A detection method and detection device for the thermal performance of iron coke

Abstract

The invention discloses a method and a device for detecting ferrous coke hot-state performance. The method comprises the following steps of: taking 200-400+ / -5g of ferrous coke sample with the particle size of 21 to 25mm, measuring the ferrous coke hot-state performance in a heating system, analyzing a carbon content change rate in the sample before and after reaction by using a chemical analysis method, taking the carbon content change rate as a reaction index of the ferrous coke, measuring change of CO2 and CO concentration in the reaction process by employing a gas analyzer, and determining the initial reaction temperature and maximum reaction rate temperature of the ferrous coke. The detection device comprises an electric furnace, wherein a silicon carbide rod in the electric furnace is communicated with a precision temperature controller; a high-temperature alloy steel reactor is inserted into the electric furnace; a temperature control thermocouple is arranged in a ferrous coke sample layer; a gas inlet tube is sequentially communicated with a flow regulator and a flowmeter; an electric furnace heating and keeping system is controlled by the precision temperature controller; and gas detection and data processing in the reaction process are processed by a gas monitoring and data processing system.

Description

technical field [0001] The invention belongs to the technical field of coking, and relates to a detection method and a detection device for the thermal performance of iron coke used in a blast furnace. Background technique [0002] Japanese scholars used the RIST operation line diagram to further develop and study the reaction mechanism of the blast furnace, and proposed a new concept of blast furnace smelting in the low-temperature storage zone (hot empty zone), and studied that reducing the blast furnace storage zone can greatly reduce ironmaking energy consumption and reduce CO 2 Therefore, some technical measures have been developed, such as high-reactivity coke technology, carbon-containing hot-pressed pellet technology, etc. Iron coke is coal and iron ore crushed, mixed and formed in advance, and then heated in a retort furnace to partially reduce the iron ore in it to become reduced iron coke with a certain metallization rate. Since the metal iron in iron coke has a ...

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Problems solved by technology

[0008] The method and device proposed in the above patents and documents are used to detect the thermal performance of iron coke, and there are the following problems: (1) it is unscientific to represent the reactivity of iron coke by the change of mass before and after the reaction, because iron coke and CO 2 During the reaction process, not only the carbon in the iron coke undergoes a dissolution reaction to cause a decrease in mass, but also the metallic iron in the iron coke is catalyzed by CO 2 Oxidation to iron oxides leads to an increase in mass

(3) The existing coke reactivity measurement standard is to react with carbon dioxide at a certain temperature for 2 hours, which cannot truly simulate the behavior of coke in the blast furnace (coke passing through the storage belt is a slow heating process)

(4) Some measurement methods cannot measure important parameters such as the starting reaction temperature of iron coke and the maximum reaction rate temperature

[0009] If the current coke reactivity and post-reaction strength test methods are used to detect the reactivity of iron coke, it may mislead the evaluation of the high temperature performance of iron coke, and lead to unreasonable use of scarce strong caking coal

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