Efficient self-preheating burner

Abstract

The utility model discloses an efficient self-preheating burner which comprises an air shell, a combustion chamber is arranged in one end of the air shell, and the combustion chamber is communicated with a fire spraying opening. The outer shell is sleeved with the other end of the air shell, and a flue gas backflow channel is reserved between the outer shell and the air shell; an air inlet and a flue gas outlet are formed in the outer shell; the first-stage heat exchanger is arranged on the outer surface of the air shell in a sleeving mode to form an air circulation channel communicated with the combustion chamber. The secondary heat exchanger is arranged in the air shell; the secondary heat exchanger is arranged in the outer shell, the combustion chamber is arranged in the outer shell, the fuel gas shell is arranged at one end of the outer shell, a fuel gas inlet in the fuel gas shell is communicated with the combustion chamber, and the ignition end of the self-cooling electrode is arranged in the combustion chamber. And the air is heated to enter the combustion chamber after being subjected to secondary heat exchange through the primary heat exchanger, so that the temperature of flame sprayed by the burner is increased.

Description

Technical Field

[0001] The utility model relates to a preheating burner, in particular to a high-efficiency self-preheating burner. Background Art

[0002] The preheating burner is a typical industrial furnace burner, which mainly uses countercurrent heat exchanger and high-temperature air combustion technology. The heat exchanger is more widely used and the technical principle is more familiar. The burner acts as both a combustion device and a smoke exhaust device, and performs both functions simultaneously.

[0003] However, most of the current preheating burners are regenerative burners, which use a single-stage heat exchanger for heat exchange. After actual use, it was found that if only one heat exchange is used, the recovery capacity of the flue gas waste heat is poor. At the same time, the structure of the regenerative burner is also more complicated and occupies a larger space, which brings many inconveniences to actual use. Utility Model Content

[0004] The utility model aims to overcome the deficiencies of the prior art and to provide a high-efficiency self-preheating burner with a compact structure, good flue gas waste heat recovery capability, and improved working efficiency of the burner.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a high-efficiency self-preheating burner, comprising:

[0006] An air casing, wherein a combustion chamber is provided inside one end of the air casing, and an outlet of the combustion chamber is connected to a flame ejection port for ejecting flames;

[0007] The outer shell is sleeved in the other end of the air shell, and a smoke return channel is left between the outer shell and the air shell for smoke to enter the inner part of the outer shell; wherein the outer shell is provided with an air inlet and a smoke outlet;

[0008] a primary heat exchanger, sleeved on the outer surface of the air housing, with an air circulation channel for air circulation formed between the primary heat exchanger and the air housing, the air circulation channel communicating with the combustion chamber;

[0009] a secondary heat exchanger, disposed in the outer shell and in communication with the air inlet, the flue gas return channel, and the air circulation channel respectively;

[0010] a gas shell, disposed at one end of the outer shell, the gas shell being in communication with the combustion chamber via a gas conduit for delivering gas into the combustion chamber, and a gas inlet being provided on the gas shell;

[0011] A self-cooling electrode is arranged outside the gas shell, and an ignition end of the self-cooling electrode is arranged in the combustion chamber.

[0012] Furthermore, the first-stage heat exchanger is composed of a plurality of heat exchange fins uniformly attached to the surface of the air shell.

[0013] Furthermore, the secondary heat exchanger is composed of a plurality of capillary heat exchange tubes arranged in parallel in the outer shell, and the plurality of capillary heat exchange tubes are connected to the air inlet, the flue gas return channel and the air circulation channel.

[0014] Furthermore, the combustion chamber is provided with a plurality of air inlet holes communicating with the air circulation channel.

[0015] Furthermore, the air inlet and the smoke outlet are respectively arranged above and below the air shell.

[0016] Furthermore, the air housing is provided with a plurality of vent holes for the air flowing into the air inlet to enter.

[0017] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0018] The high-efficiency self-preheating burner of the utility model recovers the waste heat of the flue gas through the primary heat exchanger during the initial combustion, and then the refluxed flue gas exchanges the waste heat of the flue gas with the air through the secondary heat exchanger in the outer shell, thereby raising the temperature of the air. The air then undergoes secondary heat exchange and temperature increase through the waste heat of the primary heat exchanger, thereby finally raising the temperature of the air in the combustion chamber and causing the temperature of the flame ejected after the combustion of the gas and air to be high, thus meeting the requirements of practical use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The technical solution of the utility model is further described below with reference to the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the internal structure of an embodiment of the present utility model;

[0021] Figure 2 for Figure 1 A partial schematic diagram of

[0022] Figure 3 It is a partial cross-sectional view of an embodiment of the present utility model;

[0023] Among them: air shell 1, outer shell 2, primary heat exchanger 3, secondary heat exchanger 4, gas shell 5, self-cooling electrode 6, combustion chamber 10, flame nozzle 11, air vent 12, flue gas return channel 20, air inlet 21, flue gas outlet 22, air circulation channel 30, fins 31, gas conduit 50, gas inlet 51, air inlet 100. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0025] The utility model provides a high-efficiency self-preheating burner to solve the problems of poor flue gas waste heat recovery capability and relatively complex structure of the preheating burner in the prior art.

[0026] For ease of understanding, the specific process in the embodiment of this application is described below. Figures 1 to 3 , a high-efficiency self-preheating burner in the embodiment of the present application includes an air shell 1, an outer shell 2, a primary heat exchanger 3, a secondary heat exchanger 4, a gas shell 5 and a self-cooling electrode 6; a combustion chamber 10 is provided inside the right end of the air shell 1, and the outlet of the combustion chamber 10 is connected to a flame nozzle 11 for spraying flames; the outer shell 2 is arranged on the outside of the left side of the air shell 1, and a smoke reflow channel 20 is left between the outer shell 2 and the air shell 1 for the smoke to enter the interior of the outer shell 2; and an air inlet 21 and a smoke outlet 22 are opened on the outer shell 2, and the air inlet 21 and the smoke outlet 22 are both connected to the outer shell 2.

[0027] The primary heat exchanger 3 is sleeved on the outer surface of the air shell 1, and an air circulation channel 30 for air circulation is formed between the primary heat exchanger 3 and the air shell 1. The air circulation channel 30 is communicated with the combustion chamber 10, so that the air entering from the outer shell 2 can enter the combustion chamber 10 through the air circulation channel 30 to meet the air required for secondary combustion.

[0028] The secondary heat exchanger 4 is arranged in the outer shell 2 and is connected to the flue gas return channel 20 and the air circulation channel 30; the gas shell 5 is installed at one end of the outer shell 2, and the gas shell 5 is connected to the combustion chamber 10 through a gas conduit 50 located in the air shell 1, so as to deliver the gas into the combustion chamber. A gas inlet 51 is provided on the gas shell 5; the self-cooling electrode 6 is provided outside the gas shell 5, and the ignition end of the self-cooling electrode 6 is provided in the combustion chamber 10. The gas and air in the combustion chamber 10 can be ignited by the self-cooling electrode 6 to react and generate a flame.

[0029] Furthermore, in this embodiment, the first-stage heat exchanger 3 is composed of a plurality of heat exchange fins 31 evenly attached to the right end of the air casing 1. An air circulation channel 30 for reserving gas to enter the combustion chamber 10 is formed between the plurality of heat exchange fins 31 and the air casing 1. Air can enter the air circulation channel 30 to achieve heat exchange with the heat exchange fins 31, thereby increasing the temperature of the air.

[0030] Among them, in order to allow the air that has been heated by heat exchange with the secondary heat exchanger 4 to enter the combustion chamber 10, a plurality of air inlet holes 100 that are connected to the air circulation channel 30 are provided in the combustion chamber 10. The air inlet holes 100 are also in communication with the interior of the air casing 1, so that the air in the air casing 1 can also flow into the combustion chamber through the air inlet holes 100.

[0031] Furthermore, the secondary heat exchanger 4 is composed of a plurality of capillary heat exchange tubes 40 arranged in parallel, and the plurality of capillary heat exchange tubes 40 are connected to the air inlet 21, the flue gas return channel 20 and the air circulation channel 30, so that the flue gas return channel 20 returns the flue gas with heat to the capillary heat exchange tube 40, and the air flowing in from the air inlet 21 and the flue gas with heat exchange through the capillary heat exchange tube, thereby increasing the temperature of the air. The heated air enters the air circulation channel 30 and flows into the combustion chamber 10.

[0032] Furthermore, in this embodiment, the air inlet 21 and the smoke outlet 22 are respectively located at the upper and lower ends of the outer shell 2. During the reaction, air enters from the lower end of the outer shell 2, and the smoke outlet 22 flows out from the upper end of the outer shell 2.

[0033] Furthermore, a plurality of air vents 12 for air entry are provided on the left end of the air housing 1, so that a portion of the air can directly enter the air housing 1 through the outer shell 2, and finally flow into the combustion chamber 10 through the air inlet 100 to mix and react with the fuel gas.

[0034] The actual process flow is as follows:

[0035] First, the outside air flows in from the air inlet 21, then enters the interior of the air shell 1 through the vent 12, and then enters the combustion chamber through the air inlet 100 on the combustion chamber 10. The gas enters from the gas inlet 51, and then flows into the combustion chamber 10 through the gas conduit 50. At this time, the self-cooling electrode 6 ignites, so that the air and gas are mixed and burned in the combustion chamber 10 and then emit flames. When the flames are emitted, high-temperature flue gas is generated. At the same time, the heat generated after combustion is transferred to the heat exchange fins 31 of the first-stage heat exchanger 3 through the air shell 1.

[0036] At this time, part of the high-temperature flue gas ejected will flow back from right to left, and the high-temperature flue gas will flow back to the multiple capillary heat exchange tubes 40 in the outer shell 2 through the flue gas return channel 20. At the same time, the air flowing in from the air inlet 21 also flows into the multiple capillary heat exchange tubes 40. At this time, the air and the high-temperature flue gas undergo the first heat exchange through the capillary heat exchange tubes 40, thereby increasing the temperature of the air. Then the high-temperature air flows to the combustion chamber 10 through the air circulation channel 30, and enters the combustion chamber through the air inlet 100 on the combustion chamber 10. In the process of the high-temperature air flowing in the combustion chamber 10, the multiple heating fins 31 then undergo a second heat exchange with the high-temperature air, further increasing the temperature of the air, so that the flame temperature ejected after the air and gas are mixed in the combustion chamber 10 is higher, meeting actual usage needs.

[0037] The high-efficiency self-preheating burner of the utility model recovers the waste heat of the flue gas through the primary heat exchanger during the initial combustion, and then the refluxed flue gas exchanges the waste heat of the flue gas with the air through the secondary heat exchanger in the outer shell, thereby raising the temperature of the air. The air then undergoes secondary heat exchange and temperature increase through the waste heat of the primary heat exchanger, thereby finally raising the temperature of the air in the combustion chamber and causing the temperature of the flame ejected after the combustion of the gas and air to be high, thus meeting the requirements of practical use.

[0038] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A high-efficiency self-preheating burner, characterized in that: include: An air casing, wherein a combustion chamber is provided inside one end of the air casing, and an outlet of the combustion chamber is connected to a flame ejection port for ejecting flames; The outer shell is sleeved in the other end of the air shell, and a smoke return channel is left between the outer shell and the air shell for smoke to enter the inner part of the outer shell; wherein the outer shell is provided with an air inlet and a smoke outlet; a primary heat exchanger, sleeved on the outer surface of the air housing, with an air circulation channel for air circulation formed between the primary heat exchanger and the air housing, the air circulation channel communicating with the combustion chamber; a secondary heat exchanger, disposed in the outer shell and in communication with the air inlet, the flue gas return channel, and the air circulation channel respectively; a gas shell, disposed at one end of the outer shell, the gas shell being in communication with the combustion chamber via a gas conduit for delivering gas into the combustion chamber, and a gas inlet being provided on the gas shell; A self-cooling electrode is arranged outside the gas shell, and an ignition end of the self-cooling electrode is arranged in the combustion chamber.

2. The high-efficiency self-preheating burner according to claim 1, characterized in that: The primary heat exchanger is composed of a plurality of heat exchange fins uniformly attached to the surface of the air shell.

3. The high-efficiency self-preheating burner according to claim 1, characterized in that: The secondary heat exchanger is composed of a plurality of capillary heat exchange tubes arranged in parallel in an outer shell, and the plurality of capillary heat exchange tubes are communicated with an air inlet, a flue gas return channel and an air circulation channel.

4. The high-efficiency self-preheating burner according to claim 1, characterized in that: The combustion chamber is provided with a plurality of air inlet holes communicating with the air circulation channel.

5. The high-efficiency self-preheating burner according to claim 1, characterized in that: The air inlet and the smoke outlet are respectively arranged above and below the air shell.

6. The high-efficiency self-preheating burner according to claim 1, characterized in that: The air shell is provided with a plurality of vent holes for the air flowing into the air inlet to enter.

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