Sewage sludge drying method and drying machine

Abstract

The invention discloses a sludge drying method and a drying machine. The sludge drying method is used to dry the sludge through the afterheat from the burning of tailings. The sludge drying method adopts a drum type drying machine in which an inner drum is sleeved with an outer drum. The method comprises the following steps: putting a heat source and the sludge respectively in the inner drum or in an interlayer between the inner drum and the outer drum; rotating the inner drum and the external drum so as to make the heat source and the sludge in the inner drum or in the interlayer between the inner drum and the outer drum roll continuously; and transferring the heat of the heat source evenly to the sludge through the wall of the inner drum so as to dry the sludge. The sludge drying machine comprises a machine frame, a supporting mechanism, the inner drum, the outer drum and a driving device, wherein the outer drum is arranged on the machine frame through the supporting mechanism; the inner drum is positioned in the middle of the outer drum; the driving device respectively drives the outer drum and the inner drum to rotate; an outer material inlet and an outer material outlet are arranged at the two ends of the outer drum respectively; and an inner material inlet and an inner material outlet are arranged at the two ends of the inner drum respectively. The sludge drying method is scientific and practical and brings about high thermal efficiency; and the sludge drying machine has a reasonable structure and low drying cost.

Description

technical field [0001] The invention relates to a drying method and equipment, in particular to a sludge drying method and a dryer which use various incineration tailings as heat sources and use the waste heat of the incineration tailings to dry sludge. Background technique [0002] Chinese Patent Publication No. CN1398336 "Method and Procedure for Co-combustion of Waste-to-Energy Equipment" discloses that a device consisting of a waste receiving and processing system, a waste co-combustion system, and a pre-calciner is used to integrate cement. A co-combustion method for the production and incineration of municipal solid waste, which involves sending the hot gas generated during the cooling of the clinker to a rotary furnace and drying the solid waste in a rotary dryer. In this method, the unfavorable materials used in the cement process produced by waste incineration are bypassed to the scrubber system and cement kiln, so that the residual slag of the waste kiln is process...

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Problems solved by technology

[0006] Hot air drying has the following defects: 1. Due to the low thermal conductivity of air, the thermal efficiency of hot air heat exchange is not high

2. In order to improve the efficiency of hot air drying, technical solutions such as increasing wind speed, increasing air volume, and hot air recycling are generally adopted. The implementation of these solutions will inevitably lead to increased blast energy consumption and increased heat loss, which is not conducive to energy conservation

3. The operating temperature of hot air drying is always high. If the material is flammable, there will be a safety hazard; if the material contains volatile pollution factors, it will easily cause secondary pollution

4. If the flue gas is used as the heat source, it will break the balance of the working conditions of the boiler, and the coal consumption will increase in order to ensure the temperature of the flue gas

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