CN213141451U - High-efficient dewatering system of coal gasification fine slag black water of many energy field step distributions - Google Patents
High-efficient dewatering system of coal gasification fine slag black water of many energy field step distributions Download PDFInfo
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- CN213141451U CN213141451U CN202021956995.6U CN202021956995U CN213141451U CN 213141451 U CN213141451 U CN 213141451U CN 202021956995 U CN202021956995 U CN 202021956995U CN 213141451 U CN213141451 U CN 213141451U
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Abstract
The utility model discloses a coal gasification fine slag black water high-efficiency dehydration system with multi-energy field step distribution, which comprises a concentration tank, a ceramic vacuum filter, a vibration pressure dehydration device, a drum-type hot flue gas dryer, a wastewater purification device and a condensing device, wherein the concentration tank is connected with a feed inlet of the ceramic vacuum filter through a first centrifugal pump; the discharge port of the ceramic vacuum filter is connected with the inlet of the vibration pressure dehydration device through a first conveying belt and a distributing device; a discharge port of the vibration pressure dehydration device is connected with a feed port of the drum-type hot flue gas dryer through a second conveyor belt; the vibration pressure dehydration device is also connected with a wastewater purification device; the discharge port of the drum-type hot flue gas dryer is connected with a factory power boiler, and the exhaust port of the drum-type hot flue gas dryer is connected with a condensing device; the condensing device is connected with the waste water purifying device. The water content of the fine slag treated by the utility model is below 10-15%, which is easy to realize pulverization and convenient for subsequent resource utilization.
Description
Technical Field
The utility model belongs to the technical field of coal processing and clean utilization, especially, relate to a high-efficient dewatering system of coal gasification fine slag black water of many energy field step configurations.
Background
Coal is the primary energy with the most abundant storage amount and the widest distribution region on the earth. The data of the national statistical bureau show that 16666.7 million tons of existing coal resources exist in China in 2019, 28 million tons of standard coal are consumed in coal year, and the consumption amount of the standard coal accounts for about 60% of the total energy consumption. The existing energy consumption structure of China determines that coal resources play a significant role in national economy and social sustainable development of China. For a long time, the main mode of coal utilization in China is direct combustion, the combustion utilization rate is low, and toxic and harmful substances such as dust, carbon monoxide, sulfur dioxide, nitrogen dioxide and the like discharged in the combustion process seriously harm the ecological environment and human health.
The coal gasification technology is a technology that properly processed coal is fed into a gasification furnace, and an oxidant is introduced to perform a physical and chemical reaction with the coal under the conditions of certain temperature and pressure so as to convert the coal into ash and synthesis gas. The coal gasification technology is a core technology for clean and efficient conversion of coal, and technological processes such as coal machine chemical synthesis, coal-based liquid fuel, IGCC power generation, poly-generation systems, hydrogen production, fuel cells, direct reduction iron making and the like all need to take coal gasification as a source. In the coal gasification process, the coarse slag and the fine slag can be separated according to different ash slag discharge modes. The coarse slag is discharged from the bottom of the gasification furnace, and the fine particles carried by the synthesis gas are fine slag. In order to purify the syngas, the fine slag particles entrained with the syngas must be separated. At present, the main separation method is wet washing, the flow rate of the synthesis gas containing fine slag is gradually increased through a Venturi scrubber and collides with sprayed washing water at a high speed at a throat, the fine slag wrapped by the synthesis gas is wetted by the atomized washing water, and the fine slag is adhered, settled and aggregated with each other so as to be separated from the synthesis gas and generate gasified fine slag black water with the water content of more than 90 percent.
The water content of the fine slag is extremely difficult to directly utilize, and the fine slag is easy to vibrate and separate in the transportation process, so that the road environment is polluted. In addition, the fine slag black water also contains elements such as Cd, Cr, Pb and the like, and the direct stacking causes pollution to land and underground water. If the fine slag is subjected to water removal treatment, the fine slag can be mixed into a fluidized bed for combustion, so that the utilization rate of original coal is improved, and the method can also be used for resource utilization such as building backfill, cement production and the like. Therefore, the removal of water in the fine slag is the practical problem to be solved firstly, and the deep dehydration is a technical difficulty.
At present, a ceramic vacuum filter is mainly adopted to dehydrate coal gasification fine slag black water to obtain a fine slag filter cake with water content of about 43%, the water content is still high, and the subsequent utilization of fine slag is limited. As the gasified fine slag particles are fine, the particles with the diameter of below 70 mu m account for more than 60 percent, the water occurrence capacity is strong, and the traditional dehydration method with a single energy form has low efficiency and undesirable effect.
In conclusion, no better direct treatment method exists at present when the coal gasification fine slag black water is used as solid waste generated in the coal gasification process. The direct stacking or the landfill will damage the ecological environment, in addition, a large amount of moisture carried by the fine slag brings difficulty to the transportation process, and brings economic burden to enterprises, so the fine slag must be dehydrated first to achieve the separation of water and slag, and the resource utilization of the gasified fine slag black water can be realized. However, the existing dehydration technology is difficult to realize the efficient deep dehydration of the black water of the gasified fine slag, if an efficient and deep dehydration method of the gasified fine slag can be developed, the resource utilization of slag and water is realized, the direct economic benefit is brought to coal chemical enterprises, the ecological environment is improved, and the development concept that the green water mountain is the Jinshan Yinshan is met.
Disclosure of Invention
In order to overcome the limitation of the prior art, the utility model provides a high-efficient dewatering system of fine sediment black water of coal gasification of many energy field step configurations to realize the high-efficient dehydration of step of the fine sediment black water of coal gasification.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a coal gasification fine slag black water high-efficiency dehydration system with multi-energy field step distribution comprises a concentration tank, a ceramic vacuum filter, a vibration pressure dehydration device, a drum-type hot flue gas dryer, a wastewater purification device and a condensation device, wherein the concentration tank is connected with the ceramic vacuum filter;
the concentration tank is connected with a feed inlet of the ceramic vacuum filter;
the discharge port of the ceramic vacuum filter is connected with a first conveyor belt, and the output end of the first conveyor belt is connected with the inlet of the vibration pressure dehydration device;
the discharge port of the vibration pressure dehydration device is connected with a second conveyor belt, and the output end of the second conveyor belt is connected with the feed port of the drum-type hot flue gas dryer;
the discharge port of the drum-type hot flue gas dryer is connected with a factory power boiler, and the exhaust port of the drum-type hot flue gas dryer is connected with the air inlet of the condensing device;
and a water inlet and a water outlet of the condensing device are respectively connected with the wastewater purifying device.
And a first centrifugal pump is arranged in a connecting pipeline of the concentrating tank and the feed inlet of the ceramic vacuum filter.
The inlet of the vibration pressure dehydration device is provided with a material distribution device, the inlet of the material distribution device is connected with the output end of the first conveyor belt, and the outlet of the material distribution device is connected with the inlet of the vibration pressure dehydration device.
The vibration pressure dehydration device is also connected with a wastewater purification device.
And a second centrifugal pump is arranged in a connecting pipeline of the wastewater purification device and the water inlet of the condensation device.
Has the advantages that: the utility model provides a high-efficient dewatering system of thin sediment black water of coal gasification of many energy field step allocation, owing to carried out the analysis to the form of thin sediment occurrence moisture, judged moisture and thin sediment interact's characteristic, combined the advantage of various energy forms, adopted the dewatering device of different energy forms in the dehydration stage of difference, realized the branch ladder of the thin sediment of coal gasification, the high-efficient dehydration of degree of depth, considered the recycle to the thin sediment drainage of gasification simultaneously. Compared with the prior art, the method has the following advantages:
1. realizes the step and deep dehydration of the gasified fine slag. The high-efficiency dehydration system for the black water of the gasified fine slag, which is applied in the multi-energy field step mode, scientifically judges the difficulty of removing water in different stages of the gasified fine slag, reasonably and orderly combines the respective dehydration characteristics and advantages of a ceramic vacuum filter, a vibration pressure dehydration device and a rotary drum type vacuum dryer, realizes the step and deep dehydration of the gasified fine slag, and overcomes the defects of poor dehydration effect and incapability of deep dehydration of the traditional single force field dehydration process. The utility model discloses at first use ceramic vacuum filter, utilize the vacuum force to get rid of the unconjugated water of the overwhelming majority in the great gap between the fine slag granule, make moisture fall to 43%. Then, the fine slag is arranged more closely in the horizontal and vertical directions under the synergistic action of vibration force and pressure by using a vibration pressure dehydration device, so that the non-binding water in small gaps among fine slag particles is further removed. And finally, a drum-type hot flue gas dryer is used, and heat energy, hot flue gas and fine slag are used for heat and mass transfer. The water is gasified by heating, and is transferred to the surface of the gasified fine slag from the capillary tube and the micropore of the fine slag or is separated from the hydrophilic component of the fine slag and is taken out along with the flue gas, thereby removing part of the combined water for gasification.
2. The wastewater resources are recycled, and a foundation is laid for the subsequent resource utilization of the fine slag. The filtrate obtained by the ceramic vacuum filter is clear and can be directly used for backwashing water. The water removed by the vibration pressure dehydration device is collected to a wastewater purification device and can be used as industrial circulating water after purification. After the high-efficiency dewatering treatment, the moisture content of the fine slag is below 10-15%, and the fine slag can be used for resource utilization such as doped burning, building backfill, soil improvement, cement production and the like.
3. Low-quality heat energy is utilized, and the energy utilization rate is improved. The hot flue gas used by the drum-type hot flue gas dryer comes from a power boiler of a factory and is low-quality heat energy. Effectively utilizes the low-quality heat energy.
Drawings
Fig. 1 is a schematic structural view of the present invention;
in the figure: 1. a concentration tank; 2. a first centrifugal pump; 3. a ceramic vacuum filter; 4. a conveyor belt; 5. a material distribution device; 6. a vibration pressure dehydration device; 7. a drum-type hot flue gas dryer; 8. a wastewater purification device; 9. a condensing unit; 10. a plant power boiler; 27. a second centrifugal pump;
FIG. 2 is a schematic diagram of a ceramic vacuum filter;
in the figure: 11. a filter plate; 12. a vacuum pump; 13. a liquid discharge tank; 14. a backwash pump; 15. a feed inlet; 16. a discharge port;
FIG. 3 is a schematic view of a vibratory pressure apparatus;
in the figure: 17. a master cylinder piston; 18. a master cylinder cavity; 19. a vibration motor; 20. a hydraulic piston;
FIG. 4 is a schematic view of a drum hot flue gas dryer;
in the figure: 21. a feed inlet; 22. an air inlet; 23. shoveling plates; 24. a blower; 25. an exhaust port; 26. and (4) a discharge port.
Detailed Description
The present invention will be explained in detail with reference to the accompanying drawings.
As shown in figure 1, the coal gasification fine slag black water high-efficiency dehydration system with multi-energy field step distribution is characterized in that: comprises a concentration tank 1, a ceramic vacuum filter 3, a vibration pressure dehydration device 6, a drum-type hot flue gas dryer 7, a waste water purification device 8 and a condensing device 9, wherein the concentration tank is arranged in the middle of the ceramic vacuum filter;
the concentration tank 1 is connected with a feed inlet of a ceramic vacuum filter 3; a first centrifugal pump 2 is arranged in a connecting pipeline of the concentrating tank 1 and a feed inlet of the ceramic vacuum filter 3;
the discharge port of the ceramic vacuum filter 3 is connected with a first conveyor belt 4, and the output end of the first conveyor belt 4 is connected with the inlet of a vibration pressure dehydration device 6; a material distribution device 5 is arranged at the inlet of the vibration pressure dehydration device 6, the inlet of the material distribution device 5 is connected with the output end of the first conveyor belt 4, and the outlet of the material distribution device 5 is connected with the inlet of the vibration pressure dehydration device 6;
the discharge port of the vibration pressure dehydration device 6 is connected with a second conveyor belt 12, and the output end of the second conveyor belt 12 is connected with the feed port of the drum-type hot flue gas dryer 7; the vibration pressure dehydration device 6 is also connected with a wastewater purification device 8;
the discharge port of the drum-type hot flue gas dryer 7 is connected with a factory power boiler 10, and the exhaust port of the drum-type hot flue gas dryer 7 is connected with the air inlet of a condensing device 9;
a water inlet and a water outlet of the condensing device 9 are respectively connected with the wastewater purifying device 8 to form water circulation; a second centrifugal pump 27 is arranged in a connecting pipeline of the waste water purification device 8 and the water inlet of the condensing device 9.
The utility model discloses well adopted ceramic vacuum filter, vibration pressure dewatering device, hot flue gas desiccator of drum-type, waste water purification device, condensing equipment are current device, the utility model discloses do not do any improvement to its inner structure.
As shown in figure 2, the ceramic vacuum filter 3 comprises a vacuum pump 12, a liquid discharge tank 13, a back flush pump 14 and a shell, wherein the vacuum pump 12, the liquid discharge tank 13 and the back flush pump 14 are all connected with the shell, the shell is provided with a feed inlet 15 and a discharge outlet 16, and a filter plate 11 is arranged in the shell.
As shown in fig. 3, the vibration pressure dehydration device 6 is provided with a master cylinder piston 17, a master cylinder cavity 18, a vibration motor 19, and a hydraulic piston 20.
As shown in fig. 4, the drum-type hot flue gas dryer 7 is provided with a feed port 21, an air inlet 22, a shoveling plate 23, a blower 24, an exhaust port 25, and a discharge port 26, and the shoveling plate 23 is located in the drum-type hot flue gas dryer 7.
The utility model discloses a high-efficient dewatering system of thin sediment black water of coal gasification of many energy field step configurations, the application method is as follows:
step a, settling and concentrating coal gasification fine slag black water with the initial mass concentration of about 3% in a concentration tank 1 to 15-30%;
and b, conveying the concentrated black water to a slurry tank of a ceramic vacuum filter 3 by using a first centrifugal pump 2.
And c, immersing the ceramic filter plate 11 in a slurry area of the ceramic vacuum filter 3, allowing the ceramic filter plate to enter a slurry absorption area, adsorbing black water outside the microporous structure of the ceramic filter plate 11 under the action of vacuum force of more than 0.08MPa generated by a vacuum pump 12 to form a filter cake, allowing the filtrate to pass through the fine microporous structure of the ceramic filter plate, and allowing the filtrate to enter a distribution valve and flow into a liquid discharge tank 13. The filter plate with the filter cake attached enters a drying area under the drive of the rotating shaft, continues to be vacuumized and dehydrated for 1min, and also flows into a liquid discharge tank 13; the filter plate rotates along with the main shaft, the filter plate enters the discharging area, and the scraper scrapes off the attached filter cake to obtain a filter cake with water content of 43% and thickness of 3-7 mm. And then the filter plate is transferred into a backwashing area, filtrate obtained in the vacuumizing process is backwashed by a backwashing pump 14 from the inside of the ceramic filter plate 11 to the outside of fine slag particles blocked in the microporous structure, the microporous structure of the ceramic is cleaned, and a vacuum drying process is completed.
D, conveying the pasty filter cake to a distributing device 5 by using a conveying belt 4;
step e, the material distribution device 5 arranges the pasty filter cake in a main cylinder cavity 18 of the vibration pressure dehydration device 6;
and f, driving a main cylinder piston 17 of the vibration pressure dehydration device 6 to descend into a main cylinder cavity 18 filled with the paste filter cake under the drive of hydraulic oil, applying 10-12MPa of pressure to the paste filter cake, and maintaining the pressure for 3 min. When the pressure is constant, the two power vibration motors 19 rotate reversely to drive the eccentric block to vibrate, the vibration force is controlled to be 3-3.5MPa and the vibration frequency is 30-45Hz, fine slag particles become more compact under the synergistic action of the pressure and the vibration force to form a block filter cake with the water content of 30-32%, and water among the fine slag particles is extruded out and converged to the bottom of the main cylinder cavity 8, flows out from small holes densely distributed at the bottom and is conveyed to the wastewater purification device 8 through a pipeline. After the dehydration process is finished, the master cylinder piston releases pressure and returns, the vibration stops, and the hydraulic piston 20 positioned at the bottom of the master cylinder cavity 18 pushes the blocky filter cake upwards and reversely out of the cavity;
step g, conveying the blocky filter cakes to a drum-type hot flue gas dryer 7 by using a conveying belt 4;
and h, feeding the blocky filter cakes from a feeding hole 21 at the higher end of the rotary drum type hot flue gas dryer 7, and carrying out countercurrent contact with the hot flue gas at 240 ℃ entering from the air inlet 22 from the other end, wherein the rotary drum rotates at a speed of 4r/min, the blocky filter cakes are overturned and crushed along with the rotary drum, and are lifted by a lifting plate 23 arranged in the rotary drum and then fall, and the filter cake blocks become finer. In the process, the hot flue gas and the crushed filter cake transfer heat and mass, the flue gas carrying water vapor is pumped out from an exhaust port 25 by an air blower 24 arranged at one end of a feed port 21, the crushed filter cake moves from the feed port 21 at the higher end to a discharge port 26 at the lower end under the action of gravity, and after the drying process is finished, fine slag particles with the water content of below 10 percent are obtained;
step i, the flue gas pumped out from the exhaust port 25 by the blower 24 is transmitted to the condensing device 9 through a pipeline, a large amount of water vapor carried by the flue gas is condensed into liquid, and the liquid is converged and flows into the wastewater purification device 8;
and step j, mixing the gasified fine slag obtained from the discharge hole 26 of the drum dryer 7 into the fluidized bed for combustion, so that the loss of the fine slag is reduced, the energy utilization rate of coal is improved, the carbon content of the fine slag subjected to secondary mixing combustion is lower, the fine slag is easy to be used for cement production, and the dried gasified fine slag can be directly used for other resource utilization such as building backfill, soil improvement and the like.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. The utility model provides a high-efficient dewatering system of coal gasification fine slag black water that multi-energy field step was allocated which characterized in that: comprises a concentration tank (1), a ceramic vacuum filter (3), a vibration pressure dehydration device (6), a drum-type hot flue gas dryer (7), a waste water purification device (8) and a condensing device (9), wherein;
the concentration tank (1) is connected with a feed inlet of the ceramic vacuum filter (3);
the discharge hole of the ceramic vacuum filter (3) is connected with a first conveyor belt (4), and the output end of the first conveyor belt (4) is connected with the inlet of a vibration pressure dehydration device (6);
a discharge port of the vibration pressure dehydration device (6) is connected with a second conveyor belt (12), and an output end of the second conveyor belt (12) is connected with a feed port of the drum-type hot flue gas dryer (7);
a discharge port of the drum-type hot flue gas dryer (7) is connected with a factory power boiler (10), and an exhaust port of the drum-type hot flue gas dryer (7) is connected with an air inlet of a condensing device (9);
and a water inlet and a water outlet of the condensing device (9) are respectively connected with the wastewater purification device (8).
2. The coal gasification fine slag black water high-efficiency dehydration system with multi-energy field step distribution according to claim 1 is characterized in that: and a first centrifugal pump (2) is arranged in a connecting pipeline of the concentrating tank (1) and a feed inlet of the ceramic vacuum filter (3).
3. The coal gasification fine slag black water high-efficiency dehydration system with multi-energy field step distribution according to claim 1 is characterized in that: the inlet of the vibration pressure dehydration device (6) is provided with a material distribution device (5), the inlet of the material distribution device (5) is connected with the output end of the first conveyor belt (4), and the outlet of the material distribution device (5) is connected with the inlet of the vibration pressure dehydration device (6).
4. The coal gasification fine slag black water high-efficiency dehydration system with multi-energy field step distribution according to claim 1 is characterized in that: the vibration pressure dehydration device (6) is also connected with a waste water purification device (8).
5. The coal gasification fine slag black water high-efficiency dehydration system with multi-energy field step distribution according to claim 1 is characterized in that: and a second centrifugal pump (27) is arranged in a connecting pipeline of the wastewater purification device (8) and the water inlet of the condensing device (9).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021956995.6U CN213141451U (en) | 2020-09-09 | 2020-09-09 | High-efficient dewatering system of coal gasification fine slag black water of many energy field step distributions |
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| CN202021956995.6U CN213141451U (en) | 2020-09-09 | 2020-09-09 | High-efficient dewatering system of coal gasification fine slag black water of many energy field step distributions |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114474819A (en) * | 2022-01-12 | 2022-05-13 | 中国矿业大学 | Device and method for quickly dehydrating coal gasification fine slag and demolding molded blocks by continuously applying vacuum force and pressure |
| CN116294533A (en) * | 2023-03-15 | 2023-06-23 | 中国矿业大学 | Gasification fine slag dehydration method for multi-energy field gradient treatment intelligent decision |
-
2020
- 2020-09-09 CN CN202021956995.6U patent/CN213141451U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114474819A (en) * | 2022-01-12 | 2022-05-13 | 中国矿业大学 | Device and method for quickly dehydrating coal gasification fine slag and demolding molded blocks by continuously applying vacuum force and pressure |
| CN116294533A (en) * | 2023-03-15 | 2023-06-23 | 中国矿业大学 | Gasification fine slag dehydration method for multi-energy field gradient treatment intelligent decision |
| CN116294533B (en) * | 2023-03-15 | 2024-05-17 | 中国矿业大学 | Gasification fine slag dehydration method for multi-energy field gradient treatment intelligent decision |
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