A firebox assembly for a firebox furnace

Abstract

This invention relates to a premixed burner assembly, comprising a burner plate (1) and a flame guide plate (2). The burner plate (1) has multiple grooves spaced apart, each groove containing multiple main burner holes (11) and flame stabilizing holes (12). The flame stabilizing holes (12) are located outside the main burner holes (11). The flame guide plate (2) has multiple flanged holes spaced apart, corresponding to the grooves, with gaps between the flanged holes and the burner plate (1). Compared with the prior art, this invention enhances the flame stabilization effect of the flame stabilizing holes and improves combustion stability.

Description

Technical Field

[0001] This invention relates to the field of fully premixed burner technology, and in particular to a flame-grate type fully premixed burner assembly. Background Technology

[0002] Currently, fully premixed combustion technology is being gradually adopted by the gas industry due to its advantages of high efficiency and low emissions, and it has a promising future. However, most fully premixed burners are currently cylindrical, hemispherical, or flat-plate types, and generally, one size can accommodate several power ranges; for example, a 50kW cylindrical burner can be used with fully premixed burners ranging from 20-70kW. This structural compatibility leads to material and component waste in some units, and also limits the overall size of the burner. Burner-type fully premixed burners are easier to assemble into fully premixed burner modules with different power outputs, thus overcoming the aforementioned disadvantages of fully premixed burners with greater flexibility. However, the burner volume is small, and achieving stable combustion requires a small area for the burner openings, making it technically challenging to achieve a certain power output and stable combustion. Summary of the Invention

[0003] The purpose of this invention is to provide a flame-grate type fully premixed burner assembly to improve combustion stability.

[0004] The objective of this invention can be achieved through the following technical solution: a fire-grate type fully premixed burner assembly, comprising a fire-grate plate and a flame guide plate; The flame plate is provided with multiple grooves at intervals, and each groove is provided with multiple main flame holes and flame stabilizing holes. The flame stabilizing holes are located outside the main flame holes. The flame guide plate is provided with multiple flanged holes corresponding to the grooves at intervals, and a gap is left between the flanged holes and the flame plate.

[0005] Preferably, the height difference between the bottom plane of the groove and the plane of the fire hole plate is 1.2-1.8mm.

[0006] Preferably, the main fire hole is a frustum in shape with a cylindrical hole inside, perpendicular to the bottom plane of the groove. The height of the frustum is 1 / 2 to 2 / 3 of the groove depth, and the height of the frustum of each main fire hole is consistent.

[0007] More preferably, the diameter of the cylindrical hole is 0.3-0.6 mm.

[0008] More preferably, the outer taper of the frustum is 1-0.5°.

[0009] Preferably, the distance between the centers of adjacent main fire holes is 2-4 mm.

[0010] Preferably, each groove is a rectangular groove.

[0011] More preferably, the groove has a length of 8-12 mm and a width of 5-8 mm.

[0012] Preferably, each groove has 6 main flame holes, with the middle 4 main flame holes forming a square matrix, and the other 2 main flame holes located on both sides of the main flame hole square along the length of the groove, centered on the length axis of the groove.

[0013] Preferably, the flame stabilizing hole is opened at the edge of the bottom plane of the groove, the opening direction is parallel to the upper plane of the flame hole plate, and it is a rectangular hole with a width of 0.3-0.5mm and a length of 2-3mm.

[0014] Preferably, each groove has 8 flame stabilizing holes, with 3 flame stabilizing holes evenly distributed along the long side of the groove and 1 flame stabilizing hole on each short side of the groove.

[0015] Preferably, the flanged holes correspond one-to-one with the grooves, and the size of the flanged holes is smaller than that of the grooves.

[0016] More preferably, the difference in lateral dimension between the flanged hole and the groove is 0.6mm-1.0mm, and the flange height is 1-1.4mm.

[0017] Preferably, the distance between the bottom of the flange hole and the bottom plane of the groove is 0.2-0.4 mm.

[0018] Preferably, the fire hole plate has a first side plate and a second side plate on both sides, and the upper edges of the first side plate and the second side plate are tightly attached to the flame guide plate.

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention enhances the flame stabilization effect of the flame stabilizing holes and improves combustion stability by combining the flame guide plate and the flame hole plate.

[0020] 2. By setting the gap between the flanged hole on the flame guide plate and the flame hole plate, the present invention can accelerate the air-fuel mixture flow rate in the flame stabilizing hole, avoid the backfire tendency when adjusting the minimum heat load, and increase the heat load adjustment range.

[0021] 3. The main burner holes of this invention are arranged in a matrix, consisting of four holes. Flame stabilization is achieved by flame-stabilizing holes on the long side of the groove. At each end of the central burner hole assembly, there is a main burner hole, whose flame stabilization is achieved by flame-stabilizing holes on the short side of the groove. The central burner hole assembly concentrates the flame, resulting in a higher flame with a higher central temperature. Unburned combustion gas flowing from the flame-stabilizing holes can be catalytically burned at high temperature, achieving complete combustion. The burner holes at both ends of the central burner hole assembly primarily serve to transfer flame between the various grooved burner hole units throughout the burner and to regulate the uniformity of the flame.

[0022] 4. This invention achieves a large output of combustion power on a smaller flame plate, with stable flame, normal flue gas emission, reduced noise, and expanded heat load adjustment range.

[0023] 5. This invention is the first in the field of burners to adopt a combined flame hole, which overcomes many technical problems between the main flame and the flame stabilizer, enabling the grate-type fully premixed burner to meet the technical requirements of a fully premixed burner, and solving key technical problems for the application of the grate-type fully premixed burner.

[0024] 6. The flame stabilizing hole of the present invention is set at the bottom of the groove, and the airflow flows out perpendicular to the bottom of the groove. It is easy to process, and the airflow in the flame stabilizing hole is guided by the flame guide plate and the side plate, which guides the flame stabilizing flame to the root of the main flame, resulting in a good flame stabilizing effect. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the fire-grate type fully premixed burner assembly of the present invention; Figure 2 This is a partial structural schematic diagram of the perforated plate of the present invention; Figure 3 This is a schematic diagram illustrating the working principle of the present invention; In the diagram: 1-flame hole plate, 11-main flame hole, 12-flame stabilizing flame hole, 2-flame guide plate, 3-first side plate, 4-second side plate, 5-main flame, 6-flame stabilizing flame, 7-main flame combustion gas, 8-flame stabilizing combustion gas. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0027] Example 1 A premixed burner assembly includes a burner plate 1 and a flame guide plate 2. The burner plate 1 has multiple grooves spaced along its length, each groove containing multiple main burner holes 11 and flame stabilizing holes 12. The flame stabilizing holes 12 are located outside the main burner holes 11. The flame guide plate 2 has multiple flanged holes spaced along its length, corresponding to the grooves, forming a flow guide gap between the flanged holes and the burner plate 1 that communicates with the flame stabilizing holes 12.

[0028] Example 2 A premixed burner assembly with a flame guide plate 2 has a 0.2-0.4 mm gap between the bottom plane (bottom plane of the groove) of the flame guide plate 2 and the flame hole plate 1. This gap communicates with the flame stabilizing hole 12 and restricts the flow direction of the air-fuel mixture (flame stabilizing gas 8) in the flame stabilizing hole 12, forcing it to flow out through the gap. The main flame hole 11 is shaped like a frustum, with a cylindrical hole inside. The cylindrical hole is perpendicular to the bottom plane of the groove, and the main flame gas 7 flows out of the main flame hole 11 through the cylindrical hole and then burns. The rest is the same as in Embodiment 1.

[0029] Example 3 A type of fully premixed burner assembly, such as Figure 1 As shown, it includes a flame hole plate 1, a main flame hole 11, a flame stabilizing flame hole 12, a flame guide plate 2, a first side plate 3, and a second side plate 4.

[0030] Ten rectangular grooves are provided along the length of the flame orifice plate 1. The height difference between the bottom plane of each groove and the plane of the flame orifice plate 1 is 1.2-1.8mm, which can be adjusted according to the power of the flame-grate type premixed burner. This groove is designed to accumulate heat at the root of the flame in the main flame orifice 11, so that the gas flows out of the main flame orifice 11 and burns immediately, thus achieving partial flame stabilization.

[0031] like Figure 2 As shown, six main flame holes 11 are set in each groove, with four main flame holes 11 forming a square matrix in the middle, and the other two main flame holes 11 located on both sides of the main flame hole matrix along the length of the groove, centered on the axis of the groove's length. This ensures the uniformity of heat concentration throughout the groove and the main flame 5 (see...). Figure 3 They gather in the center of the groove.

[0032] Eight flame stabilizing holes 12 are provided in each groove, with three flame stabilizing holes 12 evenly distributed along the long side of the groove and one flame stabilizing hole 12 provided on each short side of the groove.

[0033] The main fire hole 11 in the groove is a conical boss with a cylindrical hole inside, perpendicular to the bottom plane of the groove. The height of the boss is 1 / 2 to 2 / 3 of the groove depth, and the height of the boss remains constant.

[0034] The opening direction of the flame stabilizing hole 12 within the groove is parallel to the upper plane of the flame orifice plate 1. The flame stabilizing hole 12 is a rectangular hole with a width of 0.3-0.5 mm and a length of 2-3 mm. When the gas flows out of the flame stabilizing hole 12, the gas is ignited, and the flame burns directly towards the main flame 5 (see...). Figure 3 ).

[0035] To ensure the stabilizing flame 6 of the flame stabilizing hole 12 is completely close to the root of the main flame 5 and to guarantee the flame stabilization effect, a flame guide plate 2 is provided in this embodiment. The function of the flame guide plate 2 is explained below. Figure 3When the fuel gas flows out of the flame stabilizing hole 12, without the flame guide plate 2, the flame will burn at an angle of 45-75° to the bottom plane of the groove, reducing the contact area with the main flame 5 and resulting in poor flame stabilization. Moreover, since the flow rate of the fuel gas-air mixture is relatively fast during fully premixed combustion, it will cause the main flame 5 to flicker and CO to rise, affecting combustion stability and flue gas emission requirements, and reducing thermal efficiency. Therefore, the flame guide plate 2 is provided in this embodiment.

[0036] Ten rectangular flanged holes are provided along the length of the flame guide plate 2. The size of the flanged holes is 0.8mm smaller than the groove size of the flame hole plate 1, and the flange height is 1-1.4mm.

[0037] There is a 0.2-0.4mm gap between the flame guide plate 2 and the bottom plane of the flame orifice plate 1. This gap restricts the flow direction of the air-fuel mixture in the flame stabilizing orifice 12, forcing it to flow out through the gap. This avoids the problems mentioned above, such as the small contact area between the flame stabilizing flame 6 and the main flame 5 affecting the flame stabilization effect, combustion efficiency, and flue gas emissions.

[0038] Due to the effect of this gap, the air-fuel gas flowing out of the gap accelerates. After the air-fuel gas flowing out of the gap is ignited, the flame directly contacts the root of the main flame 5, forming a stable flame 6.

[0039] For the reasons mentioned above, the air-fuel mixture flow rate of the flame stabilizer hole is increased, which avoids the backfire tendency when adjusting the minimum heat load and increases the heat load adjustment range.

[0040] The first side plate 3 and the second side plate 4 form the frame that encloses the flame guide plate 2 of the above-described flame grid type premixed burner assembly. The flame guide plate 2 is tightly attached to the upper edge of the first side plate 3 and the second side plate 4.

[0041] The sides of the first side plate 3 and the second side plate 4 are closely attached to the four sides of the fire-grate type fully premixed burner assembly.

[0042] The lower sides of the first side plate 3 and the second side plate 4 form a secondary mixing air inlet and a static pressure chamber below the burner assembly with the main body of the burner.

[0043] The performance of the grate-type fully premixed burner assembly of this embodiment was tested and applied to a grate-type fully premixed burner. The measured performance parameters are as follows: 1. The heat load is adjustable between 1.5-4.6kw.

[0044] 2. Carbon monoxide in flue gas is 20-80 ppm.

[0045] 3. NOx in flue gas < 30 mg / kw.h.

[0046] This invention achieves a combined structure that was impossible with conventional fully premixed burners, enabling the output of greater combustion power on a smaller flame plate, resulting in stable flame, normal flue gas emissions, reduced noise, and an expanded range of heat load adjustment.

[0047] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A firebox premix port assembly, comprising: Includes a fire hole plate (1) and a flame guide plate (2); The fire hole plate (1) is provided with a plurality of grooves at intervals, and each groove is provided with a plurality of main fire holes (11) and flame stabilizing fire holes (12). The flame stabilizing fire holes (12) are located outside the main fire holes (11). The flame guide plate (2) is provided with a plurality of flanged holes corresponding to the grooves at intervals, and a gap is left between the flanged holes and the fire hole plate (1). The flanged holes and grooves correspond one-to-one, and the size of the flanged holes is smaller than that of the grooves.

2. The firebox full premix burner assembly of claim 1, wherein, The height difference between the bottom plane of the groove and the plane of the fire hole plate (1) is 1.2-1.8mm.

3. The firebox full premix burner assembly of claim 1, wherein, The main fire hole (11) is a frustum in shape and a cylindrical hole inside, perpendicular to the bottom plane of the groove. The height of the frustum is 1 / 2 to 2 / 3 of the groove depth, and the height of the frustum of each main fire hole (11) is consistent.

4. The firebox full premix burner assembly of claim 1, wherein, Six main flame holes (11) are set in each groove. The four main flame holes (11) in the middle form a square matrix, and the other two main flame holes (11) are located on both sides of the main flame hole square in the length direction of the groove, and are centered on the length axis of the groove.

5. The firebox full premix burner assembly of claim 1, wherein, The flame stabilizing hole (12) is opened on the edge of the bottom plane of the groove, and the opening direction is parallel to the upper plane of the flame hole plate (1). It is a rectangular hole with a width of 0.3-0.5mm and a length of 2-3mm.

6. The firebox full premix burner assembly of claim 1, wherein, Eight flame stabilizing holes (12) are provided in each groove, three flame stabilizing holes (12) are evenly distributed along the long side of the groove, and one flame stabilizing hole (12) is provided on each short side of the groove.

7. The firebox full premix burner assembly of claim 1, wherein, The difference in lateral dimension between the flanged hole and the groove is 0.6mm-1.0mm, and the flange height is 1-1.4mm.

8. The firebox full premix burner assembly of claim 1, wherein, The distance between the bottom of the flange hole and the bottom plane of the groove is 0.2-0.4mm.

9. The firebox full premix burner assembly of claim 1, wherein, The fire hole plate (1) has a first side plate (3) and a second side plate (4) on both sides, and the upper edges of the first side plate (3) and the second side plate (4) are tightly attached to the flame guide plate (2).

Images