CN108178362B - Limestone-gypsum desulfurization wastewater zero-emission treatment method and system - Google Patents
Limestone-gypsum desulfurization wastewater zero-emission treatment method and system Download PDFInfo
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- CN108178362B CN108178362B CN201611124452.6A CN201611124452A CN108178362B CN 108178362 B CN108178362 B CN 108178362B CN 201611124452 A CN201611124452 A CN 201611124452A CN 108178362 B CN108178362 B CN 108178362B
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- 239000010440 gypsum Substances 0.000 title claims abstract description 68
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 68
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 51
- 230000023556 desulfurization Effects 0.000 title claims abstract description 51
- 239000002351 wastewater Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000002002 slurry Substances 0.000 claims abstract description 118
- 239000000706 filtrate Substances 0.000 claims abstract description 50
- 239000010881 fly ash Substances 0.000 claims abstract description 29
- 238000010521 absorption reaction Methods 0.000 claims abstract description 25
- 239000002245 particle Substances 0.000 claims abstract description 18
- 150000003839 salts Chemical class 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims abstract description 7
- 238000000967 suction filtration Methods 0.000 claims abstract description 7
- 238000003828 vacuum filtration Methods 0.000 claims abstract description 6
- 208000028659 discharge Diseases 0.000 claims abstract 3
- 238000001514 detection method Methods 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000013078 crystal Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 230000009191 jumping Effects 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 5
- 238000002425 crystallisation Methods 0.000 abstract description 2
- 230000008025 crystallization Effects 0.000 abstract description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- 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
-
- 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
- B01D53/96—Regeneration, reactivation or recycling of reactants
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
Abstract
The invention relates to a limestone-gypsum desulfurization wastewater zero-emission treatment method and a limestone-gypsum desulfurization wastewater zero-emission treatment system, wherein the method comprises the following steps: 1) Adding the modified fly ash into a filtrate tank, and conveying slurry in the filtrate tank to an absorption tower; 2) Delivering the slurry output after desulfurization in the absorption tower to a hydrocyclone station, enabling the slurry with larger particle size to flow to an underflow outlet, then downwards flowing to a vacuum belt conveyor, enabling the slurry with smaller particle size to flow to an overflow outlet, and then downwards flowing to the vacuum belt conveyor; 3) Carrying out vacuum suction filtration on the slurry by a vacuum belt conveyor, and carrying out transportation together with gypsum after the modified fly ash and salt crystallization stay on the gypsum, wherein the slurry after the vacuum suction filtration flows out; 4) The slurry after vacuum filtration flows into a filtrate tank through filtration. Compared with the prior art, the invention can be very convenient for the zero discharge treatment of the desulfurization waste water, has simple process, can realize the zero discharge of the desulfurization waste water in the true sense, and has popularization value.
Description
Technical Field
The invention relates to the technical field of flue gas purification, in particular to a limestone-gypsum desulfurization wastewater zero-emission treatment method and system.
Background
The coal-fired power generation is one of the most important ways of coal utilization in China. According to the national conditions of China, the generation of Ji Ranmei in twenty-first-generation will still take the dominant role. SO among numerous atmospheric pollutants discharged from a coal-fired thermal power unit 2 And dust is a major environmental hazard, and is the primary contaminant to be controlled. With the progress of society and the development of economy, pollution of thermal power plants to the atmospheric environment has been generally focused, so that effective reduction of pollutant emission to improve the influence on the environment is a serious challenge faced by sustainable development in the energy field of China.
In China today, flue gas desulfurization techniques that have been employed include wet desulfurization, semi-dry desulfurization, and the like. Wherein, the limestone-gypsum desulfurization technology is most widely applied due to high desulfurization efficiency, mature technology and simple and easily available raw materials. The limestone-gypsum flue gas desulfurization is also a process flow adopted by large-scale thermal power plants around 80% at home and abroad. During operation of wet flue gas desulfurization systems, ions in the absorber slurry are continuously accumulated, such as Cl - 、F - Heavy metal ions such as mercury, lead, nickel, arsenic and chromium, and the like, after the ions reach a certain concentration, the corrosion of desulfurization equipment can be accelerated, serious harm is brought to the stability of a desulfurization system, moreover, the direct discharge of desulfurization wastewater has great harm to the ecological environment, the common chemical precipitation treatment method is complex, and chemical medicines are required to be continuously added, so that the operation cost is high. In addition, the concentration of chloride ions in the wastewater treated by the chemical treatment method of the desulfurization wastewater is almost unchanged.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the limestone-gypsum desulfurization wastewater zero-emission treatment method and system, which can be used for conveniently carrying out zero-emission treatment on desulfurization wastewater, are simple in process, can realize real zero emission of desulfurization wastewater, and have popularization value.
The aim of the invention can be achieved by the following technical scheme:
the limestone-gypsum desulfurization wastewater zero-emission treatment method comprises the following steps:
1) Adding the modified fly ash into a filtrate box, conveying slurry in the filtrate box to an absorption tower, and fully mixing and stirring with gypsum slurry in the absorption tower;
2) Delivering the slurry output after desulfurization in the absorption tower to a hydrocyclone station, and separating by the hydrocyclone station, wherein on one hand, the slurry with larger particle size flows to an underflow outlet and then flows down to a vacuum belt conveyor, and on the other hand, the slurry with smaller particle size flows to an overflow outlet and then flows down to the vacuum belt conveyor;
3) Carrying out vacuum suction filtration on the slurry by a vacuum belt conveyor, wherein on one hand, after the modified fly ash and salt crystals stay on gypsum, the modified fly ash and the salt crystals are transported out together with the gypsum, and on the other hand, the slurry after vacuum suction filtration flows out;
4) And (3) filtering the slurry after vacuum filtration, and transferring the filtered slurry into a filtrate tank, and skipping the step (1).
In the step 3), the rotating speed of the vacuum belt conveyor is adjusted through frequency conversion, so that the thickness of gypsum is kept at 10-20mm.
In the step 2), the slurry output after desulfurization in the absorption tower is pumped to a hydrocyclone station through the first slurry, and the rotating speed of the first slurry pump is adjusted through frequency conversion, so that the working pressure of the hydrocyclone station is between 0.12 and 0.15MPa.
The particle size of the modified fly ash is 5-20 microns.
The limestone gypsum desulfurization wastewater zero release treatment system for realizing the method comprises a hydrocyclone station, a vacuum belt conveyor, a first slurry pump, a filtrate tank, a vacuum pump, an underflow distributor and an overflow distributor, wherein a modified fly ash feed inlet is arranged on the filtrate tank, a slurry outlet of the filtrate tank is connected with a slurry inlet of an absorption tower, a slurry inlet of the filtrate tank is connected with a slurry outlet of the filtrate tank, a slurry inlet of the filtrate tank is connected with a slurry outlet of the vacuum belt conveyor, the vacuum pump is connected with the filtrate tank, a slurry inlet of the hydrocyclone station is connected with a slurry outlet of an absorption tower through the first slurry pump, an underflow outlet at the bottom of the hydrocyclone station is connected with a slurry inlet of the underflow distributor, and slurry outlets of the hydrocyclone station and the overflow distributor are both positioned above the vacuum belt conveyor.
The slurry outlets of the underflow distributor and the slurry outlets of the overflow distributor are sequentially arranged along the transmission direction of the vacuum belt conveyor.
The horizontal distance between the slurry outlet of the underflow distributor and the slurry outlet of the overflow distributor is 0.6-1.2 m.
The system further comprises a central controller, a gypsum thickness detection sensor and a first frequency converter, wherein the gypsum thickness detection sensor and the first frequency converter are respectively connected with the central controller, the gypsum thickness detection sensor is arranged on the vacuum belt conveyor, and the first frequency converter is connected with the belt drive of the vacuum belt conveyor.
The system also comprises a pressure detection sensor and a second frequency converter, wherein the central controller is connected with the first slurry pump through the second frequency converter, and the pressure detection sensor is arranged in the hydrocyclone station.
The filtrate tank is internally provided with a stirrer, and the stirrer is arranged in the filtrate tank through a height-adjustable component.
The invention utilizes the modified fly ash to react with chloride ions under the activation of gypsum in desulfurization wastewater to generate 'Fisher salt', and the modified fly ash reacts with Cl - The method has the advantages that the method has strong physical and chemical adsorption capacity on heavy metals and the like, salt crystals are formed by combining vacuum suction and crystallization of a vacuum belt conveyor, various impurities in filtrate are removed by utilizing the filtering action of a gypsum layer, gypsum is sent out, and the filtrate is recycled to an absorption tower or a limestone pulping system, so that the aim of zero emission is fulfilled.
Compared with the prior art, the invention has the following advantages:
1. according to the system disclosed by the invention, modified fly ash with the particle size of 5-20 microns is added into the slurry in the absorption tower, the slurry is mixed and stirred in the absorption tower, then the slurry is pumped to the hydrocyclone station, the underflow flows to the vacuum belt conveyor, the overflow part of the hydrocyclone station flows to the same vacuum belt conveyor, and is subjected to suction filtration, solid granular substances are filtered by filter cloth, the filtrate is collected to the filtrate tank and recycled to the absorption tower, the filtrate quality meets the requirement of limestone-gypsum desulfurization water, zero emission of desulfurization wastewater is realized, zero emission treatment of the desulfurization wastewater can be very convenient, the process is simple, and the manpower is saved.
2. The bottom flow uniformly-distributing device and the overflow uniformly-distributing device realize uniform spraying of the slurry, the slurry outlets of the bottom flow uniformly-distributing device and the slurry outlets of the overflow uniformly-distributing device are arranged above the vacuum belt conveyor front and back, and an optimal interval is kept, so that the modified fly ash is fully contacted with the gypsum, and various impurities in the filtrate are better removed.
3. The central controller is arranged, the rotating speed of the belt conveyor is adjusted through the gypsum thickness detection sensor and the first frequency converter in a frequency conversion manner, the thickness of gypsum is effectively controlled to be 10-20mm, the problem that the contact time of modified fly ash and gypsum in desulfurization wastewater is insufficient and the filtering effect is poor due to the fact that the rotating speed of the vacuum belt conveyor is too high is avoided, and the problem that the recycling efficiency of wastewater is influenced due to the fact that the rotating speed of the vacuum belt conveyor is too low is avoided.
4. The central controller also adjusts the rotating speed of the first slurry pump through the pressure detection sensor and the second frequency converter in a frequency conversion manner, effectively controls the working pressure of the hydraulic cyclone station to be 0.12-0.15MPa, is beneficial to separating gypsum slurry with larger particle size and gypsum slurry with smaller particle size from the underflow outlet and the overflow outlet of the hydraulic cyclone station, and provides guarantee for the full contact between the modified fly ash and gypsum.
5. The existing limestone-gypsum desulfurization device is fully utilized, and the zero emission treatment of desulfurization wastewater can be realized with only a little change.
6. The system has compact structure and simple method implementation, can realize zero emission of desulfurization wastewater in a real sense, is environment-friendly and safe, and has popularization value.
Drawings
FIG. 1 is a schematic diagram of a system architecture of the present invention;
FIG. 2 is a flow chart of the method of the present invention.
In the figure: 1. the device comprises a hydrocyclone station, 2, a vacuum belt conveyor, 3, a first slurry pump, 4, a filtrate tank, 5, a filtrate tank, 6, a vacuum pump, 7, an underflow distributor, 8, an overflow distributor, 9, a modified fly ash charging port, 10, a central controller, 11, a gypsum thickness detection sensor, 12, a first frequency converter, 13, a pressure detection sensor, 14, a second frequency converter, 15, a stirrer, 16, a height adjustable component, 17, a second slurry pump, 18, a manual valve, 19 and an absorption tower.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
As shown in fig. 1, the limestone-gypsum desulfurization wastewater zero-emission treatment system comprises a hydrocyclone station 1, a vacuum belt conveyor 2, a first slurry pump 3, a filtrate tank 4, a filtrate tank 5, a vacuum pump 6, an underflow distributor 7 and an overflow distributor 8, wherein a modified fly ash feed inlet 9 is arranged on the filtrate tank 4, the modified fly ash feed inlet 9 adopts a feed inlet for adding modified fly ash with the particle size of 5-20 microns, a dust hood for preventing dust is further arranged above the feed inlet, a slurry outlet of the filtrate tank 4 is connected with a slurry inlet of an absorption tower 19 through a second slurry pump 17, a slurry inlet of the filtrate tank 4 is connected with a slurry outlet of the filtrate tank 5, a slurry inlet of the filtrate tank 5 is connected with a slurry outlet of the vacuum belt conveyor 2, the vacuum pump 6 is connected with the filtrate tank 5, a slurry inlet of the hydrocyclone station 1 is connected with a slurry outlet of an absorption tower 19 through the first slurry pump 3, a slurry outlet of the bottom of the hydrocyclone station 1 is connected with a slurry inlet of the underflow distributor 7, an overflow outlet of the top of the hydrocyclone station 1 is connected with a slurry inlet of the overflow distributor 8, and a slurry outlet of the underflow distributor 7 and a slurry outlet of the overflow distributor 8 is positioned above the vacuum belt conveyor 2.
The slurry outlets of the underflow distributor 7 and the slurry outlets of the overflow distributor 8 are sequentially arranged along the transmission direction of the vacuum belt conveyor 2. The horizontal distance between the slurry outlet of the underflow distributor 7 and the slurry outlet of the overflow distributor 8 is 0.6-1.2 m.
Optionally, the system further comprises a central controller 10, and a gypsum thickness detection sensor 11 and a first frequency converter 12 which are respectively connected with the central controller 10, wherein the gypsum thickness detection sensor 11 is arranged on the vacuum belt conveyor 2, and the first frequency converter 12 is connected with a belt driver of the vacuum belt conveyor 2. The central controller 10 can adopt a PLC controller, and the gypsum thickness detection sensor 11 can adopt an upper laser displacement sensor and a lower laser displacement sensor which are opposite.
Optionally, the system further comprises a pressure detection sensor 13 and a second frequency converter 14, wherein the central controller 10 is connected with the first slurry pump 3 through the second frequency converter 14, and the pressure detection sensor 13 is arranged in the hydrocyclone plant.
Be equipped with agitator 15 in the filtrate case 4, agitator 15 locates in the filtrate case 4 through high adjustable subassembly 16, and high adjustable subassembly 16 can adopt ball screw structure, and the puddler of agitator 15 sets up on ball screw structure's nut, and ball screw structure's screw rod is connected the motor to realize the altitude mixture control of agitator 15's puddler, with the stirring demand of adaptation filtrate incasement 4 different liquid level.
A manual valve 18 is arranged in front of the slurry inlet of the hydrocyclone plant 1 and is used in equipment maintenance.
As shown in fig. 2, the method for realizing zero emission treatment of limestone-gypsum desulfurization wastewater by using the system comprises the following steps:
1) Adding modified fly ash with the particle size of 5-20 microns into a filtrate tank 4, conveying slurry in the filtrate tank 4 to an absorption tower 19, fully mixing and stirring with gypsum slurry in the absorption tower 19 (in the embodiment, the particle size of the modified fly ash is 15 microns);
2) The slurry output after desulfurization in the absorption tower 19 is sent to the hydrocyclone station 1 and separated by the hydrocyclone station 1, on one hand, the slurry with larger particle size flows to the underflow outlet and then flows down to the vacuum belt conveyor 2, and on the other hand, the slurry with smaller particle size flows to the overflow outlet and then flows down to the vacuum belt conveyor 2;
3) On one hand, the density of the modified fly ash with the grain diameter of 5-20 microns is lighter than that of gypsum, the fly ash floats on the surface of the gypsum slurry, and on the other hand, the slurry on the vacuum belt 2 is subjected to vacuum filtration, so that the fly ash and salt crystals stay on the surface of the gypsum, impurities in the wastewater and the gypsum enter a gypsum bin to be removed, in the figure 1, A is the gypsum transported by the vacuum belt 2, and on the other hand, the slurry after vacuum filtration flows out;
4) And (3) filtering the slurry after vacuum filtration, and conveying the slurry into a filtrate box 4, and carrying out gypsum outward in a gypsum bin, and skipping the step 1) to realize the cyclic recycling of the gypsum slurry.
In the step 3), the rotating speed of the vacuum belt conveyor 2 is adjusted through frequency conversion, so that the thickness of gypsum is kept at 10-20mm (15 mm is selected in the embodiment), the problems that the contact time of modified fly ash and gypsum in desulfurization wastewater is insufficient and the filtering effect is poor due to the fact that the rotating speed of the vacuum belt conveyor 2 is too high and the waste water recovery efficiency is affected due to the fact that the rotating speed of the vacuum belt conveyor 2 is too low are avoided.
In the step 2), the slurry output after desulfurization in the absorption tower 19 is sent to the hydrocyclone station 1 through the first slurry pump 3, and the rotating speed of the first slurry pump 3 is adjusted in a variable frequency mode, so that the working pressure of the hydrocyclone station 1 is between 0.12 and 0.15MPa (in the embodiment, the working pressure is 0.13 MPa), the hydrocyclone station 1 is beneficial to separating gypsum slurry with larger particle size and gypsum slurry with smaller particle size into an underflow outlet and an overflow outlet, and a guarantee is provided for fully contacting the modified fly ash with gypsum.
Claims (10)
1. The zero discharge treatment method for the limestone-gypsum desulfurization wastewater is characterized by comprising the following steps of:
1) Adding the modified fly ash into a filtrate tank (4), conveying slurry in the filtrate tank (4) to an absorption tower (19), fully mixing with gypsum slurry in the absorption tower (19), and stirring uniformly;
2) The slurry output after desulfurization in the absorption tower (19) is sent to a hydrocyclone station (1) and separated by the hydrocyclone station (1), on one hand, the slurry with larger particle size flows to an underflow outlet and then flows down to a vacuum belt conveyor (2), and on the other hand, the slurry with smaller particle size flows to an overflow outlet and then flows down to the vacuum belt conveyor (2);
3) The slurry is subjected to vacuum suction filtration by a vacuum belt conveyor (2), on one hand, after the modified fly ash and the salt crystals stay on the gypsum, the modified fly ash and the salt crystals are transported out together with the gypsum, and on the other hand, the slurry subjected to vacuum suction filtration flows out;
4) And (3) filtering the slurry after vacuum filtration, flowing the slurry into a filtrate tank (4), and jumping to the step (1).
2. The zero emission treatment method of limestone-gypsum desulfurization waste water according to claim 1, wherein in the step 3), the rotation speed of the vacuum belt conveyor (2) is adjusted by frequency conversion, so that the thickness of gypsum is kept at 10-20mm.
3. The method for zero emission treatment of desulfurization wastewater by a limestone-gypsum method according to claim 1, wherein in the step 2), the slurry output after desulfurization in the absorption tower (19) is sent to the hydrocyclone station (1) through the first slurry pump (3), and the rotation speed of the first slurry pump (3) is adjusted by frequency conversion, so that the working pressure of the hydrocyclone station (1) is 0.12-0.15MPa.
4. The zero emission treatment method of limestone-gypsum desulfurization wastewater, according to claim 1, wherein the particle size of the modified fly ash is 5-20 microns.
5. The limestone-gypsum desulfurization wastewater zero-emission treatment system for realizing the method according to claim 1 is characterized by comprising a hydrocyclone station (1), a vacuum belt conveyor (2), a first slurry pump (3), a filtrate tank (4), a filtrate tank (5), a vacuum pump (6), an underflow distributor (7) and an overflow distributor (8), wherein a modified fly ash charging port (9) is arranged on the filtrate tank (4), a slurry outlet of the filtrate tank (4) is connected with a slurry inlet of an absorption tower (19), a slurry inlet of the filtrate tank (4) is connected with a slurry outlet of the filtrate tank (5), a slurry inlet of the filtrate tank (5) is connected with a slurry outlet of the vacuum belt conveyor (2), the vacuum pump (6) is connected with the slurry outlet of the filtrate tank (5), a slurry inlet of the hydrocyclone station (1) is connected with a slurry outlet of the absorption tower (19) through the first slurry pump (3), an outlet of the bottom of the hydrocyclone station (1) is connected with a slurry inlet of the underflow distributor (7), and an overflow outlet of the top of the hydrocyclone station (1) is connected with a slurry inlet of the overflow distributor (8), and the slurry outlet of the hydrocyclone station (1) and the slurry outlet of the overflow distributor (7) is positioned on the vacuum belt conveyor (2).
6. The limestone-gypsum desulfurization wastewater zero-emission treatment system according to claim 5, wherein the slurry outlets of the underflow distributor (7) and the slurry outlets of the overflow distributor (8) are sequentially arranged along the transmission direction of the vacuum belt conveyor (2).
7. The limestone-gypsum desulfurization wastewater zero-emission treatment system according to claim 6, wherein the horizontal distance between the slurry outlet of the underflow distributor (7) and the slurry outlet of the overflow distributor (8) is 0.6-1.2 m.
8. The limestone-gypsum desulfurization wastewater zero-emission treatment system according to claim 5, further comprising a central controller (10), and a gypsum thickness detection sensor (11) and a first frequency converter (12) which are respectively connected with the central controller (10), wherein the gypsum thickness detection sensor (11) is arranged on the vacuum belt conveyor (2), and the first frequency converter (12) is connected with a belt driver of the vacuum belt conveyor (2).
9. The limestone-gypsum desulfurization waste water zero-emission treatment system according to claim 8, further comprising a pressure detection sensor (13) and a second frequency converter (14), wherein the central controller (10) is connected with the first slurry pump (3) through the second frequency converter (14), and the pressure detection sensor (13) is arranged in the hydrocyclone station.
10. The limestone-gypsum desulfurization wastewater zero-emission treatment system according to claim 5, wherein a stirrer (15) is arranged in the filtrate tank (4), and the stirrer (15) is arranged in the filtrate tank (4) through a height-adjustable component (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611124452.6A CN108178362B (en) | 2016-12-08 | 2016-12-08 | Limestone-gypsum desulfurization wastewater zero-emission treatment method and system |
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|---|---|---|---|
| CN201611124452.6A CN108178362B (en) | 2016-12-08 | 2016-12-08 | Limestone-gypsum desulfurization wastewater zero-emission treatment method and system |
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| CN108178362A CN108178362A (en) | 2018-06-19 |
| CN108178362B true CN108178362B (en) | 2024-03-15 |
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| CN111732235B (en) * | 2020-07-21 | 2024-01-23 | 西安西热水务环保有限公司 | Self-circulation zero-emission system and method for desulfurization wastewater of coal-fired power plant |
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