CN114534471A - Treatment method of tail gas generated by regenerating mercaptan-removing alkali liquor - Google Patents
Treatment method of tail gas generated by regenerating mercaptan-removing alkali liquor Download PDFInfo
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- CN114534471A CN114534471A CN202011351304.4A CN202011351304A CN114534471A CN 114534471 A CN114534471 A CN 114534471A CN 202011351304 A CN202011351304 A CN 202011351304A CN 114534471 A CN114534471 A CN 114534471A
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- 239000003513 alkali Substances 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 61
- 230000001172 regenerating effect Effects 0.000 title claims abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 162
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000003546 flue gas Substances 0.000 claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229910001868 water Inorganic materials 0.000 claims abstract description 42
- BWGNESOTFCXPMA-UHFFFAOYSA-N Dihydrogen disulfide Chemical compound SS BWGNESOTFCXPMA-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000002918 waste heat Substances 0.000 claims abstract description 38
- 238000005406 washing Methods 0.000 claims abstract description 34
- 239000007788 liquid Substances 0.000 claims abstract description 24
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 claims abstract description 23
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 22
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000004523 catalytic cracking Methods 0.000 claims abstract description 17
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 16
- 230000023556 desulfurization Effects 0.000 claims abstract description 16
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 12
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 11
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 11
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 claims abstract description 11
- 230000003647 oxidation Effects 0.000 claims abstract description 11
- 238000000926 separation method Methods 0.000 claims abstract description 9
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 4
- 230000008929 regeneration Effects 0.000 claims description 36
- 238000011069 regeneration method Methods 0.000 claims description 36
- 239000006260 foam Substances 0.000 claims description 22
- 239000000945 filler Substances 0.000 claims description 13
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 12
- 239000004033 plastic Substances 0.000 claims description 10
- 229920003023 plastic Polymers 0.000 claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 239000003502 gasoline Substances 0.000 claims description 5
- 239000003350 kerosene Substances 0.000 claims description 5
- 230000014759 maintenance of location Effects 0.000 claims description 5
- 229920000742 Cotton Polymers 0.000 claims description 4
- 229910000792 Monel Inorganic materials 0.000 claims description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000012670 alkaline solution Substances 0.000 claims 2
- 239000003518 caustics Substances 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract 1
- 238000012856 packing Methods 0.000 description 14
- 239000002283 diesel fuel Substances 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 239000002250 absorbent Substances 0.000 description 3
- 230000002745 absorbent Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- CETBSQOFQKLHHZ-UHFFFAOYSA-N Diethyl disulfide Chemical compound CCSSCC CETBSQOFQKLHHZ-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 239000010779 crude oil Substances 0.000 description 2
- 230000003009 desulfurizing effect Effects 0.000 description 2
- WQOXQRCZOLPYPM-UHFFFAOYSA-N dimethyl disulfide Chemical compound CSSC WQOXQRCZOLPYPM-UHFFFAOYSA-N 0.000 description 2
- DNJIEGIFACGWOD-UHFFFAOYSA-N ethanethiol Chemical compound CCS DNJIEGIFACGWOD-UHFFFAOYSA-N 0.000 description 2
- 238000005984 hydrogenation reaction Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- HYHCSLBZRBJJCH-UHFFFAOYSA-M sodium hydrosulfide Chemical compound [Na+].[SH-] HYHCSLBZRBJJCH-UHFFFAOYSA-M 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 229910052798 chalcogen Inorganic materials 0.000 description 1
- 150000001787 chalcogens Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 150000002019 disulfides Chemical class 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- XLTBPTGNNLIKRW-UHFFFAOYSA-N methyldisulfanylethane Chemical compound CCSSC XLTBPTGNNLIKRW-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 125000001741 organic sulfur group Chemical group 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Images
Classifications
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- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Treating Waste Gases (AREA)
- Industrial Gases (AREA)
Abstract
The invention relates to a treatment method of tail gas regenerated by mercaptan removal alkali liquor, wherein the mercaptan removal alkali liquor contains disulfide, and the treatment method comprises the following steps: carrying out gas-liquid separation on the regenerated tail gas to remove the entrained alkali liquor, then washing with water to meet the requirements, combining the regenerated tail gas with the flue gas generated in the catalytic cracking process to form mixed gas, then feeding the mixed gas into a waste heat boiler in the catalytic cracking process, in the waste heat boiler, carrying out high-temperature oxidation decomposition on disulfide in the mixed gas into sulfur dioxide, carbon dioxide and water, and carrying out flue gas desulfurization on the formed gas flow. The method realizes the harmless treatment of the tail gas generated by regenerating the mercaptan-removed alkali liquor, and effectively reduces the emission of three wastes from the factory from the source.
Description
Technical Field
The invention belongs to the field of oil refining chemical industry, and relates to a treatment method of tail gas generated by regenerating mercaptan-removing alkali liquor containing disulfide.
Background
Because crude oil contains sulfides to different degrees, sulfur with different light and heavy forms can enter corresponding products according to boiling point difference in the crude oil refining process, and according to the distillation range characteristics of fractions such as liquefied gas, gasoline, kerosene, diesel oil and the like, the sulfur forms such as hydrogen sulfide, methyl mercaptan, ethyl mercaptan and the like can be removed through alkaline washing under the conditions of certain temperature, pressure and full contact, wherein mercaptan reacts with a sodium hydroxide solution to generate sodium mercaptide, and the sodium mercaptide is changed into inorganic sulfur which enters alkali liquor, so that the aim of removing mercaptan is fulfilled. The alkali liquor containing sodium alcoholate can be oxidized and regenerated under the condition of oxygen and catalyst and at a certain temp. and pressure, and the inorganic sulfur in the regenerated alkali liquor can be converted into organic sulfur, mainly using dimethyl disulfide, diethyl disulfide and methyl ethyl disulfide (generally called disulfide). The organic chalcogen oil phase has higher relative volatility and enters tail gas while regenerating alkali liquor. The sulfur-containing tail gas is not in accordance with the emission standard whether being directly emitted or being emitted after being burned, and causes serious environmental pollution.
Patent CN101940872B discloses a method for desulfurizing tail gas by alkali liquor oxidation regeneration of water washing-membrane separation-oxidation, which has long process flow and causes increased desulfurization cost no matter the membrane separation component or the adsorbent is consumed. Patent CN201210174207.1 discloses a containerDevice and method for desulphurizing waste gases of disulphides, which method makes it possible to reduce the disulphides to 200mg/Nm3It is difficult to meet the requirements of future emission standards. Patent CN201110433220.X proposes an oxidation sweetening tail gas treatment and utilization method, and the advanced desulfurizing tower absorbent absorption of pending tail gas goes to the adsorption tank and takes off organic hydrocarbon after the desulfurization, because the adsorbent is regularly changed, consequently the absorption effect is unstable, and the absorbent after the replacement also can bring new processing problem simultaneously. Patent CN104624019A invented a processing method that contains alkaline liquid oxidation regeneration tail gas of mercaptan, adopted diesel oil as the disulfide in absorbent absorption tail gas, rich absorption oil goes hydrogenation unit to carry out desulfurization treatment afterwards, and this method flow is complicated to increased hydrogenation unit's processing load, hydrogen consumption is high, and the tail gas still can carry part saturated gaseous hydrocarbon after diesel oil separation recovery, and the subsequent processing degree of difficulty is big.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for treating tail gas generated by regenerating a sweetening alkali liquor containing disulfide. The treatment method utilizes the disulfide to realize high-temperature oxidative decomposition into sulfur dioxide, carbon dioxide and water under the conditions of certain temperature, pressure, oxygen concentration and retention time, and finally the mixed gas of the tail gas and the flue gas enters a flue gas desulfurization device, so that the purified gas is discharged after reaching the standard.
Therefore, the invention provides a treatment method of tail gas regenerated by sweetening alkali liquor, wherein the sweetening alkali liquor contains disulfide, and the treatment method comprises the following steps:
carrying out gas-liquid separation on the regenerated tail gas to remove entrained alkali liquor, then washing with water to meet the requirement, combining with flue gas generated in the catalytic cracking process to form mixed gas, then feeding the mixed gas into a waste heat boiler of the catalytic cracking process, carrying out high-temperature oxidation decomposition on disulfide in the mixed gas into sulfur dioxide, carbon dioxide and water in the waste heat boiler, and carrying out flue gas desulfurization on the formed gas stream;
wherein the requirements are: the volume ratio of the regeneration tail gas to the flue gas is not more than 0.2, and the content of oxygen in the mixed gas is not less than 1 v%;
the inlet flue gas temperature of the waste heat boiler is 350-550 ℃, the mixed gas is heated to be above 250 ℃, and the retention time in the waste heat boiler is 1-10 sec;
the operating pressure in the waste heat boiler is 0-10 kPa.
The method for treating the tail gas regenerated by the mercaptan removal alkali liquor, disclosed by the invention, has the advantages that the regenerated tail gas is preferably from an alkali liquor regeneration device for alkali washing of liquefied gas, gasoline, kerosene and diesel oil, and the content range of disulfide is not more than 200000mg/Nm3。
In the method for treating tail gas generated by regenerating the mercaptan removal alkali liquor, the gas-liquid separation is preferably carried out in a gas-liquid separator.
According to the treatment method of the tail gas generated by regenerating the mercaptan removal alkali liquor, a foam breaking net is preferably arranged in the gas-liquid separator.
The treatment method of the tail gas generated by regenerating the mercaptan removal alkali liquor, disclosed by the invention, is preferably characterized in that the specification of the foam breaking net is selected from one of SP, DP, HR and HP, and the thickness of the foam breaking net is 50-300 mm.
The treatment method of the tail gas regenerated by the demercaptan alkali liquor, disclosed by the invention, is characterized in that the material for preparing the foam breaking net is selected from one or more of AISI201(AISI is American iron and steel Association standard, and is listed as two major American industry standards with ASTM (American society for Industrial science), AISI201, AISI202, AISI301, AISI302, AISI304L, AISI321 1, AISI316L, pure nickel wire, pure titanium wire, Monel, galvanized wire, drawn wire, stainless steel wire, cotton wire and plastics, wherein the plastics comprise one or more of PP, PC, PE, PVC and PTFE.
In the method for treating tail gas generated by regenerating mercaptan removal alkali liquor, the water washing is preferably carried out in a water washing tower.
The treatment method of the tail gas regenerated by the mercaptan removal alkali liquor, disclosed by the invention, is characterized in that the water washing tower is a sieve plate water washing tower or a filler water washing tower.
The treatment method of the tail gas regenerated by the mercaptan removal alkali liquor, disclosed by the invention, has the advantages that the filler of the filler washing tower is preferably regular filler or bulk filler, and the filler is prepared from one or more of ceramics, metal or plastics.
The invention relates to a treatment method of tail gas generated by regenerating a mercaptan removal alkali liquor containing disulfide, which is implemented by using a gas-liquid separator, a water washing tower, a waste heat boiler and a flue gas desulfurization device, and specifically comprises the following steps: the method comprises the steps of firstly feeding tail gas generated by regenerating the mercaptan-removing alkali liquor containing disulfide to be treated into a gas-liquid separator, feeding the tail gas without the alkali liquor into the bottom of a water washing tower, washing the tail gas with water, leaving the tail gas from the top of the tower, combining the tail gas with catalytic cracking flue gas to form mixed gas, feeding the mixed gas into a waste heat boiler in a catalytic cracking process, decomposing the disulfide in the mixed gas into sulfur dioxide, carbon dioxide and water through high-temperature oxidation in the waste heat boiler, feeding the formed gas stream into a flue gas desulfurization device, and discharging the purified gas up to the standard.
In the implementation process, the requirement that the tail gas is converged into the flue gas is as follows: the volume ratio of the tail gas to the flue gas in the mixed gas after the tail gas and the flue gas are mixed is not more than 0.2, the content of oxygen in the mixed gas after the tail gas and the flue gas are mixed is not less than 1% mol, the inlet flue gas temperature of a waste heat boiler is 350-550 ℃, and the residence time of the mixed gas after the mixed gas is heated to more than 250 ℃ is 1-10 sec; the operating pressure in the waste heat boiler is 0-10 kPa (G).
In the implementation process, the tail gas generated in the regeneration of the mercaptan removal alkali liquor containing disulfide is from an alkali liquor regeneration device for alkali washing of liquefied gas, gasoline, kerosene and diesel oil, and the content range of the disulfide is not more than 200000mg/Nm3(ii) a The gas-liquid separator is internally provided with a foam breaking net, the specification of the foam breaking net can adopt the forms of SP, DP, HR, HP and the like, the thickness of the foam breaking net is 50-300 mm, and the foam breaking net is made of AISI201, AISI202, AISI301, AISI302, AISI304L, AISI321 1, AISI316L, pure nickel wire, pure titanium wire, Monel, galvanized wire, drawn wire, stainless steel wire and cotton wire or one or more of plastic, PP, PC, PE, PVC and PTFE; the washing tower is a sieve plate tower or a packed tower, when the packed tower is selected, the internal packing is regular packing or bulk packing, and the packing material is one or more of ceramics, metal or plastics.
The invention has the following effects: aiming at the tail gas regenerated by the desulfurized alcohol alkali liquor containing disulfide, the disulfide can be oxidized and decomposed into sulfur dioxide, carbon dioxide and water at high temperature under certain conditions, finally the mixed gas of the tail gas and the flue gas is sent to a flue gas desulfurization device, and the purified gas reaches the standard and is discharged.
Drawings
FIG. 1 is a process flow diagram of the process for treating the tail gas from regeneration of a mercaptan-removing lye containing disulfides according to the present invention;
drawings
1-regenerating the tail gas, namely,
2-a gas-liquid separator, wherein,
3-removing the regenerated tail gas after the alkali liquor,
4-a water-washing tower, wherein,
5-washing the tail gas with water,
6-the catalytic cracking flue gas is introduced,
7-a waste heat boiler, wherein the waste heat boiler is connected with a waste heat boiler,
8-the smoke at the outlet of the waste heat boiler,
9-a flue gas desulfurization device, wherein,
10-purifying the flue gas after the purification,
11-a foam-breaking net, wherein,
12-a filler.
Detailed Description
The following examples illustrate the invention in detail: the present example is carried out on the premise of the technical scheme of the present invention, and detailed embodiments and processes are given, but the scope of the present invention is not limited to the following examples, and the experimental methods without specific conditions noted in the following examples are generally performed according to conventional conditions.
The invention provides a treatment method of tail gas regenerated by mercaptan removal alkali liquor, wherein the mercaptan removal alkali liquor contains disulfide, and the treatment method comprises the following steps:
carrying out gas-liquid separation on the regenerated tail gas to remove entrained alkali liquor, then washing with water to meet the requirement, combining with flue gas generated in the catalytic cracking process to form mixed gas, then feeding the mixed gas into a waste heat boiler of the catalytic cracking process, carrying out high-temperature oxidation decomposition on disulfide in the mixed gas into sulfur dioxide, carbon dioxide and water in the waste heat boiler, and carrying out flue gas desulfurization on the formed gas stream;
wherein the requirements are: the volume ratio of the regeneration tail gas to the flue gas is not more than 0.2, and the content of oxygen in the mixed gas is not less than 1 v%;
the inlet flue gas temperature of the waste heat boiler is 350-550 ℃, the mixed gas is heated to be above 250 ℃, and the retention time in the waste heat boiler is 1-10 sec;
the operating pressure in the waste heat boiler is 0-10 kPa.
In some embodiments, it is preferable that the regeneration tail gas comes from an alkali liquor regeneration device for liquefied gas, gasoline, kerosene and diesel alkaline washing, wherein the content range of disulfide is no more than 200000mg/Nm3。
In some embodiments, it is preferred that the gas-liquid separation is performed in a gas-liquid separator.
In some embodiments, it is preferred that a foam breaking net is provided in the gas-liquid separator.
In some embodiments, it is preferable that the size of the foam breaking net is selected from one of SP, DP, HR, HP, and the thickness of the foam breaking net is 50 to 300 mm.
In some embodiments, it is preferred that the material for making the foam breaking net is selected from one or more of AISI201, AISI202, AISI301, AISI302, AISI304L, AISI321 1, AISI316L, pure nickel wire, pure titanium wire, monel, galvanized wire, drawn wire, stainless steel wire, cotton wire, plastic, including one or more of PP, PC, PE, PVC, PTFE.
In some embodiments, it is preferred that the water wash is performed in a water wash column.
In some embodiments, it is preferred that the water wash column is a sieve tray water wash column or a packed water wash column.
In some embodiments, it is preferable that the packing of the packed water washing column is structured packing or bulk packing, and the packing is made of one or more of ceramics, metals or plastics.
Example 1
Referring to fig. 1, a liquefied gas sweetening alcohol alkali liquor regeneration tail gas 1 containing disulfide to be treated firstly enters a gas-liquid separator 2 to remove alkali liquor carried in the regeneration tail gas 1, a regeneration tail gas 3 from which the alkali liquor is removed enters the bottom of a water washing tower 4, and is washed to obtain a washed tail gas 5 leaving from the top of the tower, a mixed gas formed by combining the washed tail gas 5 and catalytic cracking flue gas 6 enters a waste heat boiler 7 in a catalytic cracking process, the disulfide in the mixed gas is decomposed into sulfur dioxide, carbon dioxide and water through high-temperature oxidation, finally, the flue gas 8 at the outlet of the waste heat boiler enters a flue gas desulfurization device 9, and the purified flue gas 10 achieves standard emission.
Wherein, the gas-liquid separator 2 is provided with an SP specification foam breaking net which is made of AISI 316L; regular packing is arranged in the water washing tower (4), and the material of the packing is AISI 316L. The thickness of the foam breaking net is 80 mm.
The method of the invention is applied to treat the regeneration tail gas of the liquefied gas desulfurized alcohol alkali liquor containing disulfide. The main parameters are as follows: concentration of disulfide in regeneration tail gas is not more than 3500mg/Nm3The volume ratio of the regenerated tail gas to the flue gas is 0.014, the oxygen content of the mixed gas after the regenerated tail gas and the flue gas are mixed is 5 mol%, the inlet flue gas temperature of the waste heat boiler is 495 ℃, and the mixed gas after the regenerated tail gas and the flue gas are mixed is heated to more than 250 ℃ and then stays for 5.5 sec; the operating pressure in the waste heat boiler is 3kPa (G).
In order to avoid serious environmental pollution caused by directly discharging the regenerated tail gas of the mercaptan removal alkali liquor containing disulfide into the atmosphere, the harmless treatment of the tail gas is realized by applying the method.
Example 2
Referring to fig. 1, a liquefied gas sweetening alcohol alkali liquor regeneration tail gas 1 containing disulfide to be treated firstly enters a gas-liquid separator 2 to remove alkali liquor carried in the regeneration tail gas 1, a regeneration tail gas 3 from which the alkali liquor is removed enters the bottom of a water washing tower 4, and is washed to obtain a washed tail gas 5 leaving from the top of the tower, a mixed gas formed by combining the washed tail gas 5 and catalytic cracking flue gas 6 enters a waste heat boiler 7 in a catalytic cracking process, the disulfide in the mixed gas is decomposed into sulfur dioxide, carbon dioxide and water through high-temperature oxidation, finally, the flue gas 8 at the outlet of the waste heat boiler enters a flue gas desulfurization device 9, and the purified flue gas 10 achieves standard emission.
Wherein, the gas-liquid separator 2 is provided with an SP specification foam breaking net which is made of AISI 316L; regular packing is arranged in the water washing tower (4), and the material of the packing is AISI 316L. The thickness of the foam breaking net is 120 mm.
The method of the invention is applied to treat the regeneration tail gas of the liquefied gas desulfurized alcohol alkali liquor containing disulfide. The main parameters are as follows: the concentration of disulfide in the regeneration tail gas is not more than 8000mg/Nm3The volume ratio of the regeneration tail gas to the flue gas is 0.05, the content of oxygen in the mixed gas after the regeneration tail gas and the flue gas are mixed is 3.5 mol%, the inlet flue gas temperature of the waste heat boiler is 505 ℃, the mixed gas after the regeneration tail gas and the flue gas are mixed is heated to more than 250 ℃, and the retention time is 3.5 sec; the operating pressure in the waste heat boiler was 1.5kPa (G).
In order to avoid the problem that the tail gas generated by regenerating the disulfide-containing sweetening alkali liquor is directly discharged into the atmosphere after being absorbed by diesel oil, the tail gas carries hydrocarbon to pollute the environment and has larger potential safety hazard, the harmless treatment of the tail gas is realized after the method is applied.
Example 3
Referring to fig. 1, a liquefied gas sweetening alcohol alkali liquor regeneration tail gas 1 containing disulfide to be treated firstly enters a gas-liquid separator 2 to remove alkali liquor carried in the regeneration tail gas 1, a regeneration tail gas 3 from which the alkali liquor is removed enters the bottom of a water washing tower 4, and is washed to obtain a washed tail gas 5 leaving from the top of the tower, a mixed gas formed by combining the washed tail gas 5 and catalytic cracking flue gas 6 enters a waste heat boiler 7 in a catalytic cracking process, the disulfide in the mixed gas is decomposed into sulfur dioxide, carbon dioxide and water through high-temperature oxidation, finally, the flue gas 8 at the outlet of the waste heat boiler enters a flue gas desulfurization device 9, and the purified flue gas 10 achieves standard emission.
Wherein, the gas-liquid separator 2 is provided with an SP specification foam breaking net which is made of AISI 316L; regular packing is arranged in the water washing tower (4), and the material of the packing is AISI 316L. The thickness of the foam breaking net is 100 mm.
The method of the invention is applied to treat the regeneration tail gas of the liquefied gas desulfurized alcohol alkali liquor containing disulfide. The main parameters are as follows: the concentration of disulfide in the regeneration tail gas is not more than 5000mg/Nm3The volume ratio of the regenerated tail gas to the flue gas is 0.025, the oxygen content in the mixed gas after the regenerated tail gas and the flue gas are mixed is 4 mol%, the temperature of the flue gas at the inlet of the waste heat boiler is 485 ℃, and the residence time of the mixed gas after the regenerated tail gas and the flue gas are mixed is 7sec after the mixed gas is heated to more than 250 ℃; the operating pressure in the waste heat boiler was 0.5kPa (G).
In order to avoid serious environmental pollution caused by directly discharging the regenerated tail gas of the mercaptan removal alkali liquor containing disulfide into the atmosphere, the harmless treatment of the tail gas is realized by applying the method.
In summary, the present invention has the following effects: aiming at the tail gas regenerated by the desulfurized alcohol alkali liquor containing disulfide, the disulfide can be oxidized and decomposed into sulfur dioxide, carbon dioxide and water at high temperature under certain conditions, finally the mixed gas of the tail gas and the flue gas is sent to a flue gas desulfurization device, and the purified gas reaches the standard and is discharged.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it is therefore intended that all such changes and modifications as fall within the true spirit and scope of the invention be considered as within the following claims.
Claims (9)
1. A treatment method for tail gas generated by regenerating sweetening alkali liquor, which contains disulfide, is characterized by comprising the following steps:
carrying out gas-liquid separation on the regenerated tail gas to remove entrained alkali liquor, then washing with water to meet the requirement, combining with flue gas generated in the catalytic cracking process to form mixed gas, then feeding the mixed gas into a waste heat boiler of the catalytic cracking process, carrying out high-temperature oxidation decomposition on disulfide in the mixed gas into sulfur dioxide, carbon dioxide and water in the waste heat boiler, and carrying out flue gas desulfurization on the formed gas stream;
wherein the volume ratio of the regeneration tail gas to the flue gas in the mixed gas is not more than 0.2, and the content of oxygen in the mixed gas is not less than 1 v%;
the inlet flue gas temperature of the waste heat boiler is 350-550 ℃, the mixed gas is heated to be above 250 ℃, and the retention time in the waste heat boiler is 1-10 sec;
the operating pressure in the waste heat boiler is 0-10 kPa.
2. The method for treating tail gas generated in the regeneration of mercaptan-removed alkaline solution according to claim 1, wherein the regenerated tail gas is obtained from an alkaline solution regeneration device for liquefied gas, gasoline, kerosene and diesel caustic washing, and the content range of disulfide is no more than 200000mg/Nm3。
3. The method for treating tail gas generated in the regeneration of mercaptan removal alkali liquor according to claim 1, wherein the gas-liquid separation is carried out in a gas-liquid separator.
4. The method for treating tail gas generated in regeneration of desulfurized alcohol alkali liquor according to claim 3, wherein a foam breaking net is arranged in the gas-liquid separator.
5. The method for treating the tail gas generated in the regeneration of the desulfurized alcohol lye according to claim 4, wherein the specification of the foam breaking net is selected from one of SP, DP, HR and HP, and the thickness of the foam breaking net is 50-300 mm.
6. The method for treating tail gas generated by regenerating desulfurized alcohol lye according to claim 4, characterized in that the material for preparing said foam breaking nets is selected from one or more of AISI201, AISI202, AISI301, AISI302, AISI304L, AISI321, AISI316L, pure nickel wire, pure titanium wire, Monel, galvanized wire, drawn wire, stainless steel wire, cotton thread and plastics, wherein said plastics comprise one or more of PP, PC, PE, PVC and PTFE.
7. The method for treating tail gas generated by regenerating mercaptan removal alkali liquor according to claim 1, wherein the water washing is carried out in a water washing tower.
8. The method for treating tail gas generated in the regeneration of mercaptan removal alkali liquor according to claim 7, wherein the water washing tower is a sieve plate water washing tower or a filler water washing tower.
9. The method for treating tail gas generated in regeneration of desulfurized alcohol alkali liquor according to claim 8, wherein the filler of the filler washing tower is structured filler or bulk filler, and the filler is prepared from one or more of ceramic, metal or plastic.
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