Overheating turbine generating system for recovering sensible heat of converter gas

Abstract

The invention relates to a residual heat utilization technology of converter gas, in particular to an overheating turbine generating system for recovering sensible heat of converter gas, comprising a steelmaking converter, an evaporative cooling flue, a high temperature-resistant dust remover, a residual heat boiler, a refined dust remover, a steam pocket, a turbine and a generator. 1600 DEG C converter gas generated by the steelmaking converter sequentially passes through the evaporative cooling flue, a diffusion type cyclone dust remover and the residual heat boiler and then enters the refined dust remover after being cooled to below 200 DEG C, and the back part of the refined dust remover is connected with a gas recovering and discharging device; and an overheater arranged in the evaporative cooling flue transforms steam separated out of the steam pocket into overheating steam with the temperature of 350-400 DEG C and the pressure of 1.5-2.5 MPa, and the overheating steam enters the multi-inlet overheating turbine in the form of main steam to drive a turboset to generate. The invention propels the multi-inlet overheating turbine to continuously work through the matching of three sets of residual heat recovering systems of the converter so that the generating system can safely and stably run.

Description

technical field [0001] The invention relates to a recovery and utilization technology of residual heat of converter gas, in particular to a superheated steam turbine power generation system for recovering sensible heat of converter gas. Background technique [0002] Converter gas is a by-product of converter steelmaking, which not only contains a large amount of CO for combustion, but also has a high temperature sensible heat of about 1600 °C, which is of great use value. At present, there are two main dust recovery technologies for converter gas commonly used at home and abroad: the OG method and the LT method, but neither method can recover the sensible heat of converter gas below 900 °C. The current OG method produces a large amount of sewage which is difficult to treat, and the resulting environmental problems need to be solved urgently. The LT method also needs to inject steam into the high-temperature gas to reduce the temperature, and the LT method must be imported fr...

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Problems solved by technology

However, the distribution of cooling users in iron and steel enterprises is relatively scattered, it is inconvenient to use centralized air conditioning, and only saturated steam can be produced

The Chinese patent application with the application number 200910103798.1 discloses a converter gas vaporization cooling flue. A double-barrel cyclone dust collector is installed at the end of the vaporization cooling flue for rough dust removal. The external induced draft fan provides suction. The cyclone dust collector used in this technology adopts the upper exhaust, which is not suitable for this drafting condition, and the dust removal effect is not good.

[0003] At present, the power generation technology of recovering and utilizing the waste heat of converter gas has been applied, but due to the discontinuity of converter operation and the specific smelting cycle, it is necessary to configure heat accumulators to realize the uninterrupted steam supply of turbogenerator sets, and domestic converter gas is significantly Heat recovery is mainly based on the production of low-pressure saturated steam, but the efficiency of the current saturated steam turbine is low, resulting in a low utilization rate of waste heat in the converter

However, there is no literature report on the system that can effectively recover the sensible heat of converter gas below 900°C and produce superheated steam for power generation.

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