Nitrogen distribution loop for ultra-pure helium extraction adsorber optimization device

Abstract

The utility model discloses a kind of nitrogen distribution ring pipe optimization devices of ultrapure helium extraction adsorber, it is related to gas production equipment technical field, it includes adsorber and nitrogen distribution ring pipe, adsorber has multiple branch series beam tube, and each beam tube outside is provided with independent sleeve, the top of adsorber is provided with nitrogen distribution ring pipe, and multiple exhaust holes are arranged on nitrogen distribution ring pipe.The utility model solves the problem that the nitrogen distribution ring pipe of the top of existing ultrapure helium double-layer metal wall vacuum heat-insulated container adsorber is closed, and the nitrogen at top cannot normally circulate.

Description

Technical Field

[0001] This utility model relates to the field of gas production equipment technology, and in particular to an optimization device for nitrogen distribution loop in an ultrapure helium extraction adsorber. Background Technology

[0002] With the rapid development of my country's economy, the domestic demand for ultrapure helium has been increasing year by year. Especially in national strategic industries such as military, scientific research, petrochemical, refrigeration, medical, semiconductor, pipeline leak detection, superconducting testing, metal manufacturing, deep-sea diving, high-precision welding, and optoelectronic product manufacturing, the purity requirements for ultrapure helium are extremely stringent.

[0003] The key to producing ultrapure helium lies in effectively removing impurities such as neon to improve helium purity and meet the high standards required by various industries. The current adsorption-based neon removal process for extracting ultrapure helium is as follows: 1. Adsorber Adsorption. The gas from the top of the vapor-liquid separator of the neon-helium separation system (containing 16% neon and 84% helium) is reheated in a heat exchanger, cooled in the heat exchanger, and then sent to the adsorption neon removal system. The neon component is removed by the adsorption of the neon remover. The adsorbed ultrapure helium is cooled to room temperature by the heat exchanger, and then pressurized by the membrane compressor and fed into the gas cylinder to obtain the ultrapure helium product.

[0004] 2. Adsorber regeneration. After the two neon-removing adsors are connected in parallel, the original adsorber begins to slowly depressurize. After the pressure drops to atmospheric pressure, the double-walled vacuum insulated container begins to drain the liquid. Once there is no liquid level display, the adsorber is automatically switched through a cycle of heating, cold blowing, liquid injection, and pressure equalization.

[0005] The existing ultrapure helium extraction and adsorption neon removal system includes a neon-helium separation system where gas is split into two inlet pipes, each connected to a solenoid valve, before entering the neon-removing adsorber. A double-walled, vacuum-insulated container has a bottom inlet and replenishment pipe connected to a lower inlet valve and an upper replenishment valve, respectively. A vacuum pipe branches off before the exhaust valve on the upper exhaust pipe, which is connected to a solenoid valve and then to a vacuum pump unit. A regeneration heating pipe, connected to an electric heater, extends into the vacuum-insulated container via a solenoid valve. The adsorber is located inside the double-walled, vacuum-insulated container, and a safety valve vents the top vent pipe. The drawback of this process is that the nitrogen distribution ring at the top of the adsorber is closed, preventing normal nitrogen flow. This leads to uneven heating and poor desorption during regeneration, resulting in unstable production conditions and poor ultrapure helium production, forcing a reduction in production load. Utility Model Content

[0006] The purpose of this invention is to provide an optimized nitrogen distribution loop device for an ultrapure helium extraction adsorber. This device can solve the problem that the nitrogen distribution loop at the top of the existing ultrapure helium double-walled metal vacuum insulated container adsorber is closed, preventing normal flow of nitrogen at the top.

[0007] To solve the above problems, the technical solution adopted by this utility model is as follows: This ultrapure helium extraction adsorber nitrogen distribution loop optimization device includes an adsorber and a nitrogen distribution loop. The adsorber has multiple bundles of tubes connected in series, and each bundle of tubes is provided with an independent sleeve. The nitrogen distribution loop is provided on the top of the adsorber, and multiple exhaust holes are opened on the nitrogen distribution loop.

[0008] In the above-mentioned technical solution of the nitrogen distribution loop optimization device for ultrapure helium extraction adsorber, a more specific technical solution may be: multiple exhaust holes are evenly distributed on the nitrogen distribution loop.

[0009] In some possible implementations, the nitrogen distribution ring pipe has three exhaust holes arranged in an equilateral triangle.

[0010] In some possible implementations, the adsorber is entirely immersed in a double-walled vacuum insulated container; an inlet is provided at the bottom of the sleeve, and the top of each sleeve is connected in parallel to the nitrogen distribution ring pipe through a sleeve nitrogen collection pipe.

[0011] In some possible implementations, the device is provided with one or two nitrogen distribution ring pipes for backup.

[0012] In some possible implementations, the bundle tubes are connected in series via bundle tube connecting tubes.

[0013] In some possible implementations, the adsorber is provided with nine of the aforementioned bundles of tubes.

[0014] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art: 1. By opening multiple exhaust holes on the nitrogen distribution ring pipe, the original closed structure is broken, allowing the nitrogen accumulated in the ring pipe and top to be discharged smoothly. This directly ensures the smooth flow of gas inside the adsorber, laying the foundation for subsequent uniform liquid replenishment and efficient regeneration.

[0015] 2. Multiple exhaust holes are evenly distributed on the nitrogen distribution ring pipe, ensuring that nitrogen can be discharged uniformly and without dead angles from all directions of the ring pipe, avoiding local airflow congestion, thereby ensuring the balance of the pressure field at the top of the entire adsorber and further improving the stability of the system operation.

[0016] 3. The three exhaust ports are arranged in an equilateral triangle to optimally cover the annular pipe, preventing gas flow deviation to the greatest extent and ensuring uniform airflow distribution and heat transfer. This is crucial for uniform heating and desorption in the subsequent regeneration stage.

[0017] 4. The adsorber is fully immersed in an insulated container, and the structure with liquid inlet at the bottom of the sleeve and top connected to the nitrogen distribution ring via a manifold ensures that during liquid replenishment, the displaced nitrogen can be smoothly discharged from the vent of the ring through the manifold. The liquid can quickly and completely fill the entire volume of the sleeve without leaving any gas pockets, which is crucial for ensuring the efficiency and uniformity of subsequent process stages. At the same time, the unobstructed gas path provides a prerequisite for uniform heating and cooling during the regeneration stage, directly improving the problems of "uneven heating and poor desorption effect". The filled liquid, as an excellent heat transfer medium, achieves uniform heating and cooling of the adsorber bundle tubes during the regeneration stage, greatly improving the desorption effect.

[0018] 5. The installation of two nitrogen distribution loops, one for backup and one for use, improves the reliability and continuity of the entire ultrapure helium production system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the nitrogen distribution loop optimization device for the ultrapure helium extraction adsorber.

[0020] Figure 2 This is a schematic diagram of an ultrapure helium extraction system.

[0021] Explanation of reference numerals in the attached diagram: 1. Adsorber; 2. Inlet pipe; 3. Ultrapure helium outlet pipe; 4. Liquid inlet; 5. Sheath; 6. Bundle tube; 7. Nitrogen collection pipe of the sheath; 8. Bundle tube connecting pipe; 9. Nitrogen distribution ring pipe; 10. Exhaust port. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments: Figure 1 and Figure 2 The ultrapure helium extraction adsorber nitrogen distribution loop optimization device shown mainly includes an adsorber 1 and a nitrogen distribution loop 9. The main body of the adsorber 1 is composed of multiple bundled tubes 6 connected in series. Each bundled tube 6 is equipped with an independent sleeve 5. The adsorber 1 is immersed in a double-walled vacuum insulated container to achieve good insulation. The raw material gas from the neon-helium separation system enters the device through the inlet pipe 2, while the purified ultrapure helium is output to the subsequent system through the ultrapure helium outlet pipe 3. A nitrogen distribution loop 9 is set at the top of the adsorber 1 for uniform distribution and collection of nitrogen. Each sleeve 5 has a liquid inlet 4 at the bottom and is connected in parallel to the nitrogen distribution loop 9 through a sleeve nitrogen collecting pipe 7 at the top, forming a complete nitrogen flow path.

[0023] To further optimize nitrogen distribution, multiple vent holes 10 are provided on the nitrogen distribution ring pipe 9, and these vent holes 10 are evenly arranged along the ring pipe. In one specific embodiment, the adsorber 1 consists of nine bundled tubes 6 connected in series, each bundled tube 6 having an independent sleeve 5. The bundled tubes 6 are connected in series through bundled tube connecting pipes 8. The nitrogen distribution ring pipe 9 has three vent holes 10 arranged in an equilateral triangle. This arrangement helps prevent gas flow deviation within the nitrogen distribution ring pipe 9, ensuring the uniformity and stability of nitrogen flow. In addition, the device is equipped with two nitrogen distribution ring pipes 9, one for standby and one for backup. When one ring pipe needs maintenance or becomes blocked, it can be quickly switched to the backup ring pipe, thereby ensuring continuous and stable production. This is a key measure to achieve efficient and full-load operation.

[0024] During system operation, the gas from the neon-helium separation system is split into two inlet pipes, each connected to a solenoid valve (V2601 / V2606) before entering the neon removal adsorber. After the inlet solenoid valve (V2601 / V2606), the adsorber depressurized waste gas returns to the gas bladder. The bottom liquid inlet and replenishment pipes of the double-walled metal vacuum insulated container are respectively connected to the lower liquid inlet valve (V2608 / V2609) and the upper replenishment valve (V2610 / V2611). The upper exhaust pipe exhaust valve (V2628 / V2629) branches into a vacuum pipe. The vacuum pipe is connected to a solenoid valve (V2632 / V2633) and then to a vacuum pump unit. The regeneration heating pipe is connected to an electric heater and extends into the vacuum insulated container through a solenoid valve (V2616 / V2617). The top vent pipe of the double-walled metal vacuum insulated container has a safety valve for venting to ensure system safety.

[0025] This invention optimizes the structure of the nitrogen distribution ring pipe, particularly by incorporating three equilateral triangularly distributed exhaust holes. This effectively improves the flow characteristics of nitrogen, prevents gas deviation, and ensures normal nitrogen circulation. It effectively solves problems in existing ultrapure helium extraction systems, such as the inability to replenish the adsorber properly, uneven heating during regeneration, poor desorption, fluctuating production conditions, and low purity of helium products. This results in efficient, stable, and full-load production of ultrapure helium.

Claims

1. A nitrogen distribution loop optimization device for an ultrapure helium extraction adsorber, comprising an adsorber and a nitrogen distribution loop, wherein the adsorber has multiple bundles of tubes connected in series, each bundle of tubes is provided with an independent sleeve, and the nitrogen distribution loop is provided at the top of the adsorber, characterized in that: The nitrogen distribution ring pipe has multiple exhaust holes.

2. The nitrogen distribution loop optimization device for the ultrapure helium extraction adsorber according to claim 1, characterized in that: Multiple exhaust holes are evenly distributed on the nitrogen distribution ring pipe.

3. The nitrogen distribution loop optimization device for the ultrapure helium extraction adsorber according to claim 2, characterized in that: The nitrogen distribution ring pipe has three exhaust holes arranged in an equilateral triangle.

4. The nitrogen distribution loop optimization device for the ultrapure helium extraction adsorber according to claim 3, characterized in that: The adsorber is completely immersed in a double-walled vacuum insulated container; an inlet is provided at the bottom of the sleeve, and the top of each sleeve is connected in parallel to the nitrogen distribution ring pipe through a sleeve nitrogen collection pipe.

5. The nitrogen distribution loop optimization device for the ultrapure helium extraction adsorber according to any one of claims 1 to 4, characterized in that: The device is equipped with two nitrogen distribution ring pipes, one for backup and one for standby.

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