A series pipeline connection structure for back pressure compressor and post-processor condensate pump

Abstract

This utility model discloses a series pipeline connection structure for a back-pressure turbine and a downstream condensate pump, relating to the field of mechanical engineering. In this pipeline connection structure, the downstream condenser, downstream condensate pump, vacuum deaerator, back-pressure turbine condensate pump, iron separator, and waste heat boiler are connected sequentially. Simultaneously, a downstream condensate pump shaft seal cooler is installed on the connection pipeline between the downstream condensate pump and the vacuum deaerator, and a back-pressure turbine shaft seal cooler is installed on the connection pipeline between the iron separator and the waste heat boiler, providing a stable condensate pump series system. This utility model forms a two-stage condensate delivery system through the series connection of two pumps, reducing the outlet pressure of each pump and the pressure of the corresponding pipeline system and equipment, thus reducing the requirements and costs for the condensate pumps. The use of two condensate pumps in each stage improves the system's ability to cope with single-point failures; even if one pump fails or requires maintenance, condensate circulation is maintained, ensuring continuous and stable system operation.

Description

Technical Field

[0001] This utility model relates to the field of mechanical engineering, specifically to a series pipeline connection structure for a condenser back-pressure turbine and a downstream condensate pump. Background Technology

[0002] In recent years, my country has successively constructed gas turbine generator units for combined heat and power (CHP). To maximize heat supply, the turbines were configured as back-pressure turbines. However, due to changes in industrial structure and market demand for heat, electricity supply remains tight. When heat supply is insufficient, the gas turbine operates under back-pressure turbine conditions to generate electricity, requiring the emission of steam. This results in economic losses and energy waste, as well as noise pollution affecting the lives of surrounding residents. To avoid the shutdown of back-pressure turbine generator units and address the electricity shortage, the back-pressure turbines are being modified into turbine generator units capable of both generating electricity and providing heat, utilizing the emitted steam to generate electricity and improving energy efficiency.

[0003] Existing technologies lack a direct way to recycle the condensate generated by the condenser of the rear-mounted steam turbine back to the boiler for heating and steam generation. For example, the "Methods for Solving Cogeneration, Split-Shaft Heating Steam Turbine Generator Sets and Operation Methods" disclosed in announcement number CN103883364A uses a back-pressure steam turbine and a rear-mounted steam turbine for cogeneration, but it does not mention how to treat or recycle the condensate collected in the condenser. Utility Model Content

[0004] The purpose of this invention is to provide a series connection structure for the back-pressure compressor and the condensate pump of the post-filter, enabling the condensate from the post-filter to be reused for generating high-temperature steam for power generation, thus achieving water recycling and working fluid recovery without generating additional pollution. Another purpose of this invention is to make the series connection structure for the back-pressure compressor and the condensate pump of the post-filter more reliable. With one condensate pump operating and one on standby, the system ensures that if one pump fails, the other can maintain the flow of condensate in the circulation pipeline, ensuring water and steam circulation. A further purpose of this invention is that the condensate pump of the post-filter can be a low-pressure pump. During normal operation, each pump has a relatively small load and low outlet pressure, allowing the use of pumps with lower pressure and load to complete the work, thus reducing costs.

[0005] This utility model achieves the above-mentioned technical objectives through the following technical means.

[0006] A series pipeline connection structure for a back-pressure turbine and a downstream condensate pump is disclosed. The downstream condenser is connected to at least one downstream condensate pump, the downstream condensate pump is connected to a downstream shaft seal cooler, the downstream condensate pump is directly connected to a vacuum deaerator, the downstream shaft seal cooler is connected to the vacuum deaerator, the vacuum deaerator is connected to at least one back-pressure turbine condensate pump, the back-pressure turbine condensate pump is connected to a magnetic separator, the magnetic separator is connected to the back-pressure turbine shaft seal cooler, the magnetic separator is directly connected to a waste heat boiler, and the back-pressure turbine shaft seal cooler is connected to the waste heat boiler.

[0007] Furthermore, the post-heater condenser is connected to the post-heater first condensate pump and the post-heater second condensate pump via the post-heater condensate pipeline.

[0008] Furthermore, the first condensate pump of the post-heater is connected to the post-heater shaft seal cooler pipeline through the post-heater shaft seal cooler inlet pipe, and the post-heater shaft seal cooler is connected to the vacuum deaerator pipeline through the post-heater shaft seal cooler outlet pipe.

[0009] Preferably, the first condensate pump of the post-processor is connected to the vacuum deaerator through the outlet pipe of the first condensate pump of the post-processor, and the second condensate pump of the post-processor is connected to the vacuum deaerator through the outlet pipe of the second condensate pump of the post-processor.

[0010] Furthermore, the vacuum deaerator is connected to the back pressure compressor's first condensate pump and second condensate pump via the back pressure compressor's condensate pipeline.

[0011] Furthermore, the first condensate pump of the back pressure unit is connected to the iron separator pipeline through the outlet pipe of the first condensate pump of the back pressure unit, and the second condensate pump of the back pressure unit is connected to the iron separator pipeline through the outlet pipe of the second condensate pump of the back pressure unit.

[0012] Furthermore, the iron remover is connected to the waste heat boiler pipeline via the boiler feedwater pipeline.

[0013] Furthermore, the iron remover is connected to the back pressure machine shaft seal cooler pipeline via the back pressure machine shaft seal cooler inlet pipe, and the back pressure machine shaft seal cooler is connected to the waste heat boiler pipeline via the back pressure machine shaft seal cooler outlet pipe.

[0014] Preferably, the first condensate pump and the second condensate pump of the post-processor are connected in parallel and serve as backups for each other.

[0015] Preferably, the first condensate pump and the second condensate pump of the back pressure unit are connected in parallel and serve as backups for each other.

[0016] This utility model has the following beneficial effects:

[0017] The parallel redundancy design of the two-stage pump sets enhances the condensate system's ability to cope with single-point failures, ensuring the continuous and stable operation of the entire power generation or combined heat and power system. It can maintain condensate circulation even if one pump fails or requires maintenance. Attached Figure Description

[0018] Figure 1 This invention relates to a pipeline connection structure.

[0019] Figure 2 This is another pipeline connection structure of this utility model.

[0020] In the diagram, 1-Post-processor condenser, 2-Post-processor first condensate pump, 3-Post-processor second condensate pump, 4-Post-processor shaft seal cooler, 5-Vacuum deaerator, 6-Back-pressure turbine first condensate pump, 7-Back-pressure turbine second condensate pump, 8-Iron separator, 9-Back-pressure turbine shaft seal cooler, 10-Waste heat boiler, 11-Post-processor condensate pipe, 12-Post-processor first condensate pump inlet pipe, 13-Post-processor first condensate pump outlet pipe, 14-Post-processor second condensate pump outlet pipe 15-Inlet pipe of the rear engine shaft seal cooler; 16-Outlet pipe of the rear engine shaft seal cooler; 17-Condensate pipe of the back pressure unit; 18-Inlet pipe of the first condensate pump of the back pressure unit; 19-Outlet pipe of the first condensate pump of the back pressure unit; 20-Outlet pipe of the second condensate pump of the back pressure unit; 21-Inlet pipe of the shaft seal cooler of the back pressure unit; 22-Boiler feed water pipe; 23-Outlet pipe of the shaft seal cooler of the back pressure unit; 24-Inlet pipe of the second condensate pump of the rear engine; 25-Inlet pipe of the second condensate pump of the back pressure unit. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0022] Example 1:

[0023] like Figure 1 As shown, a series pipeline connection structure for a back-pressure turbine and a downstream condensate pump is provided. The downstream condenser 1 is connected to at least one downstream condensate pump, the downstream condensate pump is connected to the downstream shaft seal cooler 4, and the downstream condensate pump is directly connected to a vacuum deaerator 5. The downstream shaft seal cooler is connected to the vacuum deaerator 5, the vacuum deaerator 5 is connected to at least one back-pressure turbine condensate pump, the back-pressure turbine condensate pump is connected to a magnetic separator 8, the magnetic separator 8 is connected to the back-pressure turbine shaft seal cooler 9, the magnetic separator 8 is directly connected to a waste heat boiler 10, and the back-pressure turbine shaft seal cooler 9 is connected to the waste heat boiler 10.

[0024] The condensate pump of the post-heater unit, through a pipeline system, transports the condensate from the post-heater unit condenser 1 to the vacuum deaerator 5. The condensate pump of the back-pressure unit, through the pipeline system, transports the condensate from the vacuum deaerator 5 to the waste heat boiler 10. This invention provides a highly efficient and stable condensate pump series system, enabling the steam discharged from the back-pressure unit to generate electricity through the post-heater unit.

[0025] The post-heater condenser 1 is split into a first condensate pump inlet pipe 12 and a second condensate pump inlet pipe 24 via a post-heater condensate pipe 11. The first condensate pump inlet pipe 12 and the second condensate pump inlet pipe 24 are respectively connected to the first condensate pump 2 and the second condensate pump 3 of the post-heater. The first condensate pump outlet pipe 13 connected to the first condensate pump 2 and the second condensate pump outlet pipe 14 connected to the second condensate pump 3 of the post-heater are combined and connected to the vacuum deaerator 5. A post-heater shaft seal cooler 4 is connected to the combined pipe of the first condensate pump outlet pipe 13 and the second condensate pump outlet pipe 14.

[0026] After the first condensate pump 2 and the second condensate pump 3 of the downstream unit are connected in parallel, both the first condensate pump 2 and the second condensate pump 3 are simultaneously connected to the downstream unit condenser. The first condensate pump 2 and the second condensate pump 3 of the downstream unit work simultaneously and serve as backups for each other. If the first condensate pump 2 or the second condensate pump 3 of the downstream unit fails, either the second condensate pump 3 or the first condensate pump 2 of the downstream unit can immediately take over the full load of the other condensate pump and continue to work.

[0027] By installing two condensate pumps, one or both pumps can be selected to operate during normal operation depending on the load. If either pump fails or requires maintenance, the other pump can seamlessly take over, ensuring continuous condensate delivery. This avoids the situation where only one pump is connected to the pipeline, and pump failure and replacement would shut down the entire condensate recovery system. To ensure that the failure or maintenance of a single pump does not affect the continued operation of the condensate recovery system, the first condensate pump 2 and the second condensate pump 3 of the post-filter are required to be able to individually handle at least the entire condensate flow rate.

[0028] The rear shaft seal cooler 4 is connected to the vacuum deaerator 5 through the rear shaft seal cooler inlet pipe 15 and the rear shaft seal cooler outlet pipe 16. Hot water is introduced into the rear shaft seal cooler 4 through the rear shaft seal cooler inlet pipe 15. The heated condensate flows through the rear shaft seal cooler outlet pipe 16 and merges with the condensate in the rear first condensate pump outlet pipe 13 and the rear second condensate pump outlet pipe 14.

[0029] The vacuum deaerator 5 is connected to the second condensate pump 7 of the back pressure machine via the condensate pipe 17 of the back pressure machine. The second condensate pump 7 of the back pressure machine is connected to the iron separator 8 via the outlet pipe 20 of the second condensate pump of the back pressure machine. The iron separator 8 is connected to the waste heat boiler 10 via the boiler feed water pipe 22.

[0030] The vacuum deaerator 5 is split into the back pressure condensate pipe 17 into the first condensate pump inlet pipe 18 and the second condensate pump inlet pipe 25. The first condensate pump inlet pipe 18 and the second condensate pump inlet pipe 25 are respectively connected to the first condensate pump 6 and the second condensate pump 7 of the back pressure machine. The first condensate pump outlet pipe 19 connected to the first condensate pump 6 and the second condensate pump outlet pipe 20 connected to the second condensate pump 7 are combined and then connected to the iron separator 8.

[0031] By installing two condensate pumps, under normal operating conditions, one or both pumps can be selected to operate depending on the load. If either pump fails or requires maintenance, the other pump can seamlessly take over, ensuring uninterrupted condensate delivery and improving system reliability and availability. Therefore, the load requirements for the first condensate pump 6 and the second condensate pump 7 of the back pressure unit are at least sufficient to individually handle the entire condensate flow.

[0032] The boiler feedwater pipeline 22 is equipped with a back pressure shaft seal cooler 9, which is connected to the back pressure shaft seal cooler inlet pipe 21 and the back pressure shaft seal cooler outlet pipe 23. Hot water is introduced into the back pressure shaft seal cooler 9 through the back pressure shaft seal cooler inlet pipe 21, and the back pressure shaft seal cooler outlet pipe 23 merges with the water in the boiler feedwater pipeline 22.

[0033] The first condensate pump 2 and the second condensate pump 3 of the post-heater are backups for each other and are set up in parallel. They can transport the condensate from the post-heater condenser 1 through the post-heater shaft seal cooler 4 to the vacuum deaerator 5.

[0034] The first condensate pump 6 and the second condensate pump 7 of the back pressure unit are backups for each other and are set up in parallel. The condensate from the back pressure unit can be transported from the vacuum deaerator 5 of the back pressure unit through the iron remover 8 and the shaft seal cooler 9 of the back pressure unit to the waste heat boiler 10.

[0035] The rear-mounted shaft seal cooler 4 and the back-pressure shaft seal cooler 9 can use the waste heat recovered from the cooling steam to heat the condensate, thereby improving energy utilization efficiency.

[0036] Iron separator 8 can purify condensate water and remove fine impurities such as metal fragments from the condensate water, meeting the water quality requirements of waste heat boiler 10.

[0037] Example 2:

[0038] like Figure 1 and Figure 2 As shown, a series pipeline connection structure for a back-pressure turbine and a downstream condensate pump is provided. The downstream condenser 1 is connected to at least one downstream condensate pump, the downstream condensate pump is connected to the downstream shaft seal cooler 4, and the downstream condensate pump is directly connected to a vacuum deaerator 5. The downstream shaft seal cooler is connected to the vacuum deaerator 5, the vacuum deaerator 5 is connected to at least one back-pressure turbine condensate pump, the back-pressure turbine condensate pump is connected to a magnetic separator 8, the magnetic separator 8 is connected to the back-pressure turbine shaft seal cooler 9, the magnetic separator 8 is directly connected to a waste heat boiler 10, and the back-pressure turbine shaft seal cooler 9 is connected to the waste heat boiler 10.

[0039] The condensate pump of the post-heater unit, through a pipeline system, transports the condensate from the post-heater unit condenser 1 to the vacuum deaerator 5. The condensate pump of the back-pressure unit, through the pipeline system, transports the condensate from the vacuum deaerator 5 to the waste heat boiler 10. This invention provides a highly efficient and stable condensate pump series system, enabling the steam discharged from the back-pressure unit to generate electricity through the post-heater unit.

[0040] The post-heater condenser 1 is connected to the post-heater second condensate pump 3 via the post-heater condensate pipe 11. The post-heater second condensate pump 3 is connected to the vacuum deaerator 5 via the post-heater second condensate pump outlet pipe 14. The post-heater first condensate pump 2 is connected to the vacuum deaerator 5 via the post-heater first condensate pump inlet pipe 12 and the post-heater first condensate pump outlet pipe 13. A post-heater shaft seal cooler 4 is connected to the combined pipe of the post-heater first condensate pump outlet pipe 13 and the post-heater second condensate pump outlet pipe 14.

[0041] After the pipelines of the first condensate pump 2 and the second condensate pump 3 of the post-processor are connected in parallel, the first condensate pump 2 and the second condensate pump 3 of the post-processor can be started simultaneously under normal operating conditions, so that the working pressure of a single condensate pump is maintained at a low level, and the first condensate pump 2 and the second condensate pump 3 of the post-processor can be used as backups for each other.

[0042] When either the first condensate pump 2 or the second condensate pump 3 of the post-processor fails, the second condensate pump 3 or the first condensate pump 2 of the post-processor can immediately take over the workload of the other faulty pump and continue to work for a period of time until the other condensate pump is repaired and can be put back into operation. This ensures that the condensate system can continue to work without a complete shutdown when a single condensate pump is shut down for maintenance.

[0043] The rear shaft seal cooler 4 is connected to the vacuum deaerator 5 through the rear shaft seal cooler inlet pipe 15 and the rear shaft seal cooler outlet pipe 16. Hot water is introduced into the rear shaft seal cooler 4 through the rear shaft seal cooler inlet pipe 15. The heated condensate flows through the rear shaft seal cooler outlet pipe 16 and merges with the condensate in the rear first condensate pump outlet pipe 13 and the rear second condensate pump outlet pipe 14.

[0044] The vacuum deaerator 5 is connected to the second condensate pump 7 of the back pressure machine via the condensate pipe 17 of the back pressure machine. The second condensate pump 7 of the back pressure machine is connected to the iron separator 8 via the outlet pipe 20 of the second condensate pump of the back pressure machine. The iron separator 8 is connected to the waste heat boiler 10 via the boiler feed water pipe 22.

[0045] The vacuum deaerator 5 is branched off from the back pressure condensate pipe 17 to the inlet pipe 18 of the first condensate pump and the inlet pipe 25 of the second condensate pump. The inlet pipe 18 and the inlet pipe 25 of the first condensate pump are connected to the first condensate pump 6 and the second condensate pump 7 of the back pressure condenser, respectively. The outlet pipe 19 of the first condensate pump and the outlet pipe 20 of the second condensate pump are combined and then connected to the iron separator 8.

[0046] The system is equipped with two or more condensate pumps. During normal operation, one or both pumps can be selected to operate depending on the load. If any pump fails or needs maintenance, the other pump can seamlessly take over, ensuring uninterrupted condensate delivery and improving system reliability. Therefore, the load requirements for the first condensate pump 6 and the second condensate pump 7 of the back pressure unit are at least sufficient to individually handle the entire condensate flow.

[0047] The boiler feedwater pipeline 22 is equipped with a back pressure shaft seal cooler 9, which is connected to the back pressure shaft seal cooler inlet pipe 21 and the back pressure shaft seal cooler outlet pipe 23. Hot water is introduced into the back pressure shaft seal cooler 9 through the back pressure shaft seal cooler inlet pipe 21, and the back pressure shaft seal cooler outlet pipe 23 merges with the water in the boiler feedwater pipeline 22.

[0048] The first condensate pump 2 and the second condensate pump 3 of the post-heater are backups for each other and are set up in parallel. They can transport the condensate from the post-heater condenser 1 through the post-heater shaft seal cooler 4 to the vacuum deaerator 5.

[0049] The first condensate pump 6 and the second condensate pump 7 of the back pressure unit are backups for each other and are set up in parallel. The condensate from the back pressure unit can be transported from the vacuum deaerator 5 of the back pressure unit through the iron remover 8 and the shaft seal cooler 9 of the back pressure unit to the waste heat boiler 10.

[0050] The rear-mounted shaft seal cooler 4 and the back-pressure shaft seal cooler 9 utilize the waste heat within the device to heat the condensate, thereby increasing the temperature of the condensate when it enters the boiler. Compared to heating and evaporating the lower-temperature condensate into high-temperature, high-pressure steam that can be used for power generation, less fuel is required, thus improving energy efficiency.

[0051] The back pressure separator 8 can purify condensate water and remove fine impurities such as metal fragments, meeting the water quality requirements of the waste heat boiler 10.

[0052] The first condensate pump 2 and the second condensate pump 3 of the post-filter are connected in series with the first condensate pump 6 and the second condensate pump 7 of the back-pressure compressor. When both pumps are running simultaneously, the load on both pumps is relatively small. This also reduces the outlet pressure of the post-filter and back-pressure compressor condensate pumps. By selecting low-pressure pumps, energy savings are achieved, and the use of condensate pumps with lower loads and pressures can also meet the requirements, thus reducing investment costs.

[0053] like Figure 2 As shown, for cost-saving purposes, in this embodiment, the backup water pump can be omitted, leaving only one pump. The pipeline connection becomes: the post-heater condenser 1 is connected to the post-heater first condensate pump inlet pipe 12 via the post-heater condensate pipe 11, which is connected to the post-heater first condensate pump 2. The post-heater first condensate pump outlet pipe 13 is connected to the vacuum deaerator 5. The post-heater shaft seal cooler 4 is connected to the vacuum deaerator 5 via the post-heater shaft seal cooler inlet pipe 15 and the post-heater condensate cooling outlet pipe 16. The vacuum deaerator 5 is connected to the back-pressure unit first condensate pump 6 via the back-pressure unit first condensate pump inlet pipe 18. The back-pressure unit first condensate pump 6 is connected to the iron separator 8 via the back-pressure unit first condensate pump outlet pipe 19. The iron separator 8 is connected to the waste heat boiler 10 via the boiler feedwater pipe 22. The back pressure machine shaft seal cooler 9 is connected to both ends of the boiler feedwater pipe 22 via the back pressure machine shaft seal cooler inlet pipe 21 and the back pressure machine shaft seal cooler outlet pipe 23.

[0054] and Figure 1 The piping structure is not limited to a maximum of two water pumps. In fact, a third or fourth water pump can be connected in parallel as needed. Furthermore, the number of condensate pumps in the post-filter and the number of condensate pumps in the back-pressure unit are not required to be the same. The number of condensate pumps in the post-filter can be more or less than that in the back-pressure unit, depending on the specific needs.

Claims

1. A structure for connecting a back pressure pump and a back end condensate pump in series, characterized in that, The post-heater condenser (1) is connected to at least one post-heater condensate pump, the post-heater condensate pump is connected to the post-heater shaft seal cooler (4), the post-heater condensate pump is directly connected to the vacuum deaerator (5), the post-heater shaft seal cooler is connected to the vacuum deaerator (5), the vacuum deaerator (5) is connected to at least one back-pressure condensate pump, the back-pressure condensate pump is connected to the iron separator (8), the iron separator (8) is connected to the back-pressure shaft seal cooler (9), the iron separator (8) is directly connected to the waste heat boiler (10), and the back-pressure shaft seal cooler (9) is connected to the waste heat boiler (10).

2. The back pressure and post machine condensate pump in-line connection structure according to claim 1, wherein, The post-heater condenser (1) is connected to the first post-heater condensate pump (2) and the second post-heater condensate pump (3) via the post-heater condensate pipe (11).

3. The back pressure and post machine condensate pump in-line connection structure according to claim 2, wherein, The first condensate pump (2) of the post-heater is connected to the post-heater shaft seal cooler (4) through the inlet pipe (15) of the post-heater shaft seal cooler, and the post-heater shaft seal cooler (4) is connected to the vacuum deaerator (5) through the outlet pipe (16) of the post-heater shaft seal cooler.

4. The back pressure and post machine condensate pump in-line connection structure according to claim 2, wherein, The first condensate pump (2) of the post-processor is connected to the vacuum deaerator (5) through the outlet pipe (13) of the first condensate pump of the post-processor, and the second condensate pump (3) of the post-processor is connected to the vacuum deaerator (5) through the outlet pipe (14) of the second condensate pump of the post-processor.

5. The back pressure and post machine condensate pump series connection structure according to claim 1 or 2 or 3 or 4, characterized in that, The vacuum deaerator (5) is connected to the first condensate pump (6) and the second condensate pump (7) of the back pressure machine via the back pressure machine condensate pipe (17).

6. The back pressure and post machine condensate pump in-line connection structure according to claim 5, wherein, The first condensate pump (6) of the back pressure machine is connected to the iron separator (8) through the outlet pipe (19) of the first condensate pump of the back pressure machine, and the second condensate pump (7) of the back pressure machine is connected to the iron separator (8) through the outlet pipe (20) of the second condensate pump of the back pressure machine.

7. A series pipeline connection structure for a back-pressure unit and a post-heater condensate pump according to claim 1, 2, 3, 4, or 6, characterized in that, The iron remover (8) is connected to the waste heat boiler (10) via the boiler feed water pipe (22).

8. The back pressure and post machine condensate pump tandem piping connection structure according to claim 1 or 2 or 3 or 4 or 6, characterized in that, The iron remover (8) is connected to the back pressure machine shaft seal cooler (9) via the back pressure machine shaft seal cooler inlet pipe (21), and the back pressure machine shaft seal cooler (9) is connected to the waste heat boiler (10) via the back pressure machine shaft seal cooler outlet pipe (23).

9. The back pressure and post machine condensate pump in-line connection structure according to claim 2 or 3 or 4, characterized in that, The first condensate pump (2) and the second condensate pump (3) of the post-processor are connected in parallel and serve as backups for each other.

10. The back pressure and post machine condensate pump in-line connection structure according to claim 5, wherein, The first condensate pump (6) and the second condensate pump (7) of the back pressure machine are connected in parallel and serve as backups for each other.

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