Reducing roasting flue gas and roasting finished product waste heat comprehensive recovery device and method

Abstract

The invention discloses a reducing roasting flue gas and roasting finished product waste heat comprehensive recovery device and method. The device comprises a reducing roasting rotary kiln, a heat exchange rotary cylinder, a flue gas waste heat boiler and a flue gas post-processing system, wherein the heat exchange rotary cylinder is arranged obliquely, the front end of a cylinder body is higher than the rear end of the cylinder body, the front end of the cylinder body communicates with a discharge port of a kiln head of the reducing roasting rotary kiln, the rear end of the cylinder body communicates with a kiln tail flue gas outlet of the reducing roasting rotary kiln, the communication is used for reducing roasting low-temperature flue gas and a high-temperature roasting product for heat exchanging in the cylinder, the flue gas waste heat boiler communicates with the front end of the heat exchange rotary cylinder body and is used for producing steam by using the waste heat of flue gas, and the flue gas post-processing system communicates with the flue gas waste heat boiler and is used for removing dust and cooling. The device and the method comprehensively recover the reductionroasting low-temperature flue gas waste heat and the roasted finished product waste heat to produce the steam, the steam can be used for subsequent power generation, heating in the production processor domestic heating, and the purposes of effective recovery of secondary energy, energy saving and emission reduction are achieved.

Description

Technical field [0001] The present invention mainly relates to the technical field of utilization of metallurgical waste heat, and in particular to a method which is mainly suitable for siderite symbiosis ore and siderite, limonite, middle and low-grade manganese oxide ore, low-grade laterite nickel ore, and low-grade lead oxide Device and method for comprehensive utilization of waste heat in reduction roasting treatment of low-grade metal ore such as zinc ore and zinc leaching residue. Background technique [0002] With the rapid development of my country’s iron and steel industry, the high-grade and easy-to-select iron ore resources are on the verge of exhaustion. The rational development and utilization of complex and difficult-to-select poor and miscellaneous iron ore resources will alleviate the contradiction between my country’s iron ore supply and demand and promote the development of my country’s iron ore Important practical significance. In recent years, the domestic dep...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a device and method for the comprehensive recovery and utilization of the waste heat of the low-temperature flue gas of reducing roasting and the waste heat of roasted products in view of the technical problem that the existing waste heat is not economically utilized.

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