Blast furnace open-circuit cooling water collecting and degassing device

Abstract

The utility model relates to a blast furnace open-circuit cooling water collecting and degassing device, and belongs to the field of industrial circulating water of iron and steel plants. A water collecting tank, a connecting pipe, a degassing tank and a drainage pipe are sequentially arranged in the flowing direction of cooling water. The degassing tank is horizontally arranged at the lower part of the water collecting tank and is communicated with the bottom of the water collecting tank through a connecting pipe; an energy dissipation grid is arranged in the water collection tank; the energy dissipation grids are steel grating plates and / or steel bar welded grids; and an exhaust overflow pipe is arranged on the degassing tank. The water collecting tank is used for collecting open-circuit cooling water discharged from the blast furnace equipment, and the energy dissipation grid is used for dissipating kinetic energy of water flow. Water flow in the degassing tank slows down when passing through the suddenly increased pipe diameter, gas carried in water floats upwards after the flow state is stable, and the floating gas is exhausted upwards through the exhaust overflow pipe; and the degassed and stabilized water flow is finally drained by the drainage pipe. The effects of stabilizing the drainage flow state of the blast furnace and removing certain entrained gas are achieved, so that open-circuit drainage of the blast furnace is smoother, and pipeline gas corrosion is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of industrial circulating water in iron and steel plants, and relates to a water collecting and deaerating device for open-circuit cooling water of blast furnaces. Background Art

[0002] The blast furnace cooling water system is a necessary condition for the stable production and operation of blast furnaces. To facilitate the furnace front staff to check for possible water leakage in the blast furnace cooling equipment on the blast furnace platform, the existing open-circuit cooling water circulation system generally collects the drained water into an open collecting tank set on the blast furnace platform first, and then relies on the action of gravity to flow back into the hot water pool in the pump house.

[0003] During the process of collecting drained water by the open collecting tank, gas is easily entrained, making the flow state in the connecting pipeline become a gas-water mixture. According to Bernoulli's principle, when the water flow velocity in the pipeline is too fast, the increase in velocity leads to a decrease in fluid pressure and is prone to form turbulence. Under the turbulent state, the agitation of eddies and vortices promotes the mixing between gas and water flow, and it is also easy to form a low-pressure area under the turbulent state. The formation of the low-pressure area makes it easier for gas to be inhaled, thereby making the flow state of water in the pipeline become a gas-water mixture. The bubbles entrained in water not only increase the frictional head loss, but also aggregate to form air bags, reducing the cross-sectional area of the pipeline for water flow, hindering the water flow, and even causing poor drainage and overflow of the collecting tank in severe cases.

[0004] In addition, the gas in water also has a corrosive effect on metal pipelines. For example, gases such as oxygen and carbon dioxide in water can react chemically with the metal surface, resulting in the corrosion of the metal. The corrosion of the pipeline by oxygen in water is mainly caused by the redox reaction between the dissolved oxygen in water and the metal surface; carbon dioxide dissolved in water will form carbonic acid, and carbonic acid has a certain corrosive effect on metals. This corrosion process is a complex electrochemical process, involving multiple intermediate products and reaction steps. As the inner wall of the pipeline is continuously dissolved and corroded, it may lead to the thinning of the pipeline wall and even the appearance of holes, ultimately resulting in pipeline rupture and leakage. Moreover, the corrosion products and metal ions also affect the water quality and safety to a certain extent. Content of the Utility Model

[0005] In view of this, the purpose of the utility model is to provide a water collecting and deaerating device for open-circuit cooling water of blast furnaces, so as to solve the problems of poor drainage and aggravated pipeline corrosion caused by the entrainment of gas in the drained water of open-circuit cooling water of blast furnaces.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A water collection and degassing device for the open cooling water of a blast furnace is successively provided with a water collection tank, a connecting pipe, a degassing tank and a drain pipe along the cooling water flow direction; the degassing tank is horizontally arranged at the lower part of the water collection tank and is communicated with the bottom of the water collection tank through the connecting pipe; an energy dissipation grid is arranged in the water collection tank, and the energy dissipation grid can dissipate the kinetic energy of water flow, reduce the impact of water flow on the pipeline, and filter large-volume foreign matters from entering the drain pipeline and the degassing tank.

[0008] Optionally, the energy dissipation grid is a steel grille plate and / or a welded steel bar grid.

[0009] Optionally, an exhaust overflow pipe is arranged at the upper part of the degassing tank, and one end of the exhaust overflow pipe far away from the degassing tank extends to the water inlet of the water collection tank.

[0010] Optionally, at least two exhaust overflow pipes are arranged.

[0011] Optionally, a liquid level gauge is arranged on the exhaust overflow pipe.

[0012] Optionally, the inner diameter of the degassing tank is larger than the pipe diameter of the connecting pipe, and the external dimensions of the degassing tank and the connecting pipe are determined after calculation according to the actual engineering situation.

[0013] Optionally, the drain pipe is arranged on one side of the degassing tank far away from the connecting pipe.

[0014] Optionally, a plurality of connecting pipes and water collection tanks are arranged, each connecting pipe is communicated with a separate water collection tank, and one end of each connecting pipe far away from the water collection tank is connected to the same degassing tank.

[0015] Optionally, the water collection tank is arranged on the blast furnace platform, and a hole convenient for the connecting pipe to pass through is opened on the blast furnace platform. The water collection tank can be arranged on the tuyere platform or on each layer of the platform.

[0016] Optionally, a sewage outlet is arranged at the bottom of the degassing tank.

[0017] The beneficial effects of the utility model are as follows:

[0018] The utility model sets an open collecting water tank on the blast furnace platform, which is convenient for workers to observe the water flow state and then leak-check the blast furnace cooling equipment. By setting an energy dissipation grid in the collecting water tank, part of the water flow kinetic energy is dissipated, the impact of the water flow on the drainage pipeline is reduced, the vibration of the subsequent pipeline is alleviated, and at the same time, large-volume foreign matters in the water can be blocked from entering the drainage pipeline, playing a certain filtering role. A degassing tank is horizontally arranged at the lower part of the collecting water tank. Since when the water continuously flows, the volume of the fluid passing through any cross-section of the pipeline per unit time (i.e., the flow rate) remains unchanged, when the cooling water enters the degassing tank with a larger inner diameter through a connecting pipe with a smaller inner diameter, the reduction of the water flow velocity will cause the gas to float, thereby realizing the functions of stable flow state and removing a certain amount of entrained gas. It makes the open-circuit drainage of the blast furnace smoother and reduces the gas corrosion of the pipeline.

[0019] Other advantages, objectives and features of the utility model will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the utility model. The objectives and other advantages of the utility model can be realized and obtained through the following specification. Brief Description of the Drawings

[0020] In order to make the objectives, technical solutions and advantages of the utility model clearer, the utility model will be described in detail preferably with reference to the accompanying drawings, where:

[0021] Figure 1 It is a schematic structural diagram of the device of the utility model.

[0022] Reference Signs:

[0023] 1 Collecting water tank, 2 Energy dissipation grid, 3 Connecting pipe, 4 Degassing tank, 5 Exhaust overflow pipe, 6 Drain pipe, 7 Blast furnace platform. Specific Embodiments

[0024] The following specific examples illustrate the embodiments of the utility model. Those skilled in the art can easily understand other advantages and effects of the utility model from the content disclosed in this specification. The utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the utility model. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the utility model in a schematic manner. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0025] Among them, the attached drawings are only for illustrative purposes, showing schematic diagrams rather than physical diagrams, and should not be construed as a limitation on the present utility model; in order to better illustrate the embodiments of the present utility model, some components in the attached drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the attached drawings may be omitted.

[0026] In the attached drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the attached drawings. It is only for the convenience of describing the present utility model and simplifying the description, 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. Therefore, the terms describing the positional relationship in the attached drawings are only for illustrative purposes and should not be construed as a limitation on the present utility model. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] Please refer to Figure 1 , which is a water collection and degassing device for the open-circuit cooling water of a blast furnace. A water collection tank 1, a connecting pipe 3, a degassing tank 4, and a drain pipe 6 are sequentially arranged along the direction of the cooling water flow; the water collection tank 1 is arranged on the blast furnace platform 7 and is used to collect the open-circuit cooling water drainage of the blast furnace equipment. Multiple water collection tanks 1 can also be arranged on the blast furnace platform 7 to increase the drainage efficiency. There is an opening on the blast furnace platform 7 for the connecting pipe 3 to pass through conveniently; the degassing tank 4 is horizontally arranged below the water collection tank 1 and is connected to the bottom of the water collection tank 1 through the connecting pipe 3; an energy dissipation grid 2 is arranged in the water collection tank 1. On the one hand, it can block large-volume foreign objects from entering the drainage pipeline, and on the other hand, when the cooling water passes through the energy dissipation grid 2, the kinetic energy of the water flow can be reduced, and the vibration of the subsequent pipeline can be alleviated. In some embodiments of the present utility model, the energy dissipation grid 2 is a steel grille plate and / or a welded steel bar grid. Different from ordinary filter screens, the steel energy dissipation grid 2 has a strong bearing capacity for the kinetic energy impact of the cooling water and will not undergo large deformation and damage due to the large water flow impact force. The energy dissipation grid 2 can be set in a single layer or multiple layers according to actual needs.

[0028] The water collection tank 1 can also be placed on other blast furnace platforms to collect the open-circuit cooling water drainage of the cooling walls of the blast furnace body, the top equipment, various instrument detections, etc. The size of the water collection tank 1 can be adjusted according to the actual situation of the project. The number of layers of the energy dissipation grid 2 in the water collection tank 1, as well as details such as the thickness and density of the grid itself, can also be adjusted.

[0029] The inner diameter of the degassing tank 4 is larger than the pipe diameter of the connecting pipe 3. When the cooling water enters the degassing tank 4 with a suddenly increased inner diameter through the connecting pipe 3 with a smaller pipe diameter, the flow rate of the water will decrease, thereby achieving a stable flow state, enabling the gas entrained in the water to float, and playing a role in removing a certain amount of entrained gas. This makes the open-circuit drainage of the blast furnace smoother and reduces the gas corrosion of the pipeline. A sewage outlet (not shown in the attached drawing) is provided at the bottom of the degassing tank 4. The cooling water falling into the degassing tank 4 will contain some impurities, and the impurities accumulated over a long time can be discharged through the sewage outlet.

[0030] An exhaust overflow pipe 5 is provided at the upper part of the degassing tank 4. One end of the exhaust overflow pipe 5 away from the degassing tank 4 passes through the blast furnace platform 7 and extends to the water inlet of the water collection tank 1, so as to lead the water gushing out with water vapor from the degassing tank 4 back to the water collection tank 1 to avoid water spraying outward; according to actual needs, multiple exhaust overflow pipes 5 can be provided, and a liquid level gauge can be provided on the exhaust overflow pipe 5 to facilitate monitoring of the liquid level height. When the liquid level is relatively high, the water inlet flow rate of the water collection tank 1 can be adjusted or the drainage pipeline can be dredged to avoid water overflow or backflow. When the size of the degassing tank 4 is relatively large, multiple exhaust overflow pipes 5 can be provided at its upper part to improve the exhaust efficiency. When the height difference between the degassing tank 4 and the water collection tank 1 is relatively large, the length of the exhaust overflow pipe 5 should be appropriately extended to ensure that the water overflowing into the exhaust overflow pipe 5 can be led back to the water collection tank 1.

[0031] The drain pipe 6 is arranged on the side of the degassing tank 4 away from the connecting pipe 3. After the cooling water entering the degassing tank 4 is degassed and energy-dissipated, it enters the drain pipe 6 smoothly with a stable flow rate and is then discharged through the drain pipe 6.

[0032] A number of connecting pipes 3 and water collection tanks 1 are provided. Each connecting pipe 3 is connected to a separate water collection tank 1, and one end of each connecting pipe 3 away from the water collection tank 1 is connected to the same degassing tank 4; the water in multiple water collection tanks 1 is gathered into a large degassing tank 4 for centralized degassing, improving the efficiency of degassing and energy dissipation. Or each water collection tank is provided with a separate degassing tank connected to it for separate degassing.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A blast furnace open circuit cooling water collection and degassing device, characterized in that: A water collecting tank (1), a connecting pipe (3), a degassing tank (4) and a drain pipe (6) are arranged in sequence along the flow direction of cooling water; the degassing tank (4) is arranged horizontally at the bottom of the water collecting tank (1) and is connected to the bottom of the water collecting tank (1) through the connecting pipe (3); an energy dissipation grid (2) is arranged in the water collecting tank (1), and the energy dissipation grid (2) can dissipate the kinetic energy of water flow, reduce the impact of water flow on the pipeline, and filter large foreign matter.

2. The blast furnace open circuit cooling water collecting and degassing device according to claim 1, characterized in that: The energy dissipation grid (2) is a steel grating plate and / or a steel bar welded grid.

3. The blast furnace open circuit cooling water collecting and degassing device according to claim 1, characterized in that: An exhaust overflow pipe (5) is provided at the upper part of the degassing tank (4), and an end of the exhaust overflow pipe (5) away from the degassing tank (4) extends to the water inlet of the water collecting tank (1).

4. The blast furnace open circuit cooling water collecting and degassing device according to claim 3, characterized in that: At least two exhaust overflow pipes (5) are provided.

5. The blast furnace open circuit cooling water collecting and degassing device according to claim 3, characterized in that: The exhaust overflow pipe (5) is provided with a liquid level meter.

6. The blast furnace open circuit cooling water collecting and degassing device according to claim 1, characterized in that: The inner diameter of the degassing tank (4) is larger than the diameter of the connecting pipe (3).

7. The blast furnace open circuit cooling water collecting and degassing device according to claim 1, characterized in that: The drainage pipe (6) is arranged on a side of the degassing tank (4) away from the communication pipe (3).

8. The blast furnace open circuit cooling water collecting and degassing device according to claim 1, characterized in that: A plurality of the communication pipes (3) and water collecting tanks (1) are provided, each of the communication pipes (3) is connected to a separate water collecting tank (1), and one end of each communication pipe (3) away from the water collecting tank (1) is connected to the same degassing tank (4).

9. The blast furnace open circuit cooling water collecting and degassing device according to claim 1, characterized in that: The water collecting box (1) is arranged on a blast furnace platform (7), and a hole is provided on the blast furnace platform (7) for the communication pipe (3) to pass through.

10. The blast furnace open circuit cooling water collecting and degassing device according to claim 1, characterized in that: The bottom of the degassing tank (4) is provided with a sewage outlet.

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