Blast furnace concrete foundation cooling device

Abstract

The invention provides a blast furnace concrete foundation cooling device which comprises a high-level water tank used for storing cooling water and supplying first cooling water; a cooling water tank for storing cooling water and for supplying second cooling water, the second cooling water being lower in temperature than the first cooling water; the cooling coil pipe is pre-buried in the blast furnace concrete, and is communicated with the high-level water tank and the cooling water tank to form a circulating cooling flow path; according to the cooling system, the high-level water tank can be used for preventing the situation that cooling water cannot run due to power failure, and cooling failure of the blast furnace foundation is caused, the temperature of the cooling water can be controlled and adjusted through the adjusting valve and the two paths of cooling water, and the cooling effect of cooling of the blast furnace foundation is guaranteed. The plastic coil pipe is used for replacing a steel pipe for cooling, the one-time investment is small, the construction difficulty is small, no connector exists in the middle, the construction speed is high, and the cooling effect is easy to control.

Description

Technical Field

[0001] The present invention belongs to the technical field of blast furnace facilities, and in particular, relates to a blast furnace concrete foundation cooling device. Background Art

[0002] In the construction process of iron-making blast furnace foundation, large-volume concrete pouring has always been the focus and difficulty of blast furnace foundation construction (generally, the concrete pouring volume of large and medium-sized blast furnace foundation is 2000m 3 Up to 4000m 3 ). The traditional blast furnace foundation design is a square base at the bottom and a circular pier foundation at the top. Generally, the vertical height from the bottom plate of the foundation to the top of the blast furnace foundation of large and medium-sized blast furnaces is generally between 7 and 10 meters. The concrete volume is large and the construction time is long. Concrete heat dissipation is a key and difficult point. In this context, it is necessary to further study and apply the cooling of blast furnace foundation concrete construction. Summary of the invention

[0003] This application summarizes the experience of previous blast furnace foundation concrete pouring construction, and adopts improved cooling process technology, adding high-level water tanks and flow regulating valves to control the flow to adjust the cooling speed and ensure that the cooling water system will not be unable to operate due to power outages. By using plastic PE coil cooling instead of traditional steel pipe cooling, plastic PE coil construction is convenient and fast, and there are no joints inside and outside the foundation, which has obvious advantages over traditional blast furnace foundation steel pipe cooling.

[0004] The present application provides a blast furnace concrete foundation cooling device, comprising:

[0005] A high-level water tank, used for storing cooling water and for supplying first cooling water;

[0006] A cooling water tank for storing cooling water and for supplying second cooling water, wherein the second cooling water has a lower temperature than the first cooling water;

[0007] The cooling coil is pre-buried in the blast furnace concrete and connected with the high-level water tank and the cooling water pool to form a circulating cooling flow path;

[0008] The temperature measuring point is arranged inside the concrete and is used to measure the internal temperature of the concrete in real time.

[0009] Optionally, the high-level water tank is higher than the circular base pier of the blast furnace foundation.

[0010] Optionally, the outlet of the high-level water tank is connected to a first cooling water inlet branch, which is connected to a cooling water inlet main pipe through a first one-way valve, the cooling water inlet main pipe is connected to the water inlet of the cooling coil, and the outlet of the cooling coil is connected to the cooling water outlet main pipe, the cooling water outlet main pipe branches out a first cooling water return branch connected to the water inlet of the high-level water tank,

[0011] The cooling water pool is connected to the cooling water inlet main pipe through the second cooling water inlet branch, on which a water pump and a second one-way valve are installed in sequence, and the cooling water outlet main pipe also branches out a second cooling water return branch connected to the water inlet of the cooling water pool.

[0012] Optionally, the high-level water tank also branches out a pipeline connected to the water inlet of the cooling water tank.

[0013] Optionally, the blast furnace concrete includes a square base and a circular base at the upper end thereof, and the cooling coil includes a first cooling coil and a second cooling coil that are interconnected, the first cooling coil is arranged in the square base, and the second cooling coil is arranged in the circular base.

[0014] Optionally, the water inlet of the first cooling coil is connected to the water outlet of the cooling water inlet main pipe, the water outlet of the first cooling coil is connected to the water inlet of the second cooling coil, and the water outlet of the second cooling coil is connected to the cooling water outlet main pipe.

[0015] Optionally, the first cooling coil is a whole plastic coil that is bent and extended in a zigzag manner in the square base.

[0016] Optionally, two layers of cooling coils are adopted in the circular pier, and one layer of cooling coils is arranged at an elevation of 2.0m and 4.0m respectively.

[0017] Optionally, the cooling coil is tied to the angle steel bracket.

[0018] Optionally, when the concrete pouring height exceeds the cooling coil position and is vibrated to make it dense, water cooling is carried out, and the cooling water pipe flow rate is controlled at 0.8-1.0m3 / h. When the temperature difference between the water temperature in the cooling water inlet main pipe and the cooling water outlet main pipe is greater than the first set threshold, or less than the second set threshold, or the difference between the water temperature in the cooling water inlet main pipe and the internal temperature of the concrete exceeds 20°C, the circulating cooling of the first cooling water in the high-level water tank is stopped, and the second cooling water in the cooling water pool is used for circulating cooling instead.

[0019] Compared with the prior art, this application has the following beneficial effects:

[0020] The present invention utilizes plastic coils instead of steel pipes for cooling, with small one-time investment, low construction difficulty, fast construction speed without joints in the middle, and good control of cooling effect.

[0021] The present application utilizes the first cooling water of the high-level water tank and the second cooling water of the cooling water pool to adjust the cooling cycle according to the concrete temperature, thereby ensuring that the cooling rate is controllable and that the cooling water system will not be unable to operate due to power outages, thereby ensuring the construction quality of the blast furnace foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of a blast furnace concrete foundation cooling device according to an embodiment of the present invention.

[0023] Figure 2 It is a schematic diagram of the first cooling coil described in an embodiment of the present invention.

[0024] Figure 3 It is a schematic diagram of the second cooling coil described in an embodiment of the present invention.

[0025] Figure 4 Schematic diagram of the arrangement of temperature measurement points of the square base according to an embodiment of the present invention.

[0026] Figure 5 Schematic diagram of the arrangement of temperature measuring points of the circular pier according to an embodiment of the present invention.

[0027] Reference numerals:

[0028] A high-level water tank 10, a cooling water pool 20, a cooling coil 40, a temperature measuring point 60, a first cooling water inlet branch 12, a first one-way valve 11, a cooling water inlet main pipe 30, a cooling water outlet main pipe 50, a first cooling water return branch 51, a second cooling water inlet branch 23, a water pump 22, a second one-way valve 21, a second cooling water return branch 52, a first cooling coil 41, and a second cooling coil 42. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed connection" means that the two are connected to each other and the relative position relationship after the connection remains unchanged. "Rotational connection" means that the two are connected to each other and can rotate relative to each other after the connection. The directional terms mentioned in the embodiments of the present application, such as "upper", "lower", "inner", "outer", etc., are only reference to the directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0031] The blast furnace concrete foundation cooling device of this embodiment includes a high-level water tank 10, which is arranged at a higher position and stores first cooling water; a cooling water pool 20, which contains second cooling water; and a cooling coil 40, which is pre-buried in the blast furnace concrete and communicates with the high-level water tank 10 and the cooling water pool 20. A temperature measuring point 60 is arranged inside the concrete and is used to measure the internal temperature of the concrete in real time.

[0032] The high-level water tank 10 may be higher than the circular base of the blast furnace foundation, for example Figure 1 In the embodiment, the height of the circular pier is 5.68m, and the height of the high-level water tank 10 can be 6m. The high-level water tank is set at a higher height, and the gravity flow of water can be used to transport cooling water to the cooling coil 40 without setting a water pump, and the cooling water system will not be unable to operate due to power outages.

[0033] The outlet of the high-level water tank 10 is connected to the first cooling water inlet branch 12, on which the first one-way valve 11 is installed, and is connected to the cooling water inlet main pipe 30 through the first one-way valve 11. Water can be supplied to the cooling water inlet main pipe 30 by opening the first one-way valve 11, and the cooling water inlet main pipe 30 is connected to the water inlet of the cooling coil 40. The outlet of the cooling coil 40 is connected to the cooling water outlet main pipe 50, and the cooling water outlet main pipe 50 branches out a first cooling water return branch 51 connected to the water inlet of the high-level water tank 10. In order to allow the cooling water to flow to the high-level water tank 10, a water pump can be installed on the first cooling water return branch 51.

[0034] The second cooling water temperature of the cooling water pool is lower than the first cooling water temperature because the cooling water pool has a larger heat dissipation area. The cooling water pool 20 is connected to the cooling water inlet main pipe 30 through the second cooling water inlet branch 23, and a water pump 22 and a second one-way valve 21 are installed on the second cooling water inlet branch 23 in sequence. The cooling water outlet main pipe 50 also branches out a second cooling water return branch 52 connected to the water inlet of the cooling water pool 20.

[0035] Furthermore, the high-level water tank 10 also branches out a pipeline connected to the water inlet of the cooling water tank 20 .

[0036] The cooling coil 40 can be a plastic PE coil, including a first cooling coil 41 and a second cooling coil 42 which are interconnected. The first cooling coil 41 is arranged in a square base, and the second cooling coil 42 is arranged in a circular base. The water inlet of the first cooling coil 41 is connected to the water outlet of the cooling water inlet main pipe 30, the water outlet of the first cooling coil 41 is connected to the water inlet of the second cooling coil 42, and the water outlet of the second cooling coil 42 is connected to the cooling water outlet main pipe 50.

[0037] In the temperature control construction of large-volume concrete, the temperature rise and fall of the concrete casting block, the temperature difference between the inside and outside, the cooling rate and the ambient temperature should be monitored during the curing process. Provide a scientific basis for timely and accurate temperature control measures during the construction process. The large-volume concrete construction of this project has a large area and thickness. The internal cement hydration heat is high and not easy to dissipate, which leads to a larger temperature difference between the inside and outside of the concrete, and the temperature stress also increases accordingly. If it is not controlled, it will inevitably cause cracking of the concrete. Therefore, through temperature measurement, the internal temperature of the large-volume concrete is understood, and according to the temperature measurement results, the insulation and moisture retention of the concrete are guided to reduce the temperature difference between the inside and outside of the concrete. This is of great significance to ensure the later quality of the concrete and control the cracks of the concrete.

[0038] Among them, the surface temperature of the concrete casting block shall be based on the temperature 50mm inside the concrete surface; the bottom temperature of the concrete casting block shall be based on the temperature 50mm above the bottom surface of the concrete; the middle temperature of the concrete casting block shall be based on the temperature at 1 / 2 of the concrete height; the ambient temperature shall be based on the temperature under the curing plastic film, arranged along the casting height;

[0039] Among them, all the temperature measuring points 60 are numbered to measure the temperature at different depths and surfaces inside the concrete. The temperature measuring points of the square base and the circular pier are distributed as follows: Figure 4 , Figure 5 shown.

[0040] Among them, the temperature measurement points and locations of the rectangular concrete and truncated concrete foundations of blast furnaces are detailed in the attached Figure 4 , 5 .

[0041] A steel group company 2*1580m 3 Take the blast furnace foundation as an example for process analysis. The blast furnace foundation has an irregular square base of 23*23 meters below it, and the circular base pier on the top is a truncated platform with a diameter of 13.16 meters. Figure 1 and Figure 2 The total height of one pouring reaches 9.48 meters. This embodiment improves the concrete foundation of the blast furnace by adopting a solution of burying cooling water pipes inside to scientifically cool the concrete.

[0042] The first cooling coil 41 of the square base adopts a whole plastic coil, which avoids the defect of welded steel pipes having joints inside the foundation, and the construction is quick and convenient. The whole plastic coil can also increase the heat exchange area by increasing the number of cooling water pipes to improve the construction quality and efficiency. The first cooling coil 41 of the square base is formed by bending a plastic pipe coil with a diameter of 40mm as a whole. The first cooling coil 41 is set at a position 1300mm below the casting surface of the square platform. The horizontal spacing of each pipeline of the first cooling coil 41 is 1500mm, and the turning radius is 750mm.

[0043] The second cooling coil 42 of the circular pier is composed of 25mm diameter plastic pipe coils that are integrally bent and connected. The cylindrical foundation is 5.68m thick and adopts two layers of cooling coils, one layer is arranged at an elevation of 2.0m and 4.0m respectively. The horizontal spacing of the water pipes of each pipeline of the second cooling coil 42 is 1500mm, and the turning radius is 750mm.

[0044] On site, a 2.0*3.0*1.5m high-level water tank 10 is made of 10mm thick steel plate, and various valves and water pumps are installed. The water pump uses a 40QW15-30-2.2 submersible sewage pump to ensure uninterrupted water supply and residual water recycling. After the design is completed, the cooling water pipe installation stage begins. Before the concrete is poured, the cooling coil 40 is pre-buried while the steel bars of the foundation are tied. When burying the cooling coil 40, pay attention to the following points:

[0045] (1) The interior of the cooling coil 40 should be kept unobstructed to prevent blockage;

[0046] (2) The quality of the cooling coil 40 joints should be strictly controlled, and water leakage is strictly prohibited to prevent cement slurry from entering the pipe during concrete pouring. Special attention should be paid to the elbow position;

[0047] (3) The cooling coil 40 can be tied to the angle steel bracket to prevent the water pipe from deforming or the pipe head from falling off during the concrete pouring process, thereby preventing water blockage or leakage.

[0048] 3.4 Temperature control and monitoring

[0049] When the concrete pouring height exceeds the cooling coil 40 position and is vibrated and compacted, water cooling can be carried out. The cooling water pipe flow rate is controlled at 0.8~1.0m 3 / h, the temperature difference of the water passing through the inlet and outlet should not be greater than 6°C. When the temperature of the concrete rises slowly, the water in the high-level water tank 10 can be used for circulating cooling; when it is found that the temperature difference between the water temperature in the cooling water inlet main pipe and the cooling water outlet main pipe is greater than the first set threshold, such as 15°C, or less than the second set threshold, such as 3°C, or the difference between the water temperature in the cooling water inlet main pipe and the internal temperature of the concrete exceeds 20°C, the water supply in the high-level water tank 10 is stopped, and the cold water source with lower temperature in the cooling water pool 20 is used for circulation, and the water flow speed is accelerated at the same time to ensure that the heat in the foundation is quickly discharged and prevent temperature cracks from occurring around the water pipe; the discharged water with higher temperature can be directly sprayed on the surface of the foundation to maintain the temperature of the surface of the foundation, so as to achieve the purpose of balancing the temperature difference between the inside and the outside and curing the concrete.

[0050] Among them, if the temperature difference is greater than the first set threshold, it means that the concrete temperature is high. Although the cooling water cools it, it needs to be cooled quickly because the concrete temperature is high. If the temperature difference is less than the second set threshold, it means that the cooling water has little effect on cooling the concrete and needs to be cooled quickly. If the difference between the water temperature of the cooling water inlet main and the internal temperature of the concrete exceeds 20°C, it also needs to be cooled quickly.

[0051] When the difference between the internal temperature and the surface temperature of the concrete is less than 20℃, and the atmospheric temperature and the concrete surface temperature are not greater than 20℃, the water cooling can be stopped. At this time, the cooling water pipes embedded in the cap should be grouting to prevent the water pipes from rusting in the later stage and affecting the overall quality of the cap. The strength grade of the pipeline grouting is not less than 42.5 grade low carbon silicate cement, the water-binder ratio of the cement slurry is not more than 0.3, and the volume shrinkage rate should be less than 1%. During the grouting construction process, the grouting amount and density of the cooling water pipe are strictly controlled to ensure that the grouting of the opposite end of the pipe body is continuous and full after grouting. Grouting can be stopped and plugged immediately after passing the test.

[0052] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and deformations according to the present invention, but these corresponding changes and deformations shall fall within the protection scope of the claims of the present invention.

Claims

1. A blast furnace concrete foundation cooling device, characterized in that: include: A high-level water tank, used for storing cooling water and for supplying first cooling water; A cooling water tank for storing cooling water and for supplying second cooling water, wherein the second cooling water has a lower temperature than the first cooling water; The cooling coil is pre-buried in the blast furnace concrete and connected with the high-level water tank and the cooling water pool to form a circulating cooling flow path; The temperature measuring point is arranged inside the concrete and is used to measure the internal temperature of the concrete in real time.

2. The blast furnace concrete foundation cooling device according to claim 1, characterized in that: The high-level water tank is higher than the circular base pier of the blast furnace foundation.

3. The blast furnace concrete foundation cooling device according to claim 2, characterized in that: The outlet of the high-level water tank is connected to a first cooling water inlet branch, which is connected to a cooling water inlet main pipe through a first one-way valve. The cooling water inlet main pipe is connected to the water inlet of the cooling coil, and the outlet of the cooling coil is connected to the cooling water outlet main pipe. The cooling water outlet main pipe branches out a first cooling water return branch connected to the water inlet of the high-level water tank. The cooling water pool is connected to the cooling water inlet main pipe through the second cooling water inlet branch, on which a water pump and a second one-way valve are installed in sequence, and the cooling water outlet main pipe also branches out a second cooling water return branch connected to the water inlet of the cooling water pool.

4. The blast furnace concrete foundation cooling device according to claim 3, characterized in that: The high-level water tank also branches out a pipeline connected to the water inlet of the cooling water pool.

5. The blast furnace concrete foundation cooling device according to claim 1, characterized in that: The blast furnace concrete comprises a square base and a circular base pier at the upper end thereof, and the cooling coil comprises a first cooling coil and a second cooling coil which are interconnected, wherein the first cooling coil is arranged in the square base, and the second cooling coil is arranged in the circular base pier.

6. The blast furnace concrete foundation cooling device according to claim 5, characterized in that: The water inlet of the first cooling coil is connected to the water outlet of the cooling water inlet main pipe, the water outlet of the first cooling coil is connected to the water inlet of the second cooling coil, and the water outlet of the second cooling coil is connected to the cooling water outlet main pipe.

7. The blast furnace concrete foundation cooling device according to claim 5, characterized in that: The first cooling coil adopts a whole plastic coil and extends in a zigzag manner in a square base.

8. The blast furnace concrete foundation cooling device according to claim 5, characterized in that: Two layers of cooling coils are adopted in the circular pier, and one layer of cooling coils is arranged at the elevation of 2.0m and 4.0m respectively.

9. The blast furnace concrete foundation cooling device according to claim 1, characterized in that: The cooling coil is tied to the angle steel bracket.

10. The blast furnace concrete foundation cooling device according to claim 3, characterized in that: When the concrete pouring height exceeds the cooling coil position and is vibrated and compacted, water cooling is carried out. The cooling water pipe flow is controlled at 0.8-1.0m3 / h. When the temperature difference between the water temperature in the cooling water inlet main pipe and the cooling water outlet main pipe is greater than the first set threshold, or less than the second set threshold, or the difference between the water temperature in the cooling water inlet main pipe and the internal temperature of the concrete exceeds 20°C, the circulating cooling of the first cooling water in the high-level water tank is stopped and replaced by the second cooling water in the cooling water pool for circulating cooling.

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