CN112691523A - System and method for recycling power plant water quality to purify calcium-containing sludge - Google Patents
System and method for recycling power plant water quality to purify calcium-containing sludge Download PDFInfo
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- CN112691523A CN112691523A CN202110024860.9A CN202110024860A CN112691523A CN 112691523 A CN112691523 A CN 112691523A CN 202110024860 A CN202110024860 A CN 202110024860A CN 112691523 A CN112691523 A CN 112691523A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
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Abstract
The invention provides a system and a method for purifying calcium-containing sludge by recycling water quality of a power plant. The system for purifying the calcium-containing sludge by recycling the water quality of the power plant comprises a sludge concentration tank, a desulfurizer grinding unit and a desulfurizer slurry supply unit; the sludge concentration tank is used for storing calcium-containing sludge from the power plant clarification tank, and the calcium-containing sludge is sent to the desulfurizer grinding unit or the desulfurizer slurry supply unit; the desulfurizer grinding unit is used for circularly grinding the mixed material of limestone and calcium-containing sludge; the desulfurizer slurry supply unit is used for storing calcium-containing sludge or mixed slurry from the sludge concentration tank and the desulfurizer grinding unit and sending the calcium-containing sludge or the mixed slurry to the desulfurization system to be used as a desulfurizer. Compared with the prior art, the method has the advantages that the calcium-containing sludge is conveyed to the desulfurization system to be used as the desulfurizer, so that the treatment and recycling of the calcium-containing sludge are realized, the transportation and treatment costs of polyacrylamide chemicals and sludge during the dehydration of the calcium-containing sludge are reduced, and the consumption cost of alkaline limestone serving as the desulfurizer in the desulfurization system is reduced.
Description
Technical Field
The invention relates to the technical field of solid waste recycling, in particular to a system and a method for recycling power plant water quality and purifying calcium-containing sludge.
Background
With the development of national economy, energy conservation and environmental protection increasingly become important factors influencing the survival and development of enterprises. The sludge of the water quality purification system of the coal-fired power plant is taken as an important solid waste, the sludge is mainly dewatered and aired at present to form a dry sludge cake and then is transported to the outside of the plant, but the problems of poor operation environment of the sludge treatment system, high operation and maintenance difficulty of a sludge dewatering machine, high medicament consumption, limited sludge transportation, high treatment cost and the like existing in the mode are highlighted day by day, and meanwhile, the environmental protection risk in the operation process of the power plant is increased to a certain extent, so that how to reasonably utilize the sludge of the water quality purification system becomes an urgent task.
Because the sludge of the water quality purification system contains a large amount of limestone CaCO3Its relative content is up to 76.569%. The limestone wet desulfurization method is a common process for flue gas desulfurization in a power plant, and the desulfurizer and sludge have the same components, so that the sludge of a water purification system in the coal-fired power plant is conveyed to a desulfurization system to be used as the desulfurizer, the sludge treatment cost and the desulfurizer cost are reduced, zero emission of solid waste is realized, and effective reference can be provided for sludge treatment of the power plant to a certain extent.
Disclosure of Invention
In view of the above-mentioned deficiencies in the prior art, the present invention provides a system for recycling water from a power plant to purify calcium-containing sludge, which can effectively reduce sludge disposal costs.
The invention provides a system for purifying calcium-containing sludge by recycling water quality of a power plant, which comprises a sludge concentration tank, a desulfurizer grinding unit and a desulfurizer slurry supply unit;
the sludge concentration tank is used for storing calcium-containing sludge from a power plant clarification tank, and an outlet of the sludge concentration tank is respectively connected with the desulfurizer grinding unit and the desulfurizer slurry supply unit through pipelines;
the desulfurizer grinding unit comprises a mill recirculation box, a cyclone separation mechanism and a limestone wet ball mill; wherein, the inlet of the mill recirculation box is respectively connected with the outlet of the sludge concentration tank and the outlet of the limestone wet ball mill through pipelines, and the outlet of the mill recirculation box is connected with the inlet of the cyclone separation mechanism through a pipeline; the cyclone separation mechanism comprises a cyclone separator, an outlet at the top of the cyclone separator is connected with an inlet of the desulfurizing agent slurry supply unit through a pipeline, and an outlet at the bottom of the cyclone separator is connected with an inlet of the limestone wet ball mill through a pipeline;
the desulfurizer slurry supply unit is used for storing calcium-containing sludge from the sludge concentration tank and the desulfurizer grinding unit, and an outlet of the desulfurizer slurry supply unit is connected with a desulfurization system through a pipeline.
Preferably, the cyclone separation mechanism further comprises a cyclone feeding box, an inlet of the cyclone feeding box is connected with an outlet of the mill recirculation box through a pipeline, and an outlet of the cyclone feeding box is connected with an inlet of the cyclone separator through a pipeline.
Preferably, the cyclone separator is provided with a plurality of cyclones which are connected in parallel.
Preferably, the desulfurizer grinding unit further comprises an underflow collecting box and an overflow collecting box, wherein an inlet of the underflow collecting box is connected with a bottom outlet of the cyclone separator through a pipeline, and an outlet of the underflow collecting box is connected with an inlet of the limestone wet ball mill through a pipeline; the inlet of the overflow collecting box is connected with the top outlet of the cyclone separator through a pipeline, and the outlet of the overflow collecting box is respectively connected with the inlet of the mill recirculation box and the inlet of the desulfurizer slurry supply unit through pipelines.
Preferably, the desulfurizer grinding unit further comprises a limestone feeding device for supplying limestone to the limestone wet ball mill, and a discharge port of the limestone feeding device is connected with an inlet of the limestone wet ball mill through a pipeline.
Preferably, a flushing part is arranged at the outlet of the sludge concentration tank and used for flushing an outlet pipeline of the sludge concentration tank.
Preferably, the system further comprises a centrifugal dehydrator, wherein an inlet of the centrifugal dehydrator is connected with an outlet of the sludge concentration tank through a pipeline.
The invention also provides a method for purifying the calcium-containing sludge by recycling the water quality of the power plant, which adopts the system to determine the density of the calcium-containing sludge in the sludge concentration tank, and if the density of the calcium-containing sludge is greater than the preset density, the calcium-containing sludge is conveyed to a desulfurizer slurry supply unit; if the density of the calcium-containing sludge is less than or equal to the preset density, conveying the calcium-containing sludge to the mill recirculation box to be mixed with limestone slurry ground by a limestone wet ball mill;
feeding the mixed slurry of the calcium-containing sludge and the limestone in the mill recirculation box into a cyclone separator for separation; the mixed slurry of the calcium-containing sludge and the limestone flowing out of the top outlet of the cyclone separator enters a desulfurizing agent slurry supply unit, and the mixed slurry of the calcium-containing sludge and the limestone flowing out of the bottom outlet of the separator enters a limestone wet ball mill; the limestone and calcium-containing sludge mixed material ground in the limestone wet ball mill is sent into a mill recirculation box again to complete circulation;
and feeding the mixed slurry of the calcium-containing sludge and the limestone in the desulfurizing agent slurry supply unit into a desulfurizing system for desulfurization.
Preferably, the desulfurization system comprises an absorption tower, the mixed slurry of calcium-containing sludge and limestone in the desulfurizer slurry supply unit is fed into the top of the absorption tower, the mixed slurry of calcium-containing sludge and limestone is sprayed from top to bottom in the absorption tower to form alkaline slurry fog drops and is in countercurrent contact with the flue gas entering the absorption tower, and the slurry absorbs SO in the flue gas2Post-reaction to CaSO3By oxidation and crystallization to form CaSO4·2H2And O, producing gypsum after dehydration to realize desulfurization.
Preferably, when the desulfurization system cannot consume enough calcium-containing sludge, the calcium-containing sludge in the sludge concentration tank is conveyed to a centrifugal dehydrator for dehydration treatment, and the dehydrated sludge is aired and then conveyed to a boiler for blending combustion.
Compared with the prior art, the invention has the beneficial effects that:
1. the calcium-containing sludge is conveyed to the desulfurization system to be used as a desulfurizer, so that the treatment and recycling of the calcium-containing sludge are realized, on one hand, the polyacrylamide chemical medicine and sludge transportation and treatment cost during the dehydration of the calcium-containing sludge are reduced, on the other hand, the consumption cost of the desulfurizer alkaline limestone in the desulfurization system is reduced, and the method has important significance for solving the problem of environmental protection risk in the traditional sludge treatment;
2. the first sludge conveying pump and the second sludge conveying pump are arranged in the water quality purification calcium-containing sludge conveying device, so that the requirement of conveying sludge through the second sludge conveying pump when the sludge conveying pump is maintained for standby can be met, and meanwhile, the calcium-containing sludge is conveyed into the centrifugal dehydrator for dehydration, airing and blending combustion when the desulfurization system cannot consume enough calcium-containing sludge through the centrifugal dehydrator by arranging the centrifugal dehydrator connected with the second sludge conveying pump, so that zero emission of the calcium-containing sludge is realized;
3. according to the invention, the spare limestone slurry tank is arranged in the desulfurizer slurry supply unit, the destination of the calcium-containing sludge can be flexibly adjusted according to the density of the calcium-containing sludge in the sludge concentration tank, and when the density of the calcium-containing sludge is higher than the preset density, the calcium-containing sludge is directly conveyed to the spare limestone slurry tank to be sent to the absorption tower to be used as a desulfurizer, so that the grinding cost and consumption of the calcium-containing sludge in a desulfurizer grinding device are reduced, and the efficient and economic operation of the system is realized.
The features mentioned above can be combined in various suitable ways or replaced by equivalent features as long as the object of the invention is achieved.
Drawings
The invention will be described in more detail hereinafter on the basis of non-limiting examples only and with reference to the accompanying drawings. Wherein:
fig. 1 is a schematic structural diagram of a system for purifying calcium-containing sludge by recycling water from a power plant according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a conveying unit for calcium-containing sludge for water purification according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a desulfurizing agent grinding unit according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a desulfurizing agent slurry supply unit according to an embodiment of the present invention.
Description of reference numerals:
1. a sludge concentration tank; 2. a first sludge transfer pump; 3. a second sludge transfer pump; 4. a centrifugal dehydrator; 5. a mill recirculation tank; 6. a first recirculation pump; 7. b, a recirculation pump; 8. a rotational flow feeding box; 9. a first cyclonic separator; 10. a second cyclonic separator; 11. a third cyclone separator; 12. an overflow collection box; 13. the underflow collecting box; 14. a limestone feeding device; 15. limestone wet ball mill; 16. a ball feeding hopper; 17. a limestone slurry tank; 18. a limestone slurry tank is reserved; 19. a first limestone slurry pump; 20. a limestone slurry pump; 21. preparing a limestone slurry pump; 22. preparing a limestone slurry pump; 23. an absorption tower; 24. a first pneumatic ball valve; 25. a second pneumatic ball valve; 26. a third pneumatic ball valve; 27. a fourth pneumatic ball valve; 28. a first manual ball valve; 29. a second manual ball valve; 30. a third manual ball valve; 31. a fourth manual ball valve; 32. a fifth manual ball valve; 33. a sixth manual ball valve; 34. a seventh manual ball valve; 35. an eighth manual ball valve; 36. a ninth manual ball valve; 37. a tenth manual ball valve; 38. an eleventh manual ball valve; 39. a first electrically powered ball valve; 40. a second electrically operated ball valve; 41. a third electric ball valve; 42. a fourth electrically operated ball valve; 43. a fifth electric ball valve; 44. a sixth electric ball valve; 45. a seventh electric ball valve; 46. an eighth electric ball valve; 47. a first manual butterfly valve; 48. a second manual butterfly valve; 49. a third manual butterfly valve; 50. a fourth manual butterfly valve; 51. a fifth manual butterfly valve; 52. a sixth manual butterfly valve; 53. a seventh manual butterfly valve; 54. an eighth manual butterfly valve; 55. a ninth manual butterfly valve; 56. a tenth manual butterfly valve; 57. eleventh manual butterfly valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and more complete, the following technical solutions of the present invention will be described in detail, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the specific embodiments of the present invention belong to the protection scope of the present invention.
As shown in figure 1, the system for recycling the water quality of the power plant to purify the calcium-containing sludge comprises a sludge concentration tank 1, a desulfurizer grinding unit and a desulfurizer slurry supply unit. Wherein the sludge concentration tank 1 is used for storing calcium-containing sludge from a power plant clarification tank, and the desulfurizer grinding unit is used for grinding limestone added into the sludge into slurry and mixing the slurry with the calcium-containing sludge from the sludge concentration tank 1; the desulfurizer grinding unit is used for storing calcium-containing sludge from the sludge concentration tank 1 and the desulfurizer grinding unit, and an outlet of the desulfurizer slurry supply unit is connected with a desulfurization system through a pipeline.
Sludge and sewage discharged from a clarification tank of a power plant and water discharged from a medicine storage area respectively flow into a sludge concentration tank 1; the outlet of the sludge concentration tank is respectively connected with the desulfurizer grinding unit and the desulfurizer slurry supply unit through pipelines. The sludge concentration tank 1, the pipeline for entering and exiting the sludge concentration tank 1, the valve and the delivery pump form a water quality purification calcium-containing sludge delivery unit.
Specifically, as shown in fig. 2, the clarification tank sludge discharge water and the drug storage area discharge water of the power plant respectively flow into the sludge concentration tank 1 through the first pneumatic ball valve 24 and the first manual butterfly valve 47; a first manual ball valve 28 and a second pneumatic ball valve 25 are sequentially arranged on an outlet pipeline of the sludge concentration tank 1, two parallel conveying pipelines are connected to the downstream of the outlet pipeline, and a second manual ball valve 29, a first sludge conveying pump 2 and a third manual ball valve 30 are sequentially arranged on one conveying pipeline; a fourth manual ball valve 31, a second sludge delivery pump 3 and a fifth manual ball valve 32 are sequentially arranged on the other delivery pipeline; third pneumatic ball valves 26 are arranged on the connecting pipelines between the third manual ball valve 30 and the fifth manual ball valve 32 and the desulfurizer grinding unit; and fourth pneumatic ball valves 27 are arranged on the pipelines between the third manual ball valve 30 and the desulfurizer slurry supply unit, and between the fifth manual ball valve 32 and the desulfurizer slurry supply unit. In order to prevent the pipeline from being blocked, a flushing component is arranged at the outlet of the sludge concentration tank 1 and is used for flushing an outlet pipeline of the sludge concentration tank 1. Specifically, the flushing component is a second manual butterfly valve 48, an inlet of the second manual butterfly valve 48 is connected with a water supply system through a pipeline, industrial water flows into an outlet pipeline of the sludge concentration tank 1 through the second manual butterfly valve 48, and a conveying pipeline for purifying calcium-containing sludge in water quality is flushed.
The desulfurizer grinding unit comprises a mill recirculation box 5, a cyclone separation mechanism and a limestone wet ball mill 15.
As shown in fig. 1 and 3, the mill recirculation tank 5 is used for storing calcium-containing sludge from the sludge concentration tank 1, and an inlet of the mill recirculation tank 5 is connected with an outlet of the sludge concentration tank 1 and an outlet of the limestone wet ball mill 15 through pipelines respectively, and an outlet of the mill recirculation tank 5 is connected with an inlet of the cyclone separation mechanism through a pipeline; specifically, as shown in FIG. 1, the outlet of the third manual ball valve 30 and the outlet of the fifth manual ball valve 32 are connected to the inlet of the mill recirculation tank 5 through a common conduit on which the third pneumatic ball valve 26 is disposed. The outlet of the mill recirculation box 5 is connected with the inlet of the cyclone separation mechanism through two parallel pipelines, wherein one pipeline is sequentially provided with an eighth manual ball valve 35, an A recirculation pump 6 and a ninth manual ball valve 36, and the other pipeline is sequentially provided with a tenth manual ball valve 37, an B recirculation pump 7 and an eleventh manual ball valve 38.
The cyclone separating mechanism comprises a cyclone separator, a cyclone feeding box 8, an underflow collecting box 13 and an overflow collecting box 12. The inlet of the cyclone feed box 8 is connected to the outlet of the mill recirculation box 5 by a pipe and the outlet of the cyclone feed box 8 is connected to the inlet of the cyclone separator by a pipe. The cyclone separators may be provided with one or more, as shown in fig. 1, there are three cyclone separators, which are a first cyclone separator 9, a second cyclone separator 10 and a third cyclone separator 11, a third manual butterfly valve 49 is provided on a pipe connecting an inlet of the first cyclone separator 9 with an outlet of the cyclone feeding tank 8, a fourth manual butterfly valve 50 is provided on a pipe connecting an inlet of the second cyclone separator 10 with the outlet of the cyclone feeding tank 8, and a fifth manual butterfly valve 51 is provided on a pipe connecting an inlet of the third cyclone separator 11 with the outlet of the cyclone feeding tank 8. A third manual butterfly valve 49, a fourth manual butterfly valve 50 and a fifth manual butterfly valve 51 are used for regulating the flow of the mixed slurry of calcium-containing sludge and limestone entering the corresponding cyclone separators, respectively. The top outlet of each cyclone separator is connected with the inlet of the overflow collecting box 12 through a pipeline, the outlet of the overflow collecting box 12 is respectively connected with the inlet of the mill recycling box 5 and the inlet of the desulfurizer slurry supply unit through pipelines, a sixth manual butterfly valve 52 is arranged on the connecting pipeline of the overflow collecting box 12 and the desulfurizer slurry supply unit, and a seventh manual butterfly valve 53 is arranged on the connecting pipeline of the overflow collecting box 12 and the mill recycling box 5. The bottom outlet of each cyclone is connected with the inlet of the underflow collecting box 13 through a pipeline, and the outlet of the underflow collecting box 13 is connected with the inlet of the limestone wet ball mill 15 through a pipeline.
The limestone wet ball mill 15 is used for grinding limestone added into the limestone and the mixed slurry of the calcium-containing sludge and the limestone from the cyclone separator, and the mixed material of the limestone ground by the limestone wet ball mill 15 and the calcium-containing sludge is sent into the mill recycling box 5 again to complete the circulation so as to meet the requirement of the desulfurizer. In order to facilitate the addition of limestone to the limestone wet ball mill 15, a limestone feed device 14 is also provided in the system, the discharge outlet of the limestone feed device 14 being connected to the inlet of the limestone wet ball mill 15. The limestone feeding device 14 may include a limestone feeding hopper, a vibratory feeder, a bucket elevator, a limestone storage bin and a weighing feeder connected in sequence. And a ball adding hopper 16 is additionally arranged, a discharge port of the ball adding hopper 16 is connected with an inlet of the limestone wet ball mill 15, and balls are added to the limestone wet ball mill 15 through the ball adding hopper 16 so as to meet the grinding requirement.
In order to wash equipment and pipelines, the mill recirculation box 5 is connected with a water supply system through a pipeline, and an eighth manual butterfly valve 54 is arranged on the pipeline; the limestone wet ball mill 15 is connected with a water supply system through a pipeline, and a ninth manual butterfly valve 55 is arranged on the pipeline; the industrial water flows into the mill recirculation tank 5 and the limestone wet ball mill 15 through the eighth manual butterfly valve 54 and the ninth manual butterfly valve 55, respectively.
As shown in fig. 1 and 4, the desulfurizing agent slurry supply unit comprises a limestone slurry tank 17 and a spare limestone slurry tank 18. Wherein, the limestone slurry tank 17 is used for storing the mixed slurry of the calcium-containing sludge and the limestone from the overflow collecting tank 12, the inlet of the limestone slurry tank is connected with the outlet of the overflow collecting tank 12 through a pipeline, and a sixth manual butterfly valve 52 is arranged on the pipeline; the outlet of the limestone slurry tank 17 is connected to the inlet of an absorption tower 23 in the desulfurization system by two parallel pipes. One of the pipelines is sequentially provided with a first electric butterfly valve 39, a first limestone slurry pump 19 and a second electric butterfly valve 40; the other pipeline is provided with a third electric butterfly valve 41, a second limestone slurry pump 20 and a fourth electric butterfly valve 42 in sequence. The limestone slurry tank 17 is connected with a water supply system through a pipeline, and a tenth manual butterfly valve 56 is arranged on the pipeline; the industrial water flows into the limestone slurry tank 17 through the tenth manual butterfly valve 56 to adjust the density of the mixed slurry of the calcium-containing sludge and the limestone in the limestone slurry tank 17.
The reserve limestone slurry tank 18 is used for storing calcium-containing sludge from the sludge concentration tank 1, and specifically, an outlet of the third manual ball valve 30 and an outlet of the fifth manual ball valve 32 are connected to an inlet of the reserve limestone slurry tank 18 through a common pipe on which a fourth pneumatic ball valve 27 is provided. The outlet of the spare limestone slurry tank 18 is connected with the inlet of the absorption tower 23 in the desulfurization system through two parallel pipelines, wherein one pipeline is sequentially provided with a fifth electric butterfly valve 43, a first spare limestone slurry pump 21 and a sixth electric butterfly valve 44, and the other pipeline is sequentially provided with a seventh electric butterfly valve 45, a second spare limestone slurry pump 22 and an eighth electric butterfly valve 46. The spare limestone slurry tank 18 is connected with a water supply system through a pipeline, and an eleventh manual butterfly valve 57 is arranged on the pipeline; the industrial water flows into the standby limestone slurry tank 18 through the eleventh manual butterfly valve 57 to adjust the density of the calcium-containing sludge in the limestone slurry tank 18.
In one embodiment, the system for purifying calcium-containing sludge by recycling water in a power plant further comprises a centrifugal dehydrator 4, wherein an inlet of the centrifugal dehydrator 4 is connected with an outlet of the sludge concentration tank 1 through a pipeline. Specifically, as shown in fig. 1 and 2, the inlet of the centrifugal dehydrator 4 and the outlet of the second sludge transfer pump 3 are connected by a pipe, and a sixth manual ball valve 33 is provided in the pipe.
In another embodiment, the inlet of the sludge concentration tank 1 and the outlet of the second sludge transfer pump 3 are connected by a pipe, and a seventh manual ball valve 34 is provided on the pipe.
The system for recycling the water quality of the power plant to purify the calcium-containing sludge can be used for recycling the water quality of the power plant to purify the calcium-containing sludge. The method for recycling the water quality of the power plant to purify the calcium-containing sludge provided by the invention is carried out by adopting the system for recycling the water quality of the power plant to purify the calcium-containing sludge, and comprises the following steps:
measuring the density of the calcium-containing sludge in the sludge concentration tank, and if the density of the calcium-containing sludge is greater than the preset density, conveying the calcium-containing sludge to a desulfurizer slurry supply unit; if the density of the calcium-containing sludge is less than or equal to the preset density, conveying the calcium-containing sludge to a mill recirculation box;
mixing calcium-containing sludge and limestone slurry ground by a limestone wet ball mill in a mill recirculation box, and feeding the mixture into a cyclone separator for separation; mixed slurry with qualified particle size flowing out of an outlet at the top of the cyclone separator enters a desulfurizing agent slurry supply unit, and mixed slurry with unqualified particle size flowing out of an outlet at the bottom of the separator enters a limestone wet ball mill; the limestone and calcium-containing sludge mixed material ground in the limestone wet ball mill is sent into a mill recirculation box again to complete circulation;
and feeding the mixed slurry of the calcium-containing sludge and the limestone in the desulfurizing agent slurry supply unit into a desulfurizing system for desulfurization.
The method for purifying calcium-containing sludge by recycling power plant water will be described in detail with reference to the system for purifying calcium-containing sludge by recycling power plant water shown in fig. 1.
Step 1: and after naturally settling the calcium-containing sludge in the sludge concentration tank 1, measuring the density of the calcium-containing sludge in the sludge concentration tank 1, comparing the measured density with a preset density, and determining that the calcium-containing sludge is conveyed into a desulfurizer grinding unit or a desulfurizer slurry supply unit.
The calcium-containing sludge is from a clarification tank for purifying water in a power plant. The sewage of a dredge pump of the clarification tank and the sewage of a medicine storage area respectively flow into the sludge concentration tank 1 through the first pneumatic ball valve 24 and the first manual butterfly valve 47, naturally settle in the sludge concentration tank 1, then flow out through the first manual ball valve 28 and the second pneumatic ball valve 25, and then are pressurized by the first sludge delivery pump 2 or the second sludge delivery pump 3 to provide power, and then enter into a desulfurizer grinding unit or a desulfurizer slurry supply unit.
In the above steps, if the density of the calcium-containing sludge is higher than the preset density, the calcium-containing sludge can directly enter the spare limestone slurry tank 18 of the desulfurizer slurry supply unit for use, the fourth pneumatic ball valve 27 is opened, and the third pneumatic ball valve 26 is closed; if the density of the calcium-containing sludge is lower than or equal to the preset density, the calcium-containing sludge cannot directly enter the desulfurizer slurry supply unit for use, the third pneumatic ball valve 26 is opened, the fourth pneumatic ball valve 27 is closed, and the calcium-containing sludge enters the desulfurizer grinding unit. In this embodiment, the predetermined density is preferably 1080kg/m3。
In the above steps, if the first sludge transfer pump 2 is operated, the second manual ball valve 29 and the third manual ball valve 30 are opened, the calcium-containing sludge is sent to the desulfurizer grinding unit or the desulfurizer slurry supply unit through the first sludge transfer pump 2, at this time, the fourth manual ball valve 31 is closed, and the second sludge transfer pump 3 is in a standby state. If the sludge delivery pump 2 is in an overhauling or standby state, the fourth manual ball valve 31 and the fifth manual ball valve 32 are opened, the second manual ball valve 29 and the third manual ball valve 30 are closed, and the calcium-containing sludge is delivered into the desulfurizer grinding unit or the desulfurizer slurry supply unit through the second sludge delivery pump 3.
If the desulfurization system can not completely consume all the calcium-containing sludge, a part of the calcium-containing sludge is respectively conveyed into the centrifugal dehydrator 4 and the sludge concentration tank 1 through the second sludge conveying pump 3, the calcium-containing sludge entering the centrifugal dehydrator 4 is mixed with polyacrylamide through a dosing device to realize dehydration, the dehydrated sludge is aired and conveyed into a boiler to be burnt, and at the moment, the fourth manual ball valve 31, the sixth manual ball valve 33, the seventh manual ball valve 34 are opened, and the fifth manual ball valve 32 is closed.
Further, in order to prevent the pipeline from being blocked, the industrial water flows into the outlet of the sludge concentration tank 1 through the second manual butterfly valve 48 to flush the pipeline of the calcium-containing sludge conveying device for water purification.
Step 2: in the desulfurizer grinding unit, mixed slurry of calcium-containing sludge in a mill recirculation box 5 and limestone ground by a limestone wet ball mill is fed into a cyclone feeding box 8, and the mixed slurry fed into the cyclone feeding box 8 is respectively fed into a first cyclone separator 9, a second cyclone separator 10 and a third cyclone separator 11. After separation by the cyclone separator, the mixed slurry with qualified particle size overflows from the top outlet of the separator into the overflow collection box 12, one part of the mixed slurry in the overflow collection box 12 directly flows into a limestone slurry box 17 of a desulfurizer supply unit to be used as a desulfurizer, and the other part of the mixed slurry flows into the mill recirculation box 5 again to complete circulation; the unqualified mixed slurry flows out from the bottom of the separator and enters the underflow collecting box 13, the mixed slurry in the underflow collecting box 13 is sent to the inlet of a limestone wet ball mill 15 and is ground in the limestone wet ball mill 15 together with the incoming material in the limestone feeding device 14, the ball mill 15 can be used for adding balls through a ball adding hopper 16 to meet the grinding requirement, and the limestone and calcium-containing sludge mixed material ground in the limestone wet ball mill 15 is sent into a mill recycling box 5 again to complete the circulation so as to meet the requirement of a desulfurizer.
In the above steps, the mixed slurry of calcium-containing sludge from the mill recirculation tank 5 and limestone ground by the wet ball mill may be fed into the cyclone feed tank 8 through the first recirculation pump 6 or the second recirculation pump 7, and if the first recirculation pump 6 is operated, the second recirculation pump 7 is in a standby or maintenance state, at this time, the eighth manual ball valve 35 and the ninth manual ball valve 36 are opened, and the tenth manual ball valve 37 and the eleventh manual ball valve 38 are closed. If second recirculating pump 7 moves, first recirculating pump 6 is in reserve or maintenance state, and tenth manual ball valve 37, eleventh manual ball valve 38 are opened this moment, and eighth manual ball valve 35, ninth manual ball valve 36 are closed.
The mixed slurry entering the cyclone feed tank 8 can enter the first cyclone separator 9, the second cyclone separator 10 and the third cyclone separator 11 through a third manual butterfly valve 49, a fourth manual butterfly valve 50 and a fifth manual butterfly valve 51 respectively.
Part of the mixed slurry in the overflow collecting box 12 directly flows into a limestone slurry box 17 of the desulfurizer slurry supply device through a sixth manual butterfly valve 52; the other portion then re-flows into the mill recirculation tank 5 through a seventh manual butterfly valve 53.
Further, in order to flush the equipment and the piping, the industrial water flows into the mill recirculation tank 5 and the limestone wet ball mill 15 through the eighth manual butterfly valve 54 and the ninth manual butterfly valve 55, respectively.
And step 3: feeding the mixed slurry of calcium-containing sludge and limestone in the desulfurizing agent slurry supply unit into the top of an absorption tower 23 of a desulfurizing system, spraying the mixed slurry of calcium-containing sludge and limestone from top to bottom in the absorption tower 23 to form alkaline slurry fog drops, and enabling the alkaline slurry fog drops to be in countercurrent contact with flue gas entering the absorption tower 23, wherein SO in the flue gas is absorbed by the slurry2Post-reaction to CaSO3By oxidation and crystallization to form CaSO4·2H2And O, producing gypsum after dehydration to realize desulfurization.
In the desulfurizer slurry supply unit, a backup limestone slurry tank 18 is used to store calcium-containing sludge from the sludge thickener 1, and a limestone slurry tank 17 is used to store a mixed slurry of calcium-containing sludge and limestone from the overflow collection tank 12. The mixed slurry in the limestone slurry tank 17 is sent to an absorption tower 23 through a first limestone slurry pump 19 or a second limestone slurry pump 20; if the first limestone slurry pump 19 operates and the second limestone slurry pump 20 is in a standby or maintenance state, the first electric ball valve 39 and the second electric ball valve 40 are opened, and the third electric ball valve 41 and the fourth electric ball valve 42 are closed; if the second limestone slurry pump 20 is running, the first limestone slurry pump 19 is in a standby or maintenance state, and the third electric ball valve 41 and the fourth electric ball valve 42 are opened at the moment; the first and second electric ball valves 39 and 40 are closed. Calcium-containing sludge in the standby limestone slurry tank 18 is sent into an absorption tower 23 through a standby limestone slurry pump A21 or a standby limestone slurry pump B22; if the first spare limestone slurry pump 21 is operated, the second spare limestone slurry pump 22 is in a spare or overhaul state, at the moment, the fifth electric ball valve 43 and the sixth electric ball valve 44 are opened, and the seventh electric ball valve 45 and the eighth electric ball valve 46 are closed; if the backup limestone slurry pump 22 is operated, the backup limestone slurry pump 21 is in a backup or maintenance state, the seventh electric ball valve 45 and the eighth electric ball valve 46 are opened, and the fifth electric ball valve 43 and the sixth electric ball valve 44 are closed.
Finally, it should be noted that: the above embodiments and examples are only used to illustrate the technical solution of the present invention, but not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments and examples, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments or examples may still be modified, or some of the technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments or examples of the present invention.
Claims (10)
1. A system for recycling water quality of a power plant to purify calcium-containing sludge is characterized by comprising a sludge concentration tank, a desulfurizer grinding unit and a desulfurizer slurry supply unit;
the sludge concentration tank is used for storing calcium-containing sludge from a power plant clarification tank, and an outlet of the sludge concentration tank is respectively connected with the desulfurizer grinding unit and the desulfurizer slurry supply unit through pipelines;
the desulfurizer grinding unit comprises a mill recirculation box, a cyclone separation mechanism and a limestone wet ball mill; wherein, the inlet of the mill recirculation box is respectively connected with the outlet of the sludge concentration tank and the outlet of the limestone wet ball mill through pipelines, and the outlet of the mill recirculation box is connected with the inlet of the cyclone separation mechanism through a pipeline; the cyclone separation mechanism comprises a cyclone separator, an outlet at the top of the cyclone separator is connected with an inlet of the desulfurizing agent slurry supply unit through a pipeline, and an outlet at the bottom of the cyclone separator is connected with an inlet of the limestone wet ball mill through a pipeline;
the desulfurizer slurry supply unit is used for storing calcium-containing sludge from the sludge concentration tank and the desulfurizer grinding unit, and an outlet of the desulfurizer slurry supply unit is connected with a desulfurization system through a pipeline.
2. The system for recycling power plant water quality and purifying calcium-containing sludge according to claim 1, wherein the cyclone separation mechanism further comprises a cyclone feeding box, an inlet of the cyclone feeding box is connected with an outlet of the mill recirculation box through a pipeline, and an outlet of the cyclone feeding box is connected with an inlet of the cyclone separator through a pipeline.
3. The system for recycling power plant water quality to purify calcium-containing sludge according to claim 1, wherein a plurality of cyclone separators are arranged and connected in parallel.
4. The system for recycling power plant water quality and purifying calcium-containing sludge according to claim 1, wherein the desulfurizer grinding unit further comprises an underflow collecting box and an overflow collecting box, an inlet of the underflow collecting box is connected with a bottom outlet of the cyclone separator through a pipeline, and an outlet of the underflow collecting box is connected with an inlet of the limestone wet ball mill through a pipeline; the inlet of the overflow collecting box is connected with the top outlet of the cyclone separator through a pipeline, and the outlet of the overflow collecting box is respectively connected with the inlet of the mill recirculation box and the inlet of the desulfurizer slurry supply unit through pipelines.
5. The system for recycling calcium-containing sludge in power plant water quality purification according to claim 1, wherein the desulfurizer milling unit further comprises a limestone feeding device for supplying limestone to the limestone wet ball mill, and a discharge port of the limestone feeding device is connected with an inlet of the limestone wet ball mill through a pipe.
6. The system for recycling power plant water quality to purify calcium-containing sludge according to any one of claims 1 to 5, wherein a flushing component is arranged at an outlet of the sludge concentration tank, and the flushing component is used for flushing an outlet pipeline of the sludge concentration tank.
7. The system for recycling power plant water quality for purifying calcium-containing sludge according to any one of claims 1 to 5, wherein the system further comprises a centrifugal dehydrator, an inlet of the centrifugal dehydrator is connected with an outlet of the sludge concentration tank through a pipeline.
8. A method for recycling water quality of a power plant to purify calcium-containing sludge is characterized in that the system of any one of claims 1 to 7 is adopted to determine the density of the calcium-containing sludge in a sludge concentration tank, and if the density of the calcium-containing sludge is greater than the preset density, the calcium-containing sludge is conveyed to a desulfurizer slurry supply unit; if the density of the calcium-containing sludge is less than or equal to the preset density, conveying the calcium-containing sludge to the mill recirculation box to be mixed with limestone slurry ground by a limestone wet ball mill;
feeding the mixed slurry of the calcium-containing sludge and the limestone in the mill recirculation box into a cyclone separator for separation; the mixed slurry of the calcium-containing sludge and the limestone flowing out of the top outlet of the cyclone separator enters a desulfurizing agent slurry supply unit, and the mixed slurry of the calcium-containing sludge and the limestone flowing out of the bottom outlet of the separator enters a limestone wet ball mill; the limestone and calcium-containing sludge mixed material ground in the limestone wet ball mill is sent into a mill recirculation box again to complete circulation;
and feeding the mixed slurry of the calcium-containing sludge and the limestone in the desulfurizing agent slurry supply unit into a desulfurizing system for desulfurization.
9. The method for recycling power plant water quality to purify calcium-containing sludge according to claim 8, wherein the desulfurization system comprises an absorption tower, the mixed slurry of calcium-containing sludge and limestone in a desulfurizer slurry supply unit is fed into the top of the absorption tower, the mixed slurry of calcium-containing sludge and limestone is sprayed from top to bottom in the absorption tower to form alkaline slurry fog drops and is in countercurrent contact with flue gas entering the absorption tower, and the slurry absorbs SO in the flue gas2Post-reaction to CaSO3By oxidation and crystallization to form CaSO4·2H2And O, producing gypsum after dehydration to realize desulfurization.
10. The method for recycling the calcium-containing sludge in the power plant water quality purification according to claim 8, wherein when the desulfurization system cannot consume enough calcium-containing sludge, the calcium-containing sludge in the sludge concentration tank is conveyed to a centrifugal dehydrator for dehydration treatment, and the dehydrated sludge is aired and then conveyed to a boiler for blending combustion.
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| CN202110024860.9A CN112691523A (en) | 2021-01-08 | 2021-01-08 | System and method for recycling power plant water quality to purify calcium-containing sludge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113398749A (en) * | 2021-05-14 | 2021-09-17 | 国能宿州热电有限公司 | Feeding process of calcium-containing sludge recycling system of water purification system of coal-fired power plant |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113398749A (en) * | 2021-05-14 | 2021-09-17 | 国能宿州热电有限公司 | Feeding process of calcium-containing sludge recycling system of water purification system of coal-fired power plant |
| CN113398749B (en) * | 2021-05-14 | 2024-05-31 | 国能宿州热电有限公司 | Throwing process of calcium-containing sludge recycling system of water quality purification system of coal-fired power plant |
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