KR0148092B1 - Small premixing chamber for high gas load of gas boiler - Google Patents

Abstract

The present invention mixes (premixes) gas fuel and combustion air supplied to a premixed gas burner which is widely used for a gas combustion device, so that complete combustion occurs when the mixed fuel gas is burned in the gas burner. By maximizing the thermal efficiency of the boiler and at the same time to minimize the generation of harmful gases generated during combustion, a plurality of nozzles formed in the circumferential direction of the gas fuel supply port and the inner body for supplying fuel to one side of the outer body Formed to form a gaseous fuel at the same pressure to both the inner side of the outer body. Forming a first chamber and a second chamber for ejecting, forming a small gap connecting the first chamber and the second chamber, and allowing combustion air and gaseous fuel to be constantly mixed into the inner body; It is a micro pre-mixing device for high-load gas fuel combustion of a gas boiler, characterized in that formed in the venturi portion.

Description

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

1 is a longitudinal sectional view in a state where a main part is incised.

2 is a longitudinal cross-sectional view of the present invention.

3 is an installation state diagram of the present invention.

* Explanation of symbols for main parts of the drawings

1: outer body 1a: first chamber

1b: 2nd chamber 1c: protrusion

2: gas fuel supply port 3: inner body

3a, 3b: nozzle 3d: venturi part

The present invention is an ultra-preliminary premixing apparatus for the combustion of gas boilers of high-load gas fuel, and more specifically, pre-mixing the gas fuel and the combustion air supplied to the gas mixture of the premixing method widely used for gas combustion equipment (premixing). It is to minimize the generation of harmful gases generated during combustion while maximizing the thermal efficiency of the boiler by making the complete combustion when the mixed fuel gas is burned in the gas burner.

In general, most gas burners, which are widely used in gas combustion equipment such as domestic gas boilers, have a semi-bunsen gas burner, which has advantages such as low flame stability and low risk of flame backfire. This semi-bunsen gas burner is used as a combustion exhaust gas because the flame length of the burner is structurally long and the actual amount of combustion air required for combustion requires much more air than the theoretical air amount. Due to the large amount of loss and emission of pollutants such as NOx, CO, etc., the direction in which the gas burner is attached to the gas burner such as gas boilers is limited to the bottom-up, thus improving and maximizing the efficiency of the gas burner. There was a problem in that there was some limitation in making.

In addition, as a premixer that premixes combustion air and gaseous fuel before combustion, the Venturi type premixer is mainly used. However, the Venturi type premixer has a disadvantage in that its structure is large and complicated. In the premixer used in the equipment, that is, a gas fuel nozzle and a plurality of swirlers are installed in the center of the combustion air hole, the mixing ratio of the combustion air and the gas fuel is increased to the entire burner as the gas fuel nozzle is biased. Not only does not form uniformly, there are disadvantages such as a large pressure loss due to the use of a swirler (Swirler).

Accordingly, the present invention has been made to solve the above-mentioned problems, the present invention is a pneumatic pressure when pre-mixing the gas fuel and the combustion air supplied to the gas mixture of the pre-mixing method widely used for small gas combustion equipment In order to prevent incomplete combustion due to fluctuations in the amount of combustion air due to disturbances such as fluctuations of the gas, a venturi-shaped inner body is formed to keep the mixing ratio of the combustion air and the gas fuel constant during mixing. High-combustion type gas fuel combustion for gas boilers, which maximizes the thermal efficiency of the boiler and minimizes the generation of harmful gases generated during combustion by allowing complete combustion when the mixed fuel gas is burned in the gas burner. The purpose is to provide a premixing device.

According to the form of the present invention for achieving the above object, it is formed by a gas fuel supply port for supplying fuel to one side of the outer body and a plurality of nozzles formed in the circumferential direction of the inner body, the gas to both inner sides of the outer body Form fuel at the same pressure. A first chamber and a second chamber for ejecting are formed, and a small gap connecting the first chamber and the second chamber is formed, and the venturi is uniformly mixed with the combustion air into the inner body. It is a compact premixing device for combustion of small, high-load gas fuel formed in the form.

With reference to the drawings 1 to 3 attached to an embodiment of the present invention having the above objects and features will be described in detail the configuration and effect.

In recent years, the combustion surface of gas burners attached to gas combustion devices such as gas boilers can be burned at high loads per unit area by using a porous plate made of ceramics, stainless steel, or metal fiber woven fabrics with high durability and corrosion resistance. Due to the short design, it is possible to design with a very compact structure and to improve thermal efficiency due to the high load combustion. Therefore, the gas burner surface is replaced with a porous plate made of ceramic, stainless steel or metal fiber, which has high durability and corrosion resistance. The mixing device formed on the pre-mixed gas burner which receives the mixed fuel gas and burns it on the combustion surface of the burner after completely mixing (premixing) the gas fuel in advance before burning the gas to burn the pre-mixed fuel gas. Burners have shorter, smaller flame lengths Since the combustion performance is improved only by the amount of air, the amount of loss due to the exhaust gas is small and the amount of pollution emission such as NOx, CO, etc. is small, and the direction in which the burner is installed in the gas combustion device can be installed vertically or downwardly. It is possible to reduce the exhaust gas temperature and to form a structure that can absorb the latent heat of condensate generated by reducing the exhaust gas temperature by using a corrosion resistant material that can withstand low temperature corrosion. The present invention for maximizing the gas boiler efficiency, as shown in Figure 1, a plurality of gas fuel supply port 2 and the inner body 3 formed in the circumferential direction for supplying fuel to one side of the outer body (1) Forming three nozzles (3a, 3b), at the same pressure on both sides of the outer body (1). A first chamber 1a and a second chamber 1b for ejecting are formed, and a small gap 1c connecting the first chamber 1a and the second chamber 1b is formed and the inner body 3 Is formed of a venturi portion 3d for uniformly mixing fuel and air into the inside.

The operation of the present invention described above is as follows.

The gas fuel supplied through the gas fuel supply port 2 is uniformly filled in the circumferential direction in the first chamber 1a and stabilized, and then passes through the gap to refill the second chamber 1b. When the gas fuel is ejected from the nozzles 3a and 3b bored at a constant distance in the circumferential direction of the inner body 3 while forming the same pressure in the circumferential direction, the combustion air is disturbed inside the inner body 3. Due to the change in air pressure or air volume, the combustion air supply is not constant and the effect of the gas fuel ejected from the nozzles 3a and 3b when there is shaking is reduced and at the same time the venturi part 3d, Since the gas fuel supplied from the nozzles 3a and 3b is changed to the air negative pressure generated from the flow of air, the mixing ratio of the gas fuel and the combustion air is always kept constant. Is burning flows to the burner inside the boiler.

Therefore, the present invention is formed to have a structure that is small in size and low in pressure drop and loss compared to the premixer of the gas burner used so far, and in case the combustion air and the gas fuel flow to one side, partially As the equivalence ratio is changed, the flame on the burner combustion surface is biased, and the burner's combustion performance is worsened. Therefore, the flame length of the burner is as short as possible, and the mixed fuel gas is biased in the flow even in a small space. Venturi-type internal body is formed so that gas fuel and combustion air are completely mixed to minimize the generation of harmful gases during combustion, thereby maximizing the thermal efficiency of the gas boiler, and making the burner easy to manufacture and It is very useful and practical because it also considers convenience. It is an invention.

Claims (1)

It is formed of a gas fuel supply port (2) for supplying fuel to one side of the outer body (1) and a plurality of nozzles (3a, 3b) formed in the circumferential direction of the inner body (3), of the outer body (1) Gas fuel is formed at the same pressure on both sides. The first chamber 1a and the second chamber 1b for ejecting are formed, and a small gap 1c connecting the first chamber 1a and the second chamber 1b is formed, and the inner body 3 Small preloading apparatus for small and high load gas fuel combustion, characterized in that the bent portion (3d) is formed so that the combustion air and the gas fuel is constantly mixed into the inside.