Application Research on deep recovery and utilization technology of flue gas waste heat of coal water slurry boiler

2013 ◽

Vol 340 ◽

pp. 382-387 ◽

Cited By ~ 1

Author(s):

Xiao Li Zhao ◽

Wei Zhu

Keyword(s):

Fly Ash ◽

Fluidized Bed ◽

Flue Gas ◽

Circulating Fluidized Bed ◽

Bottom Ash ◽

Emission Characteristics ◽

Emission Standard ◽

Water Slurry ◽

Sludge Incineration ◽

Coal Water Slurry

Sludge-coal water slurry (SCWS) can be produced by mixing coal water slurry (CWS) with sewage sludge according to differenct ratio. This paper focuses on the combustive feasibility of SCWS in a commercial circulating fluidized bed, and on the emission characteristics of polychlorinated biphenyls (PCBs) in flue gas fly ash and bottom ash during combustion of SCWS. The results indicated that incineration can do very well with the temperature 1000 degree, sludge coal water slurry (SCWS) can be effective in improving sludge incineration rate, if the proportion of sludge is 20%~30%,amounts of PCBs is relatively small in flue gas fly ash and bottom ash. So the best burning rate is 20%-30%. Although incineration flue gas fly ash and bottom ash emission standard don't have PCBs regulations, but since PCBs are toxic organic pollutants, it should be strictly regulated.

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Flow behavior of high-temperature flue gas in the heat transfer chamber of a pilot-scale coal-water slurry combustion furnace

Particuology ◽

10.1016/j.partic.2013.07.007 ◽

2014 ◽

Vol 17 ◽

pp. 114-124 ◽

Cited By ~ 17

Author(s):

Yanwei Zhang ◽

Yu Bo ◽

Yingchun Wu ◽

Xuecheng Wu ◽

Zhenyu Huang ◽

...

Keyword(s):

Heat Transfer ◽

High Temperature ◽

Flue Gas ◽

Flow Behavior ◽

Pilot Scale ◽

Water Slurry ◽

Coal Water Slurry

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Coal-Water Slurry Fuel: Current Status and Prospects

Visnik Nacional noi academii nauk Ukrai ni ◽

10.15407/visn2013.08.058 ◽

2013 ◽

pp. 58-65

Author(s):

O.A. Krut ◽

◽

V.S. Bilecky ◽

Keyword(s):

Current Status ◽

Water Slurry ◽

Coal Water Slurry

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An Experimental Investigation of Water Vapor Condensation from Biofuel Flue Gas in a Model of Condenser, (1) Base Case: Local Heat Transfer without Water Injection

Processes ◽

10.3390/pr9050844 ◽

2021 ◽

Vol 9 (5) ◽

pp. 844

Author(s):

Robertas Poškas ◽

Arūnas Sirvydas ◽

Vladislavas Kulkovas ◽

Povilas Poškas

Keyword(s):

Heat Transfer ◽

Water Vapor ◽

Flue Gas ◽

Waste Heat Recovery ◽

Waste Heat ◽

Water Injection ◽

Vapor Condensation ◽

Base Case ◽

Water Vapor Condensation ◽

Condensing Heat Exchanger

Waste heat recovery from flue gas based on water vapor condensation is an important issue as the waste heat recovery significantly increases the efficiency of the thermal power units. General principles for designing of this type of heat exchangers are known rather well; however, investigations of the local characteristics necessary for the optimization of those heat exchangers are very limited. Investigations of water vapor condensation from biofuel flue gas in the model of a vertical condensing heat exchanger were performed without and with water injection into a calorimetric tube. During the base-case investigations, no water was injected into the calorimetric tube. The results showed that the humidity and the temperature of inlet flue gas have a significant effect on the local and average heat transfer. For some regimes, the initial part of the condensing heat exchanger was not effective in terms of heat transfer because there the flue gas was cooled by convection until its temperature reached the dew point temperature. The results also showed that, at higher Reynolds numbers, there was an increase in the length of the convection prevailing region. After that region, a sudden increase was observed in heat transfer due to water vapor condensation.

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