CN216604686U - Tail gas treatment system for preparing sulfuric acid from coking desulfurization waste salt - Google Patents
Tail gas treatment system for preparing sulfuric acid from coking desulfurization waste salt Download PDFInfo
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- CN216604686U CN216604686U CN202122914361.5U CN202122914361U CN216604686U CN 216604686 U CN216604686 U CN 216604686U CN 202122914361 U CN202122914361 U CN 202122914361U CN 216604686 U CN216604686 U CN 216604686U
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Abstract
The utility model belongs to the technical field of tail gas treatment, and particularly provides a tail gas treatment system for preparing sulfuric acid from coking and desulfurization waste salt, which comprises the following steps: acid making unit, heat exchanger, preheater, exhaust-heat boiler and concentrating tower. The cold and heat sources of the system are integrated, and the high-temperature sulfur-containing flue gas at the outlet of the converter gas and the waste heat boiler is used for replacing steam as a heat source to heat the acid making tail gas for two times, so that the energy utilization efficiency of the system is improved, the heat utilization efficiency is improved, the consumption of steam/electricity and circulating cooling water is reduced, and the operation cost is reduced; in addition, the wastewater generated by the acid making process circularly absorbs the acid making tail gas, SO that the cost of wastewater treatment is reduced, secondary pollution is avoided, part of the wastewater is evaporated by the high-temperature acid making tail gas to form water vapor, the water vapor enters the active coke adsorption tower through the exhaust pipe of the concentration tower, and the SO content of the active coke adsorption tower can be improved2The adsorption capacity and the desulfurization efficiency are improved, and the ultralow emission is ensured.
Description
Technical Field
The utility model belongs to the technical field of tail gas treatment, and particularly relates to a tail gas treatment system for preparing sulfuric acid from coking and desulfurization waste salt.
Background
At present, the mainstream coal gas desulfurization process of a chemical production workshop of a coke-oven plant is HPF desulfurization, the byproduct solid waste salt or salt-containing wastewater of a desulfurization working section is difficult to be recycled, and long-term stacking not only wastes floor area, but also causes secondary pollution. The preparation of sulfuric acid by burning waste salt is a new treatment idea and has an engineering example. The system for preparing the sulfuric acid by incineration mostly directly adopts steam for heating, and because the consideration on the grade of a heat source is neglected in the heat recovery process, part of heat sources with lower grade are taken as waste heat to be cooled, so that the double waste of heat and circulating cooling water is caused. In addition, a large amount of wastewater is generated in the acid making process, and the cost of water treatment is increased. In order to overcome the problems, the utility model provides a heat integration optimized tail gas post-treatment system for preparing sulfuric acid by burning coking desulfurization waste salt, which optimizes process heat, improves the heat utilization efficiency and reduces the consumption of steam/electricity and circulating cooling water.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problem of waste of heat and circulating cooling water in the prior art.
Therefore, the utility model provides a tail gas treatment system for preparing sulfuric acid from coking desulfurization waste salt, which is characterized by comprising the following steps: the system comprises an acid making unit, a heat exchanger, a preheater, a waste heat boiler and a concentration tower;
a low-temperature channel I and a high-temperature channel I for heat exchange are arranged in the heat exchanger; the inlet of the low-temperature channel I is communicated with the acid making tail gas outlet of the acid making unit, and the outlet of the low-temperature channel I is communicated with the preheater; an inlet of the high-temperature channel I is communicated with a converter gas outlet of the acid making unit, an outlet of the high-temperature channel I is communicated with a converter gas inlet of the acid making unit, and the acid making tail gas is heated by using the converter gas in the heat exchanger for the first time;
a low-temperature channel II and a high-temperature channel II for heat exchange are arranged in the preheater; the inlet of the low-temperature channel II is communicated with the outlet of the low-temperature channel I, and the outlet of the low-temperature channel II is communicated with the gas inlet of the concentration tower; an inlet of the high-temperature channel II is communicated with an air outlet of the waste heat boiler, an outlet of the high-temperature channel II is communicated with an inlet of the acid making unit, and sulfur-containing flue gas discharged from the waste heat boiler is used for carrying out secondary heating on acid making tail gas in the preheater; all the structures in the tail gas treatment system are communicated through pipelines.
Specifically, the top of the concentration tower is provided with an air inlet pipe communicated with the outlet of the low-temperature channel II; the concentration tower is internally provided with a spraying mechanism, the spraying mechanism comprises a water supply pipe and a spray head, the spray head is positioned below the air inlet pipe and sprays acid making tail gas entering the concentration tower.
Specifically, the water supply pipe of the spraying mechanism and the bottom of the concentration towerA circulating pipe is arranged between the two, a circulating pump is arranged on the circulating pipe, and the liquid at the bottom of the concentration tower is extracted to circularly absorb SO in the acid making tail gas2。
Specifically, the waste liquid outlet of the acid making unit is communicated with the water feeding pipe inlet of the spraying mechanism, and waste water is used for spraying and heat exchanging on acid making tail gas.
Specifically, the tail gas treatment system for preparing sulfuric acid from coking and desulfurization waste salt further comprises a gas purification device; the concentration tower is provided with an exhaust pipe, and the outlet of the exhaust pipe is communicated with the gas purification device.
Specifically, the gas purification apparatus is an activated coke adsorption tower.
Specifically, the tail gas treatment system for preparing sulfuric acid from coking and desulfurization waste salt further comprises a neutralization pond; the neutralization tank is communicated with the bottom of the concentration tower through a drain pipe.
Compared with the prior art, the utility model has the following advantages and beneficial effects:
(1) according to the tail gas treatment system for preparing sulfuric acid from coking desulfurization waste salt, the heat exchanger and the preheater are arranged, the cold source and the heat source of the system are integrated, one-time heating is carried out on the acid making tail gas by using the converter gas of the conversion process of the acid making section to replace steam as the heat source, and then the sulfur-containing flue gas at the outlet of the waste heat boiler is used for carrying out secondary heating on the acid making tail gas, so that the energy utilization efficiency of the system is improved, the heat utilization efficiency is improved, the consumption of steam/electricity and circulating cooling water is reduced, the operation cost is reduced, and the coupling of the system is also enhanced; in addition, the acid making tail gas is heated twice, the high-temperature sulfur-containing flue gas generated by the incinerator is cooled twice in the whole process flow, and the flue gas after being cooled twice is converted and absorbed by the acid making unit, so that the finished sulfuric acid with the mass fraction of more than or equal to 98% can be obtained.
(2) The tail gas treatment system for preparing sulfuric acid from coking desulfurization waste salt takes acid-making tail gas as a heat transfer medium to enrich heat in sulfur-containing flue gas at the outlet of a converter gas and a waste heat boiler, and is used for evaporating waste water generated in the acid-making purification process, and simultaneously, the waste water generated in the purification process is recycledThe tail gas generated in acid making is absorbed circularly, so that the load of a wastewater treatment section is reduced, the operation cost is reduced, and secondary pollution is avoided; part of the wastewater can be evaporated by the high-temperature acid-making tail gas to form water vapor, and the water vapor enters the active coke adsorption tower through the exhaust pipe of the concentration tower, SO that the active coke in the active coke adsorption tower can be improved to SO2The adsorption capacity and the desulfurization efficiency are improved, and the ultralow emission is ensured.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of a tail gas treatment system for preparing sulfuric acid from coking desulfurization waste salt.
Reference numerals: 1. an acid making unit; 2. a converter gas outlet; 3. a system-in port; 4. an acid making tail gas outlet; 5. a heat exchanger; 6. a low-temperature channel I; 7. a high-temperature channel I; 8. a preheater; 9. a low-temperature channel II; 10. a high-temperature channel II; 11. a waste heat boiler; 12. an incinerator; 13. a concentration tower; 14. a circulation pump; 15. a gas purification device; 16. a neutralization pond; 17. and (6) a waste liquid outlet.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The utility model provides a tail gas treatment system for preparing sulfuric acid from coking desulfurization waste salt, which comprises the following steps: the system comprises an acid making unit 1, a heat exchanger 5, a preheater 8, a waste heat boiler 11 and a concentration tower 13;
a low-temperature channel I6 and a high-temperature channel I7 for heat exchange are arranged in the heat exchanger 5; the inlet of the low-temperature channel I6 is communicated with the acid making tail gas outlet 4 of the acid making unit 1, and the outlet is communicated with the preheater 8; an inlet of the high-temperature channel I7 is communicated with a converter gas outlet 2 of the acid making unit 1, an outlet of the high-temperature channel I is communicated with a converter gas inlet 3 of the acid making unit 1, and the acid making tail gas is heated for the first time by using a converter gas in the heat exchanger 5;
a low-temperature channel II 9 and a high-temperature channel II 10 for heat exchange are arranged in the preheater 8; the inlet of the low-temperature channel II 9 is communicated with the outlet of the low-temperature channel I6, and the outlet of the low-temperature channel II is communicated with the gas inlet of the concentration tower 13; the inlet of the high-temperature channel II 10 is communicated with the gas outlet of the waste heat boiler 11, the outlet of the high-temperature channel II is communicated with the inlet of the acid making unit 1, and sulfur-containing flue gas discharged from the waste heat boiler 11 is used for carrying out secondary heating on acid making tail gas in the preheater 8.
When the device is used, the inlet of the waste heat boiler 11 is connected with the external incinerator 12, so that high-temperature sulfur-containing flue gas generated by combustion in the incinerator 12 can sequentially pass through the waste heat boiler 11 and the high-temperature channel II 10 of the preheater 8 and enter the acid making unit 1 to perform an acid making process. High-temperature converter gas generated in the acid making process enters a high-temperature channel I7 of a heat exchanger 5 through a converter gas outlet 2, low-temperature acid making tail gas generated at the end of the acid making process enters a low-temperature channel I6 of the heat exchanger 5 through an acid making tail gas outlet 4, and heat exchange between the converter gas and the acid making tail gas is realized in the heat exchanger 5. The cooled converter gas returns to a conversion system of the acid making unit 1 through a conversion system inlet 3 to complete the subsequent acid making process, the acid making tail gas subjected to primary heating enters a low-temperature channel II 9 of the preheater 8, and at the moment, the high-temperature channel II 10 of the preheater 8 is filled with high-temperature sulfur-containing flue gas discharged from the waste heat boiler 11, so that heat exchange between the sulfur-containing flue gas and the acid making tail gas can be realized in the preheater 8. The cooled sulfur-containing flue gas enters an acid making unit 1, sulfuric acid is prepared through an acid making process, and acid making tail gas after secondary heating enters a concentration tower 13 to finish tail gas purification. According to the tail gas treatment system for preparing sulfuric acid from coking desulfurization waste salt, the heat exchanger 5 and the preheater 8 are arranged, the cold source and the heat source of the system are integrated, one-time heating is carried out on the acid making tail gas by using the one-converter gas of the conversion process of the acid making working section to replace steam as the heat source, and then the sulfur-containing flue gas at the outlet of the waste heat boiler 11 is used for carrying out secondary heating on the acid making tail gas, so that the energy utilization efficiency of the system is improved, the heat utilization efficiency is improved, the consumption of steam/electricity and circulating cooling water is reduced, and the operation cost is reduced. In addition, the acid making tail gas is heated twice, the high-temperature sulfur-containing flue gas generated by the incinerator 12 is cooled twice in the whole process flow, and the flue gas after being cooled twice is converted and absorbed by the acid making unit 1, so that the finished sulfuric acid with the mass fraction of more than or equal to 98% can be obtained.
Specifically, the top of the concentration tower 13 is provided with an air inlet pipe communicated with the outlet of the low-temperature channel II 9; the concentration tower 13 is internally provided with a spraying mechanism which comprises a water supply pipe and a spray head, wherein the spray head is positioned below the air inlet pipe and is used for spraying acid making tail gas entering the concentration tower 13 and absorbing SO in the tail gas2. The liquid-gas ratio of the liquid sprayed by the spray head to the acid making tail gas entering the concentration tower 13 is preferably (15-25): 1.
Further, a circulating pipeline is arranged between the inlet of a water supply pipe of the spraying mechanism and the bottom of the concentration tower 13, and a circulating pump 14 is installed on the circulating pipeline and used for extracting acid liquor at the bottom of the concentration tower 13 to circularly absorb SO in the acid making tail gas2And the concentration of the acid liquid in the concentration tower 13 is improved.
In order to reduce the load of the wastewater treatment section, reduce the operation cost and avoid secondary pollution, a waste liquid outlet 17 of the acid making unit 1 is communicated with a water supply pipe of a spraying mechanism, and the wastewater generated in the acid making process is used as evaporation water supplement of a concentration tower 13 to spray acid making tail gas and absorb the acid making tail gas.
Due to the fact thatBefore entering the concentration tower 13, the acid making tail gas is taken as a heat transfer medium to enrich heat in the converter gas and sulfur-containing flue gas at the outlet of the waste heat boiler 11, and partial waste water is evaporated to form water vapor while being sprayed and cooled by the waste water, so that the tail gas treatment system provided by the utility model also comprises a gas purification device 15; the concentration tower 13 is provided with an exhaust pipe, and the gas purification device 15 is communicated with the outlet of the exhaust pipe to treat the evaporated water vapor and the exhaust gas of the concentration tower 13. Preferably, the gas purification device 15 is an active coke adsorption tower, and the water vapor entering the active coke adsorption tower through the exhaust pipe of the concentration tower 13 can improve the SO content of the active coke in the active coke adsorption tower2The adsorption capacity and the desulfurization efficiency are improved, and the ultralow emission is ensured.
The tail gas treatment system provided by the utility model also comprises a neutralization tank 16, the bottom of the concentration tower 13 is provided with a drain pipe, and SO is absorbed through the drain pipe2The acid liquor formed is sent to a neutralization tank 16, and a series of measures such as alkali addition and sedimentation are adopted for harmless treatment.
The effect of the tail gas treatment system for preparing sulfuric acid from coking desulfurization waste salt according to the present invention is studied by the following specific examples.
Example 1:
as shown in fig. 1, this embodiment provides a tail gas treatment system for preparing sulfuric acid by coking desulfurization waste salt, including: the system comprises an acid making unit 1, a heat exchanger 5, a preheater 8, a waste heat boiler 11, an incinerator 12, a concentration tower 13, an active coke adsorption tower and a neutralization pond 16;
a low-temperature channel I6 and a high-temperature channel I7 are arranged in the heat exchanger 5; the inlet of the low-temperature channel I6 is communicated with the acid making tail gas outlet 4 of the acid making unit 1, and the outlet is communicated with the preheater 8; the inlet of the high-temperature channel I7 is communicated with a converter gas outlet 2 of the acid making unit 1, and the outlet is communicated with a converter system inlet 3 of the acid making unit 1;
a low-temperature channel II 9 and a high-temperature channel II 10 are arranged in the preheater 8; the inlet of the low-temperature channel II 9 is communicated with the outlet of the low-temperature channel I6, and the outlet is communicated with the inlet of the air inlet pipe at the top of the concentration tower 13; the inlet of the high-temperature channel II 10 is communicated with the air outlet of the waste heat boiler 11, and the outlet is communicated with the inlet of the acid making unit 1;
a spraying mechanism is arranged in the concentration tower 13, the spraying mechanism comprises a water supply pipe and a spray head, the spray head is positioned below an air inlet pipe of the concentration tower 13, and a waste liquid outlet 17 of the acid making unit 1 is communicated with the water supply pipe of the spraying mechanism to supply water for the spraying mechanism; a circulating pipeline is arranged between a water supply pipe of the spraying mechanism and the bottom of the concentration tower 13, a circulating pump 14 is installed on the circulating pipeline, and the liquid at the bottom of the concentration tower 13 is extracted to circularly absorb SO in the acid making tail gas2(ii) a An exhaust pipe is arranged on the concentration tower 13, and the outlet of the exhaust pipe is communicated with the active coke adsorption; the neutralization tank 16 is communicated with the bottom of the concentration tower 13 through a drain pipe;
the incinerator 12 is provided with a combustion-supporting gas inlet, and the outlet of the incinerator 12 is communicated with the inlet of the waste heat boiler 11.
When the device is used, combustion-supporting gas at 120 ℃ enters the incinerator 12, coking and desulfurization waste salt is incinerated in the incinerator 12, high-temperature sulfur-containing flue gas at 1050 ℃ is generated and sequentially passes through the waste heat boiler 11 and the high-temperature channel II 10 and enters the acid making unit 1 to perform an acid making process. 190 ℃ converter gas generated in the acid making process enters a high-temperature channel I7 of a heat exchanger 5 through a converter gas outlet 2, 65 ℃ low-temperature acid making tail gas generated at the end of the acid making process enters a low-temperature channel I6 of the heat exchanger 5 through an acid making tail gas outlet 4, and heat exchange between the converter gas and the acid making tail gas is realized in the heat exchanger 5. The cooled converter gas returns to a conversion system of the acid making unit 1 through a conversion system inlet 3 to complete the subsequent acid making process, the acid making tail gas with the temperature raised to 135 ℃ after primary heating enters a low-temperature channel II 9 of the preheater 8, and the high-temperature channel II 10 of the preheater 8 is filled with high-temperature sulfur-containing flue gas with the temperature of 500 ℃ coming out of the waste heat boiler 11, so that the heat exchange between the sulfur-containing flue gas and the acid making tail gas can be realized in the preheater 8.
The sulfur-containing flue gas reduced to 350 ℃ enters an acid making unit 1, a sulfuric acid finished product with the mass fraction of more than or equal to 98% is prepared through an acid making process, and the acid making tail gas heated to 350 ℃ for the second time enters a concentration tower 13.
Waste water produced in the acid making process enters a water supply pipe of a spray mechanism of the concentration tower 13 through a waste liquid outlet 17, and is treated according to the following steps: acid makingThe liquid-gas ratio of the tail gas is 20:1, evaporation water is provided for the concentration tower 13, the acid making tail gas at 350 ℃ is sprayed and cooled, the exhaust temperature of the concentration tower 13 after spraying is about 65 ℃, at the moment, part of the waste water is evaporated to form water vapor, the water vapor is mixed into the exhaust gas of the concentration tower 13 and enters the active coke adsorption tower, the water vapor accounts for 5% of the exhaust gas, and the SO of the active coke in the active coke adsorption tower can be increased2The adsorption capacity and the desulfurization efficiency of the method enable the treated gas to reach the ultralow emission standard.
While the exhaust gas is treated, the circulating pump 14 extracts the acid liquor at the bottom of the concentration tower 13 to circularly absorb SO in the tail gas of acid making2The acid liquor concentration in the concentration tower 13 is increased, and when the acid liquor in the concentration tower 13 reaches a certain height, the acid liquor is sent to the neutralization tank 16 through a drain pipe, and after harmless treatment is carried out on the acid liquor by adding alkali and settling, the acid liquor returns to the factory for recycling.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the utility model, which is intended to be covered by the claims.
Claims (7)
1. The utility model provides a tail gas processing system of coking desulfurization waste salt preparation sulphuric acid which characterized in that includes: the system comprises an acid making unit (1), a heat exchanger (5), a preheater (8), a waste heat boiler (11) and a concentration tower (13);
a low-temperature channel I (6) and a high-temperature channel I (7) for heat exchange are arranged in the heat exchanger (5); the inlet of the low-temperature channel I (6) is communicated with the acid making tail gas outlet (4) of the acid making unit (1), and the outlet is communicated with the preheater (8); an inlet of the high-temperature channel I (7) is communicated with a converter gas outlet (2) of the acid making unit (1), an outlet of the high-temperature channel I is communicated with a converter system inlet (3) of the acid making unit (1), and the acid making tail gas is heated for one time by using the converter gas in the heat exchanger (5);
a low-temperature channel II (9) and a high-temperature channel II (10) for heat exchange are arranged in the preheater (8); the inlet of the low-temperature channel II (9) is communicated with the outlet of the low-temperature channel I (6), and the outlet is communicated with the gas inlet of the concentration tower (13); the inlet of the high-temperature channel II (10) is communicated with the gas outlet of the waste heat boiler (11), the outlet of the high-temperature channel II is communicated with the inlet of the acid making unit (1), and sulfur-containing flue gas discharged from the waste heat boiler (11) is used for secondarily heating acid making tail gas in the preheater (8).
2. The tail gas treatment system for preparing sulfuric acid from coking desulfurization waste salt as claimed in claim 1, characterized in that: the top of the concentration tower (13) is provided with an air inlet pipe communicated with the outlet of the low-temperature channel II (9); the acid making device is characterized in that a spraying mechanism is arranged in the concentration tower (13), the spraying mechanism comprises a water supply pipe and a spray head, the spray head is located below the air inlet pipe, and the spraying mechanism sprays acid making tail gas entering the concentration tower (13).
3. The tail gas treatment system for preparing sulfuric acid from coking desulfurization waste salt as claimed in claim 2, characterized in that: a circulating pipeline is arranged between a water supply pipe of the spraying mechanism and the bottom of the concentration tower (13), a circulating pump (14) is installed on the circulating pipeline, and liquid at the bottom of the concentration tower (13) is extracted to circularly absorb SO in the acid making tail gas2。
4. The tail gas treatment system for preparing sulfuric acid from coking desulfurization waste salt as claimed in claim 2, characterized in that: and a waste liquid outlet (17) of the acid making unit (1) is communicated with a water supply pipe of the spraying mechanism, and waste water is utilized to spray and exchange heat for acid making tail gas.
5. The tail gas treatment system for preparing sulfuric acid from coking desulfurization waste salt as claimed in claim 1, characterized in that: also comprises a gas purification device (15); an exhaust pipe is arranged on the concentration tower (13), and the outlet of the exhaust pipe is communicated with the gas purification device (15).
6. The tail gas treatment system for preparing sulfuric acid from coking desulfurization waste salt according to claim 5, characterized in that: the gas purification device (15) is an active coke adsorption tower.
7. The tail gas treatment system for preparing sulfuric acid from coking desulfurization waste salt as claimed in claim 1, characterized in that: also comprises a neutralization tank (16); the neutralization tank (16) is communicated with the bottom of the concentration tower (13) through a drain pipe.
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| CN202122914361.5U CN216604686U (en) | 2021-11-25 | 2021-11-25 | Tail gas treatment system for preparing sulfuric acid from coking desulfurization waste salt |
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| CN202122914361.5U CN216604686U (en) | 2021-11-25 | 2021-11-25 | Tail gas treatment system for preparing sulfuric acid from coking desulfurization waste salt |
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