Naked cooling device of cryogenic oxygen generator

Abstract

The utility model relates to the technical field of oxygen production of steel mills, in particular to a naked cooling device of a cryogenic oxygen generator. Comprising an air filter, an air compressor communicated with the air filter, an air cooling tower communicated with the air compressor, a water cooling tower communicated with the air cooling tower, a first molecular sieve and a second molecular sieve which are communicated with the air cooling tower, and a plate heat exchanger communicated with the first molecular sieve, the expansion machine and the expansion machine. Therefore, the bare cooling device of the cryogenic oxygen generator can solve the technical problems that the blow-off process of a traditional cryogenic oxygen generator mainly depends on air compression of an air compressor, and the process is extremely high in energy consumption and long in consumed time.

Description

Technical Field

[0001] This application relates to the field of oxygen production technology in steel plants, and more specifically, to a device for bare cooling of a cryogenic oxygen generator. Background Technology

[0002] In the installation and operation of cryogenic oxygen generators, purging and bare cooling are indispensable key steps. However, existing technologies still have many problems and shortcomings in this field.

[0003] Traditional cryogenic oxygen generators rely primarily on compressed air from an air compressor for purging, a process that is extremely energy-intensive and time-consuming. Purging requires a specific procedure, including blowing away external equipment and piping, as well as internal equipment; the entire process is cumbersome and inefficient. More seriously, if the purging gas is not dried, moisture may saturate and precipitate upon contact with cold equipment, potentially freezing and damaging pipes and equipment. Furthermore, residual humid gas inside the equipment after purging is highly susceptible to condensation when the temperature changes, posing a potential threat to the equipment.

[0004] Bare cooling, a necessary step after installation and start-up, also presents significant problems. The bare cooling process consumes a large amount of electricity without producing any product, resulting in energy waste. Furthermore, bare cooling requires time to inspect for pipe deformation, pipe support deformation, cryogenic valves, flanges, and welds, and to re-check for leaks and tighten internal flanges and connections of the cold box, making the entire process time-consuming. This inefficient bare cooling method not only increases time costs but also affects the overall efficiency of the oxygen production process.

[0005] The existing cryogenic oxygen generator has a cumbersome oxygen production process. From equipment and pipeline purging and bare cooling to hot start-up oxygen production, each step is time-consuming, which seriously affects the project schedule. At the same time, the air compressor, as an important piece of equipment in air separation oxygen production, has a long manufacturing and installation cycle, and the inability of a single unit to operate restricts the next process, resulting in inefficient overall resource utilization. Utility Model Content

[0006] Based on the above problems, this application proposes a device for bare cooling of a cryogenic oxygen generator, which solves the technical problem that the purging process of traditional cryogenic oxygen generators mainly relies on compressed air from an air compressor, a process that is extremely energy-intensive and time-consuming.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0008] A device for bare cooling of a cryogenic oxygen generator includes an air filter, an air compressor connected to the air filter, an air-cooled tower connected to the air compressor, a water-cooled tower connected to the air-cooled tower, a first molecular sieve and a second molecular sieve connected to the air-cooled tower, an expander connected to the first molecular sieve and the second molecular sieve, and a plate heat exchanger connected to the expander.

[0009] In one specific implementation, a first valve is provided between the air compressor and the air-cooled tower.

[0010] In one specific implementation, an oxygen sphere is connected between the first valve and the air-cooled tower, and a second valve is provided between the oxygen sphere and the first valve.

[0011] In one specific implementation scheme, both the air-cooled tower and the water-cooled tower are connected to a water supply station, the air-cooled tower and the water-cooled tower are interconnected, a chilling pump is installed between the air-cooled tower and the water-cooled tower, and a cooling pump is installed between the air-cooled tower and the water supply station.

[0012] In one specific implementation, the first molecular sieve and the second molecular sieve are connected.

[0013] In one specific implementation, the expander is provided with an expansion end and a pressurization end.

[0014] The positive effects of this utility model are:

[0015] By optimizing the purging and bare cooling processes, and using nitrogen generated by the air compressor of the adjacent air separation production line as the purging gas source, the purging and packing of equipment pipelines can be completed in advance, saving the compression energy of the air compressor when purging equipment pipelines.

[0016] Directly performing the bare cooling stage reduces the air compressor's operating time and lowers energy consumption.

[0017] Using dry, high-pressure nitrogen for purging avoids the problem of moisture freezing inside the equipment caused by humid air, protecting the safety of the equipment and pipelines, while also improving purging efficiency.

[0018] Using dry nitrogen for purging effectively avoids the risk of equipment damage caused by humid air during traditional purging processes. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Explanation of reference numerals in the attached figures

[0022] 1. Air filter; 2. Air compressor; 3. Air-cooled tower; 4. Water-cooled tower; 5. First molecular sieve; 6. Second molecular sieve; 7. Expander; 8. Plate heat exchanger; 9. First valve; 10. Second valve; 11. Oxygen tank; 12. Water supply station; 13. Refrigeration pump; 14. Cooling pump. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] Example

[0025] like Figure 1 As shown, the cryogenic oxygen generator bare cooling device in this embodiment includes an air filter 1, an air compressor 2, an air-cooled tower 3, a water-cooled tower 4, a first molecular sieve 5, a second molecular sieve 6, an expander 7, and a plate heat exchanger 8, wherein:

[0026] A device for bare cooling of a cryogenic oxygen generator includes an air filter 1, an air compressor 2 connected to the air filter 1, an air-cooled tower 3 connected to the air compressor 2, a water-cooled tower 4 connected to the air-cooled tower 3, a first molecular sieve 5 and a second molecular sieve 6 connected to the air-cooled tower 3, an expander 7 connected to the first molecular sieve 5 and the second molecular sieve 6, and a plate heat exchanger 8 connected to the expander 7. The expander 7 is provided with an expansion end and a pressurization end.

[0027] The first molecular sieve 5 and the second molecular sieve 6 are connected in parallel.

[0028] A first valve 9 is provided between the air compressor 2 and the air-cooled tower 3. An oxygen tank 11 is connected between the first valve 9 and the air-cooled tower 3. A second valve 10 is provided between the oxygen tank 11 and the first valve 9.

[0029] Both the air-cooled tower 3 and the water-cooled tower 4 are connected to a water supply station 12. The air-cooled tower 3 and the water-cooled tower 4 are connected to each other. A chilled pump 13 is installed between the air-cooled tower 3 and the water-cooled tower 4. A cooling pump 14 is installed between the air-cooled tower 3 and the water supply station 12.

[0030] Purging phase:

[0031] Close the outlet valve of air compressor 2.

[0032] Open the purging valve of the pre-purging mechanism, and high-pressure nitrogen gas will enter the production line to purge the equipment and pipelines.

[0033] During the purging process, the flow rate of high-pressure nitrogen should be no less than 20 m / s to ensure the purging effect.

[0034] The dew point detector is monitored, and when the dew point is below -60°C, the working conditions are considered met. At this point, the purging valve is closed.

[0035] By optimizing the purging and bare cooling process, and using the nitrogen generated by the air compressor 2 of the adjacent air separation production line as the purging gas source, the purging of equipment pipelines and the filling of packing can be completed in advance, saving the compression power of air compressor 2 when purging equipment pipelines.

[0036] By completing the purging and filling work in advance, this embodiment can save the operating time after the air compressor 2 is installed, shortening the construction period by approximately 5-7 days. Using high-pressure nitrogen for purging reduces the energy consumption of purging the production line after the air compressor 2 is installed, thus lowering costs. Throughout the purging and bare cooling process, energy consumption is further reduced by optimizing gas flow and cooling circulation.

[0037] During the hot start-up oxygen production stage, liquid oxygen in the storage tank is used to accelerate the rise of the liquid oxygen level in the main cooling tank, effectively shortening the liquid level accumulation time by approximately 18 hours and improving overall efficiency. Through a pre-purging mechanism and an optimized purging process, purging efficiency is improved, further shortening the overall oxygen production process cycle.

[0038] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0039] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for bare cooling of a cryogenic oxygen generator, characterized in that, It includes an air filter (1), an air compressor (2) connected to the air filter (1), an air-cooled tower (3) connected to the air compressor (2), a water-cooled tower (4) connected to the air-cooled tower (3), a first molecular sieve (5) and a second molecular sieve (6) connected to the air-cooled tower (3), an expander (7) connected to the first molecular sieve (5) and the second molecular sieve (6), and a plate heat exchanger (8) connected to the expander (7).

2. The device for bare cooling of a cryogenic oxygen generator according to claim 1, characterized in that, A first valve (9) is provided between the air compressor (2) and the air-cooled tower (3).

3. The device for bare cooling of a cryogenic oxygen generator according to claim 2, characterized in that, An oxygen tank (11) is connected between the first valve (9) and the air-cooled tower (3), and a second valve (10) is provided between the oxygen tank (11) and the first valve (9).

4. The device for bare cooling of a cryogenic oxygen generator according to claim 1, characterized in that, Both the air-cooled tower (3) and the water-cooled tower (4) are connected to a water supply station (12). The air-cooled tower (3) and the water-cooled tower (4) are connected to each other. A chilled pump (13) is installed between the air-cooled tower (3) and the water-cooled tower (4). A cooling pump (14) is installed between the air-cooled tower (3) and the water supply station (12).

5. The device for bare cooling of a cryogenic oxygen generator according to claim 1, characterized in that, The first molecular sieve (5) and the second molecular sieve (6) are connected.

6. The device for bare cooling of a cryogenic oxygen generator according to claim 1, characterized in that, The expander (7) is provided with an expansion end and a pressurization end.

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