CN113074027A - Speed regulating system suitable for thermal power generating unit circulating water system - Google Patents
Speed regulating system suitable for thermal power generating unit circulating water system Download PDFInfo
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- CN113074027A CN113074027A CN202110375098.9A CN202110375098A CN113074027A CN 113074027 A CN113074027 A CN 113074027A CN 202110375098 A CN202110375098 A CN 202110375098A CN 113074027 A CN113074027 A CN 113074027A
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 34
- 238000001816 cooling Methods 0.000 claims abstract description 39
- 239000000498 cooling water Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000012423 maintenance Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000004378 air conditioning Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K9/00—Plants characterised by condensers arranged or modified to co-operate with the engines
- F01K9/003—Plants characterised by condensers arranged or modified to co-operate with the engines condenser cooling circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/10—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating characterised by the engine exhaust pressure
- F01K7/12—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating characterised by the engine exhaust pressure of condensing type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/10—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating characterised by the engine exhaust pressure
- F01K7/12—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating characterised by the engine exhaust pressure of condensing type
- F01K7/14—Control means specially adapted therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K9/00—Plants characterised by condensers arranged or modified to co-operate with the engines
- F01K9/02—Arrangements or modifications of condensate or air pumps
- F01K9/023—Control thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- Control Of Turbines (AREA)
Abstract
The invention discloses a speed regulating system suitable for a circulating water system of a thermal power generating unit, which comprises a steam turbine low-pressure cylinder, a condenser, a circulating water cooling device, a circulating water pump and a rotating speed regulating device, wherein the steam turbine low-pressure cylinder is connected with the condenser; the exhaust steam outlet of the steam turbine low-pressure cylinder is connected to the steam inlet of a condenser, the condenser is also provided with a condensed water outlet, the circulating water outlet of the circulating water cooling device is connected to the circulating water inlet of the condenser, and the circulating water outlet of the condenser is connected to the circulating water inlet of the circulating water cooling device through a circulating water pump; the circulating water pump is provided with a rotating speed adjusting device, a steam exhaust pipeline of the steam turbine low-pressure cylinder is provided with a steam exhaust pressure measuring point of the steam turbine low-pressure cylinder, and the rotating speed adjusting device is used for adjusting the rotating speed of the circulating water pump. The method can improve the efficiency and the reliability of speed regulation of the circulating water pump, so as to adapt to the continuously improved peak regulation requirement of a thermal power generating unit in the future and create favorable conditions for the construction of an intelligent power plant.
Description
Technical Field
The invention belongs to the field of power station boilers and steam turbine systems, and particularly relates to a speed regulating system suitable for a circulating water system of a thermal power generating unit.
Background
In recent years, the installed capacity of new energy electric power such as wind power, photovoltaic and hydropower in China is continuously and rapidly increased, and the installed capacity in service and under construction is the first in the world. New energy sources such as wind power and photovoltaic power provide a large amount of clean power for people, but on the other hand, the randomness and instability of generated output of the new energy sources also bring great challenges to the safe operation and power supply guarantee of a power system. From the current situation, the adjustment capability of the power system in China is difficult to completely adapt to the requirement of large-scale development and consumption of new energy, and the problems of wind abandonment, light abandonment and water abandonment are severe in some areas. In order to excavate the peak regulation potential of a thermal power generating unit, improve the thermal power operation flexibility of China and improve the new energy consumption capacity, the thermal power generating unit needs to operate under the working condition of wide-load and high-frequency load change, the power consumption rate of main auxiliary equipment of a power plant, such as a water pump, a fan and the like, is greatly improved, according to field test data, when the peak regulation of the unit is up to 30% of load, the power consumption rate of the plant is increased to about 10%, and the power supply efficiency is obviously reduced.
Many auxiliary machinery equipment adopt the frequency conversion speed governing mode, and the mode through using the converter to adjust the motor rotational speed is more mature, and the frequency conversion speed governing system has high power factor, and system power is high, adjusts the quality good, can realize many outstanding advantages such as motor soft start. But also highlights the problems of large system volume, high requirement of large power electronic conversion equipment on the operating environment, need of constructing a special industrial air conditioning plant, difficult equipment maintenance, high operating failure rate and the like in the application process. In addition, harmonic waves generated by a high-power high-voltage frequency conversion system directly connected with the grid seriously pollute the power grid, special treatment is needed, and equipment investment is increased. The speed regulation range of the speed regulation mode is 0-100%, however, the speed regulation in a narrow range may be actually needed, for example, 80-100% of the blower, which causes a great deal of margin waste of the speed regulation range, leads to low speed regulation efficiency and affects economic operation of a power plant.
Disclosure of Invention
The invention aims to provide a speed regulating system suitable for a circulating water system of a thermal power generating unit, which has the advantages of high reliability and usability, low manufacturing cost, huge energy-saving potential and deep application prospect in future high-frequency wide-load scenes.
In order to achieve the purpose, the invention adopts the technical scheme that:
a speed regulating system suitable for a circulating water system of a thermal power generating unit comprises a steam turbine low-pressure cylinder, a condenser, a circulating water cooling device, a circulating water pump and a rotating speed regulating device;
the exhaust steam outlet of the steam turbine low-pressure cylinder is connected to the steam inlet of a condenser, the condenser is also provided with a condensed water outlet, the circulating water outlet of the circulating water cooling device is connected to the circulating water inlet of the condenser, and the circulating water outlet of the condenser is connected to the circulating water inlet of the circulating water cooling device through a circulating water pump;
the circulating water pump is provided with a rotating speed adjusting device, a steam exhaust pipeline of the steam turbine low-pressure cylinder is provided with a steam exhaust pressure measuring point of the steam turbine low-pressure cylinder, the output end of the steam exhaust pressure measuring point of the steam turbine low-pressure cylinder is connected to the input end of the rotating speed adjusting device, and the rotating speed adjusting device is used for adjusting the rotating speed of the circulating water pump.
The invention has the further improvement that a circulating water inlet valve and a circulating water outlet valve of the condenser are respectively arranged at a circulating water inlet and a circulating water outlet of the condenser.
The invention is further improved in that the inlet and the outlet of the circulating water pump are respectively provided with a circulating pump water inlet valve and a circulating pump water outlet valve.
The invention is further improved in that a circulating water inlet and a circulating water outlet of the circulating water cooling device are respectively provided with a circulating water cooling device water inlet valve and a circulating water cooling device water outlet valve.
The invention is further improved in that the circulating water cooling device is a device which can cool the circulating water, such as a natural ventilation cooling tower, an indirect air cooling tower, a mechanical tower and the like.
The invention is further improved in that the rotating speed adjusting device is a double-fed system adjusting device or a refined rotating speed adjusting device.
The invention is further improved in that the speed regulation range of the speed regulation device is set according to the accurate speed range of the actual operation of the circulating water pump.
The invention is further improved in that the optimal operating back pressure of the unit is an objective function with the unit power, the cooling water inlet temperature and the cooling water flow as variables, and is the condenser pressure when the difference between the increment of the unit power and the increment of the power consumption of the circulating water pump is maximum in magnitude, and the optimal operating back pressure is calculated according to the formula (1):
F(N,t,W)＝ΔNT-ΔNP (1)
wherein N is the unit load, kW;
t is the cooling water inlet temperature, DEG C;
w is the cooling water flow rate, m3/s；
ΔNTThe power is increased slightly for the unit, kW;
Npfor power consumption of circulating water pumps, kW。
The invention is further improved in that the unit increases the output power delta N slightlyTThe calculation formula of (a) is as follows:
ΔNT＝f1(N，Pk)
wherein P iskSet back pressure, kPa.
The invention is further improved in that the circulating water pump consumes NpIs calculated as follows
Np＝f3(W)。
Compared with the prior art, the invention has at least the following beneficial technical effects:
according to the speed regulating system suitable for the circulating water system of the thermal power generating unit, the frequency regulating range of the rotating speed regulating device is set according to the accurate speed regulating range of the circulating water pump, so that simple, fine and continuous speed regulation of a non-frequency converter of the circulating water system is realized. When the operation working condition of the unit changes, the operation backpressure of the unit deviates from the optimal operation backpressure, the operation mode of the circulating water pump can be adjusted through the rotating speed adjusting device, so that the operation backpressure of the unit is close to the optimal backpressure as much as possible, the peak regulation requirement of the future thermal power unit is met, and favorable conditions are created for the construction of an intelligent power plant. In summary, the present invention has the following advantages:
(1) the non-variable-frequency simple fine continuous speed regulation of the circulating water pump can be realized, and the speed regulation efficiency is slightly higher than that of variable-frequency speed regulation.
(2) Compared with frequency conversion speed regulation, the double-fed system adjusting device does not need to occupy a large space, and is low in manufacturing cost and high in reliability.
(3) Compared with a double-speed motor, the double-feed system adjusting device is high in reliability, strong in usability and flexible in speed regulation mode, online speed regulation can be achieved, a pump does not need to be stopped, and maintenance workload of workers is reduced.
Drawings
FIG. 1 is a schematic diagram of a narrowing speed control method suitable for a circulating water system of a wet cooling unit.
In the figure: 1. the system comprises a steam turbine low-pressure cylinder, 2, a condenser, 3, a condenser circulating water inlet valve, 4, a condenser circulating water outlet valve, 5, a circulating water cooling device, 6, a circulating pump inlet valve, 7, a circulating water pump, 8, a circulating pump outlet valve, 9, a rotating speed adjusting device, 10, a steam turbine low-pressure cylinder exhaust pressure measuring point, 11, a circulating water cooling device outlet valve, 12 and a circulating water cooling device inlet valve.
Detailed Description
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, and it should be understood that the preferred embodiments described herein are merely for purposes of illustration and explanation and are not intended to limit the present invention.
The invention provides a narrowing speed regulating method suitable for a circulating water system of a wet cooling unit, which comprises a steam turbine low pressure cylinder 1, a condenser 2, a condenser circulating water inlet valve 3, a condenser circulating water outlet valve 4, a circulating water cooling device 5, a circulating pump inlet valve 6, a circulating water pump 7, a circulating pump outlet valve 8 and a rotating speed regulating device 9, wherein the circulating pump inlet valve and the circulating pump outlet valve are respectively connected with a circulating water inlet valve and a circulating water outlet valve of the condenser; the exhaust steam outlet of the steam turbine low-pressure cylinder 1 is connected to the steam inlet of the condenser 2, the condenser 2 is also provided with a condensed water outlet, the circulating water outlet of the circulating water cooling device 5 is connected to the circulating water inlet of the condenser 2, and the circulating water outlet of the condenser 2 is connected to the circulating water inlet of the circulating water cooling device 5 through a circulating water pump 7; and when the steam turbine low-pressure cylinder exhaust pressure measuring point 10 tests that the unit deviates from the optimal back pressure, the rotating speed adjusting device 9 acts to adjust the rotating speed of the circulating water pump 7, so that the flow of the circulating water pump is adjusted, and the unit always runs near the optimal back pressure.
Wherein, the inlet and outlet of the circulating water pump 7 are respectively provided with a circulating pump water inlet valve 6 and a circulating pump water outlet valve 7. The circulating water inlet and outlet of the circulating water cooling device 5 are respectively provided with a circulating water cooling device water inlet valve 12 and a circulating water cooling device water outlet valve 11. The circulating water cooling device 5 is a natural ventilation cooling tower, an indirect air cooling tower or a mechanical tower. The rotating speed adjusting device 9 is a double-fed system adjusting device or a refined rotating speed adjusting device.
Example 1
A certain 300MW wet cooling unit is matched with two YJG48P-40I type circulating water pumps produced by Hunan electric long sand water pumps, wherein one circulating water pump adopts frequency conversion speed regulation, the speed regulation range of a frequency converter is 0-100%, the speed regulation efficiency is about 96%, the cost of frequency conversion transformation is high, a special industrial air-conditioning plant needs to be built for the frequency converter, the equipment maintenance is difficult, the circulating water pump only needs to regulate the speed in a narrow range in actual operation, and is about 80-100%, so that a large amount of margin of the speed regulation range is wasted, the speed regulation efficiency is low, and the economic operation of a power plant is influenced.
The existing frequency conversion system is changed into a double-fed system adjusting device, the speed adjusting range of the device can be accurately set in a narrow-range speed adjusting mode according to the actual operation requirement of the circulating water pump, the usability is very high, the manufacturing cost is low, the reliability is high, and the device has a deep application prospect in the future high-frequency wide-load scene.
The narrowing speed regulation method is suitable for a circulating water system of a wet cooling unit, and the double-fed system regulating device can realize non-variable frequency narrowing fine continuous speed regulation of a circulating water pump according to the operation condition of the unit.
1. When the load of the unit is increased or the ambient temperature is increased, so that the operation back pressure of the unit is higher than the optimal back pressure: at the moment, the rotating speed of the circulating water pump 7 can be improved through the double-fed system adjusting device 9, so that the running back pressure of the unit is close to the optimal back pressure as much as possible;
2. when the load of the unit is reduced or the ambient temperature is reduced, so that the operation backpressure of the unit is lower than the optimal backpressure: at the moment, the rotating speed of the circulating water pump 7 can be reduced through the double-fed system adjusting device 9, so that the running backpressure of the unit is close to the optimal backpressure as much as possible.
Example 2
A certain 600MW indirect air cooling unit, three constant speed circulating water pumps of supporting, only rely on the operation number of pump regulation to adjust the flow of circulating water under variable operating mode or the degree of depth peak regulation operating mode, the regulation mode is very single and crude, and the usability is poor, brings very big work load for the operation personnel, is difficult to satisfy the operation demand of frequent regulation.
The existing constant-speed motor system is changed into a double-fed system adjusting device, the speed adjusting range of the device can be accurately set in a narrow-range speed adjusting mode according to the actual operation requirement of the circulating water pump, the speed adjusting efficiency is equivalent to the variable-frequency speed adjusting, the usability is very high, the manufacturing cost is low, the reliability is high, and the application prospect is far-reaching under the future high-frequency wide-load scene.
The narrowing speed regulation method is suitable for the circulating water system of the indirect air cooling unit, and the double-fed system regulating device can realize the non-variable frequency narrowing fine continuous speed regulation of the circulating water pump according to the running working condition of the unit.
1. When the load of the unit is increased or the ambient temperature is increased, so that the operation back pressure of the unit is higher than the optimal back pressure: at the moment, the rotating speed of the circulating water pump 7 can be improved through the double-fed system adjusting device, so that the running backpressure of the unit is close to the optimal backpressure as much as possible;
2. when the load of the unit is reduced or the ambient temperature is reduced, so that the operation backpressure of the unit is lower than the optimal backpressure: at the moment, the rotating speed of the circulating water pump 7 can be reduced through the double-fed system adjusting device, so that the running backpressure of the unit is close to the optimal backpressure as much as possible.
Example 3
The speed regulation system is characterized in that a certain model is N330-16.7/538/538, the model is a subcritical single intermediate reheating, single shaft, double cylinders, double steam discharge and reverse condensing steam turbine, the system is matched with an N-18800-5 type single backpressure single shell, double flow and surface condenser, and is matched with two YJG48P-40I type double-speed circulating water pumps, the motor is a double-speed motor, when the operation mode of the circulating water pump is switched, online dynamic rotation speed switching cannot be carried out, the pump needs to be stopped before switching, maintenance personnel change the wiring mode and then put into operation, the speed regulation mode is relatively inflexible, and the personnel maintenance workload is increased. The existing double-speed motor is changed into a refined rotating speed adjusting device, online flexible switching of the circulating water pump can be achieved after transformation, the two speed adjusting modes are very high in availability, low in manufacturing cost and high in reliability, and the application prospect is far-reaching under the future high-frequency wide-load scene.
A refined speed regulating device suitable for a high-low speed circulating water system can realize the online flexible switching of a circulating water pump according to the operation condition of a unit.
1. When the load of the unit is increased or the ambient temperature is increased, so that the operation back pressure of the unit is higher than the optimal back pressure: at the moment, the rotating speed of the circulating water pump 7 can be increased through a refined speed regulating device, so that the running back pressure of the unit is close to the optimal back pressure as much as possible;
2. when the load of the unit is reduced or the ambient temperature is reduced, so that the operation backpressure of the unit is lower than the optimal backpressure: at the moment, the rotating speed of the circulating water pump 7 can be reduced through a refined speed regulating device, so that the running backpressure of the unit is close to the optimal backpressure as much as possible.
Claims (10)
1. A speed regulating system suitable for a circulating water system of a thermal power generating unit is characterized by comprising a steam turbine low-pressure cylinder (1), a condenser (2), a circulating water cooling device (5), a circulating water pump (7) and a rotating speed regulating device (9);
an exhaust steam outlet of the steam turbine low-pressure cylinder (1) is connected to a steam inlet of a condenser (2), a condensed water outlet is further formed in the condenser (2), a circulating water outlet of a circulating water cooling device (5) is connected to a circulating water inlet of the condenser (2), and a circulating water outlet of the condenser (2) is connected to a circulating water inlet of the circulating water cooling device (5) through a circulating water pump (7);
the circulating water pump (7) is provided with a rotating speed adjusting device (9), a steam exhaust pipeline of the steam turbine low-pressure cylinder (1) is provided with a steam turbine low-pressure cylinder steam exhaust pressure measuring point (10), the output end of the steam turbine low-pressure cylinder steam exhaust pressure measuring point (10) is connected to the input end of the rotating speed adjusting device (9), and the rotating speed adjusting device (9) is used for adjusting the rotating speed of the circulating water pump (7).
2. The speed regulating system suitable for the circulating water system of the thermal power generating unit according to claim 1, wherein a condenser circulating water inlet valve (3) and a condenser circulating water outlet valve (4) are respectively arranged at a circulating water inlet and a circulating water outlet of the condenser (2).
3. The speed regulating system suitable for the thermal power generating unit circulating water system according to claim 1, characterized in that a circulating pump water inlet valve (6) and a circulating pump water outlet valve (8) are respectively arranged at an inlet and an outlet of the circulating water pump (7).
4. The speed regulating system suitable for the circulating water system of the thermal power generating unit according to claim 1, wherein a circulating water inlet and outlet of the circulating water cooling device (5) are respectively provided with a circulating water cooling device inlet valve (12) and a circulating water cooling device outlet valve (11).
5. The speed regulating system suitable for the thermal power generating unit circulating water system according to claim 1, wherein the circulating water cooling device (5) is a natural draft cooling tower, an indirect air cooling tower or a mechanical tower.
6. The speed regulating system suitable for the circulating water system of the thermal power generating unit according to claim 1, wherein the rotating speed regulating device (9) is a double-fed system regulating device or a refined rotating speed regulating device.
7. The speed regulating system suitable for the circulating water system of the thermal power generating unit according to claim 1, wherein the speed regulating range of the rotating speed regulating device (9) is set according to the rotating speed range of the circulating water pump (7) which is accurate in actual operation.
8. The system according to claim 1, wherein the optimal operating backpressure of the thermal power generating unit is an objective function with unit power, cooling water inlet temperature and cooling water flow as variables, and is in magnitude of condenser pressure at which a difference between an increment of the unit power and an increment of power consumption of the circulating water pump is maximum, and the optimal operating backpressure is calculated according to formula (1):
F(N,t,W)＝ΔNT-ΔNP (1)
wherein N is the unit load, kW;
t is the cooling water inlet temperature, DEG C;
w is the cooling water flow rate, m3/s；
ΔNTThe power is increased slightly for the unit, kW;
Npis the power consumption of a circulating water pump, kW.
9. The speed regulating system suitable for thermal power generating unit circulating water system of claim 8, characterized in that the unit increases output power Δ N a littleTThe calculation formula of (a) is as follows:
ΔNT＝f1(N，Pk)
wherein P iskSet back pressure, kPa.
10. The speed regulating system suitable for the thermal power generating unit circulating water system according to claim 8, wherein the circulating water pump consumes N powerpIs calculated as follows
Np＝f3(W)。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110375098.9A CN113074027A (en) | 2021-04-08 | 2021-04-08 | Speed regulating system suitable for thermal power generating unit circulating water system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110375098.9A CN113074027A (en) | 2021-04-08 | 2021-04-08 | Speed regulating system suitable for thermal power generating unit circulating water system |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1713510A (en) * | 2004-06-23 | 2005-12-28 | 河北工业大学电工厂 | Frequency variable speed-adjusting mechanism |
| CN103216282A (en) * | 2013-04-24 | 2013-07-24 | 华北电力大学 | Thermal power generating unit loading control system and method based on continuously adjustable back pressure |
-
2021
- 2021-04-08 CN CN202110375098.9A patent/CN113074027A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1713510A (en) * | 2004-06-23 | 2005-12-28 | 河北工业大学电工厂 | Frequency variable speed-adjusting mechanism |
| CN103216282A (en) * | 2013-04-24 | 2013-07-24 | 华北电力大学 | Thermal power generating unit loading control system and method based on continuously adjustable back pressure |
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Application publication date: 20210706 |
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