CN206398711U - A kind of low-nitrogen discharged burner - Google Patents

Abstract

The utility model discloses a low-nitrogen emission burner, which comprises a burner body and a plurality of combustion holes arranged on the burner body. One end of the heat collection branch pipe is connected with a heat collection water inlet pipe, and the other end of the heat collection branch pipe is connected with a heat collection water outlet pipe. The utility model uses the heat collecting branch pipe to absorb the heat generated by the combustion of the burner, thereby reducing the combustion temperature of the entire burner, realizing low nitrogen emission, reducing energy consumption, and being green and environmentally friendly; it solves the high emission of nitrogen oxides in conventional products of the existing burner , Low-nitrogen emission products have complex technology, difficult processing and manufacturing, and high cost, making gas water heaters safer, more environmentally friendly, and easier to promote.

Description

A low nitrogen emission burner

technical field

The utility model relates to the technical field of burners for gas water heaters, in particular to a low nitrogen emission burner.

Background technique

At present, the methods of reducing nitrogen oxides in gas water heaters are full premixed combustion, thick and thin combustion, arranging cooling bodies in the flame and humidifying the combustion chamber, etc. The basic starting point is to change the structure of the burner to reduce the amount of nitrogen oxides produced and achieve low nitrogen emissions. the goal of.

1) Fully premixed combustion reduces the residence time of the combustible mixture in the high temperature zone of the flame, that is, the reaction time, but when it is applied to household gas water heaters, it has disadvantages such as complex detection and control, unstable combustion, and great safety hazards.

2) The purpose of thick-lean combustion is to delay burnout and reduce the temperature in high-temperature areas. The technology is relatively complicated, the design and manufacture of burners are difficult, the cost is high, and there are few domestic applications.

3) The purpose of arranging the cooling body in the flame is to reduce the temperature in the high-temperature zone, but the cooling body will lead to an increase in CO content, and it is necessary to strengthen the mixing of gas and air in the later stage, which requires high technical requirements and is difficult to manufacture the burner.

4) The purpose of humidification in the combustion chamber is to reduce the temperature in the high-temperature zone, but it will lead to a significant reduction in thermal efficiency and cannot be avoided.

Low nitrogen emission burners are rarely used in China, so the domestic gas water heater market is dominated by conventional products. Most of the low-nitrogen emission gas water heaters on the market are mainly foreign products such as Europe, America, Japan and South Korea. Their prices are relatively high and it is difficult to popularize them.

Contents of the invention

Aiming at the problems existing in the prior art, the purpose of the utility model is to provide a low-nitrogen emission burner with high thermal efficiency.

In order to achieve the above object, the utility model adopts the following technical solutions.

A low-nitrogen emission burner, comprising a burner body and a number of combustion holes arranged on the burner body, characterized in that a heat collecting branch pipe is arranged in the gap between adjacent combustion holes, and one end of the heat collecting branch pipe is connected with The heat-collecting water inlet pipe and the other end of the heat-collecting branch pipe are connected with a heat-collecting water outlet pipe.

As an improvement, the combustion holes are arranged in several rows, the heat collecting branch pipes include several straight pipes arranged side by side between two adjacent rows of combustion holes, and the heat collecting water inlet pipe and the heat collecting water outlet pipe are respectively arranged in the burner body on both sides.

As an improvement, heat collecting fins are also provided on the heat collecting branch pipe.

As an improvement, the heat collecting fins are placed on the head of the burner and are not in contact with the flame.

As an improvement, the low-nitrogen burner is installed on the gas water heater, the heat collecting water inlet pipe is connected to the cold water inlet pipe of the gas water heater, and the heat collecting water outlet pipe is connected to the heat exchanger coil of the gas water heater.

The beneficial effects of the utility model are:

1. Use the heat collecting branch pipe to absorb the heat generated by the combustion of the burner, thereby reducing the combustion temperature of the entire burner, realizing low nitrogen emissions, reducing energy consumption, and being green and environmentally friendly; it solves the problem of high emissions of nitrogen oxides in conventional products of existing burners. Low-nitrogen emission products have complicated technology, difficult processing and manufacturing, and high cost, making gas water heaters safer, more environmentally friendly, and easier to promote.

2. Since the heat collecting branch pipe absorbs the heat discharged downward from the burner, when it is applied to a gas water heater, the waste heat can be utilized, and the overall efficiency of the gas water heater is improved to a certain extent.

Description of drawings

Fig. 1 is a schematic structural diagram of the low nitrogen emission burner provided by the utility model.

Figure 2 is a schematic diagram of the application of the low nitrogen emission burner provided by the present invention.

Explanation of reference signs:

1: Burning hole, 2: Heat collecting branch pipe, 3: Heat collecting water inlet pipe, 4: Heat collecting water outlet pipe, 5: Heat collecting sheet, 6: Cold water inlet pipe, 7: Heat exchanger coil, 8: Heat exchanger , 9: Outlet hot water pipe, 10: Burner body.

detailed description

In order to facilitate those skilled in the art to better understand the essence of the utility model, the specific implementation of the utility model will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, a low-nitrogen emission burner includes a burner body 10 and a number of combustion holes 1 arranged on the burner body 10. One end of the heat collecting branch pipe 2 is connected with a heat collecting water inlet pipe 3 , and the other end of the heat collecting branch pipe 2 is connected with a heat collecting water outlet pipe 4 .

Wherein, the combustion holes 1 are arranged in several rows, the heat collecting branch pipes 2 include several straight pipes arranged side by side between two adjacent rows, and the heat collecting water inlet pipe 3 and the heat collecting water outlet pipe 4 are arranged at the burner respectively. sides.

Further, heat collecting fins 5 are also provided on the heat collecting branch pipe 2, and the heat collecting fins 5 are placed on the head of the burner without contacting the flame, so as to improve the heat collecting effect and avoid the increase of CO emission.

As shown in FIG. 2 , in actual application, the heat collecting water inlet pipe 3 is connected to the cold water inlet pipe 6 of the gas water heater, and the heat collecting water outlet pipe 4 is connected to the heat exchanger coil 7 of the gas water heater. When the gas water heater is working, after the cold water enters through the cold water inlet pipe 6, part of it flows to the heat exchanger coil 7, and the other part flows to the heat collection water inlet pipe 3; The heat collecting outlet pipe 4 converges and flows to the heat exchanger coil 7, during which the heat collecting sheet 5 absorbs the heat in the combustion chamber and transfers it to the heat collecting branch pipe 2 to heat up the cold water, and the warm water entering the heat exchanger coil 7 flows into the heat exchanger 8. Complete the heat exchange and flow out from the hot water outlet pipe 9.

Existing studies have shown that there are three forms of nitrogen oxides generated during gas combustion: thermal nitrogen oxides, instantaneous reaction nitrogen oxides, and fuel nitrogen oxides. Among them, thermal nitrogen oxides account for the largest share. Thermal nitrogen oxides are produced during combustion, mainly NO, which is produced by oxidation of nitrogen at high temperature. There are 6 chemical reaction processes, 4 of which have relatively little impact, and the 2 main reaction processes are as follows:

N ₂ +O<——>NO+N 1)

N+O ₂ <——>NO+O 2)

These two reaction processes are endothermic reactions, so the formation rate of NO is most affected by the combustion temperature. It begins to form above 1500°C, and the higher the temperature, the more NO is produced. When the temperature dropped to 1200 °C, the amount of NO production decreased significantly. The further oxidation of NO to NO ₂ is carried out under the condition of low temperature, so NO ₂ is mostly generated after NO is discharged into the atmosphere with flue gas.

In the low-nitrogen emission burner provided in this embodiment, by setting heat collecting branch pipes and heat collecting fins between adjacent combustion holes, since the heat collecting fins absorb the heat in the combustion chamber, the average combustion temperature is reduced, effectively reducing heat The formation of nitrogen oxides, thereby reducing the overall content of nitrogen oxides in the flue gas.

According to the thermal efficiency formula of the gas water heater: η=1-a-b-c.

Where η—water heater efficiency, %.

a—exhaust smoke loss, %.

b—incomplete combustion loss, %.

c—heat dissipation loss, %.

Conventional gas water heater heat dissipation loss is about 2.5%. In the low-nitrogen emission burner provided in this embodiment, the heat absorbed by the heat collecting tube includes the dissipated and unused heat of the combustion chamber, and this part of the heat is used to heat the cold water, which is equivalent to reducing the value of c, so in a certain To a certain extent, the efficiency of the whole machine can also be improved.

The above specific embodiments have described the essence of the utility model in detail, but the protection scope of the utility model cannot be limited by this. Obviously, under the enlightenment of the essence of the utility model, those skilled in the art can also make many improvements and modifications, for example, a horizontal burner or a vertical burner can be selected in the type selection of the burner body. It should be noted that these improvements and modifications all fall within the protection scope of the claims of the present invention.

Claims (6)

1. A low-nitrogen emission burner, comprising a burner body, a number of combustion holes arranged on the burner body, characterized in that, a heat collecting branch pipe is provided in the gap between adjacent combustion holes, and one end of the heat collecting branch pipe It is connected with a heat collecting water inlet pipe, and the other end of the heat collecting branch pipe is connected with a heat collecting water outlet pipe. 2. A low-nitrogen emission burner according to claim 1, wherein the combustion holes are arranged in several rows, and the heat-collecting branch pipes include several straight tubes arranged side by side between two adjacent rows of combustion holes. The heat collecting water inlet pipe and the heat collecting water outlet pipe are respectively arranged on both sides of the burner body. 3. A low-nitrogen emission burner according to claim 1, characterized in that, heat collecting fins are also provided on the heat collecting branch pipe. 4. A low-nitrogen emission burner according to claim 3, characterized in that the heat collecting fins are placed at the head of the burner and are not in contact with the flame. 5. A low-nitrogen emission burner according to claim 1, characterized in that it is installed on the gas water heater, the heat collecting water inlet pipe is connected with the cold water inlet pipe of the gas water heater, and the heat collecting outlet pipe is connected with the heat of the gas water heater. Exchange coil connections. 6. A low nitrogen emission burner according to claim 1, characterized in that the burner body is a horizontal burner or a vertical burner.