Secondary drying treatment system for gasified fine slag

Abstract

The utility model provides a secondary drying treatment system for gasified fine slag, and belongs to the technical field of coal chemical industry. The problems that the gasified fine slag is high in moisture content, prone to blocking a pipeline during conveying, difficult to burn out and likely to generate adverse effects after being fed into a boiler for blending combustion are solved. In the gasification fine slag secondary drying treatment system, a vacuum pump is communicated with a slag bin, an electric heater is arranged in the slag bin, a vibrator is arranged in the slag bin, a feeding port of a roller dryer is communicated with a discharging port of the slag bin, a discharging port of the roller dryer is communicated with a feeding port of a gas-solid separation device, and a solid outlet of the gas-solid separation device is communicated with a boiler. And a gas outlet of the gas-solid separation device is communicated with the smoke exhaust device. According to the secondary drying treatment system for the gasified fine slag, a novel vacuum drying technology and a roller drying technology are adopted, the gasified fine slag is subjected to secondary drying, drying is more sufficient, and the water content of the gasified fine slag can be effectively reduced, so that the burnout level of the gasified fine slag is effectively improved, and the problem that the gasified fine slag is difficult to burn is solved.

Description

Technical Field

[0001] The utility model belongs to the field of coal chemical industry, and particularly relates to a secondary drying and disposal system for gasification fine slag. Background Art

[0002] Data from the "China Bulk Industrial Solid Waste Comprehensive Utilization Industry Development Report" shows that my country's gasification slag production in 2021 was 71 million tons, and the comprehensive utilization rate of resources was only 31.6%. Gasification slag can be divided into coarse slag and fine slag according to particle size. During the gasification process, part of the slag is cooled to form larger particles and discharged from the bottom of the gasifier. This part is gasification coarse slag, accounting for about 80% of the total slag discharge; the other part of the slag is brought out by the synthesis gas, and the gasification fine slag with smaller particle size (mostly below 0.5mm) is separated through the gas purification device, and its shape is close to ash and powder.

[0003] At present, the treatment of gasified slag is lagging behind, and the comprehensive utilization rate is low. Among them, the gasified coarse slag is similar to the composition of boiler ash, with a carbon content of about 10%. It can be used by mixing it into road building materials and raw materials for making cement. The treatment method is relatively simple. However, since the gasified fine slag contains a lot of unburned carbon, with a carbon content of 30%-50%, and a small particle size and a high moisture content (about 60%), it does not meet the national standards and industry standards for building mixed raw materials, and cannot be used as a resource. It is usually treated by stacking, landfilling or transporting it into a boiler for combustion. However, when the gasified fine slag is transported into a boiler for combustion, due to the high moisture content of the gasified fine slag, which may reach more than 50%, it is easy to block the pipeline during transportation, affecting the safe operation of the boiler. At the same time, due to the high moisture content, it is difficult to burn out, and it may have adverse effects after being sent to the boiler for mixing and burning. Utility Model Content

[0004] In view of this, in order to solve the problem that the gasification fine slag has high moisture content, which easily blocks the pipeline during transportation and affects the safe operation of the boiler, and at the same time, due to the high moisture content, it is difficult to burn out and may have adverse effects after being sent to the boiler for mixed combustion, the utility model proposes a secondary drying and disposal system for gasification fine slag.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A secondary drying and disposal system for gasification fine slag, comprising:

[0007] Slag bin;

[0008] A vacuum pump, the vacuum pump being in communication with the slag bin;

[0009] An electric heater, wherein the electric heater is disposed in the slag bin;

[0010] A rapper, the rapper is arranged in the slag bin

[0011] A drum dryer, wherein the feed port of the drum dryer is connected to the slag discharge door of the slag bin;

[0012] A gas-solid separation device, a boiler and a smoke exhaust device, wherein the discharge port of the drum dryer is connected to the feed port of the gas-solid separation device, the solid outlet of the gas-solid separation device is connected to the boiler, and the gas outlet of the gas-solid separation device is connected to the smoke exhaust device.

[0013] As a preferred solution of the above-mentioned gasification fine slag secondary drying and disposal system, the gasification fine slag secondary drying and disposal system further includes a vacuum sensor, and the vacuum sensor is arranged in the slag bin.

[0014] As a preferred solution of the above-mentioned gasification fine slag secondary drying treatment system, the gasification fine slag secondary drying treatment system further includes a moisture analyzer, and the moisture analyzer is arranged in the slag bin.

[0015] As a preferred solution of the above-mentioned gasification fine slag secondary drying disposal system, the gasification fine slag secondary drying disposal system also includes a filtering device, which is arranged in the slag bin, and is configured to allow the moisture in the slag bin to flow out from the filtering device through the filtering device, and the solids in the slag bin to be discharged from the slag discharge door of the slag bin.

[0016] As a preferred solution of the above-mentioned gasification fine slag secondary drying treatment system, the gasification fine slag secondary drying treatment system further includes a water storage tank, and the water storage tank is connected to the filtering device.

[0017] As a preferred solution of the above-mentioned gasification fine slag secondary drying disposal system, the water storage tank is provided with a liquid level meter.

[0018] As a preferred solution of the above-mentioned gasification fine slag secondary drying disposal system, the gasification fine slag secondary drying disposal system also includes a first pipeline, a second pipeline and a third pipeline, one end of the first pipeline is connected to the filtering device, the second pipeline and the third pipeline are both connected to the other end of the first pipeline, the second pipeline is connected to the vacuum pump, the third pipeline is connected to the water storage tank, and the second pipeline is provided with a control valve.

[0019] As a preferred solution of the above-mentioned gasification fine slag secondary drying treatment system, the gasification fine slag secondary drying treatment system also includes a fan, the inlet of the fan is connected to the boiler, and the outlet of the fan is connected to the drum dryer.

[0020] As a preferred solution of the above-mentioned gasification fine slag secondary drying disposal system, the gasification fine slag secondary drying disposal system also includes a dust removal device, the inlet of the dust removal device is connected to the gas outlet of the gas-solid separation device, the gas outlet of the dust removal device is connected to the smoke exhaust device, and the solid outlet of the dust removal device is connected to the boiler.

[0021] As a preferred solution of the above-mentioned gasification fine slag secondary drying disposal system, the dust removal device adopts a bag dust collector.

[0022] Compared with the prior art, the beneficial effects of the gasification fine slag secondary drying treatment system provided by the utility model are:

[0023] 1. The utility model provides a secondary drying system for gasification fine slag, which adopts a secondary drying system of novel vacuum drying technology and drum drying technology, and can effectively reduce the water content of gasification fine slag, thereby effectively improving the burnout level of gasification fine slag, solving the problem of difficult combustion of gasification fine slag, reducing the adverse effects that may be caused after being sent to the boiler for blending, and helping to promote the realization of clean combustion disposal of gasification fine slag.

[0024] 2. The utility model provides a secondary drying treatment system for gasified fine slag. The vacuum pump, electric heater and vibrator work together to speed up the drying time of the gasified fine slag in the slag bin, achieve better drying effect, and can dry the moisture content to below 25%, which is convenient for subsequent secondary drying.

[0025] 3. The utility model provides a secondary drying and disposal system for gasified fine slag, which uses a fan to extract the high-temperature flue gas generated by the coal-fired boiler into the drum dryer, provides a heat source for the drum dryer, and performs secondary drying on the gasified wet slag, which can dry the moisture content to less than 10%, making the drying more complete and reducing the adverse effects that may be caused after being sent to the boiler for mixing and burning.

[0026] 4. The gasification fine slag secondary drying disposal system provided by the utility model can be directly modified for the existing slag bin, with low modification work volume, small space occupation, stable structure and easy maintenance, which can effectively reduce the drying cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0028] Figure 1 It is a structural schematic diagram of a gasification fine slag secondary drying disposal system provided in a specific embodiment of the utility model.

[0029] In the figure:

[0030] 1. Slag bin; 2. Vacuum pump; 3. Vibrator; 4. Electric heater; 5. Filter device; 6. Drum dryer; 7. Gas-solid separation device; 8. Dust removal device; 9. Smoke exhaust device; 10. Boiler; 11. Fan; 12. Water storage tank; 13. Liquid level meter; 14. First pipeline; 15. Second pipeline; 16. Third pipeline; 17. Control valve; 18. Vacuum sensor; 19. Moisture analyzer. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely explain the technical solutions in the embodiments of the utility model. It should be noted that the embodiments and features in the embodiments of the utility model can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the utility model, not all of the embodiments.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] See also Figure 1Description of this embodiment. The utility model provides a secondary drying treatment system for gasified fine slag, which includes a slag bin 1, a vacuum pump 2, an electric heater 4, a vibrator 3, a drum dryer 6, a gas-solid separation device 7, a boiler 10 and a smoke exhaust device 9. The vacuum pump 2 is connected to the slag bin 1, the electric heater 4 is arranged in the slag bin 1, the vibrator 3 is arranged in the slag bin 1, the feed port of the drum dryer 6 is connected to the slag discharge door of the slag bin 1, the discharge port of the drum dryer 6 is connected to the feed port of the gas-solid separation device 7, the solid outlet of the gas-solid separation device 7 is connected to the boiler 10, and the gas outlet of the gas-solid separation device 7 is connected to the smoke exhaust device 9.

[0036] The gasified fine slag secondary drying disposal system extracts air from the slag bin 1 through the vacuum pump 2, changes the pressure conditions in the slag bin 1, makes the slag bin 1 in a vacuum state, and accelerates the drying of wet slag under the action of the vibrator 3. The electric heater 4 can provide a high temperature environment for the slag bin 1 to achieve rapid drying of the wet slag. The vacuum pump 2, the electric heater 4 and the vibrator 3 work together to speed up the drying time and achieve better drying effect. The gasified fine slag is preliminarily dried in the slag bin 1, and its water content can be dried to less than 25%. The preliminarily dried gasified fine slag enters the drum dryer 6 for secondary drying, and the water content of the gasified fine slag can be dried to less than 10%. The gasified fine slag after drying is separated by the gas-solid separation device 7, and the separated gas is discharged through the smoke exhaust device 9. The separated solid coal-fired boiler 10 is burned and utilized. The gasified fine slag secondary drying disposal system adopts new vacuum drying technology and drum drying technology to perform secondary drying on the gasified fine slag, which is more fully dried and can effectively reduce the water content of the gasified fine slag, thereby effectively improving the burnout level of the gasified fine slag, solving the problem of the difficulty in burning the gasified fine slag, reducing the adverse effects that may be caused after being sent to the boiler 10 for mixing and burning, and helping to promote the clean combustion disposal of the gasified fine slag. In addition, the gasified fine slag secondary drying disposal system can directly modify the existing slag bin 1, with low modification engineering, small space occupation, stable structure and easy maintenance, which can effectively reduce the drying cost.

[0037] Optionally, the gasification fine slag secondary drying treatment system further comprises a vacuum sensor 18, which is arranged in the slag bin 1. The vacuum sensor 18 can detect the internal vacuum degree of the slag bin so as to make timely adjustments.

[0038] Optionally, the gasified fine slag secondary drying treatment system further comprises a moisture analyzer 19, which is disposed in the slag bin 1. The moisture analyzer 19 can monitor the moisture content of the gasified fine slag in the slag bin 1.

[0039] Optionally, the secondary drying and disposal system for gasified fine slag further comprises a filter device 5, which is disposed in the slag bin 1, and is configured to allow the water in the slag bin 1 to flow out from the filter device 5 through the filter device 5, and the solid in the slag bin 1 to be discharged from the slag discharge door of the slag bin 1. The filter device 5 can filter the gasified fine slag in the slag bin 1, separate the water and the solid, and the solid enters the drum dryer 6 through the slag discharge door. Optionally, the secondary drying and disposal system for gasified fine slag further comprises a water storage tank 12, which is connected to the filter device 5. After being filtered by the filter device 5, the water enters the water storage tank 12.

[0040] Optionally, the water storage tank 12 is provided with a liquid level meter 13. The liquid level in the water storage tank 12 is judged according to the liquid level meter 13, and the water is discharged uniformly after being filled.

[0041] Optionally, the gasification fine slag secondary drying disposal system further includes a first pipeline 14, a second pipeline 15 and a third pipeline 16, one end of the first pipeline 14 is connected to the filter device 5, the second pipeline 15 and the third pipeline 16 are both connected to the other end of the first pipeline 14, the second pipeline 15 is connected to the vacuum pump 2, the third pipeline 16 is connected to the water storage tank 12, and the second pipeline 15 is provided with a control valve 17. When the vacuum pump 2 is used to extract air in the slag bin 1, the control valve 17 of the second pipeline is opened, and the control valve 17 of the second pipeline is closed after the extraction is completed.

[0042] Optionally, the secondary drying treatment system for gasified fine slag further includes a fan 11, the inlet of the fan 11 is connected to the boiler 10, and the outlet of the fan 11 is connected to the drum dryer 6. The high-temperature flue gas is extracted from the tail of the boiler 10 through the fan 11 and used as the heat source of the drum dryer 6 to perform secondary drying on the gasified fine slag.

[0043] Optionally, the gasified fine slag secondary drying disposal system further includes a dust removal device 8, the inlet of the dust removal device 8 is connected to the gas outlet of the gas-solid separation device 7, the gas outlet of the dust removal device 8 is connected to the smoke exhaust device 9, and the solid outlet of the dust removal device 8 is connected to the boiler 10. The gas separated by the gas-solid separation device 7 is dusted by the dust removal device 8, and the gasified fine slag solids generated after the dust removal treatment and the gasified fine slag solids separated by the gas-solid separation device 7 are sent to the coal-fired boiler 10 for combustion and utilization.

[0044] Specifically, the dust removal device 8 adopts a bag dust collector.

[0045] Obviously, the embodiments of the utility model disclosed above are only used to help illustrate the utility model. The embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. According to the content of this specification, many modifications and changes can be made. This specification selects and describes these embodiments in detail in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can understand and use the utility model well. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the scope of protection of the claims of the utility model.

Claims

1. A secondary drying and disposal system for gasification fine slag, characterized in that: include: Slag bin (1); A vacuum pump (2), the vacuum pump (2) being in communication with the slag bin (1); An electric heater (4), wherein the electric heater (4) is arranged in the slag bin (1); A rapper (3), wherein the rapper (3) is arranged in the slag bin (1); A drum dryer (6), wherein a feed port of the drum dryer (6) is connected to a slag discharge door of the slag bin (1); A gas-solid separation device (7), a boiler (10) and a smoke exhaust device (9); the discharge port of the drum dryer (6) is connected to the feed port of the gas-solid separation device (7); the solid outlet of the gas-solid separation device (7) is connected to the boiler (10); and the gas outlet of the gas-solid separation device (7) is connected to the smoke exhaust device (9).

2. The gasification fine slag secondary drying treatment system according to claim 1, characterized in that: It also comprises a vacuum sensor (18), which is arranged in the slag bin (1).

3. The gasification fine slag secondary drying treatment system according to claim 1, characterized in that: It also comprises a moisture analyzer (19), wherein the moisture analyzer (19) is arranged in the slag bin (1).

4. The gasification fine slag secondary drying treatment system according to claim 1, characterized in that: The invention also comprises a filtering device (5), wherein the filtering device (5) is arranged in the slag bin (1), and the filtering device (5) is configured to allow moisture in the slag bin to flow out of the filtering device (5) through the filtering device (5), and solids in the slag bin to be discharged from a slag discharge door of the slag bin (1).

5. The gasification fine slag secondary drying treatment system according to claim 4, characterized in that: It also includes a water storage tank (12), wherein the water storage tank (12) is in communication with the filtering device (5).

6. The gasification fine slag secondary drying treatment system according to claim 5, characterized in that: The water storage tank (12) is provided with a liquid level meter (13).

7. The gasification fine slag secondary drying treatment system according to claim 5, characterized in that: The invention also comprises a first pipeline (14), a second pipeline (15) and a third pipeline (16); one end of the first pipeline (14) is connected to the filtering device (5); the second pipeline (15) and the third pipeline (16) are both connected to the other end of the first pipeline (14); the second pipeline (15) is connected to the vacuum pump (2); the third pipeline (16) is connected to the water storage tank (12); and the second pipeline (15) is provided with a control valve (17).

8. The gasification fine slag secondary drying treatment system according to claim 1, characterized in that: It also comprises a fan (11), the inlet of the fan (11) is connected to the boiler (10), and the outlet of the fan (11) is connected to the drum dryer (6).

9. The gasification fine slag secondary drying treatment system according to claim 1, characterized in that: It also includes a dust removal device (8), the inlet of the dust removal device (8) is connected to the gas outlet of the gas-solid separation device (7), the gas outlet of the dust removal device (8) is connected to the smoke exhaust device (9), and the solid outlet of the dust removal device (8) is connected to the boiler (10).

10. The gasification fine slag secondary drying treatment system according to claim 9, characterized in that: The dust removal device (8) adopts a bag dust collector.

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