Converter flue gas waste heat boiler

Working principle

The main components of the converter flue gas waste heat boiler include the ascending flue, descending flue, horizontal flue, convection chamber, slag condensation tube bundle, convection tube bundle, header, boiler circulation pipeline, steel frame, and other parts. The rising flue, falling flue, horizontal flue, and convection chamber of the boiler are fully sealed membrane wall structures.

The high-temperature flue gas discharged from the converter enters the waste heat boiler through a water-cooled hood. After radiation cooling and four sets of convection tube bundles, the flue gas temperature drops to around 380 ℃ and is discharged outside the pipeline. It enters the dust collection system for dust purification and is then sent to the acid production system to produce sulfuric acid. At the same time, the waste heat from the recovered flue gas generates saturated steam with a pressure of 5.5 MPa.

The vaporization cooling device of the converter flue gas waste heat boiler recovers the heat in the flue gas, and the water in the vaporization cooling pipeline becomes a steam water mixture. The steam water mixture is forced to circulate into the steam drum by natural circulation or circulation pump, and is separated by the steam drum. The separated saturated steam is sent to the heat storage device through the pipeline, and after the pressure is regulated by the membrane regulating valve, it is sent to the superheater through the pipeline. After being superheated by the superheater, it becomes superheated steam (about 300 ℃), and then sent to the steam pipe network for user use.

Performance characteristics

The converter flue gas waste heat boiler has the following advantages:

1. The converter flue gas boiler adopts a horizontal or vertical arrangement, with the flue gas flushing the convection tube bundle horizontally. The flue gas passes through in one go without dead corners and will not accumulate flammable gases, ensuring safe and reliable operation.

2. Low smoke resistance and low power consumption of auxiliary equipment.

3. The smoke airflow has no turning, diffusion, or contraction phenomena, which can prevent smoke erosion and uneven distribution of fly ash, fully utilize the role of the heating surface, and avoid local ash accumulation and wear.

4. The cross-sectional area of flue gas circulation is large, the smoke velocity is economically reasonable, the tube bundle wear is small, which is conducive to the settling of smoke and dust. The pulsating airflow formed by intermittent blowing of air is utilized to make the boiler have good self-cleaning effect.

5. The water capacity of the upper drum of the converter flue gas waste heat boiler is large, with a large heat capacity and significant thermal hysteresis. In the case of large fluctuations in the imported flue gas, it ensures stable steam parameters and easy operation.

6. The transverse flushing of flue gas on the heating surface results in good heat transfer effect, high heat transfer coefficient, and high waste heat recovery efficiency.

7. The ash discharge form is automatic continuous ash discharge.

8. Wide applicability and long lifespan.

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