Sludge segmented heat drying system

Abstract

The invention discloses a sludge segmented heat drying system which is characterized in that a high-temperature drying machine is respectively provided with a wet sludge inlet, a steam inlet, a dried sludge outlet, an evaporated waste gas outlet and a steam condensate outlet, and the dried sludge outlet is connected with a dried sludge inlet of a low-temperature drying machine; the low-temperature drying machine is respectively provided with a hot water inlet pipe, a hot water outlet pipe, a cold water outlet pipe, a cold water inlet pipe, a wastewater outlet pipe and a dry sludge outlet; the cold water inlet pipe and the cold water outlet pipe are respectively connected with a cooling water supply pipe and a water return pipe of the closed cooling tower; an evaporation waste gas outlet and a steam condensate outlet of the high-temperature drying machine are respectively connected with the waste heat recycling assembly, the waste heat recycling assembly is respectively provided with a hot water supply port and a hot water return port, and the hot water supply port and the hot water return port are respectively connected with a hot water inlet pipe and a hot water outlet pipe of the low-temperature drying machine. According to the system, sludge can be treated by the high-temperature drying machine and the low-temperature drying machine in a segmented mode, the low-temperature drying machine can utilize waste heat of the high-temperature drying machine through the waste heat recycling assembly, the treatment effect is improved, and energy consumption is reduced.

Description

Technical field [0001] The present invention relates to the field of sludge treatment, and more particularly to a sludge segmented hot drying system. Background technique [0002] In the existing sludge heat drying process, it is usually used by places such as discontinuation, paddle drying, thin layer drying, and the highest market share of these equipment, the most widely used. In response to such indirect heat exchange types, the outstanding problem is when the sludge "viscous region" (ie, the sludge moisture content is 50% ~ 65% range), the resistance of the sludge against the shaft will The exponential level increases, and the wear of the blade or disc will be sharply larger. [0003] A method of blending is usually used to avoid the viscous zone. But this method also brings a problem that the process system is complex and efficient. [0004] Such equipment and processes are used as a heat source, and the water consumption is usually from 1.2 to 1.3 tons of steam, but curren...

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Problems solved by technology

And please, the drying temperature of this kind of equipment is relatively low, usually works between 50-70°C, the drying speed is slow, the volume of the equipment is large, and the cost is relatively high

Moreover, this kind of equipment heats hot water with steam, and then uses hot water to heat circulating air to dry sludge. The steam works through two heat exchanges, and the consumption is lower than that of equipment such as thin-layer, disc and paddle dryers. High, usually it takes 1.4 tons of steam to evaporate one ton of water

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