论文总字数：21632字

摘 要

本文针对原有商用大锅灶的燃烧技术，通过研究其发展的现状，总结出了燃烧过程中存在的一些普遍问题。例如，大锅灶普遍采用封闭式炉膛，炉膛内易形成正压，进一步减小引射能力，因此大气式燃烧器已难以满足大锅灶的要求。鼓风扩散式燃烧器功率有所提高，但鼓风扩散式燃烧器火焰长，造成有些炉灶燃气出炉膛后仍未烧尽，排烟处冒火，墙壁处积碳、发黑，瓷砖碎裂，严重影响厨房环境。而预混式燃烧器的优点能够弥补前两种燃烧器的一些不足，是较适用于大功率大锅灶的燃烧器种类。

针对引射器的现有技术，对引射阶段、混合阶段和扩压阶段三个过程进行分析。首先分析引射器的整体工作流程，然后具体分析流体在喷嘴、混合管和扩压管中。随着流体的流动压力和速度变化的关系。在引射时，风机加压后的一级空气引射管道内的天然气。然后在混合管中混合，并在混合管出口处达到均匀。接着进入扩压管升压，使混合气压力升高，并顺利到达灶头进行燃烧。

在双级全预混引射器的设计过程中，首先在计算好两级引射器中各部件的计算基础上，还要分析各部件之间的关系，如喷嘴出口即是混合段进口，还有一二级引射器之间的位置关系。还要分析整个引射器的引射性能，如引射比，混合管出口压升，扩压管出口压升等。

最后得出了一级截面比对一级混合管出口压升的影响规律、二级截面比对引射器出口压力的影响规律、一级空气系数对扩压管出口压力的影响规律，以及燃气种类影响。综合以上的分析，可以得出最佳的双级引射器结构尺寸。

关键词：大锅灶 双级引射器 全预混 理论模型 性能分析

Design and Performance Analysis of the fully premixed large stove ejector

Abstract

In this paper, the combustion technology of the commercial stove is studied, and some common problems in the combustion process are summarized by studying the present situation of its development. For example, large pots generally use closed-type furnace, the furnace is easy to form a positive pressure, to further reduce the ability to eject, so the atmosphere burner has been difficult to meet the requirements of large stove. Blow diffuse burner power has improved, but the blast diffuse burner flame long, causing some stove gas out of the furnace has not burned, smoke at the smoke, the wall carbon deposition, black, tile fragmentation, Seriously affecting the kitchen environment. The advantages of the pre-blended burner can compensate for some of the shortcomings of the first two burners, and are more suitable for high-power large cookers.

The three processes of the ejecting stage, the mixing stage and the diffuser phase are analyzed for the prior art of the ejector. First analyze the overall workflow of the ejector, and then analyze the fluid in the nozzle, the mixing tube and the diffuser tube. With the flow of fluid pressure and speed changes in the relationship. At the time of the ejection, the air pressure of the primary air after the fan is injected into the pipeline. And then mixed in a mixing tube and reached a uniform at the outlet of the mixing tube. And then into the expansion tube boost, so that the pressure of the mixture increased, and successfully reached the stove for combustion.

In the design of the two-stage pre-mixed ejector, the relationship between the components is analyzed on the basis of calculating the calculation of the components in the two-stage ejector. If the nozzle outlet is the mixed section, There is also a positional relationship between the secondary ejectors. But also to analyze the ejector performance of the entire ejector, such as the ejector ratio, the outlet pressure of the mixing tube, and the pressure rise of the diffuser tube.

Finally, the influence rule of the first-order cross-section ratio on the outlet pressure of the primary mixing pipe, the influence of the secondary section on the outlet pressure of the ejector, the influence of the primary air coefficient on the outlet pressure of the diffuser, Species effects. Based on the above analysis, we can get the best two-stage ejector structure size.

Key Words: big stove; two - stage ejector; full premixed; theoretical model; performance analysis

目录

摘 要 I

Abstract II

第1章 绪论 1

1.1背景意义 1

1.2课题研究 3

1.3现有技术 3

1.4国内外研究现状 4

1.5本章小结 6

第2章 全预混大锅灶引射器的结构 7

2.1结构简介 7

2.2工作原理 8

2.3性能要求 8

2.4小结 9

第3章 全预混大锅灶引射器的理论模型 10

3.1喷嘴计算 11

3.2吸入室计算 11

3.3混合管计算 13

3.3.1计算流程图 15

3.4扩压管计算 16

3.5大锅灶引射器结构设计程序图 16

3.6小结 17

第4章 商用45kW大锅灶的性能分析 18

4.1 已知条件 18

4.2 燃烧计算 18

4.3 对比方案 19

4.4计算结果及性能比较 21

4.4.1 一级截面比对一级混合管出口压升的影响规律 21

4.4.2 二级截面比对引射器出口压力的影响规律 22

4.4.3 一级空气系数对扩压管出口压力的影响规律 23

4.4.4 燃气种类影响 24

4.5 双级全预混引射器计算结果汇总 27

4.6 本章小结 28

第5章 总结与展望 29

5.1 总结 29

5.2 未来工作建议 29

参考文献 31

致谢 33

第1章 绪论

1.1背景意义

在全球化高速发展的今天，世界上许多的国家对能源也是有着越来越大的需求，如今的能源发展结构里，煤炭、石油和天然气^[1]依然是我们现在主要利用的能源。当下国内的经济也必须要转型发展，因此更加需要能源的保驾护航，才能为经济高速发展提供动力。但是我国的工业还是属于发展中，主要还是依赖煤炭等传统能源^[2]，这样肯定会对目前的工业发展产生影响。

在商用燃气灶具能效分析比较中，对目前市场上的炒菜灶、大锅灶和蒸箱做了热效率的比较^[3]，结论如下:

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