CN216457976U - Dry and semi-dry desulfurized ash multiphase jet oxidation tower - Google Patents
Dry and semi-dry desulfurized ash multiphase jet oxidation tower Download PDFInfo
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- 238000000034 method Methods 0.000 claims abstract description 55
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Abstract
The utility model relates to a dry-process and semi-dry-process desulfurized ash multiphase jet oxidation tower, aiming at solving the problem that the desulfurized ash of the dry process and the semi-dry process cannot be comprehensively utilized in a large scaleThe problems are that: the whole device mainly comprises a jet aeration tower and SO2The system comprises an absorption tower, a first jet aerator, a second jet aerator, a first slurry pump, a second slurry pump, a first air blower, a second air blower, an acid liquid pump and the like; the conventional one-step oxidation process is decomposed into multiple steps, the pH of the slurry in each step is accurately controlled, and SO is combined2The reabsorption measures not only avoid CaSO3A large amount of decomposition and SO2Secondary pollution and ensures sufficient CaSO3In a liquid phase reaction system, the problem of slow oxidation rate caused by high alkalinity of the dry and semi-dry desulfurized fly ash is finally solved, and clean and efficient modification of the desulfurized fly ash is creatively realized.
Description
Technical Field
The utility model belongs to the technical field of resources and environment, relates to stabilization modification and resource utilization of dry and semi-dry desulfurized fly ash, and particularly relates to a dry and semi-dry desulfurized fly ash multiphase jet oxidation tower.
Background
In recent years, due to the high importance of our country on the ecological environment protection, and the high importance of our country on SO2The emission requirements are becoming more and more strict, and the flue gas desulfurization process is widely popularized and applied in the industries of coal-fired power plants, steel sintering, industrial boilers, petrochemical industry and the like, wherein the dry and semi-dry desulfurization processes represented by CFB, LIFAC, NID, SDA and CDSI have the advantages of small occupied area, low investment, low operating cost, low energy consumption, no sewage and waste acid emission and the like, and become the trend of the future development of the flue gas desulfurization technology.
The dry and semi-dry desulfurizing process features that powdered or granular calcium-base absorbent is used to eliminate SO from fume2The desulfurization product is dry powder and mainly comprises CaSO3·1、2H2O、CaCO3、CaSO4·2H2O and a small amount of unreacted Ca (OH)2And the like. In the wet desulfurization process phaseCompared with the prior art, the desulfurized fly ash produced by the dry and semi-dry desulfurization process has more complex components, has the characteristics of high sulfur, high calcium and high alkalinity, and is especially CaSO3The proportion of (A) is very high, and the components with poor chemical stability make the dry-method and semi-dry-method desulfurized fly ash show unusual physicochemical characteristics. Because the research on the properties, the reaction characteristics and the action mechanism of the solid wastes is not systematic and deep, people have more attentions on the comprehensive utilization of the solid wastes at present, an effective utilization way is not formed, so that the dry-process and semi-dry-process desulfurized ash is accumulated in a large quantity or is simply buried, a large amount of valuable land resources are occupied, the enterprise burden is increased, and the further popularization and application of the dry-process and semi-dry-process desulfurized process are restricted. Furthermore, since CaSO3Is unstable and is easy to cause SO after long-term stacking2Release of (a) and pose a potential threat to the environment; meanwhile, because the dry-process and semi-dry-process desulfurized fly ash has smaller particle size and lighter weight, dust pollution can be generated once the desulfurized fly ash is blown by wind.
For the comprehensive utilization of the dry-process and semi-dry-process desulfurized fly ash, the related work at home and abroad does not form a complete system at present, the obtained achievements belong to the research nature, any technology for large-scale industrial application is not formed, and the following four aspects are mainly considered:
(1) the chemical composition of the desulphurisation ash is quite complex. The phase compositions of the general dry and semi-dry desulfurized fly ash comprise CaSO4、CaSO3、CaCO3、Ca(OH)2、CaO、MgCO3And the components are complex and diversified in chemical property, so that the comprehensive utilization is more limited and more difficult.
(2) The fluctuation of the content of each component of the desulfurized fly ash is large. Due to the differences of the operation, operation and management levels of different enterprises, the differences of different raw material types and proportioning schemes, the differences of desulfurization efficiencies of different desulfurization processes and the differences of components of different batches of coal, the content of each component of desulfurization ash generated by different desulfurization equipment and different periods of time of the same equipment can fluctuate greatly. Such fluctuations bring about frequent changes in the overall chemistry, which makes its comprehensive utilization difficult.
(3) The chemical nature of the various components in the desulfurized fly ash is unstable. CaSO in desulfurized fly ash3、Ca(OH)2And CaO is chemically unstable and changes with environmental and time changes. CaSO3Easily decomposed in acid environment or under high temperature condition of neutral or reducing atmosphere to make SO2Is released again to cause secondary pollution of the environment, and simultaneously CaSO3Will be oxidized into CaSO in the air4Resulting in instability of the properties of the desulfurized fly ash material over long periods of use. CaO readily absorbs water to form Ca (OH)2Causing a volume-inhomogeneous expansion, Ca (OH)2Reabsorbing CO from air2To produce CaCO3. These instabilities pose a major obstacle to the comprehensive utilization of the desulfurized fly ash.
(4) CaSO in desulfurized fly ash3Has a high content of and CaSO3The action effect and mechanism of the drug are not clear. CaSO in dry and semi-dry desulfurized fly ash3The content of (A) can be up to more than 50%, and CaSO3The influence on the overall mechanical properties and stability of the material is yet to be further researched and confirmed. For example, when desulfurized fly ash is used as a cement retarder, CaSO3The retarding effect and the influence on the mechanical property of the cement are still greatly controversial.
Based on the basic chemical principles of acid-base neutralization and oxidation-reduction, the desulfurization ash of the dry method and the semi-dry method is subjected to forced oxidation modification in a sulfuric acid environment, so that the problems in the four aspects of limiting the large-scale comprehensive utilization of the solid waste can be solved at one stroke: CaCO in desulfurized ash under the action of acid-base neutralization reaction3、Ca(OH)2And the basic components such as CaO and the like are all rapidly converted into CaSO4(ii) a And CaSO with poor stability under the action of oxidation reaction3Will also be converted into CaSO4. Thus, the original dry and semi-dry desulfurized fly ash with complex and various components and unstable content and chemical properties of various components is converted into stable CaSO4Is a solid waste with chemical properties similar to those of wet-process desulfurization gypsum as a main component. Because of the wet desulfurization stoneThe technical problems of all links in the comprehensive utilization of the paste are basically solved, so that the modified dry-process and semi-dry-process desulfurization ash can be comprehensively utilized on a large scale according to various technical routes of wet-process desulfurization gypsum, and the increasingly urgent treatment problem of the large amount of solid wastes is thoroughly solved. Meanwhile, the resource utilization of the waste sulfuric acid is realized.
However, due to SO3 2-Will react with excessive H+Combine to form pollutant SO2Therefore, the pH of the reaction solution cannot be too low; meanwhile, the pH value of the solution is rapidly increased in the dissolving process due to strong alkalinity of the desulfurized fly ash, and CaSO3The solubility of (a) is very low and further decreases with the increase of the pH value, so that the oxidation rate is greatly reduced, and therefore, the solid-to-liquid ratio in the dissolving process, namely the pH value of the solution, cannot be too high. In conclusion, the high-efficiency oxidation of the dry and semi-dry desulfurized fly ash is realized in a one-step method and a conventional slurry manner, and the SO-free desulfurization is realized2The release is very difficult and innovative oxidative modification devices and methods adapted to the characteristics of the desulfurized fly ash need to be developed.
Disclosure of Invention
In order to solve the technical problems in the background art, the utility model provides the dry-process and semi-dry-process desulfurized ash multiphase jet oxidation tower which is low in cost, stable in operation, convenient to construct and flexible in operation.
In order to achieve the aim, the utility model provides a dry and semi-dry desulfurized fly ash multiphase jet oxidation tower which comprises a jet aeration tower and SO2An absorption tower, a first jet aerator, a second jet aerator, a first slurry pump, a second slurry pump, a first air blower, a second air blower, an acid liquid pump, a first desulfurization ash feeding pipe, a second desulfurization ash feeding pipe, a first flexible joint, a second flexible joint, a first oxidation air pipe, a second oxidation air pipe, a first exhaust pipe, a second exhaust pipe, a first liquid level meter flange, a second liquid level meter flange, a first pressure meter flange, a second pressure meter flange, a first high-level slurry discharge pipe, a second high-level slurry discharge pipe, a first pH probe flange, a second pH probe flange, a first thermometer flange, a second thermometer flange, a first densimeter flange, a second slurry pump, a first air blower, a second air blower, an acid liquid pump, a first desulfurization ash feeding pipe, a second desulfurization ash feeding pipe, a first flexible joint, a second flexible joint, a first oxidation air pipe, a second oxidation air pipe, a first exhaust pipe, a second pH probe flange, a first thermometer flange, a second densimeter flange, a second thermometer flange, a second high-level meter flange, a second high-level meter, a high-,The second densimeter flange, the slurry reabsorption merging pipe, the first low-level slurry discharge pipe, the second low-level slurry discharge pipe, the acid liquor feed pipe, the first manhole and the second manhole.
The first jet aerator and the second jet aerator are respectively arranged on the jet aeration tower and the SO2The inner lower position of the absorption tower; the first desulfurized fly ash feeding pipe, the first flexible joint, the first air oxidation pipe, the first exhaust pipe, the first liquid level meter flange and the first pressure meter flange are arranged at the top of the jet flow aeration tower; a second desulfurized fly ash feeding pipe, a second flexible joint, a second oxidation air pipe, a second exhaust pipe, a second liquid level meter flange and a second pressure meter flange are arranged on the SO2The top of the absorber column; the first and second high-level slurry discharge pipes are respectively arranged on the jet aeration tower and the SO2An upper side wall of the absorber column; the first pH probe flange and the second pH probe flange are respectively arranged on the jet aeration tower and the SO at equal intervals from top to bottom2A side wall of the absorber column; the first thermometer flange and the second thermometer flange are respectively arranged on the jet aeration tower and the SO2A middle side wall of the absorber; the first densimeter flange and the second densimeter flange are respectively arranged on the jet aeration tower and the SO2The side wall of the middle lower part of the absorption tower; the reabsorption slurry merging pipe is arranged on the side wall of the lower part of the jet aeration tower; the first and second low-level slurry discharge pipes are respectively arranged on the jet aeration tower and the SO2The bottom of the absorber; the acid liquor feeding pipe is arranged at the bottom of the jet flow aeration tower; the first manhole and the second manhole are respectively arranged on the jet aeration tower and the SO2The lower side wall of the absorption tower.
The inlet of the first slurry pump is connected with the first high-level slurry discharge pipe, the first low-level slurry discharge pipe and the clear water pipe through a four-way pipeline, and the outlet of the first slurry pump is connected with the slurry inlet of the first jet aerator and the gypsum dehydration unit through a three-way pipeline; the inlet of the second slurry pump is connected with the second high-level slurry discharge pipe, the second low-level slurry discharge pipe and the clear water pipe through a four-way pipeline, and the outlet of the second slurry pump is connected with the slurry inlet of the second jet aerator and the reabsorption slurry merging pipe through a three-way pipeline; the outlets of the first and second blowers are respectively connected with the air inlets of the first and second jet aerators through a first and second oxidation air pipes; the inlet of the second blower is connected with the first exhaust pipe; the outlet of the acid liquor pump is connected with an acid liquor feeding pipe; the first flexible joint and the second flexible joint are respectively connected with the first desulfurized fly ash feeding pipe and the second desulfurized fly ash feeding pipe.
The jet flow aeration tower and the SO2The absorption tower is in a vertical cylindrical shape, and the height-diameter ratio is 2-10.
The first jet aerator and the second jet aerator both adopt a multi-nozzle and central arrangement mode.
The first blower and the second blower adopt Roots blowers or centrifugal blowers.
The acid liquid pump adopts a metering pump.
The first flexible joint and the second flexible joint both use a rubber corrugated pipe as a main body.
The number of the first pH probe flange and the number of the second pH probe flange are 3-10, and the first pH probe flange and the second pH probe flange are respectively arranged along the jet aeration tower and the SO2The height direction of the absorption tower is arranged from top to bottom at equal intervals.
The second exhaust pipe is provided with SO2Provided is an online monitoring device.
The utility model also provides an operation treatment method of the dry and semi-dry desulfurized fly ash multiphase jet oxidation tower, which is characterized by comprising the following steps: the method comprises the following eleven steps:
the method comprises the following steps: and (4) analyzing and testing raw materials. Analyzing and testing the components of the dry-method and semi-dry-method desulfurized fly ash to determine CaSO in the desulfurized fly ash3And the contents of various strongly basic compounds.
Step two: and (5) preparing alkali liquor. Only opening the inlet clear water pipeline and the outlet aerator pipeline of the second slurry pump, and utilizing the second slurry pump to supply SO2Clean water is injected into the absorption tower, and after the liquid level is higher than the second high-level slurry discharge pipe, an inlet high-level slurry pipeline of a second slurry pump is opened, and an inlet clean water pipeline is closed; conveying the desulfurized ash into SO through the second flexible joint and the second desulfurized ash feeding pipe by using a pipe chain or a screw conveyer2An absorption tower; the desulfurized ash which just enters the tower is immediately sucked into a second slurry pump and is sprayed out by a nozzle of a second jet aerator to complete the processes of rapid and sufficient mixing and dissolving with clear water, and finally the pH value is formed>10, a slurry; stopping feeding of the desulfurized fly ash, and opening the inlet low-level slurry of the second slurry pumpAnd the liquid pipeline closes the inlet high-level slurry pipeline.
Step three: and (4) preparing acid liquor. Gradually injecting waste sulfuric acid with low heavy metal and organic pollutant contents and mass fraction of 1-95% into the jet aeration tower by using the acid liquid pump; only opening an inlet clear water pipeline and an outlet aerator pipeline of the first slurry pump, and injecting clear water into the jet flow aeration tower by using the first slurry pump; when the pH value of the solution in the tower is stabilized between 2.2 and 4.2 and the liquid level is higher than the first high-level slurry discharge pipe, stopping feeding the waste sulfuric acid and the clean water; and opening an inlet high-level slurry pipeline of the first slurry pump, and closing an inlet clean water pipeline.
Step four: and (4) acidifying the desulfurized fly ash. Conveying the desulfurized ash into a jet flow aeration tower through the first flexible joint and a first desulfurized ash feeding pipe by utilizing a pipe chain or a screw conveyor; the desulfurized ash which just enters the tower is immediately sucked into a first slurry pump and is sprayed out by a nozzle of a first jet aerator, so that the desulfurized ash and the acid liquor are quickly and fully mixed, dissolved and reacted; and stopping feeding the desulfurized fly ash when the pH value of the solution rises to 3.1-6.2 and is kept stable.
Step five: and (4) forced oxidation. Opening an inlet low-level slurry pipeline of the first slurry pump, and closing an inlet high-level slurry pipeline; the first jet aerator sucks air through a first air oxidation pipe and sprays the air and the solution in the step four together through a nozzle to finish the multiphase mixing and high-efficiency mass transfer process, and HSO in the solution at the moment3 -To be O2Oxidation to SO4 2-To release H+Thereby reducing the pH value of the solution; when the suction provided by the first jet aerator is insufficient, the first air blower is started to provide enough power for air.
Step six: and (5) carrying out secondary acidification. When the pH value of the solution in the fifth step tends to be stable, starting the acid liquid pump, and gradually adding the waste sulfuric acid in the fourth step into the jet aeration tower; the waste sulfuric acid which just enters the tower is immediately sucked into a first slurry pump and is sprayed out by a nozzle of a first jet aerator, so that the processes of quick and sufficient mixing and reaction with the solution are completed, the pH value of the solution is reduced to 2.2-4.2 again, and then an acid liquid pump is closed; and opening an inlet high-level slurry pipeline of the first slurry pump, and closing an inlet low-level slurry pipeline.
Step seven: and (4) carrying out multi-step circulation. Continuously repeating the fourth step to the sixth step to ensure that solid CaSO gradually exists in the solution in the sixth step4And separating out, and finally forming slurry with the solid content of 6-30%.
Step eight: and (5) partially discharging the slurry. When the liquid level or the density of the slurry in the step seven reaches a certain numerical value, opening an inlet low-level slurry pipeline and an outlet dehydration unit pipeline of the first slurry pump, closing an inlet high-level slurry pipeline and an outlet aerator pipeline, discharging a part of the slurry by using the first slurry pump, and sending the discharged slurry into a dehydration unit to produce a gypsum product; in the slurry discharging process, the liquid level in the jet aeration tower is kept higher than the first high-level slurry discharging pipe; and after the slurry is discharged, opening an inlet high-level slurry pipeline and an outlet aerator pipeline of the first slurry pump, and closing an inlet low-level slurry pipeline and an outlet dehydration unit pipeline.
Step nine: SO (SO)2And (4) absorbing again. During multi-stage cyclic oxidation, especially secondary acidification, there may be local too low pH of the slurry resulting in incompletely oxidized SO3 2-With excess H+Combine to release SO2In the case of (3), this fraction of SO2Will be discharged through said first exhaust pipe; the second jet aerator uses a second oxidation air pipe to oxidize the SO2Sucking the slurry and spraying the slurry and the alkaline slurry from the second step through a nozzle to realize multiphase mixing and high-efficiency mass transfer and complete SO2A resorption process; when the suction provided by the second jet aerator is insufficient, the second air blower is started to carry SO2The air flow of (a) provides sufficient power.
Step ten: the reabsorbed slurry is merged. Continuously absorbing SO with the alkaline slurry of the second step2The pH value thereof gradually decreases; when the temperature is reduced to below 8.5 and the secondary acidification in the step six is finished, opening an outlet reabsorption slurry merging pipeline of the second slurry pump, closing an outlet aerator pipeline, and utilizingThe second slurry pump feeds the alkaline slurry into the jet aeration tower; and opening the inlet low-position slurry pipeline of the first slurry pump, closing the inlet high-position slurry pipeline, and performing merging oxidation treatment.
Step eleven: and finishing the modification. And continuously repeating the second step, the fourth step and the tenth step to finally complete the multiphase jet flow oxidation of the desulfurization ash by the dry method and the semi-dry method.
Compared with the prior art, the utility model has the following beneficial effects:
(1) the pH value of the acidified slurry in the whole multiphase jet oxidation process is controlled to be 2.2-6.2 all the time according to the optimal solid-liquid ratio, so that CaSO in the desulfurized fly ash can be avoided to the maximum extent3Decompose to release SO2And can ensure enough CaSO3In a liquid phase reaction system, thereby remarkably improving the reaction rate of the whole oxidation process.
(2) The conventional one-step oxidation process is decomposed into multiple steps, and the problem of slow oxidation rate caused by high alkalinity of the desulfurization ash by a dry method and a semi-dry method is solved by accurately controlling the solid-liquid ratio and the pH value of slurry in each step of oxidation process, so that the high-efficiency oxidation of the high-alkalinity desulfurization ash is creatively realized.
(3) CaSO in desulfurized fly ash by using novel jet aeration technology3The forced oxidation has strong mixing and stirring effects of the multi-nozzle jet aerator, has higher oxygenation capacity, oxygen utilization rate and oxygen power transfer efficiency, also has the advantages of simple structure, no moving parts, reliable work, flexible operation, convenient adjustment, difficult blockage, easy maintenance and management, low operating cost and the like, and can obviously improve the reaction rate of the forced oxidation process.
(4) The method can simultaneously realize the resource utilization of the dry-process and semi-dry-process desulfurized fly ash and the waste sulfuric acid, thereby achieving the purposes of treating waste by waste and realizing synergistic circulation and obtaining better economic and environmental benefits.
(5) Using a double column reactor type, using a second reaction column for SO2And the secondary pollution risk is further reduced by carrying out reabsorption.
(6) The flexible joint can effectively relieve the harmful vibration transmitted between the desulfurization ash conveying equipment and the reaction tower while ensuring the system tightness, and improves the safety and stability of the system operation.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 shows the desulfurized ash and 80% concentrated H from a semi-dry process in a steel plant2SO4The reagent is used as raw material, pH regulation acidification and forced oxidation laboratory tests are carried out according to the step method of the utility model, and finally when the solid content of the slurry reaches 10 percent, the slurry comes from CaSO3Schematic diagram of S-balance.
The reference numerals in fig. 1 are as follows: 1-jet aeration tower, 2-SO2An absorption tower, 3-a first jet aerator, 4-a second jet aerator, 5-a first slurry pump, 6-a second slurry pump, 7-a first blower, 8-a second blower, 9-an acid liquor pump, 10-a first desulfurized fly ash feed pipe, 11-a second desulfurized fly ash feed pipe, 12-a first flexible joint, 13-a second flexible joint, 14-a first oxidized air pipe, 15-a second oxidized air pipe, 16-a first exhaust pipe, 17-a second exhaust pipe, 18-a first level gauge flange, 19-a second level gauge flange, 20-a first pressure gauge flange, 21-a second pressure gauge flange, 22-a first high level slurry discharge pipe, 23-a second high level slurry discharge pipe, 24-a first pH probe flange, 25-a second pH probe flange, 26-a first temperature gauge flange, 27-a second temperature gauge flange, 28-a first temperature gauge flange, 29-a second density gauge flange, 30-a reabsorbed slurry merging pipe, 31-a first low-level slurry discharge pipe, 32-a second low-level slurry discharge pipe, 33-an acid liquid feed pipe, 34-a first manhole and 35-a second manhole.
Detailed Description
The utility model is further described with reference to the following figures and specific examples.
As shown in figures 1-2, the utility model relates to a dry and semi-dry desulfurized fly ash multiphase jet oxidation tower, which comprises a jet aeration tower 1 and SO2An absorption tower 2, a first jet aerator 3, a second jet aerator 4, a first slurry pump 5, a second slurry pump 6, a first air blower 7, a second air blower 8 and acid liquorThe device comprises a pump 9, a first desulfurized fly ash feeding pipe 10, a second desulfurized fly ash feeding pipe 11, a first flexible joint 12, a second flexible joint 13, a first oxidation air pipe 14, a second oxidation air pipe 15, a first exhaust pipe 16, a second exhaust pipe 17, a first liquid level meter flange 18, a second liquid level meter flange 19, a first pressure meter flange 20, a second pressure meter flange 21, a first high-level slurry discharge pipe 22, a second high-level slurry discharge pipe 23, a first pH probe flange 24, a second pH probe flange 25, a first thermometer flange 26, a second thermometer flange 27, a first densimeter flange 28, a second densimeter flange 29, a reabsorber slurry merging pipe 30, a first low-level slurry discharge pipe 31, a second low-level slurry discharge pipe 32, an acid liquor feeding pipe 33, a first manhole 34 and a second manhole 35.
The first 3 and the second jet aerator 4 are respectively arranged on the jet aeration tower 1 and the SO2The inner part of the absorption tower 2 is low; the first desulfurized fly ash feeding pipe 10, the first flexible joint 12, the first oxidation air pipe 14, the first exhaust pipe 16, the first liquid level meter flange 18 and the first pressure meter flange 20 are arranged at the top of the jet aeration tower 1; a second desulfurized fly ash feeding pipe 11, a second flexible joint 13, a second oxidation air pipe 15, a second exhaust pipe 17, a second liquid level gauge flange 19 and a second pressure gauge flange 21 are arranged on the SO2The top of the absorber 2; a first 22 and a second high-level slurry discharge pipe 23 are respectively arranged on the jet aeration tower 1 and the SO2The upper side wall of the absorption tower 2; the first 24 and the second pH probe flanges 25 are respectively arranged on the jet aeration tower 1 and the SO at equal intervals from top to bottom2The side wall of the absorption tower 2; a first thermometer flange 26 and a second thermometer flange 27 are respectively arranged on the jet flow aeration tower 1 and the SO2The middle side wall of the absorption tower 2; the first 28 and the second densimeter flanges 29 are respectively arranged on the jet aeration tower 1 and the SO2The side wall of the middle lower part of the absorption tower 2; the reabsorption slurry merging pipe 30 is arranged on the lower side wall of the jet aeration tower 1; a first 31 and a second low-level slurry discharge pipe 32 are respectively arranged on the jet aeration tower 1 and the SO2The bottom of the absorber 2; the acid liquor feeding pipe 33 is arranged at the bottom of the jet aeration tower 1; the first 34 and the second manholes 35 are respectively arranged on the jet aeration tower 1 and the SO2The lower side wall of the absorption column 2.
The inlet of the first slurry pump 5 is connected with a first high 22 and low slurry discharge pipe 31 and a clean water pipe through a four-way pipeline, and the outlet is connected with the slurry inlet of the first jet aerator 3 and a gypsum dehydration unit through a three-way pipeline; the inlet of the second slurry pump 6 is connected with a second high 23, low slurry discharge pipe 32 and a clean water pipe through a four-way pipeline, and the outlet is connected with the slurry inlet of the second jet aerator 4 and the reabsorption slurry merging pipe 30 through a three-way pipeline; the outlets of the first 7 and the second blower 8 are respectively connected with the air inlets of the first 3 and the second jet aerator 4 through a first 14 and a second oxidizing air pipe 15; the inlet of the second blower 8 is connected with a first exhaust pipe 16; the outlet of the acid liquid pump 9 is connected with the acid liquid feeding pipe 33; the first 12 and the second flexible joint 13 are respectively connected with the first 10 and the second desulfurized fly ash feeding pipes 11.
Jet aeration column 1 and SO2The absorption tower 2 is in a vertical cylindrical shape, and the height-diameter ratio is 2-10.
The first 3 and the second jet aerators 4 adopt a multi-nozzle and central arrangement type.
The first blower 7 and the second blower 8 both adopt roots blowers or centrifugal blowers.
The acid liquid pump 9 adopts a metering pump.
The first 12 and second flexible joints 13 are both made of rubber corrugated pipes as main bodies.
The number of the first 24 pH probe flanges and the second pH probe flanges 25 is 3-10, and the first 24 pH probe flanges and the second 24 pH probe flanges are respectively arranged along the jet aeration tower 1 and the SO2The absorption towers 2 are arranged at equal intervals from top to bottom in the height direction.
The second exhaust pipe 17 is provided with SO2Provided is an online monitoring device.
The operation treatment method of the dry and semi-dry desulfurized fly ash multiphase jet oxidation tower is characterized by comprising the following steps of: the method comprises the following eleven steps:
the method comprises the following steps: and (4) analyzing and testing raw materials. Analyzing and testing the components of the dry-method and semi-dry-method desulfurized fly ash to determine CaSO in the desulfurized fly ash3And the contents of various strongly basic compounds.
Step two: and (5) preparing alkali liquor. Only opening the inlet clear water pipeline and the outlet aerator pipeline of the second slurry pump 6, and utilizing the second slurry pump 6 to supply SO2Clean water is injected into the absorption tower 2,when the liquid level is higher than the second high-level slurry discharge pipe 23, opening an inlet high-level slurry pipeline of the second slurry pump 6, and closing an inlet clear water pipeline; the desulfurized fly ash is sent to SO through the second flexible joint 13 and the second desulfurized fly ash feeding pipe 11 by using a pipe chain or a screw conveyer2An absorption tower 2; the desulfurized ash which just enters the tower is immediately sucked into a second slurry pump 6 and is sprayed out by a nozzle of a second jet aerator 4, the processes of rapid and sufficient mixing and dissolving with clear water are completed, and finally the pH value is formed>10, a slurry; and stopping feeding of the desulfurized fly ash, opening the inlet low-level slurry pipeline of the second slurry pump 6, and closing the inlet high-level slurry pipeline.
Step three: and (4) preparing acid liquor. Gradually injecting waste sulfuric acid with low contents of heavy metals and organic pollutants and a mass fraction of 1-95% into the jet aeration tower 1 by using the acid liquid pump 9; only opening an inlet clear water pipeline and an outlet aerator pipeline of the first slurry pump 5, and injecting clear water into the jet flow aeration tower 1 by using the first slurry pump 5; when the pH value of the solution in the tower is stabilized between 2.2 and 4.2 and the liquid level is higher than the first high-level slurry discharge pipe 22, stopping feeding the waste sulfuric acid and the clean water; and opening the inlet high-level slurry pipeline of the first slurry pump 5 and closing the inlet clean water pipeline.
Step four: and (4) acidifying the desulfurized fly ash. Feeding desulfurized ash into the jet aeration tower 1 through the first flexible joint 12 and the first desulfurized ash feeding pipe 10 by using a pipe chain or a screw conveyor; the desulfurized ash which just enters the tower is immediately sucked into a first slurry pump 5 and is sprayed out by a nozzle of a first jet aerator 3, so that the processes of quick and sufficient mixing, dissolving and reacting with acid liquor are completed; and stopping feeding the desulfurized fly ash when the pH value of the solution rises to 3.1-6.2 and is kept stable.
Step five: and (4) forced oxidation. Opening an inlet low-level slurry pipeline of the first slurry pump 5, and closing an inlet high-level slurry pipeline; the first jet aerator 3 sucks air through a first air oxidation pipe 14 and sprays the air and the solution in the step four together through a nozzle to complete the multiphase mixing and high-efficiency mass transfer process, wherein HSO in the solution is at the moment3 -To be protected by O2Oxidation to SO4 2-To release H+Thereby reducing the pH value of the solution; when the suction provided by the first jet aerator 3 is insufficient, the first blower 7 is turned on to provide sufficient power for the air.
Step six: and (5) carrying out secondary acidification. When the pH value of the solution in the fifth step tends to be stable, starting the acid liquid pump 9, and gradually adding the waste sulfuric acid in the fourth step into the jet aeration tower 1; the waste sulfuric acid which just enters the tower is immediately sucked into a first slurry pump 5 and is sprayed out by a nozzle of a first jet aerator 3, so that the processes of rapid and sufficient mixing and reaction with the solution are completed, the pH value of the solution is reduced to 2.2-4.2 again, and then an acid liquid pump 9 is closed; and opening an inlet high-level slurry pipeline of the first slurry pump 5, and closing an inlet low-level slurry pipeline.
Step seven: and (4) carrying out multi-step circulation. Continuously repeating the fourth step to the sixth step to ensure that solid CaSO gradually exists in the solution in the sixth step4Precipitating and finally forming slurry with the solid content of 6-30%.
Step eight: and (5) partially discharging the slurry. When the liquid level or the density of the slurry in the step seven reaches a certain numerical value, opening an inlet low-level slurry pipeline and an outlet dehydration unit pipeline of the first slurry pump 5, closing an inlet high-level slurry pipeline and an outlet aerator pipeline, discharging a part of the slurry by using the first slurry pump 5, and sending the discharged slurry to a dehydration unit to produce a gypsum product; the liquid level in the jet aeration tower 1 is kept higher than the first high-level slurry discharge pipe 22 in the slurry discharge process; and after the slurry discharge is finished, opening an inlet high-level slurry pipeline and an outlet aerator pipeline of the first slurry pump 5, and closing an inlet low-level slurry pipeline and an outlet dehydration unit pipeline.
Step nine: SO (SO)2And (4) absorbing again. During multi-stage cyclic oxidation, especially secondary acidification, there may be local too low pH of the slurry resulting in incompletely oxidized SO3 2-With excess H+Combine to release SO2In the case of (3), this fraction of SO2Will be discharged through said first exhaust duct 16; the second jet aerator 4 leads the part of SO to pass through a second oxidation air pipe 152Sucking in and mixing it with the alkaline slurry of step twoIs sprayed out by a nozzle to realize multi-phase mixing and high-efficiency mass transfer and finish SO2A resorption process; when the suction provided by the second jet aerator 4 is insufficient, the second blower 8 is turned on to entrain SO2The air flow of (a) provides sufficient power.
Step ten: the reabsorbed slurry is merged. Continuously absorbing SO with the alkaline slurry of the second step2The pH value thereof gradually decreases; when the temperature is reduced to below 8.5 and the secondary acidification in the step six is finished, opening an outlet of the second slurry pump 6 to reabsorb the slurry merging pipeline, closing an outlet aerator pipeline, and feeding the alkaline slurry into the jet flow aeration tower 1 by using the second slurry pump 6; and opening the inlet low-level slurry pipeline of the first slurry pump 5, closing the inlet high-level slurry pipeline, and performing merging oxidation treatment.
Step eleven: and finishing the modification. And continuously repeating the second step, the fourth step and the tenth step to finally complete the multiphase jet flow oxidation of the desulfurization ash by the dry method and the semi-dry method.
The original components (percentages) of the semi-dry desulfurized fly ash of a certain steel plant are shown in Table 1. pH regulation acidification and forced oxidation tests are carried out according to the step method of the utility model, and when the solid content of the final slurry reaches 10%, the final slurry comes from CaSO3S-balance of (a) is shown in fig. 2. Table 2 shows the components (percentages) of the resulting oxidized product. As can be seen, CaSO is the most main component in the original semi-dry desulfurized fly ash3And CaCO339.65% and 32.77%, respectively, and a certain amount of MgCO3And Ca (OH)2Equal high alkalinity component, CaSO4The content of (A) is very low. Almost all CaSO in the original semi-dry desulfurized fly ash is obtained by the step method of the utility model3、CaCO3And Ca (OH)2Are all converted into dihydrate CaSO4While SO2Has little effluxion, and the oxidation product has dihydrate CaSO4The content of the modified starch reaches 93.97 percent, and a good modification effect is obtained.
TABLE 1 original composition of semidry desulfurized fly ash (dry basis)
TABLE 2 composition of the oxidation products (dry basis)
The embodiments described above are intended to enable those skilled in the art to fully understand and effectively use the utility model. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-mentioned embodiments, and modifications made by those skilled in the art according to the teachings of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.
Claims (8)
1. The dry and semi-dry desulfurized ash multiphase jet oxidation tower is characterized in that: it consists of a jet aeration tower and SO2The device comprises an absorption tower, a first jet aerator, a second jet aerator, a first slurry pump, a second slurry pump, a first air blower, a second air blower, an acid liquor pump, a first desulfurized fly ash feeding pipe, a second desulfurized fly ash feeding pipe, a first flexible joint, a second flexible joint, a first air oxidation pipe, a second air oxidation pipe, a first exhaust pipe, a second exhaust pipe, a first liquid level meter flange, a second liquid level meter flange, a first pressure meter flange, a second pressure meter flange, a first high-level slurry discharge pipe, a second high-level slurry discharge pipe, a first pH probe flange, a second pH probe flange, a first thermometer flange, a second thermometer flange, a first densimeter flange, a second densimeter flange, a reabsorption slurry merging pipe, a first low-level slurry discharge pipe, a second low-level slurry discharge pipe, an acid liquor feeding pipe, a first manhole and a second manhole;
the first jet aerator and the second jet aerator are respectively arranged on the jet aeration tower and the SO2The inner lower position of the absorption tower; first desulfurization ash inlet pipe, first gentleThe linear joint, the first air oxidation pipe, the first exhaust pipe, the first liquid level meter flange and the first pressure meter flange are arranged at the top of the jet flow aeration tower; the second desulfurized fly ash feeding pipe, the second flexible joint, the second oxidation air pipe, the second exhaust pipe, the second liquid level gauge flange and the second pressure gauge flange are arranged on the SO2The top of the absorber column; the first and second high-level slurry discharge pipes are respectively arranged on the jet aeration tower and the SO2An upper side wall of the absorber column; the first pH probe flange and the second pH probe flange are respectively arranged on the jet aeration tower and the SO at equal intervals from top to bottom2A side wall of the absorber column; the first thermometer flange and the second thermometer flange are respectively arranged on the jet flow aeration tower and the SO2A middle side wall of the absorber; the first densimeter flange and the second densimeter flange are respectively arranged on the jet aeration tower and the SO2The side wall of the middle lower part of the absorption tower; the reabsorption slurry merging pipe is arranged on the side wall of the lower part of the jet aeration tower; the first and second low-level slurry discharge pipes are respectively arranged on the jet aeration tower and the SO2The bottom of the absorber; the acid liquor feeding pipe is arranged at the bottom of the jet flow aeration tower; the first manhole and the second manhole are respectively arranged on the jet aeration tower and the SO2A lower side wall of the absorber;
the inlet of the first slurry pump is connected with the first high-level slurry discharge pipe, the first low-level slurry discharge pipe and the clear water pipe through a four-way pipeline, and the outlet of the first slurry pump is connected with the slurry inlet of the first jet aerator and the gypsum dehydration unit through a three-way pipeline; the inlet of the second slurry pump is connected with the second high-level slurry discharge pipe, the second low-level slurry discharge pipe and the clear water pipe through a four-way pipeline, and the outlet of the second slurry pump is connected with the slurry inlet of the second jet aerator and the reabsorption slurry merging pipe through a three-way pipeline; the outlets of the first and second blowers are respectively connected with the air inlets of the first and second jet aerators through a first and second oxidation air pipes; the inlet of the second blower is connected with the first exhaust pipe; the outlet of the acid liquor pump is connected with an acid liquor feeding pipe; the first flexible joint and the second flexible joint are respectively connected with a first desulfurized fly ash feeding pipe and a second desulfurized fly ash feeding pipe.
2. Dry, semi-dry according to claim 1The multiphase jet oxidation tower for the desulfurized fly ash by the method is characterized in that: the jet flow aeration tower and the SO2The absorption tower is in a vertical cylindrical shape, and the height-diameter ratio is 2-10.
3. The dry and semi-dry desulfurized ash multiphase jet oxidation tower according to claim 1, characterized in that: the first jet aerator and the second jet aerator both adopt a multi-nozzle and central arrangement mode.
4. The dry and semi-dry desulfurized ash multiphase jet oxidation tower according to claim 1, characterized in that: the first blower and the second blower adopt Roots blowers or centrifugal blowers.
5. The dry and semi-dry desulfurized ash multiphase jet oxidation tower according to claim 1, characterized in that: the first flexible joint and the second flexible joint both use a rubber corrugated pipe as a main body.
6. The dry and semi-dry desulfurized ash multiphase jet oxidation tower according to claim 1, characterized in that: the number of the first pH probe flange and the number of the second pH probe flange are 3-10, and the first pH probe flange and the second pH probe flange are respectively arranged along the jet aeration tower and the SO2The height direction of the absorption tower is arranged from top to bottom at equal intervals.
7. The dry and semi-dry desulfurized ash multiphase jet oxidation tower according to claim 1, characterized in that: the second exhaust pipe is provided with SO2Provided is an online monitoring device.
8. The dry and semi-dry desulfurized ash multiphase jet oxidation tower according to claim 1, characterized in that: the acid liquid pump adopts a metering pump.
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