Device for balancing soft water supply flow of blast furnace

Abstract

The utility model discloses a device for balancing soft water supply flow of a blast furnace, which comprises a return pipeline, a regulating valve is arranged on the return pipeline, an inlet of the return pipeline is communicated with a main pipeline at the downstream of an outlet of a one-way valve, and an outlet of the return pipeline is communicated with the main pipeline at the upstream of an inlet of a circulating water pump. And the water supply flow with the butterfly valve opening degree below 30% can be conveniently adjusted.

Description

Technical Field

[0001] The utility model relates to the field of iron and steel production, in particular to a device for balancing the water supply flow of soft water in a blast furnace. Background Art

[0002] In modern blast furnace cooling, a soft water closed-loop circulation system is generally adopted. The main supply pumps of the system are generally connected in parallel with two in use and one standby for water supply. A corresponding butterfly valve is installed on the water supply main pipe to adjust the water supply flow, and the adjustment of the flow is mainly carried out according to the technological requirements of the blast furnace. However, this method has the following disadvantages: when the valve opening control is less than 30%, the valve plate of the valve may be damaged due to uneven pressure, resulting in the complete closure of the valve plate, and then the system water supply is cut off, causing irreversible damage to the blast furnace cooling equipment and resulting in accidents. However, this valve cannot be replaced during one furnace campaign (because replacing the water supply main valve of the soft water closed-loop circulation must be carried out under the condition of water cut-off, and the blast furnace using the soft water closed-loop circulation cooling cannot be cut off during one furnace campaign). Content of the Utility Model

[0003] The purpose of the utility model is to provide a device for balancing the water supply flow of soft water in a blast furnace, which is convenient for adjusting the water supply flow when the butterfly valve opening is below 30%.

[0004] A device for balancing the water supply flow of soft water in a blast furnace includes: a return pipeline, a regulating valve is arranged on the return pipeline, the inlet of the return pipeline is communicated with the main pipeline downstream of the outlet of the one-way valve, and the outlet of the return pipeline is communicated with the main pipeline upstream of the inlet of the circulating water pump.

[0005] In one embodiment, two regulating valves are arranged on the return pipeline.

[0006] In one embodiment, the regulating valve is a gate valve of DN150.

[0007] In one embodiment, the inlet of the return pipeline is communicated with the main pipeline upstream of the water supply branch valve.

[0008] In one embodiment, the outlet of the return pipeline is communicated with the main pipeline downstream of the butterfly valve.

[0009] In one embodiment, the return pipeline is communicated with all three main supply pipelines with two in use and one standby.

[0010] Compared with the prior art, the advantages of the device for balancing the water supply flow of soft water in a blast furnace of the utility model are:

[0011] When it is inconvenient to adjust the flow rate by adjusting the butterfly valve 31, the opening degree of the regulating valve 41 is adjusted to regulate the water supply flow rate. For example, when the opening degree of the butterfly valve 31 is controlled to be less than 30%, the valve plate of the valve may be damaged due to uneven pressure. At this time, the opening degree of the butterfly valve 31 is maintained above 30%, and at the same time, the regulating valve 41 is opened, so that a part of the water supply at the outlet of the check valve 33 flows back to the inlet of the circulating water pump 32 through the return pipeline 40, so as to reduce the water supply volume and make the water supply volume drop below 30% of the opening degree of the butterfly valve. Then, by adjusting the opening degree of the regulating valve 41, the water supply volume can be adjusted below 30% of the opening degree of the butterfly valve 31.

[0012] Through the following description and in combination with the accompanying drawings, the present invention will become clearer. These drawings are used to explain the embodiments of the present invention. Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0014] Figure 1 is a schematic structural diagram of a prior art soft water supply pipeline;

[0015] Figure 2 is a schematic structural diagram of a device for balancing the soft water supply flow rate in an embodiment of the present invention;

[0016] Figure 3 is a schematic structural diagram of an embodiment of the present invention in which all three main pipelines of two-for-one standby are provided with return pipelines.

[0017] Among them, 10 is the return main pipe, and 20 is the water supply main pipe;

[0018] 30, 30a, 30b, 30c are the main pipelines;

[0019] 31, 31a, 31b, 31c are the butterfly valves;

[0020] 32, 32a, 32b, 32c are the circulating water pumps;

[0021] 33, 33a, 33b, 33c are the check valves;

[0022] 34, 34a, 34b, 34c are the water supply branch valves;

[0023] 35 is the water supply main valve;

[0024] 40, 40a, 40b, 40c are the return pipelines;

[0025] 41, 41a, 41b, 41c, regulating valve. Detailed implementation manners

[0026] Now, embodiments of the present utility model will be described with reference to the accompanying drawings.

[0027] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the accompanying 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, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0028] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0029] As Figure 1 shown, it is a schematic structural diagram of an existing pipeline. The main pipeline includes main pipelines 30a, 30b, 30c with two in use and one standby. The return water of the blast furnace soft water converges into the return water main pipe 10. The main pipelines 31a, 31b, 31c are connected in parallel between the return water main pipe 10 and the water supply main pipe 20. A water supply main valve 35 is provided on the water supply main pipe 20. On the main pipeline 30a, a butterfly valve 31a, a circulating water pump 32a, a check valve 33a, and a water supply branch valve 34a are provided in sequence from upstream to downstream; on the main pipeline 30b, a butterfly valve 31b, a circulating water pump 32b, a check valve 33b, and a water supply branch valve 34b are provided in sequence from upstream to downstream; on the main pipeline 30c, a butterfly valve 31c, a circulating water pump 32c, a check valve 33c, and a water supply branch valve 34c are provided in sequence from upstream to downstream.

[0030] As Figure 2As shown in the figure, the device of the utility model for balancing the water supply flow of the blast furnace soft water includes: a return pipeline 40, on which a regulating valve 41 is provided. The inlet of the return pipeline 40 is connected to the main pipeline 30 downstream of the outlet of the check valve 33, and the outlet of the return pipeline 40 is connected to the main pipeline 30 upstream of the inlet of the circulating water pump 32. In the case where it is not convenient to adjust the flow rate by adjusting the butterfly valve 31, the water supply flow rate is adjusted by adjusting the opening degree of the regulating valve 41. For example, when the opening degree of the butterfly valve 31 is controlled to be less than 30%, the valve plate of the valve may be damaged due to uneven pressure. At this time, the opening degree of the butterfly valve 31 is maintained above 30%, and at the same time, the regulating valve 41 is opened, so that a part of the water supply at the outlet of the check valve 33 flows back to the inlet of the circulating water pump 32 through the return pipeline 40, achieving the purpose of reducing the water supply volume so that the water supply volume is reduced to less than 30% of the opening degree of the butterfly valve. Then, by adjusting the opening degree of the regulating valve 41, the water supply volume can be adjusted below 30% of the opening degree of the butterfly valve 31. When the opening degree of the butterfly valve 31 is above 30%, the regulating valve 41 can be closed for normal water supply. The utility model adds a return pipeline 40, which does not affect the normal water supply, upgrades and transforms the existing equipment at a small cost, and is suitable for popularization on the existing equipment. The inlet of the return pipeline 40 is connected to the main pipeline 30 upstream of the water supply branch valve 34, maintaining the shut-off function of the water supply branch valve 34 for the main pipeline 30. The outlet of the return pipeline 40 is connected to the main pipeline 30 downstream of the butterfly valve 31. The addition of the return pipeline 40 deprives the butterfly valve 31 of its function of controlling the maximum total flow rate of the main pipeline 30. Two regulating valves 41 are provided on the return pipeline 40, and the two regulating valves 41 are used alternately as a spare to avoid the situation where one of them is damaged and the passage of the return pipeline 40 cannot be closed. Preferably, the regulating valve 41 is a gate valve with a DN150 specification, which has a low price and is convenient for controlling the flow rate.

[0031] As Figure 3 shown, in this embodiment, on the three main supply pipelines 30a, 30b, and 30c with two in use and one as a spare, corresponding return pipelines 40a, 40b, and 40c are respectively connected.

[0032] The inlet of the return pipeline 40a is connected to the main pipeline 30a between the check valve 33a and the water supply branch valve 34a, and the outlet of the return pipeline 40a is connected to the main pipeline 30a between the circulating water pump 32a and the butterfly valve 31a. Two regulating valves 41a are provided on the return pipeline 40a;

[0033] The inlet of the return pipeline 40b is connected to the main pipeline 30b between the check valve 33b and the water supply branch valve 34b, and the outlet of the return pipeline 40b is connected to the main pipeline 30b between the circulating water pump 32b and the butterfly valve 31b. Two regulating valves 41b are provided on the return pipeline 40b;

[0034] The inlet of the return pipeline 40c communicates with the main pipeline 30c between the one-way valve 33c and the water supply branch valve 34c, and the outlet of the return pipeline 40c communicates with the main pipeline 30c between the circulating water pump 32c and the butterfly valve 31c. Two regulating valves 41c are provided on the return pipeline 40c.

[0035] The present invention has been described in conjunction with the best embodiments, but the present invention is not limited to the disclosed embodiments above, and should cover various modifications and equivalent combinations made according to the essence of the present invention.

Claims

1. A device for balancing the flow rate of soft water supply to a blast furnace, characterized in that: include: A reflux pipeline is provided with a regulating valve, the inlet of the reflux pipeline is connected to the main pipeline downstream of the outlet of the one-way valve, and the outlet of the reflux pipeline is connected to the main pipeline upstream of the inlet of the circulating water pump.

2. A device for balancing the flow rate of soft water supply to a blast furnace according to claim 1, characterized in that: The reflux pipeline is provided with two regulating valves.

3. A device for balancing the flow rate of soft water supply to a blast furnace according to claim 1, characterized in that: The regulating valve is a DN150 gate valve.

4. The device for balancing the flow rate of soft water supply to a blast furnace according to claim 1, characterized in that: The inlet of the return pipeline is communicated with the main pipeline upstream of the water supply branch valve.

5. The device for balancing the flow rate of soft water supply to a blast furnace according to claim 1, characterized in that: The outlet of the reflux pipeline is communicated with the main pipeline downstream of the butterfly valve.

6. A device for balancing the flow rate of soft water supply to a blast furnace according to any one of claims 1 to 5, characterized in that: The three main supply pipelines, two for use and one for backup, are all connected with the return pipeline.

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