CN105233657A - Flue gas desulphurization and dedusting advanced treatment technology and apparatus thereof - Google Patents

Flue gas desulphurization and dedusting advanced treatment technology and apparatus thereof Download PDF

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Publication number
CN105233657A
CN105233657A CN201510746673.6A CN201510746673A CN105233657A CN 105233657 A CN105233657 A CN 105233657A CN 201510746673 A CN201510746673 A CN 201510746673A CN 105233657 A CN105233657 A CN 105233657A
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flue gas
dedusting
tower
dust
module
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马健华
苏俊
朱继红
史晓莉
王慧
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GUANGZHOU TINCI SANHE ENVIRONMENT PROTECTION ENGINEERING Co Ltd
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GUANGZHOU TINCI SANHE ENVIRONMENT PROTECTION ENGINEERING Co Ltd
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Abstract

The invention discloses a flue gas desulphurization and dedusting advanced treatment technology and an apparatus thereof. A desulfurization tower module is connected with a dedusting tower module, flue gas enters the desulfurization tower module from a gas inlet and undergoes desulphurization, the flue gas goes through a tubular grating rod layer from bottom to top, is in countercurrent contact with a circulating slurry to realize absorption desulphurization, enters a demister, is demisted and enters the upper end of a dedusting tower body, downward flue gas is in contact with circulating water sprayed from a secondary spray module, goes through a dedusting rod layer, is dedusted, enters a two-stage dedusting demister and is demisted, and demisted flue gas is discharged to a chimney. Multiple treatments are carried out to realize advanced purification of the flue gas, so the concentration of sulfur dioxide in the flue gas is controlled to be lower than 35mg/Nm<3>, and the concentration of flue dusts in the flue gas is controlled to be lower than 10mg/Nm<3>.

Description

A kind of flue gas desulfurization and dedusting advanced treatment process and equipment
Technical field
The present invention relates to tail gas clean-up field, be specifically related to a kind of flue gas desulfurization and dedusting advanced treatment process and equipment.
Background technology
Flue gas desulfurization (Fluegasdesulfurization, be called for short FGD) is the sulfur method of unique large-scale commercial application in the world, is to control the very effective and practical technological means of Acid Rain Pollution that sulfur dioxide causes.Wet Limestone (lime)/gypsum, owing to having absorbent aboundresources, the advantage such as with low cost, has become the maximum a kind of flue gas desulfurization technique applied in the world.
Over nearly 10 years, the use amount increase of CHINESE COAL result in the generation of the sulfur dioxide gas exceeding half.Generating is China's basic industry, plays a part very important in the national economic development, and coal fired power generation accounts for more than 70% of overall generating at home, along with developing rapidly of national economy is grown with each passing day to the demand of electric power.But coal fired power generation is also traditional heavy polluter, all there is haze weather in various degree in northern China the greater part in recent years.Country also constantly updates the requirement of pollutant control, and the pollutant emission index of China also ranked among the international rank of advanced units in recent years.The atmosphere pollution of China remains pollution that caused by coal burning, major pollutants SO 2and flue dust, wherein industrial discharge SO 2more than 70% of war total amount.
National Development and Reform Commission, Chinese Ministry of Environmental Protection and Bureau of Energy combine and have printed and distributed " coal electricity energy-saving and emission-reduction upgrading and transformation action plan (2014-2020) ", newly-built and in-service Thermal generation unit Air Pollutant Emission concentration is explicitly called for reach or (namely under benchmark oxygen content 6% condition, flue dust, sulfur dioxide emissioning concentration be not respectively higher than 10mg/Nm close to reaching gas turbine unit discharge restriction 3and 35mg/Nm 3).
Absorption operation is carried out in lime stone (lime)-gypsum desulfurization that tradition desulfurizing tower adopts, for hollow-spraying-tower, three layers or more layer spraying layers are only set in tower, because in tower, air-flow velocity is too fast, cannot effectively and aqua calcis drop fully react, cause sulfur dioxide absorption efficiency inadequate, adopt traditional lime stone (lime)-gypsum sulfur removal technology can not meet the emission limit of new nation's standard.If reach discharge index by increasing tower body height and spray flux, cost can be increased undoubtedly.
Generally speaking, in order to reach the ultra-clean discharge of flue dust, individual power plants is selected to add a set of wet electrical dust precipitator in desulphurization system rear end, to play the effect making a final check and gather dust.Although wet desulphurization device has certain washing removal effect to dust, discharged gas fume inevitably carries the slurries of some, and wherein contained solid and salt can finally form new pollutant again, and dust inhibition is had a greatly reduced quality.The sulphur trioxide aerosols that boiler combustion is simultaneously formed cannot effectively remove, and becomes the important component part of PM2.5 particle after discharge.And the denitrification apparatus extensively adopted exacerbates the content of sulfur trioxide in flue gas further.Desulphurization system rear end installs wet scrubber additional, and cost of investment is high, floor space is large.
Summary of the invention
For the problems referred to above, the present invention aim to provide a kind of can the flue gas desulfurization and dedusting advanced treatment process of deep purifying sulfur-bearing ash-laden gas and equipment.
For realizing this technical purpose, the solution of the present invention is: a kind of flue gas desulfurization and dedusting advanced treatment device, comprise desulfurizing tower module, described desulfurizing tower module comprises desulfurization tower body, one-level spray module, tubular type grid rod layer, primary cycle pump, demister, and described desulfurization tower body is disposed with tubular type grid rod layer, one-level spray module and demister from bottom to up; Described one-level spray module is connected with primary cycle pump respectively by pipeline, is provided with tubular type grid rod layer below described one-level spray module, and described tubular type grid rod layer is positioned at above air inlet, and described tubular type grid rod layer is composite layered structure;
The top of described desulfurizing tower module is also connected with gas wash tower module by pipeline,
Described gas wash tower module comprises dedusting tower body, secondary spray module, secondary cycle pump, dedusting demister, described dedusting tower body top is also provided with secondary spray module, described secondary spray module is connected with secondary cycle pump by pipeline, in the middle part of described dedusting tower body, side is provided with exhaust outlet, described exhaust outlet is connected with chimney, described have dedusting demister to be arranged in the middle part of dedusting tower body side, and described dedusting demister and mist eliminator flushing are connected with technique water tank by pipeline.
As preferably, the percent opening of described tubular type grid rod layer is 30% ~ 60%, and the number of plies of described tubular type grid rod layer is more than 2 layers or 2 layers, and the grid rod in described tubular type grid rod layer is for being arranged in parallel.
As preferably, be provided with dust removing bar layer in described dedusting tower body, this dust removing bar layer top is also provided with portable plate, and the percent opening of described dust removing bar layer is 25% ~ 60%, and the number of plies of described dust removing bar layer is one or more layers.
As preferably, described dedusting tower body, in the T font of toppling over, is provided with plural layer deflector in the middle part of described dedusting tower body side.
As preferably, described dedusting demister comprises one-level demist plate and secondary demister, and described one-level demist plate and secondary demister be arranged in parallel, vertical installation.
A kind of flue gas desulfurization and dedusting advanced treatment process, concrete operations flow process is as follows:
The first step, desulfurization, flue gas enters desulfurizing tower module from air inlet after pretreatment and carries out desulfurization, and flue gas is first through tubular type grid rod layer, and the particle in flue gas is trapped, the SO in flue gas colliding through tubular type grid rod layer 2spray with one-level the loop slurry that module sprays out and carry out reverse contact, the SO in the liquid absorption flue gas of slurry surface 2tubular type grid rod layer changes the flow velocity of flue gas simultaneously, flue gas forms eddy current around tubular type grid rod simultaneously increases gas-liquid contact time and improves Flow Field Distribution, the slurries of flue gas to upper strata are made to create strong collision effect, improve gas-liquid mass transfer efficiency, circulation fluid slurry at the bottom of tower is pumped to desulfurization tower body tower top by primary cycle pump and sprays, and serum recycle uses;
Second step, flue gas enters into from the bottom up after demister carries out demist and enters gas wash tower body upper end after desulfurization, and flue gas and secondary spray the circulation fluid that module sprays out to carry out contacting, washing;
3rd step, flue gas enters gas wash tower subsequently, and when the dust removing bar layer by dust removing body tower, flue gas cross section diminishes instantaneously, and the speed of medium increases instantaneously; After dust removing bar layer, flow area increases again, velocity of medium is instantaneous slack-off, proportion due to water and dust is greater than the proportion of flue gas, its inertia is also greater than flue gas, from top to bottom flow because flue gas and wash liquid also flow simultaneously, thus strengthening Gravity Separation effect, make the dust in flue gas just remove out at faster speed from flue gas together with water; The deflector that flue gas is arranged in dedusting tower body, even by the smoke distribution after deflector, and the flow direction of flue gas and the exhaust gases passes that dedusting tower body provides move towards consistent.
4th step, described flue gas carries out demist through dedusting demister in the middle part of dedusting tower body, and the flue gas after final purification is discharged via chimney.
As preferably, in the described first step when sulfur dioxide in flue gas content increases, increase the spray flux of loop slurry, arrange the tubular type grid rod layer that percent opening is little, the collision effect that flue gas and loop slurry are produced strengthens, and improves desulfuration efficiency simultaneously.
As preferably, in described 3rd step when smoke content is higher, dust removing bar percent opening answers corresponding minimizing; Or increase portable plate area, dust removing bar Pressure Drop increases, and promotes efficiency of dust collection.
As preferably, the flue gas flow scope of described air inlet is 100000m 3/ h ~ 2200000m 3/ h, the spray flux scope 2000m of the loop slurry of the described first step 3/ h ~ 25000m 3/ h.
Beneficial effect of the present invention is:
1. when flue gas enters desulfurizing tower tower body, a vortex can be formed in import department, can by slurries to being back to tower gas approach time serious, after tubular type grid rod layer is set in gas wash tower, the flue gas entering tower is redistributed again, makes flue gas being more evenly distributed in uptake zone, after tubular type grid rod layer, flue gas by uptake zone, more easily ensures reaching of high desulfurization efficiency in the mode close to " laminar flow ".
2. after tubular type grid rod layer is set, the gas from bottom to top run and the slurries from top to bottom sprayed produce fierce gas-liquid collision in the middle of two grid sides, constantly break by " collection skin " effect of virgin pulp liquid drop sulfur dioxide absorption, produce the sorbent surface of new low concentration.Simultaneously from longitudinal vertical cross-section of tubular type grid rod layer, two often adjacent pipe rod cross sections, gap can produce the effect being equal to venturi passage, thus change the flow velocity of flue gas, the slurries of this flue gas to upper strata create strong collision effect, thus flue gas can touch the slurries of less droplet fully, make the haptoreaction of sulfur dioxide and slurries more thorough.
3. the tubular type grid rod layer in desulfurizing tower tower body is one or more layers structure, and every interlayer has certain gap, can establish different percent openings for every layer, percent opening is less, faster by tubular type grid rod layer flue gas flow rate, this flue gas is fiercer to slurries collision effect, the corresponding increase of absorption efficiency; Along flue gas flow path direction, every layer of tubular type grid rod layer percent opening successively reduces, and absorbs step by step, significantly improve the assimilation effect of sulphur under can ensureing the prerequisite of large flow velocity; The position that tubular type grid rod layer is arranged also can adjust according to existence conditions flexibly.
4. arrange one deck dust removing bar layer in gas wash tower, flue gas is when by dust removing bar layer, and because cross section diminishes instantaneously, the speed of medium increases instantaneously; After dust removing bar layer, flow area increases again, and velocity of medium is instantaneous slack-off, proportion due to water and dust is greater than the proportion of flue gas, its inertia is also greater than flue gas, and the dust in flue gas just removes out at faster speed together with water from flue gas, thus reaches the effect of dedusting.
5. be provided with plural layer deflector in gas wash tower, the smoke distribution entering defrosting function district, downstream can be made even, and the flow direction controlling flue gas move towards consistent with exhaust gases passes, avoids the appearance of flue gas turbulent phenomenon.
6. be provided with two-stage defrosting function district in gas wash tower, comprise one-level demist plate and secondary demister, the droplet carried can well be removed in flue gas.
7. the flue gas after this PROCESS FOR TREATMENT, the concentration of sulfur dioxide concentration and flue dust can control at 35mg/Nm respectively 3and 10mg/Nm 3below.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is flow chart of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further details.
As shown in Figure 1, 2, a kind of flue gas desulfurization and dedusting advanced treatment device, comprise pretreatment module 17, desulfurizing tower module, described desulfurizing tower module comprises desulfurization tower body 1, one-level spray module 4, tubular type grid rod layer 5, primary cycle pump 15, demister 3, and described desulfurization tower body 1 is disposed with tubular type grid rod layer 5, one-level spray module 4 and demister 3 from bottom to up; Described one-level spray module 4 is connected with primary cycle pump 15 respectively by pipeline, is provided with tubular type grid rod layer 5 below described one-level spray module 4, and described tubular type grid rod layer 5 is positioned at above air inlet 6, and described tubular type grid rod layer 5 is composite layered structure;
The top of described desulfurizing tower module is also connected with gas wash tower module by pipeline,
Described gas wash tower module comprises dedusting tower body 2, secondary spray module 7, secondary cycle pump 16, dedusting demister, described dedusting tower body 2 top is also provided with secondary spray module 7, described secondary spray module 7 is connected with secondary cycle pump 16 by pipeline, in the middle part of described dedusting tower body 2, side is provided with exhaust outlet 18, described exhaust outlet 18 is connected with chimney 14, described have dedusting demister to be arranged on dedusting tower body 2 one middle side part, and described dedusting demister and demister 3 are connected with technique water tank 12 by pipeline.
When gas enters absorption tower, a vortex can be formed in import department, can by slurries to being back to smoke inlet flue time serious, after desulfurizing tower entrance top arranges tubular type grid rod layer, the flue gas entering desulfurizing tower is redistributed, make flue gas being more evenly distributed in desulfurizing tower uptake zone, after tubular type grid rod layer, flue gas is to pass through uptake zone close to the mode of " laminar flow ", more easily ensure reaching of high desulfurization efficiency, the percent opening of described tubular type grid rod layer 5 is 30% ~ 60%, the number of plies of described tubular type grid rod layer 5 is more than 2 layers or 2 layers, grid rod 5 in described tubular type grid rod layer is for being arranged in parallel.
When flue gas enters gas wash tower, by again redistributing after dust removing bar layer, also flue gas is made to be more evenly distributed in the uptake zone of gas wash tower, flue gas and spray liquid following current enter dust removing bar layer, reach different dust concentration emission requests by controlling the Pressure Drop of dust removing bar layer, be provided with dust removing bar layer 8 in described dedusting tower body 2, this dust removing bar layer 8 end is also provided with portable plate 13, the percent opening of described dust removing bar layer 8 is 25% ~ 60%, and the number of plies of described dust removing bar layer 8 is one or more layers.The setting of portable plate be can control dust removing bar layer Pressure Drop within the scope of 600 ~ 1800Pa, thus can control gas wash tower outlet flue dust concentration of emission.
In order to increase the effect of dust removal process, described dedusting tower body 2 is in the T font of toppling over, and described dedusting tower body 2 one middle side part is provided with plural layer deflector 9.Described dedusting tower body, in the T font of toppling over, is provided with plural layer deflector in the middle part of described dedusting tower body side.Smoke distribution can be made even by setting up deflector, the flow direction controlling flue gas moves towards consistent with exhaust gases passes, avoids the appearance of flue gas turbulent phenomenon.
In order to improve except fog effect, described dedusting demister comprises one-level demist plate 10 and secondary demister 11, and described one-level demist plate 10 and secondary demister 11 be arranged in parallel, vertical installation.One-level demist plate can remove the water carried in a large amount of flue gas, and secondary demister then can remove the droplet of parcel fine dusts.
A kind of flue gas desulfurization and dedusting advanced treatment process, concrete operations flow process is as follows:
The first step, desulfurization, flue gas, by pretreatment dedusting, enters desulfurizing tower module from air inlet 6 after pretreatment and carries out desulfurization, and flue gas is first through tubular type grid rod layer 5, and the particle in flue gas collides and is trapped, the SO in flue gas when through tubular type grid rod layer 5 2spray with one-level the loop slurry that module 4 sprays out to contact, the water of slurry surface absorbs the SO in flue gas 2, simultaneously tubular type grid rod layer 5 changes the flow velocity of flue gas, makes the slurries of flue gas to upper strata create strong collision effect, accelerates absorption process, and circulation fluid slurry at the bottom of tower is pumped to desulfurization tower body 2 tower top by primary cycle pump 15 and carries out Sprayer Circulation simultaneously;
Second step, flue gas enters into from the bottom up after demister 3 carries out demist and enters gas wash tower body 2 upper end after loop slurry Absorption Desulfurization, and flue gas and secondary spray the circulation fluid that module 7 sprays out to carry out contacting, washing;
3rd step, final dusting, the flue gas after washing is by being provided with portable plate 13 in dedusting tower body 2, and flue gas is subject to the effect of portable plate 13, and pressure reduces; When flue gas enters the dust removing bar layer 8 of dust removing body tower 2 subsequently, flue gas cross section diminishes instantaneously, and the speed of medium increases instantaneously; After dust removing bar layer 8, flow area increases again, and velocity of medium is instantaneous slack-off, and the proportion due to water and dust is greater than the proportion of flue gas, and its inertia is also greater than flue gas, makes the dust in flue gas just remove out at faster speed from flue gas together with water; Flue gas then enters the deflector 9 arranged in dedusting tower body 2, even by the smoke distribution after deflector 9, and the flow direction of flue gas and the exhaust gases passes that dedusting tower body 2 provides move towards consistent.
4th step, described flue gas carries out demist through dedusting demister in the middle part of dedusting tower body 2, and the flue gas after final purification is discharged via chimney 14.
Wherein be provided with portable plate in gas wash tower, the size of portable plate area directly determines the Pressure Drop by dust removing bar layer, the outlet smoke dust discharge concentration that different Pressure Drops is corresponding different.Flue gas after washing is by the dust removing bar layer of gas wash tower, and because cross section diminishes instantaneously, the speed of medium increases instantaneously; After dust removing bar layer, flow area increases again, and velocity of medium is instantaneous slack-off, proportion due to water and dust is greater than the proportion of flue gas, its inertia is also greater than flue gas, and the dust in flue gas just removes out at faster speed together with water from flue gas, thus reaches the effect of dedusting.Be provided with deflector in gas wash tower, the smoke distribution entering defrosting function district, downstream can be made even, and the flow direction controlling flue gas move towards consistent with exhaust gases passes, avoids the appearance of flue gas turbulent phenomenon.
In order to successfully manage the higher and flow velocity flue gas faster of dust content, in the described first step when flue gas flow rate, dust content increase, increase the spray flux of loop slurry, the collision effect that flue gas and loop slurry are produced strengthens.Flue gas flow rate is worked as in the described first step, when dust content increases, increase the spray flux of loop slurry, the collision effect that the slurries of flue gas to upper strata create is fiercer, thus flue gas can touch the slurries of less droplet fully, make the haptoreaction of sulfur dioxide and slurries more thorough.
In order to successfully manage the higher flue gas of dust content, in described 3rd step when dust content is higher, the corresponding minimizing of dust removing bar percent opening; Or increase portable plate area, make to increase dust removing bar Pressure Drop, promote efficiency of dust collection.After the corresponding minimizing of dust removing bar percent opening, the proportion due to water and dust is greater than the proportion of flue gas, and its inertia is also greater than flue gas, make the dust in flue gas just together with water at faster speed from flue gas the amount of removing increase; As dust removing bar percent opening cannot be changed, portable plate area can be increased, thus increase dust removing bar Pressure Drop, finally reach outlet smoke dust discharge concentration.
In order to mate the spray flux of flue gas flow and loop slurry, the flue gas flow scope of described air inlet is 100000m 3/ h ~ 2200000m 3/ h, the spray flux scope 2000m of the loop slurry of the described first step 3/ h ~ 25000m 3/ h.The spray flux of flue gas flow and loop slurry matches, and can ensure that dust in flue gas and sulfur dioxide are effectively absorbed, avoiding exceeding load cannot purify.
Concrete engineering experimental test is as follows:
Certain power plant (670t/h HTHP coal-powder boiler) carries out FGD Retrofitting Project test, and treatment quantity is 684620m 3/ h, former entrance sulfur dioxide concentration is 4600mg/Nm 3, outlet sulfur dioxide emissioning concentration is 200mg/Nm 3.
Because newly a collection of combustion sulfur content of coal increases, entrance sulfur dioxide concentration is caused to reach 6000mg/Nm 3, outlet sulfur dioxide emissioning concentration requires as 35mg/Nm 3; Desulfurizing tower entrance dust concentration is 200mg/Nm 3, require that outlet dust concentration meets 10mg/Nm 3; Do not reach above-mentioned new standard requirement, need to carry out flue gas desulfurization and dedusting improvement project.
1. transformation project one: increase desulfurizing tower Module cycle pump
Due to the increase of entrance sulfur dioxide concentration, and the raising that outlet sulfur dioxide (SO2) emissions require, original recycle slurry liquid measure can not meet emission request; Original three circulation slurry pumps, separate unit flow 4200m 3/ h, total serum recycle amount is 12600m 3/ h, liquid-gas ratio is 12.5L/m 3; Transformation increase by two circulation slurry pumps, separate unit flow is 6000m 3/ h, liquid-gas ratio is increased to 24L/m 3; Due to newly-increased two circulation slurry pumps, correspondingly need newly-increased two-layer spraying layer.
2. transformation project two: increase tubular type grid rod layer in the middle of desulfurizing tower module
The two-layer tubular type grid rod layer arranged above the smoke inlet on absorption tower, and two-layer grid rod layer is set below newly-increased spraying layer;
After tubular type grid rod layer is set, the gas from bottom to top run and the slurries from top to bottom sprayed produce fierce gas-liquid collision in the middle of two grid rods, constantly break by " collection skin " effect of virgin pulp liquid drop sulfur dioxide absorption, produce the sorbent surface of new low concentration.Simultaneously from longitudinal vertical cross-section of tubular type grid rod layer, two often adjacent pipe rod cross sections, gap can produce the effect being equal to venturi passage, thus change the flow velocity of flue gas, the slurries of this flue gas to upper strata create strong collision effect, thus flue gas can touch the slurries of less droplet fully, enhance the absorption mass transport process of sulfur dioxide; Smoke distribution after grid rod evenly, flue gas and slurries can be reacted better.
3. transformation project three: set up gas wash tower module at the gas outlet place of desulfurizing tower module
In order to reach 10mg/Nm 3soot emissions requirement, need to set up gas wash tower module.Described desulfurizing tower module is connected with gas wash tower module; Gas wash tower set gradually spraying layer, dust removing bar layer, except fog-zone.
Arrange one deck dust removing bar layer in gas wash tower, flue gas is when by dust removing bar lamellar spacing, and because cross section diminishes instantaneously, the speed of medium increases instantaneously; After dust removing bar layer, flow area increases again, and velocity of medium is instantaneous slack-off, proportion due to water and dust is greater than the proportion of flue gas, its inertia is also greater than flue gas, and the dust in flue gas just removes out at faster speed together with water from flue gas, thus reaches the effect of dedusting; Dust removing bar layer is also provided with adjusting plate, and by the size of adjustable plate thus the Pressure Drop changed by grid rod layer, and then can be met the requirement of different smoke dust discharge concentration, for this transformation project, Pressure Drop controls at 1000Pa.
The above; be only preferred embodiment of the present invention; not in order to limit the present invention, every above embodiment is done according to technical spirit of the present invention any trickle amendment, equivalently replace and improve, within the protection domain that all should be included in technical solution of the present invention.

Claims (9)

1. a flue gas desulfurization and dedusting advanced treatment device, comprise desulfurizing tower module, described desulfurizing tower module comprises desulfurization tower body, one-level spray module, tubular type grid rod layer, primary cycle pump, demister, and described desulfurization tower body is disposed with tubular type grid rod layer, one-level spray module and demister from bottom to up; Described one-level spray module is connected with primary cycle pump respectively by pipeline, it is characterized in that: below described one-level spray module, be provided with tubular type grid rod layer, described tubular type grid rod layer is positioned at above air inlet, and described tubular type grid rod layer is composite layered structure;
The top of described desulfurizing tower module is also connected with gas wash tower module by pipeline,
Described gas wash tower module comprises dedusting tower body, secondary spray module, secondary cycle pump, dedusting demister, described dedusting tower body top is also provided with secondary spray module, described secondary spray module is connected with secondary cycle pump by pipeline, in the middle part of described dedusting tower body, side is provided with exhaust outlet, described exhaust outlet is connected with chimney, described have dedusting demister to be arranged in the middle part of dedusting tower body side, and described dedusting demister and mist eliminator flushing are connected with technique water tank by pipeline.
2. flue gas desulfurization and dedusting advanced treatment device according to claim 1, it is characterized in that: the percent opening of described tubular type grid rod layer is 30% ~ 60%, the number of plies of described tubular type grid rod layer is more than 2 layers or 2 layers, and the grid rod in described tubular type grid rod layer is for being arranged in parallel.
3. flue gas desulfurization and dedusting advanced treatment device according to claim 1, it is characterized in that: in described dedusting tower body, be provided with dust removing bar layer, this dust removing bar layer top is also provided with portable plate, the percent opening of described dust removing bar layer is 25% ~ 60%, and the number of plies of described dust removing bar layer is one or more layers.
4. flue gas desulfurization and dedusting advanced treatment device according to claim 1, is characterized in that: described dedusting tower body, in the T font of toppling over, is provided with plural layer deflector in the middle part of described dedusting tower body side.
5. flue gas desulfurization and dedusting advanced treatment device according to claim 1, is characterized in that: described dedusting demister comprises one-level demist plate and secondary demister, and described one-level demist plate and secondary demister be arranged in parallel, vertical installation.
6. a flue gas desulfurization and dedusting advanced treatment process, is characterized in that: concrete operations flow process is as follows:
The first step, desulfurization, flue gas enters desulfurizing tower module from air inlet after pretreatment and carries out desulfurization, and flue gas is first through tubular type grid rod layer, and the particle in flue gas is trapped, the SO in flue gas colliding through tubular type grid rod layer 2spray with one-level the loop slurry that module sprays out and carry out reverse contact, the SO in the liquid absorption flue gas of slurry surface 2tubular type grid rod layer changes the flow velocity of flue gas simultaneously, flue gas forms eddy current around tubular type grid rod simultaneously increases gas-liquid contact time and improves Flow Field Distribution, the slurries of flue gas to upper strata are made to create strong collision effect, improve gas-liquid mass transfer efficiency, circulation fluid slurry at the bottom of tower is pumped to desulfurization tower body tower top by primary cycle pump and sprays, and serum recycle uses;
Second step, flue gas enters into from the bottom up after demister carries out demist and enters gas wash tower body upper end after desulfurization, and flue gas and secondary spray the circulation fluid that module sprays out to carry out contacting, washing;
3rd step, flue gas enters gas wash tower subsequently, and when the dust removing bar layer by dust removing body tower, flue gas cross section diminishes instantaneously, and the speed of medium increases instantaneously; After dust removing bar layer, flow area increases again, velocity of medium is instantaneous slack-off, proportion due to water and dust is greater than the proportion of flue gas, its inertia is also greater than flue gas, from top to bottom flow because flue gas and wash liquid also flow simultaneously, thus strengthening Gravity Separation effect, make the dust in flue gas just remove out at faster speed from flue gas together with water; The deflector that flue gas is arranged in dedusting tower body, even by the smoke distribution after deflector, and the flow direction of flue gas and the exhaust gases passes that dedusting tower body provides move towards consistent.
4th step, described flue gas carries out demist through dedusting demister in the middle part of dedusting tower body, and the flue gas after final purification is discharged via chimney.
7. a kind of flue gas desulfurization and dedusting advanced treatment process according to claim 5, it is characterized in that: in the described first step when sulfur dioxide in flue gas content increases, increase the spray flux of loop slurry, the tubular type grid rod layer that percent opening is little is set simultaneously, the collision effect that flue gas and loop slurry are produced strengthens, and improves desulfuration efficiency.
8. a kind of flue gas desulfurization and dedusting advanced treatment process according to claim 5, is characterized in that: in described 3rd step when smoke content is higher, and dust removing bar percent opening answers corresponding minimizing; Or increase portable plate area, dust removing bar Pressure Drop increases, and promotes efficiency of dust collection.
9. a kind of flue gas desulfurization and dedusting advanced treatment process according to claim 5, is characterized in that: the flue gas flow scope of described air inlet is 100000m 3/ h ~ 2200000m 3/ h, the spray flux scope 2000m of the loop slurry of the described first step 3/ h ~ 25000m 3/ h.
CN201510746673.6A 2015-11-03 2015-11-03 Flue gas desulphurization and dedusting advanced treatment technology and apparatus thereof Pending CN105233657A (en)

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CN108043159A (en) * 2017-12-30 2018-05-18 柴玲飞 A kind of industrial exhaust gas purifying processing device

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Application publication date: 20160113