CN212369922U - Device for deeply removing sulfur dioxide in flue gas and efficiently removing gaseous heavy metal selenium - Google Patents

Device for deeply removing sulfur dioxide in flue gas and efficiently removing gaseous heavy metal selenium Download PDF

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CN212369922U
CN212369922U CN202020917675.3U CN202020917675U CN212369922U CN 212369922 U CN212369922 U CN 212369922U CN 202020917675 U CN202020917675 U CN 202020917675U CN 212369922 U CN212369922 U CN 212369922U
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oxidation
slurry
ozone
flue gas
generating device
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吴敏
韩长民
陈超
薛菲
张轶
邹佳佳
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WUHAN KAIDI ELECTRIC POWER ENVIRONMENTAL CO Ltd
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WUHAN KAIDI ELECTRIC POWER ENVIRONMENTAL CO Ltd
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Abstract

The utility model relates to a device of high-efficient desorption of sulfur dioxide degree of depth desorption in coordination with gaseous state heavy metal selenium in flue gas, including desulfurizing tower, circulating pump, ozone generating device, oxidation fan, limestone slurry preparation facilities and pH controlling means, ozone generating device is used for generating strong oxide matter ozone, and oxidation fan is usedBlowing air, mixing the ozone generated by the ozone generating device with the air blown by the oxidation fan to form a forced oxidation gas, inputting the forced oxidation gas into the oxidation slurry pool, and supplementing the limestone slurry preparation device into the oxidation slurry pool for absorbing SO2And SeO2The limestone slurry of (1); the pH control device is used for measuring the pH value of the slurry in the oxidation slurry tank, feeding back the pH value to the adjusting control loop to adjust the limestone slurry supply amount of the limestone slurry preparation device, and controlling the slurry in the oxidation slurry tank to operate within the range of pH 5.4-6.4. The utility model discloses a desulphurization unit is to gaseous state heavy metal Se's high-efficient desorption in coordination, realizes that the process is not only simple but also economic, and convenient operation.

Description

Device for deeply removing sulfur dioxide in flue gas and efficiently removing gaseous heavy metal selenium
Technical Field
The utility model relates to an atmospheric pollutants prevents and treats technical field, concretely relates to degree of depth desulfurization and heavy metal desorption device.
Background
Coal is the safest, most economic and most reliable energy in China, and the primary energy consumption in China is more than six. However, due to the complex composition of the coal, a large amount of sulfur dioxide (SO) is generated in the combustion process2) And conventional pollutants such As nitrogen oxides and smoke dust, and trace heavy metals such As mercury (Hg), selenium (Se), arsenic (As) and the like can also migrate into the smoke in the form of gas or particle, so that a serious environmental pollution problem is caused. In the face of the severe environmental form of China, China gradually puts forward a policy of ultralow emission of flue gas in the power industry and the non-power industries such as steel, nonferrous metal, building materials and the like, and strengthens the treatment of the conventional pollutant SO2Control of nitrogen oxides and soot, etc. Meanwhile, the nation also goes out policies such as 'twelve five-element' planning for comprehensive prevention and treatment of heavy metal pollution and the like to strengthen the deployment of the prevention and treatment work of heavy metal pollution. Therefore, the desulfurization device is used as the terminal equipment of the traditional flue gas pollutant treatment process and is used for treating SO2The requirement on the removal efficiency is higher and higher, and the improvement of the synergistic removal efficiency of part of heavy metals also attracts more and more attention.
The current flue gas desulfurization technology still uses limestone-gypsum wet process asMainly, the occupancy rate of the method in the flue gas treatment market of China is more than 85 percent, and the main technical principle is to utilize cheap limestone slurry to absorb SO2The absorption reaction product mainly contains sulfite (including bisulfite), then the sulfite is oxidized into sulfate, and finally the byproduct (gypsum) is recycled through processes such as crystallization purification and the like. For the process principle, a higher pH value is required in the absorption zone to favor SO2Absorption requires a lower pH in the oxidation zone to facilitate oxidation of the sulfite. Due to the use for absorbing SO2The slurry and the slurry for oxidation are communicated with each other, so that the purity of the desulfurization by-product (gypsum) is ensured by taking absorption and oxidation effects into consideration, and the highest pH value of the slurry in the traditional process is 5.4-5.8. The method for improving the desulfurization efficiency of the limestone-gypsum wet process mainly comprises the following steps:
1) the retention time of the flue gas in the absorption area can be increased by adding the series towers and the like. The utility model discloses a two tower dual cycle lime stone wet flue gas desulfurization device and method as utility model patent application number 201210423242.2, through setting up the two-stage absorption tower series arrangement, increase the dwell time of absorption reaction. But the double-tower arrangement not only increases the occupied land, but also has higher investment cost, operating cost and the like than the single-tower desulfurization technology.
2) The gas-liquid distribution in the tower is optimized, the nozzle performance is improved, and the like, so that the gas-liquid mass transfer effect is enhanced. The utility model discloses a revolve the collection coupling ultra-clean desulfurization dust removal integrated system and desulfurization dust removal method thereof as utility model patent application number 201580016531.2, through setting up one deck and revolve the collection coupling device, strengthen the gas-liquid contact. However, the method improves the running resistance of the desulfurization device, and does not improve the pH value of the desulfurization slurry in the running process, namely SO2The mass transfer resistance is not reduced in terms of absorption angle, and the deep desulfurization efficiency is limited.
3) The pH value of the absorption zone is locally improved in a zone control mode, the pH value of the oxidation zone is not increased, the mass transfer driving force of the absorption reaction can be increased under the condition of ensuring the oxidation effect of the sulfite theoretically, the reaction rate and the desulfurization efficiency are improved, and the high-concentration SO is realized2Deep removal under the conditions. A new one as disclosed in the utility model patent application No. 20161126274.9The single-tower double-zone desulfurization system is characterized in that an absorption zone and an oxidation zone are separated by a partitioning mechanism, so that the higher pH value of the absorption zone and the lower pH value of the oxidation zone are realized; in the single-tower double-circulation desulfurization system disclosed in U.S. patent application No. US4351804, the desulfurization tower is divided into two sections of independently circulating absorption processes by a collecting bowl, the pH value of a first-stage absorption region is lower, and the pH value of a second-stage absorption region is higher; the high-efficiency gradual-change grading composite desulfurizing tower disclosed in the U.S. patent application with the application number of US10143957B2 realizes the tail end SO by arranging a thin film liquid holding layer of high-pH slurry above a spraying layer2And (4) fine removal. However, the increase of the local pH value not only increases the complexity of the device, which results in increased design difficulty and operation cost of the system, but also increases the modification cost and modification period required by the device, and also increases the risk of deposition and scaling in the local high pH region.
Although the above patent does not emphasize the effect of the wet desulphurization device on removing heavy metals, because the heavy metals enrichment degree in the smoke is higher, the desulphurization device has a certain capability of removing particulate heavy metals while removing dust cooperatively through the functions of spraying and washing the smoke with the slurry and inertial capture of the demister on liquid drops. The utility model discloses a rotary-converging coupling ultra-clean desulfurization dust removal integrated system and desulfurization dust removal method thereof as application number 201580016531.2 improves desulphurization unit's dust collection efficiency in coordination through setting up the tube bank formula dust collector who includes a plurality of dust removal defogging units to can realize the desorption to some particulate state heavy metals. However, according to the literature study of Xu (Xu M, et al. status of trace element emission in a co-distributed process: A review [ J. M.)]Fuel Processing Technology,2004,85(2):215-2Migrate into the flue gas. SeO2The solubility in water is low, so the existing desulphurization device has low efficiency for removing the gaseous heavy metal Se in the flue gas. In the published patents and papers, no better method is available for realizing the efficient and synergistic removal of gaseous heavy metal Se by a desulfurization device.
SUMMERY OF THE UTILITY MODEL
The utility modelAiming at the defects of the prior art, the technical problem to be solved is to provide SO in flue gas2A device for deeply removing and efficiently removing the cooperative gaseous heavy metal Se aims to optimize the operating conditions of the existing desulfurization process, improve the desulfurization efficiency, optimize the forced oxidation method of the existing desulfurization process and remove the Se in slurry4+Conversion to more soluble Se6+The device and the method have the advantages that the absorption capacity of slurry in the desulfurizing tower to Se is improved, the efficient and synergistic removal of gaseous heavy metal Se by the desulfurizing device is realized, and the device and the method are simple and economic in realization process and convenient to operate.
The utility model discloses a solve the technical scheme that technical problem that the aforesaid provided adopted and be:
a device for deeply removing sulfur dioxide in flue gas and efficiently removing gaseous heavy metal selenium, which comprises a desulfurizing tower and a circulating pump arranged outside the desulfurizing tower, the bottom of the desulfurization tower is provided with an oxidation slurry tank, the upper part of the desulfurization tower is provided with a spray layer, a flue gas inlet is arranged between the oxidation slurry tank and the spray layer, the circulating pump conveys slurry in the oxidation slurry tank to the spray layer, the device also comprises an ozone generating device, an oxidation fan, a limestone slurry preparation device and a pH control device, the ozone generating device is used for generating strong oxide ozone, the oxidation fan is used for blowing air, the ozone generated by the ozone generating device is mixed with the air blown by the oxidation fan to form forced oxidation gas, and the forced oxidizing gas is input into the oxidizing pulp tank, and the limestone pulp preparation device is used for supplementing SO into the oxidizing pulp tank.2And SeO2The limestone slurry of (1); the pH control device is used for measuring the pH value of the slurry in the oxidation slurry pool, feeding back the pH value to the adjusting control loop to adjust the limestone slurry supply amount of the limestone slurry preparation device, and controlling the slurry in the oxidation slurry pool to operate within the range of pH 5.4-6.4.
In the scheme, the device further comprises a discharge pump, wherein the discharge pump is communicated with the oxidation slurry tank and is used for intermittently discharging the gypsum and the desulfurization wastewater generated in the oxidation slurry tank.
In the above scheme, the device further comprises a stirrer, wherein the stirrer is arranged in the oxidation slurry pool and used for stirring the slurry in the oxidation slurry pool, and the slurry and the forced oxidation gas are uniformly mixed.
In the scheme, the ozone generating device and the oxidation fan are arranged in parallel, and the ozone generating device generates ozone by using an independent oxygen source and then mixes the ozone with air blown by the oxidation fan; the sole source of oxygen is air or pure oxygen.
In the above scheme, the ozone generating device and the oxidation fan are arranged in series, the ozone generating device is arranged between the oxidation fan and the desulfurizing tower, and air blown by the oxidation fan is directly used as an oxygen source of the ozone generating device, so that the volume concentration of ozone in the mixed gas reaches 1-2%.
The beneficial effects of the utility model reside in that:
(1) the operation is stable and reliable: the strong oxidizing substance ozone is introduced, so that the oxidation process of the sulfite is strengthened, the oxidation speed is high even under the higher pH operation condition, the oxidation rate can reach more than 95 percent, enough gypsum varieties in the slurry are ensured to be used for crystal growth, the scaling can be prevented, the device runs stably for a long time, and the scaling risk is small.
(2) The desulfurization efficiency is high: the pH value of the operation of the desulfurization system is integrally improved, and SO is increased2And absorbing mass transfer driving force between slurry, and the desulfurization efficiency can reach more than 99%.
(3) The efficiency of removing gaseous Se cooperatively is high: SeO which is difficult to be further oxidized under the conventional air oxidation conditions due to the introduction of a strong oxidant3 2-Oxidation to more soluble SeO4 2-Greatly improves the further absorption of SeO by the slurry2The ability of the cell to perform. At the same time, the slurry with higher pH value is also beneficial to acidic gaseous SeO2Absorption of (2). The efficiency of the desulphurization device for removing the gaseous Se can reach more than 90 percent.
(4) The realization process is simple and economic, and the operation is convenient: compared with the traditional wet desulphurization process, the utility model discloses hardly change desulfurizing tower body structural design, very easily install and be under construction, the design degree of difficulty is little.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic structural diagram of a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second embodiment of the present invention.
In the figure: 1. air; 2. an oxidation fan; 3. an ozone generating device; 4. forced oxidizing gas; 5. an oxidation slurry pond; 6. a stirrer; 7. a pH control device; 8. a limestone slurry preparation device; 9. a circulation pump; 10. a spray layer; 11. a flue gas inlet; 12. a discharge pump; 13. a desulfurizing tower.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The first embodiment:
fig. 1 is a process flow diagram of a first embodiment of the method and the device for deep removal of sulfur dioxide in flue gas and efficient removal of gaseous heavy metal selenium. In the embodiment, a 600MW coal-fired unit is taken as an example, a desulfurization process flow with the sulfur content of the coal being 2.3% is taken as an example, and the gas flow at the flue gas inlet is 2200000Nm3/h,SO2The concentration is 5200mg/Nm3
The device of the utility model comprises a desulfurizing tower 13, an oxidation slurry pool 5, a spraying layer 10, a circulating pump 9, an ozone generating device 3, an oxidation fan 2, a limestone slurry preparation device 8, a pH control device 7 and a discharge pump 12. The oxidation thick liquid pond 5 sets up in desulfurizing tower 13 bottom, sprays the layer 10 and sets up in desulfurizing tower 13 upper portion, sets up flue gas entry 11 between oxidation thick liquid pond 5 and the layer 10 that sprays, and circulating pump 9 sets up in desulfurizing tower 13 outsidely for carry the thick liquid in the oxidation thick liquid pond 5 to spraying layer 10. An ozone generating device 3 for generating strong oxide ozone, an oxidation fan 2 for blowing air 1, and an ozone generating device 3 arranged in parallel with the oxidation fan 2 for blowing 25000Nm of ozone from the oxidation fan 23/h air and ozone generating device625kg/h ozone generated by the 3 is mixed to form forced oxidation gas 4 which is rapidly input into the oxidation slurry pool 5. A stirrer 6 is arranged in the oxidation pulp tank 5, under the action of the stirrer 6, the oxidation gas 4 is forced to be intensively mixed with the pulp in the oxidation pulp tank 5, a large amount of calcium sulfite contained in the pulp in the oxidation pulp tank 5 is oxidized into calcium sulfate, and meanwhile, part of SeO in the pulp in the oxidation pulp tank 5 is enabled to be3 2-Oxidation to more soluble SeO4 2-. The calcium sulfate can further crystallize into gypsum particles, which are intermittently discharged by the discharge pump 12.
The limestone slurry preparation device 8 is used for supplementing SO into the oxidation slurry pool 5 for absorbing SO2And SeO2The limestone slurry of (1). And the pH value of the slurry in the oxidation slurry pool 5 is measured through the pH control device 7, and the pH value is fed back to the adjusting control loop to adjust the limestone slurry supply amount of the limestone slurry preparation device 8, so that the pH value of the slurry in the oxidation slurry pool 5 is controlled to operate within the range of pH 5.8-6.4. The limestone slurry preparation device 8 is a common device in the wet desulphurization process, and is a system consisting of conveying, unloading, in-plant transportation, preparation and storage equipment. The pH control device 7 is a common device in the wet desulphurization process, and the slurry feeding amount of the limestone slurry is controlled by feeding back the pH value to a pH value adjusting loop after the pH value of the slurry is measured by a pH value sensor.
The slurry in the oxidation slurry tank 5 is conveyed to a spraying layer 10 through a circulating pump 9, a plurality of nozzles are arranged in the spraying layer 10, and the slurry sprayed by the spraying layer 10 absorbs SO in the flue gas2And SeO2Post-production of sulfite and SeO3 2-And the absorbed slurry falls back to the oxidized slurry under the action of gravity.
As the slurry sprayed by the spraying layer 10 can also absorb HCl gas in the flue gas, Cl is generated in the slurry in the recycling process-The concentration is continuously increased when Cl is oxidized in the slurry tank 5-When the concentration exceeds the anti-corrosion design requirement of the inner layer of the desulfurizing tower 13, the high Cl in the oxidation slurry pool 5 is intermittently discharged by a discharge pump 12-And discharging the concentrated slurry.
The method for deeply removing sulfur dioxide in flue gas and efficiently removing gaseous heavy metal selenium by using the device in the embodiment comprises the following steps:
s1, generating ozone with high oxidizability by using an ozone generating device 3, mixing the ozone and oxidizing air, and introducing the mixture into a slurry oxidizing area at the bottom of a desulfurizing tower 13, wherein the ozone and the oxidizing air adopt a parallel mixing method, namely, an independent oxygen source (air or pure oxygen) is adopted to generate the ozone and then the ozone is mixed with the oxidizing air; the ozone and the oxidizing air are fully mixed with the slurry at the bottom of the desulfurizing tower 13 under the action of the stirrer 6, so that a large amount of calcium sulfite in the slurry at the bottom of the desulfurizing tower 13 is oxidized into calcium sulfate, and part of SeO in the slurry at the bottom of the desulfurizing tower 13 is simultaneously oxidized into calcium sulfate3 2-Oxidation to more soluble SeO4 2-Thereby improving the re-absorption of the gaseous SeO by the slurry2The ability of the cell to perform. The generated calcium sulfate is further crystallized into gypsum particles to be discharged.
S2, adding enough fresh limestone slurry into the slurry at the bottom of the desulfurizing tower 13, and controlling the pH value of the slurry in the oxidizing slurry pool 5 to operate within the range of pH 5.8-6.4. The pH value range of the slurry in the oxidation slurry tank 5 is adjusted according to the desulfurization efficiency and the degassing state Se efficiency, and the higher the desulfurization efficiency and the degassing state Se efficiency is, the higher the pH value requirement is.
And S3, pumping the slurry at the bottom of the desulfurizing tower 13 into the spraying layer 10 through the circulating pump 9, spraying through the nozzles to form spraying slurry, and enabling the spraying slurry to flow from top to bottom under the action of gravity and fall back to the slurry oxidation area at the bottom of the desulfurizing tower 13 again for recycling. The spraying slurry has higher pH value, SO that SO can be increased2Absorbing the mass transfer driving force between the slurry and improving the desulfurization efficiency; at the same time, the slurry with higher pH value is also beneficial to acidic gaseous SeO2Absorption of (2).
S4, the flue gas enters the desulfurizing tower 13 from the middle of the slurry oxidation area at the bottom of the desulfurizing tower 13 and the spraying layer 10, flows from bottom to top in the desulfurizing tower 13 and is in countercurrent contact with the spraying slurry, and SO in the flue gas2And gaseous SeO2Will be absorbed and purified by the spraying slurry.
Second embodiment:
FIG. 2 shows that the deep removal of sulfur dioxide in flue gas is cooperated with the high-efficiency removal of gaseous heavy metal seleniumProcess flow diagram of the second embodiment of the method and apparatus. In the embodiment, a 600MW coal-fired unit is taken as an example, a desulfurization process flow with the sulfur content of the coal being 2.3% is taken as an example, and the gas flow at a flue gas inlet 11 is 2200000Nm3/h,SO2The concentration is 5200mg/Nm3
The device of the utility model comprises a desulfurizing tower 13, an oxidation slurry pool 5, a spraying layer 10, a circulating pump 9, an ozone generating device 3, an oxidation fan 2, a limestone slurry preparation device 8, a pH control device 7 and a discharge pump 12. The oxidation thick liquid pond 5 sets up in desulfurizing tower 13 bottom, sprays the layer 10 and sets up in desulfurizing tower 13 upper portion, sets up flue gas entry 11 between oxidation thick liquid pond 5 and the layer 10 that sprays, and circulating pump 9 sets up in desulfurizing tower 13 outsidely for carry the thick liquid in the oxidation thick liquid pond 5 to spraying layer 10. Ozone generating device 3 is used for generating strong oxide matter ozone, oxidation fan 2 is used for blowing in air 1, ozone generating device 3 and oxidation fan 2 are arranged in series, ozone generating device 3 sets up between oxidation fan 2 and desulfurizing tower 13, blows 25000Nm through oxidation fan 23Air per hour, and using the air as an oxygen source of the ozone generator 3, a forced oxidation gas 4 containing 625 kg/hour ozone is generated, and the forced oxidation gas 4 is rapidly fed into the oxidation slurry tank 5. A stirrer 6 is arranged in the oxidation pulp tank 5, under the action of the stirrer 6, the oxidation gas 4 is forced to be intensively mixed with the pulp in the oxidation pulp tank 5, a large amount of calcium sulfite contained in the pulp in the oxidation pulp tank 5 is oxidized into calcium sulfate, and meanwhile, part of SeO in the pulp in the oxidation pulp tank 5 is enabled to be3 2-Oxidation to more soluble SeO4 2-. The calcium sulfate can further crystallize into gypsum particles, which are intermittently discharged by the discharge pump 12.
The limestone slurry preparation device 8 is used for supplementing SO into the oxidation slurry pool 5 for absorbing SO2And SeO2The limestone slurry of (1). And the pH value of the slurry in the oxidation slurry pool 5 is measured through the pH control device 7, and the pH value is fed back to the adjusting control loop to adjust the limestone slurry supply amount of the limestone slurry preparation device 8, so that the pH value of the slurry in the oxidation slurry pool 5 is controlled to operate within the range of pH 5.8-6.4.
The slurry in the oxidation slurry tank 5 is conveyed to a spraying layer 10 through a circulating pump 9, and the spraying layer 10 is internally arrangedThe spraying layer 10 sprays the slurry to absorb SO in the flue gas by a plurality of nozzles2And SeO2Post-production of sulfite and SeO3 2-And the absorbed slurry falls back to the oxidized slurry under the action of gravity.
As the slurry sprayed by the spraying layer 10 can also absorb HCl gas in the flue gas, Cl is generated in the slurry in the recycling process-The concentration is continuously increased when Cl is oxidized in the slurry tank 5-When the concentration exceeds the anti-corrosion design requirement of the inner layer of the desulfurizing tower 13, the high Cl in the oxidation slurry pool 5 is intermittently discharged by a discharge pump 12-And discharging the concentrated slurry.
The method for deeply removing sulfur dioxide in flue gas and efficiently removing gaseous heavy metal selenium by using the device in the embodiment comprises the following steps:
s1, generating ozone with high oxidizability by using the ozone generating device 3, mixing the ozone with oxidizing air, and introducing the mixture into a slurry oxidation area at the bottom of the desulfurizing tower 13, wherein the ozone and the oxidizing air adopt a series mixing method, namely the oxidizing air is used as an oxygen source of the ozone generating device 3, so that the volume concentration of the ozone in the mixed gas reaches 1-2%; the ozone and the oxidizing air are fully mixed with the slurry at the bottom of the desulfurizing tower 13 under the action of the stirrer 6, so that a large amount of calcium sulfite in the slurry at the bottom of the desulfurizing tower 13 is oxidized into calcium sulfate, and part of SeO in the slurry at the bottom of the desulfurizing tower 13 is simultaneously oxidized into calcium sulfate3 2-Oxidation to more soluble SeO4 2-Thereby improving the re-absorption of the gaseous SeO by the slurry2The ability of the cell to perform. The generated calcium sulfate is further crystallized into gypsum particles to be discharged.
S2, adding enough fresh limestone slurry into the slurry at the bottom of the desulfurizing tower 13, and controlling the pH value of the slurry in the oxidizing slurry pool 5 to operate within the range of pH 5.8-6.4. The pH value range of the slurry in the oxidation slurry tank 5 is adjusted according to the desulfurization efficiency and the degassing state Se efficiency, and the higher the desulfurization efficiency and the degassing state Se efficiency is, the higher the pH value requirement is.
S3, pumping the slurry at the bottom of the desulfurizing tower 13 into the spraying layer 10 through the circulating pump 9, spraying through the nozzle to form spraying slurry, wherein the spraying slurry is self-upward due to the gravity actionThe lower flow falls back to the slurry oxidation area at the bottom of the desulfurizing tower 13 for recycling. The spraying slurry has higher pH value, SO that SO can be increased2Absorbing the mass transfer driving force between the slurry and improving the desulfurization efficiency; at the same time, the slurry with higher pH value is also beneficial to acidic gaseous SeO2Absorption of (2).
S4, the flue gas enters the desulfurizing tower 13 from the middle of the slurry oxidation area at the bottom of the desulfurizing tower 13 and the spraying layer 10, flows from bottom to top in the desulfurizing tower 13 and is in countercurrent contact with the spraying slurry, and SO in the flue gas2And gaseous SeO2Will be absorbed and purified by the spraying slurry.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims (5)

1. The utility model provides a device of high-efficient desorption of sulfur dioxide degree of depth desorption cooperation gaseous state heavy metal selenium in flue gas, including the desulfurizing tower with set up in circulating pump outside the desulfurizing tower, the desulfurizing tower bottom sets up the oxidation thick liquid pond, and desulfurizing tower upper portion sets up sprays the layer, oxidation thick liquid pond and spray and set up the flue gas entry between the layer, the circulating pump will slurry in the oxidation thick liquid pond carry extremely spray the layer, its characterized in that, the device still include ozone generating device, oxidation fan, lime stone thick liquid preparation facilities and pH controlling means, ozone generating device is used for generating strong oxide matter ozone, the oxidation fan is used for blowing in the air, ozone that ozone generating device generated with form after the air mixture that the oxidation fan was blown in and force oxidizing gas, and will strongOxygenized gas is input into the oxidation slurry pond, the limestone slurry preparation device is used for supplementing SO into the oxidation slurry pond2And SeO2The limestone slurry of (1); the pH control device is used for measuring the pH value of the slurry in the oxidation slurry pool, feeding back the pH value to the adjusting control loop to adjust the limestone slurry supply amount of the limestone slurry preparation device, and controlling the slurry in the oxidation slurry pool to operate within the range of pH 5.4-6.4.
2. The device for deeply removing the sulfur dioxide and efficiently removing the gaseous heavy metal selenium in the flue gas in coordination with the claim 1 is characterized by further comprising a discharge pump, wherein the discharge pump is communicated with the oxidation slurry tank and is used for intermittently discharging the gypsum and the desulfurization wastewater generated in the oxidation slurry tank.
3. The device for deeply removing sulfur dioxide and efficiently removing gaseous heavy metal selenium according to claim 1, further comprising a stirrer, wherein the stirrer is arranged in the oxidation slurry tank and is used for stirring the slurry in the oxidation slurry tank to ensure that the slurry and the forced oxidation gas are uniformly mixed.
4. The device for deeply removing sulfur dioxide in flue gas and efficiently removing gaseous heavy metal selenium according to claim 1, wherein the ozone generating device and the oxidation fan are arranged in parallel, and the ozone generating device generates ozone by using a single oxygen source and then mixes the ozone with air blown by the oxidation fan; the sole source of oxygen is air or pure oxygen.
5. The device for deeply removing sulfur dioxide in flue gas and efficiently removing gaseous heavy metal selenium according to claim 1, wherein the ozone generating device and the oxidation fan are arranged in series, the ozone generating device is arranged between the oxidation fan and the desulfurization tower, and air blown by the oxidation fan is directly used as an oxygen source of the ozone generating device, so that the volume concentration of ozone in the mixed gas reaches 1% -2%.
CN202020917675.3U 2020-05-27 2020-05-27 Device for deeply removing sulfur dioxide in flue gas and efficiently removing gaseous heavy metal selenium Active CN212369922U (en)

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