CN215951957U - Deoxidation device for waste nitrogen in air separation device - Google Patents

Deoxidation device for waste nitrogen in air separation device Download PDF

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Publication number
CN215951957U
CN215951957U CN202122390460.8U CN202122390460U CN215951957U CN 215951957 U CN215951957 U CN 215951957U CN 202122390460 U CN202122390460 U CN 202122390460U CN 215951957 U CN215951957 U CN 215951957U
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nitrogen
tee joint
combustion
deaerator
valve
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袁红玲
金启明
李红明
刘欣
龚普勤
陈新兴
王明飞
刘芳芝
陈中华
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Henan Xinlianxin Chemicals Group Co Ltd
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Henan Xinlianxin Chemicals Group 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
    • F25J3/04636—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 using a hybrid air separation unit, e.g. combined process by cryogenic separation and non-cryogenic separation techniques
    • 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
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/82—Processes or apparatus using other separation and/or other processing means using a reactor with combustion or catalytic reaction
    • 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
    • F25J2215/00—Processes characterised by the type or other details of the product stream
    • F25J2215/42—Nitrogen or special cases, e.g. multiple or low purity N2
    • F25J2215/44—Ultra high purity nitrogen, i.e. generally less than 1 ppb impurities
    • 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
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/42—Processes or apparatus involving steps for increasing the pressure of gaseous process streams the fluid being nitrogen

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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)

Abstract

The utility model relates to a deoxidation device for waste nitrogen in an air separation device; the device comprises a waste nitrogen compressor connected with an air separation device, wherein the waste nitrogen compressor is connected with a nitrogen storage tank through a pre-deoxidation unit and a nitrogen dehydration separation unit; a first tee joint is arranged between the waste nitrogen compressor and the pre-deoxidation unit and is connected with a hydrogen supply device through a first hydrogen supplement pipeline; the method has the advantages of small investment and land occupation, short construction period, large nitrogen yield and high product purity, can effectively improve the utilization rate of nitrogen, meet the defect of shortage of nitrogen products of the air separation device brought by development in a park, can meet the purification treatment of polluted nitrogen with oxygen content not greater than 3%, and is suitable for large-scale popularization and application.

Description

Deoxidation device for waste nitrogen in air separation device
Technical Field
The utility model relates to the technical field of waste nitrogen purification, in particular to a deoxidation device for waste nitrogen in an air separation device.
Background
Air separation plants are widely used in the fields of conventional metallurgy, coal chemical industry, petrochemical industry, nitrogen fertilizer industry, professional gas companies, etc., and products of air separation plants include oxygen, nitrogen, argon, etc., wherein nitrogen products are often used as synthetic raw materials, purging nitrogen, replacing nitrogen, protecting nitrogen, etc., and are typical public engineering gases. The nitrogen product produced by an air separation plant shaped in a park tends to be constant, and with the development of the park, the demand of other plants on the nitrogen product will be more and more, resulting in the deficiency of the nitrogen product of the air separation plant. There are several methods for producing nitrogen products, such as: cryogenic air separation plants, PSA nitrogen generators, membrane nitrogen generation, and the like. The air separation device has the advantages in large-scale, oxygen, argon and the like can be obtained, but the investment, the construction period and the occupied area are large, and the air separation device is not suitable for the condition that a new nitrogen product is required independently; the PSA nitrogen making machine has relatively less investment and small occupied area, but the scale is small, and if the nitrogen yield of a single set of nitrogen making machine is less than 3000Nm3H; the application of membrane nitrogen production is less, the quality of a membrane separation component is limited, and the purity of nitrogen can not be ensured.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the utility model provides a deoxygenation device for waste nitrogen in an air separation device, which is based on the existing air separation device, realizes the effective removal of oxygen in waste nitrogen by distributing hydrogen of the waste nitrogen, has the advantages of small investment and land occupation, short construction period, large nitrogen yield and high product purity, and can effectively solve the problem of shortage of nitrogen products of the air separation device caused by the development of a park.
In order to achieve the purpose, the utility model adopts the technical scheme that:
a deoxidation device for waste nitrogen in an air separation device comprises a waste nitrogen compressor connected with the air separation device, wherein the waste nitrogen compressor is connected with a nitrogen storage tank through a pre-deoxidation unit and a nitrogen dehydration separation unit; a first tee joint is arranged between the waste nitrogen compressor and the pre-deoxidation unit and connected with a hydrogen supply device through a first hydrogen supplement pipeline.
Preferably, the pre-deoxidation unit comprises a near-path pipeline with a near-path valve and a combustion deaerator connected with the near-path pipeline in series.
Preferably, the pre-deoxidation unit further comprises a steam heater arranged between the first tee joint and the combustion deaerator and connected with the near pipeline in parallel.
Preferably, a connecting pipeline with an eleventh valve is arranged between the pre-deoxidation unit and the nitrogen dehydration separation unit, a second tee joint and a third tee joint are respectively arranged at two ends of the connecting pipeline, and a series-parallel connection type deep deoxidation unit is arranged between the third end of the second tee joint and the third end of the third tee joint.
Preferably, the series-parallel connection type deep deoxidation unit comprises a pre-reactor cooler connected with the third end of the second tee joint, and the outlet end of the pre-reactor cooler is connected with the third end of the third tee joint through a first combustion deaerator and a second combustion deaerator which are connected in parallel.
Preferably, the pre-deoxidation unit and the second tee joint are connected with a hydrogen supply device through a second hydrogen supplement pipeline.
Preferably, the outlet end of the first combustion deaerator is provided with a fourth tee joint, the inlet end of the second combustion deaerator is provided with a fifth tee joint, and the third end of the fourth tee joint is connected with the third end of the fifth tee joint through a first valve, a serial cooler, a sixth tee joint and a second valve; and the third end of the sixth tee joint is connected with a hydrogen supply device through a third hydrogen supplement pipeline.
Preferably, a third valve and a fourth valve are respectively and correspondingly arranged between the outlet end of the pre-reactor cooler and the first combustion deaerator and the second combustion deaerator; a fifth valve and a sixth valve are respectively and correspondingly arranged between the first combustion deaerator and the second combustion deaerator and the third end of the third tee joint; and the first hydrogen supplementing pipeline, the second hydrogen supplementing pipeline and the third hydrogen supplementing pipeline are respectively provided with a seventh valve, an eighth valve and a ninth valve.
Preferably, the nitrogen dehydration separation unit comprises a reactor condenser, the reactor condenser is connected with an inlet for water separation, and a gas phase outlet of the water separator is connected with a nitrogen storage tank through a drying device; and a liquid phase outlet of the water separator is connected with the water storage tank through a tenth valve.
According to the deoxidation device for the waste nitrogen in the air separation device, which is manufactured according to the scheme, the oxygen in the combustion deaerator can be removed from the waste nitrogen by arranging the hydrogen supplementing pipeline to be mixed with the waste nitrogen, so that the aim of purifying the waste nitrogen is fulfilled; further, through setting up cluster parallel connection formula degree of depth deoxidation unit, and cooperate with basic deoxidation unit in advance, can in time adjust the process line according to the difference of oxygen content in the dirty nitrogen gas in the actual process, in order to reach the purpose that satisfies different oxygen content dirty nitrogen gas, and the effectual purity of guaranteeing nitrogen gas in the product gas, it is little to have the investment occupation of land, construction period is short, nitrogen gas output is big, product purity is high, not only can effectively improve the utilization ratio of nitrogen gas and satisfy the defect that the air separation device nitrogen gas product is in short supply that the garden brought because of the development, and can satisfy the purification treatment that oxygen content is not more than 3% dirty nitrogen gas, and be applicable to large-scale popularization and application.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1: the utility model relates to a deoxidation device for waste nitrogen in an air separation device, which comprises a waste nitrogen compressor 1 connected with the air separation device, wherein the waste nitrogen compressor 1 is connected with a nitrogen storage tank 22 through a pre-deoxidation unit and a nitrogen dehydration separation unit; a first tee joint 28 is arranged between the waste nitrogen compressor 1 and the pre-deoxidation unit, and the first tee joint 28 is connected with the hydrogen supply device 23 through a first hydrogen supplement pipeline 24. The utility model compresses the polluted nitrogen, mixes hydrogen after compression, and consumes and removes oxygen in the polluted nitrogen through the pre-deoxidation unit so as to achieve the purpose of purifying the polluted nitrogen; and (4) subsequently dehydrating and separating the deoxidized nitrogen and then recovering the nitrogen. The hydrogen supply device 23 of the present invention may be a hydrogen storage tank, a hydrogen production device, a hydrogen pipe network, or the like.
Further, the pre-deoxidation unit comprises a near-path pipeline with a near-path valve 34 and a combustion deaerator 3 connected with the near-path pipeline in series. The pre-deoxidation unit also comprises a steam heater 2 which is arranged between the first tee joint 28 and the combustion deaerator 3 and is connected with the near pipeline in parallel. The connection relationship between the steam heater 2 and the near pipeline is parallel connection, namely a sewage nitrogen heating mode or a sewage nitrogen non-heating mode can be adopted after hydrogen is supplemented, the key point of whether the sewage nitrogen is heated is whether the temperature of the sewage nitrogen entering the combustion deaerator 3 can reach 100 ℃, when the temperature of the sewage nitrogen entering the combustion deaerator 3 reaches 100 ℃, the sewage nitrogen can directly enter the combustion deaerator 3 through the near pipeline, and when the temperature of the sewage nitrogen entering the combustion deaerator 3 is lower than 100 ℃, the sewage nitrogen enters the combustion deaerator 3 after being heated by the steam heater 2.
Furthermore, a connecting pipeline with an eleventh valve 21 is arranged between the pre-deoxidation unit and the nitrogen dehydration separation unit, a second tee joint 29 and a third tee joint 30 are respectively arranged at two ends of the connecting pipeline, and a series-parallel connection type deep deoxidation unit is arranged between the third end of the second tee joint 29 and the third end of the third tee joint 30. The utility model can adapt to the purification treatment of the polluted nitrogen with the oxygen content not more than 3 percent, and when the oxygen content in the polluted nitrogen is not more than 1 percent, the nitrogen which passes through the combustion deaerator 3 can directly enter the nitrogen dehydration separation unit; when the oxygen content in the polluted nitrogen is more than 1 percent and not more than 3 percent, the polluted nitrogen needs to be deeply matched with hydrogen and deoxidized through the serial-parallel deep deoxidizing unit after passing through the combustion deaerator 3.
Further, the series-parallel connection type deep deoxidation unit comprises a pre-reactor cooler 4 connected with the third end of the second tee joint 29, and the outlet end of the pre-reactor cooler 4 is connected with the third end of the third tee joint 30 through a first combustion deaerator 5 and a second combustion deaerator 6 which are connected in parallel.
Further, the pre-deoxidation unit and the second tee 29 are connected with the hydrogen supply device 23 through a second hydrogen supply pipeline 25. When the oxygen content in the polluted nitrogen is more than 1% and not more than 2%, the polluted nitrogen needs to pass through a pre-reactor cooler 4 and a first combustion deaerator 5 and a second combustion deaerator 6 which are connected in parallel after passing through a combustion deaerator 3 so as to achieve the purposes of deep deoxidization of the polluted nitrogen and improvement of the treatment capacity of the polluted nitrogen; when the polluted nitrogen enters the first combustion deaerator 5 or the second combustion deaerator 6, hydrogen is distributed through the second hydrogen supplementing pipeline 25.
Furthermore, a fourth tee joint 31 is arranged at the outlet end of the first combustion deaerator 5, a fifth tee joint 32 is arranged at the inlet end of the second combustion deaerator 6, and the third end of the fourth tee joint 31 is connected with the third end of the fifth tee joint 32 through the first valve 14, the serial cooler 16, the sixth tee joint 33 and the second valve 15; the third end of the sixth tee 33 is connected to the hydrogen supply device 23 through the third hydrogen replenishment pipe 26. When the oxygen content in the polluted nitrogen is more than 3% and not more than 3%, the polluted nitrogen sequentially passes through the first combustion deaerator 5 and the second combustion deaerator 6 after passing through the combustion deaerator 3 and the pre-reactor cooler 4, so that the aim of deeply deoxidizing the polluted nitrogen is fulfilled; the hydrogen is distributed by a second hydrogen supplementing pipeline 25 before the polluted nitrogen enters the first combustion deaerator 5, and the hydrogen is distributed by a third hydrogen supplementing pipeline 26 before the polluted nitrogen enters the second combustion deaerator 6. A third valve 10 and a fourth valve 11 are respectively and correspondingly arranged between the outlet end of the pre-reactor cooler 4 and the first combustion deaerator 5 and the second combustion deaerator 6; a fifth valve 12 and a sixth valve 13 are respectively and correspondingly arranged between the first combustion deaerator 5 and the second combustion deaerator 6 and the third end of the third tee joint 30. The first hydrogen supplementing pipeline 24, the second hydrogen supplementing pipeline 25 and the third hydrogen supplementing pipeline 26 are respectively provided with a seventh valve 17, an eighth valve 18 and a ninth valve 19. The above arrangement can achieve the purpose of convenient control and convenient hydrogen distribution.
Further, the nitrogen dehydration separation unit comprises a reactor condenser 7, the reactor condenser 7 is connected with an inlet of a water separator 8, and a gas phase outlet of the water separator 8 is connected with a nitrogen storage tank 22 through a drying device 9; the liquid phase outlet of the water separator 8 is connected to a water reservoir 27 via a tenth valve 20. The utility model realizes the cooling of the reactor by the condenser 7 of the reactor, separates the water and the air by the water separator 8, and removes the water carried in the nitrogen by the drying device 9 after the separation.
A deoxidation purification process of a deoxidation device for waste nitrogen in an air separation device is characterized in that the deoxidation purification process is a deoxidation purification method with different paths according to the oxygen content of the waste nitrogen in the air separation device, and comprises a low-oxygen-content waste nitrogen purification method, a medium-oxygen-content waste nitrogen purification method and a high-oxygen-content waste nitrogen purification method;
in the method for purifying the low-oxygen-content polluted nitrogen, the oxygen content in the polluted nitrogen is as follows: x is more than or equal to 0.2 and less than or equal to 1 percent, and the oxygen content in the polluted nitrogen in the method for purifying the polluted nitrogen with the medium oxygen content is as follows: y is more than 1 and less than or equal to 2 percent, and the oxygen content in the polluted nitrogen in the high-oxygen-content polluted nitrogen purification method is as follows: z is more than 2 and less than or equal to 3 percent;
the method for purifying the low-oxygen-content polluted nitrogen comprises the following steps:
step 1: the oxygen content of the waste nitrogen from the air separation device is X, the pressure is 5KPa, the temperature is normal temperature, the waste nitrogen at normal temperature and normal pressure is pressurized to 3.0MPa by a waste nitrogen compressor 1, the temperature is raised, and the waste nitrogen is mixed with the hydrogen from the outside;
step 2: the hydrogen flow is controlled by a seventh valve 17 to be constant, and the mixed gas enters the combustion deaerator 3 through the steam heater 2 or a near pipeline;
and step 3: all oxygen is consumed by the reaction in the combustion deaerator 3; the temperature of the polluted nitrogen passing through the combustion deaerator 3 is 310 ℃, and the oxygen content is less than or equal to 10 ppm;
and 4, step 4: the nitrogen deoxidized by the combustion deaerator 3 enters the reactor condenser 7 through a connecting pipeline with an eleventh valve 21, and the temperature is reduced to 40 ℃;
and 5: the cooled material passing through the reactor condenser 7 is subjected to water separator 8 to separate reaction water, and the separated gas enters drying device 9 to dry and remove other saturated water to produce qualified nitrogen;
step 6: the reaction water separated by the water separator 8 enters the water storage tank 27 through the tenth valve 20;
when the temperature of the waste nitrogen passing through the waste nitrogen compressor 1 in the step 1 is raised to be not lower than 100 ℃, the mixed gas in the step 2 enters a combustion deaerator 3 through a near pipeline; when the temperature of the waste nitrogen passing through the waste nitrogen compressor 1 rises to be lower than 100 ℃, the gas mixed in the step 2 is heated to be not lower than 100 ℃ by the steam heater 2 and then enters the combustion deaerator 3;
the ratio of the hydrogen flow passing through the seventh valve 17 in the step 2 to the flow of the waste nitrogen from the air separation device in the step 1 is as follows: 11-12: 500, a step of;
secondly, the method for purifying the waste nitrogen with medium oxygen content comprises the following steps:
step 1: the oxygen content of the waste nitrogen from the air separation device is Y, the pressure is 5KPa, the temperature is normal temperature, the waste nitrogen is pressurized to 2.0MPa by a waste nitrogen compressor 1, the temperature is raised, and the waste nitrogen is mixed with the hydrogen from the outside;
step 2: the hydrogen flow is controlled by a seventh valve 17 to be constant, and the mixed gas enters the combustion deaerator 3 through the steam heater 2 or a near pipeline;
and step 3: one fourth of oxygen in the polluted nitrogen is consumed in the combustion deaerator 3, and the temperature of the polluted nitrogen passing through the combustion deaerator 3 is 200 ℃;
and 4, step 4: the waste nitrogen reacted by the combustion deaerator 3 is mixed with the hydrogen from the eighth valve 18 and enters the pre-reactor cooler 4, and the temperature of the cooled waste nitrogen is reduced to 40 ℃;
and 5: the cooled waste nitrogen respectively passes through a first combustion deaerator 5 and a second combustion deaerator 6, residual oxygen is respectively reacted in the first combustion deaerator 5 and the second combustion deaerator 6, the temperature after reaction is 280 ℃, and the oxygen content is less than or equal to 10 ppm;
step 6: the nitrogen passing through the first combustion deaerator 5 and the second combustion deaerator 6 enters a reactor condenser 7, and the temperature is reduced to 40 ℃;
and 7: the cooled material passing through the reactor condenser 7 is subjected to water separator 8 to separate reaction water, and the separated gas enters drying device 9 to dry and remove other saturated water to produce qualified nitrogen;
and 8: the reaction water separated by the water separator 8 enters the water storage tank 27 through the tenth valve 20;
when the temperature of the waste nitrogen passing through the waste nitrogen compressor 1 in the step 1 is raised to be not lower than 100 ℃, the mixed gas in the step 2 enters a combustion deaerator 3 through a near pipeline; when the temperature of the waste nitrogen passing through the waste nitrogen compressor 1 rises to be lower than 100 ℃, the gas mixed in the step 2 is heated to be not lower than 100 ℃ by the steam heater 2 and then enters the combustion deaerator 3;
the ratio of the hydrogen flow passing through the seventh valve 17 in the step 2 to the flow of the waste nitrogen from the air separation device in the step 1 is as follows: 11-12: 1000, parts by weight;
the ratio of the hydrogen flow rate through the eighth valve 18 in the step 4 to the waste nitrogen flow rate from the air separation device in the step 1 is as follows: 34-35: 1000, parts by weight;
thirdly, the purification method of the waste nitrogen with high oxygen content comprises the following steps:
step 1: the oxygen content of the waste nitrogen from the air separation device is Z, the pressure is 5KPa, the temperature is normal temperature, the waste nitrogen at normal temperature and normal pressure is pressurized to 0.5MPa by a waste nitrogen compressor 1, the temperature is raised, and the waste nitrogen is mixed with the hydrogen from the outside;
step 2: the hydrogen flow is controlled by a seventh valve 17 to be constant, and the mixed gas enters the combustion deaerator 3 through the steam heater 2 or a near pipeline;
and step 3: one sixth of the total oxygen content in the waste nitrogen is consumed in the combustion deaerator 3, and the temperature of the waste nitrogen passing through the combustion deaerator 3 is 180 ℃;
and 4, step 4: the waste nitrogen reacted by the combustion deaerator 3 is mixed with the hydrogen from the second hydrogen supplementing pipeline 25 and the eighth valve 18 and enters the pre-reactor cooler 4, and the temperature of the cooled waste nitrogen is reduced to 40 ℃;
and 5: the waste nitrogen after being cooled in the step 4 enters a first combustion deaerator 5 through a third valve 10 to be subjected to catalytic combustion deaerating, and one third of the total oxygen content in the waste nitrogen is consumed; the temperature of the polluted nitrogen passing through the first combustion deaerator 5 is 200 ℃;
step 6: the waste nitrogen passing through the first combustion deaerator 5 sequentially passes through the first valve 14 and the serial cooler 16 to be mixed with the hydrogen supplemented from the third hydrogen supplementing pipeline 26, the mixed gas enters the second combustion deaerator 6 through the second valve 15 and the fifth tee 32, all oxygen in the waste nitrogen is consumed through catalytic combustion deaerating, the temperature of the nitrogen after reaction is 280 ℃, and the oxygen content is less than or equal to 10 ppm;
and 7: the nitrogen passing through the second combustion deoxygenator 6 enters the reactor condenser 7, and the temperature is reduced to 40 ℃;
and 8: the cooled material passing through the reactor condenser 7 is subjected to water separator 8 to separate reaction water, and the separated gas enters drying device 9 to dry and remove other saturated water to produce qualified nitrogen;
and step 9: the reaction water separated by the water separator 8 enters the water storage tank 27 through the tenth valve 20;
when the temperature of the waste nitrogen passing through the waste nitrogen compressor 1 in the step 1 is raised to be not lower than 100 ℃, the mixed gas in the step 2 enters a combustion deaerator 3 through a near pipeline; when the temperature of the waste nitrogen passing through the waste nitrogen compressor 1 rises to be lower than 100 ℃, the gas mixed in the step 2 is heated to be not lower than 100 ℃ by the steam heater 2 and then enters the combustion deaerator 3;
the ratio of the hydrogen flow passing through the seventh valve 17 in the step 2 to the flow of the waste nitrogen from the air separation device in the step 1 is as follows: 5-6: 500, a step of;
the ratio of the hydrogen flow rate through the eighth valve 18 in the step 4 to the waste nitrogen flow rate from the air separation device in the step 1 is as follows: 11-12: 500, a step of;
the ratio of the hydrogen flow rate supplemented through the third hydrogen supplementing pipeline 26 in the step 6 to the flow rate of the waste nitrogen from the air separation device in the step 1 is as follows: 33-35: 1000.
it should be noted that, in the above embodiment, the seventh valve 17, the eighth valve 18 and the ninth valve 19 are used to control the hydrogen flow entering the system through the corresponding first hydrogen make-up pipe 24, the second hydrogen make-up pipe 25 and the third hydrogen make-up pipe 26, and the hydrogen flow path can be adjusted according to the oxygen content in the polluted nitrogen and the position of each combustion deaerator, and its main purpose is to ensure that each combustion deaerator achieves the reaction effect of removing the oxygen content as required. The utility model is based on the existing air separation device, and has the advantages of less investment, simple process, high product yield, high product purity and the like in the nitrogen product increment polluted nitrogen deoxidation process route compared with the existing nitrogen product increment technology, thereby effectively solving the increment requirement of the existing chemical industry park development on nitrogen products.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (9)

1. The utility model provides a dirty nitrogen among air separation plant is with deoxidation device, includes dirty nitrogen compressor (1) that links to each other with air separation plant, its characterized in that: the waste nitrogen compressor (1) is connected with a nitrogen storage tank (22) through a pre-deoxidation unit and a nitrogen dehydration separation unit;
a first tee joint (28) is arranged between the waste nitrogen compressor (1) and the pre-deoxidation unit, and the first tee joint (28) is connected with a hydrogen supply device (23) through a first hydrogen supplement pipeline (24).
2. The deoxidation apparatus for dirty nitrogen in an air separation plant according to claim 1, characterized in that: the pre-deoxidation unit comprises a near pipeline with a near valve (34) and a combustion deaerator (3) connected with the near pipeline in series.
3. The deoxidation apparatus for dirty nitrogen in an air separation plant according to claim 2, characterized in that: the pre-deoxidation unit further comprises a steam heater (2) which is arranged between the first tee joint (28) and the combustion deaerator (3) and is connected with the near pipeline in parallel.
4. The deoxidation apparatus for dirty nitrogen in an air separation plant according to claim 1, characterized in that: and a connecting pipeline with an eleventh valve (21) is arranged between the pre-deoxidation unit and the nitrogen dehydration separation unit, a second tee joint (29) and a third tee joint (30) are respectively arranged at two ends of the connecting pipeline, and a series-parallel connection type deep deoxidation unit is arranged between the third end of the second tee joint (29) and the third end of the third tee joint (30).
5. The apparatus for deoxidizing a waste nitrogen gas in an air separation plant according to claim 4, wherein: the series-parallel connection type deep deoxidation unit comprises a pre-reactor cooler (4) connected with a third end of a second tee joint (29), and an outlet end of the pre-reactor cooler (4) is connected with a third end of a third tee joint (30) through a first combustion deaerator (5) and a second combustion deaerator (6) which are connected in parallel.
6. The apparatus for deoxidizing a waste nitrogen gas in an air separation plant according to claim 4, wherein: the pre-deoxidation unit and the second tee joint (29) are connected with a hydrogen supply device (23) through a second hydrogen supplement pipeline (25).
7. The apparatus for deoxidizing a waste nitrogen gas in an air separation plant according to claim 5, wherein: a fourth tee joint (31) is arranged at the outlet end of the first combustion deaerator (5), a fifth tee joint (32) is arranged at the inlet end of the second combustion deaerator (6), and the third end of the fourth tee joint (31) is connected with the third end of the fifth tee joint (32) through a first valve (14), a serial cooler (16), a sixth tee joint (33) and a second valve (15);
the third end of the sixth tee joint (33) is connected with the hydrogen supply device (23) through a third hydrogen replenishing pipeline (26).
8. The apparatus for deoxidizing a waste nitrogen gas in an air separation plant according to claim 5, wherein: a third valve (10) and a fourth valve (11) are respectively and correspondingly arranged between the outlet end of the pre-reactor cooler (4) and the first combustion deaerator (5) and the second combustion deaerator (6); a fifth valve (12) and a sixth valve (13) are respectively and correspondingly arranged between the first combustion deaerator (5) and the second combustion deaerator (6) and the third end of the third tee joint (30);
the first hydrogen supplementing pipeline (24), the second hydrogen supplementing pipeline (25) and the third hydrogen supplementing pipeline (26) are respectively provided with a seventh valve (17), an eighth valve (18) and a ninth valve (19).
9. The apparatus for deoxidizing a dirty nitrogen gas in an air separation plant according to any one of claims 1 to 8, wherein: the nitrogen dehydration separation unit comprises a reactor condenser (7), the reactor condenser (7) is connected with an inlet of a water separator (8), and a gas phase outlet of the water separator (8) is connected with a nitrogen storage tank (22) through a drying device (9); and a liquid phase outlet of the water separator (8) is connected with a water storage tank (27) through a tenth valve (20).
CN202122390460.8U 2021-09-29 2021-09-29 Deoxidation device for waste nitrogen in air separation device Active CN215951957U (en)

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