System and process for realizing zero discharge of gas and steam in iron and steel plants by adopting seawater desalination

Abstract

The invention discloses a system and a process for realizing zero discharge of gas and steam in iron and steel plants by adopting seawater desalination, which belongs to the technical field of secondary energy comprehensive utilization in iron and steel plants, and particularly relates to converting gas and steam into water resource through low-temperature and multiple-effect seawater desalination. The system comprises a blast furnace gas holder, a coke oven gas holder, a converter gas holder, a gas distributing and pressurizing system, a pure combustion/blending combustion gas station boiler, a steam turbine, an industrial boiler, a steam pipe network, a complementary-energy waste-heat recovery device, a temperature and pressure reduction device, a TVC (thermal vapor compressor) device and an MED (multi-effect distillation) device. Residual gas which can not be consumed in production process of the iron and steel plants is used for a pure combustion/blending combustion gas boiler and/or the industrial boiler, and steam is produced through combustion, which is used in preparing desalinated water through the MED device with steam recovered in the iron and steel plants on the premise of reasonable classification. Compared with the prior art, the system and the process can ultimately recover gas and steam in the iron and steel plants, have good economic effects, and are applicable to the energy conservation and emission reduction of coastal iron and steel plants.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of secondary energy in iron and steel plants, and in particular relates to a system and process for converting gas and steam resources into water resources by using low-temperature multi-effect seawater desalination, which is suitable for energy saving and emission reduction in coastal iron and steel plants. Background technique [0002] Since most of the production processes of iron and steel enterprises are carried out at high temperature, the "excess energy" or "excess heat" resources are quite abundant. The recovery and utilization of gas and steam is an important content for iron and steel enterprises to achieve "energy saving and emission reduction". The recovery of gas and steam not only saves energy but also has environmental benefits. [0003] At present, there is no report of domestic and foreign iron and steel enterprises realizing zero emission of gas and steam throug...

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Problems solved by technology

[0004] The existing steel plant gas and steam recovery and utilization have the following main problems: ① a large amount of low-quality steam can not be economically utilized and discharged; ② steam is difficult t

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