CN112832911B - Method and device for reducing nitrogen oxide emission of two-driving-one combined cycle unit - Google Patents
Method and device for reducing nitrogen oxide emission of two-driving-one combined cycle unit Download PDFInfo
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- CN112832911B CN112832911B CN202110007457.5A CN202110007457A CN112832911B CN 112832911 B CN112832911 B CN 112832911B CN 202110007457 A CN202110007457 A CN 202110007457A CN 112832911 B CN112832911 B CN 112832911B
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Abstract
The invention discloses a method and a device for reducing nitrogen oxide emission of a two-driving-one combined cycle unit, wherein the method comprises the following steps: acquiring a time sample with load deviation smaller than a first preset value from historical data of operation of a two-to-one combined cycle unit; selecting a stable load time period according to a first preset interval in the time samples; splitting the stable load time period, and establishing a discrete load matrix, wherein the discrete load matrix takes a second preset value as a load interval; setting correction parameters and drawing a load-nitrogen oxide emission curve according to the discrete load matrix; and calculating a bias point with the minimum nitrogen oxide emission of the two-in-one combined cycle unit according to the curve. Can be through obtaining historical operating condition, look for the gas turbine nitrogen oxide to discharge and the comprehensive benefit point of denitration efficiency optimization, reduce unit nitrogen oxide and discharge, promote denitration efficiency, realize environmental protection economic nature and environmental protection security's multiple promotion.
Description
Technical Field
The invention relates to the field of automation, in particular to a method and a device for reducing nitrogen oxide emission of a two-driving-one combined cycle unit.
Background
The combustion engine can generate some pollution gases such as nitrogen oxides during operation, the discharge amount of the nitrogen oxides is mainly influenced by the combustion characteristics of the combustion engine, and as the service life of the combustion engine is prolonged, the loss of hot parts is increased, and A-CPFM (automatic combustion adjustment) adjustment is intervened, the load-nitrogen oxide discharge curve of the combustion engine can correspondingly change without a fixed rule. For the combined cycle unit, the load-nitrogen oxide emission curves of the two combustion engines cannot be completely the same due to different installation, starting and stopping frequency and different experienced working conditions. When two combustion engines are in one-to-one operation, the optimal environmental protection parameters cannot be determined.
In order to reduce the denitration efficiency of the unit, some power generation companies adopt a certain load offset of the combustion engine to reduce the emission of nitrogen oxides of the whole unit. However, the offset acquisition process is complex, and along with asymmetric gas filter screen difference, intake filter screen difference, combustion pipeline arrangement difference, unit start-stop frequency, unit operation time difference, unit heat component replacement condition difference and the like of the two combustion engines, the operation efficiency curves of the two combustion engines cannot be guaranteed to be unchanged, the fixed load offset cannot guarantee that the unit nitrogen oxide emission level is optimal, and even when the unit load changes, the denitration efficiency is further reduced due to non-timely adjustment. It can therefore be assumed that increasing the appropriate load offset makes it possible to reduce nox emissions while ensuring that the total output load remains unchanged, while a wrong offset adjustment makes it possible to cause a rise in the plant nox emissions, even with safety and environmental risks. Because the condition of the unit changes at any time along with the operation, factors influencing the efficiency of the unit are numerous, and the reasonable offset set value is difficult to obtain from experience or mathematical analysis.
Disclosure of Invention
The embodiment of the invention provides a method and a device for reducing nitrogen oxide emission of a two-drive-one combined cycle unit, and aims to solve the problems that in the prior art, the setting of the load offset of a combustion engine is difficult to obtain through empirical or mathematical analysis, and the set load offset of the combustion engine cannot ensure that the nitrogen oxide emission of the unit is relatively excellent.
In order to solve the technical problem, the invention is realized as follows:
in a first aspect, a method for reducing nitrogen oxide emissions from a two-drive-one combined cycle unit is provided, comprising:
acquiring a time sample with load deviation smaller than a first preset value from historical data of operation of a two-to-one combined cycle unit;
selecting a stable load time period according to a first preset interval in the time samples;
splitting the stable load time period, and establishing a discrete load matrix, wherein the discrete load matrix takes a second preset value as a load interval;
setting correction parameters and drawing a load-nitrogen oxide emission curve according to the discrete load matrix;
and calculating a bias point with the minimum nitrogen oxide emission of the two-in-one combined cycle unit according to the curve.
In a second aspect, an apparatus for reducing nitrogen oxide emissions from a two-drive-one combined cycle plant is provided, comprising:
the acquisition module is used for acquiring a time sample with the load deviation smaller than a first preset value from historical data of the operation of the two-in-one combined cycle unit;
the selecting module is used for selecting a stable load time period according to a first preset interval in the time samples;
the establishing module is used for splitting the stable load time period and establishing a discrete load matrix, wherein the discrete load matrix takes a second preset value as a load interval;
the drawing module is used for setting correction parameters and drawing a load-nitrogen oxide emission curve according to the discrete load matrix;
and the calculation module is used for calculating a bias point with the minimum nitrogen oxide emission of the two-driving-one combined cycle unit according to the curve.
In a third aspect, an electronic device is provided, comprising a processor, a memory and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the method according to the first aspect.
In a fourth aspect, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the method according to the first aspect.
In the embodiment of the invention, firstly, a time sample with the load deviation smaller than a first preset value is obtained from historical data of the operation of a two-drive-one combined cycle unit; selecting a stable load time period according to a first preset interval in the time samples; splitting the stable load time period to establish a discrete load matrix; setting correction parameters and drawing a load-nitrogen oxide emission curve according to the discrete load matrix; and calculating the offset point with the minimum nitrogen oxide emission of the two-in-one combined cycle unit according to the curve. In this application embodiment, can be through obtaining historical operating condition, look for the comprehensive benefit point that gas turbine nitrogen oxide discharged and denitration efficiency optimization, reduce unit nitrogen oxide and discharge, promote denitration efficiency, realize environmental protection economic nature and environmental protection security's multiple promotion.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, 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 flow chart of a method for reducing nitrogen oxide emissions from a two-to-one combined cycle unit in accordance with an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an apparatus for reducing nitrogen oxide emissions from a two-drive-one combined cycle unit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a hardware structure of an electronic device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The method and the device for reducing nitrogen oxide emissions of a two-drive-one combined cycle unit provided by the embodiment of the present application are described in detail through specific embodiments and application scenarios thereof with reference to the accompanying drawings.
Referring to fig. 1, a flowchart of a method for reducing nox emissions of a two-drive-one combined cycle unit according to an embodiment of the present invention is shown, where the method for reducing nox emissions of a two-drive-one combined cycle unit according to fig. 1 may include: the contents shown in step S101 to step S105.
In step S101, a time sample with a load deviation smaller than a first preset value is obtained from historical data of the operation of the two-to-one combined cycle unit.
Specifically, the time period of stable load can be screened at intervals of a first preset value from historical operation data, and a basic database is established. The first preset value may be a value set according to actual conditions, for example, 2 MW.
In step S102, a stable load time period is selected at a first preset interval in the time samples.
In the embodiment of the application, on the basis of the acquired time samples, each first preset interval takes a first preset value as an interval from a certain past time period, a time period for stabilizing the load is screened, and the basic database is continuously expanded. The recent data can be obtained through the operation, and the updating of the stable load database is guaranteed.
Specifically, the period of stable load can be screened every 1 hour from the last 6 hours at intervals of 2 MW.
In step S103, the stable load time period is divided, and a discrete load matrix is established.
And the discrete load matrix takes a second preset value as a load interval.
In step S104, correction parameters are set and a load-nitrogen oxide emission curve is drawn according to the discrete load matrix.
In step S105, an offset point at which NOx emission of the two-to-one combined cycle plant is minimized is calculated based on the curve.
In the embodiment of the invention, firstly, a time sample with the load deviation smaller than a first preset value is obtained from historical data of the operation of a two-drive-one combined cycle unit; selecting a stable load time period according to a first preset interval in the time samples; splitting the stable load time period to establish a discrete load matrix; setting correction parameters and drawing a load-nitrogen oxide emission curve according to the discrete load matrix; and calculating the offset point with the minimum nitrogen oxide emission of the two-in-one combined cycle unit according to the curve. In this application embodiment, can be through obtaining historical operating condition, look for the comprehensive benefit point that gas turbine nitrogen oxide discharged and denitration efficiency optimization, reduce unit nitrogen oxide and discharge, promote denitration efficiency, realize environmental protection economic nature and environmental protection security's multiple promotion.
In a possible embodiment of the present invention, splitting the stable load time period to establish the discrete load matrix may include the following steps.
Splitting the stable load time period into time periods with preset time lengths; calculating the environmental temperature, pressure, humidity, heat value and nitrogen oxide emission in each time period; removing repeated data in a plurality of time periods; and establishing a discrete load matrix with a second preset value load interval according to the data with the repeated data removed.
Specifically, since the load is acquired at intervals of 2MW, but when used, the classification needs to be further refined according to the average load, so that the 0.5MW interval is adopted here. The data screened by the method has various samples at the same load interval, and the steps correspond to different environmental temperatures, heat values and gas flows, and the related parameters jointly form matrix data belonging to the load interval range for later calculation. And the matrix is an important basis for later calculation.
In one possible embodiment of the invention, setting the correction parameters and plotting the load-nox emission curve according to the discrete load matrix may comprise the following steps.
According to the discrete load matrix, respectively setting a group of different values for the two combustion engines, wherein the values comprise an environmental temperature value and a heat value; determining a correction parameter according to different data; acquiring the gas flow of the current environmental parameter from the discrete load matrix by using the correction parameter; and (4) drawing a load-nitrogen oxide emission curve according to the gas flow.
Since the matrix obtained by the above steps does not necessarily support the current load to make a left and right load bias determination, it is necessary to set the influence degree of the correlation correction parameter on the temperature and the heat value on the load efficiency to be assumed. Specifically, for the load matrix obtained in the above steps, assuming that one set of the load matrix corresponds to an ambient temperature of 25, a calorific value of 35, another set of the load matrix corresponds to an ambient temperature of 20, a calorific value of 35, and a difference in gas flow rate, a correction parameter may be obtained by the difference to act on the determination of the current parameter. However, the influence of the ambient temperature and the influence of the calorific value have different weights, and the correction coefficient is also different, and thus it is necessary to set the correction coefficient at random. The weight is introduced in a random number mode, and the effect after the actual setting and the offset is used as feedback verification. In the middle, a user needs to set according to system instructions, and then judges according to the result fed back actually to judge whether the correction meets the requirements.
In one possible embodiment of the present invention, calculating the offset point at which nox emissions from the two-to-one combined cycle plant are minimized based on the curve may include the following steps.
Simulating the work of two combustion engines on the curve according to the curve, wherein one combustion engine increases the load, and the other combustion engine decreases the load; calculating a bias point with minimum total nitrogen oxide emission when the two combustion engines work; the minimum bias point is set to the optimal load bias point.
In one possible embodiment of the present invention, the method for reducing nitrogen oxide emissions of a two-to-one combined cycle unit may further include: and if the environmental factors or the load changes, recalculating the offset point of the two-in-one combined cycle unit with the minimum nitrogen oxide emission, wherein the environmental factors comprise the environmental temperature, the pressure, the humidity, the heat value and the nitrogen oxide emission.
That is, the minimum offset point calculated as described above can be corrected at any time according to the environmental change. The hidden danger of the unit can be found by finding the efficiency deviation of the gas turbine in time, and the environmental protection accidents are avoided.
The invention also provides a device for reducing nitrogen oxide emission of a two-in-one combined cycle unit, as shown in fig. 2, the device can comprise: the system comprises an acquisition module 201, a selection module 202, a building module 203, a drawing module 204 and a calculation module 205.
Specifically, the obtaining module 201 is configured to obtain a time sample with a load deviation smaller than a first preset value from historical data of operation of a two-drive-one combined cycle unit; the selecting module 202 is configured to select a stable load time period according to a first preset interval in the time samples; the establishing module 203 is configured to split the stable load time period and establish a discrete load matrix, where the discrete load matrix takes a second preset value as a load interval; the drawing module 204 is used for setting correction parameters and drawing a load-nitrogen oxide emission curve according to the discrete load matrix; the calculation module 205 is configured to calculate a bias point at which nox emission of the two-to-one combined cycle plant is minimum according to the curve.
In the embodiment of the application, firstly, the obtaining module 201 obtains a time sample with a load deviation smaller than a first preset value from historical data of the operation of a two-drive-one combined cycle unit; in the time samples, the selection module 202 selects a stable load time period according to a first preset interval; the establishing module 203 splits the stable load time period to establish a discrete load matrix; the drawing module 204 sets correction parameters and draws a load-nitrogen oxide emission curve according to the discrete load matrix; the calculation module 205 calculates a bias point for the two-to-one combined cycle plant having the minimum nox emission based on the curve. In this application embodiment, can be through obtaining historical operating condition, look for the comprehensive benefit point that gas turbine nitrogen oxide discharged and denitration efficiency optimization, reduce unit nitrogen oxide and discharge, promote denitration efficiency, realize environmental protection economic nature and environmental protection security's multiple promotion.
Optionally, the establishing module 204 may be configured to: splitting the stable load time period into time periods with preset time lengths; calculating the environmental temperature, pressure, humidity, heat value and nitrogen oxide emission in each time period; removing repeated data in a plurality of time periods; and establishing a discrete load matrix with a second preset value load interval according to the data with the repeated data removed.
Optionally, the rendering module 204 may be configured to: according to the discrete load matrix, respectively setting a group of different values for the two combustion engines, wherein the values comprise an environmental temperature value and a heat value; determining a correction parameter according to different data; acquiring the gas flow of the current environmental parameter from the discrete load matrix by using the correction parameter; and (4) drawing a load-nitrogen oxide emission curve according to the gas flow.
Optionally, the calculating module 205 is configured to: simulating the work of two combustion engines on the curve according to the curve, wherein one combustion engine increases the load, and the other combustion engine decreases the load; calculating a bias point with minimum total nitrogen oxide emission when the two combustion engines work; the minimum bias point is set to the optimal load bias point.
Optionally, the apparatus for reducing nitrogen oxide emissions of a two-drive-one combined cycle unit may further include: and a correction module.
Specifically, the correction module may be configured to recalculate the offset point at which the nox emission of the two-drive-one combined cycle unit is minimum if the environmental factors or the load changes, where the environmental factors include an ambient temperature, a pressure, a humidity, a heat value, and an nox emission.
The apparatus for reducing nitrogen oxide emissions of a two-drive-one combined cycle unit provided in this embodiment may refer to a process flow for executing the method shown in fig. 1, and each unit/module and the other operations and/or functions in the apparatus are respectively for implementing a corresponding process flow in the method for reducing nitrogen oxide emissions of a two-drive-one combined cycle unit shown in fig. 1, and may achieve the same or equivalent technical effects, and for brevity, no further description is provided herein.
Fig. 3 is a schematic diagram of a hardware structure of an electronic device implementing various embodiments of the present invention.
The electronic device 400 includes, but is not limited to: radio frequency unit 401, network module 402, audio output unit 403, input unit 404, sensor 405, display unit 406, user input unit 407, interface unit 408, memory 409, processor 410, and power supply 411. Those skilled in the art will appreciate that the electronic device configuration shown in fig. 3 does not constitute a limitation of the electronic device, and that the electronic device may include more or fewer components than shown, or combine certain components, or a different arrangement of components. In the embodiment of the present invention, the electronic device includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted terminal, a wearable device, a pedometer, and the like.
Wherein, the processor 410 may be configured to: acquiring a time sample with load deviation smaller than a first preset value from historical data of operation of a two-to-one combined cycle unit; selecting a stable load time period according to a first preset interval in the time samples; splitting the stable load time period, and establishing a discrete load matrix, wherein the discrete load matrix takes a second preset value as a load interval; setting correction parameters and drawing a load-nitrogen oxide emission curve according to the discrete load matrix; and calculating the offset point with the minimum nitrogen oxide emission of the two-in-one combined cycle unit according to the curve.
In the embodiment of the application, firstly, a time sample with the load deviation smaller than a first preset value is obtained from historical data of the operation of a two-in-one combined cycle unit; selecting a stable load time period according to a first preset interval in the time samples; splitting the stable load time period to establish a discrete load matrix; setting correction parameters and drawing a load-nitrogen oxide emission curve according to the discrete load matrix; and calculating the offset point with the minimum nitrogen oxide emission of the two-in-one combined cycle unit according to the curve. In this application embodiment, can be through obtaining historical operating condition, look for the comprehensive benefit point that gas turbine nitrogen oxide discharged and denitration efficiency optimization, reduce unit nitrogen oxide and discharge, promote denitration efficiency, realize environmental protection economic nature and environmental protection security's multiple promotion.
It should be understood that, in the embodiment of the present invention, the radio frequency unit 401 may be used for receiving and sending signals during a message sending and receiving process or a call process, and specifically, receives downlink data from a base station and then processes the received downlink data to the processor 410; in addition, the uplink data is transmitted to the base station. Typically, radio unit 401 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. Further, the radio unit 401 can also communicate with a network and other devices through a wireless communication system.
The electronic device provides wireless broadband internet access to the user via the network module 402, such as assisting the user in sending and receiving e-mails, browsing web pages, and accessing streaming media.
The audio output unit 403 may convert audio data received by the radio frequency unit 401 or the network module 402 or stored in the memory 409 into an audio signal and output as sound. Also, the audio output unit 403 may also provide audio output related to a specific function performed by the electronic apparatus 400 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 403 includes a speaker, a buzzer, a receiver, and the like.
The input unit 404 is used to receive audio or video signals. The input Unit 404 may include a Graphics Processing Unit (GPU) 4041 and a microphone 4042, and the Graphics processor 4041 processes image data of a still picture or video obtained by an image capturing apparatus (such as a camera) in a video capturing mode or an image capturing mode. The processed image frames may be displayed on the display unit 406. The image frames processed by the graphic processor 4041 may be stored in the memory 409 (or other storage medium) or transmitted via the radio frequency unit 401 or the network module 402. The microphone 4042 may receive sound, and may be capable of processing such sound into audio data. The processed audio data may be converted into a format output transmittable to a mobile communication base station via the radio frequency unit 401 in case of the phone call mode.
The electronic device 400 also includes at least one sensor 405, such as light sensors, motion sensors, and other sensors. Specifically, the light sensor includes an ambient light sensor that adjusts the brightness of the display panel 4061 according to the brightness of ambient light, and a proximity sensor that turns off the display panel 4061 and/or the backlight when the electronic apparatus 400 is moved to the ear. As one type of motion sensor, an accelerometer sensor can detect the magnitude of acceleration in each direction (generally three axes), detect the magnitude and direction of gravity when stationary, and can be used to identify the posture of an electronic device (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), and vibration identification related functions (such as pedometer, tapping); the sensors 405 may also include a fingerprint sensor, a pressure sensor, an iris sensor, a molecular sensor, a gyroscope, a barometer, a hygrometer, a thermometer, an infrared sensor, etc., which will not be described in detail herein.
The display unit 406 is used to display information input by the user or information provided to the user. The Display unit 406 may include a Display panel 4061, and the Display panel 4061 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like.
The user input unit 407 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the electronic device. Specifically, the user input unit 407 includes a touch panel 4071 and other input devices 4072. Touch panel 4071, also referred to as a touch screen, may collect touch operations by a user on or near it (e.g., operations by a user on or near touch panel 4071 using a finger, a stylus, or any suitable object or attachment). The touch panel 4071 may include two parts, a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 410, receives a command from the processor 410, and executes the command. In addition, the touch panel 4071 can be implemented by using various types such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. In addition to the touch panel 4071, the user input unit 407 may include other input devices 4072. Specifically, the other input devices 4072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a track ball, a mouse, and a joystick, which are not described herein again.
Further, the touch panel 4071 can be overlaid on the display panel 4061, and when the touch panel 4071 detects a touch operation thereon or nearby, the touch operation is transmitted to the processor 410 to determine the type of the touch event, and then the processor 410 provides a corresponding visual output on the display panel 4061 according to the type of the touch event. Although in fig. 3, the touch panel 4071 and the display panel 4061 are two independent components to implement the input and output functions of the electronic device, in some embodiments, the touch panel 4071 and the display panel 4061 may be integrated to implement the input and output functions of the electronic device, which is not limited herein.
The interface unit 408 is an interface for connecting an external device to the electronic apparatus 400. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The interface unit 408 may be used to receive input (e.g., data information, power, etc.) from an external device and transmit the received input to one or more elements within the electronic apparatus 400 or may be used to transmit data between the electronic apparatus 400 and an external device.
The memory 409 may be used to store software programs as well as various data. The memory 409 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 409 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.
The processor 410 is a control center of the electronic device, connects various parts of the entire electronic device using various interfaces and lines, performs various functions of the electronic device and processes data by operating or executing software programs and/or modules stored in the memory 409 and calling data stored in the memory 409, thereby performing overall monitoring of the electronic device. Processor 410 may include one or more processing units; preferably, the processor 410 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 410.
The electronic device 400 may further include a power supply 411 (e.g., a battery) for supplying power to various components, and preferably, the power supply 411 may be logically connected to the processor 410 through a power management system, so as to implement functions of managing charging, discharging, and power consumption through the power management system.
In addition, the electronic device 400 includes some functional modules that are not shown, and are not described in detail herein.
Preferably, an embodiment of the present invention further provides an electronic device, which includes a processor 410, a memory 409, and a computer program stored in the memory 409 and capable of being executed on the processor 410, where the computer program, when executed by the processor 410, implements each process of the above-mentioned method embodiment for reducing nitrogen oxide emissions of a two-to-one combined cycle unit, and can achieve the same technical effect, and in order to avoid repetition, it is not described herein again.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the above-mentioned method for reducing nitrogen oxide emission of a two-drive-one combined cycle unit, and can achieve the same technical effect, and is not described herein again to avoid repetition. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A method of reducing nitrogen oxide emissions from a two-to-one combined cycle unit, comprising:
acquiring a time sample with load deviation smaller than a first preset value from historical data of operation of a two-to-one combined cycle unit;
selecting a stable load time period according to a first preset interval in the time samples;
splitting the stable load time period, and establishing a discrete load matrix, wherein the discrete load matrix takes a second preset value as a load interval;
setting correction parameters and drawing a load-nitrogen oxide emission curve according to the discrete load matrix;
calculating a bias point with minimum nitrogen oxide emission of the two-in-one combined cycle unit according to the curve;
setting correction parameters and drawing a load-nitrogen oxide emission curve according to the discrete load matrix, wherein the method comprises the following steps:
setting a group of different values for each of the two combustion engines according to the discrete load matrix, wherein the values comprise an environmental temperature value and a heat value;
determining a correction parameter based on said different data;
acquiring the gas flow of the current environmental parameter from the discrete load matrix by using the correction parameter;
and drawing a load-nitrogen oxide emission curve according to the gas flow.
2. The method of claim 1, wherein splitting the steady load time period to create a discrete load matrix comprises:
splitting the stable load time period into a time period with preset duration;
calculating the environmental temperature, pressure, humidity, heat value and nitrogen oxide emission in each time period;
removing repeated data in a plurality of time periods;
and establishing a discrete load matrix with a second preset value load interval according to the data with the repeated data removed.
3. The method of claim 1, wherein said calculating a bias point for minimum nox emissions from the two-to-one combined cycle plant based on the curve comprises:
simulating the work of the two combustion engines on the curve according to the curve, wherein one combustion engine increases the load, and the other combustion engine decreases the load;
calculating a bias point with minimum total nitrogen oxide emission when the two combustion engines work;
setting the minimum bias point as an optimal load bias point.
4. The method of claim 1, further comprising:
and if the environmental factors or the load changes, recalculating the offset point of the two-driving-one combined cycle unit with the minimum nitrogen oxide emission, wherein the environmental factors comprise the environmental temperature, the pressure, the humidity, the heat value and the nitrogen oxide emission.
5. An apparatus for reducing nitrogen oxide emissions from a two-to-one combined cycle unit, comprising:
the acquisition module is used for acquiring a time sample with the load deviation smaller than a first preset value from historical data of the operation of the two-in-one combined cycle unit;
the selecting module is used for selecting a stable load time period according to a first preset interval in the time samples;
the establishing module is used for splitting the stable load time period and establishing a discrete load matrix, wherein the discrete load matrix takes a second preset value as a load interval;
the drawing module is used for setting correction parameters and drawing a load-nitrogen oxide emission curve according to the discrete load matrix;
the calculation module is used for calculating a bias point with the minimum nitrogen oxide emission of the two-driving-one combined cycle unit according to the curve;
the drawing module is configured to:
setting a group of different values for each of the two combustion engines according to the discrete load matrix, wherein the values comprise an environmental temperature value and a heat value;
determining a correction parameter based on said different data;
acquiring the gas flow of the current environmental parameter from the discrete load matrix by using the correction parameter;
and drawing a load-nitrogen oxide emission curve according to the gas flow.
6. The apparatus of claim 5, wherein the establishing module is configured to:
splitting the stable load time period into a time period with preset duration;
calculating the environmental temperature, pressure, humidity, heat value and nitrogen oxide emission in each time period;
removing repeated data in a plurality of time periods;
and establishing a discrete load matrix with a second preset value load interval according to the data with the repeated data removed.
7. The apparatus of claim 5, wherein the computing module is configured to:
simulating the work of the two combustion engines on the curve according to the curve, wherein one combustion engine increases the load, and the other combustion engine decreases the load;
calculating a bias point with minimum total nitrogen oxide emission when the two combustion engines work;
setting the minimum bias point as an optimal load bias point.
8. The apparatus of claim 5, further comprising:
and the correction module is used for recalculating the bias point with the minimum nitrogen oxide emission of the two-driving-one combined cycle unit if the environmental factors or the load change, wherein the environmental factors comprise the environmental temperature, the pressure, the humidity, the heat value and the nitrogen oxide emission.
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Address after: 3 liyuanli, Chaoyang District, Beijing 100025 Patentee after: China Shenhua Energy Co.,Ltd. Guohua Power Branch Patentee after: Guoneng Guohua (Beijing) gas thermal power Co., Ltd Address before: 3 liyuanli, Chaoyang District, Beijing 100025 Patentee before: China Shenhua Energy Co.,Ltd. Guohua Power Branch Patentee before: Shenhua Guohua (Beijing) gas thermal power Co., Ltd |