Equipment capable of supplying heat by using blast furnace slag air-quenching granulated particle waste heat based on flash evaporation technology

Abstract

The invention provides equipment capable of supplying heat by using blast furnace slag air-quenching granulated particle waste heat based on a flash evaporation technology and belongs to the field ofenergy-saving technologies. The equipment comprises an air-quenching granulated waste heat recovery device, a high-temperature clean water temperature-increasing upgrading device and a deep negative-pressure multistage flash evaporation device. The air-quenching granulated waste heat recovery device comprises a Laval nozzle array and a self-flow bed type heat exchanger. The high-temperature cleanwater temperature-increasing upgrading device comprises a booster pump, a gas-water heat exchanger and a flue gas outlet. The deep negative-pressure multistage flash evaporation device is connected with a booster. According to the equipment, the high-temperature slag flow generated in the metallurgical process is subjected to high-pressure air-quenching granulation and changed into high-temperature particles, high-temperature particles exchange heat with clean water, and waste heat recovery is achieved; and after high-temperature clean water is subjected to heat exchange upgrading, the deep negative-pressure multistage flash evaporation device is introduced, and low-pressure steam obtained after flash evaporation provides a continuous stable heat source for seawater desalination equipment.By the adoption of the equipment capable of supplying the heat by using the blast furnace slag air-quenching granulated particle waste heat based on the flash evaporation technology, the blast furnace slag waste heat is used as the seawater desalination heat source, the better economical efficiency is achieved, and the operating cost of the seawater desalination equipment can be lowered.

Description

technical field [0001] The invention relates to the technical field of energy saving, in particular to a device for heating by using the residual heat of blast furnace slag air-quenched granulated particles based on the flash technology. Background technique [0002] my country is the world's largest metallurgical producer, and its annual output of steel and non-ferrous metals ranks among the top in the world. In the process of metallurgical production, a large amount of inorganic metal or non-metallic solid by-products are discharged along with metal purification and smelting, and their average discharge accounts for more than 15% of the metal output, collectively referred to as metallurgical slag. Metallurgical slag usually contains a large amount of calcium oxide (CaO), silicon oxide (SiO 2 ) and metal oxides. Calcium oxide is widely used in the construction industry and chemical industry due to its excellent flame retardancy and reducing properties; silicon oxide is on...

AI Technical Summary

Problems solved by technology

At present, the slag treatment methods adopted by many metallurgical production enterprises at home and abroad are mainly wet and semi-dry treatment methods such as stuffy pot method and water quenching method. The disadvantage is that it will produce a lot of water pollution; Sensible heat lacks an efficient and reliable industrial recovery method; the waste heat contained in the high-temperature gas produced by the commonly used dry granulation method has no effective recycling method; seawater desalination equipment that uses thermal methods to separate fresh water consumes new energy , causing environmental pollution

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