Calciner and oven method for drying desulfurized gypsum with converter gas

Abstract

The invention discloses a calcining furnace for drying desulphurized gypsum by using converter gas. The calcining furnace comprises a combustion chamber, wherein the combustion chamber is internally and symmetrically provided with six combustion nozzles; a rotary pipe kiln is fixed on the combustion chamber after passing through the combustion chamber and is provided with an external flue; a main gas duct is provided with an eye valve and a gas flowmeter; the combustion chamber is a stepped combustion chamber; the main gas duct is also provided with a gas pressure regulating valve; two ends of the gas pressure regulating valve are respectively provided with a gas pressure gauge; the rotary pipe kiln is also internally provided with a middle flue. The calcining furnace has the advantages that the converter gas is used as a heat source to dry the desulphurized gypsum, the flue gas circulating path is long, the heat exchange time is prolonged, the heat exchange effect is good, the desulphurized gypsum is uniform in heat exchange, the discharged smoke temperature is lowered, and the thermal efficiency is increased. The invention also discloses a drying method of the calcining furnace for drying desulphurized gypsum by using converter gas. By using the drying method, the condition that the performances of a refractory material and other equipment are damaged due to too fast cold and hot change can be avoided, and then the service lives of the refractory material and other equipment can be prolonged.

Description

technical field [0001] The present invention relates to a calciner and an oven method for drying gypsum, in particular to a calciner and an oven method for drying desulfurized gypsum with converter gas. Background technique [0002] In order to protect the environment, the country has issued a series of related policies to strengthen the SO 2 To monitor emissions, all thermal power plant sulfur removal equipment must carry out flue gas desulfurization, resulting in a large amount of desulfurization gypsum. The research on the comprehensive utilization of desulfurized gypsum began in the late 1970s and early 1980s. Up to now, developed countries have formed a relatively complete research, development, and application system. At present, domestic research on flue gas desulfurization gypsum mainly focuses on cement retarder, building material, construction gypsum, soil modification and so on. [0003] Converter gas is a by-product of JISCO's iron and steel production process,...

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Problems solved by technology

[0004] In the prior art, the combustion chamber of the desulfurization gypsum production line is square and vertical. During the drying process, the coal is directly dried, and the coal-fired combustion chamber distributes coal or coal powder at the bottom of the combustion chamber for combustion, and forms a flame through the flame tail. The high-temperature flue gas is partially calcined on the rotary kiln, and the flue gas is discharged into the atmosphere from the discharge port at the tail of the rotary kiln through the induced draft fan. This drying method makes the drying inside and outside uneven, and part of the hot flue gas enters with the induced draft. In the rotary kiln, the flue gas is in direct contact with the desulfurized gypsum, and it is difficult to control the moisture content of the desulfurized gypsum. Harmful substances in the flue gas will also pollute the desulfurized gypsum. The heat transfer time is short and the heat transfer rate is low.

At the same time, coal burning will generate some harmful substances such as SO 2 etc., causing secondary air pollution

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