CN214426458U - Blast furnace gas desulfurization system - Google Patents
Blast furnace gas desulfurization system Download PDFInfo
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- CN214426458U CN214426458U CN202120576631.3U CN202120576631U CN214426458U CN 214426458 U CN214426458 U CN 214426458U CN 202120576631 U CN202120576631 U CN 202120576631U CN 214426458 U CN214426458 U CN 214426458U
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Abstract
The utility model provides a blast furnace gas desulfurization system, includes cooling demineralization tower, attemperator, hydrolysis unit and smart desulfurizing tower, cooling demineralization tower divide into from bottom to top sprays cooling layer, desalination layer and defogging layer, attemperator is located cooling demineralization tower and hydrolysis unit, and the blast furnace gas after the dust removal gets into cooling demineralization tower lower part through attemperator, and the blast furnace gas of cryogenic temperature that discharges from cooling demineralization tower top gets into attemperator again, and gets into the hydrolysis unit with the blast furnace gas before getting into cooling demineralization tower in taking a breath, the hydrolysis catalyst has been arranged in the hydrolysis unit, and the blast furnace gas after the hydrolysis gets into smart desulfurizing tower lower part, divide into from bottom to top in the smart desulfurizing tower and spray cooling layer, sulphur absorbing layer and defogging laminarity. The desulfurization system improves the desulfurization efficiency and ensures the stable and safe desulfurization of the blast furnace gas.
Description
Technical Field
The utility model relates to a blast furnace gas desulfurization technical field, concretely relates to blast furnace gas desulfurization system.
Background
Blast furnace gas is a byproduct and an important energy source in the production of iron and steel enterprises, and the production and the use amount are large. Because the blast furnace gas used by iron and steel enterprises has numerous points and is limited by sites, if the blast furnace gas is treated in a conventional tail end treatment mode, the investment cost is very high; and a large amount of sulfides exist in the blast furnace gas, and the sulfides not only corrode pipelines and equipment, but also generate sulfur dioxide after combustion to pollute the environment. Therefore, the centralized desulfurization of blast furnace gas at the source is a more economical choice, but the application of the centralized desulfurization technology at the source is still blank at the present stage, and the cases of the domestic blast furnace gas desulfurization are fewer.
Moreover, the prior art suffers from the following drawbacks and deficiencies:
(1) the direct application of the coke oven gas desulfurization technology can remove inorganic sulfur (mainly H2S) in the blast furnace gas, but has no effect on removing organic sulfur (mainly COS) in the blast furnace gas.
(2) The improved coke oven gas desulfurization technology mainly changes the components of the desulfurization catalyst, has certain effect on removing organic sulfur (mainly COS) in the blast furnace gas, but has low efficiency.
(3) By adopting the 'hydrogenation catalysis + wet chemical absorption' desulfurization process technology, the hydrogenation catalyst is usually used at a temperature of between 250 ℃ and 400 ℃, the hydrogenation catalyst cannot be activated when the temperature is too low, and side reactions can occur when the temperature is too high. Meanwhile, the concentration of carbon monoxide and hydrogen in the raw material gas has certain requirements, and the hydrogenation catalyst is generally used for the hydrodesulfurization of the gas with the carbon monoxide content of less than 15 percent and the hydrogen content of more than 3 percent. The hydrogenation process is not suitable for removing the carbonyl sulfide of the blast furnace gas under the temperature condition or the gas component by combining the composition and the characteristics of the blast furnace gas.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a blast furnace gas desulfurization system adopts "cooling desalination + feed gas adjusts temperature + normal atmospheric temperature hydrolysis + wet process absorption" desulfurization process, and main process equipment contains cooling desalination part, the part that adjusts temperature, normal atmospheric temperature hydrolysis part, smart desulfurization part, doctor solution regeneration part, sulphur foam recovery part and other conventional parts, has improved desulfurization efficiency, has guaranteed the stable, safe desulfurization of blast furnace gas.
The technical scheme of the utility model as follows:
the utility model provides a blast furnace gas desulfurization system, includes cooling demineralization tower, attemperator, hydrolysis unit and smart desulfurizing tower, cooling demineralization tower divide into from bottom to top sprays cooling layer, desalination layer and defogging layer, attemperator is located cooling demineralization tower and hydrolysis unit, and the blast furnace gas after the dust removal gets into cooling demineralization tower lower part through attemperator, and the cooling is cooled through spraying the cooling layer earlier, then the desalination washes away simple substance sulphur and the salt material in the blast furnace gas, and follow the top of cooling demineralization tower behind the liquid drop in the blast furnace gas is detached to the defogging layer again and discharge. The method comprises the following steps that low-temperature blast furnace gas discharged from the top of a cooling and desalting tower enters a temperature regulating device, the low-temperature blast furnace gas enters a hydrolysis device together with blast furnace gas before entering the cooling and desalting tower after being ventilated, a hydrolysis catalyst is arranged in the hydrolysis device, carbon-based sulfur (COS) in the blast furnace gas is converted into hydrogen sulfide (H2S) by the hydrolysis catalyst, the hydrolyzed blast furnace gas enters the lower part of a fine desulfurization tower, the fine desulfurization tower is internally provided with a spraying and cooling layer, a sulfur absorption layer and a demisting layer from bottom to top, the blast furnace gas is in reverse contact with a desulfurization solution, hydrogen sulfide (H2S) in the blast furnace gas is removed by sodium carbonate (Na2CO3) in the desulfurization solution, and finally the blast furnace gas is discharged after being demisted.
Further, this system still includes demineralized water holding vessel and circulating tank, the demineralized water holding vessel provides the demineralized water to the circulating tank, the circulating tank provides the demineralized water to cooling desalination tower desalination layer to retrieve the demineralized water.
Preferably, the demineralized water storage tank is also connected with the tops of the cooling desalting tower and the fine desulfurization tower respectively. And (4) operating for a certain time, starting a clear water pump of the desalted water storage tank, and washing demisting layers at the tops of the cooling desalting tower and the fine desulfurization tower respectively.
According to the blast furnace gas desulfurization system, the hydrolysis catalyst in the hydrolysis device comprises the catalyst taking the aluminum oxide as the carrier, and the hydrolysis catalyst is low in price, good in interchangeability and easy to purchase.
Further, the catalytic temperature range of the hydrolysis catalyst is 45-100 ℃.
In the blast furnace gas desulfurization system, the demisting layer in the temperature-reducing desalting tower comprises a tube bundle demister. And the demisting layer in the fine desulfurization tower comprises a flat demister.
The blast furnace gas desulfurization system further comprises a desulfurization solution regeneration device and a reflux tank, wherein the reflux tank receives the desulfurization solution provided by the desulfurization storage tank and pumps the desulfurization solution into the sulfur absorption layer of the fine desulfurization tower, the desulfurization solution recovery device in the fine desulfurization tower recovers the desulfurization solution and introduces the desulfurization solution into the regeneration device, the regeneration device is of a tank-type structure, the bottom of the regeneration device is connected with an oxidation fan, and the regenerated desulfurization solution is introduced into the reflux tank.
Preferably, the desulfurization solution flowing out of the fine desulfurization tower automatically flows into the regeneration tank by utilizing the height difference, and the original process of firstly feeding into the tank body and then pumping into the tank body by using a pump is omitted. The desulfurization liquid entering the regeneration tank uniformly flows into the cross section of the regeneration tank according to the distributed distribution pipes, is uniformly floated on the bottom to fully mix and oxidize the compressed air, so that the full oxidation regeneration process is completed, and the desulfurization liquid overflows from the regeneration tank and enters the fine desulfurization tower to be recycled.
The blast furnace gas desulfurization system further comprises a sulfur foam recovery device, wherein the sulfur foam recovery device comprises a sulfur foam storage tank and a sulfur paste sorting device, the sulfur foam storage tank is connected with the regeneration device and stores sulfur foam from the regeneration device, and the sulfur paste sorting device is connected with the sulfur foam storage tank and separates the sulfur foam into sulfur paste and filtrate. The sulfur paste sorting device comprises a vacuum dehydration belt conveyor.
In the blast furnace gas desulfurization system, one end of the initial blast furnace gas inlet of the temperature adjusting device is also connected with the purging interface, and correspondingly, one end of the blast furnace gas led out of the top of the fine desulfurization tower after desulfurization is also connected with the purging interface. Before the system works, inert gas (nitrogen) is firstly used for purging system equipment, pipelines and flues, so that safety accidents caused after blast furnace gas enters are prevented.
The utility model discloses blast furnace gas desulfurization system's concrete theory of operation:
firstly removing elemental sulfur and sulfate substances in blast furnace gas, eliminating the influence of the elemental sulfur and the sulfate substances on a hydrolysis catalyst, then adjusting the temperature of the blast furnace gas to a proper hydrolysis temperature range of 60-70 ℃, converting carbon-based sulfur (COS) in the blast furnace gas into hydrogen sulfide (H2S) by the hydrolysis catalyst, adjusting the temperature of the blast furnace gas to 40-50 ℃, entering a desulfurization area, reversely contacting the blast furnace gas with desulfurization liquid, removing the hydrogen sulfide (H2S) from the blast furnace gas by sodium carbonate (Na2CO3) in the desulfurization liquid, and finally demisting and discharging the blast furnace gas, thereby completing the desulfurization process of the blast furnace gas. The desulfurization solution discharged from the desulfurization tower enters a regeneration device, and sodium carbonate (Na2CO3) in the desulfurization solution is regenerated under the action of a catalyst and oxygen and returns to a desulfurization system for recycling. The sulfur foam discharged from the regeneration device enters a separation device to complete the solid-liquid separation process, the separated sulfur paste is further processed to obtain sulfur or other products, and the filtered solution is returned to the desulfurization system for continuous use.
Simplified chemical reaction formula:
COS + H2O ═ H2S + CO2 (conditions: hydrolysis catalyst, temperature)
Hydrolysis catalyst: the main components are active components such as aluminum oxide (Al2O3) and K2O, and are granular or blocky.
2H2S + O2 ═ 2H2O +2S ↓ (condition: catalyst, oxygen, at certain temperature)
Catalyst: the catalyst which is easily purchased in the markets of 888, PDS, tannin extract and the like and has low price can be selected.
The utility model discloses for prior art gained beneficial effect lie in:
1. the utility model discloses a to blast furnace gas desalt, the processing that adjusts the temperature, remove unfavorable composition in the blast furnace gas, for the hydrolysis catalyst builds good hydrolysis transformation environment, prolong hydrolysis catalyst life, create a stable, safe, efficient desulfurization condition of blast furnace gas.
2. The utility model discloses a part that adjusts the temperature carries out the broad width adjustment to blast furnace gas temperature, and is more extensive to hydrolysis catalyst selectivity, reduces purchasing of iron and steel enterprise, use cost.
3. The utility model has the advantages that the fine desulfurization tower is adjusted to be a structure integrating concentration, cooling and absorption, so that the occupied area is saved, and the control is convenient; the mode of discharging the desulfurization solution from the fine desulfurization tower and entering the regeneration device is self-flowing, so that the power consumption is reduced.
4. The utility model discloses a select for use vacuum belt dewatering equipment to be sulfur paste sorting facilities, improve automated production efficiency, realize unmanned management.
Drawings
The aspects and advantages of the present application will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
In the drawings:
FIG. 1 is a schematic structural view of a blast furnace gas desulfurization system according to this embodiment;
the components represented by the reference numerals in the figures are:
1. the system comprises a cooling desalting tower, 11, a circulating tank, 12, a washing pump, 13, a cooling pump, 14, a tube bundle demister, 15 and a first explosion-proof electric valve; 2, a temperature adjusting device; 3 hydrolysis device, 31, hydrolysis catalyst; 4. the system comprises a fine desulfurization tower, 41, a reflux tank, 42, a desulfurization pump, 43, a temperature regulating pump, 44, a first liquid seal device, 45, a flat demister, 46 and a second explosion-proof electric valve; 5. a regenerating device 51, a second liquid seal device 52 and an oxidation fan; 6. a sulfur foam recovery device, 61, a sulfur foam storage tank, 62, a vacuum dehydration belt conveyor, 63, a filtrate storage tank, 64, a sulfur paste storage tank, 65 and a filtrate pump; 7. a doctor solution storage tank 71, a doctor solution preparation tank; 8. a demineralized water storage tank; 9. and (4) an accident pool.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. It should be noted that these embodiments are provided so that this disclosure can be more completely understood and fully conveyed to those skilled in the art, and the present disclosure may be implemented in various forms without being limited to the embodiments set forth herein.
The directions mentioned in the present invention, front and back, left and right, etc., are only used to express the relative position relationship, and are not restricted by any specific direction reference in practical application.
Examples
Referring to fig. 1, the blast furnace gas desulfurization system of the present embodiment includes a temperature reduction and desalination portion, a temperature adjustment portion, a normal temperature hydrolysis portion, a fine desulfurization portion, a desulfurization solution regeneration portion, a sulfur foam recovery portion, and other conventional portions.
Specifically, the cooling desalination part comprises a cooling desalination tower 1, and the cooling desalination tower 1 is divided into a spraying cooling layer, a desalination layer and a tube bundle demister 14 from bottom to top. Blast furnace gas from a bag-type dust remover enters a temperature-reducing and desalting tower 1 at about 150-. And the washing solution from the cooling desalting tower is recycled and enters the desulfurization solution regeneration part.
Further, a cooling pump 13 is arranged at the lower part of the cooling desalting tower 1 and used for pumping water at the bottom of the cooling desalting tower 1 into the spray pipe to cool the blast furnace gas.
Further, cooling desalination tower 1 still is connected with demineralized water holding vessel 8 and circulating tank 11, demineralized water holding vessel 8 is to 1 bottom pump clear water of cooling desalination tower, provides the demineralized water to circulating tank 11, circulating tank 11 provides the demineralized water through washing pump 12 to 1 desalination layer of cooling desalination tower to retrieve the demineralized water.
In this embodiment, the temperature adjusting part includes a temperature adjusting device 2, the temperature adjusting device 2 is located between the temperature-reducing and desalting tower 1 and the hydrolysis device 3, and the dedusted blast furnace gas enters the lower part of the temperature-reducing and desalting tower 1 through the temperature adjusting device 2 and is then discharged from the top of the temperature-reducing and desalting tower 1. The blast furnace gas from the temperature-reducing and desalting tower 1 and the blast furnace gas before entering the temperature-reducing and desalting tower 1 are heated to 60-70 ℃ in a heat exchanger, and the temperature-regulating process is completed.
Further, the blast furnace gas after temperature adjustment enters a hydrolysis device 3, a hydrolysis catalyst 31 is arranged in the hydrolysis device 3, and the hydrolysis catalyst 31 converts carbon-based sulfur (COS) in the blast furnace gas into hydrogen sulfide (H)2S). Preferably, the hydrolysis catalyst 31 can be a catalyst using aluminum oxide as a carrier, which is low in price, good in interchangeability and easy to purchase, and the catalytic temperature range is 45-100 ℃. The direct removal of the carbon-based sulfur (COS) is not obvious, but the carbon-based sulfur (COS) is converted into hydrogen sulfide (H)2S), can be easily removed by alkaline liquids.
In this embodiment, the main equipment of the fine desulfurization part is a fine desulfurization tower 4, the hydrolyzed blast furnace gas enters the lower part of the fine desulfurization tower 4, the fine desulfurization tower 4 is divided into a spray cooling layer, a sulfur absorption layer and a flat demister 45 from bottom to top, the spray cooling layer pumps the water into the spray cooling layer through a temperature adjusting pump 43 to cool the blast furnace gas to 30-40 ℃, the sulfur absorption layer comprises a third absorption layer, the cooled blast furnace gas is in reverse contact with a desulfurization solution, and sodium carbonate (Na) in the desulfurization solution is obtained2CO3) Removing hydrogen sulfide (H) from blast furnace gas2S), after passing through the three-stage absorption layer, the content of hydrogen sulfide in blast furnace gas is reduced to 20mg/Nm3Thereafter, the blast furnace gas enters the flat mist eliminator 45 again to remove droplets, and is discharged to other processes. Thus, the blast furnace gas completes the desulfurization process. In the 4 towers of fine desulfurization, intelligent cooling and absorption are combined into one tower, so that the operation is convenient to control.
In this embodiment, the demineralized water storage tank 8 is also connected with the tops of the cooling desalting tower 1 and the fine desulfurization tower 4 respectively. And (4) operating for a certain time, starting a clear water pump of the desalted water storage tank 8, and washing demisting layers at the tops of the cooling desalting tower 1 and the fine desulfurization tower 4 respectively.
In this embodiment, the desulfurization solution regeneration part includes a desulfurization solution regeneration device 5 and a reflux tank 41, the reflux tank 41 receives the desulfurization solution provided by the desulfurization storage tank 7, and pumps the desulfurization solution into the sulfur absorption layer of the fine desulfurization tower 4 through a desulfurization pump 42, and the desulfurization solution in the desulfurization storage tank 7 is prepared by a denitration solution preparation tank 41 and pumped into the desulfurization storage tank 7. The desulfurization solution recovery device in the fine desulfurization tower 4 recovers the desulfurization solution and guides the desulfurization solution into the regeneration device 5, the regeneration device 5 is of a tank type structure, the bottom of the regeneration device is connected with an oxidation fan, and the regenerated desulfurization solution is guided into the reflux tank 41.
Preferably, the desulfurization solution flowing out of the fine desulfurization tower 4 automatically flows into the regeneration tank by utilizing the height difference, and the original process of firstly feeding into the tank body and then pumping into the tank body by using a pump is omitted. The desulfurization liquid entering the regeneration tank uniformly flows into the cross section of the regeneration tank according to a distributed distribution pipe, is fully mixed and oxidized with the uniformly floated compressed air sent by the oxidation fan 52 at the bottom to complete a full oxidation regeneration process, and overflows out of the regeneration tank and enters the fine desulfurization tower 4 for recycling. The separated sulfur foam overflows and enters a sulfur foam recovery device 6.
Further, a first liquid seal device 44 is provided between the fine desulfurization tower 4 and the reflux tank 41, and a second liquid seal device 51 is provided between the reflux tank 41 and the regeneration device 5.
In this embodiment, the sulfur foam recycling device 6 includes a sulfur foam storage tank 61 and a sulfur paste sorting device, the sulfur foam storage tank 61 is connected to the regeneration device 5, and stores the sulfur foam from the regeneration device 5, the sulfur paste sorting device is connected to the sulfur foam storage tank 61, the sulfur paste sorting device is a vacuum dewatering belt conveyor 62, when the sulfur foam reaches a high liquid level in the sulfur foam storage tank 61, the vacuum dewatering belt conveyor 62 is opened to separate the sulfur foam, and the separated sulfur paste enters a sulfur paste storage tank 64 for temporary storage, and can be solidified to produce sulfur, or for other purposes. The separated filtrate enters a filtrate tank 63. When the liquid level in the filtrate storage tank 63 reaches a high liquid level, the filtrate pump 65 is started to return the filtrate to the desulfurization system.
In this embodiment, one end of the initial blast furnace gas inlet of the temperature adjusting device 2 is further connected to a purging interface, and correspondingly, one end of the blast furnace gas led out of the top of the fine desulfurization tower 4 after desulfurization is also connected to the purging interface. Before the system works, inert gas (nitrogen) is firstly used for purging system equipment, pipelines and flues, so that safety accidents caused after blast furnace gas enters are prevented.
In this embodiment, the first explosion-proof electric damper 15 is connected to the inlet duct for the blast furnace gas after dust removal, and the second explosion-proof electric damper 46 is connected to the outlet duct for the blast furnace gas after desulfurization. The bottoms of all the devices are also connected with an accident pool 9 through pipelines. So as to ensure the operation safety of the system.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A blast furnace gas desulfurization system is characterized by comprising a cooling desalting tower (1), a temperature regulating device (2), a hydrolysis device (3) and a fine desulfurization tower (4), wherein the cooling desalting tower (1) is divided into a spraying cooling layer, a desalting layer and a demisting layer from bottom to top, the temperature regulating device (2) is positioned between the cooling desalting tower (1) and the hydrolysis device (3), dedusted blast furnace gas enters the lower part of the cooling desalting tower (1) through the temperature regulating device (2), the low-temperature blast furnace gas discharged from the top of the cooling desalting tower (1) enters the temperature regulating device (2) again, and enters the hydrolysis device (3) after being ventilated with the blast furnace gas before entering the cooling desalting tower (1), a hydrolysis catalyst (31) is arranged in the hydrolysis device (3), the hydrolyzed blast furnace gas enters the lower part of the fine desulfurization tower (4), the fine desulfurization tower (4) is divided into a spraying cooling layer from bottom to top, a sulfur absorbing layer and a defogging layer.
2. The blast furnace gas desulfurization system according to claim 1, further comprising a demineralized water storage tank (8) and a recycle tank (11), wherein the demineralized water storage tank (8) supplies demineralized water to the recycle tank (11), and the recycle tank (11) supplies demineralized water to the desalting layer of the temperature-reducing desalting tower (1) and recovers the demineralized water.
3. The blast furnace gas desulphurization system according to claim 2, wherein the demineralized water storage tank (8) is further connected to the tops of the temperature-reducing desalting tower (1) and the fine desulphurization tower (4), respectively.
4. The blast furnace gas desulfurization system according to claim 1, wherein the hydrolysis catalyst (31) in the hydrolysis unit (3) comprises an alumina-supported catalyst.
5. The blast furnace gas desulfurization system according to claim 4, wherein the hydrolysis catalyst (31) has a catalytic temperature range of 45-100 ℃.
6. The blast furnace gas desulfurization system according to claim 1, characterized in that the demister layer in the temperature-reducing desalting tower (1) comprises a tube bundle demister (14).
7. A blast furnace gas desulphurisation system according to claim 1 wherein the demister layer in the fine desulphurisation tower (4) comprises a plate demister (45).
8. The blast furnace gas desulfurization system according to claim 1, further comprising a desulfurization solution regeneration device (5) and a reflux tank (41), wherein the reflux tank (41) receives the desulfurization solution provided by the desulfurization storage tank (7) and pumps the desulfurization solution into the sulfur absorption layer of the fine desulfurization tower (4), a desulfurization solution recovery device in the fine desulfurization tower (4) recovers the desulfurization solution and guides the desulfurization solution into the regeneration device (5), the bottom of the regeneration device (5) is connected with an oxidation fan (52), and the regenerated desulfurization solution is guided into the reflux tank (41).
9. The blast furnace gas desulfurization system according to claim 8, further comprising a sulfur foam recovery unit (6), wherein the sulfur foam recovery unit (6) comprises a sulfur foam storage tank (61) and a sulfur paste separation unit, the sulfur foam storage tank (61) is connected to the regeneration unit (5) and stores the sulfur foam from the regeneration unit (5), and the sulfur paste separation unit is connected to the sulfur foam storage tank (61) and separates the sulfur foam into sulfur paste and filtrate.
10. The blast furnace gas desulfurization system according to claim 1, wherein one end of the initial blast furnace gas inlet of the temperature adjusting device (2) is further connected with a purging interface, and correspondingly, one end of the blast furnace gas led out of the top of the fine desulfurization tower (4) after desulfurization is also connected with a purging interface.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114381306A (en) * | 2022-01-19 | 2022-04-22 | 北京北科环境工程有限公司 | High-selectivity blast furnace gas fine desulfurization purification method |
| CN114381306B (en) * | 2022-01-19 | 2022-10-14 | 北京北科环境工程有限公司 | High-selectivity blast furnace gas fine desulfurization purification method |
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