Project Introduction: Deep cooling of flue gas from low-temperature waste heat recovery is an important means of saving energy. It is an effective method that recovers the low-temperature waste heat about to be discarded in industrial processes through high-efficiency heat exchange technology. This waste heat can generate hot water or steam, which can then be used for living and production purposes. The most effective one is the low-temperature waste heat power generation technology, which uses waste heat to produce superheated steam for power generation. For example, the pure low-temperature waste heat power generation dual-pressure technology in cement lines fully utilizes the large amount of low-temperature exhaust gas waste heat below 350°C discharged by the cement kiln. Through a dual-pressure waste heat boiler, superheated steam is generated, which drives a double-entry steam turbine to perform work and generate electricity. Taking a 5000t/d dry process cement production line with a matching pure low-temperature waste heat power generation project as an example, it generates more than 70 million kWh of electricity per year, equivalent to burning 30,000 tons less standard coal annually and reducing emissions of more than 70,000 tons of carbon dioxide into the atmosphere. The energy-saving effect can reach 25%. At the same time, the exhaust gas emission temperature of cement kilns is reduced from the original 250°C to below 90°C, which greatly reduces the thermal pollution of waste gases to the environment and is beneficial to environmental protection. The following achievements are available with this technology: (1) Thermal calculation, hydraulic calculation, strength calculation, and overall technical integration for vertical and horizontal cement kilns, ferroalloys, chromium salts, ferronickel, various kilns, converters, and waste heat boiler system optimization development and design; (2) Multi-stage uniform flow and anti-wear technology and design at the inlet of waste heat boilers; (3) Research and design of ash cleaning and removal devices for waste heat boilers; (4) Low-temperature flue gas waste heat deep recovery technology and corrosion protection technology for power station boilers.