CN209934147U - Gypsum slurry concentration and separation system - Google Patents
Gypsum slurry concentration and separation system Download PDFInfo
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- CN209934147U CN209934147U CN201920207505.3U CN201920207505U CN209934147U CN 209934147 U CN209934147 U CN 209934147U CN 201920207505 U CN201920207505 U CN 201920207505U CN 209934147 U CN209934147 U CN 209934147U
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Abstract
The embodiment of the utility model provides a relate to the environmental protection equipment field, disclose a concentrated piece-rate system of gypsum thick liquid, include: the system comprises a pre-settling tank, a gypsum slurry input device, a clear liquid discharge device, a pre-settling tank circulating device and a concentrated slurry output device. The gypsum slurry input device is used for conveying gypsum slurry to the pre-settling tank. The pre-settling tank is used for containing gypsum slurry. And the clear liquid discharging device is used for discharging clear liquid on the upper layer of the gypsum slurry in the pre-settling tank after the gypsum slurry is conveyed to the pre-settling tank by the gypsum slurry input device. The pre-settling tank circulating device is used for mixing the residual gypsum slurry in the pre-settling tank after the clear liquid on the upper layer of the gypsum slurry in the pre-settling tank is discharged by the clear liquid discharging device. And the concentrated slurry output device is used for outputting the slurry mixed by the pre-settling tank circulating device from the pre-settling tank. The utility model provides a gypsum slurry concentration piece-rate system can carry out the concentrated separation to the gypsum slurry of this system, promotes its quality and exports again, makes it can possess better service condition.
Description
Technical Field
The embodiment of the utility model provides a relate to the environmental protection equipment field, in particular to gypsum slurry concentration piece-rate system field.
Background
The Flue Gas Desulfurization (FGD) system adopts limestone wet flue gas desulfurization technology and utilizes limestone slurry to absorb SO in flue gas in an absorption tower2By the physical and chemical process, gypsum-based by-products are produced. The hot flue gas entering the absorption tower is cooled and washed by the reverse spraying slurry, and SO in the flue gas2Absorbing with limestone slurry to generate hydrogen sulfite radical (HSO)3﹣)。HSO3﹣The air blown by the oxidation fan is oxidized into sulfate radical (SO 4)2-)，SO42-With calcium ions (Ca) in the slurry2+) Reaction to produce calcium sulfate (CaSO)4)，CaSO4Further crystallizing to obtain gypsum (CaSO)4·2H2O), most of the impurities such as Cl, F and dust in the flue gas are also removed in the absorption tower. The concentration of the slurry in the absorption tower is controlled to be 13-20%, when the concentration of the slurry in the absorption tower reaches 20%, the slurry is discharged to a dehydration system, one part of the absorbent slurry containing gypsum, dust and impurities is discharged into the gypsum dehydration system, and the impurities overflow from the wastewater cyclone station, pass through a wastewater tank and are pumped to a wastewater treatment system through a wastewater pump. When the slurry concentration of the absorption tower is lower than 13%, the dewatering system should be stopped.
A two-stage cyclone station is arranged in the existing FGD (flue gas desulfurization) system, and gypsum slurry with the concentration of 13-20% in an absorption tower is conveyed to a dehydration system through a gypsum discharge pump. The slurry is concentrated to underflow with the concentration of about 55 percent by a gypsum rotational flow station and automatically flows to a gypsum dewatering belt machine for dewatering, and the overflow slurry is sent to a wastewater rotational flow station by a wastewater rotational flow station feeding box. The overflow of the wastewater cyclone station is sent to a wastewater treatment system by a wastewater pump through a wastewater tank, and the underflow enters a filtrate tank. The gypsum slurry after concentration and separation in the filtrate water tank is returned to the absorption tower through a filtrate water pump.
The inventor finds that, because the concentration of the slurry conveyed to the absorption tower of the dehydration system is required to be more than 13%, in the conventional FGD system, when the concentration of the gypsum slurry in the absorption tower is too low, the gypsum slurry cannot be concentrated and separated by the two-stage cyclone station. When the impurities such as Cl, F, dust and the like in the flue gas or the impurities in the limestone are enriched in a large amount, the quality of the slurry in the absorption tower is deteriorated; or when the water balance of the low-load desulfurization system is damaged, the external discharge capacity of the wastewater cannot be increased.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide a gypsum thick liquid concentration piece-rate system can carry out the concentrated separation to the gypsum thick liquid of this system, promotes its quality and exports again, makes it can possess better service condition.
In order to solve the above technical problem, an embodiment of the utility model provides a concentrated piece-rate system of gypsum thick liquid, include: the system comprises a pre-settling tank, a gypsum slurry input device, a clear liquid discharge device, a pre-settling tank circulating device and a concentrated slurry output device; the gypsum slurry input device is used for conveying gypsum slurry to the pre-settling tank; the pre-settling tank is used for accommodating gypsum slurry; the clear liquid discharging device is used for discharging clear liquid on the upper layer of the gypsum slurry in the pre-settling tank after the gypsum slurry is conveyed to the pre-settling tank by the gypsum slurry input device; the pre-settling tank circulating device is used for mixing the residual gypsum slurry in the pre-settling tank after the clear liquid at the upper layer of the gypsum slurry in the pre-settling tank is discharged by the clear liquid discharging device; and the concentrated slurry output device is used for outputting the slurry mixed by the pre-settling tank circulating device from the pre-settling tank.
The utility model discloses embodiment provides a concentrated piece-rate system of gypsum thick liquid with caisson, gypsum thick liquid input device, clear liquid discharging equipment, caisson circulating device and concentrated thick liquid output device in advance for prior art. Wherein the gypsum slurry feed means can feed the gypsum slurry to the pre-settling tank. The pre-settling tank may contain gypsum slurry. The clear liquid discharging device can discharge the clear liquid on the upper layer of the gypsum slurry in the pre-settling tank after the gypsum slurry is conveyed to the pre-settling tank by the gypsum slurry input device. The circulation device of the pre-settling tank can mix the residual gypsum slurry in the pre-settling tank after the clear liquid at the upper layer of the gypsum slurry in the pre-settling tank is discharged by the clear liquid discharge device. The concentrated slurry output device can output the slurry mixed by the pre-settling tank circulating device from the pre-settling tank. Therefore, the gypsum slurry concentration and separation system can realize the purpose of concentrating and separating the gypsum slurry, can convert the gypsum slurry with lower concentration into the gypsum slurry with higher quality, and then output the gypsum slurry, so that the gypsum slurry can have better use conditions.
In addition, N discharge ports are formed in the preliminary caisson according to a preset height, and N is a natural number greater than or equal to 2; the clear liquid discharge device is N discharge pipelines for guiding clear liquid on the upper layer of the gypsum slurry to be discharged from each discharge port. The structure can discharge the clear liquid on the upper layer of the gypsum slurry from the discharge ports with different heights, and different discharge requirements are met.
In addition, each discharge pipeline shares a power source, so that the cost of the pipeline is saved while the discharge pipeline normally operates.
In addition, the gypsum slurry concentration and separation system also comprises an observation tank, and each discharge pipeline is provided with a branch for conveying the gypsum slurry in the pre-settling tank into the observation tank. Whether the discharge of the gypsum slurry is continued can be judged according to the turbidity degree of the supernatant liquid of the discharged gypsum slurry observed by the observation tank.
In addition, the N is 3, the height intervals of the discharge ports are the same, the structure is relatively simple, and the discharge pipelines have different discharge heights.
In addition, the pre-settling tank circulating device includes: the device comprises an inner pipeline, an outer pipeline, a pulse pump and a pulse nozzle; the outer pipeline is arranged outside the pre-caisson; the inner pipeline is arranged in the pre-caisson and is respectively connected with the outer pipeline and the pulse nozzle; the pulse pump is arranged on the outer pipeline and used for driving the gypsum slurry in the pre-settling tank to circulate; the pulse nozzle is used for fully mixing the gypsum slurry. The pre-settling tank circulation device enables the gypsum slurry to be fully mixed.
In addition, the pulse nozzle is arranged at the bottom of the pre-settling tank, so that the mixing effect of the gypsum slurry is better.
In addition, the height position of the pulse nozzle is below the height position of the pulse pump, so that the gypsum slurry has a good mixing effect.
In addition, the gypsum slurry conveyed by the gypsum slurry input device comes from an absorption tower of a flue gas desulfurization system, and the concentrated slurry output device outputs the gypsum slurry to the absorption tower of the flue gas desulfurization system, so that the problem of low gypsum slurry concentration of the absorption tower of the flue gas desulfurization system can be solved.
In addition, the pre-settling tank circulating device and the concentrated slurry output device share one power source, so that the equipment cost can be saved under the condition that the pre-settling tank circulating device and the concentrated slurry output device normally operate.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
FIG. 1 is a schematic view of a gypsum slurry concentration and separation system according to a first embodiment of the present invention;
FIG. 2 is a schematic view of a gypsum slurry concentration and separation system according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will explain in detail each embodiment of the present invention with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in various embodiments of the invention, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
The utility model discloses a first embodiment relates to a gypsum thick liquid concentration piece-rate system, include: the system comprises a pre-settling tank 1, a gypsum slurry input device 2, a clear liquid discharge device 3, a pre-settling tank circulating device 4 and a concentrated slurry output device 5. Wherein the gypsum slurry feeding device 2 comprises a feed pump 10 and a feed pipe for feeding gypsum slurry from the outside into the pre-settling tank 1. The pre-caisson 1 is used to contain gypsum slurry. The clear liquid discharging device 3 is used for discharging clear liquid on the upper layer of the gypsum slurry in the pre-settling tank 1 after the gypsum slurry is conveyed to the pre-settling tank 1 by the gypsum slurry input device 2. The preliminary caisson circulating means 4 is used for mixing the gypsum slurry remaining in the preliminary caisson 1 after the clear liquid in the upper layer of the gypsum slurry in the preliminary caisson 1 is discharged by the clear liquid discharging means 3. The concentrated slurry output device 5 is used for outputting the slurry mixed by the pre-settling tank circulating device 4 from the pre-settling tank 1.
Specifically, three discharge ports are formed in the pre-settling tank 1 at different heights, in the embodiment, the discharge ports are formed at the positions of the pre-settling tank 1 at the heights of 4 meters, 5 meters and 6 meters respectively, the height intervals of the discharge ports are the same, and the structure is relatively simple. Clear liquid discharging equipment 3 is specifically three discharge lines that the clear liquid of guide gypsum thick liquid upper strata was discharged from three discharge ports, and three discharge lines all set up the valve, can make the clear liquid of gypsum thick liquid upper strata discharge from the discharge port of different heights, satisfy different emission demands. Of course, the number of discharge ports may be other natural numbers greater than or equal to 2, depending on the actual application.
It is worth mentioning that three discharge pipelines share one power source 6, namely one discharge pump, so that the cost of the pipelines is saved while the discharge pipelines normally operate. In addition, the gypsum slurry concentration and separation system further comprises an observation tank 7, the three discharge pipelines are provided with a branch for conveying the gypsum slurry in the pre-settling tank 1 to the observation tank 7, and valves are required to be arranged on the branches, so that whether the gypsum slurry is continuously discharged or not can be judged according to the turbidity degree of the supernatant of the discharged gypsum slurry observed by the observation tank 7.
The preliminary caisson circulating device 4 includes: inner pipeline, outer pipeline, pulse pump 8, pulse nozzle 9. Wherein, the outer pipeline is arranged outside the pre-caisson 1 and is provided with a valve; the inner pipeline is arranged in the pre-settling tank 1 and is respectively connected with the outer pipeline and the pulse nozzle 9; the pulse pump 8 is arranged on the outer pipeline and used for driving the gypsum slurry in the pre-settling tank 1 to circulate; the pulse nozzle 9 is used to mix the gypsum slurry thoroughly.
Here, the pulse nozzle 9 is provided at the bottom of the preliminary sedimentation tank 1, so that the gypsum slurry can be sufficiently mixed, and the mixing effect is good. The height position that pulse nozzle 9 was located is located the height position that pulse pump 8 was located under, and pulse pump 8 can be with the gypsum thick liquid of preliminary sedimentation case 1 bottom recirculation to preliminary sedimentation case 1 top, and consequently, the mixing effect of gypsum thick liquid is better, and this preliminary sedimentation case circulating device 4 can make the gypsum thick liquid intensive mixing.
It should be noted that, in this embodiment, the pre-settling tank circulating device 4 and the concentrated slurry output device 5 share one power source, which is the pulse pump 8, and the concentrated slurry output device 5 is further provided with a valve for controlling the concentrated slurry output device 5. Therefore, under the condition that the pre-settling tank circulating device 4 and the concentrated slurry output device 5 normally operate, the equipment cost can be saved.
After the gypsum slurry is input into the pre-settling tank 1 through the gypsum slurry input device 2, due to the action of gravity, solids such as gypsum particles in the gypsum slurry slowly settle at the bottom of the pre-settling tank 1, the upper part of the pre-settling tank 1 is a clear solution, and the gypsum slurry is subjected to the action of gravity to complete concentration and separation in the pre-settling tank 1. After a period of time, the valves on the branch of the discharge pipeline are opened from top to bottom in sequence, and the turbidity degree of the clear liquid on the upper layer of the gypsum slurry is observed in the observation tank 7. The method comprises the steps of firstly opening a valve on a discharge pipeline branch at the position of 6 m in height of a pre-settling tank 1, closing the valve on the discharge pipeline branch if slurry in an observation tank 7 is turbid, executing the operation again after a period of time until the slurry in the observation tank 7 is clear, opening the valve on the discharge pipeline at the position of 6 m in height, and starting a power source 6 to send clear liquid on the upper layer of gypsum slurry to a waste water tank. Similar operation is performed until the discharge line at the height of 4 m of the bottommost pre-caisson 1 is discharged, and the valve of the discharge line at the height of 4 m of the pre-caisson 1 is closed. And starting the pulse pump 8, opening a valve of the pipeline outside the pre-settling tank circulating device 4, keeping the valve of the concentrated slurry output device 5 in a closed state, and thoroughly mixing the residual clear liquid and gypsum particles in the pre-settling tank 1 into gypsum slurry through the slurry pulse effect sprayed by the pulse nozzle 9. And opening a valve of the concentrated slurry output device 5 after a period of time to output the gypsum slurry in the pre-settling tank 1 through the concentrated slurry output device 5.
Compared with the prior art, the embodiment provides a gypsum slurry concentration and separation system which is provided with a pre-settling tank 1, a gypsum slurry input device 2, a clear liquid discharge device 3, a pre-settling tank circulating device 4 and a concentrated slurry output device 5. Wherein the gypsum slurry feeding device 2 can feed the gypsum slurry to the preliminary tank 1. The pre-caisson 1 can contain gypsum slurry. The clear liquid discharging device 3 may discharge the clear liquid on the upper layer of the gypsum slurry in the preliminary settling tank 1 after the gypsum slurry is transferred to the preliminary settling tank 1 by the gypsum slurry feeding device 2. The preliminary caisson circulating means 4 may mix the gypsum slurry remaining in the preliminary caisson 1 after the clear liquid in the upper layer of the gypsum slurry in the preliminary caisson 1 is discharged by the clear liquid discharging means 3. The concentrated slurry output device 5 can output the slurry mixed by the pre-settling tank circulating device 4 from the pre-settling tank 1. Therefore, the gypsum slurry concentration and separation system can realize the purpose of concentrating and separating the gypsum slurry, can convert the gypsum slurry with lower concentration into the gypsum slurry with higher quality, and then output the gypsum slurry, so that the gypsum slurry can have better use conditions.
The second embodiment of the present invention relates to a gypsum slurry concentration and separation system, and the second embodiment is further improved on the gypsum slurry concentration and separation system of the first embodiment, and the main improvement lies in: in the second embodiment, as shown in fig. 2, the gypsum slurry fed by the gypsum slurry feeding device 2 is fed from the absorption tower 11 of the flue gas desulfurization system, and the concentrated slurry feeding device 5 feeds the gypsum slurry to the absorption tower 11 of the flue gas desulfurization system, so that the problem of low gypsum slurry concentration in the absorption tower 11 of the flue gas desulfurization system can be solved.
Specifically, the gypsum slurry conveyed by the gypsum slurry input device 2 comes from an absorption tower 11 of a flue gas desulfurization system, the gypsum slurry in the absorption tower enters a pre-settling tank 1 for pre-settling, solids such as gypsum particles in the gypsum slurry slowly settle at the bottom of the pre-settling tank 1 due to the action of gravity in the pre-settling tank 1, the upper part of the pre-settling tank 1 is a clear solution, and the gypsum slurry is subjected to the action of gravity in the pre-settling tank 1 to complete concentration and separation. After a period of time, the valves on the branch of the discharge pipeline are opened from top to bottom in sequence, and the turbidity degree of the clear liquid on the upper layer of the gypsum slurry is observed in the observation tank 7. The method comprises the steps of firstly opening a valve on a discharge pipeline branch at the position of 6 m in height of a pre-settling tank 1, closing the valve on the discharge pipeline branch if slurry in an observation tank 7 is turbid, executing the operation again after a period of time until the slurry in the observation tank 7 is clear, opening the valve on the discharge pipeline at the position of 6 m in height, and starting a power source 6 to send clear liquid on the upper layer of gypsum slurry to a waste water tank. Similar operation is performed until the discharge line at the height of 4 m of the bottommost pre-caisson 1 is discharged, and the valve of the discharge line at the height of 4 m of the pre-caisson 1 is closed. And starting the pulse pump 8, opening a valve of the pipeline outside the pre-settling tank circulating device 4, keeping the valve of the concentrated slurry output device 5 in a closed state, and thoroughly mixing the residual clear liquid and gypsum particles in the pre-settling tank 1 into gypsum slurry through the slurry pulse effect sprayed by the pulse nozzle 9. After a while, the valve of the concentrated slurry outlet means 5 is opened to return the gypsum slurry in the preliminary caisson 1 to the absorption tower 11 to serve as gypsum seed crystals in the absorption tower 11.
In the present embodiment, even when the gypsum slurry in the absorption tower 11 has a low density, the gypsum slurry can be concentrated and separated by the gypsum slurry concentration and separation system, and then the mass balance of the slurry in the absorption tower 11 is maintained by the desulfurization wastewater treatment system, thereby ensuring the quality of the slurry in the absorption tower 11. After the gypsum slurry in the pre-settling tank 1 returns to the absorption tower 11, the gypsum slurry can be used as gypsum crystal seeds in the absorption tower 11, so that the quality of the gypsum is improved. The clear liquid on the upper layer of the gypsum slurry separated by the gypsum slurry concentration and separation system has very low solid content, the consumption of wastewater treatment medicines is greatly reduced after the clear liquid enters the wastewater treatment system, the treated wastewater is clear in quality and less in suspended matters, and the clear liquid can be directly used as spray water of a coal yard in a plant area.
The above embodiments are divided for convenience of description, and should not constitute any limitation to the specific implementation manner of the present invention, and the embodiments may be mutually combined and referred to without contradiction.
It will be understood by those skilled in the art that the foregoing embodiments are specific examples of the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in its practical application.
Claims (10)
1. A gypsum slurry concentration and separation system, comprising: the system comprises a pre-settling tank, a gypsum slurry input device, a clear liquid discharge device, a pre-settling tank circulating device and a concentrated slurry output device;
the gypsum slurry input device is used for conveying gypsum slurry to the pre-settling tank;
the pre-settling tank is used for accommodating gypsum slurry;
the clear liquid discharging device is used for discharging clear liquid on the upper layer of the gypsum slurry in the pre-settling tank after the gypsum slurry is conveyed to the pre-settling tank by the gypsum slurry input device;
the pre-settling tank circulating device is used for mixing the residual gypsum slurry in the pre-settling tank after the clear liquid at the upper layer of the gypsum slurry in the pre-settling tank is discharged by the clear liquid discharging device;
and the concentrated slurry output device is used for outputting the slurry mixed by the pre-settling tank circulating device from the pre-settling tank.
2. The gypsum slurry concentrating and separating system according to claim 1, wherein the pre-settling tank is provided with N discharge ports according to a preset height, wherein N is a natural number greater than or equal to 2; the clear liquid discharge device is N discharge pipelines for guiding clear liquid on the upper layer of the gypsum slurry to be discharged from each discharge port.
3. The gypsum slurry concentration and separation system of claim 2, wherein each discharge line shares a power source.
4. The gypsum slurry concentration and separation system of claim 2, further comprising an observation tank, wherein each discharge line has a branch for conveying the gypsum slurry in the pre-settling tank into the observation tank.
5. The gypsum slurry concentration and separation system of claim 2, wherein N is 3 and the height intervals of the discharge openings are the same.
6. The gypsum slurry concentration and separation system of claim 1, wherein the pre-caisson circulation means comprises: the device comprises an inner pipeline, an outer pipeline, a pulse pump and a pulse nozzle;
the outer pipeline is arranged outside the pre-caisson;
the inner pipeline is arranged in the pre-caisson and is respectively connected with the outer pipeline and the pulse nozzle;
the pulse pump is arranged on the outer pipeline and used for driving the gypsum slurry in the pre-settling tank to circulate;
the pulse nozzle is used for fully mixing the gypsum slurry.
7. The gypsum slurry concentration and separation system of claim 6, wherein the pulse nozzle is disposed at the bottom of the pre-settling tank.
8. The gypsum slurry concentration and separation system of claim 6, wherein the pulse nozzle is at a height below the height of the pulse pump.
9. The gypsum slurry concentration and separation system of claim 1, wherein the gypsum slurry input device delivers gypsum slurry from an absorption tower of a flue gas desulfurization system, and the concentrated slurry output device delivers gypsum slurry to the absorption tower of the flue gas desulfurization system.
10. The gypsum slurry concentration and separation system of claim 1, wherein the pre-caisson circulation means and the concentrated slurry outlet means share a single power source.
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| CN109821279A (en) * | 2019-02-18 | 2019-05-31 | 上海申欣环保实业有限公司 | Gypsum slurries concentrated separation system |
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| CN109821279A (en) * | 2019-02-18 | 2019-05-31 | 上海申欣环保实业有限公司 | Gypsum slurries concentrated separation system |
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