A large and medium-sized dry quenching waste heat utilization arrangement system

Abstract

This invention relates to an arrangement system for the utilization of waste heat from dry quenching coke ovens in large and medium-sized applications. The dry quenching furnace, primary dust collector, dry quenching waste heat boiler, connecting flue, secondary dust collector, circulating fan, and feedwater preheater are arranged in a ring. The dry quenching waste heat boiler and the boiler feedwater pumping station system are combined. The outlet of the dry quenching waste heat boiler is raised. The boiler feedwater pumping station system is located between the bottom of the raised dry quenching waste heat boiler outlet and the ground. A demineralized water tank is located on the ground beside the boiler feedwater pumping station system. A sampling device is located beside the outlet of the dry quenching waste heat boiler. A deaerator is located beside the lower part of the dry quenching waste heat boiler. The advantages of this invention are: it saves on the land area and building structure costs of the boiler feedwater pumping station system; the waste heat recovery and utilization structure of the dry quenching waste heat boiler is more compact, occupies less space, saves construction work, and reduces construction costs.

Description

Technical Field

[0001] This invention relates to the field of waste heat utilization technology in dry quenching coke, and in particular to an arrangement system for waste heat utilization in large and medium-sized dry quenching coke. Background Technology

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

[0003] In a dry quenching waste heat recovery system, the dry quenching waste heat boiler, boiler feedwater pumping station system, and steam turbine power station are mostly independent buildings. The dry quenching waste heat boiler, boiler feedwater pumping station system, and steam turbine power station are arranged sequentially and connected to each unit through a pipe gallery in the dry quenching area, which occupies a large area.

[0004] In traditional dry quenching waste heat recovery systems, the boiler outlet and secondary dust collector are connected via a flue. While the furnace height of the dry quenching waste heat boiler increases with the size of the dry quenching unit, the flue outlet height remains consistently around 2.0m. The lower furnace of the dry quenching waste heat boiler is essentially hollow, lacking any heating surface, and the connecting flue is almost ground-level, preventing vehicle access and hindering maintenance. Furthermore, because the connecting flue requires a significant upward climb before entering the secondary dust collector, a large amount of coke powder particles from the inert circulating gas accumulates within the flue. Prolonged operation increases system resistance and impacts production. Removing coke powder from the connecting flue necessitates a production shutdown. Due to the ground-level location of the connecting flue, ash discharge valves cannot be installed, requiring manual cleaning, which is labor-intensive and inefficient. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention provides a layout system for the utilization of waste heat from dry quenching coke ovens in large and medium-sized plants. Without altering the inlet elevation of the conventional dry quenching coke oven waste heat boiler flue, the system increases the outlet elevation of the flue, merging the dry quenching coke oven waste heat boiler with the boiler feedwater pumping station system. This results in a smaller footprint, reduced civil engineering work, lower construction costs, a compact layout for waste heat utilization, and high waste heat recovery efficiency. Furthermore, by raising the bottom elevation of the connecting flue between the dry quenching coke oven waste heat boiler and the secondary dust collector, and installing an ash discharge valve at the bottom of the connecting flue, the system reduces ash cleaning workload and improves ash cleaning efficiency. Mechanized maintenance equipment can travel at the bottom of the dry quenching coke oven waste heat boiler, further enhancing the efficiency of waste heat recovery.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] An arrangement system for the utilization of waste heat from dry quenching coke ovens in large and medium-sized applications includes a dry quenching furnace, a primary dust collector, a dry quenching waste heat boiler, a connecting flue, a secondary dust collector, a circulating fan, a feedwater preheater, a boiler feedwater pumping station system, a demineralized water tank, sampling equipment, a deaerator, and an ash discharge valve. The dry quenching furnace, primary dust collector, dry quenching waste heat boiler, connecting flue, secondary dust collector, circulating fan, and feedwater preheater are arranged in a ring. The dry quenching waste heat boiler and the boiler feedwater pumping station system are combined. The outlet of the dry quenching waste heat boiler is raised. The boiler feedwater pumping station system is located between the bottom of the raised dry quenching waste heat boiler outlet and the ground. A demineralized water tank is located on the ground next to the boiler feedwater pumping station system. A sampling device is located next to the outlet of the dry quenching waste heat boiler. A deaerator is located next to the lower part of the dry quenching waste heat boiler.

[0008] Furthermore, the boiler feedwater pumping station system includes a boiler feedwater pump, a deaerator feedwater pump, ammonia dosing equipment, deaerator dosing equipment, phosphate dosing equipment, sample water recovery equipment, continuous blowdown expander, and periodic blowdown expander.

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

[0010] Furthermore, the sampling equipment is arranged on an auxiliary 4.4m platform. The sampled water from the sampling equipment flows by gravity into the sample water recovery equipment, and the recovered sample water is sent to the demineralized water tank.

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

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. By raising the flue outlet elevation of the dry quenching waste heat boiler, the space below the dry quenching waste heat boiler can be used to arrange the equipment of the boiler feedwater pump station system. This can save the land area and building structure cost of the boiler feedwater pump station system. The waste heat recovery and utilization structure of the dry quenching waste heat boiler is more compact, occupies less area, saves construction workload, and reduces construction costs.

[0014] 2. The boiler feedwater pump station system is located at the bottom of the dry quenching waste heat boiler, saving on the connecting pipes and pipe racks between the boiler feedwater pump station system and the dry quenching waste heat boiler. The boiler feedwater pump station system and the dry quenching waste heat boiler have a compact structure. The boiler feedwater pump station system is located on the ground, saving investment, making maintenance convenient and quick, and improving the utilization rate of the dry quenching waste heat boiler.

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

[0016] 4. After the boiler flue outlet elevation is raised, the lower clearance of the flue gas duct between the dry quenching waste heat boiler and the secondary dust collector is increased, which can be used for vehicle passage, facilitates maintenance, and increases the degree of mechanization of maintenance.

[0017] 5. Due to the increased outlet height of the dry quenching waste heat boiler, the connecting flue between the dry quenching waste heat boiler and the secondary dust collector is shortened, which reduces coke powder deposition and the amount of ash removal required. This improves the reliability of the connection between the dry quenching waste heat boiler and the secondary dust collector. Additionally, an ash discharge valve can be installed at the bottom of the flue to transport the deposited coke powder to a designated location using pneumatic conveying or a scraper conveyor, reducing the amount of ash removal work and improving ash removal efficiency. Maintenance equipment can be arranged at the bottom of the dry quenching waste heat boiler, saving maintenance distance, shortening maintenance time, and improving the mechanization of dry quenching waste heat recovery. Attached Figure Description

[0018] Figure 1 This is a system layout diagram of a layout system for the utilization of waste heat from dry quenching coke, as described in this invention.

[0019] Figure 2 This is the elevation cross-sectional layout diagram of the dry quenching waste heat boiler described in this invention.

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

[0021] Figure 4 This is a diagram showing the layout of the sampling device at an elevation of 4.4m as described in this invention.

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

[0023] Figure 6 This is an elevation layout diagram of the sampling equipment and deaerator described in this invention.

[0024] Figure 7 This is the elevation layout diagram of the traditional dry quenching waste heat boiler described in this invention.

[0025] In the diagram: 1. Dry quenching furnace; 2. Primary dust collector; 3. Dry quenching coke waste heat boiler; 4. Connecting flue; 5. Secondary dust collector; 6. Circulating fan; 7. Feedwater preheater; 8. Boiler feedwater pump; 9. Deaerator feedwater pump; 10. Ammonia dosing equipment; 11. Deoxygenant dosing equipment; 12. Phosphate dosing equipment; 13. Sample water recovery equipment; 14. Continuous blowdown expander; 15. Periodic blowdown expander; 16. Demineralized water tank; 17. Sampling equipment; 18. Deaerator; 19. Ash discharge valve; 20. Auxiliary 4.4m platform; 21. 8.8m building platform. Detailed Implementation

[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 200t / h dry quenching coke oven as an example, the conventional outlet elevation of the dry quenching waste heat boiler 3 is 1.8m. The interior of the lower furnace of the dry quenching waste heat boiler 3 actually has no heating surface. The bottom of the dry quenching waste heat boiler 3 has a hollow structure, and the connecting flue 4 between the dry quenching 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 waste heat from dry quenching coke ovens in large and medium-sized plants includes a dry quenching furnace 1, a primary dust collector 2, a dry quenching coke oven waste heat boiler 3, a connecting flue 4, a secondary dust collector 5, a circulating fan 6, a feedwater preheater 7, a boiler feedwater pumping station system, a demineralized water tank 16, a sampling device 17, a deaerator 18, and an ash discharge valve 19. The dry quenching furnace 1, primary dust collector 2, dry quenching coke oven waste heat boiler 3, connecting flue 4, secondary dust collector 5, circulating fan 6, and feedwater preheater 7 are arranged in a ring. Without changing the heating surface area inside the dry quenching coke oven waste heat boiler 3, the elevation of the flue outlet of the dry quenching coke oven waste heat boiler 3 is raised to 7m, with a flue outlet lifting height of 5.2m. The dry quenching coke oven waste heat boiler 3 is integrated with the boiler feedwater pumping station system. A boiler feedwater pump station system is installed on the ground at the bottom of the raised dry quenching waste heat boiler 3. The sampling device 17 is installed on the auxiliary span 4.4m platform 20 on the side of the flue outlet of the dry quenching waste heat boiler 3. Since the boiler feedwater pump station system is located at the bottom of the dry quenching waste heat boiler 3, only the auxiliary span 4.4m platform 20 is reserved for placing the sampling device 17. A demineralized water tank 16 is installed on the ground next to the boiler feedwater pump station system. The demineralized water tank 16 is located on the ground outside the boiler feedwater pump station system. A deaerator 18 is placed on the 8.8m building platform 21 on the lower side of the dry quenching waste heat boiler 3. This optimized layout scheme raises the flue outlet elevation of the dry quenching waste heat boiler 3 and utilizes the space under the dry quenching waste heat boiler 3 to arrange the equipment of the dry quenching waste heat boiler feedwater pump station system.

[0029] Furthermore, the boiler feedwater pump station system includes a boiler feedwater pump 8, a deaerator feedwater pump 9, ammonia dosing equipment 10, deaerator dosing equipment 11, phosphate dosing equipment 12, sample water recovery equipment 13, continuous blowdown expander 14, and periodic blowdown expander 15. The boiler feedwater pump 8, deaerator feedwater pump 9, ammonia dosing equipment 10, deaerator dosing equipment 11, phosphate dosing equipment 12, sample water recovery equipment 13, continuous blowdown expander 14, and periodic blowdown expander 15 are installed on the ground at the bottom of the dry quenching waste heat boiler 3, and the connecting pipes and pipe racks are shortened and compacted.

[0030] Furthermore, the lower part of the connecting flue 4 connecting the improved dry quenching waste heat boiler 3 and the secondary dust collector 5 is equipped with an ash discharge valve 19. The height of the connecting flue 4 is increased, and the coke ash in the ash discharge valve 19 can be manually cleaned, or the severe coke ash discharged by the ash discharge valve can be transported by a pneumatic conveying device or a scraper conveyor, thereby improving the mechanization of ash cleaning.

[0031] Furthermore, the sampling device 17 is arranged on the 4.4m platform 20 of the auxiliary span. The sampling water from the sampling device 17 flows by gravity into the sample water recovery device 13. After the sample water is recovered, it is sent to the demineralized water tank 16. The sampling device 17 is connected to the demineralized 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. The sampling device 17 is set on the 4.4m platform 20 of the auxiliary span. Due to the height difference between the sampling device 17 and the sample water recovery device 13, the sampling water flows by gravity into the sample water recovery device 13. After the sample water is recovered, it is sent to the demineralized water tank 16.

[0032] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A layout system for utilizing waste heat from dry quenching of coke ovens in large and medium-sized plants, comprising a dry quenching furnace, a primary dust collector, a dry quenching waste heat boiler, a connecting flue, a secondary dust collector, a circulating fan, a feedwater preheater, a boiler feedwater pumping station system, a demineralized water tank, sampling equipment, 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 feedwater preheater are arranged in a ring. The dry quenching waste heat boiler and the boiler feedwater pump station system are combined. The outlet of the dry quenching waste heat boiler is raised. The boiler feedwater pump station system is set between the bottom of the raised dry quenching waste heat boiler outlet and the ground. A demineralized water tank is set on the ground next to the boiler feedwater pump station system. A sampling device is set on the side of the outlet of the dry quenching waste heat boiler. A deaerator is set on the lower side of the dry quenching waste heat boiler.

2. The arrangement system for utilizing waste heat from dry quenching coke ovens according to claim 1, characterized in that, The boiler feedwater pump station system includes a boiler feedwater pump, a deaerator feedwater pump, ammonia dosing equipment, deaerator dosing equipment, phosphate dosing equipment, sample water recovery equipment, continuous blowdown expander, and periodic blowdown expander.

3. The arrangement system for utilizing waste heat from dry quenching coke ovens according to claim 1, characterized in that, An ash discharge valve is installed at the bottom of the connecting flue connecting the dry quenching waste heat boiler and the secondary dust collector.

4. The arrangement system for utilizing waste heat from dry quenching coke ovens according to claim 1, characterized in that, The sampling equipment is set on an auxiliary 4.4m platform. The sampled water from the sampling equipment flows by gravity into the sample water recovery equipment, and the recovered sample water is sent to the demineralized water tank.

5. The arrangement system for utilizing waste heat from dry quenching coke ovens according to claim 1, characterized in that, The deaerator is installed on an 8.8m building platform.

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