Huzhou City 50,000 tons/year garbage fly ash harmless disposal and resource utilization project
Project Overview
The Huzhou City 50,000 tons/year Waste Incineration Fly Ash Harmless Disposal and Resource Utilization Project is a key project focused on the environmentally friendly treatment of waste incineration fly ash. Located in Longquanwu, Miaoxi Town, Wuxing District, Huzhou City, Zhejiang Province, it is a collaborative effort between Huzhou Jinglan Environmental Protection Technology Co., Ltd. and Zhejiang Jinsen Renewable Resources Development Co., Ltd. (Party A) and Nanjing CSIC Oasis Environmental Protection Co., Ltd. (Party B), respectively. The project utilizes low-temperature pyrolysis technology to achieve harmless disposal and resource utilization of fly ash, which is of great significance to the protection of the regional ecological environment.
The core objective of this project is to remove and reduce persistent organic pollutants (POPs) such as dioxins from waste incineration fly ash. The treated fly ash will undergo a water washing system to remove chlorides and heavy metals. The wash wastewater will be reused through water treatment, evaporation and crystallization, and a salt separation system, forming a closed-loop "treatment-recovery-reuse" process. The project has a total annual treatment capacity of 50,000 tons and will be constructed in two phases:
• Phase I: 30,000 tons/year, including one 30-ton/day fly ash dioxin treatment system (co-constructed by Zhejiang Jinsen Renewable Resources Development Co., Ltd. and Nanjing CSIC Oasis Environmental Protection Co., Ltd.) and two 36-ton/day fly ash dioxin treatment systems (co-constructed by Huzhou Jinglan Environmental Protection Technology Co., Ltd. and Nanjing CSIC Oasis Environmental Protection Co., Ltd.). Each system is designed for an annual operating time of 7,500 hours.
• Phase II: 20,000 tons/year. Construction and acceptance will be phased in based on the operational performance of Phase I. Upon completion, the project will significantly enhance Huzhou's capacity for the harmless disposal of fly ash. Core Process: Low-Temperature Pyrolysis for Dioxin Removal
The project utilizes a low-temperature pyrolysis process combining two-stage spiral heating, nitrogen sealing, and indirect water cooling. The core process consists of five steps: pre-startup preparation, feeding, heating, discharging, and pyrolysis gas treatment:
1. Pre-Startup Preparation: Oxygen in the reactor is replaced with nitrogen (controlling the exhaust oxygen content to <0.5%). Simultaneously, the heating device is activated for preheating, ensuring that the hot air temperature gradually reaches the set value. The cooling device and the reactor drive motor are then activated simultaneously.
2. Feeding: A combined "feeding hopper + star feeder + spiral feeder" system is employed to achieve quantitative and uniform feeding (a single system has a feeding capacity of 0-5 t/h). The feed hopper is equipped with a roof dust collector (dust emission concentration <30 mg/Nm³) and a nitrogen protection device to prevent backflow of pyrolysis exhaust gases. 3. Heating: Fly ash enters a two-stage spiral heater (made of no less than 316L stainless steel, with an inner wall thickness of ≥14mm). The first stage heats the fly ash to 350±20°C, and the second stage maintains the temperature at 380-450±5°C. The residence time per stage is 60 minutes (90 minutes for a 30t/d system). Frequency conversion is used to control the heating rhythm to ensure sufficient dioxin decomposition.
4. Discharge: The pyrolyzed fly ash enters a two-stage water-cooled spiral, where the temperature is reduced to <70°C within 30 minutes. It is then transported to a discharge silo for temporary storage. The silo is equipped with a sampling port for real-time analysis. 5. Pyrolysis Gas Treatment: The pyrolysis gases generated by the two-stage heating process are collected and passed through a ceramic tube dust collector (400°C temperature resistance, 1000-1500 Pa air resistance) to remove particulate matter (controlling emission concentration to <30 mg/Nm³). The gases are then fed into Party A's flue gas purification system for subsequent treatment. The burner exhaust complies with the "Boiler Air Pollutant Emission Standard" (GB13271-2014), with NOx emissions below 50 mg/Nm³ (baseline oxygen content 11%). This exhaust is discharged through a 20-meter high-carbon steel chimney (a 15-meter high 304 stainless steel chimney for a 30 t/d system).
This project is a key initiative in Huzhou City's efforts to achieve a "Zero Waste City" goal. By leveraging advanced low-temperature pyrolysis technology, it effectively addresses dioxin pollution in waste incineration fly ash, enabling fly ash resource utilization and reducing the amount of hazardous waste landfilled. The project also strictly adheres to environmental and safety standards, with waste gas and wastewater emissions meeting national regulations. This plays a significant role in improving regional environmental quality and protecting public health, and also provides a valuable technical and management model for similar waste fly ash disposal projects.
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