Compressed air is widely used as an energy source in the automotive industry because the automotive industry requires a large amount of compressed air for painting, welding, body and final assembly. The compressed air system has its technical specificity and is affected by various factors. The impact (equipment factors, technical factors and management factors, etc.), the utilization efficiency of compressed air is very different, so the potential for energy saving and emission reduction of air compressor systems is huge. Second, the new technology of condensate discharge air pressure system each drainage point is the weakest point in the system chain, the previous use of solenoid valve drainage, one is due to its poor reliability, often blocked, causing hidden dangers, once the shop stops production, the consequences Unbearable. For some enterprises, one hour of downtime will result in losses of tens of millions of yuan. Second, due to the principle of the solenoid valve itself, it causes energy loss when working exhaust. After calculation, the amount of gas under the filter can reach 8,000 yuan / a in terms of the loss of electricity costs, and the gas loss at the point of the entire system drainer reaches nearly 400,000 yuan a year. In order to solve this problem, the company adopted the German Becker liquid level automatic drainer, which works as shown in the figure. First, the liquid level control only drains and does not exhaust and has high reliability; the second is energy saving, which indirectly improves the efficiency of the air compressor. Condensate enters the process 1. Container 2. Condensate inlet 3. Upper pilot pipe 4. Conductive magnetic valve 5. Diaphragm valve condensate discharge process 6. Capacitance level sensor 7. Seat 8. Condensate outlet condensate flows from the inlet Go to the container and gather here. At this time, the compressed air acts on the diaphragm valve through the upper pilot pipe and the first conductive magnetic valve. Since the contact area between the upper portion of the diaphragm valve and the compressed air is larger than the lower portion, the upper pressure is larger, the diaphragm valve is closed, and the diaphragm valve is ensured. Absolutely sealed between the seats. As the condensate in the container gradually increases, when the liquid level rises to the highest point, the capacitance liquid level sensor sends a signal, first the conductive magnetic valve acts, the upper first conduit is closed, the pressure above the diaphragm valve is relieved, and the diaphragm valve is condensed from the condensate Below the top of the valve seat, the pressure inside the container will be condensed by the export force platoon researcher-level senior engineer Hu Hanqiao energy-saving topic No. 8 general machinery EnergySavingSpecial. At this time, the electronic system of the BEKOMAT condensate drainer calculates the rate at which the liquid level drops to the lowest detection point, and based on this rate, accurately determines the opening time of the diaphragm valve, and closes the valve in time before the compressed air leaks. Once the condensate is not discharged properly (eg, drain pipe blockage, diaphragm valve failure, etc.), the system will switch to the alarm mode after 60s. At this time, the red indicator light flashes and the alarm signal can be transmitted to the control room when needed. In the alarm mode, the first conductive magnetic valve will open for 7.5s every 4 minutes. This will ensure that the BEKOMAT will be periodically pressurized, and automatically resume normal operation after the blockage is opened, and the alarm will be cancelled. In the production of compressed air, condensate is inevitably produced, and often accompanied by oil, foreign particles (such as rust) and other harmful substances, the condensate produced by the "oil-free" compressor also has some corrosion. Sex. It is therefore necessary to remove and treat the condensate to ensure high quality compressed air. By installing the liquid level automatic drainer, only the energy saving of the drainer saves the electricity cost of the air compressor by 21.3%, which greatly improves the use efficiency of the air compressor, prolongs the service life of the air compressor and improves the production efficiency. Third, the application of frequency conversion technology in air compressor systems. In actual production, the amount of gas required is constantly changing, and the rotor speed of the screw air compressor is constant, resulting in a large amount of energy loss and equipment damage for the following reasons. 1) The displacement of the air compressor is tolerant, so no matter how to reduce the load, the compressor motor is always in the rated working state, resulting in waste of energy. 2) In order to meet the gas requirements of production equipment, the air compressor adopts pressure control. That is, when the maximum pressure set by the system is reached, the air compressor is unloaded, and the compressor is in a light load working state (the power consumption is 30% to 60% of the rated power); at this time, the air compressor is still in a state of wasted power. 3) When the air compressor is working at light load, if the gas pressure of the air tank does not change within the specified time, the compressor will stop working. It will bring the compressor to start frequently. Although the Y-â–³ step-down start is adopted, the starting current is still 3 to 5 times of the rated current. It has a large impact on the power grid and other electrical equipment, and it is easy to burn the motor and start the electromagnetic switch. (MCC), at the same time, the service life of the air compressor is greatly reduced. For example, the low-voltage system of a 250kW air compressor motor burned after more than two years of operation. Fourth, the conclusion. Before the transformation, the daily power consumption of the low-voltage system was 25,955 kWh, and the conversion was 23,540 kW. h, the average daily reduction of 2515kW? h; reduce electricity by 10%; annual electricity savings of nearly 600,000 yuan. Through these transformations, the energy-saving results are remarkable and the purpose of energy conservation is achieved. 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I. Overview