Circular overground coal-water sedimentation tank capable of automatically discharging coal slime and coal slime discharging method

Abstract

The invention relates to a circular overground coal-water sedimentation tank for automatically discharging coal slime and a coal slime discharging method, belonging to the field of supporting facilities of thermal power plants. In the invention, the slime bin is installed at the bottom of the sedimentation tank body, the scraper is located in the sedimentation tank body, the slime conveyor is communicated with the slime bin, one end of the stirring shaft is connected with a motor, the other end of the stirring shaft is connected with a stirring paddle, the stirring paddle is located in the slime bin, the stirring paddle is located above the slime conveyor, the coal water inlet and the coal water outlet are both installed at the upper part of the sedimentation tank body, and the coal waterinlet and the coal water outlet are respectively located at two sides of the sedimentation tank body. The invention realizes that the coal water sedimentation tank has no dead corners for sedimentation, the slime is automatically discharged by gravity, the sludge discharging process and the coal water separation, the sludge discharging water content is low, the supernatant water quality is stable,the flow fluctuation of the coal water is adapted, and the like, thereby creating better water inlet conditions for subsequent coal-containing wastewater treatment devices and reducing the failure rate of the coal-containing wastewater treatment system.

Description

technical field [0001] The invention relates to a circular above-ground coal-water sedimentation tank for automatically discharging coal slime and a method for discharging coal slime, belonging to the field of supporting facilities of thermal power plants. Background technique [0002] Conventional coal-containing wastewater treatment process is as follows: [0003] Coal-containing wastewater→first-level coal-water collection pool (around the coal yard)→coal-water delivery pump→coal-containing wastewater sedimentation tank→intermediate water pump (supernatant)→coal-containing wastewater treatment device→processed qualified wastewater reused to the coal yard ( Such as figure 1 shown). [0004] The coal-water sedimentation tank has a large volume and a long residence time, so the coal slime is deposited in the sedimentation tank, and the supernatant is boosted and transported to the coal-containing wastewater treatment device for further treatment, and can be reused after pa...

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Problems solved by technology

[0006] 1) Generally rectangular and underground pools, there are dead corners for slime deposits, and regular manual cleaning is required because the grab track is fixed;

[0007] 2) The volume of the pool is large, and the coal water inlet has not been distributed, resulting in uneven deposition of coal slime. The coal slime with large particle size is easier to deposit near the pool wall at the water inlet, and the grab bucket cannot be cleaned;

[0008] 3) The water quality of the supernatant is unstable, and when the inflow flow is small, the water quality of the supernatant is slightly better

When the influent flow rate is large, the water quality of the supernatant is poor, and the subsequent coal-containing wastewater treatment device has high operating pressure and high failure rate;

[0009] 4) The flow rate of the supernatant is unstable. If the subsequent dosing is required, the dosage adjustment will be very frequent, resulting in a high failure rate of the dosing system;

[0011] 6) Untimely manual cleaning will cause the entire coal-water sedimentation tank to lose its sedimentation function, resulting in frequent outages of the coal-containing wastewater treatment system;

[0012] In view of this, in the patent document with the application number 201310597414.2, the coal-water collection system on the ground of the hardened coal unloading square of the coal-fired power plant is disclosed. The above-mentioned comparative documents have disadvantages such as high investment and high labor costs.

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