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Pulse flashing deep dehydration method and device for sludge

A deep dewatering and sludge technology, applied in the direction of dewatering/drying/concentrating sludge treatment, etc., can solve the problems of high energy consumption and high operating costs, and achieve the effect of reducing energy consumption and improving dewatering performance

Inactive Publication Date: 2010-09-01
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sludge drying requires a lot of energy. If steam drying is used, one ton of sludge needs to consume 0.8-1 ton of steam, and the operating cost is extremely high.

Method used

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  • Pulse flashing deep dehydration method and device for sludge
  • Pulse flashing deep dehydration method and device for sludge

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Embodiment 1

[0024] A sludge pulse flash deep dehydration method, the steps are as follows:

[0025] Step 1: Prepare the wet sludge into slurry with a water content of 85% to 90%, and send the slurry to a high-temperature flash steam preheater for heating through a high-pressure pump. In this embodiment, it is best to heat the slurry to above 100°C.

[0026] Step 2 takes a conditioning kettle, and sets a pulse valve at the outlet of the conditioning kettle,

[0027] Step 3 Keep the pulse valve in the closed state. At the same time, the high-pressure pump sends the mud heated by the flash steam high-temperature preheater into the tempering tank and heats it to 130 ° C ~ 160 ° C. When the pressure in the conditioning tank reaches 1.2 MPa ~ 2.5MPa, then open the pulse valve, the mud in the tempering tank will expand rapidly, and part of the mud will enter the flash tank to produce a flash steam explosion effect, destroy the sludge structure, and generate flash steam; after that, close the pul...

Embodiment 2

[0032] A device for implementing the above sludge pulse flash deep dehydration method, comprising a preparation kettle 1, a high-pressure pump 2, a flash steam high-temperature preheater 7, a conditioning kettle 6, a pulse valve 5, a flash kettle 4, a cooling kettle 8, Separator 9, outlet 1 of preparation kettle is connected with inlet of high pressure pump 2, outlet of high pressure pump 2 is connected with inlet of cold end of flash steam high temperature preheater 7, outlet of cold end of flash steam high temperature preheater 7 is inlet of conditioning kettle 6 The outlet of the conditioning tank 6 is connected to the inlet of the flash tank 4 through the pulse valve 5, the upper port of the flash tank 4 is connected to the hot end inlet of the flash steam high-temperature preheater 7, and the lower port of the flash tank 4 is connected to the mud low-temperature The hot end inlet of the preheater 3 is connected, the hot end outlet of the mud low temperature preheater 3 and...

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Abstract

The invention discloses a pulse flashing deep dehydration method for sludge, which comprises the following steps: preparing wet sludge into slurry containing 85%-90% of water; delivering the slurry into a flashing steam high-temperature preheater for heating; when a pulse valve arranged at the outlet of a refining kettle is closed, elevating the temperature and pressure in the refining kettle to certain values by utilizing a high pressure pump; then opening the pulse valve so that the slurry in the refining kettle rapidly expands, part slurry enters a flashing kettle and generates a flashing steam explosion effect, thus damaging the sludge structure and generating flashing steam; then, closing the pulse valve again; cycling continuously to generate the structure damaged sludge and flashing steam; introducing the flashing steam into the flashing steam high-temperature preheater for heating the slurry; and after the sludge enters a cooling kettle and is cooled, carrying out sludge water separation by utilizing a separator to obtain a sludge cake containing less than 35% of water. The device disclosed by the invention comprises a preparing kettle (1), the high pressure pump (2), the flashing steam high-temperature preheater (7), the refining kettle (6), the pulse valve (5), the flashing kettle (4), the cooling kettle (8) and the separator (9). The invention has low energy consumption and continuous operation, and the sludge treated at high temperature truly meets the requirements of stabilization, harmlessness and reduction.

Description

technical field [0001] The invention relates to a method and device for deep sludge dehydration, in particular to a method and device for improving sludge dewatering performance by adopting pulse flash technology to continuously produce flash and steam explosion effects in sludge. technical background [0002] With the rapid development of the global economy and people's increasing concern for the environment, the amount of sewage treatment has increased rapidly, leading to the rapid expansion of sludge production. At present, my country's annual discharge of dry sludge is about 5 million tons, and it is increasing. Improper sludge treatment will cause serious secondary pollution, and the investment and operation costs of sludge treatment are huge, accounting for 25% to 65% of the investment and operation costs of the entire sewage plant, which has become a heavy burden for urban sewage treatment plants. Therefore, how to dispose of excess sludge economically and efficientl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12
Inventor 葛仕福赵培涛
Owner SOUTHEAST UNIV