Hot air pipeline masonry structure

Abstract

A hot air pipeline masonry structure comprises a hot air pipeline and is characterized in that a layer of working bricks, a layer of insulating bricks, a layer of spraying paint and a layer of nano-plates are sequentially arranged in the hot air pipeline from inside to outside to a hot air pipeline shell, and the nano-plates are installed on the inner side of the hot air pipeline shell; an expansion gap is formed between the insulating brick and the spray coating; and brick joints are reserved between the working bricks and the insulating bricks. The hot air pipeline masonry structure has the advantages that the masonry structure is simplified, the diameter of the pipeline is correspondingly reduced, the workload of masonry and the risk point of quality control are reduced, the project investment is saved, and the service life of the hot air pipeline is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a hot air pipeline, in particular to a hot air pipeline masonry structure. BACKGROUND

[0002] The hot blast produced by the modern blast furnace hot blast stove is usually at 1150-1250 DEG C, a small amount of hot blast stove can reach 1300 DEG C or even higher blast temperature, and the hot blast pressure is usually about 0.45MPa. The function of the hot air pipeline is to deliver the hot air from the hot blast stove to the blast furnace, including hot air branch pipe, hot air main pipe and hot air surrounding pipe, which is usually placed horizontally or nearly horizontally. The top combustion type hot blast stove is connected by hot air vertical pipe, elephant trunk pipe and other vertical pipes to eliminate the height difference between the hot air outlet and the hot air surrounding pipe. Because the temperature and pressure of the hot air are relatively high, considering the production safety, engineering investment, service life, pipe shell surface temperature and other factors, in engineering practice, the masonry structure of the hot air pipeline is usually sequentially from inside to outside one layer of working brick (high alumina brick, thickness is generally 140-210mm), one layer or two layers of insulation brick (high alumina refractory brick, clay refractory brick, thickness is generally 114-230mm), one layer or two layers of sprayed material (heavy sprayed material, light sprayed material, thickness is generally 50-100mm). Between the insulation brick and the sprayed material, or between the working brick and the insulation brick, an expansion joint (in the upper half ring of the hot air pipeline, filled with ceramic fiber, thickness is generally 10-25mm, the thickness of the insulation brick or the sprayed material is correspondingly reduced) is usually arranged to absorb the thermal expansion of the refractory material. Under the highest blast temperature working condition, the pipe shell surface temperature of the hot air pipeline is usually required to be ≤150 DEG C. Because the diameter of the hot air pipeline is relatively large and relatively long, taking the 2500m 3 high blast furnace as an example, the hot air pipeline shell surface area is about 1600m 2 , and the heat loss is relatively large.

[0003] To minimize the heat loss of hot blast pipe, the common method is to thicken the hot blast pipe refractory to appropriately reduce the surface temperature of the hot blast pipe shell. For example, to reduce to 120 DEG C, under the condition of hot blast temperature 1250 DEG C and ambient temperature 25 DEG C, the total thickness of the hot blast pipe refractory is about 440 mm (including: a layer of 200 mm working brick, two layers of 179 mm insulating brick, a layer of 55 mm sprayed material, 6 mm brick joint). If it is reduced to 100 DEG C, the total thickness of the hot blast pipe refractory is about 519 mm (including: a layer of 200 mm working brick, two layers of 228 mm insulating brick, a layer of 85 mm sprayed material, 6 mm brick joint). Increasing the thickness of the refractory not only increases the project investment, but also often increases the number of layers of the refractory masonry, making the masonry structure more complex, thereby increasing the workload of masonry and the risk points of quality control. The diameter of the hot blast pipe shell also needs to be expanded accordingly, thereby increasing the surface area of the pipe shell, which is not conducive to reducing heat loss. In addition, due to the high temperature and high pressure working conditions of the hot blast pipe, especially the working conditions of the upper half ring compared to the lower half ring of the working brick of the hot blast pipe, from the theoretical analysis and production practice, the working brick of the upper part of the hot blast pipe is prone to sinking, damage and other problems. It is not very reasonable to select the same brand of high alumina brick in the engineering design. Figure 1 A schematic diagram of the common hot blast pipe masonry structure, wherein the hot blast passes through the center of the pipe, and from the center of the pipe to the shell, a layer of working brick, two layers of insulating brick, two layers of sprayed material, and an expansion joint are sequentially provided.

[0004] Therefore, the known hot blast pipe masonry structure has the above-mentioned various inconveniences and problems. Content of the utility model

[0005] The utility model discloses a safe and reliable hot blast pipe masonry structure.

[0006] To achieve the above-mentioned purpose, the technical solution of the utility model is:

[0007] A hot blast pipe masonry structure, comprising a hot blast pipe, characterized in that:

[0008] A layer of working brick, a layer of insulating brick, a layer of sprayed material and a layer of nanometer plate are sequentially provided from inside to outside to the shell of the hot blast pipe, and the nanometer plate is installed on the inside of the shell of the hot blast pipe; an expansion joint is provided between the insulating brick and the sprayed material; a brick joint is left between the working brick and the insulating brick.

[0009] The hot blast pipe masonry structure of the utility model can also be further realized by adopting the following technical measures.

[0010] The aforementioned hot blast pipe masonry structure, wherein the lower half circle brick of the working brick adopts a conventional brand, and the upper half circle brick adopts a brand with higher creep temperature grade and strength index.

[0011] The hot blast pipe masonry structure as claimed in the preceding claim, wherein the nanometer plate is a thermal conductivity material with a thermal conductivity coefficient significantly lower than that of ceramic fiber.

[0012] The hot blast pipe masonry structure as claimed in the preceding claim, wherein the nanometer plate is installed in the whole circle of the hot blast pipe or the upper half circle of the hot blast pipe and is covered by the inner spraying material.

[0013] After the technical scheme is applied, the hot blast pipe masonry structure has the following advantages:

[0014] 1. The masonry structure is simplified, and the diameter of the pipe is correspondingly reduced.

[0015] 2. The workload of masonry and the risk points of quality control are reduced.

[0016] 3. The engineering investment is saved, and the service life of the hot blast pipe is prolonged.

[0017] 4. The surface temperature of the pipe shell is reduced, the surface area of the pipe is reduced, and thus the heat loss of the hot blast pipe is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic view of a common hot blast pipe masonry structure;

[0019] Figure 2 It is a schematic view of the hot blast pipe masonry structure of the embodiment of the utility model. DETAILED DESCRIPTION

[0020] The utility model will be further described below in combination with the embodiments and the drawings thereof.

[0021] Embodiment 1

[0022] Please refer to Figure 2 The hot blast pipe masonry structure of the utility model comprises a hot blast pipe.

[0023] From the inside to the outside of the hot blast pipe, a layer of working brick (the upper half ring 11 and the lower half ring 1), a layer of thermal insulation brick 2, a layer of spraying material 3, a layer of nanometer plate 12 are sequentially arranged in the hot blast pipe shell 5, the nanometer plate is installed on the inner side of the hot blast pipe shell; the expansion joint 12 is arranged between the thermal insulation brick and the spraying material; the brick joint is left between the working brick and the thermal insulation brick. The lower half circle of the working brick adopts a conventional grade, and the upper half circle of the brick adopts a grade with a higher creep temperature and strength index. The nanometer plate is a thermal conductivity material with a thermal conductivity coefficient significantly lower than that of ceramic fiber. The nanometer plate is installed in the whole circle of the hot blast pipe or the upper half circle of the hot blast pipe and is covered by the inner spraying material.

[0024] Embodiment 2

[0025] The construction method of the hot air duct masonry structure of this utility model:

[0026] From the inside out, the layers are as follows: a layer of working bricks 1 and 11 (high-alumina bricks, typically 140-210mm thick), a layer of insulating bricks 2 (high-alumina or clay insulating bricks, typically 65-114mm thick), a layer of spray coating 3 (heavy or light spray coating, typically 50-100mm thick), and a layer of nano-board 12 (typically 10-20mm thick, installed around the inside of the hot air duct shell and covered by the inner spray coating 3). An expansion joint 4 (filled with ceramic fiber, typically 10-25mm thick, in the upper half of the hot air duct ring) is provided between the insulating bricks 2 and 11 and the insulating bricks 2. A brick joint (typically 2-3mm thick) is left between the working bricks 1 and 11 and the insulating bricks 2. Among them, working bricks 1 and 11 use two grades. When the maximum temperature of hot air 6 is 1250℃, the lower half ring brick 1 can use high alumina brick of grade DRL-135, while the upper half ring brick 11 can use high alumina brick of grade DRL-140 or DRL-145.

[0027] This utility model has substantial features and significant technological advancements. The hot air duct masonry structure of this utility model significantly reduces the thickness of the refractory material (from 519mm to 410mm) by applying nanoplates with very low thermal conductivity, reducing the number of brick layers (from 3 layers to 2 layers), thus simplifying the masonry structure and correspondingly reducing the pipe diameter. This not only reduces the workload and quality control risks during construction but also saves on project investment. This utility model also lowers the surface temperature of the pipe shell (from 100℃ to 95℃) and reduces the pipe surface area, significantly reducing heat loss in the hot air duct. The upper ring working bricks use higher-grade high-alumina bricks to prevent problems such as sinking and damage of the upper working bricks in the hot air duct, extending the service life of the hot air duct.

[0028] The above embodiments are for illustrative purposes only and are not intended to limit the scope of this utility model. Those skilled in the art can make various modifications and variations without departing from the spirit and scope of this utility model. Therefore, all equivalent technical solutions should also fall within the scope of this utility model and should be defined by the claims.

Claims

1. A hot blast pipe masonry structure comprising a hot blast pipe, characterized in that: from inside to outside of the hot blast pipe to the hot blast pipe shell (5), there are successively arranged a layer of working bricks, a layer of heat preservation bricks (2), a layer of sprayed material (3), and a layer of nano plates (12), the nano plates (12) being installed on the inside of the hot blast pipe shell (5); an expansion joint (4) is arranged between the heat preservation bricks (2) and the sprayed material (3); a brick joint is left between the working bricks and the heat preservation bricks (2).

2. The hot blast pipe masonry structure according to claim 1, characterized in that the lower half ring bricks (1) of the working bricks are made of DRL-135 brand high alumina bricks, and the upper half ring bricks (11) are made of DRL-140 or DRL-145 brand high alumina bricks with higher creep temperature grade and strength index. the nano plates (12) are heat preservation materials with a thermal conductivity coefficient significantly lower than that of ceramic fibers.

3. The hot blast pipe masonry structure as claimed in claim 1, wherein the nano plates (12) are installed in a whole circle in the hot blast pipe, or are installed in the upper half circle of the hot blast pipe and are covered by the sprayed material on the inside.

4. The hot blast pipe masonry structure as claimed in claim 1, wherein ​

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