Oxygen-enriched gas supply stabilizing device and air separation equipment

Abstract

The utility model discloses an oxygen-enriched gas supply stabilizing device and an air separation plant, and relates to the technical field of gas separation, the oxygen-enriched gas supply stabilizing device comprises a kiln, an air purification module and a fractionating tower, the air purification module comprises a first adsorption cylinder and a second adsorption cylinder, the first adsorption cylinder and the second adsorption cylinder are provided with an air inlet path, an air outlet path, an oxygen-enriched gas inlet path and an oxygen-enriched gas outlet path, the oxygen-enriched gas inlet path is communicated with the electric heater, the oxygen-enriched gas outlet path is communicated with the kiln, the air purification module is further provided with a pressure relief branch, one end of the pressure relief branch is communicated with the first adsorption cylinder and the second adsorption cylinder, and the other end of the pressure relief branch is communicated with the atmosphere. The pressure relief branch is provided with a pressure relief valve, the fractionating tower is respectively communicated with the electric heater and the kiln, and a pressure stabilizing valve is arranged on a passage between the fractionating tower and the kiln; according to the technical scheme provided by the utility model, the pressure relief valve is opened, so that the residual high-pressure oxygen-enriched gas in the adsorption barrel is discharged into the atmosphere from the pressure relief branch, thereby ensuring that the pressure in the kiln is stable, and the energy consumption of the environment-friendly induced draft fan is not increased.

Description

Technical Field

[0001] The utility model relates to the technical field of gas separation, in particular to an oxygen-enriched gas supply stabilization device and an air separation device. Background Art

[0002] Air separation units (ASPs) are industrial equipment used to separate air components. They use cryogenic separation technology to separate oxygen, nitrogen, argon, and other rare gases from air. These units typically include key components such as compressors, electric heaters, purification systems, fractionating columns, expanders, and control modules. ASUs are widely used in a variety of fields, including chemical engineering, metallurgy, healthcare, electronics, and food processing, providing essential gas products for modern industrial production. With technological advancements, ASUs are moving towards higher efficiency, lower energy consumption, and more environmentally friendly features to meet growing industrial demands and stringent environmental regulations.

[0003] In traditional industrial gas processing systems, air first passes through an intake filter to remove dust and other mechanical impurities, is then compressed to 0.77 MPa (gauge pressure), cooled to below 40°C in a terminal cooler, and further cooled to 8°C by a refrigeration unit to remove moisture. The air then enters a water separator to separate the moisture, and then passes through a molecular sieve adsorber in the purifier system, which is responsible for removing moisture, acetylene, and carbon dioxide from the air to obtain purified air. To achieve continuous operation, the system is equipped with two molecular sieve adsorbers, which alternate between adsorption and regeneration operations. The regeneration gas used in the regeneration process is a by-product of producing high-purity nitrogen, that is, enriched oxygen containing approximately 60% oxygen. It is heated by an electric heater and used to regenerate the molecular sieve in the adsorption cylinder.

[0004] However, since the adsorption cycle of the adsorption cylinder is 8 hours, each time the adsorption cylinder is switched, the high-pressure air in the cylinder is directly leaked into the oxygen-enriched oxygen delivery pipeline and transported to the kiln, which will cause significant fluctuations in the oxygen-enriched oxygen flow and pressure, thereby affecting the pressure stability of the main line kiln and the operation of the environmental protection induced draft fan, increasing energy consumption and possibly causing environmental protection indicators to exceed standards. Utility Model Content

[0005] The main purpose of the utility model is to propose an oxygen-enriched gas supply stabilization device and an air separation device, aiming to provide an oxygen-enriched gas supply stabilization device that can avoid the pressure increase in the kiln caused by pressure release when switching the adsorption cylinder, thereby reducing the power of the environmentally friendly induced draft fan and reducing energy consumption.

[0006] To achieve the above-mentioned purpose, the oxygen-enriched gas supply stabilization device proposed in the present invention comprises:

[0007] kiln;

[0008] An air purification module, the air purification module comprising a first adsorption cylinder and a second adsorption cylinder, the first adsorption cylinder and the second adsorption cylinder being provided with an air inlet, an air outlet, an oxygen-enriched oxygen inlet, and an oxygen-enriched oxygen outlet, the oxygen-enriched oxygen inlet being connected to an electric heater, the oxygen-enriched oxygen outlet being connected to the kiln, the air purification module being further provided with a pressure relief branch, one end of the pressure relief branch being respectively connected to the first adsorption cylinder and the second adsorption cylinder, and the other end being connected to the atmosphere, the pressure relief branch being provided with a pressure relief valve; and

[0009] A fractionating tower is connected to the electric heater and the kiln respectively. A pressure-stabilizing valve is provided on the passage between the fractionating tower and the kiln, and the pressure-stabilizing valve is used to adjust the air intake of the fractionating tower.

[0010] In one embodiment, the oxygen-rich gas supply stabilization device further includes a PLC electronic control module, and the PLC electronic control module is electrically connected to the pressure relief valve and the pressure stabilizing valve respectively.

[0011] In one embodiment, the air purification module further includes a bridging branch, the bridging branch connecting the pressure relief branch and the oxygen-enriched gas outlet, and the bridging branch is provided with a check valve.

[0012] In one embodiment, a first valve body and a second valve body are respectively provided on the passage of the pressure relief branch connecting the first adsorption cylinder and the second adsorption cylinder.

[0013] In one embodiment, the air purification module further includes a pressure equalizing circuit, the pressure equalizing circuit is connected to the first adsorption cylinder and the second adsorption cylinder respectively, and the pressure equalizing circuit is provided with a pressure equalizing valve.

[0014] In one embodiment, a third valve body and a fourth valve body are respectively provided on the passage of the air inlet passage connecting the first adsorption cylinder and the second adsorption cylinder.

[0015] In one embodiment, a fifth valve body and a sixth valve body are respectively provided on the passage where the air outlet communicates with the first adsorption cylinder and the second adsorption cylinder.

[0016] In one embodiment, a seventh valve body and an eighth valve body are respectively provided on the passage connecting the oxygen-enriched gas inlet to the first adsorption cylinder and the second adsorption cylinder.

[0017] In one embodiment, two electric heaters are provided, and the two electric heaters are connected in parallel.

[0018] The utility model also provides an air separation device, which includes the oxygen-enriched gas supply stabilization device as described above.

[0019] The technical solution of the present invention proposes an oxygen-enriched gas supply stabilization device and an air separation device, wherein the oxygen-enriched gas supply stabilization device includes a kiln, an air purification module and a distillation tower, the air purification module includes a first adsorption cylinder and a second adsorption cylinder, the first adsorption cylinder and the second adsorption cylinder are provided with an air inlet, an air outlet, an oxygen-enriched gas inlet and an oxygen-enriched gas outlet, the oxygen-enriched gas inlet is connected to the electric heater, and the pressure relief branch is connected to the first adsorption cylinder and the second adsorption cylinder respectively. When it is necessary to switch the adsorption cylinder operation, the pressure relief valve is controlled to open so that the high-pressure oxygen-enriched gas remaining in the adsorption cylinder is discharged from the pressure relief branch to the atmosphere instead of to the kiln. During the pressure relief process of the pressure relief branch, the pressure stabilizing valve will open and transmit the oxygen-enriched gas generated in the distillation tower to the kiln, thereby ensuring the stability of the pressure in the kiln, and the normal operation of the environmental protection induced draft fan will not cause an increase in energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0021] Figure 1 This is a structural diagram of an embodiment of an oxygen-enriched gas supply stabilization device provided by the present invention;

[0022] Figure 2 for Figure 1 A partial enlarged view of the air purification module.

[0023] Description of Figure Numbers:

[0024] 1000. Oxygen-enriched gas supply stabilization device; 1. Kiln; 2. Air purification module; 21. First adsorption cylinder; 22. Second adsorption cylinder; 23. Air inlet; 231. Third valve body; 232. Fourth valve body; 233. Ninth valve body; 234. Tenth valve body; 24. Air outlet; 241. Fifth valve body; 242. Sixth valve body; 25. Oxygen-enriched gas inlet; 251. Seventh valve body; 252. Eighth valve body; 26. Bridging branch; 27. Pressure relief branch; 271. Pressure relief valve; 272. Check valve; 28. Pressure equalizing circuit; 281. Pressure equalizing valve; 3. Distillation tower; 4. Pressure stabilizing valve; 5. PLC electronic control module; 6. Electric heater.

[0025] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0027] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. 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 the present invention.

[0029] The utility model proposes an oxygen-enriched gas supply stabilization device, which aims to provide an oxygen-enriched gas supply stabilization device that can avoid the pressure increase in the kiln caused by pressure release when switching the adsorption cylinder, thereby reducing the power of the environmentally friendly induced draft fan and reducing energy consumption. Figures 1 to 2 This is a structural diagram of an embodiment of the oxygen-enriched gas supply stabilization device provided by the present invention.

[0030] Please refer to Figures 1 to 2The utility model proposes an oxygen-enriched gas supply stabilization device 1000, including a kiln 1, an air purification module 2 and a distillation tower 3. The air purification module 2 includes a first adsorption cylinder 21 and a second adsorption cylinder 22. The first adsorption cylinder 21 and the second adsorption cylinder 22 are provided with an air inlet 23, an air outlet 24, an oxygen-enriched gas inlet 25 and an oxygen-enriched gas outlet. The oxygen-enriched gas inlet 25 is connected to the electric heater 6, and the oxygen-enriched gas outlet is connected to the kiln 1. The air purification module 2 is also provided with a pressure relief branch 27, one end of the pressure relief branch 27 is respectively connected to the first adsorption cylinder 21 and the second adsorption cylinder 22, and the other end is connected to the atmosphere. The pressure relief branch 27 is provided with a pressure relief valve 271. The distillation tower 3 is respectively connected to the electric heater 6 and the kiln 1, and a pressure stabilizing valve 4 is provided on the passage between the distillation tower 3 and the kiln 1.

[0031] The oxygen-enriched gas supply stabilization device 1000 proposed in the present invention realizes the switching of the adsorption cylinder by the following process:

[0032] Since the adsorption cycle of the adsorption cylinder is 8 hours, the adsorption cylinder needs to be switched after 8 hours. Taking the use of the first adsorption cylinder 21 for adsorption and then the second adsorption cylinder 22 for adsorption as an example, when the first adsorption cylinder 21 is performing adsorption purification operations, the first valve body and the second valve body are both closed, and there is no need to release pressure to the outside atmosphere at this time; the third valve body 231 is opened, the fourth valve body 232 is closed, and air enters the first adsorption cylinder 21; after purification by the adsorption cylinder, the fifth valve body 241 is opened, the sixth valve body 242 is closed, and the air that has completed adsorption purification enters the next process of the air separation equipment; in this process, the oxygen-rich gas generated from the distillation tower 3 will be heated in the electric heater 6 and then enter the first adsorption cylinder 21 through the seventh valve body 251 for regeneration, the seventh valve body 251 is opened, and the eighth valve body 252 is closed; the regenerated oxygen-rich gas enters the kiln 1 from the oxygen-rich gas outlet to assist in combustion, the ninth valve body 233 is opened, and the tenth valve body 234 is closed.

[0033] During the switching process, the pressure relief valve 271 is opened, and the high-pressure oxygen-rich gas in the first adsorption cylinder 21 is discharged to the atmosphere, the first valve body is opened, the second valve body is closed, the third valve body 231 is closed, the fourth valve body 232 is opened, the fifth valve body 241 is closed, the sixth valve body 242 is opened, the seventh valve body 251 is closed, and the eighth valve body 252 is opened. The air and the oxygen-rich gas generated by the distillation tower 3 all enter the second adsorption cylinder 22 to realize the switching of the adsorption cylinders.

[0034] The technical solution of the present invention proposes an oxygen-enriched gas supply stabilization device 1000 and an air separation device, wherein the oxygen-enriched gas supply stabilization device 1000 includes a kiln 1, an air purification module 2 and a distillation tower 3, the air purification module 2 includes a first adsorption cylinder 21 and a second adsorption cylinder 22, the first adsorption cylinder 21 and the second adsorption cylinder 22 are provided with an air inlet 23, an air outlet 24, an oxygen-enriched gas inlet 25 and an oxygen-enriched gas outlet, the oxygen-enriched gas inlet 25 is connected to the electric heater 6, and the pressure relief branch 27 is connected to the first adsorption cylinder 21 and the second adsorption cylinder 22 respectively. When it is necessary to switch the adsorption cylinder operation, the pressure relief valve 271 is controlled to open so that the high-pressure oxygen-enriched gas remaining in the adsorption cylinder is discharged from the pressure relief branch 27 to the atmosphere instead of to the kiln 1. During the pressure relief process of the pressure relief branch 27, the pressure stabilizing valve 4 will open and transmit the oxygen-enriched gas generated in the distillation tower 3 to the kiln 1, thereby ensuring the pressure stability in the kiln 1, and the normal operation of the environmental protection draft fan will not cause an increase in energy consumption.

[0035] In order to carry out intelligent control of the air separation equipment to achieve more scientific management, the oxygen-enriched gas supply stabilization device 1000 also includes a PLC electronic control module. For details, please refer to Figure 1 The PLC electronic control module is electrically connected to the pressure relief valve 271 and the pressure regulating valve 4, respectively. The PLC electronic control module plays a core control role in the aforementioned oxygen-enriched gas supply stabilization device 1000. Through its electrical connection to the pressure relief valve 271 and the pressure regulating valve 4, it automatically regulates and manages the entire system. The PLC module automatically controls the opening and closing of the pressure regulating valve 4, as well as the gas flow rate per unit time, based on input signals (such as pressure, flow, and other parameters). This ensures that the system safely and quickly releases pressure to the atmosphere when switching adsorption cylinders or performing pressure relief operations. It also maintains the stability of the kiln pressure within the kiln 1 and allows the oxygen-enriched gas generated in the fractionation tower 3 to be transported to the kiln 1, thereby avoiding pressure buildup and affecting the oxygen-enriched gas flow rate. Furthermore, the PLC module maintains a stable intake volume to the fractionation tower 3, ensuring a continuous and stable oxygen-enriched gas supply and reducing pressure fluctuations during kiln 1 operations. Through this precise control, the PLC electronic control module helps improve the efficiency and safety of the entire gas supply system, reduce energy consumption, and ensure compliance with environmental standards.

[0036] In the embodiment of the present invention, the air purification module 2 includes a bridge branch 26, which connects the pressure relief branch 27 and the oxygen-enriched gas outlet. This arrangement allows the oxygen-enriched gas regenerated from the adsorption cylinder to enter the kiln 1 from the oxygen-enriched gas outlet through the bridge branch 26 to assist combustion. Furthermore, the bridge branch 26 is provided with a check valve 272. For details, please refer to Figure 2 When the first adsorption cylinder 21 or the second adsorption cylinder 22 transports oxygen-enriched gas into the kiln 1, the check valve 272 is always in a closed state, thereby preventing the oxygen-enriched gas from leaking from the oxygen-enriched gas outlet through the bridging branch 26 to the pressure relief branch 27 into the atmosphere.

[0037] In order to keep the pressure of the first adsorption cylinder 21 and the second adsorption cylinder 22 consistent after switching, the air purification module 2 also includes a pressure equalizing circuit 28. By opening the pressure equalizing valve 281 on the pressure equalizing circuit 28, the air pressure of the first adsorption cylinder 21 and the air pressure of the second adsorption cylinder 22 can be quickly balanced. When one adsorption cylinder completes the adsorption work and needs to be regenerated, the other adsorption cylinder continues to adsorb. The pressure equalizing valve 281, by adjusting the pressure between the two adsorption cylinders, ensures that the pressure fluctuations of the system are minimized during the switching process, thereby ensuring the continuity and stability of the entire air separation process. This can effectively avoid system instability caused by sudden pressure changes, reduce the impact on the performance of the air separation plant, and ensure the safe and efficient operation of the air separation plant.

[0038] In one embodiment of the present invention, two electric heaters 6 are provided. The main advantage of providing two electric heaters 6 in an air separation unit is that they can serve as backup for each other, thereby improving the reliability and stability of the system. When one electric heater 6 is undergoing maintenance or malfunctioning, the other can continue to operate, ensuring that the regeneration process of the molecular sieve adsorber is not interrupted, thereby ensuring the continuous and stable operation of the air separation unit. In addition, the two electric heaters 6 can be used alternately, which can avoid overheating and excessive wear caused by the long-term operation of a single electric heater 6, extend the service life of the equipment, and improve the safety of the entire system. At the same time, this configuration can also be flexibly adjusted under different operating conditions to optimize energy consumption and operating efficiency.

[0039] The present invention also proposes an air separation device, which includes an oxygen-rich gas supply stabilization device 1000. The specific structure of the oxygen-rich gas supply stabilization device 1000 refers to the above embodiment. Since this air separation device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0040] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An oxygen-enriched gas supply stabilization device, characterized in that: include: kiln; An air purification module, the air purification module includes a first adsorption cylinder and a second adsorption cylinder, the first adsorption cylinder and the second adsorption cylinder are provided with an air inlet, an air outlet, an oxygen-enriched oxygen inlet, and an oxygen-enriched oxygen outlet, the oxygen-enriched oxygen inlet is connected to an electric heater, and the oxygen-enriched oxygen outlet is connected to the kiln, the air purification module is further provided with a pressure relief branch, one end of the pressure relief branch is respectively connected to the first adsorption cylinder and the second adsorption cylinder, and the other end is connected to the atmosphere, and the pressure relief branch is provided with a pressure relief valve; as well as A fractionating tower is connected to the electric heater and the kiln respectively. A pressure-stabilizing valve is provided on the passage between the fractionating tower and the kiln, and the pressure-stabilizing valve is used to adjust the air intake of the fractionating tower.

2. The oxygen-enriched gas supply stabilization device according to claim 1, characterized in that: The oxygen-rich gas supply stabilization device further includes a PLC electronic control module, which is electrically connected to the pressure relief valve and the pressure stabilizing valve respectively.

3. The oxygen-enriched gas supply stabilization device according to claim 2, characterized in that: The air purification module further includes a bridging branch, which connects the pressure relief branch and the oxygen-enriched gas outlet, and the bridging branch is provided with a check valve.

4. The oxygen-enriched gas supply stabilization device according to any one of claims 1 to 3, characterized in that: A first valve body and a second valve body are respectively provided on the passage of the pressure relief branch connecting the first adsorption cylinder and the second adsorption cylinder.

5. The oxygen-enriched gas supply stabilization device according to any one of claims 1 to 3, characterized in that: The air purification module further includes a pressure equalizing circuit, which is connected to the first adsorption cylinder and the second adsorption cylinder respectively, and the pressure equalizing circuit is provided with a pressure equalizing valve.

6. The oxygen-enriched gas supply stabilization device according to any one of claims 1 to 3, characterized in that: A third valve body and a fourth valve body are respectively provided on the passage where the air inlet communicates with the first adsorption cylinder and the second adsorption cylinder.

7. The oxygen-enriched gas supply stabilization device according to any one of claims 1 to 3, characterized in that: A fifth valve body and a sixth valve body are respectively provided on the passage where the air outlet communicates with the first adsorption cylinder and the second adsorption cylinder.

8. The oxygen-enriched gas supply stabilization device according to any one of claims 1 to 3, characterized in that: A seventh valve body and an eighth valve body are respectively provided on the passage where the oxygen-enriched gas inlet communicates with the first adsorption cylinder and the second adsorption cylinder.

9. The oxygen-enriched gas supply stabilization device according to any one of claims 1 to 3, characterized in that: There are two electric heaters, which are connected in parallel.

10. An air separation plant, characterized in that: The device comprises the oxygen-rich gas supply stabilization device according to any one of claims 1 to 9.

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