CN110864316A - Boiler furnace optimizes soot blowing system based on infrared temperature measurement and numerical calculation - Google Patents
Boiler furnace optimizes soot blowing system based on infrared temperature measurement and numerical calculation Download PDFInfo
- Publication number
- CN110864316A CN110864316A CN201910974348.3A CN201910974348A CN110864316A CN 110864316 A CN110864316 A CN 110864316A CN 201910974348 A CN201910974348 A CN 201910974348A CN 110864316 A CN110864316 A CN 110864316A
- Authority
- CN
- China
- Prior art keywords
- temperature
- soot
- hearth
- furnace
- flue gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000004071 soot Substances 0.000 title claims abstract description 98
- 238000007664 blowing Methods 0.000 title claims abstract description 94
- 238000009529 body temperature measurement Methods 0.000 title claims abstract description 21
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000003546 flue gas Substances 0.000 claims abstract description 49
- 238000012545 processing Methods 0.000 claims abstract description 25
- 238000005457 optimization Methods 0.000 claims abstract description 10
- 238000009826 distribution Methods 0.000 claims abstract description 8
- 230000009471 action Effects 0.000 claims abstract description 4
- 239000000523 sample Substances 0.000 claims description 25
- 239000000779 smoke Substances 0.000 claims description 23
- 230000005855 radiation Effects 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 11
- 238000012546 transfer Methods 0.000 claims description 10
- 239000002893 slag Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000004134 energy conservation Methods 0.000 claims description 5
- 239000003245 coal Substances 0.000 description 17
- 238000002485 combustion reaction Methods 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 230000005457 Black-body radiation Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000000921 elemental analysis Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0014—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiation from gases, flames
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/48—Thermography; Techniques using wholly visual means
- G01J5/485—Temperature profile
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2700/00—Ash removal, handling and treatment means; Ash and slag handling in pulverulent fuel furnaces; Ash removal means for incinerators
- F23J2700/001—Ash removal, handling and treatment means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Incineration Of Waste (AREA)
Abstract
The invention relates to a boiler furnace optimization soot blowing system based on infrared temperature measurement and numerical calculation, which comprises: the hearth flue gas temperature acquisition system is used for acquiring flue gas temperature data in the hearth under different ash dirt slagging states in real time; the central processing system is used for inputting the temperature data into a pre-established furnace temperature field reconstruction model to obtain a real-time three-dimensional temperature distribution field in the furnace; according to the obtained three-dimensional temperature field in the hearth, calculating to obtain real-time thermal effective coefficients of all sections in the hearth through a hearth subsection thermodynamic calculation model; outputting soot blowing signals of each section based on a maximum profit principle; and the soot blower is used for receiving the soot blowing signal output by the central processing system and executing a corresponding soot blowing action. The invention helps field operators to judge the soot blowing time of different areas of the hearth.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, and particularly relates to an optimized soot blowing system of a boiler furnace based on infrared temperature measurement and numerical calculation.
Background
The large coal-fired power plant boiler furnace is used as the main combustion space of fuel coal, the temperature of the central area can reach 1500-1800 ℃, because all components of ash in the coal are basically in a molten state at the temperature, under the condition of poor combustion organization in the furnace, ash particles in the molten state which are not fully cooled are easy to adhere to the furnace water-cooled wall with lower temperature, the slag-bonding phenomenon of the furnace water-cooled wall is caused, and a thicker slag layer can be formed along with the increase of the operation time. Untimely clearance will lead to boiler furnace water-cooling wall heat transfer performance to descend the heat absorption and reduce, and furnace exit flue gas temperature risees, and boiler efficiency reduces, and the emergence of the boiler coke-falling phenomenon of putting out a fire probably takes place in the time of seriously to cause boiler incident and cause great economic loss.
At present, the price of domestic coal is high, blending coal is mixed and even poor coal is burnt, which is a main means for improving economic benefit of domestic coal-fired power plants, and thus, the phenomenon of hearth slagging is aggravated. Nowadays, large coal-fired power plant boilers generally adopt a mode of performing steam purging on a furnace water-cooled wall to avoid serious slag bonding. Because the slagging condition can not be directly monitored due to the high temperature of the flue gas in the hearth, the slagging condition of the hearth can be judged only by the experience of operators, a timed soot blowing operation mode is usually adopted, which can possibly cause the increase of the flue gas temperature when the slagging and soot blowing of the hearth are untimely, the efficiency of the boiler is reduced by about 0.5-0.7% when the flue gas temperature is increased by 10 ℃, or the frequent soot blowing steam quantity is increased, for example, the soot blowing steam accounts for about 1% of the total steam quantity, and meanwhile, the heat loss and the throttling loss of the steam are considered, the operation of a soot blower can reduce the efficiency of the boiler by about 0.7%, and the improper frequent soot blowing can damage the heating surface, thereby shortening the service life of the.
Therefore, in the running process of the boiler, how to make an optimized soot blowing strategy according to the slagging condition in the hearth can not only keep the water-cooled wall of the hearth to have better cleanliness and reduce the temperature of the exhaust smoke, but also reduce the frequency of soot blowing and save the amount of soot blowing steam, and is a problem that the soot blowing of the hearth is urgently needed to be solved.
Disclosure of Invention
The invention aims to provide an optimized soot blowing system of a boiler furnace based on infrared temperature measurement and numerical calculation, wherein infrared smoke temperature measuring probes are arranged at different areas of the furnace, a radiation transfer equation and an energy conservation equation are solved to reconstruct a temperature field in the furnace by taking the measuring result of the infrared smoke temperature measuring probes as a boundary condition, and the effective coefficients of the heat of water walls of different sections of the furnace are obtained on the basis of a furnace partition section thermodynamic calculation model established according to the temperature field result and are used as monitoring indexes of the different sections of the furnace, so that field operators are helped to judge the opportunity soot blowing at the different areas of the furnace.
The invention provides an optimized soot blowing system of a boiler furnace based on infrared temperature measurement and numerical calculation, which comprises:
the hearth flue gas temperature acquisition system is used for acquiring flue gas temperature data in the hearth under different ash dirt slagging states in real time;
the central processing system is used for inputting the temperature data into a pre-established furnace temperature field reconstruction model to obtain a real-time three-dimensional temperature distribution field in the furnace; according to the obtained three-dimensional temperature field in the hearth, calculating to obtain real-time thermal effective coefficients of all sections in the hearth through a hearth subsection thermodynamic calculation model; outputting soot blowing signals of each section based on a maximum profit principle;
and the soot blower is used for receiving the soot blowing signal output by the central processing system and executing a corresponding soot blowing action.
Further, furnace flue gas temperature collection system includes:
the infrared smoke temperature measuring probe is used for measuring smoke temperature signals in the hearth in real time under different ash, dirt and slag bonding states;
the information manager is used for receiving a temperature signal of the infrared smoke temperature measuring probe and sending the temperature signal to the distributed controller connected with the information manager for information sharing;
and the distributed controller is used for receiving the temperature signal shared by the information manager, correspondingly processing the temperature signal and storing the processed temperature signal into an SQL database connected with the distributed controller so as to be matched with the subsystem for use.
Further, the information manager includes:
the temperature transmitter is used for converting the potential measured by the infrared flue gas temperature measuring probe into a current signal of 4-20 mA;
the current-voltage converter is used for converting a 4-20mA current signal output by the temperature transmitter into a 0-5V voltage signal;
and the analog-to-digital converter is used for performing analog-to-digital conversion on the voltage signal of 0-5V output by the current-to-voltage converter so as to convert the voltage signal into a readable information manager value signal.
Furthermore, the infrared smoke temperature measuring probe is installed on a water wall fin and cooled by compressed air.
Furthermore, two layers of the infrared smoke temperature measuring probes are arranged in the height direction of the hearth, one layer is arranged in a screen bottom area, the other layer is arranged in an uppermost over-fire air area, and a plurality of the infrared smoke temperature measuring probes are arranged on each layer in a crossed mode.
Further, the central processing system takes the measured discrete flue gas temperature at the periphery of the hearth as a boundary condition, and solves a radiation transfer equation and an energy conservation equation by adopting a discrete coordinate method to obtain a three-dimensional temperature distribution field in the hearth.
Further, the central processing system compares the real-time thermal effective coefficient of each section in the hearth of each section obtained by calculation with the optimal soot blowing thermal effective coefficient calculated based on the maximum gain principle, and outputs a soot blowing signal if the real-time thermal effective coefficient of each section in the hearth is greater than the optimal soot blowing thermal effective coefficient, otherwise, does not output the soot blowing signal.
Borrow by above-mentioned scheme, optimize the soot blowing system through boiler furnace based on infrared temperature measurement and numerical calculation, have following technological effect:
1) and calculating to obtain the optimal soot blowing heat effective coefficient according to the maximum gain principle, and performing soot blowing instead of timing soot blowing only when the deposited soot and slag reach the optimal soot blowing heat effective coefficient.
2) And only performing soot blowing on the region reaching the optimal soot blowing thermal effective coefficient according to the monitoring result, and avoiding starting all soot blowers during soot blowing.
3) And determining the blowing time according to the real-time thermal effective coefficient value, and avoiding blowing soot according to the set time.
4) The pipe wall thinning and the steam loss caused by unreasonable soot blowing can be reduced, considerable economic benefits can be brought, and the safe operation of the boiler can be ensured.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic diagram of the measuring point position of the infrared flue gas temperature measuring probe in one embodiment of the present invention;
FIG. 3 is a schematic view of furnace section division according to an embodiment of the present invention;
fig. 4 is a schematic diagram of the thermal effective coefficients calculated by the furnace segmental thermodynamic calculation model in an embodiment of the invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
This embodiment provides a boiler furnace optimizes soot blowing system based on infrared temperature measurement and numerical calculation, includes:
the hearth flue gas temperature acquisition system is used for acquiring flue gas temperature data in the hearth under different ash dirt slagging states in real time;
the central processing system is used for inputting the temperature data into a pre-established furnace temperature field reconstruction model to obtain a real-time three-dimensional temperature distribution field in the furnace; according to the obtained three-dimensional temperature field in the hearth, calculating to obtain real-time thermal effective coefficients of all sections in the hearth through a hearth subsection thermodynamic calculation model; outputting soot blowing signals of each section based on a maximum profit principle;
and the soot blower is used for receiving the soot blowing signal output by the central processing system and executing a corresponding soot blowing action.
A furnace temperature field reconstruction model:
and solving a radiation transfer equation and an energy conservation equation by using the measured discrete flue gas temperature at the periphery of the hearth as a boundary condition and adopting a discrete coordinate method to obtain a three-dimensional temperature distribution field in the hearth.
For radiative heat exchange involving absorbing, emitting and scattering media, the radiative transfer equation can be expressed as:
wherein, IηIs the intensity of the radiation, s is the wavelength, kη(η, phi) emissivity, Ibη(T) Black body radiation coefficient, σ, at the same wavelengthη(η, phi) the scattering coefficient,
is a radiation source item.
Energy conservation equation:
where λ is the effective thermal conductivity, cpTS is the energy source per unit volume of the fluid phase and the particle phase due to the varying mass, qrFor radiating heat to the fluid, wsIs the rate of reaction of the s component in the fluid phase, wsQsExothermic for the reaction per unit volume of fluid phase.
The basic idea of the discrete coordinate method is to discretize the radiation transfer equation in a finite number of coordinate directions within a solid angle of 4 pi to form a finite difference equation set in each direction, and after solving the numerical solution, the total radiation intensity can be approximated by the sum of the radiation intensities in each direction. Specific discrete processes of a radiation transfer equation are given for the problem of two-dimensional radiation heat exchange, and a one-dimensional form can be obtained by simplifying two dimensions.
The discrete coordinate method is that the area to be measured is divided into a series of grids, the average temperature of each grid is obtained through solving, and then the temperature value of any point in the area to be measured is obtained through an interpolation method, so that the distribution condition of the whole temperature field is obtained.
A furnace chamber subsection thermodynamic calculation model:
dividing the hearth into a main combustion area, a burnout area and a radiation heat exchange area along the height direction according to the combustion property of the boiler hearth, wherein the average temperature of the flue gas in different sections is calculated by the following method:
(1) flue gas temperature of main combustion zone
The zone is the burner layer and the energy balance equation is: section flue gas heat absorption capacity + section water wall heat absorption capacity + heat release to adjacent section is section pulverized coal combustion heat release, and the section outlet flue gas temperature expression:
in the formula βcrThe coal powder burnout rate; qar,netkJ/kg of base low-grade calorific value received by coal; qkkJ/kg of heat of air and recycled flue gas entering the furnace; qwrkJ/kg of heat input from an external heat source; qhzkJ/kg for removing heat of slag; a islThe furnace blackness of the section; t "is the flue gas outlet temperature, k; b isj1Kg/h of the amount of fuel fed into the zone; vC"is specific heat capacity of flue gas, kJ/(kg. DEG C.); psi F is the product of the thermal effective coefficient and the water wall section area: psi F psiPJFPJ+ψC1FC1+ψC2FC2Wherein psiPJ、ψC1And psiC2Respectively the effective coefficient of heat of the water-cooled wall and the effective coefficients of heat of the upper section and the lower section of the section pair; fPJ、FC1And FC2Respectively, the area of the sectional water-cooled wall and the area of the upper and lower cross sections, m2。
(2) Flue gas temperature in burnout zone
The region is a burnout region at the upper part of the combustor layer, and the energy balance equation is as follows: section flue gas heat absorption capacity, section water wall heat absorption capacity and section upward section radiation heat, namely section pulverized coal combustion heat release capacity and burner section radiation heat to the section, and the section outlet flue gas temperature expression is as follows:
in the formula △βcrIs the combustion rate of the pulverized coal in the section; VC 'and VC "temperature theta' and theta" average specific heat capacity of flue gas, kJ/(kg. DEG C); b isj2The amount of fuel fed into zone III is kg/h; t isPJIs the arithmetic mean value of the temperature of the flue gas in the burnout zone, K;
(3) flue gas temperature in radiation heat exchange area
The coal dust in the section is basically burnt out, obvious coal dust combustion heat release is avoided, the flue gas heat release is mainly used for supplying water cooling walls, and the temperature expression of the flue gas at the outlet of the section is as follows:
in the formula: a. thePJIs the average cross-sectional area of the hearth of the section,
the maximum principle is as follows: theoretically, the higher the soot blowing frequency, the cleaner the heating surface, the greater the direct benefit of soot blowing obtained, but the amount of steam consumed by soot blowing also increases. Wherein, a critical soot blowing frequency n exists1The amount of steam consumed at this time offsets the soot blowing benefit. The theoretical optimization target is to be between 0 and n1An optimal soot blowing frequency is searched internally, so that the net gain Q of soot blowing at the momentnetAnd max. However, the actual operation must also consider the abrasion of the soot blowing frequency on the heating surface, and the abrasion of the soot blowing frequency on the heating surface should be QnetMaximum (or near maximum) soot blowing frequency is sought.
Qnet＝Qin-Qout(7)
In the formula, QinImprovement of heat transfer efficiency by soot blowing, coal saving, QoutThe steam amount consumed by soot blowing brings more coal consumption.
If the soot blower does not act in the period of time, the heat exchange amount in the period of time is as follows:
wherein F is the heat transfer area of the heating surface, and Delta T is the logarithmic mean temperature and pressure.
If the soot blowing is carried out for n times, the heat exchange quantity is as follows:
therefore, the soot blowing yield of n soot blowing is:
and the soot blowing expenditure of n times of soot blowing is as follows:
Qout＝n*τ1*m*(Hchou-H0)
thus, there are:
max (Q)net) The optimal frequency of soot blowing of the heating surface can be obtained.
The present invention is described in further detail below.
As shown in fig. 1, a boiler furnace optimization soot-blowing system based on infrared temperature measurement and numerical calculation comprises a furnace flue gas temperature acquisition system 1, a central processing system 2 and a soot blower 3. The furnace flue gas temperature acquisition system 1 is responsible for acquiring flue gas temperature signals at different positions, converting the signals into digital signals and transmitting the digital signals to the central processing system 2. The central processing system 2 is responsible for inputting soot blowing signals to the soot blowers 3 according to the collected flue gas temperatures at different hearth positions through three-dimensional temperature fields in the reconstructed hearth, hearth subsection thermodynamic calculation and maximum gain principle calculation. The soot blower 3 is a final soot blowing executing mechanism, receives soot blowing signals of the central processing system 2 and synchronously operates.
As shown in fig. 2, the furnace flue gas temperature acquisition system includes an infrared flue gas temperature measurement probe 4, an information manager 5, and a distributed controller 6. The infrared smoke temperature measuring probe 4 is arranged on the water-cooled wall fins by punching the water-cooled wall fins, so that the infrared smoke temperature measuring probe 4 can be just opposite to high-temperature smoke in a hearth, and meanwhile, in order to avoid burning out of the infrared smoke temperature measuring probe 4 by the high-temperature smoke, compressed air is adopted to cool the infrared smoke temperature measuring probe 4. The temperature signal collected by the infrared smoke temperature measuring probe 4 is transmitted to the information manager 5 by a lead; the information manager 5 sends the temperature signals collected by the infrared smoke temperature measuring probe 4 to the connected decentralized controller 6 for information sharing; the distributed controller 6 processes the temperature signals collected by the infrared smoke temperature measuring probe 4 and then stores the processed temperature signals into a connected SQL database for the central processing system 2 to read.
The information manager 5 comprises a temperature transmitter, a current-voltage transmitter and an analog-to-digital converter, wherein the temperature transmitter converts the thermal potential into a current signal (4-20mA), the current-voltage converter converts the current signal (4-20mA) output by the temperature transmitter into a voltage signal (0-5V), and the analog-to-digital converter performs A/D conversion and photoelectric isolation on the voltage signal (0-5V) output by the current-voltage converter and converts the voltage signal into a digital signal.
The distributed controller 6 is a distributed control system and can acquire real-time operation parameters of the boiler. The distributed controller 6 shares files with the information manager 5, and stores the processed data into an MIS network background database for other systems to use;
the infrared smoke temperature measuring probe 4 in the furnace smoke temperature acquisition system is generally arranged in two layers along the height direction of the furnace, wherein one layer is arranged in the bottom area of the screen, and the other layer is arranged in the top over-fire air area. 6 infrared flue gas temperature measuring probes 4 are arranged on each layer, and are arranged in a cross mode, so that the temperature levels of the flue gas on the left side and the right side of the hearth in different ash and dirt states can be displayed.
The working process of the boiler furnace optimization soot blowing system based on infrared temperature measurement and numerical calculation comprises the following steps:
And 2, the central processing system 2 takes the furnace flue gas temperature signals acquired in the step 1 as boundary conditions, and constructs temperature fields of different sections of the furnace according to equations (1) and (2).
And 3, calculating by the central processing system 2 according to the temperature fields of the different sections of the hearth calculated in the step 2 and according to equations (4) and (5) to obtain the thermal effective coefficients of the different hearth sections. As shown in fig. 3, 7 is a hearth soot blower; 8 is over-fire air OFA; and 9 is a combustor.
And 3, calculating required related data in step 3, wherein the required related data comprise design parameters and structural parameters of a boiler furnace, common coal quality data and related operation parameters. The design parameters and the structural parameters of the boiler furnace comprise furnace width, depth, different section heights, each layer of combustor and over-fire air elevation and furnace outlet area. Common coal quality data includes industrial and elemental analysis and heating values of coal. The relevant operation parameters comprise coal quantity, the running condition of the burner, the air quantity of primary air, secondary air and over-fire air and the fineness of coal powder.
And 4, comparing the thermal effective coefficient of each section calculated in the step 3 with the optimal soot blowing thermal effective coefficient calculated by the pre-established maximum profit principle by the central processing system 2, and if the thermal effective coefficient calculated in the step 3 is larger than the optimal soot blowing thermal effective coefficient, outputting a soot blowing signal to the soot blower 3 by the central processing system 2, otherwise, not outputting the soot blowing signal.
And 5, receiving the soot blowing signals of the central processing system 2 by the soot blower 3, and synchronously putting the soot blowing signals into operation to realize closed-loop control.
The invention can intuitively display the ash deposition and slag bonding degree of the water cooling wall of each section, has the display characteristic of blowing ash according to requirements, and particularly has the following technical effects:
1) and calculating to obtain the optimal soot blowing heat effective coefficient according to the maximum gain principle, and only when the deposited soot and the slag reach the optimal soot blowing heat effective coefficient, performing soot feeding instead of timed soot blowing.
2) And only performing soot blowing on the region reaching the optimal soot blowing thermal effective coefficient according to the monitoring result, and avoiding starting all soot blowers during soot blowing.
3) Determining the purging time according to the real-time thermal effective coefficient value, and avoiding soot blowing according to the set time;
4) the pipe wall thinning and the steam loss caused by unreasonable soot blowing can be reduced, considerable economic benefits can be brought, and the safe operation of the boiler can be ensured.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. The utility model provides a boiler furnace optimizes soot blowing system based on infrared temperature measurement and numerical calculation which characterized in that includes:
the hearth flue gas temperature acquisition system is used for acquiring flue gas temperature data in the hearth under different ash dirt slagging states in real time;
the central processing system is used for inputting the temperature data into a pre-established furnace temperature field reconstruction model to obtain a real-time three-dimensional temperature distribution field in the furnace; according to the obtained three-dimensional temperature field in the hearth, calculating to obtain real-time thermal effective coefficients of all sections in the hearth through a hearth subsection thermodynamic calculation model; outputting soot blowing signals of each section based on a maximum profit principle;
and the soot blower is used for receiving the soot blowing signal output by the central processing system and executing a corresponding soot blowing action.
2. The boiler furnace optimization soot-blowing system based on infrared temperature measurement and numerical calculation as claimed in claim 1, wherein the furnace flue gas temperature acquisition system comprises:
the infrared smoke temperature measuring probe is used for measuring smoke temperature signals in the hearth in real time under different ash, dirt and slag bonding states;
the information manager is used for receiving a temperature signal of the infrared smoke temperature measuring probe and sending the temperature signal to the distributed controller connected with the information manager for information sharing;
and the distributed controller is used for receiving the temperature signal shared by the information manager, correspondingly processing the temperature signal and storing the processed temperature signal into an SQL database connected with the distributed controller so as to be matched with the subsystem for use.
3. The boiler furnace optimization soot-blowing system based on infrared temperature measurement and numerical calculation as claimed in claim 2, wherein the information manager comprises:
the temperature transmitter is used for converting the potential measured by the infrared flue gas temperature measuring probe into a current signal of 4-20 mA;
the current-voltage converter is used for converting a 4-20mA current signal output by the temperature transmitter into a 0-5V voltage signal;
and the analog-to-digital converter is used for performing analog-to-digital conversion on the voltage signal of 0-5V output by the current-to-voltage converter so as to convert the voltage signal into a readable information manager value signal.
4. The boiler furnace optimization soot-blowing system based on infrared temperature measurement and numerical calculation as claimed in claim 3, wherein the infrared flue gas temperature measurement probe is installed on a water wall fin and is cooled by compressed air.
5. The boiler furnace optimization soot-blowing system based on infrared temperature measurement and numerical calculation as claimed in claim 4, wherein the infrared flue gas temperature measurement probes are arranged in two layers along the height direction of the furnace, one layer is arranged in the bottom screen area, the other layer is arranged in the uppermost over-fire air area, and a plurality of the infrared flue gas temperature measurement probes are arranged in each layer in a crossed manner.
6. The boiler furnace optimization soot-blowing system based on infrared temperature measurement and numerical calculation as claimed in any one of claims 1 to 5, wherein the central processing system uses the measured discrete flue gas temperature at the periphery of the furnace as a boundary condition, and adopts a discrete coordinate method to solve a radiation transfer equation and an energy conservation equation to obtain a three-dimensional temperature distribution field in the furnace.
7. The boiler furnace optimization soot-blowing system based on infrared temperature measurement and numerical calculation as claimed in claim 6, wherein the central processing system compares the calculated real-time thermal effective coefficient of each section in the furnace with the optimum soot-blowing thermal effective coefficient calculated based on the maximum profit principle, and outputs a soot-blowing signal if the real-time thermal effective coefficient of each section in the furnace is greater than the optimum soot-blowing thermal effective coefficient, otherwise does not output the soot-blowing signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910974348.3A CN110864316B (en) | 2019-10-14 | 2019-10-14 | Boiler furnace optimizes soot blowing system based on infrared temperature measurement and numerical calculation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910974348.3A CN110864316B (en) | 2019-10-14 | 2019-10-14 | Boiler furnace optimizes soot blowing system based on infrared temperature measurement and numerical calculation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110864316A true CN110864316A (en) | 2020-03-06 |
| CN110864316B CN110864316B (en) | 2021-10-19 |
Family
ID=69652438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910974348.3A Expired - Fee Related CN110864316B (en) | 2019-10-14 | 2019-10-14 | Boiler furnace optimizes soot blowing system based on infrared temperature measurement and numerical calculation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110864316B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112283731A (en) * | 2020-10-27 | 2021-01-29 | 广东电科院能源技术有限责任公司 | Soot blowing method and system for heating surface of coal-fired power station boiler |
| CN113266814A (en) * | 2021-05-20 | 2021-08-17 | 华能安源发电有限责任公司 | Boiler water wall temperature control method |
| CN113847611A (en) * | 2021-08-18 | 2021-12-28 | 浙江大学 | Power station boiler furnace intelligent soot blowing system and method based on online monitoring of inner wall temperature of furnace |
| CN113864813A (en) * | 2021-08-20 | 2021-12-31 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Control system, method, electronic equipment and storage medium of combustor |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101034009A (en) * | 2007-04-09 | 2007-09-12 | 上海发电设备成套设计研究院 | Online detecting, soot blowing and optimal energy-saving method for large coal-fired boiler |
| CN101598688A (en) * | 2009-06-10 | 2009-12-09 | 东南大学 | Boiler Ash fouling monitoring and soot blowing and optimal method based on the ature of coal on-line measurement |
| CN102102870A (en) * | 2011-01-14 | 2011-06-22 | 华北电力大学 | Furnace chamber ash-dirt subarea on-line monitoring device based on acoustic thermometry |
| CN103759277A (en) * | 2014-01-28 | 2014-04-30 | 烟台龙源电力技术股份有限公司 | Intelligent soot blowing closed-loop control method, device and system for coal-fired power station boiler |
| CN106352320A (en) * | 2016-10-31 | 2017-01-25 | 东南大学 | Sectional real-time soft-measurement method of boiler furnace slagging of power station |
| CN106765031A (en) * | 2017-01-23 | 2017-05-31 | 东南大学 | A kind of furnace of power-plant boilers slagging scorification Multi sectional method of real-time |
| CN107091700A (en) * | 2017-03-14 | 2017-08-25 | 江苏方天电力技术有限公司 | Temperature Distribution flexible measurement method in burner hearth based on burner hearth Multi sectional slagging situation |
| CN108716664A (en) * | 2018-04-28 | 2018-10-30 | 国网山东省电力公司电力科学研究院 | A kind of method and apparatus of on-line measurement burner hearth ash fouling coefficient |
-
2019
- 2019-10-14 CN CN201910974348.3A patent/CN110864316B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101034009A (en) * | 2007-04-09 | 2007-09-12 | 上海发电设备成套设计研究院 | Online detecting, soot blowing and optimal energy-saving method for large coal-fired boiler |
| CN101598688A (en) * | 2009-06-10 | 2009-12-09 | 东南大学 | Boiler Ash fouling monitoring and soot blowing and optimal method based on the ature of coal on-line measurement |
| CN102102870A (en) * | 2011-01-14 | 2011-06-22 | 华北电力大学 | Furnace chamber ash-dirt subarea on-line monitoring device based on acoustic thermometry |
| CN103759277A (en) * | 2014-01-28 | 2014-04-30 | 烟台龙源电力技术股份有限公司 | Intelligent soot blowing closed-loop control method, device and system for coal-fired power station boiler |
| CN106352320A (en) * | 2016-10-31 | 2017-01-25 | 东南大学 | Sectional real-time soft-measurement method of boiler furnace slagging of power station |
| CN106765031A (en) * | 2017-01-23 | 2017-05-31 | 东南大学 | A kind of furnace of power-plant boilers slagging scorification Multi sectional method of real-time |
| CN107091700A (en) * | 2017-03-14 | 2017-08-25 | 江苏方天电力技术有限公司 | Temperature Distribution flexible measurement method in burner hearth based on burner hearth Multi sectional slagging situation |
| CN108716664A (en) * | 2018-04-28 | 2018-10-30 | 国网山东省电力公司电力科学研究院 | A kind of method and apparatus of on-line measurement burner hearth ash fouling coefficient |
Non-Patent Citations (2)
| Title |
|---|
| 还博文: "《锅炉燃烧理论与应用》", 30 September 1999 * |
| 陈晓东: "《大型电站锅炉炉内温度场的数值试验研究》", 《热能动力工程》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112283731A (en) * | 2020-10-27 | 2021-01-29 | 广东电科院能源技术有限责任公司 | Soot blowing method and system for heating surface of coal-fired power station boiler |
| CN113266814A (en) * | 2021-05-20 | 2021-08-17 | 华能安源发电有限责任公司 | Boiler water wall temperature control method |
| CN113847611A (en) * | 2021-08-18 | 2021-12-28 | 浙江大学 | Power station boiler furnace intelligent soot blowing system and method based on online monitoring of inner wall temperature of furnace |
| CN113847611B (en) * | 2021-08-18 | 2022-04-12 | 浙江大学 | Intelligent soot blowing system and method for power station boiler furnace |
| CN113864813A (en) * | 2021-08-20 | 2021-12-31 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Control system, method, electronic equipment and storage medium of combustor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110864316B (en) | 2021-10-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110864316B (en) | Boiler furnace optimizes soot blowing system based on infrared temperature measurement and numerical calculation | |
| Liang et al. | An investigation on the heat transfer behavior and slag deposition of membrane wall in pilot-scale entrained-flow gasifier | |
| CN103277784B (en) | Supercritical coal-fired units pendant superheater tube wall temperature early warning optimal control method | |
| CN102102870A (en) | Furnace chamber ash-dirt subarea on-line monitoring device based on acoustic thermometry | |
| CN102944011B (en) | Control system and control method for material bed of circulating fluidized bed boiler | |
| Yao et al. | Heat transfer analysis of stationary bed materials in a CFB boiler after a sudden power failure | |
| CN213362403U (en) | Coal-fired unit water-cooled wall overtemperature control system based on wall temperature prediction | |
| CN203464262U (en) | Circulating fluidized bed boiler for combusting palm dreg | |
| CN102992335A (en) | Industrial production device and method for producing nanometer SiO2 rice hull ash | |
| CN203613150U (en) | Feed coal front-loading pyrolysis device used for large-scale pulverized coal furnace | |
| CN112097232A (en) | Coal-fired unit water-cooled wall overtemperature control system and method based on wall temperature prediction | |
| CN202066001U (en) | Circulating fluidized bed boiler utilizing three wastes generated during combustion in coal chemical industry | |
| CN111981470A (en) | Opposed-wall/arch combustion boiler combustion system intelligent optimization adjustment system and method | |
| CN205635489U (en) | Pyrolysis oven automatic control system | |
| CN104197365A (en) | Preheating combustion air device for recovering waste heat of high-temperature slag in stepped mode | |
| CN203112518U (en) | Industrial production device for preparing nano-silicon-dioxide rice hull ash | |
| CN110878937A (en) | Steam superheater and use method thereof | |
| CN203517770U (en) | Water-cooled grate biomass boiler | |
| CN112013417B (en) | Combustion optimization adjustment method and system for high-alkali coal boiler | |
| CN203489482U (en) | Heat transfer fluid fluidization-and-suspension coal slime combustion boiler | |
| CN210050992U (en) | Coal-fired boiler type hot-blast stove | |
| CN203148032U (en) | Efficient pulverized-coal-fired molten salt furnace | |
| CN202993182U (en) | CFB (circulating fluid bed)-sarciniform radiation boiler for lightening high-alkalinity coal contamination | |
| CN2718396Y (en) | Atmospheric pulverized coal fluid-bed coal gasification furnace | |
| CN208125287U (en) | A kind of temperature measuring equipment of station boiler outlet flue |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Li Haoyu Inventor after: Xu Xiangchun Inventor after: Zhang Wenjun Inventor after: Wang Ruifeng Inventor after: Hao Baoqian Inventor after: Ren Fuhu Inventor after: Guo Min Inventor after: Guo Qiushi Inventor after: Fan Lijun Inventor after: Wan Peng Inventor before: Zhang Wenjun Inventor before: Li Haoyu Inventor before: Wang Ruifeng Inventor before: Hao Baoqian Inventor before: Ren Fuhu Inventor before: Guo Min Inventor before: Guo Qiushi Inventor before: Fan Lijun Inventor before: Wan Peng Inventor before: Xu Xiangchun |
|
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211019 |