Energy-saving solutions for LED lighting in steel plants, ports, and construction sites

　　1. Lighting safety requirements for construction sites, wharfs, ports and steel plants

　　1.1 The lighting power supply voltage of the wharf, port and steel plant on the construction site shall meet the following requirements:

　　a) In general places, the lighting voltage should be 220V/380V. ...

　　b) For tunnels, civil air defense projects, high temperature, conductive dust and narrow places, the lighting voltage should not be greater than 36V.

　　c) The lighting voltage should not be greater than 24V in wet and easily accessible lighting circuit places. ...

　　d) The lighting voltage should not be greater than 12V on the ground, boiler or metal container with particularly wet and good conductivity.

　　e) The running light voltage should not be greater than 36V.

　　1.2 Construction site The lighting lines of wharfs, ports and steel plants must use soft rubber sheathed lines and be protected by leakage protecrs. The metal shell of the luminaire should be grounded (zero) for protection.

　　1.3 The phase wire of the lighting lamp should be controlled by the switch, and the phase wire must not be directly introduced.

　　1.4 The "one machine, one gate" system must be implemented, and it is strictly forbidden  directly control two or more electrical equipment (including sockets) {site dock} with one switch.

　　1.5 Overhead lines must use insulated copper wires or insulated aluminum wires.

　　1.6 The metal bracket of the mobile iodine tungsten lamp should be reliably grounded (zero), and the height of the lamp from the ground should not be less than 2.5m.

　　1.7 The mounting bracket of the high-voltage dysprosium lamp should be sturdy and reliable, and rain-proof measures should be taken.

　　1.8 Construction site The distance between the outdoor lighting fixtures of docks, ports and steel plants shall not be less than 3m from the ground, and the distance of indoor lighting fixtures shall not be less than 2.5m from the ground.

　　1.9 220V iodine tungsten lamps used for lighting in construction sites, ports, and steel plants should be fixed and installed, and their height should not be less than 3m, and the distance should not be less than 500mm from combustibles. They should not be directly exposed  combustibles, and 220V iodine tungsten lamps should not be moved. illumination.

　　1.10 Construction site The form and protection level of electric lighting equipment used in wharves, ports and steel plants should be compatible with environmental conditions.

　　1.11 Places that need  be constructed at night or in dark places must be equipped with emergency lighting power supplies.

　　1.12 At night, the construction sites, facilities, and equipment that may affect the safe passage of pedestrians, vehicles, aircraft, etc., must be equipped with red warning lighting.

　　2. Overview of on-site energy consumption at construction sites, wharfs, ports and steel plants

　　At present, the lighting of construction sites, ports, and steel plants is mainly divided in environmental lighting and local operation lighting at the construction site. The lamps are mostly dysprosium lamps, high-pressure sodium lamps, metal halide lamps, iodine tungsten lamps, and ordinary incandescent lamps and energy-saving lamps.

　　The power of dysprosium lamp, high pressure sodium lamp or metal halide lamp is mostly 1000W～4000W. When there is construction at night, it is understandable  turn on  ensure sufficient illumination. When there is no construction work at night, the purpose of turning on the light is only for safety. Once it is turned on , Usually work all night. But this kind of light source does not have the characteristics of dimming, it will be very wasteful.

　　The power of iodine tungsten lamps is generally 500W～1000W. Because the area of ??local operation is mostly below 10 square meters, because this kind of lamps is a diffuse lamp, the surface temperature of the lamp is high and the safety hazard is large. In addition, the light efficiency is low and the irradiation area is large, causing very serious waste.

　　3. Energy-saving countermeasures

　　Through the comparison of the on-site lighting effects of multiple light sources, we have adopted an LED wer crane searchlight instead of a high-power dysprosium lamp  work on the premise of ensuring the lighting safety in the lighting management of the construction site, the port, and the steel plant, which is flexible in control and energy-saving. obvious.

　　LED light source has the following advantages:

　　a) Green and environmentally friendly: the monochromaticity is good, the LED spectrum is concentrated, there is no extra infrared, ultraviolet and other spectrum, the heat and radiation are small, and the impact on the illuminated object is small. And it does not contain mercury harmful substances, the waste can be recycled, and there is no pollution.

　　b) Strong directivity: plane light emitting, strong directivity. It is different from the point light source incandescent lamp, the viewing angle is ≤120°.

　　c) Fast response: The response time is short, only 60ns, and the start-up is very fast; incandescent lamps or metal halide lamps are on the order of milliseconds; high-pressure sodium lamps or metal halide lamps often take 1  2 minutes  fully start.

　　d) Low voltage: The driving voltage is low, and the working voltage is DC, which is safe.

　　e) Small size: small size and light weight. With its characteristics, various styles of lamps and lanterns that are thin, light, and compact can be designed; backlight products.

　　f) Multi-color: The LED colors are bright and rich. Different semiconducr materials, different colors of light. The color saturation reaches 130% full color. The combination of different light colors can vary widely, and the use of timing control circuit can achieve a richer and more colorful dynamic change effect.

　　g) Convenient control: as long as you adjust the current, you can adjust the light at will, making the light clearer and softer, making people feel more comfortable.

　　3.2 Light source selection

　　a) On-site environmental lighting of construction sites, wharfs, ports and steel plants, using multiple sets of LED sub-control smart light sources  replace high-pressure sodium lamps or metal halide lamps;

　　b) Indoor lighting of the building site, using multiple sets of low-power low-voltage lighting products  replace metal halide lamps;

　　c) Construction living area, low-voltage LED lighting products.

　　d The lighting of the steel plant is simulated according  the length, width and height of the plant. How much LUX is required  reach the ground, using the ceiling installation method, which has been installed at 4*4/6*6 intervals. The replacement of lamps in large steel plants can greatly reduce the cost Electricity cost.

　　e Traditional lamps used in ports and wharves cannot be wind, earthquake, and salt spray resistant. LEDs have developed various standard lamps according  different manufacturers.

　　4. Comparison of energy-saving lighting for construction sites, wharfs, ports and steel plants

　　It can be seen that when the electricity bill is calculated at 1.1 yuan, 1 LED wer crane searchlight saves electricity bills of 16,300 yuan/year (16.3÷10)

　　When the electricity bill is calculated at 1.3 yuan, one LED wer crane searchlight saves 19,26 yuan/year (19.26÷10)

　　Conservative estimate: use -LED wer crane searchlight

　　One year One save 10,000 yuan One 10 save 100,000 yuan One hundred save 1 million yuan

　　3 years 30,000 yuan for 1 cup 300,000 yuan for 10 cups 3 million yuan for 100 cups

　　In 10 years, one unit saves 100,000 yuan, 10 units saves 1 million yuan, 100 units saves 10 million yuan

　　It can be seen that this item alone can save 148.19 million kilowatt-hours of electricity in one year. If the electricity bill per kilowatt-hour is 1.1 yuan, it can save 163,000 yuan in electricity bills every year, and it only takes about half a year  save electricity. The investment in LED lamps can be recovered, and the service life of the overall LED lamps is greater than 50,000 hours, which means that they can be used for at least 10 years. From the comparison of L