Feeding system for fly ash washing

Abstract

The invention relates to a feeding system for fly ash washing. The feeding system comprises a fly ash storage unit, a fly ash conveying unit, a compressed air unit, a pressure release unit and a backflow unit, wherein the fly ash conveying unit is connected with the fly ash storage unit; the compressed air unit is connected with the fly ash storage unit and the fly ash conveying unit; the pressurerelease unit is connected with the fly ash conveying unit; and the backflow unit is connected with the pressure release unit. The feeding system has the advantages that the compressed air unit, the pressure release unit and the backflow unit are introduced, so that the feeding system can continuously work for one month without manual cleaning or intervention, the actual conveying amount is almostconsistent with the designed conveying amount, and the stable work of the whole fly ash washing system and the accuracy of material balance are guaranteed; and in the process, the equipment integration degree is high, the automation degree is high, and set parameters can be modified through different working conditions to achieve the most stable operation state.

Description

technical field [0001] The invention relates to the technical field of feeding systems, in particular to a feeding system for fly ash washing. Background technique [0002] Waste incineration fly ash is the catch of the flue gas purification system and the bottom ash settled at the bottom of the flue and chimney during the municipal solid waste incineration and disposal process. Waste incineration fly ash contains heavy metals, benzene series, dioxins and other pollutants, which are listed as hazardous waste (HW18) in my country. [0003] Cement kiln co-processing waste incineration fly ash is to add the pretreated fly ash as raw material to the cement production process, which replaces some cement raw materials and effectively removes organic pollutants such as dioxins enriched in the fly ash , realizing resource disposal of fly ash. Since fly ash contains a large amount of Cl - and heavy metal elements, in order to avoid impact on the cement production process, it must ...

AI Technical Summary

Problems solved by technology

[0004] The transportation of waste incineration fly ash from the fly ash storage bin to the premix tank is the first step in the whole fly ash washing process. However, due to the characteristics of high viscosity, easy to be affected by moisture, and easy hardening, the traditional fly ash transportation system is often used. The fly ash will be hardened by moisture, which will lead to the blockage of the conveying device. The present invention is a fly ash feeding system for the fly ash washing process. By combining traditional mechanical conveying and pneumatic conveying, the fly ash feeding system can realize Purpose of continuous normal operation

[0005] For example, the patent CN205443075U provides a fly ash washing and feeding mixing system. This invention is used in the fly ash washing process. It describes a feeding method based on electric hoist lifting and screw conveying, but the invention is basically different from traditional machinery. There is almost no difference in the transportation, and the situation that the fly ash clogs the screw conveying device still occurs; the patent CN203833018U proposes an anti-blocking soot blowing device for the ash storage device. This invention is mainly used for the fly ash in the ash storage device. In the case of raw materials, a soot blowing device is added at the position of the ash hopper of the ash storage device, but the blowing air used in this invention has not undergone processes such as water removal and heating, so it is more likely to cause the fly ash in the ash storage device to be dampened and hardened; patent CN109368901A Disclosed is a waste incineration fly ash water washing treatment system and method. The invention describes a waste incineration fly ash water washing treatment system and method, including fly ash water washing pretreatment, wastewater treatment after washing, wastewater evaporation and salt separation treatment, etc. However, the fly ash feeding process is not elaborated

[0006] Taking the above-mentioned patent as an example, the problems in the scheme mainly include: ① Since the ash storage device has no supporting equipment, the fly ash will be damp and hardened in the ash storage device; ② Since the conveying equipment has no relevant anti-blocking equipment, the fly ash will Blockage or agglomeration; ③ Due to the lack of relevant anti-blocking measures, the discharge port of the conveying equipment will contact the water vapor of the premix tank, which will cause blockage of the discharge port; ④ Due to the lack of relevant measures, the vacuum release valve of the premix device will be flying Ash clogging; ⑤ Due to the lack of relevant exhaust measures, the pressure in the premixing device increases, which affects the normal operation of subsequent washing equipment

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