CN219682125U - Isobaric nondestructive regeneration control structure of nitrogen purification system - Google Patents

Abstract

The utility model relates to the field of refined nitrogen, in particular to a nitrogen purification system isobaric lossless regeneration control structure. The nitrogen source is connected to one end of the valve KV105B, one end of the valve KV106B, one end of the V50, the valve KV101A and the valve KV101B through the valve V40. Port A of the pipeline and the other end of the valve V50 are connected to the pre-drying tower. The outlet of the pre-drying tower is connected to one end of the valve KV106A and one end of the valve KV105A respectively. There is an F port between the valve KV106A and the valve KV106B. The valve KV105A is connected to the valve KV106B. There is an E port between KV105B, D port is connected to the product pipeline through valve V60, C port is connected to F port; B port is connected to E port through the pipeline. The advantage of this utility model is that it solves the problem of equal pressure between adsorption and regeneration pressure in regenerated nitrogen, and can achieve the quality indicators of dew point <‑60°C and trace oxygen <5PPm in refined nitrogen products.

Description

A nitrogen purification system isobaric lossless regeneration control structure

Technical field

The utility model relates to the technical field of purified nitrogen, and in particular to an isobaric lossless regeneration control structure of a nitrogen purification system.

Background technique

High-purity nitrogen is particularly important as a protective gas medium for cold-rolled galvanizing production. The oxygen content and dew point indicators are particularly important. The oxygen content of air-separated nitrogen can currently reach <5PPm indicators, but the dew point is still between -40~-55℃ and cannot meet the cold rolling <- 60℃ target requirement. The nitrogen purification and refining process is to use hydrodeoxygenation technology to remove trace oxygen from the nitrogen, and then remove the moisture through deep drying, and finally obtain high-purity refined nitrogen with an oxygen content of <5PPm and a dew point of <-60°C for cold rolling and galvanizing. The process uses protective gas. The packing tower of the existing nitrogen refining and purification unit adopts a double-tower process, as shown in Figure 1. One tower (drying tower A) is working and the other tower (drying tower B) is regenerated, and is switched once every 24 hours to achieve continuous operation. The source nitrogen is sent to port a in the pipeline between valves KV101A and KV101B through valve V10, heater and deaerator. The left side of valve KV101A is connected to the air inlet of drying tower A, and the right side of valve KV101B is connected to the air inlet of drying tower B. At the air inlet, the pipeline where valves KV104A and KV104B are located is connected in parallel with the pipeline where valves KV101A and KV101B are located; the pipeline where valves KV102A and KV102B are located is connected between the air outlet of drying tower A and the air outlet of drying tower B, and the valves KV103A and The pipeline where KV103B is located is connected in parallel with the pipeline where valves KV102A and KV102B are located; the pipeline where valves KV104A and KV104B are located is equipped with a vent port b, which is connected to the cooler for venting; the pipeline between valves KV102A and KV102B is equipped with a nitrogen outlet to pass through The pipeline connects the valve V30, the pipeline between the valves KV103A and KV103B is equipped with a nitrogen outlet, and the pipeline connects the valve V20 and the valve V30. During regeneration, the pressure needs to be reduced to normal pressure first, then heated and released by nitrogen, cooled and released by nitrogen, and finally the pressure is increased to meet the working conditions for re-adsorption.

Therefore, during the entire regeneration process, the regeneration tower undergoes four processes: decompression, heating, cooling, and pressurization. The regeneration process is implemented under normal pressure, and a large part of the high-purity refined nitrogen is released into the air, resulting in a huge waste of energy. .

Contents of the invention

The purpose of this utility model is to provide an isobaric non-destructive regeneration control structure of a nitrogen purification system, which overcomes the shortcomings of the existing technology and can achieve the quality indicators of dew point <-60°C and trace oxygen <5PPm in refined nitrogen products, while dissipating The regenerated nitrogen is recycled and reused to achieve energy saving and consumption reduction goals.

In order to achieve the above purpose, the present utility model is achieved through the following technical solutions:

A nitrogen purification system isobaric lossless regeneration control structure, including drying tower A, drying tower B, cooler, valve KV101A, valve KV101B, valve KV102A, valve KV102B, valve KV103A, valve KV103B, valve KV104A, valve KV104B, valve KV101A There is port A on the connecting pipeline with valve KV101B, port B on the connecting pipeline between valve KV104A and valve KV104B, port C on the connecting pipeline between valve KV103A and valve KV103B, and port C on the connecting pipeline between valve KV102A and valve KV102B. There is a D port, which is characterized in that the nitrogen source passes through the valve V40 and is connected to one end of the valve KV105B, one end of the valve KV106B, one end of the V50, port A on the pipeline where the valve KV101A and the valve KV101B are located, and the other end of the valve V50. It is connected to the inlet of the pre-drying tower. The outlet of the pre-drying tower is connected to one end of the valve KV106A and one end of the valve KV105A through pipelines. There is an F port on the connecting pipeline between the other end of the valve KV106A and one end of the valve KV106B. There is an E port on the connecting pipeline between the other end of the valve KV105A and one end of the valve KV105B. The D port is connected to the product nitrogen pipeline through the valve V60. The C port is connected to the F port through the pipeline with a cooler. Connected; the B port is connected to the E port through a pipeline.

Furthermore, the valve KV101-106 is a pneumatic programmable ball valve.

Further, the cooler is a shell-and-tube cooler or a plate cooler.

Further, the pre-drying tower is a packed drying tower or a flash dryer.

Further, the oxygen content of the product nitrogen is <5PPm, and the dew point is <-60°C.

Furthermore, the regeneration process is isobaric regeneration without pressure reduction and charging process.

Furthermore, the valve V50 is a proportional pneumatic regulating ball valve.

Further, the pre-drying tower is equipped with high-strength molecular sieve or fine-pore silica gel added with PEN deoxidizer.

Compared with the existing technology, the beneficial effects of this utility model are:

1) Recycle and reuse the regenerated nitrogen that will be released to achieve process upgrades, solve the problem of isobaric pressure between adsorption and regeneration, and achieve the quality indicators of dew point <-60°C and trace oxygen <5PPm in refined nitrogen products, reducing the need for nitrogen regeneration. The pressing, heating, cooling and pressurizing processes are completed under isobaric conditions;

2) Environmental protection advantages: The isobaric non-destructive regeneration method can completely eliminate the noise pollution caused by the discharge of high-pressure nitrogen during pressure relief;

3) Energy-saving advantages: The isobaric lossless regeneration method can recover the regeneration gas consumption, and return it to the main gas path after deep drying to continue supplying cold rolling production with product gas, reducing energy loss and achieving the goal of energy saving and consumption reduction.

Description of the drawings

Figure 1 is a schematic block diagram of the process flow of the prior art;

Figure 2 is a schematic block diagram of the process flow of the embodiment of the present invention.

Implementation

The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments.

In order to more clearly explain the specific embodiments of the present invention or the technical solutions in the prior art, the drawings that need to be used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description The accompanying drawings illustrate some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the appended drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention.

See Figure 2, which is a structural schematic diagram of an embodiment of the isobaric lossless regeneration control structure of a nitrogen purification system of the present invention, including a drying tower A, a drying tower B, a cooler, valves KV101A, KV101B, KV102A, KV102B, and KV103A. , valve KV103B, valve KV104A, valve KV104B, the connecting pipeline of valve KV101A and valve KV101B is equipped with port A, the connecting pipeline of valve KV104A and valve KV104B is equipped with port B, the connecting pipeline of valve KV103A and valve KV103B is equipped with C Port, there is a D port on the connecting pipeline of valve KV102A and valve KV102B, which is characterized in that the nitrogen source passes through valve V40 and is connected through the pipeline to one end of valve KV105B, one end of valve KV106B, one end of V50, the location of valve KV101A and valve KV101B. Port A on the pipeline, the other end of the valve V50 is connected to the inlet of the pre-drying tower, the outlet of the pre-drying tower is connected to one end of the valve KV106A, one end of the valve KV105A through the pipeline, and the other end of the valve KV106A is connected to the other end of the valve KV106B There is an F port on the connecting pipeline between one end, and an E port on the connecting pipeline between the other end of the valve KV105A and one end of the valve KV105B. The D port is connected to the product nitrogen pipeline through the valve V60, and the C port is connected through the belt. The pipeline of the cooler is connected to port F; port B is connected to port E through the pipeline.

In the embodiment, the valve KV101-106 is a pneumatic programmable ball valve, and the suffixes A and B on its mark only indicate the identity difference between the adjacent drying towers and have nothing to do with the valve specifications and models. The cooler is a DN400 tube and shell cooler. The pre-drying tower is a DN1200×2300 packed drying tower. The oxygen content of the regenerated product nitrogen in the structure of the utility model is <5PPm, and the dew point is <-60°C.

The entire regeneration process is isobaric regeneration without pressure reduction and charging processes, which is an essential difference from the regeneration process of the nitrogen purification system in the prior art. Valve V50 is a proportional pneumatic regulating ball valve, which is used to accurately adjust the nitrogen source air intake to stabilize the pressure during the regeneration process.

The pre-drying tower is equipped with high-strength molecular sieve or fine-pore silica gel added with PEN deoxidizer. The function of PEN deoxidizer is to adsorb oxygen in nitrogen. High-strength molecular sieves preferably use 4A zeolite, which has a higher selective adsorption capacity for water than other zeolites. Fine-pore silica gel (A-type silica gel-TS6) is suitable for drying, moisture-proof and rust-proof, etc. It can prevent instruments, instruments, weapons and ammunition, electrical equipment, medicines, food, textiles and other various packaging items from getting damp. It can also be used as catalyst carrier and dehydration and refining of organic compounds. Because of its high bulk density and obvious hygroscopic effect at low humidity, it can be used as an air purifier to control air humidity. It is also widely used in shipping, because goods are often affected by moisture and deteriorate due to high humidity during transportation. Fine-pore silica gel can effectively remove moisture and prevent moisture, so that the quality of the goods can be guaranteed. Fine-pore silica gel is also often used for dehumidification between two layers of parallel sealed window panels to maintain the transparency of the two layers of glass. During the regeneration conversion process, if the pressure is reduced too quickly, the zeolite particles may shatter and pulverize. The higher the regeneration temperature, the safer the regeneration is, but at the same time, the greater the regeneration energy consumption, the service life of the molecular sieve may be shortened. Therefore, the regeneration temperature is suitable between 200-350℃. Generally speaking, the regeneration temperature should not exceed 600°C, otherwise the zeolite may lose activity. The utility model adopts isobaric control of adsorption and regeneration pressure, which can avoid the crushing failure of high-strength molecular sieves or fine-pore silica gel. PEN deoxidizer can adsorb and treat residual trace oxygen, so that the discharged nitrogen product can meet product quality standards.

In the embodiment of this utility model, a set of cold nitrogen units with a processing capacity of 1000Nm3/h is taken as an example. The regeneration gas consumption during regeneration is 20% of the processing capacity for a single unit of 200Nm3/h and a double unit of 400Nm3/h. The heating and venting process of the regeneration process is 12 hours, cooling and venting for 8 hours, annual regeneration nitrogen consumption cost: 400×20×360×0.33=950,400 yuan. Potential economic benefits: There are 10 existing devices with a processing capacity of 40,000Nm3/h (based on 10%). Calculated regeneration consumption is 4,000Nm3/h. The annual cost savings is 4,000×20×360×0.33=9.504 million yuan.

Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art will understand that various changes and modifications can be made to these embodiments without departing from the principles and spirit of the present invention. , substitutions and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (7)

1. The constant-pressure lossless regeneration control structure of the nitrogen purification system comprises a drying A tower, a drying B tower, a cooler, a valve KV101A and a valve KV101B, wherein the valve KV102A and the valve KV102B are respectively connected with one end of a valve KV105B through a pipeline, one end of a valve KV106B is connected with one end of a valve KV101A through a pipeline, one end of a valve KV105A is connected with one end of a valve KV106B through a pipeline, one end of a valve KV101A is connected with one end of a valve KV101B through a pipeline, the other end of the valve V50 is connected with an inlet of a predrying tower through a pipeline, one end of a valve KV105A is connected with one end of the valve KV106A through a pipeline, one end of the valve KV105A is connected with the other end of the predrying tower through a pipeline, a C port is arranged on the connecting pipeline, a port F105A is arranged between the other end of the valve 106A and one end of the valve 106B through a pipeline, a port F105B is arranged between the other end of the valve 106A and one end of the valve KV102B through a pipeline, and a port F is connected with the valve 60 through a pipeline, and a port is connected with the valve F60 through a port; and the port B is communicated with the port E through a pipeline.

2. The isobaric nondestructive regeneration control structure of a nitrogen purification system according to claim 1, wherein the valves KV101-106 are pneumatic programmed ball valves.

3. The isobaric lossless regeneration control structure of a nitrogen purification system according to claim 1, wherein said cooler is a shell-and-tube cooler or a plate cooler.

4. The isobaric lossless regeneration control structure of a nitrogen purification system according to claim 1, wherein said pre-drying tower is a packed drying tower or a flash dryer.

5. The isobaric lossless regeneration control structure of a nitrogen purification system according to claim 1, wherein the oxygen content of the product nitrogen is less than 5PPm and the dew point is less than-60 ℃.

6. The isopiestic lossless regeneration control structure for a nitrogen purge system according to claim 1, wherein the valve V50 is an equal-ratio pneumatic adjusting ball valve.

7. The isopiestic lossless regeneration control structure for a nitrogen purge system according to claim 1, wherein the pre-drying tower is filled with a high-strength molecular sieve or fine-pore silica gel to which a PEN deoxidizer is added.