Cloth bag dust hopper with heat preservation function

Abstract

The utility model discloses a cloth bag dust hopper with a heat preservation function. The cloth bag dust hopper comprises a wear-resistant and corrosion-resistant pouring layer, a dust hopper body, heat preservation cotton and a protection plate, the wear-resistant anti-corrosion pouring layer is arranged on the inner wall of the ash bucket body, and the heat preservation cotton and the protection plate are sequentially arranged on the outer wall of the ash bucket body from inside to outside. The bag-type dust hopper has the characteristics of compact structure, high heating uniformity, good thermal insulation performance and the like, and the temperature of the part, in contact with flue gas, of the bag-type dust hopper is not lower than the dew point of the flue gas by performing proper thermal insulation on the inner side and the outer side of the dust hopper, so that the flue gas is prevented from dewing, dust is prevented from being adhered, and the interior of the dust hopper is prevented from being blocked; and the service life of the ash bucket is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of baghouse dust collection technology, specifically to a baghouse ash hopper with heat preservation function. Background Technology

[0002] In flue gas treatment systems, baghouse dust collectors effectively capture dust and particulate matter, achieving dust removal efficiencies of over 99%, and have a wide range of applications. Baghouse dust collector systems typically consist of multiple compartments. Above each compartment is usually a pulse-jet or other soot-blowing system to remove dust and reaction products from the filter cloth. Below each compartment is an ash hopper to collect the falling dust and reaction products. Each ash hopper is equipped with a manual gate valve and a rotary valve, and fly ash is transported to the ash storage silo via a fly ash conveying system. When the ash hopper temperature is too low, moisture in the flue gas condenses, causing fly ash to adhere and solidify, potentially leading to blockage at the ash outlet. Especially during boiler start-up and shutdown, low-temperature corrosion also occurs, corroding the inner wall of the ash hopper. Severe corrosion can cause perforation, leading to air leakage and further reducing the internal temperature of the ash hopper. To avoid these problems, existing technologies generally employ heating methods, such as electric heating or steam heating, to raise the temperature of the ash hopper and prevent condensation-induced blockage.

[0003] While heat tracing can appropriately increase the temperature of the ash hopper's inner wall, it's difficult to guarantee that every part of the ash hopper's inner wall will be above the flue gas dew point temperature. Furthermore, under the combined effects of prolonged dust erosion and low-temperature corrosion, the metal ash hopper's inner wall is highly susceptible to perforation, causing air leakage and further lowering the temperature inside the ash hopper, creating a vicious cycle. In addition, heat tracing requires the consumption of other high-quality energy sources, such as electricity and steam, and also necessitates regular maintenance of the heat tracing pipelines. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a bag ash hopper with heat preservation function that has a compact structure, good corrosion resistance and high heat uniformity.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A heat-insulating bag ash hopper includes: a wear-resistant and corrosion-resistant castable layer, an ash hopper body, heat insulation cotton, and a protective plate; the wear-resistant and corrosion-resistant castable layer is disposed on the inner wall of the ash hopper body, and the heat insulation cotton and the protective plate are disposed sequentially from the inside to the outside of the ash hopper body.

[0007] As a further improvement of this utility model, the surface of the wear-resistant and corrosion-resistant casting layer is coated with a hydrophobic coating.

[0008] As a further improvement of this utility model, the thickness of the wear-resistant and corrosion-resistant casting layer decreases sequentially from the top of the ash hopper body to the bottom of the ash hopper body.

[0009] As a further improvement of this utility model, the ash hopper body is made of metal material.

[0010] As a further improvement of this utility model, multiple angle irons are provided on the inner wall of the ash hopper body, and the angle irons are used to fix the wear-resistant and corrosion-resistant casting layer in the ash hopper body.

[0011] As a further improvement of this utility model, the inner wall of the ash hopper body is provided with staggered horizontal and vertical plates, and the wear-resistant and corrosion-resistant casting layer is cast in the squares formed by the horizontal and vertical plates.

[0012] Compared with the prior art, the advantages of this utility model are:

[0013] This utility model relates to a heat-insulating bag ash hopper. By placing a wear-resistant and corrosion-resistant cast-in-place layer on the inner wall of the ash hopper body, and then sequentially placing insulation cotton and protective plates on the outer wall of the ash hopper body from the inside out, appropriate heat insulation is provided on both the inner and outer sides of the ash hopper body. This ensures that the temperature of the part of the bag ash hopper in contact with flue gas does not fall below the flue gas dew point, thereby achieving the goals of preventing flue gas condensation, preventing dust adhesion, and preventing ash blockage inside the ash hopper. At the same time, it also improves the corrosion resistance of the bag ash hopper and extends its service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram illustrating the structural principle of the bag ash hopper in a specific embodiment of this utility model;

[0015] Figure 2 This is a schematic diagram of the cross-sectional structure of the bag ash hopper in a specific embodiment of this utility model;

[0016] Figure 3 This is a schematic diagram of the structural principle of the ash hopper body in a specific embodiment of this utility model;

[0017] Legend: 1. Wear-resistant and corrosion-resistant casting layer; 2. Ash hopper body; 3. Insulation cotton; 4. Protective plate; 5. Hydrophobic coating; 6. Angle iron; 7. Horizontal plate; 8. Vertical plate. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0019] In the description of this utility model, it should be understood that the terms "side", "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0021] Example

[0022] like Figure 1 and Figure 2 As shown, the present invention relates to a heat-insulating baghouse ash hopper, comprising: a wear-resistant and corrosion-resistant castable layer 1, an ash hopper body 2, insulation cotton 3, and a protective plate 4. The wear-resistant and corrosion-resistant castable layer 1 is disposed on the inner wall of the ash hopper body 2, and the insulation cotton 3 and the protective plate 4 are disposed sequentially from the inside to the outside of the ash hopper body 2. By disposing of the wear-resistant and corrosion-resistant castable layer 1 on the inner wall of the ash hopper body 2, and disposing of the insulation cotton 3 and the protective plate 4 sequentially from the inside to the outside of the ash hopper body 2, appropriate heat insulation is provided on both the inner and outer sides of the ash hopper body 2. This ensures that the temperature of the part of the baghouse ash hopper in contact with flue gas does not fall below the flue gas dew point, thereby preventing flue gas condensation, dust adhesion, and ash blockage inside the ash hopper. It also improves the corrosion resistance of the baghouse ash hopper and extends its service life.

[0023] like Figure 2 As shown, the surface of the wear-resistant and corrosion-resistant casting layer 1 is coated with a hydrophobic coating 5. By coating the inner surface of the wear-resistant and corrosion-resistant casting layer 1 with a hydrophobic coating 5, the surface energy of the wear-resistant and corrosion-resistant casting layer 1 is reduced, making it difficult for condensed water droplets to adhere and further preventing dust adhesion.

[0024] like Figure 2As shown, the thickness of the wear-resistant and corrosion-resistant castable layer 1 decreases progressively from the top to the bottom of the ash hopper body 2. The inner side of the ash hopper body 2 is insulated using castable refractory, which provides both insulation and wear and corrosion resistance, extending the service life of the ash hopper. Due to erosion, the upper castable layer experiences more wear than the lower layer; therefore, the thickness of the upper castable layer is appropriately increased, while the thickness of the lower castable layer is appropriately reduced.

[0025] In this embodiment, the ash hopper body 2 is made of metal material, which has good thermal conductivity.

[0026] Due to process requirements, the flue gas inlet temperature of a bag filter dust collector is generally around 145℃~155℃, and the outlet temperature is also generally around 145℃. The acid dew point temperature of flue gas is generally around 116℃~138℃. As long as the insulation effect of the ash hopper can be guaranteed, it can be ensured that the flue gas will not condense during its flow through the bag filter dust collector.

[0027] In this embodiment, regarding the ash blockage issue, the inner side of the ash hopper body 2 is a wear-resistant and corrosion-resistant castable layer 1, whose thermal conductivity is generally around 0.024W / mk to 0.038W / mk, providing good insulation. This ensures that the temperature of the surface in contact with the flue gas does not fall below 140℃ while maintaining the flue gas inlet temperature. Since the acid dew point temperature of the flue gas is generally 116℃ to 138℃, condensation and adhesion will not occur when the flue gas comes into contact with the castable, thus preventing ash blockage. Simultaneously, the surface of the wear-resistant and corrosion-resistant castable layer 1 is coated with a hydrophobic coating 5, further reducing the adhesion of water condensation and preventing dust adhesion.

[0028] Regarding erosion and corrosion, the inner wall of the ash hopper body 2 is coated with a wear-resistant and corrosion-resistant material. This effectively reduces the direct erosion of the ash hopper metal plate by dust and reaction products. Although dust and reaction products will erode the castable, their wear-resistant properties minimize the impact. Furthermore, flue gas, dust, and reaction products cannot directly contact the ash hopper metal plate, thus preventing the ash hopper from being affected by low-temperature corrosion and avoiding corrosion perforation.

[0029] like Figure 2 As shown, multiple angle irons 6 are provided on the inner wall of the ash hopper body 2. In order to apply the refractory to the flat metal plate, angle irons 6 of appropriate length are welded on the metal plate to fix the wear-resistant and corrosion-resistant refractory layer 1 inside the ash hopper body 2 and prevent the refractory from falling off later.

[0030] like Figure 3As shown, the inner wall of the ash hopper body 2 is provided with staggered horizontal plates 7 and vertical plates 8. The wear-resistant and corrosion-resistant castable layer 1 is cast within the squares formed by the horizontal plates 7 and vertical plates 8. The wear-resistant and corrosion-resistant castable layer 1 is cast in sections, which facilitates the removal and recasting of severely worn castable material in individual squares in the later stage, avoiding the need for complete removal and recasting of the wear-resistant and corrosion-resistant castable layer 1, and greatly reducing the amount of maintenance work in the later stage.

[0031] In this embodiment, a wear-resistant and corrosion-resistant casting layer 1 is laid on the inner wall of the ash hopper body 2, and thermal insulation cotton 3 is tightly laid on the outer side of the ash hopper body 2. The outer side of the thermal insulation cotton 3 is covered with a protective plate 4, which achieves the effect of fixing the thermal insulation cotton 3 and keeping it warm. Without the use of heat tracing, the flue gas temperature inside the bag ash hopper is maintained, achieving the purpose of preventing condensation of flue gas and preventing dust and reaction products from sticking together, thus realizing that the ash hopper is not clogged.

[0032] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A cloth bag ash hopper with heat preservation function, characterized in that, include: Wear-resistant and corrosion-resistant castable layer (1), ash hopper body (2), insulation cotton (3) and protective plate (4); the wear-resistant and corrosion-resistant castable layer (1) is set on the inner wall of the ash hopper body (2), and the insulation cotton (3) and protective plate (4) are set on the outer wall of the ash hopper body (2) from the inside to the outside.

2. The heat-insulating bag ash hopper according to claim 1, characterized in that, The surface of the wear-resistant and corrosion-resistant casting layer (1) is coated with a hydrophobic coating (5).

3. The heat-insulating bag ash hopper according to claim 1, characterized in that, The thickness of the wear-resistant and corrosion-resistant cast layer (1) decreases sequentially from the top of the ash hopper body (2) to the bottom of the ash hopper body (2).

4. The heat-insulating bag ash hopper according to any one of claims 1 to 3, characterized in that, The ash hopper body (2) is made of metal material.

5. The heat-insulating bag ash hopper according to claim 4, characterized in that, The inner wall of the ash hopper body (2) is provided with multiple angle irons (6), which are used to fix the wear-resistant and corrosion-resistant casting layer (1) inside the ash hopper body (2).

6. The heat-insulating bag ash hopper according to claim 5, characterized in that, The inner wall of the ash hopper body (2) is provided with interlaced horizontal plates (7) and vertical plates (8), and the wear-resistant and corrosion-resistant casting layer (1) is cast in the squares formed by the horizontal plates (7) and vertical plates (8).

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