Multi-stage drying gasification ash residue coupling coal-fired unit absorption system
By designing a multi-stage drying gasified ash slag coupled coal-fired unit consumption system, the universal problems of different gasification processes, gasification conditions and the treatment of ash slag under the coal for gasification are solved, and large-scale drying and multi-stage absorption of gasified ash slag is achieved, which is suitable for a variety of process conditions.
Patent Information
- Application Number
- CN202421569748.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-04
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-07-04
AI Technical Summary
The prior art lacks a universal large-scale solution to handle the drying and absorption of gasified ash slag generated under different gasification processes, gasification conditions and gasification coal.
A multi-stage drying gasified ash and slag coupled coal-fired unit absorption system is designed, including a drying system, adiabatic circulating fluidized bed, a cyclone separator, a heat exchanger, ash slag combustion system and a pulverized coal boiler. The system reduces the moisture of the ash slag through primary and secondary drying treatments, and combines the combustion and separation technology of the adiabatic circulation fluidized bed and cyclone separator to carry out multi-stage absorption of the gasified ash slag.
Large-scale drying and multi-stage absorption treatment of gasified ash slag is achieved, suitable for different gasification processes, gasification conditions and gasification coal, which is universal and effectively solves the problem of ash slag utilization.
Smart Images
Figure CN222799006U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of coal chemical industry, in particular to a multi-stage drying gasification ash slag coupling coal-fired unit consumption system. Background Art
[0002] In recent years, coal chemical industry, led by coal gasification, has developed rapidly. Projects such as coal-to-gas, coal-to-oil, coal-to-olefins, and coal-to-methanol have emerged one after another, and a large amount of ash has been generated. According to statistics, the million-ton coal chemical process will produce about 900,000 tons of ash (wet slag) each year. Gasification ash is formed under high-temperature reactions dominated by partial oxidation of coal and reduction. The formation process is quite different from that of fly ash in ordinary power plants, resulting in its composition and structure being different from fly ash. In addition, due to differences in gasification processes, gasification conditions, and coal used for gasification, the composition and structure of gasification ash vary greatly, which also brings considerable difficulties to its utilization. So far, there is no universal large-scale disposal solution for drying and disposing of gasification ash for different gasification processes, gasification conditions, and coal used for gasification. Utility Model Content
[0003] In view of this, in order to solve the problem that there is no universal large-scale disposal solution for gasification ash drying and disposal for different gasification processes, gasification conditions and gasification coal, the utility model proposes a multi-stage drying gasification ash coupling coal-fired unit disposal system.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] A multi-stage drying and gasification ash-slag coupling coal-fired unit disposal system, comprising:
[0006] Drying system;
[0007] an adiabatic circulating fluidized bed, the adiabatic circulating fluidized bed being in communication with the drying system;
[0008] A cyclone separator, wherein a feed inlet of the cyclone separator is connected to a flue gas outlet of the adiabatic circulating fluidized bed, and a solid outlet of the cyclone separator is connected to a slag return port of the adiabatic circulating fluidized bed;
[0009] A heat exchanger, a fan and an ash bin, wherein the gas outlet of the cyclone separator is connected to the hot air inlet of the heat exchanger, the hot air outlet of the heat exchanger is connected to the ash bin, and the cold air inlet of the heat exchanger is connected to the fan;
[0010] The ash combustion system and the pulverized coal boiler, the cold air outlet of the heat exchanger is connected to the ash combustion system, and the ash combustion system is connected to the pulverized coal boiler.
[0011] As a preferred solution of the above-mentioned multi-stage drying gasification ash coupled coal-fired unit disposal system, the drying system includes a primary drying device and a secondary drying device, the primary drying device is connected to the secondary drying device, and the secondary drying device is connected to the adiabatic circulating fluidized bed.
[0012] As a preferred solution of the above-mentioned multi-stage drying gasification ash and slag coupled with coal-fired unit disposal system, the high-temperature flue gas outlet of the pulverized coal boiler is connected to the drying system.
[0013] As a preferred solution of the above-mentioned multi-stage drying gasification ash coupled coal-fired unit disposal system, it also includes a dust removal device, the inlet of the dust removal device is connected to the hot air outlet of the heat exchanger, and the outlet of the dust removal device is connected to the ash bin.
[0014] As a preferred solution of the above-mentioned multi-stage drying gasification ash coupled coal-fired unit disposal system, the fan is connected to the heat exchanger through a first pipeline, and the first pipeline is provided with a cold air electric valve.
[0015] As a preferred solution of the above-mentioned multi-stage drying gasification ash coupled coal-fired unit disposal system, it also includes a buffer bin, the inlet of the buffer bin is connected to the ash bin, and the outlet of the buffer bin is connected to the ash combustion system.
[0016] As a preferred solution of the above-mentioned multi-stage drying gasification ash coupled coal-fired unit disposal system, the ash bin and the buffer bin are connected through a second pipeline, and the second pipeline is provided with an ash bin discharge valve.
[0017] As a preferred solution of the above-mentioned multi-stage drying gasification ash coupled coal-fired unit disposal system, it also includes an ejection pipeline and an auxiliary air pipeline, the two ends of the ejection pipeline are respectively connected to the hot air outlet of the heat exchanger and the ash combustion system, the outlet of the buffer bin is connected to the ejection pipeline, and the two ends of the auxiliary air pipeline are respectively connected to the hot air outlet of the heat exchanger and the ash combustion system.
[0018] As a preferred solution of the above-mentioned multi-stage drying gasification ash coupled coal-fired unit disposal system, the ejection pipeline and the auxiliary air pipeline are both provided with hot air electric valves.
[0019] As a preferred solution of the above-mentioned multi-stage drying gasification ash coupled coal-fired unit disposal system, the outlet of the buffer bin is connected to the injection pipeline through a third pipeline, and the third pipeline is provided with a hopper discharge valve.
[0020] Compared with the prior art, the multi-stage drying gasification ash slag coupled coal-fired unit consumption system provided by the utility model has the following beneficial effects:
[0021] 1. The utility model provides a multi-stage drying gasification ash coupled coal-fired unit disposal system. The wet ash enters the drying system for drying. The dried gasified ash is mixed with coal powder in an adiabatic circulating fluidized bed to dispose of the gasified ash for the first time. The unburned ash enters the cyclone separator. The large ash particles are returned to the adiabatic circulating fluidized bed through the ash return pipe to continue burning. The small ash particles enter the heat exchanger with the high-temperature flue gas for cooling. Then, they enter the ash combustion system for combustion, which helps the ash to burn out and be disposed of for the second time. The multi-stage drying gasification ash coupled coal-fired unit disposal system can perform large-scale drying and multi-stage disposal of gasified ash. It is suitable for different gasification processes, gasification conditions and coal for gasification, and has universal applicability.
[0022] 2. The utility model provides a multi-stage drying gasification ash coupled coal-fired unit disposal system, which is provided with a primary drying device and a secondary drying device. Through the two-stage drying treatment, high-moisture ash can be dried to reduce the moisture content of the ash from 50% to about 20%.
[0023] 3. The utility model provides a multi-stage drying gasification ash slag coupled coal-fired unit disposal system, which is provided with a buffer bin, which is arranged between the ash bin and the ash slag combustion system. Small ash particles enter the buffer bin from the ash bin, and a large amount of small ash particles are stored in the buffer bin. Adding a buffer bin can ensure the continuity of feeding into the ash slag combustion system. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] 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:
[0025] Figure 1 It is a structural schematic diagram of a multi-stage drying and gasification ash and slag coupled coal-fired unit consumption system provided by a specific embodiment of the utility model.
[0026] In the figure:
[0027] 1. Primary drying device; 2. Secondary drying device; 3. Adiabatic circulating fluidized bed; 4. Cyclone separator; 5. Heat exchanger; 6. Dust removal device; 7. Ash bin; 8. Buffer bin; 9. Ash combustion system; 10. Pulverized coal boiler; 11. Fan; 12. Cold air electric valve; 13. Hot air electric valve; 14. Ejection pipeline; 15. Auxiliary air pipeline; 16. Ash bin discharge valve; 17. Hopper discharge valve; 18. Wet ash inlet; 19. Coal inlet. DETAILED DESCRIPTION
[0028] 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.
[0029] 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.
[0030] 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.
[0031] 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.
[0032] See also Figure 1Description of this embodiment. The utility model provides a multi-stage drying gasification ash-slag coupled coal-fired unit disposal system, which includes a drying system, an adiabatic circulating fluidized bed 3, a cyclone separator 4, a heat exchanger 5, a fan 11, an ash bin 7, an ash combustion system 9 and a pulverized coal boiler 10. The adiabatic circulating fluidized bed 3 is connected to the drying system, the feed inlet of the cyclone separator 4 is connected to the flue gas outlet of the adiabatic circulating fluidized bed 3, the solid outlet of the cyclone separator 4 is connected to the slag return port of the adiabatic circulating fluidized bed 3, the gas outlet of the cyclone separator 4 is connected to the hot air inlet of the heat exchanger 5, the hot air outlet of the heat exchanger 5 is connected to the ash bin 7, the cold air inlet of the heat exchanger 5 is connected to the fan 11, the cold air outlet of the heat exchanger 5 is connected to the ash combustion system 9, and the ash combustion system 9 is connected to the pulverized coal boiler 10.
[0033] The multi-stage drying gasified ash is coupled with the coal-fired unit consumption system. The gasified ash is dried by the drying system to reduce the moisture. The dried gasified ash enters the adiabatic circulating fluidized bed 3. The adiabatic circulating fluidized bed 3 has a coal inlet 19. The coal powder enters the adiabatic circulating fluidized bed 3 from the coal inlet 19. The dried gasified ash and coal powder are burned in the adiabatic circulating fluidized bed 3. The gasified ash is consumed for the first time. The mixture produced after combustion enters the cyclone separator 4. The cyclone separator 4 separates the unburned fly ash and gasified slag particles in the adiabatic circulating fluidized bed 3. The large ash particles return to the adiabatic circulating fluidized bed 3 through the slag return pipe to continue burning. The small ash particles and the flue gas after combustion enter the heat exchanger 5 together. After cooling in the heat exchanger 5, they enter the ash bin 7 and finally enter the ash combustion system 9 for combustion and the second consumption. The heat exchanger 5 also heats the cold air, and the heated cold air enters the ash combustion system 9. The multi-stage drying gasification ash coupled coal-fired unit disposal system can carry out large-scale drying and multi-stage disposal of gasification ash, is suitable for different gasification processes, gasification conditions and gasification coal, and has universal applicability.
[0034] It can be understood that the heat exchange between the cold air and the hot air in the heat exchanger 5 can cool the hot air on the one hand and heat the cold air on the other hand.
[0035] Optionally, the fan 11 is connected to the heat exchanger 5 through a first pipeline, and the first pipeline is provided with a cold air electric valve 12. The fan 11 provides a source of cold air, and the cold air electric valve 12 can control the opening and closing of the first pipeline.
[0036] Optionally, the multi-stage drying gasification ash coupled coal-fired unit disposal system further includes a buffer bin 8, the inlet of the buffer bin 8 is connected to the ash bin 7, and the outlet of the buffer bin 8 is connected to the ash combustion system 9. Small ash particles enter the buffer bin 8 from the ash bin 7, and a large amount of small ash particles are stored in the buffer bin 8. Adding the buffer bin 8 can ensure the continuity of feeding into the ash combustion system 9.
[0037] Optionally, the multi-stage dry gasification ash coupled coal-fired unit disposal system further includes an ejector pipeline 14 and an auxiliary air pipeline 15, the two ends of the ejector pipeline 14 are respectively connected to the hot air outlet of the heat exchanger 5 and the ash combustion system 9, the outlet of the buffer bin 8 is connected to the ejector pipeline 14, and the two ends of the auxiliary air pipeline 15 are respectively connected to the hot air outlet of the heat exchanger 5 and the ash combustion system 9. The hot air in the ejector pipeline 14 uses high-speed ejection to carry small particles of ash falling from the buffer bin 8 into the ash combustion system 9, and the hot air in the auxiliary air pipeline 15 enters the ash combustion system 9 as hot auxiliary air to assist the ash combustion and make it burn more vigorously.
[0038] Optionally, both the ejection pipeline 14 and the auxiliary air pipeline 15 are provided with a hot air electric valve 13. The hot air electric valve 13 on the ejection pipeline 14 can control the on-off of the ejection pipeline 14, and the hot air electric valve 13 on the auxiliary air pipeline 15 can control the on-off of the auxiliary air pipeline 15.
[0039] Optionally, the ash bin 7 and the buffer bin 8 are connected via a second pipeline, and the second pipeline is provided with an ash bin 7 blanking valve. The ash bin 7 blanking valve can control the on-off of the second pipeline.
[0040] Optionally, the outlet of the buffer bin 8 is connected to the ejection pipeline 14 through a third pipeline, and the third pipeline is provided with a hopper blanking valve 17. The hopper blanking valve 17 can control the on-off of the third pipeline.
[0041] Optionally, the multi-stage drying gasification ash coupled coal-fired unit disposal system further includes a dust removal device 6, the inlet of the dust removal device 6 is connected to the hot air outlet of the heat exchanger 5, and the outlet of the dust removal device 6 is connected to the ash bin 7. After the small-particle ash enters the heat exchanger 5 for cooling, it enters the dust removal device 6, and enters the ash bin 7 after dust removal by the dust removal device 6.
[0042] Optionally, the drying system includes a primary drying device 1 and a secondary drying device 2, the primary drying device 1 is connected to the secondary drying device 2, and the secondary drying device 2 is connected to the adiabatic circulating fluidized bed 3. The drying system can dry high-moisture ash to reduce the moisture content of the ash from 50% to about 20%.
[0043] Optionally, the high-temperature flue gas outlet of the pulverized coal boiler 10 is connected to the drying system. The pulverized coal boiler 10 has a high-temperature flue gas intake port, through which the high-temperature flue gas returns to the primary drying device 1 and the secondary drying device 2, providing a heat source for the primary drying device 1 and the secondary drying device 2 to achieve drying of the ash.
[0044] When the multi-stage drying gasified ash coupled with the coal-fired unit consumption system is working, the wet ash enters the drying system from the wet ash inlet 18 of the primary drying device 1 for drying, and passes through the primary drying device 1 and the secondary drying device 2 to reduce the moisture content of the ash from 50% to about 20%. The dried gasified ash is mixed with coal powder in the adiabatic circulating fluidized bed 3 to be consumed for the first time, and the unburned ash enters the cyclone separator 4. The large particles of ash return to the adiabatic circulating fluidized bed 3 through the ash return pipe to continue burning. The small particles of ash enter the heat exchanger 5 with the high-temperature flue gas for cooling, and then enter the dust collector for dust removal, and then enter the ash bin 7. In order to ensure the continuity of feeding, a large amount of small particles of ash are stored in the buffer bin 8. The cold auxiliary air generated by the fan 11 is heated by the heat exchanger 5 and then divided into two paths. One path of hot air enters the ash combustion system 9 through the induced draft pipe 14. This path of hot air uses the high-speed induced effect to carry the small particles of ash falling from the buffer bin 8 into the ash combustion system 9. The other path of hot air enters the ash combustion system 9 through the auxiliary air pipe 15. This path of hot air enters the ash combustion system 9 as hot auxiliary air, making the ash burn more vigorously and burn out, so as to carry out the second disposal.
[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 multi-stage drying and gasification ash-slag coupled coal-fired unit disposal system, characterized in that: include: Drying system; an adiabatic circulating fluidized bed (3), wherein the adiabatic circulating fluidized bed (3) is connected to a drying system; A cyclone separator (4), wherein a feed port of the cyclone separator (4) is connected to a smoke outlet of the adiabatic circulating fluidized bed (3), and a solid outlet of the cyclone separator (4) is connected to a slag return port of the adiabatic circulating fluidized bed (3); A heat exchanger (5), a fan (11) and an ash bin (7), wherein the gas outlet of the cyclone separator (4) is connected to the hot air inlet of the heat exchanger (5), the hot air outlet of the heat exchanger (5) is connected to the ash bin (7), and the cold air inlet of the heat exchanger (5) is connected to the fan (11); An ash combustion system (9) and a pulverized coal boiler (10), wherein the cold air outlet of the heat exchanger (5) is connected to the ash combustion system (9), and the ash combustion system (9) is connected to the pulverized coal boiler (10).
2. The multi-stage drying gasification ash-slag coupled coal-fired unit disposal system according to claim 1 is characterized in that: The drying system comprises a primary drying device (1) and a secondary drying device (2), wherein the primary drying device (1) is connected to the secondary drying device (2), and the secondary drying device (2) is connected to an adiabatic circulating fluidized bed (3).
3. The multi-stage drying gasification ash-slag coupled coal-fired unit disposal system according to claim 1 is characterized in that: The high-temperature flue gas outlet of the pulverized coal boiler (10) is in communication with the drying system.
4. The multi-stage drying gasification ash-slag coupled coal-fired unit disposal system according to claim 1, characterized in that: It also includes a dust removal device (6), the inlet of the dust removal device (6) is connected to the hot air outlet of the heat exchanger (5), and the outlet of the dust removal device (6) is connected to the ash bin (7).
5. The multi-stage drying gasification ash-slag coupled coal-fired unit disposal system according to claim 1 is characterized in that: The fan (11) is connected to the heat exchanger (5) via a first pipeline, and the first pipeline is provided with a cold air electric valve (12).
6. The multi-stage drying gasification ash-slag coupled coal-fired unit disposal system according to claim 1, characterized in that: It also comprises a buffer bin (8), the inlet of which is in communication with the ash bin (7), and the outlet of which is in communication with the ash combustion system (9).
7. The multi-stage drying and gasification ash-slag coupled coal-fired unit disposal system according to claim 6 is characterized in that: The ash bin (7) and the buffer bin (8) are connected via a second pipeline, and the second pipeline is provided with an ash bin (7) discharge valve.
8. The multi-stage drying and gasification ash-slag coupled coal-fired unit disposal system according to claim 6, characterized in that: It also includes an ejector pipeline (14) and an auxiliary air pipeline (15), wherein the two ends of the ejector pipeline (14) are respectively connected to the hot air outlet of the heat exchanger (5) and the ash combustion system (9), the outlet of the buffer bin (8) is connected to the ejector pipeline (14), and the two ends of the auxiliary air pipeline (15) are respectively connected to the hot air outlet of the heat exchanger (5) and the ash combustion system (9).
9. The multi-stage drying and gasification ash-slag coupled coal-fired unit disposal system according to claim 8, characterized in that: The ejection pipeline (14) and the auxiliary air pipeline (15) are both provided with a hot air electric valve (13).
10. The multi-stage drying and gasification ash-slag coupled coal-fired unit disposal system according to claim 8, characterized in that: The outlet of the buffer bin (8) is connected to the ejection pipeline (14) via a third pipeline, and the third pipeline is provided with a hopper discharge valve (17).