Injection of hot particles in the plasma flame

ABSTRACTA unique and efficient plasma jet reactor has been developed and used to study the high temperature production of carbon monoxide from a reaction between powdered carbon and a pure carbon dioxide plasma. The plasma jet reactor was designed to allow the injection of powdered carbon above the arc discharge region rather than into the plasma flame below the arc discharge region. High yields of carbon monoxide, produced at relatively high efficiencies, were a direct result of this technique. The plasma jet was also designed to enable rapid changing and testing of various anode insertsAverage yields of carbon monoxide in the product gases were as high as 80–87% in selected experimental trials. Carbon monoxide was produced at rates exceeding 15,000 1/hr (at STP) with a power expenditure of 52 Kw.

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Fabrication and Ablation Behavior of Plasma Sprayed ZrC-W Composite Coatings

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.602-603.552 ◽

2014 ◽

Vol 602-603 ◽

pp. 552-555

Author(s):

Dan Lu ◽

Ya Ran Niu ◽

Xue Lian Ge ◽

Xue Bing Zheng ◽

Guang Chen

Keyword(s):

Thermal Conductivity ◽

Thermal Shock ◽

Plasma Spray ◽

Composite Coatings ◽

Lamellar Microstructure ◽

Atmospheric Plasma Spray ◽

Atmospheric Plasma ◽

Plasma Flame ◽

Plasma Sprayed ◽

Zrc Coating

In this work, atmospheric plasma spray (APS) technology was applied to fabricate ZrC-W composite coatings. The microstructure of the composite coatings was characterized. The influence of W content on the ablation-resistant and thermal shock properties of ZrC-W composite coatings was evaluated using a plasma flame. The results show that the ZrC-W composite coatings had typically lamellar microstructure, which was mainly made up of cubic ZrC, cubic W and a small amount of tetragonal ZrO2. The ZrC-W coatings had improved ablation resistant and thermal shock properties compared with those of the pure ZrC coating. It was supposed that the improved density, thermal conductivity and toughness of the composite coatings contributed to this phenomenon.

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Solids Flow Pattern in the Bottom Zone of a Rectangular Cross-Section Circulating Fluidized Bed

17th International Conference on Fluidized Bed Combustion ◽

10.1115/fbc2003-043 ◽

2003 ◽

Author(s):

Hong-Shun Li ◽

Yi-Jun Wang ◽

Shi-Ping Jin

Keyword(s):

Flow Pattern ◽

Fluidized Bed ◽

Cross Section ◽

Quartz Sand ◽

Circulating Fluidized Bed ◽

Rectangular Cross Section ◽

Temperature Response ◽

Cold Model ◽

Hot Particles ◽

Bottom Zone

Solids flow pattern in the bottom zone of a rectangular cross-section CFB was investigated by using hot particles as the tracer. The experiments were carried out in a cold model circulating fluidized bed. The riser has an inner cross-section of 0.3 m by 0.5 m and a height of 5.8 m. The solids were returned into the riser at a height of 0.75 m above the air distributor within an angle of about 40 degree. Quartz sand was used as the bed material. The hot particles were also quartz sand but with a little smaller size. Specially designed miniature electrically heating devices were installed flush with the inner bed wall or inside the bed. At each run, about 10–15 cm3 hot particles were slowly pulled into the bed. The temperature response around the device was measured with four copper-constantan thermocouples. Based on the experimental results, a 3-D core-annulus model describing the solids flow pattern in the bottom zone of the CFB riser is proposed.

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Plasma Resource Recovery Technology: Converting Waste to Energy and Valuable Products

13th North American Waste-to-Energy Conference ◽

10.1115/nawtec13-3155 ◽

2005 ◽

Cited By ~ 5

Author(s):

Pierre Carabin ◽

Gillian Holcroft

Keyword(s):

Carbon Monoxide ◽

Construction Material ◽

Resource Recovery ◽

Waste To Energy ◽

Small Scale ◽

Cruise Ship ◽

Plasma Flame ◽

Fuel Gas ◽

The Core ◽

Core Technology

Plasma Resource Recovery (PRR) is a revolutionary technology that can treat virtually any type of waste by combining gasification with vitrification. Vitrification produces inert slag that can be used as a construction material. Gasification produces a fuel gas containing carbon monoxide (CO) and hydrogen (H2), used for cogeneration of electricity and steam. The plasma fired eductor which is the core technology of the PRR system is presently being used commercially on a cruise ship at a scale of 5 TPD. The capabilities of the PRR technology have been demonstrated in a pilot plant, at a rate of up to 2 TPD of various types of waste. Because of the high intensity of the plasma flame and the reduced amounts of gases produced in a gasification system, compared to traditional combustion systems, the PRR system is typically very compact. As such, the PRR technology opens the door for a decentralized, small scale approach to waste management.

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