Blast furnace hot blast stove cooling water system based on soft water closed circulation

Abstract

This utility model discloses a blast furnace hot blast stove cooling water system based on a closed-loop soft water circulation system, including a blast furnace cooling module and a hot blast stove cooling module. The blast furnace cooling module, from the cooling wall outlet to the inlet of the blast furnace body, sequentially includes a main water collection pipe, a degassing tank, an expansion tank, an air cooler, a soft water pump, and a main measuring component. The hot blast stove cooling module, along the soft water flow direction, sequentially includes a main inlet valve, an automatic interlocking pump assembly, a primary measuring component, a cooling submodule, another primary measuring component, and a main outlet valve. The main inlet valve connects the main measuring component and the cooling wall inlet of the blast furnace body, and the main outlet valve is connected to the outlet end of the main water collection pipe via a return water pipe. The cooling submodule includes multiple cooling units connected in parallel. This system effectively improves the water quality of the hot blast stove cooling water, reduces scaling and corrosion rates, and avoids the impact of equipment replacement on production.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace ironmaking technology, and in particular to a blast furnace hot blast stove cooling water system based on soft water closed-loop circulation. Background Technology

[0002] The blast furnace hot blast stove is one of the main auxiliary equipment of the blast furnace in an ironmaking plant, and typically one blast furnace is equipped with 3 to 4 hot blast stoves. The main function of the hot blast stove is to continuously provide the blast furnace with high-temperature hot air exceeding 1000 degrees Celsius to promote the chemical reactions during the ironmaking process. As one of the core pieces of equipment in the blast furnace ironmaking process, the stable and efficient operation of the blast furnace hot blast stove directly affects the safe production, energy utilization efficiency, and pig iron yield and quality of the blast furnace. Currently, the cooling system of the blast furnace hot blast stove generally adopts an open-loop circulation cooling method using industrial water.

[0003] The open-loop cooling system for industrial water involves pumping pressurized industrial water from a cold water tank to a hot blast stove for heat absorption and heating. The water then flows into a cooling tower for evaporation and heat dissipation, before cooling back to the cold water tank, forming an open loop. Throughout this loop, the water is in contact with the atmosphere. However, industrial water typically has high hardness, containing large amounts of calcium and magnesium ions, as well as suspended solids and colloids, which can corrode cooling equipment. During the cooling water circulation process, as the water temperature rises and evaporates, these impurities easily precipitate and deposit on the inner walls of pipes, valves, pumps, and other critical components, forming hard scale. Scale has extremely low thermal conductivity, severely hindering heat transfer and reducing cooling efficiency. The open-loop circulation, with direct contact with the atmosphere and continuous oxygen supply, further exacerbates oxygen corrosion. Combined with under-scale corrosion, this ultimately leads to frequent perforations, cracks, and leaks in cooling water pipes, valves, and flange connections, easily causing leaks in the hot blast stove. This not only affects the continuity of hot blast stove production but also the safe operation of the blast furnace. Utility Model Content

[0004] Therefore, it is necessary to provide a blast furnace hot blast stove cooling water system based on soft water closed circulation to address the above-mentioned technical problems. This system can effectively improve the water quality of the hot blast stove cooling water, reduce scaling and corrosion rates, and avoid the impact of equipment replacement on production.

[0005] This utility model provides a blast furnace hot blast stove cooling water system based on soft water closed circulation, including a blast furnace cooling module and a hot blast stove cooling module.

[0006] The blast furnace cooling module is used to cool the blast furnace body. From the water outlet of the cooling wall of the blast furnace body to the water inlet, it includes a connected main water collection pipe, a degassing tank, an expansion tank, an air cooler, a soft water pump, and a main measuring component.

[0007] The hot air furnace cooling module is used to cool the hot air furnace. Along the soft water flow direction, it includes, in sequence, a connected main inlet valve, an automatic interlocking water pump assembly, a primary measurement assembly, a cooling sub-module, a primary measurement assembly, and a main outlet valve.

[0008] The main inlet valve is connected between the main measuring component and the cooling wall inlet of the blast furnace body, and the main outlet valve is connected to the outlet end of the main water collection pipe through the return water pipe.

[0009] The cooling submodule includes multiple cooling units connected in parallel. Each cooling unit includes a secondary measurement component, a cooling valve, and a secondary measurement component in sequence along the soft water flow direction.

[0010] In one embodiment, the automatic interlocking pump assembly includes three pressurized water pumps that are interlocked with each other.

[0011] In one embodiment, the blast furnace cooling module further includes a soft water supply pump connected between the soft water pump and the air cooler.

[0012] In one embodiment, the total measurement component, the primary measurement component, and the secondary measurement component all include a flow meter, a pressure gauge, and a thermometer.

[0013] In one embodiment, the return pipe of the main outlet valve and the main water collection pipe have an included angle α, where 10°≤α≤45°.

[0014] In one embodiment, both the inlet main valve and the outlet main valve are gate valves.

[0015] In one embodiment, the cooling valve is a hot air valve or a backflow valve.

[0016] The beneficial effects of this utility model are:

[0017] (1) In this utility model, the hot blast stove cooling module and the blast furnace cooling module are combined into one to achieve common soft water closed-loop cooling. The use of soft water cooling can reduce the scaling rate and corrosion rate of pipes and cooling valves. The closed-loop circulation can improve the water recycling rate, reduce cooling costs, and further reduce the corrosion rate.

[0018] (2) The soft water circulation of hot blast stove and soft water circulation of blast furnace are combined into one, with some pipelines and equipment overlapping, which further improves the utilization rate of soft water and reduces cooling costs.

[0019] (3) The use of an automatic interlocking water pump assembly to pressurize the soft water in the hot blast furnace soft water circulation can ensure the safe operation of the hot blast furnace cooling system. Attached Figure Description

[0020] Figure 1A schematic diagram of the structure of a blast furnace hot blast stove cooling water system based on a closed-loop soft water circulation provided in an embodiment of this utility model.

[0021] Explanation of reference numerals in the attached drawings: 100, Blast furnace body; 200, Main water collection pipe; 300, Degassing tank; 400, Expansion tank; 500, Air cooler; 600, Soft water pump; 700, Main measuring component; 800, Soft water makeup pump; 900, Main inlet valve; 910, Automatic interlocking pump assembly; 920, Primary measuring component; 930, Cooling submodule; 931, Secondary measuring component; 932, Cooling valve; 940, Main outlet valve. Detailed Implementation

[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0023] It should be noted that in the description of this utility model, "upper," "lower," "top," "bottom," and orientation or positional relationship are based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] In one embodiment, such as Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of a blast furnace hot blast stove cooling water system based on a closed-loop soft water circulation system provided in this embodiment of the present invention. The blast furnace hot blast stove cooling water system based on a closed-loop soft water circulation system in this embodiment includes a blast furnace cooling module and a hot blast stove cooling module;

[0025] The blast furnace cooling module is used to cool the blast furnace body 100. From the water outlet of the cooling wall of the blast furnace body 100 to the water inlet, it includes a connected main water collection pipe 200, a degassing tank 300, an expansion tank 400, an air cooler 500, a soft water pump 600, and a main measuring component 700.

[0026] The hot blast stove cooling module, used to cool the hot blast stove, includes, in sequence along the soft water flow direction, a main inlet valve 900, an automatic interlocking water pump assembly 910, a primary measuring assembly 920, a cooling submodule 930, a primary measuring assembly 920, and a main outlet valve 940. The main inlet valve 900 is connected between the main measuring assembly 700 and the cooling wall inlet of the blast furnace body 100, and the main outlet valve 940 is connected to the outlet end of the main water collection pipe 200 via a return water pipe.

[0027] In this embodiment, the degassing tank 300 is used to remove gas from the circulation pipeline, the expansion tank 400 is used to stabilize the pressure of the circulation pipeline, and the air cooler 500 is used to cool the liquid in the circulation pipeline. The soft water pump 600 is used to pressurize the soft water in the pipeline.

[0028] Both the inlet main valve 900 and the outlet main valve 940 are gate valves, which offer good stability. The automatic interlocking water pump assembly 910 includes three booster pumps, which are interlocked with each other. The interlocking device ensures the safe use of water for the hot blast furnace by having two booster pumps in operation and one as a backup.

[0029] Specifically, in this embodiment, both the blast furnace cooling module and the hot blast stove cooling module are closed-loop soft water circulation systems, and the two circulations share a degassing tank 300, an expansion tank 400, an air cooler 500, a soft water pump 600, and a soft water makeup pump 800. This reduces costs while improving the utilization rate of soft water.

[0030] The cooling submodule 930 includes multiple cooling units connected in parallel. Each cooling unit includes, in sequence along the soft water flow direction, a secondary measurement component 931, a cooling valve 932, and another secondary measurement component 931. The cooling valve 932 is either a hot air valve or a backflow valve.

[0031] In this embodiment, a closed-loop soft water circulation system is used to cool the hot blast furnace instead of an open-loop industrial water system. This reduces the scaling and corrosion rates of valves and other components, extending their service life. Changing from an open-loop to a closed-loop system improves water recycling efficiency, leading to cost reduction and efficiency gains.

[0032] In one embodiment, the blast furnace cooling module further includes a soft water makeup pump 800, which is connected between the soft water pump 600 and the air cooler 500. When soft water is lost in the entire system pipeline, the soft water makeup pump 800 can be used to replenish the soft water in the pipeline, reduce or remove gas in the pipeline, and reduce the corrosion rate.

[0033] In one embodiment, the total measuring component 700, the primary measuring component 920, and the secondary measuring component 931 all include flow meters, pressure gauges, and thermometers. These measuring components enable monitoring of the valve operating status in each cooling unit, as well as the operating status of the blast furnace cooling module and the hot blast stove cooling module, thus ensuring the normal operation of the entire system. The operating status includes, but is not limited to, whether the cooling intensity meets requirements and whether there is water leakage.

[0034] In one embodiment, the return water pipe of the main outlet valve 940 and the main water collection pipe 200 have an included angle α, where 10°≤α≤45°. The included angle between the return water pipe of the main outlet valve 940 and the main water collection pipe 200 is less than 45°, which can prevent the return water from the main outlet valve 940 from impacting the water flow in the main water collection pipe 200 and thus affecting the cooling intensity of the blast furnace cooling module.

[0035] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A blast furnace hot blast stove cooling water system based on a closed-loop soft water circulation system, characterized in that, Includes blast furnace cooling modules and hot blast stove cooling modules; The blast furnace cooling module is used to cool the blast furnace body (100). From the water outlet of the cooling wall of the blast furnace body (100) to the water inlet, it includes a connected main water collection pipe (200), a degassing tank (300), an expansion tank (400), an air cooler (500), a soft water pump (600), and a main measuring component (700). The hot air furnace cooling module is used to cool the hot air furnace and includes, in sequence along the soft water flow direction, a main inlet valve (900), an automatic interlocking water pump assembly (910), a primary measuring assembly (920), a cooling sub-module (930), a primary measuring assembly (920), and a main outlet valve (940). The main inlet valve (900) is connected between the main measuring component (700) and the cooling wall water inlet of the blast furnace body (100), and the main outlet valve (940) is connected to the outlet end of the main water collection pipe (200) through the return water pipe; The cooling submodule (930) includes multiple cooling units connected in parallel. Each cooling unit includes a secondary measuring component (931), a cooling valve (932), and a secondary measuring component (931) in sequence along the soft water flow direction.

2. The blast furnace hot blast stove cooling water system based on soft water closed-loop circulation according to claim 1, characterized in that, The automatic interlocking water pump assembly (910) includes three pressurized water pumps, which are interlocked with each other.

3. The blast furnace hot blast stove cooling water system based on soft water closed-loop circulation according to claim 2, characterized in that, The blast furnace cooling module also includes a soft water supply pump (800), which is connected between the soft water pump (600) and the air cooler (500).

4. The blast furnace hot blast stove cooling water system based on soft water closed-loop circulation according to claim 3, characterized in that, The total measurement assembly (700), the primary measurement assembly (920), and the secondary measurement assembly (931) all include a flow meter, a pressure gauge, and a thermometer.

5. The blast furnace hot blast stove cooling water system based on soft water closed-loop circulation according to claim 1, characterized in that, The return water pipe of the main outlet valve (940) and the main water collection pipe (200) have an included angle α, where 10°≤α≤45°.

6. The blast furnace hot blast stove cooling water system based on soft water closed-loop circulation according to claim 1, characterized in that, Both the main inlet valve (900) and the main outlet valve (940) are gate valves.

7. The blast furnace hot blast stove cooling water system based on soft water closed-loop circulation according to claim 6, characterized in that, The cooling valve (932) is a hot air valve or a backflow valve.

Images