Sludge superheated vapor drying system of two-stage paddle dryer and drying process thereof

Abstract

The invention relates to a sludge superheated vapor drying system of a two-stage paddle dryer. In the system, a sludge pump is connected with a feed inlet of the primary-stage paddle dryer through a pipe, the discharge hole of the primary-stage paddle dryer is connected with the feed inlet of a secondary-stage paddle dryer, and the discharge hole of the secondary-stage paddle dryer is connected with the inlet of a sludge incineration boiler; the air outlet of the primary-stage paddle dryer is sequentially connected with a washer, a draught fan A and the sludge incineration boiler through pipes; the air outlet of the secondary-stage paddle dryer is connected with a dust collector cyclone which is connected with the air inlet of the secondary-stage paddle dryer and the air inlet of the primary-stage paddle dryer through a draught fan B respectively; and the vapor outlet of the sludge incineration boiler is connected with the air inlet of the secondary-stage paddle dryer and the tail gas outlet of the sludge incineration boiler is sequentially connected with a tail gas washer, a bag-type dust remover, a draught fan C and a chimney through pipes. The invention also discloses a sludge drying process using the system at the same time.

Description

technical field [0001] The invention relates to a sludge drying system and a drying process thereof, in particular to a sludge superheated steam drying system of a double-stage paddle dryer and a drying process thereof. Background technique [0002] At present, comprehensively analyzing the difficulties in the practical application of the sludge treatment and disposal technology system, it is not difficult to see that the moisture content of the sludge is the key influencing factor. The domestic and foreign applications show that the moisture content of the sludge cannot reach below 70% after being treated by the traditional concentration and dehydration process. Therefore, to achieve the deep dehydration of sludge, the more economical method is to apply the thermal drying technology commonly used in chemical operations. The principle of thermal drying technology is to use steam for indirect heat exchange dehydration or use heated hot air to directly dry sludge. dehydration...

AI Technical Summary

Problems solved by technology

[0004] Due to the indirect heat exchange of steam, the equipment needs to have a large heat exchange area, and the thermal efficiency of indirect heat exchange is relatively low, resulting in large energy consumption;

[0005] Because the heated hot air is used to dry and dehydrate the sludge, so that the moisture in the sludge reaches the vaporization point for dehydration, which requires a large amount of hot air, resulting in poor operating environment, more thermal efficiency loss, and low efficiency.

[0006] The selection of equipment for these processes is relatively large, resulting in increased equipment investment, increased operating costs, and increased maintenance.

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