CN217698673U - Wet desulphurization tower device for optimally controlling water balance and gypsum dehydration - Google Patents
Wet desulphurization tower device for optimally controlling water balance and gypsum dehydration Download PDFInfo
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- CN217698673U CN217698673U CN202123087086.0U CN202123087086U CN217698673U CN 217698673 U CN217698673 U CN 217698673U CN 202123087086 U CN202123087086 U CN 202123087086U CN 217698673 U CN217698673 U CN 217698673U
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Abstract
The utility model discloses a wet desulphurization tower device for optimally controlling water balance and gypsum dehydration, which comprises a desulphurization tower, a slurry supply system, a gypsum removal system, a water charging system, a drainage system and a control device; the slurry supply system comprises a slurry circulating pump, a limestone slurry preparation device, a slurry circulating pipeline and a spraying device; the water replenishing system is arranged at the upper part of the desulfurizing tower and is used for replenishing water to the desulfurizing tower; the gypsum removal system comprises a first gypsum discharge pipeline, a gypsum discharge variable frequency pump, a second gypsum discharge pipeline, a slurry concentration meter, a hydrocyclone and a gypsum backflow pipeline; the drainage system comprises a belt dehydrator, a filtrate return pipeline and a wastewater discharge pipeline; the control device is connected with the slurry circulating pump, the gypsum discharge variable frequency pump, the slurry concentration meter and the water replenishing system in a wired or wireless mode; the device has the advantages of high response speed and high desulfurization efficiency, and improves the response capability of the wet desulfurization tower device to the change of water balance.
Description
Technical Field
The embodiment of the utility model belongs to the production field of steam power plant, more specifically relates to a water balance and gypsum dehydration optimal control's wet flue gas desulfurization tower device.
Background
In order to control SO2 generated by coal burning and protect the ecological environment, most coal burning power plants are provided with a limestone-gypsum wet flue gas desulfurization system at present. Because the evaporation loss of the flue gas in the water loss of the desulfurization system accounts for more than 90 percent of the total loss, the factors determining the water loss are the original flue gas components, temperature, humidity and flue gas volume, and the desulfurization operation does not have other adjusting means except a plurality of rows of desulfurization waste water to control the water loss of the desulfurization system. Limestone-gypsum wet desulphurization adopts limestone (lime) slurry as an absorbent to absorb sulfur dioxide in flue gas, and generates gypsum as a byproduct.
The effective and reasonable control of water balance is the premise that the limestone-gypsum wet desulphurization system can normally operate, and the desulphurization system can stably operate only when the water inlet and the water outlet of the desulphurization system are basically balanced. If the water inflow of the desulfurization system is less and the water outflow is more, the system needs to be supplemented with water, so that the water consumption of the system is increased; if the desulfurization system has more water inlet and less water outlet, the liquid level of the desulfurization tower can continuously rise, the desulfurization system is seriously collapsed, and a large amount of wastewater must be discharged. The desulfurization wastewater contains a large amount of impurities, and supersaturated sulfite, sulfate, heavy metals and the like are mainly contained in the wastewater.
Therefore, on the premise of ensuring the efficient and stable operation of the wet desulphurization device, the water balance of the system and the gypsum dehydration system need to be optimally controlled so as to ensure the safe and economic operation of the desulphurization system.
SUMMERY OF THE UTILITY MODEL
To the above defect of prior art or improve the demand, the utility model provides a water balance and gypsum dehydration optimal control's wet flue gas desulfurization tower device is in order to carry out optimal control to system's water balance and gypsum dewatering system to guarantee desulfurization system safety, economic operation.
A wet desulphurization tower device for optimally controlling water balance and gypsum dehydration comprises a desulphurization tower, a slurry supply system, a gypsum removal system, a water replenishing system, a water draining system and a control device;
the slurry supply system comprises a slurry circulating pump, a limestone slurry preparation device, a slurry circulating pipeline and a spraying device;
the water replenishing system is arranged at the upper part of the desulfurizing tower and is used for replenishing water to the desulfurizing tower;
the gypsum removal system comprises a first gypsum discharge pipeline, a gypsum discharge variable frequency pump, a second gypsum discharge pipeline, a slurry concentration meter, a hydrocyclone and a gypsum backflow pipeline; one end of the first gypsum discharge pipeline is communicated with the bottom of the desulfurization tower, and the other end of the first gypsum discharge pipeline is communicated with the feed end of the gypsum discharge variable frequency pump; one end of a second gypsum discharge pipeline is communicated with the material outlet end of the gypsum discharge variable frequency pump, the other end of the second gypsum discharge pipeline is communicated with the material inlet end of the hydrocyclone, the slurry concentration meter is arranged on the second gypsum discharge pipeline, one end of a gypsum reflux pipeline is communicated with the desulfurizing tower, and the other end of the gypsum reflux pipeline is communicated with the upper output end of the hydrocyclone;
the drainage system is arranged at the lower end of the hydrocyclone and is used for realizing filtrate circulation and waste liquid discharge;
the control device is connected with the slurry circulating pump, the gypsum discharge variable-frequency pump, the slurry concentration meter and the water replenishing system in a wired or wireless mode.
Furthermore, the spraying device is a plurality of pipe systems with spray heads.
Further, the water supplementing system comprises a washing water pump, a demister and a liquid level meter, the washing water pump is communicated with the demister through a washing water inlet of the demister, and the liquid level meter is arranged inside the desulfurizing tower; the liquid level meter and the flushing water pump are connected with the control device in a wired or wireless mode.
Furthermore, drainage system includes belt hydroextractor, filtrating return line, waste water discharge pipe, and belt hydroextractor's input and hydrocyclone's lower part output communicate with each other, and filtrating return line one end communicates with each other bottom the desulfurizing tower, and the other end links to each other with belt hydroextractor's filtrating export, and waste water discharge pipe communicates with each other with belt hydroextractor's waste water outlet.
Furthermore, a PH value detector is arranged in the desulfurizing tower, and the PH value of the slurry in the absorption tower is controlled and adjusted by the flow of limestone slurry input into the absorption tower.
Furthermore, a flue gas detector is arranged at the outlet flue gas of the desulfurizing tower.
Generally, through the utility model discloses an above technical scheme who thinks compares with prior art, can gain following beneficial effect:
(1) The utility model discloses a water balance and gypsum dehydration optimal control's wet flue gas desulfurization tower device, response speed is fast: the gypsum discharge variable frequency pump and the slurry concentration meter are arranged, so that the discharge flow can be adjusted in real time according to the slurry density, and the response capability of the wet desulphurization tower device to the water balance change is improved.
(2) The utility model discloses a water balance and gypsum dehydration optimal control's wet flue gas desulfurization tower device, the desulfurization is efficient: because thick liquid density, PH can influence desulfurization efficiency, through the PH value detector, accurate control desulfurizing tower thick liquid density and PH can prevent that the PH value from overshoot to improve desulfurization efficiency.
(3) The utility model discloses a water balance and gypsum dehydration optimal control's wet flue gas desulfurization tower device, gypsum discharge pump discharge flow can set for the flow according to thick liquid density and liquid level dynamic condition to with SO 2's in flue gas volumn and the flue gas concentration, the concentration and the supply capacity of limestone slurry form combined control system, improve the response ability of wet flue gas desulfurization tower device to the water balance change.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
in the figure: 1. inlet flue gas; 2. an oxidation slurry pond; 3. a slurry circulating pump; 4. a limestone slurry preparation device; 5. a spraying device; 6. a demister; 7. a hydrocyclone; 8. a vacuum belt dehydrator; 9. gypsum; 10. waste water; 11. filtering the solution; 12. a desulfurizing tower; 13. washing water of the demister; 14. outlet flue gas; 15. a slurry concentration meter; 16. discharging the gypsum by a variable frequency pump; 17. a liquid level sensor; 18. a slurry circulation pipe; 19-a gypsum discharge conduit; a No. 20-II gypsum discharge pipeline; 21-gypsum return line; 22-a washing water pump; 23-a control device; 24-a pH value detector; 25-smoke detector.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
Referring to fig. 1, a wet desulfurization tower apparatus for optimally controlling water balance and gypsum dehydration includes a desulfurization tower 12, a slurry supply system, a gypsum removal system, a water charging system, a water discharging system and a control device;
the slurry supply system comprises a slurry circulating pump 3, a limestone slurry preparation device 4, a slurry circulating pipeline 18 and a spraying device 5; specifically, the spraying device 5 is a plurality of pipe systems with spray heads.
The water supplementing system is arranged at the upper part of the desulfurizing tower 12 and is used for supplementing water to the desulfurizing tower; the water supplementing system comprises a washing water pump 22, a demister 6 and a liquid level meter 17, wherein the washing water pump 22 is communicated with the demister 6 through a demister washing water inlet 13, and the liquid level meter 17 is arranged inside the desulfurizing tower 12; the liquid level meter 17 and the washing water pump 22 are connected with the control device in a wired or wireless mode.
The gypsum removal system comprises a first gypsum discharge pipeline 19, a gypsum discharge variable frequency pump 16, a second gypsum discharge pipeline 20, a slurry concentration meter 15, a hydrocyclone 7 and a gypsum return pipeline 21; one end of the first gypsum discharge pipeline 19 is communicated with the bottom of the desulfurizing tower 12, and the other end is communicated with the feed end of the gypsum discharge variable frequency pump 16; one end of a second gypsum discharge pipeline 20 is communicated with the discharge end of the gypsum discharge variable frequency pump 16, the other end of the second gypsum discharge pipeline is communicated with the feed end of the hydrocyclone 7, the slurry concentration meter 15 is arranged on the second gypsum discharge pipeline 20, one end of a gypsum return pipeline 21 is communicated with the desulfurizing tower 12, and the other end of the gypsum return pipeline is communicated with the upper output end of the hydrocyclone 7;
the drainage system is arranged at the lower end of the hydrocyclone 7 and is used for realizing filtrate circulation and waste liquid discharge; the drainage system comprises a belt dehydrator 8, a filtrate return pipeline 11 and a wastewater discharge pipeline 10, wherein the input end of the belt dehydrator 8 is communicated with the output end of the lower part of the hydrocyclone 7, one end of the filtrate return pipeline 11 is communicated with the bottom of the desulfurizing tower 12, the other end of the filtrate return pipeline is connected with a filtrate outlet of the belt dehydrator 8, and the wastewater discharge pipeline 10 is communicated with a wastewater outlet of the belt dehydrator 8.
The control device is connected with the slurry circulating pump 3, the gypsum discharge variable frequency pump 16, the slurry concentration meter 15 and the water supplementing system in a wired or wireless mode. And a flue gas detector 25 is arranged at the outlet flue gas 14 of the desulfurizing tower 12.
A PH value detector 24 is arranged in the desulfurizing tower 12, and the PH value of the slurry in the absorption tower is adjusted and controlled by the flow of limestone slurry input into the absorption tower.
The slurry density control mainly depends on the control of a gypsum discharge system, and the slurry density can be controlled by adopting various single-loop closed-loop intermittent gypsum discharge system control systems.
The water supplementing system is controlled by the liquid level of the slurry pool of the absorption tower, and is realized by adjusting the process water quantity entering the absorption tower, namely the flushing water quantity of the demister, namely by controlling the flushing interval time of the demister 6.
Generally, the water inlet amount is adjusted by a water level deviation signal, the hysteresis is large, and the adjusting speed is slow. The drainage system is controlled by controlling the discharge amount of waste water.
In the above scheme, the gypsum removal can be used for controlling the density of the slurry by the following three ways:
firstly, install the thick liquid concentration meter through the export pipeline of thick liquid circulating pump or gypsum thick liquid discharge pump, according to the difference control gypsum thick liquid delivery pump of detected value and setting value open and close.
And secondly, detecting and comparing a difference value to control the opening and closing of a gypsum delivery pump and a valve according to the mass balance relation between the limestone slurry amount and the gypsum slurry amount flowing out of the absorption tower.
And thirdly, controlling the discharge amount of the gypsum slurry by the slurry concentration, the limestone slurry flow and the liquid level of the absorption tower.
In the above scheme, the SO2 concentration that the interior thick liquid pH value of absorption tower passes through boiler load and air supply volume and check is as feedforward control, combines together to control desulfurizing tower body PH with PH feedback control to improve the response ability of wet flue gas desulfurization tower device to flue gas load and SO2 concentration change.
In the above scheme, the water supplementing system takes the smoke amount as a pre-compensation signal for water level adjustment, and is used for overcoming the larger inertia of the liquid level adjustment so as to accelerate the adjustment speed.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. The utility model provides a water balance and gypsum dehydration optimal control's wet flue gas desulfurization tower device, includes desulfurizing tower (12), its characterized in that: the system also comprises a slurry supply system, a gypsum removal system, a water supplementing system, a drainage system and a control device;
the slurry supply system comprises a slurry circulating pump (3), a limestone slurry preparation device (4), a slurry circulating pipeline (18) and a spraying device (5);
the water supplementing system is arranged at the upper part of the desulfurizing tower (12) and is used for supplementing water to the desulfurizing tower;
the gypsum removal system comprises a first gypsum discharge pipeline (19), a gypsum discharge variable frequency pump (16), a second gypsum discharge pipeline (20), a slurry concentration meter (15), a hydrocyclone (7) and a gypsum backflow pipeline (21); one end of the first gypsum discharge pipeline (19) is communicated with the bottom of the desulfurizing tower (12), and the other end of the first gypsum discharge pipeline is communicated with the feed end of a gypsum discharge variable frequency pump (16); one end of a second gypsum discharge pipeline (20) is communicated with the discharge end of the gypsum discharge variable frequency pump (16), the other end of the second gypsum discharge pipeline is communicated with the feed end of the hydrocyclone (7), a slurry concentration meter (15) is arranged on the second gypsum discharge pipeline (20), one end of a gypsum reflux pipeline (21) is communicated with the desulfurizing tower (12), and the other end of the gypsum reflux pipeline is communicated with the upper output end of the hydrocyclone (7);
the drainage system is arranged at the lower end of the hydrocyclone (7) and is used for realizing filtrate circulation and waste liquid discharge;
the control device is connected with the slurry circulating pump (3), the gypsum discharge variable frequency pump (16), the slurry concentration meter (15) and the water supplementing system in a wired or wireless mode.
2. The wet desulfurization tower apparatus for optimal control of water balance and gypsum dehydration according to claim 1, characterized in that the spraying device (5) is a plurality of piping systems with spray nozzles.
3. The wet desulphurization tower apparatus for optimally controlling water balance and gypsum dehydration according to claim 1, wherein the water supplementing system comprises a washing water pump (22), a demister (6) and a liquid level meter (17), the washing water pump (22) is communicated with the demister (6) through a demister washing water inlet (13), and the liquid level meter (17) is arranged inside the desulphurization tower (12); the liquid level meter (17) and the flushing water pump (22) are connected with the control device in a wired or wireless mode.
4. The wet desulfurization tower apparatus for optimal control of water balance and gypsum dehydration according to claim 1, wherein the drainage system comprises a belt dehydrator (8), a filtrate return line (11), and a wastewater discharge line (10), wherein an input end of the belt dehydrator (8) is communicated with an output end of a lower portion of the hydrocyclone (7), one end of the filtrate return line (11) is communicated with a bottom of the desulfurization tower (12), the other end of the filtrate return line is connected with a filtrate outlet of the belt dehydrator (8), and the wastewater discharge line (10) is communicated with a wastewater outlet of the belt dehydrator (8).
5. The wet desulfurization tower apparatus for optimal control of water balance and gypsum dehydration according to claim 1, characterized in that a pH detector (24) is disposed inside the desulfurization tower (12).
6. The wet desulfurization tower apparatus for optimal control of water balance and gypsum dehydration according to claim 1, characterized in that a flue gas detector (25) is disposed at the outlet flue gas (14) of the desulfurization tower (12).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123087086.0U CN217698673U (en) | 2021-12-09 | 2021-12-09 | Wet desulphurization tower device for optimally controlling water balance and gypsum dehydration |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123087086.0U CN217698673U (en) | 2021-12-09 | 2021-12-09 | Wet desulphurization tower device for optimally controlling water balance and gypsum dehydration |
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| CN217698673U true CN217698673U (en) | 2022-11-01 |
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