CN212581532U - Continuous dry method/semi-dry method desulfurization ash stabilization treatment system - Google Patents
Continuous dry method/semi-dry method desulfurization ash stabilization treatment system Download PDFInfo
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Abstract
The utility model discloses a continuous dry method/semi-dry method desulfurization ash stabilizing treatment system, which comprises a desulfurization ash pulping tank, an alkali liquor tank, an acidification tank, a primary aeration tower and a secondary aeration tower which are arranged in sequence; the desulfurization ash pulping tank is connected with the slurry cyclone through a slurry pump, the underflow outlet of the slurry cyclone is connected with the desulfurization ash pulping tank, and the overflow outlet is connected with the lower part of the lye tank; the alkali liquor tank is connected with the acidification tank through an alkali liquor pump, the acidification tank is sequentially connected with a primary aeration tower and a secondary aeration tower through a feeding pump, the aeration tower is connected with a gypsum cyclone through a slurry discharge pump, an underflow outlet of the gypsum cyclone is connected with a gypsum dewatering machine, and an overflow outlet of the gypsum cyclone is connected with an overflow tank; the overflow tank is connected with the primary aeration tower through a circulating pump. The utility model discloses show the oxidation rate that improves whole modification process, realized the green cleanness of whole stabilization process. Effectively solves the problems in the prior art.
Description
Technical Field
The utility model belongs to the technical field of resource and environment, concretely relates to continuous dry method/semi-dry process desulfurization ash stabilization processing system to carry out stabilization processing and resource utilization to the produced desulfurization product of dry method/semi-dry process desulfurization technology.
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/semi-dry desulfurization process represented by CFB, LIFAC, NID, SDA and CDSI has the advantages of small occupied area, low investment, low operating cost, low energy consumption, no sewage and waste acid emission and the like, and becomes the trend of the future development of the flue gas desulfurization technology.
The dry/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. Compared with wet desulphurization process, the desulphurization ash produced by dry/semi-dry desulphurization process has much more complex components, and has the characteristics of high sulfur, high calcium and high alkalinity, especially CaSO3The proportion of (A) is high, and the component with poor chemical stability causes the dry/semi-dry desulfurized fly ash to show unusual physicochemical properties. 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, and an effective utilization way is not formed yet, so that the dry/semi-dry desulfurization ash is accumulated in a large amount 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/semi-dry desulfurization 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, the dry method/semi-dry method desulfurized ash has small particle size and light weight, and can fly everywhere to pollute air once blown by wind.
For the comprehensive utilization of the dry method/semi-dry method 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 property, 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/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. Desulfurization ofCaSO in 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/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.
In conclusion, under the new background that China vigorously advances the construction of 'waste-free cities' and 'waste-free society', the dry-process/semi-dry-process desulfurized fly ash is scientifically treated and finely utilized to realize harmlessness and deep recycling of the desulfurized fly ash, so that the method not only solves the technical problems to be solved urgently in the industries such as coal-fired power plants, steel sintering, industrial boilers, petrifaction and the like in China, but also promotes ecological civilization construction in China, promotes high-quality development, and realizes the inevitable requirements of comprehensive conservation and cyclic utilization of resources.
Based on the basic chemical principles of acid-base neutralization and oxidation-reduction, the dry/semi-dry desulfurization ash 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/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 the technical problems of each link in the comprehensive utilization of the wet desulphurization gypsum are basically solved, the modified dry/semi-dry desulphurization ash can be comprehensively utilized on a large scale according to various technical routes of the wet desulphurization gypsum, thereby thoroughly solving the increasingly urgent treatment problem of the large solid wastes. 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/semi-dry desulfurized 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 therefore requires the development of a treatment system adapted to the characteristics of the desulphurised ashes.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem that proposes among the background art, the utility model provides a continuous dry method/semidry process desulfurization ash stabilization processing system has low cost, and is high-efficient clean, and the operation is stable, and the construction is convenient, the nimble advantage of operation.
In order to achieve the above purpose, the utility model discloses technical scheme as follows: continuous dry method/semidry process desulfurization ash stabilization processing system, its characterized in that: comprises a desulfurization ash pulping tank, an alkali liquor tank, an acidification tank, a primary aeration tower and a secondary aeration tower which are arranged in sequence;
the desulfurization ash pulping tank is connected with the slurry cyclone through a slurry pump, the underflow outlet of the slurry cyclone is connected with the desulfurization ash pulping tank, and the overflow outlet of the slurry cyclone is connected with the lower part of the alkali liquor tank;
the alkali liquor tank is connected with the acidification tank through an alkali liquor pump, the acidification tank is connected with the primary aeration tower through a primary feeding pump, and the primary aeration tower is connected with the secondary aeration tower through a secondary feeding pump; the first-stage aeration tower and the second-stage aeration tower are connected with a gypsum cyclone through a slurry discharge pump, the underflow outlet of the gypsum cyclone is connected with a gypsum dehydrator, and the overflow outlet of the gypsum cyclone is connected with an overflow tank; the overflow tank is connected with the primary aeration tower through a circulating pump; the acid solution tank is connected with the acidification tank through an acid solution pump; the alkaline liquid tank is provided with a gas discharge pipe, and the acidification tank, the primary aeration tower and the secondary aeration tower are respectively provided with a first SO2Discharge pipe, second SO2Discharge pipe, third SO2Discharge pipe, first SO2Discharge pipe, second SO2Discharge pipe, third SO2The discharge pipe is connected with the bottom of the lye tank through a pipeline; a first-stage jet aerator and a second-stage jet aerator are respectively arranged in the first-stage aeration tower and the second-stage aeration tower.
Further: and a filtrate outlet of the gypsum dehydrator is connected with the overflow tank.
Further: the alkali liquor tank, the acidification tank, the primary aeration tower and the secondary aeration tower are all vertical cylinders, the height-diameter ratio is 1.6-16, and liquid level, pH and temperature online monitoring devices are arranged.
Further: the primary jet aerator and the secondary jet aerator have stirring and mixing functions.
Further: the gas discharge pipe is provided with SO2Provided is an online monitoring device.
Further: and stirring devices are arranged in the desulfurization ash pulping tank, the alkali liquor tank and the acidification tank.
Further: the lye pump, the acid liquid pump, the first-stage feeding pump, the second-stage feeding pump, the slurry discharging pump and the circulating pump all have metering functions.
Further: the slurry cyclone is provided with one or more underflow outlets, and when a plurality of underflow outlets are arranged, the underflow outlets are arranged at different heights along the axial direction of the slurry cyclone and are respectively connected with different desulfurized ash pulping tanks; the gypsum cyclone is provided with one or more underflow outlets, and when a plurality of underflow outlets are arranged, the underflow outlets are arranged at different heights along the axial direction of the gypsum cyclone and are respectively connected with inlets of different gypsum dewaterers. Further: the gypsum dehydrator is a vacuum belt dehydrator or a belt filter press.
Compared with the prior art, the utility model has the advantages of as follows:
(1) the pH value of the slurry in the acidification process is controlled to be between 2.1 and 5.8 all the time based on the optimal pH ratio, so that enough CaSO can be ensured3In a liquid phase reaction system, thereby obviously improving the oxidation rate of the whole modification process.
(2) By SO2The reabsorption of the catalyst avoids the occurrence of secondary pollution and realizes green and clean of the whole stabilization treatment process.
(3) CaSO in desulfurized fly ash by using novel jet aeration technology3The forced oxidation has strong mixing and stirring effects of the jet aerator, has higher oxygenation capacity, oxygen utilization rate and oxygen power transfer efficiency, 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 in the forced oxidation process.
(4) The method can simultaneously realize the resource utilization of the dry method/semi-dry method 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) The high-value utilization of the Mg element in the dry/semi-dry desulfurized fly ash can be realized, and the economic and environmental benefits are further improved.
Drawings
Fig. 1 is a schematic diagram of the system structure of the present invention.
The sequence numbers in the figures illustrate: 1 is an alkali liquor tank, 2 is an acidification tank, 3 is a primary jet aerator, 4 is a secondary jet aerator, 5 is a primary aeration tower, 6 is a secondary aeration tower, and 7 is a gas discharge pipeAnd 8 is a first SO2Discharge pipe 9 is second SO2Discharge pipe, 10 is third SO2The discharge pipe 11 is a desulfurized ash pulping tank, 12 is a slurry pump, 13 is a slurry cyclone, 14 is an alkali liquor pump, 15 is an acid liquor tank, 16 is an acid liquor pump, 17 is a primary feeding pump, 18 is a secondary feeding pump, 19 is a slurry discharge pump, 20 is a gypsum cyclone, 21 is a gypsum dehydrator, 22 is an overflow tank, and 23 is a circulating pump.
Detailed Description
The invention will be further explained with reference to the drawings and the specific embodiments.
As shown in figure 1, the continuous dry/semi-dry desulfurization ash stabilizing treatment system of the utility model comprises an alkaline solution tank 1, an acidification tank 2, a first-stage jet aerator 3, a second-stage jet aerator 4, a first-stage aeration tower 5, a second-stage aeration tower 6, a gas discharge pipe 7, a first SO2Discharge pipe 8, second SO2Discharge pipe 9, third SO2The system comprises a discharge pipe 10, a desulfurized fly ash pulping tank 11, a slurry pump 12, a slurry cyclone 13, an alkali liquor pump 14, an acid liquor tank 15, an acid liquor pump 16, a primary feeding pump 17, a secondary feeding pump 18, a slurry discharge pump 19, a gypsum cyclone 20, a gypsum dehydrator 21, an overflow tank 22 and a circulating pump 23.
The bottom of the lye tank 1 is provided with a desulfurization mortar inlet and SO2An inlet, the top of which is provided with a desulfurized mortar outlet; the bottom of the acidification tank 2 is provided with a desulfurized mortar inlet and an acid liquor inlet, and the top is provided with a discharge hole; the bottom of the primary aeration tower 5 is provided with a feed inlet, a slurry discharge port and an overflow circulation port, and the top is provided with a discharge port; the bottom of the second-stage aeration tower 6 is provided with a feed inlet and a slurry discharge port; the first-stage 3 and the second-stage jet aerator 4 are respectively arranged at the bottoms of the first-stage 5 and the second-stage aeration tower 6; gas discharge pipe 7, first SO2Discharge pipe 8, second SO2Discharge pipe 9 and third SO2The discharge pipe 10 is respectively arranged at the top of the alkali liquor tank 1, the acidification tank 2, the primary aeration tower 5 and the secondary aeration tower 6, and the first SO2Discharge pipe 8, second SO2Discharge pipe 9 and third SO2The discharge pipe 10 is connected with the SO of the lye tank 12The inlet is communicated; the outlet of the desulfurized fly ash pulping tank 11 is connected with the inlet of a slurry pump 12, the outlet of the slurry pump 12 is connected with the inlet of a slurry cyclone 13, and the slurryThe underflow outlet and the overflow outlet of the cyclone 13 are respectively connected with the desulfurized mortar inlets of the desulfurized mortar pulping tank 11 and the lye tank 1, the desulfurized mortar outlet of the lye tank 1 is connected with the inlet of the lye pump 14, the outlet of the lye pump 14 is connected with the desulfurized mortar inlet of the acidification tank 2, the outlet of the acid liquor tank 15 is connected with the inlet of the acid liquor pump 16, the outlet of the acid liquor pump 16 is connected with the acid liquor inlet of the acidification tank 2, the discharge outlet of the acidification tank 2 is connected with the inlet of the primary feeding pump 17, the outlet of the primary feeding pump 17 is connected with the feed inlet of the primary aeration tower 5, the discharge outlet of the primary aeration tower 5 is connected with the inlet of the secondary feeding pump 18, the outlet of the secondary feeding pump 18 is connected with the feed inlet of the secondary aeration tower 6, the slurry discharge ports of the primary aeration tower 5 and the secondary aeration tower 6 are both connected with the inlet of the slurry discharge pump 19, the outlet of the slurry discharge pump 19 is connected with the inlet of the gypsum cyclone 20, the underflow, the outlet of the overflow tank 22 is connected with the inlet of a circulating pump 23, and the outlet of the circulating pump 23 is connected with the overflow circulating port of the primary aeration tower 5.
The alkali liquor tank 1, the acidification tank 2, the primary aeration tower 5 and the secondary aeration tower 6 are all vertical cylinders, the height-diameter ratio is 1.6-16, and liquid level, pH and temperature online monitoring devices are arranged. The first-stage 3 and the second-stage jet aerator 4 have stirring and mixing functions. The gas discharge pipe 7 is provided with SO2Provided is an online monitoring device. Stirring devices are arranged in the desulfurized fly ash pulping tank 11, the lye tank 1 and the acidification tank 2. The lye pump 14, the acid liquid pump 16, the primary feeding pump 17, the secondary feeding pump 18, the slurry discharge pump 19 and the circulating pump 23 all have a metering function. The slurry cyclone 13 is provided with one or more underflow outlets which, when a plurality of underflow outlets are provided, are arranged at different heights along the axial direction of the slurry cyclone 13 and are connected to different desulfurized ash slurrying tanks 11, respectively. The gypsum cyclone 20 is provided with one or more underflow outlets, which, when provided, are arranged at different heights in the axial direction of the gypsum cyclone 20 and are connected to the inlets of different gypsum dewaterers 21, respectively. The gypsum dewatering machine 21 is a vacuum belt dewatering machine or a belt filter press.
The system, its working process includes following step:
the method comprises the following steps: analysis and test of raw materials: analyzing and testing the components of the dry/semi-dry desulfurized fly ash to determine CaSO in the desulfurized fly ash3And the content of various strong alkaline compounds, which is used as the basis for estimating the solid-liquid ratio between the desulfurized fly ash and the waste sulfuric acid in the modification process;
step two: preparing desulfurized mortar: mixing the dry/semi-dry desulfurized fly ash obtained in the first step with water to prepare desulfurized mortar with pH value of more than 8.1, and placing the desulfurized mortar in the desulfurized fly ash pulping tank 11 with continuous stirring;
step three: slurry rotational flow: and (3) feeding the desulfurized mortar in the second step into the slurry cyclone 13 through the slurry pump 12, overflowing into the lye tank 1 and continuously stirring, and returning the underflow to the desulfurized mortar making tank 11. When the slurry cyclone 13 is provided with a plurality of underflow outlets, desulfurized mortar with different impurity contents can be separated and respectively returned to different desulfurized mortar making tanks 11; when the slurry cyclone is provided with a plurality of underflow outlets, the desulfurized mortar with different impurity contents can be separated and respectively returned to different desulfurized mortar making tanks;
step four: raw material acidification: and (3) feeding the material obtained in the third step into the acidification tank 2 through the lye pump 14, feeding the waste sulfuric acid with low contents of heavy metals and organic pollutants, the mass fraction of which is 4-95%, stored in the acid liquor tank 15 into the acidification tank 2 through the acid liquor pump 16, and starting a stirring device of the acidification tank 2 to accelerate the dissolving and reaction processes. Monitoring the pH value change of the acidified slurry in real time, and adjusting the flow ratio of the lye pump 14 and the acid pump 16 to reduce the pH value of the slurry to 2.1-5.8 and stabilize the pH value;
step five: forced oxidation: sending the acidified slurry obtained in the fourth step into the primary aeration tower 5 through the primary feeding pump 17, and starting the primary jet aerator 3 to aerate the acidified slurry. When the primary aeration tower 5 is filled with the slurry, the slurry is fed into the secondary aeration tower 6 through the secondary feed pump 18, and the secondary jet aerator 4 is turned on to aerate the acidified slurry. HSO in the slurry at this point3 -To be protected by O2Oxidation to SO4 2-To release H+Thereby reducing the pH value of the slurry;
step six: SO (SO)2And (3) resorption: due to SO3 2-Will react with excessive H+Combine to form pollutant SO2The acidified slurry in the acidification tank 2, the primary 5 and the secondary aeration tower 6 may have SO2And (4) escaping. Through said first 8, second 9 and third SO2A discharge pipe 10 discharges SO released from the acidified slurry2Introducing into the bottom of the lye tank 1, and treating SO with high alkaline desulfurized mortar2Absorption;
step seven: partial pulp discharge: when the solid content of the acidified slurry in the first-stage 5 and the second-stage aeration tower 6 in the fifth step reaches 6-26%, discharging a part of the slurry through the slurry discharge pump 19, and feeding the discharged slurry into the gypsum cyclone 20 for solid-liquid separation. Before the slurry discharge pump 19 is started, the primary 17 and the secondary feeding pump 18 need to be closed, so that the newly injected acidified slurry is prevented from being directly discharged by the slurry discharge pump 19;
step eight: dehydrating the product: and the underflow of the gypsum cyclone 20 in the step seven enters the gypsum dehydrator 21 for dehydration, and finally, a stabilized gypsum product is obtained. When the gypsum cyclone 20 is provided with a plurality of underflow outlets, gypsum with different particle sizes and qualities can be separated and respectively enter different gypsum dehydrators;
step nine: waste liquor recycling and Mg recovery: the overflow of the gypsum cyclone 20 in the seventh step and the filtrate of the gypsum dewatering machine 21 in the eighth step enter the overflow tank 22, and the liquids can be returned to the first-stage aeration tower 5 in the fifth step for recycling through the circulating pump 23, and Ca (OH) can also be added2Preparation of Mg (OH)2And (3) producing a product, so as to recycle Mg element in the dry/semi-dry desulfurized fly ash obtained in the first step.
The foregoing description of the embodiments is provided to enable any person skilled in the art to make or use the invention sufficiently and effectively. 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 embodiments, and modifications made by those skilled in the art according to the teaching of the present invention should be within the scope of the present invention.
Claims (9)
1. Continuous dry method/semidry process desulfurization ash stabilization processing system, its characterized in that: comprises a desulfurization ash pulping tank, an alkali liquor tank, an acidification tank, a primary aeration tower and a secondary aeration tower which are arranged in sequence; the desulfurization ash pulping tank is connected with the slurry cyclone through a slurry pump, the underflow outlet of the slurry cyclone is connected with the desulfurization ash pulping tank, and the overflow outlet of the slurry cyclone is connected with the lower part of the alkali liquor tank;
the alkali liquor tank is connected with the acidification tank through an alkali liquor pump, the acidification tank is connected with the primary aeration tower through a primary feeding pump, and the primary aeration tower is connected with the secondary aeration tower through a secondary feeding pump; the first-stage aeration tower and the second-stage aeration tower are connected with a gypsum cyclone through a slurry discharge pump, the underflow outlet of the gypsum cyclone is connected with a gypsum dehydrator, and the overflow outlet of the gypsum cyclone is connected with an overflow tank; the overflow tank is connected with the primary aeration tower through a circulating pump; the acid solution tank is connected with the acidification tank through an acid solution pump; the alkaline liquid tank is provided with a gas discharge pipe, and the acidification tank, the primary aeration tower and the secondary aeration tower are respectively provided with a first SO2Discharge pipe, second SO2Discharge pipe, third SO2Discharge pipe, first SO2Discharge pipe, second SO2Discharge pipe, third SO2The discharge pipe is connected with the bottom of the lye tank through a pipeline; a first-stage jet aerator and a second-stage jet aerator are respectively arranged in the first-stage aeration tower and the second-stage aeration tower.
2. The stabilization system of claim 1, wherein: and a filtrate outlet of the gypsum dehydrator is connected with the overflow tank.
3. The stabilization system of claim 1, wherein: the alkali liquor tank, the acidification tank, the primary aeration tower and the secondary aeration tower are all vertical cylinders, the height-diameter ratio is 1.6-16, and liquid level, pH and temperature online monitoring devices are arranged.
4. The stabilization system of claim 1, wherein: the primary jet aerator and the secondary jet aerator have stirring and mixing functions.
5. The stabilization system of claim 1, wherein: the gas discharge pipe is provided with SO2Provided is an online monitoring device.
6. The stabilization system of claim 1, wherein: and stirring devices are arranged in the desulfurization ash pulping tank, the alkali liquor tank and the acidification tank.
7. The stabilization system of claim 1, wherein: the lye pump, the acid liquid pump, the first-stage feeding pump, the second-stage feeding pump, the slurry discharging pump and the circulating pump all have metering functions.
8. The stabilization system of claim 1, wherein: the slurry cyclone is provided with a plurality of underflow outlets which are arranged at different heights along the axial direction of the slurry cyclone and are respectively connected with different desulfurization ash pulping tanks;
the gypsum cyclone is provided with a plurality of underflow outlets which are arranged along the axial direction of the gypsum cyclone at different heights and are respectively connected with inlets of different gypsum dewaterers.
9. The stabilization system of claim 1, wherein: the gypsum dehydrator is a vacuum belt dehydrator or a belt filter press.
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