A waste heat boiler supplementary combustion device

Abstract

The utility model provides a post-combustion device for a waste heat boiler, comprising a post-combustion pipeline and a burner, the post-combustion pipeline comprising a first steel pipe, the outlet of the first steel pipe is connected to the hot flue gas inlet of the waste heat boiler, the inner wall of the first steel pipe is provided with a thermal insulation expansion layer, the inner wall of the thermal insulation expansion layer is provided with a first refractory brick layer, the inlet of the first steel pipe is provided with a plugging portion, the plugging portion comprises a second refractory brick layer, one side of the second refractory brick layer is provided with a thermal insulation layer, the second refractory brick layer and the thermal insulation layer are penetrated by a second steel pipe inside, the inlet of the second steel pipe is connected to the burner, the burner can make the gas in the post-combustion pipeline fully burn, the heat generated by the post-combustion machine is transported to the first refractory brick layer through the second steel pipe, and then transported from the first refractory brick layer to the boiler, which greatly reduces the heat dissipation to the outside and improves the utilization rate of the heat.

Description

Technical Field

[0001] The utility model relates to the technical field of connecting pipes, in particular to a post-combustion device for a waste heat boiler. Background Art

[0002] At present, some boilers use the high-temperature flue gas generated by coal-fired power plants to heat the boilers. However, for some large boilers, heating only by relying on the high-temperature flue gas generated by coal-fired power plants has low heating efficiency and long working time. Usually, a supplementary heat machine needs to be added. The heat generated by the supplementary heat machine needs to be input into the boiler. The connecting pipes for transporting heat between the supplementary heat machine and the boiler currently dissipate more heat outward, resulting in heat waste. In view of this, overcoming the defects of the above-mentioned prior art is a problem that needs to be urgently solved in this technical field. Utility Model Content

[0003] The utility model provides a post-combustion device for a waste heat boiler, aiming to improve the problem that a connecting pipe for conveying heat between a current post-combustion machine and a boiler dissipates more heat outwards, resulting in heat waste.

[0004] In order to achieve the above purpose, the utility model provides a waste heat boiler supplementary combustion device, and the specific technical scheme is as follows:

[0005] A post-combustion device for a waste heat boiler comprises a post-combustion pipeline and a burner, wherein the post-combustion pipeline comprises a first steel pipe, the outlet of the first steel pipe is connected to the hot flue gas inlet of the waste heat boiler, the inner wall of the first steel pipe is provided with a thermal insulation expansion layer, the inner wall of the thermal insulation expansion layer is provided with a first refractory brick layer, the inlet of the first steel pipe is provided with a plugging portion, the plugging portion comprises a second refractory brick layer, one side of the second refractory brick layer is provided with an insulation layer, a second steel pipe is penetrated inside the second refractory brick layer and the insulation layer, the inlet of the second steel pipe is connected to the burner, and the burner can fully burn the gas in the post-combustion pipeline.

[0006] In one of the embodiments, a connecting portion is provided at the inlet end of the first steel pipe, and the first steel pipe can be fixedly connected to the burner through the connecting portion. The connecting portion includes a connecting plate, and a through hole is provided on the connecting plate. Bolts can be fixedly connected to the burner through the through hole, and the second steel pipe passes through the interior of the connecting plate.

[0007] In one of the embodiments, a groove is formed on the outer end surface of the connecting disk, and a sealing ring is disposed in the groove.

[0008] In one embodiment, the first refractory brick layer and the second refractory brick layer are both rings formed by splicing refractory bricks, and the refractory bricks are wedge-shaped.

[0009] In one embodiment, the second refractory brick layer and the thermal insulation layer are both arranged inside the first refractory brick layer, and the thermal insulation layer is arranged outside the second refractory brick layer.

[0010] The beneficial effects of this embodiment are:

[0011] Because the technical means of supplementary combustion of the waste heat boiler burner is adopted, the technical problem of unburned combustible gas in the flue gas of the rare earth roasting kiln is overcome, and the evaporation amount of the boiler is increased, thereby achieving the technical effect of energy saving and efficiency improvement. There is a supplementary combustion flue between the burner and the waste heat boiler, and the interior of the supplementary combustion flue is provided with a thermal insulation expansion layer, and the interior of the thermal insulation expansion layer is provided with a first refractory brick layer, and the interior of the first refractory brick layer close to the burner is provided with a second refractory brick layer and a thermal insulation layer, and the second refractory brick layer and the thermal insulation layer are provided with a second steel pipe. The heat generated by the burner is transported to the interior of the first refractory brick layer, and then transported from the first refractory brick layer to the waste heat boiler, which greatly reduces the heat dissipation to the outside and improves the utilization rate of the heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a schematic diagram of the reverse flow of heat in a pipeline provided by an embodiment of the utility model;

[0014] Figure 2 for Figure 1 This is the enlarged view of point A;

[0015] Figure 3 A schematic diagram of a pipeline cross section provided for an embodiment of the utility model;

[0016] Figure 4 Schematic diagram of the position relationship between the supplementary combustion pipeline and the connecting part provided in the embodiment of the utility model Figure 1 ;

[0017] Figure 5 Schematic diagram of the position relationship between the supplementary combustion pipeline and the connecting part provided in the embodiment of the utility model Figure 2 ;

[0018] Figure 6 This is a diagram of the sealing ring and the connecting disk being separated from each other in an embodiment of the present utility model.

[0019] Description of reference numerals:

[0020] 100, supplementary combustion pipeline; 110, first steel pipe; 120, thermal insulation expansion layer; 130, first refractory brick layer;

[0021] 200, plugging part; 210, second refractory brick layer; 220, insulation layer; 230, second steel pipe;

[0022] 300, connecting portion; 310, connecting plate; 320, through hole; 330, groove; 340, sealing ring;

[0023] 400. Burner. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] The technical solution provided by the embodiment of the utility model is introduced below in conjunction with the accompanying drawings.

[0026] See also Figure 1 , Figure 2 and Figure 3 , an embodiment of the utility model provides a post-combustion device for a waste heat boiler, including a post-combustion pipeline 100 and a burner 400, the burner 400 is preferably a gas burner, the fuel is natural gas or other combustible gas, the post-combustion pipeline 100 includes a first steel pipe 110, the first steel pipe 110 is a steel cylinder, the thickness is 2mm-5mm, and provides support for the post-combustion pipeline 100, the outlet of the first steel pipe 110 is connected to the boiler hot gas inlet pipeline, the inner wall of the first steel pipe 110 is provided with a thermal insulation expansion layer 120, the thermal insulation expansion layer 120 is 20mm-30mm, it should be noted that the thermal insulation expansion layer 120 is a highly efficient thermal insulation material, which is widely used in various pipeline systems to reduce the loss of heat energy and improve the operating efficiency of the system, at present, the mainstream foam insulation pipes are nitrile foam insulation pipes, polyethylene foam insulation pipes and EPDM (ethylene propylene rubber) foam insulation pipes;

[0027] The waste heat boiler utilizes the flue gas generated by the rare earth roasting kiln for heating. However, the combustible gas in the flue gas of the existing rare earth roasting kiln is not completely burned, resulting in a waste of resources and increasing the evaporation amount of the boiler. By adding the burner 400, the combustible gas in the flue gas can be fully burned, thereby improving the resource utilization rate and providing more heat to the boiler, thereby greatly improving the working efficiency.

[0028] See also Figure 1 , Figure 2 and Figure 3A first refractory brick layer 130 is provided on the inner wall of the thermal insulation expansion layer 120. The first refractory brick layer 130 has a thickness of 150 mm to 200 mm and is formed by stacking wedge-shaped refractory bricks (such as Figure 3 As shown in the figure), refractory bricks are referred to as fire bricks. They are refractory materials made of refractory clay or other refractory raw materials. They are light yellow or brownish. They are mainly used to build smelting furnaces and can withstand high temperatures of 1580℃-1770℃. They are also called fire bricks. They are refractory materials with certain shapes and sizes. According to the preparation process, they can be divided into fired bricks, unfired bricks, fused bricks (fused casting bricks), and refractory insulation bricks. According to the shape and size, they can be divided into standard bricks, ordinary bricks, special bricks, etc. They can be used as high-temperature building materials and structural materials for building kilns and various thermal equipment, and can withstand various physical and chemical changes and mechanical effects at high temperatures, such as refractory clay bricks, high-alumina bricks, silica bricks, and magnesium bricks.

[0029] See also Figure 1 and Figure 2 The inlet of the first steel pipe 110 is provided with a plugging portion 200, and the plugging portion 200 includes a second refractory brick layer 210, the thickness of the second refractory brick layer 210 is 200mm-250mm, and it is built of refractory bricks. The outer side of the second refractory brick layer 210 is provided with an insulation layer 220, and the thickness of the insulation layer 220 is

[0030] The thickness of the second steel pipe 230 is 50mm-100mm, the second refractory brick layer 210 and the thermal insulation layer 220 are both arranged inside the first refractory brick layer 130, and the thermal insulation layer 220 is arranged outside the second refractory brick layer 210, and the second refractory brick layer 210 and the thermal insulation layer 220 are penetrated by the second steel pipe 230, the thickness of the second steel pipe 230 is 2mm-5mm, and the inlet of the second steel pipe 230 is connected to the outlet of the supplementary heat machine (such as a burner).

[0031] See also Figure 4 , Figure 5 and Figure 6 Preferably, a connecting portion 300 is provided at the inlet end of the first steel pipe 110, and the first steel pipe 110 can be fixedly connected to the burner through the connecting portion 300. The connecting portion 300 includes a connecting plate 310, and a through hole 320 is opened on the connecting plate 310. Bolts can be fixedly connected to the burner through the through hole 320, so that the first steel pipe 110 can be quickly connected and separated from the burner, which is convenient for work and greatly improves work efficiency. The second steel pipe 230 runs through the interior of the connecting plate 310 to achieve a fixed connection between the pipeline and the heat supplement machine. In addition, a groove 330 is opened on the outer end surface of the connecting plate 310, and a sealing ring 340 is arranged in the groove 330. The sealing ring is made of high temperature resistant material (such as polytetrafluoroethylene) to prevent heat from being dissipated from the gap at the connection between the connecting plate 310 and the burner, thereby reducing heat waste and improving energy utilization.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A post-combustion device for a waste heat boiler, comprising a post-combustion pipeline (100) and a burner (400), characterized in that: The supplementary combustion pipeline (100) comprises a first steel pipe (110), the outlet of the first steel pipe (110) is connected to the hot flue gas inlet of the waste heat boiler, the inner wall of the first steel pipe (110) is provided with a thermal insulation expansion layer (120), the inner wall of the thermal insulation expansion layer (120) is provided with a first refractory brick layer (130), the inlet of the first steel pipe (110) is provided with a blocking portion (200), the blocking portion (200) comprises a second refractory brick layer (210), a thermal insulation layer (220) is provided on one side of the second refractory brick layer (210), a second steel pipe (230) penetrates the interior of the second refractory brick layer (210) and the thermal insulation layer (220), the inlet of the second steel pipe (230) is connected to a burner (400), and the burner (400) can make the gas in the supplementary combustion pipeline (100) fully burn.

2. A waste heat boiler supplementary combustion device according to claim 1, characterized in that: The inlet end of the first steel pipe (110) is provided with a connecting portion (300), and the first steel pipe (110) can be fixedly connected to the burner (400) through the connecting portion (300). The connecting portion (300) includes a connecting plate (310), and the connecting plate (310) is provided with a through hole (320). Bolts can be fixedly connected to the burner (400) through the through hole (320), and the second steel pipe (230) passes through the interior of the connecting plate (310).

3. A waste heat boiler supplementary combustion device according to claim 2, characterized in that: The outer end surface of the connection disk (310) is provided with a groove (330), and a sealing ring (340) is arranged in the groove (330).

4. A waste heat boiler supplementary combustion device according to claim 3, characterized in that: The first refractory brick layer (130) and the second refractory brick layer (210) are both circular rings formed by splicing refractory bricks, and the refractory bricks are wedge-shaped.

5. The waste heat boiler supplementary combustion device according to claim 1, characterized in that: The second refractory brick layer (210) and the thermal insulation layer (220) are both arranged inside the first refractory brick layer (130), and the thermal insulation layer (220) is arranged outside the second refractory brick layer (210).

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