Blast air supplement system of blast furnace

Abstract

The utility model provides a blast air supplement system of a blast furnace. The blast air supplement system comprises a blast furnace blower; the blast furnace blower supplies air to the blast furnace hot blast stove through an air blowing pipeline, and the blast furnace hot blast stove supplies hot air to the blast furnace; the side face of the air blowing pipeline is connected with an air supplementing pipeline, one end of the air supplementing pipeline is communicated with the air blowing pipeline, and the other end of the air supplementing pipeline is communicated with a standby air source. The standby air source is a standby air blower or a compressed air storage tank. A check valve, a flow meter, a flow regulating valve and a stop valve are arranged on the air supplementing pipeline, and the check valve prevents gas in the air supplementing pipeline from flowing back towards the standby air source. According to the blast furnace blast air supplementing system, air is supplemented for the blast furnace hot blast stove through the air supplementing pipeline, the air supplementing pipeline is connected with the standby air source, the purpose of supplementing air for the blast furnace hot blast stove can be achieved, redundant air sources in a factory can be fully utilized, and the blast furnace blast air supplementing system is environmentally friendly, saves cost, and is simple in structure and easy to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace air blast, in particular to a blast furnace air blast supplementary air system. Background Art

[0002] In metal smelting, in order to fully burn the fuel and increase the furnace temperature, a blast machine is used. In order to support combustion and increase the furnace temperature, the blast furnace also needs blasting. The furnace temperature of the blast furnace is generally between 1200℃ and 1450℃. Therefore, the air from the blast furnace blower will be sent to the blast furnace hot blast furnace, and the blast furnace hot blast furnace will then supply hot air to the blast furnace.

[0003] In actual situations, due to various reasons, blast furnaces are often operated at full load or high load, which makes the air supply of blast furnace blowers insufficient. In summer, as the atmospheric temperature rises, on the one hand, due to the increase in temperature in summer, the volume of gas expands, making it more power-consuming to supply the same quality of air; on the other hand, due to the heavy heat dissipation burden in summer, the blower cannot achieve long-term high-power operation, which also affects the blast air volume.

[0004] The utility model attempts to provide a blast furnace blast air supply system which has low cost, simple structure, environmental protection and easy operation. Utility Model Content

[0005] The utility model attempts to provide a blast furnace blast air supply system which has low cost, simple structure, environmental protection and easy operation.

[0006] The utility model provides a blast furnace blast and air supply system, comprising: a blast furnace blower; a blast furnace hot blast furnace, the blast furnace blower supplies air to the blast furnace hot blast furnace through a blast duct, and the blast furnace hot blast furnace supplies hot air to the blast furnace; the blast duct is connected with an air supply duct at the side, one end of the air supply duct is connected to the blast duct, and the other end of the air supply duct is connected to a spare air source.

[0007] Furthermore, the backup air source is a backup blower or a compressed air storage tank.

[0008] Furthermore, when the backup air source is a compressed air storage tank, the compressed air in the compressed air storage tank is provided by an air compressor.

[0009] Furthermore, at the connection between the air supply duct and the air blast duct, in the cross-sectional view of the air blast duct, the air supply duct is connected with the air blast duct along the tangent direction of the cross section of the air blast duct.

[0010] Furthermore, a check valve, a flow meter, a flow regulating valve and a stop valve are provided on the air supply duct. The check valve prevents the gas in the air supply duct from flowing back toward the backup air source. The flow meter measures the flow in the air supply duct. The flow regulating valve regulates the flow in the air supply duct.

[0011] Furthermore, a temperature transmitter and a pressure transmitter are provided on the air supply duct to measure the temperature and pressure in the air supply duct.

[0012] The blast furnace blast air supply system provided by the utility model supplies air to the blast furnace hot blast stove through the air supply pipe, and the air supply pipe is connected to the spare air source, which can not only achieve the purpose of supplying air to the blast furnace hot blast stove, but also make full use of the redundant air sources in the factory, is environmentally friendly and cost-saving, has a simple structure and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Shown is a schematic structural diagram of a blast furnace blast air supply system according to an embodiment of the utility model.

[0014] Figure 2 Shown Figure 1 Schematic diagram of the connection between the blast duct and the supplementary air duct in the blast duct cross-sectional view in the illustrated embodiment.

[0015] Reference numerals:

[0016] 100: Blast furnace blast air supply system;

[0017] 1: Blast furnace blower; 2: Blast furnace hot blast furnace; 3: Blast duct; 4: Make-up air duct; 5: Standby air source;

[0018] 6: Shut-off valve; 7: Check valve; 8: Flow control valve; 9: Pressure transmitter; 10: Temperature transmitter. DETAILED DESCRIPTION

[0019] In order to provide a further understanding of the purpose, structure, features and functions of the present invention, the present invention is described in detail below with reference to the embodiments.

[0020] Figure 1 Shown is a schematic structural diagram of a blast furnace blast air supply system according to an embodiment of the utility model. Figure 2 Shown Figure 1 Schematic diagram of the connection between the blast duct and the supplementary air duct in the blast duct cross-sectional view in the illustrated embodiment.

[0021] like Figure 1As shown, the embodiment of the utility model provides a blast furnace blast and air supply system 100, including: a blast furnace blaster 1; a blast furnace hot blast furnace 2, the blast furnace blaster 1 supplies air to the blast furnace hot blast furnace 2 through a blast duct 3, and the blast furnace hot blast furnace 2 supplies hot air to the blast furnace; the blast duct 3 is connected to a supply air duct 4 on the side, one end of the supply air duct 4 is connected to the blast duct 3, and the other end of the supply air duct 4 is connected to the standby air source 5. A check valve 7, a flow meter, a flow regulating valve 8 and a stop valve 6 are arranged on the supply air duct 4, the check valve 7 prevents the gas in the supply air duct 4 from flowing back toward the standby air source 5, the flow meter measures the flow in the supply air duct 4, and the flow regulating valve 8 regulates the flow in the supply air duct 4. Further, a temperature transmitter 10 and a pressure transmitter 9 are arranged on the supply air duct 4 to measure the temperature and pressure in the supply air duct.

[0022] When the air volume that the blast furnace blower 1 can provide is insufficient, the air supply pipe 4 can be opened to supply air. The standby air source 5 can be a standby blower or a compressed air storage tank, preferably a compressed air storage tank. The standby blower still has the problem of warming up and parking when it is officially used. It cannot be used immediately, and it cannot be stopped immediately after use, resulting in a waste of energy. The compressed air storage tank can be used as needed, and can be used immediately when needed, and can be closed immediately after use, without wasting energy. The compressed air in the compressed air storage tank can be provided by an air compressor. Generally, factories must consider the needs of the entire factory when selecting and building air compressors, so there is often a certain redundancy in output. The compressed air storage tank can store this part of redundant compressed air to supply air to the blast pipe, and can make good use of this part of redundant compressed air, saving material costs and electricity consumption.

[0023] The blast furnace blast air supply system provided by the utility model supplies air to the blast furnace hot blast stove through the air supply pipe, and the air supply pipe is connected to the spare air source, which can not only achieve the purpose of supplying air to the blast furnace hot blast stove, but also make full use of the redundant air sources in the factory, is environmentally friendly and cost-saving, has a simple structure and is easy to operate.

[0024] Figure 2 Shown Figure 1 Schematic diagram of the connection between the blast duct and the air supply duct in the cross-sectional view of the blast duct in the illustrated embodiment. At the connection between the air supply duct 4 and the blast duct 3, in the cross-sectional view of the blast duct 3, the air supply duct 4 is connected to the blast duct 3 along the tangent direction of the cross section of the blast duct 3. The air flow in the blast duct 3 has dynamic pressure and static pressure. If the air flow in the air supply duct 4 is to enter the blast duct 3, it is necessary to overcome the influence of the static pressure. Therefore, it is selected to be connected to the blast duct 3 along the tangent direction of the cross section of the blast duct 3, so that the influence of the static pressure of the blast duct 3 is minimized.

[0025] On the other hand, in terms of dynamic pressure, it should be avoided as much as possible that the airflow direction of the air flow in the supply air duct 4 is too different from that in the blast duct 3. Therefore, the angle between the airflow in the supply air duct 4 and the airflow in the blast duct 3 should be as small as possible to reduce the momentum loss when the two airflows collide, and also reduce the load of the blast furnace blower 1.

[0026] In the description of the present invention, it is necessary to understand that the terms “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” orientations or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, any changes and modifications made without departing from the spirit and scope of the present invention are within the scope of patent protection of the present invention.

Claims

1. A blast furnace blast air supply system, comprising: Blast furnace blowers; Blast furnace hot blast furnace, the blast furnace blower supplies air to the blast furnace hot blast furnace through the blast duct, and the blast furnace hot blast furnace supplies hot air to the blast furnace; It is characterized in that the blast duct is connected to a supplementary air duct on the side, one end of the supplementary air duct is connected to the blast duct, and the other end of the supplementary air duct is connected to a backup air source.

2. The blast furnace blast air supply system according to claim 1, characterized in that: The backup air source is a backup blower or a compressed air storage tank.

3. The blast furnace blast air supply system according to claim 2, characterized in that: When the backup air source is a compressed air storage tank, the compressed air in the compressed air storage tank is provided by an air compressor.

4. The blast furnace blast air supply system according to claim 1, characterized in that: At the connection between the air supply duct and the air blast duct, in the cross-sectional view of the air blast duct, the air supply duct is in communication with the air blast duct along the tangent direction of the cross section of the air blast duct.

5. The blast furnace blast air supply system according to claim 1, characterized in that: A check valve, a flow meter, a flow regulating valve and a stop valve are arranged on the air supply duct. The check valve prevents the gas in the air supply duct from flowing back toward the backup air source. The flow meter measures the flow in the air supply duct. The flow regulating valve regulates the flow in the air supply duct.

6. The blast furnace blast air supply system according to claim 1, characterized in that: A temperature transmitter and a pressure transmitter are arranged on the air supply duct to measure the temperature and pressure in the air supply duct.

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