Temperature control device for COREX furnace gas and use method thereof

Abstract

The invention relates to the field of purification, modification and purification of a combustible gas containing carbon monoxide, and in particular relates to a temperature control device for COREX furnace top gas and a use method thereof. The temperature control device for the COREX furnace top gas includes a COREX shaft furnace (1), a gravity dust collector (21) and a dry-type bag dust collector (22), also comprised a temperature control device and a computing device, the temperature control device comprises a nozzle (211), a booster pump (31), a regulation valve (32) and a motor (33), and the computing device comprises a temperature sensor, a flow rate sensor, a differentiator, an adder, a regulator, a multiplier and the like. The use method of the temperature control device for the COREX furnace top gas is characterized in that the method comprises the following steps: A. temperature control; B. feed forward control; and C. feedback control. The system is stable performance, strong in applicability and fast in reaction speed regulation.

Description

technical field [0001] The invention relates to the field of purification, modification or purification of combustible gas containing carbon monoxide, in particular to a temperature control device for COREX furnace top gas and a use method thereof. Background technique [0002] COREX, that is, Coal-Reduction-Extreme, means to use coal directly to make iron, that is, directly use natural lump ore and lump coal, cancel the sintering plant and coking plant, and have short process, less process, light pollution, and save scarce resources. Coking coal and other advantages. [0003] In the current COREX reduction shaft furnace, the normal operating pressure of the furnace top gas is about 0.33MPa, and the normal operating temperature fluctuates periodically between 150°C and 350°C. The fluctuation period is about 10 minutes, and the fluctuation range is as high as 500°C. times or so. After the top gas is wet dedusted, the pressure energy of the top gas is recovered through the T...

AI Technical Summary

Problems solved by technology

However, due to the intermittent feeding of the reduction shaft furnace, the temperature of the top gas fluctuates violently in a wide range with the charging of the furnace top, and the reasonable use temperature range of the bag filter is relatively narrow. Dust removal function, if the temperature is too high, the bag will be damaged. Therefore, the top gas temperature must be maintained within a reasonable temperature range, generally 120 ° C ~ 250 ° C

Due to the particularity of COREX roof gas with high temperature, high pressure, and violent fluctuations, the current temperature control of roof gas still has defects such as inaccurate control and untimely temperature control, which affects subsequent energy recovery and utilization.

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