Industrial production method and system of sludge steam-pressing brick

Abstract

The invention discloses an industrial production method and system of a sludge steam-pressing brick. The method comprises the following steps: raw material preparation, first mixing of raw materials,digestion, second mixing of raw materials, wheel grinding, compression forming, static placing maintenance and steam-pressure maintenance; the system comprises a first mixing and stirring device, a sludge deep dehydration device, a raw material coarse crushing device, a sludge powdering device, a raw material intermediate crushing device, a raw material fine crushing device, a second mixing and stirring device, a digestion device, a third mixing and stirring device, a wheel grinding device, a compression forming device, a static-placing maintenance device and a steam-pressure maintenance device. The method and system disclosed by the invention are high in sludge dehydration efficiency and low in energy consumption, low in cost, and less in land area; multiple solid wastes can be utilized,the sludge doping amount is high, and the method and system are environmentally-friendly, and the production of bad smell and harmful gas in the production process is avoided.

Description

technical field [0001] The invention relates to an industrial production method and system for sludge autoclaved bricks, belonging to the technical field of sludge resource utilization. Background technique [0002] Sludge refers to solid, semi-liquid and liquid waste produced by sewage treatment plants, generally with a water content of about 80%, containing a large amount of organic matter and a certain amount of heavy metals, viruses, pathogens, parasite eggs and other harmful substances. How to reasonably solve the world problem of sludge treatment and disposal, and achieve the treatment goals of reduction, stabilization, harmlessness, and resource utilization has become an urgent problem for the society. [0003] At present, my country's sludge treatment and disposal mainly has the following process directions, each with its own advantages and disadvantages: First, dry incineration, the process reduces and stabilizes significantly, but the investment is large, the opera...

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Problems solved by technology

[0003] At present, my country's sludge treatment and disposal mainly has the following process directions, each with its own advantages and disadvantages: First, dry incineration, the process reduces and stabilizes significantly, but the investment is large, the operating cost is high, and in the flue gas treatment Dioxin will be generated under non-standard conditions; the second is aerobic composting, which is widely used, but has the problem of excessive heavy metals. The problem is that it is difficult to select a site; the third is anaerobic digestion, which is widely used abroad, but due to the low organic matter content of domestic sludge and low operating efficiency, many projects are in a state of shutdown after construction; the fourth is deep dehydration and filling Buried, this process has small investment and low operating cost. It has been widely used in recent years, but it has the problem of secondary pollution, and it only reflects the reduction and stabilization of sludge treatment, but does not achieve harmlessness and resource conservation. change

[0004] In view of the shortcomings and problems of the above-mentioned disposal methods and the urgent need for sludge treatment, the methods of using sludge to prepare building materials have emerged in an endless stream in recent years, especially the production method of sludge bricks. In recent years, many related patent authorizations and However, after careful study, it will be found that many methods remain in the laboratory stage. Once applied to actual industrial production, it will be found that: First, due to the gel properties of sludge, it is only a large amount of sludge with a water content of 80wt%. It is very difficult to mix the mud or the sludge cake with a water content of 30-60wt% after deep dehydration or heat drying with other raw materials evenly, and the sludge will often form agglomerates, resulting in the "weak point" in the strength of the brick embryo. Brick sludge with low content, unstable quality, poor strength, unwillingness to use bricks, and poor sales; the second is the dehydration link of sludge. If the deep dehydration process is used, it can only be dehydrated to a moisture content of 40-60wt%. , if the thermal drying process is used, the energy consumption will be high, and a large amount of odor will be generated during the operation

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