ASH FUSION CHARACTERISTIC OF FOOD WASTE DIGESTATE AND MUNICIPAL SOLID WASTE DURING CO-COMBUSTION PROCESS

ZOU Qihong; YU Zhaosheng; WEI Chen; MA Xiaoqian

doi:10.13205/j.hjgc.202305010

Volume 41 Issue 5

May 2023

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ZOU Qihong, YU Zhaosheng, WEI Chen, MA Xiaoqian. ASH FUSION CHARACTERISTIC OF FOOD WASTE DIGESTATE AND MUNICIPAL SOLID WASTE DURING CO-COMBUSTION PROCESS[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(5): 69-74,178. doi: 10.13205/j.hjgc.202305010

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ZOU Qihong, YU Zhaosheng, WEI Chen, MA Xiaoqian. ASH FUSION CHARACTERISTIC OF FOOD WASTE DIGESTATE AND MUNICIPAL SOLID WASTE DURING CO-COMBUSTION PROCESS[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(5): 69-74,178. doi: 10.13205/j.hjgc.202305010

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ASH FUSION CHARACTERISTIC OF FOOD WASTE DIGESTATE AND MUNICIPAL SOLID WASTE DURING CO-COMBUSTION PROCESS

doi: 10.13205/j.hjgc.202305010

1. School of Electric Power, South China University of Technology, Guangzhou 510641, China;
2. Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization, Guangzhou 510641, China

Received Date: 2022-07-28

Abstract

Abstract

Aiming at the high ash content and slagging problem of food waste digestate (FWD) and municipal solid waste (MSW), the ash fusion characteristic and mineral transformation law of FWD and MSW during co-combustion process were studied by XRF, XRD, SEM, ash fusion temperature measurement and thermodynamic equilibrium simulation. Results showed the main minerals in FWD ash were phosphate and silicate. MSW ash was mainly composed of oxide, such as SiO₂, CaO and MgO, and chloride. The low-temperature eutectic reaction occurred between calcium phosphate and nepheline resulting in the rapid decrease of the solid phase in FWD ash. Refractory mineral, Ca₄Si₂O₈-Ca₃P₂O₈ was generated during the melting of MSW ash, which led to the increase in ash fusion temperature. With the increase of MSW proportion, the deformation temperature increased, but softening temperature (ST), hemisphere temperature (HT), and flow temperature (FT) first decreased and then increased. When the proportion of FWD was less than 10%, the ST, HT and FT all exceeded 1400 ℃, and the slagging index F_s was greater than 1342, showing a weak slagging tendency. The results of this paper would play a guiding role in the collaborative disposal of food waste digestate in municipal solid waste incineration plants.
- food waste digestate,
- municipal solid waste,
- co-combustion,
- ash residue,
- ash fusion characteristic

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References(17)

References

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