CN106215538A - One is used for sintering/pelletizing wet desulfurization flue gas deep treatment system - Google Patents

One is used for sintering/pelletizing wet desulfurization flue gas deep treatment system Download PDF

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Publication number
CN106215538A
CN106215538A CN201610721547.XA CN201610721547A CN106215538A CN 106215538 A CN106215538 A CN 106215538A CN 201610721547 A CN201610721547 A CN 201610721547A CN 106215538 A CN106215538 A CN 106215538A
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China
Prior art keywords
demister
flue gas
dust removal
sintering
bundled tube
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CN201610721547.XA
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CN106215538B (en
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常冠钦
陆钢
赵荣志
张秋林
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BEIJING BEIKE ENVIRONMENT ENGINEERING CO LTD
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BEIJING BEIKE ENVIRONMENT ENGINEERING CO LTD
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D45/00Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/12Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
    • B01D45/16Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D50/00Combinations of methods or devices for separating particles from gases or vapours

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)

Abstract

The present invention provides a kind of for sintering/pelletizing wet desulfurization flue gas deep treatment system, belongs to field of environment engineering technology.This system includes intermediate flue, deflector, system entry, airflow uniform distribution plate, bundled tube dedusting demister, honeycomb wet dust removal demister, system exhanst gas outlet, backwashing device and backwashing water floss hole;Deflector and airflow uniform distribution plate are separately mounted in intermediate flue and system entry, change flue gas flow direction, the distribution in bundled tube dedusting demister with honeycomb wet dust removal demister of the uniform flue gas;Bundled tube dedusting demister is connected with honeycomb wet dust removal demister, instead of traditional wet electrical dust precipitator, and honeycomb wet dust removal demister can adjust on off state at any time according to flue gas flow rate, and energy consumption declines to a great extent.The present invention solves steel industry sintering, pelletizing smoke-gas wet desulfurization tailing problem, and the fouling that traditional wet electric cleaner exists, and burn into efflorescence easily occurs, the problems such as energy consumption is high.

Description

One is used for sintering/pelletizing wet desulfurization flue gas deep treatment system
Technical field
The present invention relates to field of environment engineering technology, particularly relate to a kind of for sintering/pelletizing wet desulfurization flue gas the degree of depth Governing system.
Background technology
Steel industry is the industry of a material and energy highly dense type, is consumption of raw materials rich and influential family, is again that energy consumption is big Family, heavy polluter.Within 2015, China's crude steel yield reaches and surpasses 800,000,000 tons, exceedes the 50% of world's crude steel yield.China's steel industry energy Consumption accounts for the 23% of industry total energy consumption, accounts for the 16% of whole nation total energy consumption, and pollutant emission accounts for about the 17% of whole nation total emission volumn, is State key promotes the key industry of energy-saving and emission-reduction.
In 20 cities that China's atmospheric pollution is the most serious, 17 city You Gangqi enterprises.Iron and steel emission reduction is maximum Hebei province within 2015, put into effect new steel and iron industry pollutant emission standard, steel and iron industry sintered particles thing in new standard, two Sulfur oxide, discharged nitrous oxides are tight to 50,180 and 300mg/m by adding respectively3, blast furnace ironmaking particulate matter, sulfur dioxide, nitrogen oxygen Compound discharge is limited to 20,80 and 300mg/m3, steel-making lime kiln white clouds stone kiln roasting particle thing, sulfur dioxide, nitrogen oxides Discharge is limited to 30,80 and 400mg/m3, it is strict in national standard.In the face of new standard promulgation, most of iron and steel enterprise of China can not Maybe can not fully meet discharge standard requirement, in the urgent need to upgrading.If Iron and Steel Enterprises in China Air Pollutant Emission Index reaches Foreign Advanced Lerel, and Air Pollutant Emission total amount will reduce by more than 50, and can significantly improve Beijing-tianjin-hebei Region empty Makings amount.
Sintering, pelletizing process is the most important thing of iron and steel enterprise's pollution section, in current iron and steel enterprise, dust Control Equipment is mainly based on dry electric precipitation device, and dry electric precipitation technology can not efficiently trap fine particulates, sinters flue gas cigarette Low, the water capacity of temperature is big, big containing Dust Capacity, still contain substantial amounts of fine grit pollutant after sulfur removal technology in fume emission, formation Aerosol, produces flue gas conditions of streaking.At present, sintering flue gas conditions of streaking be steel industry common problem urgently to be resolved hurrily it One.
Flue gas enters desulphurization system after dry electric precipitation device, and wet desulphurization is high due to its efficiency, stable, is mesh The main flow sulfur removal technology of front iron and steel enterprise.But wet desulphurization can bring the tailing problem such as gypsum rain, blue smoke.
Wet electrical dust precipitator can solve gypsum rain, the blue smoke problem that wet desulphurization brings, but has the disadvantage in that (1) there is scale problems, affect dedusting except fog effect;(2) easily there is burn into pulverizing problem;(3) operating cost is high.And mesh Front wet electrical dust precipitator is only applied in boiler smoke.Steel industry sinters, the flue gas of pelletizing operation and boiler smoke It is very different, sintering, pelletizing smoke characteristic: (1) SO2Concentration change is big, 600~7000mg/Nm3Interior change;(2) flue gas Variations in temperature is big, can be 80 DEG C~180 DEG C fluctuations;(3), flue gas flow fluctuation big, up to more than 40%;(4) humidity of flue gas Height, between 10%~13% and unstable;(5) flue gas oxygen content is high, between 15%~18%;(6) smoke components is complicated, contains SO2, dust, fluoride, chloride ion, heavy metal, the multiple pollutant such as two English.
Wet electrical dust precipitator that development in recent years is got up and dedusting demister, such as Chinese patent: CN105536990A is " wet Mist electrostatic precipitator ";ZL204276158U " a kind of honeycomb duct wet electrical dust precipitator ";ZL204380855 " New honeycomb shape wet type Electrostatic precipitation system ";ZL201520135634.8 " a kind of corrugated wet scrubber anode ";ZL201520155371.7 " one Plant wet electrical dust precipitator anode ";ZL201420674592.0 " a kind of degree of depth takes off dirt demister ".
Device described by " a kind of the degree of depth take off dirt demister " patent is a kind of single physical separation removing, energy consumption is low, Volume is little, removal effect is notable, but is only applicable to the de-dirt of the saturated flue gas containing a large amount of droplets except mist;And traditional wet is electric Performance of precipitator and the limitation of application, and sintering, the particularity of pelletizing flue gas, therefore by traditional wet electric cleaner Be directly used in the sintering of iron and steel enterprise, the hangover of pelletizing smoke-gas wet desulfurization is administered, it is impossible to reach target, still can not be thorough Solve conditions of streaking.
Summary of the invention
The present invention is to solve steel industry sintering, pelletizing smoke-gas wet desulfurization tailing problem, and traditional wet electricity removes , easily there is burn into efflorescence in the fouling that dirt device exists, the problems such as operating cost is high, it is provided that one is used for sintering/pelletizing wet desulphurization Flue gas deep treatment system.
This system includes intermediate flue, deflector, system entry, airflow uniform distribution plate, bundled tube dedusting demister, honeycomb Wet dust removal demister, system exhanst gas outlet, backwashing device and backwashing water floss hole, deflector is positioned at intermediate flue In, intermediate flue is connected with system entry, and airflow uniform distribution plate is arranged in system entry, bundled tube dedusting demister and system Entrance is connected, and honeycomb wet dust removal demister is connected with bundled tube dedusting demister, system exhanst gas outlet and honeycomb wet type Dedusting demister is connected, and the interior lower section of bundled tube dedusting demister arranges backwashing device, and honeycomb wet dust removal removes mist Being provided above backwashing device in device, backwashing water floss hole is arranged on below system entry.
Wherein, deflector is arranged on inside intermediate flue, for uniform flue gas flow field;
Intermediate flue is arranged on system end, and system entry is arranged on below bundled tube dedusting demister, the one of intermediate flue Side;
Airflow uniform distribution plate is arranged on inside system entry, for uniform flue gas flow field;
Bundled tube dedusting demister is arranged on the lower section of honeycomb wet dust removal demister;
Honeycomb wet dust removal demister is connected with bundled tube dedusting demister, replaces traditional wet electric cleaner, is used for taking off The thorough improvement of sulfur flue gas conditions of streaking;
System exhanst gas outlet is arranged on system the top, and the clean flue gas after process leaves system from exhanst gas outlet, is directly discharged into Air;
Backwashing device is arranged on the interior lower section of bundled tube dedusting demister, and honeycomb wet dust removal demister is interior Top, rinses bundled tube dedusting demister and the laying dust of honeycomb wet dust removal demister inwall for batch (-type), and raising removes Dirt efficiency;
Backwashing water floss hole is arranged on the lower section of system entry, is used for collecting and discharging backwashing water.
The long 1-20m of deflector, wide 1-10m, thick 6-8mm, radian 90 degree, quantity 2-5 block, the starting point of deflector and middle cigarette The initiating terminal in the road i.e. angle of intermediate flue lower end is 30 degree, and deflector terminal is connected with intermediate flue terminal.
Airflow uniform distribution plate is 2-60 block, and particular number determines according to exhaust gas volumn size, the long 1-20m of airflow uniform distribution plate, wide 1- 10m, thick 6-8mm.
Bundled tube dedusting demister height is 1-2m, wide 4-14m, long 4-14m, and cross section is square, and material is for leading Electricity PP.
Honeycomb wet dust removal demister height is 1-2m, wide 4-14m, long 4-14m, and cross section is square, positive plate Material is conduction PP.
In use, when flue gas flow rate is 4-6m/s, honeycomb wet dust removal demister is not turned on, only tube used for bottom pouring Bundle formula dedusting demister;When flue gas flow rate is 3-5m/s, opens bundled tube dedusting demister simultaneously and honeycomb wet type is removed Dirt demister.
This system is for sintering/pelletizing wet desulphurization field.
Having the beneficial effect that of the technique scheme of the present invention:
In such scheme, dedusting demister uses two-piece design, i.e. bottom to be divided into bundled tube dedusting demister, upper part For honeycomb wet dust removal demister.Two-piece design makes the energy consumption of system be greatly reduced, through laboratory test repeatedly and Fluent simulates, and when flue gas flow rate is 4-6m/s, upper part is not turned on, only with the bundled tube dedusting demister of lower part just Cloud in flue gas well can be removed, exiting flue gas qualified discharge;When flue gas flow rate is 3-5m/s, open upper part, Two parts act on simultaneously up and down, and the cloud of the particle diameter being not only stripped of 0.5 more than m drips, and is also dripped by the cloud of 0.5 below m Effective removal, exiting flue gas qualified discharge are arrived.It is equal that the present invention is respectively provided with air-flow at intermediate flue and system entry Fabric swatch, airflow uniform distribution plate enhances the turbulence intensity of flue gas stream so that droplet, dust mutual collision probability in turbulent flow significantly increases Add, thus droplet, dust cohesion are become bigger granule, be easier to be removed in lower part bundled tube dedusting demister; And airflow uniform distribution plate makes flue gas flow field more uniform, it is to avoid flue gas dead angle, thus improve dedusting to the full extent except mist Efficiency.
Accompanying drawing explanation
Fig. 1 be the present invention for sintering/pelletizing wet desulfurization flue gas deep treatment system structure design figure;
Fig. 2 be the present invention for sintering/pelletizing wet desulfurization flue gas deep treatment system bundled tube dedusting demister and honeybee Nest wet dust removal demister figure.
Wherein: 1-intermediate flue;2-deflector;3-system entry;4-airflow uniform distribution plate;5-bundled tube dedusting fills except mist Put;6-honeycomb wet dust removal demister;7-system exhanst gas outlet;8-backwashing device;9-backwashing water floss hole.
Detailed description of the invention
For making the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and tool Body embodiment is described in detail.
The present invention is directed to existing steel industry sintering, pelletizing smoke-gas wet desulfurization tailing problem, and traditional wet electricity , easily there is burn into efflorescence in the fouling that cleaner unit exists, the problems such as operating cost is high, it is provided that and one is used for sintering/and pelletizing wet method takes off Sulfur flue gas deep treatment system.
As it is shown in figure 1, deflector 2 is positioned at intermediate flue 1, intermediate flue 1 is connected with system entry 3, airflow uniform distribution plate 4 Being arranged in system entry 3, bundled tube dedusting demister 5 is connected with system entry 3, honeycomb wet dust removal demister 6 with Bundled tube dedusting demister 5 is connected, and system exhanst gas outlet 7 is connected with honeycomb wet dust removal demister 6, and backwashing water discharges Mouth 9 is arranged on below system entry 3.As in figure 2 it is shown, the interior lower section of bundled tube dedusting demister 5 arranges backwashing device 8, it is provided above backwashing device 8 in honeycomb wet dust removal demister 6.
In specific design, intermediate flue 1 is arranged on system low order end, and flue gas enters middle cigarette the most afterwards from desulphurization system Road 1, contacts with the deflector 2 within intermediate flue 1, and flue gas is more uniform in the effect Fluid field of deflector 2, and part is tiny The grit of granule and droplet can be condensed into grit and the droplet of larger particles.Deflector 2 radian is 90 degree, quantity 2-5 block, water conservancy diversion The starting point of plate 2 is 30 degree with the initiating terminal i.e. angle of lower end of intermediate flue 1, and flue gas continues to move ahead in systems, enters system Entrance 3, system entry 3 is arranged on below bundled tube dedusting demister 4, the left side of intermediate flue 1, the internal cloth of system entry 3 Being equipped with airflow uniform distribution plate 4, this airflow uniform distribution plate 4 acts on identical with deflector 2, plays further uniform flow field and continues tiny The grit of granule and droplet can be condensed into the grit of larger particles and the effect of droplet.Flue gas enters after airflow uniform distribution plate 4 Bundled tube dedusting demister 5, bulky grain grit in flue gas and droplet are at the centrifugal action of bundled tube dedusting demister 5 Under, finally it is captured.When flue gas flow rate is 4-6m/s, owing to flue gas turbulent flow strengthens, most of little granule grits and mist Drip can be condensed into larger particles grit and droplet, larger particles grit and droplet can be fine by bundled tube dedusting demister 5 Remove;When flue gas flow rate is 3-5m/s, flue gas turbulent flow effect is less strong, and only fraction little granule grit and droplet can coagulate Being polymerized to larger particles grit and droplet, most of little granule remains a need for follow up device and removes, the least granule grit and droplet with Honeycomb wet dust removal demister 6, residue grit in flue gas and droplet is entered at honeycomb wet dust removal demister 6 with flue gas In remove further, process clean after flue gas discharged by system exhanst gas outlet 7.Backwashing device 8 is arranged on bundled tube The interior lower section of dedusting demister 5 and the interior top of honeycomb wet dust removal demister 6, rinse bundled tube dedusting for batch (-type) Demister 5 and the laying dust of honeycomb wet dust removal demister 6 inwall, to improve efficiency of dust collection.Backwashing water after backwash Flow in backwashing water floss hole 9, be collected being arranged on backwashing water floss hole, and periodic exhaustion backwashing water.
Deflector 2 design length of the present invention is 1-20m, wide 1-10m, thick 6-8mm;Airflow uniform distribution plate 4 design length 1- 20m, wide 1-10m, thick 6-8mm;Bundled tube dedusting demister 5 design height is 1-2m, wide 4-14m, long 4-14m;Honeycomb is wet Formula dedusting demister 6 design height is 1-2m, wide 4-14m, long 4-14m.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art For, on the premise of without departing from principle of the present invention, it is also possible to make some improvements and modifications, these improvements and modifications are also Should be regarded as protection scope of the present invention.

Claims (8)

1. one kind is used for sintering/pelletizing wet desulfurization flue gas deep treatment system, it is characterised in that: include intermediate flue (1), lead Stream plate (2), system entry (3), airflow uniform distribution plate (4), bundled tube dedusting demister (5), honeycomb wet dust removal demister (6), system exhanst gas outlet (7), backwashing device (8) and backwashing water floss hole (9), deflector (2) is positioned at intermediate flue (1) in, intermediate flue (1) is connected with system entry (3), and airflow uniform distribution plate (4) is arranged in system entry (3), and bundled tube removes Dirt demister (5) is connected with system entry (3), honeycomb wet dust removal demister (6) and bundled tube dedusting demister (5) Be connected, system exhanst gas outlet (7) is connected with honeycomb wet dust removal demister (6), bundled tube dedusting demister (5) interior under Side arranges backwashing device (8), is provided above backwashing device (8) in honeycomb wet dust removal demister (6), recoil Washing water discharge mouth (9) is arranged on system entry (3) lower section.
It is the most according to claim 1 for sintering/pelletizing wet desulfurization flue gas deep treatment system, it is characterised in that: institute State intermediate flue (1) and be arranged on system end;Described system entry (3) is arranged on bundled tube dedusting demister (4) lower section, and It is positioned at intermediate flue (1) side.
It is the most according to claim 1 for sintering/pelletizing wet desulfurization flue gas deep treatment system, it is characterised in that: institute State bundled tube dedusting demister (5) and be arranged on the lower section of honeycomb wet dust removal demister (6);Described system exhanst gas outlet (7) system the top it is arranged on.
It is the most according to claim 1 for sintering/pelletizing wet desulfurization flue gas deep treatment system, it is characterised in that: institute State deflector (2) long 1-20m, wide 1-10m, thick 6-8mm, radian 90 degree, quantity 2-5 block, the starting point of deflector (2) and middle cigarette The angle of initiating terminal i.e. intermediate flue (1) lower end in road (1) is 30 degree, deflector (2) terminal and intermediate flue (1) terminal phase Even.
It is the most according to claim 1 for sintering/pelletizing wet desulfurization flue gas deep treatment system, it is characterised in that: institute Stating airflow uniform distribution plate (4) is 2-60 block, and particular number determines according to exhaust gas volumn size, airflow uniform distribution plate (4) long 1-20m, wide 1- 10m, thick 6-8mm.
It is the most according to claim 1 for sintering/pelletizing wet desulfurization flue gas deep treatment system, it is characterised in that: institute Stating bundled tube dedusting demister (5) height is 1-2m, wide 4-14m, long 4-14m, and cross section is square, and material is conduction PP。
It is the most according to claim 1 for sintering/pelletizing wet desulfurization flue gas deep treatment system, it is characterised in that: institute Stating honeycomb wet dust removal demister (6) height is 1-2m, wide 4-14m, long 4-14m, and cross section is square, positive plate material For conduction PP.
It is the most according to claim 1 for sintering/pelletizing wet desulfurization flue gas deep treatment system, it is characterised in that: when When flue gas flow rate is 4-6m/s, honeycomb wet dust removal demister (6) is not turned on, and only opens bundled tube dedusting demister (5); When flue gas flow rate is 3-5m/s, open bundled tube dedusting demister (5) and honeycomb wet dust removal demister (6) simultaneously.
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CN106955525A (en) * 2017-04-29 2017-07-18 贵州大学 A kind of efficient reversed cleaning device of pipeline Inner filter net
CN107042048A (en) * 2017-03-16 2017-08-15 华南理工大学 A kind of gravity heat-pipe type defogging method and demister
CN107281871A (en) * 2017-07-06 2017-10-24 北京北科环境工程有限公司 It is a kind of to be used to sinter/improvement the device of pelletizing wet desulfurization flue gas deep treatment
CN107321157A (en) * 2017-07-19 2017-11-07 北京北科环境工程有限公司 A kind of horizontal wet desulphurization device

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CN107042048A (en) * 2017-03-16 2017-08-15 华南理工大学 A kind of gravity heat-pipe type defogging method and demister
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CN106955525A (en) * 2017-04-29 2017-07-18 贵州大学 A kind of efficient reversed cleaning device of pipeline Inner filter net
CN107281871A (en) * 2017-07-06 2017-10-24 北京北科环境工程有限公司 It is a kind of to be used to sinter/improvement the device of pelletizing wet desulfurization flue gas deep treatment
CN107321157A (en) * 2017-07-19 2017-11-07 北京北科环境工程有限公司 A kind of horizontal wet desulphurization device

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