Flash evaporation mechanical filter pressing coupling vacuum sludge drying system and method

Abstract

The invention provides a flash evaporation mechanical filter pressing coupling vacuum sludge drying system and method. The system comprises a stock bin, a dosing system, a mixing system, a plate-and-frame filter pressing system, a water source heat pump system, a vacuum system, an air compression system, a sludge conveying system and a sewage recovery system. According to the sludge drying method provided by the invention, a vacuum flash evaporation mode is utilized, the limitation of a traditional 100 DEG C high-temperature wall breaking technology is broken, the energy consumption is reduced, the service life of equipment is prolonged, and the process cost is reduced; the flow of water vapor outside a filter cake is accelerated through trace air inflow, the drying efficiency is improved, meanwhile, deep dehydration of the sludge is completed through vacuum flash evaporation, and the water content in the sludge is remarkably reduced and is reduced to be 40% or below. A traditional filter frame is improved, the underflow pipes are arranged at the four corners of the plate body, and the upper-end underflow pipe and the lower-end underflow pipe are connected through the pipelines respectively, so that water vapor can be conducted more uniformly, the water evaporation rate is increased, and the sludge drying time and energy consumption are saved.

Description

technical field [0001] The invention belongs to the technical field of sludge drying, and in particular relates to a flash mechanical pressure filter coupled vacuum sludge drying system and method. Background technique [0002] Sludge drying, also known as sludge dehydration, refers to the process of removing a large amount of water from sludge by means of osmosis and evaporation, reducing the moisture content of sludge, and facilitating the transportation, accumulation, utilization or further recovery of water resources of sludge. . Municipal sludge is different from other sludges. The water in municipal sludge is mainly divided into free water, capillary water, adsorbed water and internal water. By mechanically squeezing the sludge, only free water and part of capillary water can be eliminated, but capillary water Only a small part is removed, and the adsorbed water and internal water cannot be removed basically. The traditional sludge drying technology can only squeeze ...

AI Technical Summary

Problems solved by technology

[0003] The existing cell wall breaking technology usually adopts the method of high-temperature steaming. The filter frame is heated by 100°C high-temperature steam to heat and break the wall of the chamber sludge, with a rubber plate in between, not only the heating time is long and slow, but also The long-term 100°C high temperature environment has relatively high requirements on the filter frame, high cost, and consumes a lot of heat resources

[0004] Patent No. "CN201910123542.0" titled "A Sludge Treatment Process for Ultra-high Temperature Biological Drying Coupled with Fluidized Bed Incineration" discloses a method for ultra-high temperature biological drying of sludge. This method is not only time-consuming and expensive There are many resources, low energy efficiency ratio, and the moisture content of the sludge is still about 50%, the effect is not ideal

[0005] Patent No. "CN110183073A" titled "A Method for Vacuum Dehydration Treatment of Sewage Plant Sludge to Realize Efficient Wall Breaking" uses the method of freezing to make the sludge cells expand and break the wall and crush under pressure to achieve further dehydration of the sludge , but this method is cumbersome and complicated

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