Full-dry quenching boiler power generation process system with electric heating heat compensation function and use method of full-dry quenching boiler power generation process system

Abstract

The invention relates to an electric heating heat compensation full dry quenching boiler power generation process system and a use method, and the system comprises a 1 # dry quenching furnace subsystem, a 2 # dry quenching furnace subsystem, a 1 # dry quenching boiler subsystem, a 2 # dry quenching boiler subsystem, a dry quenching boiler water supply subsystem and a dry quenching steam turbine power generation subsystem, each of the 1 # dry quenching boiler subsystem and the 2 # dry quenching boiler subsystem comprises a high-pressure high-power electric heating tube bundle, a heat compensation steam pocket, a secondary superheater, a primary superheater, a light tube evaporator, a fin evaporator, an economizer, a boiler main steam regulating valve and a boiler main water supply regulating valve; the high-pressure and high-power electric heating tube bundle is arranged on the heat supplementing steam pocket, and an output pipeline of the heat supplementing steam pocket is connected to the primary superheater, the light tube evaporator and the fin evaporator; according to the invention, the stable operation load range of the coke dry quenching boiler is improved by more than 10%, the problem of low-load operation of the full dry quenching system is solved, and the full dry quenching process system which is reliable in operation, efficient and environment-friendly is provided.

Description

Technical Field

[0001] The present invention relates to the technical field of power generation from waste heat from dry coke quenching, and in particular to a power generation process system for a full dry coke quenching boiler with electric heating and supplementary heat and a method for using the system. Background Art

[0002] Coke dry quenching refers to a method of quenching coke that uses inert gas as circulating gas to exchange heat with the hot red coke in the dry quenching furnace to cool it down. The heat absorbed by the circulating gas in the quenching process is exchanged through the dry quenching boiler to produce high-temperature and high-pressure steam, which is sent to the steam turbine power station through the pipeline corridor to generate electricity and realize waste heat utilization. Coke dry quenching technology can improve the quality of coke, avoid the pollution of wet quenching, and recover the sensible heat of red coke. With the increasing emphasis on energy conservation and environmental protection, most coking enterprises choose the full dry quenching solution for coke quenching, that is, they do not keep wet quenching as a standby, build multiple dry quenching units, provide sufficient equipment backup capacity, and ensure that when one dry quenching unit is under maintenance, other dry quenching units can bear the entire quenching load.

[0003] At present, the full dry quenching system mostly adopts three dry quenching coke units, and some enterprises also adopt two dry quenching coke units to form a full dry quenching system. Take a coking plant with a coke processing capacity of 200t / h as an example. Dry quenching coke composed of three dry quenching coke units: Under normal circumstances, each dry quenching coke unit operates at 67t / h; when a dry quenching coke unit is under maintenance, each dry quenching coke unit operates at 100t / h; during normal operation (67t / h) is 67% of the maximum operating load (100t / h). Dry quenching coke composed of two dry quenching coke units: Under normal circumstances, each dry quenching coke unit operates at 100t / h; when a dry quenching coke unit is under maintenance, each dry quenching coke unit operates at 200t / h; during normal operation (100t / h) is 50% of the maximum operating load (200t / h).

[0004] It can be seen that in the full dry quenching system composed of two dry quenching units, the normal operating load of a single dry quenching unit is 50% of the maximum operating load. When the quenching load fluctuates, it may drop to the range of 40% to 50%, which is not good for the steam-water cycle of the dry quenching boiler, causing the steam-water cycle to deteriorate and unable to ensure the stability of steam parameters, thereby affecting the safe operation of the steam turbine generator set. In the full dry quenching system composed of three dry quenching units, the normal operating load of a single dry quenching unit is 67% of the maximum operating load, which can meet the requirements of load fluctuations, but due to the increase in equipment sets, the initial investment ratio is greatly increased, so the technical and economic advantages are relatively low.

[0005] In the prior art, some coke dry quenching devices are designed with a supplementary combustion technology for the coke dry quenching system. In this technology, fuels such as gas are burned and sent into the coke dry quenching boiler to supplement the flue gas load, so that the load of the coke dry quenching boiler meets the equipment operation requirements, thereby ensuring the steam parameters and improving the power generation efficiency. However, adding a supplementary combustion device requires adding fuel storage and transportation equipment, combustion equipment, flue gas export equipment, treatment equipment, etc. At the same time, it breaks the system tightness of the circulating gas in the coke dry quenching system, adding a flue gas emission point to the coke dry quenching technology that was originally designed to solve the emission problem. In addition, for most coking enterprises, coke oven gas is an important chemical raw material or product, and they do not want to simply burn it to increase power generation. Moreover, in regions with abundant power sources, the value of chemical products is much greater than that of electric energy for enterprises.

[0006] Therefore, it is necessary to find a safe, feasible, highly efficient technical solution that does not increase the sewage discharge points and does not add many devices to achieve the safe, stable and reliable operation of the full coke dry quenching system composed of two coke dry quenching devices. Summary of the Invention

[0007] The present invention provides an electric heating supplementary heat full coke dry quenching boiler power generation process system and its usage method. In this system, the coke dry quenching boiler adopts an electric heating supplementary heat technology, which increases the stable operation load range of the coke dry quenching boiler by more than 10%, solves the problem of low-load operation of the full coke dry quenching system, and provides a full coke dry quenching process system with reliable operation, high efficiency and environmental protection.

[0008] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0009] An electric heating supplementary heat full coke dry quenching boiler power generation process system includes a No. 1 coke dry quenching subsystem, a No. 2 coke dry quenching subsystem, a No. 1 coke dry quenching boiler subsystem, a No. 2 coke dry quenching boiler subsystem, a coke dry quenching boiler feed water subsystem and a coke dry quenching steam turbine power generation subsystem. The No. 1 coke dry quenching subsystem is connected to the No. 1 coke dry quenching boiler subsystem, the No. 2 coke dry quenching subsystem is connected to the No. 2 coke dry quenching boiler subsystem. The output pipelines of the No. 1 coke dry quenching boiler subsystem and the No. 2 coke dry quenching boiler subsystem are connected to the coke dry quenching steam turbine power generation subsystem. The output pipeline of the coke dry quenching steam turbine power generation subsystem is connected to the coke dry quenching boiler feed water subsystem. The output pipeline of the coke dry quenching boiler feed water subsystem is connected to the input pipelines of the No. 1 coke dry quenching boiler subsystem and the No. 2 coke dry quenching boiler subsystem;

[0010] The 1# coke dry quenching boiler subsystem and the 2# coke dry quenching boiler subsystem both include high-voltage high-power electric heating tube bundles, supplementary heat steam drums, secondary superheaters, primary superheaters, plain tube evaporators, finned tube evaporators, economizers, boiler main steam regulating valves, and boiler main feed water regulating valves; the high-voltage high-power electric heating tube bundles are arranged on the supplementary heat steam drums, the output pipelines of the supplementary heat steam drums are respectively connected to the primary superheaters, plain tube evaporators, and finned tube evaporators, the output pipelines of the plain tube evaporators and finned tube evaporators are connected to the input pipeline of the supplementary heat steam drums, the output pipeline of the primary superheater is connected to the input pipeline of the secondary superheater, the output pipeline of the secondary superheater is connected to the coke dry quenching steam turbine generator subsystem through the boiler main steam regulating valve, and the input pipeline of the economizer is connected to the coke dry quenching boiler feed water subsystem through the boiler main feed water regulating valve.

[0011] Furthermore, the 1# coke dry quenching subsystem and the 2# coke dry quenching subsystem both include coke dry quenching furnaces, primary dust collectors, secondary dust collectors, circulation fans, and radial heat pipe type feed water preheaters. The output pipeline of the coke dry quenching furnace is connected to the input pipeline of the primary dust collector. The output pipeline of the primary dust collector of the 1# coke dry quenching subsystem is connected to the 1# coke dry quenching boiler subsystem. The output pipeline of the primary dust collector of the 2# coke dry quenching subsystem is connected to the 2# coke dry quenching boiler subsystem. The output pipeline of the 1# coke dry quenching boiler subsystem is connected to the input pipeline of the secondary dust collector of the 1# coke dry quenching subsystem. The output pipeline of the 2# coke dry quenching boiler subsystem is connected to the input pipeline of the secondary dust collector of the 2# coke dry quenching subsystem. The output pipeline of the secondary dust collector is connected to the circulation fan, the circulation fan is connected to the radial heat pipe type feed water preheater, and the output pipeline of the radial heat pipe type feed water preheater is respectively connected to the coke dry quenching furnace and the coke dry quenching boiler feed water subsystem.

[0012] Furthermore, the coke dry quenching steam turbine generator subsystem includes an air-cooled condenser, a condensate pump, a steam turbine, and a generator. The input pipeline of the steam turbine is connected to the 1# coke dry quenching boiler subsystem and the 2# coke dry quenching boiler subsystem. The steam turbine is connected to the generator and the air-cooled condenser. The air-cooled condenser is connected to the condensate pump. The output pipeline of the condensate pump is connected to the coke dry quenching boiler feed water subsystem. The output pipeline of the steam turbine is connected to the coke dry quenching boiler feed water subsystem.

[0013] Further, the dry quenching coke boiler feed water subsystem includes a demineralized water tank, a boiler feed water pump, a deaerating feed water pump, and a deaerator. The input pipeline of the deaerator is connected to the dry quenching coke steam turbine power generation subsystem, and the output pipeline of the deaerator is connected to the filtration feed water pump. The boiler feed water pump is respectively connected to the 1# dry quenching coke boiler subsystem and the 2# dry quenching coke boiler subsystem. The input pipeline of the demineralized water tank is connected to the dry quenching coke steam turbine power generation subsystem, and the output pipeline of the demineralized water tank is connected to the deaerating feed water pump. The output pipeline of the deaerating feed water pump is connected to the 1# dry quenching coke boiler subsystem and the 2# dry quenching coke boiler subsystem.

[0014] Further, the heat supplementary steam drum includes a steam drum shell, an intelligent control box, and a support. The support is arranged at the bottom of the steam drum shell, and the intelligent control box is connected to the corresponding signal lines of the measuring instruments of the heat supplementary steam drum and the signal lines of the high-voltage high-power electric heating tube bundles.

[0015] Further, the number of the high-voltage high-power electric heating tube bundles is 6 to 12 sets, and the high-voltage high-power electric heating tube bundles are powered by 10 kV with a power of 750 to 1500 kW.

[0016] A usage method of a fully dry quenching boiler power generation process system applying electric heating for heat supplement. When the 1# dry quenching furnace subsystem and the 2# dry quenching furnace subsystem are operating normally, if the coke oven load fluctuates at this time and the operating load of a single dry quenching furnace subsystem is less than 50% of its design capacity, the high-voltage high-power electric heating tube bundles on a single heat supplementary steam drum are turned on for heat supplement. The power of the operation of the electric heating tube bundles is adjusted according to the deviation amount between the boiler main steam outlet pressure and temperature of the 1# dry quenching coke boiler subsystem and the 2# dry quenching coke boiler subsystem and the normal value, so as to expand the operating range of the dry quenching coke device to about 35% - 100% of the design capacity.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] The application of high-power high-voltage heating tube bundles embedded in the steam drum to form a heat supplementary steam drum realizes the function of continuously supplementing heat for the dry quenching coke boiler by using electric energy, expands the operating load range of the dry quenching coke boiler, ensures the stable operation of two dry quenching coke devices simultaneously under a lower load, and the steam parameters meet the requirements. At the same time, the application of the electric heat supplementary steam drum avoids the problems of adding complex equipment for combustion heat supplement, environmental pollution, and flue gas treatment. The application of the intelligent control cabinet realizes intelligent heat supplement, ensuring energy-saving, continuous and adjustable heat supplement process. The electric energy used for heat supplement can be supplied by the electric energy generated by the steam turbine in the dry quenching coke steam turbine power generation subsystem without additional input of electric energy. Description of the Drawings

[0019] Figure 1 is the structural schematic diagram of the present invention.

[0020] Figure 2 is the structural schematic diagram of the heat supplementary steam drum of the present invention.

[0021] In the figure: 1. Coke dry quenching chamber; 2. Primary deduster; 3. High-voltage high-power electric heating tube bundle; 4. Heat supplement steam drum; 5. Secondary superheater; 6. Primary superheater; 7. Plain tube evaporator; 8. Finned tube evaporator; 9. Economizer; 10. Secondary deduster; 11. Circulation fan; 12. Radial heat pipe type feed water preheater; 13. Main steam regulating valve of boiler; 14. Main feed water regulating valve of boiler; 15. Demineralized water tank; 16. Boiler feed water pump; 17. Deaerating feed water pump; 18. Deaerator; 19. Air-cooled condenser; 20. Condensate pump; 21. Steam turbine; 22. Generator; 23. Steam drum shell; 24. Intelligent control box; 25. Support Specific implementation manners

[0022] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings:

[0023] See Figure 1 , which is a schematic structural diagram of the present invention. A full dry quenching boiler power generation process system with electric heating heat supplement of the present invention includes a 1# coke dry quenching furnace subsystem, a 2# coke dry quenching furnace subsystem, a 1# coke dry quenching boiler subsystem, a 2# coke dry quenching boiler subsystem, a coke dry quenching boiler feed water subsystem and a coke dry quenching steam turbine power generation subsystem. The 1# coke dry quenching furnace subsystem is connected to the 1# coke dry quenching boiler subsystem, the 2# coke dry quenching furnace subsystem is connected to the 2# coke dry quenching boiler subsystem, the output pipelines of the 1# coke dry quenching boiler subsystem and the 2# coke dry quenching boiler subsystem are connected to the coke dry quenching steam turbine power generation subsystem, the output pipeline of the coke dry quenching steam turbine power generation subsystem is connected to the coke dry quenching boiler feed water subsystem, and the output pipeline of the coke dry quenching boiler feed water subsystem is connected to the input pipelines of the 1# coke dry quenching boiler subsystem and the 2# coke dry quenching boiler subsystem;

[0024] Both the 1# coke dry quenching boiler subsystem and the 2# coke dry quenching boiler subsystem include a high-voltage high-power electric heating tube bundle 3, a heat supplement steam drum 4, a secondary superheater 5, a primary superheater 6, a plain tube evaporator 7, a finned tube evaporator 8, an economizer 9, a main steam regulating valve 13 of the boiler and a main feed water regulating valve 14 of the boiler. The high-voltage high-power electric heating tube bundle 3 is arranged on the heat supplement steam drum 4. The output pipelines of the heat supplement steam drum 4 are respectively connected to the primary superheater 6, the plain tube evaporator 7 and the finned tube evaporator 8. The output pipelines of the plain tube evaporator 7 and the finned tube evaporator 8 are connected to the input pipeline of the heat supplement steam drum 4. The output pipeline of the primary superheater 6 is connected to the input pipeline of the secondary superheater 5. The output pipeline of the secondary superheater 5 is connected to the coke dry quenching steam turbine power generation subsystem through the main steam regulating valve 13 of the boiler. The input pipeline of the economizer 9 is connected to the coke dry quenching boiler feed water subsystem through the main feed water regulating valve 14 of the boiler. There are 8 sets of the high-voltage high-power electric heating tube bundle 3, and the high-voltage high-power electric heating tube bundle 3 is powered by 10 kV with a power of 1000 kW.

[0025] The described No. 1 coke dry quenching furnace system and No. 2 coke dry quenching furnace system form a complete coke dry quenching system, which are used as partial backups for each other. When both are operating normally, each coke dry quenching furnace operates at 50% of its designed capacity. The red-hot coke from the coke oven enters No. 1 coke dry quenching furnace 1 and No. 2 coke dry quenching furnace 1 respectively. Each coke dry quenching furnace 1 undertakes 50% of the red-hot coke load. After the low-temperature inert gas at about 165 °C enters the coke dry quenching furnace 1 to cool the red-hot coke, its temperature rises to about 960 °C. After passing through the primary dust collector 2, the high-temperature inert gas enters the coke dry quenching boiler and exchanges heat with the secondary superheater 5, primary superheater 6, plain tube evaporator 7, finned evaporator 8, and economizer 9 inside the boiler in sequence. The temperature of the circulating gas itself decreases, and at the same time, high-temperature and high-pressure steam is generated. The low-temperature inert gas is discharged from the boiler outlet, enters the circulating fan 11 through the secondary dust collector 10, and after being pressurized, returns to the coke dry quenching furnace 1 through the radial heat pipe type feed water preheater 12.

[0026] When one of the two described coke dry quenching furnace systems is under maintenance, the other operates at its designed capacity, and all the red-hot coke from the coke oven enters one coke dry quenching furnace system.

[0027] Both the No. 1 coke dry quenching furnace system and the No. 2 coke dry quenching furnace system include a coke dry quenching furnace 1, a primary dust collector 2, a secondary dust collector 10, a circulating fan 11, and a radial heat pipe type feed water preheater 12. The output pipeline of the coke dry quenching furnace 1 is connected to the input pipeline of the primary dust collector 2. The output pipeline of the primary dust collector 2 of the No. 1 coke dry quenching furnace system is connected to the No. 1 coke dry quenching boiler system. The output pipeline of the primary dust collector 2 of the No. 2 coke dry quenching furnace system is connected to the No. 2 coke dry quenching boiler system. The output pipeline of the No. 1 coke dry quenching boiler system is connected to the input pipeline of the secondary dust collector 10 of the No. 1 coke dry quenching furnace system. The output pipeline of the No. 2 coke dry quenching boiler system is connected to the input pipeline of the secondary dust collector 10 of the No. 2 coke dry quenching furnace system. The output pipeline of the secondary dust collector 10 is connected to the circulating fan 11. The circulating fan 11 is connected to the radial heat pipe type feed water preheater 12. The output pipelines of the radial heat pipe type feed water preheater 12 are respectively connected to the coke dry quenching furnace 1 and the feed water subsystem of the coke dry quenching boiler.

[0028] The coke dry quenching steam turbine subsystem includes an air-cooled condenser 19, a condensate pump 20, a steam turbine 21, and a generator 22. The input pipeline of the steam turbine 21 is connected to the No. 1 coke dry quenching boiler system and the No. 2 coke dry quenching boiler system. The steam turbine 21 is connected to the generator 22 and the air-cooled condenser 19. The air-cooled condenser 19 is connected to the condensate pump 20. The output pipeline of the condensate pump 20 is connected to the feed water subsystem of the coke dry quenching boiler. The output pipeline of the steam turbine 21 is connected to the feed water subsystem of the coke dry quenching boiler.

[0029] The dry quenching coke boiler feed water subsystem includes a demineralized water tank 15, a boiler feed water pump 16, a deaerating feed water pump 17, and a deaerator 18. The input pipeline of the deaerator 18 is connected to the dry quenching coke steam turbine subsystem, and the output pipeline of the deaerator 18 is connected to a filtered feed water pump. The boiler feed water pump 16 is respectively connected to the 1# dry quenching coke boiler subsystem and the 2# dry quenching coke boiler subsystem. The input pipeline of the demineralized water tank 15 is connected to the dry quenching coke steam turbine subsystem, the output pipeline of the demineralized water tank 15 is connected to the deaerating feed water pump 17, and the output pipeline of the deaerating feed water pump 17 is connected to the 1# dry quenching coke boiler subsystem and the 2# dry quenching coke boiler subsystem.

[0030] See Figure 2 , the heat supplement steam drum 4 includes a steam drum housing 23, an intelligent control box 24, and a support 25. The support 25 is arranged at the bottom of the steam drum housing 23. The intelligent control box 24 is connected to the corresponding signal lines of the measuring instruments of the heat supplement steam drum 4 and the signal lines of the high-voltage high-power electric heating tube bundles 3. 8 sets of high-voltage high-power electric heating tube bundles 3 are embedded on the steam drum housing 23, which is powered by 10 kV, and the power of each group of electric heating tube bundles is 1000 kW. The power of each group of power electric heating tube bundles is adjusted through the intelligent control box 24. The electric heating tube bundles are equipped with high-voltage mating flanges and assembled to the steam drum, which is convenient for maintenance and disassembly and also avoids high-voltage leakage. The 8 groups of high-voltage high-power electric heating tube bundles 3 are evenly distributed on both sides below the steam drum, effectively heating the water space of the steam drum.

[0031] A usage method of a fully dry quenching boiler power generation process system using electric heating for heat supplement. When both of the 2 furnace subsystems are operating normally, if the coke oven load fluctuates at this time and the coke output of the coke oven is relatively low, the operating load of a single dry quenching coke may be less than 50% of its design capacity. At this time, to avoid the deterioration of the steam-water circulation in the dry quenching coke boiler and the inability to guarantee the steam parameters, the high-voltage high-power electric heating tube bundles 3 on a single heat supplement steam drum 4 are turned on for heat supplement. The power of the electric heating tube bundles in operation is adjusted according to the deviation between the main steam outlet pressure and temperature of the dry quenching coke boiler and the normal value, reducing the waste of electric energy while meeting the steam parameter requirements, and expanding the operating range of the dry quenching coke device to about 35% - 100% of the design capacity.

[0032] The electric energy used for heat supplement by the high-voltage high-power electric heating tube bundles 3 can be supplied by the electric energy output by the steam turbine 21 in the dry quenching coke steam turbine subsystem, without additional input of electric energy.

[0033] When the two furnace systems mentioned above are operating normally, the regulating valves on the main steam pipelines of the two coke dry quenching boilers regulate the pressure to ensure that the operating pressure parameters of the coke dry quenching boilers are maintained at normal values. The main steam of the two coke dry quenching boilers is merged into a common header and sent to the steam turbine 21 of the coke dry quenching steam turbine generating unit. The steam turbine 21 performs work to generate electricity. The exhaust steam after power generation is condensed into condensate through the air-cooled condenser 19, and is sent to the feed water subsystem of the coke dry quenching boiler through the condensate pump 20. It is heated through the radial heat pipe type feed water preheater 12 and deaerated through the deaerator 18 by the deaerating water pump, and finally sent to the two coke dry quenching boilers through the boiler feed water pump 16. The main feed water regulating valve in the coke dry quenching boiler system adjusts the water supply flow according to the drum level to ensure the stability of the level in the drum, which enables the system to operate safely and reliably.

[0034] By adopting the means of electric heating for heat compensation, the load range for the stable operation of each coke dry quenching boiler is increased, thereby reducing the number of coke dry quenching devices in the entire coke dry quenching system and reducing the equipment investment cost. The lower limit of the load for the stable operation of the coke dry quenching boiler is reduced from 50% to about 35%, enabling the entire coke dry quenching system composed of two coke dry quenching devices to resist conventional load fluctuations and making the system operation more reliable. The heat compensation drum 4 of the coke dry quenching boiler is applied. Eight sets of high-pressure high-power electric heating tube bundles 3 are embedded in the drum shell 23, and the power of each set of electric heating tube bundles is 1000 kW. The power of each set of electric heating tube bundles can be adjusted through the intelligent control cabinet to ensure the stable and reliable operation of the heat compensation device. The heat compensation power of the heat compensation drum 4 is supplied by the coke dry quenching steam turbine power station without additional power input, that is, the power generated by the system itself meets the heat compensation power.

[0035] The following embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operation processes are given. However, the protection scope of the present invention is not limited to the following embodiments. The methods used in the following embodiments are all conventional methods unless otherwise specified.

[0036]

Embodiment

[0037] See Figure 1 , which is the structural schematic diagram of the present invention. An electric heating heat compensation full coke dry quenching boiler power generation process system of the present invention includes a No. 1 coke dry quenching furnace system, a No. 2 coke dry quenching furnace system, a No. 1 coke dry quenching boiler system, a No. 2 coke dry quenching boiler system, a coke dry quenching boiler feed water system, and a coke dry quenching steam turbine generating subsystem. The No. 1 coke dry quenching furnace system is connected to the No. 1 coke dry quenching boiler system, the No. 2 coke dry quenching furnace system is connected to the No. 2 coke dry quenching boiler system, the output pipelines of the No. 1 coke dry quenching boiler system and the No. 2 coke dry quenching boiler system are connected to the coke dry quenching steam turbine generating subsystem, the output pipeline of the coke dry quenching steam turbine generating subsystem is connected to the coke dry quenching boiler feed water system, and the output pipeline of the coke dry quenching boiler feed water system is connected to the input pipelines of the No. 1 coke dry quenching boiler system and the No. 2 coke dry quenching boiler system;

[0038] The 1# coke dry quenching boiler subsystem and the 2# coke dry quenching boiler subsystem both include a high-voltage high-power electric heating tube bundle 3, a supplementary heat steam drum 4, a secondary superheater 5, a primary superheater 6, a plain tube evaporator 7, a finned evaporator 8, an economizer 9, a main steam regulating valve 13 of the boiler, and a main feed water regulating valve 14 of the boiler; the high-voltage high-power electric heating tube bundle 3 is arranged on the supplementary heat steam drum 4, the output pipelines of the supplementary heat steam drum 4 are respectively connected to the primary superheater 6, the plain tube evaporator 7, and the finned evaporator 8, the output pipelines of the plain tube evaporator 7 and the finned evaporator 8 are connected to the input pipeline of the supplementary heat steam drum 4, the output pipeline of the primary superheater 6 is connected to the input pipeline of the secondary superheater 5, the output pipeline of the secondary superheater 5 is connected to the coke dry quenching steam turbine subsystem through the main steam regulating valve 13 of the boiler, and the input pipeline of the economizer 9 is connected to the coke dry quenching boiler feed water subsystem through the main feed water regulating valve 14 of the boiler; there are 8 sets of the high-voltage high-power electric heating tube bundle 3, the high-voltage high-power electric heating tube bundle 3 is powered by 10 kV and has a power of 1000 kW.

[0039] Taking the typical full coke dry quenching condition as an example, two coke dry quenching subsystem are set, the total coke quenching capacity of the two coke dry quenching subsystems is designed to be at most 220 t / h, the inlet circulating gas flow rate of the coke dry quenching boiler is 314600 Nm 3 / h, the calculated inlet temperature of the coke dry quenching boiler is taken as 960 °C, the outlet temperature is taken as 165 °C, considering a 2% heat loss, through calculation, the total heat exchange load of the coke dry quenching subsystem is 376325875 kJ / h = 104534 kW, the steam production parameters are 9.81 MPa and 540 °C, the maximum designed steam flow rate of the two coke dry quenching boilers is designed according to the maximum load, and the steam production capacity is 122 t / h.

[0040] During normal operation of the system, the red hot coke enters the two coke dry quenching subsystems respectively. The heat exchange load between the circulating gas and the boiler of each coke dry quenching subsystem is 52267 kW, and the steam flow rate is 61 t / h. When one coke dry quenching subsystem is under maintenance, all the red hot coke enters one coke dry quenching subsystem, and the heat exchange load between its circulating gas and the boiler is 104534 kW, and the steam flow rate is 122 t / h.

[0041] When two coke dry quenching furnace systems in the system are operating, but the overall load tends to be in a lower operating condition, the intelligent control box 24 turns on the high-pressure high-power electric heating tube bundle 3 on the heat compensation steam drum 4 according to the decrease in the main steam outlet pressure of the boiler. The overall power of the heating tube bundle is adjustable, and the heat compensation power is intelligently regulated. For example, when the total coke dry quenching capacity of the coke oven drops to 200 t / h, the total heat exchange load of the two coke dry quenching devices drops to 342,114,432 kJ / h = 95,032 kW, and the total heat exchange load is reduced by 9,532 kW compared with the designed heat exchange load. At this time, the operating load of each coke dry quenching boiler is 47,516 kW, which does not reach 50% of the designed load, and the main steam outlet parameters cannot be guaranteed. At this time, it is necessary to use the high-pressure high-power electric heating tube bundle 3 on the heat compensation steam drum 4 for heat compensation. The heat compensation power is 52,267 - 47,516 = 4,751 kW, which can ensure the normal operation of the coke dry quenching boiler and ensure that the main steam parameters meet the basic requirements.

Claims

1. A full dry quenching boiler power generation process system with electric heating supplementary heat, comprising a 1# dry quenching furnace system, a 2# dry quenching furnace system, a 1# dry quenching coke boiler subsystem, a 2# dry quenching coke boiler subsystem, a dry quenching coke boiler feed water subsystem and a dry quenching coke steam turbine generator subsystem, wherein the 1# dry quenching furnace system is connected to the 1# dry quenching coke boiler subsystem, the 2# dry quenching furnace system is connected to the 2# dry quenching coke boiler subsystem, the output pipes of the 1# dry quenching coke boiler subsystem and the 2# dry quenching coke boiler subsystem are connected to the dry quenching coke steam turbine generator subsystem, the output pipe of the dry quenching coke steam turbine generator subsystem is connected to the dry quenching coke boiler feed water subsystem, and the output pipe of the dry quenching coke boiler feed water subsystem is connected to the input pipes of the 1# dry quenching coke boiler subsystem and the 2# dry quenching coke boiler subsystem; It is characterized in that The 1# dry coke quenching boiler subsystem and the 2# dry coke quenching boiler subsystem both include a high-pressure and high-power electric heating tube bundle, a supplementary heat drum, a secondary superheater, a primary superheater, a bare tube evaporator, a fin evaporator, an economizer, a boiler main steam regulating valve and a boiler main feed water regulating valve; the high-pressure and high-power electric heating tube bundle is arranged on the supplementary heat drum, the output pipe of the supplementary heat drum is respectively connected to the primary superheater, the bare tube evaporator and the fin evaporator, the output pipes of the bare tube evaporator and the fin evaporator are connected to the input pipe of the supplementary heat drum, the output pipe of the primary superheater is connected to the input pipe of the secondary superheater, the output pipe of the secondary superheater is connected to the dry coke quenching steam turbine generator subsystem through the boiler main steam regulating valve, and the input pipe of the economizer is connected to the dry coke quenching boiler feed water subsystem through the boiler main feed water regulating valve.

2. The electric heating supplementary heat full dry quenching boiler power generation process system according to claim 1 is characterized in that: The 1# dry quenching furnace system and the 2# dry quenching furnace system both include a dry quenching furnace, a primary dust collector, a secondary dust collector, a circulating fan and a radial heat pipe feed water preheater. The output pipe of the dry quenching furnace is connected to the input pipe of the primary dust collector, the output pipe of the primary dust collector of the 1# dry quenching furnace system is connected to the 1# dry quenching boiler subsystem, the output pipe of the primary dust collector of the 2# dry quenching furnace system is connected to the 2# dry quenching boiler subsystem, the output pipe of the 1# dry quenching boiler subsystem is connected to the secondary dust collector input pipe of the 1# dry quenching furnace system, the output pipe of the 2# dry quenching boiler subsystem is connected to the secondary dust collector input pipe of the 2# dry quenching furnace system, the output pipe of the secondary dust collector is connected to the circulating fan, the circulating fan is connected to the radial heat pipe feed water preheater, and the output pipes of the radial heat pipe feed water preheater are respectively connected to the dry quenching furnace and the dry quenching boiler feed water subsystem.

3. The electric heating supplementary heat full dry quenching boiler power generation process system according to claim 1 is characterized in that: The dry coke quenching steam turbine generator subsystem includes an air-cooled condenser, a condensate pump, a steam turbine and a generator. The steam turbine input pipeline is connected to the 1# dry coke quenching boiler subsystem and the 2# dry coke quenching boiler subsystem. The steam turbine is connected to the generator and the air-cooled condenser. The air-cooled condenser is connected to the condensate pump. The condensate pump output pipeline is connected to the dry coke quenching boiler feed water subsystem. The output pipeline of the steam turbine is connected to the dry coke quenching boiler feed water subsystem.

4. The electric heating supplementary heat full dry quenching boiler power generation process system according to claim 1 is characterized in that: The dry coke quenching boiler feed water subsystem includes a desalted water tank, a boiler feed water pump, a deoxygenated feed water pump and a deaerator. The input pipe of the deaerator is connected to the dry coke quenching steam turbine generator subsystem, the output pipe of the deaerator is connected to the filtered feed water pump, the boiler feed water pump is respectively connected to the 1# dry coke quenching boiler subsystem and the 2# dry coke quenching boiler subsystem, the input pipe of the desalted water tank is connected to the dry coke quenching steam turbine generator subsystem, the output pipe of the desalted water tank is connected to the deoxygenated feed water pump, and the output pipe of the deoxygenated feed water pump is connected to the 1# dry coke quenching boiler subsystem and the 2# dry coke quenching boiler subsystem.

5. The electric heating supplementary heat full dry quenching boiler power generation process system according to claim 1 is characterized in that: The supplementary heat drum comprises a drum shell, an intelligent control box and a support, wherein the support is arranged at the bottom of the drum shell, and the intelligent control box is connected to the corresponding signal line of the measuring instrument of the supplementary heat drum and the signal line of the high-voltage and high-power electric heating tube bundle.

6. The electric heating supplementary heat full dry quenching boiler power generation process system according to claim 1 is characterized in that: The high-voltage and high-power electric heating tube bundles are 6 to 12 sets, and the high-voltage and high-power electric heating tube bundles are powered by 10kV, with a power of 750 to 1500kW.

7. The method for using the electric heating supplementary heat full dry quenching boiler power generation process system according to any one of claims 1 to 6, characterized in that: When the 1# dry quenching furnace system and the 2# dry quenching furnace system are operating normally, if the coke oven load fluctuates and the operating load of a single dry quenching furnace system is less than 50% of its design capacity, the high-pressure and high-power electric heating tube bundle on the single supplementary heat drum is turned on for supplementary heat, and the power of the electric heating tube bundle is adjusted by the deviation of the main steam outlet pressure and temperature of the 1# dry quenching boiler subsystem and the 2# dry quenching boiler subsystem from the normal value, so as to expand the operating range of the dry quenching device to about 35% to 100% of the design capacity.

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