CN113171675A - Desulfurization gypsum grading cleaning device and method - Google Patents
Desulfurization gypsum grading cleaning device and method Download PDFInfo
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- CN113171675A CN113171675A CN202010150515.5A CN202010150515A CN113171675A CN 113171675 A CN113171675 A CN 113171675A CN 202010150515 A CN202010150515 A CN 202010150515A CN 113171675 A CN113171675 A CN 113171675A
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- gypsum
- cleaning machine
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- gypsum slurry
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/04—Combinations of filters with settling tanks
- B01D36/045—Combination of filters with centrifugal separation devices
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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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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
- B08B3/12—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration by sonic or ultrasonic vibrations
Abstract
The invention relates to the field of desulfurized gypsum cleaning equipment, in particular to a desulfurized gypsum grading cleaning device and a washing method. The desulfurization gypsum grading and cleaning device comprises a spray head, a cleaning machine and a plurality of concentration devices, wherein the cleaning machine and the plurality of concentration devices are sequentially arranged, and gypsum slurry to be treated sequentially passes through the cleaning machine and the plurality of concentration devices; the cleaning machine and at least part of the concentration device are provided with spray heads. Be provided with the shower nozzle on the cleaning machine to and at least partial enrichment facility, can realize washing many times of gypsum thick liquid, can effectual reduction chloride ion and impurity content.
Description
Technical Field
The invention relates to the field of desulfurized gypsum cleaning equipment, in particular to a desulfurized gypsum grading cleaning device and a washing method.
Background
The coal-fired power plant mostly adopts a wet desulphurization process (about 90%) to carry out flue gas desulphurization, the limestone-gypsum method is a main technical means, and a desulphurization byproduct is desulfurized gypsum, namely calcium sulfate dihydrate (CaSO 4.2H 2O), and the desulfurized gypsum can be widely used as a raw material for preparing building material products such as gypsum boards, gypsum blocks, gypsum powder and the like. However, the production process of gypsum has no mature process and complete equipment, the process parameters are not specific, and the matched equipment is not sound, so that the quality of the desulfurized gypsum is uneven, and the desulfurized gypsum directly produced by a power plant can hardly meet the quality requirement of the building material field for raw materials, namely national standard of flue gas desulfurized gypsum. A large amount of desulfurized gypsum can only be treated as solid waste, which causes great waste of resources. The main impurities of the desulfurized gypsum comprise soluble salt (Cl < - >, F < - >), calcium carbonate, calcium sulfite, trace heavy metals and the like, wherein over-high chloride ions are the main reason for poor quality of the desulfurized gypsum, and in addition, the water content is also an important index of the desulfurized gypsum product. The desulfurization gypsum is cleaned and decontaminated to form a set of device or system, and the urgent need for solution exists.
For example, the application number is CN201711443367.0, a high-chlorine desulfurized gypsum washing method is provided, the high-chlorine gypsum is washed through a vacuum belt dehydration system, the content of chloride ions in the gypsum slurry from the source is increased from normal 20000PPm to 50000PPm, and in order to ensure the normal operation of a belt dehydrator and the quality of gypsum, filter cake washing water is recycled.
The above gypsum washing method has the following problems:
1, only one washing is carried out, and the content of chloride ions and impurities cannot be effectively reduced.
2, the filter cake dewatered by the vacuum belt conveyor is washed, and only the chloride ions on the surface of the filter cake can be washed, but the chloride ions in the filter cake cannot be washed.
3, the washing time is short, and soluble impurities cannot be fully dissolved.
4, the water consumption for flushing is large, which causes a great amount of high-salinity wastewater to increase, and increases the difficulty for subsequent high-salinity wastewater treatment.
Disclosure of Invention
The invention provides a desulfurization gypsum grading cleaning device and a washing method, which solve the problem that the content of chloride ions and impurities cannot be effectively reduced at present.
The technical scheme of the invention is realized as follows:
the desulfurization gypsum grading and cleaning device comprises a spray head, a cleaning machine and a plurality of concentration devices, wherein the cleaning machine and the plurality of concentration devices are sequentially arranged, and gypsum slurry to be treated sequentially passes through the cleaning machine and the plurality of concentration devices;
the cleaning machine and at least part of the concentration device are provided with spray heads.
Preferably, the cleaning machine is an ultrasonic cleaning machine;
the upper part of the ultrasonic cleaning machine is provided with a spray head.
Preferably, the desulfurized gypsum grading and cleaning device comprises three concentration devices;
the three concentration devices are respectively a gypsum cyclone, a disc dehydrator and a vacuum belt conveyor;
the gypsum cyclone, the disc dehydrator and the vacuum belt conveyor are sequentially arranged, and the gypsum cyclone and the disc dehydrator are respectively provided with a spray head for washing gypsum slurry inside the gypsum cyclone and the disc dehydrator.
Preferably, still include the inlet tube, the shower nozzle all with the inlet tube intercommunication, and all be provided with the governing valve that is used for adjusting the water spray volume on every shower nozzle.
Preferably, the device also comprises a recovery water bucket;
the bottom of ultrasonic cleaner, gypsum swirler and disc hydroextractor all is provided with the drain pipe, the drain pipe communicates with the recovery cask.
Preferably, the feeding end of the ultrasonic flushing machine is provided with a discharge pump, and the discharge end of the disc dehydrator is connected with the feeding end of the vacuum belt conveyor.
A desulfurization gypsum grading washing method comprises the steps of washing and concentrating gypsum slurry for multiple times;
the washing of the gypsum slurry is performed during the gypsum slurry washing process and during a portion of the concentration process.
Preferably, the flushing of the gypsum slurry is performed during the first few thickening cycles of the gypsum slurry.
Preferably, the gypsum slurry is subjected to three concentration passes, with the flushing of the gypsum slurry occurring during the first two gypsum slurry concentration passes.
Preferably, the gypsum slurry is washed by spraying.
According to the technical scheme, the cleaning machine and at least part of the concentration device are provided with the spray heads, so that multiple times of washing of gypsum slurry can be realized, and the content of chloride ions and impurities can be effectively reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a desulfurized gypsum grading and cleaning device provided by the embodiment of the invention.
1: a spray head; 2: an ultrasonic cleaning machine; 3: a gypsum cyclone; 4: a disc dehydrator; 5: a vacuum belt conveyor; 6: a water inlet pipe; 7: a recovery bucket; 8: a drain pipe; 9: and a discharge pump.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in figure 1, a desulfurization gypsum grading and cleaning device is provided, which comprises a spray head 1, a cleaning machine and a plurality of concentration devices, wherein the cleaning machine and the plurality of concentration devices are arranged in sequence, and gypsum slurry to be treated sequentially passes through the cleaning machine, the plurality of concentration devices, the cleaning machine and at least part of the concentration devices, and the spray head 1 is arranged on the cleaning machine.
In the embodiment, the cleaning machine and at least part of the concentration device are provided with the spray heads 1, so that the gypsum slurry can be washed for multiple times, and the content of chloride ions and impurities can be effectively reduced.
The cleaning machine is an ultrasonic cleaning machine 2, and the upper part of the ultrasonic cleaning machine 2 is provided with a spray head 1.
The desulfurization gypsum grading and cleaning device comprises three concentration devices, wherein the three concentration devices are a gypsum cyclone 3, a disc dehydrator 4 and a vacuum belt conveyor 5 respectively.
The gypsum cyclone 3, the disc dehydrator 4 and the vacuum belt conveyor 5 are sequentially arranged, and the gypsum cyclone 3 and the disc dehydrator 4 are respectively provided with a spray head 1 for washing gypsum slurry in the gypsum cyclone 3 and the disc dehydrator 4.
The desulfurization gypsum grading flushing device further comprises a water inlet pipe 6, the spray heads 1 are communicated with the water inlet pipe 6, and each spray head 1 is provided with a regulating valve for regulating the water spraying amount. The amount of water sprayed from each nozzle 1 can be controlled by adjusting the valve.
The desulfurization gypsum grading flushing device also comprises a recovery water bucket 7, and the recovery water bucket 7 is used for recovering the spraying wastewater.
The bottoms of the ultrasonic cleaning machine 2, the gypsum cyclone 3 and the disc dehydrator 4 are all provided with a drain pipe 8, and the drain pipe 8 is communicated with a recycling water bucket 7.
The feeding end of the ultrasonic washing machine 2 is provided with a discharge pump 9, and the discharging end of the disc dehydrator 4 is connected with the feeding end of the vacuum belt conveyor 5.
In the embodiment, the desulfurization gypsum grading washing method is also provided, the gypsum slurry is washed and concentrated for multiple times, and the washing of the gypsum slurry is carried out in the gypsum slurry washing process and part of the concentration process.
The flushing of the gypsum slurry is performed during the first few thickening steps of the gypsum slurry. Specifically, the gypsum slurry is concentrated three times, and the gypsum slurry is washed in the first two gypsum slurry concentration processes. And (4) washing the gypsum slurry in a spraying mode. And after the last concentration, spraying is carried out again, spraying water cannot enter the inside of the filter cake, namely the effect of removing chloride ions by spraying in the step is poor, and the last step is not sprayed in consideration of water conservation.
In order to provide the above-described cleaning apparatus and cleaning method, the present embodiment also provides a process of treating a gypsum slurry: limestone with small particle size and high purity obtained by a ball mill is prepared into limestone slurry, the limestone slurry is conveyed to the upper part of an absorption tower through a slurry circulating pump to form a spraying layer, an oxidation fan provides necessary air quantity, the reactions of washing, circulating, absorbing, oxidizing, crystallizing and the like are carried out on sulfur-containing flue gas, the solid in the slurry is continuously separated, and the sulfur-containing flue gas is discharged through a gypsum discharge pump. Then the gypsum slurry enters a graded washing desalting system and a graded dewatering system.
The gypsum slurry enters an ultrasonic cleaning machine box through a discharge pump 9, slurry with solid content of about 8-15% is obtained after primary washing, the slurry is subjected to secondary washing simultaneously after a primary cyclone concentration device to obtain gypsum slurry with solid content of 40-50%, then the gypsum slurry is sent to a disc dehydrator and subjected to tertiary washing simultaneously, and the gypsum slurry enters a vacuum belt conveyor to be subjected to tertiary dewatering to obtain wet gypsum with water content of less than 10%. The specific description is as follows:
1: the chlorine ion content can be effectively and greatly reduced by carrying out three-time grading washing.
2: when the gypsum slurry is subjected to primary washing, the gypsum slurry is vibrated by an ultrasonic cleaning machine, and soluble salts contained in turbid substances in the gypsum slurry can be cleaned.
3: when gypsum slurry is subjected to primary washing, ultrasonic oscillation is adopted, so that the dissolving speed of chloride ions can be increased, and the aim of quick cleaning is fulfilled.
4: when gypsum slurry is subjected to primary washing, ultrasonic vibration is adopted, soluble salt can be fully dissolved, and the purpose of quick washing is achieved.
5: when the gypsum slurry is subjected to primary washing, a small amount of water is supplemented by the spray header when the density of the gypsum slurry is too high (more than 1200kg/m3), so that the water consumption can be greatly reduced.
6: when the gypsum slurry is subjected to primary dehydration, the gypsum slurry with 40-50% of solid content is obtained after passing through a primary cyclone concentration device.
7: the secondary washing is carried out on the gypsum slurry with 40 to 50 percent of solid content, so that the content of chloride ions and other impurities in the desulfurized gypsum can be reduced again.
8: when the gypsum slurry is subjected to secondary washing and tertiary washing, the spray head is also adopted, so that the water consumption can be reduced.
9: after the gypsum slurry with 40-50% of solid matter is subjected to secondary washing, the gypsum slurry enters a disc dehydrator for secondary dehydration.
10: and carrying out three-stage flushing on the gypsum filter cake subjected to the second-stage dehydration.
11: and (4) enabling the desulfurized gypsum filter cake after the three-stage washing to enter a vacuum belt conveyor for three-time dehydration to obtain wet gypsum with the water content of less than 10%.
12: and discharging the wastewater subjected to the grading flushing to a recovery water tank.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A desulfurization gypsum grading and cleaning device is characterized by comprising a spray head, a cleaning machine and a plurality of concentration devices, wherein the cleaning machine and the plurality of concentration devices are sequentially arranged, and gypsum slurry to be treated sequentially passes through the cleaning machine and the plurality of concentration devices;
the cleaning machine and at least part of the concentration device are provided with spray heads.
2. The desulfurization gypsum grading cleaning device of claim 1, wherein the cleaning machine is an ultrasonic cleaning machine;
the upper part of the ultrasonic cleaning machine is provided with a spray head.
3. The desulfurization gypsum staged cleaning device of claim 1, wherein the desulfurization gypsum staged cleaning device comprises three concentration devices;
the three concentration devices are respectively a gypsum cyclone, a disc dehydrator and a vacuum belt conveyor;
the gypsum cyclone, the disc dehydrator and the vacuum belt conveyor are sequentially arranged, and the gypsum cyclone and the disc dehydrator are respectively provided with a spray head for washing gypsum slurry inside the gypsum cyclone and the disc dehydrator.
4. The desulfurization gypsum grading washing device of claim 3, further comprising a water inlet pipe, wherein the nozzles are all communicated with the water inlet pipe, and each nozzle is provided with an adjusting valve for adjusting the water spraying amount.
5. The desulfurized gypsum staged washing apparatus of claim 3 further comprising a recovery water tank;
the bottom of ultrasonic cleaner, gypsum swirler and disc hydroextractor all is provided with the drain pipe, the drain pipe communicates with the recovery cask.
6. The desulfurized gypsum grading washing unit of claim 2, wherein the feeding end of the ultrasonic washer is provided with a discharge pump, and the discharge end of the disc dehydrator is connected with the feeding end of the vacuum belt conveyor.
7. A desulfurization gypsum grading flushing method is characterized in that gypsum slurry is cleaned and concentrated for multiple times;
the washing of the gypsum slurry is performed during the gypsum slurry washing process and during a portion of the concentration process.
8. The method of claim 7, wherein the washing of the gypsum slurry is performed during the first several times of the concentration of the gypsum slurry.
9. The method of claim 8, wherein the gypsum slurry is concentrated three times, and the gypsum slurry is washed in the first two gypsum slurry concentration processes.
10. The method for staged flushing of desulfurized gypsum according to claim 7, wherein the gypsum slurry is flushed by spraying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010150515.5A CN113171675A (en) | 2020-03-06 | 2020-03-06 | Desulfurization gypsum grading cleaning device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010150515.5A CN113171675A (en) | 2020-03-06 | 2020-03-06 | Desulfurization gypsum grading cleaning device and method |
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| CN113171675A true CN113171675A (en) | 2021-07-27 |
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| CN202010150515.5A Pending CN113171675A (en) | 2020-03-06 | 2020-03-06 | Desulfurization gypsum grading cleaning device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113860774A (en) * | 2021-09-30 | 2021-12-31 | 北京清装新材料科技有限公司 | Process for preparing low-chlorine building gypsum from desulfurized gypsum |
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2020
- 2020-03-06 CN CN202010150515.5A patent/CN113171675A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113860774A (en) * | 2021-09-30 | 2021-12-31 | 北京清装新材料科技有限公司 | Process for preparing low-chlorine building gypsum from desulfurized gypsum |
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