CN111047206B - Evaluation system for ash scale prevention and control coating of air cooler and performance analysis method - Google Patents

Evaluation system for ash scale prevention and control coating of air cooler and performance analysis method Download PDF

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CN111047206B
CN111047206B CN201911312346.4A CN201911312346A CN111047206B CN 111047206 B CN111047206 B CN 111047206B CN 201911312346 A CN201911312346 A CN 201911312346A CN 111047206 B CN111047206 B CN 111047206B
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air
finned tube
heat exchange
ash
steel
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CN111047206A (en
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赵波
王志慧
曹生现
王晓旭
范思远
孙天一
吕昌旗
姚显双
王恭
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Northeast Electric Power University
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Northeast Dianli University
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    • G06—COMPUTING; CALCULATING OR COUNTING
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    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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Abstract

An air cooler ash scale prevention and control coating evaluating system and a performance analysis method are provided, wherein the system comprises: the water outlet of the constant-temperature water bath kettle is connected with a circulating pump, the water outlet of the circulating pump is connected with the water inlet of a steel-based aluminum finned tube, the air outlet of the steel-based aluminum finned tube is provided with an air outlet air temperature sensor and an air outlet air speed sensor, the water outlet of the steel-based aluminum finned tube is connected with the water inlet of the constant-temperature water bath kettle, the water inlet temperature sensor is arranged at the water inlet of the steel-based aluminum finned tube, the water outlet temperature sensor is arranged at the water outlet of the steel-based aluminum finned tube, an axle air cooler is arranged under a windproof plate, an ash spraying valve is connected with an ash blowing motor, the ash blowing motor is connected with an ash scattering device, the temperature sensor is connected with a data recorder through a sensor data transmission line, and the data recorder is connected with an upper computer. The system is reasonable in structure and good in practicability, and can display the operation condition and the dust deposition condition in real time. The performance analysis method is scientific and reasonable, high in applicability, reliable and accurate.

Description

Evaluation system for ash scale prevention and control coating of air cooler and performance analysis method
Technical Field
The invention relates to the field of forced convection heat transfer of air heat exchangers of power plants, in particular to an evaluation system and a performance analysis method for an ash scale prevention and control coating of an air cooler.
Background
In the power generation system of a power plant, an air cooling heat exchanger, an air cooler for short, is a main device of a cold end system of a direct air cooling power station, and the working performance of the air cooling heat exchanger has a decisive effect on the safety and the economy of a unit. The air cooler is applied to an external environment with sand wind and dust, the channel of the fin structure is narrow, dust is easily accumulated on the surface of the fin, the effective heat dissipation capacity of a dust accumulation area is reduced, the heat exchange coefficient is reduced by 5% -20%, the flow of condensed steam is reduced, the backpressure of a unit is raised by 5% -10%, and further potential safety hazards are brought to the operation of the generator set.
The prevention and control of the dust deposition on the heat exchange surface becomes an important research direction for slowing down the reduction of the heat exchange efficiency in the operation of the air cooler. At present, two methods for reducing the heat exchange efficiency caused by the problem of dust deposition of the air cooler are mainly adopted: (1) the regular water cleaning method, namely the heat exchange efficiency of the air cooler is reduced by 15-20%, and the finned tube of the heat exchanger is washed by high-pressure water, so that the cleaning effect is good, the heat exchange efficiency is recovered to more than 99%, and the defects that a large amount of water resources are wasted and the finned tube of the heat exchanger is corroded are overcome; (2) the method is characterized by comprising the steps of carrying out periodic high-pressure air purging, namely reducing the heat exchange efficiency of the air cooler by 5-15%, and blowing high-pressure air to the heat exchange surface of the air cooler vertically, wherein the method has the advantages of saving a large amount of water resources, recovering the heat exchange efficiency to more than 95%, and having the defects that the high-pressure air easily causes deformation of heat exchange finned tubes and generates a large amount of noise; (3) the method for preventing and controlling the dust deposition on the modified heat exchange surface has the advantages that the heat exchange efficiency is over 80 percent during the one-year operation of the air cooler, the cleaning cost and the water resource are saved, and the defect is that the method for evaluating the performance of preventing and controlling the dust deposition on the modified heat exchange surface is complex.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the coating evaluation system for preventing and treating the ash scale of the air cooler, which has a reasonable structure and good practicability and can display the operation working condition and the ash deposition condition in real time; and the performance analysis method of the air cooler ash scale prevention and control coating evaluation system is scientific, reasonable, high in applicability, reliable and accurate.
One of the technical schemes adopted for realizing the purpose of the invention is as follows: the utility model provides an air cooler ash scale prevention and cure cladding material evaluation system which characterized by, it includes: the water outlet of the constant temperature water bath kettle is connected with a circulating pump through a water inlet pipeline, the water outlet of the circulating pump is connected with the water inlet of a steel-based aluminum finned tube through a water inlet pipeline, an air outlet air temperature sensor is arranged right above the air outlet of the steel-based aluminum finned tube, an air outlet air speed sensor is arranged right above the air outlet of the steel-based aluminum finned tube, the water outlet of the steel-based aluminum finned tube is connected with the water inlet of the constant temperature water bath kettle through a water outlet pipeline, a water inlet temperature sensor is arranged near the water inlet of the steel-based aluminum finned tube, a water outlet temperature sensor is arranged near the water outlet of the steel-based aluminum finned tube, an axial air cooler is arranged right below a windproof plate, an ash spraying valve is connected with an ash spraying motor through an ash spraying channel, the ash spraying motor is connected with an ash spraying device through a long ash spraying channel, the water inlet temperature sensor, the water outlet temperature sensor, the air inlet air temperature sensor and the air outlet air temperature sensor are connected with a data recorder through sensor data transmission line, the data recorder is connected with the upper computer.
The steel-based aluminum finned tube is structurally characterized in that the steel-based aluminum finned tube is vertically arranged, an elliptic cylinder carbon steel container is arranged between a water inlet of the steel-based aluminum finned tube and a water outlet of the steel-based aluminum finned tube, and the steel-based aluminum finned tube is provided with wave-shaped aluminum fins to form a convection heat exchange channel.
Spill grey ware's structure be, can dismantle the funnel and be connected with the funnel that can dismantle under through double-deck transparent organic glass pipe, be the stirring wire suspension under the ash leakage mouth, the stirring wire suspension passes through the lantern ring and stirs the silk and be connected, the stirring silk passes ash leakage mouth and variable speed direct current motor's fan blade contact, spill grey ware and spill grey passageway through the support and be connected with the low resistance, the support has the supporting role.
The second technical scheme adopted for realizing the purpose of the invention is as follows: the utility model provides an air cooler ash scale prevention and cure cladding material evaluation system which characterized by: the performance analysis method comprises the following steps of calculating the ash deposition state parameters of the air cooler under any working condition through a heat balance equation:
according to the heat balance principle, the heat exchange quantity of the air cooler, the heat release quantity of hot water in the steel-based aluminum fin tube and the heat absorption quantity of cooling air are equal.
Qw＝Gw×Cp,w×ΔTw (1)
Qg＝Gg×Cp,g×ΔTg (2)
In the formula: qwThe heat release, Q, of hot water of the steel-based aluminum finned tubegFor cooling the air heat absorption, GwIs the mass flow rate of water, Cp,wIs the specific heat capacity of water, Δ TwIs the temperature rise of water, GgIs the mass flow rate of air, Cp,gIs the specific heat capacity of air, Δ TgTo cool the air temperature rise.
The mass flow calculation formula of water is as follows:
Gw＝ρwqw (3)
in the formula: rhowIs the density of water, qwIs the volumetric flow rate of water.
The mass flow of air is calculated by the formula:
Gg＝ρgvgs (4)
in the formula: rhogIs the density of air, vgIs the wind speed and s is the frontal area.
Average value of heat exchange amount QaComprises the following steps:
Figure BDA0002324875710000021
logarithmic mean temperature difference Δ T0Comprises the following steps:
Figure BDA0002324875710000031
in the formula: t is tg1For cooling the temperature of air at the air inlet of the steel-based aluminum finned tube, tg2For cooling the temperature t of air at the air outlet of the steel-based aluminum finned tubenThe temperature of the water inlet of the steel-based aluminum finned tube.
The heat exchange thermal resistance R of the steel-based aluminum finned tube is calculated by the formula:
Figure BDA0002324875710000032
in the formula: f is the total heat exchange area.
Heat exchange state parameter
Figure BDA0002324875710000036
Is used for representing the heat exchange change state and the heat exchange state parameters of the heat exchange surface of the air cooler
Figure BDA0002324875710000037
Comprises the following steps:
Figure BDA0002324875710000033
in the formula: r1Is the heat exchange thermal resistance R of the heat exchange finned tube in the state of dust deposition0The heat exchange thermal resistance of the heat exchange finned tube in a clean state.
Parameter of ash deposition
Figure BDA0002324875710000038
Is used for representing the ash deposition change state and the ash deposition state parameter of the heat exchange surface of the air cooler
Figure BDA0002324875710000039
Comprises the following steps:
Figure BDA0002324875710000034
in the formula: w1Is the dust weight per unit area on the surface of the fin of the heat exchange finned tube in a dust deposition state, W0Is the ash deposition weight W of the unit area on the surface of the fin of the heat exchange finned tube in a clean statefThe surface of the heat exchange finned tube is the deposited ash weight per unit area under the complete blockage state;
comprehensive parameter of accumulated dust of heat exchange finned tube
Figure BDA00023248757100000310
Figure BDA0002324875710000035
In the formula:
Figure BDA00023248757100000311
in order to keep the heat exchange finned tube in a clean state,
Figure BDA00023248757100000312
in order to ensure that the heat exchange finned tube is in a dust deposition state,
through the comprehensive parameters of the accumulated dust of the heat exchange finned tube in the state of accumulated dust
Figure BDA00023248757100000313
The surface dust deposition state of the heat exchange finned tubes with different coatings can be represented, and the aim of optimizing the coatings of the heat exchange fins is achieved.
The evaluation system for the ash scale prevention and control coating of the air cooler and the performance analysis method have the advantages that:
1) the ash spreader is designed ingeniously, the ash particles can be sprayed out uniformly in density and speed, the ash spreader comprises a detachable funnel-shaped container, a variable-speed direct-current motor, an ash blowing motor and a low-resistance organic glass ash spreading channel, the variable-speed direct-current motor is attached beside a leakage opening of the detachable funnel, a stirring wire driven by the variable-speed direct-current motor is connected in series in the leakage opening, the rotating speed of the variable-speed direct-current motor is adjusted, the stirring frequency of the stirring wire is changed along with the rotating speed, the ash spreading speed can be adjusted to be 14.6-14.9 mg/s by controlling the stirring frequency of the stirring wire, the designed ash spreading speed is basically 14.8mg/s, the ash spreader is connected with the ash blowing motor through an organic glass tube, and the ash blowing motor sends the ash particles to the position right above a shaft cooling fan through the ash spreading channel;
2) the finned tubes with 8-16 different heat exchange surfaces can be evaluated simultaneously, and the problem that the dust deposition on the heat exchange surfaces is influenced by the structural parameters (surface energy and surface roughness), the operating parameters (head-on wind speed) and the atmospheric property parameters (particle size and concentration of suspended particles) of the air cooler can be researched through a simulation heat exchange surface natural dust deposition experiment; the air cooler prevention and control dust deposition experimental device is simple in structure, convenient to detach conveniently carries out multiple verification experiments in succession, and the above-mentioned single parameter of accessible control develops air cooler variable structure parameter, variable running parameter, the experiment of becoming the dust deposition granule parameter, develops novel heat transfer surface's air cooler, develops air cooler comprehensive properties evaluation index, optimizes air cooler design and evaluation under the multiple criteria constraints such as ash dirt characteristic, heat transfer surface regulation and control cost and environmental impact.
3) A plurality of sensors are arranged at each wind speed and temperature measuring point, so that inaccurate measurement caused by sensor errors can be avoided; the air speed and temperature signals are transmitted by using a rising 32-path data recorder and adopting a Modbus Rtu communication protocol, so that the accuracy and safety of data transmission are ensured; the software for online monitoring the operation condition of the air cooler of the upper computer is compiled by C # language, the operation condition parameters of each finned tube of the experiment table, such as heat transfer coefficient and dust-deposition thermal resistance, are displayed in real time, and the operation condition of the experiment table and the dust-deposition prevention performance of each steel-based aluminum finned tube are more intuitively known.
4) Since the calculated value of the heat release of hot water and the calculated value of the heat absorption of cooling air in the steel-based aluminum finned tube may be different, a large error exists in the calculated logarithmic average temperature difference. The air cooler heat exchange performance analysis method calculates the iterative calculation value of the air temperature at the air outlet of the heat exchanger through numerical iteration, and can reduce the error between the calculation value of the heat exchange coefficient of the heat exchanger and the true value.
5) The air cooler ash scale prevention and control coating evaluation system is reasonable in structure and good in practicability, and can display the operation condition and the ash deposition condition in real time;
6) the performance analysis method of the air cooler ash scale prevention and control coating evaluation system is scientific and reasonable, strong in applicability, reliable and accurate.
Drawings
FIG. 1 is a schematic diagram of an evaluation system for an air cooler fin dust deposit prevention and control coating;
FIG. 2 is a schematic structural view of the steel-based aluminum finned tube 6 of FIG. 1;
FIG. 3 is a schematic view of the ash spreader 18 of FIG. 1;
FIG. 4 is a heat transfer coefficient chart of an air cooler fin dust deposition experiment;
FIG. 5 is a graph of the heat transfer coefficient change rate of an air cooler fin ash deposition experiment.
In the figure: 1 constant temperature water bath kettle, 2 water inlet pipes, 3 circulating pumps, 4 air outlet air speed sensors, 5 air outlet air temperature sensors, 6 steel-based aluminum finned tubes, 7 water inlet temperature sensors, 8 water outlet temperature sensors, 9 air inlet air temperature sensors, 10 water outlet pipes, 11-axis air coolers, 12 dust spraying valves, 13 sensor data transmission lines, 14 data recorders, 15 upper computers, 16 dust spraying channels, 17 dust blowing motors, 18 dust spraying devices, 19 steel-based aluminum finned tube water inlets, 20 steel-based aluminum finned tube water outlets, 21 steel-based aluminum finned tube air outlets, 22 steel-based aluminum finned tube waveform aluminum fins, 23 steel-based aluminum finned tube air inlets, 24 funnels, 253 mm diameter dust outlets, 26 stirring wire suspensions, 27 supports, 282 mm diameter dust outlets, 29 stirring wires, 30 variable speed direct current motors and 31 fan blades.
Detailed Description
The invention is further illustrated by the following figures and detailed description.
Referring to fig. 1, the coating evaluation system for preventing and treating the ash scale of the air cooler comprises: different modified steel-based aluminum finned tubes and original steel-based aluminum finned tubes are assembled in parallel, and organic glass plates are used for surrounding the modified steel-based aluminum finned tubes and the original steel-based aluminum finned tubes to form steel-based aluminum finned tubes 6. In order to simulate the Rankine cycle condensation process, the hot steam is replaced by 54 ℃ distilled water, and the distilled water is heated through the constant-temperature water bath 1. The water outlet of the constant-temperature water bath kettle 1 is connected with a circulating pump 3 through a water inlet pipeline 2, the water outlet of the circulating pump 3 is connected with a steel-based aluminum finned tube water inlet 19 through the water inlet pipeline 2, a steel-based aluminum finned tube water outlet 20 is connected with the constant-temperature water bath kettle 1, an axle air cooler 11 upwards generates cooling air, and the air speed of the axle air cooler 11 is controlled by a frequency converter. An air outlet air temperature sensor 5 is arranged 0.5cm above an air outlet 21 of the steel-based aluminum finned tube, an air outlet air speed sensor 4 is arranged 1cm above the air outlet 21 of the steel-based aluminum finned tube, and a water outlet 20 of the steel-based aluminum finned tube is connected with a water inlet of the constant-temperature water bath kettle 1 through a water outlet pipeline 10 to complete water circulation; the water inlet temperature sensor 7 is installed near a water inlet 19 of the steel-based aluminum finned tube, the water outlet temperature sensor 8 is installed near a water outlet 20 of the steel-based aluminum finned tube, 2 temperature sensors are used at each temperature measuring point, the shaft air cooler 11 is arranged under the windproof plate, the ash spraying valve 12 is connected with the ash blowing motor 17 through the ash spraying channel 16, the ash blowing motor 17 is connected with the ash sprayer 18 through the ash spraying channel 16 with the length of 8cm, and the ash blowing motor 17 sends ash particles to the position right above the shaft air cooler 11 through the ash spraying channel 16. The water inlet temperature sensor 7, the water outlet temperature sensor 8, the air inlet air temperature sensor 9 and the air outlet air temperature sensor 5 are connected with a data recorder 14 through sensor data transmission lines 13, the data recorder 14 is connected with an upper computer 15, and the upper computer displays parameters such as inlet and outlet air temperature, inlet and outlet water temperature, heat exchange coefficient, dust deposition thermal resistance and the like in real time.
The steel-based aluminum finned tube 6 is an elliptical steel-based aluminum finned tube, and is 50mm long, 50mm wide, 215mm high, 0.5mm thick, 20mm long and 2-3 mm fin spacing; the water flow in the water inlet pipeline is 0.0189L/s; the rotating speed of the shaft air cooler 11 is 300-1000 r/min; the ash spreader 18 spreads the ash at a rate of 14.8 mg/s.
The air outlet air speed sensor 4 is a thermal type pipeline air speed transmitter, the precision is +/-0.1 m/s, the range is 0-15 m/s, the working temperature is minus 10 ℃ to plus 50 ℃, and the measurement is more accurate compared with that of an impeller type anemometer; the air outlet air temperature sensor 5, the water inlet temperature sensor 7, the water outlet temperature sensor 8 and the air inlet air temperature sensor 9 are all K-shaped probe armored thermocouple sensors with the accuracy of +/-0.1 ℃.
The ash spreader 18 is composed of a detachable funnel, a variable speed direct current motor, an ash blowing motor and a low-resistance organic glass ash spreading channel, the variable speed direct current motor is attached beside a leakage opening of the detachable funnel, stirring wires driven by fan blades of the variable speed direct current motor are connected in series in the leakage opening, and the upper end of each stirring wire is connected with a stirring wire suspension frame.
Referring to fig. 2, the steel-based aluminum finned tube 6 is structurally characterized in that the steel-based aluminum finned tube 6 is vertically arranged, an elliptical cylinder carbon steel container is arranged between a water inlet 19 of the steel-based aluminum finned tube and a water outlet 20 of the steel-based aluminum finned tube, and the corrugated aluminum fins 22 of the steel-based aluminum finned tube form a convection heat exchange channel.
Referring to fig. 3, the ash spreader 18 has a structure that a detachable funnel 24 is connected with a detachable funnel right below through a double-layer transparent organic glass tube, a stirring wire suspension 26 is arranged right below a 3 mm-diameter ash discharge opening 25, the stirring wire suspension 26 is connected with a stirring wire 29 through a sleeve ring, the stirring wire 29 passes through a 2 mm-diameter ash discharge opening 28 and contacts with a fan blade 31 of a variable speed direct current motor 30, the ash spreader 18 is connected with a low-resistance ash spreading channel 16 through a support 27, and the support 27 has a supporting function.
According to the coating evaluation system for preventing and treating the ash scale of the air cooler, 5.4g of experimental ash is slowly placed in the detachable hopper 24 before the wind shield and the steel-based aluminum finned tube 6 are installed, the rotating speed of the variable speed direct current motor 30 is adjusted, namely the ash scattering speed of the ash scattering device 18 is adjusted, the debugging work of the ash scattering device 18 is completed after 6min of scattering of 5.4g of experimental ash, and the ash scattering device 18 is closed; the wind shield and the steel-based aluminum finned tube 6 are well installed, the constant-temperature water bath 1 is set to heat distilled water at 54 ℃, the circulating pump 3 is operated, the distilled water at 54 ℃ sequentially passes through the water outlet of the constant-temperature water bath 1, the circulating pump 3, the water inlet pipeline 2, the steel-based aluminum finned tube 6, the water outlet pipeline 10 and the water inlet of the constant-temperature water bath 1 to reach the water bath to complete heat circulation, and the data recorder 14 and the monitoring software of the upper computer 15 are started; adjusting the rotating speed of the shaft air cooler 11 to 1.9-2.1 m/s, reducing the temperature of the constant-temperature water bath kettle 1 by a certain range, and when the temperature sensor 7 at the water inlet displays 53.95-54.05 ℃, the air cooler experiment table reaches a balanced running state before ash deposition; open and spill grey ware 18, the laboratory bench gets into the simulation heat exchanger natural deposition state, through constantly placing the experiment ash in can dismantling funnel 24, 180 hours of laboratory bench continuous operation operating time can accomplish 180 ~ 182 sky cold ware natural deposition experiments.
The wind shield and the steel-based aluminum finned tube 6 are designed to be detachable, and the wind shield is a transparent organic glass plate, so that the dust deposition state of the steel-based aluminum finned tube 6 can be observed conveniently.
The experimental ash is compared with the field ash of a certain power plant in the south of Kogyo of Liaoning province, and the parameters of the experimental ash, such as chemical components, water content, particle size distribution and the like, reach the experimental standard.
The working process of the ash spreader 18 is as follows: experiment ash is slowly placed in a detachable funnel 24 and slowly leaks from an ash leakage opening 25 with the diameter of 3mm, a stirring wire is stirred by a fan blade 31 of a variable-speed direct-current motor 30, the experiment ash leaks from an ash leakage opening 28 with the diameter of 2mm at a certain speed, a low-resistance ash scattering channel 16 is connected with an ash blowing motor 17, and the experiment ash is sucked into the ash scattering channel 16 and is uniformly sprayed out to the position right above an axis air cooler 11 from an ash spraying valve 12.
The invention discloses a performance analysis method of an air cooler ash scale prevention and control coating evaluation system, which comprises the following steps:
and calculating the ash deposition state parameters of the air cooler under any working condition through a heat balance equation. According to the heat balance principle, the heat exchange quantity of the air cooler, the heat release quantity of hot water in the steel-based aluminum fin tube and the heat absorption quantity of cooling air are equal.
Qw＝Gw×Cp,w×ΔTw (1)
Qg＝Gg×Cp,g×ΔTg (2)
In the formula: qwThe heat release, Q, of hot water of the steel-based aluminum finned tubegFor cooling the air heat absorption, GwIs the mass flow rate of water, Cp,wIs the specific heat capacity of water, Δ TwIs the temperature rise of water, GgIs the mass flow rate of air, Cp,gIs the specific heat capacity of air, Δ TgTo cool the air temperature rise.
The mass flow calculation formula of water is as follows:
Gw＝ρwqw (3)
in the formula: rhowIs the density of water, qwIs the volumetric flow rate of water.
The mass flow of air is calculated by the formula:
Gg＝ρgvgs (4)
in the formula: rhogIs the density of air, vgIs the wind speed and s is the frontal area.
Average value of heat exchange amount QaComprises the following steps:
Figure BDA0002324875710000071
logarithmic mean temperature difference Δ T0Comprises the following steps:
Figure BDA0002324875710000072
in the formula: t is tg1Air is blown into the steel-based aluminum finned tube for cooling airTemperature of the mouth, tg2For cooling the temperature t of air at the air outlet of the steel-based aluminum finned tubenThe temperature of the water inlet of the steel-based aluminum finned tube.
The heat exchange thermal resistance R of the steel-based aluminum finned tube is calculated by the formula:
Figure BDA0002324875710000073
in the formula: f is the total heat exchange area.
Heat exchange state parameter
Figure BDA0002324875710000075
Is used for representing the heat exchange change state and the heat exchange state parameters of the heat exchange surface of the air cooler
Figure BDA0002324875710000078
Comprises the following steps:
Figure BDA0002324875710000074
in the formula: r1Is the heat exchange thermal resistance R of the heat exchange finned tube in the state of dust deposition0The heat exchange thermal resistance of the heat exchange finned tube in a clean state.
Parameter of ash deposition
Figure BDA0002324875710000076
Is used for representing the ash deposition change state and the ash deposition state parameter of the heat exchange surface of the air cooler
Figure BDA0002324875710000077
Comprises the following steps:
Figure BDA0002324875710000081
in the formula: w1Is the dust weight per unit area on the surface of the fin of the heat exchange finned tube in a dust deposition state, W0The weight of the deposited dust per unit area on the surface of the fin of the heat exchange finned tube in a clean state,Wfthe surface of the heat exchange finned tube is the deposited ash weight per unit area under the complete blockage state;
comprehensive parameter of accumulated dust of heat exchange finned tube
Figure BDA0002324875710000083
Figure BDA0002324875710000082
In the formula:
Figure BDA0002324875710000085
in order to keep the heat exchange finned tube in a clean state,
Figure BDA0002324875710000084
in order to ensure that the heat exchange finned tube is in a dust deposition state,
through the comprehensive parameters of the accumulated dust of the heat exchange finned tube in the state of accumulated dust
Figure BDA0002324875710000086
The surface dust deposition state of the heat exchange finned tubes with different coatings can be represented, and the aim of optimizing the coatings of the heat exchange fins is achieved.
The sensor and the data recorder are all commercially available products, and are easy to implement.
While the present invention has been described with reference to specific embodiments and methods of analysis, the present invention is not limited to the embodiments and methods, and any obvious modifications made by those skilled in the art in light of the teachings of the present invention are intended to be included within the scope of the present invention.

Claims (1)

1. An air cooler ash scale prevention and control coating evaluation system, it includes: the water outlet of the constant temperature water bath kettle is connected with a circulating pump through a water inlet pipeline, the water outlet of the circulating pump is connected with the water inlet of a steel-based aluminum finned tube through a water inlet pipeline, an air outlet air temperature sensor is arranged right above the air outlet of the steel-based aluminum finned tube, an air outlet air speed sensor is arranged right above the air outlet of the steel-based aluminum finned tube, the water outlet of the steel-based aluminum finned tube is connected with the water inlet of the constant temperature water bath kettle through a water outlet pipeline, a water inlet temperature sensor is arranged near the water inlet of the steel-based aluminum finned tube, a water outlet temperature sensor is arranged near the water outlet of the steel-based aluminum finned tube, an axial air cooler is arranged right below the steel-based aluminum finned tube, an ash spraying valve is connected with an ash spraying motor through an ash spraying channel, the ash spraying motor is connected with an ash spraying device through the ash spraying channel, and the water inlet temperature sensor, the water outlet temperature sensor, the air inlet air temperature sensor and the air outlet air temperature sensor are connected with a data recorder through sensor data transmission line, the data recorder is connected with an upper computer, and is characterized in that the performance analysis method of the data recorder is that the ash deposition state parameters of the air cooler under any working condition are calculated through a thermal balance equation:
according to the heat balance principle, the heat exchange quantity of the air cooler, the heat release quantity of hot water in the steel-based aluminum fin tube and the heat absorption quantity of cooling air are equal,
Qw＝Gw×Cp,w×ΔTw (1)
Qg＝Gg×Cp,g×ΔTg (2)
in the formula: qwThe heat release, Q, of hot water of the steel-based aluminum finned tubegFor cooling the air heat absorption, GwIs the mass flow rate of water, Cp,wIs the specific heat capacity of water, Δ TwIs the temperature rise of water, GgIs the mass flow rate of air, Cp,gIs the specific heat capacity of air, Δ TgRaising the temperature of the cooling air;
the mass flow calculation formula of water is as follows:
Gw＝ρwqw (3)
in the formula: rhowIs the density of water, qwIs the volume flow rate of the water and is,
the mass flow of air is calculated by the formula:
Gg＝ρgvgs (4)
in the formula: rhogIs the density of air, vgIs the wind speed, s is the frontal area,
average value of heat exchange amount QaComprises the following steps:
Figure FDA0003371156120000011
logarithmic mean temperature difference Δ T0Comprises the following steps:
Figure FDA0003371156120000012
in the formula: t is tg1For cooling the temperature of air at the air inlet of the steel-based aluminum finned tube, tg2For cooling the temperature t of air at the air outlet of the steel-based aluminum finned tubenThe temperature of the water inlet of the steel-based aluminum finned tube,
the heat exchange thermal resistance R of the steel-based aluminum finned tube is calculated by the formula:
Figure FDA0003371156120000021
in the formula: f is the total heat exchange area and is the total heat exchange area,
heat exchange state parameter
Figure FDA0003371156120000022
Is used for representing the heat exchange change state and the heat exchange state parameters of the heat exchange surface of the air cooler
Figure FDA0003371156120000023
Comprises the following steps:
Figure FDA0003371156120000024
in the formula: r1Is the heat exchange thermal resistance R of the heat exchange finned tube in the state of dust deposition0The heat exchange thermal resistance of the heat exchange finned tube in a clean state,
parameter of ash deposition
Figure FDA0003371156120000025
Is used for representing the ash deposition change state and the ash deposition state parameter of the heat exchange surface of the air cooler
Figure FDA0003371156120000026
Comprises the following steps:
Figure FDA0003371156120000027
in the formula: w1Is the dust weight per unit area on the surface of the fin of the heat exchange finned tube in a dust deposition state, W0Is the ash deposition weight W of the unit area on the surface of the fin of the heat exchange finned tube in a clean statefThe surface of the heat exchange finned tube is the deposited ash weight per unit area under the complete blockage state;
comprehensive parameter of accumulated dust of heat exchange finned tube
Figure FDA0003371156120000028
Figure FDA0003371156120000029
In the formula:
Figure FDA00033711561200000210
in order to keep the heat exchange finned tube in a clean state,
Figure FDA00033711561200000211
in order to ensure that the heat exchange finned tube is in a dust deposition state,
through the comprehensive parameters of the accumulated dust of the heat exchange finned tube in the state of accumulated dust
Figure FDA00033711561200000212
The surface dust deposition state of the heat exchange finned tubes with different coatings can be represented, and the aim of optimizing the coatings of the heat exchange fins is achieved.
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