CN108380001B - Storage tank area protection nitrogen recycling system and method - Google Patents
Storage tank area protection nitrogen recycling system and method Download PDFInfo
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- CN108380001B CN108380001B CN201810439105.5A CN201810439105A CN108380001B CN 108380001 B CN108380001 B CN 108380001B CN 201810439105 A CN201810439105 A CN 201810439105A CN 108380001 B CN108380001 B CN 108380001B
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 353
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 174
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000004064 recycling Methods 0.000 title claims abstract description 22
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 42
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 40
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 40
- 238000001179 sorption measurement Methods 0.000 claims abstract description 40
- 239000007789 gas Substances 0.000 claims abstract description 22
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 238000006392 deoxygenation reaction Methods 0.000 claims abstract description 5
- 230000001105 regulatory effect Effects 0.000 claims description 39
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 32
- 239000001301 oxygen Substances 0.000 claims description 32
- 229910052760 oxygen Inorganic materials 0.000 claims description 32
- 230000020335 dealkylation Effects 0.000 claims description 18
- 238000006900 dealkylation reaction Methods 0.000 claims description 18
- 239000003463 adsorbent Substances 0.000 claims description 13
- 230000003009 desulfurizing effect Effects 0.000 claims description 13
- 239000006096 absorbing agent Substances 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N activated carbon Substances [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- 238000011069 regeneration method Methods 0.000 claims description 8
- 230000003584 silencer Effects 0.000 claims description 7
- 238000003795 desorption Methods 0.000 claims description 6
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000002808 molecular sieve Substances 0.000 claims description 5
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- -1 activated carbon hydrocarbon Chemical class 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 14
- 238000010521 absorption reaction Methods 0.000 abstract description 8
- 238000006477 desulfuration reaction Methods 0.000 abstract description 6
- 230000023556 desulfurization Effects 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000001035 drying Methods 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract description 2
- 238000002347 injection Methods 0.000 abstract description 2
- 239000007924 injection Substances 0.000 abstract description 2
- 239000013589 supplement Substances 0.000 abstract description 2
- 230000018044 dehydration Effects 0.000 abstract 1
- 238000006297 dehydration reaction Methods 0.000 abstract 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 230000003197 catalytic effect Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000009841 combustion method Methods 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000002250 absorbent Substances 0.000 description 3
- 230000002745 absorbent Effects 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 125000001997 phenyl group Chemical class [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- UBAZGMLMVVQSCD-UHFFFAOYSA-N carbon dioxide;molecular oxygen Chemical compound O=O.O=C=O UBAZGMLMVVQSCD-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 238000005984 hydrogenation reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 150000003568 thioethers Chemical class 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/047—Pressure swing adsorption
- B01D53/0476—Vacuum pressure swing adsorption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/30—Controlling by gas-analysis apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/10—Single element gases other than halogens
- B01D2257/104—Oxygen
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/702—Hydrocarbons
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Separation Of Gases By Adsorption (AREA)
Abstract
The invention discloses a recycling system and a recycling method for nitrogen protection in a storage tank area, which aim at discharging polluted nitrogen components in the storage tank area, adopt a combined technology of absorption desulfurization, cooling and drying, dehydration, vacuum pressure swing adsorption hydrocarbon removal and pressure swing adsorption deoxygenation treatment and a sectional injection nitrogen protection safety control technology, respectively obtain high-concentration hydrocarbon organic matters and industrial gaseous nitrogen with 99 percent (V percent) purity, the high-concentration hydrocarbon organic matters can be safely utilized, the nitrogen with 99 percent (V percent) purity is used as the nitrogen protection in the storage tank area for recycling, and a nitrogen protection pipe network in the storage tank area only needs to supplement a small amount of pure nitrogen, so that the nitrogen protection system in the storage tank area can work effectively. The invention can be arranged on site in a tank area, and can be operated under full-automatic linkage control, thereby greatly reducing the nitrogen consumption and the gas discharge of the storage and transportation tank area of enterprises, and having remarkable economic and social benefits.
Description
Technical Field
The invention relates to an oil gas recovery treatment method generated in the oil storage and transportation process, in particular to a storage tank area protection nitrogen recovery treatment recycling system and method.
Background
The storage tank area in petrochemical industry has large occupied area, a large number of storage tanks and a large variety of stored materials, the maximum number of the storage tanks is a normal pressure (micro-internal pressure) fixed top tank, and the storage tanks are provided with an inner floating disc tank, a vault tank and the like, so that the storage tank is the largest atmospheric pollutant for enterprisesThe method is characterized in that the method is an unorganized emission source, is also an important safety control area of enterprises, and petrochemical enterprises implement nitrogen sealing on the normal pressure storage tanks capable of implementing nitrogen protection in order to maintain the gas phase space oxygen concentration in the normal pressure storage tanks to be not more than 5%, eliminate explosion conditions and prevent storage tank explosion accidents from happening due to the concept of intrinsic safety management of storage tank areas. From the field investigation of petrochemical enterprise storage and transportation tank areas, 100000m 3 The total tank capacity of the nitrogen protection can reach 2000Nm 3 And/h, the nitrogen seal valve is frequently and easily damaged, the tripping and falling actions of the breathing valve are not timely, so that VOCs-containing nitrogen (hereinafter referred to as polluted nitrogen) in the storage tank is continuously discharged, and the condition of the rapid increase of the nitrogen consumption is protected. At present, the protection nitrogen for the storage tank of petrochemical enterprises is uniformly produced by an air separation device, and pure nitrogen with the purity of not less than 99.99 percent (V percent) is produced according to the standard of the design Specification of nitrogen oxygen System (SH/T3106) of petrochemical enterprises so as to meet the use requirement of the production device, wherein the calculated value of pure nitrogen energy is 0.15kg of standard oil/Nm 3 The method comprises the steps of carrying out a first treatment on the surface of the And the industrial gaseous nitrogen with purity not lower than 99% (V%) can be used for protecting nitrogen of the normal pressure storage tank, and the prior art combination can meet the requirement of low-cost treatment of the polluted nitrogen discharged by the storage tank so as to produce the protecting nitrogen of the storage tank.
The polluted nitrogen components discharged from various storage tanks in the storage tank areas of petrochemical enterprises contain hydrocarbons, benzene series, sulfides, water vapor, air and the like, and the adopted oil gas treatment technical methods comprise a condensation method, an absorption method, an adsorption method, a membrane method, a combustion method and a combination of a plurality of methods. Based on the existing harshness of atmospheric pollutant emission standard and comprehensive consideration of factors such as oil gas recovery value and oil gas recovery operation cost, the tail end treatment of the polluted nitrogen discharged by the petrochemical enterprise storage and transportation tank area is mostly treated by adopting a combustion method (such as a direct flame combustion method, a thermal combustion method, a catalytic oxidation method, a thermal storage oxidation method and the like) and then discharged after reaching standards, so that the nitrogen is protected by the storage and transportation tank area to be disposable, the operation cost of an owner is ultrahigh, and meanwhile, the thermal nitrogen oxide polluted atmosphere is extremely easy to generate by high-concentration nitrogen combustion treatment.
The technology of purifying and recycling the polluted nitrogen by adopting a hydrogenation catalytic deoxidization reaction method-adsorption purification method or a carbon-supported catalytic deoxidization reaction method-adsorption purification method is found in the industries of steel, electronics, chemical industry and the like through search; the industrial gas technology includes pressure swing adsorption process for purifying hydrogen, purifying methane, purifying carbon dioxide, recovering oil gas, producing nitrogen, producing oxygen, etc. At present, the adoption of the sewage nitrogen discharged in the oil product storage system is not found: the integrated technology of absorption method sulfur removal-freezing method water removal-vacuum pressure swing adsorption method hydrocarbon removal-pressure swing adsorption method deoxidation treatment and recycling is used as storage tank nitrogen protection.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: at present, no technology for recycling the discharged polluted nitrogen in the storage tank area is provided, and a storage tank area protection nitrogen recycling system and method are provided.
The invention solves the technical problems through the following technical scheme that the invention comprises a compressor, a cooler, a desulfurizing tower, a cold dryer, a dealkylation adsorber, a vacuum pump, a deoxidization adsorber, a silencer, a nitrogen tank and a fine filter; the inlet of the compressor is connected with the dirty nitrogen discharge main pipe of the storage tank area, the outlet of the compressor is connected with the inlet of the cooler, the outlet of the cooler is connected to the dirty nitrogen inlet at the lower part of the desulfurizing tower, the outlet at the upper part of the desulfurizing tower is connected with the inlet of the cold dryer, the outlet of the cold dryer is connected to the inlet main pipe inlet of the dealkylation adsorber, the outlet of the outlet main pipe of the dealkylation adsorber is connected with the inlet main pipe inlet of the deoxygenation adsorber, the outlet of the desorption main pipe of the dealkylation adsorber is connected with the inlet of the vacuum pump, the outlet of the desorption main pipe of the deoxygenation adsorber is connected with the inlet of the silencer, the outlet of the nitrogen tank is connected to the inlet of the fine filter, and the outlet of the fine filter is connected with the storage tank area protection nitrogen pipeline.
A first oxygen content analyzer and a factory pure nitrogen pipeline are sequentially arranged between a pipeline at the inlet of the compressor and a dirty nitrogen discharge main pipe of the storage tank area, a first regulating valve is arranged on the factory pure nitrogen pipeline, and an output signal of the first oxygen content analyzer is connected to the first regulating valve.
A second oxygen content analyzer is arranged between the outlet of the cold dryer and the inlet of the inlet manifold of the dealkylation adsorber, the factory pure nitrogen pipeline is connected to the inlet manifold of the dealkylation adsorber, a second regulating valve is arranged on the factory pure nitrogen pipeline, and an output signal of the second oxygen content analyzer is connected to the second regulating valve.
The outlet of the fine filter and the storage tank area protection nitrogen pipeline are sequentially provided with a third regulating valve and a pressure transmitter, the plant area pure nitrogen pipeline is connected to the storage tank area protection nitrogen pipeline, the plant area pure nitrogen pipeline is provided with a fourth regulating valve, and output signals of the pressure transmitter are respectively connected to the third regulating valve and the fourth regulating valve.
The hydrocarbon removal adsorber comprises at least two hydrocarbon removal adsorption towers which are arranged in parallel, and silica gel and activated carbon hydrocarbon removal adsorbents are filled in the hydrocarbon removal adsorption towers from bottom to top.
The deoxidization adsorber comprises at least two deoxidization adsorption towers which are arranged in parallel, deoxidization adsorbent is filled in the deoxidization adsorption towers, and the deoxidization adsorbent is a carbon molecular sieve.
The using method of the storage tank area protection nitrogen recycling system comprises the following steps:
(1) Pure nitrogen is supplemented into a dirty nitrogen discharge header pipe at the inlet of the compressor, and the oxygen content in the dirty nitrogen is controlled to be lower than 5 percent (V%);
(2) Cooling the polluted nitrogen gas to below 45 ℃ and then desulfurizing;
(3) Cooling the polluted nitrogen to 2-4 ℃ and removing water and C in the polluted nitrogen 6 The above hydrocarbon components;
(4) Pure nitrogen is supplemented into an air inlet main pipe of the hydrocarbon removal adsorber, and the oxygen content in the polluted nitrogen is controlled to be lower than 5 percent (V percent);
(5) The hydrocarbon removal adsorption tower performs adsorption-regeneration automatic switching operation, a vacuum pump vacuumizes the regenerated hydrocarbon removal adsorption tower to desorb organic matters of hydrocarbon removal adsorbent, and the resolved gas is recycled or incinerated;
(6) The deoxidization adsorption tower performs adsorption-regeneration automatic switching operation, and the gas in the regenerated deoxidization adsorption tower is exhausted to normal pressure;
(7) The pressure of the nitrogen stored in the nitrogen tank is not lower than the use pressure of the nitrogen protected in the storage tank area, the third regulating valve is controlled by the output signal of the pressure transmitter to ensure that the pressure of the nitrogen protected in the storage tank area reaches the use pressure, and when the pressure of the nitrogen protected in the storage tank area cannot reach the use pressure, the pure nitrogen is supplemented to the nitrogen protected in the storage tank area by the fourth regulating valve to reach the use pressure.
Compared with the prior art, the invention has the following advantages: aiming at the aim of recycling the polluted nitrogen discharged by the storage and transportation tank area as storage tank protection nitrogen, the invention adopts the mature combined technology of desulfurization by an absorption method, dealkylation by vacuum pressure swing adsorption and deoxidation by pressure swing adsorption, and sectional treatment to respectively obtain high-concentration hydrocarbon organic matters and storage tank protection nitrogen with 99 percent purity; the high-concentration hydrocarbon organic matters do not contain harmful components such as sulfur, oxygen and the like, can be safely reused as high-quality raw materials, and 99% (V%) pure nitrogen is used as the protective nitrogen of the storage tank area for recycling, and the nitrogen protection system of the storage tank area can work only by supplementing a small amount of pure nitrogen to the protective nitrogen pipe network of the storage tank area. Compared with the existing oil gas treatment technology, the invention greatly reduces the gas emptying amount and the pure nitrogen consumption after treatment, obviously reduces the comprehensive operation cost of owners and has remarkable social benefit.
The invention adopts the combination technology of the absorption method, the cooling and drying method and the adsorption method, and the automatic control technology of the sectional nitrogen injection safety protection, effectively prevents unsafe factors such as high temperature, explosion and the like from happening, and compared with the technology of purifying and recycling the polluted nitrogen by the hydrogenation catalytic deoxidization reaction method-the adsorption purification method or the carbon-supported catalytic deoxidization reaction method-the adsorption purification method, the invention has no consumption of hydrogen, carbon, catalyst and the like, and also has no high temperature reaction process and complex safety control system, and the invention has intrinsic safety and greatly reduces the requirement on the safety distance between the polluted nitrogen and an oil tank.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
in the figure: arrows indicate media flow direction; the thick solid lines represent equipment and piping; the dashed line represents the meter signal line.
Detailed Description
The following describes in detail the examples of the present invention, which are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of protection of the present invention is not limited to the following examples.
As shown in fig. 1, the embodiment processes the polluted nitrogen discharged by the storage tank, achieves the storage tank protection nitrogen use standard (industrial gaseous nitrogen) for petrochemical enterprises, and uses 99.99% pure nitrogen produced by the air separation units of the enterprises as the supplementary nitrogen of the storage tank.
The embodiment comprises a compressor 1, a cooler 2, a desulfurizing tower 3, a cold dryer 4, a hydrocarbon removal adsorber 5, a vacuum pump 6, a deoxidizing adsorber 7, a silencer 8, a nitrogen tank 9 and a fine filter 10; the inlet of the compressor 1 is connected with the dirty nitrogen discharge main pipe 11 of the storage tank area, the outlet of the compressor 1 is connected with the inlet of the cooler 2, the outlet of the cooler 2 is connected with the dirty nitrogen inlet at the lower part of the desulfurizing tower 3, the outlet at the top of the desulfurizing tower 3 is connected with the inlet of the cold dryer 4, the outlet of the cold dryer 4 is connected with the inlet of the air inlet main pipe at the lower part of the deoiling adsorber 5, the outlet of the air outlet main pipe at the top of the deoiling adsorber 5 is connected with the inlet of the air inlet main pipe at the lower part of the deoxidizing adsorber 7, the outlet of the analytic air main pipe at the lower part of the deoiling adsorber 5 is connected with the inlet of the vacuum pump 6, and the outlet of the vacuum pump 6 is preferentially connected with the fuel gas pipe network 14 at the factory area; the outlet of the lower part analysis gas main pipe of the deoxidization absorber 7 is connected with the inlet of the silencer 8, the outlet of the top gas main pipe of the deoxidization absorber 7 is connected with the inlet of the nitrogen tank 9, the upper outlet of the nitrogen tank 9 is connected with the inlet of the fine filter 10, and the outlet of the fine filter 10 is connected with the storage tank area protection nitrogen pipeline 13.
The pipeline from the tank farm sewage nitrogen discharging main pipe 11 to the inlet of the compressor 1 is sequentially provided with an online first oxygen content analyzer 21 and a factory pure nitrogen pipeline 12, a first regulating valve 22 is arranged on the factory pure nitrogen pipeline 12, and an output signal of the first oxygen content analyzer 21 is connected with the first regulating valve 22.
The pipeline from the outlet of the cold dryer 4 to the inlet of the inlet manifold at the lower part of the hydrocarbon removal adsorber 5 is sequentially provided with an online second oxygen content analyzer 23 and a factory pure nitrogen pipeline 12, a second regulating valve 24 is arranged on the factory pure nitrogen pipeline 12, and the output signal of the second oxygen content analyzer 23 is connected with the second regulating valve 24.
The third regulating valve 26, the factory pure nitrogen pipeline 12 and the pressure transmitter 25 are sequentially arranged on the pipeline from the outlet of the fine filter 10 to the storage tank area protection nitrogen, the fourth regulating valve 27 is arranged on the factory pure nitrogen pipeline 12, and the output signal of the pressure transmitter 25 is connected with the third regulating valve 26 and the fourth regulating valve 27.
The specific working procedure of this embodiment is as follows:
the dirty nitrogen gas discharged by the storage tank area is collected in a closed mode through a dirty nitrogen discharge main pipe 11 of the storage tank area and is sent to an inlet of a compressor 1, a first oxygen content analyzer 21 is arranged on the dirty nitrogen discharge main pipe 11 of the storage tank area, when the oxygen content exceeds 5% (V%), a first regulating valve 22 arranged on a factory pure nitrogen pipeline 12 is controlled to be opened by an output signal of the first oxygen content analyzer 21, 99.99% (V%) pure nitrogen is supplemented into the dirty nitrogen discharge main pipe, when the oxygen content reaches 5% (V%), the first regulating valve 22 is controlled to be closed by an output signal of the first oxygen content analyzer 21, the combustion condition of the discharged gas of the storage tank area is eliminated, and the safe operation of a subsequent dirty nitrogen treatment facility is guaranteed.
The polluted nitrogen is boosted to the set pressure of 0.5MPa by the compressor 1 and enters the cooler 2, a circulating cooling water tube bundle is arranged in the cooler 2, and the cooler 2 cools the high Wen Wu nitrogen gas generated by the compressor 1 to below 45 ℃ and then enters the lower part of the desulfurizing tower 3; the desulfurization tower 3 is preferably a packed tower, dirty nitrogen is in contact mass transfer with a desulfurizing agent from the upper part of the desulfurization tower 3 from bottom to top, sulfide in the dirty nitrogen is removed, and the desulfurized dirty nitrogen is sent to the cold dryer 4 from the top of the desulfurization tower 3. The cold dryer 4 is complete equipment, and consists of a refrigerant circulating compressor, an evaporator, a vapor-liquid separator and the like, and the polluted nitrogen is cooled to 2-4 ℃ by the cold dryer 4 to remove water and C in the polluted nitrogen 6 The hydrocarbon components make the state of the polluted nitrogen entering the hydrocarbon removal adsorber 5 stable, and the low-temperature polluted nitrogen is beneficial to improving the adsorption rate and the adsorption quantity of the hydrocarbon removal adsorbent. The pipeline from the outlet of the cold dryer 4 to the dealkylation adsorber 5 is provided with a second oxygen content analyzer 23, when the oxygen content exceeds 5% (V%), the output signal of the second oxygen content analyzer 23 controls a second regulating valve 24 arranged on the factory pure nitrogen pipeline 12 to supplement 99.99% (V%) pure nitrogen into the pipelineWhen the oxygen content reaches 5% (V%), the second oxygen content analyzer 23 outputs a signal to control the second regulating valve 24 to be closed, so as to eliminate unsafe factors of increasing the oxygen content of the gas caused by the processes of desulfurization, cooling and drying and expanding the explosive concentration range of the oxygen-containing explosive gas caused by the subsequent process of adsorption and heating.
The hydrocarbon removal absorber 5 is composed of at least two hydrocarbon removal absorption towers connected in parallel, a valve, an automatic control system and the like, the hydrocarbon removal absorption tower wheel flow carries out absorption-regeneration automatic switching operation, the hydrocarbon removal absorption tower is filled with hydrocarbon removal absorbent such as silica gel, active carbon and the like from bottom to top, the hydrocarbon removal absorbent selectively absorbs organic matters such as hydrocarbon and benzene series and the like including methane in the polluted nitrogen gas, and the nitrogen gas and the oxygen gas can pass through the hydrocarbon removal absorbent layer; the adsorption process can release heat, when the adsorption of the dealkylation adsorbent reaches a certain saturation degree, the adsorption operation is automatically switched to the vacuum desorption regeneration operation, the vacuum pump 6 vacuumizes the regenerated dealkylation adsorber 5 to below 10kPa of absolute atmospheric pressure, organic components such as hydrocarbon in the dealkylation adsorbent are desorbed, the resolved gas does not contain organic matters of sulfide and air components, and the dealkylation adsorbent is a high-quality chemical raw material and safe and clean fuel, the resolved gas discharged by the vacuum pump 6 is preferably boosted to 0.2MPa, and is sent to an oil refining production device for recycling or used as fuel gas, and is discharged into a torch system 15 for incineration treatment to reach standard and discharge when recycling is difficult. The vacuum pressure swing adsorption separation technology is widely applied to petrochemical industry, such as coalbed methane pressure swing adsorption deoxidation technology and the like.
The gas components passing through the dealkylation absorber 5 and the dealkylation absorber layer mainly comprise nitrogen and oxygen, and enter the deoxidation absorber 7 through a pipeline, the deoxidation absorber 7 is composed of at least two deoxidation absorbing towers connected in parallel, a valve, an automatic control system and the like, the deoxidation absorbing towers alternately perform adsorption-regeneration switching operation, the deoxidation absorbing towers are filled with absorbers, the absorbers are preferably carbon molecular sieves, oxygen, carbon dioxide and trace moisture are absorbed by the carbon molecular sieves, and nitrogen flows out from the top of the deoxidation absorber 7 through the carbon molecular sieve absorber layer. When the adsorbent is adsorbed to reach a certain saturation degree, the adsorption operation is automatically switched to the desorption regeneration operation, namely the pressure of the regenerated deoxidization adsorption tower is quickly reduced to normal pressure, so that oxygen, carbon dioxide and trace moisture adsorbed by carbon molecules are released, and the carbon molecules are safely exhausted through the silencer 8. The pressure swing adsorption nitrogen production technology is widely applied, the purity of the produced industrial gaseous nitrogen is generally not lower than 98.5% (V%), and the storage tank is preferably protected by the nitrogen in the embodiment with 99% (V%).
The nitrogen flowing out from the top of the deoxidizing adsorber 7 is fed into the nitrogen tank 9 to be stored and used as protection nitrogen in a storage tank area, the storage temperature of the nitrogen tank 9 is normal temperature, the pressure is not lower than 0.3MPa, an outlet at the upper part of the nitrogen tank 9 is connected with an inlet of the fine filter 10, the fine filter 10 is used for filtering particles with the diameter of more than 0.01 mu m, an outlet of the fine filter 10 is connected with a storage tank area protection nitrogen pipeline 13, a third regulating valve 26, a factory pure nitrogen pipeline 12 and a pressure transmitter 25 are arranged on the storage tank area protection nitrogen pipeline 13, a fourth regulating valve 27 is arranged on the factory pure nitrogen pipeline 12, an output signal of the pressure transmitter 25 is connected with the third regulating valve 26 and the fourth regulating valve 27, the pressure transmitter 25 controls the third regulating valve 26 to be opened to maintain the pressure of the storage tank area protection nitrogen pipeline 13 at 0.3MPa, when the pressure of the protection nitrogen pipeline is lower than 0.25MPa, the pressure transmitter 25 controls the fourth regulating valve 27 to be opened, 99.99% (V%) pure nitrogen of 0.6MPa is supplemented to the protection nitrogen pipeline 13 in the storage tank area protection nitrogen pipeline is stabilized, and the fourth regulating valve 27 is closed after the pressure of the storage tank area protection nitrogen pipeline 13 is 0.3 MPa.
The polluted nitrogen components discharged by the storage tank with nitrogen protection in the storage tank areas of petrochemical enterprises are complex, contain high-concentration nitrogen and unavoidable air, and also contain volatile hydrocarbons, benzene series, sulfides, water vapor and the like of storage materials. According to the storage tank nitrogen protection technical standard, the system can be produced to meet the requirements that the purity of the storage tank protection nitrogen is not lower than 99% (V percent) and the pressure of a nitrogen main pipe is not lower than 0.3MPa, so that the safety of the storage tank is ensured, and the quality of stored materials is ensured.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (4)
1. The recycling method for the storage tank zone protection nitrogen is characterized in that the recycling system for the storage tank zone protection nitrogen comprises a compressor, a cooler, a desulfurizing tower, a cold dryer, a dealkylation adsorber, a vacuum pump, a deoxidization adsorber, a silencer, a nitrogen tank and a fine filter; the inlet of the compressor is connected with a dirty nitrogen discharge main pipe of the storage tank area, the outlet of the compressor is connected with an inlet of a cooler, the outlet of the cooler is connected to a dirty nitrogen inlet at the lower part of the desulfurizing tower, the outlet at the upper part of the desulfurizing tower is connected with an inlet of a cold dryer, the outlet of the cold dryer is connected to an inlet main pipe inlet of a dealkylation adsorber, an outlet of an outlet main pipe of the dealkylation adsorber is connected with an inlet main pipe inlet of a deoxygenation adsorber, an outlet of a desorption main pipe of the dealkylation adsorber is connected with an inlet of a vacuum pump, an outlet of a desorption main pipe of the deoxygenation adsorber is connected with an inlet of a silencer, an outlet of the deoxidization adsorber is connected with an inlet of a nitrogen tank, and an outlet of the nitrogen tank is connected with an inlet of a fine filter, and an outlet of the fine filter is connected with a storage tank area protection nitrogen pipeline;
the hydrocarbon removal adsorber comprises at least two hydrocarbon removal adsorption towers which are arranged in parallel, and silica gel and activated carbon hydrocarbon removal adsorbents are filled in the hydrocarbon removal adsorption towers from bottom to top;
the deoxidization absorber comprises at least two deoxidization adsorption towers which are arranged in parallel, deoxidization adsorbent is filled in the deoxidization adsorption towers, and the deoxidization adsorbent is a carbon molecular sieve;
the using method of the storage tank zone protection nitrogen recycling system comprises the following steps:
(1) Pure nitrogen is supplemented into a dirty nitrogen discharge header pipe at the inlet of the compressor, and the oxygen content in the dirty nitrogen is controlled to be lower than 5 percent (V%);
(2) Cooling the polluted nitrogen gas to below 45 ℃ and then desulfurizing;
(3) Cooling the polluted nitrogen to 2-4 ℃ and removing water and C in the polluted nitrogen 6 The above hydrocarbon components;
(4) Pure nitrogen is supplemented into an air inlet main pipe of the hydrocarbon removal adsorber, and the oxygen content in the polluted nitrogen is controlled to be lower than 5 percent (V percent);
(5) The hydrocarbon removal adsorption tower performs adsorption-regeneration automatic switching operation, a vacuum pump vacuumizes the regenerated hydrocarbon removal adsorption tower to desorb organic matters in the hydrocarbon removal adsorbent, and the analysis gas is recycled or incinerated;
(6) The deoxidization adsorption tower performs adsorption-regeneration automatic switching operation, and the gas in the regenerated deoxidization adsorption tower is exhausted to normal pressure;
(7) The pressure of the nitrogen stored in the nitrogen tank is not lower than the use pressure of the nitrogen protected in the storage tank area, the third regulating valve is controlled by the output signal of the pressure transmitter to ensure that the pressure of the nitrogen protected in the storage tank area reaches the use pressure, and when the pressure of the nitrogen protected in the storage tank area cannot reach the use pressure, the pure nitrogen is supplemented to the nitrogen protected in the storage tank area by the fourth regulating valve to reach the use pressure.
2. The recycling method for the nitrogen protection in the storage tank area according to claim 1, wherein a first oxygen content analyzer and a factory pure nitrogen pipeline are sequentially arranged between a pipeline at the inlet of the compressor and a dirty nitrogen discharge main pipe of the storage tank area, a first regulating valve is arranged on the factory pure nitrogen pipeline, and an output signal of the first oxygen content analyzer is connected to the first regulating valve.
3. The recycling method of nitrogen protection in a storage tank area according to claim 2, wherein a second oxygen content analyzer is arranged between the outlet of the cold dryer and the inlet of the inlet manifold of the hydrocarbon removal adsorber, the plant area pure nitrogen pipeline is connected to the inlet manifold of the hydrocarbon removal adsorber, a second regulating valve is arranged on the plant area pure nitrogen pipeline, and the output signal of the second oxygen content analyzer is connected to the second regulating valve.
4. The recycling method for the protected nitrogen in the storage tank area according to claim 2, wherein a third regulating valve and a pressure transmitter are sequentially arranged on an outlet of the fine filter and a protected nitrogen pipeline in the storage tank area, the pure nitrogen pipeline in the factory area is connected to the protected nitrogen pipeline in the storage tank area, a fourth regulating valve is arranged on the pure nitrogen pipeline in the factory area, and output signals of the pressure transmitter are respectively connected to the third regulating valve and the fourth regulating valve.
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| CN110526223A (en) * | 2019-10-12 | 2019-12-03 | 马鞍山钢铁股份有限公司 | A kind of high pure nitrogen purifying technique and device |
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