Fuel mixing and flow equalizing device for boiler

Abstract

The utility model discloses a fuel mixing and flow equalizing device for a boiler. The fuel mixing and flow equalizing device is suitable for a low-nitrogen premixing gas-fired boiler. The device consists of an air inlet box body, a sensor seat, a mixer, a flow equalizing box, a turbulent flow box, a first flow equalizing plate, a second flow equalizing plate, a guide plate and a side plate. The air inlet box body is located at the front end of the device, adopts a slope structure to guide air to enter uniformly, and is provided with a sensor seat for installing an air pressure sensor. The mixer is connected with the air inlet box body, and gas is preliminarily mixed with air in the mixer through the inlet and then enters the flow equalizing box. A first flow equalizing plate and a second flow equalizing plate are arranged in the flow equalizing box, and gas is evenly distributed through evenly-arranged flow equalizing holes. And then the mixed gas enters the turbulent flow box, is further disturbed and guided by the guide plate, and finally is fed into a boiler hearth through a channel limited by the side plate. The device is compact in structure, air and fuel gas can be efficiently and evenly mixed, the combustion efficiency is improved, and emission of nitric oxide is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a boiler field, concretely relates to a fuel mixing and flow uniformizing device for boiler, and is especially suitable for low nitrogen premixing boiler. BACKGROUND

[0002] With the increasing environmental protection requirement, the design of boiler combustion device pays more and more attention to combustion efficiency and low emission, and gas boiler is widely used in industrial and living fields due to its characteristics of cleanness, low pollution and high efficiency; however, the traditional gas boiler burner adopts simple fuel mixing technology, and the mixing of fuel and air entering the furnace is not uniform enough, which leads to insufficient combustion and generates high concentration of pollutants such as nitrogen oxides (NOx); in addition, due to the poor mixing of gas and air, the thermal efficiency of the boiler is reduced, and safety problems such as deflagration may also be caused.

[0003] Some existing technologies improve the fuel mixing structure to improve the mixing effect of gas and air; however, such technologies still have the problem of uneven distribution of mixed fuel entering the furnace, which leads to uneven temperature in the furnace, unsatisfactory heat exchange effect, and difficulty in further reducing the emission of NOx.

[0004] In order to solve the above problems, the present application provides a new fuel mixing and flow uniformizing device, which can optimize the mixing effect of gas and air, and realize uniform distribution of the mixed gas before entering the furnace, so as to ensure sufficient and efficient combustion, reduce the generation of pollutants, and improve the safety and stability of the boiler operation. SUMMARY

[0005] The utility model provides a kind of fuel mixing and flow uniformizing device for boiler, and is especially suitable for low nitrogen premixing gas boiler, the device is mixed and is uniformly distributed by efficient air and gas, to improve the combustion efficiency of boiler, reduce the emission of nitrogen oxides (NOx), while enhancing the safety and stability of the boiler operation.

[0006] The device is mainly composed of an air inlet box, a sensor seat, a mixer, a flow uniformizing box, a turbulence box, a first flow uniformizing plate, a second flow uniformizing plate, a guide plate and a side plate. The front end is connected with a fan, and the rear end is connected with a boiler tube bundle. When the boiler is running, air is sent into the air inlet box by the fan. The air inlet box is designed with a slope, so that the air flow is more uniform and the resistance is reduced. A wind pressure sensor or other monitoring equipment can be installed on the sensor seat to monitor the air flow state in real time.

[0007] Further, the gas enters the mixer to be preliminarily mixed with air, and then the mixed gas passes through the flow uniformizing plate with a porous structure to realize uniform distribution. Subsequently, the mixed gas enters the turbulence box, and the guide plate further disturbs and guides the air flow to ensure stable flow and sufficient mixing of the mixed gas. Finally, the mixed gas enters the boiler combustion furnace.

[0008] Improved mixing uniformity: The multi-stage flow plate and guide plate design ensures that gas and air are fully and uniformly mixed, avoiding local overheating or incomplete combustion phenomena.

[0009] Improved combustion efficiency: Optimized gas flow and mixing promote the completeness of combustion, improving the overall thermal efficiency of the boiler and reducing fuel waste.

[0010] Improved environmental performance: The device effectively reduces the generation of nitrogen oxides (NOx), meeting increasingly stringent environmental requirements.

[0011] Enhanced safety: Through the design of turbulence and flow uniformity, the risk of furnace explosion caused by unstable airflow is reduced, significantly improving the safety of boiler operation.

[0012] The utility model has the advantages of simple structure, convenient installation and maintenance, and is suitable for the improvement and application of various gas boilers, especially for industrial and domestic boiler systems with high environmental protection requirements, and has significant energy-saving and emission-reducing effects. BRIEF DESCRIPTION OF DRAWINGS

[0013] Other features, objects and advantages of the present disclosure will become more apparent through the following detailed description of non-limiting embodiments, in conjunction with the accompanying drawings, in which:

[0014] ATTACHMENT Figure 1 An internal and external structure diagram of a fuel mixing and flow uniformity device according to an embodiment of the present disclosure is shown.

[0015] ATTACHMENT Figure 2 A shaft side view of a fuel mixing and flow uniformity device according to an embodiment of the present disclosure is shown.

[0016] ATTACHMENT Figure 3 A side plate structure diagram of a fuel mixing and flow uniformity device according to an embodiment of the present disclosure is shown.

[0017] ATTACHMENT Figure 4 A first flow uniformity plate structure diagram of a fuel mixing and flow uniformity device according to an embodiment of the present disclosure is shown.

[0018] ATTACHMENT Figure 5 A system diagram of an application example of a fuel mixing and flow uniformity device according to an embodiment of the present disclosure is shown.

[0019] In the figure, the air inlet box 1, the sensor seat 2, the mixer 3, the flow uniformity box 4, the turbulence box 5, the first flow uniformity plate 6, the second flow uniformity plate 7, the guide plate 8, and the side plate 9. DETAILED DESCRIPTION

[0020] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement it; and, for the sake of clarity, parts irrelevant to describing the exemplary embodiments are omitted in the drawings.

[0021] Specifically, the fuel mixing and flow uniformizing device is composed of an air inlet box 1, a sensor seat 2, a mixer 3, a flow uniformizing box 4, a turbulence box 5, a first flow uniformizing plate 6, a second flow uniformizing plate 7, a flow guide plate 8, and a side plate 9.

[0022] In combination with the above drawings, the specific description is as follows.

[0023] The fuel mixing and flow uniformizing device is connected with a fan at the front end and connected with a boiler tube bundle at the rear end; when the boiler is running, the fan is started to send air into the air inlet box 1; the air inlet box 1 is designed with a slope to guide the air flow and ensure its uniform distribution, while reducing the air flow resistance.

[0024] The air inlet box 1 is provided with the sensor seat 2, which can be connected with an air pressure sensor to accurately detect the air pressure value, and also can be connected with detection instruments other than the air pressure sensor.

[0025] The air inlet box 1 is connected with the mixer 3 at the upper part; the gas enters the mixer 3 through the gas inlet on the mixer 3, and the gas and air are preliminarily mixed in the mixer and then enter the flow uniformizing box 4.

[0026] The flow uniformizing box 4 is provided with the first flow uniformizing plate 6 and the second flow uniformizing plate 7; the first flow uniformizing plate 6 and the second flow uniformizing plate 7 are uniformly distributed with a plurality of flow uniformizing holes on the upper surface, which are used for flow uniformizing and turbulence treatment of the mixed gas to ensure the uniform distribution of the air flow entering the furnace; after the mixed gas flows out of the flow uniformizing box 4, it enters the turbulence box 5.

[0027] The turbulence box 5 is provided with a plurality of flow guide plates 8, which further disturb the flow while guiding the mixed gas; finally, the mixed gas enters the furnace for combustion through the box composed of the turbulence box 5 and the side plate 9.

[0028] A plurality of rectangular holes are formed in the upper part of the side plate 9, which are used for limiting the flow guide plates 8 and facilitating welding.

[0029] A cutout is formed in the right side of the side plate 9, which is used for reducing the deformation during welding.

[0030] The above has described the specific implementation of the present utility model in detail, but only as an example, and equivalent modifications of the present utility model are also within the protection scope of the present utility model.

Claims

1. A fuel mixing and flow uniformizing device for a boiler, characterized in that The device comprises an air inlet box (1), a sensor seat (2), a mixer (3), a flow equalizing box (4), a turbulence box (5), a first flow equalizing plate (6), a second flow equalizing plate (7), a flow guide plate (8) and a side plate (9); The air inlet box (1) is located at the front end of the device and is connected with the fan, and is designed with an inclined surface to guide the air flow and ensure its uniform inflow; The sensor seat (2) is arranged on the air inlet box (1) and is used to connect the air pressure sensor to monitor the air pressure; The mixer (3) is connected with the air inlet box (1) and is used to receive air and introduce gas through its gas inlet, and the gas and air are preliminarily mixed in the mixer (3) and then enter the flow equalizing box (4); The flow equalizing box (4) is provided with the first flow equalizing plate (6) and the second flow equalizing plate (7), and a plurality of flow equalizing holes are arranged on the flow equalizing plates to perform flow equalizing treatment on the mixed gas to ensure the uniform flow of the mixed gas; The turbulence box (5) is connected with the flow equalizing box (4) and is internally provided with a plurality of flow guide plates (8) to perform turbulence guiding treatment on the mixed gas entering the box to further optimize the gas flow; The side plate (9) and the turbulence box (5) jointly form a box body to guide the mixed gas to the combustion furnace of the boiler.

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