Heat storage peak regulation system for waste heat generator set

Abstract

The utility model discloses a heat storage peak regulation system for a waste heat generator set. The heat storage peak regulation system comprises a heat exchanger, a high-temperature storage tank, a high-pressure steam generation device and a low-temperature storage tank which are connected in sequence and form a loop. The low-pressure steam generating device is communicated with a low-temperature flue gas outlet of the heat exchanger; wherein a high-temperature flue gas inlet II of the heat exchanger is communicated with the high-temperature flue gas conveying pipeline, and a low-pressure steam outlet II of the low-pressure steam production device is communicated to the low-pressure steam conveying pipeline; a low-pressure water supply inlet II of the low-pressure steam production device is communicated with a low-pressure water supply conveying pipeline; wherein a high-pressure steam outlet II of the high-pressure steam generating device is communicated with the high-pressure steam conveying pipeline; and a high-pressure water supply inlet II of the high-pressure steam generating device is communicated with the high-pressure water supply conveying pipeline. The problems that in the prior art, when a waste heat generator set breaks down, heat of a heat recovery coke oven cannot be stably discharged; and when the heat recovery coke oven is overhauled and shut down, the heat of the waste heat generator set is lost.

Description

Technical field

[0001] The utility model belongs to the technical field of waste heat boiler utilization, and particularly relates to a heat storage peak regulation system for a waste heat generator set. [Background Technology]

[0002] A waste heat generator (WHRG) system consists of a waste heat boiler (HRS), a steam turbine, a water supply system, and a flue gas treatment system. The heat source for a WHRG system typically comes from a heat recovery coke oven. The heat released by the heat recovery coke oven completely burns the volatiles within the oven. The heat released by combustion first completes the coking process within the oven, while the remaining heat, in the form of high-temperature flue gas, is collected through a gas header and fed into the main flue. The high-temperature flue gas in the main flue enters the HRG to generate steam, which drives the steam turbine generator to generate electricity. The flue gas is then discharged from the HRG outlet and enters the flue gas treatment system.

[0003] Since heat recovery coke ovens are not allowed to shut down after operation, if the waste heat generator unit malfunctions, the heat from the heat recovery coke oven cannot be discharged stably, and normal production cannot be guaranteed. When the heat recovery coke oven is shut down for maintenance, the waste heat generator unit loses heat, and the unit stability cannot be guaranteed. Large fluctuations in unit load or start-up and shutdown affect the unit's efficiency and service life. [Utility Model Content]

[0004] The purpose of the utility model is to provide a heat storage and peak-shaving system for a waste heat power generation set, so as to solve the problem in the prior art that when the waste heat power generation set fails, the heat of the heat recovery coke oven cannot be discharged stably; and when the heat recovery coke oven is shut down for maintenance, the heat of the waste heat power generation set is lost.

[0005] The utility model adopts the following technical solution: a heat storage peak-shaving system for a waste heat power generation unit, based on a waste heat boiler, a high-temperature flue gas inlet I on the boiler is connected to a high-temperature flue gas delivery pipeline, a high-pressure steam outlet I on the boiler is connected to a high-pressure steam delivery pipeline, a low-pressure steam outlet I on the boiler is connected to a low-pressure steam delivery pipeline, a high-pressure water supply inlet I on the boiler is connected to a high-pressure water supply delivery pipeline, and a low-pressure water supply inlet I on the boiler is connected to a low-pressure water supply delivery pipeline;

[0006] The heat storage peak shaving system includes a heat exchanger, a high-temperature storage tank, a high-pressure steam generator, and a low-temperature storage tank connected in sequence to form a loop; and also includes a low-pressure steam generator connected to the low-temperature flue gas outlet of the heat exchanger;

[0007] Among them, the high-temperature flue gas inlet II of the heat exchanger is connected to the high-temperature flue gas transmission pipeline, the low-pressure steam outlet II of the low-pressure steam production device is connected to the low-pressure steam transmission pipeline; the low-pressure water supply inlet II of the low-pressure steam production device is connected to the low-pressure water supply transmission pipeline;

[0008] Among them, the high-pressure steam outlet II of the high-pressure steam production device is connected to the high-pressure steam transmission pipeline; the high-pressure water supply inlet II of the high-pressure steam production device is connected to the high-pressure water supply transmission pipeline.

[0009] Furthermore, the low-pressure steam delivery pipeline is respectively connected to the deaerator and / or the low-pressure steam pipeline network.

[0010] Furthermore, it also includes a heat recovery coke oven, which is connected to the waste heat boiler through a high-temperature flue gas conveying pipeline.

[0011] Furthermore, the low-temperature flue gas outlet of the waste heat boiler is connected to a flue gas treatment device, and the flue gas outlet of the low-pressure steam production device is connected to the flue gas treatment device through an induced draft fan.

[0012] The beneficial effects of the present invention are as follows: a heat storage and peak-shaving system is connected to the waste heat boiler, and the heat storage and peak-shaving system uses the high-temperature flue gas generated by the heat recovery coke oven to heat the heat storage medium, and then uses the high-temperature heat storage medium to heat the feed water of the waste heat generator set to generate high-pressure steam for the steam turbine to generate electricity. The heat storage and peak-shaving system adopts a dual storage tank form of a high-temperature storage tank and a low-temperature storage tank, and the heat charging process and the heat release process do not affect each other. When the waste heat generator set fails, the heat of the heat recovery coke oven is stored in the heat storage and peak-shaving system, which solves the problem of heat not being able to be discharged stably. When the heat recovery coke oven needs to be shut down for maintenance, the heat storage and peak-shaving system provides heat to the waste heat generator set, ensuring the continuous supply of heat to the waste heat generator set and solving the problem of heat loss in the waste heat generator set.

Brief Description of the Drawings

[0013] Figure 1 This is a structural schematic diagram of a heat storage peak-shaving system for a waste heat power generation unit according to the present invention;

[0014] Figure 2 This is a system application schematic diagram of a heat storage peak-shaving system for a waste heat power generation unit according to the present invention.

[0015] Among them: 1. heat storage peak shaving system, 11. heat exchanger, 12. low-pressure steam generator, 13. induced draft fan, 14. high-temperature storage tank, 15. low-temperature storage tank, 16. high-pressure steam generator, 17. circulation pump, 18. high-temperature heat release pump;

[0016] 2. Heat recovery coke oven, 3. Waste heat boiler, 4. Steam turbine, 5. Condenser, 6. Deaerator, 7. High-pressure feed water pump, 8. Low-pressure feed water pump, 9. Flue gas induced draft fan, 10. Condensate pump;

[0017] 20. High-temperature flue gas transmission pipeline, 21. High-pressure steam transmission pipeline, 22. Low-pressure water supply transmission pipeline, 23. Low-pressure steam transmission pipeline, 24. High-pressure water supply transmission pipeline. [Specific implementation method]

[0018] The present invention will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0019] The utility model provides a heat storage peak regulation system for waste heat generator sets, such as Figure 1 and Figure 2 As shown, it includes a waste heat boiler 3 and a heat storage peak-shaving system 1. The waste heat boiler 3 is part of the waste heat power generation unit.

[0020] The waste heat boiler 3 has a high-temperature flue gas inlet I, a high-pressure steam outlet I, a low-pressure steam outlet I, a high-pressure water supply inlet I, and a low-pressure water supply inlet I. The high-temperature flue gas inlet I is connected to a high-temperature flue gas delivery pipeline 20, the high-pressure steam outlet I is connected to a high-pressure steam delivery pipeline 21, the low-pressure steam outlet I is connected to a low-pressure steam delivery pipeline 23, the high-pressure water supply inlet I is connected to a high-pressure water supply pipeline 24, and the low-pressure water supply inlet I is connected to a low-pressure water supply pipeline 22.

[0021] The heat storage peak-shaving system 1 includes a heat exchanger 11, a high-temperature storage tank 14, a high-pressure steam generator 16, and a low-temperature storage tank 15, which are connected in sequence to form a loop. A heat storage medium circulates within this loop. A circulation pump 17 can be provided between the low-temperature storage tank 15 and the heat exchanger 11, and a high-temperature heat release pump 18 can be provided between the high-temperature storage tank 14 and the high-pressure steam generator 16.

[0022] Heat exchanger 11 has a high-temperature flue gas inlet II and a low-temperature flue gas outlet. Thermal storage and peak-shaving system 1 also includes a low-pressure steam generator 12 connected to the low-temperature flue gas outlet. Low-pressure steam generator 12 has a low-pressure steam outlet II and a low-pressure feedwater inlet II. High-pressure steam generator 16 has a high-pressure steam outlet II and a high-pressure feedwater inlet II.

[0023] Heat exchanger 11 is a medium-temperature heat exchanger. In actual use, the heat content of the high-temperature flue gas entering the heat recovery coke oven 2 is typically ≤600°C. The inlet temperature of the heat storage medium entering heat exchanger 11 is ≤600°C, and the outlet temperature of the heat storage medium exiting heat exchanger 11 is ≤450°C. For high-pressure steam generator 16, the inlet temperature of the heat storage medium is <450°C, and the outlet temperature of the heat absorption medium is <400°C.

[0024] Connect the high-temperature flue gas inlet II of the heat exchanger 11 to the high-temperature flue gas delivery pipeline 20, connect the low-pressure steam outlet II of the low-pressure steam generator 12 to the low-pressure steam delivery pipeline 23, and then connect the low-pressure water supply inlet II of the low-pressure steam generator 12 to the low-pressure water supply pipeline 22. This connection allows the heat storage and peak-shaving system to operate in a charging mode. When the waste heat power generation unit malfunctions, heat from the heat recovery coke oven 2 can be stored in the heat storage and peak-shaving system 1, activating the charging mode. This ensures normal operation of the heat recovery coke oven 2 and reduces waste heat resources.

[0025] The high-pressure steam outlet II of the high-pressure steam generator 16 is connected to the high-pressure steam delivery pipeline 21, and the high-pressure water inlet II of the high-pressure steam generator 16 is connected to the high-pressure water delivery pipeline 24. This connection enables the heat release mode of the heat storage and peak-shaving system. If the heat recovery coke oven 2 malfunctions, the heat stored in the heat storage and peak-shaving system 1 can be released, activating the heat release mode. This ensures normal operation of the waste heat generator set in the short term and continuous operation or hot start-up at minimum load for the long term.

[0026] In summary, in the heat storage and peak-shaving system 1, the heat exchanger 11 is used to utilize the heat of the high-temperature flue gas in the high-temperature flue gas transmission pipeline 20 to heat the heat storage medium in the heat storage and peak-shaving system 1, and store the heated heat storage medium in the high-temperature storage tank 14; the high-pressure steam production device 16 is used to utilize the heat of the high-temperature heat storage medium stored in the high-temperature storage tank 14 to generate high-pressure steam, and transport the high-pressure steam to the high-pressure steam transmission pipeline 21.

[0027] The present invention utilizes a heat storage and peak-shaving system for a waste heat power generation unit. This system uses a heat storage medium as the heat carrier during the charging and discharging processes. The unstable heat generated by a heat recovery coke oven (2) is stored in the heat charging side of the heat storage and peak-shaving system (1), which then stably outputs the heat through the heat discharging side of the heat storage and peak-shaving system (1). If the waste heat power generation unit malfunctions, the heat output from the heat recovery coke oven (2) can be stored in the heat storage and peak-shaving system (1), ensuring normal operation of the heat recovery coke oven (2). If the heat recovery coke oven (2) malfunctions, the heat stored in the heat storage and peak-shaving system (1) can be released to the waste heat power generation unit, ensuring its normal operation.

[0028] The waste heat boiler 3 is connected to the steam turbine 4 via the high-pressure steam delivery pipeline 21. High-pressure steam is delivered to the steam turbine 4 via the high-pressure steam delivery pipeline 21 to drive it to generate electricity. The outlet of the steam turbine 4 is connected to the deaerator 6 via the condenser 5 and the condensate pump 10. The deaerator 6 returns steam to the waste heat boiler 3 via the low-pressure feedwater delivery pipeline 22 and the high-pressure feedwater delivery pipeline 24, respectively. The low-pressure feedwater delivery pipeline 22 and the high-pressure feedwater delivery pipeline 24 are respectively equipped with a low-pressure feedwater pump 8 and a high-pressure feedwater pump 7, which can fully utilize the high-temperature waste heat of the flue gas.

[0029] In some embodiments, the low-pressure steam delivery pipeline 23 is connected to the deaerator 6 and / or the low-pressure steam network. Depending on the quality of the low-pressure steam, it can be selected to be reused in the deaerator 6 of this system or to be delivered to the low-pressure steam network.

[0030] In some embodiments, a heat recovery coke oven 2 is further included, and the heat recovery coke oven 2 is connected to the waste heat boiler 3 through the high-temperature flue gas conveying pipeline 20. The heat recovery coke oven can be a coal-fired furnace or a gas-fired furnace.

[0031] In some embodiments, the low-temperature flue gas outlet of the waste heat boiler 3 is connected to a flue gas treatment device via an induced draft fan 9. This induced draft fan 9 draws the flue gas to an environmental protection facility for treatment, filtering out impurities such as sulfides and ensuring that the flue gas meets emission standards. The flue gas outlet of the low-pressure steam generator 12 is connected to the flue gas treatment device via an induced draft fan 13. Separately providing induced draft fan 9 and 13 allows for independent adjustment of induced draft fan 13, minimizing the impact on the original waste heat boiler's flue gas emission system.

[0032] like Figure 1 As shown, a high-temperature heat source valve A is provided at the high-temperature flue gas inlet II of the heat exchanger 11; a low-temperature heat source valve B is provided at the outlet of the induced draft fan 13; a high-pressure water supply valve C is provided at the high-pressure water supply inlet II of the high-pressure steam generator 16, and a high-pressure steam valve D is provided at the high-pressure water supply inlet II of the high-pressure steam generator 16; a low-pressure water supply valve E is provided at the low-pressure water supply inlet II of the low-pressure steam generator 12, and a low-pressure steam valve F is provided at the low-pressure steam outlet II of the low-pressure steam generator 12.

[0033] like Figure 2 As shown, the utility model provides a heat charging method for a heat storage peak-shaving system of a waste heat generator set:

[0034] The high-temperature flue gas inlet II of the heat exchanger 11 in the heat storage and peak-shaving system 1 is connected to the high-temperature flue gas delivery pipeline 20, and the low-pressure steam outlet II of the low-pressure steam generator 12 is connected to the low-pressure steam delivery pipeline 23. The low-pressure water supply inlet II of the low-pressure steam generator 12 is then connected to the low-pressure water supply pipeline 22. With this connection, if the waste heat power generation unit fails, the heat from the heat recovery coke oven 2 can be stored in the heat storage and peak-shaving system 1, thus ensuring normal production of the heat recovery coke oven 2 and reducing the waste of waste heat resources.

[0035] Among them, the high-temperature heat source valve A, the low-temperature heat source valve B, the high-pressure steam valve D, and the low-pressure steam valve F are fully open; the induced draft fan 13 and the circulating pump 17 operate at a high frequency; the high-temperature heat release pump 18 operates at a low frequency; the high-pressure water supply valve C is opened slightly; and the low-pressure water supply valve E is opened widely.

[0036] Specifically, a portion of the high-temperature flue gas generated by heat recovery coke oven 2 enters waste heat boiler 3, while another portion is diverted to heat storage and peak-shaving system 1 for heat storage. The high-temperature flue gas passes through heat exchanger 11 to heat the heat storage medium, which is then stored in high-temperature storage tank 14 to achieve heat storage.

[0037] The low-pressure water supply of the heat storage peak-shaving system 1 is provided by the low-pressure water supply of the waste heat generator set, and the flow rate of the water supply can be adjusted by the low-pressure water supply valve.

[0038] The low-pressure steam generated by the heat storage peak-shaving system 1 is incorporated into the low-pressure steam transmission pipeline 23 of the waste heat generator set. One path of low-pressure steam returns to the waste heat boiler 3 through the deaerator 6, and the other path of low-pressure steam directly enters the low-pressure steam pipeline network.

[0039] The heat storage peak shaving system 1 can adjust the flue gas flow rate through the induced draft fan 13. The flue gas discharged from the heat storage peak shaving system 1 merges with the flue gas after heat release from the waste heat boiler and enters the flue gas treatment device of the waste heat generator set.

[0040] like Figure 2 As shown, the utility model provides a heat release method for a heat storage peak regulation system of a waste heat power generation unit:

[0041] The high-pressure steam outlet II of the high-pressure steam generator 16 in the heat storage and peak-shaving system 1 is connected to the high-pressure steam delivery pipeline 21, and the high-pressure water inlet II of the high-pressure steam generator 16 is connected to the high-pressure water delivery pipeline 24. With this connection, if the heat recovery coke oven 2 malfunctions, the heat stored in the heat storage and peak-shaving system 1 can be released. This ensures normal operation of the waste heat generator set in the short term and continuous operation or hot start-up at minimum load for the long term.

[0042] Among them, the high-temperature heat source valve A, the low-temperature heat source valve B, the high-pressure steam valve D, and the low-pressure steam valve F are fully open; the induced draft fan 13, the circulation pump 17, and the high-temperature heat release pump 18 operate at a high frequency; the high-pressure water supply valve C and the low-pressure water supply valve E are widely opened.

[0043] Specifically, the heat storage medium enters the high-pressure steam generator 16 from the high-temperature storage tank 14, where it heats the high-pressure feedwater, generating high-pressure steam. This steam is then fed into the high-pressure steam transmission pipeline 21 and ultimately into the steam turbine 4 of the waste heat generator set. The high-pressure feedwater for the thermal storage peak-shaving system 1 is provided by the high-pressure feedwater of the waste heat generator set, and the flow rate is regulated by a high-pressure feedwater valve.

Claims

1. A heat storage peak-shaving system for a waste heat power generation unit, characterized in that: Based on a waste heat boiler (3), a high-temperature flue gas inlet I thereon is connected to a high-temperature flue gas delivery pipeline (20), a high-pressure steam outlet I thereon is connected to a high-pressure steam delivery pipeline (21), a low-pressure steam outlet I thereon is connected to a low-pressure steam delivery pipeline (23), a high-pressure water supply inlet I thereon is connected to a high-pressure water supply delivery pipeline (24), and a low-pressure water supply inlet I thereon is connected to a low-pressure water supply delivery pipeline (22); The heat storage peak-shaving system (1) comprises a heat exchanger (11), a high-temperature storage tank (14), a high-pressure steam production device (16), and a low-temperature storage tank (15) which are sequentially connected and arranged to form a loop; and further comprises a low-pressure steam production device (12) which is connected to the low-temperature flue gas outlet of the heat exchanger (11); The high-temperature flue gas inlet II of the heat exchanger (11) is connected to the high-temperature flue gas delivery pipeline (20), the low-pressure steam outlet II of the low-pressure steam production device (12) is connected to the low-pressure steam delivery pipeline (23); the low-pressure water supply inlet II of the low-pressure steam production device (12) is connected to the low-pressure water supply delivery pipeline (22); The high-pressure steam outlet II of the high-pressure steam production device (16) is connected to the high-pressure steam delivery pipeline (21); the high-pressure water supply inlet II of the high-pressure steam production device (16) is connected to the high-pressure water supply delivery pipeline (24).

2. A heat storage peak-shaving system for a waste heat power generation unit according to claim 1, characterized in that: The low-pressure steam delivery pipeline (23) is respectively connected to the deaerator (6) and / or the low-pressure steam pipeline network.

3. A heat storage peak-shaving system for a waste heat power generation unit according to claim 1 or 2, characterized in that: It also includes a heat recovery coke oven (2), and the heat recovery coke oven (2) is connected to the waste heat boiler (3) through the high-temperature flue gas conveying pipeline (20).

4. A heat storage peak-shaving system for a waste heat power generation unit according to claim 1 or 2, characterized in that: The low-temperature flue gas outlet of the waste heat boiler (3) is connected to a flue gas treatment device, and the flue gas outlet of the low-pressure steam production device (12) is connected to the flue gas treatment device via an induced draft fan (13).

Images