Waste heat boiler power generation system

Abstract

The utility model discloses a waste heat boiler power generation system which comprises a waste heat boiler, a steam turbine, a power generator, a condenser, a water feeding pump, a water heating device and a water supplementing system. The waste heat boiler power generation system further comprises an economizer, a heat exchanger, a regenerative heater and a drainage device. The smoke output end of the waste heat boiler is connected to the input end of the heat exchanger. The output end of the feed pump is connected to the other input end of the heat exchanger; the output end of the heat exchanger is connected to one input end of the regenerative heater; the other output end of the regenerative heater is connected to the input end of the economizer; the output end of the economizer is connected to the other input end of the waste heat boiler; in this way, flue gas waste heat of the waste heat boiler is used for preheating, the initial temperature of the feed water is increased, the preheated feed water enters the regenerative heater, the temperature of the feed water is remarkably increased through two-stage heating, waste gas waste heat can be more efficiently absorbed, the waste gas emission temperature is reduced, the heat load of the waste heat boiler is reduced, and the overall heat efficiency of the system is improved.

Description

Technical Field

[0001] This utility model relates to the field of waste heat boiler power generation systems, and in particular to a waste heat boiler power generation system. Background Technology

[0002] Waste heat power generation systems are power generation technologies that convert the heat energy in waste gas into electrical energy. The corresponding power generation system is a waste heat power generation system. The heat source of a waste heat power generation system comes from the waste gas heat source in various industrial processes. Through a waste heat boiler, the heat energy in the waste gas heat source is converted into waste heat resources through a process of "waste gas heat energy - working fluid heat energy - mechanical energy - electrical energy", which is also an energy conversion process.

[0003] Waste heat, as a recyclable low-grade energy source, is widely present in many industrial production processes, such as steel smelting, chemical manufacturing, cement production, and glass manufacturing. If the large amounts of waste heat generated by these industrial processes are directly released into the environment, it not only results in a huge waste of energy but also has a negative impact on the ecological environment.

[0004] Traditional waste heat boiler power generation systems face numerous problems in energy recovery and utilization. Firstly, the waste heat utilization rate is low, primarily due to significant energy losses during the transfer and conversion process. For instance, when absorbing waste heat, the boiler cannot fully transfer the energy from the waste heat to the working fluid, resulting in some waste heat being wasted with the flue gas. Simultaneously, the working fluid also struggles to convert all the absorbed heat into electrical energy during its work, leading to substantial energy waste.

[0005] Therefore, a new technical solution needs to be researched to address the above problems. Utility Model Content

[0006] In view of this, the present invention addresses the deficiencies of the existing technology, and its main objective is to provide a waste heat boiler power generation system. Through the structural design and coordination between a heat exchanger, a regenerative heater, and a steam turbine, the output end of the heat exchanger is connected to one input end of the regenerative heater; the other output end of the steam turbine is connected to the input end of the regenerative heater via an extraction pipe. In this way, the waste heat from the flue gas of the waste heat boiler is used for preheating, increasing the initial temperature of the feedwater. The preheated feedwater enters the regenerative heater, and through two-stage heating, the feedwater temperature is significantly increased, enabling more efficient absorption of waste heat from the exhaust gas, reducing the exhaust gas emission temperature, reducing the heat load of the waste heat boiler, and improving the overall thermal efficiency of the system.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A waste heat boiler power generation system includes a waste heat boiler, a steam turbine, a generator, a condenser, a feedwater pump, a water heating device, and a makeup water system; the steam turbine drives the generator to generate electricity; one output end of the waste heat boiler is connected to one input end of the steam turbine; one output end of the steam turbine is connected to the input end of the condenser; the output end of the condenser is connected to the input end of the feedwater pump; wherein, the makeup water system is connected to the feedwater pump through another pipeline;

[0009] The waste heat boiler power generation system also includes an economizer, a heat exchanger, a regenerating heater, and a condensate drain device for collecting and discharging condensate from the regenerating heater.

[0010] The flue gas output end of the waste heat boiler is connected to the input end of the heat exchanger; the output end of the feedwater pump is connected to the other input end of the heat exchanger; the output end of the heat exchanger is connected to one input end of the regenerator; the other output end of the steam turbine is connected to the input end of the regenerator through an extraction pipe; one output end of the regenerator is connected to a drain device; the other output end of the regenerator is connected to the input end of the economizer; and the output end of the economizer is connected to the other input end of the waste heat boiler.

[0011] As a preferred embodiment, the regenerative heater includes a low-pressure heater, a medium-pressure heater, and a high-pressure heater; the extraction pipeline includes a low-pressure extraction pipeline, a medium-pressure extraction pipeline, and a high-pressure extraction pipeline; the steam turbine is connected to the low-pressure heater, the medium-pressure heater, and the high-pressure heater through the low-pressure extraction pipeline, the medium-pressure extraction pipeline, and the high-pressure extraction pipeline, respectively; the output end of the low-pressure heater is connected to the input end of the medium-pressure heater, the output end of the medium-pressure heater is connected to the input end of the high-pressure heater, and the output end of the high-pressure heater is connected to the economizer.

[0012] As a preferred embodiment, the condensate drain device includes a condensate tank and a condensate drainer; the condensate tank is used to temporarily store condensate; the condensate drainer is used to automatically discharge condensate, and both the condensate tank and the condensate drainer are connected to the regenerator heater through condensate drain pipes to prevent condensate accumulation from affecting heating efficiency.

[0013] As a preferred embodiment, a temperature sensor for monitoring the feedwater temperature of the heat exchanger and the regenerating heater, and a first pressure sensor for monitoring the feedwater pressure between the heat exchanger and the regenerating heater are respectively installed between the output end of the heat exchanger and the regenerating heater.

[0014] As a preferred embodiment, the turbine's extraction pipe is also equipped with a steam regulating valve for adjusting the steam flow rate entering the regenerator.

[0015] As a preferred embodiment, a second pressure sensor for monitoring the main steam pressure of the waste heat boiler is also installed between the waste heat boiler and the steam turbine.

[0016] As a preferred embodiment, a third pressure sensor for monitoring the outlet pressure of the water pump is also provided between the output end of the water pump and the heat exchanger. The outlet pressure of the water pump is monitored by the pressure sensor.

[0017] Compared with existing technologies, this utility model has significant advantages and beneficial effects. Specifically, as can be seen from the above technical solution, it mainly achieves this through the structural design and coordination between the heat exchanger, the regenerative heater, and the steam turbine. The flue gas output end of the waste heat boiler is connected to the input end of the heat exchanger; the output end of the feedwater pump is connected to the other input end of the heat exchanger; the output end of the heat exchanger is connected to one input end of the regenerative heater; the other output end of the steam turbine is connected to the input end of the regenerative heater via an extraction pipe; one output end of the regenerative heater is connected to a drain device; the other output end of the regenerative heater is connected to the input end of the economizer; and the output end of the economizer is connected to the other input end of the waste heat boiler. In this way, the waste heat from the flue gas of the waste heat boiler is used for preheating, increasing the initial temperature of the feedwater. The preheated feedwater enters the regenerative heater, and through two-stage heating, the feedwater temperature is significantly increased, enabling more efficient absorption of waste heat from the exhaust gas, reducing the exhaust gas emission temperature, reducing the heat load of the waste heat boiler, and improving the overall thermal efficiency of the system.

[0018] Secondly, the design of the condensate drain device is used to collect and drain the condensate in the regenerator, preventing the accumulation of condensate from affecting the heating efficiency.

[0019] To more clearly illustrate the structural features and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0020] Figure 1 This is a first flowchart illustrating an embodiment of the present utility model;

[0021] Figure 2 This is a second process diagram of an embodiment of the present utility model;

[0022] Figure 3 This is a third flowchart of an embodiment of the present utility model.

[0023] Explanation of reference numerals in the attached diagram:

[0024] 1. Waste heat boiler 2. Steam turbine

[0025] 3. Generator 4. Condenser

[0026] 5. Water supply pump 6. Water replenishment system

[0027] 7. Economizer 8. Heat Exchanger

[0028] 9. Regenerative heater 10. Drainage device

[0029] 101. Steam trap; 102. Steam trap box

[0030] 91. Low-pressure heater 92. Medium-pressure heater

[0031] 93. High-pressure heater

[0032] 11. First pressure sensor 12. Second pressure sensor

[0033] 13. Third pressure sensor 14. Temperature sensor

[0034] 16. Exhaust pipe 161. Low-pressure exhaust pipe

[0035] 162. Medium-pressure air extraction pipeline; 163. High-pressure air extraction pipeline

[0036] 17. Steam regulating valve. Detailed Implementation

[0037] Please refer to Figures 1 to 3 As shown, it illustrates the specific structure of an embodiment of the present invention.

[0038] In the description of this utility model, it should be noted that the directional terms such as "up", "down", "front", "back", "left", and "right" indicate the orientation and positional relationship based on the accompanying drawings or the orientation or positional relationship shown when wearing and using the device normally. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0039] A waste heat boiler 1 power generation system includes a waste heat boiler 1, a steam turbine 2, a generator 3, a condenser 4, a feedwater pump 5, a water heating device, and a water replenishment system 6.

[0040] The steam turbine 2 drives the generator 3 to generate electricity; one output end of the waste heat boiler 1 is connected to one input end of the steam turbine 2; one output end of the steam turbine 2 is connected to the input end of the condenser 4; the output end of the condenser 4 is connected to the input end of the feed water pump 5; wherein, the water replenishment system 6 is connected to the feed water pump 5 through another pipe.

[0041] The waste heat boiler 1 power generation system also includes an economizer 7, a heat exchanger 8, a regenerating heater 9, and a condensate drain device 10 for collecting and discharging condensate from the regenerating heater 9.

[0042] The flue gas output end of the waste heat boiler 1 is connected to the input end of the heat exchanger 8; the output end of the feed water pump 5 is connected to the other input end of the heat exchanger 8; preferably, a third pressure sensor 13 for monitoring the outlet pressure of the feed water pump 5 is also provided between the output end of the feed water pump 5 and the heat exchanger 8. The outlet pressure of the feed water pump 5 is monitored by the pressure sensor, and the speed of the feed water pump 5 can be adjusted by the frequency converter.

[0043] The output end of the heat exchanger 8 is connected to an input end of the regenerating heater 9; preferably, a temperature sensor 14 for monitoring the feed water temperature of the heat exchanger 8 and the regenerating heater 9 and a first pressure sensor 11 for monitoring the feed water pressure between the heat exchanger 8 and the regenerating heater 9 are respectively provided between the output end of the heat exchanger 8 and the regenerating heater 9.

[0044] The other output end of the steam turbine 2 is connected to the input end of the regenerator 9 through the extraction pipe 16; preferably, the extraction pipe of the steam turbine 2 is also provided with a steam regulating valve 17 for regulating the steam flow rate entering the regenerator 9.

[0045] One output end of the regenerating heater 9 is connected to the condensate drain device 10; the other output end of the regenerating heater 9 is connected to the input end of the economizer 7; preferably, the condensate drain device 10 includes a condensate tank 102 and a condensate drainer 101; the condensate tank 102 is used to temporarily store condensate; the condensate drainer 101 is used to automatically discharge condensate, and both the condensate tank 102 and the condensate drainer 101 are connected to the regenerating heater 9 through condensate drain pipes to prevent condensate accumulation from affecting heating efficiency.

[0046] Preferably, the regenerative heater 9 includes a low-pressure heater 91, a medium-pressure heater 92, and a high-pressure heater 93. The extraction pipe includes a low-pressure extraction pipe 161, a medium-pressure extraction pipe 162, and a high-pressure extraction pipe 163. The steam turbine 2 is connected to the low-pressure heater 91, the medium-pressure heater 92, and the high-pressure heater 93 through the low-pressure extraction pipe 161, the medium-pressure extraction pipe 162, and the high-pressure extraction pipe 163, respectively. The output end of the low-pressure heater 91 is connected to the input end of the medium-pressure heater 92, the output end of the medium-pressure heater 92 is connected to the input end of the high-pressure heater 93, and the output end of the high-pressure heater 93 is connected to the economizer 7. By connecting heaters of different pressure levels, the system can fully utilize the heat from the exhaust steam of the steam turbine 2, increase the feedwater temperature, reduce the heat load of the waste heat boiler 1, and thus improve the thermal efficiency of the system.

[0047] The regenerator 9 has a feedwater inlet, a steam inlet, a feedwater outlet, and a condensate outlet. The feedwater inlet is connected to the output end of the heat exchanger 8 and is used to receive preheated feedwater. The steam inlet is connected to the extraction steam pipe of the turbine 2 and is used to receive the heat from the exhaust steam of the turbine 2. The feedwater outlet is connected to the input end of the economizer 7 and is used to transport the heated feedwater to the economizer 7. The condensate outlet is connected to the condensate drain device 10 and is used to collect and discharge condensate.

[0048] The output of the economizer 7 is connected to the other input of the waste heat boiler 1. Preferably, a second pressure sensor 12 for monitoring the main steam pressure of the waste heat boiler 1 is also provided between the waste heat boiler 1 and the steam turbine 2.

[0049] In this embodiment, the feedwater process is as follows: feedwater flows out from the condenser 4 and enters the feedwater pump 5; after being pressurized by the feedwater pump 5, the feedwater enters the heat exchanger 8 for preheating; the preheated feedwater enters the regenerative heater 9, which uses the heat from the exhaust steam of the turbine 2 for further heating; the heated feedwater enters the economizer 7, which absorbs the waste heat of the exhaust gas to generate high-temperature and high-pressure steam; the high-temperature and high-pressure steam enters the waste heat boiler 1 to drive the turbine 2 to generate electricity.

[0050] Its steam process is as follows: high-temperature and high-pressure steam flows out from waste heat boiler 1 and enters steam turbine 2 to generate electricity; the exhaust steam from steam turbine 2 enters regenerator 9 through extraction steam pipe to heat feedwater.

[0051] The condensate drainage process is as follows: condensate flows out from the regenerator 9 and enters the condensate drain device 10; the condensate drain device 10 transports the condensate to the condenser 4 and re-enters the system circulation.

[0052] Furthermore, an external control system can be configured, and its pressure sensor and temperature sensor 14 can be electrically connected to the control system so that the status of each component can be observed in real time. The control system is a technology known in the art.

[0053] The key design feature of this invention lies in the structural design and coordination between the heat exchanger, the regenerative heater, and the steam turbine. The flue gas output of the waste heat boiler is connected to the input of the heat exchanger; the output of the feedwater pump is connected to another input of the heat exchanger; the output of the heat exchanger is connected to one input of the regenerative heater; the other output of the steam turbine is connected to the input of the regenerative heater via an extraction pipe; one output of the regenerative heater is connected to a drain device; the other output of the regenerative heater is connected to the input of the economizer; and the output of the economizer is connected to another input of the waste heat boiler. In this way, the waste heat from the flue gas of the waste heat boiler is used for preheating, increasing the initial temperature of the feedwater. The preheated feedwater enters the regenerative heater, and through two-stage heating, the feedwater temperature is significantly increased. This allows for more efficient absorption of waste heat from the exhaust gas, reducing the exhaust gas emission temperature, reducing the heat load on the waste heat boiler, and improving the overall thermal efficiency of the system.

[0054] Secondly, the design of the condensate drain device is used to collect and drain the condensate in the regenerator, preventing the accumulation of condensate from affecting the heating efficiency.

[0055] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A waste heat boiler power generation system, comprising a waste heat boiler, a steam turbine, a generator, a condenser, a feed water pump, a water heating device and a make-up water system; the steam turbine drives the generator to generate electricity; an output end of the waste heat boiler is connected to an input end of the steam turbine; an output end of the steam turbine is connected to an input end of the condenser; an output end of the condenser is connected to an input end of the feed water pump; wherein, The water supply system is connected to the water supply pump through another pipeline; characterized in that: The waste heat boiler power generation system further comprises a coal economizer, a heat exchanger, a regenerative heater and a drain device for collecting and discharging condensate water in the regenerative heater; The flue gas output end of the waste heat boiler is connected to the input end of the heat exchanger; the output end of the water supply pump is connected to another input end of the heat exchanger; the output end of the heat exchanger is connected to an input end of the regenerative heater; another output end of the steam turbine is connected to the input end of the regenerative heater through an extraction pipeline; an output end of the regenerative heater is connected to the drain device; another output end of the regenerative heater is connected to the input end of the coal economizer; the output end of the coal economizer is connected to another input end of the waste heat boiler.

2. The waste heat boiler power generation system of claim 1, wherein: The regenerative heater comprises a low-pressure heater, a medium-pressure heater and a high-pressure heater; the extraction pipeline comprises a low-pressure extraction pipeline, a medium-pressure extraction pipeline and a high-pressure extraction pipeline; the steam turbine is connected to the low-pressure heater, the medium-pressure heater and the high-pressure heater through the low-pressure extraction pipeline, the medium-pressure extraction pipeline and the high-pressure extraction pipeline, respectively; the output end of the low-pressure heater is connected to the input end of the medium-pressure heater; the output end of the medium-pressure heater is connected to the input end of the high-pressure heater; the output end of the high-pressure heater is connected to the coal economizer.

3. The waste heat boiler power generation system of claim 1, wherein: The drain device comprises a drain tank and a drain trap; the drain tank is used for temporarily storing condensate water; the drain trap is used for automatically discharging condensate water; the drain tank and the drain trap are both connected to the regenerative heater through a drain pipeline.

4. The waste heat boiler power generation system of claim 1, wherein: Temperature sensors for monitoring the feedwater temperature of the heat exchanger and the regenerative heater and a first pressure sensor for monitoring the feedwater pressure between the heat exchanger and the regenerative heater are further arranged between the output end of the heat exchanger and the regenerative heater.

5. The waste heat boiler power generation system of claim 1, wherein: A steam regulating valve for regulating the steam flow entering the regenerative heater is further arranged on the extraction pipeline of the steam turbine.

6. The waste heat boiler power generation system of claim 1, wherein: A second pressure sensor for monitoring the main steam pressure of the waste heat boiler is further arranged between the waste heat boiler and the steam turbine.

7. The waste heat boiler power generation system of claim 1, wherein: A third pressure sensor for monitoring the outlet pressure of the water supply pump is further arranged between the output end of the water supply pump and the heat exchanger.

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