System for dragging converter flue gas induced draft fan by aid of converter steam

Abstract

The invention discloses a system for dragging a converter flue gas induced draft fan by the aid of converter steam. The system comprises a waste heat boiler unit, the converter flue gas induced draft fan, a steam heat storing and flow stabilizing unit and a steam turbine set unit. The waste heat boiler unit comprises a waste heat boiler, a steam drum and an oxygen remover, middle-low-pressure steam is generated after cooling water in a vaporization cooling flue of a converter is heated, and is gathered in the steam drum, and saturated steam is generated by a pressure-control exhaust valve; the steam heat storing and flow stabilizing unit comprises heat storage devices and a control valve, the saturated steam is stored in the heat storage devices, and steam with stable flow can be assuredly supplied; the steam turbine set unit comprises a steam turbine, a condenser, a condensate water pump, a steam seal heater and a low-temperature heater, the steam does expansion work in the steam turbine and then is exhausted into the condenser to be condensed to obtain water, the water is pressurized by the condensate water pump and flows through the steam seal heater and the low-temperature heater, then oxygen in the water is removed by the oxygen remover of the waste heat boiler unit, and water without the oxygen is pressurized by a feed water pump of the vaporization cooling flue of the converter and flows through a high-temperature flue of the converter; the converter flue gas induced draft fan can be dragged by the steam turbine to run.

Description

technical field [0001] The invention belongs to the technical field of converter waste heat utilization, and in particular relates to a system for driving a converter flue gas induced draft fan by using converter steam. Background technique [0002] The converter steelmaking method is the most important steelmaking production method in the world, and more than 80% of my country's steel output comes from the converter. Each steelmaking cycle of converter steelmaking includes processes such as charging molten iron, oxygen blowing smelting, pouring molten steel, etc., and intermittently generates smoke containing a large amount of dust and toxic and explosive gases. The main gas components of converter flue gas are CO, CO 2 and N 2 Etc. If a large amount of toxic and explosive gases such as carbon monoxide leak, it will cause serious harm. At the same time, the converter flue gas also contains a large amount of waste heat, the flue gas temperature is as high as 1400-1600 °C,...

AI Technical Summary

Problems solved by technology

There are more than 600 40-100 ton converters in my country. Converter steelmaking will generate a lot of waste heat. At present, there are converter waste heat power generation technology in China, and there is also motor steam turbine mixed drag dust removal fan technology, but the utilization rate of power generation recovery waste heat is relatively low. The power of the waste heat generating set is relatively small, and the market application is not high. The hybrid drive technology does not have a steam stabilization device. The motor will be in a fluctuating operating state to adapt to the change of the system working conditions, and the service life will be significantly reduced.

At present, there is no technology in China to use the steam produced by the waste heat of converter flue gas to drive the dust removal fan

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