CN108692524B - Industrial oxygen and nitrogen production process and production line thereof - Google Patents

Industrial oxygen and nitrogen production process and production line thereof Download PDF

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Publication number
CN108692524B
CN108692524B CN201810347695.9A CN201810347695A CN108692524B CN 108692524 B CN108692524 B CN 108692524B CN 201810347695 A CN201810347695 A CN 201810347695A CN 108692524 B CN108692524 B CN 108692524B
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air
tower
pipe
molecular sieve
water
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CN108692524A (en
Inventor
毛玲玲
柴晓明
徐庆松
李春胜
唐波
周建
王彦
朱洪丽
姚德才
姜丽贞
蒋忠智
宋哲华
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Quzhou Hangyang Gas Co ltd
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Quzhou Hangyang Gas Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04012—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling
    • F25J3/04018—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling of main feed air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04109—Arrangements of compressors and /or their drivers
    • F25J3/04115—Arrangements of compressors and /or their drivers characterised by the type of prime driver, e.g. hot gas expander
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04163—Hot end purification of the feed air
    • F25J3/04169—Hot end purification of the feed air by adsorption of the impurities

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Separation Of Gases By Adsorption (AREA)

Abstract

The invention relates to an industrial oxygen and nitrogen production process and a production line thereof, wherein raw air respectively passes through a self-cleaning air filter, a turbine compressor, an air cooling tower, a molecular sieve absorber, a main heat exchanger and a fractionating tower cold box which are sequentially connected, pure nitrogen is led out from the top of the upper tower of the fractionating tower cold box, is reheated in the subcooler and the main heat exchanger and then is discharged out of the fractionating tower cold box, and the raw air is divided into two paths after being metered: one path is sent into a water cooling tower, the rest is taken as a nitrogen product, and the product liquid oxygen and liquid nitrogen are respectively sent into respective storage tanks through valves; the industrial oxygen and nitrogen production process has the advantages that through reasonable equipment arrangement, pretreatment methods and equipment and reasonable process parameter design, the purity of the separated oxygen and nitrogen finished products is higher, the production efficiency is accelerated, and the requirements of industrial oxygen and nitrogen are completely met.

Description

Industrial oxygen and nitrogen production process and production line thereof
Technical Field
The invention relates to a gas production process, in particular to an industrial oxygen and nitrogen production process and a production line thereof.
Background
In the production process of industrial oxygen and nitrogen, raw air is usually introduced into an air filter to remove dust and impurities, then is compressed by an air compressor and then enters an air cooling tower to be cooled, so that the temperature of the air entering the tower is reduced, the air separation energy consumption is reduced, the water content of the air entering the tower is reduced, the self-cleaning burden of a switching heat exchanger is reduced, the adsorption capacity of a molecular sieve is improved, the adsorption burden of the molecular sieve is reduced, and the impurities in the air are washed. For example, chinese patent industrial nitrogen production process [ CN103216999A ] discloses the following technical scheme: the industrial nitrogen production process is characterized by comprising the following steps: raw material air enters an air filter, dust and mechanical impurities are filtered out, and then the raw material air enters an air compressor for compression; the compressed high-pressure gas enters an air cooling tower in an air precooling system to be cooled and washed, and a free water separation device and a liquid flooding prevention device are arranged at the top of the air cooling tower to prevent the free water in the air from being carried out. The production efficiency of the production method of the industrial nitrogen in the comparison document is low, only industrial nitrogen can be produced singly, industrial oxygen cannot be produced along with the production of the industrial nitrogen, the mode is single, the resource waste is large, the energy consumption and the production ratio are low, the integral purity of the produced nitrogen is not high, and the normal use is influenced by excessive impurities; the air cooling tower adopted in the comparison document only adopts a water cooling method, namely, the cooling effect of raw material air subjected to dust removal and impurity removal in unit time is limited, the cooling efficiency is low, and once too much raw material air is introduced into the air cooling tower at one time, the raw material air can not be cooled to reach the preset effect, so that the adsorption burden of the molecular sieve is increased after the raw material air which is not fully cooled is introduced into the molecular sieve, the adsorbability in unit time is reduced, and the energy consumption of air separation is increased, thereby affecting the overall production efficiency; the existing air cooling tower has the phenomena of poor cooling effect, incomplete washing of raw material air, influence on the nitrogen content concentration of industrial nitrogen production finished products and certain limitation on the preparation of high-concentration industrial nitrogen.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the industrial oxygen and nitrogen production process and the production line thereof, which have the advantages of low energy consumption, high production efficiency, good production effect, high efficiency of the air cooling tower and good cooling effect.
The technical scheme of the invention is realized as follows: the industrial oxygen and nitrogen production process is characterized by comprising the following steps:
1) the raw material air is passed through a self-cleaning air filter to remove dust and other mechanical impurities, and then is compressed by a raw material air turbine compressor to a pressure of 0.59MPa (A) and a temperature of 100 ℃;
2) compressed high-pressure air enters an air cooling tower for precooling, cooling water enters the air cooling tower in a section, circulating cooling water is arranged at the lower section and has the temperature of about 30-35 ℃, low-temperature water cooled by a water cooling tower is arranged at the upper section and has the temperature of about 8-15 ℃, the air passes through the air cooling tower from bottom to top for cooling and cleaning, and the temperature of the air is reduced to 18 ℃ after the air is cooled by the air cooling tower;
3) the cooled clean air enters a molecular sieve adsorber switched for use, and carbon dioxide, hydrocarbon and residual water vapor are adsorbed and removed;
4) the purified air is divided into three paths, and one path of the purified air enters a cold box of a fractionating tower after being pressurized by a pressurizing end of a pressurizing turboexpander; one path enters an instrument control system to be used as instrument gas; one path of air directly enters a cold box of a fractionating tower, the air exchanges heat with return gas (gas oxygen, gas nitrogen and waste nitrogen) in a main heat exchanger to reach the air liquefaction temperature of-175 ℃, and enters a lower tower of the cold box of the fractionating tower, 245780 Nm3/h of pressurized air is pumped out to enter a turbo expander for expansion and refrigeration when being cooled to-114 ℃ by the return cold gas in the main heat exchanger, and finally the pressurized air is sent to an upper tower 22960Nm3/h of the cold box of the fractionating tower;
5) in the lower tower of the cooling box of the fractionating tower, air is primarily separated into nitrogen and oxygen-enriched liquid air, the nitrogen at the top is liquefied in a main condensation evaporator, meanwhile, liquid oxygen at the low-pressure side of the main condensation evaporator is gasified, part of liquid nitrogen is taken as reflux liquid of the lower tower of the cooling box of the fractionating tower, the other part of liquid nitrogen is led out from the top of the lower tower of the cooling box of the fractionating tower, is supercooled by pure nitrogen and polluted nitrogen through a cooler and then is led into the top of an auxiliary tower of the upper tower of the cooling box of the fractionating tower through a throttle to be taken as reflux liquid, and the liquid air extracted from the bottom of the lower tower of the cooling box of the fractionating tower is supercooled in the subcooler and then;
6) the product oxygen is led out from the bottom of an upper tower of a fractionating tower cold box, is reheated by an expanded air heat exchanger and a main heat exchanger, then is discharged out of the fractionating tower cold box, is compressed by an oxygen turbine compressor and is sent to a user pipe network, the dirty nitrogen is led out from the upper tower part of the fractionating tower cold box, is reheated by a cooler and the main heat exchanger, is discharged out of the fractionating tower cold box, one part of the regenerated gas is used as a molecular sieve adsorber, the other part of the regenerated gas is discharged to a water cooling tower, the pure nitrogen is led out from the top of the upper tower of the fractionating tower cold box, is reheated in the subcooler and the main heat exchanger, is: the extraction flow is 30000Nm3/h, the extraction flow is sent to a water cooling tower, the rest is used as a nitrogen product, and the product liquid oxygen and the product liquid nitrogen are respectively sent to respective storage tanks through valves.
Preferably: in the step (3), two molecular sieve adsorbers are switched for use, wherein when one molecular sieve adsorber works, the other molecular sieve adsorber is regenerated, the switching period of the molecular sieve adsorber is 8 hours, and the molecular sieve adsorber is automatically switched at regular time.
By adopting the technical scheme, the industrial oxygen and nitrogen production process disclosed by the invention has the advantages that through reasonable equipment arrangement, pretreatment methods and equipment and reasonable process parameter design, the purity of the separated oxygen and nitrogen finished products is higher, the production efficiency is accelerated, and the requirements of industrial oxygen and nitrogen are completely met.
The invention also discloses a production line for the industrial oxygen and nitrogen production process, which is characterized in that: including self-cleaning formula air cleaner, turbo compressor, air cooling tower, molecular sieve adsorber, main heat exchanger and the fractionating tower cold box that connects gradually, the fractionating tower cold box includes that the fractionating tower cold box goes up the tower, the fractionating tower cold box lower tower and the fractionating tower cold box upper tower are assisted the tower, the fractionating tower cold box upper tower is connected with subcooler and expansion air heat exchanger respectively, subcooler and expansion air heat exchanger all are connected with main heat exchanger, be connected with oxygen turbo compressor, storage tank and water-cooling tower on the main heat exchanger respectively, the output of oxygen turbo compressor is connected with the user pipe network that is used for leading to the user, the air cooling tower is connected with the water-cooling tower through low temperature water inlet pipe, be connected with main condensation evaporimeter on the fractionating tower cold box lower tower, main condensation evaporimeter is connected with the fractionating tower cold box upper tower through subcooler and the tower is assisted to the fractionating tower cold box upper tower, one side of fractionating tower cold box upper tower is provided with and is arranged in letting in behind the pressurized air expansion to the fractionating tower cold box And the molecular sieve absorber is connected with the lower tower of the cold box of the fractionating tower through a turbine expander.
Preferably: the turbine compressor comprises a rotating shaft, an impeller and a shell, wherein the impeller and the shell are fixedly arranged at one end of the rotating shaft, the rotating shaft and the impeller are arranged inside the shell, an air inlet and an air outlet are formed in the shell, the air inlet and the impeller are coaxially arranged, a pair of guide plates are fixedly arranged on the inner wall of the shell close to the impeller, the guide plates and the air inlet are arranged on the same side surface of the shell, the pair of guide plates are symmetrically arranged on the upper side and the lower side of the rotating shaft, the guide plates are arranged to form an included angle of thirty degrees with the inner wall of the shell, and diamond-; the impeller is characterized in that a flow channel and a diffuser which is used for communicating the space for accommodating the impeller in the shell with the flow channel and is in an annular space are arranged in the shell, and the flow channel is arranged around the impeller and is communicated with the air outlet.
Through adopting above-mentioned technical scheme, be close to the fixed guide plate that is thirty degrees contained angles with the shell inner wall that is provided with of impeller department on the inner wall of shell, can help improving process gas's the direction of admitting air, thereby help adjusting the entrance flow and reduce the emergence of surge, it is protruding to have the rhombus that sets up towards the pivot on the guide plate, can further avoid inside formation swirl, make the turbocompressor operation stable, turbocompressor's work efficiency has been improved, thereby the production speed of production industry nitrogen gas and oxygen in the whole technology has been improved, moreover, the steam generator is simple in structure and effective.
The invention is further configured to: the air cooling tower comprises a tower body, a fan arranged at the top of the tower body and an air guide device arranged on the outer wall of the bottom of the tower body and used for accelerating air guide, wherein the air guide device consists of a driving motor, a rotating shaft, a rotating disc and a plurality of arc-shaped blades which are arranged on the rotating disc at equal intervals along the circumference, vent openings are formed among the arc-shaped blades, one end of the rotating shaft is arranged on the output end of the driving motor, the other end of the rotating shaft is connected with the central position of the rotating disc, an air channel is longitudinally arranged on the outer wall of the tower body along the tower body, and the air inlet end of; the water cooling tower is characterized in that a plurality of uniformly arranged low-temperature water nozzles are arranged at the upper part of the tower body and are connected with a water collecting tank arranged at the bottom of the tower body through low-temperature water spraying pipelines, a water cooling tower and a first water pump are respectively connected in series on the low-temperature water spraying pipelines, and the first water pump is connected with a standby water pool through a water spraying pipe auxiliary pipe; the tower body middle part is provided with cooling water heat transfer subassembly, cooling water heat transfer subassembly is including setting up the heat exchange tube under a plurality of low temperature water nozzles, the heat exchange tube top is passed through the cooling water first circulating pipe and is connected with the air heat exchanger who sets up in the tower body outside, the inside heat exchange coil that is provided with of air heat exchanger, heat exchange coil one end is connected with the cooling water first circulating pipe, and the other end passes through the cooling water second circulating pipe and is connected bottom the heat exchange tube, be provided with the second suction pump on the cooling water second circulating pipe.
By adopting the technical scheme, under the combined action of the fan arranged at the top of the tower body and the air guide device arranged at the bottom of the tower body, the effect of doubling the air conveying efficiency and air circulation by mutual matching is achieved, the working efficiency of the air cooling tower is improved, meanwhile, the emission of heat absorbed by the air cooling tower is improved, under the action of the driving motor in the air guide device, the rotating shaft connected with the output end rotates and drives the rotating disc to rotate, a plurality of arc-shaped blades arranged on the rotating disc at equal intervals along the circumference play a role of guiding air entering from the bottom, and the outer wall of the tower body is matched with the arc-shaped blades to longitudinally arrange a ventilation channel along the tower body, the guided air is cooled and ventilated from the ventilation channel to the air cooling tower from bottom to top, so that the real-time cooling effect and the service time of the air cooling; the cooling water heat exchange assembly and the low-temperature water nozzle are arranged in the tower body and used for cooling and washing air entering the tower body, the low-temperature water sprayed out by the low-temperature water nozzle is sprayed onto the heat exchange tubes under the action of the first water pump, the heat exchange tubes are cooled, circulating cooling water in the heat exchange tubes is accelerated to be cooled, meanwhile, the air entering the tower body is cooled and washed, the low-temperature water finally falls into the water collecting tank, the low-temperature water absorbing heat is pumped into the water cooling tower and is reused after being cooled again, and the low-temperature water evaporated in the middle is pumped out of the standby water pool for supplement so as to prevent the insufficient cooling water and influence the normal use of the tower body; after the heat exchange of the cooling water in the heat exchange tube, the cooling water is cooled in the heat exchange coil from the cooling water first circulating tube to the heat exchanger under the action of the second water pump and then returns to the heat exchange tube from the cooling water second circulating tube after being cooled, the heat exchange coil has the effects of increasing the contact area with the outside air, physically cooling, accelerating the cooling while saving energy and improving the efficiency.
The invention is further configured to: the high-pressure air supply device comprises a high-pressure air supply pipe, one end of the high-pressure air supply pipe is arranged at the air outlet, the other end of the high-pressure air supply pipe is arranged at the bottom of the air cooling tower, an air flow sensor used for detecting the air flow rate inside the high-pressure air supply pipe is arranged on the inner wall of the high-pressure air supply pipe, an air control assembly used for controlling the air supply quantity is arranged on the high-pressure air supply pipe, the air control assembly comprises an air cylinder arranged on the outer wall of the high-pressure air supply pipe, the output end of the air cylinder is connected with a push rod, one end, far away from the air cylinder, of the push rod vertically penetrates through the pipe wall of the high-pressure.
By adopting the technical scheme, the high-pressure air supply device is arranged for accelerating the air transmission efficiency between the turbine compressor and the air cooling tower, meanwhile, a gas control component is arranged in the high-pressure gas supply pipe and is used for controlling the gas transmission amount in unit time, when the air quantity fed in unit time is too large and the air cooling tower can not be cooled in time, or when the air pressure in the high-pressure air feed pipe can not meet the requirement, the air flow sensor senses the air flow and then transmits an electric signal to the air cylinder, the air cylinder drives the push rod connected with the output end to control the distance between the push rod and the inner wall of the opposite side of the inner wall of the high-pressure air supply pipe so as to control the air delivery amount, thereby improving the cooling treatment quality of the air cooling tower while the whole conveying efficiency reaches the highest, thereby improving the integral production quality in the industrial oxygen and nitrogen production process and ensuring the production safety.
The invention is further configured to: the molecular sieve adsorber comprises a first tank body and a second tank body which are arranged at intervals, an air inlet pipe is arranged at the top of the first tank body, a first valve is arranged on the air inlet pipe, a gas outlet pipe is arranged at the top of the second tank body, the gas outlet pipe is provided with a second valve, the air inlet pipe and the gas outlet pipe are communicated with each other through a circulating pipe, a third valve is arranged on the circulating pipe, a first molecular sieve component and a second molecular sieve component for adsorption are respectively arranged in the first tank body and the second tank body, a first air outlet pipe is arranged at the bottom of the first tank body, a second air inlet pipe is arranged at the bottom of the second tank body, the first air outlet pipe and the second air inlet pipe are mutually communicated through a communicating pipe, a gas pump is arranged on the communicating pipe, and a fourth valve is arranged between the gas pump and the first air outlet pipe and positioned on the communicating pipe; the first molecular sieve component comprises a first upper molecular sieve and a first lower molecular sieve which are arranged in parallel at intervals up and down, and the surface molecular pore diameter of the first upper molecular sieve is larger than that of the first lower molecular sieve; the second molecular sieve component comprises a second upper molecular sieve and a second lower molecular sieve which are arranged in parallel at intervals from top to bottom, and the pore diameter of pores on the surface of the second upper molecular sieve is larger than that of pores on the surface of the second lower molecular sieve; the bottom of the first tank body and the bottom of the second tank body are respectively connected with a first dry hot steam inlet pipe and a second dry hot steam inlet pipe, and a fifth valve and a sixth valve are respectively arranged on the first dry hot steam inlet pipe and the second dry hot steam inlet pipe; the first tank body side wall and the second tank body side wall are respectively provided with a first hot steam outlet pipe and a second hot steam outlet pipe, the first hot steam outlet pipe is arranged above the first upper molecular sieve, the second hot steam outlet pipe is arranged above the second upper molecular sieve, and the first hot steam outlet pipe and the second hot steam outlet pipe are respectively provided with a seventh valve and an eighth valve.
By adopting the technical scheme, when the gas adsorption and filtration device works, the first valve opens air and enters the first tank body through the air inlet pipe, the air is adsorbed and filtered on the first molecular sieve component, the fourth valve is opened, the gas after adsorption and filtration enters the second tank body along the first air outlet pipe, the communicating pipe and the second air inlet pipe under the driving of the gas pump, the gas pump is arranged for accelerating the circulation speed of the gas between the first tank body and the second tank body and improving the transmission speed, the gas is adsorbed and filtered through the second molecular sieve component in the second tank body after entering the second tank body, the purity of the gas after adsorption and filtration is further ensured, meanwhile, when the gas enters the second tank body, the second molecular sieve component works, the first molecular sieve component in the first tank body can be regenerated, the adsorption efficiency is improved by the two components, after the gas in the second tank body is adsorbed and filtered twice, the third valve can be opened to lead the gas into the first tank body through the circulating pipe for multiple times of circulating adsorption so as to ensure the gas purity, the second valve can also be opened to discharge the gas from the gas outlet pipe, and the first tank body and the second tank body are circulated for multiple times and the molecular sieve works while being regenerated; the arrangement of the first upper molecular sieve and the first lower molecular sieve in the first tank body and the arrangement of the second upper molecular sieve and the second lower molecular sieve in the second tank body are used for strengthening the multiple adsorption and filtration of gas circulating mutually, meanwhile, the surface molecular pore diameter of the first upper molecular sieve is larger than that of the first lower molecular sieve, and the pore diameter of pores on the surface of the second upper molecular sieve is larger than that of pores on the surface of the second lower molecular sieve, so that the continuous purification is provided, the purity of the continuously adsorbed gas is ensured, and the structure is simple and reliable; after the gas after adsorption and filtration is conducted in the first tank body is guided into the second tank body, the fifth valve is opened to introduce dry hot steam into the first tank body to heat the first molecular sieve component to promote molecular sieve regeneration, the seventh valve is opened to lead out the blown hot steam from the first hot steam outlet pipe, when the second tank body is in a molecular sieve regeneration state, the sixth valve is opened to introduce dry hot steam into the second tank body to heat the second molecular sieve component to promote molecular sieve regeneration, and the eighth valve is opened to lead out the blown hot steam from the second hot steam outlet pipe.
The invention is further configured to: a high-speed gas transmission device for accelerating the transmission of clean air is arranged between the air cooling tower and the molecular sieve adsorber, the high-speed gas transmission device comprises a gas transmission pipeline, a drying plate for receiving and drying the clean air of the air cooling tower is arranged at one end port of the gas transmission pipeline, a clean air output pipeline connected with an air inlet pipe is arranged at the other end of the gas transmission pipeline, fan components for accelerating the gas transmission speed are respectively arranged in the gas transmission pipeline, each fan component comprises a first fan and a second fan, the first fans and the second fans are arranged in parallel and symmetrically at intervals, the driving directions of the first fans are opposite to those of the second fans, a temperature sensor for detecting the temperature of the air in real time is arranged on the inner wall of the gas transmission pipeline, and the temperature sensor is respectively electrically connected with the first fan and the second fan; the parcel is provided with the one deck zone of heating on the outer pipe wall of gas transmission pipeline, the zone of heating is inside to be provided with the warm water heat exchange tube around the even winding of outer pipe wall of gas transmission pipeline from the bottom up, the one end of warm water heat exchange tube is connected with the warm water that is used for leading-in warm water and advances the pipe, and the other end is connected with the warm water exit tube, the warm water advances to be provided with the warm water suction pump on managing, temperature-sensing ware and warm water suction.
By adopting the technical scheme, the high-speed gas transmission device is arranged for accelerating the transmission of clean air to the molecular sieve adsorber for purification, the port of the gas transmission pipeline is provided with the drying plate, the drying plate is used for receiving the clean air for pre-drying, and the drying plate can be replaced after absorbing some water for a period of time; under the action of the first fan and the second fan, clean air subjected to pre-drying is accelerated to pass through the air transmission pipeline, the driving direction of the first fan is opposite to that of the second fan, and the structure can double the circulation of the air in the same channel, so that the conveying efficiency is improved; the temperature sensor is arranged on the inner pipe wall of the gas transmission pipeline and used for detecting the air temperature in real time, when the temperature of the air passing through the air cooling tower is detected to be not at the required temperature, the temperature sensor transmits an electric signal to the first fan and the second fan to rotate at a reduced speed, so that the air is sufficiently cooled in the air cooling tower at the reduced speed, the purity of the produced industrial oxygen and nitrogen is ensured to reach the standard, the production quality is ensured in unit time, the production efficiency is further ensured, the air is subjected to pre-drying treatment, and the pressure of the molecular sieve adsorber is reduced; the effect of the warm water heat exchange tube of even winding from bottom to top on gas transmission pipeline outer pipe wall is, guarantee at air conveying's in-process, gas temperature after the air cooling tower cooling, not heat absorption is exchanged by gas transmission pipeline heat release, the temperature of warm water heat exchange tube is the same with the temperature of requirement, thereby guarantee gas conveying's quality, sense when gas transmission pipeline inside air temperature is not enough at temperature-sensing ware, or when the temperature-dependent temperature is too high, the work is accelerated to the warm water suction pump, the warm water that the extraction temperature is normal heats or cools down the processing to the air that intraductal high temperature or low excessively, the double-barrelling of cooperation first fan and second fan is together, control effect is better, simple structure is reliable.
The invention is further configured to: the pressure relief assembly is arranged on the high-pressure air supply pipe and used for pressure relief, the pressure relief assembly comprises a pressure relief pipe which is arranged on the high-pressure air supply pipe and communicated with the inside of the high-pressure air supply pipe, a control valve is arranged on the pressure relief pipe, and the air flow sensor is electrically connected with the control valve.
Through adopting above-mentioned technical scheme, inside at the high-pressure air supply pipe because the atmospheric pressure increase under the effect of accuse gas subassembly leads to the security to reduce, can detect back transmission signal of telecommunication to control flap through air mass flow sensor and open or close to play the normal state of assurance high-pressure air supply pipe inside atmospheric pressure, guarantee the security of equipment, safety in production.
The invention is further configured to: the pipe diameter of the gas transmission pipeline is gradually reduced from one end far away from the clean air outlet pipeline to the other end.
By adopting the technical scheme, the structure is used for accelerating and increasing the air input of the air from the air cooling tower to the molecular sieve adsorber, so that the flow of the air is conveniently controlled by matching with the high-pressure air supply pipe.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a process flow structure according to an embodiment of the present invention.
Fig. 2 is a schematic view of a configuration of a turbo compressor according to an embodiment of the present invention.
Fig. 3 is a schematic structural view of a high pressure gas supply apparatus according to an embodiment of the present invention.
FIG. 4 is a schematic view of an air cooling tower configuration according to an embodiment of the present invention.
FIG. 5 is a schematic view of a curved blade configuration for an air cooling tower according to an embodiment of the present invention.
FIG. 6 is a schematic diagram of a molecular sieve adsorber in accordance with an embodiment of the present invention.
FIG. 7 is a schematic structural diagram of a high-speed gas delivery device according to an embodiment of the present invention.
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.
As shown in fig. 1 to 7, the present invention discloses a process for producing industrial oxygen and nitrogen, which comprises the following steps:
1) the raw material air is passed through a self-cleaning air filter to remove dust and other mechanical impurities, and then is compressed by a raw material air turbine compressor to a pressure of 0.59MPa (A) and a temperature of 100 ℃;
2) compressed high-pressure air enters an air cooling tower for precooling, cooling water enters the air cooling tower in a section, circulating cooling water is arranged at the lower section and has the temperature of about 30-35 ℃, low-temperature water cooled by a water cooling tower is arranged at the upper section and has the temperature of about 8-15 ℃, the air passes through the air cooling tower from bottom to top for cooling and cleaning, and the temperature of the air is reduced to 18 ℃ after the air is cooled by the air cooling tower;
3) the cooled clean air enters a molecular sieve adsorber switched for use, and carbon dioxide, hydrocarbon and residual water vapor are adsorbed and removed;
4) the purified air is divided into three paths, and one path of the purified air enters a cold box of a fractionating tower after being pressurized by a pressurizing end of a pressurizing turboexpander; one path enters an instrument control system to be used as instrument gas; one path of air directly enters a cold box of a fractionating tower, the air exchanges heat with return gas (gas oxygen, gas nitrogen and waste nitrogen) in a main heat exchanger to reach the air liquefaction temperature of-175 ℃, and enters a lower tower of the cold box of the fractionating tower, 245780 Nm3/h of pressurized air is pumped out to enter a turbo expander for expansion and refrigeration when being cooled to-114 ℃ by the return cold gas in the main heat exchanger, and finally the pressurized air is sent to an upper tower 22960Nm3/h of the cold box of the fractionating tower;
5) in the lower tower of the cooling box of the fractionating tower, air is primarily separated into nitrogen and oxygen-enriched liquid air, the nitrogen at the top is liquefied in a main condensation evaporator, meanwhile, liquid oxygen at the low-pressure side of the main condensation evaporator is gasified, part of liquid nitrogen is taken as reflux liquid of the lower tower of the cooling box of the fractionating tower, the other part of liquid nitrogen is led out from the top of the lower tower of the cooling box of the fractionating tower, is supercooled by pure nitrogen and polluted nitrogen through a cooler and then is led into the top of an auxiliary tower of the upper tower of the cooling box of the fractionating tower through a throttle to be taken as reflux liquid, and the liquid air extracted from the bottom of the lower tower of the cooling box of the fractionating tower is supercooled in the subcooler and then;
6) the product oxygen is led out from the bottom of an upper tower of a fractionating tower cold box, is reheated by an expanded air heat exchanger and a main heat exchanger, then is discharged out of the fractionating tower cold box, is compressed by an oxygen turbine compressor and is sent to a user pipe network, the dirty nitrogen is led out from the upper tower part of the fractionating tower cold box, is reheated by a cooler and the main heat exchanger, is discharged out of the fractionating tower cold box, one part of the regenerated gas is used as a molecular sieve adsorber, the other part of the regenerated gas is discharged to a water cooling tower, the pure nitrogen is led out from the top of the upper tower of the fractionating tower cold box, is reheated in the subcooler and the main heat exchanger, is: the extraction flow is 30000Nm3/h, the extraction flow is sent to a water cooling tower, the rest is used as a nitrogen product, and the product liquid oxygen and the product liquid nitrogen are respectively sent to respective storage tanks through valves.
In the specific embodiment of the invention, in the step (3), two molecular sieve adsorbers are switched for use, wherein when one molecular sieve adsorber works, the other molecular sieve adsorber is regenerated, the switching period of the molecular sieve adsorber is 8 hours, and the molecular sieve adsorber is automatically switched at regular time.
By adopting the technical scheme, the industrial oxygen and nitrogen production process disclosed by the invention has the advantages that through reasonable equipment arrangement, pretreatment methods and equipment and reasonable process parameter design, the purity of the separated oxygen and nitrogen finished products is higher, the production efficiency is accelerated, and the requirements of industrial oxygen and nitrogen are completely met.
The invention also discloses a production line for the industrial oxygen and nitrogen production process, which comprises a self-cleaning air filter, a turbine compressor, an air cooling tower, a molecular sieve absorber, a main heat exchanger and a fractionating tower cold box which are sequentially connected, wherein the fractionating tower cold box comprises a fractionating tower cold box upper tower, a fractionating tower cold box lower tower and a fractionating tower cold box upper tower auxiliary tower, the fractionating tower cold box upper tower is respectively connected with a subcooler and an expanded air heat exchanger, the subcooler and the expanded air heat exchanger are both connected with the main heat exchanger, the main heat exchanger is respectively connected with an oxygen turbine compressor, a storage tank and a water cooling tower, the output end of the oxygen turbine compressor is connected with a user pipe network for leading to a user, the air cooling tower is connected with the water cooling tower through a low-temperature water inlet pipe, the fractionating tower cold box lower tower is connected with a main condensation evaporator, the main condensation evaporator is connected with the upper tower auxiliary tower of the fractionating tower cold box through the subcooler, one side of the upper tower of the fractionating tower cold box is provided with a turbine expander which is used for introducing pressurized air to the upper tower of the fractionating tower cold box after expansion, and the molecular sieve absorber is connected with the lower tower of the fractionating tower cold box through the turbine expander.
In the specific embodiment of the invention, the turbine compressor comprises a rotating shaft 1, an impeller 2 fixedly arranged at one end of the rotating shaft 1 and a shell 3, wherein the rotating shaft 1 and the impeller 2 are arranged inside the shell 3, the shell 3 is provided with an air inlet 4 and an air outlet 5, the air inlet 4 and the impeller 2 are coaxially arranged, a pair of guide plates 6 are fixedly arranged on the inner wall of the shell 3 close to the impeller 2, the guide plates 6 and the air inlet 4 are arranged on the same side surface of the shell 3, the pair of guide plates 6 are symmetrically arranged on the upper side and the lower side of the rotating shaft 1, the guide plates 6 are arranged to form a thirty-degree included angle with the inner wall of the shell 3, and diamond-shaped bulges 7 arranged towards the rotating shaft 1; the casing 3 is internally provided with a flow passage 8 and a diffuser 9 which is used for communicating the space for accommodating the impeller in the casing with the flow passage and is an annular space, and the flow passage 8 is arranged around the impeller 2 and is communicated with the air outlet 4.
Through adopting above-mentioned technical scheme, be close to impeller 2 fixed being provided with a pair of guide plate 6 that is thirty degrees contained angles with 3 inner walls of shell on the inner wall of shell 3, can help improving process gas's the direction of admitting air, thereby help adjusting the entrance flow and reduce the emergence of surge, there is the protruding 7 of rhombus towards pivot 1 setting on the guide plate 6, can further avoid inside formation swirl, make the turbocompressor operation stable, turbocompressor's work efficiency has been improved, thereby the production speed of production industry nitrogen gas and oxygen in the whole technology has been improved, moreover, the steam generator is simple in structure and effective.
In the specific embodiment of the present invention, the air cooling tower includes a tower body 11, a fan 12 disposed at the top of the tower body 11, and an air guide device disposed on the outer wall of the bottom of the tower body 11 and used for accelerating air guiding, the air guide device is composed of a driving motor 13, a rotating shaft 14, a rotating disk 15, and a plurality of arc-shaped blades 16 disposed on the rotating disk 15 at equal intervals along the circumference, a vent 17 is formed between the plurality of arc-shaped blades 16, one end of the rotating shaft 14 is disposed on the output end of the driving motor 13, the other end is connected with the center position of the rotating disk 15, an air duct 18 is disposed on the outer wall of the tower body 11 along the longitudinal direction of the tower body 11, and the air inlet; the upper part of the tower body 11 is provided with a plurality of uniformly arranged low-temperature water nozzles 19, the low-temperature water nozzles 19 are connected with a water collecting tank 21 arranged at the bottom of the tower body 11 through low-temperature water spraying pipelines 20, the low-temperature water spraying pipelines 20 are respectively connected with a water cooling tower 22 and a first water pump 23 in series, and the first water pump 23 is connected with a standby water pool 25 through a water spraying pipe auxiliary pipe 24; the tower body 11 middle part is provided with cooling water heat transfer subassembly, cooling water heat transfer subassembly is including setting up heat exchange tube 26 under a plurality of low temperature water nozzles 19, the heat exchange tube 26 top is passed through cooling water first circulating pipe 27 and is connected with the air heat exchanger 28 that sets up in the tower body 11 outside, the inside heat exchange coil 29 that is provided with of air heat exchanger 28, heat exchange coil 29 one end is connected with cooling water first circulating pipe 27, and the other end passes through cooling water second circulating pipe 30 and is connected bottom heat exchange tube 26, be provided with second suction pump 31 on the cooling water second circulating pipe 30.
By adopting the technical scheme, under the combined action of the fan 12 arranged at the top of the tower body 11 and the air guide device arranged at the bottom of the tower body 11, the effect of doubling the air conveying efficiency and the air circulation by mutually matching is achieved, the working efficiency of the air cooling tower is accelerated, accelerate the heat absorbed by the air cooling tower to be discharged, a rotating shaft 14 connected with the output end of the air guide device rotates and drives a rotating disc 15 to rotate under the action of a driving motor 13, a plurality of arc-shaped blades 16 arranged at equal intervals along the circumference on the rotating disc 15 play a role of guiding bottom air intake, an air duct 18 is arranged on the outer wall of the tower body 11 along the longitudinal direction of the tower body 11 in a manner of matching with the arc-shaped blades 16, and guided wind carries out cooling and ventilation treatment on the air cooling tower from bottom to top from the air duct 18, so that the real-time cooling effect and the service time of the air cooling tower are ensured; the cooling water heat exchange assembly and the low-temperature water nozzle 19 which are arranged inside the tower body 11 are used for cooling and washing air entering the tower body 11, under the action of the first water suction pump 23, the low-temperature water sprayed out through the low-temperature water nozzle 19 is sprayed onto the heat exchange tube 26, the heat exchange tube 26 is cooled, the circulating cooling water inside the heat exchange tube 26 is accelerated to be cooled, meanwhile, the air entering the tower body 11 is cooled and washed, the low-temperature water finally falls into the water collecting tank 21, the low-temperature water absorbing heat is pumped into the water cooling tower 22 and is reused after being cooled again, and the low-temperature water evaporated in the middle is pumped out of the standby water tank 25 for supplement, so that the situation that the cooling water is not enough is avoided, and the normal use of the tower body 11 is influenced; after heat exchange, cooling water in the heat exchange tube 26 is cooled in the heat exchange coil 29 of the heat exchanger 28 through the first cooling water circulation tube 27 under the action of the second water suction pump 31, and then returns to the heat exchange tube 26 from the second cooling water circulation tube 30 after cooling, wherein the heat exchange coil 29 is used for increasing the contact area with outside air, physical cooling is realized, energy is saved, cooling is accelerated, and efficiency is improved.
In a specific embodiment of the present invention, a high pressure air supply device is disposed between the turbine compressor and the air cooling tower, the high pressure air supply device includes a high pressure air supply pipe 41 having one end disposed at the air outlet 4, the other end of the high pressure air supply pipe 41 is disposed at the bottom of the air cooling tower, an air flow sensor 42 for detecting the flow rate of the air inside is disposed on the inner wall of the high pressure air supply pipe 41, an air control assembly for controlling the air supply amount is disposed on the high pressure air supply pipe 41, the air control assembly includes an air cylinder 43 disposed on the outer wall of the high pressure air supply pipe 41, the output end of the air cylinder 43 is connected to a push rod 44, one end of the push rod 44 away from the air cylinder 43 vertically penetrates through the wall of the high pressure air supply pipe 41 and extends into the high pressure.
By adopting the technical scheme, the high-pressure air supply device is arranged for accelerating the air transmission efficiency between the turbine compressor and the air cooling tower, meanwhile, a gas control component is arranged in the high-pressure gas supply pipe 41 and is used for controlling the gas transmission amount in unit time, when the air quantity fed in unit time is too large and the air cooling tower can not be cooled in time, or when the air pressure in the high-pressure air feed pipe 41 can not meet the requirement, the air flow sensor 42 senses the air flow and then transmits an electric signal to the air cylinder 43, the air cylinder 43 drives the push rod 44 connected with the output end, the distance between the push rod 44 and the inner wall of the opposite side of the inner wall of the high-pressure air supply pipe 41 is controlled, the air transmission amount is controlled, thereby improving the cooling treatment quality of the air cooling tower while the whole conveying efficiency reaches the highest, thereby improving the integral production quality in the industrial oxygen and nitrogen production process and ensuring the production safety.
In the embodiment of the present invention, the molecular sieve adsorber comprises a first tank 101 and a second tank 102 which are arranged at an interval, an air inlet pipe 103 is arranged on the top of the first tank 101, a first valve 104 is arranged on the air inlet pipe 103, a gas outlet pipe 109 is arranged on the top of the second tank 102, a second valve 111 is arranged on the gas outlet pipe 109, the air inlet pipe 103 and the gas outlet pipe 109 are communicated with each other through a circulation pipe 110, a third valve 112 is arranged on the circulation pipe 110, a first molecular sieve component and a second molecular sieve component for adsorption are respectively arranged inside the first tank 101 and inside the second tank 102, a first air outlet pipe 113 is arranged at the bottom of the first tank 101, a second air inlet pipe 117 is arranged at the bottom of the second tank 102, and the first air outlet pipe 113 and the second air inlet pipe 117 are communicated with each other through a communication pipe 114, a gas pump 115 is arranged on the communicating pipe 114, and a fourth valve 116 is arranged between the gas pump 115 and the first gas outlet pipe 113 and positioned on the communicating pipe 114; the first molecular sieve assembly comprises a first upper molecular sieve 105 and a first lower molecular sieve 106 which are arranged in parallel at intervals up and down, and the surface molecular pore size of the first upper molecular sieve 105 is larger than that of the first lower molecular sieve 106; the second molecular sieve component comprises a second upper molecular sieve 107 and a second lower molecular sieve 108 which are arranged in parallel at intervals up and down, and the pore diameter of pores on the surface of the second upper molecular sieve 107 is larger than that of pores on the surface of the second lower molecular sieve 108; the bottom of the first tank 101 and the bottom of the second tank 102 are respectively connected with a first dry hot steam inlet pipe 121 and a second dry hot steam inlet pipe 123, and a fifth valve 122 and a sixth valve 124 are respectively arranged on the first dry hot steam inlet pipe 121 and the second dry hot steam inlet pipe 123; a first hot steam outlet pipe 125 and a second hot steam outlet pipe 127 are respectively arranged on the side wall of the first tank body 101 and the side wall of the second tank body 102, the first hot steam outlet pipe 125 is arranged above the first upper molecular sieve 105, the second hot steam outlet pipe 127 is arranged above the second upper molecular sieve 107, and a seventh valve 126 and an eighth valve 128 are respectively arranged on the first hot steam outlet pipe 125 and the second hot steam outlet pipe 127.
By adopting the technical scheme, when the gas adsorption and filtration device works, the first valve 104 opens air, the air enters the first tank 101 through the air inlet pipe 103, the adsorption and filtration are carried out on the first molecular sieve component, the fourth valve 116 is opened, the gas after the adsorption and filtration is driven by the gas pump 115 to enter the second tank 102 along the first air outlet pipe 113, the communicating pipe 114 and the second air inlet pipe 117, the gas pump 115 is arranged for accelerating the circulation speed of the gas between the first tank 101 and the second tank 102 and improving the transmission rate, the gas enters the second tank 102 and then is adsorbed and filtered through the second molecular sieve component in the second tank 102, the purity of the gas after the adsorption and filtration is further ensured, meanwhile, when the gas enters the second tank 102, the second molecular sieve component works, the first molecular sieve component in the first tank 101 can be regenerated, and the adsorption efficiency is improved, after the gas in the second tank 102 is subjected to two times of adsorption filtration, the third valve 112 can be opened to introduce the gas into the first tank 101 through the circulation pipe 110 for multiple cycles of adsorption to ensure the gas purity, or the second valve 111 can be opened to discharge the gas from the gas outlet pipe 109, and the first tank 101 and the second tank 102 are subjected to multiple cycles and the molecular sieves work while being regenerated; the arrangement of the first upper molecular sieve 105 and the first lower molecular sieve 106 in the first tank 101 and the arrangement of the second upper molecular sieve 107 and the second lower molecular sieve 108 in the second tank 102 are used for enhancing the multiple adsorption filtration of the gas circulating mutually, meanwhile, the surface molecular pore diameter of the first upper molecular sieve 105 is larger than that of the first lower molecular sieve 106, and the pore diameter of the pores on the surface of the second upper molecular sieve 107 is larger than that of the pores on the surface of the second lower molecular sieve 108, so that the uninterrupted purification is provided, the purity of the continuously adsorbed gas is ensured, and the structure is simple and reliable; after the gas subjected to adsorption filtration in the first tank 101 is introduced into the second tank 102, the fifth valve 122 is opened to introduce dry hot steam into the first tank 101 to heat the first molecular sieve component to promote molecular sieve regeneration, the seventh valve 126 is opened to introduce blown hot steam from the first hot steam outlet pipe 125, when the second tank 102 is in a molecular sieve regeneration state, the sixth valve 124 is opened to introduce dry hot steam into the second tank 102 to heat the second molecular sieve component to promote molecular sieve regeneration, and the eighth valve 128 is opened to introduce blown hot steam from the second hot steam outlet pipe 127, so that the molecular sieve cyclic adsorption device with high molecular sieve regeneration speed is provided.
In the embodiment of the invention, a high-speed gas transmission device for accelerating the transmission of clean air is arranged between the air cooling tower and the molecular sieve adsorber, the high-speed gas transmission device comprises a gas transmission pipeline 51, a drying plate 52 for receiving and drying clean air of the air cooling tower is arranged at one end port of the gas transmission pipeline 51, a clean air outlet pipeline 53 connected with an air inlet pipe 103 is arranged at the other end of the gas transmission pipeline 51, the gas transmission pipeline 51 is internally provided with a fan assembly for accelerating the gas transmission speed, the fan assembly comprises a first fan 54 and a second fan 55, the first fan 54 and the second fan 55 are arranged in parallel and symmetrically at intervals, the driving direction of the first fan 54 is opposite to the driving direction of the second fan 55, a temperature sensor 56 for detecting the temperature of air in real time is arranged on the inner pipe wall of the gas transmission pipeline 51, and the temperature sensor 56 is electrically connected with the first fan 54 and the second fan 55 respectively; the parcel is provided with one deck zone of heating 57 on the outer pipe wall of gas transmission pipeline 51, zone of heating 57 is inside to be provided with warm water heat exchange tube 58 around the even winding of the outer pipe wall from the bottom up of gas transmission pipeline 51, the one end of warm water heat exchange tube 58 is connected with the warm water that is used for leading-in warm water and advances pipe 59, and the other end is connected with warm water exit tube 60, the warm water advances to be provided with warm water suction pump 61 on the pipe 59, temperature-sensing ware 56 and warm water suction pump 61 electricity are connected.
By adopting the technical scheme, the high-speed gas transmission device is arranged for accelerating the transmission of clean air to the molecular sieve adsorber for purification, the port of the gas transmission pipeline 51 is provided with the drying plate 52, the drying plate 52 is used for receiving the clean air for pre-drying, and the drying plate 52 can be replaced after absorbing some water for a period of time; under the action of the first fan 54 and the second fan 55, clean pre-dried air passes through the air transmission pipeline 51 at an accelerated speed, the driving direction of the first fan 54 is opposite to that of the second fan 55, and the structure can double the circulation of the air in the same channel, so that the transmission efficiency is improved; a temperature sensor 56 for detecting the air temperature in real time is arranged on the inner pipe wall of the gas transmission pipeline 51, when the temperature of the air passing through the air cooling tower is detected to be not reaching the required temperature, the temperature sensor 56 transmits an electric signal to the first fan 54 and the second fan 55 to rotate at a reduced speed, so that the air is sufficiently cooled in the air cooling tower at the reduced speed, the purity of the produced industrial oxygen and nitrogen is ensured to reach the standard, the production quality is ensured in unit time, the production efficiency is further ensured, the air is subjected to pre-drying treatment, and the pressure of the molecular sieve adsorber is reduced; the effect of the warm water heat exchange tube 58 of even winding from bottom to top on the outer pipe wall of gas transmission pipeline 51 is, guarantee at the in-process of carried air, gas temperature after the air cooling tower cooling, not by gas transmission pipeline 51 heat absorption heat exchange heat release, the temperature of warm water heat exchange tube 58 is the same with the temperature of requirement, thereby guarantee the quality of carried gas, sense when gas transmission pipeline 51 inside air temperature is not enough at temperature-sensing ware 56, or when the temperature is too high, warm water suction pump 61 accelerates work, the warm water that the extraction temperature is normal heats or cools down the processing to the air that intraductal high temperature or low excessively, cooperate the double-pipe of first fan 54 and second fan 55 under, control effect is better, and simple structure is reliable.
In a specific embodiment of the present invention, a pressure relief assembly for relieving pressure is disposed on the high-pressure air supply pipe 41, the pressure relief assembly includes a pressure relief pipe 45 disposed on the high-pressure air supply pipe 41 and communicated with the inside of the high-pressure air supply pipe 41, a control valve 46 is disposed on the pressure relief pipe 45, and the air flow sensor 42 is electrically connected to the control valve 46.
Through adopting above-mentioned technical scheme, the atmospheric pressure increase under the effect of accuse gas subassembly leads to the security to reduce inside high pressure air feed pipe 41, can open or close through air flow sensor 42 transmission signal of telecommunication to control valve 46 after detecting to play the state of guaranteeing that the inside atmospheric pressure of high pressure air feed pipe 41 is normal, guarantee the security of equipment, safety in production.
In the embodiment of the present invention, the diameter of the gas pipeline 51 gradually decreases from one end far away from the clean air outlet pipeline 53 to the other end.
By adopting the technical scheme, the structure is used for accelerating and increasing the air inflow of the air from the air cooling tower to the molecular sieve adsorber, so that the flow of the air is conveniently controlled by matching with the high-pressure air supply pipe 41.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (7)

1. The production line of the industrial oxygen and nitrogen production process is characterized by comprising the following steps: 1) the raw material air is passed through a self-cleaning air filter to remove dust and other mechanical impurities, and then is compressed by a raw material air turbine compressor to a pressure of 0.59MPa (A) and a temperature of 100 ℃; 2) the compressed high-pressure air enters an air cooling tower for precooling, the cooling water enters the air cooling tower in a section, the lower section is circulating cooling water with the temperature of about 30-35 ℃, the upper section is low-temperature water cooled by a water cooling tower with the temperature of about 8-15 ℃, the air passes through the air cooling tower from bottom to top for cooling and cleaning, and the temperature of the air is reduced to 18 ℃ after the air is cooled by the air cooling tower; 3) the cooled clean air enters a molecular sieve adsorber switched for use, and carbon dioxide, hydrocarbon and residual water vapor are adsorbed and removed; 4) the purified air is divided into three paths, and one path of the purified air enters a cold box of the fractionating tower after being pressurized by a pressurizing end of a pressurizing turboexpander; one path enters an instrument control system to be used as instrument gas; one path of the pressurized air directly enters a cold box of the fractionating tower, the air exchanges heat with the return gas in a main heat exchanger to reach the air liquefaction temperature of-175 ℃, and enters a lower tower of the cold box of the fractionating tower, and the 245780 Nm3/h pressurized air is pumped out to enter a turbo expander for expansion and refrigeration when being cooled to-114 ℃ by the return gas in the main heat exchanger, and finally is sent to an upper tower of the cold box of the fractionating tower at 22960Nm 3/h; 5) in the lower tower of the cooling box of the fractionating tower, air is primarily separated into nitrogen and oxygen-enriched liquid air, the nitrogen at the top is liquefied in a main condensation evaporator, meanwhile, liquid oxygen at the low-pressure side of the main condensation evaporator is gasified, part of liquid nitrogen is taken as reflux liquid of the lower tower of the cooling box of the fractionating tower, the other part of liquid nitrogen is led out from the top of the lower tower of the cooling box of the fractionating tower, is subcooled by pure nitrogen and waste nitrogen through a cooler and then is led into the top of an auxiliary tower of the upper tower of the cooling box of the fractionating tower through a throttling flow to be taken as reflux liquid, and the liquid air extracted from the bottom of the lower tower of the cooling box of the fractionating tower is subcooled in the subcooler and then; 6) the product oxygen is led out from the bottom of the upper tower part of the fractionating tower cold box, and is re-heated by the expanded air heat exchanger and the main heat exchanger to be discharged out of the fractionating tower cold box, and is compressed by the oxygen turbine compressor and sent to a user pipe network, the dirty nitrogen is led out from the upper tower part of the fractionating tower cold box, and is re-heated by the cooler and the main heat exchanger to be discharged out of the fractionating tower cold box, one part of the regenerated gas is taken as a molecular sieve adsorber, the other part of the regenerated gas is discharged to the water cooling tower, the pure nitrogen is led out from the upper tower top of the fractionating tower cold box, and is re-heated in the subcooler and the main heat: pumping the mixture with a flow rate of 30000Nm3/h into a water-cooling tower, taking the rest as nitrogen products, respectively feeding the product liquid oxygen and liquid nitrogen into respective storage tanks through valves, in the step (3), switching two molecular sieve adsorbers, wherein one molecular sieve adsorber is regenerated when working, the switching period of the molecular sieve adsorber is 8 hours, and the molecular sieve adsorber is automatically switched at regular time, and the molecular sieve adsorber further comprises a self-cleaning air filter, a turbine compressor, an air cooling tower, a molecular sieve adsorber, a main heat exchanger and a fractionating tower cold box which are sequentially connected, wherein the fractionating tower cold box comprises a fractionating tower cold box upper tower, a fractionating tower cold box lower tower and a fractionating tower cold box upper auxiliary tower, the fractionating tower cold box upper tower is respectively connected with a subcooler and an expanded air heat exchanger, the subcooler and the expanded air heat exchanger are both connected with the main heat exchanger, the main heat exchanger is respectively connected with an oxygen turbine compressor, a storage tank, the output end of the oxygen turbine compressor is connected with a user pipe network used for leading to a user, the air cooling tower is connected with a water cooling tower through a low-temperature water inlet pipe, a main condensation evaporator is connected on a lower tower of a cold box of the fractionating tower, the main condensation evaporator is connected with an upper auxiliary tower of the cold box of the fractionating tower through a subcooler, one side of the upper tower of the cold box of the fractionating tower is provided with a turbine expander used for introducing pressurized air to the upper tower of the cold box of the fractionating tower after expansion, the molecular sieve absorber is connected with the lower tower of the cold box of the fractionating tower through the turbine expander, the turbine compressor comprises a rotating shaft, an impeller and a shell, the impeller and the rotating shaft are fixedly arranged at one end of the rotating shaft, the rotating shaft and the impeller are arranged inside the shell, an air inlet and an air outlet are arranged on the shell, the air inlet and the impeller are coaxially, the guide plates and the air inlet are arranged on the same side face of the shell, the pair of guide plates are symmetrically arranged on the upper side and the lower side of the rotating shaft, the guide plates form an included angle of thirty degrees with the inner wall of the shell, and the guide plates are provided with rhombic bulges arranged towards the rotating shaft; the impeller is characterized in that a flow channel and a diffuser which is used for communicating the space for accommodating the impeller in the shell with the flow channel and is in an annular space are arranged in the shell, and the flow channel is arranged around the impeller and is communicated with the air outlet.
2. The production line of an industrial oxygen, nitrogen production process according to claim 1, characterized in that: the air cooling tower comprises a tower body, a fan arranged at the top of the tower body and an air guide device arranged on the outer wall of the bottom of the tower body and used for accelerating air guide, wherein the air guide device consists of a driving motor, a rotating shaft, a rotating disc and a plurality of arc-shaped blades which are arranged on the rotating disc at equal intervals along the circumference, vent openings are formed among the arc-shaped blades, one end of the rotating shaft is arranged on the output end of the driving motor, the other end of the rotating shaft is connected with the central position of the rotating disc, an air channel is longitudinally arranged on the outer wall of the tower body along the tower body, and the air inlet end of; the water cooling tower is characterized in that a plurality of uniformly arranged low-temperature water nozzles are arranged at the upper part of the tower body and are connected with a water collecting tank arranged at the bottom of the tower body through low-temperature water spraying pipelines, a water cooling tower and a first water pump are respectively connected in series on the low-temperature water spraying pipelines, and the first water pump is connected with a standby water pool through a water spraying pipe auxiliary pipe; the tower body middle part is provided with cooling water heat transfer subassembly, cooling water heat transfer subassembly is including setting up the heat exchange tube under a plurality of low temperature water nozzles, the heat exchange tube top is passed through the cooling water first circulating pipe and is connected with the air heat exchanger who sets up in the tower body outside, the inside heat exchange coil that is provided with of air heat exchanger, heat exchange coil one end is connected with the cooling water first circulating pipe, and the other end passes through the cooling water second circulating pipe and is connected bottom the heat exchange tube, be provided with the second suction pump on the cooling water second circulating pipe.
3. The production line of an industrial oxygen, nitrogen production process according to claim 2, characterized in that: the high-pressure air supply device comprises a high-pressure air supply pipe, one end of the high-pressure air supply pipe is arranged at the air outlet, the other end of the high-pressure air supply pipe is arranged at the bottom of the air cooling tower, an air flow sensor used for detecting the air flow rate inside the high-pressure air supply pipe is arranged on the inner wall of the high-pressure air supply pipe, an air control assembly used for controlling the air supply quantity is arranged on the high-pressure air supply pipe, the air control assembly comprises an air cylinder arranged on the outer wall of the high-pressure air supply pipe, the output end of the air cylinder is connected with a push rod, one end, far away from the air cylinder, of the push rod vertically penetrates through the pipe wall of the high-pressure.
4. The production line of industrial oxygen and nitrogen production process according to claim 3, characterized in that: the molecular sieve adsorber comprises a first tank body and a second tank body which are arranged at intervals, an air inlet pipe is arranged at the top of the first tank body, a first valve is arranged on the air inlet pipe, a gas outlet pipe is arranged at the top of the second tank body, the gas outlet pipe is provided with a second valve, the air inlet pipe and the gas outlet pipe are communicated with each other through a circulating pipe, a third valve is arranged on the circulating pipe, a first molecular sieve component and a second molecular sieve component for adsorption are respectively arranged in the first tank body and the second tank body, a first air outlet pipe is arranged at the bottom of the first tank body, a second air inlet pipe is arranged at the bottom of the second tank body, the first air outlet pipe and the second air inlet pipe are mutually communicated through a communicating pipe, a gas pump is arranged on the communicating pipe, and a fourth valve is arranged between the gas pump and the first air outlet pipe and positioned on the communicating pipe; the first molecular sieve component comprises a first upper molecular sieve and a first lower molecular sieve which are arranged in parallel at intervals up and down, and the surface molecular pore diameter of the first upper molecular sieve is larger than that of the first lower molecular sieve; the second molecular sieve component comprises a second upper molecular sieve and a second lower molecular sieve which are arranged in parallel at intervals from top to bottom, and the pore diameter of pores on the surface of the second upper molecular sieve is larger than that of pores on the surface of the second lower molecular sieve; the bottom of the first tank body and the bottom of the second tank body are respectively connected with a first dry hot steam inlet pipe and a second dry hot steam inlet pipe, and a fifth valve and a sixth valve are respectively arranged on the first dry hot steam inlet pipe and the second dry hot steam inlet pipe; the first tank body side wall and the second tank body side wall are respectively provided with a first hot steam outlet pipe and a second hot steam outlet pipe, the first hot steam outlet pipe is arranged above the first upper molecular sieve, the second hot steam outlet pipe is arranged above the second upper molecular sieve, and the first hot steam outlet pipe and the second hot steam outlet pipe are respectively provided with a seventh valve and an eighth valve.
5. The production line of an industrial oxygen, nitrogen production process according to claim 4, characterized in that: a high-speed gas transmission device for accelerating the transmission of clean air is arranged between the air cooling tower and the molecular sieve adsorber, the high-speed gas transmission device comprises a gas transmission pipeline, a drying plate for receiving and drying the clean air of the air cooling tower is arranged at one end port of the gas transmission pipeline, a clean air output pipeline connected with an air inlet pipe is arranged at the other end of the gas transmission pipeline, fan components for accelerating the gas transmission speed are respectively arranged in the gas transmission pipeline, each fan component comprises a first fan and a second fan, the first fans and the second fans are arranged in parallel and symmetrically at intervals, the driving directions of the first fans are opposite to those of the second fans, a temperature sensor for detecting the temperature of the air in real time is arranged on the inner wall of the gas transmission pipeline, and the temperature sensor is respectively electrically connected with the first fan and the second fan; the parcel is provided with the one deck zone of heating on the outer pipe wall of gas transmission pipeline, the zone of heating is inside to be provided with the warm water heat exchange tube around the even winding of outer pipe wall of gas transmission pipeline from the bottom up, the one end of warm water heat exchange tube is connected with the warm water that is used for leading-in warm water and advances the pipe, and the other end is connected with the warm water exit tube, the warm water advances to be provided with the warm water suction pump on managing, temperature-sensing ware and warm water suction.
6. The production line of an industrial oxygen, nitrogen production process according to claim 5, characterized in that: the pressure relief assembly is arranged on the high-pressure air supply pipe and used for pressure relief, the pressure relief assembly comprises a pressure relief pipe which is arranged on the high-pressure air supply pipe and communicated with the inside of the high-pressure air supply pipe, a control valve is arranged on the pressure relief pipe, and the air flow sensor is electrically connected with the control valve.
7. The production line of an industrial oxygen, nitrogen production process according to claim 5, characterized in that: the pipe diameter of the gas transmission pipeline is gradually reduced from one end far away from the clean air outlet pipeline to the other end.
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CN111336769A (en) * 2020-03-16 2020-06-26 嘉兴市加宇电器科技有限公司 High-efficient type air separation equipment
CN112460916B (en) * 2020-11-24 2022-03-29 辽宁帅兴气体有限责任公司 High-efficiency industrial oxygen generation system and oxygen generation process
CN116712828B (en) * 2023-05-23 2023-12-26 山东众海机械有限公司 Equipment for purifying nitrogen under high-pressure state

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0697576A1 (en) * 1994-08-17 1996-02-21 The Boc Group, Inc. Air separation method and apparatus
CN1423108A (en) * 2001-10-04 2003-06-11 林德股份公司 Technology and apparatus producing high-purity nitrogen through low-temp. air fraction distilation
CN101738059A (en) * 2009-12-22 2010-06-16 四川空分设备(集团)有限责任公司 Method for reducing comprehensive energy consumption of air separation
CN102721263A (en) * 2012-07-12 2012-10-10 杭州杭氧股份有限公司 System and method for separating air by utilizing cryogenic cooling technology
CN105466154A (en) * 2015-12-21 2016-04-06 七台河宝泰隆煤化工股份有限公司 Air separation technique
CN106123489A (en) * 2016-06-29 2016-11-16 苏州制氧机股份有限公司 A kind of mixing column method for producing oxygen through

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0697576A1 (en) * 1994-08-17 1996-02-21 The Boc Group, Inc. Air separation method and apparatus
CN1423108A (en) * 2001-10-04 2003-06-11 林德股份公司 Technology and apparatus producing high-purity nitrogen through low-temp. air fraction distilation
CN101738059A (en) * 2009-12-22 2010-06-16 四川空分设备(集团)有限责任公司 Method for reducing comprehensive energy consumption of air separation
CN102721263A (en) * 2012-07-12 2012-10-10 杭州杭氧股份有限公司 System and method for separating air by utilizing cryogenic cooling technology
CN105466154A (en) * 2015-12-21 2016-04-06 七台河宝泰隆煤化工股份有限公司 Air separation technique
CN106123489A (en) * 2016-06-29 2016-11-16 苏州制氧机股份有限公司 A kind of mixing column method for producing oxygen through

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