CN113834340A - Low-temperature desulfurization and denitrification method and system for flue gas of sintering machine of steel mill - Google Patents
Low-temperature desulfurization and denitrification method and system for flue gas of sintering machine of steel mill Download PDFInfo
- Publication number
- CN113834340A CN113834340A CN202111143263.4A CN202111143263A CN113834340A CN 113834340 A CN113834340 A CN 113834340A CN 202111143263 A CN202111143263 A CN 202111143263A CN 113834340 A CN113834340 A CN 113834340A
- Authority
- CN
- China
- Prior art keywords
- flue gas
- adsorbent
- discharged
- precooler
- low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 183
- 239000003546 flue gas Substances 0.000 title claims abstract description 178
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 57
- 230000023556 desulfurization Effects 0.000 title claims abstract description 57
- 238000005245 sintering Methods 0.000 title claims abstract description 56
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 47
- 239000010959 steel Substances 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000001179 sorption measurement Methods 0.000 claims abstract description 55
- 238000007599 discharging Methods 0.000 claims abstract description 27
- 239000003463 adsorbent Substances 0.000 claims description 98
- 230000008929 regeneration Effects 0.000 claims description 47
- 238000011069 regeneration method Methods 0.000 claims description 47
- 239000007789 gas Substances 0.000 claims description 37
- 238000001816 cooling Methods 0.000 claims description 33
- 239000002253 acid Substances 0.000 claims description 22
- 239000000112 cooling gas Substances 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 10
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 8
- 239000000428 dust Substances 0.000 description 14
- 239000003517 fume Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000002594 sorbent Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
- B01D2259/4009—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating using hot gas
Abstract
The invention discloses a low-temperature desulfurization and denitrification method and system for flue gas of a sintering machine of a steel mill, wherein the low-temperature desulfurization and denitrification method for flue gas of the sintering machine of the steel mill comprises the following steps: dedusting the flue gas; reducing the temperature of the flue gas to below 20 ℃; introducing the flue gas into an adsorption tower for desulfurization and denitrification; and discharging the flue gas. The low-temperature desulfurization and denitrification method for the flue gas of the sintering machine in the steel mill does not need to heat the flue gas, and has high denitrification efficiency.
Description
Technical Field
The invention relates to the technical field of flue gas treatment, in particular to a low-temperature desulfurization and denitrification method and system for flue gas of a sintering machine in a steel mill.
Background
The iron and steel industry plays an important role in national economy in China, is also a large pollution discharge household, and a sintering process is one of the more serious links causing pollution in the production process of iron and steel enterprises. The pollutants generated by the sintering process mainly comprise dust and SOx、NOxAnd the like, and acidic gaseous pollutants.
In the related technology, the flue gas generated by the sintering process is denitrated by the SCR denitration process, the temperature of the flue gas generated by the sintering process is 120-180 ℃, the SCR denitration process is adopted, the flue gas is heated by combustion, secondary pollution is easily caused, and the denitration efficiency is low.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the embodiment of the invention provides a low-temperature desulfurization and denitrification method for flue gas of a sintering machine in a steel mill, which does not need to heat the flue gas and has high denitrification efficiency.
The embodiment of the invention provides a low-temperature desulfurization and denitrification system for flue gas of a sintering machine in a steel mill, which does not need to heat the flue gas during desulfurization and denitrification and has high denitrification efficiency.
The low-temperature desulfurization and denitrification method for the flue gas of the sintering machine in the steel mill comprises the following steps of:
dedusting the flue gas;
reducing the temperature of the flue gas to below 20 ℃;
introducing the flue gas into an adsorption tower for desulfurization and denitrification;
and discharging the flue gas.
According to the low-temperature desulfurization and denitration method for the flue gas of the sintering machine in the steel mill, the temperature of the flue gas is reduced to be lower than 20 ℃, and then the flue gas is adsorbed by the adsorption tower, so that the flue gas is desulfurized and denitrated.
Therefore, the low-temperature desulfurization and denitrification method for the flue gas of the sintering machine in the steel mill, provided by the embodiment of the invention, does not need to heat the flue gas, and is high in denitrification efficiency.
In some embodiments, after the flue gas is introduced into the adsorption tower for desulfurization and denitration,
discharging the adsorbent in the adsorption column;
and sending the discharged adsorbent to a regeneration tower to prepare acid gas.
In some embodiments, after said passing said discharged adsorbent to a regeneration column for acid gas,
discharging the adsorbent in the regeneration column;
cooling the discharged adsorbent;
feeding the adsorbent to the adsorption column.
In some embodiments, said cooling said discharged sorbent comprises:
cold feeding the discharged adsorbent into a precooler;
introducing cooling gas into the precooler to cool the precooler.
In some embodiments, after the flue gas is passed into an adsorption tower for desulfurization and denitration, the flue gas is passed into the precooler before the flue gas is discharged, and the flue gas forms the cooling gas.
The low-temperature desulfurization and denitrification system for the flue gas of the sintering machine of the steel mill comprises the following components:
a sintering machine including a flue gas discharge port;
the cooling system comprises a first flue gas inlet and a first flue gas outlet, and the flue gas discharge port is communicated with the first flue gas inlet so as to introduce the flue gas into the cooling system, thereby reducing the temperature of the flue gas to below 20 ℃;
the adsorption tower comprises a first feed port, a first discharge port, a second flue gas inlet and a second flue gas outlet, the first flue gas outlet is communicated with the second flue gas inlet so as to introduce the flue gas into the adsorption tower to desulfurize and denitrate the flue gas, the first feed port is used for adding an adsorbent into the adsorption tower, and the first discharge port is used for discharging the adsorbent in the adsorption tower;
the regeneration tower, the regeneration tower includes sour gas export, second feed inlet and second discharge gate, the second feed inlet be used for to add in the regeneration tower first discharge gate exhaust adsorbent, the second discharge gate is used for discharging adsorbent in the regeneration tower, the regeneration tower still includes the heating tube, the heating tube can let in high temperature steam, so that the heating adsorbent in the regeneration tower, thereby make adsorbent in the regeneration tower releases sour gas, the sour gas export is used for discharging sour gas.
According to the low-temperature desulfurization and denitrification system for the flue gas of the sintering machine in the steel mill, the temperature of the flue gas can be reduced to be lower than 20 ℃, and then the flue gas is adsorbed by the adsorption tower, so that the flue gas is desulfurized and denitrified, the flue gas does not need to be heated, and the denitrification efficiency is high.
In addition, the low-temperature desulfurization and denitrification system for the flue gas of the sintering machine in the steel mill can heat the adsorbent through the regeneration tower, so that acid gas is prepared, and the adsorbent can be recycled.
In some embodiments, the low-temperature desulfurization and denitrification system for flue gas of a sintering machine in a steel mill further comprises a precooler, wherein the precooler comprises a third feeding port and a third discharging port, the third feeding port is used for feeding the adsorbent discharged from the second discharging port into the precooler, the third discharging port is used for discharging the adsorbent in the precooler, and the precooler further comprises a cooling pipeline which is used for introducing cooling gas so as to cool the adsorbent in the precooler.
In some embodiments, the cooling duct comprises a third flue gas inlet and a third flue gas outlet, the third flue gas inlet being in communication with the second flue gas outlet so that flue gas in the adsorption tower passes into the cooling duct, the flue gas forming the cooling gas.
In some embodiments, the low-temperature desulfurization and denitrification system for flue gas of a sintering machine in a steel mill further comprises a first conveying device, wherein the first conveying device is used for conveying the adsorbent discharged from the first discharge hole to the second feed hole of the regeneration tower so as to add the adsorbent discharged from the first discharge hole into the regeneration tower.
In some embodiments, the low-temperature desulfurization and denitrification system for flue gas of a sintering machine in a steel mill further comprises a second conveying device and a third conveying device, the second conveying device is used for conveying the adsorbent discharged from the second discharge hole to the third feed hole of the precooler so as to add the adsorbent discharged from the second discharge hole into the precooler,
the third conveying device is used for conveying the adsorbent discharged from the third discharge port to the first feed port of the adsorption tower so as to add the adsorbent discharged from the third discharge port into the adsorption tower.
Drawings
FIG. 1 is a schematic diagram of a low-temperature desulfurization and denitrification system for flue gas of a sintering machine of a steel mill according to an embodiment of the invention.
FIG. 2 is a schematic diagram of a low-temperature desulfurization and denitrification system for flue gas of a sintering machine of a steel mill according to an embodiment of the invention.
Reference numerals:
a sintering machine 1; a flue gas discharge port 101;
a cooling system 2; a first flue gas inlet 201; a first flue gas outlet 202;
an adsorption tower 3; a first feed inlet 301; a first discharge port 302; a second flue gas inlet 303; a second flue gas outlet 304;
a regeneration tower 4; a second feed port 401; a second discharge port 402; an acid gas outlet 403; a hot gas inlet 404; a hot gas outlet 405;
a precooler 5; a third feed port 501; a third discharge port 502; a third flue gas inlet 503; a third flue gas outlet 504;
a first conveyance device 61; a second conveyance device 62; the third conveyance device 63;
a chimney 7;
a dust remover 8;
a first induced draft fan 91;
a second induced draft fan 92.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The low-temperature desulfurization and denitrification system for the flue gas of the sintering machine of the steel mill according to the embodiment of the invention is described below with reference to the accompanying drawings.
As shown in fig. 1, the low-temperature desulfurization and denitrification system for flue gas of a sintering machine 1 of a steel mill according to an embodiment of the present invention includes a sintering machine 1, a cooling system 2, an adsorption tower 3, and a regeneration tower 4.
The sintering machine 1 comprises a fume discharge port 101, the cooling system 2 comprises a first fume inlet 201 and a first fume outlet 202, and the fume discharge port 101 is communicated with the first fume inlet 201. Therefore, the low-temperature desulfurization and denitrification system for the flue gas of the sintering machine 1 in the steel mill can introduce the flue gas into the cooling system 2, so that the temperature of the flue gas is reduced to be below 20 ℃.
It can be understood that the temperature of the flue gas discharged by the sintering machine 1 is 120-180 ℃, so that the flue gas discharged by the sintering machine 1 needs to enter the cooling system 2 through the first flue gas inlet 201 to be cooled, thereby being beneficial to improving the adsorption efficiency of the adsorption tower 3.
Specifically, the temperature of the flue gas discharged from the first flue gas outlet 202 of the cooling system 2 is-5 ℃ to 5 ℃. Preferably, the temperature of the flue gas discharged from the first flue gas outlet 202 of the cooling system 2 is 0 ℃.
The adsorption tower 3 comprises a first feed port 301, a first discharge port 302, a second flue gas inlet 303 and a second flue gas outlet 304. The first flue gas outlet 202 is communicated with the second flue gas inlet 303, so that flue gas exhausted from the first flue gas outlet 202 of the cooling system 2 can be introduced into the adsorption tower 3, and desulfurization and denitration are performed on the flue gas.
It can be understood that the adsorbent is arranged in the adsorption tower 3, and the adsorbent has high adsorption efficiency on low-temperature flue gas with the temperature below 20 ℃, so that the desulfurization and denitration efficiency of the flue gas can be improved.
Specifically, the adsorbent in the adsorption tower 3 may be activated carbon, but may be other adsorbents capable of adsorbing acidic gaseous pollutants.
The regeneration tower 4 includes a heating conduit, an acid gas outlet 403, a second feed port 401, and a second discharge port 402. The first inlet 301 is used for feeding the adsorbent into the adsorption tower 3, and the first outlet 302 is used for discharging the adsorbent in the adsorption tower 3. The second inlet 401 is used for feeding the adsorbent discharged from the first outlet 302 into the regeneration tower 4, and the second outlet 402 is used for discharging the adsorbent from the regeneration tower 4. The heating pipe is used to heat the adsorbent in the regeneration tower 4, so that the adsorbent in the regeneration tower 4 releases acid gas, and the acid gas outlet 403 is used to discharge the acid gas.
Specifically, the heating duct includes a hot gas inlet 404 and a hot gas outlet 405, and high-temperature steam can be introduced into the heating duct from the hot gas inlet 404, and the high-temperature steam exchanges heat with the adsorbent in the regeneration tower 4, so that the temperature of the adsorbent is raised, and then the high-temperature steam is discharged from the hot gas outlet 405.
That is, the regeneration tower 4 can heat the adsorbent in the adsorption tower 3, so that the acidic gaseous pollutants adsorbed by the adsorbent are released, and the adsorbent can be used for preparing acid gas.
According to the low-temperature desulfurization and denitrification system for the flue gas of the sintering machine 1 in the steel plant, disclosed by the embodiment of the invention, the temperature of the flue gas can be reduced to be lower than 20 ℃, and then the flue gas is adsorbed by the adsorption tower 3, so that the flue gas is desulfurized and denitrated without being heated, and the denitration efficiency is high.
In addition, the low-temperature desulfurization and denitrification system for the flue gas of the sintering machine 1 in the steel mill according to the embodiment of the invention can heat the adsorbent through the regeneration tower 4, so that acid gas is prepared, and the adsorbent can be recycled.
In some embodiments, as shown in fig. 2, the low-temperature desulfurization and denitration system for flue gas of sintering machine 1 in steel mill according to the embodiment of the present invention further includes a first conveyor 61, and the first conveyor 61 is capable of conveying the adsorbent discharged from the first discharge port 302 to the second feed port 401 of the regeneration tower 4, so as to add the adsorbent discharged from the first discharge port 302 into the regeneration tower 4.
Therefore, the first transport device 61 can transport the adsorbent discharged from the adsorption tower 3 to the regeneration tower 4, and release the acid gas adsorbed by the adsorbent to produce the acid gas, so that the adsorbent can be recycled.
In some embodiments, the low-temperature desulfurization and denitrification system for flue gas of sintering machine 1 in steel mill according to the embodiments of the present invention further includes a precooler 5.
Precooler 5 comprises a cooling conduit, a third inlet 501 and a third outlet 502. Third inlet 501 is used for adding the adsorbent discharged from second outlet 402 into precooler 5, third outlet 502 is used for discharging the adsorbent in precooler 5, and the cooling pipeline is used for introducing cooling gas which can cool the adsorbent in precooler 5.
That is, the material discharged from the second discharge port 402 of the regeneration tower 4 can be fed into the precooler 5 through the third feed port 501
In some embodiments, as shown in fig. 1 and 2, the cooling duct comprises a third flue gas inlet 503 and a third flue gas outlet 504, and the third flue gas inlet 503 is communicated with the second flue gas outlet 304, so that the flue gas in the adsorption tower 3 can be introduced into the cooling duct, and the flue gas forms cooling gas, thereby cooling the adsorbent in the precooler 5.
In some embodiments, as shown in fig. 2, the low-temperature desulfurization and denitrification system for flue gas of sintering machine 1 in a steel mill according to an embodiment of the present invention further includes a second conveyor 62 and a third conveyor 63, where the second conveyor 62 is configured to convey the adsorbent discharged from second discharge port 402 to a third feed port 501 of precooler 5, so as to add the adsorbent discharged from second discharge port 402 into precooler 5. The third conveying device 63 is used for conveying the adsorbent discharged from the third discharge port 502 to the first feed port 301 of the adsorption tower 3, so as to add the adsorbent discharged from the third discharge port 502 into the adsorption tower 3.
Therefore, the first conveyor 61 can convey the adsorbent discharged from the adsorption tower 3 to the regeneration tower 4, the second conveyor 62 can convey the adsorbent discharged from the regeneration tower 4 to the precooler 5 for cooling, and the third conveyor 63 can convey the adsorbent discharged from the precooler 5 to the adsorption tower 3, thereby recycling the adsorbent.
It will be appreciated that the first, second and third conveyors 61, 62, 63 may be excavators, loaders or other devices capable of transporting material.
In some embodiments, as shown in fig. 2, the low-temperature desulfurization and denitrification system for flue gas of sintering machine 1 in steel mill according to the embodiment of the present invention further includes a dust remover 8. The dust remover 8 comprises a gas inlet and a gas outlet, the gas inlet of the dust remover 8 is communicated with the flue gas discharge port 101 so as to introduce the flue gas into the dust remover 8, and the gas outlet of the dust remover 8 is communicated with the first flue gas inlet 201 so as to communicate the flue gas discharge port 101 with the first flue gas inlet 201.
Therefore, the dust remover 8 can filter the dust in the flue gas to ensure that the dust content in the flue gas reaches the standard of 10mg/m 3.
In some embodiments, as shown in fig. 2, the low-temperature desulfurization and denitrification system for flue gas of a sintering machine 1 in a steel mill according to an embodiment of the present invention further includes a first induced draft fan 91 and a second induced draft fan 92. First draught fan 91 is established between cooling system 2 and dust remover 8, the air intake of first draught fan 91 and the gas outlet intercommunication of dust remover 8, the air outlet and the first gas inlet 201 intercommunication of first draught fan 91 to make the gas outlet intercommunication of first gas inlet 201 and dust remover 8.
Therefore, the first induced draft fan 91 can discharge the flue gas of the gas outlet of the dust collector 8 into the cooling system 2.
The air inlet of the second induced draft fan 92 is communicated with the acid gas outlet 403, so that the second induced draft fan 92 can exhaust the acid gas at the acid gas outlet 403.
As shown in fig. 2, the low-temperature desulfurization and denitrification system for flue gas of sintering machine 1 in steel mill according to the embodiment of the present invention further includes a chimney 7, and an inlet of chimney 7 is communicated with third flue gas outlet 504 of precooler 5, so that flue gas can be discharged.
The method for low-temperature desulfurization and denitration of the flue gas of the sintering machine 1 of the steel mill according to the embodiment of the invention is described below.
The low-temperature desulfurization and denitrification method for the flue gas of the sintering machine 1 in the steel mill of the embodiment of the invention is realized by means of the low-temperature desulfurization and denitrification system for the flue gas of the sintering machine 1 in the steel mill of the embodiment.
The low-temperature desulfurization and denitrification method for the flue gas of the sintering machine 1 in the steel mill comprises the following steps of:
dedusting the flue gas;
reducing the temperature of the flue gas to below 20 ℃;
introducing the flue gas into an adsorption tower 3 for desulfurization and denitration;
and discharging the flue gas.
Specifically, the flue gas is dedusted by the deduster 8, the temperature of the flue gas is reduced to below 20 ℃ by the cooling system 2, and then the flue gas adsorption tower 3 is desulfurized and denitrated, and finally the flue gas is discharged.
Preferably, the cooling system 2 reduces the temperature of the flue gas to-5 ℃ to 5 ℃, i.e. the temperature of the flue gas is greater than or equal to-5 ℃ and less than or equal to 5 ℃.
According to the low-temperature desulfurization and denitration method for the flue gas of the sintering machine 1 in the steel mill, the temperature of the flue gas is reduced to be lower than 20 ℃, and then the flue gas is adsorbed by the adsorption tower 3, so that the flue gas is desulfurized and denitrated.
Therefore, the low-temperature desulfurization and denitrification method for the flue gas of the sintering machine 1 in the steel mill according to the embodiment of the invention does not need to heat the flue gas, and the denitrification efficiency is high.
In some embodiments, after the flue gas is introduced into the adsorption tower 3 for desulfurization and denitration,
discharging the adsorbent in the adsorption tower 3;
the discharged adsorbent is sent to a regeneration tower 4 to prepare acid gas.
Specifically, the adsorbent in the adsorption tower 3 is discharged and the discharged adsorbent is transported to the regeneration tower 4, and the adsorbent is heated by the regeneration tower 4, so that the adsorbent releases the adsorbed acid gas, thereby being used for producing the acid gas.
Therefore, the low-temperature desulfurization and denitrification method for the flue gas of the sintering machine 1 in the steel mill according to the embodiment of the invention prepares the acid gas by using the adsorbent, so that the adsorbent can be recycled.
In some embodiments, after the discharged adsorbent is sent to the regeneration tower 4 to make acid gas,
discharging the adsorbent in the regeneration tower 4;
cooling the discharged adsorbent;
the adsorbent is fed to the adsorption column 3.
Specifically, the adsorbent in regeneration tower 4 is discharged, the discharged adsorbent is cold-fed into precooler 5, cooling gas is fed into precooler 5, the cooling gas can cool precooler 5 to cool the adsorbent in precooler 5, and then the adsorbent is fed into adsorption tower 3. Therefore, the adsorbent can be recycled.
It is understood that after the flue gas is introduced into the adsorption tower 3 for desulfurization and denitration, the flue gas is introduced into the precooler 5 before being discharged, so that the flue gas forms a cooling gas. Therefore, the cold energy of the flue gas can be fully utilized, and the precooler 5 is cooled without extra refrigeration.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A low-temperature desulfurization and denitrification method for flue gas of a sintering machine in a steel mill is characterized by comprising the following steps of:
dedusting the flue gas;
reducing the temperature of the flue gas to below 20 ℃;
introducing the flue gas into an adsorption tower for desulfurization and denitrification;
and discharging the flue gas.
2. The low-temperature desulfurization and denitration method for steel mill sintering machine flue gas according to claim 1, characterized in that after the flue gas is introduced into an adsorption tower for desulfurization and denitration,
discharging the adsorbent in the adsorption column;
and sending the discharged adsorbent to a regeneration tower to prepare acid gas.
3. The method for low-temperature desulfurization and denitration of flue gas of sintering machine of steel mill according to claim 2, characterized in that after said discharged adsorbent is sent to a regeneration tower to produce acid gas,
discharging the adsorbent in the regeneration column;
cooling the discharged adsorbent;
feeding the adsorbent to the adsorption column.
4. The method according to claim 3, wherein the cooling the discharged adsorbent comprises:
cold feeding the discharged adsorbent into a precooler;
introducing cooling gas into the precooler to cool the precooler.
5. The method according to claim 4, wherein the flue gas is introduced into the precooler after the flue gas is introduced into the adsorption tower for desulfurization and denitration and before the flue gas is discharged, and the flue gas forms the cooling gas.
6. The utility model provides a low temperature SOx/NOx control system for steel mill sintering machine flue gas which characterized in that includes:
a sintering machine including a flue gas discharge port;
the cooling system comprises a first flue gas inlet and a first flue gas outlet, and the flue gas discharge port is communicated with the first flue gas inlet so as to introduce the flue gas into the cooling system, thereby reducing the temperature of the flue gas to below 20 ℃;
the adsorption tower comprises a first feed port, a first discharge port, a second flue gas inlet and a second flue gas outlet, the first flue gas outlet is communicated with the second flue gas inlet so as to introduce the flue gas into the adsorption tower to desulfurize and denitrate the flue gas, the first feed port is used for adding an adsorbent into the adsorption tower, and the first discharge port is used for discharging the adsorbent in the adsorption tower;
the regeneration tower, the regeneration tower includes sour gas export, second feed inlet and second discharge gate, the second feed inlet be used for to add in the regeneration tower first discharge gate exhaust adsorbent, the second discharge gate is used for discharging adsorbent in the regeneration tower, the regeneration tower still includes the heating tube, the heating tube can let in high temperature steam, so that the heating adsorbent in the regeneration tower, thereby make adsorbent in the regeneration tower releases sour gas, the sour gas export is used for discharging sour gas.
7. The low-temperature desulfurization and denitrification system for the flue gas of the sintering machine of the steel mill according to claim 6, further comprising a precooler, wherein the precooler comprises a third feeding port and a third discharging port, the third feeding port is used for feeding the adsorbent discharged from the second discharging port into the precooler, the third discharging port is used for discharging the adsorbent in the precooler, and the precooler further comprises a cooling pipeline which is used for introducing cooling gas so as to cool the adsorbent in the precooler.
8. The low-temperature desulfurization and denitrification system for flue gas of sintering machines in steel mills according to claim 7, wherein the cooling pipeline comprises a third flue gas inlet and a third flue gas outlet, and the third flue gas inlet is communicated with the second flue gas outlet, so that flue gas in the adsorption tower is introduced into the cooling pipeline, and the flue gas forms the cooling gas.
9. The low-temperature desulfurization and denitrification system for flue gas of sintering machines of steel mills according to any one of claims 6 to 8, further comprising a first conveying device for conveying the adsorbent discharged from the first discharge port to the second feed port of the regeneration tower so as to add the adsorbent discharged from the first discharge port into the regeneration tower.
10. The low-temperature desulfurization and denitrification system for flue gas of a sintering machine of a steel mill according to claim 7 or 8, further comprising a second conveying device and a third conveying device, wherein the second conveying device is used for conveying the adsorbent discharged from the second discharge hole to the third feed hole of the precooler so as to add the adsorbent discharged from the second discharge hole into the precooler,
the third conveying device is used for conveying the adsorbent discharged from the third discharge port to the first feed port of the adsorption tower so as to add the adsorbent discharged from the third discharge port into the adsorption tower.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111143263.4A CN113834340A (en) | 2021-09-28 | 2021-09-28 | Low-temperature desulfurization and denitrification method and system for flue gas of sintering machine of steel mill |
| PCT/CN2021/139792 WO2023050602A1 (en) | 2021-09-28 | 2021-12-20 | Low temperature desulfurization and denitrification method and system for flue gas in steel plant sintering machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111143263.4A CN113834340A (en) | 2021-09-28 | 2021-09-28 | Low-temperature desulfurization and denitrification method and system for flue gas of sintering machine of steel mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113834340A true CN113834340A (en) | 2021-12-24 |
Family
ID=78967026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111143263.4A Pending CN113834340A (en) | 2021-09-28 | 2021-09-28 | Low-temperature desulfurization and denitrification method and system for flue gas of sintering machine of steel mill |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN113834340A (en) |
| WO (1) | WO2023050602A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023050702A1 (en) * | 2021-09-28 | 2023-04-06 | 中国华能集团清洁能源技术研究院有限公司 | Low-temperature desulfurization and denitrification method and system for flue gas from rotary kiln combustion furnace of refuse incineration power plant |
| WO2023050701A1 (en) * | 2021-09-28 | 2023-04-06 | 中国华能集团清洁能源技术研究院有限公司 | Low-temperature desulfurization and denitrification method and system for flue gas from coking plant |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116351207B (en) * | 2023-06-01 | 2023-08-29 | 中国华能集团清洁能源技术研究院有限公司 | Low-temperature flue gas adsorption tower with flue gas cooling function and adsorption method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011105985A (en) * | 2009-11-16 | 2011-06-02 | Kobe Steel Ltd | Method for treating exhaust gas in sintering machine |
| CN105688566A (en) * | 2016-03-02 | 2016-06-22 | 钢研晟华工程技术有限公司 | Desulfurization and denitrification device and method for sintering flue gas |
| JP2017177046A (en) * | 2016-03-31 | 2017-10-05 | 三菱重工業株式会社 | Exhaust gas treatment method and system |
| CN107983154A (en) * | 2017-11-28 | 2018-05-04 | 中南大学 | One kind sintering parallel double tower desulfurizing and denitrifying process of flue gas activated carbon |
| CN111495112A (en) * | 2020-05-18 | 2020-08-07 | 中国华能集团有限公司 | Low temperature removes integration of bed and adsorbs SOx/NOx control system |
| CN111589303A (en) * | 2020-06-03 | 2020-08-28 | 中冶华天工程技术有限公司 | Sintering flue gas combined desulfurization and denitrification system |
| CN111841066A (en) * | 2020-08-14 | 2020-10-30 | 中国华能集团清洁能源技术研究院有限公司 | System and method for removing acid gas in flue gas |
-
2021
- 2021-09-28 CN CN202111143263.4A patent/CN113834340A/en active Pending
- 2021-12-20 WO PCT/CN2021/139792 patent/WO2023050602A1/en unknown
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011105985A (en) * | 2009-11-16 | 2011-06-02 | Kobe Steel Ltd | Method for treating exhaust gas in sintering machine |
| CN105688566A (en) * | 2016-03-02 | 2016-06-22 | 钢研晟华工程技术有限公司 | Desulfurization and denitrification device and method for sintering flue gas |
| JP2017177046A (en) * | 2016-03-31 | 2017-10-05 | 三菱重工業株式会社 | Exhaust gas treatment method and system |
| CN107983154A (en) * | 2017-11-28 | 2018-05-04 | 中南大学 | One kind sintering parallel double tower desulfurizing and denitrifying process of flue gas activated carbon |
| CN111495112A (en) * | 2020-05-18 | 2020-08-07 | 中国华能集团有限公司 | Low temperature removes integration of bed and adsorbs SOx/NOx control system |
| CN111589303A (en) * | 2020-06-03 | 2020-08-28 | 中冶华天工程技术有限公司 | Sintering flue gas combined desulfurization and denitrification system |
| CN111841066A (en) * | 2020-08-14 | 2020-10-30 | 中国华能集团清洁能源技术研究院有限公司 | System and method for removing acid gas in flue gas |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023050702A1 (en) * | 2021-09-28 | 2023-04-06 | 中国华能集团清洁能源技术研究院有限公司 | Low-temperature desulfurization and denitrification method and system for flue gas from rotary kiln combustion furnace of refuse incineration power plant |
| WO2023050701A1 (en) * | 2021-09-28 | 2023-04-06 | 中国华能集团清洁能源技术研究院有限公司 | Low-temperature desulfurization and denitrification method and system for flue gas from coking plant |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023050602A1 (en) | 2023-04-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113834340A (en) | Low-temperature desulfurization and denitrification method and system for flue gas of sintering machine of steel mill | |
| CN215876789U (en) | Low-temperature desulfurization and denitrification system for flue gas of cement plant | |
| CN109794146B (en) | Grate-rotary kiln SNCR/SCR denitration and active coke desulfurization combined system and process | |
| WO2018000888A1 (en) | Flue gas desulfurization and denitrification method and device capable of preventing corrosion | |
| CN105698550B (en) | The sintering smoke purifying system and method for a kind of energy-saving and emission-reduction | |
| CN105618019B (en) | Activated carbon Thermal desorption method and its device including UTILIZATION OF VESIDUAL HEAT IN | |
| CN113834341A (en) | Low-temperature desulfurization and denitrification method and system for cement plant flue gas | |
| CN108380041A (en) | A kind of coke oven flue gas system for desulfuration and denitration and method based on activated carbon/coke | |
| CN105688873B (en) | Activated carbon Thermal desorption method and its device | |
| CN108176221B (en) | Sintering flue gas temperature rising denitration device and sintering flue gas temperature rising denitration method | |
| CN107551757A (en) | A kind of flue gas desulfurization and denitration method and device | |
| CN108310968A (en) | NO in a kind of realization ultralow temperature flue gasxThe method and process system of efficient removal and its recycling | |
| CN107115775B (en) | Iron ore sintering flue gas sectional enrichment self-heat exchange emission reduction SOxAnd NOxMethod of producing a composite material | |
| CN106996702A (en) | A kind of agglomeration for iron mine flue gas segmentation enrichment and UTILIZATION OF VESIDUAL HEAT IN emission reduction SOxAnd NOxMethod | |
| CN213132673U (en) | Grate-rotary kiln pelletizing flue gas classification denitrification facility | |
| CN209333456U (en) | A kind of activated carbon method flue gases purification and low-temperature denitration assembled smoke gas processing system | |
| CN216171166U (en) | Low-temperature desulfurization and denitrification system for flue gas of sintering machine of steel mill | |
| CN205448732U (en) | Energy saving and emission reduction's sintering gas cleaning system | |
| CN110496527A (en) | A kind of method of coke oven flue exhuast gas desulfurization denitration | |
| CN209828672U (en) | Grate-rotary kiln SNCR/SCR denitration and active coke desulfurization combined system | |
| CN208177248U (en) | It is a kind of based on active carbon/coke coke oven flue gas system for desulfuration and denitration | |
| CN209310573U (en) | A kind of purification of Analytic Tower heat supply hot-air system discharged gas fume and waste-heat recovery device | |
| CN105056918B (en) | Energy saving and environment friendly active coke regeneration system and method | |
| CN204503101U (en) | Active carbon thermal analysis apparatus | |
| CN211659714U (en) | Combined flue gas circulation, grading purification and waste heat utilization device for multiple sintering machines |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211224 |