oxygen supply system

Abstract

This utility model belongs to the field of blast furnace oxygen supply technology, specifically relating to an oxygen supply system. The oxygen supply system includes: a pressure swing adsorption (PSA) oxygen generator station; a cryogenic oxygen generator station; a first connecting pipe, one end of which is connected to the PSA oxygen generator station and the other end of which is connected to the blast furnace; and a second connecting pipe, one end of which is connected to the cryogenic oxygen generator station and the other end of which is connected to the first connecting pipe.

Description

Technical Field

[0001] This application belongs to the field of blast furnace oxygen supply technology, specifically relating to an oxygen supply system. Background Technology

[0002] Oxygen-enriched blast furnace is a commonly used blast system. Its purpose is to increase smelting intensity, thereby increasing blast furnace output and enhancing the combustion of injected fuel in front of the tuyeres, without increasing air volume or blower power consumption.

[0003] Currently, the vast majority of blast furnaces use cryogenic technology for oxygen production. However, factors such as the designed oxygen enrichment amount, designed oxygen production capacity, and oxygen cost limit the ability of blast furnaces to increase oxygen enrichment rates, and oxygen costs are relatively high. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides an oxygen supply system, which aims to at least partially solve the technical issues of limited oxygen enrichment rate in blast furnaces and high oxygen costs.

[0005] The technical solution of this utility model is as follows:

[0006] An oxygen supply system includes: a pressure swing adsorption (PSA) oxygen generator; a cryogenic oxygen generator; a first connecting pipe, one end of which is connected to the PSA oxygen generator and the other end of which is connected to a blast furnace; and a second connecting pipe, one end of which is connected to the cryogenic oxygen generator and the other end of which is connected to the first connecting pipe.

[0007] In some embodiments, the oxygen supply system further includes: an oxygen mixer connected to the first connecting pipe and located between the pressure swing adsorption oxygen generator and the second connecting pipe; a filter dehumidifier connected to the oxygen mixer; and a blower connected to the first connecting pipe and located between the oxygen mixer and the second connecting pipe.

[0008] In some implementation schemes, along the gas flow direction within the first connecting pipe, the first connecting pipe is provided with a first shut-off valve, a first flow regulating valve, a flow meter, a first quick-cut valve, and a second shut-off valve; wherein, the first shut-off valve, the first flow regulating valve, the flow meter, the first quick-cut valve, and the second shut-off valve are located between the pressure swing adsorption oxygen generator and the oxygen mixer.

[0009] In some implementations, a filter is provided on the first connecting pipe, the filter being located between the first shut-off valve and the first flow regulating valve.

[0010] In some implementations, a flame arrester is provided on the first connecting pipe, the flame arrester being located between the second shut-off valve and the oxygen mixer.

[0011] In some implementations, along the gas flow direction within the first connecting pipe, the first connecting pipe is sequentially provided with an anti-surge valve, a first check valve, an air supply valve, an air distribution valve, a first vent valve, and a shut-off valve; wherein the anti-surge valve, the first check valve, the air supply valve, the air distribution valve, the first vent valve, and the shut-off valve are located between the blower and the blast furnace, and the second connecting pipe is located between the air distribution valve and the first vent valve.

[0012] In some embodiments, the oxygen supply system further includes: a third connecting pipe connected to the first connecting pipe for supplying inert gas to the first connecting pipe; a quick-opening valve located in the third connecting pipe; and at least one third shut-off valve located in the third connecting pipe.

[0013] In some implementations, along the gas flow direction within the second connecting pipe, the second connecting pipe is provided with a fourth shut-off valve, a second vent valve, a fifth shut-off valve, a second quick-cut valve, and a second check valve.

[0014] In some embodiments, a pressure regulating valve and a flow regulating valve are provided on the second connecting pipe along the gas flow direction; wherein the pressure regulating valve and the second flow regulating valve are located between the second vent valve and the fifth shut-off valve.

[0015] In some embodiments, the oxygen supply system further includes a hot blast stove, connected to the first connecting pipe and located between the second connecting pipe and the blast furnace.

[0016] The beneficial effects of this utility model include at least the following:

[0017] Since one end of the first connecting pipe is connected to the pressure swing adsorption (PSA) oxygen generator and the other end is connected to the blast furnace, and one end of the second connecting pipe is connected to the cryogenic oxygen generator and the other end is connected to the first connecting pipe, the oxygen generated by the PSA oxygen generator can be transported to the blast furnace through the first connecting pipe, and the oxygen generated by the cryogenic oxygen generator can be transported to the first connecting pipe through the second connecting pipe, and then to the blast furnace through the first connecting pipe. By supplying oxygen to the blast furnace through the combined PSA and cryogenic oxygen generators, there is no need to modify the cryogenic oxygen generator, which can increase the amount of oxygen entering the blast furnace to meet the oxygen enrichment rate of the blast furnace, so that the blast furnace's production capacity meets the requirements. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an oxygen supply system according to some embodiments.

[0020] In the attached image:

[0021] Pressure swing adsorption oxygen production station 10, cryogenic oxygen production station 20, first connecting pipe 30, second connecting pipe 40, blast furnace 50, oxygen mixer 60, filter dehumidifier 70, blower 80, first shut-off valve 90, first flow regulating valve 100, flow meter 110, first quick-cut valve 120, second shut-off valve 130, filter 140, flame arrester 150, anti-surge valve 160, first check valve 170, air supply valve 180, air distribution valve 190, first vent valve 200, air shut-off valve 210, third connecting pipe 220, quick-opening valve 230, third shut-off valve 240, fourth shut-off valve 250, second vent valve 260, fifth shut-off valve 270, second quick-cut valve 280, second check valve 290, pressure regulating valve 300, second flow regulating valve 310, hot blast stove 320. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] It should be noted that all directional indications in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0026] Currently, blast furnace oxygen supply generally relies on cryogenic technology. This technology produces oxygen with 99.9% purity, which is then added to the cold air supply via an oxygen pressure regulating station. After being heated by a hot blast stove, it is injected into the blast furnace. However, this method has the following drawbacks:

[0027] First, the blast furnace can only inject oxygen at the maximum designed oxygen enrichment rate. The use of cryogenic technology cannot further increase the oxygen enrichment rate. If it is necessary to further increase the oxygen enrichment rate, the oxygen pipeline of the cryogenic technology needs to be completely replaced to increase the oxygen production capacity, which is difficult and economical.

[0028] Second, because blast furnaces do not require high oxygen purity, oxygen produced using cryogenic technology has high purity, resulting in high manufacturing costs and a surplus of quality, making it less economical.

[0029] Based on the above-mentioned technical problems, this application provides an oxygen supply system that aims to at least partially solve the technical problems of limited oxygen enrichment rate in blast furnaces and high oxygen costs.

[0030] The design concept of this application is to simultaneously inject oxygen generated by a pressure swing adsorption oxygen generator and oxygen generated by a cryogenic oxygen generator into the blast furnace, which can increase the oxygen enrichment rate of the blast furnace, reduce oxygen costs, significantly increase blast furnace capacity, and reduce the production cost of molten iron.

[0031] Based on the above design concept, this application provides an oxygen supply system. Combined with... Figure 1 The oxygen supply system includes: a pressure swing adsorption (PSA) oxygen generator station 10, a cryogenic oxygen generator station 20, a first connecting pipe 30, and a second connecting pipe 40. One end of the first connecting pipe 30 is connected to the PSA oxygen generator station 10, and the other end is connected to the blast furnace 50. One end of the second connecting pipe 40 is connected to the cryogenic oxygen generator station 20, and the other end is connected to the first connecting pipe 30.

[0032] The pressure swing adsorption oxygen generator 10 can supply oxygen with a purity of 80%.

[0033] Since one end of the first connecting pipe 30 is connected to the pressure swing adsorption oxygen generation station 10 and the other end is connected to the blast furnace 50, and one end of the second connecting pipe 40 is connected to the cryogenic oxygen generation station 20 and the other end is connected to the first connecting pipe 30, the oxygen generated by the pressure swing adsorption oxygen generation station 10 can be transported to the blast furnace 50 through the first connecting pipe 30, and the oxygen generated by the cryogenic oxygen generation station 20 can be transported to the first connecting pipe 30 through the second connecting pipe 40, and then to the blast furnace 50 through the first connecting pipe 30. By supplying oxygen to the blast furnace 50 through the combined pressure swing adsorption oxygen generation station 10 and the cryogenic oxygen generation station 20, it is not necessary to modify the cryogenic oxygen generation station 20. This can increase the amount of oxygen entering the blast furnace 50 to meet the oxygen enrichment rate of the blast furnace 50, so that the production capacity of the blast furnace 50 can meet the requirements.

[0034] Combination Figure 1 In some embodiments, to supply oxygen to the blast furnace 50, the oxygen supply system further includes an oxygen mixer 60, a filter dehumidifier 70, and a blower 80. The oxygen mixer 60 is connected to the first connecting pipe 30 and is located between the pressure swing adsorption oxygen generation station 10 and the second connecting pipe 40. The filter dehumidifier 70 is connected to the oxygen mixer. The blower 80 is connected to the first connecting pipe 30 and is located between the oxygen mixer and the second connecting pipe 40.

[0035] When the blower 80 is started, the oxygen generated by the pressure swing adsorption oxygen generator 10 enters the oxygen mixer 60 through the first connecting pipe 30. The outside air enters the oxygen mixer 60 after being filtered and dehumidified by the filter dehumidifier 70. In the oxygen mixer 60, it is mixed with the oxygen generated by the pressure swing adsorption oxygen generator 10, and then transported to the blast furnace 50 through the first connecting pipe 30.

[0036] Combination Figure 1 In some embodiments, to control the oxygen within the first connecting pipe 30, a first shut-off valve 90, a first flow regulating valve 100, a flow meter 110, a first quick-cut valve 120, and a second shut-off valve 130 are provided on the first connecting pipe 30 along the gas flow direction within the first connecting pipe 30. The first shut-off valve 90, first flow regulating valve 100, flow meter 110, first quick-cut valve 120, and second shut-off valve 130 are located between the pressure swing adsorption oxygen generator 10 and the oxygen mixer 60.

[0037] The opening and closing of the first connecting pipe 30 can be controlled by the first shut-off valve 90 and the second shut-off valve 130. The flow meter 110 can detect the oxygen flow rate in the first connecting pipe 30. If the oxygen flow rate detected by the flow meter 110 is greater than the first set flow rate value, the first flow regulating valve 100 will adjust to reduce the oxygen flow rate in the first connecting pipe 30. If the oxygen flow rate detected by the flow meter 110 is less than the first set flow rate value, the first flow regulating valve 100 will adjust to increase the oxygen flow rate in the first connecting pipe 30. When maintenance is required on the first connecting pipe 30, it can be quickly shut off by the first quick-cut valve 120.

[0038] Combination Figure 1 In some embodiments, in order to ensure the cleanliness of the oxygen entering the blast furnace 50, a filter 140 is provided on the first connecting pipe 30. The filter 140 is located between the first shut-off valve 90 and the first flow regulating valve 100. The oxygen entering the first connecting pipe 30 is filtered by the filter 140 to remove impurities in the oxygen and ensure the purity of the oxygen supplied to the blast furnace 50.

[0039] Combination Figure 1 In some embodiments, to prevent backfire, a flame arrester 150 is provided on the first connecting pipe 30. The flame arrester 150 is located between the second shut-off valve 130 and the oxygen mixer 60 to ensure production safety.

[0040] Combination Figure 1 In some embodiments, along the gas flow direction within the first connecting pipe 30, the first connecting pipe 30 is sequentially equipped with an anti-surge valve 160, a first check valve 170, an air supply valve 180, an air distribution valve 190, a first vent valve 200, and a shut-off valve 210. The anti-surge valve 160, the first check valve 170, the air supply valve 180, the air distribution valve 190, the first vent valve 200, and the shut-off valve 210 are located between the blower 80 and the blast furnace 50, and the second connecting pipe 40 is located between the air distribution valve 190 and the first vent valve 200.

[0041] The anti-surge valve 160 prevents oxygen from surging within the first connecting pipe 30. The first check valve 170 prevents oxygen from returning to the pressure swing adsorption oxygen generator 10. Opening the air supply valve 180 allows for oxygen delivery. The air distribution valve 190 distributes oxygen within the first connecting pipe 30. The shut-off valve 210 disconnects the first connecting pipe 30. During maintenance, the first vent valve 200 can be opened to release oxygen from the first connecting pipe 30 and depressurize it, ensuring maintenance safety.

[0042] Combination Figure 1In some embodiments, to ensure the oxygen pressure within the first connecting pipe 30, the oxygen supply system further includes a third connecting pipe 220, a quick-opening valve 230, and a third shut-off valve 240. The third connecting pipe 220 is connected to the first connecting pipe 30 and is used to supply inert gas to the first connecting pipe 30. The quick-opening valve 230 is located in the third connecting pipe 220. At least one third shut-off valve 240 is located in the third connecting pipe 220.

[0043] The opening and closing of the third connecting pipe 220 can be controlled by at least one third shut-off valve 240, and the third connecting pipe 220 can be quickly opened by the quick-opening valve 230, so that inert gas can enter the first connecting pipe 30, thereby increasing the oxygen pressure in the first connecting pipe 30.

[0044] In some embodiments, the number of third shut-off valves 240 can be two, with a quick-opening valve 230 located between the two third shut-off valves 240.

[0045] Combination Figure 1 In some embodiments, in order to control the oxygen in the second connecting pipe 40, a fourth shut-off valve 250, a second vent valve 260, a fifth shut-off valve 270, a second quick-cut valve 280 and a second check valve 290 are provided on the second connecting pipe 40 along the gas flow direction in the second connecting pipe 40.

[0046] The opening and closing of the second connecting pipe 40 can be controlled by the fourth shut-off valve 250 and the fifth shut-off valve 270. When maintenance is required on the second connecting pipe 40, it can be quickly shut off by the second quick-cut valve 280. The second check valve 290 prevents oxygen from returning to the cryogenic oxygen generation station 20. During maintenance, the second vent valve 260 can be opened to release the oxygen in the second connecting pipe 40 and depressurize it to ensure maintenance safety.

[0047] Combination Figure 1 In some embodiments, to regulate the flow rate and pressure of oxygen within the second connecting pipe 40, a pressure regulating valve 300 and a flow regulating valve 310 are provided on the second connecting pipe 40 along the gas flow direction. The pressure regulating valve 300 can regulate the pressure of oxygen within the second connecting pipe 40, and the flow regulating valve 310 can regulate the flow rate of oxygen within the second connecting pipe 40. The pressure regulating valve 300 and the flow regulating valve 300 are located between the second vent valve 260 and the fifth shut-off valve 270.

[0048] Combination Figure 1In some embodiments, in order to heat the oxygen entering the blast furnace 50, the oxygen supply system further includes a hot blast stove 320. The hot blast stove 320 is connected to the first connecting pipe 30 and is located between the second connecting pipe 40 and the blast furnace 50. The hot blast stove 320 heats the oxygen entering the blast furnace 50 from the first connecting pipe 30.

[0049] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0050] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0051] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0053] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0054] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. An oxygen supply system, characterized by, include: Pressure swing adsorption oxygen generator; Cryogenic oxygen generation station; The first connecting pipe is connected at one end to the pressure swing adsorption oxygen generation station and at the other end to the blast furnace. The second connecting pipe is connected at one end to the cryogenic oxygen production station and at the other end to the first connecting pipe.

2. The oxygen supply system of claim 1, wherein, The oxygen supply system also includes: An oxygen mixer is connected to the first connecting pipe and is located between the pressure swing adsorption oxygen generator and the second connecting pipe; A filter dehumidifier is connected to the oxygen mixer; A blower is connected to the first connecting pipe and located between the oxygen mixer and the second connecting pipe.

3. The oxygen supply system of claim 2, wherein, Along the gas flow direction in the first connecting pipe, the first connecting pipe is equipped with a first shut-off valve, a first flow regulating valve, a flow meter, a first quick-cut valve, and a second shut-off valve; The first shut-off valve, the first flow regulating valve, the flow meter, the first quick-cut valve, and the second shut-off valve are located between the pressure swing adsorption oxygen generator and the oxygen mixer.

4. The oxygen supply system of claim 3, wherein A filter is provided on the first connecting pipe, and the filter is located between the first shut-off valve and the first flow regulating valve.

5. The oxygen supply system of claim 3, wherein, A flame arrester is provided on the first connecting pipe, and the flame arrester is located between the second shut-off valve and the oxygen mixer.

6. The oxygen supply system of claim 2, wherein, Along the gas flow direction in the first connecting pipe, the first connecting pipe is sequentially equipped with an anti-surge valve, a first check valve, an air supply valve, an air distribution valve, a first vent valve, and an air shut-off valve. The anti-surge valve, the first check valve, the air supply valve, the air distribution valve, the first vent valve, and the air shut-off valve are located between the blower and the blast furnace, and the second connecting pipe is located between the air distribution valve and the first vent valve.

7. The oxygen supply system according to any one of claims 1-6, characterized in that, The oxygen supply system also includes: The third connecting pipe is connected to the first connecting pipe and is used to deliver inert gas to the first connecting pipe; A quick-opening valve is located in the third connecting pipe; At least one third shut-off valve is provided in the third connecting pipe.

8. The oxygen supply system according to any one of claims 1-6, characterized in that, Along the gas flow direction within the second connecting pipe, the second connecting pipe is equipped with a fourth shut-off valve, a second vent valve, a fifth shut-off valve, a second quick-cut valve, and a second check valve.

9. The oxygen supply system according to claim 8, characterized in that, Along the gas flow direction within the second connecting pipe, a pressure regulating valve and a flow regulating valve are provided on the second connecting pipe; The pressure regulating valve and the second flow regulating valve are located between the second vent valve and the fifth shut-off valve.

10. The oxygen supply system according to any one of claims 1-6, characterized in that, The oxygen supply system also includes: The hot blast stove is connected to the first connecting pipe and is located between the second connecting pipe and the blast furnace.

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