Super-critical, high-pressure steam, tripe section-type waste heat boiler with dust removal function

Abstract

The invention discloses a super-critical, high-pressure steam, tripe section-type waste heat boiler with dust removal function and can be used for the recovery of flue dust and waste heat of large-scale smelting furnaces and industrial furnaces. The boiler is characterized in that a honeycomb duct introduces the flue gas in a furnace and causes a spiral movement thereof; the cavity of a primary boiler is a spreading-type cyclone dust extractor with large diameter, the upper part of which including the honeycomb duct is the first-section waste heat boiler which generates super-critical high-pressure steam, and the lower part of which is the second-section waste heat boiler which produces superheated water used for supplementing the water consumption when the steam is produced in the first section; the cavity of the second-section boiler is a dust extractor which is formed by the parallel connection of a plurality of spreading-type cyclone dust extractors with small diameter, which is the third-section waste heat boiler of the waste heat recovery system and used for cooling the hot water by heating the furnace and supplementing the water consumption in the second section; and the automatic computer control device leads the system performance to be greatly improved and the gas production to be stable. As a proposal in which two dust extractors are connected in series is adopted, the dust removal efficiency can be improved, the heat exchange area can be enlarged, and the thermal efficiency can be improved.

Description

technical field [0001] The invention relates to a high-efficiency waste heat boiler with better dust removal function, which is used in large-scale smelting furnaces and industrial kilns, is environmentally friendly and has waste heat recovery. Background technique [0002] In the current prior art, the dust collector and the waste heat recovery boiler are two different components. From the perspective of waste heat recovery, the waste heat boiler should be placed in the first stage, but because the standard waste heat boiler only considers how to improve the heat exchange coefficient between the boiler wall and the waste gas, it ignores the waste gas of most smelting furnaces and industrial furnaces. It contains a lot of dust, and some also contain coal tar with extremely high viscosity (such as the furnace gas of a large closed calcium carbide furnace). Due to the existence of these dusts and sticky substances, they will attach or stick to the heat exchange tube wall of t...

AI Technical Summary

Problems solved by technology

Due to the existence of these dust and viscous substances, they will adhere or stick to the heat exchange tube wall of the waste heat boiler, which will reduce the heat exchange efficiency of the waste heat boiler. The road is blocked, so that the waste heat boiler cannot work normally

If the waste heat boiler is placed on the second stage, and the dust collector is placed on the first stage, the dust collector will work at a high temperature above 700 degrees Celsius, and the dust collector will become a radiator, which will cause a large amount of exhaust heat to be lost. Excessive temperature It is also not conducive to the normal work of the dust collector

The waste heat boiler in the second stage is partially consumed by the dust collector due to the waste heat of the waste gas, so the temperature of the waste gas is low, and the thermal efficiency of the waste heat boiler is reduced. Generally, it can only produce low-pressure steam (below 1M Pa) or hot water

[0003] Except that the existing waste heat boilers cannot be used for flue gas with high concentration of dust and viscous substances, most of them only consider the production of low-pressure steam or hot water, which has little utilization value

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