CN104370428A

CN104370428A - Low energy consumption drying method for producing brick from sludge

Info

Publication number: CN104370428A
Application number: CN201310354611.1A
Authority: CN
Inventors: 蒋华
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-08-15
Filing date: 2013-08-15
Publication date: 2015-02-25

Abstract

The invention relates to a low energy consumption drying method for producing brick from sludge. The technical scheme for solving the technical problem in the present invention comprises: drying additives required by brick production, and adding mechanically-dewatered sludge so as to achieve drying of the sludge, wherein the additives comprise clay and fly ash.

Description

A kind of making brick from sludge less energy-consumption drying means

Technical field

The present invention relates to drying method for sludge, especially relate to a kind of less energy-consumption drying means of making brick from sludge.

Background technology

The process of municipal effluent in the whole nation each town and country build up and put into operation; this serves active effect to preventing the water pollution problems of China; but the mud formed in sewage treatment process brings environmental pollution again; therefore, in protection of the environment, the problem that is needed badly solution is become again to the process of municipal sludge.The method of disposal of current mud mainly contains Land_use change, landfill, burning, biochemical treatment and topples over throws sea etc.But the moisture percentage in sewage sludge produced in sewage treatment process is high, volume is large, brings great inconvenience to its transport, ultimate disposal and utilization, therefore must utilize sludge dewatering, dry means, moisture is separated from mud.The calorific value of mud is very low, if adopt the means process of burning also to need very large energy expenditure.So will reach the deep dehydration of mud, comparatively economic method is exactly heated drying technology and equipment conventional in application chemical industry operation.But the characteristic of mud determines to dewater difficulty in drying sludge process greatly, and energy consumption is high.

Brickmaking is the comprehensive utilization of mud, the important channel of resource utilization.The operation of making brick from sludge is first by the mechanical sludge dewatering of water ratio 90 ~ 97%, makes moisture percentage in sewage sludge drop to 70 ~ 80%, then dry at stoving oven, and last mixing with clay bakes bricks.In whole sludge brick process processed, how reducing dehydration cost is the previous study hotspot of order, is also an important factor of restriction making brick from sludge technology popularization.But the existence form of the various water moleculess of mud inside and the zoogloea characteristic of mud determine water molecules mass-and heat-transfer difficulty in drying sludge process, directly translate into dehydration difficult, dry required energy consumption is high.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of making brick from sludge less energy-consumption drying means, the pollution problem of mud after solution sewage disposal, and makes brickmaking dewatering rate used high.

For solving the problems of the technologies described above, the technical solution used in the present invention is: by brickmaking desired additives clay and flyash drying, then add the mud after mechanical dehydration, realize the drying of mud.

The present invention is realized by following steps:

A. get moisture 90 ~ 97% mud, mud is injected plate-and-frame filter press, when reaching mud amount, under the pressure of about 1.6 ~ 2.0MPa after pressurize 40 ~ 45min, so that the moisture in mud is taken off;

B. after pressurize completes, release blowing, the water ratio of mud reaches 60 ~ 70%;

C. its water ratio is made to drop to 5 ~ 8% in flyash and clay dehydration;

D. the wet mud 2 after dehydration mixes in steel basin with flyash 1 and clay 1.

Wherein, in steps A, the mud of moisture 90 ~ 97% injects plate-and-frame filter press to accelerate injection speed by ram pump, and entering mud pressure is 0.6 ~ 0.9MPa.In step C, the dehydration of flyash and clay adopts common vertical air blast dryer blowing to realize.Wet mud in step D after dehydration mixes under high-speed stirring effect with flyash and clay.

The present invention utilizes the characteristic of brickmaking desired additives clay and the easy drying and dehydrating of flyash, first dry additive again with mechanical dehydration after mud mix, under high-speed stirring effect, mix thing be fine particle and mix.In fine grain wet mud, water molecules is inner short to the flow process of outside from mud, mass transfer is fast; And the water-absorbent of thin dry powder is strong, make mud reach deep dehydration drying by the water suction of dry powder, the mixture obtained can directly as the blank of brick.

Embodiment

Embodiment 1: get moisture 97% municipal sludge, by ram pump, quenched and tempered mud is injected plate-and-frame filter press, entering mud pressure is 0.6MPa, when reaching mud amount, under the pressure of about 1.8MPa after pressurize 40min, to be taken off by the moisture in mud; After pressurize completes, release blowing, the water ratio of mud reaches 70%; Adopt common vertical air blast dryer, make flyash and sticky soil's water content drop to 5%; Wet mud 2 after dehydration mixes in steel basin with flyash 1 and clay 1, and the brickmaking blank water ratio finally obtained is 30.7%.

Embodiment 2: get moisture 95% municipal sludge, by ram pump, quenched and tempered mud is injected plate-and-frame filter press, entering mud pressure is 0.9MPa, when reaching mud amount, under the pressure of 2.0MPa after pressurize 45min, to be taken off by the moisture in mud; After pressurize completes, release blowing, the water ratio of mud reaches 70%; Adopt common vertical air blast dryer, make flyash and sticky soil's water content drop to 6%; Wet mud 2 after dehydration mixes in steel basin with flyash 1 and clay 1, and the brickmaking blank water ratio finally obtained is 36.5%.

Present invention utilizes making brick from sludge additive clay, flyash dehydration is easy to performance, by first to the method that additive drying mixes with wet mud again, achieve the less energy-consumption deep dehydration drying of mud.

Claims

1. the less energy-consumption drying means of a making brick from sludge, it is characterized in that, it adopts the following step to realize: A. gets the municipal sludge of moisture 90 ~ 97%, mud is injected plate-and-frame filter press, when reaching mud amount, under the pressure of 1.6 ~ 2.0MPa after pressurize 40 ~ 45min, so that the moisture in mud is taken off, B. after pressurize completes, release blowing, the water ratio of mud reach 60 ~ 70%, C. make its water ratio drop to the dehydration of 5 ~ 8%, D. above-mentioned step B in flyash and clay dehydration after wet mud 2 mix in steel basin with flyash 1 and clay 1.

2. the less energy-consumption drying means of making brick from sludge as claimed in claim 1, it is characterized in that, in steps A, the municipal sludge of moisture 90 ~ 97% injects plate-and-frame filter press by ram pump, and entering mud pressure is 0.6 ~ 0.9MPa.

3. the less energy-consumption drying means of making brick from sludge as claimed in claim 1 or 2, is characterized in that, the wet mud in step D after dehydration and flyash and clay Homogeneous phase mixing under high-speed stirring effect.