Airtight external thermal type rotary furnace with same-side feed and discharge functions

Abstract

The invention discloses an airtight external thermal type rotary furnace with same-side feed and discharge functions. The airtight external thermal type rotary furnace comprises a furnace and three jackets. The jackets are arranged on the outer wall of the furnace, and a support wheel device for supporting the furnace is arranged between the jackets; an inner cavity of the furnace is provided withtube bundles which are axially distributed along the furnace, independent heat-carrying gas channels inside the furnace are formed by tube nest air inlet jackets and tube nest air outlet jackets in the three jackets and the tube bundles, and independent heat-carrying gas channels outside the furnace are formed by intermediate jackets and the outer wall of the furnace; the various jackets are sealed by flexible jacket seals; a gas outlet device and power mechanisms are arranged at the front of the furnace, the furnace can be in linkage with the power mechanisms to rotate, feed and discharge devices which are arranged on the same side are arranged at the tail of the furnace, and sealing structures are arranged on the furnace and are positioned on the gas outlet device and the feed and discharge devices. The airtight external thermal type rotary furnace has the advantages that materials in the furnace can be simultaneously indirectly heated by the heat-carrying gas channels formed by thetube bundles inside the furnace and the external jackets and accordingly can be efficiently heated; environmental pollution and energy consumption can be reduced by equipment, the heat exchange efficiency can be improved, and the operation safety of the equipment can be guaranteed.

Description

technical field [0001] The invention relates to an externally heated rotary furnace, in particular to a closed rotary furnace with the inlet and outlet on the same side, and the furnace wall and tube wall are indirectly heated. Background technique [0002] In chemical industry, metallurgy, building materials and other industries, it is often necessary to heat treatment various powder and granular raw materials to achieve the purposes of calcination, dry distillation and drying of raw materials. The rotary furnace is a kind of equipment with large processing capacity, reliable operation and strong adaptability. , plays an important role in continuous production, and the use of rotary kilns in these industries is becoming more and more extensive. [0003] At present, there are mainly three types of domestic rotary furnaces: internal heating type, external heating type and compound heat transfer type. [0004] The heat-carrying gas in the internal-heating rotary furnace direc...

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Problems solved by technology

[0004] The heat-carrying gas in the internal-heating rotary furnace directly contacts the material to be dried, and relies on convective heat transfer to exchange heat for the material, which has the advantages of high heat utilization rate and short reaction time of the material, but the material is easily polluted by the heat-carrying gas. When it is large, the specifications and manufacturing difficulty of the equipment with the processing capacity of the hot carrier gas are increased, so the processing capacity of the equipment should not be too large

[0005] The external heating rotary furnace adopts indirect heat transfer, the heat carrier does not directly contact with the material to be dried, and the heat exchange is performed on the outer wall of the furnace through the hot air jacket, and the outer wall of the furnace conducts heat transfer to the material, which has the advantages of low cost, simple operation, The advantage of stability, but its heat transfer coefficient is low. When the gas volume generated by the reaction is large, the required size of the rotary furnace is relatively large due to the layout of the inlet and outlet devices and the gas outlet device.

[0006] Duplex heat transfer adopts the combination of heat conduction and convection heat transfer, which has high heat transfer efficiency and reduces heat loss, but it is not suitable for materials that are difficult to handle after the heat carrier gas is polluted

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