Utilization of Excess Dry-Quenching Gas: Operational Experience
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Utilization of Excess Dry-Quenching Gas: Operational Experience S. A. Kravchenkoa, *, S. Y. Abdullina, **, A. A. Kachuraa, ***, and O. M. Smirnovb, **** a
Giprokoks, Kharkov, Ukraine PAO Severstal, Cheropovets, Russia *e-mail: [email protected] **e-mail: [email protected] ***e-mail: [email protected] ****e-mail: [email protected] b
Received February 17, 2020; revised February 17, 2020; accepted May 7, 2020
Abstract—The operation of two systems for utilizing excess gas in dry-quenching systems is described. Keywords: coke, dry quenching, circulating gas, waste-heat boiler DOI: 10.3103/S1068364X20080025
Environmental protection is a growing priority around the world. Industrial enterprises are the basic pollution sources. At coke plants with dry quenching of the coke, excess circulating gas is produced and must be constantly removed from the closed gas loop [1, 2]. In the present work, we consider two operational systems for utilization of the excess circulating gas and report relevant operational experience. GAS DISPOSAL IN AN ADDITIONAL BOILER The excess gas formed in dry-quenching systems must be constantly removed from the circulation loop by cold flaring. The gas is inert to coke, but it contains coke dust and carbon monoxide, whose release to the atmosphere is governed by environmental standards. Giprokoks has developed a method of utilizing the excess gas in dry-quenching systems by combustion in a mixture with coke-oven gas. At PAO Severstal, the Giprokoks design has been adopted in the dryquenching system at coke batteries 7 and 8. Excess circulating gas from three dry-quenching modules, each of productivity 60 t/h, is sent to the Giprokoks system, which is based on a KO-10 boiler. This is the first use of the Giprokoks system for the disposal of excess dryquenching gas, which is intended to provide benefits in terms of environmental protection and energy conservation. The boiler design was developed by specialists at the Alekseev boiler equipment plant (AO ZKO, Belgorod region, Russia), in collaboration with OAO PTP Ukrenergochermet (Kharkov, Ukraine). It was manufactured by AO ZKO. The KO-10 boiler is located in the building that houses the dry-quenching system at coke batteries 7 and 8. The KO-10 steam
boiler with forced circulation and a U-shaped heatingsurface array is intended to utilize the heat of the excess circulating gas from dry-quenching units 73–75 in generating superheated steam (pressure 3.9 MPa, temperature 440°C). The boiler is also capable of processing the circulating gas from modules 71 and 72. In passing through the boiler, the gas encounters the following heating surfaces: a preliminary evaporation surface; a steam heater; an evaporation surface; and a waste-gas heater. Forced gas circulation is employed in the boiler. The temperature of the superheated steam is regulated by means of a surface steamcooling system. To eliminate low-temperature corrosion, the water is warmed in a water–water heat exchanger before supply to the waste-gas heater. Coke-oven gas i
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