Dual fuel hot air stove

Abstract

The utility model relates to the technical field of hot blast furnaces, and in particular to a dual-fuel hot blast furnace, so as to solve the problem that the hot blast furnace in the prior art has no structure for integrating dual-fuel combustion; the utility model comprises a combustion chamber and a burnout chamber, the combustion chamber is arranged vertically, the burnout chamber is arranged horizontally, and is connected to the bottom side wall of the combustion chamber, the combustion chamber and the burnout chamber are in a vertical structure, a first burner extending downward is arranged at the top of the combustion chamber, and a second burner extending toward the burnout chamber is arranged on the bottom side wall of the combustion chamber; by designing a combustion chamber arranged vertically and a burnout chamber arranged horizontally, a first burner is arranged in the combustion chamber to spray flame downward, and a second burner is arranged to spray flame horizontally, the first burner is initially burned, and then the gas mixture moves downward and is mixed at the second burner for a second combustion, and two-stage combustion can also be performed in the combustion furnace, thereby dispersing the flame temperature, so as to avoid excessive temperature caused by flame concentration and generate a large amount of NOx nitrogen oxides.

Description

Technical Field

[0001] The utility model relates to the technical field of hot blast stoves, in particular to a dual-fuel hot blast stove. Background Art

[0002] Hot air furnace is a combustion furnace that produces high-temperature flue gas. Dual fuel is two fuels with different combustion characteristics, especially for combustible gases, each gas can only use a specific burner. In order to save energy costs, enterprises often give priority to using self-produced biomass gas, coal gas, biogas, VOCs, etc., but the production of these combustible gases is unstable. Enterprises will want to use natural gas as a backup fuel.

[0003] Hot blast furnaces are built with heavy refractory bricks. Under high temperatures, they often collapse due to unreasonable structures. Installing two burners in a hot blast furnace is more likely to cause unreasonable structures. Based on this background, this scheme designs a dual-fuel hot blast furnace with a reasonable structure. Two burners ignite two different fuels, which are fully and safely burned in the same hot blast furnace. Utility Model Content

[0004] Based on the above description, the utility model provides a dual-fuel hot blast stove to solve the problem that the hot blast stove in the prior art has no structure integrating dual-fuel combustion.

[0005] The technical solution of the utility model to solve the above technical problems is as follows:

[0006] A dual-fuel hot air stove, comprising:

[0007] The combustion chamber is arranged vertically and is provided with a first air inlet portion;

[0008] A burnout chamber is arranged transversely and connected to the bottom side wall of the combustion chamber;

[0009] An air outlet connected to the rear end of the burnout chamber;

[0010] Wherein, a first burner extending downward is arranged on the top of the combustion chamber, and a second burner extending toward the burnout chamber is arranged on the bottom side wall of the combustion chamber.

[0011] On the basis of the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, a secondary air distribution portion is provided between the combustion chamber and the burnout chamber and connected to the two, and a second air inlet portion is provided on the secondary air distribution portion.

[0013] Furthermore, a cylinder is arranged in an outer ring shape of the first burner, the first air inlet portion includes a first air inlet and a first wind hood, the first wind hood is sleeved on the outer ring of the cylinder, the first air inlet is connected to the first wind hood, and a first guide plate is arranged in an annular shape at the bottom of the cylinder, and the first guide plate is a conical structure with a closing end from top to bottom.

[0014] Furthermore, the secondary air distribution part includes a first connecting member and a second connecting member that maintain a distance, the first connecting member is connected to the bottom side wall of the combustion chamber, the second connecting member is connected to the side wall of the burnout chamber, the second air inlet part includes a second air inlet and a second wind hood, the second wind hood is sleeved on the outside of the first connecting member and the second connecting member and connected to the two, and the second air inlet is connected to the second wind hood.

[0015] Furthermore, a second guide plate is annularly arranged at the end of the first connecting member, and the second guide plate forms a conical structure that closes continuously along the wind direction.

[0016] Furthermore, the first burner extends to the bottom of the cylinder, and the cylinder body of the first burner is a cone whose diameter decreases continuously from top to bottom.

[0017] Furthermore, the bottom of the combustion chamber is paved with refractory material, and the bottom of the secondary air distribution part is higher than the top surface of the refractory material.

[0018] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0019] By designing a vertically arranged combustion chamber and a horizontally arranged burnout chamber, a first burner is arranged in the combustion chamber to spray flame downward, and a second burner is arranged to spray flame horizontally. The first burner performs preliminary combustion, and then the gas mixture moves downward and is mixed at the second burner for a second combustion. The positional relationship design of the first burner and the second burner can achieve two-stage combustion in the combustion furnace, thereby dispersing the flame temperature to avoid excessive temperature caused by flame concentration and the generation of a large amount of NOx nitrogen oxides. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a combustion chamber of a dual-fuel hot blast stove provided in an embodiment of the utility model;

[0021] Figure 2 A schematic diagram of the structure of a dual-fuel hot air stove provided in an embodiment of the utility model;

[0022] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0023] 1. Combustion chamber; 2. Burnout chamber; 3. Air outlet; 4. Secondary air distribution unit; 5. First burner; 6. Second burner; 7. Cylinder; 8. First air inlet; 9. First wind hood; 10. First guide plate; 11. First connecting piece; 12. Second connecting piece; 13. Second air inlet; 14. Second wind hood; 15. Second guide plate; 16. Refractory material. DETAILED DESCRIPTION

[0024] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0026] It will be appreciated that spatial relationship terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be appreciated that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0027] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. The "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0028] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0029] like Figure 1 , Figure 2 A dual-fuel hot blast stove is shown, comprising a combustion chamber 1 and a burnout chamber 2. The combustion chamber 1 is arranged vertically, and a first air inlet is arranged above it, and the first air inlet blows air into the combustion chamber 1 to assist combustion. The burnout chamber 2 is arranged horizontally, and is connected to the bottom side wall of the combustion chamber 1. The tail end of the burnout chamber 2 is connected to an air outlet 3. The combustion chamber 1 and the burnout chamber 2 are in a vertical structure, and a first burner 5 extending downward is arranged on the top of the combustion chamber 1, and a second burner 6 extending toward the burnout chamber 2 is arranged on the bottom side wall of the combustion chamber 1.

[0030] The first burner 5 sprays flame downward, and the second burner 6 sprays flame horizontally. The first burner 5 is initially burned, and then the gas mixture moves downward and is mixed at the second burner 6 for a second combustion. The positional relationship design of the first burner 5 and the second burner 6 can enable two-stage combustion in the combustion furnace, thereby dispersing the flame temperature to avoid excessive temperature caused by flame concentration and the generation of a large amount of NOx nitrogen oxides.

[0031] In one embodiment, a secondary air distribution portion 4 is provided between the combustion chamber 1 and the burnout chamber 2 to connect the two. A second air inlet portion is provided on the secondary air distribution portion 4. Air is further added to the secondary air distribution portion 4 to strengthen the mixing of air and fuel gas, effectively reduce the thickness of the flame surface, shorten the residence time of the flue gas in the high temperature area, increase the length of the combustion interval, increase the combustion time, and reduce the generation of NOx. The air added by the second air inlet portion can be cooling air, which is used to cool the burnout chamber 2, so that the flame is kept within the set temperature range to inhibit the generation of NOx.

[0032] The secondary air distribution part 4 includes a first connecting member 11 and a second connecting member 12 which are kept at a distance, the first connecting member 11 is connected to the bottom side wall of the combustion chamber 1, the second connecting member 12 is connected to the side wall of the burnout chamber 2, the second air inlet part includes a second air inlet 13 and a second wind cover 14, the second wind cover 14 is sleeved on the outside of the first connecting member 11 and the second connecting member 12 and connected to the two, and the second air inlet 13 is connected to the second wind cover 14. A second guide plate 15 is provided in an annular shape at the end of the first connecting member 11, and the second guide plate 15 forms a conical structure that is continuously closed along the wind direction.

[0033] Specifically, a cylinder 7 is arranged in an outer ring shape on the outside of the first burner 5, and a first air inlet portion includes a first air inlet 8 and a first wind cover 9. The first wind cover 9 is sleeved on the outer ring of the cylinder 7, and the first air inlet 8 is connected to the first wind cover 9. A first guide plate 10 is arranged in an annular shape on the bottom of the cylinder 7. The first guide plate 10 is a tapered structure with a closing mouth from top to bottom. The first air inlet portion allows external air to enter the bottom of the first burner 5 from the first guide plate 10 evenly in a circumference and be fully mixed with the fuel gas.

[0034] The first burner 5 extends to the bottom of the cylinder 7, and the cylinder of the first burner 5 is a cone whose diameter decreases from top to bottom. The cylinder has a slope. If the fuel gas of the first burner 5 uses a gas with more impurities, the impurities in the cylinder of the first burner 5, such as condensed water and high molecular organic matter, can flow into the burner by themselves. At the same time, the combustion chamber 1 is an insulated cavity to ensure the stable combustion of inferior gas.

[0035] Preferably, a refractory material 16 is laid on the bottom of the combustion chamber 1 , and the bottom of the secondary air distribution portion 4 is higher than the top surface of the refractory material 16 .

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A dual fuel hot air stove, characterized in that: include: The combustion chamber is arranged vertically and is provided with a first air inlet portion; A burnout chamber is arranged transversely and connected to the bottom side wall of the combustion chamber; An air outlet connected to the rear end of the burnout chamber; Wherein, a first burner extending downward is arranged on the top of the combustion chamber, and a second burner extending toward the burnout chamber is arranged on the bottom side wall of the combustion chamber.

2. A dual fuel hot blast stove according to claim 1, characterized in that: A secondary air distribution portion is arranged between the combustion chamber and the burnout chamber and connected to the combustion chamber, and a second air inlet portion is arranged on the secondary air distribution portion.

3. A dual fuel hot blast stove according to claim 1, characterized in that: A cylinder is arranged in an outer ring shape of the first burner, and the first air inlet portion includes a first air inlet and a first wind cover. The first wind cover is sleeved on the outer ring of the cylinder, and the first air inlet is connected to the first wind cover. A first guide plate is arranged in an annular shape at the bottom of the cylinder, and the first guide plate is a conical structure with a closing end from top to bottom.

4. A dual fuel hot blast stove according to claim 2, characterized in that: The secondary air distribution part includes a first connecting member and a second connecting member that maintain a distance, the first connecting member is connected to the bottom side wall of the combustion chamber, the second connecting member is connected to the side wall of the burnout chamber, the second air inlet part includes a second air inlet and a second wind cover, the second wind cover is sleeved on the outside of the first connecting member and the second connecting member and connected to the two, and the second air inlet is connected to the second wind cover.

5. A dual fuel hot blast stove according to claim 4, characterized in that: A second guide plate is annularly arranged at the end of the first connecting member, and the second guide plate forms a conical structure that closes continuously along the wind direction.

6. A dual fuel hot blast stove according to claim 3, characterized in that: The first burner extends to the bottom of the cylinder, and the cylinder body of the first burner is a cone whose diameter decreases continuously from top to bottom.

7. A dual fuel hot blast stove according to claim 2, characterized in that: The bottom of the combustion chamber is paved with refractory material, and the bottom of the secondary air distribution part is higher than the top surface of the refractory material.

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