CN212127523U - Combined treatment system for waste sulfuric acid and acid gas - Google Patents
Combined treatment system for waste sulfuric acid and acid gas Download PDFInfo
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- CN212127523U CN212127523U CN202020266803.2U CN202020266803U CN212127523U CN 212127523 U CN212127523 U CN 212127523U CN 202020266803 U CN202020266803 U CN 202020266803U CN 212127523 U CN212127523 U CN 212127523U
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- 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
Abstract
The utility model discloses a to waste sulfuric acid and acid gas combined treatment system, this processing system has connected gradually pyrolysis furnace, exhaust-heat boiler, air heater, power wave scrubber, packed tower, two-stage electric demister, drying tower, first converter, first absorption tower, second converter, second absorption tower, tail absorption tower, first absorption tower is connected with one-level tower circulating slot, one-level tower circulating slot links to each other with the finished product acid tank. The processing system is advanced and reliable, reliable in performance, convenient to operate and suitable for large-scale use.
Description
Technical Field
The utility model relates to a processing technology field of concentrated sulfuric acid does not especially relate to and unite processing system to waste sulfuric acid and acid gas.
Background
At present, the sulfuric acid generated in the production process of the petrochemical industry generally has the problem of difficult recovery treatment, and particularly, in a sulfuric acid-carbon four comprehensive utilization device of petrochemical enterprises in China, 80-100 kg of sulfuric acid with the concentration of 90% is generated when 1 ton of alkylate oil is produced, and the components of the sulfuric acid also contain about 7% of organic matters and about 3% of water besides sulfuric acid. The sulfuric acid is a colloidal liquid with high viscosity, is black and red in color, unstable in property, smells specially and is difficult to treat.
The acid gas is produced by an acid water desulfurization unit of an upstream device, enters a tail gas recovery device for treatment at present, and is absorbed by sodium alkali to produce sodium hydrosulfide, so that the sodium alkali consumption is high, and the operation cost is high. How to simultaneously treat waste sulfuric acid and acid gas to obtain pure concentrated sulfuric acid is a problem to be solved urgently in the industry at present.
SUMMERY OF THE UTILITY MODEL
Based on the above problem, the utility model aims at providing a to waste sulfuric acid and acid gas combined treatment system.
The utility model discloses a processing system includes in proper order: the system is sequentially connected with a cracking furnace, a waste heat boiler, an air preheater, a dynamic wave washer, a packed tower, a two-stage electric demister, a drying tower, a first converter, a first absorption tower, a second converter, a second absorption tower and a tail absorption tower, wherein the first absorption tower is connected with a first-stage tower circulation tank, and the first-stage tower circulation tank is connected with a finished product acid tank.
Particularly, the packed tower still is connected with the degasser, during the overhead gas among the degasser lets in the packed tower, one side of degasser with the pipe chute settler links to each other, will during the supernatant in the pipe chute settler inserts the degasser, the other end of pipe chute settler is connected with the effluent water sump, one side of effluent water sump is connected with sewage treatment plant.
Particularly, the utility model discloses an among the processing system the drying tower is connected with the drying tower circulating slot, the drying tower circulating slot with the one-level tower circulating slot is connected.
Specifically, the first-stage tower circulation tank is connected with a second-stage tower circulation tank, and the second-stage tower circulation tank is connected with the second absorption tower.
Compared with the prior art, the utility model discloses following beneficial effect has: the selection of the technical scheme of the device is based on the sulfuric acid treatment technology in recent years, the actual operation experience of the sulfuric acid device which is put into operation in recent years in China is combined, improvement and improvement are carried out on the premise of stability and reliability, and the technology and equipment are all based on localization. The treatment system is advanced and stable, reliable in performance and convenient to operate, and fully considers that the raw material is a large amount of sulfuric acid with the concentration of 90 percent, which is completely different from the conventional acid preparation raw material. The technical scheme is as follows: the process comprises the processes of sulfuric acid cracking, closed pickling purification, 3+2 conversion and two absorption, tail gas absorption, waste heat recovery and steam production and the like, and adopts a DCS system for automatic control. The main characteristics are as follows:
(1) the high-temperature combustion cracking technology of the sulfuric acid cracking furnace is adopted, so that the burning rate of sulfur is improved.
(2) Closed acid cleaning is adopted to reduce the output of dilute acid.
(3) Using five stages of conversion of '3 + 2' to make SO2The total conversion rate is more than 99.75 percent, and the SO in the tail gas is ensured by using the tail gas for absorption2On the premise of reaching the standard, the concentration is discharged as low as possible.
(4) Drying furnace gas by using 93% acid, and absorbing SO by using 98% acid3。
(5) Medium temperature absorption is employed to suppress the formation of mist particles and to increase the mist particle size for dehazing.
(6) And arranging a waste heat boiler at the outlet of the sulfuric acid cracking furnace, and recovering the waste heat to produce medium-pressure saturated steam.
Drawings
FIG. 1 shows a combined treatment system for waste sulfuric acid and acid gas according to the present invention.
Description of the sequence numbers: the device comprises a cracking furnace 1, a waste heat boiler 2, an air preheater 3, a dynamic wave washer 4, a packed tower 5, a two-stage electric demister 6, a drying tower 7, a first converter 8, a first absorption tower 9, a second converter 10, a second absorption tower 11, a tail absorption tower 12, a sewage tank 13, a sewage treatment device 14, an inclined tube settler 15, a degassing tower 16, a drying tower circulation tank 17, a first-stage tower circulation tank 18, a finished acid tank 19 and a second-stage tower circulation tank 20.
Detailed Description
The invention will be further described with reference to the following specific embodiments and the accompanying drawings.
The utility model discloses a joint treatment system for waste sulfuric acid and acid gas, as shown in figure 1, is connected with a cracking furnace 1, a waste heat boiler 2, an air preheater 3, a dynamic wave scrubber 4, a packed tower 5, a two-stage electric demister 6, a drying tower 7, a first converter 8, a first absorption tower 9, a second converter 10, a second absorption tower 1 and a tail absorption tower 12 in sequence, the first absorption tower is connected with a first-stage tower circulating groove 18, the first-stage tower circulating groove 18 is connected with a finished product acid tank 19,
the packed tower 5 is further connected with a degassing tower 16, overhead gas in the degassing tower 16 is introduced into the packed tower 5, one side of the degassing tower is connected with an inclined tube settler 15, supernatant in the inclined tube settler 15 is introduced into the degassing tower 16, the other end of the inclined tube settler 15 is connected with a sewage tank 13, and one side of the sewage tank 13 is connected with a sewage treatment device 14.
The drying tower 7 is connected with a drying tower circulating groove 17, and the drying tower circulating groove 17 is connected with a primary tower circulating groove 18. The first-stage tower circulation tank 18 is connected with a second-stage tower circulation tank 20, and the second-stage tower circulation tank 20 is connected with the second absorption tower 11.
The treatment system is used for treating industrial waste sulfuric acid and waste acid gas, the industrial waste sulfuric acid and the waste acid gas are filled into a cracking furnace 1 for cracking treatment, then the temperature is reduced and cooled through a waste heat boiler 2 and an air preheater 3, then the gas is treated through a dynamic wave scrubber 4, a packing tower 5, a two-stage electric demister 6, a drying tower 7, a first converter 8 and a first absorption tower 9, the qualified sulfuric acid treated by the first absorption tower flows into a first-stage tower circulating tank 18, the treated gas flows into a finished acid tank 19, the gas treated by the first absorption tower flows into a second-stage tower circulating tank 20 through a second converter 10 and a second absorption tower 11, the sulfuric acid obtained in the second absorption tower flows into a second-stage tower circulating tank 20, the treated gas flows into the first-stage tower circulating tank 18, the gas passing through the second absorption tower enters a tail absorption tower 12, after being treated, the waste water reaches the standard of discharge,
the flue gas impurities washed by the dynamic wave washer 4 enter the inclined tube settler 15 for sedimentation, most of the dilute acid returns to the dynamic wave washer 4 for continuous use, a small amount of redundant dilute acid enters the degassing tower 16 for blowing off sulfur dioxide gas and then is discharged into the sewage tank 13, an alkali piece is added for neutralization treatment, and then the sewage passes through the sewage device 14, so that the sewage reaches the discharge standard; the sulfur dioxide-containing gas is blown out and enters a packed tower 5 for impurity separation, and the sulfur dioxide is recycled.
In some embodiments, the raw material treated by the power wave scrubber 4 is treated by a tube settler 15, a part of the supernatant is returned to the power wave scrubber 4 and flows into the packed tower 5, the residual waste in the tube settler 15, i.e. dilute acid, flows into the sewage tank 13 and is neutralized by alkali plates for treatment, and another part of the supernatant treated by the tube settler 15 flows into the sewage tank through a degassing tower 16.
In some embodiments, 10% lye is first added to the tail absorption tower 12 for neutralization, and then the dynamic wave treatment is carried out.
In some embodiments, both the primary tower circulation tank 18 and the secondary tower circulation tank 20 are desalinated.
In the process, 93 percent acid is adopted to dry furnace gas, and 98 percent acid absorbs SO3And the sulfuric acid in the primary tower circulation tank 18 and the secondary tower circulation tank 20 is subjected to a desalting water treatment at the same time.
In the process method, a waste heat boiler is arranged at the outlet of a sulfuric acid cracking furnace, and medium-pressure saturated steam is recovered from waste heat.
The principle and the implementation of the present invention are explained herein by using specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (4)
1. The utility model provides a to useless sulphuric acid and acid gas combined treatment system, its characterized in that, the system has connected gradually pyrolysis furnace (1), exhaust-heat boiler (2), air heater (3), dynamic wave scrubber (4), packed tower (5), two-stage electric demister (6), drying tower (7), first converter (8), first absorption tower (9), second converter (10), second absorption tower (11), tail absorption tower (12), first absorption tower (9) are connected with one-level tower circulating slot (18), one-level tower circulating slot (18) link to each other with finished product acid tank (19).
2. The combined treatment system for waste sulfuric acid and acid gas according to claim 1, wherein the packed tower (5) is further connected with a degassing tower (16), overhead gas in the degassing tower (16) is introduced into the packed tower (5), one side of the degassing tower (16) is connected with a pipe chute settler (15), supernatant in the pipe chute settler (15) is introduced into the degassing tower (16), the other end of the pipe chute settler (15) is connected with a sewage tank (13), and one side of the sewage tank (13) is connected with a sewage treatment device (14).
3. The combined treatment system for waste sulfuric acid and acid gas according to claim 1, wherein the drying tower (7) is connected with a drying tower circulation tank (17), and the drying tower circulation tank (17) is connected with the primary tower circulation tank (18).
4. A combined waste sulfuric acid and acid gas treatment system according to claim 1, wherein the primary tower circulation tank (18) is connected to a secondary tower circulation tank (20), and the secondary tower circulation tank (20) is connected to the second absorption tower (11).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020266803.2U CN212127523U (en) | 2020-03-06 | 2020-03-06 | Combined treatment system for waste sulfuric acid and acid gas |
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| CN202020266803.2U CN212127523U (en) | 2020-03-06 | 2020-03-06 | Combined treatment system for waste sulfuric acid and acid gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111204715A (en) * | 2020-03-06 | 2020-05-29 | 河北新启元能源技术开发股份有限公司 | Combined treatment system and method for waste sulfuric acid and acid gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111204715A (en) * | 2020-03-06 | 2020-05-29 | 河北新启元能源技术开发股份有限公司 | Combined treatment system and method for waste sulfuric acid and acid gas |
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