Coke dry quenching method for coal coking device

Abstract

The invention discloses a coke dry quenching method for a coal coking device. The coke dry quenching method is suitable for a semi-coking device. Usually, multiple coking chambers share a coke quenching system. The coke dry quenching method comprises that 1, hot coke from the bottom of a coke cooling section of a coking chamber is pushed to a hot coke transferring warehouse V1 by a coke pusher J1; 2, the hot coke is regularly discharged into the hot coke transferring warehouse V1 by a V1 charging valve and then the V1 charging valve is closed; and after the hot coke transferring warehouse V1 is pressurized by gas from a coke quenching tower T1, the hot coke is regularly discharged into the coke quenching tower T1; 3, the coke quenching tower T1 is operated under pressurized conditions and the hot coke moves from bottom to top under the action of gravity and contacts with inert gas such as CO2 flowing from bottom to top so that a temperature of the hot coke is reduced; and the cold coke is pushed into a cold coke transferring warehouse V2 by a coke pusher J2; 4, the cold coke is regularly discharged into the cold coke transferring warehouse V2 by a V2 charging valve and then the V2 charging valve is closed; and after the cold coke transferring warehouse V2 is deflated so that a cold storage chamber V3 is depressurized, the cold coke is regularly discharged into the cold storage chamber V3 or is transmitted into the cold storage chamber V3 by a belt; and 5, hot heat-carrying gas G2 departing from the coke quenching tower T1 enters into a spray tower T2 and then carries out counter-current contact with recycled cold spray water W1 so that the hot heat-carrying gas G2 is cooled by heat transmission; and the cooled gas as G1 is fed back to the coke quenching tower T1 for recycle.

Description

technical field [0001] The invention relates to a coke dry quenching method for a coal coke production device, in particular to a coke dry quenching method for a coal semi coke (blue coke) device. Background technique [0002] At present, an imperfection in the coal-to-semi-coke industry coexists: Regardless of the internal heating or external heating technology, semi-coke quenching adopts water quenching to quickly extract heat, and then water quenching goes through the drying and dehydration process to control The final water content of the semi-coke product. [0003] As we all know, the Anshan Thermal Energy Research Institute of China Iron and Steel Group began to continuously research and develop in the early 1980s the technology of "using non-caking coal or weakly caking coal lump coal as raw material to make semi-coke for ferroalloy in vertical carbonization furnace" (hereinafter Sinosteel Coal Conversion Technology BT for short), adopts suitable coal sources (such a...

AI Technical Summary

Problems solved by technology

[0005] ②Water quenching causes anhydrous hot charcoal to become water-containing cold charcoal, with a water content of 7.5 tons / hour, accounting for about 10% of the semi-coke product volume; in order to reduce moisture, correspondingly increase the drying and dehydration steps, usually using indirect heating in a drying kiln or Gas combustion flue gas is directly heated and dried, resulting in low heat transfer efficiency, high energy consumption, and large system investment;

[0007] ④ The drying process of coke containing water causes water loss and gas consumption

[0011] ③Low energy utilization rate in the drying process: during direct drying, due to the small temperature difference, low operating pressure, and low density of direct heat transfer gas phase medium, the heat transfer effect is poor and the equipment is huge; during indirect drying, the operating pressure is low and direct The density of the heat transfer gas phase medium is low, the heat transfer effect is poor, and the equipment is huge. If you want to improve the heat transfer efficiency and increase the heat transfer temperature difference, the energy level will be seriously wasted;

[0012] ④ The recycling rate of materials in the drying process is zero: all the flue gas and water vapor are discharged into the atmosphere, and no components are recovered;

This method cannot be directly applied to the CDQ process of semi-coke, because the temperature of semi-coke leaving the carbonization furnace is only 200-300 ° C, and the heat exchange temperature difference with the inert gas after the temperature is 120-150 ° C is too small, and the size of the heat transfer system equipment Huge, and the process and equipment for coke unloading from the coke oven to the quenching oven are complicated and the investment is huge, so it is not applicable

[0019] Method of the present invention has no report

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