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The development of large-scale coal-water slurry nozzles and atomization

Author: LiXiChen
Tutor: HuangZhenYu;CaoXinYu
School: Zhejiang University
Course: Engineering Thermophysics
Keywords: CWS Atomization mechanism Percussive Atomizer Atomizing nozzle Atomization quality Atomization effect Impact angle Flow characteristics Economic and social benefits
CLC: TK223
Type: Master's thesis
Year: 2004
Downloads: 295
Quote: 8
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Abstract


Whereas the CWS technology develops continuously and it has brought economical and social effect, more and more large-capacity boilers are refitted to burn CWS instead of oil or coal. The capacity of customary atomizer can’t settle for the load of the large-capacity boilers. In order to get over this difficulty, we carry out a series of experiments, and investigate the mechanism of atomization. A suit of dashing-style CWS atomizers with 6T/h capacity have been developed..In chapter 2, we have reviewed the development of international CWS atomizers and the methods used to measure parameters of atomization. The atomizing quality and the distributing of the atomizing particle size are described in chapter 3. SMD is thought as the main criterion of atomizing quality.Atomization of liquid fuel is a complex process. The study of atomizing mechanism is very difficult in atomizing technology. In recent years, the international study on atomizing mechanism is still in period of algebra experience. In this thesis, we carry out a series of elementary experiments to research the atomization of air-liquid parallel spraying and air-liquid colliding spraying with certain angle. Equations are educed to describe the relationship between SMD and air momentum in air-liquid parallel spraying, and relationship between SMD and angle in air-liquid colliding spraying with certain angle. It will be a good reference to design the dashing-style atomizer.Due to the high concentration and high viscosity of the CWS, bad atomizing properties and bad wearproof ability are much serious problems all along. After reviewed the international CWS atomizers carefully, it is found that dashing-style CWS atomizers can overcome these difficulties, so we address on experiments of dashing-style CWS atomizer detailedly. The main facts that affect on the atomizing characteristic and load characteristic of dashing-style atomizer are well known. In order to assure good atomizing quality, increase the capacity and simplify structure, we adjust important parameters and develop a suit of dashing-style CWS atomizers with 6T/h capacity. The atomizing characteristic and load characteristic of CWS atomizer are measured by cool-state experiments.Besides, we describe the method of designing simulation of dashing-style CWS atomizer in detail and have finished an automatically simulating program with VB computer language, which will simplify the process of design.

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CLC: > Industrial Technology > Energy and Power Engineering > Steam Power Engineering > Steam boiler > Boiler constructed
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