Winter blast furnace refractory masonry insulation construction method
By using steam sources and preheating sheds for construction materials in winter blast furnace construction, and setting up industrial air heaters and rock wool quilts on site for local insulation, the problem of low construction environment temperature in winter is solved, efficient insulation and safe construction are achieved, and construction period and cost are saved.
Patent Information
- Application Number
- CN202510164052.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-14
- Publication Date
- 2025-05-06
AI Technical Summary
In winter blast furnace construction, too low ambient temperature will affect the quality of refractory masonry, and the existing insulation methods have problems such as safety hazards, occupying working space, and extending construction cycles.
The steam source and preheating shed are used to preheat the construction materials, and local insulation is used on the construction site to ensure that the construction environment temperature is above 5℃.
It achieves efficient insulation, ensures construction quality and safety, saves working space and construction time, and reduces costs.
Smart Images
Figure CN119932238A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of blast furnace construction, in particular to a construction method for refractory masonry insulation of a blast furnace in winter. Background Art
[0002] During winter construction, in order to ensure the quality and durability of blast furnace masonry, the ambient temperature of blast furnace refractory masonry construction must be guaranteed to be above 5°C. If winter construction is carried out, too low ambient temperature will directly affect the quality of refractory masonry, and then affect the service life of the blast furnace. The commonly used practices at present are: 1. Install high-power iodine tungsten lamps, heating rods and other equipment in the furnace for irradiation and heating; 2. Install a ring pipe in the furnace, pass steam in the pipe, or directly pass steam in the cooling wall for insulation. However, the above methods all have defects: Method 1 The insulation effect is not obvious, and the use of high-power iodine tungsten lamps, heating rods, etc. in a confined space poses a great safety hazard; Method 2 The pipeline is installed in the furnace, occupying limited working space, affecting work efficiency, and it is easy to touch the pipeline during hoisting, and the risk of personnel scalding is relatively high. The method of passing steam in the cooling wall has a relatively good insulation effect, does not affect the space in the furnace, and has a small safety hazard, but it takes up the main line construction time, and requires the cooling wall pipe system to be fully constructed and pressure tested before insulation construction can be carried out. At the same time, after the masonry is completed, the pipes need to be pickled and pre-coated. The addition of this construction step may extend the entire construction period and increase construction costs.
[0003] Therefore, it is necessary to develop a construction method for winter blast furnace refractory masonry insulation that has good thermal insulation effect, is safe and environmentally friendly, and saves construction time. Summary of the invention
[0004] The present invention aims to solve the above-mentioned problem, thereby providing a construction method for blast furnace refractory masonry insulation in winter with better thermal insulation effect.
[0005] The present invention solves the above-mentioned problem by adopting the following technical solution: A construction method for refractory masonry insulation of blast furnace in winter, comprising the following steps: S1: Install the steam source and preheating shed. The steam source is responsible for heating the preheating shed and transporting the construction materials to the preheating shed for insulation.
[0006] S2: When transporting construction materials to the construction site, use blankets to cover them to reduce heat loss.
[0007] S3: When building below the iron mouth of the blast furnace, the inspection port and the entrance of the furnace top chute are blocked with rock wool, and an industrial heater is placed at the iron mouth. Except for the air vents for feeding, the other air vents are blocked with rock wool.
[0008] S4: When building above the iron mouth of the blast furnace, the inspection port and the entrance of the furnace top chute are blocked with rock wool, and industrial heaters are installed at two to three blast furnace tuyere. Except for the tuyere for feeding and the tuyere for placing the heater, the other tuyere and iron mouth are blocked with rock wool.
[0009] S5: A slurry mixing station is set up on the iron-making yard platform, and the steam source is responsible for preheating the water required for mixing construction in the slurry mixing station.
[0010] Compared with the prior art, the present invention adopting the above technical solution has the following outstanding features: The whole system is insulated to ensure the quality of refractory masonry of the blast furnace; to ensure the safety of construction personnel during the construction process, and to avoid the risks of burns, fires, etc. that may occur due to construction operation errors; to avoid occupying the operating space in the furnace, making construction more convenient; and to improve construction efficiency as a whole, saving construction time and construction costs.
[0011] Preferably, a further technical solution of the present invention is: Furthermore, the construction materials are transported to the preheating shed at least three days in advance for preheating.
[0012] Furthermore, when the blast furnace is being built, a thermometer is installed at the gap of the cooling wall inside the blast furnace.
[0013] Furthermore, the outside air temperature, the temperature at the work place and around the lining, the temperature in the preheating shed where the heating material is located, and the temperature of the monolithic refractory materials during mixing, use and curing are measured every 4 hours.
[0014] Furthermore, when measuring the temperature of the monolithic refractory material, the temperature measuring instrument is placed in the material body for no less than 3 minutes. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic diagram of the construction method of an embodiment of the present invention; DETAILED DESCRIPTION
[0016] The present invention will be further described below in conjunction with embodiments, the purpose of which is only to provide a better understanding of the content of the present invention. Therefore, the examples given do not limit the protection scope of the present invention.
[0017] A construction method for refractory masonry insulation of blast furnace in winter, comprising the following steps: S1: Install steam source and preheating shed. The steam source is responsible for heating the preheating shed. Transport construction materials to the preheating shed for insulation. Construction materials should be transported to the preheating shed for preheating at least three days in advance. Refractory bricks and prefabricated blocks should be preheated to above 0°C before masonry. The preheating shed uses a rock wool blanket and steam exhaust pipe heating method. If Party A has a steam source, steam will be directly led to the preheating shed at the steam source. If Party A does not have a steam source, the construction party needs to provide steam with its own steam boiler as a steam source. The closer the transportation distance between the preheating shed and the blast furnace body, the better.
[0018] S2: When transporting construction materials to the construction site, use quilts to cover them to reduce heat loss. During the construction process, before the refractory materials are hoisted into the furnace, if they need to be temporarily parked on the iron-making platform for a long time, they can also be covered with canvas and heated by a heater for insulation.
[0019] S3: When building a blast furnace, the temperature at the work place and around the masonry should not be lower than 5°C. When building below the iron mouth of the blast furnace, the inspection port and the entrance of the furnace top chute should be blocked with rock wool, and an industrial heater should be placed at the iron mouth. Except for the air vents used for feeding, the other air vents should be blocked with rock wool.
[0020] S4: When building above the iron mouth of the blast furnace, the inspection port and the entrance of the furnace top chute are blocked with rock wool, and industrial heaters are installed at two to three tuyere of the blast furnace. Except for the tuyere for feeding and the tuyere for placing heaters, the other tuyere and iron mouth are blocked with rock wool. During the construction process, the number of industrial heaters can be increased at the tuyere according to the temperature measurement results to ensure the construction environment temperature.
[0021] When the blast furnace is being built, a thermometer is installed in the gap of the cooling wall inside the blast furnace.
[0022] S5: A mud mixing station is set up on the iron-casting platform. The temperature during the construction of refractory castables should not be lower than 5°C, but the temperature during the construction of clay-bonded refractory castables, water glass refractory castables, and phosphate refractory castables should not be lower than 10°C. There are specific restrictions on the water temperature for modulating refractory castables. For example, the water temperature of silicate cement refractory castables should not exceed 60°C, and the water temperature of high-alumina cement refractory castables should not exceed 30°C. A water tank is set in the mud mixing station. The steam source is responsible for preheating the water required for mixing construction in the mud mixing station. The steam source is connected to a hose connected to the water tank. After the water is preheated, a mixer is used to mix the amorphous refractory castables.
[0023] During winter construction, a thermometer should be used to make special construction records, and the following regulations should be met: 1. The external air temperature, the temperature of the work place and the surrounding of the lining, the temperature in the preheating shed where the heating material is located, and the temperature of the amorphous refractory during mixing, use and curing are measured every 4 hours; 2. All measuring points should be numbered and a temperature measuring point layout diagram should be drawn; 3. When measuring the temperature of amorphous refractory materials, the temperature gauge should be placed in the material for no less than 3 minutes.
[0024] The whole system is insulated to ensure the quality of refractory masonry of the blast furnace; to ensure the safety of construction personnel during the construction process, and to avoid the risks of burns, fires, etc. that may occur due to construction operation errors; to avoid occupying the operating space in the furnace, making construction more convenient; and to improve construction efficiency as a whole, saving construction time and construction costs.
[0025] The above description is only a preferred feasible embodiment of the present invention, and does not limit the scope of rights of the present invention. All equivalent changes made using the contents of the present specification and its drawings are included in the scope of rights of the present invention.
Claims
1. A construction method for refractory masonry insulation of blast furnace in winter, characterized by: The steps include: S1: Install the steam source and preheating shed. The steam source is responsible for heating the preheating shed and transporting the construction materials to the preheating shed for insulation; S2: When transporting construction materials to the construction site, use blankets to cover them to reduce heat loss; S3: When building below the iron mouth of the blast furnace, the inspection port and the entrance of the furnace top chute are blocked with rock wool, and an industrial heater is placed at the iron mouth. Except for the air vents for feeding, the other air vents are blocked with rock wool; S4: When building above the blast furnace iron mouth, the inspection port and the entrance of the furnace top chute are blocked with rock wool, and industrial heaters are installed at two to three blast furnace tuyere. Except for the tuyere for feeding and the tuyere for placing the heater, the other tuyere and iron mouth are blocked with rock wool; S5: A slurry mixing station is set up on the iron-making yard platform, and the steam source is responsible for preheating the water required for mixing construction in the slurry mixing station.
2. The construction method for refractory masonry insulation of blast furnace in winter according to claim 1, characterized in that: Construction materials should be transported to the preheating shed for preheating at least three days in advance.
3. The construction method for refractory masonry insulation of blast furnace in winter according to claim 1, characterized in that: When the blast furnace is being built, a thermometer is installed in the gap of the cooling wall inside the blast furnace.
4. The construction method for refractory masonry insulation of blast furnace in winter according to claim 1, characterized in that: The outside air temperature, the temperature at the work place and around the lining, the temperature in the preheating shed where the heating materials are located, and the temperature of the amorphous refractory materials during mixing, use and curing are measured every 4 hours.
5. The construction method for refractory masonry insulation of blast furnace in winter according to claim 4, characterized in that: When measuring the temperature of amorphous refractory materials, the temperature gauge should be placed in the material for no less than 3 minutes.