High-safety low-nitrogen burner for boiler

Abstract

The utility model discloses a low-nitrogen burner with high safety for a boiler, which relates to the technical field of burners, and comprises a burner and a combustion chamber, the combustion chamber is connected with a combustion port of the burner, a flue is mounted at the tail end of the combustion chamber, a smoke backflow structure is mounted on the lower wall surfaces of the burner and the flue, a flame dividing structure is arranged at the combustion port of the burner, and the flame dividing structure is connected with the combustion chamber. A heat exchange structure is arranged in the combustion chamber; the flue gas backflow structure comprises a flue gas backflow pipeline, a one-way valve and a flue gas backflow air pump; according to the utility model, the generation amount of nitrogen oxides generated by the burner is reduced in two aspects, namely, the oxygen content of a mixture of fuel and air is reduced, flue gas with less oxygen content is mixed into the mixture of fuel and air, so that the oxygen content of the fuel is reduced, and concentrated large flames are converted into a plurality of small flames, so that the combustion efficiency is improved. Therefore, the flame combustion temperature is reduced, and the generation of nitrogen oxides is further reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a burner technical field especially relates to a high safety low nitrogen burner for boiler. BACKGROUND

[0002] The burner is the device that mixes and burns fuel and air in a certain way. The burner is divided into industrial burner, combustion machine, civil burner and special burner according to type and application field. It is made of corrosion-resistant and high-temperature-resistant material such as stainless steel or metal titanium. The function of the burner is to atomize the sample by flame combustion. The atomized test solution enters the burner, and under the action of flame temperature and flame atmosphere, it goes through drying, melting, evaporation, dissociation and other processes to produce a large number of ground state atoms, as well as some excited state atoms, ions and molecules.

[0003] The main ways of nitrogen oxides produced by the burner include fuel type, thermal type and rapid type. Among them, thermal type, nitrogen in air is oxidized to generate nitrogen oxide at high temperature in the combustion process, mainly generated in the high-temperature zone with temperature higher than 1800K, and its generation mechanism is derived from Zeldovich model. The concentration of thermal nitrogen oxide increases with the increase of temperature and oxygen concentration.

[0004] The nitrogen oxide produced by the burner has many hazards, harm to human health, nitric oxide has strong affinity for hemoglobin in human blood, 100 times more than carbon monoxide, and can cause severe oxygen deficiency in blood after inhalation, damage to central nervous system, and even cause paralysis. Nitrogen dioxide has strong stimulating effect on respiratory organs, which can cause chemical lesions of alveolar tissue. Under the action of sunlight, nitrogen oxide reacts with ultraviolet to form photochemical smog, which stimulates eyes and respiratory tract, causes visual impairment, hand-foot convulsion and other symptoms, and long-term existence also causes arteriosclerosis and physiological function decline. Harm to the environment, nitrogen oxide dissolves in water to form nitric acid rain, which corrodes buildings and industrial equipment, damages open-air cultural relics, damages plant leaves, causes forest death, affects lake ecology, destroys soil composition, affects crop growth, photochemical smog is harmful to human health, and also stimulates eyes and respiratory tract, causes plant growth disorder and serious corrosion of metal objects. INVENTION CONTENTS

[0005] The utility model discloses a kind of low nitrogen burners for boiler with high safety, to solve the shortcomings in prior art.

[0006] To achieve the above object, the utility model adopts the following technical scheme:

[0007] The utility model provides a safe low nitrogen combustor for boiler, include: combustor and combustion chamber, the combustion port of combustor and combustion chamber is connected, the tail end of combustion chamber is equipped with flue, the lower wall surface of combustor and flue is equipped with flue gas backflow structure, the combustion port of combustor is equipped with split flame structure, the inside of combustion chamber is equipped with heat exchange structure, the flue gas backflow structure includes: flue gas backflow pipeline, check valve and flue gas backflow air pump, the both ends of flue gas backflow pipeline are installed in the lower wall surface of flue and combustor respectively, check valve is installed outside flue gas backflow pipeline, flue gas backflow air pump is installed outside flue gas backflow pipeline.

[0008] The utility model further sets up, and the split flame structure includes: split flame support plate and six combustion spray heads, split flame support plate is installed in the combustion port of combustor, and split flame support plate is equipped with six mounting holes, and six combustion spray heads are installed in six mounting holes of split flame support plate respectively.

[0009] The utility model further sets up, and the heat exchange structure includes: a plurality of heat exchange pipes, water inlet main pipe and water outlet main pipe, a plurality of heat exchange pipes are installed in the inside of combustion chamber respectively, water inlet main pipe is installed in one end of a plurality of heat exchange pipes, and water outlet main pipe is installed in the other end of a plurality of heat exchange pipes.

[0010] The utility model further sets up, and the upper wall surface of combustor is equipped with oxygen content sensor.

[0011] The utility model further sets up, and the combustion chamber is cylindrical.

[0012] The utility model further sets up, and water inlet main pipe is set up in one end of a plurality of heat exchange pipes close to combustor.

[0013] The utility model has the advantages that: the utility model reduces the generation amount of nitrogen oxide of combustor through two aspects, one is to reduce the oxygen content of fuel and air mixture, and the oxygen content of fuel is reduced by mixing flue gas with less oxygen content into fuel and air mixture, and the utility model changes centralized large flame into multiple small flames, thereby reducing the temperature of flame combustion and further reducing the generation of nitrogen oxide. ACCURACY

[0014] Fig. 1 It is the whole structure schematic diagram of the utility model to propose a safe low nitrogen combustor for boiler;

[0015] Fig. 2 It is the split flame structure schematic diagram of the utility model to propose a safe low nitrogen combustor for boiler;

[0016] Fig. 3The utility model provides a heat exchange structure diagram of high safety's low nitrogen combustor for boiler.

[0017] In the figure: 1, combustor; 2, combustion chamber; 3, flue; 4, flue gas backflow pipeline; 5, check valve; 6, flue gas backflow air pump; 7, flame splitting support plate; 8, combustion spray head; 9, several heat exchange pipes; 10, water inlet main pipe; 11, water outlet main pipe; 12, oxygen content sensor. DETAILED DESCRIPTION

[0018] The technical scheme of the patent will be further described in detail in connection with specific implementation manners.

[0019] The embodiments of the patent are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the patent and cannot be understood as a limitation on the patent.

[0020] In the description of the patent, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the patent and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the patent.

[0021] In the description of the patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "setting" should be understood broadly, for example, it can be fixedly connected, set, or it can be detachably connected, set, or integrally connected, set. For those skilled in the art, the specific meaning of the above terms in the patent can be understood according to the specific circumstances.

[0022] REFERENCE Figs. 1-3 A kind of safety high's low nitrogen combustor for boiler, including: combustor 1 and combustion chamber 2, combustion chamber 2 and the combustion port of combustor 1 are connected, the tail end of combustion chamber 2 is equipped with flue 3, flue gas backflow structure is installed in the lower wall surface of combustor 1 and flue 3, the combustion port of combustor 1 is equipped with flame splitting structure, the inside of combustion chamber 2 is equipped with heat exchange structure;Flue gas backflow structure includes: flue gas backflow pipeline 4, check valve 5 and flue gas backflow air pump 6;Two ends of flue gas backflow pipeline 4 are installed at the lower wall surface of flue 3 and combustor 1 respectively, check valve 5 is installed at the outside of flue gas backflow pipeline 4, flue gas backflow air pump 6 is installed at the outside of flue gas backflow pipeline 4, the upper wall surface of combustor 1 is equipped with oxygen content sensor 12, and combustion chamber 2 is cylindrical.

[0023] Specifically, the flame separation structure comprises a flame separation support plate 7 and six combustion nozzles 8; the flame separation support plate 7 is installed in the combustion port of the burner 1, and the flame separation support plate 7 is provided with six mounting holes, and the six combustion nozzles 8 are respectively installed in the six mounting holes of the flame separation support plate 7.

[0024] Specifically, the heat exchange structure comprises a plurality of heat exchange pipes 9, an inlet water main 10 and an outlet water main 11; the plurality of heat exchange pipes 9 are respectively installed in the interior of the combustion chamber 2, the inlet water main 10 is installed at one end of the plurality of heat exchange pipes 9, the outlet water main 11 is installed at the other end of the plurality of heat exchange pipes 9, and the inlet water main 10 is arranged at the end of the plurality of heat exchange pipes 9 close to the burner 1.

[0025] Working principle: before using the utility model, the operator first connects the water source and the inlet water main 10, and connects the outlet water main 11 and the equipment needing hot water, then the operator connects the external alternating power supply to the utility model, provides energy for the electric appliance in the utility model, then the operator starts the utility model, the burner 1 starts to work, the fuel and air mixture is sprayed out through the six combustion nozzles 8 and is ignited, the six groups of flames heat the plurality of heat exchange pipes 9 in the combustion chamber 2, at this time, the oxygen content sensor 12 detects that the oxygen content of the fuel and air mixture can be obtained, when the oxygen content is too high, the flue gas backflow pump 6 starts to work, the flue gas after combustion passes through the flue 3 and the flue gas backflow pipeline 4, returns to the interior of the burner 1, which can effectively reduce the oxygen content of the fuel and air mixture, thereby reducing the intensity of combustion and reducing the generation of nitrogen oxides.

[0026] The above describes only the preferred specific implementation of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A low-NOx burner for boilers with high safety, comprising: A burner (1) and a combustion chamber (2) are connected at the combustion port of the burner (1). The combustion chamber (2) is characterized in that a flue (3) is installed at the tail end of the combustion chamber (2), a flue gas recirculation structure is installed on the lower wall of the burner (1) and the flue (3), a flame splitting structure is provided at the combustion port of the burner (1), and a heat exchange structure is provided inside the combustion chamber (2). The flue gas recirculation structure includes a flue gas recirculation pipe (4), a one-way valve (5), and a flue gas recirculation pump (6). The two ends of the flue gas recirculation pipe (4) are respectively installed on the lower wall of the flue (3) and the burner (1), the one-way valve (5) is installed outside the flue gas recirculation pipe (4), and the flue gas recirculation pump (6) is installed outside the flue gas recirculation pipe (4).

2. The low-NOx burner for boilers with high safety according to claim 1, characterized in that, The flame splitting structure includes: a flame splitting support plate (7) and six combustion nozzles (8); The flame distribution support plate (7) is installed inside the combustion port of the burner (1), and the flame distribution support plate (7) has six mounting holes, and the six combustion nozzles (8) are respectively installed in the six mounting holes of the flame distribution support plate (7).

3. A low-NOx burner for boilers with high safety according to claim 1, characterized in that, The heat exchange structure includes: a plurality of heat exchange tubes (9), an inlet main pipe (10), and an outlet main pipe (11); Several heat exchange tubes (9) are respectively installed inside the combustion chamber (2), the water inlet main pipe (10) is installed at one end of several heat exchange tubes (9), and the water outlet main pipe (11) is installed at the other end of several heat exchange tubes (9).

4. A low-NOx burner for boilers with high safety according to claim 1, characterized in that, The upper wall of the burner (1) is provided with an oxygen content sensor (12).

5. A low-NOx burner for boilers with high safety according to claim 1, characterized in that, The combustion chamber (2) is cylindrical.

6. A low-NOx burner for boilers with high safety according to claim 3, characterized in that, The main water inlet pipe (10) is located at one end of several heat exchange tubes (9) near the burner (1).

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