Working principle

After quenching with water, the blast furnace slag produces a large amount of 60-95 ℃ slag flushing water, which contains enormous heat. However, it contains a large amount of solid particles and mineral fibers, and is corrosive, making it difficult to utilize its heat.

The narrow width of the plate heat exchanger channel makes it difficult for large-sized impurities in the slag flushing water to pass through, and high-density particles are prone to accumulate at the bottom of the heat exchanger, blocking the channel; Shell and tube heat exchangers are generally horizontal long straight horizontal flow channels, and the impurities in the slag flushing water are prone to sedimentation and blockage, requiring frequent cleaning and poor heat transfer efficiency.
Plate heat exchangers or shell and tube heat exchangers have obvious design flaws in the heat recovery of slag water waste heat, and corrosion, blockage, and heat exchanger cleaning have become the most headache problems in the use of slag water waste heat recovery heat pump systems. Some slag flushing water source heat pump manufacturers have made some improvements on this basis, such as equipping slag flushing water filtration devices - "anti blocking machines" - in the front section of the heat exchanger, but still need to filter the slag flushing water for heat exchange.
The blast furnace slag flushing water waste heat recovery heat exchange unit produced by our company does not have a sedimentation filtration device for slag flushing water, and directly enters the "slag flushing water heat exchanger" for heat exchange with heating water.It is diversion, not filtration, which allows the slag flushing water and impurities to smoothly spiral down in the heat exchanger, while the intermediate water flows upstream. By utilizing the motion law of the fluid and adopting the principle of inter wall heat exchange, the problem of blockage in the application of slag flushing water is solved, and the heat transfer efficiency is improved.

characteristic

shouldThe technological advantages lie in: full water heat extraction, large heat recovery, simple process, easy operation, and the ability to achieve unmanned operation; Seamless integration with the blast furnace slag flushing system without interfering with the operation of the blast furnace, suitable for various water slag flushing processes; Continuous non-stop operation during a heating season; Small footprint, easy to implement; Only extract heat without secondary pollution; Low operating costs and minimal maintenance.

scope of application

This deviceWidely applicable, it can be used for long-distance and large-scale urban centralized heating, as well as small-scale heating and domestic hot water supply in factory areas. It can be applied to both large and small blast furnaces, and can be used in metallurgical industries such as ironmaking and copper smelting, with broad application prospects.