Continuous in-line gasification/vitrification process for thermal waste treatment: process technology and current status of projects

Calaminus, B.; Stahlberg, R.

doi:10.1016/s0956-053x(98)00136-6

Cited by 40 publications

(22 citation statements)

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“…Its role is to cool the combustion gases quickly to approximately 75°C so as to minimize any production of dioxins, furans or other organic compounds. The shock-like cooling avoids the formation of the aforementioned compounds from elementary molecules in the synthesis gas due to the de novo Synthesis back reactions (Calaminus & Stahlberg, 1998). These reactions are known to occur in waste heat boilers where a slow cooling in the range from 400°C to 250°C of flue gases with chlorine compounds, non combusted organic molecules and catalysts such as dust will result in dioxin formation.…”

Section: Photo 6 Feeding Systemmentioning

confidence: 99%

Solid Waste Management through the Application of Thermal Methods

Μουστάκας¹,

Loizidou²

2010

Waste Management

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Section: Photo 6 Feeding Systemmentioning

confidence: 99%

Solid Waste Management through the Application of Thermal Methods

Μουστάκας¹,

Loizidou²

2010

Waste Management

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“…Nevertheless, there is a potentially serious trouble in the gears and the sealing assembly for long-time corrosion by acidic gases at high temperature. The thermoselect process is equipped with an indirect-heating degasification channel (400°C-600°C), an oxygen-blown gasifier and a fixed-bed melting furnace whose temperature is about 2000°C [16]. It uses a hydrodynamic system to make MSW move forward instead of a gear-driven system, avoiding potential corrosion and gas emissions.…”

Section: Introductionmentioning

confidence: 99%

“…However, the investment and operating costs of the high temperature parts and the oxygen supply system are very high. The Direct-Melting process tries to integrate gasification, combustion and melting together in a single blast furnace, and the temperature of the bottom is maintained over 1800°C by adding auxiliary fuels and rich-oxygen-air [16]. It seems a simple option for MSW treatment, but a lot of auxiliary fuel (char or oil) is needed to maintain the high temperature, which is not encouraged in China.…”

Section: Introductionmentioning

confidence: 99%

A steam dried municipal solid waste gasification and melting process

Xiao

Jin

et al. 2011

Front. Environ. Sci. Eng. China

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Considering high-moisture municipal solid waste (MSW) of China, a steam dried MSW gasification and melting process was proposed, the feasibility was tested, and the mass and energy balance was analyzed. Preliminary experiments were conducted using a fixed-bed drying apparatus, a 200 kg per day fluidized-bed gasifier, and a swirl melting furnace. Moisture percentage was reduced from 50% to 20% roughly when MSW was dried by slightly superheated steam of 150°C-350°C within 40 min. When the temperature was less than 250°C, no incondensable gas was produced during the drying process. The gasifier ran at 550°C-700°Cwith an air equivalence ratio (ER) of 0.2-0.4. The temperature of the swirl melting furnace reached about 1240°C when the gasification ER was 0.3 and the total ER was 1.1. At these conditions, the fly ash concentration in the flue gas was 1.7 g$(Nm 3 ) -1 , which meant over 95% fly ash was trapped in the furnace and discharged as slag. 85% of Ni and Cr were bound in the slag, as well as 60% of Cu. The mass and energy balance analysis indicates that the boiler heat efficiency of an industrial MSW incineration plant reaches 86.97% when MSW is dried by steam of 200°C. The boiler heat efficiency is sensitive to three important parameters, including the temperature of preheated MSW, the moisture percentage of dried MSW and the fly ash percentage in the total ash.

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“…In order to eliminate the secondary pollution of MSW incineration, a gasification and melting system is proposed in developed countries. Some processes of MSW gasification and melting system have been developed and demonstrated [5][6][7] such as (1) siemens process: it consists of a rotating pyrolysis drum (at 450°C-550°C) heated indirectly by flue gas and a combustion and melting furnace at 1,250°C-1,400°C; (2) fluidized bed process: it consists of a fluidizedbed gasifier (at 450°C-700°C) and a combustion and melting furnace (at about 1,300°C); (3) von roll RCP process: it consists of an oxygen-blown grate-type gasification chamber (at 350°C-600°C) and an oxygen-blown combustion and melting furnace at 1,400°C. The operations of these processes have proved that MSW gasification and melting system are reliable to control the emission of dioxins (less than 0.1 ng TEQ/Nm 3 ) and heavy metals.…”

Section: Introductionmentioning

confidence: 99%

Research on low emission MSW gasification and melting system

Xiao

Chi

et al. 2007

Front. Environ. Sci. Eng. China

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In order to eliminate secondary pollution caused by municipal solid waste (MSW) incineration, a MSW gasification and melting process is proposed. The process is expected to reduce the emission of pollutants, especially heavy-metals and dioxins. In this paper, the combustible components of MSW and simulated MSW were gasified in a lab-scale fluidized bed at 400°C-700°C when the excess air ratio (ER) was between 0.2 and 0.8. The experimental results indicated that the MSW could be gasified effectively in a fluidized bed at approximately 600°C-700°C when excess air ratio was 0.2-0.4. The melting characteristics of two typical fly ash samples from MSW incinerators were investigated. The results indicated that fly ash of pure MSW incineration could be melted at approximately 1,300°C and that of MSW and coal co-combustion could be melted at approximately 1,400°C. When temperature was over 1,100°C, more than 99.9% of the dioxins could be decomposed and most of the heavy-metals could be solidified in the slag. Based on the above experiments, two feasible MSW gasification and melting processes were proposed for low calorific value MSW:(1) sieved MSW gasification and melting system, which was based on an idea of multi-recycle; (2) gasification and melting scheme of MSW adding coal as assistant fuel.

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Continuous in-line gasification/vitrification process for thermal waste treatment: process technology and current status of projects

Cited by 40 publications

References 0 publications

Solid Waste Management through the Application of Thermal Methods

Solid Waste Management through the Application of Thermal Methods

A steam dried municipal solid waste gasification and melting process

Research on low emission MSW gasification and melting system

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