Method for enhancing cooling strength of system in later period of furnace service of blast furnace

Abstract

The invention discloses a method for enhancing system cooling strength in the later period of furnace service of a blast furnace, the system cooling strength is enhanced by using a cooling device, the cooling device comprises an evaporative air cooler, the evaporative air cooler comprises a spraying water tank, and a cooling tower A is mounted above the spraying water tank; a cooling tower water inlet pipe is arranged between a water inlet of the cooling tower A and the spraying water tank, a self-priming pump is mounted on the cooling tower water inlet pipe, and a first cooling tower water outlet pipe is arranged between a first water outlet of the cooling tower A and the spraying water tank. The cooling tower A is additionally arranged on the basis of an original evaporative air cooler, the temperature of spraying water can be further reduced, the spraying cooling effect is enhanced, the cooling strength of a water softening system is improved, and then the requirement for temperature control of soft water in summer is met. On the basis of meeting the temperature requirement of a soft water system in summer in the later period of furnace service of the blast furnace, the circulation ratio of the system is improved, waste of a large amount of desalted water and production fire-fighting water resources is avoided, and consumption of chemicals is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of blast furnace cooling equipment, in particular to a method for strengthening the cooling strength of a blast furnace system in the later stage of its service life. Background Art

[0002] At present, the soft water cooling of blast furnaces relies on air coolers as carriers, and uses the refrigerant supplied by spray water pumps to cool the soft water. The contact heat transfer between spray water and air and the evaporation heat absorption are used to reduce the temperature. After the soft water is cooled, it enters the ring pipe again for users to use. The spray water flows into the spray water pool through the water receiving tray and pipes through the air cooler soft water port. The spray water pool is a closed water pool and is lifted to the evaporative air cooler to cool the soft water again through the spray water pump. The demand for cooling intensity of blast furnaces in the later stage of furnace service increases. The current commonly used practice is to replace desalted water with the soft water system and to replace the production fire water with the spray water system to reduce the temperature of the soft water as much as possible to meet the production needs of the blast furnace in the later stage.

[0003] In the later period of blast furnace service, the cooling intensity is required to be strengthened due to the falling of furnace wall and other reasons. Under the current condition that the soft water flow rate remains unchanged, the supply and return water temperature difference of the blast furnace soft water system in summer is large, and the spray water temperature after passing through the air cooler is still high, up to 38.5℃. When the soft water is sent out again through the spray water pump to cool the soft water, the soft water temperature is high and cannot meet the production and use requirements. Reducing the temperature of soft water by replacing desalted water with the soft water system and replacing production fire water with the spray water system will cause a large amount of desalted water and production fire water to be wasted. The circulation rate of the system is high, and the dosage of the reagent needs to be increased. Summary of the invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a method for strengthening the cooling strength of a blast furnace system in the later stage of its operation.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a method for strengthening the cooling strength of a system in the later stage of a blast furnace service, using a cooling device to strengthen the cooling strength of the system, the cooling device comprising an evaporative air cooler, the evaporative air cooler comprising a spray water pool, a cooling tower A is installed above the spray water pool, a cooling tower water inlet pipe is arranged between the water inlet of the cooling tower A and the spray water pool, a self-priming pump is installed on the cooling tower water inlet pipe, and a first cooling tower water outlet pipe is arranged between the first water outlet of the cooling tower A and the spray water pool; the method comprises the following steps: when the temperature of blast furnace soft water exceeds a set temperature, turning on the self-priming pump above the spray water pool, lifting the water in the spray water pool to the cooling tower A for cooling, and the cooled water flows back to the spray water pool through the first cooling tower water outlet pipe.

[0006] As a further improvement of the present invention: the first cooling tower water outlet pipe is provided with a first electric regulating valve.

[0007] As a further improvement of the present invention: the spray pond is provided with a first liquid level sensor, and the first liquid level sensor is electrically connected to the first electric control valve.

[0008] As a further improvement of the present invention: the cooling device further includes a clean circulating water pond, and a second cooling tower outlet pipe is provided between the clean circulating water pond and the second outlet of the cooling tower A.

[0009] As a further improvement of the present invention: the second cooling tower outlet pipe is provided with a second electric control valve; the clean circulating water pond is provided with a second liquid level sensor, and the second liquid level sensor is electrically connected to the second electric control valve.

[0010] As a further improvement of the present invention: the cooling device further includes a controller, and the first liquid level sensor, the second liquid level sensor, the first electric control valve and the second electric control valve are respectively electrically connected to the controller.

[0011] As a further improvement of the present invention: the cooling tower A is provided with two water inlets, and the cooling tower A is connected to the spray pond through two cooling tower inlet pipes, the two cooling tower inlet pipes are respectively connected to the two water inlets of the cooling tower A, and self-priming pumps are installed on both cooling tower inlet pipes.

[0012] As a further improvement of the present invention: one end of the evaporative air cooler is connected to the blast furnace water supply pipe, the other end of the evaporative air cooler is connected to the blast furnace return water pipe, the blast furnace water supply pipe is connected to the water inlet of the blast furnace, and the blast furnace return water pipe is connected to the water outlet of the blast furnace.

[0013] As a further improvement of the present invention: a cooling tower B is provided on the top of the clean circulating water pond, the water inlet of the cooling tower B is connected to the spray pond through a pipeline, the water outlet of the cooling tower B is connected to the spray main pipe of the evaporative air cooler through a second spray pipeline, and a second spray water pump is provided on the second spray pipeline.

[0014] As a further improvement of the present invention: the evaporative air cooler includes a housing and a plurality of air cooler units provided in the housing, the first spray water pump of the evaporative air cooler is respectively connected to the plurality of air cooler units through a spray main pipe, an electric butterfly valve is provided on the spray main pipe, and the electric butterfly valve divides the plurality of air cooler units into two groups, the first group of air cooler units is connected to the first spray water pump, and the second group of air cooler units is connected to the second spray water pump.

[0015] As a further improvement of the present invention: the method further includes when the temperature of the soft water in the blast furnace exceeds the set temperature, turning on the self-priming pump above the spray pond, lifting the spray water to the cooling tower A for cooling, and automatically controlling the first electric control valve and the second electric control valve through the first liquid level sensor of the spray pond and the second liquid level sensor of the clean circulating water pond, so as to automatically adjust the water volume entering the spray pond and the clean circulating water pond respectively from the cooling tower A; at the same time, turning on the second spray water pump and closing the electric butterfly valve between the first air-cooled unit and the second air-cooled unit, the original first spray water pump supplies water for cooling the first air-cooled unit, and the clean circulating water pond supplies water for cooling the second air-cooled unit through the second spray water pump.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] By adding the cooling tower A on the basis of the original evaporative air cooler, the present invention can further reduce the temperature of the spray water, strengthen the spray cooling effect, improve the cooling intensity of the soft water system, and further meet the requirements of the soft water temperature control in summer. On the basis of meeting the temperature requirements of the soft water system in summer during the later stage of the blast furnace campaign, the present invention improves the circulation ratio of the system, avoids waste of a large amount of desalted water and production and fire fighting water resources, and reduces the consumption of chemicals. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the present invention.

[0019] Figure 2 It is a schematic structural diagram of another angle of the present invention.

[0020] Figure 3 It is a cross-sectional view of the spray pond and the cooling tower A of the present invention.

[0021] Figure 4 It is a cross-sectional view of another angle of the spray pond and the cooling tower A of the present invention.

[0022] Reference numerals: 1, spray pond; 2, cooling tower A; 3, self-priming pump; 4, air-cooled unit; 5, second spray water pump; 6, cooling tower inlet pipe; 7, first electric control valve; 8, second electric control valve; 9, cooling tower B. DETAILED DESCRIPTION OF THE INVENTION

[0023] In this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the related terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0024] Please refer to Figures 1-4 , a method for strengthening the cooling intensity of a blast furnace system in the later stage of the furnace campaign, which uses a cooling device to strengthen the cooling intensity of the system. The cooling device includes an evaporative air cooler, and the evaporative air cooler includes a spray pond 1. Above the spray pond 1, a cooling tower A2 is installed. Between the water inlet of the cooling tower A2 and the spray pond 1, a cooling tower inlet pipe 6 is provided. A self-priming pump 3 is installed on the cooling tower inlet pipe 6. Between the first water outlet of the cooling tower A2 and the spray pond 1, a first cooling tower outlet pipe is provided. The cooling tower A2 is a water receiving tray type cooling tower; the method includes when the soft water temperature of the blast furnace exceeds the set temperature, turning on the self-priming pump above the spray pond to lift the water in the spray pond to the cooling tower A for cooling, and the cooled water flows back to the spray pond through the first cooling tower outlet pipe.

[0025] The present invention further reduces the temperature of the spray water by adopting a cooling tower, strengthens the spray cooling effect, so as to improve the cooling intensity of the soft water system, and further meets the requirements of soft water temperature control in summer.

[0026] On the basis of meeting the temperature requirements of the soft water system in summer in the later stage of the blast furnace campaign, the present invention improves the circulation ratio of the system, avoids wasting a large amount of demineralized water and production and fire fighting water resources, and reduces the consumption of chemicals.

[0027] Further, a first electric control valve 7 is provided on the first cooling tower outlet pipe.

[0028] Further, the spray pond 1 is provided with a first liquid level sensor, and the first liquid level sensor is electrically connected to the first electric control valve 7.

[0029] Further, the cooling device further includes a clean circulating water tank, and a second cooling tower outlet pipe is provided between the second water outlet of the cooling tower A2 and the clean circulating water tank.

[0030] Further, a second electric control valve 8 is provided on the second cooling tower outlet pipe.

[0031] Further, a second liquid level sensor is provided in the clean circulating water tank, and the second liquid level sensor is electrically connected to the second electric control valve 8.

[0032] Further, the cooling device further includes a controller, and the first liquid level sensor, the second liquid level sensor, the first electric control valve 7 and the second electric control valve 8 are respectively electrically connected to the controller.

[0033] Further, the cooling tower A2 is provided with two water inlets. The cooling tower A2 is connected to the spray pond 1 through two cooling tower inlet pipes 6. The two cooling tower inlet pipes 6 are respectively connected to the two water inlets of the cooling tower A2, and self-priming pumps 3 are installed on both of the two cooling tower inlet pipes 6.

[0034] Further, one end of the evaporative air cooler is connected to the blast furnace water supply pipe, the other end of the evaporative air cooler is connected to the blast furnace water return pipe, the blast furnace water supply pipe is connected to the water inlet of the blast furnace, and the blast furnace water return pipe is connected to the water outlet of the blast furnace.

[0035] Further, a cooling tower B9 is provided at the top of the clean circulating water tank. The water inlet of the cooling tower B9 is connected to the spray pond 1 through a pipeline. The water outlet of the cooling tower B9 is connected to the spray main pipe of the evaporative air cooler through a second spray pipeline, and a second spray water pump 5 is provided on the second spray pipeline.

[0036] Further, the evaporative air cooler includes a housing and a plurality of air cooler units 4 provided in the housing. The first spray water pump of the evaporative air cooler is respectively connected to the plurality of air cooler units through a spray main pipe. An electric butterfly valve is provided on the spray main pipe. The electric butterfly valve divides the plurality of air cooler units into two groups. The first group of air cooler units is connected to the first spray water pump, and the second group of air cooler units is connected to the second spray water pump 5. The first cooling tower outlet pipe is connected to the first spray water pump.

[0037] The method further includes when the temperature of the blast furnace soft water exceeds the set temperature, turning on the self-priming pump above the spray pond to lift the spray water to the cooling tower A for cooling, and automatically controlling the first electric control valve and the second electric control valve through the first liquid level sensor of the spray pond and the second liquid level sensor of the clean circulating water tank, so as to automatically adjust the water volume respectively entering the spray pond and the clean circulating water tank from the cooling tower A; at the same time, turning on the second spray water pump and closing the electric butterfly valve between the first group of air cooler units and the second group of air cooler units. The original first spray water pump supplies water for cooling use of the first group of air cooler units, and the clean circulating water tank supplies water for cooling use of the second group of air cooler units through the second spray water pump.

[0038] In a specific embodiment, the method includes that when the temperature of the soft water in the blast furnace exceeds 35°C, the self-priming pump above the spray pond is turned on to lift the spray water to cooling tower A for further cooling. At the same time, through the first liquid level sensor of the spray pond and the second liquid level sensor of the clean circulating water pond, the first electric control valve and the second electric control valve are automatically controlled, so as to automatically adjust the water volume of cooling tower A entering the spray pond and the clean circulating water pond respectively, realizing the dynamic balance of the liquid level; at the same time, the newly added second spray water pump is turned on, and the electric butterfly valve between the first group of air-cooled units and the second group of air-cooled units is closed. Then the original first spray water pump is used for the first group of air-cooled units, and the newly added second spray water pump is used for cooling the second group of air-cooled units, improving the cooling effect.

[0039] The present invention can meet the heat dissipation requirements of the blast furnace body at the end of the furnace campaign to the greatest extent, providing guarantee for the stable operation of the blast furnace at the end of the furnace campaign.

[0040] The present invention flexibly combines the water film type evaporative air cooler with cooling tower A2, which can greatly improve the cooling capacity of the system and make up for the problem that the evaporative air cooler itself has limited cooling capacity for the refrigerant medium itself.

[0041] The present invention can improve the circulation ratio of the system and reduce the consumption of water resources and chemicals.

[0042] The present invention adopts the combination of cooling tower A2 and the pond, which can save land occupation.

[0043] The operation mode of the present invention is flexible. During production operation, the evaporative air cooler is used for cooling. When the furnace condition is abnormal and at the end of the furnace campaign, the combined operation mode of the evaporative air cooler and cooling tower A2 is adopted to maximize the cooling capacity.

[0044] The working principle of the present invention:

[0045] To further reduce the temperature of the soft water at the end of the blast furnace campaign, the present invention is realized by adopting the method of strengthening the spray water intensity, specifically:

[0046] Two self-priming pumps are added by opening holes in the top plate of the closed spray pond, and a cooling tower A is added above the spray pond. The water in the spray pond is pumped to cooling tower A by the two self-priming pumps for further cooling;

[0047] The cooling tower outlet pipes of cooling tower A are respectively connected to the spray pond and the clean circulating water pond. A first electric control valve and a second electric control valve are respectively arranged on the two cooling tower outlet pipes. The valves of the two electric control valves are interlocked with the liquid level signals of the liquid level sensors of the spray pond and the clean circulating water pond; on this basis, part of the outlet water of the air cooler spray water is led to cooling tower B of the adjacent clean circulating water system for further cooling. At the same time, by using the abandoned top furnace water pump inlet pipe and foundation of the clean circulating water pond adjacent to the spray pond, a new second spray water pump is added to increase the spray water volume. The newly added second spray pipe is connected to the spray main pipe of the 8th to 10th evaporative air coolers, and an electric butterfly valve is added to the spray main pipe between the 1st to 7th and the 8th to 10th evaporative air coolers.

[0048] When the temperature of the blast furnace soft water exceeds 35 °C, turn on the self-priming pump above the spray pond to lift the spray water to cooling tower A for further cooling. At the same time, the electric control valves for cooling tower A to enter the two ponds are automatically adjusted through the liquid levels of the spray pond and the clean circulating water pond to achieve the dynamic balance of the system liquid level; at the same time, turn on the newly added second spray water pump and close the electric butterfly valve between the 1st to 7th and the 8th to 10th evaporative air coolers. Then the original first spray water pump is used for the 1st to 7th air coolers, and the newly added second spray water pump is used for cooling the 8th to 10th air coolers to improve the cooling effect.

[0049] The main functions of the present invention:

[0050] By adding cooling tower A on the basis of the original evaporative air cooler, the present invention can further reduce the temperature of the spray water, strengthen the spray cooling effect, improve the cooling intensity of the soft water system, and thus meet the requirements of the soft water temperature control in summer. On the basis of meeting the temperature requirements of the soft water system in summer during the later stage of the blast furnace campaign, the present invention improves the circulation ratio of the system, avoids wasting a large amount of desalted water and production and fire fighting water resources, and reduces the consumption of chemicals.

[0051] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper end face", "lower end face", "top", "bottom", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention. Therefore, it cannot be understood as a limitation on the actual use direction of the present invention.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention.

Claims

1. A method for enhancing the cooling intensity of a blast furnace during the late stage of its campaign, characterized in that: Enhance the system cooling intensity by using a cooling device. The cooling device includes an evaporative air cooler, and the evaporative air cooler includes a spray pond. Above the spray pond, a cooling tower A is installed. Between the water inlet of the cooling tower A and the spray pond, there is a cooling tower inlet pipe, and a self-priming pump is installed on the cooling tower inlet pipe. Between the first water outlet of the cooling tower A and the spray pond, there is a first cooling tower outlet pipe. The method includes that when the temperature of the blast furnace soft water exceeds the set temperature, turn on the self-priming pump above the spray pond to lift the water in the spray pond to the cooling tower A for cooling, and the cooled water flows back to the spray pond through the first cooling tower outlet pipe.

2. A method for enhancing the cooling intensity of a blast furnace in the later stage of its campaign, characterized in that: A first electric control valve is provided on the first cooling tower outlet pipe.

3. A method for enhancing the cooling intensity of a blast furnace during the late stage of its campaign, characterized in that: The spray pond is provided with a first liquid level sensor, and the first liquid level sensor is electrically connected to the first electric control valve.

4. A method for enhancing the cooling intensity of a blast furnace in the later stage of its campaign, characterized in that: The cooling device further includes a clean circulating water pond. Between the second water outlet of the cooling tower A and the clean circulating water pond, there is a second cooling tower outlet pipe.

5. A method for enhancing the cooling intensity of a blast furnace in the later stage of its campaign, characterized in that: A second electric control valve is provided on the second cooling tower outlet pipe; the clean circulating water pond is provided with a second liquid level sensor, and the second liquid level sensor is electrically connected to the second electric control valve.

6. A method for enhancing the cooling intensity of a blast furnace in the later stage of its campaign, characterized in that: The cooling tower A is provided with two water inlets. The cooling tower A is connected to the spray pond through two cooling tower inlet pipes, and the two cooling tower inlet pipes are respectively connected to the two water inlets of the cooling tower A. Self-priming pumps are installed on both cooling tower inlet pipes.

7. A method for enhancing the cooling intensity of a blast furnace in the later stage of its campaign, characterized in that: One end of the evaporative air cooler is connected to the blast furnace water supply pipe, and the other end is connected to the blast furnace water return pipe. The blast furnace water supply pipe is connected to the water inlet of the blast furnace, and the blast furnace water return pipe is connected to the water outlet of the blast furnace.

8. A method for enhancing the cooling intensity of a blast furnace in the later stage of its campaign, characterized in that: Above the clean circulating water pond, there is a cooling tower B. The water inlet of the cooling tower B is connected to the spray pond through a pipeline, and the water outlet of the cooling tower B is connected to the spray main pipe of the evaporative air cooler through a second spray pipeline. A second spray water pump is provided on the second spray pipeline.

9. A method for enhancing the cooling intensity of a blast furnace in the later stage of its campaign, characterized in that: The evaporative air cooler includes a shell and a plurality of air cooler units arranged in the shell. The first spray water pump of the evaporative air cooler is respectively connected to the plurality of air cooler units through a spray main pipe. An electric butterfly valve is provided on the spray main pipe. The electric butterfly valve divides the plurality of air cooler units into two groups. The first group of air cooler units is connected to the first spray water pump, and the second group of air cooler units is connected to the second spray water pump.

10. A method for enhancing the cooling intensity of a blast furnace during the later stage of its campaign, characterized in that: The method further includes that when the temperature of the blast furnace soft water exceeds the set temperature, turn on the self-priming pump above the spray pond to lift the spray water to the cooling tower A for cooling. Through the first liquid level sensor of the spray pond and the second liquid level sensor of the clean circulating water pond, automatically control the first electric control valve and the second electric control valve, so as to automatically adjust the water volume flowing from the cooling tower A into the spray pond and the clean circulating water pond respectively; at the same time, turn on the second spray water pump, close the electric butterfly valve between the first group of air cooler units and the second group of air cooler units, the first spray water pump supplies water to the first group of air cooler units, and the clean circulating water pond supplies water to the second group of air cooler units through the second spray water pump.

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