CN111946463B - Gas turbine intake blowback control method, system and computer readable medium - Google Patents

Gas turbine intake blowback control method, system and computer readable medium Download PDF

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Publication number
CN111946463B
CN111946463B CN202010815161.1A CN202010815161A CN111946463B CN 111946463 B CN111946463 B CN 111946463B CN 202010815161 A CN202010815161 A CN 202010815161A CN 111946463 B CN111946463 B CN 111946463B
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pressure difference
back flushing
blowback
blowing
gas turbine
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CN111946463A (en
Inventor
张平
刘小龙
李星星
罗易洲
吕思琦
王辉
王冠霖
蔡兴龙
魏国富
王子聪
张富渊
杨晓东
付华正
李亚民
徐福根
李文军
黄�俊
陈浦
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Liaoning Waldwalker Technology Co Ltd
Pipe Network Group Xinjiang United Pipeline Co ltd
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Beijing Waldwalker Technology Co Ltd
Petrochina Northwest United Pipeline Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/04—Air intakes for gas-turbine plants or jet-propulsion plants
    • F02C7/05—Air intakes for gas-turbine plants or jet-propulsion plants having provisions for obviating the penetration of damaging objects or particles
    • F02C7/055—Air intakes for gas-turbine plants or jet-propulsion plants having provisions for obviating the penetration of damaging objects or particles with intake grids, screens or guards
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/04—Air intakes for gas-turbine plants or jet-propulsion plants
    • F02C7/05—Air intakes for gas-turbine plants or jet-propulsion plants having provisions for obviating the penetration of damaging objects or particles
    • F02C7/052—Air intakes for gas-turbine plants or jet-propulsion plants having provisions for obviating the penetration of damaging objects or particles with dust-separation devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/04—Air intakes for gas-turbine plants or jet-propulsion plants
    • F02C7/057—Control or regulation

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Turbines (AREA)

Abstract

The invention discloses a gas turbine intake back flushing control method, a system and a computer readable medium, wherein the gas turbine intake back flushing control method comprises the following steps: obtaining a blowback start threshold omega1Back-blowing stop threshold omega2And a blowback duration t; acquiring the pressure difference delta P between the inner side and the outer side of the air filter and judging whether the pressure difference delta P is larger than the back flushing starting threshold omega1If the pressure is larger than the preset pressure, back flushing is started, and the back flushing valves are sequentially conducted to carry out back flushing and all the back flushing valves are simultaneously opened to carry out back flushing for one time during back flushing; the pressure difference delta P 'is obtained again, if the pressure difference delta P' is larger than the back flushing stop threshold omega2Repeating the back flushing of the steps; after the back blowing is finished, the pressure difference delta P 'is obtained again, if the pressure difference delta P' is larger than the back blowing stop threshold omega2Sending an error reporting signal to apply for human intervention; if the value is less than the back-blowing stop threshold value omega2And the back blowing is finished. The invention can play a better back-blowing effect on the gas turbine filter by adopting a method of back-blowing and matching twice, and has low back-blowing cost.

Description

Gas turbine intake blowback control method, system and computer readable medium
Technical Field
The invention relates to the technical field of gas turbine equipment maintenance, in particular to a gas turbine intake back flushing control method, a gas turbine intake back flushing control system and a computer readable medium.
Background
Gas turbine and boat modified engine are in the course of the work, need to extract the air and be used for the burning, in order to prevent that dust particle from getting into the engine, damage blade equipment, install air cleaner additional at the inlet end usually, however, air cleaner is in long-term use, dust is piled up at the filter air intake, cause the air intake to block up, make the poor grow gradually in the preceding later stage of filter, the influence process of breathing in, consequently, pile up certain volume after dust, need change the filter core, however, it is not only with high costs and the cycle length to change the filter core, need shut down and go on, seriously influence work efficiency, and it is big to change the engineering volume.
Under the normal condition, dust in the air is more easily deposited at the middle lower part of the filter under the action of self gravity and an air flow field and is gradually increased from top to bottom, but the conventional back flushing device is generally uniformly distributed and performs back flushing simultaneously, so that the back flushing effect is not ideal, and the resource waste is caused; on the other hand, the gas for back flushing usually uses the common gas compressed by the compressor, and the gas is not dry enough, so that the dust on the filter element of the air filter, which is dropped by back flushing, is easily wetted and re-adsorbed on the air filter.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a method, a system and a computer readable medium for controlling blowback of intake air of a gas turbine to solve the above technical problems.
In order to achieve the above technical object, a first aspect of the embodiments of the present invention provides a method for controlling blowback of intake air of a gas turbine, which is improved by the following steps:
obtaining a blowback start threshold omega1Back-blowing stop threshold omega2And a blowback duration t;
acquiring the pressure difference delta P between the inner side of the air filter and the outer side of the air filter;
judging whether the pressure difference delta P is at the back flushing starting threshold value omega or not according to the pressure difference delta P1Within the range;
when the pressure difference delta P is larger than the back flushing starting threshold value omega1If so, starting back flushing, sequentially conducting back flushing valves to carry out back flushing during back flushing, and simultaneously starting all back flushing valves to carry out back flushing once after the back flushing is finished;
after the back-blowing is finished, the air filter is obtained againThe pressure difference delta P 'between the inner side and the outer side of the air filter is larger than the back flushing stop threshold omega if the pressure difference delta P' is larger than the back flushing stop threshold2If so, continuing to start back flushing, sequentially conducting back flushing valves to back flush during back flushing, and simultaneously starting all back flushing valves to back flush after the back flushing is finished;
after the back blowing is finished, the pressure difference delta P 'between the inner side of the air filter and the outer side of the air filter is obtained again, and if the pressure difference delta P' is still larger than the back blowing stop threshold omega2If so, sending an error reporting signal and applying for human intervention; if the pressure difference delta P' is smaller than the back flushing stopping threshold value omega2And the back blowing is finished.
Further, the back flushing starting threshold value omega is obtained1Back-blowing stop threshold omega2Comprising:
in the working process of the gas turbine, testing the working efficiency eta corresponding to the gas turbine under different pressure difference delta P, and obtaining that the working efficiency eta corresponding to the gas turbine is gradually reduced along with the increase of the pressure difference delta P;
according to adjacent two said working efficiencies being eta1、η2Obtaining two corresponding pressure difference delta P1、ΔP2And calculating the slope k:
Figure BDA0002630282860000021
let the point at which the absolute value of the slope is maximum be kmaxCalculating kmaxTwo of said working efficiencies η being adjacent in timemax1And ηmax2Corresponding pressure difference Δ Pmax1And Δ Pmax1(ii) a And the pressure difference DeltaPmax1As a blowback stop threshold ω2Will be the pressure difference Δ Pmax2As a blowback start threshold ω1A value of (d);
wherein, the working efficiency eta1< work efficiency η2(ii) a Pressure difference Δ P1< pressure difference Δ P2(ii) a Back flushing stop threshold omega2< start threshold for blowback ω1(ii) a Pressure difference Δ Pmax1Pressure differenceΔPmax2。
Furthermore, the blowback duration t is set according to the actual use environment, and includes the environment humidity and the oil content in the air, and the blowback duration is in a direct proportion relationship with the environment humidity and the oil content in the air.
Further, in the back flushing process, the turn-on sequence of the back flushing valves is sequentially opened from top to bottom, and instrument air is used in the back flushing process.
Furthermore, after the manual intervention, the conduction sequence of the back-blowing valve can be controlled in a manual control mode, and the duration time of blowing can be adjusted.
In order to achieve the above technical object, a second aspect of the embodiments of the present invention provides a gas turbine intake blowback control system, which is improved by comprising:
the PLC is used for generating a back flushing starting and stopping control signal;
the control module is used for outputting an error reporting indication signal, feeding back the duration of back flushing, and receiving a signal controlled by the PLC for signal retransmission;
the data acquisition module is used for acquiring pressure differences delta P, delta P 'and delta P' between the inner side and the outer side of the air filter;
the timing module is used for recording and feeding back the back flushing time;
the output module is used for outputting a control signal and controlling the on-off of the back flushing valve;
the power supply module is used for providing required electric energy for the normal operation of each module in the system;
the LED error reporting indicating module receives an error reporting indicating signal sent by the control module and converts the received signal into an LED optical signal for indicating;
the switching value input module is used for converting an input switching signal into a low-voltage signal inside the PLC and realizing the electrical isolation of signals inside and outside the PLC;
the manual control module is used for carrying out back flushing adjustment in a way of manually controlling back flushing when the back flushing effect is not ideal;
and the communication module is used for connecting the PLC with the control module and transmitting data and signals.
Further, the PLC controller includes a storage module therein, configured to store the back-flushing start threshold ω1The back-blowing stop threshold value omega2And the blowback duration t.
Furthermore, the data acquisition module is a differential pressure switch, the differential pressure switch is connected with the PLC, and the differential pressure switch is used for acquiring the pressure difference between the inner side and the outer side of the air filter.
Furthermore, the communication module is respectively connected with the PLC and the control module and supports dual-redundancy communication, so that the stability of data transmission between the PLC and the control module is ensured.
To achieve the above technical object, a third aspect of the embodiments of the present invention provides a computer-readable medium storing a computer program, which when being processed and executed, implements the steps of the gas turbine intake blowback control method described above.
In the embodiment of the invention, a better back flushing effect can be achieved for the gas turbine filter by adopting a method of mutual cooperation of two back flushing, and the back flushing cost is low by adopting the mode.
Drawings
FIG. 1 is a flow chart of a gas turbine intake blowback control method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an intake blowback control system of a gas turbine according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
FIG. 1 is a flowchart of a gas turbine intake blowback control method according to an embodiment of the present invention. As shown in fig. 1, the method for controlling blowback of intake air of a gas turbine according to the embodiment includes the following steps:
obtaining a blowback start threshold omega1Back-blowing stop threshold omega2And a blowback duration t;
acquiring the pressure difference delta P between the inner side of the air filter and the outer side of the air filter;
judging whether the pressure difference delta P is at the back flushing starting threshold value omega or not according to the pressure difference delta P1Within the range;
when the pressure difference delta P is larger than the back flushing starting threshold value omega1If so, starting back flushing, sequentially conducting back flushing valves to carry out back flushing during back flushing, and simultaneously starting all back flushing valves to carry out back flushing once after the back flushing is finished;
after the back blowing is finished, the pressure difference delta P 'between the inner side of the air filter and the outer side of the air filter is obtained again, and if the pressure difference delta P' is larger than the back blowing stop threshold omega2If so, continuing to start back flushing, sequentially conducting back flushing valves to back flush during back flushing, and simultaneously starting all back flushing valves to back flush after the back flushing is finished;
after the back blowing is finished, the pressure difference delta P 'between the inner side of the air filter and the outer side of the air filter is obtained again, and if the pressure difference delta P' is still larger than the back blowing stop threshold omega2If so, sending an error reporting signal and applying for human intervention; if the pressure difference delta P' is smaller than the back flushing stopping threshold value omega2And the back blowing is finished.
In the above embodiment, the back-flushing start threshold ω is set in advance according to the actual usage environment1Back-blowing stop threshold omega2And the back flushing duration time t, acquiring the pressure difference delta P between the inner side and the outer side of the air filter, and comparing the pressure difference delta P with a back flushing starting threshold value omega1Comparison was made when pressingThe strength difference delta P is larger than a back-blowing starting threshold value omega1It is described that more dust is deposited on the air filter and will have a certain influence on the normal operation of the gas turbine, therefore, the back flushing needs to be started to remove the dust on the filter, when the back flushing is performed, firstly, after the machine is stopped, the back flushing valves are sequentially conducted to perform the back flushing, the back flushing is performed on the filter from top to bottom, so that the dust adhered on the filter reversely blows off the dust under the larger explosive force at the moment when the back flushing valves are conducted, and after the completion, all the back flushing valves are simultaneously opened to perform the back flushing once, thereby preventing the dust falling off by the back flushing from being re-adsorbed on the filter, and through the back flushing, the pressure difference delta P ' inside the air filter and the pressure difference delta P ' outside the air filter are re-obtained, and the pressure difference delta P ' and the back flushing stop threshold omega are stopped2Comparing, at this time, the pressure difference delta P' is smaller than the back-blowing stop threshold omega2If so, the back flushing effect is good, back flushing is not needed, and the back flushing is finished; if the pressure difference delta P' is larger than the back flushing stop threshold omega2If the pressure difference between the inside pressure of the air filter and the outside pressure difference is smaller than the back flushing stop threshold omega, the back flushing effect is poor, the filter is attached with dust with more oil, the back flushing needs to be continuously carried out, the two back flushing steps are repeated, and after the back flushing is finished, the pressure difference delta P 'between the inside pressure of the air filter and the outside pressure of the air filter is obtained again, and the pressure difference delta P' and the back flushing stop threshold omega are compared2Comparing, at this time, the pressure difference delta P' is smaller than the back-blowing stop threshold value omega2If so, the back flushing effect is good, back flushing is not needed, and the back flushing is finished; if the pressure difference delta P' is larger than the back-blowing stop threshold omega2If the back-blowing effect is poor, then sending an error-reporting signal, applying for human intervention, and performing back-blowing by manually controlling a back-blowing mode.
It should be noted that the blowback valves are generally uniformly installed and distributed, but dust in the air is more easily deposited at the middle-lower part of the filter under the action of self gravity and the air flow field, and is gradually increased from top to bottom, so in the embodiment of the present application, the number of the blowback valves at the lower end of the filter can be more than that at the top end of the filter, thereby increasing the blowback unit area at the lower end of the filter, and ensuring the blowback effect.
Further, the back flushing starting threshold value omega is obtained1Back-blowing stop threshold omega2Comprising:
in the working process of the gas turbine, testing the working efficiency eta corresponding to the gas turbine under different pressure difference delta P, and obtaining that the working efficiency eta corresponding to the gas turbine is gradually reduced along with the increase of the pressure difference delta P;
according to adjacent two said working efficiencies being eta1、η2Obtaining two corresponding pressure difference delta P1、ΔP2And calculating the slope k:
Figure BDA0002630282860000051
let the point at which the absolute value of the slope is maximum be kmaxCalculating kmaxTwo of said working efficiencies η being adjacent in timemax1And ηmax2Corresponding pressure difference Δ Pmax1And Δ Pmax1(ii) a And the pressure difference DeltaPmax1As a blowback stop threshold ω2Will be the pressure difference Δ Pmax2As a blowback start threshold ω1A value of (d);
wherein, the working efficiency eta1< work efficiency η2(ii) a Pressure difference Δ P1< pressure difference Δ P2(ii) a Back flushing stop threshold omega2< start threshold for blowback ω1(ii) a Pressure difference Δ Pmax1< pressure difference Δ Pmax2。
In the above scheme, in the working process of the gas turbine, a large amount of air needs to be utilized to ensure the working efficiency, after more dust is deposited on the filter, a certain pressure difference is generated between the pressure inside the filter and the pressure outside the air filter, the air inlet resistance of the gas turbine is increased, the specific volume of the air is increased, at the moment, the air inlet amount of the gas turbine in unit time is reduced, the working efficiency of the gas turbine is influenced, and the power of the gas turbine is reduced, so that the working efficiency of the gas turbine, the pressure inside the filter and the pressure outside the air filter can be obtained through theoretical calculation or actual measurement and calculationThe relation of the side pressure difference is calculated, the change slope of the working efficiency and the pressure difference is calculated, and the point k with the maximum absolute value of the slope is selectedmaxAnd will kmaxCorresponding pressure difference Δ Pmax1As a blowback stop threshold ω2Will k ismaxCorresponding pressure difference Δ Pmax2As a blowback start threshold ω1The value of (c).
Note that, the point k at which the absolute value of the slope is maximummaxIt can be stated that the maximum variation of the working efficiency and the pressure difference at this time can be used as a dividing point of the great decrease of the working efficiency of the gas turbine, and therefore, the maximum variation can be used for determining the back flushing start threshold ω1And a blowback stop threshold ω2。
Furthermore, the blowback duration t is set according to the actual use environment, and includes the environment humidity and the oil content in the air, and the blowback duration is in a direct proportion relationship with the environment humidity and the oil content in the air.
Specifically, because service environment's difference, for example, north air drying, and south air is comparatively moist for there is great difference in the life of filter also, and the firm degree that the dust is adnexed is also very different, and south air is moist, makes dust humidity great, consequently, adheres to on the filter more easily, and with filter contact inseparabler more, when the blowback, the blowback duration need be adjusted according to the environment of in-service use, in order to guarantee the effect of blowback.
Further, in the back flushing process, the turn-on sequence of the back flushing valves is sequentially opened from top to bottom, and instrument air is used in the back flushing process.
Specifically, in the prior art, during back blowing, ordinary compressed gas is often used, which has a high humidity, and tends to wet the originally dry dust and attach the dust to the filter during the back blowing process, and this can be avoided by using an instrument.
Furthermore, after the manual intervention, the conduction sequence of the back-blowing valve can be controlled in a manual control mode, and the duration time of blowing can be adjusted.
In the embodiment of the invention, the back flushing starting threshold, the back flushing stopping threshold and the back flushing duration are set, the automatic accurate control is realized by combining the pressure difference between the inner side and the outer side of the filter, and the back flushing effect is ensured by combining two different back flushing modes. The invention can ensure the back-blowing effect on the basis of controlling the cost, thereby ensuring the working efficiency of the gas turbine and providing reliable and credible reference basis for personnel in related industries.
Referring to fig. 2, fig. 2 is a schematic diagram of an intake blowback control system of a gas turbine according to an embodiment of the present invention. As shown in fig. 2, the gas turbine intake blowback control system of the embodiment includes:
the PLC is used for generating a back flushing starting and stopping control signal;
the control module is used for outputting an error reporting indication signal, feeding back the duration of back flushing, and receiving a signal controlled by the PLC for signal retransmission;
the data acquisition module is used for acquiring pressure differences delta P, delta P 'and delta P' between the inner side and the outer side of the air filter;
the timing module is used for recording and feeding back the back flushing time;
the output module is used for outputting a control signal and controlling the on-off of the back flushing valve;
the power supply module is used for providing required electric energy for the normal operation of each module in the system;
the LED error reporting indicating module receives an error reporting indicating signal sent by the control module and converts the received signal into an LED optical signal for indicating;
the switching value input module is used for converting an input switching signal into a low-voltage signal inside the PLC and realizing the electrical isolation of signals inside and outside the PLC;
the manual control module is used for carrying out back flushing adjustment in a way of manually controlling back flushing when the back flushing effect is not ideal;
and the communication module is used for connecting the PLC with the control module and transmitting data and signals.
Further, the PLC controller includes a storage module therein, configured to store the back-flushing start threshold ω1The back-blowing stop threshold value omega2And the blowback duration t.
In the above scheme, the PLC controller is a digital electronic device with a microprocessor, and is a digital logic controller for automation control, and can load control instructions into a memory at any time for storage and execution. The programmable controller is modularly assembled by an internal CPU, an instruction and data memory, an input/output unit, a power supply module, a digital analog unit and the like, has more functions and can reduce the use of other storage units.
Specifically, the PLC controller is directly used for storing the back flushing starting threshold value omega1The back-blowing stop threshold value omega2And the back flushing duration t, so that the redundancy of the system is avoided.
Furthermore, the data acquisition module is a differential pressure switch, the differential pressure switch is connected with the PLC, and the differential pressure switch is used for acquiring the pressure difference between the inner side and the outer side of the air filter.
According to the scheme, the pressure difference between the inner side and the outer side of the air filter is measured by directly using the differential pressure switch, the high pressure on the outer side of the air filter and the low pressure on the inner side of the air filter respectively enter a high pressure cavity and a low pressure cavity of the differential pressure switch, the sensed differential pressure enables the pressure sensing diaphragm to deform, the micro switch at the uppermost end is finally started through mechanical structures such as a railing spring and the like, an electric signal is output, the output electric signal is transmitted to the PLC, when the pressure difference reaches a set back blowing starting threshold value, the output electric signal reaches the threshold value of the PLC, the PLC sends a back blowing starting signal to carry out back blowing, and after the first round of back blowing is finished, the PLC judges whether the pressure difference reaches a back blowing stopping threshold value according to the electric signal output by the differential pressure switch, so that back blowing is stopped or the back blowing of the next round is carried out.
Furthermore, the communication module is respectively connected with the PLC and the control module and supports dual-redundancy communication, so that the stability of data transmission between the PLC and the control module is ensured.
Specifically, the data transmission is carried out by using dual redundant communication, the stability of the data transmission is ensured, when a problem occurs in a main transmission line, the data transmission is failed, and the data transmission can be carried out through another transmission line, so that the stability of the data transmission is ensured.
The communication module comprises a bus set, wherein the bus set is used for transmitting one link of information formed by modulating a plurality of data, and can also be used for transmitting a plurality of links of different data respectively. More specifically, the bus set in the embodiment of the present invention includes a first bus set and a second bus set; the first bus set can realize data transmission between the PLC and the control module, the second bus set is a redundant backup of the first bus set and shares one set of the input data bus with the first bus set, and the second bus set is only started to be used when the first bus cannot normally transmit data.
Specifically, the control module may be a Central Processing Unit (CPU), or may be other general-purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated CircUit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, a discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
Specifically, the output module is used for outputting a control signal to control the on-off of the back flushing valve; and the blowback valve is two three-way solenoid valves, and the break-make of on-off control instrument wind through the solenoid valve, solenoid valve quantity can set up to 32 to adopt the mode of concentrated installation solenoid valve, reduce the power and the control scheme of every solenoid valve, improve work efficiency, make things convenient for subsequent maintenance work, reform transform the upgrading.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided by the present invention, it should be understood that the disclosed system and method can be implemented in other ways. For example, the above-described system embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims (9)

1. The gas turbine intake back flushing control method is characterized by comprising the following steps of:
obtaining a blowback start threshold omega1Back-blowing stop threshold omega2And a blowback duration t;
acquiring the pressure difference delta P between the inner side of the air filter and the outer side of the air filter;
judging whether the pressure difference delta P is at the back flushing starting threshold value omega or not according to the pressure difference delta P1Within the range;
when the pressure difference delta P is larger than the back flushing starting threshold value omega1If so, starting back flushing, sequentially conducting back flushing valves to carry out back flushing during back flushing, and simultaneously starting all back flushing valves to carry out back flushing once after the back flushing is finished;
after the back blowing is finished, the pressure difference delta P 'between the inner side of the air filter and the outer side of the air filter is obtained again, and if the pressure difference delta P' is larger than a back blowing stopping threshold omega2If so, continuing to start back flushing, sequentially conducting back flushing valves to back flush during back flushing, and simultaneously starting all back flushing valves to back flush after the back flushing is finished;
after the back blowing is finished, the pressure difference delta P between the inner side of the air filter and the outer side of the air filter is obtained again, and if the pressure difference delta P is smaller than the pressure difference delta P, the pressure difference delta P is obtained again "Still greater than the blowback stop threshold ω2If so, sending an error reporting signal and applying for human intervention; if the pressure difference delta P' is smaller than the back flushing stopping threshold omega2If so, the back flushing is finished;
obtaining the back-flushing start threshold value omega1Back-blowing stop threshold omega2Comprising:
in the working process of the gas turbine, testing the working efficiency eta corresponding to the gas turbine under different pressure difference delta P, and obtaining that the working efficiency eta corresponding to the gas turbine is gradually reduced along with the increase of the pressure difference delta P;
according to two adjacent working efficiencies eta1、η2Obtaining two corresponding pressure difference delta P1、ΔP2And calculating the slope k:
Figure 853680DEST_PATH_IMAGE002
let the point at which the absolute value of the slope is maximum be kmaxCalculating kmaxTwo of said working efficiencies η being adjacent in timemax1And ηmax2Corresponding pressure difference Δ Pmax1And Δ Pmax2(ii) a And the pressure difference DeltaPmax1As a blowback stop threshold ω2Will be the pressure difference Δ Pmax2As a blowback start threshold ω1A value of (d);
wherein, the working efficiency eta1Greater than the working efficiency eta2(ii) a Pressure difference Δ P1<Pressure difference Δ P2(ii) a Back flushing stop threshold omega2<Back flushing start threshold omega1(ii) a Pressure difference Δ Pmax1<Pressure difference Δ Pmax2。
2. The gas turbine intake blowback control method of claim 1, wherein the blowback duration t is set according to an actual usage environment, including an ambient humidity and an oil content in air, and the blowback duration is in a proportional relationship with the ambient humidity and the oil content in air.
3. The gas turbine intake blowback control method of claim 1, wherein during blowback, the sequence of the blowback valve openings is from top to bottom, and during blowback, meter wind is used.
4. The gas turbine intake blowback control method of claim 1, wherein after human intervention, the sequence of the blowback valves can be controlled by manual control, and the blowback duration can be adjusted.
5. A gas turbine intake blowback control system, comprising:
the PLC acquires a back-blowing starting threshold value and a back-blowing stopping threshold value, and is used for generating starting and stopping back-blowing control signals according to the back-blowing starting threshold value, the back-blowing stopping threshold value and the pressure difference between the inner side and the outer side of the air filter, wherein the back-blowing starting threshold value omega is acquired1Back-blowing stop threshold omega2Comprising:
in the working process of the gas turbine, testing the working efficiency eta corresponding to the gas turbine under different pressure difference delta P, and obtaining that the working efficiency eta corresponding to the gas turbine is gradually reduced along with the increase of the pressure difference delta P;
according to two adjacent working efficiencies eta1、η2Obtaining two corresponding pressure difference delta P1、ΔP2And calculating the slope k:
Figure DEST_PATH_IMAGE004
let the point at which the absolute value of the slope is maximum be kmaxCalculating kmaxTwo of said working efficiencies η being adjacent in timemax1And ηmax2Corresponding pressure difference Δ Pmax1And Δ Pmax2(ii) a And the pressure difference DeltaPmax1As a blowback stop threshold ω2Will be the pressure difference Δ Pmax2As a blowback start threshold ω1A value of (d);
wherein the work effectRate eta1Greater than the working efficiency eta2(ii) a Pressure difference Δ P1<Pressure difference Δ P2(ii) a Back flushing stop threshold omega2<Back flushing start threshold omega1(ii) a Pressure difference Δ Pmax1<Pressure difference Δ Pmax2；
The control module is used for outputting an error reporting indication signal, feeding back the duration of back flushing, and receiving a signal controlled by the PLC for signal retransmission;
the data acquisition module is used for acquiring pressure differences delta P, delta P 'and delta P' between the inner side and the outer side of the air filter;
the timing module is used for recording and feeding back the back flushing time;
the output module is used for outputting a control signal and controlling the on-off of the back flushing valve;
the power supply module is used for providing required electric energy for the normal operation of each module in the system;
the LED error reporting indicating module receives an error reporting indicating signal sent by the control module and converts the received signal into an LED optical signal for indicating;
the switching value input module is used for converting an input switching signal into a low-voltage signal inside the PLC and realizing the electrical isolation of signals inside and outside the PLC;
the manual control module is used for carrying out back flushing adjustment in a way of manually controlling back flushing when the back flushing effect is not ideal;
and the communication module is used for connecting the PLC with the control module and transmitting data and signals.
6. The gas turbine intake blowback control system of claim 5, wherein said PLC controller includes a storage module for storing said blowback activation threshold ω1The back-blowing stop threshold value omega2And the blowback duration t.
7. The gas turbine intake blowback control system of claim 5, wherein the data acquisition module is a differential pressure switch, and the differential pressure switch is connected to the PLC controller, the differential pressure switch being configured to acquire a pressure difference between an inside and an outside of the air filter.
8. The gas turbine intake blowback control system of claim 5, wherein the communication module is connected to the PLC controller and the control module respectively and supports dual redundant communication, ensuring stable data transmission between the PLC controller and the control module.
9. A computer-readable medium, in which a computer program is stored which, when being processed and executed, carries out the steps of the method according to any one of claims 1 to 4.
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