Preheater adopting staged combustion

Abstract

The utility model relates to the technical field of combustion equipment, in particular to a preheater adopting staged combustion. According to the technical scheme, the preheater adopting staged combustion comprises an air inlet pipe, a shell, an air return pipe and a guide plate, the guide plate is arranged in the shell, the air inlet pipe is arranged at one end of the shell, an air outlet pipe is arranged at the end, away from the air outlet pipe, of the shell, and a through hole is formed in the end, close to the air outlet pipe, of the shell in a penetrating mode; an annular gas distribution pipe is installed at the end, close to the gas inlet pipe, of the interior of the shell, a spray head is installed on the annular gas distribution pipe, the annular gas distribution pipe is communicated with the through hole through a gas return pipe, and an annular combustor and foamed ceramic are installed in the shell. According to the utility model, the utilization rate of heat in the tail gas after combustion can be increased, and the combustion of fuel can be more sufficient.

Description

Technical Field

[0001] The utility model relates to the technical field of combustion equipment, in particular to a preheater adopting staged combustion. Background Art

[0002] Staged combustion is a technology that burns fuel in different combustion zones to different degrees. It is widely used in combustion equipment such as industrial furnaces and boilers to improve combustion efficiency and reduce pollutant emissions.

[0003] In the traditional combustion process, the fuel is completely burned in a single combustion zone, resulting in uneven distribution of temperature and oxygen concentration, which makes the combustion efficiency low and produces a large amount of pollutants. Staged combustion sets multiple combustion zones in the combustion equipment, so that the fuel is burned in different zones in stages.

[0004] The main principle of staged combustion is to divide the fuel into multiple parts and burn them one by one in different combustion zones to achieve the step-by-step advancement of the combustion process. Usually, staged combustion equipment will have different combustion zones such as pre-combustion zone, main combustion zone and waste heat utilization zone.

[0005] The pre-combustion zone is used to preheat the fuel at a lower temperature and guide the gas flow to the main combustion zone. The main combustion zone is the main area for achieving complete combustion of the fuel. Through good oxygen supply and mixing, the fuel is burned efficiently and releases more heat energy. The waste heat utilization zone is used to make full use of the heat energy in the high-temperature flue gas generated after combustion to improve the energy efficiency of the combustion system. However, the existing burners cannot fully burn the fuel and cannot make full use of the waste heat, which in turn affects the efficiency of energy utilization. Utility Model Content

[0006] The utility model provides a preheater adopting staged combustion, which solves the above-mentioned technical problems.

[0007] The utility model solves the above-mentioned technical problems as follows:

[0008] A preheater using staged combustion comprises an air inlet pipe, an outer shell, an air return pipe and a guide plate, wherein the guide plate is provided inside the outer shell, an air inlet pipe is provided at one end of the outer shell, an air outlet pipe is provided at the end of the outer shell facing away from the air outlet pipe, a through hole is penetrated through the end of the outer shell close to the air outlet pipe, an annular air distribution pipe is installed at the end of the inner shell close to the air inlet pipe, a nozzle is installed on the annular air distribution pipe, the annular air distribution pipe and the through hole are connected through the air return pipe, and an annular burner and foam ceramics are installed inside the outer shell.

[0009] On the basis of the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, there are two foam ceramics in total, and the two foam ceramics are symmetrically distributed on both sides of the annular burner.

[0011] The beneficial effects of adopting the above further scheme are:

[0012] Symmetrically distributed ceramic foams can guide air flow and optimize air circulation inside the annular burner. This helps improve fuel combustion efficiency and reduce the generation of incompletely burned exhaust gas. By symmetrically distributing two ceramic foams on both sides of the annular burner, it is possible to balance the heat and mechanical loads and reduce unsafe factors caused by local overheating or mechanical stress concentration. In addition, the symmetrical distribution design can also improve the anti-seismic performance of the annular burner and reduce the instability caused by vibration.

[0013] Furthermore, ignition heads are evenly installed on the annular burner.

[0014] The beneficial effects of adopting the above further scheme are:

[0015] Evenly installing the ignition heads on the annular burner can make the fuel burn more evenly and avoid incomplete combustion or local overheating. This helps to improve the utilization rate and thermal efficiency of the fuel. Since the ignition heads are evenly distributed on the annular burner, it can be ensured that each ignition head can ignite the fuel at the best position. This helps to improve the efficiency and reliability of ignition, thereby ensuring the stable operation of the annular burner. Since the ignition heads are evenly distributed, the heat and mechanical stress generated during ignition can be dispersed, avoiding damage to the ignition head or failure of the annular burner due to local overheating or stress concentration. This helps to reduce the failure rate and maintenance costs.

[0016] Furthermore, the nozzles are evenly distributed on the annular air distribution pipe, and the exhaust gas after combustion in the shell flows back into the annular air distribution pipe through the through holes and the return air pipe, and is sprayed out through the nozzles, preheating the fuel entering the shell from the intake pipe and increasing the gas pressure and flow rate of the fuel.

[0017] The beneficial effects of adopting the above further scheme are:

[0018] The refluxed exhaust gas is ejected through the nozzle, which can preheat the fuel entering the shell, increase the temperature and pressure of the fuel, thereby reducing the ignition point of the fuel, promoting the full combustion of the fuel, thereby reducing the generation of incompletely burned exhaust gas and reducing pollution emissions. By increasing the pressure and flow rate of the fuel, the flow rate of the fuel can be accelerated, thereby improving the combustion efficiency of the burner. Since the exhaust gas refluxes into the annular gas distribution pipe, the gas pressure and temperature distribution in the annular burner can be balanced, improving the stability and reliability of combustion.

[0019] Furthermore, the fuel entering the housing is guided to the ignition head of the housing through the guide plate.

[0020] The beneficial effects of adopting the above further scheme are:

[0021] The guide plate can accurately guide the fuel into the ignition head, avoiding problems caused by fuel deviation or uneven flow rate. This helps ensure that the fuel ignites at the right time and position, improving combustion efficiency. With the guidance of the guide plate, the fuel can enter the ignition head more stably and burn smoothly there. This helps reduce poor combustion caused by fuel fluctuations or instability, and improves combustion stability and reliability.

[0022] Furthermore, the fuel is evenly distributed at the ignition head through the voids of the foam ceramic, thereby increasing the combustion efficiency.

[0023] The beneficial effects of adopting the above further scheme are:

[0024] The voids in the ceramic foam can ensure that the fuel is evenly distributed at the ignition head, avoiding fuel aggregation or uneven distribution. This helps to improve the combustion efficiency and fuel utilization of the fuel. Through the voids in the ceramic foam, the fuel can be more fully in contact with the air, thereby expanding the contact area, promoting the oxidation reaction of the fuel, and improving the combustion efficiency. The ceramic foam can absorb and disperse the heat from the ignition head, so that the heat is more evenly distributed over the entire fuel surface. This helps to promote uniform combustion of the fuel and improve thermal efficiency. By ensuring uniform combustion of the fuel, the generation of incompletely burned exhaust gas can be reduced, thereby reducing pollution emissions. Due to the support and buffering effect of the ceramic foam, the fuel fluctuation and instability caused by mechanical vibration or impact can be reduced, and the stability and reliability of combustion can be improved. And through the voids in the ceramic foam, the combustion process of the fuel at the ignition head is more uniform and stable, reducing the safety hazards caused by local overheating or fuel aggregation. In addition, the ceramic foam can also provide a certain thermal insulation effect, reduce the impact of heat on surrounding components, and further enhance the safety of the system.

[0025] The beneficial effects of the utility model are:

[0026] By adopting the design of staged combustion and ignition head, the fuel can be burned efficiently and the combustion efficiency can be improved. The fuel can be evenly distributed at the ignition head through the gaps in the foam ceramic, so that it can be burned better.

[0027] The exhaust gas in the preheater flows back to the annular air distribution pipe through the through hole and the return air pipe, and is ejected through the nozzle. This can effectively preheat the fuel entering the preheater, increase its temperature, and improve the combustion effect.

[0028] The preheater guides the exhaust gas from the through hole and the return air pipe to the annular air distribution pipe, and then sprays it out through the nozzle. This can increase the gas pressure and flow rate of the fuel, so that the fuel is mixed with the air more fully, promoting better combustion.

[0029] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiment of the utility model with the accompanying drawings. The specific implementation method of the utility model is given in detail by the following embodiments and their drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0031] In the attached picture:

[0032] Figure 1 This is a schematic diagram of the top view of the utility model;

[0033] Figure 2 This is a schematic diagram of the main structure of the utility model;

[0034] Figure 3 It is a side view schematic diagram of the utility model.

[0035] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0036] 1. Inlet pipe; 2. Shell; 3. Return air pipe; 4. Exit pipe; 5. Nozzle; 6. Guide plate; 7. Annular burner; 8. Foam ceramic; 9. Through hole; 10. Ignition head; 11. Annular air distribution pipe. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] See also Figures 1 to 3 As shown, the embodiments provided by the utility model:

[0039] Embodiment 1

[0040] A preheater using staged combustion includes an air intake pipe 1, a shell 2, an air return pipe 3 and a guide plate 6. The guide plate 6 is provided inside the shell 2. The fuel entering the shell 2 is guided to enter the ignition head 10 of the shell 2 through the guide plate 6. The guide plate 6 can accurately guide the fuel to enter the ignition head 10 to avoid problems caused by fuel deviation or uneven flow rate. This helps to ensure that the fuel is ignited at the right time and position, and improves the combustion efficiency. Through the guidance of the guide plate 6, the fuel can enter the ignition head 10 more stably and burn smoothly there. This helps to reduce poor combustion caused by fuel fluctuations or instability, and improves the stability and reliability of combustion.

[0041] An air inlet pipe 1 is provided at one end of the outer shell 2, an air outlet pipe 4 is provided at the end of the outer shell 2 facing away from the air outlet pipe 4, a through hole 9 is penetrated through the end of the outer shell 2 close to the air outlet pipe 4, an annular air distribution pipe 11 is installed at the end of the inner part of the outer shell 2 close to the air inlet pipe 1, and a nozzle 5 is installed on the annular air distribution pipe 11, and the nozzles 5 are evenly distributed on the annular air distribution pipe 11. The exhaust gas after combustion in the outer shell 2 flows back to the annular air distribution pipe 11 through the through hole 9 and the return air pipe 3, and is sprayed out through the nozzle 5, so as to preheat the fuel entering the outer shell 2 from the air inlet pipe 1 and increase the gas pressure and flow rate of the fuel.

[0042] The annular gas distribution pipe 11 and the through hole 9 are connected through the return gas pipe 3. The refluxed exhaust gas is ejected through the nozzle 5, which can preheat the fuel entering the shell 2, increase the temperature and air pressure of the fuel, thereby reducing the ignition point of the fuel, and promote the full combustion of the fuel, thereby reducing the generation of incompletely burned exhaust gas and reducing pollution emissions. By increasing the air pressure and flow rate of the fuel, the flow rate of the fuel can be accelerated, thereby improving the combustion efficiency of the burner. Since the exhaust gas flows back into the annular gas distribution pipe 11, the gas pressure and temperature distribution in the annular burner 7 can be balanced, and the stability and reliability of combustion can be improved. The annular burner 7 and the foam ceramic 8 are installed inside the shell 2, and the ignition heads 10 are evenly installed on the annular burner 7. The ignition heads 10 are evenly installed on the annular burner 7 to make the fuel more even during combustion, avoiding the situation of incomplete combustion or local overheating. This helps to improve the utilization rate and thermal efficiency of the fuel. Since the ignition heads 10 are evenly distributed on the annular burner 7, it can be ensured that each ignition head 10 can ignite the fuel at the best position. This helps to improve the efficiency and reliability of ignition, thereby ensuring the stable operation of the annular burner 7. Since the ignition head 10 is evenly distributed, the heat and mechanical stress generated during ignition can be dispersed, avoiding damage to the ignition head 10 or failure of the annular burner 7 due to local overheating or stress concentration. This helps to reduce the failure rate and maintenance costs. There are two foam ceramics 8, and the two foam ceramics 8 are symmetrically distributed on both sides of the annular burner 7. The fuel is evenly distributed at the ignition head 10 through the gaps of the foam ceramics 8, thereby increasing the combustion efficiency. The gaps of the foam ceramics 8 can ensure that the fuel is evenly distributed at the ignition head 10, avoiding the occurrence of fuel aggregation or uneven distribution. This helps to improve the combustion efficiency and utilization of the fuel. Through the gaps of the foam ceramics 8, the fuel can be more fully in contact with the air, thereby expanding the contact area, promoting the oxidation reaction of the fuel, and improving the combustion efficiency. The foam ceramics 8 can absorb and disperse the heat from the ignition head 10, so that the heat is more evenly distributed on the entire fuel surface. This helps to promote uniform combustion of the fuel and improve thermal efficiency. By ensuring uniform combustion of the fuel, the generation of incompletely burned exhaust gas can be reduced, thereby reducing pollution emissions. Due to the support and cushioning effect of the foam ceramic 8, the fuel fluctuation and instability caused by mechanical vibration or impact can be reduced, and the stability and reliability of the combustion can be improved. And through the gaps in the foam ceramic 8, the combustion process of the fuel at the ignition head 10 is more uniform and stable, reducing the safety hazards caused by local overheating or fuel accumulation. In addition, the foam ceramic 8 can also provide a certain thermal insulation effect, reduce the impact of heat on surrounding components, and further enhance the safety of the system. At the same time, the symmetrically distributed foam ceramic 8 can guide the air flow and optimize the air circulation inside the annular burner 7. This helps to improve the combustion efficiency of the fuel and reduce the generation of incompletely burned exhaust gas.By symmetrically distributing two foam ceramics 8 on both sides of the annular burner 7, the heat and mechanical load can be balanced, reducing the unsafe factors caused by local overheating or mechanical stress concentration. In addition, the symmetrical distribution design can also improve the anti-seismic performance of the annular burner 7 and reduce the unstable factors caused by vibration.

[0043] A preheater using staged combustion based on Example 1 is used:

[0044] By adopting the design of staged combustion and the ignition head 10, efficient combustion of fuel can be achieved and combustion efficiency can be improved. The fuel can be evenly distributed at the ignition head 10 through the gaps of the foam ceramic 8, so as to be better burned.

[0045] The tail gas in the preheater flows back to the annular air distribution pipe 11 through the through hole 9 and the return air pipe 3, and is ejected through the nozzle 5. In this way, the fuel entering the preheater can be effectively preheated, its temperature can be increased, and the combustion effect can be improved.

[0046] The preheater guides the exhaust gas from the through hole 9 and the return air pipe 3 to the annular air distribution pipe 11, and then sprays it out through the nozzle 5. This can increase the gas pressure and flow rate of the fuel, so that the fuel is more fully mixed with the air, promoting better combustion.

[0047] The above description is only a preferred embodiment of the utility model and does not impose any form of limitation on the utility model. Any ordinary technician in the industry can smoothly implement the utility model as shown in the drawings of the specification and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the utility model using the technical content disclosed above are all equivalent embodiments of the utility model. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the utility model are still within the protection scope of the technical solution of the utility model.

Claims

1. A preheater using staged combustion, characterized in that: The invention comprises an air inlet pipe (1), an outer shell (2), an air return pipe (3) and a guide plate (6); the guide plate (6) is arranged inside the outer shell (2); an air inlet pipe (1) is arranged at one end of the outer shell (2); an air outlet pipe (4) is arranged at the end of the outer shell (2) away from the air outlet pipe (4); a through hole (9) is penetrated through the end of the outer shell (2) close to the air outlet pipe (4); an annular air distribution pipe (11) is installed at the end of the inner shell (2) close to the air inlet pipe (1); a nozzle (5) is installed on the annular air distribution pipe (11); the annular air distribution pipe (11) and the through hole (9) are connected through the air return pipe (3); an annular burner (7) and a foam ceramic (8) are installed inside the outer shell (2).

2. A preheater using staged combustion according to claim 1, characterized in that: There are two foam ceramics (8) in total, and the two foam ceramics (8) are symmetrically distributed on both sides of the annular burner (7).

3. A preheater using staged combustion according to claim 1, characterized in that: Ignition heads (10) are evenly mounted on the annular burner (7).

4. A preheater using staged combustion according to claim 1, characterized in that: The nozzles (5) are evenly distributed on the annular air distribution pipe (11), and the exhaust gas after combustion in the shell (2) flows back into the annular air distribution pipe (11) through the through hole (9) and the return pipe (3), and is sprayed out through the nozzles (5), thereby preheating the fuel entering the shell (2) from the intake pipe (1) and increasing the gas pressure and flow rate of the fuel.

5. A preheater using staged combustion according to claim 1, characterized in that: The fuel entering the housing (2) is guided through the guide plate (6) to the ignition head (10) of the housing (2).

6. A preheater using staged combustion according to claim 1, characterized in that: The fuel is evenly distributed at the ignition head (10) through the gaps in the foam ceramic (8), thereby increasing the combustion efficiency.

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