Energy-saving piping structure of main inlet and outlet pipes of air separation cold box
By designing an energy-saving piping structure in an air division factory, using horizontally-set dirty nitrogen and air pipelines, the problems of increasing pipe length and energy consumption increase caused by traditional piping structures are solved, and efficient transportation of dirty nitrogen and air and energy-saving effects in air division factories are achieved.
Patent Information
- Application Number
- CN202420731938.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-10
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-04-10
AI Technical Summary
In air-dividing plants, traditional piping structures lead to increased pipe length and increased resistance, resulting in loss of waste nitrogen pressure and heat loss, increasing energy consumption of air compressors and heaters.
Design an energy-saving piping structure for the main inlet and outlet pipe of the air-separated cold box. By setting up dirt nitrogen pipelines and air pipelines horizontally on the platform, the length of the pipeline and the number of pipe fittings are reduced, and efficient transportation of dirt nitrogen and air is achieved.
It significantly reduces the length of the pipeline and the number of pipe fittings, reduces the resistance and heat loss of dirty nitrogen and air during pipeline transportation, thereby reducing the energy consumption of air compressors and heaters, and plays an important role in energy saving in air division plants.
Smart Images
Figure CN222617370U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of engineering piping, in particular to an energy-saving piping structure of main inlet and outlet pipes of an air separation cold box. Background Art
[0002] As the scale of chemical plants and steel mills expands, the scale of air separation equipment also expands. For air separation above 40,000 level, the advantages of vertical radial flow molecular sieve purifiers over horizontal purifiers are more obvious. At present, the use of vertical radial flow molecular sieves in air separation above 40,000 is gradually becoming popular. The difference between vertical radial flow molecular sieve purifiers and horizontal molecular sieve purifiers is that the air outlet and dirty nitrogen inlet pipes of the vertical radial flow molecular sieve purifier are located at the top of the equipment, about 20 meters in height, close to the height of the cold box pipe mouth, while the horizontal molecular sieve does not exceed 6 meters.
[0003] In an air separation plant, the resistance of the dirty nitrogen pipeline at the outlet of the cold box is particularly important for the overall energy consumption of the equipment. The dirty nitrogen from the cold box is transported to the heater by pipeline for heating, and then enters the purifier for hot blowing regeneration of the molecular sieve, and finally vented into the atmosphere. The venting pressure of the dirty nitrogen needs to be slightly higher than the atmospheric pressure. The air duct directly enters the cold box from the purifier. In traditional piping, it is difficult to directly cross the high-altitude pipeline, and the heater is placed on the ground. The pipeline needs to be turned down, supported by the pipe gallery, and then turned up and docked. This causes the pipeline to be turned down and up continuously, increasing the length of the pipeline, which will lead to an increase in the resistance along the pipeline and the pressure loss of dirty nitrogen, thereby increasing the pressure discharge demand of the air compressor and increasing energy consumption; at the same time, the increase in the length of the pipeline will also increase the heat loss of the dirty nitrogen hot pipeline, thereby increasing the heating temperature demand for the heater and increasing energy consumption. Utility Model Content
[0004] 1. Technical problems to be solved by the utility model
[0005] The utility model aims to solve the technical problems existing in the prior art and provides an energy-saving piping structure for the main inlet and outlet pipes of an air separation cold box, which can reduce the length of the pipeline and the number of pipe fittings, reduce the pressure and heat loss caused by the resistance along the pipeline, and further reduce the energy consumption of the air compressor and heater, thus playing an important role in energy saving of air separation.
[0006] 2. Technical solution
[0007] In order to solve the above problems, the technical solution provided by the utility model is:
[0008] An energy-saving piping structure for main inlet and outlet pipes of an air separation cold box comprises a plate heat exchanger cold box, a heater, a platform, an expansion machine room and a vertical radial flow molecular sieve purifier, wherein the plate heat exchanger cold box has a cold box dirty nitrogen outlet pipe and a cold box air inlet pipe, the heater has a heater dirty nitrogen inlet pipe and a heater dirty nitrogen outlet pipe, the vertical radial flow molecular sieve purifier has a purifier dirty nitrogen inlet pipe, a purifier dirty nitrogen vent pipe, a purifier air outlet pipe and a purifier air inlet pipe, the platform is arranged above the expansion machine room to lift the heater, the cold box dirty nitrogen outlet pipe and the heater dirty nitrogen inlet pipe are at the same height, the purifier dirty nitrogen inlet pipe and the purifier air outlet pipe are arranged on the top of the vertical radial flow molecular sieve purifier and are close to the height of the heater dirty nitrogen outlet pipe and the cold box air inlet pipe.
[0009] Optionally, the cold box dirty nitrogen outlet pipe and the heater dirty nitrogen inlet pipe are connected via a first dirty nitrogen pipeline, and the dirty nitrogen pipeline is horizontally arranged and installed on the platform.
[0010] Optionally, the heater dirty nitrogen outlet pipe and the purifier dirty nitrogen inlet pipe are connected via a second dirty nitrogen pipeline, and the second dirty nitrogen pipeline is horizontally arranged and installed on the platform.
[0011] Optionally, a cold blow pipe is connected between the first contaminated nitrogen pipeline and the second contaminated nitrogen pipeline.
[0012] Optionally, the number of the vertical radial flow molecular sieve purifiers is two, and the purifier contaminated nitrogen inlet pipes of the two vertical radial flow molecular sieve purifiers are both connected to the second contaminated nitrogen pipeline through a first branch pipe and a second branch pipe.
[0013] Optionally, the purifier air outlet pipe and the cold box air inlet pipe are connected via an air duct, and the air duct is horizontally arranged and installed on the platform.
[0014] Optionally, the number of the vertical radial flow molecular sieve purifiers is two, and the purifier air outlet pipes of the two vertical radial flow molecular sieve purifiers are connected to the air duct via a third branch pipe and a fourth branch pipe.
[0015] Optionally, the platform includes a platform plate and a plurality of legs for supporting the platform plate.
[0016] 3. Beneficial effects
[0017] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:
[0018] The energy-saving piping structure of the main inlet and outlet pipes of the air separation cold box greatly reduces the length of the pipeline and the number of pipe fittings, including reducing the pipeline length by about 72% and the number of pipe fittings by about 80%. It reduces the resistance along the pipeline transportation of dirty nitrogen and air, further reduces the air compressor discharge pressure, thereby reducing the air compressor energy consumption, and also reduces the heat loss of the dirty nitrogen pipeline, thereby reducing the energy consumption of the heater, which plays a huge role in air separation energy saving. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 A schematic diagram of the structure of an energy-saving piping structure for the main inlet and outlet pipes of an air separation cold box proposed in an embodiment of the utility model;
[0020] Figure 2 A schematic diagram of the pipeline layout of an energy-saving piping structure for the main inlet and outlet pipes of an air separation cold box proposed in an embodiment of the utility model;
[0021] Figure 3 A schematic diagram of the pipeline connection of an energy-saving piping structure for the main inlet and outlet pipes of an air separation cold box proposed in an embodiment of the utility model;
[0022] 1. Plate heat exchanger cold box; 101. Dirty nitrogen branch pipe; 102. Dirty nitrogen outlet pipe of cold box; 103. Air inlet pipe of cold box; 104. Air branch pipe; 2. Heater; 201. Dirty nitrogen inlet pipe of heater; 202. Dirty nitrogen outlet pipe of heater; 3. Platform; 4. Expansion room; 6. Vertical radial flow molecular sieve purifier; 601. Dirty nitrogen inlet pipe of purifier; 602. Dirty nitrogen vent pipe of purifier; 603. Air outlet pipe of purifier; 604. Air inlet pipe of purifier; 7. First dirty nitrogen pipeline; 8. Second dirty nitrogen pipeline; 801. First branch pipe; 802. Second branch pipe; 9. Cold blow pipe; 10. Air pipeline; 1001. Third branch pipe; 1002. Fourth branch pipe. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described here are only used to explain the utility model and do not limit the protection scope of the utility model.
[0024] It should be noted that when an element is referred to as being "fixed to", "disposed on", "fixed on" or "installed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. Further, when an element is considered to be "fixedly connected to" another element, the two may be fixed in a detachable connection manner or in a non-detachable connection manner, such as socketing, snap-on, one-piece fixation, welding, etc., which can be achieved in the prior art and will not be repeated here. When an element is perpendicular or approximately perpendicular to another element, it means that the ideal state of the two is vertical, but due to the influence of manufacturing and assembly, there may be a certain vertical error. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.
[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.
[0026] The “first” and “second” involved in the present invention do not represent specific quantities and orders, but are merely used to distinguish names.
[0027] Combined with Figure 1-3The energy-saving piping structure of the main inlet and outlet pipes of an air separation cold box of the present embodiment includes a plate heat exchanger cold box 1, a heater 2, a platform 3, an expansion room 4 and a vertical radial flow molecular sieve purifier 6. The equipment is arranged in a row, and the order is the plate heat exchanger cold box 1, the heater 2 and the vertical radial flow molecular sieve purifier 6. The platform 3 and the expansion room 4 are arranged below the heater 2 from top to bottom. The plate heat exchanger cold box 1 has a cold box dirty nitrogen outlet pipe 102 and a cold box air inlet pipe 103. The heater 2 has a heater dirty nitrogen inlet pipe 201 and a heater dirty nitrogen outlet pipe 202. The vertical radial flow molecular sieve purifier 6 has a purifier dirty nitrogen inlet pipe 601, a purifier dirty nitrogen vent pipe 602, and a purifier air outlet pipe 603. and the purifier air inlet pipe 604, the platform 3 is used to lift the heater 2, so that the cold box dirty nitrogen outlet pipe 102 and the heater dirty nitrogen inlet pipe 201 are at the same height, so that the cold box dirty nitrogen outlet pipe can enter the heater along the horizontal direction, reducing elbows, the purifier dirty nitrogen inlet pipe 601 and the purifier air outlet pipe 603 are arranged at the top of the vertical radial flow molecular sieve purifier 6 and are close to the height of the heater dirty nitrogen outlet pipe 202 and the cold box air inlet pipe 103, the purifier dirty nitrogen vent pipe 602 and the purifier air inlet pipe 604 are arranged at the bottom of the radial flow molecular sieve purifier 6, and the air directly enters the plate heat exchanger cold box 1 from the vertical radial flow molecular sieve purifier 6, and the pipe openings with similar heights can achieve the crossing and docking of the pipes. With the help of the platform, the air duct can achieve crossing and docking at a high place, without the need to turn down the pipe in the traditional piping to the height of the pipe gallery, and then turn up to the height of the cold box air inlet with the help of the pipe gallery support, avoiding unnecessary descending and ascending pipes.
[0028] The energy-saving piping structure of the main inlet and outlet pipes of this air separation cold box meets the process requirements of large air separation plants, fully utilizes the distance between equipment, saves piping space, and most importantly, reduces the length of the pipeline, avoids the redundancy of the pipeline length caused by the continuous downward and upward turning of the pipeline, and reduces the resistance and heat loss along the pipeline transportation process of air and polluted nitrogen. It reduces the pressure loss of materials, thereby reducing the energy consumption of dynamic equipment such as air compressors; reducing heat loss can reduce the energy consumption of heaters, which plays an important role in energy saving in air separation plants.
[0029] As a preferred solution of the utility model, the purifier dirty nitrogen inlet pipe 601 and the purifier air outlet pipe 603 are the same pipe, and the purifier dirty nitrogen vent pipe 602 and the purifier air inlet pipe 604 are the same pipe.
[0030] As a preferred embodiment of the present invention, there are multiple heat exchangers in the plate heat exchanger cold box 1, and each heat exchanger has a dirty nitrogen branch pipe 101 at the top, and all the dirty nitrogen branch pipes 101 are collected at the top of the plate heat exchanger cold box to the cold box dirty nitrogen outlet pipe 102; similarly, the cold box air inlet pipe 103 is divided into multiple branches at the top of the plate heat exchanger cold box, and each air branch pipe 104 introduces air into the heat exchanger.
[0031] As a preferred solution of the utility model, the cold box dirty nitrogen outlet pipe 102 and the heater dirty nitrogen inlet pipe 201 are connected through the first dirty nitrogen pipeline 7. The pipeline is always in a horizontal position and is located on the platform 3. It relies on the platform 3 for support. The dirty nitrogen coming out of the plate heat exchanger is merged into the main pipe and exits the cold box. The pipeline always enters the heater 2 horizontally. A flow meter is installed on the horizontal first dirty nitrogen pipeline 7, which saves pipeline space while also meeting the requirements of the front and rear straight pipe sections of the flow meter.
[0032] As a preferred solution of the utility model, the heater dirty nitrogen outlet pipe 202 and the purifier dirty nitrogen inlet pipe 601 are connected through the second dirty nitrogen pipeline 8, the second dirty nitrogen pipeline 8 is horizontally arranged and installed on the platform 3, the number of vertical radial flow molecular sieve purifiers 6 is two, and the purifier dirty nitrogen inlet pipes 601 of the two vertical radial flow molecular sieve purifiers 6 are connected to the second dirty nitrogen pipeline 8 through the first branch pipe 801 and the second branch pipe 802, and the second dirty nitrogen pipeline 8 is also horizontally oriented, and is divided into two streams and enters from the top of the vertical radial flow molecular sieve purifier 6. Since the height of the heater dirty nitrogen outlet pipe 202 and the height of the purifier dirty nitrogen inlet pipe 601 are both relatively high, there is no redundant descending and ascending pipeline when the heater 2 is raised, and all horizontal pipelines are supported by the platform 3.
[0033] As a preferred embodiment of the present invention, the first contaminated nitrogen pipeline 7 is arranged below the second contaminated nitrogen pipeline 8, and a cold blow pipe 9 is connected between the first contaminated nitrogen pipeline 7 and the second contaminated nitrogen pipeline 8. The cold blow pipe 9 is a vertically arranged 90° elbow. The upper end of the cold blow pipe 9 is connected to the second contaminated nitrogen pipeline 8, and the lower end is connected to the first contaminated nitrogen pipeline 7. The pipeline meets the stress compensation and the pipeline length is minimized.
[0034] As a preferred solution of the utility model, the purifier air outlet pipe 603 and the cold box air inlet pipe 103 are connected through an air duct 10. The air duct 10 is a horizontal pipe supported by the platform 3. The air finally enters the air main pipe 103 of the plate heat exchanger cold box 1.
[0035] As a preferred embodiment of the present invention, there are two vertical radial flow molecular sieve purifiers 6, and the purifier air outlet pipes 603 of the two vertical radial flow molecular sieve purifiers 6 are connected to the air duct 10 through the third branch pipe 1001 and the fourth branch pipe 1002. The two purifiers operate alternately, and their pipeline configurations are completely symmetrical.
[0036] As a preferred solution of the utility model, the platform 3 includes a platform plate and a plurality of legs for supporting the platform plate, the lower ends of the legs abut against the top of the expansion room 4, and the platform 3 is located on the upper part of the expansion room 4, making full use of the space.
[0037] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.
Claims
1. An energy-saving piping structure for the main inlet and outlet pipes of an air separation cold box, characterized in that: It comprises a plate heat exchanger cold box, a heater, a platform, an expansion machine room and a vertical radial flow molecular sieve purifier, wherein the plate heat exchanger cold box has a cold box dirty nitrogen outlet pipe and a cold box air inlet pipe, the heater has a heater dirty nitrogen inlet pipe and a heater dirty nitrogen outlet pipe, the vertical radial flow molecular sieve purifier has a purifier dirty nitrogen inlet pipe, a purifier dirty nitrogen vent pipe, a purifier air outlet pipe and a purifier air inlet pipe, the platform is arranged above the expansion machine room to lift the heater, the cold box dirty nitrogen outlet pipe and the heater dirty nitrogen inlet pipe are at the same height, the purifier dirty nitrogen inlet pipe and the purifier air outlet pipe are arranged on the top of the vertical radial flow molecular sieve purifier and are close to the height of the heater dirty nitrogen outlet pipe and the cold box air inlet pipe.
2. The energy-saving piping structure of the main inlet and outlet pipes of the air separation cold box according to claim 1 is characterized in that: The cold box dirty nitrogen outlet pipe and the heater dirty nitrogen inlet pipe are connected through a first dirty nitrogen pipeline, and the dirty nitrogen pipeline is horizontally arranged and installed on the platform.
3. The energy-saving piping structure of the main inlet and outlet pipes of the air separation cold box according to claim 2 is characterized in that: The heater dirty nitrogen outlet pipe and the purifier dirty nitrogen inlet pipe are connected through a second dirty nitrogen pipeline, and the second dirty nitrogen pipeline is horizontally arranged and installed on the platform.
4. The energy-saving piping structure of the main inlet and outlet pipes of the air separation cold box according to claim 3 is characterized in that: A cold blow pipe is connected between the first contaminated nitrogen pipeline and the second contaminated nitrogen pipeline.
5. The energy-saving piping structure of the main inlet and outlet pipes of the air separation cold box according to claim 3 is characterized in that: There are two vertical radial flow molecular sieve purifiers, and the purifier contaminated nitrogen inlet pipes of the two vertical radial flow molecular sieve purifiers are connected to the second contaminated nitrogen pipeline through a first branch pipe and a second branch pipe.
6. The energy-saving piping structure of the main inlet and outlet pipes of the air separation cold box according to claim 1 is characterized in that: The purifier air outlet pipe and the cold box air inlet pipe are connected through an air duct, and the air duct is horizontally arranged and installed on the platform.
7. The energy-saving piping structure of the main inlet and outlet pipes of the air separation cold box according to claim 6 is characterized in that: The number of the vertical radial flow molecular sieve purifiers is two, and the purifier air outlet pipes of the two vertical radial flow molecular sieve purifiers are connected to the air pipeline through the third branch pipe and the fourth branch pipe.
8. An energy-saving piping structure for the main inlet and outlet pipes of an air separation cold box according to any one of claims 1 to 7, characterized in that: The platform includes a platform plate and a plurality of legs for supporting the platform plate.