Novel low-nitrogen combustor suitable for peak regulation type LNG gasification furnace

Abstract

The invention discloses a novel low-nitrogen combustor suitable for a peak regulation type LNG gasification furnace, and relates to the technical field of low-nitrogen combustors. Comprising a burner body which is hollow, and the two ends of the burner body are open; the burner nozzle is arranged at the top of the burner body, the first end of the burner nozzle is communicated with the outside, the second end of the burner nozzle is communicated with the burner body, and the diameter of the first end of the burner nozzle is smaller than that of the second end of the burner nozzle; the air pipe is arranged at the bottom of the burner body and communicates with the burner body; the fuel gas pipe is arranged in the air pipe, and the fuel gas pipe is communicated with the air pipe. Through arrangement of the fuel gas pipe and the air pipe, mixing of fuel gas and air is enhanced, the combustion efficiency and the burn-off rate are improved, and generation of NOX is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of low-nitrogen burners, and in particular to a novel low-nitrogen burner suitable for a peak-shaving LNG gasifier. Background Art

[0002] Peak-shaving LNG gasifier is the core equipment that converts liquefied natural gas (LNG) from -162℃ liquid to normal temperature gas. Its gasification capacity covers 50-5000Nm 3 / h, and is widely used in urban gas peak shaving, industrial fuel substitution, and transportation energy supply. The equipment primarily consists of a cryogenic storage tank, a vaporizer assembly, a pressure regulator, and an intelligent control system. The vaporizers are available in two types: air-temperature and water-bath. The air-temperature vaporizer uses star-shaped finned tubes to absorb ambient heat to achieve phase change, making it suitable for regions with higher temperatures. The water-bath type utilizes circulating hot water for heating, ensuring stable vaporization in extremely low temperatures. The workflow includes four key steps: LNG pressurization and transportation, vaporization heat absorption, pressure regulation and stabilization, and safety handling (odorization and metering). The system ensures safety through dual-circuit pressure regulation, an emergency shut-off valve, and a leak detection linkage mechanism. Its core technology lies in efficient heat exchange design and the use of cryogenic materials. For example, high-strength aluminum alloy finned tubes can increase heat transfer efficiency by over 30%. The equipment also meets the GB / T20368-2021 standard, has a design life of 15 years, and offers modular deployment and low energy consumption.

[0003] In industrial applications, LNG gasifiers are helping energy-intensive industries like ceramics and glass achieve clean fuel substitution and reduce production costs. In the transportation sector, LNG gasifiers, as core equipment for LNG filling stations, support the development of green logistics. Future trends will focus on material innovation (such as nano-coatings to enhance corrosion resistance), smart energy management, and miniaturized design to meet the needs of distributed energy and gas supply in remote areas, promoting the coordinated development of efficient natural gas utilization and carbon neutrality goals.

[0004] However, as emission standards in various regions become increasingly stringent, the NO X Emission requirements are also gradually increasing. According to the Emission Standard of Air Pollutants from Boilers (GB 13271-2014), gas boilers NO x The limit is 150-200mg / Nm 3 , the limit in key areas is 80-100mg / Nm 3 Some provinces and cities have further tightened the limit to 30-50mg / Nm 3 , promoting ultra-low emissions. Therefore, in order to meet the requirements, a product that can achieve low NO x Emissions of new burners for LNG gasifiers. Summary of the Invention

[0005] The main purpose of the present invention is to provide a new low-nitrogen burner suitable for a peak-shaving LNG gasifier to solve the above problems.

[0006] To achieve the above-mentioned object, the present invention provides a novel low-nitrogen burner suitable for a peak-shaving LNG gasifier, comprising:

[0007] A burner body, wherein the interior of the burner body is hollow and both ends are open;

[0008] a burner nozzle, the burner nozzle being arranged at the top of the burner body, the first end of the burner nozzle being in communication with the outside, the second end of the burner nozzle being in communication with the burner body, and the diameter of the first end of the burner nozzle being smaller than the diameter of the second end;

[0009] an air pipe, the air pipe being arranged at the bottom of the burner body and communicating with the burner body;

[0010] A fuel gas pipe is provided in the air pipe and is communicated with the air pipe.

[0011] Furthermore, a plurality of burners are evenly distributed on the fuel gas pipe, and the fuel gas pipe is connected to the air pipe through the burners.

[0012] Furthermore, the burner includes a fuel gas branch pipe and a Coanda body; the fuel gas branch pipe is arranged on the side wall of the fuel gas pipe and is perpendicular to the axis of the fuel gas pipe; the first end of the Coanda body is connected to the fuel gas branch pipe, and the second end is bent and forms a certain angle with the first end.

[0013] Furthermore, a plurality of swirl plates are provided on the inner wall of the fuel gas pipe, and the plurality of swirl plates are evenly distributed along the circumference of the fuel gas pipe.

[0014] Furthermore, a plurality of air supply pipes are provided on the side wall of the burner body, and the air supply pipes are perpendicular to the axis of the burner body.

[0015] Furthermore, the burner body and the burner nozzle are integrally formed.

[0016] Furthermore, the fuel gas pipe and the air pipe are coaxially arranged.

[0017] The present invention strengthens the mixing of fuel gas and air by coaxially arranging the fuel gas pipe and the air pipe. The mixing of fuel gas and air is further strengthened by the Coanda effect, thereby improving the combustion efficiency and burnout rate. At the same time, the flue gas internal circulation technology is used to promote the deep oxidation of incompletely burned hydrocarbons and carbon monoxide, greatly improving the burnout rate. The staged combustion technology greatly reduces NO X Generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an overall schematic diagram of a new low-nitrogen burner suitable for a peak-shaving LNG gasifier according to the present invention.

[0019] Figure 2 This is a schematic diagram of a new low-nitrogen burner air supply pipe suitable for a peak-shaving LNG gasifier according to the present invention.

[0020] Figure 3 This is a schematic diagram of a fuel gas pipe of a new low-nitrogen burner suitable for a peak-shaving LNG gasifier according to the present invention.

[0021] Figure 4 This is a schematic diagram of a new type of low-nitrogen burner swirl plate suitable for a peak-shaving LNG gasifier according to the present invention.

[0022] Among them, 1-burner nozzle, 2-burner body, 3-air supply pipe, 4-fuel gas pipe, 5-burner nozzle, 6-swirl plate, 7-air pipe. DETAILED DESCRIPTION

[0023] In order to achieve the above-mentioned objectives and effects, the technical means and structures adopted by the present invention are described in detail with reference to the accompanying drawings for the features and functions of the preferred embodiments of the present invention.

[0024] like Figure 1-Figure 4 As shown, the present invention provides a new low-nitrogen burner suitable for a peak-shaving LNG gasifier, comprising:

[0025] The burner body 2 is hollow inside and has openings at both ends;

[0026] A burner nozzle 1 is provided at the top of a burner body 2. A first end of the burner nozzle 1 is in communication with the outside, and a second end of the burner nozzle 1 is in communication with the burner body 2. The diameter of the first end of the burner nozzle 1 is smaller than that of the second end, and the burner nozzle 1 is in a truncated cone shape.

[0027] An air pipe 7 is provided at the bottom of the burner body 2 and is in communication with the burner body 2. The other end of the air pipe 7 is connected to an air source to provide air to the burner body 2.

[0028] The fuel gas pipe 4 is nested in the air pipe 7. The first end of the fuel gas pipe 4 is connected to the air pipe 7, and the second end is connected to the fuel gas source, thereby providing fuel gas to the air pipe 7, so that the fuel gas enters the burner body 2 after mixing with the air.

[0029] In this embodiment, multiple burners 5 are evenly distributed on the fuel gas pipe 4, which is connected to the air pipe 7 through the burners 5. The coupling of the jets from the multiple burners 5 and the air swirl achieves breakthrough optimization in molecular mixing and flow field organization, thereby improving the mixing rate and adequacy of the fuel gas and air.

[0030] Specifically, the burner 5 includes a fuel gas branch pipe and a coanda body; the fuel gas branch pipe is arranged on the side wall of the fuel gas pipe 4 and is perpendicular to the axis of the fuel gas pipe 4; the first end of the coanda body is connected to the fuel gas branch pipe, and the second end is bent and forms a certain angle with the first end.

[0031] Specifically, the diameter of the second end of the coanda body gradually increases in a direction away from the first end, and the cross-section of the coanda body is circular.

[0032] When a fluid flows over a curved surface, it curves along it. If the radius of curvature of the fluid flow is greater than the radius of curvature of the wall, the fluid near the wall expands, creating negative pressure. The positive pressure fluid away from the wall pushes the fluid near the wall toward it, resulting in the so-called Coanda effect. When fuel gas is ejected from the fuel gas branch pipe and passes through the Coanda body, the Coanda effect allows the fuel gas to mix better and faster with the air while entraining several times more air, greatly improving combustion efficiency.

[0033] In this embodiment, a plurality of swirl plates 6 are provided on the inner wall of the fuel gas pipe 4 , and the plurality of swirl plates 6 are evenly distributed along the circumference of the fuel gas pipe 4 .

[0034] Specifically, the swirl sheet 6 is a rectangular parallelepiped or a regular polyhedron.

[0035] Specifically, the swirl blades 6 need to rotate radially, with a rotation angle of 5° to 45°.

[0036] Due to the presence of the swirl blades 6, the jet action of the burner 5 will form a synergistic effect with the centrifugal force field generated by the swirl. The swirling air will generate a strong rotational flow in the combustion chamber, inducing the fuel jet to diffuse radially, and the axial-tangential momentum of the fuel gas and the air will be superimposed to form a high shear turbulence zone, which greatly increases the contact area between the fuel gas and the air, sharply reduces the mixing time, and greatly improves the uniformity of the combustible mixture.

[0037] In this embodiment, a plurality of air supply pipes 3 are provided on the side wall of the burner body 2 , and the air supply pipes 3 are perpendicular to the axis of the burner body 2 .

[0038] Specifically, the air supply pipe 3 is cylindrical.

[0039] The air supply pipe 3 can generate a strong swirl field in the burner body, forming a low-pressure recirculation zone in the center of the burner body, sucking part of the flue gas produced by combustion into the flame and burning it together with the unburned gas mixture, so that the flue gas is mixed and the oxygen concentration is diluted, while the local flame temperature is reduced, which directly suppresses the thermodynamic NO X At the same time, the flue gas circulating in the flue gas has a high specific heat capacity, which can slow down the combustion rate, thereby prolonging the residence time of the fuel gas in the high temperature area, promoting the deep oxidation of incompletely burned hydrocarbons and carbon monoxide, and greatly improving the burnout rate. At the same time, due to the combination of the fuel gas jet and the flue gas circulation, a situation of oxygen-poor center and rich combustion at the periphery can be formed, achieving staged combustion and greatly reducing NO X Generation.

[0040] In this embodiment, the burner body 2 and the burner nozzle 1 are integrally formed, thereby ensuring the stability and reliability of the device structure.

[0041] In this embodiment, the fuel gas pipe 4 is coaxially arranged with the air pipe 7 to ensure that the air flows around the fuel gas pipe 4 evenly.

[0042] The above descriptions are only preferred embodiments of the present invention, not all embodiments. Anyone should be aware that any structural changes made under the guidance of the present invention, and any technical solutions that are the same or similar to those of the present invention, fall within the scope of protection of the present invention.

Claims

1. A new type of low nitrogen burner suitable for peak-shaving LNG gasifier, characterized by: include: A burner body (2), wherein the burner body (2) is hollow inside and has openings at both ends; A burner nozzle (1), the burner nozzle (1) being arranged at the top of the burner body (2), the first end of the burner nozzle (1) being in communication with the outside, the second end of the burner nozzle (1) being in communication with the burner body (2), the diameter of the first end of the burner nozzle (1) being smaller than the diameter of the second end; an air pipe (7), the air pipe (7) being arranged at the bottom of the burner body (2) and communicating with the burner body (2); A fuel gas pipe (4), wherein the fuel gas pipe (4) is arranged in the air pipe (7), and the fuel gas pipe (4) is communicated with the air pipe (7).

2. A novel low-nitrogen burner suitable for a peak-shaving LNG gasifier according to claim 1, characterized in that: A plurality of burners (5) are evenly distributed on the fuel gas pipe (4), and the fuel gas pipe (4) is connected to the air pipe (7) through the burners (5).

3. The novel low-nitrogen burner suitable for a peak-shaving LNG gasifier according to claim 2, characterized in that: The burner (5) comprises a fuel gas branch pipe and a coanda body; the fuel gas branch pipe is arranged on the side wall of the fuel gas pipe (4) and is perpendicular to the axis of the fuel gas pipe (4); the first end of the coanda body is connected to the fuel gas branch pipe, and the second end is bent and forms a certain angle with the first end.

4. A novel low-nitrogen burner suitable for a peak-shaving LNG gasifier as claimed in claim 3, characterized in that: A plurality of swirl sheets (6) are provided on the inner wall of the fuel gas pipe (4), and the plurality of swirl sheets (6) are evenly distributed along the circumference of the fuel gas pipe (4).

5. The novel low-nitrogen burner suitable for a peak-shaving LNG gasifier according to claim 1, characterized in that: A plurality of air supply pipes (3) are provided on the side wall of the burner body (2), and the air supply pipes (3) are perpendicular to the axis of the burner body (2).

6. A novel low-nitrogen burner suitable for a peak-shaving LNG gasifier according to any one of claims 1 to 5, characterized in that: The burner body (2) and the burner nozzle (1) are integrally formed.

7. A novel low-nitrogen burner suitable for a peak-shaving LNG gasifier according to claim 6, characterized in that: The fuel gas pipe (4) and the air pipe (7) are coaxially arranged.

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