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High-energy transformers have historically been a key component in small and medium-sized factories across China. Equipment from the 1980s was notably large, primarily due to the limited production capabilities at the time. Back then, society was rapidly developing, and the high energy consumption of such equipment became a major concern for users. For example, the S7-type transformer, widely used during that era, was known for its outdated technology and high power losses. As a result, it was eventually classified as obsolete by the government.
We spoke with Li Bo, who worked in an injection molding factory several decades ago. He recalled, "We were only allowed to use one machine per day, and the factory manager would constantly supervise us in the workshop to prevent any waste of electricity. Even with these strict measures, our monthly electricity bill was still extremely high and worrying." However, after implementing energy-saving upgrades on the injection molding machines, the costs dropped significantly.
With the rapid development of technology and the growing emphasis on energy conservation and environmental protection, the government has started to focus more on this issue. Many energy-saving renovation projects now receive subsidies, typically around 30%. Some companies with better financial conditions have even gone beyond the average, initiating energy-saving improvements in existing buildings. These renovations often include upgrading external walls and windows to reduce air leakage and energy waste.
Another major area for energy-saving upgrades is industrial factories, which consume massive amounts of electricity annually, significantly increasing operational costs. Energy-saving retrofits are therefore essential for these businesses. According to statistics, for a 400 kVA high-energy transformer, the annual electricity cost can be reduced by up to 38,000 yuan. With a 50% subsidy from the national energy-saving program, the cost of the renovation can be recovered within three years—compared to a 70% reduction in expenses before the upgrade.
For instance, in 2012, the Cixi Power Supply Bureau completed energy-saving upgrades on 691 S7-type transformers, totaling 11.2 MVA. The project is expected to save 2.24 million kWh annually, equivalent to reducing 807 tons of standard coal and cutting CO2 emissions, along with 7.02 tons of sulfur dioxide. This initiative brings significant economic and social benefits. For more information on energy-saving upgrades for injection molding machines, visit: http://...