Vertical inter-partition sludge drying method and equipment with crushing and safety monitoring functions

Abstract

The invention discloses a vertical inter-partition sludge drying method and equipment with crushing and safety monitoring functions. The method comprises the following steps: dividing a sludge drying process into a dried material back-mixing stage, a first drying stage, a crushing treatment stage, a second drying stage and a final screening and discharging stage, wherein the sludge drying operation is performed under monitoring of a safety monitoring system. The equipment comprises a heating box provided with multiple energy interfaces, a rolling plodder, a drying box (a crusher, a metallic screen and a conveyer belt are arranged in the drying box, and the interior of the drying box is partitioned into two intervals by a thermal insulation material and the crusher position in the middle), an exhaust fan, a dust remover, a deodorization device, a water vapor reflux pipe and is also equipped with a safety control center system. According to the sludge drying equipment, the drying method can be effectively performed. The problems of cost, adhesion and safety during sludge drying are appropriately solved, the drying efficiency is high, the discharging uniformity is high, and the sludge resource recycling value is high.

Description

technical field [0001] The invention relates to a sludge drying method and its equipment which are divided into vertical compartments and have crushing and safety monitoring functions. Background technique [0002] With the large-scale construction of modern sewage treatment plants, sludge production has increased rapidly. These sludges have a high water content (generally 98%), and the water content after dehydration is still greater than 80%, which is not easy to handle. If not properly treated and disposed of, it will cause secondary pollution to the surrounding environment of the dumping area. Rational treatment of sludge is an inevitable requirement to maintain the beautiful environment around us and protect our health. Anaerobic digestion, high-temperature composting, incineration and landfill are the most commonly used methods for sludge treatment and disposal, but the direct use of sludge with high moisture content in composting and landfill will easily cause new en...

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Problems solved by technology

[0003] The traditional process of reducing the moisture content of sludge is to use drying equipment to dry sludge at a high temperature of 200°C to 700°C, which requires the consumption of primary energy such as coal, oil, and natural gas; in the actual sludge drying process , there are many problems such as serious energy waste and high operating costs

Moreover, during the sludge drying process, as the moisture content of the sludge decreases, when the moisture content decreases to about 60%, the sludge will be in the cementation stage, and it is easy to agglomerate, forming a hard surface, difficult to crush but internal It is still a particle of thin mud, and the water is not easy to remove; at the same time, the sludge in the cementation stage is easy to stick together with the equipment, which reduces the drying efficiency and shortens the life of the equipment; the sticking problem is a problem that has to be considered in the sludge drying process

Since sludge is the residue of pollution control, there are more chances of being mixed with various dangerous substances, such as: hydrocarbons (flammable gases, such as methane are anaerobic products of sludge itself), fibers (dangerous dust), metal foreign matter, Stones, iron powder (all of which may cause sparks), solvents (all of which may spontaneously ignite when exposed to oxygen), etc., during the drying process, the spontaneous combustion of dried sludge and equipment explosion will cause serious damage to the drying equipment and the environment; sludge drying The system is prone to explosion when it is started and shut down, and other accidental factors in the drying process will also cause danger. Safety issues in the sludge drying process must be paid attention to

[0004] In view of the serious waste of energy, high processing cost, low drying efficiency, easy to cause sticking problems, unstable equipment operation, and potential safety hazards in the sludge drying process, we are looking for safe, economical and efficient sludge drying. The method and drying equipment are imminent

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