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Waste Incineration 3 Phase Decanter Centrifuge Fly Ash Treatment Blue Or Green

Categories 3 Phase Decanter Centrifuge
Brand Name: WP
Model Number: LW
Place of Origin: CHENGDU,CHINA
MOQ: 1UNIT
Price: Negotiable
Payment Terms: L/C, T/T
Supply Ability: 30UNITS/MONTH
Delivery Time: 1-3MONTH
Packaging Details: IRON SUPPORT FRAME
Materials: SS304,316,2205
Frequency: 50/60Hz
Voltage: 380/460V/600V
Color: blue or green
Application: Solid fluid separation
Centrifuge Usage: Dewatering of waste incineration fly ash after washing
Operation: PLC Fully automatic control mode
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Waste Incineration 3 Phase Decanter Centrifuge Fly Ash Treatment Blue Or Green


PLC Control Waste Incineration Fly Ash Treatment 3 Phase Decanter Centrifuge


Waste Incineration Fly Ash Resource Utilization


I. Introduction to waste incineration fly ash

Fly ash is a powder material with light weight and fine particle size collected by the flue gas purification system in a waste incineration power plant. The ash contains not only a large amount of heavy-metal inorganic harmful substances such as Cd, Cr, Cu, Ni, Pb and Zn, but also soluble substances (salt) like potassium, sodium, and m ions, and it is enriched with highly toxic dioxins and other organic carcinogens of high concentration. Fly ash is a nationally designated hazardous waste (code HW18).


II. Utilization of waste incineration fly ash resources

At present, fly ash is mainly solidified landfill, and the disposal rate of fly ash is fairly low. Meanwhile, landfill disposal will leave behind a huge ecological safety hazard. The main difficulty in chelation of heavy metals in fly ash using chemical agents is that there is no obvious stabilizing effect on dioxins and dissolved salts, and the long-term stability of fly ash after chemical treatment in the environment is uncertain, especially prominent in acidic environment. Although the current policy allows fly ash to be solidified and landfilled, it is still difficult to determine whether the expensive chelating agent can be effective and stabilized for a long time. As time goes by, the quality of some landfill sites changes, and the leakage of the landfill site has become a malignant tumor and a time bomb to the environment. In the meantime, in the densely populated central and eastern regions of developed economy and scarce land resources, the land resources that can be used as landfill are extremely limited, and fly ash is confronted with the severe pressure of landfill depletion.


On November 6, 2012, the first domestic cement kiln co-processing waste incineration fly ash demonstration line was completed and operated in Beijing Jinyu Water Protection Technology Co., Ltd, which, after the upgrading and transformation in October 2014 and the operation of the second production line in January 2018, has become an environmentally-friendly company that handles 70,000 tons of fly ash yearly, has carried out the task of disposing fly ash in Beijing, and has been listed as a “city guarantee enterprise”. With a series of treatment processes, the "zero emission" standard has been met.


Currently, a number of enterprises in Zhejiang Province are embarking on the utilization project of waste incineration fly ash resources. The disposed fly ash is used as a substitute material for cement enterprises and also a substitute for cement bricks in urban infrastructure; the ultimate goal is to solve fly ash pollution and establish a guarantee enterprise for urban environmental safety. In the meantime, cement production enterprises are upgraded from "resource-consumption" industrial producers to "fly ash terminator" of urban pollution.



III. Utilization of waste incineration fly ash resources

To realize the resource utilization of waste incineration fly ash, the key technology is how to dechlorinate and decompose dioxin and make the heavy metal in the fly ash in a solidified state.


★ Salt removal as key process

△ Waste incineration fly ash features high chlorine, sulfur, alkali, potassium, and sodium, which are easy to cause cement kiln crust and blockage without treatment;


△ Dechlorination of fly ash–To improve the capability of the cement kiln to dispose fly ash and avoid clogging, the dechlorination treatment of fly ash is the critical reason for determining whether to adopt cement kiln co-disposal technology;


△ The most effective and economical dechlorination method - water rinsing.


Brief introduction to fly ash chlorine elution by water cleaning and final “zero emission” processes



The process realizes no external discharging of sewage recycling, and all the solid wastes are used twice, completely achieving the harmless ratio, minimization, and resource utilization in the disposal of waste incineration fly ash.

The process consists of five systems: fly ash elution system (highlight), water purification system (core), evaporation salt-making system, mixed drying system, and kiln calcination system. The first four systems are related to fly ash elution and salt removal, and the fifth system is co-disposal with the cement kiln.


Fly ash elution system: Use little water to realize better desalination effect.


Water purification system: Purify the salt removal wastewater to meet the requirements of evaporation.


Evaporation and salt-making system: Evaporate wastewater to make industrial salt.


Mixed drying system: Dry the fly ash after washing.


Kiln calcination system: regarding storage, transportation, kiln feeding.


IV. Core equipment for dewatering of waste incineration fly ash after washing – centrifuge


★ Physical properties of fly ash

Material particle size: The average particle size is about 10 μm, of which <5 μm particles account for 20-25%; fly ash and water are pulped at a certain process ratio, and the slurry is viscous; similar to the slurry of desulfurized gypsum, it is strong in alkali (pH > 12), the slurry easier to settle, and the fly ash material density 0.4-1.0;


Chemical composition of fly ash

Main chemical composition of fly ash: 35-40% Ca(OH)2, 20% SiO2, 18-22% chloride ions, about 7-8% potassium and sodium ions, and other components mostly inorganic oxidation;


Technical characteristics of special centrifuge for fly ash slurry dewatering

• Extremely low infrastructure investment and good on-site operating environment

Compared with the conventional filter-type equipment (plate-and-frame filter, belt filter, etc.), the centrifuge is compact and efficient, covering only about a third of land, needless of auxiliary gas source, high-pressure water, and with simpler pipe structures at the inlet and outlet. And it features fully enclosed operation and more user-friendly operating environment.


• Operational stability

Filter type equipment (plate-and-frame press, belt filter, etc.) is used to remove solid particles by filtration. Viscous solid particles easily cause clogging of the filter cloth, reducing the dehydration performance, and the filter cloth after bonding cannot be reused. The centrifuge, however, relies on the difference in specific gravity of the solid-liquid itself. The centrifugal force generated by high-speed rotation quickly separates solid from liquid, making the production line realize continuous and stable operation, and lowering the subsequent maintenance cost and the labor intensity of operators.


Centrifuge wear-resistant measures and means (one of the key technologies for stable operation of the centrifuge and for reduction of later-stage operating cost)


Fully automatic control mode: Programmatic automatic control mode from start to separation to cleaning to stop reduces human intervention during the operation of the equipment and lowers the requirements on operator quality;

Intelligent control mode: It is equipped with sensors for vibration measurement, temperature measurement, speed, etc., which strengthens the capability to predict and solve equipment operation failures;


Centrifuge's automatic control system



Fly ash residual chlorine content

The water content control of the slag phase after the three-stage water rinsing by the centrifuge is the key to ensure the residual chlorine content of the fly ash. After treatment by the [ZK Separation] centrifuge, the residual chlorine content of fly ash can be stably controlled at ≤0.5~1%.

Fly ash after waste incineration


Fly ash after salt removal by the washing system Crystallized salt Crystallized potassium chloride Crystallized sodium chloride


Fly ash disposal capacity and centrifuge configuration


V. Three-phase centrifuge model and technical parameters


ItemUnitLW450×1845BLW520×2150BLW580×2400BLW650×2600B
Throughputm3/h10-1525-3030-3540-50
Roller diametermm450520580650
Length-diameter ratio4.14.14.14
Speedrpm3200280026002400
Separation factor2580228323522097
Differential speedrpm1~341~341~301~28
Main motor powerkW37557590
Ancillary motor power (kW)kW1518.52230
Weightkg4200520065007800
Boundary dimension (L*W*H)mm4300×1150×14505100×1250×16005520×1450×17006000×1650×1800

Note: The throughput is related to material characteristics.

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