CN212504488U - Coal gasification wastewater treatment system utilizing gasified fine slag - Google Patents
Coal gasification wastewater treatment system utilizing gasified fine slag Download PDFInfo
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Abstract
The utility model discloses a coal gasification wastewater treatment system utilizing gasified fine slag, which is used for carrying out concentration classification and high-frequency vibration sieve classification on coal gasification black water through a swirler, and carrying out landfill treatment on fine grain products after concentration vacuum dehydration; and dehydrating, granulating and drying the screened coarse-grained product, using the granulated and dried product for adsorbing coal gasification wastewater generated in the coal gasification synthesis gas processing process, preparing coal water slurry from the adsorbed fine slag through a ball milling process, and returning the coal water slurry to a gasification furnace for blending combustion treatment. The utility model discloses a system make full use of fine sediment coarse grain level of coal gasification characteristics big, that the hole is flourishing carries out adsorption treatment to the coal gasification waste water that produces in the same coal gasification production technology to the fine sediment of gasification after the absorption carries out innocent treatment through combustion method to the pollutant.
Description
Technical Field
The utility model belongs to the technical field of coal chemical industry discarded object resource processing, in particular to utilize coal gasification effluent disposal system of thin sediment of gasification.
Background
In recent years, the coal chemical industry is rapidly developed, and coal gasification is a leading process of the whole coal chemical industry, and then a large amount of gasification fine slag and gasification waste water are generated. The coal gasification wastewater has complex pollutant components and high COD value, contains various toxic and harmful substances, and the treatment problem of the coal gasification wastewater is one of the important problems in the development of the coal gasification industry.
The common method for treating coal gasification wastewater comprises the following steps: anaerobic and aerobic processes, membrane separation, advanced oxidation, extraction separation and the like; the existing process has the problems of high cost, complex operation and the like. The adsorption method is one of the commonly used advanced treatment technologies for coal gasification wastewater, and usually adopts activated carbon as an adsorbent, but the activated carbon has high cost, so that the application of the activated carbon in industrial wastewater is limited.
At present, a large amount of gasified slag is discharged every year, the utilization rate of the gasified slag is low, and a large amount of gasified slag is subjected to landfill and stacking treatment, so that a large amount of precious land resources are occupied, meanwhile, a large amount of inorganic matters, heavy metal ions and the like in the gasified slag are extremely difficult to degrade, so that the land cannot be cultivated, and the local geological environment is influenced by a large slag yard; the treatment cost is high by landfill or stockpiling, and the environmental problem is prominent.
In summary, a new coal gasification wastewater treatment system using gasified fine slag is needed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an utilize coal gasification waste water treatment system of fine sediment of gasification to solve one or more technical problem that above-mentioned existence. The utility model discloses can effectively improve the utilization level of the thin sediment of gasification, reduce the thin sediment of gasification and the pollution of coal gasification waste water to the environment, reach the purpose of same production process "treating waste with waste".
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model discloses an utilize coal gasification effluent disposal system of thin sediment of gasification, include:
the first grading device is used for concentrating and grading the gasified black water obtained in the coal gasification process to obtain a-74 mu m overflow product and a +74 mu m underflow product;
the second grading device is used for grading the obtained underflow product with the particle size of 74 mu m to obtain an oversize product with the particle size of 100 mu m and an undersize product with the particle size of 100-74 mu m;
the concentration device is used for concentrating the obtained overflow product with the size of minus 74 micrometers and the product with the size of 100-74 micrometers below the sieve to obtain a concentrated product with the size of minus 100 micrometers;
the dehydration device is used for dehydrating the obtained-100 mu m concentrated product to obtain a-100 mu m dehydrated product; used for dehydrating the obtained product on the sieve with the particle size of +100 mu m to obtain a dehydrated product with the particle size of +100 mu m;
the granulating device is used for granulating the obtained dehydrated product with the particle size of 100 mu m to obtain a granulated product with the particle size of 100 mu m;
the drying device is used for drying the obtained granulated product with the particle size of 100 mu m to obtain a dried particle product with the particle size of 100 mu m;
and the adsorption device is used for carrying out adsorption treatment on the coal gasification wastewater in the coal gasification process through the obtained +100 mu m dry particle product to obtain an adsorbed fine slag product and the coal gasification wastewater after the adsorption treatment.
The utility model discloses a further improvement lies in, still includes:
the ball milling device is used for crushing the obtained adsorbed fine slag product to obtain a ball milled product;
the pulping device is used for mixing the obtained ball-milled product with a water-coal-slurry additive for pulping to obtain a water-coal-slurry product; and the coal water slurry product is used for being fed into a gasification furnace for co-combustion.
The utility model has the further improvement that the ball milling device is a ball mill or a rod mill; the pulping device is a pulping stirring barrel.
The utility model discloses a further improvement lies in, still includes: and the biochemical tank is used for disinfecting the wastewater clear liquid after adsorption treatment.
The utility model is further improved in that the first grading device is a grading swirler; the second grading device is a high-frequency vibrating screen or a curved screen; the concentration device is a thickener; the dehydration device is a vacuum belt conveyor or a filter press; the granulating device is a granulator; the drying device is a dryer; the adsorption device is an adsorption tank.
The utility model discloses a further improvement lies in, still includes: the gasification furnace is used for inputting coal to obtain gasified black water and synthesis gas; wherein, the coal gasification wastewater is produced in the process of processing the synthesis gas.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses a system make full use of fine sediment coarse grain level of coal gasification specific surface area is big, the well-developed characteristics in hole, carry out adsorption treatment to the coal gasification waste water that produces in the same coal gasification production technology to the fine sediment of gasification after the absorption carries out innocent treatment to the pollutant through the combustion mode, simple process, treatment effect are good, can effectively improve the utilization level of the resource of the fine sediment of gasification, and reduce the fine sediment of gasification and the pollution of coal gasification waste water to the environment, reach the purpose of same production process "treat waste with waste". The gasification fine slag has the characteristics of large specific surface area and developed pore structure, and can be used as a new adsorbent to adsorb organic matters and partial heavy metal ions in gasification wastewater.
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 are briefly introduced below; it is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic block diagram of the flow of an operating method of a coal gasification wastewater treatment system using gasified fine slag according to an embodiment of the present invention.
Detailed Description
In order to make the purpose, technical effect and technical solution of the embodiments of the present invention clearer, the following description, with reference to the drawings in the embodiments of the present invention, clearly and completely describes the technical solution in the embodiments of the present invention; obviously, the described embodiments are some of the embodiments of the present invention. Based on the embodiments disclosed in the present invention, other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.
The utility model discloses a coal gasification effluent disposal system of fine sediment of utilization gasification, include:
the first grading device is used for concentrating and grading the gasified black water obtained in the coal gasification process to obtain a-74 mu m overflow product and a +74 mu m underflow product;
the second grading device is used for grading the obtained underflow product with the particle size of 74 mu m to obtain an oversize product with the particle size of 100 mu m and an undersize product with the particle size of 100-74 mu m;
the concentration device is used for concentrating the obtained overflow product with the size of minus 74 micrometers and the product with the size of 100-74 micrometers below the sieve to obtain a concentrated product with the size of minus 100 micrometers;
the dehydration device is used for dehydrating the obtained-100 mu m concentrated product to obtain a-100 mu m dehydrated product; used for dehydrating the obtained product on the sieve with the particle size of +100 mu m to obtain a dehydrated product with the particle size of +100 mu m;
the granulating device is used for granulating the obtained dehydrated product with the particle size of 100 mu m to obtain a granulated product with the particle size of 100 mu m;
the drying device is used for drying the obtained granulated product with the particle size of 100 mu m to obtain a dried particle product with the particle size of 100 mu m;
and the adsorption device is used for carrying out adsorption treatment on the coal gasification wastewater in the coal gasification process through the obtained +100 mu m dry particle product to obtain an adsorbed fine slag product and the coal gasification wastewater after the adsorption treatment.
The embodiment of the utility model provides an in, still include:
the ball milling device is used for crushing the obtained adsorbed fine slag product to obtain a ball milled product;
the pulping device is used for mixing the obtained ball-milled product with a water-coal-slurry additive for pulping to obtain a water-coal-slurry product; and the coal water slurry product is used for being fed into a gasification furnace for co-combustion.
In the embodiment of the utility model, the ball milling device is a ball mill or a rod mill;
the pulping device is a pulping stirring barrel.
The embodiment of the utility model provides an in, still include: and discharging the wastewater clear liquid after adsorption treatment to a biochemical pool, and performing further disinfection treatment according to a discharge standard.
In the embodiment of the utility model, the first grading device is a grading cyclone; the second grading device is a high-frequency vibrating screen or a curved screen; the concentration device is a thickener; the dehydration device is a vacuum belt conveyor or a filter press; the granulating device is a granulator; the drying device is a dryer; the adsorption device is an adsorption tank.
The embodiment of the utility model provides an in, still include: the gasification furnace is used for inputting coal to obtain gasified black water and synthesis gas; wherein, the coal gasification wastewater is produced in the process of processing the synthesis gas.
The embodiment of the utility model provides a coal gasification wastewater treatment method using gasified fine slag, which comprises the following steps:
step 1, concentrating and grading gasified black water obtained in a coal gasification process to obtain a-74 mu m overflow product and a +74 mu m underflow product;
step 2, grading the obtained underflow product with the size of +74 micrometers to obtain an oversize product with the size of +100 micrometers and an undersize product with the size of 100-74 micrometers;
step 3, concentrating the obtained overflow product with the size of minus 74 microns and a product under a sieve with the size of 100-74 microns to obtain a concentrated product with the size of minus 100 microns;
step 4, dehydrating the obtained-100 mu m concentrated product to obtain a-100 mu m dehydrated product; dehydrating the obtained product on the sieve with the particle size of +100 mu m to obtain a dehydrated product with the particle size of +100 mu m;
step 5, granulating the obtained dehydrated product with the particle size of +100 microns to obtain a granulated product with the particle size of +100 microns;
step 6, drying the obtained granulated product with the particle size of +100 microns to obtain a dried particle product with the particle size of +100 microns;
and 7, performing adsorption treatment on the coal gasification wastewater in the coal gasification process through the obtained +100 mu m dry particle product to obtain an adsorbed fine slag product and the coal gasification wastewater after the adsorption treatment.
The embodiment of the utility model provides an in, still include:
step 8, crushing the obtained adsorbed fine slag product to obtain a ball-milled product;
step 9, mixing the obtained ball-milled product with a coal water slurry additive for pulping to obtain a coal water slurry product; and the coal water slurry product is used for being fed into a gasification furnace for co-combustion.
The embodiment of the utility model provides an in, still include:
and step 10, discharging the coal gasification wastewater clear liquid adsorbed by the dried particle product with the particle size of +100 microns into a biochemical tank, and performing disinfection treatment according to the discharge standard.
In the embodiment of the utility model, the water-soluble,
step 1, feeding gasified black water obtained in the coal gasification process into a grading cyclone for concentration and grading;
in the step 2, feeding the obtained underflow product with the thickness of +74 mu m into a high-frequency vibrating screen for grading;
in the step 3, feeding the obtained overflow product with the size of minus 74 microns and the product with the size of 100-74 microns under a sieve into a thickener for concentration;
in step 4, dewatering is carried out through a vacuum belt conveyor;
granulating by a granulator in the step 5;
in step 6, drying by a dryer;
and 7, performing adsorption treatment through an adsorption tank.
Referring to fig. 1, a method for treating coal gasification wastewater by using gasified fine slag according to an embodiment of the present invention specifically includes the following steps:
step 1, feeding coal into a gasification furnace to obtain gasified black water and synthesis gas, wherein coal gasification wastewater is generated in the process of processing the synthesis gas;
step 2, feeding the gasified black water obtained in the step 1 into a grading cyclone for concentration and grading to obtain overflow products of-74 microns and underflow products of +74 microns (more than 74 microns);
step 3, feeding the underflow product with the size of 74 micrometers obtained in the step 2 into a high-frequency vibrating screen for grading to obtain an oversize product with the size of 100 micrometers and an undersize product with the size of 100-74 micrometers;
step 4, feeding the overflow product with the size of-74 microns obtained in the step 2 and the undersize product with the size of 100-74 microns obtained in the step 3 into a thickener to obtain a concentrated product with the size of-100 microns;
step 5, feeding the-100 mu m concentrated product obtained in the step 4 into a vacuum belt conveyor to obtain a-100 mu m dehydrated product;
step 6, feeding the-100 mu m dehydration product obtained in the step 5 into an ash landfill for storage treatment;
step 7, feeding the product on the sieve with the size of +100 microns obtained in the step 3 into a vacuum belt conveyor to obtain a dehydrated product with the size of +100 microns;
step 8, feeding the dehydrated product with the particle size of +100 microns obtained in the step 7 and a granulation additive into a granulator to obtain a granulated product with the particle size of +100 microns;
step 9, feeding the granulated product with the particle size of +100 microns obtained in the step 8 into a dryer to obtain a dried particle product with the particle size of +100 microns;
step 10, feeding the dried particle product with the particle size of +100 microns obtained in the step 9 into an adsorption tank, and performing adsorption treatment on the coal gasification wastewater obtained in the step 1 to obtain an adsorbed fine slag product; wherein, the coal gasification wastewater adsorbed by the dried particle product with the particle size of +100 μm can be further subjected to advanced treatment;
step 11, feeding the adsorbed fine slag product obtained in the step 10 into a ball mill to obtain a ball-milled product;
step 12, feeding the ball-milled product obtained in the step 11 and a coal water slurry additive into a pulping stirring barrel to obtain a coal water slurry product;
and step 13, feeding the coal water slurry product obtained in the step 12 into the gasification furnace in the step 1 for co-combustion.
Wherein, because the sieve that the device of sieving used is common, so the endpoint value is a critical value, both sides can be ascribed.
The embodiment of the utility model provides a principle of method does: the characteristics of large specific surface area and developed pores of coarse fraction of the fine coal gasification slag are fully utilized to perform adsorption treatment on the coal gasification wastewater generated in the same coal gasification production process, and the adsorbed fine gasification slag performs harmless treatment on pollutants in a combustion mode.
The data of the specific examples are shown in tables 1, 2 and 3.
TABLE 1 relationship between the coal gasification fine slag particle size fraction and ash content and specific surface area 1
| Particle size fraction/. mu.m | Ash content% | Specific surface area/(m)2/g) |
| +100 | 38.74 | 328.65 |
| 100-74 | 62.16 | 156.58 |
| -74 | 73.25 | 115.96 |
TABLE 2 relationship between the coal gasification fine slag particle size fraction and ash content and specific surface area 2
| Particle size fraction/. mu.m | Ash content% | Specific surface area/(m)2/g) |
| +100 | 29.14 | 475.32 |
| 100-74 | 58.54 | 200.13 |
| -74 | 70.22 | 128.39 |
TABLE 3 relationship between the coal gasification fine slag particle size fraction and the ash content and specific surface area 3
| Particle size fraction/. mu.m | Ash content% | Specific surface area/(m)2/g) |
| +100 | 40.14 | 300.12 |
| 100-74 | 63.69 | 147.32 |
| -74 | 78.44 | 105.83 |
As can be seen from tables 1 to 3, the specific surface area of the classified gasified fine slag shows different rules along with the particle size distribution, and the order of the specific surface area is as follows: +100 μm>100-74μm>74 μm, the specific surface area of +100 μm is significantly larger than that of other particle sizes, and the maximum value reaches 475.32m2Is more suitable for water treatment adsorption process.
Performing electron microscope analysis on a typical size fraction sample, and amplifying by 5000 times to obtain an electron microscope photo, wherein the pore structure can be visually seen; the surface pore structure of the gasified fine slag is developed, and the gasified fine slag mainly comprises a porous carbon layer and spherical mineral small particles. The porous shape will make the gasified fine slag have larger specific surface area, which is corresponding to the analysis result of the specific surface area.
To sum up, the embodiment of the utility model discloses a system and a method for treating coal gasification wastewater by utilizing gasified fine slag, coal gasification black water is concentrated and classified by a swirler and classified by a high-frequency vibrating screen, and fine grain products are buried after being concentrated and dehydrated in vacuum; and dehydrating, granulating and drying the screened coarse-grained product, using the granulated and dried product for adsorbing coal gasification wastewater generated in the coal gasification synthesis gas processing process, preparing coal water slurry from the adsorbed fine slag through a ball milling process, and returning the coal water slurry to a gasification furnace for blending combustion treatment. The utility model discloses a make full use of fine sediment coarse grain level of coal gasification characteristics big, the pore is flourishing, carries out adsorption treatment to the coal gasification waste water that produces in the same coal gasification production technology to the fine sediment of gasification after the absorption carries out innocent treatment to the pollutant through the combustion mode, and simple process, treatment effect are good, can effectively improve the utilization level of the resource of the fine sediment of gasification, and reduce the fine sediment of gasification and the pollution of coal gasification waste water to the environment, reach the purpose of same production process "treat waste with waste".
The above embodiments are only used to illustrate the technical solution of the present invention and not to limit the same, although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify or equally replace the specific embodiments of the present invention, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention is within the protection scope of the claims of the present invention.
Claims (8)
1. A coal gasification wastewater treatment system using gasified fine slag is characterized by comprising:
the first grading device is used for concentrating and grading the gasified black water obtained in the coal gasification process to obtain a-74 mu m overflow product and a +74 mu m underflow product;
the second grading device is used for grading the obtained underflow product with the particle size of 74 micrometers to obtain an oversize product with the particle size of 100 micrometers and an undersize product with the particle size of 100-74 micrometers;
the concentration device is used for concentrating the obtained overflow product with the size of minus 74 micrometers and the product with the size of 100-74 micrometers below the sieve to obtain a concentrated product with the size of minus 100 micrometers;
the dehydration device is used for dehydrating the obtained-100 mu m concentrated product to obtain a-100 mu m dehydrated product; used for dehydrating the obtained product on the sieve with the particle size of +100 mu m to obtain a dehydrated product with the particle size of +100 mu m;
the granulating device is used for granulating the obtained dehydrated product with the particle size of 100 mu m to obtain a granulated product with the particle size of 100 mu m;
the drying device is used for drying the obtained granulated product with the particle size of 100 mu m to obtain a dried particle product with the particle size of 100 mu m;
and the adsorption device is used for carrying out adsorption treatment on the coal gasification wastewater in the coal gasification process through the obtained +100 mu m dry particle product to obtain an adsorbed fine slag product and the coal gasification wastewater after the adsorption treatment.
2. The system for treating coal gasification wastewater using gasified fine slag according to claim 1, further comprising:
the ball milling device is used for crushing the obtained adsorbed fine slag product to obtain a ball milled product;
the pulping device is used for mixing the obtained ball-milled product with a water-coal-slurry additive for pulping to obtain a water-coal-slurry product; and the coal water slurry product is used for being fed into a gasification furnace for co-combustion.
3. The system for treating coal gasification wastewater by using gasified fine slag according to claim 2, wherein the ball mill is a ball mill or a rod mill;
the pulping device is a pulping stirring barrel.
4. The system for treating coal gasification wastewater using gasified fine slag according to claim 1, further comprising:
and the biochemical tank is used for disinfecting the wastewater clear liquid after adsorption treatment.
5. The system for treating coal gasification wastewater utilizing gasified fine slag according to claim 1, wherein the first classification device is a classification cyclone; the second grading device is a high-frequency vibrating screen or a curved screen.
6. The system for treating coal gasification wastewater utilizing gasified fine slag according to claim 1, wherein the concentration device is a thickener; the granulating device is a granulator; the drying device is a dryer; the adsorption device is an adsorption tank.
7. The system for treating coal gasification wastewater utilizing gasified fine slag according to claim 1, wherein the dewatering device is a vacuum belt conveyor or a filter press.
8. The system for treating coal gasification wastewater using gasified fine slag according to claim 1, further comprising:
the gasification furnace is used for inputting coal to obtain gasified black water and synthesis gas; wherein, the coal gasification wastewater is produced in the process of processing the synthesis gas.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113333436A (en) * | 2021-05-21 | 2021-09-03 | 中国矿业大学 | All-component comprehensive utilization method of coal gasification fine slag |
| CN114956244A (en) * | 2022-03-24 | 2022-08-30 | 中国矿业大学 | Coal gasification slag carbon ash separation and coal chemical industry wastewater combined treatment method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113333436A (en) * | 2021-05-21 | 2021-09-03 | 中国矿业大学 | All-component comprehensive utilization method of coal gasification fine slag |
| CN114956244A (en) * | 2022-03-24 | 2022-08-30 | 中国矿业大学 | Coal gasification slag carbon ash separation and coal chemical industry wastewater combined treatment method |
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