Preparation method of pipeline heat preservation and insulation block

Abstract

The invention discloses a preparation method of a pipeline heat preservation and insulation block, and the pipeline heat preservation and insulation block prepared by the preparation method of the pipeline heat preservation and insulation block is prepared by mixing cement, fly ash, ceramsite, closed-cell expanded perlite, glass fiber chopped strands and water according to a certain proportion through the steps of dry mixing, wet mixing, mold forming and curing. The method is simple and convenient in process, raw materials are easy to obtain and low in cost, the pipeline heat insulation block prepared through the method can be used for a long time at the temperature of 700 DEG C, the normal-temperature heat conductivity coefficient is smaller than or equal to 0.25 W / (mK), the compressive strength is larger than or equal to 10 MPa, the breaking strength is larger than or equal to 4 MPa, and the dual requirements for strength and heat insulation can be met when the pipeline heat insulation block is used for a pipeline. The problem of energy loss caused by cracking and damage possibly occurring in the transportation, construction and use processes of the pipeline heat preservation and heat insulation block is solved, and the pipeline is effectively protected.

Description

Technical Field

[0001] The present invention belongs to the technical field of the preparation of pipeline thermal insulation blocks, and particularly relates to a method for preparing pipeline thermal insulation blocks. Background Art

[0002] In chemical industrial parks and residential areas, the transportation and transfer of energy are required. With the increasing improvement of environmental protection levels, the geographical locations of industries and living areas are getting farther and farther away, and the transportation distance of high-temperature media is also increasing. Therefore, pipeline thermal insulation has received more and more attention.

[0003] Due to the harsh natural environment, the limitations of transportation and construction conditions, and adverse factors such as the vibration of the pipeline itself, the cracking and damage of thermal insulation materials often occur, resulting in a large amount of heat being dissipated into the air, causing energy loss in the pipeline. In the long-term operation of the pipeline, even potential safety hazards are formed, making the existing thermal insulation blocks unable to effectively protect the pipeline. For this reason, we propose a method for preparing pipeline thermal insulation blocks. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for preparing pipeline thermal insulation blocks to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A method for preparing pipeline thermal insulation blocks, including the following steps: A. Dry mixing of raw materials: Add a preset amount of cement, fly ash, ceramsite, and closed-cell expanded perlite to the mixing tank. After the mixing tank starts mixing for more than 1 minute, add equal amounts of short glass fiber filaments in batches and multiple times, and then mix and stir for more than 1 minute to stir the raw materials until they are evenly mixed to obtain a dry-mixed product of raw materials. B. Wet mixing of raw materials: Add a preset amount of water to the mixing tank. Then, after the mixing tank starts mixing for more than 1 minute, stir and mix the water and the dry-mixed product of raw materials evenly to obtain a wet-mixed product of raw materials. C. Molding preparation: Transfer the obtained wet-mixed product of raw materials to the molding die with the assistance of a vibration platform or a rubber hammer, and make the wet-mixed product of raw materials uniformly and densely molded in the molding die to obtain a semi-finished product of pipeline thermal insulation blocks. D. Curing of finished products: Place the semi-finished product of pipeline thermal insulation blocks and the molding die as a whole naturally under a ventilation shelter for more than 12 hours to obtain the finished product of pipeline thermal insulation blocks. Demold and store the finished product of pipeline thermal insulation blocks in the warehouse or store it in the warehouse with the mold according to requirements.

[0006] Preferably, in step A, the mass ratio of cement, fly ash, ceramsite, closed-cell expanded perlite and chopped glass fiber is: 1-1.5: 0.5-1: 1-2: 0.1-0.2: 0.1-0.15.

[0007] Preferably, the cement is aluminate cement or portland cement.

[0008] Preferably, the fly ash is class I fly ash with a particle size of 200-300 mesh.

[0009] Preferably, the ceramsite is shale ceramsite with a diameter of 3-10 mm.

[0010] Preferably, the closed-cell expanded perlite has a particle size of 20-50 mesh.

[0011] Preferably, the length of the chopped glass fiber is 9-12 mm.

[0012] Preferably, in step A, the chopped glass fiber is added to the mixing tank in equal amounts in 5 batches or more.

[0013] Preferably, in step B, the total mass of the added water is 35%-40% of the total mass of the cement and fly ash, and the water is pollution-free groundwater or tap water.

[0014] Preferably, in step C, the wet-mixed raw material product is transferred to the forming mold within 20 minutes after the stirring stops.

[0015] Compared with the prior art, the beneficial effects of the present invention are: The pipeline thermal insulation block prepared by the preparation method of the pipeline thermal insulation block in the present invention is prepared by mixing cement, fly ash, ceramsite, closed-cell expanded perlite, chopped glass fiber and water in a certain proportion, and through the steps of dry mixing, wet mixing, mold forming and curing. This method is simple and convenient, and the raw materials are easy to obtain and inexpensive. The pipeline thermal insulation block prepared by the method of the present invention can be used for a long time at 700 °C, the thermal conductivity at normal temperature is ≤0.25 W / (m·K), the compressive strength is ≥10 MPa, and the flexural strength is ≥4 MPa. It can meet the dual requirements of strength and insulation when used on pipelines, solve the problems of cracking and damage that may occur during the transportation, construction and use of pipeline thermal insulation blocks, resulting in energy loss, and effectively protect the pipeline. Brief Description of the Drawings

[0016] Figure 1 It is a schematic flow chart of the method of the present invention. Detailed Embodiments

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] Please refer to Figure 1 , the preparation method of the pipeline thermal insulation block provided by the present invention includes the following steps: A. Dry mixing of raw materials: Add a preset amount of cement, fly ash, ceramsite, and closed-cell expanded perlite to the stirring tank. After the stirring tank starts stirring for more than 1 minute, add equal amounts of short glass fiber filaments in batches and multiple times, and then mix and stir for more than 1 minute to stir the raw materials until they are evenly mixed to obtain a dry-mixed product of raw materials; The mass ratio of cement, fly ash, ceramsite, closed-cell expanded perlite, and short glass fiber filaments is: 1 - 1.5: 0.5 - 1: 1 - 2: 0.1 - 0.2: 0.1 - 0.15; The cement is aluminate cement or portland cement; The fly ash is first-class fly ash with a particle size of 200 - 300 mesh; The ceramsite is shale ceramsite with a diameter of 3 - 10 mm; Closed-cell expanded perlite with a particle size of 20 - 50 mesh; The length of the short glass fiber filaments is 9 - 12 mm; The short glass fiber filaments are added to the stirring tank in 5 batches or more in equal amounts to avoid agglomeration of the short glass fiber filaments and make them more easily dispersed evenly in the mixture; Cement and fly ash are used as binders, ceramsite and closed-cell expanded perlite are used as thermal insulation lightweight aggregates, and short glass fiber filaments are used as strength enhancing materials B. Wet mixing of raw materials: Add a preset amount of water to the stirring tank. Then, after the stirring tank starts stirring for more than 1 minute, stir and mix the water and the dry-mixed product of raw materials evenly to obtain a wet-mixed product of raw materials; The total mass of the added water is 35% - 40% of the total mass of cement and fly ash, and the water is pollution-free groundwater or tap water; The function of water is to cause the hydration reaction between cement and fly ash, thereby bonding all the raw materials together; C. Molding preparation: Transfer the obtained wet-mixed product of raw materials to the molding die with the assistance of a vibrating platform or a rubber hammer. The transfer of the wet-mixed product of raw materials to the molding die is completed within 20 minutes after the stirring stops, so that the wet-mixed product of raw materials is evenly and densely molded in the molding die to obtain a semi-finished product of the pipeline thermal insulation block; D. Curing of finished products: Naturally place the semi-finished product of the pipeline thermal insulation block and the forming mold as a whole under a ventilation shelter for more than 12 hours to obtain the finished product of the pipeline thermal insulation block. Demold and store the finished product of the pipeline thermal insulation block in the warehouse or store it in the mold according to requirements.

[0019] Example 1: A. Dry mixing of raw materials: Add 550 g of aluminate cement, 380 g of fly ash, 570 g of ceramsite, and 40 g of closed-cell expanded perlite to the mixing tank. After the mixing tank starts stirring for 1 minute, add 30 g of short glass fiber filaments in 5 portions, and stir the raw materials for 1 minute until they are evenly mixed to obtain a dry-mixed product of raw materials; B. Wet mixing of raw materials: Add 370 g of tap water to the mixing tank, and then the mixing tank starts stirring for 2 minutes to make the water and the dry-mixed product of raw materials stir and mix evenly to obtain a wet-mixed product of raw materials; C. Forming preparation: Transfer the obtained wet-mixed product of raw materials to the forming mold by vibrating on the vibrating platform for 1 minute. The transfer of the wet-mixed product of raw materials to the forming mold is completed within 20 minutes after the stirring stops, so that the wet-mixed product of raw materials is evenly and densely formed in the forming mold to obtain a semi-finished product of the pipeline thermal insulation block; D. Curing the finished product: Naturally place the semi-finished product of the pipeline thermal insulation block and the forming mold as a whole under a ventilation shelter for more than 12 hours to obtain the finished product of the pipeline thermal insulation block. Demold and store the finished product of the pipeline thermal insulation block in the warehouse or store it in the mold according to requirements; The room temperature thermal conductivity of the finished product of the pipeline thermal insulation block obtained in Example 1 is 0.25 W / (m·K), the compressive strength is 11 MPa, and the flexural strength is 4 MPa.

[0020] Example 2: A. Dry mixing of raw materials: Add 520 g of aluminate cement, 380 g of fly ash, 580 g of ceramsite, and 40 g of closed-cell expanded perlite to the mixing tank. After the mixing tank starts stirring for 1 minute, add 28 g of short glass fiber filaments in 5 portions, and stir the raw materials for 1 minute until they are evenly mixed to obtain a dry-mixed product of raw materials; B. Wet mixing of raw materials: Add 370 g of tap water to the mixing tank, and then the mixing tank starts stirring for 2 minutes to make the water and the dry-mixed product of raw materials stir and mix evenly to obtain a wet-mixed product of raw materials; C. Forming preparation: Transfer the obtained wet-mixed product of raw materials to the forming mold by vibrating on the vibrating platform for 1 minute. The transfer of the wet-mixed product of raw materials to the forming mold is completed within 20 minutes after the stirring stops, so that the wet-mixed product of raw materials is evenly and densely formed in the forming mold to obtain a semi-finished product of the pipeline thermal insulation block; D. Curing the finished product: Naturally place the semi-finished product of the pipeline thermal insulation block and the forming mold as a whole under a ventilation shelter for more than 12 hours to obtain the finished product of the pipeline thermal insulation block. Demold and store the finished product of the pipeline thermal insulation block in the warehouse according to requirements or store it in the warehouse with the mold. The room temperature thermal conductivity of the finished product of the pipeline thermal insulation block obtained in Example 2 is 0.24 W / (m·K), the compressive strength is 11.5 MPa, and the flexural strength is 4.2 MPa.

[0021] Example 3: A. Dry mixing of raw materials: Add 520 g of portland cement, 380 g of fly ash, 580 g of ceramsite, and 40 g of closed-cell expanded perlite to the mixing tank. After the mixing tank starts stirring for 1 minute, add 30 g of chopped glass fiber filaments in 5 portions, and stir the raw materials for 1 minute until they are evenly mixed to obtain a dry-mixed product of raw materials. B. Wet mixing of raw materials: Add 370 g of tap water to the mixing tank, and then start stirring the mixing tank for 2 minutes to evenly mix the water and the dry-mixed product of raw materials to obtain a wet-mixed product of raw materials. C. Forming preparation: Transfer the obtained wet-mixed product of raw materials to the forming mold by vibrating on a vibrating platform for 1 minute. The transfer of the wet-mixed product of raw materials to the forming mold is completed within 20 minutes after the stirring stops, so that the wet-mixed product of raw materials is evenly and densely formed in the forming mold to obtain a semi-finished product of the pipeline thermal insulation block. D. Curing the finished product: Naturally place the semi-finished product of the pipeline thermal insulation block and the forming mold as a whole under a ventilation shelter for more than 12 hours to obtain the finished product of the pipeline thermal insulation block. Demold and store the finished product of the pipeline thermal insulation block in the warehouse according to requirements or store it in the warehouse with the mold. The room temperature thermal conductivity of the finished product of the pipeline thermal insulation block obtained in Example 3 is 0.25 W / (m·K), the compressive strength is 11.5 MPa, and the flexural strength is 4.2 MPa.

[0022] The pipeline thermal insulation block prepared by the preparation method of the pipeline thermal insulation block in the present invention is prepared by mixing cement, fly ash, ceramsite, closed-cell expanded perlite, chopped glass fiber filaments and water in a certain proportion through dry mixing, wet mixing, mold forming and curing steps. This method has simple and convenient process and easily available and low-cost raw materials. The pipeline thermal insulation block prepared by the method of the present invention can be used for a long time at 700 °C, the room temperature thermal conductivity ≤ 0.25 W / (m·K), the compressive strength ≥ 10 MPa, and the flexural strength ≥ 4 MPa. It can meet the dual requirements of strength and heat preservation when used on pipelines, solve the problems of cracking and breakage that may occur during the transportation, construction and use of pipeline thermal insulation blocks and cause energy loss, and effectively protect the pipeline.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a pipeline thermal insulation block, characterized in that: The steps include: A. Dry mixing of raw materials: Add a preset amount of cement, fly ash, ceramsite and closed-cell expanded perlite into the mixing tank, start stirring the mixing tank for more than 1 minute, then add an equal amount of chopped glass fiber in batches for multiple times, then mix and stir for more than 1 minute, stir the raw materials until they are evenly mixed, and obtain a raw material dry mix product; B. Raw material wet mixing: Add a preset amount of water into the mixing tank, then start stirring the mixing tank for more than 1 minute to mix the water and the raw material dry mix product evenly to obtain the raw material wet mix product; C. Molding preparation: The obtained raw material wet mixed product is transferred to the forming mold with the assistance of a vibrating platform or a rubber hammer, so that the raw material wet mixed product is evenly and densely formed in the forming mold to obtain a semi-finished pipeline thermal insulation block; D. Maintenance of finished products: Place the semi-finished pipe thermal insulation block and the forming mold as a whole naturally under a ventilated shelter for more than 12 hours to obtain the finished pipe thermal insulation block. The finished pipe thermal insulation block can be demolded and stored or stored with the mold as needed.

2. The method for preparing a pipeline thermal insulation block according to claim 1, characterized in that: In step A, the mass ratio of cement, fly ash, ceramsite, closed-cell expanded perlite and chopped glass fiber strands is: 1-1.5: 0.5-1: 1-2: 0.1-0.2: 0.1-0.

15.

3. The method for preparing a pipeline thermal insulation block according to claim 2, characterized in that: The cement is aluminate cement or silicate cement.

4. The method for preparing a pipeline thermal insulation block according to claim 2, characterized in that: The fly ash is first-grade fly ash with a particle size of 200-300 meshes.

5. The method for preparing a pipeline thermal insulation block according to claim 2, characterized in that: The ceramsite is shale ceramsite with a diameter of 3-10 mm.

6. The method for preparing a pipeline thermal insulation block according to claim 2, characterized in that: The closed-cell expanded perlite has a particle size of 20-50 meshes.

7. The method for preparing a pipeline thermal insulation block according to claim 2, characterized in that: The length of the chopped glass fiber strands is 9-12 mm.

8. The method for preparing a pipeline thermal insulation block according to claim 7, characterized in that: In step A, chopped glass fibers are added to a mixing tank in equal amounts in 5 or more batches.

9. The method for preparing a pipeline thermal insulation block according to claim 1, characterized in that: In step B, the total mass of water added is 35%-40% of the total mass of cement and fly ash, and the water is uncontaminated ground water or tap water.

10. The method for preparing a pipeline thermal insulation block according to claim 1, characterized in that: In step C, the wet mixed product of the raw materials is transferred to the molding mold within 20 minutes after the stirring stops.

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