A comprehensive and efficient power generation method and power generation system for iron and steel enterprises

Abstract

The invention discloses a comprehensive and high-efficiency power generation method of surplus energy in iron and steel enterprises and a power generation system thereof. The power generation method includes the steps of gas supplementary combustion waste heat steam, sintering cooler waste heat recovery, sintering machine waste heat recovery, and steam power generation; the power generation system includes a steam heating boiler connected to the steam outlet of the converter steam boiler through a converter steam heat accumulator, The fuel inlet of the steam heating boiler is connected with the by-product gas, and it is installed in the dual-pressure waste heat boiler of the sintering cooler. The dual-pressure waste heat boiler is provided with a saturated steam outlet and a superheated steam outlet. The outlet, the superheated steam outlet of the dual-pressure waste heat boiler and the steam outlet of the waste heat boiler of the sintering machine are connected to the steam-admission steam turbine, the saturated steam outlet of the double-pressure waste heat boiler is connected to the low-pressure section of the steam-admission turbine, and the steam-admission turbine drives the generator to generate electricity. The invention has the characteristics of high comprehensive utilization rate of residual energy, good power generation stability and low operation and maintenance cost.

Description

technical field [0001] The invention belongs to the technical field of residual energy power generation, and relates to a comprehensive and efficient residual energy power generation method and a power generation system for iron and steel enterprises with high comprehensive utilization rate of residual energy, strong power generation capacity, good power generation stability, and low operation and maintenance costs. Background technique [0002] The total energy consumption of the iron and steel industry accounts for about 15% of the total energy consumption in the country. Iron and steel production is mainly based on high-temperature smelting and processing, and a large amount of waste heat energy is generated in the production process, mainly from the sensible heat of flue gas from sintering machines, sensible heat of red coke, Various waste heat resources such as converter flue gas and waste heat recovery devices at the bottom of heating furnace account for about 68% of th...

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Problems solved by technology

Since there are many factors that affect the recovery efficiency of sintering waste heat, such as the output of sintering ore, combustion temperature, material layer thickness, speed of cooling machine, initial temperature of cooling medium and flow rate of exhaust gas, etc., there is a low utilization rate of waste heat resources in sintering low-temperature waste heat power generation process. , low operating rate of generator sets, etc.

However, the sintering waste heat is used for combustion air, preheating the mixture or using the waste heat recovery device to generate steam, and the recycling efficiency is not high

Especially at the present stage with the large-scale sintering machine, the traditional way of waste heat utilization can no longer make full use of waste heat resources to maximize the benefits

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