JP2007170809A - Thick and thin fuel combustion burner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively reduce volume of a thick and thin fuel combustion burner, to adapt it to a gas cooking stove or a gas water heater for domestic purpose, to reduce fouling of gas exhaust, and to stabilize combustion. <P>SOLUTION: A thick fuel fire grating 20 and a thin fuel fire grating 30 are vertically arranged, and thick and thin fuel burner ports 211, 311 are arranged in a zigzag form. By supplying mixed gas from a thick fuel fire grating gas pipe 22, and mixed gas from a thin fuel fire grating gas pipe 32 through air supply pipes 21, 31 respectively to form thick and thin fuel combustion, a combustion state is composed of the thick and thin fuel combustion of the burner ports 211, 311 adjacent to each other. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a burner, and relates to a light and dark combustion burner that is applied to a small combustion system such as a household gas stove and a hot water heater, and particularly to a downsized combustion system.

The concentration combustion design effectively reduces the emission rate of nitric oxide (NO) and carbon monoxide (CO), so it can be said to be the most environmentally friendly combustion method. The light and dark burner often used for academic purposes is the Wolfhard-Parker slot burner used by Shu of the University of Illinois in the United States.
flame), and this part of the premixed flame has two premixed reaction zones, one of which is a fuel-lean combustion zone and the other In other words, a non-premixed combustion (or diffusion flame) region can be formed by a fuel-rich combustion region. These three zones are called triple flames because they touch at triple points. Among them, the non-premixed flame combustion zone burns diffusion flames at a stoichiometric mixing ratio by mixing excess fuel from the rich fuel flow zone and oxygen mixing in the high and low mixing rate combustion zones. Triple flames in combustion theory, for example, flame stabilization (in other words, increasing the stable combustion range), avoiding liftoff flame, increasing turbulent mixture and releasing heat It plays a very important role in phenomena such as (heat release). Heat release also affects the flow dilatation and buoyancy effect of the combustion gas, and the triple flame is reignitioned when the burner area is locally extinction. There is a special point. Considering the methane gas concentration burn, the rich fuel combustion zone generates CO and H ₂ . The low mixing ratio combustion zone is the main place where the methane gas is consumed, and the back diffusion combustion zone is the place where it mainly oxidizes with intermediate products such as CO and H ₂ to form CO ₂ and H ₂ O .

  However, the lean burner generally requires a thick fuel mixing tube and a lean fuel mixing tube, and the lean state is a mixture of rich fuel or a mixture of lean fuel using a plurality of small honeycomb holes. Form a state. Therefore, it is difficult to apply to a small-sized consumer burner such as a gas stove or a water heater, such as an arrangement space of a pipeline for supplying the fuel or a control mechanism for the fuel air ratio. The design of household gas water heaters that have been commercialized so far is a common design, as shown in FIG. 10, and a mixed gas (air + combustion gas) is mixed using a forced air blowing method. Enter from the entrance 71. Further, as shown in FIG. 11, in the state of lean combustion, the mixed gas is divided into a lean grate mixed gas and a thick grate mixed gas, and the lean grate mixed gas inlet 72 and the rich grate mixed gas are respectively separated. It enters from the inlet 73 and is discharged from the top surface to burn. The above design is intended to form a so-called light and dark combustion by providing the discharge of the gas mixture of the dense grate where the lean grate is arranged in a strip and the gap of the dilute grate is dense. However, in practice, it is not practical because it cannot always be maintained in a light and dark combustion state as in an ideal state.

  An object of the present invention is to provide a light and dark combustion burner that can be applied to a small-sized consumer burner, for example, a gas stove, a water heater, and the like, and can meet environmental demands.

The lean burner disclosed in the present invention includes a lean grate and a thick grate, and the dense grate is composed of a plurality of parallel mixed gas supply pipes, and each of the supply pipes has a plurality of flame holes. The lean grate is similarly composed of a plurality of parallel mixed gas supply pipes, and each of the supply pipes has a plurality of flame holes and a supply amount (ie, combustion gas). Is formed larger than the supply amount of the dense grate. Then, the flame holes of the lean grate and the flame holes of the dense grate are arranged in a zigzag manner in a matrix manner (enclosed arrangement), and the flame holes adjacent to each other are formed to make the combustion state of the light and dark combustion. In this way, when applied to small consumer burners, such as gas stoves and water heaters, it is possible to effectively reduce nitrogen monoxide (NO) and carbon monoxide (CO), so that general household gas stoves and water heaters can be used. The container can be matched to the conditions required for more environmental protection.

    Hereinafter, detailed contents and techniques of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the light and dark combustion burner disclosed in the present invention is mainly composed of a dense flame flame hole 11 and a lean flame flame hole 12 arranged in a zigzag manner in a matrix manner and adjacent to each other. It is possible to apply to small-sized consumer burners such as gas stoves and hot water heaters, etc. it can.

  In order to achieve the purpose of concentration burning of each independent flame hole, reference is first made to an embodiment of a household gas stove as shown in FIG. The dense grate 20 can be designed as a lateral upper air supply passage having a small cross section, and can incorporate a smaller amount of primary air in the vicinity of the tapered passage in accordance with the inlet of the gas pipe to form a denser gas amount. . In addition, a plurality of parallel gas supply pipes 21 are provided, and each of the air supply pipes 21 is provided with a plurality of flame holes 211. As shown in FIG. 3, the lean grate 30 is designed as a lateral lower air supply passage having a large cross section and incorporates a lean gas amount consisting of a large amount of primary air in the vicinity of the tapered passage. The plurality of gas supply pipes 31 are arranged in parallel with each other, and each of the air supply pipes 31 is provided with a plurality of flame holes 311. Since the upper air supply passage of the dense grate 20 and the lower air supply passage of the lean grate 30 are designed in a zigzag shape, as shown in FIG. A flame hole can be constructed. The dark grate 20 is located above the lean grate 30.

  As described above, the dense fuel mixing state of the dense grate 20 is designed so that a larger cross-sectional area, or a tapered tube at the front end of the mixing tube and a nozzle at the end of the gas tube, are designed to increase the amount of air due to the Venturi effect. The quantity can be taken to achieve the fuel and air mix required for rich combustion, and such a combustion condition is a partially premixed flame. Moreover, the control of the air fuel ratio can be achieved by adjusting the primary air amount by combining the stopper of the primary air at the leading edge inlet of the tapered tube that is commonly used.

  The lean fuel mixing state of the lean grate 30 is necessary for dense combustion by introducing a small amount of air due to the Venturi pipe effect by designing a nozzle at the end of the narrow pipe or gas pipe at the front end of the mixing pipe Therefore, it is possible to achieve a control of the air fuel ratio by adjusting the primary air amount in accordance with the stopper of the primary air at the leading edge inlet of the commonly used tapered tube. In addition, the gas pipe is used to join directly to the narrow grate tapered inlet, and the dense grate mixing pipe is completely filled with gas fuel, and the fuel is mixed with the external air outside the grate nozzle. Combustion is then performed, and such a combustion state is referred to as a diffusion flame.

As shown in FIG. 4, the dense grate gas tube 22 (or dilute grate gas tube 32) inlets designed for the dark grate 20 (or lean grate 30) are both designed on the same side and facing each other. You can design a fixed support on the other side. Furthermore, as shown in FIG. 5B, the zigzag arrangement method of the dense grate 20 and the lean grate 30 can be simplified to the arrangement of the internal pipeline of the gas stove pipeline, and the primary air arranged inside the gas stove enters. Space becomes easy to arrange. Further, all of the flame holes 211, 311 are avoided from the honeycomb flame hole outlet separator 40 (shown in FIG. 5A) at the top of the burner at any position. The separator plate 40 having a plurality of cross nets can fix the position of the light and shade grate and improve the state of the light and dark combustion of each flame hole 11 and 12. Both of the designed flame holes 11 and 12 of the light and shade grate are located at the mesh center of the mesh separator 40.

  As shown in FIGS. 6A, 6B, 6C, 6D, 6E, and 6F, the dense grate 20 and the dilute grate 30 utilize tapered ports 212 and 312 of different sizes, and the mixed gas passage of the dense grate 20 Is designed to be narrower than the lean grate 30, and the fuel, that is, the gas amount of the dense grate 20 is less than that of the lean grate 30, or the mixed gas amount of the dense grate 20 (the amount of primary air is small) of the lean grate 30. The cross-sectional area of the dense grate 20 is smaller than the lean grate 30 because it is less than the mixed gas (the amount of primary air is large). In addition, since the bottom part of a gas stove must consider the taking-in space of secondary air, the design of the area of the thick grate 20 and the lean grate 30 is the same. However, the thickness of the thick grate 20 is smaller than that of the lean grate 30, increasing the secondary air intake space and allowing the secondary air to pass therethrough, thereby providing more passages. That is, the thick grate 20 and the lean grate 30 minimize the area that prevents the intake of secondary air.

  Further, the dense grate 20 and the lean grate 30 are arranged in a zigzag, and the small mixed gas passage of the dense grate 20 is combined to design the upper part of the dense grate 20, and the mixed gas of the lean grate 30 is large. The passage is designed in the lower part of the lean grate 30, thereby effectively shifting the mixed gas passage of the dense grate 20 and the lean grate 30. On the other hand, in addition to the embodiment described above, the distribution positions of the flame holes 211 and 311 can also be changed depending on the manner of the household gas stove. In other words, as shown in FIG. The design of the flare hole is submitted, the light and dark burner is downsized and can be applied to a household burner, and the distribution of the flame hole is not limited.

  As shown in FIG. 8, the above-described embodiment belongs to the natural air supply type dense grate 20 and the dilute grate 30. Therefore, when the primary air is introduced using the Venturi pipe effect, the primary air is used. The quantity cannot be achieved theoretically or in practice with a stoichiometric amount of combustion air. Therefore, in a situation where either the dense grate 20 or the lean grate 30 is in a natural supply state, the amount of air in the pipe where gas and air are mixed does not reach the state of combustion, that is, burns with the rich fuel. Become. For this reason, in the situation of natural air supply, the amount of air in the dense grate 20 is controlled or achieved smaller than the amount of air in the lean grate 30, whether it is the dense grate 20 or the lean grate 30; Since the air / fuel ratio (ratio of air to fuel) is insufficient, combustion cannot be performed unless secondary air in the surrounding environment is supplemented. Complementing the shortage of air amount, the air amount of the combustion gas of the lean grate 30 can reach the combustion condition of the theoretical mixing ratio by the forced air blowing method, and the combustion state of the lean fuel can be controlled.

  As shown in FIG. 8, the fan 50 can provide the primary air for the dense grate 20 and the lean grate 30 as well as the amount of secondary air that fills other areas of the burner. However, since the dense grate 20 and the lean grate 30 are arranged in a zigzag shape, the fan 50 directly provides the air in the mixing tube to the dense grate 20 and the lean grate 30 by the side air supply method. And there is no other blocking member.

On the other hand, as an example applied to a domestic water heater, as shown in FIG. 9, the arrangement of the burner space of a conventional water heater is rectangular, and is different from a round gas stove, so the entire combustion area is rectangular. In addition, the dense grate 20 and the lean grate 30 at the bottom of the burner are arranged in a zigzag manner so that the dense combustion flame holes 211 and the lean combustion flame holes 311 are adjacent to each other. In the flame holes at the upper part of the burner, for example, the outlets adjacent to each other in the outlet separators 40 arranged in a honeycomb shape can be realized in a combustion state of light and dark combustion. The arrangement of the dense grate 20 and the lean grate 30 and the detailed structure are the same as the concrete means of the primary air incorporated in the dense grate 20 or the dilute grate 30 of the realized light and dark combustion and the water heater. I will not explain it again. And since it is obstructed by the arrangement of the water heaters, it is ideal to blow air from the bottom when adding more fans.

  As described above, the present invention discloses the above preferred embodiment. However, this is not intended to limit the present invention, and to be within the technical scope of the present invention, such as changes or decorations made on the premise that any person skilled in the art does not depart from the spirit or scope of the present invention. Therefore, the protection scope of the present invention is equivalent to that defined in the claims below.

The top view of the light and dark combustion burner of this invention. The top view of the dark grate of the light and dark combustion burner of this invention. The top view of the dilute grate of the light and dark combustion burner of this invention. The top view of the dark grate of a light-and-burn combustion burner of the present invention, and a dilute grate. The top view of the separator of the light and dark burner of this invention. The top view of the household gas stove of the light and dark combustion burner of this invention. FIG. 3 is a detailed sketch of a dark grate and a dilute grate of the light and dark combustion burner of the present invention. FIG. 3 is a detailed sketch of a dark grate and a dilute grate of the light and dark combustion burner of the present invention. FIG. 3 is a detailed sketch of a dark grate and a dilute grate of the light and dark combustion burner of the present invention. FIG. 3 is a detailed sketch of a dark grate and a dilute grate of the light and dark combustion burner of the present invention. FIG. 3 is a detailed sketch of a dark grate and a dilute grate of the light and dark combustion burner of the present invention. FIG. 3 is a detailed sketch of a dark grate and a dilute grate of the light and dark combustion burner of the present invention. The sketch of the other embodiment of the household gas stove of the light and dark combustion burner of this invention. The sketch which the household gas stove of the light and darkness burner of this invention couple | bonds a fan. The sketch of the water heater of the light and dark combustion burner of this invention. A sketch of a conventional gas water heater. A sketch of a conventional gas water heater.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Thick flame, 12 ... Lean flame, 20 ... Thick grate, 21 ... Supply pipe, 211 ... Flame hole, 212 ... Tapered mouth, 22 ... Thick grate gas pipe, 30 ... Lean grate, 31 ... Supply pipe, 311 Flame hole, 312 taper, 32 ... lean grate gas tube, 40 ... separator, 50 ... fan, 71 ... mixed gas inlet, 72 ... lean grate mixed gas inlet, 73 ... rich grate mixed gas inlet.

Claims (7)

In light and dark combustion burners applied to household gas stoves and water heaters,
A thick grate with multiple flame holes,
A plurality of flame holes, the amount of air supply includes a lean grate greater than the amount of air supply of the dense grate,
The lean holes of the lean grate and the flame holes of the dark grate are arranged in a zigzag manner in a matrix manner, and constitute a combustion state of the light and dark combustion of the flame holes adjacent to each other. Burning burner.   2. The light and dark combustion burner according to claim 1, wherein the dense grate is composed of a plurality of parallel mixed gas supply pipes, and each of the supply pipes is provided with a plurality of flame holes.   3. The light and dark combustion burner according to claim 2, wherein the dense grate includes a gas pipe of a denser grate and is used for supplying the burner in communication with the supply pipe.   The lean burner according to claim 1, wherein the lean grate is composed of a plurality of parallel mixed gas supply pipes, and each of the supply pipes is provided with a plurality of flame holes.   The lean burner according to claim 4, wherein the lean grate includes a gas pipe of a denser grate and is used for supplying the burner in communication with the supply pipe.   The light and dark combustion burner according to claim 1, wherein the dense grate is positioned above the lean grate. The concentration burner according to claim 1, further comprising a fan for improving the air supply amount of the burner.