Converter gas storage device and converter steelmaking production line

Abstract

The invention discloses a converter gas storage device and a converter steelmaking production line, and belongs to the technical field of smelting. The converter gas storage device comprises a gas cabinet and an alkali spraying system. The gas holder comprises an inlet pipe used for inputting gas. The alkali spraying system is provided with a nozzle which is arranged in the inlet pipe and used for spraying out alkali liquor. Alkali liquor is sprayed into the inlet pipe through the alkali spraying system, and the alkali liquor and converter gas are mixed and then enter the converter gas cabinet. The alkali liquor neutralizes the acidity of the condensate water, so that the PH value of the condensate water on the bottom plate and the side plate of the converter gas holder is adjusted to 7-8, the purpose of retarding corrosion of the steel structure of the gas holder is achieved, and the service life of the converter gas holder is prolonged. The continuous and stable operation duration of the gas holder can be prolonged, the situation that production halt overhaul is caused by corrosion, and converter gas recovery is affected is avoided, and the economic benefit of 5 million yuan per year can be increased for an enterprise according to the fact that the overhaul duration is shortened by 10 days every year.

Description

Technical Field

[0001] The present application belongs to the technical field of smelting, and in particular relates to a converter gas storage device and a converter steelmaking production line. Background Art

[0002] Converter gas holder is an important facility for recovering, storing and transporting converter gas. The total volume of converter gas processed by large steel plants can reach 4.8 million cubic meters per day. 3 The average converter gas volume processed instantaneously is 200,000 m 3 / h, maximum 600,000 m 3 / h.

[0003] Converter gas holders are primarily composed of steel components. Converter gas contains approximately 17% CO2 and 60% CO. When CO2 dissolves in the converter gas condensate, it forms an acidic solution with a pH of approximately 5-6 on the steel surfaces within the gas holder, inducing acidic corrosion in areas such as the steel floor and side panels. Furthermore, the presence of O2 and Cl ions in the condensate exacerbates localized corrosion, leading to holes or cracks in the steel floor and side panels, ultimately causing gas leaks. Due to the high CO concentration in the gas, leaks can easily cause poisoning. Furthermore, leaked gas can ignite or explode if exposed to open flames or high temperatures. Summary of the Invention

[0004] The present application aims to at least to some extent solve the technical problem of easy corrosion of converter gas holders. To this end, the present application provides a converter gas storage device and a converter steelmaking production line.

[0005] In a first aspect, an embodiment of the present application provides a converter gas storage device, comprising:

[0006] a gas holder, the gas holder comprising an inlet pipe for inputting gas;

[0007] An alkali spraying system is provided with a nozzle, which is arranged in the inlet pipe and is used for spraying alkali solution.

[0008] In some embodiments, the gas cabinet further includes a partition system disposed in the inlet pipe, and the nozzle is disposed at the front side of the partition system along the flow direction of the gas.

[0009] In some embodiments, the isolation system includes a butterfly valve and a water seal device.

[0010] In some embodiments, the alkali spraying system comprises:

[0011] Lye tank, used to store lye;

[0012] a spray gun having the nozzle;

[0013] A connecting pipe, one end of which is connected to the alkali solution tank and the other end of which is connected to the spray gun;

[0014] The alkali solution pump is installed on the connecting pipe.

[0015] In some embodiments, there are a plurality of spray guns, and the plurality of spray guns are spaced apart around the circumference of the inlet pipe.

[0016] In some embodiments, the gas cabinet further includes a drainer, and the converter gas storage device further includes a pH online detector with a detection end disposed in the drainer.

[0017] In some embodiments, the alkali spraying system further includes a regulating valve installed on the connecting pipe.

[0018] In some embodiments, the gas cabinet further includes a controller, which is electrically connected to the regulating valve and the pH online detector. The controller adjusts the opening of the regulating valve based on the pH value detected by the pH online detector.

[0019] In some embodiments, the controller is also electrically connected to the alkali liquid pump; the controller controls the alkali liquid pump to start in response to the start-up signal of the converter; the controller also controls the alkali liquid pump to stop in response to the shutdown signal of the converter.

[0020] In a second aspect, an embodiment of the present application provides a converter steelmaking production line, comprising the converter gas storage device described in the first aspect above.

[0021] The present invention has at least the following beneficial effects:

[0022] The converter gas storage device includes a gas holder and an alkali spraying system. The gas holder includes an inlet pipe for inputting gas. The alkali spraying system has a nozzle, which is arranged in the inlet pipe for spraying out alkali solution. The present application sprays alkali solution into the inlet pipe through the alkali spraying system, and the alkali solution mixes with the converter gas and enters the converter gas holder. The alkali solution neutralizes the acidity of the condensed water, so that the pH value of the condensed water on the bottom plate and side plate of the converter gas holder is adjusted to 7-8, thereby achieving the purpose of slowing down the corrosion of the gas holder steel structure and extending the service life of the converter gas holder. It can increase the continuous and stable operation time of the gas holder, avoid shutdowns for maintenance due to corrosion, and affect the recovery of converter gas. Calculated based on shortening the maintenance time by 10 days each year, it can increase the economic benefits of the enterprise by 5 million yuan per year. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 A schematic structural diagram of a converter gas storage device in one or more embodiments of the present application is shown.

[0025] Reference numerals:

[0026] 100-Converter gas storage device, 110-Gas cabinet, 111-Inlet pipe, 112-Drainer, 113-Partition system, 1131-Butterfly valve, 1132-Water seal device, 120-Alkali spraying system, 120a-Nozzle, 121-Alkali liquid tank, 122-Spray gun, 123-Connecting pipe, 124-Alkali liquid pump, 125-Regulating valve, 130-PH online detector, 140-Controller. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship and movement status of various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0029] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0030] In addition, in the present invention, descriptions such as "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] At present, the main anti-corrosion technologies for converter gas holders in the industry include: anti-corrosion coatings, corrosion-resistant materials, electrochemical protection, spraying corrosion inhibitors, etc.

[0032] Anti-corrosion coating: By spraying an anti-corrosion coating on the gas tank's interior floor and side panels, the steel structure is isolated from corrosive media, achieving corrosion protection. Commonly used coatings include paint, epoxy resin, polyurethane, and acrylic resin. Anti-corrosion coatings require regular reapplication, resulting in a long construction period, typically around 30 days. The limited space inside the gas tank and the complex steel structure make construction difficult and costly.

[0033] Corrosion-resistant materials: Using corrosion-resistant materials such as high-strength stainless steel and nickel-based alloys to construct steel components such as gasholder side panels and bottom panels can significantly improve the corrosion resistance of converter gasholders. However, using high-strength stainless steel for gasholder steel structures requires approximately 2,500 tons of steel per gasholder, which is extremely costly.

[0034] Electrochemical protection: Electrochemical protection is also a commonly used corrosion prevention technology, and it includes cathodic protection and anodic protection. Cathodic protection involves spraying a layer of active metal onto the surface of the gasholder's internal components, which acts as the cathode in the electrolytic cell, providing protection. Anodic protection involves connecting the gasholder's internal steel structure to the anode in the electrolytic cell. Through anodic oxidation, a dense oxide film forms on the metal surface. Electrochemical protection is typically installed during the gasholder's construction phase, but after reaching the end of its service life, it is difficult to re-install and maintain. It also consumes electricity and is costly.

[0035] Spraying corrosion inhibitor: A certain amount of corrosion inhibitor is sprayed in the cooling tower in front of the gas tank. However, during the process of transporting the converter gas to the gas tank, most of the gas condensate is discharged, and the corrosion inhibitor cannot effectively enter the gas tank. In addition, the corrosion inhibitor mainly plays a scale inhibition function and has no pH adjustment effect. After testing, the pH of the gas tank condensate is still 5-6, which is acidic.

[0036] The applicant previously applied for a Chinese utility model patent, CN214612609U, which discloses a converter gas cooling device. This patent modified the cooling tower by adding an atomizing spray assembly to the cooling tower. This atomizing spray assembly can spray alkali solution, but in practice, it has the following problems:

[0037] (1) The cooling tower sprays a large amount of water (about 200 cubic meters per hour), which requires the consumption of a large amount of alkali solution and is very costly.

[0038] (2) In the industry, the distance between the steelmaking cooling tower and the converter gas holder is quite long, ranging from several kilometers to hundreds of meters. During the converter gas transportation process, condensed water is continuously discharged through the drainer, causing the alkali solution to be discharged along with it, preventing most of the alkali solution from entering the converter gas holder. However, carbon dioxide in the converter gas is always present and will continue to dissolve in water to cause acidic corrosion. After testing, the pH value of the condensed water from the cooling tower to the converter gas holder gradually decreased, while the pH before and inside the converter gas holder remained 5-6, indicating that the corrosion situation in the converter gas holder did not change.

[0039] Therefore, in the related art, converter gas holders have the technical problem of being easily corroded. The embodiments of the present application provide a converter gas storage device and a converter steelmaking production line, which can at least to some extent solve the technical problem of converter gas holders being easily corroded.

[0040] The present application is described below with reference to specific embodiments and with reference to the accompanying drawings:

[0041] like Figure 1 As shown, the converter gas storage device 100 includes a gas tank 110 and an alkali spraying system 120. The gas tank 110 includes an inlet pipe 111 for inputting gas. The alkali spraying system 120 has a nozzle 120a, which is arranged in the inlet pipe 111 for spraying alkali solution.

[0042] The specific structure of the gas holder 110 is diverse and well-known to those skilled in the art, as shown in patent publication number CN2349438Y and other patents, and is not limited or detailed in this application. It is understood that the gas holder 110 includes an inlet pipe 111 and a drainer 112. External gas enters the gas holder 110 through the inlet pipe 111 and is stored within the gas holder 110. During the storage and transportation of gas, condensation is generated due to temperature changes. The function of the drainer 112 is to periodically or continuously drain the condensation within the gas holder 110 to prevent the accumulated water from corroding the gas holder 110 or affecting the gas quality.

[0043] The nozzle 120 a of the alkali spraying system 120 is used to spray out alkali solution. Since the nozzle 120 a is arranged in the inlet pipe 111 , the alkali solution is sprayed in the inlet pipe 111 .

[0044] The application sprays alkali into the inlet pipe 111 through the alkali spraying system 120, and the alkali is mixed with the converter gas and then enters the converter gas tank 110. The alkali neutralizes the acidity of the condensed water, so that the PH value of the condensed water on the bottom plate and the side plate of the converter gas tank 110 is adjusted to 7-8, thereby achieving the purpose of slowing down the corrosion of the steel structure of the gas tank 110 and prolonging the service life of the converter gas tank 110. The continuous and stable operation time of the gas tank 110 can be improved, and the production stop for maintenance due to corrosion and the influence on converter gas recovery can be avoided. According to the calculation of shortening the maintenance time by 10 days per year, the economic benefit of 5 million yuan per year can be increased for the enterprise.

[0045] The structure of the alkali spraying system 120 is various, which can include a storage tank for storing alkali, a nozzle for spraying alkali, a pipeline for conveying alkali, and the like.

[0046] In some embodiments, the gas tank 110 further comprises a partition system 113 arranged in the inlet pipe 111, and the nozzle 120a is arranged on the front side of the partition system 113 along the flow direction of the gas.

[0047] The partition system 113 can prevent the gas from flowing through in the case of safety maintenance, gas leakage or emergency, prevent the gas from leaking into the partitioned area, and avoid accidents caused by gas leakage. The nozzle 120a is arranged on the front side of the partition system 113, when the partition system 113 is in the open state, the alkali is mixed with the gas through the nozzle 120a and enters the gas tank 110, ensuring that the neutralization effect of the alkali covers the entire storage space; even if the partition system 113 is closed due to maintenance or emergency, the nozzle 120a can still continue to spray alkali to the front section of the inlet pipe 111, continuously neutralize the condensed water, and avoid local acid corrosion of the inlet pipe 111. Moreover, the converter gas tank 110 is generally arranged in multiple parallel arrangements, and the nozzle 120a is arranged on the front side of the partition system 113, so that the gas can be cut off at any time for maintenance without affecting the operation and recovery of the other converter gas tanks 110.

[0048] In some embodiments, the partition system 113 comprises a butterfly valve 1131 and a water seal device 1132. The water seal device 1132 uses the static pressure generated by the water column height to block the gas and prevent it from flowing backward or leaking. When the gas pressure exceeds a certain value, the water seal is broken, and the gas can pass through; after the pressure decreases, the water seal automatically restores the seal. The butterfly valve 1131 realizes the on-off control of the pipeline by rotating the valve plate by 90°, and has the characteristics of quick opening and closing and small flow resistance. By combining the butterfly valve 1131 with the water seal device 1132, mechanical cutting and hydraulic sealing are formed, which greatly improves the safety of the converter gas tank 110. The structure of the butterfly valve 1131 and the water seal device 1132 is known to those skilled in the art, and will not be described here.

[0049] In some embodiments, the alkali spraying system 120 includes an alkali liquid tank 121, a spray gun 122, a connecting pipe 123, and an alkali liquid pump 124. The alkali liquid tank 121 is used to store alkali liquid. The spray gun 122 has a nozzle 120a. One end of the connecting pipe 123 is connected to the alkali liquid tank 121, and the other end is connected to the spray gun 122. The alkali liquid pump 124 is installed on the connecting pipe 123. The alkali liquid pump 124 pumps the alkali liquid in the alkali liquid tank 121 into the spray gun 122, and the alkali liquid is finally sprayed into the inlet pipe 111 through the nozzle 120a of the spray gun 122. It should be noted that the alkali liquid tank 121 has an outlet, and one end of the connecting pipe 123 is connected to the outlet of the alkali liquid tank 121; the spray gun 122 has an inlet, and the other end of the connecting pipe 123 is connected to the inlet of the spray gun 122.

[0050] In some embodiments, there are multiple spray guns 122 , and the multiple spray guns 122 are arranged at intervals around the circumference of the inlet pipe 111 , which helps to improve the uniformity of mixing the coal gas and the alkali solution.

[0051] In some embodiments, the converter gas storage device 100 further includes a pH online detector 130 having a detection end disposed in the drainer 112. The pH online detector 130 detects the pH value of the condensed water in real time, so that the operator can adjust the amount of alkali solution sprayed.

[0052] In some embodiments, the alkali spraying system 120 further includes a regulating valve 125 installed on the connecting pipe 123. With this design, the operator can adjust the flow rate of the nozzle 120a by adjusting the opening of the regulating valve 125, so as to facilitate the operator to adjust the pH value of the condensed water.

[0053] In some embodiments, the gas tank 110 further includes a controller 140 , which is electrically connected to the regulating valve 125 and the pH online detector 130 . The controller 140 controls the opening of the regulating valve 125 based on the pH value detected by the pH online detector 130 .

[0054] The regulating valve 125 is an automatic regulating valve, such as a solenoid valve, a hydraulically controlled valve, or an air-controlled valve. The controller 140 automatically adjusts the opening of the regulating valve 125 based on the pH value to control the amount of alkali solution sprayed out. When the controller 140 detects that the pH value of the condensed water is relatively low, the controller 140 controls the regulating valve 125 to open wider, increases the amount of alkali solution sprayed out, improves the neutralization effect, and increases the pH value of the condensed water, so that the pH value of the condensed water meets the set interval range. When the controller 140 detects that the pH value of the condensed water is relatively high, the controller 140 controls the regulating valve 125 to open smaller, reduces the amount of alkali solution sprayed out, and reduces the pH value of the condensed water, so that the pH value of the condensed water meets the set interval range. With this design, the regulating valve 125 is automatically adjusted, with a high degree of automation and reduced labor intensity.

[0055] In some embodiments, under the regulation of the alkali spray system 120 , the pH value of the condensed water in the gas tank is 7-8.

[0056] In some embodiments, the controller 140 is also electrically connected to the alkali liquid pump 124; the controller 140 controls the alkali liquid pump 124 to start in response to the start-up signal of the converter; the controller 140 also controls the alkali liquid pump 124 to stop in response to the shutdown signal of the converter.

[0057] When the converter is operating, it produces gas, which is stored in gas tank 110. This controls the operation of alkali pump 124 to ensure the pH of the condensed water remains within a set range. When the converter is stopped, it no longer produces gas, and no new gas enters gas tank 110. Alkali pump 124 is then shut down to prevent waste of alkali solution. This design allows alkali spraying system 120 to automatically operate or shut down based on the converter's operating status, resulting in a high degree of automation and reduced labor intensity.

[0058] In some embodiments, the alkali solution has a concentration of 25% to 35% NaOH solution, including 25% and 35%. In this concentration range, the neutralization effect of the alkali solution is good, and there is substantially no crystallization on the inner wall of the gas tank 110.

[0059] Based on the same inventive concept, an embodiment of the present application further provides a converter steelmaking production line, comprising the above-mentioned converter gas storage device 100 .

[0060] Since the converter steelmaking production line includes the above-mentioned converter gas storage device 100, it naturally has all the beneficial effects of the converter gas storage device 100, which will not be described in detail here.

[0061] In some embodiments, the converter steelmaking production line also includes a converter, a cooling tower, a fan, etc. The cooling tower is arranged between the converter and the converter gas storage device 100. The fan transports the gas generated in the converter to the cooling tower for cooling, and then transports it to the converter gas storage device 100 for storage.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0063] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0064] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A converter gas storage device, characterized in that: include: A gas tank (110), wherein the gas tank (110) comprises an inlet pipe (111) for inputting gas; An alkali spraying system (120) is provided with a spraying port (120a), and the spraying port (120a) is arranged in the inlet pipe (111) and is used for spraying alkali solution.

2. The converter gas storage device according to claim 1, characterized in that: The gas cabinet (110) further comprises a partition system (113) arranged in the inlet pipe (111), and the nozzle (120a) is arranged on the front side of the partition system (113) along the flow direction of the gas.

3. The converter gas storage device according to claim 2, characterized in that: The isolation system (113) includes a butterfly valve (1131) and a water seal device (1132).

4. The converter gas storage device according to any one of claims 1 to 3, characterized in that: The alkali spraying system (120) comprises: an alkali solution tank (121) for storing alkali solution; A spray gun (122) having the nozzle (120a); A connecting pipe (123), one end of which is connected to the alkali liquid tank (121), and the other end of which is connected to the spray gun (122); An alkali solution pump (124) is installed on the connecting pipe (123).

5. The converter gas storage device according to claim 4, characterized in that: There are a plurality of spray guns (122), and the plurality of spray guns (122) are arranged at intervals around the circumference of the inlet pipe (111).

6. The converter gas storage device according to claim 4, characterized in that: The gas cabinet (110) further includes a drainer (112), and the converter gas storage device (100) further includes a pH online detector (130) with a detection end arranged in the drainer (112).

7. The converter gas storage device according to claim 6, characterized in that: The alkali spraying system (120) further includes a regulating valve (125) installed on the connecting pipe (123).

8. The converter gas storage device according to claim 7, characterized in that: The gas cabinet (110) further includes a controller (140), wherein the controller (140) is electrically connected to the regulating valve (125) and the pH online detector (130), and the controller (140) adjusts the opening of the regulating valve (125) based on the pH value detected by the pH online detector (130).

9. The converter gas storage device according to claim 8, characterized in that: The controller (140) is also electrically connected to the alkali liquid pump (124); the controller (140) controls the alkali liquid pump (124) to start in response to a start signal of the converter; the controller (140) also controls the alkali liquid pump (124) to stop in response to a stop signal of the converter.

10. A converter steelmaking production line, characterized in that: include: The converter gas storage device (100) according to any one of claims 1 to 9.

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