CN105169924A - Wet desulphurization device with effect-raising grating plate - Google Patents

Wet desulphurization device with effect-raising grating plate Download PDF

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Publication number
CN105169924A
CN105169924A CN201510571913.3A CN201510571913A CN105169924A CN 105169924 A CN105169924 A CN 105169924A CN 201510571913 A CN201510571913 A CN 201510571913A CN 105169924 A CN105169924 A CN 105169924A
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CN
China
Prior art keywords
effect screen
effect
tower
screen
spraying layer
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Pending
Application number
CN201510571913.3A
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Chinese (zh)
Inventor
赵子灿
闫旭东
严沁晗
赵晓宇
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Wuhan Zhongdian Chuneng Environmental Protection Engineering Co Ltd
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Wuhan Zhongdian Chuneng Environmental Protection Engineering Co Ltd
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Priority to CN201510571913.3A priority Critical patent/CN105169924A/en
Publication of CN105169924A publication Critical patent/CN105169924A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a wet desulphurization device with an effect-raising grating plate. The wet desulphurization device with the effect-raising grating plate comprises a tower body, wherein a conical exhaust gas outlet, a demister, spraying layers, an exhaust gas inlet, a pulp pool, an oxidation device and a stirring pump are arranged on the tower body; the demister is arranged under the conical exhaust gas outlet; uniform-perforated effect-raising grating plate in a uniform perforating way is arranged under the demister; the spraying layers are arranged under the uniform-perforated effect-raising grating plate; a non-uniform perforated effect-raising grating plate with non-uniform perforated arrangement on side walls is arranged at 1.5m under the first layer of spraying layer; a left-right-side non-uniform perforated effect-raising grating plate with left-right-side non-uniform perforated arrangement is arranged under the third layer of spraying layer; a flue inlet is formed under the effect-raising grating plate; the pulp pool is arranged under the flue inlet; the oxidation device is arranged in the middle of the pulp pool; the stirring pump is arranged under one side of the pulp pool. Compared with the prior art, the wet desulphurization device with the effect-raising grating plate can forcedly balance a flow field in the tower, enhances gas-liquid turbulence and intensifies adsorption, and is high in desulphurization efficiency and high in collection efficiency; the dissolution rate of absorbing agent is improved, the liquid-gas ratio is reduced, the power consumption is reduced, the operational flexibility is strong, and the applicable range is wide.

Description

The wet desulphurization device of effect screen carried by a kind of band
Technical field
The present invention relates to a kind of flow-through type screen, be specifically related to the wet desulphurization device that effect screen carried by a kind of band.
Background technology
China's haze phenomenon takes place frequently, and the pollutant such as sulfur dioxide, flue dust of coal fired power plant discharge is one of principal element causing haze phenomenon.Chinese Ministry of Environmental Protection proposes " coal electricity energy-saving and emission-reduction upgrading and transformation action plan (2014 ~ the year two thousand twenty) " (send out and change the energy [2014] No. 2093 literary compositions), require that Thermal generation unit Air Pollutant Emission concentration reaches gas turbine group discharge restriction substantially, namely, under benchmark oxygen content 6% condition, flue dust, sulfur dioxide emissioning concentration be not respectively higher than 10mg/Nm 3, 35mg/Nm 3.Wherein, some importance region and local government are according to up-to-date environmental requirement, and further provide minimum discharge transformation requirement, namely require Thermal generation unit air pollution emission concentration limit, flue dust is not higher than 5mg/Nm 3, sulfur dioxide is not higher than 35mg/Nm 3requirement.
More than 80% Thermal generation unit adopts the sulfur dioxide in limestone-gypsum method wet type device removal flue gas at home, and this device is based on the wet desulphurization absorption tower of hollow-spraying-tower mode.Directly carry out contacting, reacting with the slurries that spraying layer sprays after this device flue gas enters absorption tower, flue gas is due to single entrance in void tower, and can form uneven low regime and high velocity in tower, low regime exhaust gas volumn is little, slurries amount is large, and slurries absorb not exclusively; High velocity, exhaust gas volumn is large, slurries amount is little, and easily produce the pollutant such as sulfur dioxide in flue gas, dirt and escape, drop can carry higher by high velocity smoke simultaneously, can wash away demister, causes demister to block and corrosion.Meanwhile, this device gas liquid interfacial area is little, need realize higher desulfuration efficiency by improving liquid-gas ratio.Meanwhile, the efficiency of dust collection of this device is only 50%, and especially PM2.5 removal efficiency is less than 40%; Meanwhile, this device desulfuration efficiency is only 95%, is difficult to reach more than 97%, does not have the successful case of minimum discharge requirement in Practical Project runs.
Summary of the invention
The object of the present invention is to provide the even flow field in tower of a kind of pressure, the turbulence of strengthening gas-liquid, strengthening to absorb, improve the rate of dissolution of absorbent, reduction liquid-gas ratio, reduces power consumption, and operating flexibility is strong, and the wet desulphurization device of effect screen carried by band applied widely.
For achieving the above object, the invention provides following technical scheme:
The wet desulphurization device of effect screen carried by a kind of band, comprise tower body, tower body adopts hollow-spraying-tower desulfurizing tower, tower body is provided with taper exhanst gas outlet, demister, spraying layer, smoke inlet, stock tank, oxidation furnaces and mixing pump, demister is connected below taper exhanst gas outlet, 500mm place below demister, the uniform pore openings being provided with uniform pore openings mode carries effect screen, it is spraying layer that uniform pore openings is carried below effect screen, spraying layer is divided into ground floor spraying layer, second layer spraying layer and third layer spraying layer, 1.5m place below ground floor spraying layer, effect screen is carried in the non-homogeneous perforate being provided with limit wall non-homogeneous perforate layout, be provided with the non-homogeneous perforate of left and right sides being provided with left and right sides non-homogeneous perforate layout below third layer spraying layer and carry effect screen, carry below effect screen is flue entrance, stock tank is provided with below flue entrance, oxidation furnaces is provided with in the middle part of stock tank, stock tank one side lower part is provided with mixing pump.
As the further improvement of above-mentioned technology, described in carry effect screen and comprise screen and hold liquid baffle plate, the percent opening of screen is 20% ~ 70%; Holding liquid baffle plate is 100 ~ 500mm, and holding liquid height is 0 ~ 500mm.
As the further improvement of above-mentioned technology, described screen perforate mode is grid seam or gate hole, and grid seam is welded by flat steel bar, and the width of grid seam is for being not less than 15mm, and length is not less than 40mm, and seam end spacing is not less than 10mm, and grid seam diameter is not less than 15mm; Gate hole is the strip typed gap gone out by steel plate.
As the further improvement of above-mentioned technology, described screen reinforcing mode comprises and uses gusset or brace summer to carry out the mode of reinforcing.
As the further improvement of above-mentioned technology, described in carry effect screen and adopt the high material of anti-wear corrosion-resistant intensity to make, make material and include but not limited to alloy or fiberglass or FRP material.
As the further improvement of above-mentioned technology, described effect screen of carrying is arranged on above smoke inlet and is not less than 500mm in tower body, 1.5m place is not less than below ground floor spraying layer, at least one deck is installed, putting forward effect screen perforate mode is uniform pore openings, or be non-homogeneous perforate mode, non-homogeneous perforate mode for away from flue entrance regional opening rate closeer be 20% ~ 40%, near flue entrance regional opening rate, comparatively to dredge be 40% ~ 70%.
Compared with prior art, the invention has the beneficial effects as follows: the function 1, carrying effect screen is to adopt grid to stitch or gate hole perforate, and percent opening scope can be 20% ~ 70%, can adapt to desulfurizer entrance sulfur dioxide concentration for being not more than 6000mg/Nm 3, dust concentration is not more than 100mg/Nm 3flue gas, operating flexibility is strong; 2, adopt suitable flow field perforate mode, namely carry out perforate according to Flow Field Distribution otherness, VELOCITY DISTRIBUTION in uniform tower can be forced to be not more than 15% to speed dispersion deviation, especially can eliminate bias current or the high velocity of tower wall; 3, this device can carry the slurries amount of 0 ~ 500mm, can increase the slurries time of staying being not less than 2S, improves the rate of dissolution of absorbent, thus reduces liquid-gas ratio, reduces power consumption; 4, accelerate when this device can make flue gas be stitched by grid, energy Forced Dispersion slurries, make slurries form high speed droplet, the turbulence of strengthening gas-liquid, and improve gas liquid interfacial area, desulfuration efficiency is 97% ~ 99%; The inertial collision kinetic energy of gas-solid contact area and gas-solid contact can be improved, improve efficiency of dust collection, PM2.5 removal efficiency especially can be made to reach 60% ~ 100%; 5, this device can be applicable to sulfur dioxide and is less than 35mg/Nm 3, flue dust is less than 5mg/Nm 3minimum discharge project newly-built or transformation, the fields such as coal-burning power plant, Industrial Boiler, chemical industry can be applicable to.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is that of the present invention carrying imitates screen 3 d effect graph A;
Fig. 3 is that of the present invention carrying imitates screen 3 d effect graph B;
Fig. 4 is that effect screen grid of carrying of the present invention stitch perforate mode schematic diagram;
Fig. 5 is that of the present invention carrying imitates screen gate hole perforate mode schematic diagram;
Fig. 6 is the left and right sides non-homogeneous perforate layout schematic diagram that effect screen is carried in the non-homogeneous perforate of left and right sides of the present invention;
Fig. 7 is the limit wall non-homogeneous perforate layout schematic diagram that effect screen is carried in non-homogeneous perforate of the present invention;
Fig. 8 is the uniform pore openings layout schematic diagram that uniform pore openings of the present invention carries effect screen.
In accompanying drawing, 1-exhanst gas outlet; 2-demister; 3-uniform pore openings carries effect screen; 4-spraying layer; Effect screen is carried in the non-homogeneous perforate of wall of 5-limit; Effect screen is carried in the non-homogeneous perforate of 6-left and right sides; 7-smoke inlet; 8-stock tank; 9-oxidation furnaces; 10-mixing pump, 11-carry effect screen.
Detailed description of the invention
Be described in more detail below in conjunction with the technical scheme of detailed description of the invention to this patent.
As shown in Figure 1, the wet desulphurization device of effect screen carried by a kind of band, comprise tower body, tower body adopts hollow-spraying-tower desulfurizing tower, tower body is provided with taper exhanst gas outlet 1, demister 2, spraying layer 4, smoke inlet 7, stock tank 8, oxidation furnaces 9 and mixing pump 10, demister 2 is connected below taper exhanst gas outlet 1, 500mm place below demister 2, the uniform pore openings being provided with uniform pore openings mode carries effect screen 3, it is spraying layer 4 that uniform pore openings is carried below effect screen 3, spraying layer 4 is divided into ground floor spraying layer, second layer spraying layer and third layer spraying layer, 1.5m place below ground floor spraying layer, effect screen 5 is carried in the non-homogeneous perforate being provided with limit wall non-homogeneous perforate layout, be provided with the non-homogeneous perforate of left and right sides being provided with left and right sides non-homogeneous perforate layout below third layer spraying layer and carry effect screen 6, it is flue entrance 7 that the non-homogeneous perforate of left and right sides is carried below effect screen 6, stock tank 8 is provided with below flue entrance 7, oxidation furnaces 9 is provided with in the middle part of stock tank 8, stock tank 8 one side lower part is provided with mixing pump 10, wherein, uniform pore openings carries effect screen 3, non-homogeneous perforate carry effect screen 5 and the non-homogeneous perforate of left and right sides carry effect screen 6 groups form carry effect screen 11.
When the present invention works, the former flue gas being not less than 85 DEG C through dedusting is entered by the flue entrance 7 of desulfurizer, bottom-up motion in desulfurizer, for absorbing sulfur dioxide in flue, the slurries of trapping flue dust are by spraying layer 4, from up to down spray, contact with former flue gas adverse current, the slurries that effect screen 6 can carry 0 ~ 500mm are carried in the non-homogeneous perforate of left and right sides of left and right sides non-homogeneous perforate mode, former flue gas puies forward grid seam or the gate hole of effect screen 6 through the non-homogeneous perforate of left and right sides, velocity of flue gas uprises, slurries now can be made to evoke a large amount of drop and form vacuole, on the one hand less drop moves upward along with flue gas, form jetted layers, jetting height is generally not less than 1m, heavier drop is fallen on screen on the other hand, in the process, slurries define the droplet with certain speed, increase the tubulence energy of flue gas and slurry liquid contacts, improve gas liquid interfacial area, increase desulfuration efficiency, the droplet formed and vacuole, improve the inertial collision kinetic energy of gas-solid contact area and gas-solid contact, efficiency of dust collection can be improved simultaneously, especially the soot dust granule of PM2.5, the single flue inlet induction flow field deviation of imitating screen 6 and can adapt to this desulfurizer is put forward in the non-homogeneous perforate of left and right sides of the non-homogeneous perforate of left and right sides, after making former flue gas carry effect screen 6 by the non-homogeneous perforate of left and right sides, in tower, the velocity of flue gas discrete discrepancy value in cross section is less than 15%, contact to ensure that uniform flue gas mates with the slurries of spraying layer 4, flue gas continues to move up through the non-homogeneous perforate that spraying layer 4 arrives the non-homogeneous perforate of limit wall and carries effect screen 5, this device adopts the non-homogeneous perforate mode of limit wall, can by large for limit wall flow velocity, carry slurries amount height flue gas to gather to center, escape to prevent pollutant limit wall, the time of staying that also can increase slurries is not less than 2S, and the slurries pH of sulfur dioxide absorption is not more than 4.5, is conducive to the dissolution rate improving absorbent, thus can absorbs more sulfur dioxide under equal liquid-gas ratio, thus reduce liquid-gas ratio, reduce power consumption.Flue gas continues to move upward by spraying layer 4 after slurry wash, the uniform pore openings arriving uniform pore openings mode carries effect screen 3, this device can be forced evenly because of the flue gas flow field after flue gas and drop strong disturbance, flue gas is by after this device, in tower, the velocity of flue gas discrete discrepancy in cross section can be less than 15%, meet the incident field requirements of demister, be conducive to demister 2 to play and maximum go drop ability, to ensure that the drop 95% of more than 22 microns is removed, the flue gas carrying amount that desulfurizer is exported is less than 30mg/Nm3.Discharged from taper flue outlet 1 by the flue gas after purification, taper exhanst gas outlet 1 effectively can slow down the flow field bias current that 90 ° of elbows produce, to slow down the impact of flue outlet on demister flow field.
As shown in Figure 2,3, 4, the percent opening of screen is 20% ~ 70%, and holding liquid baffle plate is 100 ~ 500mm, and holding liquid height is 0 ~ 500mm.Described screen perforate mode can be grid seam, and grid seam is welded by flat steel bar.The width of grid seam is for being not less than 15mm, and length is not less than 40, and seam end spacing is not less than 10mm.Described screen perforate mode can be gate hole, and gate hole goes out strip typed gap by steel plate stamping, and the width of grid seam is not less than 15mm, and length is not less than 40, and seam end spacing is not less than 10mm, and grid seam diameter is not less than 15mm.
As shown in Figure 5, effect screen 6 is carried in the non-homogeneous perforate of left and right sides for left and right sides non-homogeneous perforate mode, away from flue entrance regional opening rate closeer be 20% ~ 40%, near flue entrance regional opening rate, comparatively to dredge be 40% ~ 70%; Effectively can be removed smoke bias current benefit, discrete slurries, strengthening tubulence energy, strengthening mass transfer, heat transfer.
As shown in Figure 6, effect screen 5 is carried in the non-homogeneous perforate for the non-homogeneous perforate in Bian Bi side mode, away from flue entrance regional opening rate closeer be 20% ~ 40%, near flue entrance regional opening rate, comparatively to dredge be 40% ~ 70%.The slurries time of staying can be increased, effectively can eliminate limit wall deflection flow effect, substitute gas gathering ring effect.
As shown in Figure 7, be uniform pore openings mode, percent opening 50% ~ 70%; Cross section speed dispersion deviation in uniform tower can be forced to be less than 15%.
The non-homogeneous perforate of left and right sides is carried effect screen 6 and is adopted the material of acid-resistant anti-corrosion to make, and owing to adopting quality material, has acid resistance, anticorrosive property, avoids the generation of widget origination point corrosion phenomenon in the past.
Smoke inlet sulfur dioxide concentration for being not more than 6000mg/Nm3, dust concentration is not more than 100mg/Nm3, inlet flue gas temperature 90 ~ 120 DEG C, desulfurizer adopts three layers to carry effect screen, 4 layers of spraying layer, three grades of ridge type demisters 2, liquid-gas ratio is not more than 15L/m3, and in tower, flow velocity is not more than 4m/s, resistance is not more than 2500Pa, and sulfur dioxide concentration is not more than 35mg/Nm3, flue dust is not more than 5mg/Nm3 in desulfurizer outlet.
The foregoing is only preferred embodiment of the present invention; not thereby embodiments of the present invention and protection domain is limited; to those skilled in the art; the equivalent replacement that all utilizations description of the present invention and diagramatic content are made and the scheme that apparent change obtains should be recognized, all should be included in protection scope of the present invention.

Claims (6)

1. the wet desulphurization device of imitating screen carried by a band, comprise tower body, tower body adopts hollow-spraying-tower desulfurizing tower, tower body is provided with taper exhanst gas outlet, demister, spraying layer, smoke inlet, stock tank, oxidation furnaces and mixing pump, it is characterized in that, demister is provided with below taper exhanst gas outlet, 500mm place below demister, the uniform pore openings being provided with uniform pore openings mode carries effect screen, it is spraying layer that uniform pore openings is carried below effect screen, spraying layer is divided into ground floor spraying layer, second layer spraying layer and third layer spraying layer, 1.5m place below ground floor spraying layer, effect screen is carried in the non-homogeneous perforate being provided with limit wall non-homogeneous perforate layout, be provided with the non-homogeneous perforate of left and right sides being provided with left and right sides non-homogeneous perforate layout below third layer spraying layer and carry effect screen, carry below effect screen is flue entrance, stock tank is provided with below flue entrance, oxidation furnaces is provided with in the middle part of stock tank, stock tank one side lower part is provided with mixing pump.
2. the desulfurizer of effect screen carried by the band as shown in claim 1, it is characterized in that, described in carry effect screen and comprise screen and hold liquid baffle plate, the percent opening of screen is 20% ~ 70%; Holding liquid baffle plate is 100 ~ 500mm, and holding liquid height is 0 ~ 500mm.
3. the wet desulphurization device of effect screen carried by band according to claim 1, it is characterized in that, described screen perforate mode is grid seam or gate hole, grid seam is welded by flat steel bar, the width of grid seam is for being not less than 15mm, length is not less than 40mm, and seam end spacing is not less than 10mm, and grid seam diameter is not less than 15mm; Gate hole is the strip typed gap gone out by steel plate.
4. the wet desulphurization device of effect screen carried by band according to claim 1, it is characterized in that, described screen reinforcing mode comprises and uses gusset or brace summer to carry out the mode of reinforcing.
5. the wet desulphurization device of effect screen carried by band according to claim 1, it is characterized in that, described in carry effect screen and adopt the high material of anti-wear corrosion-resistant intensity to make, make material and include but not limited to alloy or fiberglass or FRP material.
6. the wet desulphurization device of effect screen carried by band according to claim 1, it is characterized in that, described effect screen of carrying is arranged on above smoke inlet and is not less than 500mm in tower body, 1.5m place is not less than below ground floor spraying layer, at least install one deck, putting forward effect screen perforate mode is uniform pore openings, or is non-homogeneous perforate mode, non-homogeneous perforate mode for away from flue entrance regional opening rate closeer be 20% ~ 40%, near flue entrance regional opening rate, comparatively to dredge be 40% ~ 70%.
CN201510571913.3A 2015-09-10 2015-09-10 Wet desulphurization device with effect-raising grating plate Pending CN105169924A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106622660A (en) * 2016-12-27 2017-05-10 北京国能中电节能环保技术股份有限公司 Side outlet type wet electrostatic precipitator
CN108114578A (en) * 2017-12-20 2018-06-05 华中科技大学 A kind of purifier for biomass pyrolysis liquefaction Poly-generation

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CN104785084A (en) * 2015-03-17 2015-07-22 浙江大学 Mass transfer enhancing high-efficiency desulfurization absorption tower
CN204582914U (en) * 2015-05-07 2015-08-26 武汉凯迪电力环保有限公司 The gas-liquid distributor that a kind of non-homogeneous perforate is arranged
CN204601981U (en) * 2015-05-18 2015-09-02 武汉凯迪电力环保有限公司 A kind of desulfurizing tower of configuring multi-layer pallet
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106622660A (en) * 2016-12-27 2017-05-10 北京国能中电节能环保技术股份有限公司 Side outlet type wet electrostatic precipitator
CN106622660B (en) * 2016-12-27 2018-07-24 北京国能中电节能环保技术股份有限公司 A kind of side outlet type wet electrical dust precipitator
CN108114578A (en) * 2017-12-20 2018-06-05 华中科技大学 A kind of purifier for biomass pyrolysis liquefaction Poly-generation

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