JP2702898B2 - Ultra-small premixing device for high load gas fuel combustion of gas boiler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultra-compact premixing apparatus for high load gas fuel combustion of a gas boiler, and more particularly to a premixing type gas burner widely used for gas combustion equipment. The gas fuel and combustion air are premixed (premixed) to achieve complete combustion when burned with the mixed fuel gas by the gas burner, maximizing boiler heat generation efficiency and at the same time harmful gases generated during combustion Is to be minimized.

[0002]

Generally, most of gas burners mainly used for gas-fired appliances such as household gas boilers generally have flame stability of the burner and a flashback phenomenon of the flame. Semi-Bunsen gas burners, which have advantages such as low risk of generation, are mainly used, but such semi-Bunsen gas burners have a long flame that is structurally formed by a burner. , in fact combustion air loss due to combustion exhaust gas because the amount is required much larger amounts of excess air than the stoichiometric amount of air and NO _X, emissions of polluting substances such as CO or the like is often required during combustion In addition, the direction in which the gas burner is attached to gas boilers and other gas-fired equipment is limited to upwards, so there is a certain limit to improving the efficiency and maximizing the efficiency of gas-fired equipment. There is a problem that they have.

A pre-mixer of the Venturi type is mainly used as a pre-mixer for mixing the combustion air and gaseous fuel before the combustion, but the pre-mixer of the Venturi type has a large structure and is complicated. And some of them are used in gas combustion equipment, that is, a gas fuel nozzle and several rotating blades (Sw
In the pre-mixer of the type in which the irler is installed, since the gas fuel jet nozzle is drooped, not only the mixing ratio of combustion air and gas fuel is not uniformly formed over the entire burner, but also the pressure loss due to the use of the rotating blades. There are also disadvantages such as large.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned various problems, and the present invention is directed to a premixing type gas widely used for small gas combustion equipment. When mixing the gas fuel supplied to the burner and the combustion air in advance, in order to prevent fluctuations in the amount of combustion air due to disturbances such as fluctuations in air pressure, etc., resulting in non-uniform mixing and incomplete combustion. In addition, by forming a Venturi-shaped internal body, always maintaining a constant mixing ratio of combustion air and gas fuel during mixing, and by performing complete combustion when the mixed fuel gas is burned by the gas burner, The aim is to provide an ultra-compact premixing device for high-load gas-fuel combustion of gas boilers that maximizes the thermal efficiency of the boiler and minimizes the generation of harmful gases generated during combustion. There is.

According to an embodiment of the present invention for achieving the above object, a gas fuel supply port for supplying fuel to one side of an outer body is provided, and a plurality of nozzles are formed in a circumferential direction of the inner body. Forming a first chamber and a second chamber for forming and ejecting gaseous fuel at the same pressure on both inner sides of the outer body, forming a small gap connecting the first chamber and the second chamber; This is a small premixing device for combustion of a high-load gas fuel, which has a small venturi section so that the combustion air and the gas fuel can be uniformly mixed inside the inner main body.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention having the above-mentioned objects and features will be described in detail with reference to FIGS. In recent years, the combustion surface of a gas burner attached to a gas combustion device such as a gas boiler has a high load per unit area using a porous plate of ceramics, stainless steel, or metal fiber structure with high durability and corrosion resistance. In addition to being able to burn, the flame length of the burner is short, so it can be designed in an ultra-compact structure, and the thermal efficiency can be improved by high load combustion, so the surface of the gas burner is durable and corrosion resistant At the same time as replacing with porous plates of strong ceramics, stainless steel or metal fiber structure, such mixed fuel gas is supplied after the combustion air and gas fuel are completely mixed (premixed) before they are burned. The mixing device formed in the premixed gas burner that burns on the combustion surface above the burner is a gas burner that burns the premixed fuel gas. Short length of flame which is made started, and because small excess amount of air alone combustion performance is improved, with a small amount of loss by the exhaust gas NO _X, not only is less pollution emissions such as CO, etc. The burner can be installed vertically or downward in the gas combustion equipment, so it is possible to reduce the exhaust gas temperature and use a corrosion-resistant material that can withstand enough in an environment where low-temperature corrosion occurs. Then, the efficiency of the gas boiler is maximized by forming a structure capable of absorbing the latent heat of the condensed water generated by reducing the exhaust gas temperature.

According to the present invention, as shown in FIG.
And a plurality of nozzles 3a, 3 formed in the circumferential direction of the inner main body 3 for supplying fuel to one side of the fuel cell.
b, and a first chamber 1a and a second chamber 1b for forming and ejecting gas fuel at the same pressure on both sides inside the outer main body 1 are formed, and the first chamber 1a is formed.
And a small gap 1c connecting the second chamber 1b and a venturi 3d for uniformly mixing fuel and air is formed inside the inner main body 3.

The operation of the present invention described above is as follows.
The gas fuel supplied through the gas fuel supply port 2 becomes stable while being uniformly filled in the circumferential direction in the first chamber 1a, and then passes through the gap to fill the second chamber 1b again. When jetting from the nozzles 3a and 3b pierced at a constant distance in the circumferential direction of the inner body 3 while forming the same pressure in the circumferential direction, combustion air is generated inside the inner body 3 by air pressure or air volume due to disturbance. In the case where the supply of combustion air is not constant due to the change of the pressure, the influence on the supply amount of gas fuel ejected from the nozzles 3a and 3b is reduced, and at the same time the supply from the nozzles 3a and 3b of the venturi section 3d Gas fuel is changed to the negative pressure of air generated from the air flow, and the mixture ratio of gas fuel and combustion air is always kept constant and flows into the boiler burner Would like to combustion is.

[0009]

Accordingly, the present invention can be formed so as to have a structure which is smaller in size but less in pressure drop and loss as compared with the gas burner premixer used so far, When the air and gas fuel flow to one side, the equivalence ratio becomes partially different, eventually resulting in the flame on the burner combustion surface also becoming hard, resulting in poor burner combustion performance. The burner has a short flame length as much as possible, and a venturi-shaped inner body is formed to completely mix the gaseous fuel and combustion air so that the mixed fuel gas does not sway in the flow even in a small space. It minimizes the generation of harmful gases during combustion, maximizes the thermal efficiency of the gas boiler, and considers the ease and convenience of burner production. An invention of utility in use.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view when a main part is cut away.

FIG. 2 is a longitudinal sectional view of the present invention.

FIG. 3 is an installation state diagram of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 External main body 1a 1st chamber 1b 2nd chamber 1c Projecting part 2 Gas fuel supply port 3 Internal main body 3a, 3b nozzle 3d Venturi part

Continued on the front page (72) Inventor Park Byung-Sik, Republic of Korea, Daejeon-shi, Jun-k, Junchon-dong, Kumuhoa Part 1-1406 (No address) (72) Inventor Kim Jong-jin, Republic of Korea, Daejeon -Shi, Yusun-ku, Eo-Eun-Dong, 99, Hanbit Apartment 133-903 (56) References JP-A-48-36733 (JP, A) Japanese Utility Model Application 62-118921 (JP, U)

Claims (1)

(57) [Claims] 1. A gas fuel supply port (2) for supplying fuel to one side of an outer main body 1 is provided, and a plurality of nozzles (3a, 3b) are formed in a circumferential direction of the inner main body (3). A first chamber (1a) and a second chamber (1b) for forming and ejecting gaseous fuel at the same pressure on both sides of the outer body (1); and forming the first chamber (1).
a) and a small gap (1c) connecting the second chamber (1b) and a venturi section (3d) inside the inner body (3) so that the combustion air and gaseous fuel can be uniformly mixed. An ultra-compact premixing device for combustion of a small, high-load gas fuel, characterized in that it is formed.