Heat exchanger of fluid-bed of fluid solid outer circulation advocate press falling experimental research
Liu Yan, zhang Shaofeng, wei Jianming, li Jingong
(chemical college of Heibei industry university, tianjin 300130)
Summary: The heat exchanger of fluid-bed of fluid solid outer circulation that is grain loop device with nozzle is research target, inspect grain diameter, caliber comparing, nozzle to install the position, grain initiative join quantity and fluid viscosity to be opposite advocate control falling impact, reached stability operates a circumstance to fall, heat exchanger of fluid-bed of fluid solid outer circulation advocate pressure fall to involve couplet type with the experience between afore-mentioned elements, computational value and experimental value be identical are better, for the design of heat exchanger of outer circulation fluid-bed computation provides a basis.
Keyword: Heat exchanger; Fluid-bed of fluid solid outer circulation; Advocate pressure fall; Nozzle
The graph classifies date in: Label of TQ 051 document piles up: A article number: 1000 – 6613 (2007) 1489 – of 10 – 04
Heat exchanger of fluid solid fluid-bed conducts heat with its coefficient is tall, can prevent the characteristic such as knot dirty to have extensive applied value, and heat exchanger of fluid-bed of fluid solid outer circulation has equipment measure again small, grain and liquid depart are easier wait for distinct advantage, have applied perspective more.
Of heat exchanger of outer circulation fluid-bed advocate pressure fall affect interstitial rate to distributing the raise analyse carry secretly that reachs solid grain, and distributing with chroma of grain of the solid inside the bed close together and relevant, and grain chroma is to conduct heat calculative is important according to, be power plant at the same time choose provide a basis. Because this studies condition of flow of solid of the fluid inside the bed is mixed,press fall distributing, run the port with reach a design to have very principal to the stability of fluid-bed. Article author is the outer circulation fluid-bed of grain loop device to be research target with nozzle, inspect grain diameter, caliber comparing, nozzle to install the position, grain initiative join quantity and fluid viscosity to be opposite advocate control falling impact, for the design of heat exchanger of outer circulation fluid-bed computation provides a basis.
1 experiment device reachs flow
Experimental device is shown 1 times like the graph. It is facilitating observation, experimental equipment is made by transparent organic glass. The experiment is used inside the cold pattern heat exchanger that sets 18 canals, every canal grows 1000 Mm, internal diameter is 25 Mm, show the triangle is arranged, tubal span is 32 Mm. This experiment uses U form to press difference plan to measure promotion paragraph pressure fall, measure those who press aperture to be set in heat exchanger respectively to go up tubal box and box leaving a valve; Press with what pressure watch measures nozzle around fall, the span that pressure expresses is 0.25 MPa, precision is 1.6. The goal that sets nozzle is control grain internal circulating load, but the condition of installation position convection of nozzle turns an operation crucial, reasonable nozzle structure design is helpful for those who form stability shedding voice to change, it is even whether the key of circular liquefaction. The structure of nozzle and installation position are shown 2 times like the graph.
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