Arrangement system for large and medium-sized dry quenching waste heat utilization

Abstract

The invention relates to an arrangement system for large and medium-sized dry quenching waste heat utilization, which is characterized in that a dry quenching furnace, a primary dust remover, a dry quenching waste heat boiler, a connecting flue, a secondary dust remover, a circulating fan and a water supply preheater are annularly arranged, the dry quenching waste heat boiler and a boiler water supply pump station system are arranged in a combined manner, the outlet of the dry quenching waste heat boiler is raised, and the outlet of the secondary dust remover is raised. A boiler water supply pump station system is arranged between the bottom of an outlet of the improved coke dry quenching waste heat boiler and the ground, a desalting water tank is arranged on the ground beside the boiler water supply pump station system, sampling equipment is arranged beside the outlet of the coke dry quenching waste heat boiler, and a deaerator is arranged beside the lower portion of the coke dry quenching waste heat boiler. The dry quenching waste heat boiler waste heat recycling system has the beneficial effects that the occupied area and building structure cost of a boiler water supply pump station system can be saved, the dry quenching waste heat boiler waste heat recycling structure is more compact, the occupied area is small, the building workload is saved, and the building cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of dry coke quenching waste heat utilization, and in particular to a layout system for utilizing waste heat from large and medium-sized dry coke quenching plants. Background Art

[0002] The main purpose of the CDQ waste heat recovery system is to recover and utilize energy. The method is to use the CDQ waste heat boiler to absorb the heat of the circulating gas to generate steam, and then use the steam to drive the steam turbine generator set to generate electricity and heat to recover the sensible heat of the red coke.

[0003] The CDQ waste heat boiler, boiler feed water pump station system and steam turbine power station in the CDQ waste heat recovery system are mostly independent buildings. The CDQ waste heat boiler, boiler feed water pump station system and steam turbine power station are arranged in sequence, and each unit is connected through the CDQ area pipeline corridor, occupying a large area.

[0004] In traditional CDQ waste heat recovery systems, the boiler outlet is connected to the secondary dust collector via a flue. While the furnace height of the CDQ waste heat boiler increases with the size of the CDQ unit, the flue outlet height of the CDQ waste heat boiler has remained constant at approximately 2.0m. The lower furnace of the CDQ waste heat boiler is hollow, with virtually no heating surface. The connecting flue is located almost close to the ground, making it impassable for vehicles and hindering maintenance. Furthermore, because the connecting flue at the CDQ waste heat boiler outlet must ascend a considerable distance before entering the secondary dust collector, a large amount of coke particles in the inert circulating gas are deposited in the connecting flue. Long-term operation increases system resistance, impacting production. Removing the coke particles from the connecting flue requires a production halt. Because the connecting flue is located close to the ground, an ash discharge valve cannot be installed, requiring manual cleaning, which is labor-intensive and inefficient. Summary of the Invention

[0005] In order to overcome the shortcomings of the existing technology, the present invention provides a layout system for the utilization of large and medium-sized dry coke quenching waste heat. Without changing the inlet elevation of the flue of the conventional dry coke quenching waste heat boiler, the flue outlet elevation of the dry coke quenching waste heat boiler is increased, and the dry coke quenching waste heat boiler and the boiler feed water pump station system are combined and arranged. The system occupies a small area, saves civil construction work, and reduces construction costs. The dry coke quenching waste heat utilization is compactly arranged, and the waste heat recovery efficiency is high. The bottom elevation of the flue connecting the dry coke quenching waste heat boiler and the secondary dust collector is increased, and an ash unloading valve is installed at the lower part of the connecting flue, which reduces the cleaning workload and improves the cleaning efficiency. The mechanized maintenance equipment can walk on the bottom of the dry coke quenching waste heat boiler, thereby improving the dry coke quenching waste heat recovery efficiency.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A layout system for utilizing waste heat from large and medium-sized dry coke quenching (CDQ) systems includes a CDQ furnace, a primary dust collector, a CDQ waste heat boiler, a connecting flue, a secondary dust collector, a circulating fan, a feed water preheater, a boiler feed water pump station system, a desalted water tank, a sampling device, a deaerator, and an ash discharge valve. The CDQ furnace, primary dust collector, CDQ waste heat boiler, connecting flue, secondary dust collector, circulating fan, and feed water preheater are arranged in a ring. The CDQ waste heat boiler and the boiler feed water pump station system are arranged in combination. The outlet of the CDQ waste heat boiler is elevated, and a boiler feed water pump station system is arranged between the bottom of the elevated CDQ waste heat boiler outlet and the ground. A desalted water tank is arranged on the ground next to the boiler feed water pump station system. A sampling device is arranged next to the outlet of the CDQ waste heat boiler, and a deaerator is arranged next to the lower part of the CDQ waste heat boiler.

[0008] Furthermore, the boiler feed water pump station system includes a boiler feed water pump, a deoxygenation feed water pump, an ammonia dosing device, a deoxidizer dosing device, a phosphate dosing device, a sample water recovery device, a continuous sewage expansion device, and a periodic sewage expansion device.

[0009] Furthermore, an ash discharge valve is provided at the lower portion of the flue connecting the dry quenching waste heat boiler and the secondary dust collector.

[0010] Furthermore, the sampling equipment is arranged on an auxiliary span 4.4m platform, and the sampling water of the sampling equipment flows into the sample water recovery equipment by gravity, and the sample water is sent to the desalted water tank after recovery.

[0011] Furthermore, the deaerator is arranged on an 8.8m building platform.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. By raising the flue outlet elevation of the CDQ waste heat boiler and utilizing the lower space of the CDQ waste heat boiler to arrange the equipment of the boiler feed water pump station system, the land occupation and building structure cost of the boiler feed water pump station system can be saved. The waste heat recovery and utilization structure of the CDQ waste heat boiler is more compact, occupies less area, saves construction workload and reduces construction costs.

[0014] 2. The boiler feed water pump station system is set at the bottom of the CDQ waste heat boiler, saving the connecting pipes and pipe corridors between the boiler feed water pump station system and the CDQ waste heat boiler. The boiler feed water pump station system and the CDQ waste heat boiler have a compact structure. The boiler feed water pump station system is set on the ground, which saves investment, is convenient and quick to maintain, and improves the utilization rate of the CDQ waste heat boiler.

[0015] 3. The outlet elevation of the CDQ waste heat boiler is increased, which saves the amount of flue connection between the CDQ waste heat boiler and the secondary dust collector, reduces the connection height, reduces the operating resistance of the circulating fan, improves the processing efficiency of the secondary dust collector, improves the processing effect of the dust collector, saves production costs, and improves the operating efficiency of the CDQ waste heat boiler.

[0016] 4. After the boiler flue outlet elevation is raised, the clearance at the bottom of the flue gas duct between the dry coke quenching waste heat boiler and the secondary dust collector is increased, which can be used for vehicle passage, making maintenance more convenient and increasing the degree of mechanization of maintenance.

[0017] 5. The flue connecting the CDQ waste heat boiler and the secondary dust collector becomes shorter after the outlet height of the CDQ waste heat boiler is increased, the coke powder deposition phenomenon will be alleviated, the pipeline cleaning volume will be reduced, and the connection reliability of the CDQ waste heat boiler and the secondary dust collector will be improved. At the same time, an ash unloading valve can be installed at the lower part of the flue to transport the deposited coke powder to the designated location by pneumatic conveying or scraper conveyor, reducing the cleaning workload and improving the cleaning efficiency. The maintenance machinery can be arranged at the bottom of the CDQ waste heat boiler for maintenance, saving maintenance distance, shortening maintenance time, and improving the mechanical level of CDQ waste heat recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a system layout diagram of a layout system for utilizing waste heat from large and medium-sized dry quenching coke reactors as described in the present invention.

[0019] Figure 2 This is the elevation and cross-section layout of the dry quenching waste heat boiler described in the present invention.

[0020] Figure 3 This is a ground equipment layout diagram of the CDQ waste heat utilization system described in the present invention.

[0021] Figure 4 This is the equipment layout diagram of the sampling equipment at an elevation of 4.4m described in the present invention.

[0022] Figure 5 This is the equipment layout diagram of the deaerator at an elevation of 8.8m described in the present invention.

[0023] Figure 6 It is a schematic elevational layout of the sampling equipment and deaerator according to the present invention.

[0024] Figure 7 This is a vertical layout diagram of a traditional dry coke quenching waste heat boiler according to the present invention.

[0025] In the figure: 1. CDQ furnace; 2. Primary dust collector; 3. CDQ waste heat boiler; 4. Connecting flue; 5. Secondary dust collector; 6. Circulating fan; 7. Feed water preheater; 8. Boiler feed water pump; 9. Deaerator feed water pump; 10. Ammonia dosing equipment; 11. Deoxidizer dosing equipment; 12. Phosphate dosing equipment; 13. Sample water recovery equipment; 14. Continuous sewage expansion tank; 15. Periodic sewage expansion tank; 16. Desalted water tank; 17. Sampling equipment; 18. Deaerator; 19. Ash discharge valve; 20. Auxiliary span 4.4m platform; 21. 8.8m construction platform. DETAILED DESCRIPTION

[0026] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0027] Example: Figure 7 As shown, taking a 200 t / h CDQ coke oven as an example, the conventional CDQ waste heat boiler 3 has a conventional outlet elevation of 1.8 m. There is actually no heating surface inside the lower furnace of the CDQ waste heat boiler 3. The bottom of the CDQ waste heat boiler 3 is a hollow structure, and the connecting flue 4 between the CDQ waste heat boiler 3 and the secondary dust collector 5 is arranged almost close to the ground.

[0028] like Figures 1-6 As shown, a layout system for utilizing the waste heat from large and medium-sized dry coke quenching boilers includes a dry quenching furnace 1, a primary dust collector 2, a dry coke quenching waste heat boiler 3, a connecting flue 4, a secondary dust collector 5, a circulating fan 6, a feed water preheater 7, a boiler feed water pump station system, a desalted water tank 16, a sampling device 17, a deaerator 18, and an ash discharge valve 19. The dry quenching furnace 1, the primary dust collector 2, the dry coke quenching waste heat boiler 3, the connecting flue 4, the secondary dust collector 5, the circulating fan 6, and the feed water preheater 7 are arranged in a ring. Without changing the heating surface in the dry coke quenching waste heat boiler 3, the elevation of the flue outlet of the dry coke quenching waste heat boiler 3 is increased to 7m, and the flue outlet lifting height is 5.2m. The dry coke quenching waste heat boiler 3 is arranged together with the boiler feed water pump station system. The elevation of the flue outlet of the dry coke quenching waste heat boiler 3 is increased. A boiler feed water pump station system is set on the ground at the bottom of the elevated CDQ waste heat boiler 3, and a sampling device 17 is set on a 4.4m auxiliary span platform 20 on the side of the CDQ waste heat boiler 3 flue outlet. Since the boiler feed water pump station system is set at the bottom of the CDQ waste heat boiler 3, only the 4.4m auxiliary span platform 20 is retained for placing the sampling device 17. A desalted water tank 16 is set on the ground beside the boiler feed water pump station system, and the desalted water tank 16 is set on the ground outside the boiler feed water pump station system. A deaerator 18 is placed on an 8.8m building platform 21 on the lower side of the CDQ waste heat boiler 3. This optimized layout scheme raises the flue outlet elevation of the CDQ waste heat boiler 3 and utilizes the space below the CDQ waste heat boiler 3 to arrange the equipment of the CDQ waste heat boiler feed water pump station system.

[0029] Furthermore, the boiler feed water pump station system includes a boiler feed water pump 8, a deoxygenation feed water pump 9, an ammonia dosing device 10, a deoxygenator dosing device 11, a phosphate dosing device 12, a sample water recovery device 13, a continuous sewage expansion device 14, and a periodic sewage expansion device 15. The boiler feed water pump 8, the deoxygenation feed water pump 9, the ammonia dosing device 10, the deoxygenator dosing device 11, the phosphate dosing device 12, the sample water recovery device 13, the continuous sewage expansion device 14, and the periodic sewage expansion device 15 are arranged on the ground at the bottom of the dry quenching waste heat boiler 3, and the connecting pipes and pipe corridors are shortened and compact.

[0030] Furthermore, an ash discharge valve 19 is provided at the lower portion of the connecting flue 4 connecting the elevated dry coke quenching waste heat boiler 3 and the secondary dust collector 5. The connecting flue 4 is elevated, and the coke ash in the ash discharge valve 19 can be cleaned manually, or the heavily coked ash discharged from the ash discharge valve can be transported by a pneumatic conveying device or a scraper, thereby improving the mechanization of the cleaning process.

[0031] Furthermore, the sampling device 17 is arranged on the auxiliary span 4.4m platform 20, and the sampling water of the sampling device 17 enters the sample water recovery device 13 by gravity, and the sample water is sent to the desalted water tank 16 after recovery. The sampling device 17 is connected to the desalted water tank 16 through the sample water recovery device 13. The sample water recovery device 13 is set on the ground at the bottom of the dry quenching waste heat boiler 3, and the sampling device 17 is set on the auxiliary span 4.4m platform 20. Through the height difference between the sampling device 17 and the sample water recovery device 13, the sample water flows into the sample water recovery device 13 by gravity, and the sample water is sent to the desalted water tank 16 after recovery.

[0032] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A layout system for utilizing waste heat from large and medium-sized dry coke quenching, comprising a dry coke quenching furnace, a primary dust collector, a dry coke quenching waste heat boiler, a connecting flue, a secondary dust collector, a circulating fan, a feed water preheater, a boiler feed water pump station system, a desalted water tank, a sampling device, a deaerator, and an ash discharge valve, characterized in that: The dry quenching furnace, primary dust collector, dry quenching waste heat boiler, connecting flue, secondary dust collector, circulating fan, and feed water preheater are arranged in a ring shape. The dry quenching waste heat boiler and the boiler feed water pump station system are arranged in combination. The dry quenching waste heat boiler outlet is raised, and a boiler feed water pump station system is arranged between the bottom of the raised dry quenching waste heat boiler outlet and the ground. A desalted water tank is arranged on the ground beside the boiler feed water pump station system. A sampling device is arranged beside the dry quenching waste heat boiler outlet, and a deaerator is arranged beside the lower part of the dry quenching waste heat boiler.

2. The arrangement system for utilizing waste heat from large and medium-sized CDQ plants according to claim 1 is characterized in that: The boiler feed water pump station system includes a boiler feed water pump, a deoxygenation feed water pump, an ammonia dosing device, a deoxidizer dosing device, a phosphate dosing device, a sample water recovery device, a continuous sewage expansion device, and a periodic sewage expansion device.

3. The arrangement system for utilizing waste heat from large and medium-sized CDQ plants according to claim 1 is characterized in that: An ash discharge valve is arranged at the lower part of the flue connecting the dry coke quenching waste heat boiler and the secondary dust collector.

4. The arrangement system for utilizing waste heat from large and medium-sized CDQ plants according to claim 1 is characterized in that: The sampling device is arranged on the auxiliary span 4.4m platform. The sampling water of the sampling device flows into the sample water recovery device by gravity. The sample water is recovered and sent to the desalted water tank.

5. The arrangement system for utilizing waste heat from large and medium-sized CDQ plants according to claim 1 is characterized in that: The deaerator is arranged on a 8.8m building platform.

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