CN212614904U - Coaxial constant-speed water supply pump system - Google Patents
Coaxial constant-speed water supply pump system Download PDFInfo
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- CN212614904U CN212614904U CN202021029052.9U CN202021029052U CN212614904U CN 212614904 U CN212614904 U CN 212614904U CN 202021029052 U CN202021029052 U CN 202021029052U CN 212614904 U CN212614904 U CN 212614904U
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Abstract
The utility model discloses a coaxial constant speed water-feeding pump system, steam turbine, generator, connecting device and constant speed water-feeding pump including coaxial arranging still include valve and reserve electronic water-feeding pump, steam turbine, generator are arranged one side of connecting device, the constant speed water-feeding pump is arranged connecting device's opposite side, reserve electronic water-feeding pump with the constant speed water-feeding pump arranges side by side. In the unit starting and turbine running stage, the water supply flow and pressure are controlled by the standby electric water supply pump; after the turbo generator set is connected to the grid, the constant-speed water feeding pump driven by the steam turbine is switched to deliver high-pressure water feeding to the boiler, so that the generator loss, the transformer loss and the loss of the motor of the electric water feeding pump in the power supply input link of the electric water feeding pump which is configured conventionally are eliminated, the energy conversion efficiency of the water feeding pump is greatly improved, and the purposes of saving energy and reducing consumption are achieved.
Description
Technical Field
The utility model relates to a coaxial constant speed arranges water-feeding pump system belongs to the thermal power generation field.
Background
At present, large and medium-sized enterprises such as chemical industry, oil refining need a large amount of reliable and stable steam to be used for the production line because production needs, consequently, all are equipped with small-size thermoelectric generator group for guarantee hot steam stable supply. The stable and continuous operation of the small thermoelectric generator set is a very important consideration, because once the steam fluctuates or is interrupted, the normal production plan of large and medium-sized enterprises such as chemical engineering, oil refining and the like can be seriously influenced, so that not only is the economic loss of the enterprises caused, but also the social influence of pulling the whole body can be caused. Therefore, the thermoelectric power unit is characterized in that: the heat supply and steam extraction amount is large and stable, and the unit load is stable. However, at present, the small heating units are basically provided with an electric feed water pump for delivering high-pressure feed water to the boiler. The electric energy of the motor of the electric water feeding pump mainly passes through three major links of a steam turbine generator, a station transformer and a motor, and the electric energy has certain loss through the devices, wherein the efficiency of the motor of the electric water feeding pump is lower, particularly products in the nineties, the efficiency is even lower than 85%, the loss of the electric energy input process is too much, the energy utilization efficiency is very low, the system is complex, the control requirement is high, and the normal operation of the electric water feeding pump or even a unit can be influenced by the fault of any electric device in the middle link.
The large number of thermoelectric units mainly comprise back-pressure turbines and extraction condensing turbines, which are used for improving the fuel utilization rate and improving the economical efficiency.
Consider that above-mentioned thermoelectric unit load is very stable, and the change is less, and water feed flow and pressure do not need the adjustment basically, for this reason, the utility model discloses a development a coaxial constant speed water-feeding pump's configuration system and method improves water-feeding pump energy utilization efficiency, simplifies control system, improves operational reliability.
Disclosure of Invention
In order to achieve the above object, the utility model provides a coaxial constant speed water-feeding pump system, including steam turbine, generator, connecting device, valve and reserve electronic water-feeding pump, its characterized in that still includes at least one constant speed water-feeding pump, the steam turbine the generator connecting device with the constant speed water-feeding pump is coaxial arranging, the steam turbine the generator is arranged one side of connecting device, the constant speed water-feeding pump arranges connecting device's opposite side, reserve electronic water-feeding pump with the constant speed water-feeding pump arranges side by side.
Preferably, the steam turbine may be divided into two cylinders, which are a high pressure cylinder and a low pressure cylinder or a high intermediate pressure cylinder and a low pressure cylinder.
Preferably, the connection device is arranged at the generator tail.
Preferably, the connection device is arranged at the head of the steam turbine.
Preferably, the valves are arranged on the water inlet end and the water outlet end of the constant-speed water feeding pump and the water inlet end and the water outlet end pipelines of the standby electric water feeding pump, and a check valve is arranged in front of the constant-speed water feeding pump and the water outlet end pipeline valves of the standby electric water feeding pump.
Preferably, the constant-speed water feeding pumps are configured with corresponding power and number according to unit capacity.
Preferably, the coupling device is a clutch.
Preferably, the connecting device is a coupling.
Preferably, the turbine is of the extraction condensing type or of the back pressure type.
It should be noted that, a unit with a larger capacity may be configured with one high-power water feeding pump or two low-power water feeding pumps, and various arrangement and combination modes according to different forms of turbines and connecting devices, the number of constant-speed water feeding pumps, and the like, and any different arrangement and combination modes based on the above-mentioned equipment should be within the protection scope determined by the claims.
The use of the foregoing system is as follows.
(1) If the connecting device is a clutch: and in the starting stage of the unit and the turbine running stage, opening pipeline valves at the water inlet end and the water outlet end of the constant-speed water feeding pump and the standby electric water feeding pump, disconnecting the connecting device, and controlling the water feeding flow and the water feeding pressure through the standby electric water feeding pump.
And after the turbo generator set is connected to the grid, the connecting device is connected, the standby electric water-feeding pump is gradually stopped, and the constant-speed water-feeding pump driven by the steam turbine delivers high-pressure water to the boiler.
(2) If the connecting device is a coupler: and in the starting stage of the unit and the turbine running stage, opening pipeline valves at the water inlet end and the water outlet end of the constant-speed water feeding pump and the standby electric water feeding pump, wherein the constant-speed water feeding pump ensures the safety through a recirculation system, and the standby electric water feeding pump controls the water feeding flow and the pressure.
And after the turbo generator set is connected to the grid, gradually stopping the constant-speed water feed pump recirculation system and the standby electric water feed pump, and conveying high-pressure feed water to the boiler by the constant-speed water feed pump driven by the steam turbine.
The connecting device can realize the cutting or connecting function no matter a clutch or a coupler is adopted, the clutch can realize the cutting or connecting of the online operation of the constant-speed water feeding pump, and the coupler needs to cut or connect the constant-speed water feeding pump at the shutdown stage of the unit.
The configuration system and method of the coaxial constant-speed water feeding pump can obtain the following technical effects.
1. The constant-speed water feeding pump which is coaxially arranged is directly driven by the steam turbine, so that the loss of a conventional electric water feeding pump power supply through a generator, a service transformer and a water feeding pump motor is eliminated, and the energy utilization efficiency is greatly improved.
2. The influence that electric equipment faults such as a generator, an auxiliary transformer, a water feeding pump motor and the like in the middle link possibly cause on the normal operation of the water feeding pump and the unit is eliminated, and the operation safety and reliability of the water feeding pump are greatly improved.
3. The power supply control system of the original electric water feeding pump is cancelled and is directly driven by the steam turbine, and the control is simple. The small load change of the unit during the start-up load rise, the stop load fall and the normal operation is adjusted by the outlet adjusting valve of the constant-speed water feeding pump, so that the full-load normal operation of the unit is realized.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings, so as to fully understand the objects, the features and the effects of the present invention.
Drawings
Fig. 1 is a schematic diagram of a system that does not employ the present invention.
Fig. 2 is a system diagram of the first embodiment.
Fig. 3 is a schematic system diagram of the second embodiment.
FIG. 4 is a schematic diagram of the system according to the third embodiment.
FIG. 5 is a schematic diagram of a system according to a fourth embodiment.
FIG. 6 is a schematic system diagram of the fifth embodiment.
Fig. 7 is a system diagram of the sixth embodiment.
The labels in the figure are: 1-a steam turbine; 2-a generator; 3-electric feed water pump; 4, a motor; 5, a valve; 6, a check valve; 7-connecting means; 8-constant speed water supply pump; 9-high pressure cylinder; 10-low pressure cylinder; 11-high and medium pressure cylinder.
Detailed Description
The first embodiment.
Fig. 2 shows a first embodiment of a system and a method for configuring a coaxial constant-speed feed pump according to the present invention. The system mainly comprises a steam turbine 1, a generator 2, a constant-speed water feeding pump 8, a connecting device 7, a valve 5, a check valve 6 and a standby electric water feeding pump 3 which are coaxially connected.
The control mode of the constant-speed feed water pump is as follows:
1. when the connecting device 7 selects a clutch, the switching of the constant-speed water feeding pump 8 is flexible, online switching can be realized, but the manufacturing cost is relatively high, and the reliability of the clutch can influence the safety of the whole system.
The switching control mode of the constant-speed water supply pump 8 is as follows:
and in the unit starting stage and the turbine running stage, opening pipeline valves 5 at the water inlet end and the water outlet end of the constant-speed water feeding pump and the standby electric water feeding pump, disconnecting the connecting device 7, and controlling the water feeding flow and pressure through the standby electric water feeding pump 3.
After the turbo generator set is connected to the grid, the connecting device 7 is connected, the standby electric water-feeding pump 3 is gradually stopped, and the constant-speed water-feeding pump 8 driven by the steam turbine 1 delivers high-pressure water to the boiler.
The energy saving benefit calculation analysis of the embodiment is as follows:
taking a certain 50MW self-contained thermoelectric unit in China as an example, in the early nineties, an electric water supply pump is configured to control water supply flow and pressure, the shaft power of the water supply pump is 1722kW, 1 water supply pump in normal operation can meet the water supply requirement of a single unit, the motor efficiency of the water supply pump is very low and is only 80%, the generator efficiency is 98%, the transformer efficiency is 98%, after comprehensive calculation, the utilization efficiency of the electric energy by the water supply pump is 76.8%, and the economical efficiency is very poor.
After being driven by the steam turbine, eliminated the loss of generator, transformer and feed pump motor, conversion efficiency 100%, the station service power consumption is practiced thrift 1722kW/76.8% -1722kW =520.2kW, calculates according to operation hours 7200h, annual saving 520.2kW 7200h =374.5 ten thousand degrees electricity, and the net electric charge of buying on the net is 0.54 yuan/degree electricity, and single unit can practice thrift 202 ten thousand yuan, implements the utility model discloses a benefit is showing.
2. When the connecting device 7 selects a coupler, the manufacturing cost is relatively low, the safety is high, but the switching of the constant-speed water feeding pump 8 cannot be realized in the running of the unit, and the switching can only be operated after the unit is stopped, so that the switching is not flexible enough.
The switching control mode of the constant-speed water supply pump 8 is as follows:
and in the unit starting stage and the turbine running stage, the constant-speed water feeding pump 8 and the standby electric water feeding pump 3 are opened, the water inlet end and water outlet end pipeline valves 5 are opened, the constant-speed water feeding pump 8 ensures safety through a recirculation system, and the water feeding flow and pressure are controlled through the standby electric water feeding pump 3.
After the turbo generator set is connected to the grid, the constant speed feed water pump 8 recirculation system and the standby electric feed water pump 3 are gradually stopped, and the constant speed feed water pump 8 driven by the steam turbine delivers high-pressure feed water to the boiler.
Example two.
Fig. 3 shows a second embodiment of the present invention. The system mainly comprises a steam turbine 1, a generator 2, a constant-speed water feeding pump 8, a connecting device 7, a valve 5, a check valve 6 and a standby electric water feeding pump 3 which are coaxially connected. Compared with the first embodiment, in the scheme, the constant-speed water feeding pump 8, the connecting device 7, the valve 5, the check valve 6 and the standby electric water feeding pump 3 are arranged at the head of the steam turbine 1, and the control method of the constant-speed water feeding pump 8 and the related calculation and analysis process of the energy-saving benefit are the same as those of the first embodiment, and are not repeated herein.
Example three.
Fig. 4 shows a third embodiment of the present invention. The device mainly comprises a high-pressure cylinder 9, a low-pressure cylinder 10, a generator 2, two constant-speed water feeding pumps 8, a connecting device 7, a valve 5, a check valve 6 and a standby electric water feeding pump 3 which are coaxially connected. Compared with the first embodiment, one steam turbine 1 is divided into a single-flow high-pressure cylinder 9 and a double-flow low-pressure cylinder 10, and can be matched and applied to a unit with increased capacity, and the control method of the constant-speed water feed pump 8 is the same as that of the first embodiment, and is not described again here.
The energy saving benefit calculation analysis of the embodiment is as follows:
taking a certain 100MW self-contained thermoelectric unit in China as an example, the power-assisted water supply unit is put into production in 2002, a small-power electric water supply pump is configured to control water supply flow and pressure, the shaft power of the water supply pump is 1448kW, 2 water supply pumps which normally run can meet the water supply requirement of a single unit, the motor efficiency of the water supply pump is 92%, the generator efficiency is 98.8%, the transformer efficiency is 98%, after comprehensive calculation, the utilization efficiency of the water supply pump on electric energy is 89%, and the economical efficiency is poor.
After being driven by the steam turbine, eliminated the loss of generator, transformer and feed pump motor, conversion efficiency 100%, the station power consumption is practiced thrift 2 1448kW/89% -2 1448kW =357.9kW, and the calculation of operating 7200h annual, the annual festival is 357.9kW 7200h =257.7 ten thousand degrees of electricity, and the net electric charge of buying uses 0.54 yuan/degree of electricity, and individual unit can practice thrift 139 ten thousand yuan, implements the utility model discloses a benefit is showing.
Example four.
Fig. 5 shows a fourth embodiment of the present invention. The device mainly comprises a high-pressure cylinder 9, a low-pressure cylinder 10, a generator 2, two constant-speed water feeding pumps 8, a connecting device 7, a valve 5, a check valve 6 and a standby electric water feeding pump 3 which are coaxially connected. Compared with the third embodiment, in the scheme, the constant-speed water feeding pump 8, the connecting device 7, the valve 5, the check valve 6 and the standby electric water feeding pump 3 are arranged at the head of the high-pressure cylinder 9, and the control method of the constant-speed water feeding pump 8 and the related calculation and analysis process of the energy-saving benefit are the same as those of the third embodiment, and are not repeated herein.
Example five.
Fig. 6 shows a fifth embodiment of the present invention. The device mainly comprises a high-medium pressure cylinder 11, a low-medium pressure cylinder 10, a generator 2, two constant-speed water feeding pumps 8, a connecting device 7, a valve 5, a check valve 6 and a standby electric water feeding pump 3 which are coaxially connected. Compared with the third embodiment, one single-flow high-pressure cylinder 9 can be a double-flow high-intermediate-pressure cylinder 11, and can be matched with a single-reheat unit with further increased capacity, and the control method of the constant-speed water-feeding pump 8 and the related calculation and analysis process of the energy-saving benefit are similar to those of the third embodiment and are not repeated here.
Example six.
Fig. 7 shows a sixth embodiment of the present invention. The device mainly comprises a high-medium pressure cylinder 11, a low-medium pressure cylinder 10, a generator 2, two constant-speed water feeding pumps 8, a connecting device 7, a valve 5, a check valve 6 and a standby electric water feeding pump 3 which are coaxially connected. Compared with the fifth embodiment, in the scheme, the constant-speed water-feeding pump 8, the connecting device 7, the valve 5, the check valve 6 and the standby electric water-feeding pump 3 are arranged at the head of the high-medium pressure cylinder 11, and the control method of the constant-speed water-feeding pump 8 and the related calculation and analysis process of the energy-saving benefit are similar to those of the third embodiment and are not repeated here.
The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (9)
1. The utility model provides a coaxial constant speed feed water pump system, includes steam turbine, generator, connecting device, valve and reserve electronic feed water pump, its characterized in that still includes at least one constant speed feed water pump, the steam turbine the generator connecting device with the constant speed feed water pump is coaxial arranging, the steam turbine the generator is arranged one side of connecting device, the constant speed feed water pump is arranged connecting device's opposite side, reserve electronic feed water pump with the constant speed feed water pump is arranged side by side.
2. The coaxial fixed-speed feed pump system as claimed in claim 1, wherein the steam turbine is divided into two cylinders, the two cylinders being a high pressure cylinder and a low pressure cylinder or a high intermediate pressure cylinder and a low pressure cylinder.
3. A coaxial constant speed feed water pump system according to claim 1, wherein said connection means is arranged at the tail of said generator.
4. A coaxial fixed speed feed pump system as claimed in claim 1, wherein said connection means is arranged at the head of said turbine.
5. The coaxial constant-speed feed pump system as claimed in claim 1, wherein the valves are disposed on the inlet and outlet pipes of the constant-speed feed pump and the backup electric feed pump, and a check valve is disposed in front of the valves on the inlet and outlet pipes of the constant-speed feed pump and the backup electric feed pump.
6. The coaxial constant-speed feed water pump system as claimed in claim 1, wherein the constant-speed feed water pumps are configured with corresponding power and number according to unit capacity.
7. A coaxial fixed speed feed pump system as claimed in claim 1, wherein said connection means is a clutch.
8. A coaxial fixed speed feed pump system as claimed in claim 1, wherein said connection means is a coupling.
9. The coaxial fixed speed feed pump system of claim 1, wherein said turbine is extraction condensing or back pressure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021029052.9U CN212614904U (en) | 2020-06-08 | 2020-06-08 | Coaxial constant-speed water supply pump system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021029052.9U CN212614904U (en) | 2020-06-08 | 2020-06-08 | Coaxial constant-speed water supply pump system |
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| CN212614904U true CN212614904U (en) | 2021-02-26 |
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| CN202021029052.9U Active CN212614904U (en) | 2020-06-08 | 2020-06-08 | Coaxial constant-speed water supply pump system |
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