Furnace mouth air sleeve structure

Abstract

The utility model discloses a furnace mouth air sleeve structure which comprises a front feeding pipe, an annular air sleeve and a rear feeding pipe. The front feeding pipe penetrates through an inner ring of the annular air sleeve; an annular cavity is formed in the annular air sleeve, and two symmetrical baffles are arranged in the middle of the annular cavity and divide the annular cavity into an upper air cavity and a lower air cavity. An upper air inlet pipe is arranged at the top of the upper air cavity; a lower air inlet pipe is arranged at the bottom of the lower air cavity; a vertically downward air supply pipe is arranged at the top of the feeding channel and is communicated with the upper air cavity; air outlet holes are formed in the cavity wall of the lower air cavity in the discharging direction; the rear feeding pipe is in butt joint with the discharging direction side of the annular air sleeve, and a feeding side pipe opening of the rear feeding pipe covers the feeding channel and the air outlet hole. According to the scheme, the sealing air is arranged at the furnace mouth to generate positive pressure at the furnace mouth, so that the fire and smoke return problem of the boiler is solved; and meanwhile, feeding air is arranged to blow away extrusion materials fed by the material conveying screw, sufficient and stable combustion in the furnace is achieved, and the problems that the oxygen content is unstable, nitric oxide exceeds the standard and combustion is unstable are solved.

Description

Technical Field

[0001] This utility model relates to the technical field of power plant feeding equipment, and in particular to a furnace mouth air jacket structure. Background Technology

[0002] In the current boiler equipment field, the structural design of the furnace opening plays a crucial role in the stable operation and efficient combustion of the boiler. Existing furnace opening air jacket structures have many problems that urgently need to be addressed.

[0003] First, many traditional furnace inlet air jackets lack effective sealing air settings, making it impossible to create positive pressure at the furnace inlet. This makes the boiler highly susceptible to backfire and backflow during operation. Backfire and backflow not only threaten the safety of operators but also cause serious pollution to the working environment, affecting workplace air quality and endangering the health of workers.

[0004] Secondly, the existing furnace inlet air jacket structure makes it difficult to achieve reasonable setting of the feeding air, and cannot effectively disperse the extruded material delivered by the conveying screw. This results in uneven fuel distribution and incomplete combustion within the furnace, leading to unstable oxygen levels and an unstable combustion process. This unstable combustion state not only reduces the boiler's thermal efficiency and increases energy consumption, but may also cause the oxides produced during combustion to fail to meet standard requirements, causing environmental pollution.

[0005] In summary, the existing furnace inlet air jacket structure has obvious defects in sealing and feeding, which seriously affects the normal operation and environmental performance of the boiler. There is an urgent need for a new furnace inlet air jacket structure to solve these problems. Utility Model Content

[0006] To address the problems existing in the prior art, the purpose of this utility model is to: create positive pressure at the furnace opening by setting a sealing air (gate air) to solve the problem of boiler backfire and back smoke; at the same time, set a feeding air to disperse the extruded material sent by the conveying screw, so as to achieve full and stable combustion in the furnace, solve the problems of unstable oxygen content and unstable combustion, and ensure that the oxides produced by combustion meet the standard requirements.

[0007] The technical solution adopted by this utility model to solve its technical problem is:

[0008] The furnace mouth air sleeve structure includes: a front feeding pipe, an annular air sleeve, and a rear feeding pipe; the pipe body of the front feeding pipe passes through the inner ring of the annular air sleeve, forming a feeding channel inside it; the annular air sleeve has an annular cavity, and two symmetrical baffles are provided in the middle of the annular cavity, dividing it into an upper air cavity and a lower air cavity that are not connected to each other; an upper air inlet pipe is provided at the top of the upper air cavity; a lower air inlet pipe is provided at the bottom of the lower air cavity; several vertically downward air supply pipes are provided at the top of the feeding channel of the annular air sleeve, and the air supply pipes are connected to the upper air cavity; several air outlet holes are provided on the cavity wall of the lower air cavity in the discharge direction; the rear feeding pipe is connected to the discharge direction side of the annular air sleeve, and its inlet side covers the feeding channel and air outlet holes of the annular air sleeve.

[0009] In a further optimized technical solution, the front feed pipe is provided with a flange for docking with upstream equipment along the feed direction pipe.

[0010] Further optimization of the technical solution involves equidistantly arranged air supply pipes on the same vertical plane perpendicular to the feeding direction.

[0011] In a further optimized technical solution, the air outlets are all equidistantly distributed along the inner ring line of the lower air cavity.

[0012] The beneficial effects of this utility model are:

[0013] 1. Superior sealing performance: By setting a positive pressure through sealing air, it effectively prevents boiler backfire and back smoke, greatly improving operational safety, improving the working environment, and reducing health hazards to operators.

[0014] 2. Optimize the combustion process: The feeding air design can disperse the extruded material, making the fuel in the furnace evenly distributed, significantly improving the combustion completeness, stabilizing the oxygen content, ensuring the stability of the combustion process, thereby improving the boiler thermal efficiency, preventing nitrogen oxides from exceeding the standard, and reducing energy consumption.

[0015] 3. Meets environmental protection requirements: Stable and complete combustion ensures that the oxides produced by combustion meet the standard requirements, reducing pollution to the environment and conforming to the concept of environmental protection. Attached Figure Description

[0016] Figure 1 This is a side sectional view of the structure of this utility model.

[0017] Figure 2 This is a front view of the feed end of the structure of this utility model.

[0018] Figure 3 This is a front view of the discharge end of the structure of this utility model.

[0019] In the diagram: 1-front feeding pipe, 2-annular air sleeve, 3-rear feeding pipe, 101-flange, 201-feeding channel, 202-baffle, 203-upper air chamber, 204-lower air chamber, 205-upper air inlet pipe, 206-lower air inlet pipe; 207-air supply pipe, 208-air outlet. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] The furnace inlet air jacket structure provided in this embodiment is as follows: Figure 1-3 As shown, it is specifically composed of the following components and connections:

[0022] The front feed pipe 1 has a flange 101 along its feed direction for connecting to the upstream conveying screw conveyor; its pipe body passes through the inner ring of the annular air sleeve 2, forming a feed channel 201 inside.

[0023] The annular wind sleeve 2 has an annular cavity inside, which is divided into an independent upper wind cavity 203 and lower wind cavity 204 by two symmetrical baffles 202 that are welded and fixed.

[0024] The rear feeding pipe 3 has its inlet 301 covering the feeding channel 201 and the air outlet 208 area of ​​the annular air sleeve 2.

[0025] The upper air chamber 203 is connected to the upper air inlet pipe 205 at the top, and the lower air chamber 204 is connected to the lower air inlet pipe 206 at the bottom.

[0026] The top of the annular air sleeve 2 is provided with 6 vertically downward air supply pipes 207, which are equidistantly arranged on the same vertical plane perpendicular to the feeding direction and are connected to the upper air chamber 203.

[0027] Eight air outlets 208 are equidistantly arranged in the inner ring of the lower air cavity 204, forming an arc-shaped array.

[0028] How the technical effect is achieved:

[0029] (1) The independent upper and lower air chambers 203 and 203 formed by the baffle 204 can be supplied with sealing air and feeding air independently through the upper air inlet pipe 205 and the lower air inlet pipe 206 respectively, avoiding mutual interference of airflow and realizing independent control of dual air paths.

[0030] (2) The vertical arrangement of the air supply duct 207 allows the airflow to impact the material flow vertically, improving the uniformity of fuel dispersion, and forming a positive pressure air curtain above the material, effectively preventing boiler backfire and back smoke.

[0031] (3) The air outlets 208 are arranged in an arc-shaped array, from which the feeding air is blown out. The feeding air can disperse the extruded material, making the fuel in the furnace evenly distributed, significantly improving the combustion efficiency, stabilizing the oxygen content, and ensuring a stable combustion process.

[0032] Workflow: During operation, sealing air enters the upper air chamber 203 through the upper air inlet pipe 205 and is sprayed vertically downwards through the air supply pipe 207, forming a positive pressure air curtain at the inlet of the feeding channel 201, effectively preventing the leakage of flue gas from the furnace; feeding air enters the lower air chamber 204 through the lower air inlet pipe 206 and forms an inclined backward airflow through the air outlet 208, dispersing the extruded material conveyed by the conveying screw to the front feeding pipe 1 and sending it into the rear feeding pipe 3. The flange 101 ensures reliable docking with the upstream equipment, and the flared design of the rear feeding pipe 3 simultaneously receives the dispersed material and the sealing airflow, forming a complete sealing-feeding collaborative system.

[0033] It should be noted that, in this document, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A furnace mouth air jacket structure, characterized in that, It includes a front feeding pipe, an annular air sleeve, and a rear feeding pipe; the pipe body of the front feeding pipe passes through the inner ring of the annular air sleeve, forming a feeding channel inside it; the annular air sleeve has an annular cavity, and two symmetrical baffles are provided in the middle of the annular cavity, dividing it into an upper air cavity and a lower air cavity that are not connected to each other; an upper air inlet pipe is provided at the top of the upper air cavity; a lower air inlet pipe is provided at the bottom of the lower air cavity; several vertically downward air supply pipes are provided at the top of the feeding channel, and the air supply pipes are connected to the upper air cavity; several air outlets are provided on the cavity wall of the lower air cavity in the discharge direction; the rear feeding pipe is connected to the discharge direction side of the annular air sleeve, and its inlet side covers the feeding channel and air outlets of the annular air sleeve.

2. The furnace mouth air jacket structure as described in claim 1, characterized in that, The front end of the feed pipe is provided with a flange for connecting to the upstream equipment.

3. The furnace mouth air jacket structure as described in claim 1, characterized in that, The air supply pipes are all arranged equidistantly on the same vertical plane perpendicular to the feeding direction.

4. The furnace mouth air jacket structure as described in claim 1, characterized in that, The air outlets are all equidistantly distributed along the inner ring of the lower air cavity.

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