Low-load combustion control device for boiler burner

Abstract

The utility model relates to a low-load combustion control device for a boiler burner, which belongs to the technical field of boiler burners and comprises a combustion shell, three layers of fuel nozzles are uniformly distributed on the inner side wall of the combustion shell, and a lifting combustion device is arranged in the combustion shell. The lifting combustion device comprises a lifting hydraulic rod fixedly installed at the bottom of the combustion shell. According to the low-load combustion control device for the boiler combustor, the lifting combustion device is arranged in the combustion shell, and a lifting hydraulic rod drives a main combustion head to move upwards in the combustion shell, so that the main combustion head is close to the upper layer of a fuel nozzle, and during low-load combustion, only an upper-layer input pipe is opened; fuel is input into the fuel nozzles through the upper-layer fuel pipe to be sprayed into the combustion shell for combustion, and the problem that the position of the main combustion head is fixed, so that the distance between the main combustion head and part of fuel output ports is fixed, and combustion is unstable is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler burners, in particular to a low-load combustion control device for a boiler burner. Background Art

[0002] The boiler burner is the most important equipment in the auxiliary equipment of oil and gas boilers. It is mainly used to make the fuel and air spray out in a certain way for mixed combustion. This type of burner is mainly divided into oil burners, gas burners and dual-fuel burners. Among them, oil burners can be divided into light oil burners and heavy oil burners. Light oil mainly refers to diesel, while heavy oil refers to the heavy oil left after gasoline and diesel are extracted from crude oil. Gas burners include natural gas burners, city gas burners, liquefied petroleum gas burners and biogas burners.

[0003] When the boiler burner is burning at low load, special attention should be paid to some issues to ensure safe and stable operation. Under low load conditions, the burner fuel gas volume is small, the combustion chamber temperature is low, and the flue gas flow rate is slow. These characteristics make low-load combustion more prone to stability problems than full load. This usually involves adjusting the burner, including the fuel supply and air mixing ratio. By optimizing these parameters, combustion efficiency can be improved, pollutant emissions can be reduced, and energy consumption can be reduced.

[0004] A common low-load combustion control device for a boiler burner has multiple layers of fuel outlets in the combustion chamber. During low-load combustion, usually only a portion of them needs to be opened. At this time, the main combustion head of the low-load combustion control device for the boiler burner ignites the fuel. However, the position of the main combustion head is fixed, so that the distance between the main combustion head and some fuel outlets is fixed, resulting in unstable combustion. In view of this, the present application proposes a low-load combustion control device for a boiler burner. Utility Model Content

[0005] In view of the shortcomings of the prior art, the utility model provides a low-load combustion control device for a boiler burner, which has the advantages of adjusting the position of a main combustion head, etc., and solves the problem that the position of the main combustion head is fixed, so that the distance between the main combustion head and some fuel output ports is fixed, resulting in unstable combustion.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: A low-load combustion control device for a boiler burner, comprising a combustion shell, the inner wall of which is evenly distributed with three layers of fuel nozzles, and a lifting combustion device is arranged inside the combustion shell;

[0007] The lifting combustion device includes a lifting hydraulic rod fixedly installed at the bottom of the combustion shell, and a main combustion head is fixedly installed at the movable end of the lifting hydraulic rod located inside the combustion shell, a movable protection tube is fixedly installed on the top of the main combustion head, a fuel joint is threadedly installed on the bottom end of the movable protection tube, and a transmission hose is fixedly installed at the bottom of the fuel joint.

[0008] Furthermore, a water storage cavity is provided inside the tube wall of the movable protection tube, the water storage cavity is filled with heat-insulating water, and the bottom end of the movable protection tube extends to the outside of the combustion shell.

[0009] Furthermore, an upper fuel pipe, a middle fuel pipe and a bottom fuel pipe are fixedly installed on the surface of the combustion shell, the upper fuel pipe is connected to the upper fuel nozzle, the middle fuel pipe is connected to the middle fuel nozzle, and the bottom fuel pipe is connected to the bottom fuel nozzle.

[0010] Furthermore, an upper layer input pipe is fixedly installed on the surface of the upper layer fuel pipe, a middle layer input pipe is fixedly installed on the surface of the middle layer fuel pipe, and a bottom layer input pipe is fixedly installed on the surface of the bottom layer fuel pipe.

[0011] Furthermore, fuel control valves are fixedly installed on the surfaces of the upper layer input pipe, the middle layer input pipe and the bottom layer input pipe.

[0012] Furthermore, four air intake pipes are fixedly mounted on the inner bottom wall of the combustion shell, and the output directions of the four air intake pipes are all clockwise.

[0013] Furthermore, the four air inlet pipes extend to the bottom ends below the combustion shell and are fixedly installed with connecting ring pipes, the bottoms of the connecting ring pipes are fixedly installed with input air pipes, and the surfaces of the input air pipes are fixedly installed with intake control valves.

[0014] Compared with the prior art, the utility model provides a low-load combustion control device for a boiler burner, which has the following beneficial effects:

[0015] The low-load combustion control device of the boiler burner is provided with a lifting combustion device inside the combustion shell, and the main combustion head is driven to move upward inside the combustion shell by the lifting hydraulic rod, so that the main combustion head is close to the upper layer of the fuel nozzle. When low-load combustion is carried out, only the upper layer input pipe is opened, and the fuel is input into the fuel nozzle through the upper layer fuel pipe and sprayed into the combustion shell for combustion. This solves the problem of unstable combustion caused by the fixed position of the main combustion head and the fixed distance between the main combustion head and some fuel output ports. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 This is a front view of the structure of the utility model;

[0018] Figure 3 This is a front view cross-sectional view of the main combustion head of the utility model;

[0019] Figure 4 It is a three-dimensional schematic diagram of the air intake pipe of the utility model.

[0020] In the figure: 1. combustion shell; 2. fuel nozzle; 3. lifting hydraulic rod; 4. main combustion head; 5. movable protection tube; 51. water storage cavity; 6. fuel joint; 7. transmission hose; 8. upper fuel pipe; 9. middle fuel pipe; 10. bottom fuel pipe; 11. upper input pipe; 12. middle input pipe; 13. bottom input pipe; 14. fuel control valve; 15. air intake pipe; 16. connecting ring pipe; 17. input air pipe; 18. air intake control valve. DETAILED DESCRIPTION

[0021] 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.

[0022] See also Figure 1-4 A low-load combustion control device for a boiler burner comprises a combustion shell 1, the inner wall of the combustion shell 1 is evenly distributed with three layers of fuel nozzles 2, and a lifting combustion device is arranged inside the combustion shell 1.

[0023] Among them, an upper fuel pipe 8, a middle fuel pipe 9 and a bottom fuel pipe 10 are fixedly installed on the surface of the combustion shell 1, the upper fuel pipe 8 is connected to the upper fuel nozzle 2, the middle fuel pipe 9 is connected to the middle fuel nozzle 2, and the bottom fuel pipe 10 is connected to the bottom fuel nozzle 2.

[0024] Secondly, an upper layer input pipe 11 is fixedly installed on the surface of the upper layer fuel pipe 8 , a middle layer input pipe 12 is fixedly installed on the surface of the middle layer fuel pipe 9 , and a bottom layer input pipe 13 is fixedly installed on the surface of the bottom layer fuel pipe 10 .

[0025] Fuel control valves 14 are fixedly installed on the surfaces of the upper layer input pipe 11, the middle layer input pipe 12 and the bottom layer input pipe 13. By controlling the switch and opening and closing size of the three fuel control valves 14, the amount of fuel input is controlled.

[0026] At the same time, the lifting combustion device includes a lifting hydraulic rod 3 fixedly installed at the bottom of the combustion shell 1, and the main combustion head 4 is fixedly installed at the movable end of the lifting hydraulic rod 3 located inside the combustion shell 1. A movable protection tube 5 is fixedly installed on the top of the main combustion head 4, and a fuel connector 6 is threadedly installed on the bottom end of the movable protection tube 5. A transmission hose 7 is fixedly installed at the bottom of the fuel connector 6.

[0027] The wall of the mobile protective tube 5 is provided with a water storage cavity 51, which is filled with heat-insulating water, and the bottom end of the mobile protective tube 5 extends to the outside of the combustion shell 1. When the fuel control valves 14 on the surface of the middle layer input pipe 12 and the bottom layer input pipe 13 are closed, the fuel control valve 14 on the surface of the upper layer input pipe 11 is adjusted down, and the amount of fuel entering the combustion shell 1 is minimal at this time, and the main combustion head 4 is moved to the bottom of the upper layer fuel nozzle 2 by the lifting hydraulic rod 3, so that the combustion is more stable.

[0028] At the same time, four air inlet pipes 15 are fixedly mounted on the inner bottom wall of the combustion shell 1, and the output directions of the four air inlet pipes 15 are all in the clockwise direction.

[0029] The four air inlet pipes 15 extend to the bottom end below the combustion shell 1 and are fixedly installed with a connecting ring pipe 16 . An input air pipe 17 is fixedly installed at the bottom of the connecting ring pipe 16 . An air inlet control valve 18 is fixedly installed on the surface of the input air pipe 17 .

[0030] When this embodiment is in use, the fuel input amount is controlled by controlling the switching and opening and closing size of the three fuel control valves 14, and the position of the main combustion head 4 is adjusted by lifting the combustion device, so that the fuel combustion is more stable.

[0031] The electrical components appearing in the article are all electrically connected to the main controller and the power supply. The main controller can be a conventional known device for control such as a computer, and the existing public power connection technology is not described in detail in the article.

[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-load combustion control device for a boiler burner, comprising a combustion casing (1), characterized in that: The inner wall of the combustion shell (1) is evenly distributed with three layers of fuel nozzles (2), and a lifting combustion device is arranged inside the combustion shell (1); The lifting combustion device comprises a lifting hydraulic rod (3) fixedly mounted at the bottom of the combustion shell (1); a main combustion head (4) is fixedly mounted on the movable end of the lifting hydraulic rod (3) located inside the combustion shell (1); a movable protective tube (5) is fixedly mounted on the top of the main combustion head (4); a fuel connector (6) is threadedly mounted on the bottom end of the movable protective tube (5); and a transmission hose (7) is fixedly mounted on the bottom of the fuel connector (6).

2. A low-load combustion control device for a boiler burner according to claim 1, characterized in that: A water storage cavity (51) is provided inside the tube wall of the movable protection tube (5), and the water storage cavity (51) is filled with heat-insulating water. The bottom end of the movable protection tube (5) extends to the outside of the combustion shell (1).

3. A low-load combustion control device for a boiler burner according to claim 1, characterized in that: An upper fuel pipe (8), a middle fuel pipe (9) and a bottom fuel pipe (10) are fixedly mounted on the surface of the combustion shell (1); the upper fuel pipe (8) is connected to the upper fuel nozzle (2); the middle fuel pipe (9) is connected to the middle fuel nozzle (2); and the bottom fuel pipe (10) is connected to the bottom fuel nozzle (2).

4. A low-load combustion control device for a boiler burner according to claim 3, characterized in that: An upper layer input pipe (11) is fixedly mounted on the surface of the upper layer fuel pipe (8), a middle layer input pipe (12) is fixedly mounted on the surface of the middle layer fuel pipe (9), and a bottom layer input pipe (13) is fixedly mounted on the surface of the bottom layer fuel pipe (10).

5. A low-load combustion control device for a boiler burner according to claim 4, characterized in that: A fuel control valve (14) is fixedly mounted on the surfaces of the upper layer input pipe (11), the middle layer input pipe (12) and the bottom layer input pipe (13).

6. A low-load combustion control device for a boiler burner according to claim 1, characterized in that: Four air intake pipes (15) are fixedly mounted on the inner bottom wall of the combustion shell (1), and the output directions of the four air intake pipes (15) are all in the clockwise direction.

7. A low-load combustion control device for a boiler burner according to claim 6, characterized in that: The four air inlet pipes (15) extend to the bottom end below the combustion shell (1) and are fixedly mounted with a connecting ring pipe (16); an air input pipe (17) is fixedly mounted at the bottom of the connecting ring pipe (16); and an air intake control valve (18) is fixedly mounted on the surface of the air input pipe (17).

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