CN216011430U

CN216011430U - Air separation liquid nitrogen pipeline for product quality control optimization

Info

Publication number: CN216011430U
Application number: CN202121875005.0U
Authority: CN
Inventors: 张选福; 王洪磊; 张斌; 柳立明; 郑海宁
Original assignee: Baotou Yingde Gas Co ltd
Current assignee: Baotou Yingde Gas Co ltd
Priority date: 2021-08-12
Filing date: 2021-08-12
Publication date: 2022-03-11
Anticipated expiration: 2031-08-12

Abstract

The utility model discloses an air separation liquid nitrogen pipeline for product quality control optimization, which comprises an air separation box, a nitrogen storage tank and a rectifying tower, wherein the four corners of the outer surface of the nitrogen storage tank, which are close to the middle, are connected with the rectifying tower through liquid nitrogen pipes, the positions of the outer surface of the rectifying tower, which are close to the bottom end, are connected with the air separation box through conveying pipes, the middle positions of the bottom ends of the outer surface of the liquid nitrogen pipes are provided with discharge pipes, the connecting positions of the liquid nitrogen pipes, which are close to one side of the nitrogen storage tank, are provided with automatic valves, and the middle positions of the discharge pipes are provided with manual valves. The utility model solves the problems that the existing device is only provided with a discharge pipeline between an automatic valve and a manual valve, the overflow amount of liquid nitrogen is difficult to control during component analysis, the analysis result is easy to deviate due to too small opening degree of the valve, the liquid nitrogen is taken out due to too large opening degree of the valve, analysis cannot be carried out, and the risk of frostbite exists, and improves the production quality of the device.

Description

Air separation liquid nitrogen pipeline for product quality control optimization

Technical Field

The utility model relates to the technical field of air separation equipment, in particular to an air separation liquid nitrogen pipeline for product quality control optimization.

Background

The air separation equipment is equipment which takes air as a raw material, turns the air into liquid by a compression cycle deep freezing method, and gradually separates and produces inert gases such as oxygen, nitrogen, argon and the like from the liquid air by rectification, and the air separation equipment is a large-scale complex system and mainly comprises the following subsystems: the system comprises a power system, a purification system, a refrigeration system, a heat exchange system, a rectification system, a product conveying system, a liquid storage system, a control system and the like, wherein a liquid nitrogen pipeline is required to control a liquid nitrogen production process in an air separation plant.

The existing liquid nitrogen pipeline is only provided with a discharge pipeline between an automatic valve and a manual valve, the overflow amount of liquid nitrogen is difficult to control during component analysis, the analysis result is prone to deviation due to too small valve opening, the liquid nitrogen is taken out due to too large valve opening, analysis cannot be conducted, and the risk of frostbite exists.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an air separation liquid nitrogen pipeline for product quality control optimization, which has the advantage of accurate analysis and solves the problems that the existing device is only provided with a discharge pipeline between an automatic valve and a manual valve, the overflow amount of liquid nitrogen is difficult to control during component analysis, the analysis result is easy to deviate due to too small valve opening, the liquid nitrogen is taken out due to too large valve opening, analysis cannot be carried out and the risk of frostbite exists.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a product quality is accuse optimization with empty branch liquid nitrogen pipeline, includes empty branch case, nitrogen storage tank and rectifying column, wherein four angular position departments in the middle of being close to of nitrogen storage tank surface all have the rectifying column through liquid nitrogen union coupling, the rectifying column surface is close to bottom position department and has the empty branch case through duct connections, liquid nitrogen outside of tubes surface bottom intermediate position department all installs the delivery pipe.

Preferably, automatic valves are installed at the connecting positions of the liquid nitrogen pipes close to one side of the nitrogen storage tank.

Preferably, a manual valve is installed at the middle position of the discharge pipe, and an analyzer is installed on the outer surface of the discharge pipe close to the tail end position.

Preferably, the outer surface of the liquid nitrogen pipe is located at one side of the automatic valve and is provided with a connecting pipe B, the middle position of the connecting pipe B is provided with a needle valve, the tail end of the connecting pipe B is provided with a spiral heat exchange pipe, and the tail end of the spiral heat exchange pipe is connected to the outer surface of the discharge pipe through a connecting pipe A.

Preferably, the heat exchanger is installed in spiral heat exchange tube surface position department, heat exchanger top intermediate position department installs the heater, the heater bottom is located the inside top position department of heat exchanger and installs the heater strip.

Preferably, an alarm is arranged at the position, on one side of the heater, of the top end of the heat exchanger.

Compared with the prior art, the utility model has the following beneficial effects:

1. according to the utility model, the effect of increasing the heat exchange area of liquid nitrogen is achieved by arranging the connecting pipe A, the connecting pipe B and the spiral heat exchange pipe, the connecting pipe B is arranged at the position, located on one side of the automatic valve, on the outer surface of the liquid nitrogen pipe, the needle valve is arranged at the middle position of the connecting pipe B, the spiral heat exchange pipe is arranged at the tail end position of the connecting pipe B, and the connecting pipe A is arranged at the tail end position of the spiral heat exchange pipe and connected to the outer surface of the discharge pipe, so that the problems that only a discharge pipeline is arranged between the automatic valve and the manual valve, the overflow amount of liquid nitrogen is difficult to control during composition analysis, the analysis result is deviated due to too small opening degree of the valve, the analysis result is deviated due to too large opening degree of the valve, the analysis cannot be carried out, and the risk of frostbite exists are solved, and the analysis accuracy of the utility model is improved.

2. According to the utility model, the analyzer and the alarm are arranged, so that the effects of rapidly analyzing the quality of the liquid nitrogen and alarming are achieved, the analyzer is arranged at the position, close to the tail end, of the outer surface of the discharge pipe, and the alarm is arranged at the position, located on one side of the heater, of the top end of the heat exchanger, so that the problem that the analysis result needs to be inquired and concerned manually at any time is solved, and the use convenience of the liquid nitrogen alarm is improved.

3. According to the utility model, the heater and the heating wire are arranged, so that the effect of increasing the gasification efficiency of liquid nitrogen gas in the spiral heat exchange tube is achieved, the heat exchanger is arranged at the outer surface position of the spiral heat exchange tube, the heater is arranged at the middle position of the top end of the heat exchanger, and the heating wire is arranged at the position, located at the top end of the heat exchanger, of the bottom end of the heater, so that the problems that the gasification efficiency of the liquid nitrogen in the spiral heat exchange tube is low, the subsequent analysis is influenced are solved, and the analysis accuracy of the utility model is improved.

Drawings

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is an enlarged view of A in FIG. 1;

fig. 3 is a schematic sectional structure view of the heat exchange box of the present invention.

In the figure: 1. separating the boxes in an air way; 2. a nitrogen storage tank; 3. a rectifying tower; 4. a delivery pipe; 5. a liquid nitrogen pipe; 6. a manual valve; 7. an analyzer; 8. a connecting pipe A; 9. a heat exchanger; 10. a connecting pipe B; 11. a needle valve; 12. an automatic valve; 13. a heater; 14. an alarm; 15. a discharge pipe; 16. a spiral heat exchange tube; 17. a heating wire.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 and fig. 2, the technical solution of the air separation liquid nitrogen pipeline for product quality control optimization provided by the present invention is: the utility model provides a product quality is accuse optimization with empty branch liquid nitrogen pipeline, including air separation case 1, store up nitrogen jar 2 and rectifying column 3, store up nitrogen jar 2 surface and all be connected with rectifying column 3 through liquid nitrogen pipe 5 near four middle angular position departments, rectifying column 3 surface is close to bottom position department and is connected with air separation case 1 through conveyer pipe 4, discharge pipe 15 is all installed to 5 surface bottom intermediate position departments of liquid nitrogen pipe, automatic valve 12 is all installed to liquid nitrogen pipe 5 near 2 one side hookup location departments of nitrogen jar, manual valve 6 is installed to 15 intermediate position departments of discharge pipe, be used for discharging unqualified nitrogen gas, 15 surfaces of discharge pipe are close to end position department and install analysis appearance 7, be used for carrying out the analysis to the nitrogen gas composition, 9 tops of heat exchanger are located 13 one side position department and install alarm 14.

Referring to fig. 2 and fig. 3, the technical solution of the air separation liquid nitrogen pipeline for product quality control optimization provided by the present invention is: an air separation liquid nitrogen pipeline for product quality control optimization comprises an air separation box 1, a nitrogen storage tank 2 and a rectifying tower 3, wherein the four corners of the outer surface of the nitrogen storage tank 2 near the middle are connected with the rectifying tower 3 through liquid nitrogen pipes 5, the outer surface of the rectifying tower 3 near the bottom is connected with the air separation box 1 through a conveying pipe 4, the middle position of the outer surface of the liquid nitrogen pipe 5 at the bottom is provided with a discharge pipe 15, the outer surface of the liquid nitrogen pipe 5 at one side of an automatic valve 12 is provided with a connecting pipe B10, the middle position of a connecting pipe B10 is provided with a needle valve 11, the tail end of a connecting pipe B10 is provided with a spiral heat exchange pipe 16 to prevent nitrogen from flowing out in a liquid state and cannot perform composition analysis, the tail end of the spiral heat exchange pipe 16 is connected with the outer surface of the discharge pipe 15 through a connecting pipe A8, the outer surface of the spiral heat exchange pipe 16 is provided with a heat exchanger 9, and the middle position of the top of the heat exchanger 9 is provided with a heater 13, the bottom end of the heater 13 is arranged at the top end inside the heat exchanger 9, and a heating wire 17 is arranged at the top end to heat water inside the heat exchanger 9 and quickly exchange heat for liquid nitrogen inside the spiral heat exchange tube 16.

The working principle is as follows: after the device is installed, the air separation box 1 produces liquid nitrogen through the rectifying tower 3 while normally producing and running, the liquid nitrogen is conveyed to the nitrogen storage tank 2 through the liquid nitrogen pipe 5, when the working condition is recovered after the single set of air separation box 1 is shut down to prepare for producing the liquid nitrogen, the automatic valve 12 on the liquid nitrogen pipe 5 on one side of the shut down air separation box 1 is closed, the needle valve 11 is opened, the liquid nitrogen is conveyed to the spiral heat exchange pipe 16 through the connecting pipe B10, the heater 13 is started, water in the heat exchanger 9 is heated through the heater 13 and the heating wire 17, the liquid nitrogen in the spiral heat exchange pipe 16 is subjected to heat exchange and gasification, the gasified nitrogen is conveyed to the discharge pipe 15 through the connecting pipe A8 and then discharged through the tail end of the discharge pipe 15, meanwhile, the analyzer 7 is used for analyzing the nitrogen components, if the nitrogen is qualified, the needle valve 11 is closed, the automatic valve 12 is opened, the liquid nitrogen is guided into the nitrogen storage tank 2, if the nitrogen is unqualified, the alarm 14 gives an alarm to remind an operator to open the manual valve 6 and discharge liquid nitrogen through the discharge pipe 15, so that the working process of the equipment is completed.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a product quality is accuse optimization with empty liquid nitrogen pipeline that divides, includes air separation case (1), nitrogen storage tank (2) and rectifying column (3), its characterized in that: four angular position departments in the middle of storing up nitrogen jar (2) surface are close to all are connected with rectifying column (3) through liquid nitrogen pipe (5), rectifying column (3) surface is close to bottom position department and is connected with air separator (1) through conveyer pipe (4), discharge pipe (15) are all installed to liquid nitrogen pipe (5) surface bottom intermediate position department.

2. The air separation liquid nitrogen pipeline for product quality control optimization according to claim 1, characterized in that: automatic valves (12) are installed at the connecting positions of the liquid nitrogen pipe (5) close to one side of the nitrogen storage tank (2).

3. The air separation liquid nitrogen pipeline for product quality control optimization according to claim 1, characterized in that: a manual valve (6) is installed at the middle position of the discharge pipe (15), and an analyzer (7) is installed on the outer surface of the discharge pipe (15) close to the tail end position.

4. The air separation liquid nitrogen pipeline for product quality control optimization according to claim 1, characterized in that: liquid nitrogen pipe (5) surface is located automatic valve (12) one side position department and installs connecting pipe B (10), connecting pipe B (10) intermediate position department installs needle valve (11), connecting pipe B (10) end position department installs spiral heat exchange tube (16), spiral heat exchange tube (16) end position department connects in delivery pipe (15) surface through connecting pipe A (8).

5. The air separation liquid nitrogen pipeline for product quality control optimization according to claim 4, characterized in that: the spiral heat exchange tube (16) surface position department installs heat exchanger (9), heat exchanger (9) top intermediate position department installs heater (13), heater (13) bottom is located the inside top position department of heat exchanger (9) and installs heater strip (17).

6. The air separation liquid nitrogen pipeline for product quality control optimization according to claim 5, characterized in that: and an alarm (14) is arranged at the position of one side of the heater (13) at the top end of the heat exchanger (9).