Sludge stirring system

Abstract

The invention discloses a sludge stirring system, comprising a stirring tank, a sludge output, a driving device, a stirring shaft arranged on the same shaft with the driving device, a stirring blade and a baffle. Every group of baffle is regularly arranged above the stirring blade of the corresponding group and has the same height with the inner side of the stirring tank. The vertical distance between the baffle and the corresponding stirring blade is more than 0.3 meter or equal to 0.3 meter. The installation direction of the baffle is opposite to the rotating direction of the stirring blade. An angle of 30 DEG to 60 DEG is kept between the baffle and the ground. The radical width of the baffle is 15 percent to 15 percent of the diameter of the stirring tank. The radical width of the baffle is more than or equal to 0.1 meter while the length of the baffle is more than or equal to 0.15 meter. The sludge stirring system has the advantages that the sludge particles are coarse, and solid-liquid separation is obvious, and insoluble additive covered in the sludge cannot be seen when opening the sludge cake, and additives not taking part in the action cannot be seen in the stirring tank. The water content of the sludge cake after dehydration is less than 60 percent.

Description

technical field [0001] The invention relates to a sludge stirring system for uniformly stirring sludge. Background technique [0002] The existing sludge mixing system, such as the utility model patent No. 200720069024.8, discloses a sludge and garbage mixing solidification system, including a mixing tank, a material inlet, a material outlet, and a number of stirring shafts in the mixing tank , a number of stirring arms are fixed on the stirring shaft, at least one stirring blade is installed at the front end of each stirring arm, and the same number of side blades as the number of stirring blades is installed at the rear end of each stirring arm. [0003] This kind of sludge and garbage mixed solidification system, that is, the sludge mixing system, has the following disadvantages due to the lack of baffles: the liquid is not stirred uniformly; at the same speed, when the mixing tank is not equipped with baffles, add The amount of additives is large, and the mixing time is...

AI Technical Summary

Problems solved by technology

[0003] This kind of sludge and garbage mixed solidification system, that is, the sludge mixing system, has the following disadvantages due to the lack of baffles: the liquid is not stirred uniformly; at the same speed, when the mixing tank is not equipped with baffles, add The amount of additives is large, and the stirring time is long. When you break the mud cake, you can see that some additives are mixed with the mud cake, and some additives remain in the mixing tank and do not participate in the reaction; the above shortcomings lead to poor dehydration effect and high production costs.

The reason is that during the stirring process, due to the linear velocity of the sewage sludge, the liquid surface forms two rotating circles, one outer circle and one inner circle; during the stirring process of sewage sludge, the outer circle is always much faster than the inner circle. The wall thickness of the outer ring formed by the surface is much smaller than that of the inner ring, and the inner ring is several times the thickness of the outer ring, generally about 4 times; and the liquid surface of the outer ring forms a tumbling wave, and the liquid surface of the inner ring is stirring There will be no tumbling phenomenon, but advection and slow flow, so it is impossible to disperse the additives in the inner ring and mix them evenly with the sewage sludge in a short time

Due to the high viscosity of sewage sludge, once the additives cannot be dispersed in a short time and react with the sewage sludge, they will be wrapped by the sewage sludge, so that the added additives cannot play the role of conditioning

[0004] Without baffles, due to the high viscosity of the sewage sludge, the additives cannot be dispersed in a short time and react with the sewage sludge, and will be wrapped by the sewage sludge, resulting in that the added additives cannot play a conditioning role , affecting the dehydration effect, the moisture content of the mud cake after dehydration is about 5% higher than that of the baffle plate

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