Hot water closed circulation cooling system at upper part of blast furnace body and blast furnace cooling system

Abstract

The utility model relates to a blast furnace, in particular to a blast furnace body upper hot water closed circulation cooling system and a blast furnace cooling system, which comprise a second water supply pipe, an upper cooling wall, a second water return pipe, a second degassing tank and a water replenishing system connected to the second degassing tank, the water replenishing system is used for replenishing cooling water into the blast furnace body upper hot water closed circulating cooling system, and the upper cooling wall is arranged at the upper part of the blast furnace body and / or a furnace throat steel brick part. The closed hot water circulating cooling system independent of other cooling walls in the cooling system is adopted at the part with relatively low thermal load at the upper part of the blast furnace body, so that the cooling system takes away less heat at the upper part of the blast furnace body, the fuel consumption in the furnace is reduced, and the cooling walls in the furnace are maintained at relatively high temperature; and the phenomena of thickening, nodulation and the like caused by supercooling of the hot surface of the cooling wall are avoided, so that airflow in the furnace is uniformly distributed and stably ascends, and the production of the blast furnace is stabilized.

Description

Technical Field

[0001] The utility model relates to a blast furnace, in particular to a hot water closed circulation cooling system for the upper part of a blast furnace body and a blast furnace cooling system. Background Art

[0002] At present, the cooling system of blast furnace mainly has cooling methods such as "one string to the top" and "segmented series connection". No matter which cooling method is used, cooling water is used to take away the heat of the cooling equipment. The "one string to the top" process cannot realize the independent adjustment of the cooling water volume and temperature of a certain section of the cooling wall. The "segmented series connection" process can separate a certain section or several sections of the cooling wall and adjust the water volume of these sections of the cooling wall. However, the cooling water must be cooled by coolers such as evaporative air coolers before being supplied to the blast furnace. For parts with higher heat loads such as the furnace hearth, furnace belly and the middle and lower parts of the furnace body, lower cooling water temperatures are indeed required. However, for parts with relatively low heat loads such as the upper part of the furnace body and the throat, if cooled cold water is also used for cooling, on the one hand, more heat will be taken away, resulting in high fuel consumption. On the other hand, it is easy to cause overcooling inside the cooling wall, resulting in thickening and nodules in the furnace, affecting the air flow distribution in the furnace, and causing unstable production.

[0003] Therefore, higher temperature cooling water is required for cooling the upper part of the furnace body and the throat, but the existing blast furnace cooling system is unable to provide higher temperature cooling water for cooling the upper part of the furnace body and the throat. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a hot water closed circulation cooling system for the upper part of a blast furnace shaft and a blast furnace cooling system to solve the problems in the background technology.

[0005] In order to achieve the above object, the utility model provides the following technical solutions:

[0006] A closed-loop hot water cooling system for the upper part of a blast furnace shaft comprises a second water supply pipe, an upper cooling stave, a second water return pipe, a second degassing tank and a water replenishment system connected to the second degassing tank in a closed-loop series connection, wherein the water replenishment system is used to replenish cooling water to the closed-loop hot water cooling system for the upper part of the blast furnace shaft, and the upper cooling stave is arranged at the upper part of the blast furnace shaft and / or the throat steel brick part.

[0007] Furthermore, the second water supply pipe includes a second water supply main pipe, a second water supply ring pipe and a second water supply branch pipe which are sequentially connected along the flow direction of the cooling water.

[0008] Furthermore, the second water return pipe includes a second water return branch pipe, a second water return ring pipe and a second water return main pipe which are sequentially connected along the flow direction of the cooling water.

[0009] Furthermore, it also includes a second water pump connected to the second water supply pipe to drive the forced circulation cooling of the hot water closed circulation cooling system on the upper part of the blast furnace body.

[0010] Furthermore, the upper cooling wall includes at least two cooling walls connected in series.

[0011] A blast furnace cooling system comprises an evaporative air cooler, a first water pump, a first water supply main pipe, a first water supply loop pipe, a first water supply branch pipe, a lower cooling wall, a middle cooling wall, a first return water branch pipe, a first return water loop pipe, a first return water main pipe and a first degassing tank which are circulated in series, wherein the lower cooling wall and the middle cooling wall are respectively arranged in the lower area and the upper area of ​​the blast furnace body, and also comprises the hot water closed circulation cooling system on the upper part of the blast furnace body.

[0012] The beneficial effects of the utility model are:

[0013] The utility model provides a closed hot water circulation cooling system for the upper part of a blast furnace shaft and a blast furnace cooling system. In the upper part of the blast furnace shaft where the heat load is relatively low, a closed hot water circulation cooling system which is independent of a middle cooling wall and a lower cooling wall is adopted, so that the heat taken away by the hot water circulation in the upper part of the blast furnace shaft is smaller, and the fuel consumption in the furnace is reduced. At the same time, the cooling wall in the furnace is maintained at a relatively higher temperature, and the phenomenon of thickening and nodules caused by overcooling of the hot surface of the cooling wall can be avoided, and the airflow distribution in the furnace can be kept uniform and stable upward, so as to stabilize the blast furnace production.

[0014] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and research, or can be taught from the practice of the present invention to some extent. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be described in detail below in conjunction with the accompanying drawings, in which:

[0016] Figure 1 The schematic diagram of the existing cooling system is shown below (taking "one string to the top" as an example);

[0017] Figure 2 It is a structural schematic diagram of a hot water closed circulation cooling system for the upper part of a blast furnace body in the utility model;

[0018] Figure 3 It is a schematic diagram of the structure of the cooling wall with a two-water-head serpentine tube layout;

[0019] Figure 4The utility model is a structural schematic diagram of a blast furnace cooling system.

[0020] Figure numerals: second water pump 1, second water supply main 2, second water supply loop 3, second water supply branch 4, upper cooling wall 5, second return water branch 6, second return water loop 7, second return water main 8, second degassing tank 9, make-up water system 10, evaporative air cooler 11, first water pump 12, first water supply main 13, first water supply loop 14, first water supply branch 15, lower cooling wall 16, middle cooling wall 17, first return water branch 18, first return water loop 19, first return water main 20, first dewatering tank 21. DETAILED DESCRIPTION

[0021] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. The following embodiments and the features in the embodiments can be combined with each other without conflict.

[0022] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present utility model. In order to better illustrate the embodiments of the present utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0023] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back" and the like indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0024] like Figure 1As shown, a blast furnace cooling system in the prior art adopts a "one-to-top" structure, including a circulating series evaporative air cooler, a first water pump, a first water supply main pipe, a first water supply loop pipe, a first water supply branch pipe, a cooling wall, a first return water branch pipe, a first return water loop pipe, a first return water main pipe and a first degassing tank, wherein the cooling wall includes a B cooling wall (lower cooling wall), an S cooling wall (middle cooling wall) and an R cooling wall (upper cooling wall) connected in series from bottom to top along the blast furnace shaft, that is, cooling walls arranged in the lower, middle and upper parts of the blast furnace shaft respectively; of course, the B cooling wall, the S cooling wall and the R cooling wall can be further divided into B1 cooling wall, B2 cooling wall ..., S1 cooling wall, S2 cooling wall ... and R1 cooling wall, R2 cooling wall ... connected in series according to the specifications of the furnace shaft.

[0025] The problem with the above-mentioned blast furnace cooling system is that all cooling water in the blast furnace cooling system needs to be cooled by coolers such as evaporative air coolers before being supplied to the blast furnace. For parts with higher heat loads such as the hearth, belly and middle and lower parts of the furnace body, a lower cooling water temperature is indeed required. However, for parts with relatively low heat loads such as the upper part of the furnace body and the throat, if cold water that has been cooled by evaporative air coolers is also used for cooling, on the one hand, more heat will be taken away, resulting in high fuel consumption. On the other hand, it is easy to cause overcooling of the cooling wall, resulting in thickening and nodules in the furnace, affecting the air flow distribution in the furnace, and causing unstable production.

[0026] See also Figure 2-Figure 3 , which is a hot water closed circulation cooling system for the upper part of a blast furnace, comprising a second water pump 1, a second water supply main pipe 2, a second water supply ring pipe 3, a second water supply branch pipe 4, an upper cooling wall 5, a second return water branch pipe 6, a second return water ring pipe 7, a second return water main pipe 8, a second degassing tank 9 and a water replenishment system 10 connected to the second degassing tank 9 in a closed circulation series connection;

[0027] The working principle of the hot water closed circulation cooling system on the upper part of the blast furnace shaft is: first, the water replenishment system 10 introduces soft water into the hot water closed circulation cooling system on the upper part of the blast furnace shaft for closed circulation, so that the cooling water in the upper cooling wall 5 does not pass through coolers such as evaporative air coolers for cooling. After being heated by the heat load in the furnace, the temperature continues to rise and then stabilizes at a higher temperature, forming a hot water closed circulation cooling system. During the hot water closed circulation process, water can be replenished into the hot water closed circulation cooling system on the upper part of the blast furnace shaft through the water replenishment system 10.

[0028] In the upper part of the blast furnace body where the heat load is relatively low, the heat removed by hot water circulation is smaller, reducing the fuel consumption in the furnace; the closed circulation system can reduce water consumption; at the same time, the upper cooling wall 5 is maintained at a relatively higher temperature, which can avoid the thickening and nodules caused by the overcooling of the hot surface of the upper cooling wall 5, thereby maintaining a uniform and stable upward airflow distribution in the furnace and stabilizing the blast furnace production.

[0029] In addition, the water replenishment system 10 can replenish water to the cooling system to replenish water to the system after the upper cooling wall 5 or the pipeline leaks locally, so as to maintain a stable water volume. At the same time, the circulating water temperature of the system can be adjusted by replenishing water when the circulating water temperature is too high.

[0030] Furthermore, the system can be applied to the upper part of the furnace body, the middle part of the furnace body and the throat steel brick part with cooling wall.

[0031] Furthermore, since the system needs to ensure that the cooling water is maintained at a relatively high temperature, the amount of cooling water cannot be too large, and the upper cooling wall 5 adopts a two-water-head serpentine pipe layout structure.

[0032] In another embodiment, the system may not use a second water pump for forced circulation cooling, but instead adopt a natural evaporation cooling process. On the one hand, the temperature of the cooling wall is higher during evaporation cooling, and the adjustment range for preventing furnace body nodules is wider. On the other hand, it can also reduce the energy consumption of the water pump. It is only necessary to add soft water as cooling water through the water supply system when the system is lacking or the temperature is too high.

[0033] Specifically, the water replenishment system 10 can be specifically configured as a soft water inlet pipe.

[0034] See also Figure 4 In another embodiment, a blast furnace cooling system is provided, comprising an evaporative air cooler 11, a first water pump 12, a first water supply main pipe 13, a first water supply loop pipe 14, a first water supply branch pipe 15, a lower cooling stave 16, a middle cooling stave 17, a first return water branch pipe 18, a first return water loop pipe 19, a first return water main pipe 20 and a first degassing tank 21, the lower cooling stave 16 and the middle cooling stave 17 are respectively arranged in the lower area and the upper area of ​​the blast furnace shaft;

[0035] The key point of this embodiment is that it also includes a hot water closed circulation cooling system on the upper part of the blast furnace shaft, so that the upper cooling wall 5 in the blast furnace cooling system is relatively independent of the lower cooling wall 16 and the middle cooling wall 17, and the cooling water in the upper cooling wall 5 does not need to be cooled by the evaporative air cooler 11, thereby ensuring that the part of the blast furnace cooling system located in the upper area of ​​the blast furnace shaft is maintained at a relatively higher temperature, which can avoid the phenomenon of thickening and nodules caused by overcooling of the hot surface of the cooling wall 5, and can keep the airflow distribution in the furnace uniform and stable upward, thereby stabilizing the blast furnace production.

[0036] It should be noted that the hot water closed circulation cooling system on the upper part of the blast furnace body is not only applicable to the cooling system of the "one string to the top" structure, but also to the "segmented series" cooling system.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. A hot water closed circulation cooling system for the upper part of a blast furnace, characterized in that: It comprises a second water supply pipe, an upper cooling wall, a second water return pipe, a second degassing tank and a water replenishment system connected to the second degassing tank in a closed cycle series connection. The water replenishment system is used to replenish cooling water to the hot water closed cycle cooling system on the upper part of the blast furnace body. The upper cooling wall is arranged on the upper part of the blast furnace body and / or the throat steel brick part.

2. The hot water closed circulation cooling system for the upper part of the blast furnace shaft according to claim 1, characterized in that: The second water supply pipe includes a second water supply main pipe, a second water supply ring pipe and a second water supply branch pipe which are sequentially connected along the flow direction of the cooling water.

3. The hot water closed circulation cooling system for the upper part of the blast furnace shaft according to claim 1, characterized in that: The second water return pipe includes a second water return branch pipe, a second water return ring pipe and a second water return main pipe which are sequentially connected along the flow direction of cooling water.

4. The hot water closed circulation cooling system for the upper part of the blast furnace shaft according to claim 1, characterized in that: It also includes a second water pump connected to the second water supply pipe to drive the forced circulation cooling of the hot water closed circulation cooling system on the upper part of the blast furnace shaft.

5. The hot water closed circulation cooling system for the upper part of the blast furnace shaft according to claim 1, characterized in that: The upper cooling wall comprises at least two cooling walls connected in series.

6. A blast furnace cooling system, comprising an evaporative air cooler, a first water pump, a first water supply main pipe, a first water supply loop pipe, a first water supply branch pipe, a lower cooling wall, a middle cooling wall, a first return water branch pipe, a first return water loop pipe, a first return water main pipe and a first degassing tank, which are circulated in series, and the lower cooling wall and the middle cooling wall are arranged in the lower area and the upper area of ​​the blast furnace shaft respectively, characterized in that: It also includes a hot water closed circulation cooling system for the upper part of the blast furnace shaft according to any one of claims 1-5.

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