CN112275129A - Flue gas emission treatment method and equipment - Google Patents
Flue gas emission treatment method and equipment Download PDFInfo
- Publication number
- CN112275129A CN112275129A CN202010918843.5A CN202010918843A CN112275129A CN 112275129 A CN112275129 A CN 112275129A CN 202010918843 A CN202010918843 A CN 202010918843A CN 112275129 A CN112275129 A CN 112275129A
- Authority
- CN
- China
- Prior art keywords
- activated carbon
- flue gas
- treatment system
- flue
- absorption tower
- 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
- 239000003546 flue gas Substances 0.000 title claims abstract description 106
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 105
- 238000011282 treatment Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 60
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 211
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 38
- 230000008569 process Effects 0.000 claims abstract description 32
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000011221 initial treatment Methods 0.000 claims abstract description 24
- 239000000428 dust Substances 0.000 claims abstract description 16
- 238000001179 sorption measurement Methods 0.000 claims abstract description 13
- 238000010521 absorption reaction Methods 0.000 claims description 45
- 238000003795 desorption Methods 0.000 claims description 31
- 239000007789 gas Substances 0.000 claims description 28
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 27
- 239000003054 catalyst Substances 0.000 claims description 24
- 239000002699 waste material Substances 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 19
- 229910021529 ammonia Inorganic materials 0.000 claims description 11
- 229910052799 carbon Inorganic materials 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 238000012546 transfer Methods 0.000 claims description 9
- 238000011144 upstream manufacturing Methods 0.000 claims description 8
- 239000006096 absorbing agent Substances 0.000 claims description 7
- 239000000446 fuel Substances 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 239000000779 smoke Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000005192 partition Methods 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims description 3
- 239000003517 fume Substances 0.000 claims 3
- 239000003344 environmental pollutant Substances 0.000 abstract description 4
- 231100000719 pollutant Toxicity 0.000 abstract description 4
- 238000005245 sintering Methods 0.000 description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 235000010269 sulphur dioxide Nutrition 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000002912 waste gas Substances 0.000 description 4
- 238000010531 catalytic reduction reaction Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000007809 chemical reaction catalyst Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000004291 sulphur dioxide Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
-
- 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
- B01D53/005—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 heat treatment
-
- 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
- B01D53/06—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 moving adsorbents, e.g. rotating beds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/302—Sulfur oxides
-
- 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
Abstract
The invention discloses a flue gas emission treatment method, wherein the flue gas emission treatment method comprises the following steps of utilizing a two-stage treatment system to carry out flue gas emission and treatment so as to remove sulfur dioxide, nitrogen oxide and dust in flue gas, wherein the flue gas emission and treatment by utilizing the two-stage treatment system comprises the following steps: the primary treatment system primarily purifies the flue gas by using an activated carbon adsorption process, wherein the flue gas transversely passes through an activated carbon layer, and the activated carbon layer vertically moves downwards; the secondary treatment system utilizes a low-temperature SCR denitration process to secondarily purify flue gas. The invention also provides a flue gas emission treatment device. The invention can carry out ultralow emission and treatment of the flue gas through the two-stage treatment system, and can effectively remove pollutants such as sulfur dioxide, nitrogen oxide, dust and the like in the flue gas.
Description
Technical Field
The invention relates to the technical field of waste gas treatment, in particular to a flue gas emission treatment method and flue gas emission treatment equipment.
Background
In general, sintering production is one of the most important process units in modern steel production and is also one of the major sources of pollution for the steel industry. Conventionally, in the sintering production, concentrate powder, various iron-containing wastes, dedusting ash, steel rolling iron scale and other iron-containing materials which cannot be directly smelted in a blast furnace are used as main raw materials, fuel (coke powder or anthracite) and flux (limestone and lime powder) with proper proportion are added, and the processes of raw material processing, preparation, mixing, pelletizing, material distribution, ignition, sintering, crushing, screening, cooling and the like are carried out to produce finished sintered ore, wherein qualified sintered ore is cooled and then sent to a blast furnace bin to be used as an iron-making raw material, and sintered ore powder with unqualified particle size is returned to a sintering ingredient for re-sintering. During the production process, the waste gas pollutants are mainly smoke (dust) dust and SO2And CO, wherein the dust is mainly obtained by crushing, proportioning and mixing raw materials. Including SO produced during sintering of the sinter2And a large amount of waste gas such as CO and smoke dust is discharged through a high chimney after the waste gas is subjected to electric precipitation. The NOx emission in the sintering process accounts for about 50 percent of the total NOx emission in the iron and steel industry, and SO2The discharge amount accounts for about 60% of the total discharge amount of the steel industry.
With the increasing attention on environmental protection, China puts forward more strict requirements on the emission of sintering flue gas dust, sulfur dioxide, nitrogen oxides and the like. For example, according to the Chinese ring atmosphere [2019]The article No. 35 specifies: sinteringUnder the condition that the reference oxygen content of the head flue gas and the pellet roasting flue gas is 16 percent, the hourly mean emission concentrations of particulate matters, sulfur dioxide and nitrogen oxides are respectively not higher than 10, 35 and 50mg/m3。
However, most sintering plants traditionally only adopt dry method, semi-dry method, wet desulphurization and bag-type dust removal, and pollutants can not meet the requirement of ultralow emission.
Therefore, there is a need in the art for a method and an apparatus for treating smoke emissions that eliminates or at least alleviates all or part of the above-mentioned drawbacks of the prior art.
Disclosure of Invention
In view of the above technical problems in the prior art, an object of the present invention is to provide a flue gas emission treatment method, which can use an activated carbon adsorption process as a primary treatment system, use low-temperature SCR denitration as a secondary treatment system, and perform emission and treatment by using the two-stage treatment system, so as to effectively remove sulfur dioxide, nitrogen oxide, dust and other wastes in the flue gas. The invention also provides a flue gas emission treatment device. In particular, the invention is applicable to the emission treatment of sintering flue gas.
It is emphasized that, unless otherwise indicated, the terms used herein correspond to the ordinary meanings of the various technical and scientific terms in the art, and the meanings of the technical terms defined in the various technical dictionaries, textbooks, etc.
Because most sintering plants only adopt a dry method, a semi-dry method, wet desulphurization and bag dust removal at present, pollutants can not meet the requirement of China on ultralow emission of the environment, and the invention is developed. The invention further processes the sintering flue gas to meet the requirement of China ring atmosphere [2019]]The requirement of No. 35 document is that the hourly mean emission concentrations of particulate matters, sulfur dioxide and nitrogen oxides are respectively not higher than 10, 35 and 50mg/m3The standard of (2).
To this end, according to an embodiment of the present invention, there is provided a method for treating flue gas emission, wherein the method for treating flue gas emission includes using a two-stage treatment system to perform flue gas emission and treatment to remove sulfur dioxide, nitrogen oxides and dust in flue gas, and wherein the using the two-stage treatment system to perform flue gas emission and treatment includes:
the primary treatment system primarily purifies the flue gas by using an activated carbon adsorption process, wherein the flue gas transversely passes through an activated carbon layer, and the activated carbon layer vertically moves downwards;
the secondary treatment system utilizes a low-temperature SCR denitration process to secondarily purify flue gas. SCR (selective Catalytic reduction) is a selective Catalytic reduction technique.
Further, in one embodiment, the primary processing system may include: the device comprises an inlet flue, an absorption tower, an outlet flue, a desorption tower, a first activated carbon conveying chain and a second activated carbon conveying chain;
wherein, the flue gas can enter the absorption tower through the inlet flue, and can be discharged through the outlet flue and input into the secondary treatment system;
the active carbon can circularly move among the absorption tower, the first active carbon conveying chain, the desorption tower and the second active carbon conveying chain so as to be recycled.
Further, in one embodiment, the step of passing the flue gas transversely through the activated carbon layer may comprise: after entering the absorption tower, the flue gas transversely passes through an activated carbon bed consisting of three activated carbon moving layers.
Further, in an embodiment, the step of moving the activated carbon layer vertically downward may include: controlling the discharge amount of the waste-adsorbed activated carbon of the absorption tower during the vertical downward movement of the activated carbon layer.
Further, in an embodiment, the step of the primary treatment system for primarily purifying the flue gas by using an activated carbon adsorption process may further include:
in the desorption tower, the active carbon adsorbed with the wastes runs from top to bottom and firstly passes through a heating section to be heated to more than 300 ℃ so that the wastes adsorbed by the active carbon are desorbed; the desorbed activated carbon is then cooled in a cooling section to below 100 ℃.
Further, in one embodiment, the secondary processing system may include: the denitration reactor comprises a denitration reactor, an ammonia spraying grid positioned at the upstream of the denitration reactor according to the flowing direction of flue gas, an auxiliary heating furnace positioned at the upstream of the ammonia spraying grid, and a denitration flue used for discharging the denitrated gas out of the denitration reactor, wherein a low-temperature SCR denitration catalyst is arranged in the denitration reactor.
Further, in an embodiment, the secondary treatment system for secondarily purifying the flue gas by using the low-temperature SCR denitration process may include:
firstly, heating the primarily purified flue gas input from a primary treatment system, and raising the temperature to 150-180 ℃;
next, the heated flue gas can be mixed with ammonia gas, and the obtained mixed gas can be input into a denitration reactor;
next, in the denitration reactor, nitrogen oxides in the mixed gas may be removed by means of a low-temperature SCR denitration catalyst.
Further, in an embodiment, the reaction temperature of the low-temperature SCR denitration catalyst may be in a range of 150 to 180 ℃.
Further, in one embodiment, the holding furnace may use blast furnace gas or converter gas as fuel.
In another aspect, according to another embodiment of the present invention, there is provided a flue gas emission treatment device, wherein the flue gas emission treatment device includes two stages of treatment systems connected to each other, and the two stages of treatment systems include:
the primary treatment system is used for primarily purifying the flue gas by utilizing an activated carbon adsorption process;
and the secondary treatment system is used for secondarily purifying the flue gas by utilizing a low-temperature SCR denitration process.
Further, in one embodiment, the primary processing system may include:
an inlet flue operable to input flue gas;
an absorption tower connectable to the inlet flue to receive the flue gas from the inlet flue and adsorb waste in the flue gas using activated carbon to obtain a primarily purified flue gas and to discharge the activated carbon having adsorbed the waste;
an outlet flue connected to the absorption tower to discharge the primarily cleaned flue gas;
a desorption tower for desorbing the waste-adsorbed activated carbon from the absorption tower to return the desorbed activated carbon to the absorption tower;
a first activated carbon transfer chain having one end connected to a lower portion of the absorption tower and the other end connected to an upper portion of the desorption tower, for transferring the activated carbon adsorbed with the wastes from the absorption tower to the desorption tower;
a second activated carbon transfer chain, one end of which is connected to the upper part of the absorption tower and the other end of which is connected to the lower part of the desorption tower, for transferring the desorbed activated carbon from the desorption tower back to the absorption tower;
wherein the absorption tower, the first activated carbon conveying chain, the desorption tower and the second activated carbon conveying chain form an activated carbon recirculation loop together.
Further, in an embodiment, the absorption tower may comprise two axisymmetrically arranged first and second panels, wherein each of the first and second panels may have a plurality of absorber modules disposed therein, each of the absorber modules may comprise an activated carbon bed, wherein,
the activated carbon bed may include three moving layers of activated carbon separated by an inlet grill, an outlet grill and a partition plate, and a roller discharger for controlling a discharge amount of the activated carbon adsorbed with the wastes.
Preferably, both the inlet and outlet grates are designed to prevent activated carbon from falling out of the absorber and becoming packed with dust from the absorber.
Further, in an embodiment, the desorption tower may include a heater for heating the activated carbon having adsorbed the wastes to 300 ℃ or more so that the wastes adsorbed by the activated carbon are desorbed, and a cooler for cooling the desorbed activated carbon to 100 ℃ or less directly below the heater.
Further, in one embodiment, both the heater and the cooler may employ a multi-tube heat exchanger.
Further, in one embodiment, the secondary processing system may include:
the denitration reactor can be connected with an outlet flue of the primary treatment system and is used for carrying out denitration reaction on the primarily purified flue gas input from the primary treatment system;
the ammonia injection grid can be positioned at the upstream of the denitration reactor according to the flowing direction of the flue gas and is used for providing ammonia gas;
the concurrent heating furnace can be positioned at the upstream of the ammonia spraying grid according to the flowing direction of the flue gas and is used for heating the primarily purified flue gas input from the primary treatment system;
a denitration flue connectable to a lower portion of the denitration reactor, for discharging the denitrated gas out of the denitration reactor;
wherein, a low-temperature SCR denitration catalyst can be arranged in the denitration reactor.
Preferably, the low-temperature SCR denitration catalyst may take the form of a honeycomb catalyst layer.
Preferably, the denitration reactor may employ a vertically disposed catalyst reaction tower.
Preferably, the reaction temperature range of the low-temperature SCR denitration catalyst is 150-180 ℃.
Preferably, the holding furnace uses blast furnace gas or converter gas as fuel.
The flue gas emission treatment method and the equipment provided by the embodiment of the invention have the following beneficial effects:
according to the invention, through a two-stage treatment system, an activated carbon adsorption process is adopted as a primary treatment system, and low-temperature SCR denitration is adopted as a secondary treatment system, so that sulfur dioxide, nitric oxide, dust and other wastes in flue gas can be effectively removed.
In particular, the invention is applicable to the emission treatment of sintering flue gas.
Furthermore, the sintering gas treated by the method can meet the discharge requirement of the file No. 35 of the Chinese ring atmosphere [2019] related to sintering production, and has excellent economic benefit and environmental protection benefit.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 schematically illustrates a block diagram of a flue gas emission treatment apparatus according to an embodiment of the invention;
FIG. 2 schematically shows a schematic structural view of the absorption column in FIG. 1;
fig. 3 schematically shows a schematic view of the structure of the desorption column in fig. 1.
Description of the element reference numerals
10: flue gas emission treatment equipment; 100: an absorption tower; 101: a front bed; 102: a middle bed; 103: a back bed; 104: a first panel; 105: a second panel; 106: an inlet grille; 107: a separator plate; 108: an outlet grill; 109: a roll discharger; 110: an inlet smoke hood; 200: a desorption tower; 201: a heater; 202: a cooler; 300: a first activated carbon conveyor chain; 400: a second activated carbon conveyor chain; 500: an inlet flue; 600: an outlet flue; 700: an SCR denitration reactor; 701: a catalyst; 702: an ammonia injection grid; 703: a heat supplementing furnace; 704: denitration flue.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme provided by the embodiment of the invention is described in detail below with reference to the accompanying drawings.
The invention can design a two-stage treatment system for emission treatment of flue gas, namely, an activated carbon adsorption process is adopted as a primary treatment system, and low-temperature SCR denitration is adopted as a secondary treatment system.
FIG. 1 schematically illustrates a block diagram of a flue gas emission treatment apparatus 10 according to an embodiment of the present invention; FIG. 2 schematically shows a schematic view of the absorption column 100 in FIG. 1; fig. 3 schematically shows a schematic view of the structure of the desorption tower 200 in fig. 1.
The primary treatment system can utilize an activated carbon adsorption process to primarily purify flue gas, and the main process can comprise the following steps: the flue gas transversely passes through the activated carbon layer, and the activated carbon layer vertically moves downwards.
Referring to fig. 1, the main devices of the primary processing system may include: the absorption tower 100, the desorption tower 200, the first activated carbon conveying chain 300, the second activated carbon conveying chain 400, the inlet flue 500, the outlet flue 600 and the like.
Referring to fig. 2, the absorption tower 100 may be composed of two first panels 104 and second panels 105 arranged axisymmetrically. Exhaust gas may be distributed into each absorber module through the inlet hood 110 and may then be purified through the activated carbon bed first panel 104 and second panel 105. The activated carbon bed can be divided into three active carbon moving layers, namely a front bed 101, a middle bed 102 and a rear bed 103 which are divided along the flowing direction of flue gas, by an inlet grid 106 and an outlet grid 108 which are arranged in parallel and spaced apart from each other along the vertical direction and a partition plate 107, so that efficient desulfurization and denitrification are facilitated. The front bed 101, the middle bed 102 and the rear bed 103 may each be provided with a roll discharger 109 to control the amount of activated carbon discharged. Both the inlet grill 106 and the outlet grill 108 may be designed to prevent activated carbon within the absorption tower 100 from scattering and being clogged with various dusts such as carbon powder.
The desorption tower 200 may be mainly composed of a heater 201 and a cooler 202. Both the heater 201 and the cooler 202 may be multi-tube heat exchangers. The waste-adsorbed activated carbon, for example, sulfide-adsorbed activated carbon, may be transferred to the desorption tower 200 through the first activated carbon transfer chain 300, and the activated carbon may be operated from the top to the bottom in the desorption tower 200, and first heated to 300 ℃ or higher by the heater 201, and the substances adsorbed by the activated carbon may be desorbed, and then the desorbed activated carbon may be cooled to 100 ℃ or lower by the cooler 202, and then may be returned to the absorption tower 100 again through the second activated carbon transfer chain 400, and thus may be repeatedly recycled. The desorbed sulphur dioxide rich gas may be discharged to other after-treatment facilities via an outlet flue 600.
From the above, it can be seen thatThe recycling of the charcoal is performed by the first activated charcoal conveying chain 300 and the second activated charcoal conveying chain 400, so that the activated charcoal can be recycled between the absorption tower 100 and the desorption tower 200. As shown in fig. 1, a first activated carbon transfer chain 300 may be connected at one end to a lower portion of the absorption tower 100 and at the other end to the desorption tower 200 to adsorb SO in the flue gas2The activated carbon of the wastes is transferred to the desorption tower 200. The second activated carbon transfer chain 400 may have one end connected to the lower portion of the desorption tower 200 and the other end connected to the upper portion of the absorption tower 100 to transfer the desorbed clean activated carbon into the absorption tower 100 for reuse.
The low-temperature SCR denitration process is used for secondary purification of flue gas, and comprises the following main processes: heating the flue gas by using a gas heating furnace, and heating to 150-180 ℃; after the flue gas and the ammonia gas are mixed, the mixed gas enters a denitration reactor, and nitrogen oxides NOx in the flue gas are removed under the catalytic action of a low-temperature SCR denitration catalyst.
The low temperature SCR denitration main device includes: the system comprises an SCR denitration reactor 700, a low-temperature catalyst 701, an ammonia injection grid 702, an auxiliary heating furnace 703, a denitration flue 704 and the like.
The SCR denitration reactor 9 may be a vertically disposed catalyst reaction tower. Flue gas and reducing agent ammonia (NH) passing through primary treatment system3) After mixing, the NOx in the flue gas can be reduced and decomposed into harmless nitrogen and water through a honeycomb catalyst layer in the SCR denitration reactor 9 under the action of a catalyst.
The catalyst 701 is a low-temperature catalyst, and the reaction temperature range is 0-200 ℃, preferably 150-180 ℃.
The heat-supplementing furnace 703 can adopt blast furnace gas or converter gas as a heat source, and the heated high-temperature flue gas can adopt a direct air-mixing heat-supplementing mode to heat the flue gas. The flue gas concurrent heating system can raise the sintering flue gas temperature by 5-80 ℃ so as to meet the reaction temperature requirement of a low-temperature Selective Catalytic Reduction (SCR) reaction catalyst and realize the stable and reliable operation of the denitration device.
The following illustrates specific embodiments according to an embodiment of the present invention, but the present application is not limited to the following embodiments.
Example 1
The flue gas emission treatment method for sintering flue gas and the equipment thereof are specifically implemented as follows:
firstly, an activated carbon adsorption process can be adopted as a primary treatment system;
secondly, a low-temperature SCR denitration process can be adopted as a secondary treatment system;
thirdly, the absorption tower 100 which is originally designed can be adopted;
the low-temperature catalytic reaction temperature can be 160-200 ℃, and the concurrent heating furnace 703 can adopt blast furnace gas as fuel;
example 2
The flue gas emission treatment method for sintering flue gas and the equipment thereof are specifically implemented as follows:
firstly, an activated carbon adsorption process can be adopted as a primary treatment system;
secondly, a low-temperature SCR denitration process can be adopted as a secondary treatment system;
thirdly, the absorption tower 100 which is originally designed can be adopted;
the low-temperature catalytic reaction temperature can be 130-180 ℃, and the concurrent heating furnace 703 can adopt converter gas as fuel.
The test shows that the sintering gas treated by the method can meet the discharge requirement of the file No. 35 of the Chinese ring atmosphere [2019] related to sintering production.
In conclusion, the invention can effectively remove sulfur dioxide, nitrogen oxide, dust and other wastes in the flue gas through the two-stage treatment system, thereby realizing the ultra-low emission treatment of the flue gas. In particular, the invention is applicable to the emission treatment of sintering flue gas. The sintering gas treated by the method can meet relevant regulations of China on environmental protection related to sintering production, and has excellent economic benefit and environmental protection benefit.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The flue gas emission treatment method is characterized by comprising the following steps of carrying out flue gas emission and treatment by using a two-stage treatment system so as to remove sulfur dioxide, nitrogen oxide and dust in flue gas, wherein the flue gas emission and treatment by using the two-stage treatment system comprises the following steps:
the primary treatment system primarily purifies the flue gas by using an activated carbon adsorption process, wherein the flue gas transversely passes through an activated carbon layer, and the activated carbon layer vertically moves downwards;
the secondary treatment system utilizes a low-temperature SCR denitration process to secondarily purify flue gas.
2. The method of claim 1, wherein the primary treatment system comprises: the device comprises an inlet flue, an absorption tower, an outlet flue, a desorption tower, a first activated carbon conveying chain and a second activated carbon conveying chain;
wherein, the flue gas enters the absorption tower through the inlet flue, is discharged through the outlet flue and is input into the secondary treatment system;
wherein the active carbon circularly moves among the absorption tower, the first active carbon conveying chain, the desorption tower and the second active carbon conveying chain so as to be recycled.
3. The method of treating exhaust gas emissions according to claim 2,
the step of enabling the smoke to transversely pass through the activated carbon layer comprises the following steps: after entering the absorption tower, the flue gas transversely passes through an activated carbon bed consisting of three activated carbon moving layers;
preferably, the step of moving the activated carbon layer vertically downward includes: controlling the discharge amount of the waste-adsorbed activated carbon of the absorption tower during the vertical downward movement of the activated carbon layer.
4. The flue gas emission treatment method of claim 3, wherein the primary treatment system primary purification step using activated carbon adsorption process further comprises:
in the desorption tower, the active carbon adsorbed with the wastes runs from top to bottom and firstly passes through a heating section to be heated to more than 300 ℃ so that the wastes adsorbed by the active carbon are desorbed; the desorbed activated carbon is then cooled in a cooling section to below 100 ℃.
5. The double-deck sealed material guide device of claim 2, wherein the secondary treatment system comprises: the denitration reactor comprises a denitration reactor, an ammonia spraying grid positioned at the upstream of the denitration reactor according to the flowing direction of flue gas, an auxiliary heating furnace positioned at the upstream of the ammonia spraying grid, and a denitration flue used for discharging the denitrated gas out of the denitration reactor, wherein a low-temperature SCR denitration catalyst is arranged in the denitration reactor.
6. The double-layer sealed material guide device of claim 5, wherein the secondary treatment system for secondary flue gas purification by using a low-temperature SCR denitration process comprises:
firstly, heating primary purified flue gas input from a primary treatment system, and raising the temperature to 150-180 ℃;
next, mixing the heated flue gas with ammonia gas, and inputting the obtained mixed gas into a denitration reactor;
next, removing nitrogen oxides in the mixed gas by means of a low-temperature SCR denitration catalyst in a denitration reactor;
preferably, the reaction temperature range of the low-temperature SCR denitration catalyst is 150-180 ℃;
preferably, the holding furnace uses blast furnace gas or converter gas as fuel.
7. A flue gas emission treatment plant, comprising two stages of treatment systems connected to each other, the two stages of treatment systems comprising:
the primary treatment system is used for primarily purifying the flue gas by utilizing an activated carbon adsorption process;
and the secondary treatment system is used for secondarily purifying the flue gas by utilizing a low-temperature SCR denitration process.
8. The fume emission treatment device according to claim 7, wherein the primary treatment system comprises:
an inlet flue for inputting flue gas;
an absorption tower connected to the inlet flue to receive the flue gas from the inlet flue and adsorb waste in the flue gas using activated carbon to obtain primarily purified flue gas and discharge the activated carbon adsorbed with the waste;
an outlet flue connected to the absorption tower to discharge the primarily cleaned flue gas;
a desorption tower for desorbing the waste-adsorbed activated carbon from the absorption tower to return the desorbed activated carbon to the absorption tower;
a first activated carbon transfer chain having one end connected to a lower portion of the absorption tower and the other end connected to an upper portion of the desorption tower, for transferring the activated carbon adsorbed with the wastes from the absorption tower to the desorption tower;
a second activated carbon transfer chain, one end of which is connected to the upper part of the absorption tower and the other end of which is connected to the lower part of the desorption tower, for transferring the desorbed activated carbon from the desorption tower back to the absorption tower;
wherein the absorption tower, the first activated carbon conveying chain, the desorption tower and the second activated carbon conveying chain form an activated carbon recirculation loop together.
9. The fume emission treatment device according to claim 8, wherein the absorption tower comprises two axisymmetrically arranged first and second panels, wherein a plurality of absorber modules are arranged in each of the first and second panels, each absorber module comprising a bed of activated carbon, wherein,
the activated carbon bed comprises three moving layers of activated carbon separated by an inlet grill, an outlet grill and a partition plate, and a roll discharger for controlling the discharge amount of the activated carbon having adsorbed the wastes, and preferably, the inlet grill and the outlet grill are designed to prevent the activated carbon in the absorption tower from scattering and being filled with dust in the absorption tower.
10. The fume emission treatment apparatus according to claim 8, wherein the desorption tower comprises a heater for heating the activated carbon having adsorbed the wastes to 300 ℃ or more so that the wastes adsorbed by the activated carbon are desorbed, and a cooler for cooling the desorbed activated carbon to 100 ℃ or less, directly below the heater;
preferably, the heater and the cooler both adopt a multi-tube heat exchanger;
preferably, the secondary treatment system comprises:
the denitration reactor is connected with the outlet flue of the primary treatment system and is used for carrying out denitration reaction on the primarily purified flue gas input from the primary treatment system, and preferably, the denitration reactor adopts a vertically placed catalyst reaction tower;
the ammonia injection grid is positioned at the upstream of the denitration reactor according to the flowing direction of the flue gas and is used for providing ammonia gas;
the concurrent heating furnace is positioned at the upstream of the ammonia spraying grid according to the flowing direction of the flue gas and is used for heating the primarily purified flue gas input from the primary treatment system;
a denitration flue connected to a lower portion of the denitration reactor, for discharging the denitrated gas out of the denitration reactor;
the method comprises the following steps of (1) arranging a low-temperature SCR denitration catalyst in a denitration reactor, wherein the low-temperature SCR denitration catalyst is preferably in a honeycomb catalyst layer form;
preferably, the reaction temperature range of the low-temperature SCR denitration catalyst is 150-180 ℃;
preferably, the holding furnace uses blast furnace gas or converter gas as fuel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010918843.5A CN112275129A (en) | 2020-09-04 | 2020-09-04 | Flue gas emission treatment method and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010918843.5A CN112275129A (en) | 2020-09-04 | 2020-09-04 | Flue gas emission treatment method and equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112275129A true CN112275129A (en) | 2021-01-29 |
Family
ID=74419782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010918843.5A Pending CN112275129A (en) | 2020-09-04 | 2020-09-04 | Flue gas emission treatment method and equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112275129A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04277005A (en) * | 1991-03-01 | 1992-10-02 | Sumitomo Heavy Ind Ltd | Exhaust gas treatment apparatus of urban garbage incinerator |
| CN108371872A (en) * | 2018-04-08 | 2018-08-07 | 中冶长天国际工程有限责任公司 | The desulfuring and denitrifying apparatus of NO_x Reduction by Effective |
| CN110038390A (en) * | 2018-01-16 | 2019-07-23 | 中国石化工程建设有限公司 | Activated coke flue gas purification system and method |
| CN209333456U (en) * | 2018-09-28 | 2019-09-03 | 中冶长天国际工程有限责任公司 | A kind of activated carbon method flue gases purification and low-temperature denitration assembled smoke gas processing system |
-
2020
- 2020-09-04 CN CN202010918843.5A patent/CN112275129A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04277005A (en) * | 1991-03-01 | 1992-10-02 | Sumitomo Heavy Ind Ltd | Exhaust gas treatment apparatus of urban garbage incinerator |
| CN110038390A (en) * | 2018-01-16 | 2019-07-23 | 中国石化工程建设有限公司 | Activated coke flue gas purification system and method |
| CN108371872A (en) * | 2018-04-08 | 2018-08-07 | 中冶长天国际工程有限责任公司 | The desulfuring and denitrifying apparatus of NO_x Reduction by Effective |
| CN209333456U (en) * | 2018-09-28 | 2019-09-03 | 中冶长天国际工程有限责任公司 | A kind of activated carbon method flue gases purification and low-temperature denitration assembled smoke gas processing system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2685136C1 (en) | Method of flue gas desulphurization and denitration and a device | |
| CN102430318B (en) | System for desulfurizing and denitrating active coke flue gas, and process method | |
| CN101785969B (en) | Method of flue gas purification and system thereof | |
| CN203437036U (en) | Sintering fume desulfurization and denitrification device | |
| CN202289840U (en) | Activated coke flue gas desulfurization and denitrification system | |
| CN105688566A (en) | Desulfurization and denitrification device and method for sintering flue gas | |
| CN101279186B (en) | Flue gas dry-type method for simultaneously desulfurizing and denitrating | |
| WO2018000888A1 (en) | Flue gas desulfurization and denitrification method and device capable of preventing corrosion | |
| CN109569183B (en) | Comprehensive circulation treatment method and treatment device for flue gas of double-series sintering system | |
| CN110665352A (en) | Dry desulfurization, denitrification and dust removal device and method for low-sulfur flue gas in cement kiln tail | |
| CN215027580U (en) | Flue gas pretreatment device for capturing carbon dioxide in glass kiln | |
| CN104607015A (en) | Multi-pollutant co-purification method and multi-pollutant co-purification system for sintering flue gas | |
| CN112268293A (en) | Large-scale thermal power generating unit flue gas active coke purification system and method | |
| Yu et al. | A review on reduction technology of air pollutant in current China's iron and steel industry | |
| CN210495771U (en) | Activated carbon desulfurization and denitrification system capable of being comprehensively utilized | |
| CN110496527A (en) | A kind of method of coke oven flue exhuast gas desulfurization denitration | |
| CN107930396B (en) | Method for concentrated and efficient desulfurization and denitrification of sintering flue gas | |
| CN206424781U (en) | Horizontal modularization flue gas desulfurization and denitrification absorption regeneration integral system | |
| CN208583143U (en) | Afterheat utilizing system | |
| CN204469517U (en) | A kind of sinter fume multi-pollutant cooperated purification system | |
| CN112275129A (en) | Flue gas emission treatment method and equipment | |
| CN206334537U (en) | Vertical cylindrical flue gas desulfurization and denitrification absorption regeneration integral system | |
| CN209541450U (en) | A kind of comprehensive treatment of sintering flue gas and the system of utilizing | |
| CN112403215A (en) | Dry-process ultra-clean integrated treatment device and process for high-sulfur coke oven flue gas | |
| CN112870948A (en) | Heat recovery coke oven flue gas multi-pollutant ultra-clean discharge device and process thereof |
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 |
Application publication date: 20210129 |
|
| RJ01 | Rejection of invention patent application after publication |