Sludge hollow blade dryer and control method thereof
A hollow paddle and drying machine technology, applied in chemical instruments and methods, water treatment parameter control, water/sludge/sewage treatment, etc., can solve problems such as low reliability, uneven fluid velocity, lack of
Inactive Publication Date: 2016-12-07
GREEN WATER SEPARATION EQUIP
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Problems solved by technology
[0008] However, the flow of sludge slurry in the cavity of the dryer is a very complicated process, and the fluid velocity is not uniform in all parts of the cavity. The flow velocity at several points measured by the flow velocity sensor is used as the basis for the speed control of the dryer. Its reliability is not high
Moreover, under the multiple effects of force and heating, the fluid properties of the sludge slurry itself show a phase change. Since the change of the sludge slurry's own state is closely related to its fluidity and dehydration, it cannot be controlled only by the measured flow rate. However, there are difficulties in the measurement and characterization of the state of the sludge slurry itself, which makes the prior art lack of technical solutions for controlling the rotation of the paddles based on the state of the sludge slurry
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[0040] The technical solutions of the present invention will be further specifically described below through examples.
[0041] After the preliminary dehydrated sludge material is put into the cavity of the hollow paddle dryer, under the action of the shear force generated by the hollow paddle agitation, it is quickly transformed into a viscous sludge slurry in the cavity; the sludge slurry is dried in the hollow Under the impetus provided by the paddles, it flows forward and undergoes the process of dehydration by heat; under the continuous action of shear force, the viscosity of the sludge slurry will decrease and show non-plastic characteristics in the initial stage of operation in the cavity. This stage is called the fluid stage; with the removal of water caused by heating, in the next stage, the sludge slurry will become viscous and plasticity strengthened, and this stage is called the viscous stage; As the water content further decreases, the adhesion of the sludge slurr...
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Abstract
The invention provides a sludge hollow blade dryer and a control method thereof. The sludge hollow blade dryer has the intellectualized working control capacity. On the basis of the sludge multiphase fluid motion model, related parameter detection can be performed to accurately monitor the sludge fluid state in the dryer cavity in real time; and the blade rotation speed, heat-conducting medium temperature and other parameters are controlled, so that the sludge heating dewatering time in the dryer is moderate, and the water content of the discharged material of the dryer is stably kept on a proper level.
Description
technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a sludge hollow paddle dryer and a control method thereof. Background technique [0002] Sludge is an important pollution output formed in industrial and agricultural production and urban life. will produce sludge. Sludge contains a large number of harmful microorganisms, heavy metals and organic pollutants. If not properly disposed of, it will have a serious negative impact on the natural environment and people's health. [0003] Sludge incineration is to make the combustible substances in sludge burn at high temperature and make them oxidatively decompose, so as to achieve the purpose of reducing sludge capacity, killing harmful microorganisms, removing toxicity and making full use of energy. Sludge incineration is a widely used and mature sludge high-temperature treatment technology in foreign countries. It can minimize the volume of sludge, and has the advantages o...
Claims
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IPC IPC(8): C02F11/12
CPCC02F11/12C02F2201/002C02F2209/02C02F2209/03C02F2209/40
Inventor 刘富稳
Owner GREEN WATER SEPARATION EQUIP