CN117054014A - Air leakage monitoring method and equipment for air preheater - Google Patents
Air leakage monitoring method and equipment for air preheater Download PDFInfo
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- CN117054014A CN117054014A CN202311152394.8A CN202311152394A CN117054014A CN 117054014 A CN117054014 A CN 117054014A CN 202311152394 A CN202311152394 A CN 202311152394A CN 117054014 A CN117054014 A CN 117054014A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 25
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000003546 flue gas Substances 0.000 claims abstract description 34
- 239000000779 smoke Substances 0.000 claims abstract description 26
- 230000005540 biological transmission Effects 0.000 claims description 22
- 238000012937 correction Methods 0.000 claims description 10
- 230000003068 static effect Effects 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000012806 monitoring device Methods 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
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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
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention relates to the technical field of air pre-heaters, in particular to an air pre-heater air leakage monitoring method and equipment, wherein the method comprises the following steps: acquiring primary air quantity Q 1 Secondary air quantity Q 2 Smoke quantity Q 0 Air pressure p at outlet of primary fan 1 Outlet wind pressure p of secondary fan 2 Primary fan electric power P 1 And secondary air motor power P 2 The method comprises the steps of carrying out a first treatment on the surface of the According to the data, the air leakage quantity Q of the primary air direction secondary air bin is calculated △1 Primary air leakage rate delta 1 Leakage air quantity Q of secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 The method comprises the steps of carrying out a first treatment on the surface of the Outputting the calculated data and the air leakage quantity Q of the primary air direction secondary air bin △1 Primary air leakage rate delta 1 Leakage air quantity Q of secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 And sending the cloud platform to the Internet of things cloud platform. Real-time monitoring is carried out on the state of the air preheater of the power plant so as toOperators and technicians can monitor and analyze the state of the air preheater timely and accurately, and overhaul is arranged according to the state.
Description
Technical Field
The invention relates to the technical field of air pre-heaters, and particularly provides an air pre-heater air leakage monitoring method and equipment.
Background
The oxygen measuring points are arranged at the front and the back of the domestic boiler air preheater, and the air leakage rate of the air preheater can be calculated by utilizing the front and the back oxygen amount of the air preheater. However, the installation position of the oxygen measuring point is limited by the on-site installation condition, so that a turbulent flow area cannot be avoided, and particularly the oxygen measuring point behind the air preheater can be influenced by local air leakage. Therefore, the mode of converting the air leakage rate of the air preheater by utilizing the front and rear oxygen measuring points of the air preheater is usually too large in error, the state of the air preheater cannot be accurately monitored, and the mode of periodically adding the test measuring points to measure the air leakage rate of the air preheater cannot be monitored in real time. And the primary air leakage quantity and the secondary air leakage quantity of the air preheater cannot be respectively monitored in the two modes, so that the air leakage position of the air preheater cannot be evaluated relatively accurately.
Disclosure of Invention
In order to overcome the defects, the invention provides a device for solving the technical problems that the air leakage monitoring error of the air preheater is large and the air leakage monitoring cannot be monitored in real time in the prior art.
In a first aspect, the present invention provides a method for monitoring air leakage of an air preheater, comprising the steps of:
acquiring primary air quantity Q 1 Secondary air quantity Q 2 Smoke quantity Q 0 Air pressure p at outlet of primary fan 1 Outlet wind pressure p of secondary fan 2 Primary fan electric power P 1 And secondary air motor power P 2 ；
According to the primary air quantity Q 1 Smoke quantity Q 0 Air pressure p at outlet of primary fan 1 And primary fan electric power P 1 Calculating to obtain the air leakage quantity Q of the primary air direction secondary air bin △1 And the primary air leakage rate delta 1 According to the secondary air quantity Q 2 Smoke quantity Q 0 Outlet wind pressure p of secondary fan 2 Electric power P of secondary air machine 2 And the air leakage quantity Q of the primary air direction secondary air bin △1 Calculating to obtain the air leakage quantity Q of the secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 ；
Outputting the air leakage quantity Q of the primary air direction secondary air bin △1 Primary air leakage rate delta 1 Leakage air quantity Q of secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 ；
The air leakage quantity Q of the primary air direction secondary air bin △1 Primary air leakage rate delta 1 Leakage air quantity Q of secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 And sending the cloud platform to the Internet of things cloud platform.
Further, the method comprises the steps of:
the DCS system receives the air leakage quantity Q of the primary air direction secondary air bin △1 Primary air leakage rate delta 1 Leakage air quantity Q of secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 。
Further, according to the primary air quantity Q 1 Smoke quantity Q 0 Air pressure p at outlet of primary fan 1 And primary fan electric power P 1 Calculating to obtain the air leakage quantity Q of the primary air direction secondary air bin △1 And the primary air leakage rate delta 1 Comprising:
according to the outlet wind pressure p of the primary fan 1 Calculating to obtain a primary fan compressibility correction coefficient K p1 ；
Definition of Primary air System efficiency η 1 Is the product of the motor efficiency, the transmission efficiency and the fan efficiency of the primary fan, namelyWherein P is e1 Represents the effective power of the primary fan, P 1 Representing the electric power of the primary fan;
determining the efficiency eta of the primary air fan system according to the regulation mode of the primary air fan 1 ；
Definition of Primary air Fan effective Power P e1 ＝Q 10 ×p 10 ÷3.6×105×K p1 Wherein Q is 10 Represents the total output air quantity of the primary fan, p 10 Represents the lift, K of the primary fan p1 Representing the compressibility correction coefficient of the primary air fan;
according to the outlet wind pressure p of the primary fan 1 Determining the lift p of the primary fan 10 ；
Calculating to obtain the total output air quantity of the primary fan
Calculating to obtain the air leakage quantity Q of the primary air direction secondary air bin △1 ＝Q 10 -Q 1 ；
Calculating to obtain the primary air leakage rate delta 1 ＝Q △1 ÷Q 0 。
Further, the primary air fan system efficiency eta is determined according to the regulation mode of the primary air fan 1 Comprising:
judging whether the primary fan is subjected to variable frequency adjustment or movable blade and static blade adjustment;
if the primary air blower is frequency conversion regulation, obtaining the primary air blower system efficiency eta according to the product of the motor efficiency, the transmission efficiency and the fan efficiency of the primary air blower 1 ；
If the primary fan is regulated by a movable blade stationary blade, acquiring a functional relation between the fan efficiency of the primary fan and the wind pressure of a fan outlet, and obtaining the system efficiency eta of the primary fan according to the product of the motor efficiency, the transmission efficiency and the fan efficiency of the primary fan 1 。
Further, according to the secondary air quantity Q 2 Smoke quantity Q 0 Outlet wind pressure p of secondary fan 2 Electric power P of secondary air machine 2 And the air leakage quantity Q of the primary air direction secondary air bin △1 Calculating to obtain the air leakage quantity Q of the secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 Comprising:
according to the outlet wind pressure p of the secondary air blower 2 Calculating to obtain a compressibility correction coefficient K of the secondary air machine p2 ；
Definition of Secondary air blower System efficiency η 2 Is the product of the motor efficiency, the transmission efficiency and the fan efficiency of the secondary fan, namelyWherein P is e2 Representing the effective power of the secondary air blower, P 2 Representing secondary fan electrical power;
determining the efficiency eta of the secondary air blower system according to the regulation mode of the secondary air blower 2 ；
Definition of the effective Power P of the Secondary air blower e2 ＝Q 20 ×p 20 ÷3.6×105×K p2 Wherein Q is 20 Represents the total output air quantity of the secondary air machine, p 20 Represents the lift, K of the secondary air blower p2 Representing the compressibility correction coefficient of the secondary air blower;
according to the outlet wind pressure p of the secondary air blower 2 Determining the lift p of the secondary air blower 20 ；
Calculating to obtain the total output air quantity of the secondary air machine
Calculating to obtain the air leakage quantity Q of the secondary air direction flue gas bin △2 ＝Q 20 -Q 2 +Q △1 ；
Calculating to obtain the air leakage rate delta of the air preheater 2 ＝Q △2 ÷Q 0 。
Further, the secondary air fan system efficiency eta is determined according to the adjustment mode of the secondary air fan 2 Comprising:
judging whether the secondary air blower is frequency conversion regulation or movable blade and static blade regulation;
if the secondary air blower is frequency conversion regulation, obtaining the efficiency eta of the secondary air blower system according to the product of the motor efficiency, the transmission efficiency and the fan efficiency of the secondary air blower 2 ；
If the secondary fan is regulated by a movable blade and static blade, acquiring a functional relation between fan efficiency of the secondary fan and wind pressure of a fan outlet, and obtaining the system efficiency eta of the secondary fan according to the product of motor efficiency, transmission efficiency and fan efficiency of the secondary fan 2 。
Further, the motor efficiency is the ratio of the power of the output shaft of the motor to the power of the electric power, and the transmission efficiency is the ratio of the power of the input shaft of the fan to the power of the output shaft of the motor; the fan efficiency is the ratio of the fan effective power to the fan input shaft power.
In a second aspect, the present invention provides an air preheater air leakage monitoring apparatus comprising:
data input unit for acquiring primary air quantity Q 1 Secondary air quantity Q 2 Smoke quantity Q 0 Air pressure p at outlet of primary fan 1 Outlet wind pressure p of secondary fan 2 Primary fan electric power P 1 And secondary air motor power P 2 ；
A data calculation unit for calculating the primary air quantity Q 1 Smoke quantity Q 0 Air pressure p at outlet of primary fan 1 And primary fan electric power P 1 Calculating to obtain the air leakage quantity Q of the primary air direction secondary air bin △1 And the primary air leakage rate delta 1 According to the secondary air quantity Q 2 Smoke quantity Q 0 Outlet wind pressure p of secondary fan 2 Electric power P of secondary air machine 2 And the air leakage quantity Q of the primary air direction secondary air bin △1 Calculating to obtain the air leakage quantity Q of the secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 ；
The data output unit outputs the air leakage quantity Q of the primary air direction secondary air bin △1 Primary air leakage rate delta 1 Leakage air quantity Q of secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 ；
The data remote transmission module is used for enabling the primary air direction secondary air bin to leak air quantity Q △1 Primary air leakage rate delta 1 Leakage air quantity Q of secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 And sending the cloud platform to the Internet of things cloud platform.
Further, the air preheater air leakage monitoring device further comprises a DCS system for receiving the air leakage quantity Q of the primary air direction secondary air bin △1 Primary air leakage rate delta 1 Leakage air quantity Q of secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 。
The working principle and the beneficial effects of the invention are as follows:
in the technical scheme of implementing the invention, the primary air quantity Q measured in real time through the existing measuring point 1 Secondary air quantity Q 2 Smoke quantity Q 0 Air pressure p at outlet of primary fan 1 Secondary processWind pressure p at outlet of fan 2 Primary fan electric power P 1 And secondary air motor power P 2 Directly calculating to obtain the air leakage quantity Q of the primary air direction secondary air bin △1 Primary air leakage rate delta 1 Leakage air quantity Q of secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 And the cloud platform of the Internet of things uploads the measured data to monitor the state of the air preheater of the power plant in real time, so that operators and technicians can monitor and analyze the state of the air preheater timely and accurately, and overhaul is arranged according to the state.
Drawings
The present disclosure will become more readily understood with reference to the accompanying drawings. As will be readily appreciated by those skilled in the art: the drawings are for illustrative purposes only and are not intended to limit the scope of the present invention. Moreover, like numerals in the figures are used to designate like parts, wherein:
FIG. 1 is a flow chart of main steps of a method for monitoring air leakage of a hollow pre-heater according to the present invention;
FIG. 2 is a schematic diagram of the distribution of measuring points in the method for monitoring the air leakage of the hollow pre-heater according to the invention;
fig. 3 is a schematic block diagram of a hollow pre-heater air leakage monitoring apparatus according to the present invention.
Detailed Description
Some embodiments of the invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
Example 1
The embodiment provides an air leakage monitoring method of an air preheater, which directly measures and obtains primary air quantity Q by utilizing a primary air quantity measuring point, a secondary air measuring point and an air quantity measuring point which are installed on site after the air preheater 1 Secondary air quantity Q 2 Smoke quantity Q 0 Air pressure p at outlet of primary fan 1 Outlet wind pressure p of secondary fan 2 Primary fan electric power P 1 And secondary air motor power P 2 Calculating the air leakage quantity of the primary air direction secondary air binQ △1 And secondary air direction flue gas bin air leakage quantity Q △2 Thereby calculating the primary air leakage rate delta 1 Air leakage rate delta of air preheater 2 And the data is sent to the cloud platform of the Internet of things, so that an online air preheater air leakage monitoring function is realized.
FIG. 1 is a flow chart of main steps of a method for monitoring air leakage of a hollow pre-heater according to the present invention. As shown in fig. 1, the air leakage monitoring method of the air preheater in embodiment 1 of the present invention mainly includes the following steps S1 to S4.
Step S1: acquiring primary air quantity Q 1 Secondary air quantity Q 2 Smoke quantity Q 0 Air pressure p at outlet of primary fan 1 Outlet wind pressure p of secondary fan 2 Primary fan electric power P 1 And secondary air motor power P 2 。
FIG. 2 is a schematic diagram of the distribution of measuring points in the method for monitoring the air leakage of the hollow pre-heater according to the invention. As shown in fig. 2, embodiment 1 of the present invention is described using a quarter-bin air preheater, and is applicable to other air preheaters. The primary air quantity is detected at the outlet of the primary air duct air preheater, the secondary air quantity is detected at the outlet of the secondary air duct air preheater, and the smoke quantity is detected at the outlet of the chimney. The wind pressure measuring points of the primary air blower outlet and the secondary air blower outlet are both arranged at the air blower outlet. And the electric power measuring points of the primary fan and the secondary fan are electric energy meter data. However, the present solution is not limited to specific measuring point positions and measuring modes. The scheme is applicable to the condition that the wind pressure measuring point is at the outlet of the fan after the wind quantity measuring point is at the air preheater.
Wherein the primary air quantity Q 1 Secondary air quantity Q 2 Smoke quantity Q 0 Air pressure p at outlet of primary fan 1 Outlet wind pressure p of secondary fan 2 Primary fan electric power P 1 And secondary air motor power P 2 The existing measuring points of the boiler are fully utilized, the periodic detection and verification along with other measuring points of the boiler are realized, independent maintenance is not needed, and the precision can be ensured. After data are measured by the existing measuring point sensor or the additional sensor, the data are transmitted to the data input unit by the DCS system.
Step S2: according to the primary air quantity Q 1 Flue gasQuantity Q 0 Air pressure p at outlet of primary fan 1 And primary fan electric power P 1 Calculating to obtain the air leakage quantity Q of the primary air direction secondary air bin △1 And the primary air leakage rate delta 1 According to the secondary air quantity Q 2 Smoke quantity Q 0 Outlet wind pressure p of secondary fan 2 Electric power P of secondary air machine 2 And the air leakage quantity Q of the primary air direction secondary air bin △1 Calculating to obtain the air leakage quantity Q of the secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 ；
Step S3: outputting the air leakage quantity Q of the primary air direction secondary air bin △1 Primary air leakage rate delta 1 Leakage air quantity Q of secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 ；
Further, the specific calculation process in step S3 includes:
for a fan, the ratio of the power of an output shaft of the motor to the power of the fan is motor efficiency, and the ratio of the power of an input shaft of the fan to the power of the output shaft of the motor is transmission efficiency; the ratio of the fan effective power to the fan input shaft power is the fan efficiency. The output shaft power of the motor and the input shaft power of the fan cannot be directly measured on site. Thus, in the present embodiment, the fan system efficiency, i.e., the product of motor efficiency, transmission efficiency, fan efficiency, is directly used to obtainWherein P is e Represents the fan effective power, and P represents the fan electric power.
Because the transmission efficiency of the field device is greater than 99% and the motor efficiency is greater than 95%, in the embodiment, the default transmission efficiency and the motor efficiency are fixed values and are not changed along with the load change, and the transmission efficiency and the motor efficiency can be directly obtained in the initial stage. For fan efficiency, for systems employing variable frequency adjustment, the fan efficiency may be considered to also not vary with changes in fan load. For fan efficiency adjusted by adopting movable blades or static blades, the fan efficiency under different loads can be determined according to fan characteristic curves (or measured by field tests) provided by manufacturers by the fan outlet wind pressure. In summary, for a specific fan, a table of fan outlet wind pressure and fan efficiency can be established according to the above scheme, and the fan efficiency is directly determined by the fan outlet wind pressure, so as to calculate the fan system efficiency η. For example, when a stator blade is adopted to adjust the wind pressure of an outlet of a fan to 10Kpa, the efficiency of the fan is 87 percent, and when the wind pressure of the outlet is 5Kpa, the efficiency of the fan is changed to 56 percent
Step S31: for the primary air fan, the system efficiency of the primary air fan is obtained through the logic
Wherein P is e1 ＝Q 10 ×p 10 ÷3.6×105×K p1 (2)；P e1 Representing the effective power of the primary air fan; p (P) 1 Representing the electric power of the primary fan; q (Q) 1 Representing the primary air quantity; p is p 10 Representing the lift of the primary fan; q (Q) 10 Indicating the total output air quantity of the primary air blower.
Because the blower lift is the difference between the blower inlet and outlet wind pressures, and both are under the condition of gauge pressure, the blower inlet pressure is 0 in the simplified calculation in the embodiment, so the blower outlet wind pressure is equal to the blower lift value, and the measured primary blower outlet wind pressure p can be directly used 1 Obtain the lift p of the primary fan 10 。
Further, a primary air fan compressibility correction coefficient is calculated:
where k represents the gas index, k=1.4 for air; p is p tF1 Representing the total pressure of the primary fan, namely the difference between the total pressure on the outlet section of the fan and the total pressure on the inlet section, and the outlet pressure of the primary fan in the embodiment; ρ represents the air density; p represents the absolute pressure at the inlet of the fan, i.e. the atmospherePressure.
The total output air quantity of the primary air blower can be obtained by the above formula (1) -formula (3)
Air leakage quantity of primary air direction secondary air bin in air preheater
Step S32: for the secondary air blower, the system efficiency of the secondary air blower is obtained through the logic
Wherein P is e2 ＝Q 20 ×p 20 ÷3.6×105×K p2 (5)；P e2 Representing the effective power of the secondary air blower; p (P) 2 Representing secondary fan electrical power; q (Q) 2 Representing the secondary air quantity; p is p 20 Representing the lift of the secondary air blower; q (Q) 20 Indicating the total output air quantity of the secondary air blower.
Because the blower lift is the difference between the blower inlet and outlet wind pressures, and both are under the condition of gauge pressure, the blower inlet pressure is 0 in the simplified calculation in the embodiment, so the blower outlet wind pressure is equal to the blower lift value, and the measured secondary blower outlet wind pressure p can be directly used 2 Obtaining the lift p of the secondary air blower 20 。
Further, a secondary air compressor compressibility correction coefficient is calculated:
where k represents the gas index, k=1.4 for air; p is p tF2 Representing the total pressure of the secondary fan, namely the difference between the total pressure on the outlet section of the fan and the total pressure on the inlet section, and the outlet pressure of the secondary fan in the embodiment; ρ represents the air density; p represents the absolute pressure at the inlet of the fan, i.e. the atmospheric pressure.
The total output air volume of the secondary air fan can be obtained by the above formula (3) -formula (6)
Air leakage rate of secondary air direction flue gas bin in air preheater
Step S33: calculating to obtain the primary air leakage rate delta 1 ＝Q △1 ÷Q 0 。
Step S34: calculating to obtain the secondary air leakage rate delta 2 ＝Q △2 ÷Q 0 The method comprises the steps of carrying out a first treatment on the surface of the Wherein the secondary air leakage rate is the air leakage rate of the air preheater.
Step S4: the air leakage quantity Q of the primary air direction secondary air bin △1 Primary air leakage rate delta 1 Leakage air quantity Q of secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 And sending the cloud platform to the Internet of things cloud platform.
Further, the method comprises the steps of:
the DCS system receives the air leakage quantity Q of the primary air direction secondary air bin △1 Primary air leakage rate delta 1 Leakage air quantity Q of secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 。
In this embodiment, the DCS system is configured to input data and obtain a calculation result, so as to facilitate monitoring and analysis by an operator.
Based on the steps S1-S4, the primary air quantity Q can be measured in real time through the existing measuring points 1 Secondary air quantity Q 2 Smoke quantity Q 0 Air pressure p at outlet of primary fan 1 Outlet wind pressure p of secondary fan 2 Primary fan electric power P 1 And secondary air motor power P 2 Directly calculating to obtain the air leakage quantity Q of the primary air direction secondary air bin △1 Primary air leakage rate delta 1 Leakage air quantity Q of secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 And the cloud platform of the Internet of things uploads the measured data to monitor the state of the air preheater of the power plant in real time, so that operators and technicians can monitor and analyze the state of the air preheater timely and accurately, and overhaul is arranged according to the state.
It should be noted that, although the foregoing embodiments describe the steps in a specific order, it will be understood by those skilled in the art that, in order to achieve the effects of the present invention, the steps are not necessarily performed in such an order, and may be performed simultaneously (in parallel) or in other orders, and these variations are within the scope of the present invention.
Example 2
The invention provides air leakage monitoring equipment of an air preheater, and fig. 3 is a schematic block diagram of the air leakage monitoring equipment of the air preheater according to the invention. As shown in fig. 3, the air preheater air leakage monitoring apparatus in embodiment 2 of the present invention includes:
data input unit for acquiring primary air quantity Q 1 Secondary air quantity Q 2 Smoke quantity Q 0 Air pressure p at outlet of primary fan 1 Outlet wind pressure p of secondary fan 2 Primary fan electric power P 1 And secondary air motor power P 2 ；
A data calculation unit for calculating the primary air quantity Q 1 Smoke quantity Q 0 Air pressure p at outlet of primary fan 1 And primary fan electric power P 1 Calculating to obtain the air leakage quantity Q of the primary air direction secondary air bin △1 And the primary air leakage rate delta 1 According to the secondary air quantity Q 2 Flue gasQuantity Q 0 Outlet wind pressure p of secondary fan 2 Electric power P of secondary air machine 2 And the air leakage quantity Q of the primary air direction secondary air bin △1 Calculating to obtain the air leakage quantity Q of the secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 ；
The data output unit outputs the air leakage quantity Q of the primary air direction secondary air bin △1 Primary air leakage rate delta 1 Leakage air quantity Q of secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 ；
The data remote transmission module is used for enabling the primary air direction secondary air bin to leak air quantity Q △1 Primary air leakage rate delta 1 Leakage air quantity Q of secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 Sending the cloud platform to an Internet of things cloud platform;
DCS system for receiving the air leakage quantity Q of the primary air direction secondary air bin △1 Primary air leakage rate delta 1 Leakage air quantity Q of secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 。
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will fall within the scope of the present invention.
Claims (9)
1. The air leakage monitoring method of the air preheater is characterized by comprising the following steps of:
acquiring primary air quantity Q 1 Secondary air quantity Q 2 Smoke quantity Q 0 Air pressure p at outlet of primary fan 1 Outlet wind pressure p of secondary fan 2 Primary fan electric power P 1 And secondary air motor power P 2 ；
According to the primary air quantity Q 1 Smoke quantity Q 0 Air pressure p at outlet of primary fan 1 And once at a timeFan electric power P 1 Calculating to obtain the air leakage quantity Q of the primary air direction secondary air bin △1 And the primary air leakage rate delta 1 According to the secondary air quantity Q 2 Smoke quantity Q 0 Outlet wind pressure p of secondary fan 2 Electric power P of secondary air machine 2 And the air leakage quantity Q of the primary air direction secondary air bin △1 Calculating to obtain the air leakage quantity Q of the secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 ；
Outputting the air leakage quantity Q of the primary air direction secondary air bin △1 Primary air leakage rate delta 1 Leakage air quantity Q of secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 ；
The air leakage quantity Q of the primary air direction secondary air bin △1 Primary air leakage rate delta 1 Leakage air quantity Q of secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 And sending the cloud platform to the Internet of things cloud platform.
2. The air preheater air leakage monitoring method of claim 1, further comprising the steps of:
the DCS system receives the air leakage quantity Q of the primary air direction secondary air bin △1 Primary air leakage rate delta 1 Leakage air quantity Q of secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 。
3. The air leakage monitoring method of the air preheater according to claim 1, wherein the primary air quantity Q is as follows 1 Smoke quantity Q 0 Air pressure p at outlet of primary fan 1 And primary fan electric power P 1 Calculating to obtain the air leakage quantity Q of the primary air direction secondary air bin △1 And the primary air leakage rate delta 1 Comprising:
according to the outlet wind pressure p of the primary fan 1 Calculating to obtain a primary fan compressibility correction coefficient K p1 ；
Definition of Primary air System efficiency η 1 Is the product of the motor efficiency, the transmission efficiency and the fan efficiency of the primary fan, namelyWherein P is e1 Represents the effective power of the primary fan, P 1 Representing the electric power of the primary fan;
determining the efficiency eta of the primary air fan system according to the regulation mode of the primary air fan 1 ；
Definition of Primary air Fan effective Power P e1 ＝Q 10 ×p 10 ÷3.6×105×K p1 Wherein Q is 10 Represents the total output air quantity of the primary fan, p 10 Represents the lift, K of the primary fan p1 Representing the compressibility correction coefficient of the primary air fan;
according to the outlet wind pressure p of the primary fan 1 Determining the lift p of the primary fan 10 ；
Calculating to obtain the total output air quantity of the primary fan
Calculating to obtain the air leakage quantity Q of the primary air direction secondary air bin △1 ＝Q 10 -Q 1 ；
Calculating to obtain the primary air leakage rate delta 1 ＝Q △1 ÷Q 0 。
4. The air preheater air leakage monitoring method according to claim 3, wherein the primary air fan system efficiency η is determined according to the adjustment mode of the primary air fan 1 Comprising:
judging whether the primary fan is subjected to variable frequency adjustment or movable blade and static blade adjustment;
if the primary air blower is frequency conversion regulation, obtaining the primary air blower system efficiency eta according to the product of the motor efficiency, the transmission efficiency and the fan efficiency of the primary air blower 1 ；
If the primary fan is regulated by a movable blade stationary blade, acquiring a functional relation between the fan efficiency of the primary fan and the wind pressure of a fan outlet, and obtaining the system efficiency eta of the primary fan according to the product of the motor efficiency, the transmission efficiency and the fan efficiency of the primary fan 1 。
5. A method for monitoring air leakage of an air preheater according to claim 3, wherein said secondary air quantity Q 2 Smoke quantity Q 0 Outlet wind pressure p of secondary fan 2 Electric power P of secondary air machine 2 And the air leakage quantity Q of the primary air direction secondary air bin △1 Calculating to obtain the air leakage quantity Q of the secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 Comprising:
according to the outlet wind pressure p of the secondary air blower 2 Calculating to obtain a compressibility correction coefficient K of the secondary air machine p2 ；
Definition of Secondary air blower System efficiency η 2 Is the product of the motor efficiency, the transmission efficiency and the fan efficiency of the secondary fan, namelyWherein P is e2 Representing the effective power of the secondary air blower, P 2 Representing secondary fan electrical power;
determining the efficiency eta of the secondary air blower system according to the regulation mode of the secondary air blower 2 ；
Definition of the effective Power P of the Secondary air blower e2 ＝Q 20 ×p 20 ÷3.6×105×K p2 Wherein Q is 20 Represents the total output air quantity of the secondary air machine, p 20 Represents the lift, K of the secondary air blower p2 Representing the compressibility correction coefficient of the secondary air blower;
according to the outlet wind pressure p of the secondary air blower 2 Determining the lift p of the secondary air blower 20 ；
Calculating to obtain the total output air quantity of the secondary air machine
Calculating to obtain the air leakage quantity Q of the secondary air direction flue gas bin △2 ＝Q 20 -Q 2 +Q △1 ；
Calculating to obtain the air leakage rate delta of the air preheater 2 ＝Q △2 ÷Q 0 。
6. The method for monitoring air leakage of air preheater according to claim 5, wherein the secondary air blower system efficiency η is determined according to the adjustment mode of the secondary air blower 2 Comprising:
judging whether the secondary air blower is frequency conversion regulation or movable blade and static blade regulation;
if the secondary air blower is frequency conversion regulation, obtaining the efficiency eta of the secondary air blower system according to the product of the motor efficiency, the transmission efficiency and the fan efficiency of the secondary air blower 2 ；
If the secondary fan is regulated by a movable blade and static blade, acquiring a functional relation between fan efficiency of the secondary fan and wind pressure of a fan outlet, and obtaining the system efficiency eta of the secondary fan according to the product of motor efficiency, transmission efficiency and fan efficiency of the secondary fan 2 。
7. The air preheater air leakage monitoring method according to any one of claims 3 or 5, wherein the motor efficiency is a ratio of motor output shaft power to electric power, and the transmission efficiency is a ratio of fan input shaft power to motor output shaft power; the fan efficiency is the ratio of the fan effective power to the fan input shaft power.
8. An air preheater air leakage monitoring device, comprising:
data input unit for acquiring primary air quantity Q 1 Secondary air quantity Q 2 Smoke quantity Q 0 Air pressure p at outlet of primary fan 1 Outlet wind pressure p of secondary fan 2 Primary fan electric power P 1 And secondary air motor power P 2 ；
A data calculation unit for calculating the primary air quantity Q 1 Smoke quantity Q 0 Air pressure p at outlet of primary fan 1 And primary fan electric power P 1 Calculating to obtain the air leakage quantity Q of the primary air direction secondary air bin △1 And the primary air leakage rate delta 1 According to the secondary air quantity Q 2 Smoke quantity Q 0 Outlet wind pressure p of secondary fan 2 Electric power P of secondary air machine 2 And the air leakage quantity Q of the primary air direction secondary air bin △1 Calculating to obtain the air leakage quantity Q of the secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 ；
The data output unit outputs the air leakage quantity Q of the primary air direction secondary air bin △1 Primary air leakage rate delta 1 Leakage air quantity Q of secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 ；
The data remote transmission module is used for enabling the primary air direction secondary air bin to leak air quantity Q △1 Primary air leakage rate delta 1 Leakage air quantity Q of secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 And sending the cloud platform to the Internet of things cloud platform.
9. The air preheater air leakage monitoring apparatus as set forth in claim 8, further comprising a DCS system for receiving the primary air direction secondary air chamber air leakage Q △1 Primary air leakage rate delta 1 Leakage air quantity Q of secondary air direction flue gas bin △2 Air leakage rate delta of air preheater 2 。
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| CN202311152394.8A CN117054014A (en) | 2023-09-07 | 2023-09-07 | Air leakage monitoring method and equipment for air preheater |
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