Dry quenching waste heat generator set with heat storage and peak regulation functions

Abstract

The utility model discloses a dry quenching waste heat generator set with heat storage and peak regulation functions, which comprises a quenching furnace, an outlet of the quenching furnace is communicated with a waste heat boiler through a primary dust remover, and the waste heat boiler returns to an inlet of the quenching furnace through a secondary dust remover; an inlet of the heat exchanger is communicated with the quenching furnace; an outlet of the low-temperature storage tank is sequentially communicated with the heat exchanger, the high-temperature storage tank and the high-pressure steam generating device and then returns to the low-temperature storage tank to form a circulation loop of the heat exchange medium; the high-temperature storage tank is used for storing heat absorbed from the heat exchanger; the high-temperature storage tank is also used for releasing heat to the high-pressure steam generating device to generate high-pressure steam; a high-pressure steam outlet of the waste heat boiler communicates with the steam turbine, and the steam turbine passes through the condenser, the condensate pump, the deaerator and the high-pressure water feeding pump and then returns to the waste heat boiler to form a circulation loop. The problem that an existing coke quenching furnace and an existing waste heat generator set are high in coupling performance and cooperation degree, and consequently the adjusting flexibility of the waste heat generator set is poor is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste heat power generation, and particularly relates to a coke dry quenching waste heat power generation unit with a heat storage and peak shaving function.

Background Art

[0002] The coke dry quenching waste heat power generation unit includes a waste heat boiler, a steam turbine generator, a water supply device, a gas circulation device, etc. The hot coke generated in the coking process is poured into the coke quenching furnace from the top of the coke quenching furnace through a lifting device. Inert gas is blown into the bottom of the coke quenching furnace for coke quenching. The high-temperature gas generated during the coke quenching process is discharged from the upper part of the coke quenching furnace and enters the inlet of the waste heat boiler after primary dust removal. The low-temperature gas cooled in the waste heat boiler is discharged from the outlet of the waste heat furnace and sequentially passes through secondary dust removal, a circulation fan, and a heat pipe heat exchanger and returns to the bottom of the coke quenching furnace to complete the gas circulation. The heat released by the coke quenching gas in the waste heat boiler heats the feed water to generate steam, and the steam drives the steam turbine generator to generate electricity.

[0003] During the entire coking process, the coke quenching furnace must operate normally to ensure coke quenching. Therefore, when the waste heat power generation unit fails, the heat of the coke quenching furnace cannot be discharged, and normal coke quenching cannot be guaranteed. When the coke quenching furnace is shut down for maintenance, the waste heat power generation unit lacks heat, and the load of the unit fluctuates greatly, or starting and stopping affect the efficiency and service life of the unit.

Content of the Utility Model

[0004] The purpose of the utility model is to provide a coke dry quenching waste heat power generation unit with a heat storage and peak shaving function, so as to solve the problems that when the waste heat power generation unit in the prior art fails, the heat of the coke quenching furnace cannot be discharged, and normal coke quenching cannot be guaranteed. When the coke quenching furnace is shut down for maintenance, the waste heat power generation unit lacks heat, and the load of the unit fluctuates greatly, or starting and stopping affect the efficiency and service life of the unit.

[0005] The utility model adopts the following technical solutions: A coke dry quenching waste heat power generation unit with a heat storage and peak shaving function, comprising:

[0006] A coke quenching furnace, whose outlet is connected to a waste heat boiler through a primary dust collector, and the waste heat boiler also returns to the inlet of the coke quenching furnace through a secondary dust collector; used for dust removal of flue gas and transferring heat to the waste heat boiler;

[0007] A heat exchanger, whose inlet is connected to the coke quenching furnace, used for introducing the flue gas after primary dust removal and absorbing its heat; its outlet is also connected to a low-pressure steam generation device and uses waste heat to generate low-pressure steam;

[0008] A low-temperature storage tank, the outlet of the low-temperature storage tank is sequentially connected to the heat exchanger, a high-temperature storage tank, and a high-pressure steam generation device, and then returns to the low-temperature storage tank to form a circulation loop of the heat exchange medium; the high-temperature storage tank is used for storing the heat absorbed from the heat exchanger; the high-temperature storage tank is also used for releasing heat to the high-pressure steam generation device to generate high-pressure steam;

[0009] The high-pressure steam outlet of the waste heat boiler is connected to the steam turbine. The steam turbine passes through the condenser, condensate pump, deaerator, and high-pressure feed water pump, and then returns to the waste heat boiler to form a circulation loop.

[0010] Furthermore, the high-pressure steam outlet pipeline of the high-pressure steam generation device is merged with the high-pressure steam outlet pipeline of the waste heat boiler for connection to the steam turbine.

[0011] Furthermore, the outlet of the high-pressure feed water pump is branched to the high-pressure feed water inlet of the high-pressure steam generation device.

[0012] Furthermore, the low-pressure steam outlets of the low-pressure steam generation device are respectively connected to the deaerator and / or the low-pressure steam utilization pipe network.

[0013] Furthermore, the flue gas outlet of the low-pressure steam generation device is connected to the secondary dust collector through a circulation fan.

[0014] Furthermore, the outlet of the deaerator is also connected to the low-pressure steam generation device through a low-pressure feed water pump.

[0015] The beneficial effects of the present utility model are as follows: A heat storage system is configured between the coke quenching furnace and the waste heat power generation unit. The heat storage system includes a low-temperature storage tank and a high-temperature storage tank. It uses the high-temperature coke quenching gas of the coke quenching furnace to heat the heat transfer medium, and then uses the heat transfer medium to heat the feed water of the waste heat power generation unit to generate steam for power generation. When the waste heat power generation unit fails, the heat of the high-temperature coke quenching gas of the coke quenching furnace can be stored in the heat storage system to ensure the low-temperature gas source required for normal coke quenching of the coke quenching furnace and reduce waste of waste heat resources; when the coke quenching furnace fails, the heat stored in the heat storage system can be released to generate steam, which can ensure the normal operation of the waste heat power generation unit in a short time, and can ensure that the waste heat power generation unit operates at the minimum load without shutdown or hot start in a long time.

Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of a dry coke quenching waste heat power generation unit with a heat storage and peak shaving function of the present utility model.

[0017] Among them, 1. Waste heat boiler, 2. Heat exchanger, 3. Low-pressure steam generation device, 4. Circulation fan, 5. Low-pressure feed water pump, 6. Low-temperature storage tank, 7. High-temperature storage tank, 8. High-pressure steam generation device, 9. Heat absorption pump, 10. Heat release pump, 11. Deaerator, 12. Coke quenching furnace, 13. Primary dust collector, 14. Secondary dust collector, 15. Steam turbine, 16. Condenser, 17. Condensate pump, 18. High-pressure feed water pump.

Detailed Embodiments

[0018] The present utility model will be described in detail below in conjunction with the drawings and specific embodiments.

[0019] The utility model provides a coke dry quenching waste heat generating unit with a heat storage and peak shaving function, as Figure 1 shown, which includes a coke quenching furnace 12 and a heat storage system. The heat storage system includes a heat exchanger 2, a low-temperature storage tank 6, a high-temperature storage tank 7, a low-pressure steam generation device 3, a high-pressure steam generation device 8, etc. Using a heat transfer medium as the heat carrier for the charging and discharging processes, the unstable heat generated by the coke quenching furnace 12 is stored in the heat charging side of the heat storage system, and then the heat is stably output through the heat discharging side of the heat storage system.

[0020] Specifically, the outlet of the coke quenching furnace 12 is connected to the waste heat boiler 1 through a primary dust collector 13, and the waste heat boiler 1 also returns to the inlet of the coke quenching furnace 12 through a secondary dust collector 14; it is used for dust removal of the flue gas and transferring heat to the waste heat boiler 1.

[0021] The inlet of the heat exchanger 2 is connected to the coke quenching furnace 12, which is used to introduce the flue gas after primary dust removal and absorb its heat; its outlet is also connected to the low-pressure steam generation device 3, and low-pressure steam is generated using the waste heat. One or more groups of heat exchangers 2 can be set according to requirements. Multiple groups of heat exchangers 2 can be connected in series at multiple levels according to the principle of cascade utilization.

[0022] The outlet of the low-temperature storage tank 6 is successively connected to the heat exchanger 2, the high-temperature storage tank 7, and the high-pressure steam generation device 8, and then returns to the low-temperature storage tank 6 to form a circulation loop of the heat transfer medium; the high-temperature storage tank 7 is used to store the heat absorbed from the heat exchanger 2; the high-temperature storage tank 7 is also used to release heat to the high-pressure steam generation device 8 to generate high-pressure steam;

[0023] The high-pressure steam outlet of the waste heat boiler 3 is connected to the steam turbine 4, which is used to drive it for power generation. The steam turbine 4 passes through a condenser 16, a condensate pump 17, a deaerator 11, and a high-pressure feed water pump 18, and then returns to the waste heat boiler 3 to form a circulation loop.

[0024] All or part of the coke quenching high-temperature gas generated by the coke quenching furnace 12 passes through the heat exchanger 2, and the high-temperature gas heats the heat transfer medium. After the heat transfer medium reaches the heating effect, it is stored in the high-temperature storage tank to complete the heat charging process. The heat transfer medium enters the high-pressure steam generation device from the high-temperature storage tank, heats the feed water to generate steam, and then returns to the low-temperature storage tank to complete the heat discharging process.

[0025] In some embodiments, the high-pressure steam outlet pipeline of the high-pressure steam generation device 8 is merged with the high-pressure steam outlet pipeline of the waste heat boiler 1, which is used to connect to the steam turbine 15. The high-pressure steam generated by the high-temperature storage tank 7 releasing heat to the high-pressure steam generation device 8 can be supplied to the steam turbine 4.

[0026] In some embodiments, the outlet of the high-pressure feed water pump 18 is branched to the high-pressure feed water inlet of the high-pressure steam generation device 8. The feed water of the high-pressure steam generation device 8 comes from the high-pressure feed water pump 18.

[0027] In some embodiments, the low-pressure steam outlets of the low-pressure steam generation device 3 are respectively connected to the deaerator 11 and / or the low-pressure steam consumption pipe network. According to the quality of the low-pressure steam, it can be selected to enter the deaerator 11 of this system for reuse, or it can be selected to be sent to the low-pressure steam consumption pipe network.

[0028] In some embodiments, the flue gas outlet of the low-pressure steam generation device 3 is connected to the secondary dust collector 14 through the circulation fan 4 for dust removal and environmental protection treatment.

[0029] In some embodiments, the outlet of the deaerator 6 is also connected to the low-pressure steam generation device 3 through the low-pressure feed water pump 5. The feed water of the low-pressure steam generation device 3 is provided by the low-pressure feed water pump 5.

[0030] The heat charging process of a coke dry quenching waste heat power generation unit with a heat storage and peak shaving function according to the present invention is as follows:

[0031] The high-temperature coke quenching gas generated by the coke quenching furnace 12, all or a part of it, enters the heat storage system, and the other part enters the waste heat boiler 1. The gas flow rate entering the heat storage system is adjusted by the circulation fan 4 of the heat storage system. The high-temperature coke quenching gas entering the heat storage system heats the heat transfer medium. After the gas heating the heat transfer medium, the temperature decreases, and then it enters the low-pressure steam generation device 3 to heat the low-pressure feed water to generate low-pressure steam. After that, the low-temperature gas returns from the outlet of the low-pressure steam generation device 3 through the circulation fan 4 to the outlet of the waste heat boiler 1. The low-pressure feed water comes from the deaerator 11 of the waste heat power generation unit. A low-pressure feed water pump 5 is configured on the outlet branch pipe of the deaerator 11 to provide low-pressure feed water for the low-pressure steam generation device 3, and the low-pressure feed water flow rate can be adjusted by using the low-pressure feed water valve. The low-pressure steam generated by the low-pressure steam generation device 3 returns to the waste heat power generation unit thermal system to heat the deaerator 11 or directly enters the external low-pressure steam consumption pipe network.

[0032] The heat discharging process of a coke dry quenching waste heat power generation unit with a heat storage and peak shaving function according to the present invention is as follows:

[0033] The heat transfer medium enters the high-pressure steam generation device 8 from the high-temperature storage tank 7 to heat the high-pressure feed water to generate high-pressure steam, and then returns to the low-temperature storage tank 6. The high-pressure feed water is provided by the outlet branch of the high-pressure feed water pump 18 of the waste heat power generation unit, and the flow rate is adjusted by relying on the high-pressure feed water valve. The generated high-pressure steam enters the waste heat power generation unit for power generation.

[0034] In summary, the heat storage system adopts the form of high- and low-temperature double storage tanks, and the heat charging process and heat discharging process do not affect each other. When the waste heat power generation unit fails, the heat of the coke quenching gas in the coke quenching furnace can be stored in the heat storage system to reduce the temperature of the coke quenching gas and ensure the normal coke quenching of the coke quenching furnace; when the coke quenching furnace fails, the stored heat can be released to the waste heat power generation unit to ensure the short-term normal operation or long-term non-stop operation of the waste heat power generation unit. The heat charging process can absorb the heat of the unstable coke quenching gas generated by the coke quenching furnace for storage; the heat discharging process can stably output the stored heat and stabilize the waste heat power generation unit. The heat charging process and the heat discharging process are independent of each other, which can decouple the heat source side and the power generation side, enabling the power generation side to have the ability of independent and flexible adjustment. The independent and flexible adjustment of the power generation side can achieve the power demand side response, realize the peak shaving and consumption of new energy by the waste heat power generation unit, obtain the peak-valley difference benefit through peak shaving, and reduce the production cost of the enterprise.

[0035] The utility model configures a set of heat storage system between the coke quenching furnace and the waste heat power generation unit. The heat storage system includes a low-temperature storage tank and a high-temperature storage tank, which uses the high-temperature coke quenching gas of the coke quenching furnace to heat the heat exchange medium, and then uses the heat exchange medium to heat the feed water of the waste heat power generation unit to generate steam for power generation. The intervention of the heat storage system realizes the decoupling of the heat generated by the coke quenching furnace and the steam generated by the waste heat power generation unit. When the waste heat power generation unit fails, the heat of the high-temperature coke quenching gas of the coke quenching furnace can be stored in the heat storage system to ensure the low-temperature gas source required for the normal coke quenching of the coke quenching furnace and reduce the waste of waste heat resources; when the coke quenching furnace fails, the heat stored in the heat storage system can be released to generate steam, which can ensure the normal operation of the waste heat power generation unit in a short time and ensure the non-stop operation at the minimum load or hot start of the waste heat power generation unit in a long time.

Claims

1. A coke dry quenching waste heat power generation unit with a heat storage and peak shaving function, characterized in that Including: A coke quenching furnace (12), the outlet of which is connected to a waste heat boiler (1) through a primary dust collector (13), and the waste heat boiler (1) also returns to the inlet of the coke quenching furnace (12) through a secondary dust collector (14); for dust removal of flue gas and transferring heat to the waste heat boiler (1); A heat exchanger (2), the inlet of which is connected to the coke quenching furnace (12), for introducing the flue gas after primary dust removal and absorbing its heat; Its outlet is also connected to a low-pressure steam generating device (3), and low-pressure steam is generated by using waste heat; A low-temperature storage tank (6), the outlet of the low-temperature storage tank (6) is successively connected to the heat exchanger (2), a high-temperature storage tank (7), and a high-pressure steam generating device (8), and then returns to the low-temperature storage tank (6) to form a circulation loop of the heat transfer medium; the high-temperature storage tank (7) is used for storing the heat absorbed from the heat exchanger (2); the high-temperature storage tank (7) is also used for releasing heat to the high-pressure steam generating device (8) to generate high-pressure steam; The high-pressure steam outlet of the waste heat boiler (1) is connected to a steam turbine (15), and the steam turbine (15) passes through a condenser (16), a condensate pump (17), a deaerator (11), and a high-pressure feed water pump (18), and then returns to the waste heat boiler (1) to form a circulation loop.

2. The coke dry quenching waste heat power generation unit with heat storage and peak shaving function according to claim 1, characterized in that, The high-pressure steam outlet pipeline of the high-pressure steam generating device (8) is merged with the high-pressure steam outlet pipeline of the waste heat boiler (1) and is used for connecting to the steam turbine (15).

3. The coke dry quenching waste heat generating unit with heat storage and peak shaving function as claimed in claim 2, wherein, The outlet of the high-pressure feed water pump (18) is branched to the high-pressure feed water inlet of the high-pressure steam generating device (8).

4. The coke dry quenching waste heat generating unit with heat storage and peak shaving function according to claim 1, characterized in that, The low-pressure steam outlet of the low-pressure steam generating device (3) is respectively connected to the deaerator (11) and / or a low-pressure steam using pipe network.

5. A coke dry quenching waste heat power generation unit with a heat storage and peak shaving function according to claim 1, characterized in that, The flue gas outlet of the low-pressure steam generating device (3) is connected to the secondary dust collector (14) through a circulation fan (4).

6. The coke dry quenching waste heat generating unit with heat storage and peak shaving function as claimed in claim 1, wherein The outlet of the deaerator (11) is also connected to the low-pressure steam generating device (3) through a low-pressure feed water pump (5).

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