Coking of steel

Heating process (waste heat recovery of ammonia distillation tower)The process uses a lithium bromide absorption-type heat pump. This type of heat pump is characterized by its ability to output heat at a temperature higher than the driving heat source temperature. It can widely recover low-temperature waste heat above 60℃, generally producing high-temperature hot water or steam (via a flash tank) exceeding 100℃, meeting process heating needs. For example, in a coking plant's ammonia steaming process, the heat from ammonia steam at the top of the tower serves as the driving heat source, generating over 100℃ hot water as supplementary heat for the tower's bottom heating, saving 26,400 tons of steam annually.Refrigeration technologyBy recovering heat from circulating ammonia water in the coke plant, low-pressure steam generated from coke quenching waste heat, coke oven gas power generation, and the heat from hot water in the upper section of the primary cooler, etc., as the driving heat source for the lithium bromide unit, 16℃ cold water is produced to meet the refrigeration needs of the lower section of the primary cooler. In a coking plant example, an ammonia-type lithium bromide absorption unit with a total cooling capacity of 9,300 kW recovered the heat from ammonia water. Compared to electric refrigeration, the annual operating time is 3,600 hours.

Probably

670

kW·h

Annual energy savings

Probably

2,700

ton

Annual saving of standard coal

Probably

6,700

ton

Annual reduction of carbon dioxide emissions