CN214501187U - Low pressure heater drainage pump unit recirculation system - Google Patents
Low pressure heater drainage pump unit recirculation system Download PDFInfo
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- CN214501187U CN214501187U CN202120101780.4U CN202120101780U CN214501187U CN 214501187 U CN214501187 U CN 214501187U CN 202120101780 U CN202120101780 U CN 202120101780U CN 214501187 U CN214501187 U CN 214501187U
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Abstract
The utility model relates to the technical field of energy recovery and utilization, and discloses a low-pressure heater drainage pump unit recirculation system, which comprises a low-pressure heater, a front drainage main pipe and a rear drainage main pipe, wherein the tail end of the front drainage main pipe is divided into a first drainage branch and a second drainage branch which are connected in parallel and then connected with the rear drainage main pipe; the recycling system also comprises a recycling pipeline, a first recycling branch and a second recycling branch connected with the second water drainage branch, the first recycling branch is connected with the first water drainage branch, and the first recycling branch and the second recycling branch are connected in parallel with the recycling pipeline; the first drainage branch is provided with a first drainage pump, the second drainage branch is provided with a second drainage pump, and the first drainage branch, the second drainage branch, the first circulation branch and the second circulation branch are provided with check valves. The utility model is used for prevent that drainage pump outlet side medium and condensate pipe's medium from passing through recirculation line and flowing backwards to low pressure feed water heater in.
Description
Technical Field
The utility model relates to an energy recuperation utilizes technical field, especially relates to a low pressure feed water heater drainage pump unit recirculation system.
Background
The pressure difference between the last low-pressure heaters of the last stages of the conventional ultra-supercritical unit is reduced, so that normal drainage cannot automatically flow step by step, and drainage waste heat is wasted and cannot be recycled if the normal drainage directly flows into a condenser. Usually, a low-pressure heater drainage pump is additionally arranged behind a penultimate low-pressure heater (for example, a No. 6 low-pressure heater), so that the drainage heat can be recovered, the heat consumption rate of a unit is reduced, and the economy of the unit is improved. The drainage of the conventional No. 5 low-pressure heater flows to the No. 6 low-pressure heater automatically, 2 mutually standby low-pressure heater drainage pumps with 100% capacity are arranged at the outlet of the No. 6 low-pressure heater drainage pipeline, and the drainage of the former two-stage low-pressure heater is led to the outlet condensate pipeline of the No. 6 low-pressure heater. Each unit is generally provided with 2 low pressure drainage pumps, one is operated and the other is equipped, and the units can be simultaneously operated under the working conditions of No. 7 and No. 8 low pressure drainage pumps and full cutting pumps. In order to ensure that the flow rate flowing through the pump is larger than the minimum flow rate allowed by the pump under the starting and low-load working conditions of the unit and prevent the steam turbine from cavitation, the low-pressure heater steam turbine needs to be provided with a recirculation system.
As shown in fig. 1, in a recirculation system of a low-pressure heater drain pump unit in the prior art, two drain pumps, namely a first drain pump 2 and a second drain pump 3, which are standby and connected in parallel are generally provided, a valve is arranged at an outlet of each drain pump, and then two pump sets are combined into a single condensed water pipeline from a drain main pipe 4 to an outlet of the low-pressure heater. And a recycling pipeline 5 is connected to the rear drainage main pipe which is formed by combining the two pump sets into one pump, and returns to the low-pressure heater 1. When the first drainage pump 2 is normally operated and the second drainage pump 3 is ready to be started, the valve on the recirculation pipeline 5 is opened when receiving a signal, and in addition, the valves of the condensation water pipe after the main pipe on the outlet side of the pump is led to the low-pressure heater 1 are also all opened, so that the drainage and condensation water removal system and the pump group recirculation system which are normally operated conflict and interfere, and the recirculation pipeline 5 on the drainage main pipe 4 which is directly led through by the first drainage pump 2 which is normally operated is possibly led into the low-pressure heater 1. In addition, in the debugging process, because the valve on the recirculation pipeline 5 is not closed, the condensed water flows back to the steam side of the low-pressure heater through the rear drainage main pipe 4, and the accident of the action of the safety valve at the steam side of the low-pressure heater can be caused.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: how to prevent the medium at the outlet side of the drain pump and the medium of the condensed water pipeline from flowing back to the low-pressure heater through the recirculation pipeline.
In order to solve the technical problem, the utility model provides a low pressure heater drainage pump unit recirculation system, it includes low pressure heater, preceding drainage female pipe and back drainage female pipe, the top of preceding drainage female pipe with low pressure heater is connected, the end of preceding drainage female pipe divides into parallelly connected first drainage branch road and second drainage branch road, the end of first drainage branch road and the end of second drainage branch road join after connecting in the top of back drainage female pipe;
the recycling system also comprises a recycling pipeline, a first recycling branch and a second recycling branch connected with the second water drainage branch, the first recycling branch is connected with the first water drainage branch, the first recycling branch and the second recycling branch are connected to one end of the recycling pipeline in parallel, and the other end of the recycling pipeline is connected with the low-pressure heater;
the first drainage branch is provided with a first drainage pump, the second drainage branch is provided with a second drainage pump, the first drainage branch is located on the downstream side of the first drainage pump, the second drainage branch is located on the downstream side of the second drainage pump, the first circulation branch is provided with a check valve, and the second circulation branch is provided with a check valve.
Furthermore, first drainage branch is located on the way the upstream side of first drainage pump is equipped with manual gate valve and filter screen, first drainage branch is located on the way the downstream side of first drainage pump is equipped with electric gate valve.
Furthermore, the second drainage branch is located on the upstream side of the second drainage pump and is provided with a manual gate valve and a filter screen, and the second drainage branch is located on the downstream side of the second drainage pump and is provided with an electric gate valve.
Furthermore, an electric gate valve is arranged on the first circulation branch.
Furthermore, an electric gate valve is arranged on the second circulation branch.
Furthermore, a pneumatic regulating valve and a manual gate valve are arranged on the recirculation pipeline.
Furthermore, a pneumatic control valve, a flow meter and two manual gate valves are arranged on the rear drainage main pipe, and the pneumatic control valve is located between the two manual gate valves.
Further, the first circulation branch is connected to a downstream side of the first drain pump, and the second circulation branch is connected to a downstream side of the second drain pump.
Compared with the prior art, the recycling system of the low-pressure heater drain pump unit has the advantages that: a front drainage main pipe is led out from a steam side drainage end outlet of the low-pressure heater, the tail end of the front drainage main pipe is divided into a first drainage branch and a second drainage branch, the two drainage branches are respectively connected with a circulation branch, namely a first circulation branch and a second circulation branch, the rear drainage main pipe is communicated with a condensed water pipeline at the outlet of the low-pressure heater, and the first circulation branch and the second circulation branch are connected in parallel and are connected with the steam side of the low-pressure heater through a recirculation pipeline; the check valves on the first drainage branch and the second drainage branch can prevent media from flowing backwards, so that on one hand, the check valves are used for preventing the media at the outlet of other drainage pumps from flowing backwards, and on the other hand, the check valves are used for preventing the media in the condensed water pipeline from flowing backwards to the steam side of the low-pressure heater through the rear drainage main pipe; the check valve on the first circulation branch is used for preventing the medium of the second circulation branch from flowing back to enter the first circulation branch, and similarly, the check valve on the second circulation branch is used for preventing the medium of the first circulation branch from flowing back to enter the second circulation branch; therefore, the technical scheme can prevent the medium at the outlet side of the drain pump and the medium of the condensed water pipeline from flowing back to the low-pressure heater through the recirculation pipeline.
Drawings
FIG. 1 is a schematic diagram of a prior art low pressure heater hydrophobic pump assembly recirculation system;
fig. 2 is a schematic structural diagram of a recirculation system of a low-pressure heater drain pump unit according to an embodiment of the present invention.
The system comprises a low-pressure heater 1, a first drain pump 2, a second drain pump 3, a rear drain main pipe 4, a recirculation pipeline 5, a front drain main pipe 6, a first drain branch 7, a second drain branch 8, a first circulation branch 9, a second circulation branch 10, a check valve 11, a manual gate valve 12, a filter screen 13, an electric gate valve 14, a pneumatic regulating valve 15 and a flowmeter 16.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, which indicate the orientation or positional relationship, are used in the present invention as being based on the orientation or positional relationship shown in the drawings, and are used only for convenience of description and simplification of the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 2, an embodiment of the present invention provides a low pressure heater 1 drainage pump unit recirculation system, which includes a low pressure heater 1, a front drainage main pipe 6 and a rear drainage main pipe 4, a start end of the front drainage main pipe 6 is connected to the low pressure heater 1, a tail end of the front drainage main pipe 6 is divided into a first drainage branch 7 and a second drainage branch 8 which are connected in parallel, and a tail end of the first drainage branch 7 and a tail end of the second drainage branch 8 are joined and then connected to a start end of the rear drainage main pipe 4; the recycling system further comprises a recycling pipeline 5, a first recycling branch 9 and a second recycling branch 10 connected with the second water drainage branch 8, the first recycling branch 9 is connected with the first water drainage branch 7, the first recycling branch 9 and the second recycling branch 10 are connected to one end of the recycling pipeline 5 in parallel, and the other end of the recycling pipeline 5 is connected with the low-pressure heater 1; be equipped with first hydrophobic pump 2 on the first hydrophobic branch road 7, be equipped with second hydrophobic pump 3 on the second hydrophobic branch road 8, on the first hydrophobic branch road 7 and be located the downstream side of first hydrophobic pump 2, on the second hydrophobic branch road 8 and be located the downstream side of second hydrophobic pump 3, on the first circulation branch road 9 and all be equipped with check valve 11 on the second circulation branch road 10.
Based on the scheme, a front drainage main pipe 6 is led out from an outlet of a steam side drainage end of the low-pressure heater 1, the tail end of the front drainage main pipe 6 is divided into a first drainage branch 7 and a second drainage branch 8, the two drainage branches are respectively connected with a circulation branch, namely a first circulation branch 9 and a second circulation branch 10, a rear drainage main pipe 4 is communicated with a condensed water pipeline at the outlet of the low-pressure heater 1, and the first circulation branch 9 and the second circulation branch 10 are connected in parallel and are connected with the steam side of the low-pressure heater 1 through a recirculation pipeline 5; the check valves 11 on the first water drainage branch 7 and the second water drainage branch 8 can prevent media from flowing backwards, so that on one hand, the media at the outlet of other water drainage pumps can be prevented from flowing backwards, and on the other hand, the media in a condensed water pipeline can be prevented from flowing backwards to the steam side of the low-pressure heater 1 through the rear water drainage main pipe 4; the check valve 11 on the first circulation branch 9 is used for preventing the medium of the second circulation branch 10 from flowing back into the first circulation branch 9, and similarly, the check valve 11 on the second circulation branch 10 is used for preventing the medium of the first circulation branch 9 from flowing back into the second circulation branch 10; therefore, the technical scheme can prevent the medium on the outlet side of the drain pump and the medium of the condensed water pipeline from flowing back to the low-pressure heater 1 through the recirculation pipeline 5.
As shown in fig. 2, in this embodiment, a first circulation branch 9 is connected to the downstream side of the first drain pump 2, a second circulation branch 10 is connected to the downstream side of the second drain pump 3, a manual gate valve 12 and a strainer 13 are provided on the first drain branch 7 on the upstream side of the first drain pump 2, and an electric gate valve 14 is provided on the first drain branch 7 on the downstream side of the first drain pump 2; a manual gate valve 12 and a filter screen 13 are arranged on the upstream side of the second drainage branch 8 positioned on the second drainage pump 3, and an electric gate valve 14 is arranged on the downstream side of the second drainage branch 8 positioned on the second drainage pump 3. Wherein, the electric gate valve 14 is used for isolating pipelines of the outlets of the two hydrophobic pumps; the start and stop of the drainage pump can be manually operated in a control room and controlled by a low water level controller. When the operating pump is tripped due to faults or the outlet pressure is reduced to a setting value, the standby pump is automatically started to be put into operation. The function of the screen 13 is to filter hydrophobic impurities in order to prevent them from damaging the pump body.
As shown in fig. 2, in this embodiment, an electric gate valve 14 is disposed on the first circulation branch 9, an electric gate valve 14 is also disposed on the second circulation branch 10, and the electric gate valve 14 is used to control the circulation of the low pressure vacuum pump to ensure that the minimum flow rate allowed by the vacuum pump passes through the vacuum pump, thereby preventing cavitation of the vacuum pump.
In the present embodiment, as shown in fig. 2, a pneumatic control valve 15 and a manual gate valve 12 are provided on the recirculation line 5, and the pneumatic control valve 15 is used to adjust the pressure difference between the steam side of the low pressure heater 1 and the steam side after the drain pump.
As shown in fig. 2, in this embodiment, the rear drain header 4 is provided with a pneumatic control valve 15, a flow meter 16 and two manual gate valves 12, and the pneumatic control valve 15 is located between the two manual gate valves 12. Wherein, the flowmeter 16 is used for measuring the flow of the condensate pipeline from the drainage of the main pipe behind the drainage pump to the low-pressure heater 1; the pneumatic control valve 15 is used to regulate the low plus normal water level and should be opened when the air supply is lost. In addition, other gate valves are used for isolated maintenance in this embodiment.
To sum up, the embodiment of the utility model provides a pair of 1 hydrophobic pump unit recirculation system of low pressure feed water heater sets up 2 low of 100% capacity with hydrophobic pump (one fortune is equipped with) at 1 vapour side hydrophobic end of low pressure feed water heater, will hang down the hydrophobic pipeline that causes this level low to add the export through hydrophobic pump before adding. An independent recirculation system is arranged in front of each low-pressure drain pump outlet check valve 11, and the operation or starting of the two pumps are not interfered with each other. The branch pipes are respectively led out of the front of each low-pressure drain pump outlet check valve 11 and connected with a recirculation pipeline, and are converged into a main pipe after sequentially passing through an electric gate valve 14 and a check valve 11, and a pneumatic regulating valve 15 and a manual gate valve 12 are sequentially arranged on the main pipe and return to the steam side of the low-pressure heater 1.
Taking No. 6 low pressure heater as an example, the system is provided with two 100% capacity low pressure heater drainage pumps, one is operated, and the other is standby, so that the drainage collected to No. 6 low pressure heater is pumped into a condensate system, the heat consumption rate of the unit is reduced, and the heat efficiency of the unit is improved. In addition, the drainage can be put into operation simultaneously when the drainage quantity is increased under the working conditions of No. 7 and No. 8 low pressure and full pressure. The system is suitable for the 2x 100% capacity low-pressure and low-pressure hydrophobic pump configuration, and can also be expanded to 3x 50% capacity low-pressure and low-pressure hydrophobic pump configuration, 4x 35% capacity low-pressure and low-pressure hydrophobic pump configuration and the like.
The utility model discloses 1 hydrophobic pump unit recirculation system of low pressure feed water heater still has following beneficial effect: each low-pressure drain pump is provided with an independent recirculation system, and the operation or the starting is not influenced by the other pump; the risk of the condensate pipe flowing back into the low-pressure heater 1 through the recirculation pipe is relatively low.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.
Claims (8)
1. The recycling system of the low-pressure heater drainage pump unit is characterized by comprising a low-pressure heater, a front drainage main pipe and a rear drainage main pipe, wherein the starting end of the front drainage main pipe is connected with the low-pressure heater, the tail end of the front drainage main pipe is divided into a first drainage branch and a second drainage branch which are connected in parallel, and the tail end of the first drainage branch and the tail end of the second drainage branch are converged and then connected to the starting end of the rear drainage main pipe;
the recycling system also comprises a recycling pipeline, a first recycling branch and a second recycling branch connected with the second water drainage branch, the first recycling branch is connected with the first water drainage branch, the first recycling branch and the second recycling branch are connected to one end of the recycling pipeline in parallel, and the other end of the recycling pipeline is connected with the low-pressure heater;
the first drainage branch is provided with a first drainage pump, the second drainage branch is provided with a second drainage pump, the first drainage branch is located on the downstream side of the first drainage pump, the second drainage branch is located on the downstream side of the second drainage pump, the first circulation branch is provided with a check valve, and the second circulation branch is provided with a check valve.
2. The recirculation system of claim 1, wherein a manual gate valve and a screen are provided on the first drain branch upstream of the first drain pump, and a motorized gate valve is provided on the first drain branch downstream of the first drain pump.
3. The recirculation system of claim 1, wherein a manual gate valve and a screen are provided on the second drain branch upstream of the second drain pump, and a motorized gate valve is provided on the second drain branch downstream of the second drain pump.
4. The recirculation system of claim 1, wherein a powered gate valve is provided on the first circulation branch.
5. The recycling system of claim 1, wherein the second branch is provided with a power gate valve.
6. The recirculation system of claim 1, wherein a pneumatic control valve and a manual gate valve are provided on the recirculation line.
7. The recycling system of claim 1, wherein the rear drain header is provided with a pneumatic control valve, a flow meter and two manual gate valves, and the pneumatic control valve is located between the two manual gate valves.
8. The recirculation system of claim 1, wherein the first circulation branch is connected to a downstream side of the first hydrophobic pump and the second circulation branch is connected to a downstream side of the second hydrophobic pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120101780.4U CN214501187U (en) | 2021-01-14 | 2021-01-14 | Low pressure heater drainage pump unit recirculation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120101780.4U CN214501187U (en) | 2021-01-14 | 2021-01-14 | Low pressure heater drainage pump unit recirculation system |
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| Publication Number | Publication Date |
|---|---|
| CN214501187U true CN214501187U (en) | 2021-10-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120101780.4U Active CN214501187U (en) | 2021-01-14 | 2021-01-14 | Low pressure heater drainage pump unit recirculation system |
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| CN (1) | CN214501187U (en) |
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2021
- 2021-01-14 CN CN202120101780.4U patent/CN214501187U/en active Active
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Effective date of registration: 20220106 Address after: 510000 No.1 Tianfeng Road, Guangzhou Science City, Huangpu District, Guangzhou City, Guangdong Province Patentee after: CHINA ENERGY ENGINEERING GROUP GUANGDONG ELECTRIC POWER DESIGN INSTITUTE Co.,Ltd. Patentee after: Guangdong Tian'an Project Management Co., Ltd Address before: 510000 No.1 Tianfeng Road, Guangzhou Science City, Huangpu District, Guangzhou City, Guangdong Province Patentee before: CHINA ENERGY ENGINEERING GROUP GUANGDONG ELECTRIC POWER DESIGN INSTITUTE Co.,Ltd. |