CN110174134B - White smoke prevention intelligent detection method for wet desulphurization chimney - Google Patents

White smoke prevention intelligent detection method for wet desulphurization chimney Download PDF

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Publication number
CN110174134B
CN110174134B CN201910355942.4A CN201910355942A CN110174134B CN 110174134 B CN110174134 B CN 110174134B CN 201910355942 A CN201910355942 A CN 201910355942A CN 110174134 B CN110174134 B CN 110174134B
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chimney
temperature
atmospheric
smoke
white smoke
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CN110174134A (en
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金军
钱晓峰
赵朝阳
朱海明
徐伟
施鹏飞
周建伟
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Zhejiang Zheneng Jiahua Power Generation Co ltd
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Zhejiang Zheneng Jiahua Power Generation Co ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/02Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/06Arrangements of devices for treating smoke or fumes of coolers
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00Measuring or testing not otherwise provided for
    • G01D21/02Measuring two or more variables by means not covered by a single other subclass
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/30Technologies for a more efficient combustion or heat usage

Abstract

The invention discloses a white smoke prevention intelligent detection method for a wet desulphurization chimney, which comprises the following specific steps: s1, collecting 4 signals of atmospheric temperature, atmospheric relative humidity, atmospheric wind power and wind direction in real time by additionally arranging a detection instrument, and transmitting the signals to a control system; s2, introducing 4 signals of atmospheric temperature, atmospheric relative humidity, atmospheric wind power and wind direction into a calculation formula of 'actual chimney white smoke critical smoke temperature' by using the control system as 4 variables, and calculating to obtain the actual chimney white smoke critical smoke temperature; and S3, feeding the actual chimney white smoke critical temperature obtained by calculation back to the waste heat recovery system by the control system, and regulating and controlling the smoke temperature in the chimney in real time according to the actual chimney white smoke critical temperature to realize the maximization of recovered waste heat and the minimization of thermal pollution. The method of the invention is easy to realize, can greatly recover heat energy, save coal consumption, and can obviously improve the economy, reliability and environmental protection of the ultralow-emission operation of the coal-fired unit.

Description

White smoke prevention intelligent detection method for wet desulphurization chimney
Technical Field
The invention relates to the technical field of ultralow emission automatic control of coal-fired thermal power generating units, in particular to a white smoke prevention intelligent detection method for a wet desulphurization chimney.
Background
Along with the requirements of ultralow emission of coal-fired units and white smoke elimination in key areas, most of domestic coal-fired units are subjected to ultralow emission reconstruction, and a plurality of coal-fired units are additionally provided with tubular GGH smoke coolers and smoke heaters to realize ultralow emission and eliminate white smoke of a chimney to reduce the environmental influence of gypsum rain on peripheral areas. However, when a plurality of units operate at present, the smoke temperature is too high, which brings the problems of large heat loss, large auxiliary heating steam quantity, large smoke volume flow, high flow velocity, large resistance, high power consumption of a fan, low efficiency due to high flow velocity of electric dust removal, desulfuration and the like, and thermal pollution.
In order to save energy and reduce emission, tests show that the chimney white smoke has a certain relation with the atmospheric temperature, the atmospheric relative humidity, the wind power and the wind direction, the chimney smoke temperature can be far lower than the originally designed 80 ℃ for most of the time in one year, and the chimney smoke temperature can be kept to be free of the white smoke even if the chimney smoke temperature is lower than 63 ℃ in 3-10 months in southern areas, which fully indicates that the smoke waste heat still has a large recycling space. Therefore, the organic group is additionally provided with a flue gas waste heat recovery system to recover waste heat. However, such recovered heat energy is often blind, and chimney smoke temperature control is not based, so that heat energy waste due to overhigh temperature or white smoke due to overlow temperature is easy to occur.
Therefore, whether white smoke is likely to appear in the current chimney or not can be intelligently detected by the technology, so that the smoke temperature of the chimney can be automatically adjusted along with the atmospheric condition and tracked at the critical temperature point in real time, the ultra-low emission is realized, meanwhile, the waste heat is completely and deeply recovered, and the energy conservation maximization is realized.
Based on the situation, the invention provides an intelligent white smoke prevention detection method for a wet desulphurization chimney, which can effectively solve the problems.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an intelligent detection method for preventing white smoke of a wet desulphurization chimney. The white smoke prevention intelligent detection method for the wet desulphurization chimney overcomes the limitations of blind setting of chimney smoke temperature and manual setting of chimney smoke temperature parameters, has simple program structure, is easy to realize, can greatly recover heat energy, saves coal consumption, and can obviously improve the economy, reliability and environmental protection of ultralow emission operation of a coal-fired unit.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
an intelligent detection method for preventing white smoke of a wet desulphurization chimney is characterized in that through test and statistical data analysis, the relation between atmospheric temperature, atmospheric relative humidity, atmospheric wind power, wind direction and chimney white smoke critical smoke temperature is determined, so that a correlation formula is found and is led into a control system; taking the atmospheric temperature, the atmospheric relative humidity, the atmospheric wind power and the wind direction signal as variables, introducing a correlation formula and automatically calculating the current chimney white smoke critical smoke temperature in real time; giving the 'chimney white smoke critical smoke temperature' to a chimney smoke temperature target set value so as to realize automatic adjustment of the recovery capacity of the waste heat recovery system according to the chimney white smoke critical smoke temperature; the method comprises the following specific steps:
s1, acquiring 4 signals (or called data information) of atmospheric temperature, atmospheric relative humidity, atmospheric wind power and wind direction in real time by additionally arranging a detection instrument, and transmitting the signals to a control system (such as a computer or a server);
s2, the control system takes 4 signals of atmospheric temperature, atmospheric relative humidity, atmospheric wind power and wind direction as 4 variables and introduces the following calculation formula of 'actual chimney white smoke critical smoke temperature', and the actual chimney white smoke critical smoke temperature is calculated and obtained:
in the formula, T80: the upper limit value of the smoke temperature of the chimney is 80 ℃;
T63: the smoke temperature limit value of the chimney is 63 ℃;
t40: the upper limit of the atmospheric temperature is 40 ℃;
t10: the lower limit of the atmospheric temperature is 10 ℃;
ε1: an atmospheric relative humidity correction factor;
ε2: a wind power correction factor;
ε3: a wind direction correction factor;
and S3, feeding the actual chimney white smoke critical temperature obtained by calculation back to a waste heat recovery system (a smoke waste heat real-time deep recovery system) by the control system, and regulating and controlling the smoke temperature in the chimney in real time according to the actual chimney white smoke critical temperature to realize the maximization of the recovered waste heat and the minimization of thermal pollution.
The white smoke prevention intelligent detection method for the wet desulphurization chimney overcomes the limitations of blind setting of the chimney smoke temperature and manual setting of the chimney smoke temperature parameters, has simple program structure, is easy to realize, can greatly recover heat energy, saves coal consumption, and can obviously improve the economy, reliability and environmental protection of ultralow emission operation of a coal-fired unit.
The invention has the characteristics of simplicity, easy realization, obvious improvement on the economy and reliability of ultralow emission operation of the coal-fired unit, obvious effect on the economy and environment-friendly operation of the coal-fired unit and the like. The waste heat recovery automatic regulation and control device optimizes waste heat recovery automatic regulation and control, reduces a large amount of useless heat energy consumption, saves energy, reduces emission, and reduces environmental heat pollution at the same time. The invention has great popularization and reference significance for various wet desulphurization white smoke elimination coal-fired power generating units.
Preferably, the atmospheric relative humidity correction coefficient ∈ 1 is calculated by using the following formula:
in the formula, RHPractice ofIn the effective range: RH of 80-80 ≤Practice ofLess than or equal to 100, when the content is less than 80, the calculation is carried out according to 80;
δ 1: setting a correction maximum value within a set range of 0.1-0.3 when the relative humidity of the atmosphere is 100%;
100 refers to the upper limit of relative humidity of the atmosphere 100%, and 80 refers to the lower limit of the relative humidity influence of the atmosphere 80%.
More preferably, the δ 1: the maximum correction value set for the atmospheric relative humidity of 100% was set to 0.2.
Preferably, the wind power correction coefficient ∈ 2 is calculated by using the following formula:
WS valid Range: RH is not less than 5Practice ofLess than or equal to 15, and when the content is less than 5, calculating according to 5;
δ2: the set correction maximum value is 0.1-0.3 when the wind power is 15 m/s;
15 means the upper wind limit of 15m/s, 5 means the lower wind limit of 5 m/s.
More preferably, said delta2: the set correction maximum value is set to be 0.2 when the wind power is 15 m/s;
preferably, the wind direction correction coefficient ∈ 3 is calculated by using the following formula:
ε3=1.2
ε3=1.1
ε3=1.0
preferably, the waste heat recovery system is additionally provided with a first device (1) on the basis of the original design, namely a tubular GGH flue gas waste heat recovery water-water heat exchanger, a pipeline thereof and a number six regulating valve (f 6); a second device (2), namely a fourth regulating valve (f4) of a heat medium water inlet bypass of a tubular GGH flue gas heater, is additionally arranged on the basis of the original design; on the basis of the original design, a third device (3) is additionally arranged, namely an atmospheric temperature measuring point t, an atmospheric relative humidity measuring point RH, an atmospheric wind speed measuring point WS and an atmospheric wind direction measuring point on the periphery of the chimney
More preferably, the 'adding of the first equipment (1)' on the basis of the original design means that the waste heat in the heat medium water is recycled to the steam turbine condensed water by connecting a tubular GGH water-water heat exchanger in parallel or in series on the original tubular GGH heat medium water pipeline and adjusting through a six-number-of-tubular GGH water-water heat exchanger condensed water inlet adjusting valve (f6) in the 'first equipment (1').
More preferably, the 'adding of the second device (2)' based on the original design means that a bypass pipeline and a four-number regulating valve (f4) of a heat medium water inlet bypass of the tubular GGH flue gas heater are additionally arranged between an original water inlet and outlet main pipe of the tubular GGH flue gas heater, and the four-number regulating valve (f4) of the heat medium water inlet bypass of the tubular GGH flue gas heater in the 'second device (2)' is used for regulating to control the water inlet temperature of the flue gas cooler to be always kept at a target value, meanwhile, part of the heat medium water originally entering the flue gas heater directly flows back to the flue gas cooler and the water-water heat exchanger, and the part of redundant heat gives condensed water for recycling instead of meaningless heat to the flue gas of the chimney, so that the deep recycling of waste heat is realized.
More preferably, the addition of the third device (3) on the basis of the original design means that an atmospheric temperature measuring point t, an atmospheric relative humidity measuring point RH, an atmospheric wind speed measuring point WS and an atmospheric wind direction measuring point WS around the chimney are additionally arranged near the chimneyThe four instruments are connected into a control system through the signals, the reasonable chimney smoke temperature under the current atmospheric environment is automatically calculated through a formula, so that the temperature is used as a target value, and the target value is adjusted through a condensed water inlet automatic six-number adjusting valve (f6) of the tubular GGH water-water heat exchanger.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the intelligent detection method for preventing white smoke of the wet desulphurization chimney overcomes the limitations of blindly setting the chimney smoke temperature and manually setting the chimney smoke temperature parameters, has simple required program structure and easy realization, can greatly recover heat energy, save coal consumption, and can obviously improve the economy, reliability and environmental protection of the ultralow emission operation of a coal-fired unit.
The invention has the characteristics of simplicity, easy realization, obvious improvement on the economy and reliability of ultralow emission operation of the coal-fired unit, obvious effect on the economy and environment-friendly operation of the coal-fired unit and the like. The waste heat recovery automatic regulation and control device optimizes waste heat recovery automatic regulation and control, reduces a large amount of useless heat energy consumption, saves energy, reduces emission, and reduces environmental heat pollution at the same time. The invention has great popularization and reference significance for various wet desulphurization white smoke elimination coal-fired power generating units.
Drawings
FIG. 1 is a schematic diagram of a real-time deep recovery system for flue gas waste heat.
FIG. 2 shows the side flow rate, temperature and the like of the heat medium water and the condensed water of the water-water heat exchanger when the actual chimney smoke temperature is 75 ℃ after the method of the invention is used.
FIG. 3 shows the side flow rate, temperature and the like of the heat medium water and the condensed water of the water-water heat exchanger when the actual chimney smoke temperature is 70 ℃ after the method of the invention is used.
Wherein f1 is a regulating valve I; f2 is a second regulating valve; f3 is a third regulating valve; f4 is a four-way regulating valve; f5 is a five-way regulating valve; f6 is number six regulating valve;
101 is an air preheater A smoke pipe; 102 is an air preheater B smoke pipe; 103 is a flue gas cooler A; 104 is a flue gas cooler B; 105 is a water-water heat exchanger; 106 is a feeding pipe communicated with a No. 8 low feeding inlet mother pipe; 107 is a discharge pipe communicated with a No. 6 (which is not the same as No. 8) low-feeding inlet main pipe; 108 is a heating medium steam heater; 109 is a feeding pipe communicated with the auxiliary steam header; 110 is a flue gas heater; 111 is a chimney; 112 is a heating medium water pump; 113, electric precipitation; 114 is a boiler induced draft fan; 115 is a desulfurizing tower; 116, wet electric precipitation;
1 is a first device; 2 is a second device; 3 is a third device;
the parameters labeled in fig. 2 and 3 are for ease of understanding.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in connection with specific examples, which should not be construed as limiting the present patent.
The test methods or test methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials, unless otherwise indicated, are conventionally obtained commercially or prepared by conventional methods.
The invention relates to a detection method for chimney white smoke critical temperature required in real-time deep recovery based on wet desulphurization and flue gas waste heat, which is mainly used for providing an accurate and reasonable chimney smoke temperature when a wet desulphurization ultra-low emission coal-fired power generation unit adopts a reheating white smoke elimination technology or a condensation and reheating white smoke elimination technology, so that the chimney flue gas waste heat is greatly recovered in real time in a deep manner, the flue resistance is reduced, the dust removal and desulphurization efficiency is improved, and the thermal pollution is reduced.
The intelligent white smoke prevention detection method for the wet desulphurization chimney is an ultra-low emission coal-fired unit which is provided with a wet desulphurization heat exchanger and a tubular GGH heat exchanger to improve the chimney smoke temperature to prevent white smoke, or is provided with a wet desulphurization heat exchanger, a condensation heat exchanger and a chimney smoke temperature to improve the chimney smoke temperature to prevent white smoke, and needs a reasonable chimney smoke temperature to deeply recycle redundant smoke heat energy on the basis of ensuring that the chimney has no white smoke, and the reasonable chimney smoke temperature needs a technology of intelligent detection of the chimney white smoke prevention.
The aim of white smoke elimination and corrosion prevention of the chimney is fulfilled by circulating hot media water to a smoke heater at the inlet of the chimney through a hot media water pump after absorbing smoke heat by using hot media water arranged in an air preheater or a smoke cooler at an electric dust removal outlet and then reheating the smoke, but the aim of waste of a large amount of heat energy due to overhigh smoke temperature of the chimney is usually fulfilled.
The white smoke prevention by 'wet desulphurization, condensation and chimney smoke temperature increase' means that the wet desulphurization inevitably generates chimney white smoke, partial water vapor is condensed and separated out by using a condensing device, and the chimney smoke temperature is increased by using a rear tube type GGH to prevent the white smoke, so that the aims of white smoke elimination and corrosion prevention of the chimney are fulfilled. Compared with a method for preventing white smoke by using a wet desulphurization and tubular GGH heat exchanger to increase the smoke temperature of a chimney, the method has the advantages that the smoke temperature of the chimney is lower, and more heat energy can be recovered. But no reasonable chimney smoke temperature exists, and the conditions that the heat energy is wasted due to overhigh chimney smoke temperature or white smoke is generated due to overlow chimney smoke temperature also exist.
According to the intelligent detection technology for preventing white smoke of the chimney, signals of the atmospheric temperature, the atmospheric relative humidity, the atmospheric wind speed and the wind direction beside the chimney are introduced into a control system, a reasonable chimney smoke temperature is automatically obtained according to the atmospheric temperature, the atmospheric relative humidity, the atmospheric wind power and the wind direction and is fed back to a waste heat recovery system, the smoke temperature of the chimney is automatically adjusted in a program control mode, and all waste heat is recovered in real time and deeply. On the premise of ensuring that the chimney does not have white smoke and runs safely, the waste heat of the smoke is recovered to the maximum degree, and the heat island effect of the chimney is reduced.
The method is suitable for eliminating the white smoke by a wet desulphurization system, a tubular GGH cooling system and a reheating temperature-raising system, or a coal-fired boiler with the requirements of eliminating the white smoke by the wet desulphurization system, the condensation system and the reheating temperature-raising system, and the chimney flue is required to be provided with an online temperature instrument, otherwise, the method cannot be realized.
The technical features (the components/elements of the invention) of the wet desulfurization, tubular GGH cooling and reheating system for white smoke abatement are all obtained from conventional commercial sources or prepared by conventional methods, and the specific structure, the operation principle, and the control mode and the spatial arrangement mode which may be involved are all conventional choices in the field, and should not be regarded as the innovation point of the invention, and it is understood by those skilled in the art that the invention patent is not further detailed.
Example 1:
an intelligent detection method for preventing white smoke of a wet desulphurization chimney is characterized in that through test and statistical data analysis, the relation between atmospheric temperature, atmospheric relative humidity, atmospheric wind power, wind direction and chimney white smoke critical smoke temperature is determined, so that a correlation formula is found and is led into a control system; taking the atmospheric temperature, the atmospheric relative humidity, the atmospheric wind power and the wind direction signal as variables, introducing a correlation formula and automatically calculating the current chimney white smoke critical smoke temperature in real time; giving the 'chimney white smoke critical smoke temperature' to a chimney smoke temperature target set value so as to realize automatic adjustment of the recovery capacity of the waste heat recovery system according to the chimney white smoke critical smoke temperature; the method comprises the following specific steps:
s1, acquiring 4 signals (or called data information) of atmospheric temperature, atmospheric relative humidity, atmospheric wind power and wind direction in real time by additionally arranging a detection instrument, and transmitting the signals to a control system (such as a computer or a server);
s2, the control system takes 4 signals of atmospheric temperature, atmospheric relative humidity, atmospheric wind power and wind direction as 4 variables and introduces the following calculation formula of 'actual chimney white smoke critical smoke temperature', and the actual chimney white smoke critical smoke temperature is calculated and obtained:
in the formula, T80: the upper limit value of the smoke temperature of the chimney is 80 ℃;
T63: the smoke temperature limit value of the chimney is 63 ℃;
t40: the upper limit of the atmospheric temperature is 40 ℃;
t10: the lower limit of the atmospheric temperature is 10 ℃;
ε1: an atmospheric relative humidity correction factor;
ε2: a wind power correction factor;
ε3: a wind direction correction factor;
and S3, feeding the actual chimney white smoke critical temperature obtained by calculation back to a waste heat recovery system (a smoke waste heat real-time deep recovery system) by the control system, and regulating and controlling the smoke temperature in the chimney in real time according to the actual chimney white smoke critical temperature to realize the maximization of the recovered waste heat and the minimization of thermal pollution.
Preferably, the atmospheric relative humidity correction coefficient ∈ 1 is calculated by using the following formula:
in the formula, RHPractice ofIn the effective range: RH of 80-80 ≤Practice ofLess than or equal to 100, when the content is less than 80, the calculation is carried out according to 80;
δ 1: setting a correction maximum value within a set range of 0.1-0.3 when the relative humidity of the atmosphere is 100%;
100 refers to the upper limit of relative humidity of the atmosphere 100%, and 80 refers to the lower limit of the relative humidity influence of the atmosphere 80%.
Preferably, the δ 1: the maximum correction value set for the atmospheric relative humidity of 100% was set to 0.2.
Preferably, the wind power correction coefficient ∈ 2 is calculated by using the following formula:
WS valid Range: RH is not less than 5Practice ofLess than or equal to 15, and when the content is less than 5, calculating according to 5;
δ2: the set correction maximum value is 0.1-0.3 when the wind power is 15 m/s;
15 means the upper wind limit of 15m/s, 5 means the lower wind limit of 5 m/s.
Preferably, said delta2: the set correction maximum value is set to be 0.2 when the wind power is 15 m/s;
preferably, the wind direction correction coefficient ∈ 3 is calculated by using the following formula:
ε3=1.2
ε3=1.1
ε3=1.0
preferably, the waste heat recovery system (flue gas waste heat real-time deep recovery system) is additionally provided with a first device 1 on the basis of the original design, namely a tubular GGH flue gas waste heat recovery water-water heat exchanger, a pipeline and an adjusting valve thereof; in the original designA second device 2, namely a tubular GGH flue gas heater heating medium water inlet bypass electric regulating valve is additionally arranged on the basis; on the basis of the original design, a third device 3 is additionally arranged, namely an atmospheric temperature measuring point t, an atmospheric relative humidity measuring point RH, an atmospheric wind speed measuring point WS and an atmospheric wind direction measuring point on the periphery of the chimney
Preferably, the ' adding of the first equipment 1 ' on the basis of the original design ' means that the waste heat in the heat medium water is recycled to the steam turbine condensed water by connecting a tubular GGH water-water heat exchanger in parallel or in series on the original tubular GGH heat medium water pipeline and adjusting through the automatic condensed water inlet adjusting valve 6 of the tubular GGH water-water heat exchanger in the ' first equipment 1 '.
Preferably, the 'adding of the second equipment 2 on the basis of the original design' means that a bypass pipeline and a tubular GGH flue gas heater hot medium water inlet bypass electric regulating valve are additionally arranged between an original tubular GGH flue gas heater water inlet and outlet main pipe, and are regulated by a tubular GGH flue gas heater hot medium water inlet bypass electric regulating valve 4 in the 'second equipment 2' to control the water inlet temperature of a flue gas cooler to be always kept at a target value, meanwhile, part of hot medium water originally entering the flue gas heater directly flows back to the flue gas cooler and a water-water heat exchanger, and the part of redundant heat gives condensed water for recycling instead of meaningless heat for flue gas of a chimney, so that the deep recycling of waste heat is realized.
Preferably, the "adding of the third device 3 on the basis of the original design" means that an atmospheric temperature measuring point t, an atmospheric relative humidity measuring point RH, an atmospheric wind speed measuring point WS and an atmospheric wind direction measuring point on the periphery of the chimney are added near the chimneyThe four instruments are connected into a control system through the signals, and the reasonable chimney smoke temperature under the current atmospheric environment is automatically calculated through a formula, so that the temperature is used as a target value and is adjusted through an automatic adjusting valve 6 for adjusting the condensed water inlet of the tubular GGH water-water heat exchanger.
Example 2:
as shown in fig. 1, a first device 1 is added on the basis of the original design: namely a tubular GGH flue gas waste heat recovery water-water heat exchanger, a pipeline thereof and a No. six regulating valve f 6; add second equipment 2 on original design basis: namely a fourth regulating valve f4 (electric regulating valve) of a heat medium water inlet bypass of the tubular GGH flue gas heater; add third equipment 3 on original design basis: namely an atmospheric temperature measuring point t, an atmospheric relative humidity measuring point RH, an atmospheric wind speed measuring point WS and an atmospheric wind direction measuring point on the periphery of the chimney
The invention provides a method for recovering waste heat in heat medium water by adding a first device 1 on the basis of the original design, which means that the waste heat in the heat medium water is recovered to condensed water of a steam turbine by connecting a tubular GGH water-water heat exchanger in parallel or in series on the original tubular GGH heat medium water pipeline and adjusting through a six-number-of-tubular GGH water-water heat exchanger condensed water inlet adjusting valve f6 in the first device 1.
The invention relates to a method for adding a second device 2 on the basis of the original design, which is characterized in that a bypass pipeline and a four-number regulating valve f4 (electric regulating valve) of a heat medium water inlet bypass of a tubular GGH flue gas heater are additionally arranged between an inlet water outlet main pipe and an outlet water main pipe of the original tubular GGH flue gas heater, and the four-number regulating valve f4 (electric regulating valve) of the heat medium water inlet bypass of the tubular GGH flue gas heater in the second device 2 is used for regulating to control the inlet water temperature of the flue gas cooler to be always kept at a target value (the inlet water temperature of the flue gas cooler needs to be kept at 70 ℃ because of the corrosion prevention of the flue gas cooler), meanwhile, part of the heat medium water originally entering the flue gas heater directly flows back to the flue gas cooler and a water-water heat exchanger, and the redundant heat is used for recovering condensed water instead of unnecessary heat to.
The invention discloses that 'adding a third device 3 on the basis of the original design' means that an atmospheric temperature measuring point t, an atmospheric relative humidity measuring point RH, an atmospheric wind speed measuring point WS and an atmospheric wind direction measuring point on the periphery of a chimney are added near the chimneyThe four instruments are connected into the control system through the signals, the reasonable chimney smoke temperature under the current atmospheric environment is automatically calculated through a formula, and the temperature is used as a target value and is adjusted through a six-number adjusting valve f6 for adjusting the condensed water inlet of the tubular GGH water-water heat exchanger.
As shown in fig. 1, it is a simplified diagram of a real-time deep recovery system for flue gas waste heat. The figure is shown to be provided with a tubular GGH flue gas cooler, an electric dust remover, a draught fan, a desulfurization absorption tower, wet electricity, a tubular GGH flue gas heater and a chimney according to the flue gas flow direction; according to the water flow direction of the tubular GGH heat medium, the device is provided with a tubular GGH flue gas cooler, a steam heater, a water-water heat exchanger, a flue gas heater and a bypass thereof, and a heat medium water pump.
After the flue gas waste heat is deeply recovered, the estimated chimney smoke temperature can be reduced by 10-15 ℃ in summer or under high load, and the estimated chimney smoke temperature can be reduced by 5-10 ℃ again under winter or under deep peak regulation and low load.
After the deep recovery of the flue gas waste heat is implemented, the main objects and control logic required to be controlled are changed into:
control of T1:
the automatic first regulating valve f1 and the second regulating valve f2 realize that: when the device is put into automatic operation, the first regulating valve f1 and the second regulating valve f2 are automatically adjusted to enable the smoke temperature at the outlet of the smoke cooler to be at a target value.
Control of T2:
the opening of the fourth regulating valve f4 is automatically regulated to realize that: when put into automation, the four-regulating valve f4 was automatically adjusted so that the flue gas cooler inlet water temperature was at 70 ℃. If the temperature of the inlet water of the flue gas cooler is higher, the opening degrees of a first regulating valve f1 and a second regulating valve f2 of a water inlet bypass of the flue gas heater are reduced, so that more heat of the heat medium water is released to the flue gas flowing through the flue gas heater; the inlet water temperature of the flue gas cooler is lower than 70 ℃, and the opening degree of a fourth regulating valve f4 (water inlet regulating valve) of the flue gas heater is increased so as to reduce the heat of the heat medium water from being released to the flue gas flowing through the flue gas heater.
Control of Q1:
the opening degree of the automatic third regulating valve f3 is realized: when the automatic turn-on is performed, the automatic third regulating valve f3 is set to make the total circulating heat medium flow of the tubular GGH at the target value.
Control of T3:
the control is relatively complex, and after a proper temperature value is set, the temperature value needs to be adjusted through cooperation of a fifth adjusting valve f5 and a sixth adjusting valve f 6. The logic is as follows: (1) the fifth regulating valve f5 also is a heating medium water heating steam regulating valve which only tracks the temperature of the smoke at the outlet of the smoke heater at the SP value. (2) When the instruction of the heating medium water heating steam regulating valve is more than 0.5% (can be set), the fifth regulating valve f5 is preferred, namely the opening degree of the condensed water inlet regulating valve of the tubular GGH water heat exchanger, and when the instruction of the heating medium water heating steam regulating valve is less than 0.5% (can be set), the condensed water inlet regulating valve which is thrown into the tubular GGH water heat exchanger is automatic, and the regulating object is the outlet smoke temperature of the smoke heater (namely the smoke temperature of a chimney).
And (4) correcting the chimney white smoke critical smoke temperature by using a formula, namely the finally required actual chimney white smoke critical smoke temperature.
The calculation method comprises the following steps:
(1) and establishing a main calculation formula of the critical smoke temperature of the white smoke of the chimney.
The atmospheric temperature and the critical smoke temperature of the white smoke of the chimney basically have a linear relationship, and therefore, the relationship can be deduced by the following steps:
this is the formula of note calculation. In the formula:
T80: the upper limit value of the chimney smoke temperature is 80 ℃ (when the temperature is more than 80 ℃, the chimney smoke can emit white smoke when the temperature is raised again in cold weather in winter, and the auxiliary heating quantity of steam is very large, which has no meaning)
T63: the smoke temperature of the chimney is limited to 63 ℃ (below 63 ℃, the unit is high in load and atmospheric temperature, the chimney still emits white smoke, and the unit does not have significance, but the unit adopting the condensation and temperature rise type white smoke elimination technology can continuously adjust the temperature downwards for testing)
t40: upper limit of atmospheric temperature, 40 ℃ (maximum atmospheric temperature 40 ℃, no significance already in excess of 40 ℃)
t10: the lower limit of the atmospheric temperature is 10 ℃ (when the temperature is below 10 ℃, the smoke temperature of a chimney is not suitable to be adjusted downwards, except the white smoke eliminating technology adopting a condensation and temperature rise mode)
For example: when the atmospheric temperature is 15 ℃, the critical smoke temperature of the white smoke of the chimney is 0.566 multiplied by 5+63 ═ 65.8 ℃ by the formula.
(2) Considering the influence of atmospheric relative humidity, wind power and wind direction, the above calculation formula of "chimney white smoke critical smoke temperature" (i.e. main calculation formula) needs to be corrected.
The higher the relative humidity of the atmosphere is, the higher the critical smoke temperature setting of the actual chimney white smoke needs to be than the critical smoke temperature of the theoretical chimney white smoke, and the requirement of white smoke elimination can be met. The correction coefficient of the atmospheric relative humidity to the theoretical chimney white smoke critical smoke temperature is epsilon1The correction factor is effective in monitoring the relative humidity of the atmosphere within the range of 80-100%.
The calculation method comprises the following steps:
RHpractice ofEffective range: RH of 80-80 ≤Practice ofLess than or equal to 100, when less than 80, calculating to obtain epsilon according to 801=1。
δ 1: the maximum value of the correction to be set when the atmospheric relative humidity is 100% can be set by opening the operator, and is generally set to 0.2.
Wherein 100 refers to the upper limit of the relative humidity of the atmosphere being 100%, 80 refers to the lower limit of the influence of the relative humidity of the atmosphere being 80%, and the upper limit and the lower limit can be generally modified according to the geographical situation, wherein the lower limit of the relative humidity of the atmosphere being 80% is considered to not influence the critical smoke temperature of the white smoke of the chimney according to the test situation, so the RH is RHPractice ofBelow 80% it is calculated as 80.
Wind force influence: the higher the wind power is, the higher the critical smoke temperature of the white smoke of the actual chimney needs to be than the critical smoke temperature of the white smoke of the theoretical chimney, so that the white smoke can be eliminated. The correction coefficient of the wind power to the critical smoke temperature of the white smoke of the theoretical chimney is epsilon2When the monitored wind power is above 5.0m/sIs effective.
The calculation method comprises the following steps:
WS valid Range: RH is not less than 5Practice ofLess than or equal to 15, when less than 5, calculating according to 5 to obtain epsilon2=1。
δ2: the maximum value of the correction to be set at 15m/s is set to be open to the operator, and is typically set to 0.2.
In the formula, 15 refers to the upper wind power limit of 15m/s, 5 refers to the lower wind power limit of 5m/s, and the modification can be generally carried out according to the wind power influence quantity, wherein the wind power below 5m/s is considered to not influence the white smoke critical smoke temperature of the chimney according to the test situation, so the WS is calculated according to 5m/s when the WS is lower than 5 m/s.
Wind direction influence: when the northern wind, the northwest wind and the west wind are monitored, the actual chimney white smoke critical smoke temperature needs to be higher than the theoretical chimney white smoke critical smoke temperature, so that the white smoke can be eliminated. The correction coefficient of the wind direction to the critical smoke temperature of the white smoke of the theoretical chimney is epsilon3The correction coefficient is effective when the northern wind, northwest wind and west wind are monitored.
The calculation method comprises the following steps: epsilon3=1.2ε3=1.1ε3=1.0
ε3: different wind directions are set as different correction coefficients, and are generally directly given by a wind direction meter.
In conclusion, the actual chimney white smoke critical smoke temperature calculation formula is as follows:
wherein, T63、t10、ε1、ε2、ε3The device can be used for carrying out tests and calibration according to different desulfurization smoke speeds, different water contents of the smoke and different geographic positions of the machine set, so as to improve the accuracy and the adaptability. The lower the water content of the flue gas of a common chimney (for example, condensation dehumidification is adopted), the T63A lower value trial run can be selected to obtain a reasonable value; factor delta1Influence of epsilon1In north, delta can be selected1=0.3;δ2Influence of epsilon2In north, delta can be selected2=0.3;ε3In the north direction, epsilon can be selected3=1.2。
As shown in figures 2 and 3, after the method disclosed by the invention is used, the smoke temperature of the chimney of the 330MW unit is reduced to 75 ℃, 70 ℃ and the like, and the white smoke and water-water heat exchanger at the outlet of the chimney works.
The actual results and the graphical parameters of the operation of the 330MW unit can be calculated to obtain the heat energy recovered from the flue gas per hour:
Qrecovering=(hCoagulation 2-hCoagulation 1) X 63000 (377kJ/kg-135kJ/kg) x 63000 15246000kJ 3642270kcal 520kg standard coal/h.
Meanwhile, after the smoke temperature is reduced, the amount of steam which needs auxiliary heating originally is greatly reduced, and the steam saving per hour is reduced:
Qsteam heating=(hSteam generator-hSaturated water) X 3000 (2800kJ/kg-419kJ/kg) x 3000 (7143000 kJ) 1706462 kJ (243 kg standard coal/h).
By referring to the equivalent enthalpy drop method calculation of Shanghai Oriental boiler plants, the smoke temperature is reduced by 15 ℃ (the smoke enthalpy is used for heating part condensed water, and the steam is extruded and then continues to work in a steam turbine to improve the efficiency), so that the coal consumption can be saved by about 0.52g standard coal/kWh; and the steam saved by stopping heating can save about 0.6g of standard coal/kWh in coal consumption.
The heat exchange coefficient of the flue gas cooler is improved after the water temperature is reduced, the flue gas temperature at the outlet of the flue gas cooler can be reduced, so that the flue resistance is reduced, the current of the induced draft fan is reduced, the electric dust removal efficiency and the desulfurization efficiency are improved, and the economic benefits obtained by saving station power, saving water and the like are not listed.
The technology also has great effect on reducing the smoke exhaust heat pollution of the chimney.
The technology can be widely applied to a coal-fired generator set with 'reheating white smoke elimination and ultra-low emission', and for a generator set adopting a 'condensation + reheating white smoke elimination' technical route, the corresponding chimney white smoke critical temperature can also be obtained through tests, so that the technology can also be adopted. Therefore, the technology has wide deducability on each reheating white smoke eliminating coal-fired unit.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.

Claims (10)

1. The method is characterized in that the method determines the relationship between the atmospheric temperature, the atmospheric relative humidity, the atmospheric wind power, the wind direction and the chimney white smoke critical temperature through test and statistical data analysis, thereby finding out a correlation formula and importing the formula into a control system; taking the atmospheric temperature, the atmospheric relative humidity, the atmospheric wind power and the wind direction signal as variables, introducing a correlation formula and automatically calculating the current chimney white smoke critical smoke temperature in real time; giving the 'chimney white smoke critical smoke temperature' to a chimney smoke temperature target set value so as to realize automatic adjustment of the recovery capacity of the waste heat recovery system according to the chimney white smoke critical smoke temperature; the method comprises the following specific steps:
s1, collecting 4 signals of atmospheric temperature, atmospheric relative humidity, atmospheric wind power and wind direction in real time by additionally arranging a detection instrument, and transmitting the signals to a control system;
s2, the control system takes 4 signals of atmospheric temperature, atmospheric relative humidity, atmospheric wind power and wind direction as 4 variables and introduces the following calculation formula of 'actual chimney white smoke critical smoke temperature', and the actual chimney white smoke critical smoke temperature is calculated and obtained:
in the formula, T80: the upper limit value of the smoke temperature of the chimney is 80 ℃;
T63: the smoke temperature limit value of the chimney is 63 ℃;
t40: the upper limit of the atmospheric temperature is 40 ℃;
t10: the lower limit of the atmospheric temperature is 10 ℃;
ε1: an atmospheric relative humidity correction factor;
ε2: a wind power correction factor;
ε3: a wind direction correction factor;
and S3, feeding the actual chimney white smoke critical temperature obtained by calculation back to the waste heat recovery system by the control system, and regulating and controlling the smoke temperature in the chimney in real time according to the actual chimney white smoke critical temperature to realize the maximization of recovered waste heat and the minimization of thermal pollution.
2. The intelligent detection method for preventing white smoke of wet desulphurization chimney according to claim 1, characterized in that the correction coefficient epsilon of relative humidity of atmosphere1The formula is as follows:
in the formula, RHPractice ofIn the effective range: RH of 80-80 ≤Practice ofLess than or equal to 100, when the content is less than 80, the calculation is carried out according to 80;
δ 1: setting a correction maximum value within a set range of 0.1-0.3 when the relative humidity of the atmosphere is 100%;
100 refers to the upper limit of relative humidity of the atmosphere 100%, and 80 refers to the lower limit of the relative humidity influence of the atmosphere 80%.
3. The intelligent detection method for white smoke prevention of the wet desulphurization chimney as recited in claim 2, wherein the delta 1: the maximum correction value set for the atmospheric relative humidity of 100% was set to 0.2.
4. The intelligent white smoke prevention detection method for the wet desulphurization chimney according to claim 1, wherein the wind power correction coefficient epsilon2The formula is as follows:
WS valid Range: RH is not less than 5Practice ofLess than or equal to 15, and when the content is less than 5, calculating according to 5;
δ2: the set correction maximum value is 0.1-0.3 when the wind power is 15 m/s;
15 means the upper wind limit of 15m/s, 5 means the lower wind limit of 5 m/s.
5. The intelligent detection method for white smoke prevention of wet desulphurization chimney according to claim 4, wherein δ is the same as δ2: the set correction maximum value is set to be 0.2 when the wind power is 15 m/s;
6. the intelligent detection method for preventing white smoke of wet desulphurization chimney according to claim 1, wherein the wind direction correction coefficient epsilon3The formula is as follows:
when in useε3=1.2;
When in useε3=1.1;
When in use
7. The intelligent detection method for preventing the white smoke of the wet desulphurization chimney according to claim 1, wherein the waste heat recovery system is additionally provided with a first device (1) based on the original design, namely a tubular GGH flue gas waste heat recovery water-water heat exchanger, a pipeline thereof and a No. six regulating valve (f 6); a second device (2), namely a fourth regulating valve (f4) of a heat medium water inlet bypass of a tubular GGH flue gas heater, is additionally arranged on the basis of the original design; on the basis of the original design, a third device (3) is additionally arranged, namely an atmospheric temperature measuring point t, an atmospheric relative humidity measuring point RH, an atmospheric wind speed measuring point WS and an atmospheric wind direction measuring point on the periphery of the chimney
8. The intelligent detection method for preventing the white smoke of the wet desulphurization chimney as recited in claim 7, wherein the "adding the first equipment (1)" based on the original design means that the waste heat in the heat medium water is recovered to the steam turbine condensed water by connecting a tubular GGH water heat exchanger in parallel or in series on the original tubular GGH heat medium water pipeline and adjusting through a six-number-six adjusting valve (f6) for the condensed water of the tubular GGH water heat exchanger in the "first equipment (1)".
9. The intelligent white smoke prevention detection method for the wet desulphurization chimney as recited in claim 7, wherein the "adding of the second device (2)" on the basis of the original design means that a bypass pipeline and a four-way regulating valve (f4) of a tubular GGH flue gas heater hot medium water inlet bypass are additionally arranged between an original tubular GGH flue gas heater inlet and outlet water main pipe, and the hot medium water inlet temperature of the tubular GGH flue gas heater hot medium water inlet bypass in the "second device (2)" is regulated by the four-way regulating valve (f4) to control the flue gas cooler water inlet temperature to be always kept at a target value, meanwhile, part of hot medium water originally entering the flue gas heater directly flows back to the flue gas cooler and the water-water heat exchanger, and the excessive heat gives condensed water recovery instead of unnecessary heat to the chimney flue gas, thereby realizing deep waste heat recovery.
10. The intelligent white smoke detection method for the wet desulphurization chimney as recited in claim 7, wherein the addition of the third device (3) on the basis of the original design means that the atmospheric temperature measuring point t, the atmospheric relative humidity measuring point RH, the atmospheric wind speed measuring point WS and the atmospheric wind direction measuring point WS around the chimney are additionally arranged near the chimneyThe four instruments are connected into a control system through the signals, the reasonable chimney smoke temperature under the current atmospheric environment is automatically calculated through a formula, so that the temperature is used as a target value, and the target value is adjusted through a condensed water inlet automatic six-number adjusting valve (f6) of the tubular GGH water-water heat exchanger.
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