A method for utilization of waste heat using converter waste heat steam comprehensive utilization system

Abstract

Provided is a converter waste heat steam comprehensive utilization system. A steam-water separator is additionally arranged at the position, before entering a steam turbine, of one side of a steam pipeline, one way of superheated steam is led in from a steam main pipe of a factory and fed into the position, located in front of the steam-water separator, of the steam pipeline, the led-in superheated steam and saturated steam generated by a heat accumulator are mixed before entering the steam-water separator, it is guaranteed that the superheat degree of the steam is above 5 degrees, and the steam is conveyed backwards; the heat accumulator is additionally arranged in the part, before the position where the superheated steam is led in, of the steam pipeline. Meanwhile, the invention discloses a converter waste heat steam comprehensive utilization method. When the converter waste heat steam comprehensive utilization system runs normally, the steam dose not need to pass through the steam-water separator, resistance can be reduced, the enthalpy value reduction amount of the steam obtained after the steam passes through the steam-water separator can be reduced, the overall efficiency of a steam-turbine generator can be improved, water erosion of a last stage blade of the steam turbine can be greatly reduced, and safe and efficient operation of the steam turbine can be guaranteed. Meanwhile, the influence on operation safety of the steam turbine of the superheated steam at 5 superheat degrees is avoided, and steam parameters are increased.

Description

technical field [0001] The invention belongs to the metallurgical industry, and mainly relates to the comprehensive utilization of waste heat of a converter in the metallurgical industry, and also relates to the application of a low-parameter steam turbine generator set. Background technique [0002] More than 90% of my country's steelmaking production adopts the converter steelmaking process, and a large amount of high-temperature flue gas is generated during the converter steelmaking process, and the temperature is as high as 1600 °C. In order to protect the fume hood of the converter, coils are generally made in the fume hood, and softened water is introduced to take away the heat. Therefore, in each converter smelting cycle, a large amount of steam is generated, and due to the periodicity of converter smelting, this steam There is also an obvious periodicity. Specifically, in general, only one-third of a converter liquid volume cycle produces steam, and this steam can b...

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Problems solved by technology

However, there are a series of problems in the scheme: 1. There is no need to install a steam-water separator before the accumulator, because the steam generated in the steam production cycle of the converter is superheated steam, and there is no need to remove water, and the steam produced after passing through the accumulator is also saturated steam , adding a steam-water separator does not make any sense, on the contrary, it will increase the steam pressure loss; 2. The steam flashed out of the heat accumulator is saturated steam, and the steam has already carried water before entering the steam turbine due to reasons such as heat dissipation and pipeline resistance. It poses a threat to the safe operation of the steam turbine; 3. Due to the serious water in the steam, the use of a low-pressure saturated steam turbine with intermediate reheating cannot solve the problem of water erosion of the last stage blade of the steam turbine, and will increase the complexity of the system

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