow ① When selecting the volumetric flow rate of the air compressor, you should first understand the volumetric flow rate of all gas-consuming equipment, and multiply the total flow rate by 1.2 (that is, enlarge the 20% margin); ② The new project can be selected according to the flow value provided by the design institute; ③ Consult the gas consumption equipment supplier to understand the volume flow parameters of the gas consumption equipment for selection; ④ For air compressor station reconstruction, you can select the model based on the original parameter value and actual gas consumption. Appropriate selection is beneficial to users and air compressor equipment. Too large and wasteful selection, and too small selection may cause the air compressor to be in the loading state for a long time, or the gas is not enough or the pressure is not up to the disadvantages. 3. The relationship between power, working pressure and volume flow In the case of constant power, when the speed changes, the volume flow and working pressure also change accordingly. For example: a 22kW air compressor, the working pressure is determined to be 7bar at the time of manufacture, the speed is calculated according to the technical curve of the compressor host, and the displacement is 3.8m³/min; when the working pressure is determined to be 8bar, the speed must be reduced (otherwise The drive motor will be overloaded). At this time, the displacement is 3.6m³/min. Because, the speed is reduced, the exhaust is reduced accordingly, and so on. The selection of power is that the power supply capacity can meet the power of the matched drive motor under the conditions of working pressure and volume flow. Therefore, the steps to select an air compressor are: first determine the working pressure, then determine the corresponding volume flow, and finally the power supply capacity.
