External heating type high-quality activated carbon high-efficiency energy-saving environment-friendly rotary activation furnace and application method thereof

Abstract

The invention relates to an external heating type high-quality activated carbon high-efficiency energy-saving environment-friendly rotary activation furnace and an application method thereof. The external heating type high-quality activated carbon high-efficiency energy-saving environment-friendly rotary activation furnace comprises a rotary furnace barrel, an external heating furnace body, an activated tail gas recovery combustion system and a flue gas recovery heat exchange system, and further comprises a hot water recovery steam generation system, a steam overheating system and an air preheating system. The annular furnace cavity is divided into a plurality of combustion chambers and a smoke collecting cavity, a plurality of gas burners are arranged on the outer circumferential wall ofthe outer heating furnace body corresponding to the combustion chambers, and the rotary furnace barrel is sleeved with a heat radiation heating body. The application method of the activation furnace comprises the following steps: during blow-in production, auxiliary gas and quantitative air are mixed and combusted to indirectly heat the rotary furnace barrel; a carbonized material is fed into thefurnace barrel, and activation reaction is carried out on the carbonized material and auxiliary water vapor to generate activated carbon and activated tail gas; the activated tail gas exchanges heat,is cooled and then is mixed with quantitative hot air for combustion to replace auxiliary gas; and circulating hot water is fed into a tail gas and flue gas waste heat boiler for heat exchange to generate a large amount of water vapor to replace auxiliary water vapor. The rotary activation furnace significantly improves the quality and yield of activated carbon, and is energy-saving and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of activated carbon production, in particular to an external heating type high-quality activated carbon high-efficiency, energy-saving and environment-friendly rotary activation furnace and an application method thereof. Background technique [0002] Activated carbon rotary activation furnace can be divided into two types: internal heating type and external heating type according to the heating method. [0003] The furnace cavity of the internal heating rotary activation furnace is mostly constructed of refractory bricks and insulation materials, and the heat required for its activation is provided by the oxidation reaction of the air entering the furnace cavity and the activated tail gas generated by the activation reaction of high-temperature carbonized materials in the furnace cavity. , its defect is: 1, part of the carbonized material in the furnace cavity inevitably oxidizes with the air entering the fu...

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Problems solved by technology

[0003] The furnace cavity of the internal heating rotary activation furnace is mostly constructed of refractory bricks and insulation materials, and the heat required for its activation is provided by the oxidation reaction of the air entering the furnace cavity and the activated tail gas generated by the activation reaction of high-temperature carbonized materials in the furnace cavity. , its defect is: 1, part of the carbonized material in the furnace cavity inevitably oxidizes with the air entering the furnace cavity, thereby reducing the charcoal yield of activated carbon; If the temperature is too high, it will not only cause uneven activation of the carbonized material and affect the quality of the activated carbon, but also cause the slagging of the carbonized material and impurities to block the activation channel and affect the normal operation of the rotary activation furnace; If it becomes loose and falls off, it needs to be shut down for maintenance in severe cases, which affects production and reduces the output of activated carbon

[0005] Because the flame produced by the combustion of activated exhaust gas directly contacts one side of the outer peripheral wall of the rotary furnace drum, the temperature at the contact point between the outer peripheral wall of the rotary furnace drum and the flame is higher than the temperature at the non-flame contact point; as the rotary furnace drum rotates slowly and uniformly , the position of any flame contact point on the outer circumferential wall of the rotary furnace tube has a periodic change in the circumferential direction gradually moving away from the flame and then gradually approaching the flame, so that the temperature of the flame contact point gradually decreases and then gradually increases However, due to the long rotation period, it is still not possible to make the temperature of the outer circumferential wall of the rotary furnace tube uniform, resulting in uneven heating of the carbonized material in the rotary furnace tube, and thus uneven activation, which is not conducive to improving the activation of activated carbon. quality and yield

[0006] The self-priming gas burner is adopted, relying on the ejection effect to inject a part of the air into the gas burner and mix with the activated tail gas for combustion, so that the amount of air entering the gas burner cannot be effectively controlled, and the amount of air entering the gas burner cannot be ensured. The activated tail gas is completely burned, resulting in a waste of activated tail gas; in addition, the bottom of the rotary furnace tube is connected to the atmosphere so that the self-priming gas burner can work normally, but there is still some normal temperature air passing through the outer peripheral wall of the rotary furnace tube with the high-temperature flue gas. Part of the heat is taken away during the process of exhausting the exhaust pipe to the atmosphere, thereby reducing the temperature of the outer peripheral wall of the rotary furnace tube, thereby reducing the thermal efficiency of the self-priming gas burner; in this way, the heat generated by the activation of the tail gas combustion It cannot fully meet the needs of the activation of carbonized materials in the rotary kiln, and thus requires an external auxiliary fuel to generate heat supplementation, thereby increasing energy consumption and increasing the production cost of activated carbon.

[0007] A tail gas waste heat boiler is used, and the activated tail gas generated by the activation of carbonized materials in the rotary furnace barrel enters the tail gas waste heat boiler and the steam generated by indirect heat exchange with normal temperature water cannot fully meet the needs of carbonized material activation, and auxiliary steam generation is required. The device produces water vapor supplementation, which consumes energy and thus increases the cost of activated carbon production

[0008] Since the activated tail gas cannot ensure complete combustion in the self-priming gas burner, the high-temperature flue gas generated by the activated tail gas combustion will inevitably contain harmful gases such as carbon monoxide and alkanes, which will cause damage to the atmosphere due to the direct discharge of high-temperature flue gas. Pollution

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