Grate with single air duct

Abstract

The utility model discloses a grate with a single air duct. The grate comprises a grate cap, a plurality of grate bodies, a base and ash discharge ribs, the multiple grate bodies are sequentially arranged from top to bottom, and the sizes of the grate bodies are gradually increased. The middles of the adjacent grate bodies are communicated to form inner cavities; the uppermost grate body is close to the grate cap, and the lowermost grate body is connected with the base; wherein a downward extending part is arranged on the peripheral side of the lower end of the grate cap; a first extension part and a second extension part are correspondingly arranged at the upper end and the lower end of the peripheral side of each grate body; the first extension part of the uppermost grate body is located on the inner side of the lower extension part, the first extension part of the lower grate body is located on the inner side of the second extension part of the upper grate body, and single air channels used for exhausting air are formed between the corresponding extension parts in parallel. According to the utility model, accumulation and blockage of ash in a single air duct can be reduced, gas can be quickly diffused to fill the inner cavity of the grate, gas distribution is facilitated, and the grate is suitable for pressurized air gasification and oxygen gasification gas stoves.

Description

Technical Field

[0001] This utility model relates to the field of gas furnace equipment, specifically to a single-duct grate. Background Technology

[0002] The grate is a key component in combustion equipment. It is usually installed at the bottom of the furnace to support fuels such as coal and wood to promote air circulation and optimize combustion efficiency.

[0003] In industries such as air gas and oxygen gas, the grate of a gas generator is often composed of multiple grate bodies 20 forming a cone-like structure. The multiple grate bodies 20 are progressively larger, with the lowest grate body 20 located on the base 40, and exhaust ducts are formed at the edges of adjacent grate bodies 20.

[0004] The exhaust duct with internal and external air ducts has the problem of ash and slag accumulation. That is, the internal and external air ducts are different in size, resulting in high ventilation resistance and low gas production, making it difficult to blow out ash and slag. In severe cases, it will cause blockage and even require production shutdown for repair. In addition, the base 40 of the main structure is installed on a flat plate, which has limited air distribution and is not conducive to gas diffusion to fill the grate. It is suitable for atmospheric pressure, but cannot meet the needs of pressurized air gasification and oxygen gasification gasifiers. Summary of the Invention

[0005] The purpose of this utility model is to provide a single-duct grate that can reduce the accumulation and blockage of ash and slag in the single duct, and the gas can quickly diffuse and fill the inner cavity of the grate, which is beneficial to gas distribution. It is suitable for pressurized air gasification and oxygen gasification gasifiers.

[0006] To achieve the above objectives, this single-duct grate includes:

[0007] Stove grate cap;

[0008] Multiple grate bodies are arranged sequentially from top to bottom with gradually increasing size; each grate body has a first connecting hole in the middle, and adjacent grate bodies are connected to form an inner cavity; the uppermost grate body is close to the grate cap, and the lowermost grate body is connected to the base;

[0009] The base has a second communicating hole that communicates with the inner cavity;

[0010] Ash removal ribs are fixed between adjacent grate bodies and between the grate cap and the uppermost grate body;

[0011] The grate cap has a lower extension on its lower periphery;

[0012] Each grate body has a first extension and a second extension at its upper and lower periphery respectively; the first extension of the uppermost grate body is located inside the lower extension, and the first extension of the lower grate body is located inside the second extension of the upper grate body, and the corresponding extensions form a single air duct for exhaust in parallel.

[0013] In some examples of this utility model, the base is a shell structure that is wider at the top and narrower at the bottom.

[0014] In some examples of this utility model, the base is an outwardly curved flared structure, an inverted cone structure, or an inverted umbrella-shaped structure.

[0015] In some examples of this utility model, the angle β between the first extension / second extension and the horizontal plane is greater than the angle α between the grate body and the horizontal plane.

[0016] In some examples of this utility model, the angle α between the grate body and the horizontal plane increases sequentially from top to bottom.

[0017] In some examples of this utility model, the grate cap is a hemispherical shell structure, and three ash discharge ribs are provided on the spherical surface;

[0018] The number of grate bodies is seven, and six ash removal ribs are evenly distributed among them.

[0019] Compared with existing technologies, this single-duct grate has a unique feature: the first extension in the lower grate body is located inside the second extension in the upper grate body, and they are parallel to each other to form a single air duct for exhaust. When the gas passes through the single air duct, the ventilation resistance is small, and the stronger airflow makes it easier to blow out the ash and slag, avoiding the accumulation and blockage of ash and slag in the single air duct. In addition, the base has a shell structure that is wider at the top and narrower at the bottom. After the gas enters from the second connecting hole at the narrow end, it can quickly diffuse and fill the inner cavity of the grate, which is beneficial to gas distribution and is more suitable for pressurized air gasification and oxygen gasification gasifiers.

[0020] Since the angle between the first extension / second extension and the horizontal plane is greater than the angle between the grate body and the horizontal plane, when the gas is discharged from the inner cavity along the single air duct formed by the adjacent first extension and second extension, it can ensure a large air force to blow out the ash and slag, and the bending angle can reduce the reaction of the ash and slag pushing into the inner cavity. Attached Figure Description

[0021] Figure 1 This is the overall front view of this utility model;

[0022] Figure 2 yes Figure 1 A magnified view of a portion of the image;

[0023] Figure 3This is a schematic diagram of the angle α between the grate body and the horizontal plane, and the angle β between the first extension / second extension and the horizontal plane of this utility model;

[0024] In the diagram: 10. Furnace grate cap; 11. Lower extension;

[0025] 20. Grate body; 201. First connecting hole; 21. First extension; 22. Second extension;

[0026] 30. Laying out mortar reinforcement bars;

[0027] 40. Base; 401. Second connecting hole;

[0028] 50. Single air duct;

[0029] 60, inner cavity 60;

[0030] α, the angle between the grate body and the horizontal plane; β, the angle between the first extension / second extension and the horizontal plane. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0032] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, “an” or “a” and similar terms do not necessarily indicate a quantity limitation. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0033] like Figure 1 , Figure 2As shown, this single-duct grate includes:

[0034] The grate cap 10 has a lower extension 11 on its lower periphery;

[0035] Multiple grate bodies 20 are arranged sequentially from top to bottom and their sizes gradually increase; each grate body 20 has a first connecting hole 201 in the middle and the adjacent ones are connected to form an inner cavity 60; the uppermost grate body 20 is close to the grate cap 10 and the lowermost grate body 20 is connected to the base 40.

[0036] Each grate body 20 has a first extension 21 and a second extension 22 on its upper and lower periphery, respectively; the first extension 21 of the uppermost grate body 20 is located inside the lower extension 11 of the grate cap 10, and the first extension 21 of the lower grate body 20 is located inside the second extension 22 of the upper grate body 20, and a single air duct 50 for exhaust is formed in parallel between the corresponding extensions.

[0037] The base 40 has a second communicating hole 401 that communicates with the inner cavity 60;

[0038] Ash removal ribs 30 are fixed between adjacent grate bodies 20 and between the grate cap 10 and the uppermost grate body 20;

[0039] Specifically, the single-duct grate can be made of cast iron / cast steel or heat-resistant alloy material, which can have a certain strength and high temperature resistance; the grate cap 10 is located above the grate body 20, and multiple grate bodies 20 are stacked at intervals with the same center, and the size gradually increases when stacked. Multiple grate bodies 20 are connected through their respective first connecting holes 201 to form an inner cavity 60, so that air enters from the second connecting hole 401 of the base 40;

[0040] The upper end of the grate body 20 has a first extension 21 and the lower end has a second extension 22. When multiple grate bodies 20 are stacked, the first extension 21 in the lower grate body 20 can be located inside the second extension 22 in the upper grate body 20, thus forming a single air duct 50, and the width of the single air duct 50 can be kept consistent.

[0041] The base 40 must have sufficient strength and rigidity to withstand high temperatures and heavy loads, and be able to reduce heat transfer downwards to protect the equipment and structure below. The base 40 can be installed at the end of the column inside the furnace.

[0042] Ash discharge ribs 30 are fixed between adjacent grate bodies 20 and between the grate cap 10 and the uppermost grate body 20. Their number is determined according to the grate design requirements. They can be inclined or spiral structures, which can guide the ash and slag after combustion to pass smoothly through the gaps in the grate bodies 20 and fall into the ash hopper below to prevent ash and slag accumulation. It is noted that the ash discharge ribs 30 can be fixedly connected to two adjacent grate bodies 20 by casting or by fasteners.

[0043] When this single-duct grate is in use, gas enters the inner cavity 60 through the second connecting hole 401 of the base 40, passes through the single-duct 50, and causes the ash and slag after combustion to fall into the ash hopper below. Since the first extension 21 in the lower grate body 20 is located inside the second extension 22 in the upper grate body 20, and they are parallel to each other to form a single-duct 50 for exhaust, the ventilation resistance is small when the gas passes through the single-duct 50, and the larger air force can more easily blow the ash and slag out, avoiding the accumulation and blockage of ash and slag on the single-duct 50.

[0044] like Figure 1 As shown, in some examples of this utility model, the base 40 is a shell structure that is wider at the top and narrower at the bottom;

[0045] Specifically, the traditional base 40 has a columnar structure and is directly mounted on the flat plate. This structure has limited air distribution and is suitable for atmospheric pressure gas furnaces.

[0046] In this example, the base 40 adopts a structure that is wider at the top and narrower at the bottom. It is installed at the column end inside the furnace. After the gas enters from the second connecting hole 401 at the narrow end, it can quickly diffuse and fill the inner cavity 60 of the grate, which is beneficial to gas distribution and is suitable for pressurized air gasification and oxygen gasification gasifiers.

[0047] Furthermore, the base 40 is an outward-curving trumpet-shaped structure, an inverted cone structure, or an inverted umbrella-shaped structure;

[0048] The base 40 needs to maintain rigidity at high temperatures. Its flared or inverted cone or inverted umbrella-shaped structure is adapted to match different production processes to reduce processing costs. This ensures that the base 40 meets the structural stability and load-bearing capacity requirements under different environments, and also allows for uniform air distribution after the gas enters from the base 40.

[0049] like Figure 3 As shown, in some examples of this utility model, the angle β between the first extension 21 / second extension 22 and the horizontal plane is greater than the angle α between the grate body 20 and the horizontal plane;

[0050] Specifically, the grate body 20 can be a shell structure with a uniform thickness, and its angle with the horizontal plane is α;

[0051] The angle β between the first extension 21 / second extension 22 and the horizontal plane must be greater than α, meaning that there is a bend in the single air duct 50 connecting to the outer side of the grate body 20. When gas is discharged from the inner cavity 60 along the single air duct 50 formed by the adjacent first extension 21 and second extension 22, it can ensure a large air force to blow out the ash and slag, and reduce the reaction force of the ash and slag pushing into the inner cavity 60. That is, during the ash and slag discharge process, the ash discharge rib 30 pushes the ash and slag towards the furnace wall. If the ash and slag cannot enter the ash hopper in time, there is a phenomenon of reverse entry into the inner cavity 60. Since there is a bend in the single air duct 50 and the outer side of the grate body 20, the ash and slag pass through the first extension 21 /

[0052] The second extension 22 blocks the flow into the single air duct 50 instead of entering in a straight line, thus reducing the reaction force of ash and slag pushing it into the inner cavity 60.

[0053] Furthermore, the angle α between the grate body 20 and the horizontal plane increases sequentially from top to bottom;

[0054] Specifically, the angle α between the grate body 20 and the horizontal plane increases from top to bottom. At this time, the inward inlet angle of the single air duct 50 increases relatively, which more effectively avoids blockage. Preferably, the tilt angle of the grate body 20 increases by 1 degree from top to bottom.

[0055] In addition, the width of the single air duct 50 can also decrease from top to bottom. The relatively narrow single air duct 50 can ensure uniform airflow distribution and maintain a high-temperature environment, avoiding excessive or insufficient combustion. The relatively wide single air duct 50 can facilitate the falling of ash and slag, avoid blockage, reduce airflow resistance, increase ventilation volume, and improve combustion efficiency.

[0056] In some examples of this utility model, the grate cap 10 is a hemispherical shell structure, and three ash discharge ribs 30 are provided on the spherical surface;

[0057] The number of grate bodies 20 is seven, and six ash discharge ribs 30 are evenly distributed among them;

[0058] Specifically, taking the Lurgi furnace with a furnace diameter of 3800mm as an example, it is a fixed-bed coal gasifier. According to the design requirements, its furnace height can be 15-25m. It uses a mixture of oxygen (or air) and steam as the gasifying agent, and the operating pressure can reach 2.5-3MPa. The temperature of the gasification zone can reach 1000-1200℃.

[0059] At this point, the entire single-duct grate needs to be made of high-temperature resistant material. There are seven grate bodies 20, which, together with the grate cap 10 and the base 40, form a nine-layer structure. The grate cap 10 is provided with three ash discharge ribs 30, and there are six ash discharge ribs 30 between the multiple grate bodies 20. From a top view, the grate cap 10 of the first layer and the grate bodies 20 of the second to eighth layers can be circular structures. The base 40 is an inverted conical structure, which allows the gas entering from the narrow opening at the bottom to diffuse better into the inner cavity 60, which is beneficial to gas distribution and is suitable for pressurized air gasification and oxygen gasification gasifiers.

[0060] The first extension 21 in the adjacent lower grate body 20 matches the second extension 22 in the upper grate body 20, that is, the common internal and external air ducts between layers are adjusted to a single air duct 50, so that the ash and slag can be blown away by the greater blowing force and the accumulation of ash and slag can be avoided.

[0061] The exemplary embodiments of the single-duct grate proposed by this utility model have been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the concept of this utility model, and various combinations can be made to the various technical features and structures proposed by this utility model without exceeding the protection scope of this utility model. The protection scope of this utility model is determined by the appended claims.

Claims

1. A single air duct stove grate, comprising: a stove grate cap (10) ; a plurality of stove grate bodies (20) arranged in order from top to bottom and gradually increasing in size; each stove grate body (20) has a first communication hole (201) in the middle part, and the adjacent communication holes form an inner cavity (60) ; the uppermost stove grate body (20) is close to the stove grate cap (10), and the lowermost stove grate body (20) is connected with the base (40) ; characterized in that it further comprises: a base (40) having a second communication hole (401) in communication with the inner cavity (60) ; an ash removal rib (30) fixed between adjacent stove grate bodies (20) and between the stove grate cap (10) and the uppermost stove grate body (20) ; wherein the lower end of the stove grate cap (10) has a lower extension (11) on the side; each stove grate body (20) has a first extension (21) and a second extension (22) on the side at the upper and lower ends respectively; the first extension (21) of the uppermost stove grate body (20) is located inside the lower extension (11), and the first extension (21) of the lowermost stove grate body (20) is located inside the second extension (22) of the upper stove grate body (20), and the corresponding extensions form a single air duct (50) for air exhaust in parallel.

2. The single duct grate of claim 1, wherein, The base (40) is a shell structure with a wide top and a narrow bottom.

3. The single duct grate of claim 2, wherein, The base (40) is a horn structure with an outward arc shape, or a reverse cone structure or a reverse umbrella structure.

4. The single duct grate according to any one of claims 1 to 3, characterized in that The angle β between the first extension (21) / second extension (22) and the horizontal plane is greater than the angle α between the stove grate body (20) and the horizontal plane.

5. The single duct grate of claim 4, wherein, The included angle α between the stove grate body (20) and the horizontal plane increases from top to bottom.

6. The single duct grate of claim 1, wherein, The stove grate cap (10) is a hemispherical shell structure, and three ash removal ribs (30) are arranged on the spherical surface; The number of stove grate bodies (20) is seven, and six ash removal ribs (30) are evenly distributed between them.

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