Partial premixed combustion device and method of oxygen-enriched combustion internal heating type coal low-temperature dry distillation furnace

Abstract

The invention discloses a partial premixed combustion device and method of an oxygen-enriched combustion internal heating type coal low-temperature dry distillation furnace, and belongs to the field of low-temperature dry distillation in the coal chemical industry. Oxygen-enriched air and coal gas are quantitatively conveyed to the conical premixing section of the sleeve type combustor under the control of the flow meter and the adjusting valve to be partially premixed and then enter the combustion chamber formed by partitioning in the flame path, backmixing of excessive unburned or low-temperature coal gas can be increased through the combustion chamber, the hot-spot temperature of a combustion area is reduced, and the combustion efficiency is improved. Oxygen-enriched air and coal gas are subjected to partial premixed combustion in the combustion chamber and then enter the rear section of the flame path through an outlet of the combustion chamber to form a mixed gas thermal medium (including combustion products and excessive coal gas) with uniform temperature, and the mixed gas thermal medium enters the dry distillation furnace through fire holes in the side wall of the flame path to provide heat for low-temperature dry distillation of coal. According to the device and the method, the technical problem of instability of dry distillation products caused by non-uniform and over-temperature temperature at the fire holes is solved.

Description

technical field [0001] The invention belongs to the field of low-temperature dry distillation of coal chemical industry, and in particular relates to a partial premixed combustion device and method of an oxygen-enriched combustion internal heat type coal low-temperature dry distillation furnace. Background technique [0002] Low-metamorphic coal is rich in resources, and low-temperature dry distillation to obtain gas, semi-coke and tar is an effective method for low-metamorphic coal classification and utilization. At present, the vertical internal heating furnace is mainly used. The main process is: add lump coal from the top of the furnace, gas and air are blown in from the lower part of the furnace, and burn in the fire channel to generate high-temperature gas, which runs opposite to the coal in the furnace to realize heat exchange and make Volatile matter and tar in coal are separated to realize low-temperature dry distillation. Since the combustion is supported by air, ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a partial premixed combustion device and method for an oxygen-enriched combustion internal heating coal low-temperature carbonization furnace, which solves the problem that the existing furnace type directly implements oxygen-enriched combustion, which is prone to local overheating of the burner and the fire channel, thereby causing Problems of slagging during the operation of the retort furnace, uneven temperature distribution of the furnace section, and unstable quality of retort products

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