CN110219768B - Method and device for controlling excess pressure energy recycling power generation excess flow of circulating water system - Google Patents
Method and device for controlling excess pressure energy recycling power generation excess flow of circulating water system Download PDFInfo
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- CN110219768B CN110219768B CN201910504008.4A CN201910504008A CN110219768B CN 110219768 B CN110219768 B CN 110219768B CN 201910504008 A CN201910504008 A CN 201910504008A CN 110219768 B CN110219768 B CN 110219768B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
- F03B11/008—Measuring or testing arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B15/00—Controlling
- F03B15/02—Controlling by varying liquid flow
- F03B15/04—Controlling by varying liquid flow of turbines
- F03B15/06—Regulating, i.e. acting automatically
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/003—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus specially adapted for cooling towers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/30—Control parameters, e.g. input parameters
- F05B2270/301—Pressure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Control Of Water Turbines (AREA)
Abstract
The invention provides a method and a device for controlling the excess pressure energy recycling power generation overflow of a circulating water system, wherein the method comprises the following steps: monitoring a pressure parameter of the water turbine through the pressure sensor; and controlling the opening degree of the main pipeline regulating valve and/or the opening degree of the bypass pipeline regulating valve according to the pressure parameters so as to regulate the flow of the water turbine. The method is characterized in that the actual overflow of a bypass pipeline is judged by analyzing the inlet pressure of the water turbine and combining a characteristic curve of the water turbine, the opening of a main pipeline regulating valve and the opening of a bypass pipeline regulating valve are respectively controlled, and the reasonable distribution of the overflow of each cooling tower and the normal operation of a water turbine generator set are ensured.
Description
Technical Field
The invention relates to the field of industrial circulating water through-flow turbine generator sets, in particular to a method and a device for controlling the excess pressure energy recycling power generation overflow of a circulating water system.
Background
The existing circulating water system residual pressure energy recycling power generation technology comprises a main pipeline and a bypass pipeline, wherein a through-flow type hydraulic turbine set is installed on the bypass pipeline. Under the driving of the backwater residual pressure, the through-flow turbine rotates and drives the generator to output electric energy.
Due to the influences of factors such as device load, external environment and the like, the pressure of the supply water and the return water of the circulating water system is in a variable working condition state, and the available residual pressure energy of the return water of each cooling tower is unstable. Meanwhile, the number of cooling towers of a circulating water system is often more, the number of the cooling towers generally reaches 3-10, and because the difference of performance parameters of fans of each tower, internal parts of the tower and the like is larger, although the design treatment capacity of each tower is the same, the actual treatment capacity of each tower is different in the actual operation process, the water inflow of each hydroelectric generating set needs to be reasonably distributed, and the phenomenon that the circulating water temperature is too high due to the overhigh treatment capacity of a single tower is avoided.
Therefore, when generating electricity using a flow cell, the following problems must be considered:
(1) the problem of how to utilize the main pipeline system to release pressure energy when the circulating water quantity is too high is solved.
(2) The over-flow unbalance of the water turbine set is prevented, so that the water turbine deviates from the designed treatment capacity;
(3) the overflow balance of the water turbine is ensured, and the water balance unbalance of the cooling tower is avoided;
(4) the problem of when the circulating water yield is low excessively, the hydraulic turbine is insufficient in power is solved.
In order to be beneficial to safe, reliable and effective operation of the water turbine generator set and a circulating water system, a method for controlling the flow of the main pipeline and the bypass pipeline of the cooling tower is needed, and the water turbine generator set is ensured to be in a stable working state.
Disclosure of Invention
The invention mainly aims to provide a method and a device for controlling the excess pressure energy of a circulating water system to recycle power generation excess flow, so as to solve the problem of excess flow unbalance of a hydraulic turbine set in the prior art.
In order to achieve the purpose, the invention provides a power generation overflow control method for recycling residual pressure energy of a circulating water system, wherein a main pipeline of a cooling tower is provided with a main pipeline regulating valve, a bypass pipeline is provided with a bypass pipeline regulating valve and a pressure sensor, and the method comprises the following steps: monitoring a pressure parameter of the water turbine through the pressure sensor; and controlling the opening degree of the main pipeline regulating valve and/or the opening degree of the bypass pipeline regulating valve according to the pressure parameters so as to regulate the flow of the water turbine.
Optionally, the method further comprises: adjusting the water balance of the cooling tower, and determining the initial opening of the bypass pipeline regulating valve; acquiring the inlet pressure and the pressure maximum value of the water turbine when the cooling tower is in water balance to determine a water balance correction coefficient, wherein the water balance correction coefficient is equal to the ratio of the inlet pressure to the pressure maximum value.
Optionally, before monitoring the pressure parameter of the hydraulic turbine by the pressure sensor, the method further comprises: setting a maximum allowable pressure and a minimum allowable pressure of the hydraulic turbine, and setting an initial opening degree of the main pipe regulating valve to 0.
Optionally, the controlling, according to the pressure parameter, the opening degree of the main pipe regulating valve and/or the opening degree of the bypass pipe regulating valve to regulate the flow rate of the water turbine includes: judging the relation between the pressure parameter and the maximum allowable pressure; if the pressure parameter is larger than the maximum allowable pressure, determining that the flow of the water turbine is excessive; the opening degree of the bypass pipeline regulating valve is adjusted downwards by a first preset value; judging the relation between the pressure parameter and the minimum allowable pressure; and if the pressure parameter is smaller than the minimum allowable pressure, the opening degree of the bypass pipeline regulating valve is adjusted upwards to a second preset value.
Optionally, the number of cooling towers currently and actually operating is N, and controlling the opening degree of the main pipe regulating valve and/or the opening degree of the bypass pipe regulating valve according to the pressure parameter to regulate the flow rate of the water turbine includes: judging the value of mi multiplied by Pi in the N cooling towers, wherein mi is the water balance correction coefficient, and Pi is the pressure parameter; and if the difference value between the maximum value of the mi multiplied by Pi and the minimum value of the mi multiplied by Pi is larger than or equal to a preset difference value, the opening degree of the bypass pipeline regulating valve of the cooling tower corresponding to the maximum value is adjusted downwards by a third preset value, and the opening degree of the bypass pipeline regulating valve of the cooling tower corresponding to the minimum value is adjusted upwards by a fourth preset value.
Optionally, the number of cooling towers currently and actually operating is N, and controlling the opening degree of the main pipe regulating valve and/or the opening degree of the bypass pipe regulating valve according to the pressure parameter to regulate the flow rate of the water turbine includes: if the opening degrees of the bypass pipeline regulating valves of the N cooling towers are all 100% and the pressure parameters are all larger than the maximum allowable pressure, selecting the cooling tower corresponding to the minimum value of the mixPi in the N cooling towers, and adjusting the opening degree of the main pipeline regulating valve of the cooling tower corresponding to the minimum value up to a fifth preset value; otherwise, the opening degree of the main pipeline regulating valve is set to be 0.
Optionally, the method further comprises: and if the opening degree of the bypass pipeline regulating valve of the cooling tower between N is 100%, and the pressure parameters are smaller than the minimum allowable pressure, sending alarm information to prompt that the cooling tower is stopped, wherein the number of the cooling towers which actually run at present is adjusted to be N-1.
The invention also provides a power generation overflow control device for recycling the residual pressure energy of the circulating water system, which comprises a main pipeline regulating valve, a bypass pipeline regulating valve, a pressure sensor and a controller connected with the main pipeline regulating valve, the bypass pipeline regulating valve and the pressure sensor, wherein the main pipeline regulating valve is arranged in the middle of a main pipeline, the bypass pipeline regulating valve is arranged at an inlet of a bypass pipeline, the pressure sensor is arranged behind the bypass pipeline regulating valve, and the controller is used for executing the power generation overflow control method for recycling the residual pressure energy of the circulating water system.
Optionally, the pressure sensor has a precision of ± 0.1 level and a collection frequency of 1 HZ.
Optionally, the main pipeline regulating valve and the bypass pipeline regulating valve are both electric regulating valves.
The method and the device for controlling the power generation overflow by recycling the residual pressure energy of the circulating water system have the advantages that a main pipeline regulating valve is arranged on a main pipeline of a cooling tower, and a bypass pipeline is provided with a bypass pipeline regulating valve and a pressure sensor; monitoring the pressure parameter of the water turbine through the pressure sensor; and controlling the opening degree of the main pipeline regulating valve and/or the opening degree of the bypass pipeline regulating valve according to the pressure parameters so as to regulate the flow of the water turbine. The embodiment provides a control method taking water turbine inlet pressure as a main regulation basis for a circulating water system residual pressure backwater power generation system, judges actual overflow of a bypass pipeline by analyzing the water turbine inlet pressure and combining a water turbine characteristic curve, respectively controls the opening of a main pipeline regulating valve and the opening of a bypass pipeline regulating valve, and ensures reasonable overflow distribution of each cooling tower and normal operation of a water turbine generator set.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic flow chart of an alternative method for controlling the flow of power generation by recycling excess pressure energy of a circulating water system according to an embodiment of the invention;
FIG. 2 is a schematic diagram of an alternative cooling tower main and bypass piping arrangement according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of an alternative method for controlling the flow of the circulating water system for recycling the residual pressure energy to generate electricity according to the embodiment of the invention;
FIG. 4 is a schematic structural diagram of an alternative power generation flow control device for recycling residual pressure energy of a circulating water system according to an embodiment of the invention;
FIG. 5 is a schematic diagram illustrating an alternative cooling tower arrangement according to an embodiment of the present invention.
Wherein the figures include the following reference numerals:
1. an inlet end of the main pipeline; 2. a tower loading valve; 3. a bypass conduit; 4. a pressure sensor; 5. a water turbine; 6. a bypass line outlet valve; 7. cooling towers and tower internals; 8. a main pipeline regulating valve; 9. a bypass pipeline regulating valve; 10. 1# cooling tower; 11. 2# cooling tower; 12. a # 3 cooling tower; 13. a backwater main pipe; 14. and a controller.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1
According to the method for controlling the power generation overflow by recycling the residual pressure energy of the circulating water system, disclosed by the embodiment of the invention, a main pipeline of a cooling tower is provided with a main pipeline regulating valve, and a bypass pipeline is provided with a bypass pipeline regulating valve and a pressure sensor, as shown in figure 1, the method comprises the following steps:
and step S101, monitoring the pressure parameter of the water turbine through the pressure sensor.
The pressure sensor of the embodiment can be a high-precision pressure gauge, and the water turbine can be a through-flow turbine set.
And S102, controlling the opening degree of the main pipeline regulating valve and/or the opening degree of the bypass pipeline regulating valve according to the pressure parameter so as to regulate the flow of the water turbine.
As shown in fig. 2, the schematic layout of the cooling tower main pipe and bypass pipe equipment in the embodiment includes a main pipe inlet end 1, an upper tower valve 2, a bypass pipe 3, a pressure sensor 4, a water turbine 5, a bypass pipe outlet valve 6, cooling tower and tower internals 7, a main pipe regulating valve 8 and a bypass pipe regulating valve 9. This embodiment is through analysis hydraulic turbine inlet pressure, combines hydraulic turbine characteristic curve, judges the actual excess flow of bypass pipeline, controls the aperture of main pipeline governing valve and the aperture of bypass pipeline governing valve respectively, guarantees each cooling tower excess flow rational distribution and hydraulic turbine generating set's normal operating.
In this embodiment, arrange automatically regulated valve at trunk line and by pass line, install high accuracy pressure instrument behind the by pass line governing valve. Through monitoring pressure parameter, judge the hydraulic turbine overflow, realize the overcurrent protection of the hydraulic turbine and guarantee the water balance of cooling tower, can remind operating personnel in time to handle when unusual operating mode simultaneously, ensure the maximize of power generation benefit.
The method for controlling the flow of the circulating water system through power generation by recycling the residual pressure energy further comprises the following steps: adjusting the water balance of the cooling tower, and determining the initial opening of the bypass pipeline regulating valve; acquiring the inlet pressure and the pressure maximum value of the water turbine when the cooling tower is in water balance to determine a water balance correction coefficient, wherein the water balance correction coefficient is equal to the ratio of the inlet pressure to the pressure maximum value.
In this embodiment, the initial water balance parameter is set, and the correction coefficient of the pressure at the inlet of the water turbine (i.e., the water balance correction coefficient) is introduced, so that the water balance of the cooling tower is not damaged when the water turbine set is operated, and the supply water temperature of the circulating water system is not changed after the water turbine power generation equipment is installed to the maximum extent.
Optionally, before monitoring the pressure parameter of the hydraulic turbine by the pressure sensor, the method further comprises: setting a maximum allowable pressure and a minimum allowable pressure of the hydraulic turbine, and setting an initial opening degree of the main pipe regulating valve to 0.
In the embodiment, the maximum limit is set, when the pressure operation set value of the inlet of the water turbine indicates that the overflow of the water turbine is overlarge, the overflow of the water turbine can be reduced by adjusting the opening of the inlet valve of the water turbine, and the safe and reliable operation of the water turbine set is guaranteed.
Specifically, the controlling the opening degree of the main pipeline regulating valve and/or the opening degree of the bypass pipeline regulating valve according to the pressure parameter so as to regulate the flow of the water turbine comprises: judging the relation between the pressure parameter and the maximum allowable pressure; if the pressure parameter is larger than the maximum allowable pressure, determining that the flow of the water turbine is excessive; the opening degree of the bypass pipeline regulating valve is adjusted downwards by a first preset value; judging the relation between the pressure parameter and the minimum allowable pressure; and if the pressure parameter is smaller than the minimum allowable pressure, the opening degree of the bypass pipeline regulating valve is adjusted upwards to a second preset value.
Optionally, the number of cooling towers currently and actually operating is N, and controlling the opening degree of the main pipe regulating valve and/or the opening degree of the bypass pipe regulating valve according to the pressure parameter to regulate the flow rate of the water turbine includes: judging the value of mi multiplied by Pi in the N cooling towers, wherein mi is the water balance correction coefficient, and Pi is the pressure parameter; and if the difference value between the maximum value of the mi multiplied by Pi and the minimum value of the mi multiplied by Pi is larger than or equal to a preset difference value, the opening degree of the bypass pipeline regulating valve of the cooling tower corresponding to the maximum value is adjusted downwards by a third preset value, and the opening degree of the bypass pipeline regulating valve of the cooling tower corresponding to the minimum value is adjusted upwards by a fourth preset value.
Optionally, the number of cooling towers currently and actually operating is N, and controlling the opening degree of the main pipe regulating valve and/or the opening degree of the bypass pipe regulating valve according to the pressure parameter to regulate the flow rate of the water turbine includes: if the opening degrees of the bypass pipeline regulating valves of the N cooling towers are all 100% and the pressure parameters are all larger than the maximum allowable pressure, selecting the cooling tower corresponding to the minimum value of the mixPi in the N cooling towers, and adjusting the opening degree of the main pipeline regulating valve of the cooling tower corresponding to the minimum value up to a fifth preset value; otherwise, the opening degree of the main pipeline regulating valve is set to be 0.
Further, the method further comprises: and if the opening degree of the bypass pipeline regulating valve of the cooling tower between N is 100%, and the pressure parameters are smaller than the minimum allowable pressure, sending alarm information to prompt that the cooling tower is stopped, wherein the number of the cooling towers which actually run at present is adjusted to be N-1.
In the embodiment, when the water amount is reduced by 10%, the treatment capacity of each tower is reduced, the output of the water turbine is greatly reduced, and the whole power generation amount can be improved by stopping or starting the tower under the condition of ensuring the normal load of the cooling tower.
In the method for controlling the power generation overflow by recycling the residual pressure energy of the circulating water system, a main pipeline of a cooling tower is provided with a main pipeline regulating valve, and a bypass pipeline is provided with a bypass pipeline regulating valve and a pressure sensor; monitoring the pressure parameter of the water turbine through the pressure sensor; and controlling the opening degree of the main pipeline regulating valve and/or the opening degree of the bypass pipeline regulating valve according to the pressure parameters so as to regulate the flow of the water turbine. The embodiment provides a control method taking water turbine inlet pressure as a main regulation basis for a circulating water system residual pressure backwater power generation system, judges actual overflow of a bypass pipeline by analyzing the water turbine inlet pressure and combining a water turbine characteristic curve, respectively controls the opening of a main pipeline regulating valve and the opening of a bypass pipeline regulating valve, and ensures reasonable overflow distribution of each cooling tower and normal operation of a water turbine generator set.
Next, as shown in fig. 3, a method for controlling the flow rate of the power generation by recycling the residual pressure energy of the circulating water system according to the present embodiment will be described in detail:
in fig. 3, Pmax is the maximum allowable pressure of the turbine inlet; pmin is the minimum allowable pressure of the inlet of the water turbine; pgi is each pressure value in the initial water balance; mi is a water balance correction coefficient; nmax is the total number of cooling towers; alpha i is the opening of the front automatic regulating valve of each water turbine; beta i is the opening of the automatic regulating valve of each tower main pipeline; pi is a real-time monitoring value of the inlet pressure of each water turbine; n is the number of the current actual operation towers; t is the running time.
(1) Firstly, adjusting the water balance of each tower, determining the initial valve opening degree (namely the initial opening degree of the bypass pipeline regulating valve) alpha i0 of the inlet of the water turbine, counting the inlet pressure Pgi and the maximum pressure Pgimax of the water turbine when the tower is well balanced, and acquiring a water balance correction coefficient mi:
(2) and setting Pmax and Pmin of the water turbine according to the previous test data and the water turbine model selection data, wherein Pmax is the maximum allowable pressure of the inlet of the water turbine (namely the maximum allowable pressure), and Pmin is the minimum allowable pressure of the inlet of the water turbine (namely the minimum allowable pressure). Counting the number of the current cooling tower water turbines (namely the number of the current actual operating towers), setting the number to be N, and setting the opening of the initial main pipeline automatic regulating valve (namely the initial opening of the main pipeline regulating valve) to be 0.
(3) Counting the current inlet pressure Pi (namely the pressure parameter) of each water turbine, the opening degree alpha i (namely the opening degree of the bypass pipeline regulating valve) of the inlet of the water turbine and the opening degree beta i (namely the opening degree of the main pipeline regulating valve) of the main pipeline regulating valve by a pressure instrument (namely the pressure sensor) at intervals of 1 s;
(4) and judging the relation between Pi and a set value Pmax, if Pi exceeds Pmax, indicating that the flow of the water turbine is excessive, and at the moment, adjusting the opening alpha i of the automatic regulating valve at the inlet of the water turbine to be 5 percent (namely the first preset value) downwards to protect the power generation device of the water turbine.
(5) Judging the relation between Pi and a set value Pgi, if Pi is smaller than Pgi, increasing the opening degree alpha i of the automatic regulating valve at the inlet of the water turbine by 1 percent (namely the second preset value);
(6) judging the value of the mixPi in the N-interval tower, taking the maximum value number of the mixPi as a and the minimum value number of the mixPi as b, if the difference between ma xPa and mb xPb is large, reducing the opening degree alpha m of the valve of the m # tower by 1% (namely, reducing the opening degree of the bypass pipeline regulating valve of the cooling tower corresponding to the maximum value by a third preset value), and increasing the opening degree alpha N of the valve of the N # tower by 1% (namely, increasing the opening degree of the bypass pipeline regulating valve of the cooling tower corresponding to the minimum value by a fourth preset value), otherwise, not adjusting.
(7) If α i is all 100% open, and all Pi are greater than Pmax: when the cooling tower is fully opened, the opening degree of the main pipeline valve opening degree beta b of the Mi multiplied by Pi minimum value b tower is selected to be increased by 2% (namely, the opening degree of the main pipeline regulating valve of the cooling tower corresponding to the minimum value is adjusted up to a fifth preset value). If this condition is not met, β b is reset to 0. When the cooling tower is stopped, an alarm is given to remind field operators to start the cooling tower and the hydraulic turbine unit which are not started.
(8) If all the alpha i are 100% opening degrees and all Pi are smaller than Pmin, the water quantity of the system is indicated to be too small, an alarm is prompted, field operators are recommended to stop one tower, and the running quantity of the hydraulic turbine set and the tower is adjusted to be N-1.
Example 2
The excess pressure energy recycling power generation overflow control device of the circulating water system according to the embodiment of the invention, as shown in fig. 2 and 4, comprises:
trunk line governing valve 8, by pass line governing valve 9, pressure sensor 4 and with trunk line governing valve 8 by pass line governing valve 9 controller 14 that pressure sensor 4 connects, wherein, trunk line governing valve 8 sets up in the middle part of trunk line, by pass line governing valve 9 sets up in by pass line 3's entrance, pressure sensor 4 set up in behind by pass line governing valve 9, controller 14 is used for carrying out foretell circulating water system residual pressure energy recycle electricity generation flow control method.
The power generation overflow control device for recycling the residual pressure energy of the circulating water system adopts the technical scheme that a main pipeline regulating valve is arranged on a main pipeline of a cooling tower, and a bypass pipeline is provided with a bypass pipeline regulating valve and a pressure sensor; monitoring the pressure parameter of the water turbine through the pressure sensor; and controlling the opening degree of the main pipeline regulating valve and/or the opening degree of the bypass pipeline regulating valve according to the pressure parameters so as to regulate the flow of the water turbine. The embodiment provides a control method taking water turbine inlet pressure as a main regulation basis for a circulating water system residual pressure backwater power generation system, judges actual overflow of a bypass pipeline by analyzing the water turbine inlet pressure and combining a water turbine characteristic curve, respectively controls the opening of a main pipeline regulating valve and the opening of a bypass pipeline regulating valve, and ensures reasonable overflow distribution of each cooling tower and normal operation of a water turbine generator set.
As shown in fig. 2 and 5, taking the system including a # 1 cooling tower 10, a # 2 cooling tower 11, and a # 3 cooling tower 12, each cooling tower being connected by a return water main pipe 13 as an example, the excess pressure energy recycling power generation overflow control device of the circulating water system provided by the invention includes an automatic regulating valve (including a main pipe regulating valve 8 and a bypass pipe regulating valve 9), a pressure sensor 4, and 1 set of each cooling tower (i.e. the # 1 cooling tower 10, the # 2 cooling tower 11, and the # 3 cooling tower 12); the automatic regulating valve is arranged in the middle of the main pipeline and at the inlet position of the bypass pipeline, and the high-precision pressure sensor is arranged behind the automatic regulating valve of the bypass pipeline.
In the device, the automatic regulating valve is an electric regulating valve and is used for controlling the flow of the main pipeline and the bypass pipeline.
In the device, the precision of the pressure sensor is +/-0.1 grade, the acquisition frequency is 1HZ, and the pressure sensor is used for monitoring the back parameter of the bypass pipeline electric regulating valve, namely the pressure at the inlet of the water turbine in real time.
The embodiment develops a control program which takes the inlet pressure of the water turbine as a main adjusting basis for a circulating water system residual pressure backwater power generation system. Through analyzing each tower hydraulic turbine inlet pressure, combine hydraulic turbine characteristic curve, judge the actual overfall of bypass line, control tower main pipe way automatically regulated valve opening and bypass line automatically regulated valve opening respectively between each, guarantee each tower overfall rational distribution and hydraulic turbine generating set's normal operating.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. The utility model provides a circulating water system residual pressure can recycle electricity generation overflow control method which characterized in that, the trunk line of cooling tower is provided with the trunk line governing valve, and the bypass pipeline is provided with bypass pipeline governing valve and pressure sensor, the method includes: monitoring a pressure parameter of the water turbine through the pressure sensor; controlling the opening degree of the main pipeline regulating valve and/or the opening degree of the bypass pipeline regulating valve according to the pressure parameter so as to regulate the flow of the water turbine;
the method comprises the following specific steps:
(1) firstly, adjusting the water balance of each tower, determining the initial valve opening alpha i0 of a water turbine inlet, wherein i represents the position number of each tower, counting the inlet pressure Pgi and the maximum value Pgimax of the water turbine when the tower is well balanced, and acquiring a water balance adjustment coefficient mi;
(2) setting Pmax and Pmin of the water turbine according to the early-stage test data and the water turbine model selection data, wherein Pmax is the maximum allowable pressure of the inlet of the water turbine, Pmin is the minimum allowable pressure of the inlet of the water turbine, counting the running number of the water turbine of the current cooling tower, setting the running number as N, and setting the opening of an automatic regulating valve of the main pipeline as an initial value to be 0;
(3) counting the inlet pressure Pi of each current water turbine, the opening alpha i of an automatic regulating valve of the inlet of the water turbine and the opening beta i of an automatic regulating valve of a main pipeline at intervals of 1s among the pressure instruments;
(4) judging the relation between Pi and a set value Pmax, if Pi exceeds Pmax, indicating that the flow of the water turbine is excessive, and at the moment, adjusting the opening alpha i of the inlet valve of the water turbine down by 5 percent to protect a power generation device of the water turbine;
(5) judging the relation between Pi and a set value Pgi, and if Pi is smaller than Pgi, increasing the valve opening by 1%;
(6) judging the value of the MixPi in the N inter-tower, taking the MixPi maximum value number i as a, and the MixPi minimum value number i as b, if the difference between ma xPa and mb xPb is large, reducing the valve opening alpha a of the a tower by 1%, reducing the valve opening alpha b of the b tower by 1%, otherwise, not adjusting;
(7) if α i is all 100% open, and all Pi are greater than Pmax: when the cooling tower is fully opened, the opening beta b of the main pipeline valve of the Mi multiplied Pi minimum b tower is selected to be increased by 2%, if the condition is not met, the beta b is reset to be 0, and when the cooling tower is stopped, an alarm is given to remind a field operator to start the cooling tower and a hydraulic turbine unit which are not started;
(8) if all the alpha i are 100% opening degrees and all Pi are smaller than Pmin, the water quantity of the system is indicated to be too small, an alarm is prompted, field operators are recommended to stop one tower, and the running quantity of the hydraulic turbine set and the tower is adjusted to be N-1.
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| DE3133831A1 (en) * | 1981-08-27 | 1983-03-17 | Ekkehard B. Dipl.-Ing. 7302 Ostfildern Bretting | Method for controlling with optimum energy the connection between the heat exchangers and the remaining parts of a right-hand cycle, in particular of drying towers and wet cooling towers for power stations (plants) |
| CN201071782Y (en) * | 2007-03-30 | 2008-06-11 | 银虹科技(深圳)有限公司 | Complementary energy recovery utilization device used for industrial cycle water |
| CN201582037U (en) * | 2009-09-25 | 2010-09-15 | 湖北华强化工集团有限公司 | Excess pressure utilization equipment for circulating water of cooling tower |
| CN202024619U (en) * | 2010-12-31 | 2011-11-02 | 北大方正集团有限公司 | Cooling tower circulating water system |
| CN202250569U (en) * | 2011-10-15 | 2012-05-30 | 唐山市热力总公司 | Structure utilizing residual pressure of high area return water for power generation of high and low-area direct-connected heat supply system |
| CN104329202A (en) * | 2014-10-24 | 2015-02-04 | 上海福思特流体机械有限公司 | Bulb through-flow turbine |
| CN204719518U (en) * | 2015-06-01 | 2015-10-21 | 北京京能未来燃气热电有限公司 | A kind of recirculated water optimization system |
| CN205477788U (en) * | 2016-03-31 | 2016-08-17 | 北京燃气能源发展有限公司 | Gas pressure regulating facility residual pressure utilizes system |
| CN108661845A (en) * | 2018-04-11 | 2018-10-16 | 国电中自（合肥）电气科技有限公司 | A kind of circulating water excess pressure power generator |
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2019
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