Top burning hot blast stove using annular airflow spray upward with premixing combustion and reflux heating

Abstract

The invention relates to a top-firing hot blast furnace which adopts upper spraying, premixing, firing, reflux and heating by annular airflow and effectively solves the problems of the rationality and stability of the fluid flow in the hot blast furnace and the sufficiency and uniformity of the mixing of different fluids. The top-firing hot blast furnace has the following structure: a vault is positioned on a burner of the upper part of a furnace body; the lower part of a furnace grate under the furnace body is provided with a cold wind chamber; a flue gas outlet pipe and a cold wind inlet pipe are arranged on the sidewall of the cold wind chamber; a combustion chamber is formed between a straight cylinder part on the upper part of the burner and the vault; a hot blast outlet pipe is arranged on the straight cylinder part; the lower part of the burner is provided with a heat storage chamber; the outer wall of the burner is positioned on an outer supporting annular plate of the upper part of the furnace body; the inside of the burner is separated into a coal gas distribution circuit and an air distribution circuit by a partition wall of an oblique circuit; the outer ends of the coal gas distribution circuit and the air distribution circuit are provided with a coal gas inlet pipe and an air inlet pipe respectively; a conduit is formed between the upper parts of the outer wall and the inner wall of the burner; the coal gas distribution circuit and the air distribution circuit are connected with an annular airflow premixing conduit through the respective nozzle tube distributed on the peripheral wall of the burner; and a flow equalizing and obstructing baffle plate is formed between the upper part of the conduit and the combustion chamber. The top-firing hot blast furnace has good economical and social benefits.

Description

1. Technical field [0001] The invention relates to a top-combustion hot blast stove which adopts annular airflow upward spraying, premixed combustion and backflow heating for fuel combustion and flow heat transfer in the field of thermal energy engineering. 2. Background technology [0002] The hot blast stove is an indispensable and important auxiliary equipment in blast furnace ironmaking. It is a combination of a combustion device (consisting of a burner and a combustion chamber) and a heat transfer-regeneration device (consisting of a regenerator and checker bricks). The difference in the relative position of the two devices can be divided into internal combustion type (two devices are placed in parallel and in a cylindrical device), external combustion type (two devices are placed in parallel and each is placed in a cylindrical device) and top combustion type (the two devices are placed up and down, and the combustion device is on top) three large structural forms. As ...

AI Technical Summary

Problems solved by technology

Throughout the existing hot blast stove combustion devices, there are problems of varying degrees in structure and combination, often appearing in the hot blast stove. Combination between the device and the vault), resulting in incomplete or unstable combustion, poor load regulation performance, etc.

If there are structural problems in the coordination between the combustion device and the heat transfer-regenerator body, it will result in poor heat transfer effect of the hot blast stove and low utilization rate of the heat storage body

Such a hot blast stove obviously cannot meet the requirements of the blast furnace for the air volume and temperature of the hot blast, let alone the high efficiency, energy saving and environmental protection of the hot blast stove, and it cannot operate safely and stably at high hot blast temperatures

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