Micro-combustor

A burner, micro-miniature technology, used in burners, gas fuel burners, combustion types, etc., can solve the problems of unsustainable catalytic effect of catalysts, increase the complexity of system processing, reduce the compactness of burners, etc., to shorten the ignition time The effect of prolonging time, reducing energy and reducing heat dissipation loss

Inactive Publication Date: 2011-09-14
HUAZHONG UNIV OF SCI & TECH
5 Cites 19 Cited by

AI-Extracted Technical Summary

Problems solved by technology

But the complex three-dimensional structure of this burner makes its machining very difficult
In addition, Zhong Jingjing et al. have proposed a miniature catalytic burner, however, the catalytic effect of the catalyst is not durable
The research team...
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Abstract

The invention discloses a micro-combustor, which comprises a bluff body, two preheating channels and a combustion chamber, wherein the preheating channels and the combustion chamber are all plate-shaped; the cross section of the bluff body is triangular or circular; the bluff body is arranged at an inlet of the combustion chamber; the ratio of the width of the bluff body to the width of the combustion chamber is 0.3-0.6; the two preheating channels are both L-shaped and are respectively arranged at upper and lower sides of the combustion chamber; and outlets of the preheating channels are both communicated with the inlet of the combustion chamber. By using the micro-combustor, the defect of the prior art is overcome. By preheating and catalyzing fuels and air (when a non-pre-mixing combustion mode is adopted) or the pre-mixture of the fuels and air (when a pre-mixing combustion mode is adopted), the energy used for igniting is lowered, the igniting delay time is shortened and the exhaust heat loss is reduced. Besides, a low-speed high-temperature recirculation region formed behind the bluff body is utilized to fully mix the fuels and air, prolong the gas retention time and stabilize the flame. The micro-combustor can be used for efficiently expanding the stable combustion limit and increasing the combustion efficiency and can be widely applied to various micro-power systems.

Application Domain

Technology Topic

Image

  • Micro-combustor
  • Micro-combustor
  • Micro-combustor

Examples

  • Experimental program(1)

Example Embodiment

[0015] The present invention will be described in more detail below in conjunction with the drawings and embodiments, but the following embodiments are only illustrative, and the protection scope of the present invention is not limited by these embodiments.
[0016] Such as figure 1 As shown, the micro burner provided by the present invention includes gas inlets 1 and 2, tail gas outlet 3, bluff body 4, preheating channels 5 and 6, and combustion chamber 7. The preheating passages 5 and 6 and the combustion chamber 7 are all flat plates.
[0017] The bluff body 4 is installed at the entrance of the combustion chamber, the cross section of the bluff body is triangular or cylindrical, and its surface can be sprayed with platinum (Pt) and other common catalysts. Width of bluff body 4 W b And the width W of the combustion chamber 7 c The ratio is between 0.3 and 0.6. The preheating channels 5 and 6 are both L-shaped and arranged on the upper and lower sides of the combustion chamber 7, and the outlets of the preheating channels 5 and 6 are connected to the inlet of the combustion chamber 7. .
[0018] Fuel and air (when the non-premixed combustion method is used), or their premixes (when the premixed combustion method is used) enter the flat-plate micro-combustion chamber 7 from inlets 1 and 2 through preheating channels 5 and 6, respectively. Preliminary mixing is carried out at the entrance, and then further mixing is carried out behind the bluff body 4 (when non-premixed combustion method is adopted), and then ignited and burned. The high-temperature exhaust gas is discharged from the exhaust gas outlet 3 of the combustion chamber, which can be used as a micro thermoelectric device Or the micro thermal photovoltaic system provides the heat source, or it can be used as the high temperature gas of the micro propulsion system to generate thrust through the subsequent nozzle.
[0019] Here is an example: the premixed combustion method of hydrogen and air is adopted, the width of the two preheating channels is 0.5mm, the width of the combustion chamber is 1.0mm, the length is 10mm, and the cross-sectional shape of the bluff body is equilateral with a side length of 0.5mm. triangle. The solid material adopts high temperature resistant quartz glass, and the thermal properties are as follows: density, heat capacity, thermal conductivity and normal emissivity are 2650kg/m respectively 3 , 750J/(kgK), 1.05W/(m 2 K) and 0.92. Using the universal CFD calculation software Fluent, and using the detailed chemical reaction mechanism of the reaction between hydrogen and oxygen (including 19 reversible reactions and 13 components), a numerical simulation was carried out for the equivalent ratio of premixed gas in the range of 0.4-1.0. The results It shows that the blow-out limit of the present invention is 2-4 times that of a single-layer plate burner, such as image 3 Shown. At the same time, the combustion efficiency is also higher than that of a single-layer plate burner, such as Figure 4 Shown (equivalent ratio is 0.5). These prove that the burner of the present invention has the advantages of high efficiency and stable combustion.
[0020] The above are the preferred embodiments of the present invention, but the present invention should not be limited to the content disclosed in the embodiments and the drawings. Therefore, any equivalent or modification completed without departing from the spirit disclosed by the present invention falls within the protection scope of the present invention.
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