Ultra-low NOx emission gas burner with replaceable nozzle

Abstract

The utility model relates to the technical field of combustors, in particular to an ultralow NOx emission gas combustor with a replaceable nozzle, which comprises a combustion-supporting air sleeve, one side of the top end of the combustion-supporting air sleeve is connected with a first grading gas inlet pipeline assembly, one side of the bottom end of the combustion-supporting air sleeve is connected with a second grading gas inlet pipeline assembly, and the other side of the bottom end of the combustion-supporting air sleeve is connected with a second grading gas inlet pipeline assembly. The bottom end of the second grading gas inlet pipeline assembly is connected with a combustion-supporting air inlet pipeline, a main gas inlet pipeline is installed in the middle of the interior of the combustion-supporting air sleeve, a cavity is formed in the middle of the combustion-supporting air sleeve, a main gas nozzle is independently installed in the cavity, and the main gas inlet pipeline is detachably connected with the main gas nozzle. And the main gas nozzle controls the distribution of the air quantity by adjusting the resistance coefficient. According to the ultra-low NOx emission gas burner with the replaceable nozzle, fuel grading, air grading and other combustion technologies are utilized, efficient combustion of gas is effectively achieved, and it is guaranteed that the burner can achieve ultra-low emission of nitric oxide under different working conditions.

Description

Technical Field

[0001] The utility model relates to the technical field of burners, in particular to an ultra-low NOx emission gas burner with replaceable nozzles. Background Art

[0002] With the gradual optimization of the global energy structure and the implementation of the "carbon peak and carbon neutrality" policy, my country's control over coal fuels has become increasingly stringent. As one of the clean fuels with low pollutant emissions, natural gas's efficient combustion and low NOx emissions are key performance indicators.

[0003] At present, most of the gas burners used in the domestic market are imported products. Imported gas burners have lower NOx emission levels and higher combustion efficiency, and their market share is relatively high. In places where gas burners are used on a large scale, such as oil fields, the investment cost is huge; in addition, if imported products are returned to the factory for repair, there are problems such as long overseas operation cycles, which have a certain impact on the use of the product. Therefore, in view of the above shortcomings, an ultra-low NOx emission gas burner with replaceable nozzles is proposed. Summary of the invention

[0004] The purpose of the utility model is to provide an ultra-low NOx emission gas burner with a replaceable nozzle, so as to overcome the problem that the gas burners in the prior art cannot achieve ultra-low emissions of nitrogen oxides under different operating conditions, and that most gas burners on the market have excessively high NOx emissions under low-load operating conditions.

[0005] In order to achieve the above object, the utility model provides an ultra-low NOx emission gas burner with replaceable nozzle, comprising:

[0006] A combustion-supporting air sleeve, one side of the top end of the combustion-supporting air sleeve is connected to a first staged gas intake pipeline assembly, one side of the bottom end of the combustion-supporting air sleeve is connected to a second staged gas intake pipeline assembly, combustion-supporting air is introduced into both the first staged gas intake pipeline assembly and the second staged gas intake pipeline assembly, the bottom end of the second staged gas intake pipeline assembly is connected to the combustion-supporting air intake pipeline, a main gas intake pipeline is installed in the middle of the combustion-supporting air sleeve, main gas is introduced into the main gas intake pipeline, a cavity is provided in the middle of the combustion-supporting air sleeve, a main gas nozzle is independently installed in the cavity, the installation position of the main gas nozzle is adjusted by sliding, and the main gas intake pipeline is detachably connected to the main gas nozzle.

[0007] Preferably, the first staged gas intake pipeline assembly and the second staged gas intake pipeline assembly are compatible with each other.

[0008] Preferably, the first staged gas intake pipeline assembly includes a staged gas intake pipeline, a dispersed gas pipeline, a staged gas nozzle and a flue gas-gas mixing pipe, the tail end of the staged gas intake pipeline is connected to the dispersed gas pipeline, the tail end of the dispersed gas pipeline is connected to the staged gas nozzle, and the other side of the staged gas nozzle is connected to the flue gas-gas mixing pipe.

[0009] Preferably, elliptical suction ports are respectively provided on both sides of the graded gas nozzle.

[0010] Preferably, the bottom end of the staged gas intake pipeline of the second staged gas intake pipeline assembly is connected to the combustion-supporting air intake pipeline.

[0011] Preferably, the main gas nozzle comprises a main gas nozzle body, swirl blades and a bolt connection interface, a connection hole is provided at the center of the head end of the main gas nozzle body, the main gas nozzle body is inserted into the installation bolt connection interface through the connection hole, and swirl blades are installed on both sides of the outside of the bolt connection interface.

[0012] Preferably, the tail end of the main gas inlet pipeline is connected to the main gas nozzle via a bolt connection interface.

[0013] Preferably, the inner diameter of the main gas intake pipeline is larger than the outer diameter of the bolt connection interface.

[0014] Preferably, a circular hole is provided at the center of the front end of the combustion-supporting air sleeve, ventilation holes are provided at the top and bottom ends of the combustion-supporting air sleeve respectively, a channel is provided inside the combustion-supporting air sleeve, the circular hole is connected to the channel, and the channel is connected to the cavity.

[0015] Preferably, a main gas intake pipeline is installed inside the channel, and a circular hole is passed through the head end of the main gas intake pipeline.

[0016] The utility model provides a replaceable nozzle ultra-low NOx emission gas burner, which utilizes combustion technologies such as fuel staging and air staging, and is provided with a main gas intake pipeline and a staged gas intake pipeline assembly, which not only effectively realizes efficient combustion of gas, but also ensures that the burner can achieve ultra-low emissions of nitrogen oxides under different operating conditions, thereby solving the problem of excessive NOx emissions from most gas burners on the market under low-load operating conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of an ultra-low NOx emission gas burner with replaceable nozzle according to an embodiment of the utility model.

[0018] Legend:

[0019] 1- Main gas inlet pipeline; 2- Bolt connection interface; 3- Main gas nozzle; 4- Combustion air inlet pipeline; 5- Staged gas inlet pipeline; 6- Dispersed gas pipeline; 7- Combustion air sleeve; 8- Staged gas nozzle; 9- Flue gas and gas mixing pipe; 10- Swirl blade; 11- Elliptical suction hole. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Figure 1 Schematic diagram of the structure of the ultra-low NOx emission gas burner with replaceable nozzle according to the utility model. Figure 1 As shown, the utility model provides an ultra-low NOx emission gas burner with replaceable nozzle, comprising:

[0022] A combustion-supporting air sleeve 7, one side of the top end of the combustion-supporting air sleeve 7 is connected to a first graded gas intake pipeline assembly, one side of the bottom end of the combustion-supporting air sleeve 7 is connected to a second graded gas intake pipeline assembly, combustion-supporting air is introduced into both the first graded gas intake pipeline assembly and the second graded gas intake pipeline assembly, the bottom end of the second graded gas intake pipeline assembly is connected to a combustion-supporting air intake pipeline 4, a main gas intake pipeline 1 is installed in the middle of the combustion-supporting air sleeve 7, main gas is introduced into the main gas intake pipeline 1, a cavity is provided in the middle of the combustion-supporting air sleeve 7, a main gas nozzle 3 is independently installed in the cavity, the main gas nozzle 3 can adjust the installation position by sliding, and the main gas intake pipeline 1 can be detachably connected to the main gas nozzle 3.

[0023] In actual applications, the first staged gas intake pipeline assembly is compatible with the second staged gas intake pipeline assembly, wherein the first staged gas intake pipeline assembly includes a staged gas intake pipeline 5, a dispersed gas pipeline 6, a staged gas nozzle 8 and a flue gas-gas mixing pipe 9, the tail end of the staged gas intake pipeline 5 is connected to the dispersed gas pipeline 6, the tail end of the dispersed gas pipeline 6 is connected to the staged gas nozzle 8, the other side of the staged gas nozzle 8 is connected to the flue gas-gas mixing pipe 9, and elliptical suction ports 11 are respectively provided on both sides of the staged gas nozzle 8. It should be noted that the bottom end of the staged gas intake pipeline 5 of the second staged gas intake pipeline assembly is connected to the combustion air intake pipeline 6.

[0024] In the gas burner, the main gas nozzle 3 includes a main gas nozzle body, a swirl blade 10 and a bolt connection interface 2. A connection hole is provided at the center of the head end of the main gas nozzle body. The main gas nozzle body is inserted into the installation bolt connection interface 2 through the connection hole. The swirl blades 10 are installed on both sides of the outside of the bolt connection interface 2. The tail end of the main gas intake pipeline 1 is connected to the main gas nozzle 3 through the bolt connection interface 2. In addition, the inner diameter of the main gas intake pipeline 1 is larger than the outer diameter of the bolt connection interface 2.

[0025] In actual application, a circular hole is provided at the center of the front end of the combustion-supporting air sleeve 7, and ventilation holes are provided at the top and bottom ends of the combustion-supporting air sleeve 7 respectively. A channel is provided inside the combustion-supporting air sleeve 7, and the circular hole connects the channel, and the channel connects the cavity, wherein the main gas intake pipeline 1 is installed inside the channel, and the front end of the main gas intake pipeline 1 passes through the circular hole.

[0026] It should be noted that in the present device, the distribution of the air volume during the air classification process is controlled by adjusting the self-resistance coefficient of the main gas nozzle 3. In actual applications, the self-resistance coefficient of the main gas nozzle 3 is adjusted by the rotation of the swirl blades 10 in the main gas nozzle body.

[0027] The utility model provides an ultra-low NOx gas burner with a replaceable nozzle, which utilizes combustion technologies such as fuel staging and air staging to achieve efficient combustion of gas and ultra-low NOx emissions. The main gas nozzle 3 is independently designed and is threadedly connected to the combustion-supporting air sleeve 7. The main gas intake pipeline 1 is fixed to the bellows with a slide rail, which is convenient for withdrawing and replacing the main fuel nozzle 3 with different structural forms. The position of the nozzle entering the furnace can be adjusted at the same time. The position of the main fuel nozzle can be adjusted according to different loads and working conditions, ensuring that the burner can achieve ultra-low emissions of nitrogen oxides under different working conditions, thereby solving the problem of excessive NOx emissions under low-load operating conditions of most gas burners on the market.

[0028] At present, the development of ultra-high efficiency and ultra-low nitrogen emission gas burners is of great significance to improving the domestic gas burner market. The utility model provides an ultra-low NOx gas burner with a replaceable nozzle. The working principle of the ultra-low NOx gas burner with a replaceable nozzle is described in detail below:

[0029] In this embodiment, it mainly includes a main gas intake pipeline 1, a bolt connection interface 2, a main gas nozzle 3, a combustion air intake pipeline 4, a graded gas intake pipeline 5, a dispersed gas pipeline 6, a combustion air sleeve 7, a graded gas nozzle 8, a flue gas and gas mixing pipe 9, a swirl blade 10 and an elliptical suction hole 11.

[0030] In actual application, one side of the top end of the combustion-supporting air sleeve 7 is connected to a first graded gas intake pipeline assembly, which includes a graded gas intake pipeline 5, a dispersed gas pipeline 6, a graded gas nozzle 8 and a flue gas-gas mixing pipe 9, the tail end of the graded gas intake pipeline 5 is connected to the dispersed gas pipeline 6, the tail end of the dispersed gas pipeline 6 is connected to the graded gas nozzle 8, the other side of the graded gas nozzle 8 is connected to the flue gas-gas mixing pipe 9, and elliptical suction ports 11 are respectively provided on both sides of the graded gas nozzle 8, and one side of the bottom end of the combustion-supporting air sleeve 7 is connected to a second graded gas intake pipeline assembly, which includes a graded gas intake pipeline 5, a dispersed gas pipeline 6, a graded gas nozzle 8 and a flue gas-gas mixing pipe 9, the tail end of the graded gas intake pipeline 5 is connected to the dispersed gas pipeline 6, the tail end of the dispersed gas pipeline 6 is connected to the graded gas nozzle 8, and the other side of the graded gas nozzle 8 is connected to the flue gas-gas mixing pipe 9. The gas mixing pipe 9 and the staged gas nozzle 8 are respectively provided with elliptical suction ports 11, the bottom end of the staged gas intake pipeline 5 of the second staged gas intake pipeline assembly is connected to the combustion air intake pipeline 4, a circular hole is provided at the center of the head end of the combustion air sleeve 7, and ventilation holes are respectively provided at the top and bottom ends of the combustion air sleeve 7, and a channel is provided inside the combustion air sleeve 7, the circular holes connect the channels, and the channels connect the cavities, wherein a main gas intake pipeline 1 is installed inside the channel, the head end of the main gas intake pipeline 1 passes through the circular hole, and a main gas nozzle 3 is independently installed in the cavity, the main gas nozzle 3 comprises a main gas nozzle body, swirl blades 10 and a bolt connection interface 2, a connection hole is provided at the center of the head end of the main gas nozzle body, the main gas nozzle body is inserted into the installation bolt connection interface 2 through the connection hole, swirl blades 10 are installed on both sides outside the bolt connection interface 2, and the tail end of the main gas intake pipeline 1 is connected to the main gas nozzle 3 through the bolt connection interface 2.

[0031] In this embodiment, the main combustion design concepts such as fuel staging and air staging are adopted. The fuel enters the burner through two gas pipelines, and jets are generated and combustion is organized through respective nozzles. The distribution of air volume during air staging is controlled by adjusting the resistance coefficient of the main gas nozzle 3 itself. The main gas nozzle 3 adopts an independent design and is threadedly connected to the combustion-supporting air sleeve 7 and is detachable. In addition, the main gas intake pipeline 1 is fixed to the bellows with a slide rail, which is convenient for pulling out and replacing the main fuel nozzle 3 with different structural forms; at the same time, the nozzle can be slid to adjust the position of entering the furnace, and the position of the main fuel nozzle 3 can be adjusted according to different loads and working conditions.

[0032] In actual applications, by adopting combustion design concepts such as fuel staging and air staging, the combustion air required for combustion enters the burner through the combustion air inlet pipe 4, and the combustion air is divided into two parts by the combustion air sleeve 7. The air in the middle sleeve is used as the combustion air of the intermediate main fuel, and is acted upon by the swirl blades 10 to form a rotating jet with a certain swirl number. The air outside the sleeve mainly supplies the combustion air for the dispersed and graded fuel.

[0033] In this embodiment, the graded fuel is freely distributed to the dispersed gas pipeline 6 through the graded gas intake pipeline 5. The gas in the pipeline is mixed with the surrounding flue gas sucked by the elliptical suction hole 11 through the graded gas nozzle 8, and then passes through the flue gas and gas mixing pipe 9 to form a mixed jet after mixing, thereby organizing the combustion of the peripheral gas.

[0034] In actual application, the main gas enters the burner through the main gas inlet pipeline 1, passes through the main gas nozzle 3, and fully interacts with the combustion-supporting air of the surrounding rotating jet after forming the main gas jet to organize the combustion of the main fuel.

[0035] The utility model provides a replaceable nozzle ultra-low NOx emission gas burner, which utilizes combustion technologies such as fuel staging and air staging, and is provided with a main gas intake pipeline and a staged gas intake pipeline assembly, which not only effectively realizes efficient combustion of gas, but also ensures that the burner can achieve ultra-low emissions of nitrogen oxides under different operating conditions, thereby solving the problem of excessive NOx emissions from most gas burners on the market under low-load operating conditions.

[0036] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An ultra-low NOx emission gas burner with replaceable nozzle, characterized in that: include: A combustion-supporting air sleeve (7), wherein one side of the top end of the combustion-supporting air sleeve (7) is connected to a first graded gas intake pipeline assembly, and one side of the bottom end of the combustion-supporting air sleeve (7) is connected to a second graded gas intake pipeline assembly. Both the first graded gas intake pipeline assembly and the second graded gas intake pipeline assembly are supplied with combustion-supporting air. The bottom end of the second graded gas intake pipeline assembly is connected to a combustion-supporting air intake pipeline (4). A main gas intake pipeline (1) is installed in the middle of the combustion-supporting air sleeve (7). The main gas intake pipeline (1) is supplied with main gas. A cavity is provided in the middle of the combustion-supporting air sleeve (7). A main gas nozzle (3) is independently installed in the cavity. The installation position of the main gas nozzle (3) is adjusted by sliding. The main gas intake pipeline (1) is detachably connected to the main gas nozzle (3).

2. The ultra-low NOx emission gas burner with replaceable nozzle according to claim 1, characterized in that: The first staged gas intake pipeline assembly and the second staged gas intake pipeline assembly are compatible with each other.

3. The ultra-low NOx emission gas burner with replaceable nozzle according to claim 2, characterized in that: The first staged gas intake pipeline assembly comprises a staged gas intake pipeline (5), a dispersed gas pipeline (6), a staged gas nozzle (8) and a flue gas-gas mixing pipe (9); the tail end of the staged gas intake pipeline (5) is connected to the dispersed gas pipeline (6), the tail end of the dispersed gas pipeline (6) is connected to the staged gas nozzle (8), and the other side of the staged gas nozzle (8) is connected to the flue gas-gas mixing pipe (9).

4. The ultra-low NOx emission gas burner with replaceable nozzle according to claim 3, characterized in that: Elliptical suction ports (11) are respectively provided on both sides of the graded gas nozzle (8).

5. The ultra-low NOx emission gas burner with replaceable nozzle according to claim 3, characterized in that: The bottom end of the staged fuel gas intake pipeline (5) of the second staged fuel gas intake pipeline assembly is connected to the combustion air intake pipeline (4).

6. The ultra-low NOx emission gas burner with replaceable nozzle according to claim 1, characterized in that: The main gas nozzle (3) comprises a main gas nozzle body, swirl blades (10) and a bolt connection interface (2); a connection hole is provided at the center of the head end of the main gas nozzle body; the main gas nozzle body is inserted into the mounting bolt connection interface (2) through the connection hole; and swirl blades (10) are mounted on both sides of the outside of the bolt connection interface (2).

7. The ultra-low NOx emission gas burner with replaceable nozzle according to claim 6, characterized in that: The tail end of the main gas inlet pipeline (1) is connected to the main gas nozzle (3) via a bolt connection interface (2).

8. The ultra-low NOx emission gas burner with replaceable nozzle according to claim 7, characterized in that: The inner diameter of the main gas intake pipeline (1) is greater than the outer diameter of the bolt connection interface (2).

9. The ultra-low NOx emission gas burner with replaceable nozzle according to claim 1, characterized in that: A circular hole is provided at the center of the front end of the combustion-supporting air sleeve (7), ventilation holes are provided at the top and bottom ends of the combustion-supporting air sleeve (7), and a channel is provided inside the combustion-supporting air sleeve (7), the circular hole is connected to the channel, and the channel is connected to the cavity.

10. The ultra-low NOx emission gas burner with replaceable nozzle according to claim 9, characterized in that: A main gas intake pipeline (1) is installed inside the channel, and a circular hole is formed at the head end of the main gas intake pipeline (1).

Images