Heat exchange vertical kiln

Abstract

The invention provides a heat exchange vertical kiln. By the adoption of the heat exchange vertical kiln, heat exchange can be conducted on materials of different particle sizes, continuous feeding can be conducted, the resistance force of smoke is small, the effective material column height can be adjusted, materials are free of getting stuck and being leaked, and air leakage is avoided. The heatexchange vertical kiln comprises a cylinder. The upper portion of the cylinder is provided with a material supplying device and an exhaust device. The lower portion of the cylinder is provided with adischarging device. At least one abrupt change section is arranged on the portion, between the material supplying device and the discharging device, of the cylinder. The part, located above the abrupt change section, of the inner cavity of the cylinder is small in the horizontal dimension. The part, located below the abrupt change section, of the inner cavity of the cylinder is large in the horizontal dimension. When the materials flow downwards, a cavity which the materials cannot naturally reach is formed below the abrupt change section. Outlets of gas supply pipelines of a gas medium conducting heat exchange with the materials communicate with the cavity. When used as a preheater, the heat exchange vertical kiln further comprises a smoke chamber, a feeding pipe and a rotary kiln. Inlets of the gas supply pipelines communicate with the smoke chamber. The exhaust end of the rotary kiln communicates with the smoke chamber. An outlet of the discharging device is connected with the feeding pipe penetrating through the smoke chamber and communicates with the feeding end of the rotary kiln.

Description

technical field [0001] This technology relates to a heat exchange vertical kiln that can preheat or heat or cool materials, especially a preheater that uses waste heat to preheat materials. Background technique [0002] The existing hydraulic push rod vertical preheater is to push the material to intermittently discharge through the repeated movement of the hydraulic push rod, and enter the rotary kiln through the transfer tank, and at the same time, the high-temperature tail gas of the rotary kiln enters the preheater through the transfer tank , to preheat the material of the preheater. The heat-resistant concrete "bridge" above the hydraulic push rod is often easily damaged or even collapsed due to long-term high temperature and pressure (limestone) environment, and material leakage is prone to occur. At the same time, the hydraulic push rod is easy to jam, and the air leakage is serious. Moreover, due to the small effective ventilation cross-sectional area of ​​the tran...

AI Technical Summary

Problems solved by technology

Due to the high temperature of the flue gas, it is necessary to set up a cooler for the flue gas or mix cold air to reduce the temperature of the flue gas before dust removal. After mixing cold air, it requires a large selection of dust collectors and induced draft fans, which increases the investment in bag filter and induced draft fans. , also increases the power consumption and cost of the production run

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