CN113280508B - System and method for determining optimal inlet air temperature of thermal power generating unit with air heater - Google Patents

System and method for determining optimal inlet air temperature of thermal power generating unit with air heater Download PDF

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Publication number
CN113280508B
CN113280508B CN202110694537.2A CN202110694537A CN113280508B CN 113280508 B CN113280508 B CN 113280508B CN 202110694537 A CN202110694537 A CN 202110694537A CN 113280508 B CN113280508 B CN 113280508B
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air temperature
generating unit
power generating
thermal power
optimal
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CN113280508A (en
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马汀山
吕凯
谢天
居文平
王妍
程东涛
杨荣祖
石慧
薛朝囡
邓佳
张建元
许朋江
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Xian Thermal Power Research Institute Co Ltd
Xian Xire Energy Saving Technology Co Ltd
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Xian Thermal Power Research Institute Co Ltd
Xian Xire Energy Saving Technology Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D11/00—Feed-water supply not provided for in other main groups
    • F22D11/02—Arrangements of feed-water pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L15/00—Heating of air supplied for combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Water Supply & Treatment (AREA)
  • Air Supply (AREA)

Abstract

The invention discloses a system and a method for determining the optimal inlet air temperature of a thermal power generating unit with a heater, wherein field operation data is adopted, the highest power supply load of the thermal power generating unit under the conditions of boiler inlet coal quantity and ambient temperature is taken as an optimization objective function, a univariate comparison method is adopted, the inlet air temperature of the thermal power generating unit is adjusted in a mode of hot side steam or hot water flow of the heater, the power supply load of the thermal power generating unit is compared with a reference working condition, and if the power supply load of the thermal power generating unit is smaller than the reference working condition, the original reference working condition is still taken as the reference working condition; if the current temperature is larger than the reference value, the corresponding operation working condition of the furnace inlet air temperature is used as a new reference working condition, the furnace inlet air temperature is adjusted by the unit, and next iteration optimization is carried out. The method takes the maximum power supply load of the thermal power generating unit under the conditions of the coal amount at the boiler inlet and the ambient temperature as an optimization objective function, and obtains the optimal control value of the boiler inlet air temperature of the thermal power generating unit under the boundary conditions of different boiler inlet coal amounts, ambient temperatures and the like on line, thereby achieving the purposes of maximum power supply load and maximum profitability.

Description

System and method for determining optimal inlet air temperature of thermal power generating unit with air heater
Technical Field
The invention belongs to the technical field of energy conservation and consumption reduction, and relates to a system and a method for determining the optimal inlet air temperature of a thermal power generating unit with a heater.
Background
The coal-fired boiler of the power station is generally provided with a fan heater to avoid the damage of low-temperature corrosion on a tail heating surface. The air heater is arranged in an air duct from an outlet of a primary air fan (including a blower) to an inlet of the air preheater. According to the form of a heat source, the air heater can be divided into a steam air heater and a hot water air heater, wherein the steam air heater is in standard configuration for design and construction of a coal-fired power plant, and a steam source is taken from an auxiliary steam header; the hot water air heater is a waste heat utilization form in the energy-saving transformation series of the running machine set, a flue gas-water heat exchanger is arranged in a flue from an outlet of a boiler air preheater to an inlet of a dust remover, an air-water heat exchanger is arranged in an air duct from an outlet of a primary air fan (including a blower) to an inlet of an air preheater, the water is used as a heat carrier, the residual heat of the flue gas at the outlet of an air preheater of the boiler is used for heating cold air entering the boiler, the redundant part enters the inlet of a No. 5 low-pressure heater and is used for exhausting and squeezing the steam of the low-pressure cylinder part of the steam turbine, the system is called as a low-temperature economizer and air heater combined system, the system can effectively utilize waste heat of discharged smoke, partially replaces a steam air heater, reduces coal consumption of unit power generation, improves efficiency of the dust remover, improves inlet air temperature and outlet smoke temperature of the air preheater, greatly relieves ash blockage of the air preheater, and can also reduce power consumption of an induced draft fan and water consumption of a desulfurization system.
In the actual operation of the boiler, the temperature of the exhausted smoke is generally higher than the designed value due to various reasons such as ash accumulation, slag bonding or ash blockage on the heating surface, change of the coal type for combustion (such as increase of moisture and ash content), operation level and the like. Based on the energy cascade utilization principle, the exhaust gas temperature in the boiler is reduced as much as possible, for a unit which cannot reduce the exhaust gas temperature in the boiler, the exhaust gas temperature is generally reduced by adopting a flue gas waste heat recovery technology, a flue gas-water heat exchanger is arranged in a flue from an outlet of an air preheater of the boiler to an inlet of a dust remover, low-temperature condensed water is introduced to absorb the flue gas waste heat at the outlet of the air preheater, and the high-temperature condensed water after heat absorption enters a low-pressure heater to extrude part of a low-pressure cylinder to perform regenerative steam extraction.
In a word, the air heater and the low-temperature economizer are combined to form a waste heat recovery system of the thermal power generating unit.
Referring to fig. 1, fig. 1 is a process schematic of a combined steam heater and low temperature economizer system. Steam at the outlet of a superheater of the boiler 1 enters a high-pressure cylinder 2 to do work, exhaust steam enters a reheater of the boiler 1 to be heated for the second time and then enters an intermediate-pressure cylinder 2 to do work, the exhaust steam is divided into two paths, one path of the exhaust steam enters a low-pressure cylinder 3 to do work, and the exhaust steam enters a condenser 5 to be condensed; the other path enters a steam air heater 13. The high and medium pressure cylinder 2 and the low pressure cylinder 3 are coaxially connected and drive a generator 4 to generate electricity together. Condensed water at the outlet of the condenser 5 sequentially passes through a No. 8 low-pressure heater 6, a No. 7 low-pressure heater 7, a No. 6 low-pressure heater 8, a No. 5 low-pressure heater 9, a water feeding pump 10 and a high-pressure heater group 11, is heated and pressurized, and then enters a boiler to complete thermodynamic cycle.
The hot flue gas at the outlet of the economizer of the boiler 1 enters an air preheater 12 to heat hot air at the outlet of a steam air heater 13, then flows through a low-temperature economizer 14, a dust remover 15, a draught fan 16, a desulfurizing tower 17 and a chimney 18 in sequence, is subjected to desulfurization, denitrification, dedusting and cooling, and then is discharged into the atmospheric environment.
Water is respectively taken from the No. 8 low-pressure heater 6 and the No. 7 low-pressure heater 7, the water is pressurized by the circulating booster pump 19 after being mixed, enters the low-temperature economizer 14 for heat absorption and temperature rise, and then enters the No. 6 low-pressure heater 8 outlet water pipeline.
Referring to fig. 2, fig. 2 is a process diagram of a combined hot water air heater and low temperature economizer system.
The hot flue gas at the outlet of the boiler economizer enters an air preheater 12 to heat hot air at the outlet of a hot water air heater 20, then flows through a low-temperature economizer 14, a dust remover 15, a draught fan 16, a desulfurizing tower 17 and a chimney 18 in sequence, is subjected to desulfurization, denitrification, dedusting and cooling, and then is discharged into the atmospheric environment.
Water is respectively taken from the No. 8 low-pressure heater 6 and the No. 7 low-pressure heater 7, the mixture is pressurized by the circulating booster pump 19 and then enters the low-temperature economizer 14 to absorb heat and raise the temperature, the high-temperature condensed water at the outlet of the low-temperature economizer 14 is divided into two paths, one path of the high-temperature condensed water enters the hot water air heater 20 to heat cold air at the outlet of the fan, and the other path of the high-temperature condensed water enters the water main pipe at the outlet of the No. 6 low-pressure heater 8.
The steam air heater 13 is arranged in an air channel between the outlet of the hot water air heater 20 and the inlet of the air preheater and is used as an emergency backup in case of the fault of the hot water air heater. The heat source of the steam air heater 13 is taken from the exhaust steam of the thermal power generating unit, and drained water is returned to the condenser.
The power station waste heat recovery system composed of the air heater and the low-temperature economizer not only retains the original safety protection function of the air heater (namely, the damage of low-temperature corrosion on the heating surface at the tail part is avoided), but also has the functions of saving energy and improving efficiency.
However, the power station waste heat recovery system composed of the air heater and the low-temperature economizer is not operated independently, the adjustment of the parameters affects the thermal efficiency of the power station boiler, the regenerative steam extraction distribution of the steam turbine and the change of the service power, and the influence range is wide and the mechanism is complex. Analysis shows that the core adjusting parameter of the power station waste heat recovery system is the air temperature from the outlet of the air heater to the air preheater. The lowest air temperature for ensuring that the heating surface at the tail part of the boiler does not generate low-temperature corrosion is taken as a reference, the air temperature at the outlet of the air preheater is raised, and the beneficial effects are as follows: 1) the higher the temperature of air entering the boiler is, the better the combustion of the boiler is, and the thermal efficiency of the boiler is improved; 2) the outlet of the lifting air preheater discharges smoke, the waste heat recovery amount of the low-temperature economizer is improved, and the adverse effect is as follows: 1) the consumption of heat source steam quantity is increased, and the work-doing capacity of a steam turbine is reduced; 2) the outlet of the air preheater is lifted to discharge smoke, and the heat efficiency of the boiler is reduced. Therefore, the optimal inlet air temperature is provided, the overall energy efficiency of the boiler and the steam turbine is considered, and the overall economy of the unit is optimal.
The related research on a power station waste heat recovery system consisting of a fan heater and a low-temperature economizer is more, and the related research respectively relates to the aspects of a thermodynamic system technical scheme and design, fan heater anti-freezing, performance test and correction method and the like. However, there are few published reports on the relevant research on the optimum air temperature at the outlet of the air preheater.
The method is characterized in that the method comprises the following steps of document 'optimization of parameters of a combined system of a low-temperature economizer and a fan heater [ J ]. thermal power generation 2018,47(03), Zhangxiang and the like', the influence of the heat exchange area of the low-temperature economizer and the air temperature at the outlet of the fan heater on the coal saving quantity, the static investment and the static investment recovery period of the whole system is calculated, and the change rule that the static investment recovery period of the combined system is firstly reduced and then increased along with the increase of the air temperature at the outlet of the fan heater is obtained.
The method is characterized in that a technical method of a field thermal performance test is adopted, a certain 300 MW-grade unit of a hot water air heater and low-temperature economizer combined system is taken as a research object, the lowest value of power supply coal consumption is taken as an optimization objective function, and changes of boiler thermal efficiency, steam turbine heat consumption rate and plant power consumption are measured to obtain the optimal air temperature.
The method is characterized by comprising the following steps of taking a certain subcritical 330MW unit as an example, establishing a complete model containing a boiler, a steam turbine and a generator by adopting Ebsilon software, performing thermal characteristic simulation on a conventional low-temperature economizer, a combined system of the heater and the low-temperature economizer on the basis of the model, and analyzing the characteristic change of the combined system when different outlet air temperatures of the heater are designed in an emphasized manner, and the influence of the characteristic change on the heat consumption rate of the steam turbine, the boiler efficiency, the power generation coal consumption, the auxiliary machine power consumption and the power supply coal consumption. The change rule of the power supply coal consumption reduction value along with the outlet air temperature of the air heater is obtained: the power supply coal consumption reduction amplitude increases along with the increase of the wind temperature, but the energy saving amount does not increase any more after the wind temperature is increased to a certain degree.
In summary, the existing research adopts two types of field thermal tests or numerical simulation, the field thermal test takes the lowest value of coal consumption of power supply as an objective function, tests the thermal efficiency of the boiler, the heat consumption rate of the steam turbine and the plant power consumption rate under different air temperature conditions, and obtains the optimal air temperature value, the method has high accuracy, follows the existing industry standard to test the performance of the boiler and the steam turbine, has higher requirements on test conditions, system isolation, measurement point installation, working condition adjustment, data arrangement, subsequent correction calculation and the like, has more input manpower and material resources, and has relatively low operability and popularization; the method has the advantages that the workload is relatively low, the operability and the popularization degree are high, however, under partial load or even low-load working conditions, values of boundaries of the boiler, the steam turbine and the thermodynamic system, such as steam extraction pressure loss, heater end difference, pump efficiency and the like, in theoretical modeling calculation have certain deviation according to design data of equipment manufacturers and actual operation, and theoretical calculation results deviate from actual real values. Moreover, the method requires that the practitioner have certain levels of data processing, calculation, correction and theoretical modeling calculation, and common power industry technical workers do not have the requirements except college students and electric academy professional technicians, so that the popularization and application of the optimization method are limited to a certain extent.
In conclusion, an online determination method for the optimal furnace inlet air temperature of the thermal power generating unit, which has strong operability and high accuracy and meets the actual operation condition of the specific unit, is needed.
Disclosure of Invention
The invention aims to solve the problems of large workload, deviation of partial working conditions from actual results, high operation requirements and the like in the conventional optimal inlet air temperature optimizing method for a thermal power generating unit, and provides a system and a method for determining the optimal inlet air temperature of the thermal power generating unit with a heater.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a method for determining the optimal inlet air temperature of a thermal power generating unit with a heater comprises the following steps:
step 1, establishing a representation parameter of the optimal inlet air temperature of a thermal power generating unit with a heater;
step 2, according to boundary parameters, the boiler inlet coal quantity B and the ambient air temperature taCarrying out test working condition planning;
step 3, supplying power to load N by thermal power generating unitnetAnd the highest value is used as a guide, and the optimal furnace entering air temperature of each test working condition is determined.
A system for determining the optimal inlet air temperature of a thermal power generating unit with a heater comprises the following steps:
the device comprises a characterization parameter establishing module, a parameter setting module and a parameter setting module, wherein the parameter establishing module is used for establishing a characterization parameter of the optimal furnace inlet air temperature of a thermal power generating unit with a heater;
a test condition defining module for defining the coal quantity B at the boiler inlet and the ambient air temperature t according to boundary parametersaCarrying out test working condition planning;
the wind temperature determination module is used for supplying power to the load N with the thermal power generating unitnetAnd determining the optimal furnace inlet air temperature under each test working condition by taking the highest value as a guide.
The device for determining the optimal inlet air temperature of the thermal power generating unit with the air heater comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the computer program to realize the steps of the method.
A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method as described above.
Compared with the prior art, the invention has the following beneficial effects:
the method adopts field operation data, takes the highest power supply load of the thermal power generating unit under the conditions of the coal amount at the boiler inlet and the ambient temperature as an optimization objective function, adopts a single variable comparison method, adjusts the furnace inlet air temperature of the thermal power generating unit in a mode of steam or hot water flow at the hot side of a fan heater, compares the power supply load of the thermal power generating unit with a reference working condition, and if the power supply load is smaller than the reference working condition, the original reference working condition is still used as the reference working condition; if the air temperature is larger than the reference value, the corresponding operation working condition of the inlet air temperature is used as a new reference working condition, and the inlet air temperature is adjusted by the unit to perform next iteration optimization. The method takes the maximum power supply load of the thermal power generating unit under the conditions of the coal amount at the boiler inlet and the ambient temperature as an optimization objective function, and obtains the optimal control value of the boiler inlet air temperature of the thermal power generating unit under the boundary conditions of different boiler inlet coal amounts, ambient temperatures and the like on line, thereby achieving the purposes of maximum power supply load and maximum profitability.
Drawings
In order to more clearly explain the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of a combined steam air heater and low-temperature economizer system.
Fig. 2 is a schematic diagram of a combined system of a hot water air heater and a low-temperature economizer.
Fig. 3 is a flow chart for determining the optimal inlet air temperature of the thermal power generating unit equipped with the air heater.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually arranged when the product of the present invention is used, the description is merely for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, cannot be understood as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 3, an embodiment of the present invention discloses a method for determining an optimal furnace inlet air temperature of a thermal power generating unit equipped with a heater, including the following steps:
step 1, establishing a representation parameter of the optimal inlet air temperature of a thermal power generating unit with a heater
A boiler, a steam turbine, a generator, related auxiliary machines and a thermodynamic system of the thermal power generating unit are regarded as a whole, coal is input at the boiler side, and output is power supply load of an outlet of a main transformer.
The power supply coal consumption is defined as unit standard coal consumption under unit power supply, g/kWh comprehensively reflects the ratio of boiler heat efficiency, steam turbine heat consumption rate and auxiliary machine total power consumption to generator output power, and is calculated after heat efficiency, steam turbine heat consumption rate and plant power consumption rate are respectively measured through boiler, steam turbine and plant power thermodynamic tests.
The invention slightly converts the calculation formula of the power supply coal consumption, and uses the power supply load N under the given condition of the boiler coal charging quantity BnetAnd the temperature is used as a characterization parameter of the optimal furnace inlet air temperature of the thermal power generating unit with the air heater.
Thermal power generating unit power supply load definition NnetThe total power consumption of auxiliary equipment (coal mills, fans, pumps and the like) of the unit, a maintenance lighting system and the like is subtracted from the output power of the generator outlet, and the main transformer outlet can be directly read in a DCS (distributed control system) of the thermal power generating unit.
The coal quantity B at the inlet of the boiler is given, the steam flow is heated by changing the air heater, the air temperature at the outlet is changed, and the power supply load N under different working conditions is readnetTo supply a power load NnetThe air temperature at the outlet of the air heater corresponding to the highest value is used as the optimal air temperature control under the coal quantityAnd (5) value making.
Step 2, according to boundary parameters, the boiler inlet coal quantity B and the ambient air temperature taAnd marking test conditions.
The method for counting the operation data of the thermal power generating unit in the last year mainly comprises the following steps:
boiler inlet coal amount B: bmin、Bmax
Ambient air temperature ta：ta、min、ta、max
According to the coal quantity B at the inlet of the boiler and the ambient air temperature taThe distribution of (A) is divided according to the following principle:
①Bmin、Bmin+(Bmax-Bmin)×0.2
Bmin+(Bmax-Bmin)×0.4
Bmin+(Bmax-Bmin)×0.6
Bmin+(Bmax-Bmin)×0.8
Bmax
②ta、min
ta、min+(ta、max-ta、min)×0.2
ta、min+(ta、max-ta、min)×0.4
ta、min+(ta、max-ta、min)×0.6
ta、min+(ta、max-ta、min)×0.8
ta、max
in summary, according to the method for defining the optimal working condition of the present invention, the optimal furnace inlet air temperature online determination working condition is 5 × 5 to 25 groups in total.
Step 3, supplying power to load N by thermal power generating unitnetAnd determining the optimal furnace inlet air temperature under each test working condition by taking the highest value as a guide.
During the optimizing test, the coal quality at the boiler inlet is not changed.
Second, the coal quantity B at the boiler inlet of the thermal power generating unit and the ambient temperature taGiven that the number of the first and second sets of data,after the air heater and the low-temperature economizer system are put into operation, when the average wall temperature of the cold end of the air preheater of the unit is equal to a design value, the unit operation parameters are adjusted, and after the unit operation parameters are stabilized for 30min, the inlet air temperature t of the air preheater is recorded0Power supply load Nnet0。
Third, the temperature t of the outlet air of the air heater based on the standard working condition0Taking the flow rate of steam or hot water at the inlet side of a heat source of the air heater as a reference, raising the air temperature at the outlet of the air heater at the amplitude of 2 ℃ each time, controlling the coal quantity B at the inlet of the boiler to be unchanged, adjusting the operation parameters of a unit, stabilizing for 30min, and recording a power supply load Nnet1。
Will Nnet1And Nnet0By comparison, if Nnet1≤Nnet0The original reference working condition is still used as the reference working condition; if N is presentnet1＜Nnet0And taking the corresponding operation working condition of the air temperature at the outlet of the air heater as a new comparison reference working condition, and continuously lifting the air temperature at the outlet of the air heater by the range of 2 ℃ every time to perform next optimization iteration.
Fourthly, the air temperature at the outlet of the air heater is raised until the outlet air temperature t corresponding to the maximum value of the flow of the steam or the hot water at the hot side of the air heatermaxThe seek operation ends. In the process, the maximum value N of the power supply load of the thermal power generating unitnetThe corresponding operation working condition is the optimal working condition, and at the moment, the air temperature at the outlet of the air heater is the optimal control value.
Sixthly, the optimal furnace entering air temperature determination of the remaining 14 working conditions is completed to obtain the coal entering quantity B and the environmental air temperature t of the thermal power generating unit at different furnace entering quantitiesaThe optimal furnace entering air temperature value is as follows.
And 4, applying the optimizing result to production energy-saving excavation guidance.
The optimal furnace inlet air temperature value of the 25 working conditions is calculated according to the coal quantity B at the inlet of the boiler and the ambient air temperature taAs a variable, at an ambient air temperature taWhen given, drawing the optimal furnace inlet air temperature along with the coal quantity B at the boiler inlet; when the coal quantity B at the boiler inlet is given, drawing the optimal inlet air temperature along with the ambient air temperature taThe change curve of (2).
In production operation, technicians can obtain the coal quantity B at the boiler inlet and the ambient air temperature taAll-grass of HoveniaCounting, and obtaining the coal quantity B at different boiler inlets and different environmental temperatures t of the thermal power generating unit according to a linear interpolation or extrapolation methodaThe optimal furnace entering air temperature value is used for achieving the purposes of highest power supply load and maximization of profitability.
If the coal quality at the boiler inlet changes, the operations are required to be carried out again so as to determine the coal quantity B at different boiler inlets and different environmental temperatures t of the thermal power generating unitaThe optimal furnace entering air temperature value is as follows.
The schematic diagram of the device for determining the optimal inlet air temperature of the thermal power generating unit provided with the air heater provided by the embodiment of the invention is provided. The device for determining the optimal inlet air temperature of the thermal power generating unit with the air heater in the embodiment comprises: a processor, a memory, and a computer program stored in the memory and executable on the processor. The processor, when executing the computer program, performs the steps of the various method embodiments described above, such as the steps shown in fig. 3. Alternatively, the processor implements the functions of the modules/units in the above device embodiments when executing the computer program.
The computer program may be partitioned into one or more modules/units that are stored in the memory and executed by the processor to implement the invention.
The determination device for the optimal inlet air temperature of the thermal power generating unit with the air heater can be a desktop computer, a notebook computer, a palm computer, a cloud server and other computing devices. The device for determining the optimal inlet air temperature of the thermal power generating unit with the air heater can comprise, but is not limited to, a processor and a memory.
The processor may be a Central Processing Unit (CPU), other general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, etc.
The memory can be used for storing the computer program and/or the module, and the processor realizes various functions of the determining device for the optimal inlet air temperature of the thermal power generating unit with the air heater by running or executing the computer program and/or the module stored in the memory and calling the data stored in the memory.
The module/unit integrated with the device for determining the optimal inlet air temperature of the thermal power generating unit with the air heater can be stored in a computer readable storage medium if the module/unit is realized in the form of a software functional unit and is sold or used as an independent product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer memory, Read-only memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, etc. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
The present invention has been described in terms of the preferred embodiment, and it is not intended to be limited to the embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. A method for determining the optimal inlet air temperature of a thermal power generating unit with a heater is characterized by comprising the following steps:
step 1, establishing a representation parameter of the optimal inlet air temperature of a thermal power generating unit with a heater; the method comprises the following specific steps:
by the amount of coal charged into the boilerBSupply load under given conditionsN net The temperature of the optimal inlet air of the thermal power generating unit is used as a characterization parameter of the optimal inlet air temperature of the thermal power generating unit with the air heater;
power supply load of thermal power generating unitN net Subtracting the total power consumption of the auxiliary equipment of the unit and the overhaul lighting system from the output power of the generator outlet;
the power supply load of different working conditions is read by changing the flow of steam or hot water heated by the air heater and the air temperature at the outletN net To supply power loadN net The air temperature of the outlet of the air heater corresponding to the highest value is used as the optimal air temperature control value under the coal quantity;
step 2, according to boundary parameter boiler inlet coal quantityBAnd ambient air temperaturet a Carrying out test working condition planning; the method comprises the following specific steps:
the method for counting the operation data of the thermal power generating unit in the last year mainly comprises the following steps:
amount of coal at boiler inletB：B min 、B max
Ambient temperaturet a ：t a、min 、t a、max
According to the amount of coal at the inlet of the boilerBAnd ambient air temperaturet a The distribution of (A) is divided according to the following principle:
①B min 、B min +(B max -B min )×0.2
B min +(B max -B min )×0.4
B min +(B max -B min )×0.6
B min +(B max -B min )×0.8
B max
②t a、min
t a、min +( t a、max - t a、min )×0.2
t a、min +( t a、max - t a、min )×0.4
t a、min +( t a、max - t a、min )×0.6
t a、min +( t a、max - t a、min )×0.8
t a、max
obtaining a plurality of groups of optimal furnace entering air temperature online determination working conditions;
step 3, supplying power load by the thermal power generating unitN net And the highest value is used as a guide, and the optimal furnace entering air temperature of each test working condition is determined.
2. The method for determining the optimal inlet air temperature of the thermal power generating unit with the air heater according to claim 1, wherein the step 3 is specifically as follows:
3-1) during the optimization test, the coal quality at the boiler inlet is given and unchanged;
3-2) coal amount at boiler inlet of thermal power generating unitBAnd ambient air temperaturet a Setting, taking the time when the average wall temperature of the cold end of the air preheater of the unit is equal to the design value as a reference working condition after the air heater and the low-temperature economizer system are put into operation, adjusting the operation parameters of the unit, and recording the air temperature at the inlet of the air preheater after the operation parameters are stabilized for 30mint 0 Power supply loadN net0 ；
3-3) air temperature at outlet of air heater based on reference working conditiont 0 By taking the coal as a reference, the flow of steam or hot water at the inlet side of a heat source of the air heater is adjusted to raise the air temperature at the outlet of the air heater by 2 ℃ at each time, and the coal amount at the inlet of the boiler is controlledBKeeping unchanged, adjusting unit operation parameters, and recording power supply load after stabilization for 30minN net1 ；
Will be provided withN net1 AndN net0 in comparison, ifN net1 ≤N net0 The original reference working condition is still used as the reference working condition; if it isN net1 ＞N net0 Taking the corresponding operation working condition of the air temperature at the outlet of the air heater as a new comparison reference working condition, continuously lifting the air temperature at the outlet of the air heater by the range of 2 ℃ each time, and performing the next optimization iteration;
3-4) lifting the outlet air temperature of the air heater until the outlet air temperature corresponding to the maximum flow of steam or hot water at the hot side of the air heatert max Until then, the optimizing operation is finished; the maximum value of the power supply load of the thermal power generating unit in the processN net The corresponding operation working condition is the optimal working condition, and at the moment, the air temperature at the outlet of the air heater is the optimal control value;
3-5) completing the determination of the optimal charging air temperature under the residual working conditions to obtain the coal charging amount of the thermal power generating unit at different charging timesBAnd ambient air temperaturet a The optimal furnace entering air temperature value is as follows.
3. The method for determining the optimal inlet air temperature of the thermal power generating unit with the air heater according to claim 1, further comprising:
step 4, applying the optimizing result to production energy-saving excavation and submergence guidance;
all the working conditions areThe optimal value of the air temperature entering the boiler is calculated by the coal quantity at the inlet of the boilerBAnd ambient air temperaturet a As a variable, at ambient air temperaturet a When given, the optimal inlet air temperature is drawn according to the coal amount at the boiler inletBThe variation curve of (d); coal quantity at boiler inletBWhen given, the optimal temperature of the air entering the furnace is drawn according to the ambient temperaturet a The change curve of (2).
4. A system for determining the optimal inlet air temperature of a thermal power generating unit with a heater is characterized by comprising the following steps:
the device comprises a characterization parameter establishing module, a parameter setting module and a parameter setting module, wherein the parameter establishing module is used for establishing a characterization parameter of the optimal furnace inlet air temperature of a thermal power generating unit with a heater; the characterization parameters are obtained by the following method:
by the amount of coal charged into the boilerBSupply load under given conditionsN net The temperature of the optimal inlet air of the thermal power generating unit is used as a characterization parameter of the optimal inlet air temperature of the thermal power generating unit with the air heater;
power supply load of thermal power generating unitN net Subtracting the total power consumption of the auxiliary equipment of the unit and the overhaul lighting system from the output power of the generator outlet;
the flow of steam or hot water heated by the air heater is changed, the air temperature at the outlet is changed, and the power supply loads under different working conditions are readN net To supply power loadN net The air temperature of the outlet of the air heater corresponding to the highest value is used as the optimal air temperature control value under the coal quantity;
a test condition demarcating module for demarcating the amount of coal at the boiler inlet according to the boundary parametersBAnd ambient air temperaturet a Carrying out test working condition planning; the test condition is obtained by the following method:
the method for counting the operation data of the thermal power generating unit in the last year mainly comprises the following steps:
amount of coal at boiler inletB：B min 、B max
Ambient temperaturet a ：t a、min 、t a、max
According to the amount of coal at the inlet of the boilerBAnd ambient air temperaturet a The distribution of (A) is divided according to the following principle:
①B min 、B min +(B max -B min )×0.2
B min +(B max -B min )×0.4
B min +(B max -B min )×0.6
B min +(B max -B min )×0.8
B max
②t a、min
t a、min +( t a、max - t a、min )×0.2
t a、min +( t a、max - t a、min )×0.4
t a、min +( t a、max - t a、min )×0.6
t a、min +( t a、max - t a、min )×0.8
t a、max
obtaining a plurality of groups of optimal furnace entering air temperature online determination working conditions;
the wind temperature determination module is used for supplying power to the load by the thermal power generating unitN net And determining the optimal furnace inlet air temperature under each test working condition by taking the highest value as a guide.
5. An apparatus for determining an optimal inlet air temperature of a thermal power generating unit equipped with a heater, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method according to any one of claims 1 to 3 when executing the computer program.
6. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 3.
CN202110694537.2A 2021-06-22 2021-06-22 System and method for determining optimal inlet air temperature of thermal power generating unit with air heater Active CN113280508B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102401393A (en) * 2010-09-07 2012-04-04 上海成信建业节能科技有限公司 Exhaust waste heat recycling system of power plant boiler
CN104615853A (en) * 2014-12-31 2015-05-13 华中科技大学 Thermal power generating unit coal blending co-combustion effect online evaluation method
CN206449679U (en) * 2016-09-28 2017-08-29 河南省电力勘测设计院 A kind of varying duty Secondary Air constant temperature system
CN109539561A (en) * 2018-10-23 2019-03-29 山西大学 A kind of fuel oil type full-automatic air heater
CN110553245A (en) * 2018-06-01 2019-12-10 中国电力工程顾问集团华北电力设计院有限公司 System for improving wide-load operation thermal efficiency of coal-fired unit
CN112856472A (en) * 2021-03-31 2021-05-28 西安热工研究院有限公司 Comprehensive utilization system and method for flue gas waste heat of thermal power generating unit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102401393A (en) * 2010-09-07 2012-04-04 上海成信建业节能科技有限公司 Exhaust waste heat recycling system of power plant boiler
CN104615853A (en) * 2014-12-31 2015-05-13 华中科技大学 Thermal power generating unit coal blending co-combustion effect online evaluation method
CN206449679U (en) * 2016-09-28 2017-08-29 河南省电力勘测设计院 A kind of varying duty Secondary Air constant temperature system
CN110553245A (en) * 2018-06-01 2019-12-10 中国电力工程顾问集团华北电力设计院有限公司 System for improving wide-load operation thermal efficiency of coal-fired unit
CN109539561A (en) * 2018-10-23 2019-03-29 山西大学 A kind of fuel oil type full-automatic air heater
CN112856472A (en) * 2021-03-31 2021-05-28 西安热工研究院有限公司 Comprehensive utilization system and method for flue gas waste heat of thermal power generating unit

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