CN107218592A - A kind of fume afterheat complex control system and its application method - Google Patents
A kind of fume afterheat complex control system and its application method Download PDFInfo
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- CN107218592A CN107218592A CN201710434910.4A CN201710434910A CN107218592A CN 107218592 A CN107218592 A CN 107218592A CN 201710434910 A CN201710434910 A CN 201710434910A CN 107218592 A CN107218592 A CN 107218592A
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- 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
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/36—Water and air preheating systems
- F22D1/38—Constructional features of water and air preheating systems
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Abstract
The present invention relates to a kind of fume afterheat complex control system, including flue gas heat-exchange unit, steam air heater, booster pump, circulating pump, heating agent water system, valve member, automatic control system component, flue gas heat-exchange unit is arranged on the flue between preheater outlet and deduster or on the flue between house outlet and desulfurization entrance；Steam air heater is connected with preheater by connecting line；Heating agent water system is connected with steam air heater, flue gas heat-exchange unit by connecting line respectively；Circulating pump is arranged on the connecting line of heating agent water system and steam air heater；Booster pump is arranged on the connecting line of heating agent water system and flue gas heat-exchange unit；Valve controlling component includes gas flow regulating valve, liquid flow regulating valve.The control system has easy for operation, it is easy to control, and produces, runs and maintenance cost is low; reliable, automaticity is higher, effectively reduces labor strength; off-gas recovery utilization ratio is improved, environment is effectively protected, meets the requirement of energy-saving and emission-reduction.
Description
Technical field
The present invention relates to power plant stack gas Heat Treatment technical field, more particularly to a kind of fume afterheat complex control system
And its application method, it mainly utilizes fume afterheat heating condensate water, hot net water, low-temperature flue gas, cooperates with the heat as steam air heater
The problem of First air or Secondary Air or primary and secondary air of source heating preheater import are to solve preheater low-temperature corrosion and stifled ash.
Background technology
By the end of the year 2016, wherein national 16.5 hundred million kilowatts of total capacity of generating equipment installation, 9.4 hundred million kilowatts of coal electricity, accounting
57%, coal electricity is still the main force of generating within following considerable time.Flue gas loss is most important in boiler operatiopn
One heat loss, the exhaust gas temperature of country's coal-fired power station boiler design is universal higher at present, the exhaust gas temperature reduction of China
Space it is very big, can debase the standard coal consumption accordingly.Boiler exhaust gas is potentiality very big waste heat source, it is possible to use Hen Duoxin
Technology and equipment reduce boiler exhaust gas temperature.As country and place are put into effect in succession《Coal electricity energy-saving and emission-reduction upgrading and transformation
Action plan (2014-the year two thousand twenty)》, it is desirable to new-built unit gross coal consumption rate is not more than 300g/kWh, and active service Transformation of Unit generates electricity
Coal consumption is not more than 310g/kWh, is to be unable to reach this if substantial amounts of subcritical active service unit is without depth reducing energy consumption
Individual gross coal consumption rate requirement.
Current coal-fired power plant is after SCR denitration transformation operation a period of time, rotary regenerative air heater generally existing fume side
Resistance quickly raises problem, sometimes more than 2kpa, or even can arrive 3kpa or so.Its main cause is boiler increase SCR denitration
After system, generally existing amount of ammonia slip is excessive, and Flow Field Distribution is uneven, SO2To SO3Conversion ratio is too high, and most of power plant are long-term
In underrun state, air preheater entrance flue gas temperature is generally reduced to 330 DEG C or so, and exhaust gas temperature is greatly lowered,
Low temp area winter running on the lower load can even be less than 90 DEG C, and this allows for the hydrogen sulfate ammonia by initial design load calculating
(ABS) block corrosion region to move up, in the region for above moving on to intermediate layer bottom about 300mm, cause local flue gas flow rate to raise, flue gas
Channel blockage, serious conditions even can block whole intermediate layer.And then, the serious corrosion of air preheater and stifled ash add and send air inducing
Machine resistance, reduces the exchange capability of heat of preheater, causes exhaust gas temperature to raise, boiler efficiency reduction, influences unit safety operation.
Asking for the stifled grey problem of corrosion occurred in universal higher and preheater running is lost for current boiler exhaust gas
Topic, although heat exchanger can also be utilized by installing fume afterheat additional in boiler back end ductwork in the prior art, reaches that depth is reclaimed
Fume afterheat, raising unit efficiency, optimization flue-gas temperature, reduction pollutant emission, the purpose for saving desulfurization water consume；It can also lead to
The temperature for improving preheater import cold wind is crossed, to properly increase preheater cold end wall temperature, effectively control hydrogen sulfate ammonia condenses interval,
Solve the serious low-temperature corrosion of generally existing and stifled grey problem in current preheater running.But above-mentioned means are existed
Production cost, operating cost, maintenance cost are higher, complex operation, and treatment effect is difficult to produce a desired effect etc. and lacked sometimes
Fall into, thus propose a kind of flue gas waste heat recovery complex control system that can overcome drawbacks described above have important practical significance and
Research Significance.
The content of the invention
For being deposited in the prior art to there are the technological means such as clog in off-gas recovery utilization, preheater running
Defect, it is an object of the invention to：A kind of fume afterheat complex control system and its application method are provided, it is mainly utilized
Coal unit fume afterheat heating condensate water, hot net water, low-temperature flue gas, cooperate with and heat preheater import as the thermal source of steam air heater
The problem of First air or Secondary Air or primary and secondary air are to solve preheater low-temperature corrosion and stifled ash.Have using the control system
It is easy for operation, it is easy to control, produce, run and maintenance cost is low, reliable, automaticity is higher, effectively reduction
Labor strength, improves off-gas recovery utilization ratio, effectively protects environment, meets the requirement of energy-saving and emission-reduction.
In order to achieve the above object, the present invention is realized using following technological means：
A kind of fume afterheat complex control system, the control system includes flue gas heat-exchange unit, steam air heater, booster pump, circulation
Pump, heating agent water system, valve member, automatic control system component, the flue gas heat-exchange unit are arranged in preheater outlet and dedusting
On flue on flue between device or between house outlet and desulfurization entrance；The steam air heater passes through connecting tube with preheater
Road is connected；The heating agent water system is connected with steam air heater, flue gas heat-exchange unit by connecting line respectively；The circulating pump is set
Put on the connecting line of heating agent water system and steam air heater；The booster pump is arranged on the company of heating agent water system and flue gas heat-exchange unit
Take on road；Heat medium water in heating agent water system enters flue gas heat-exchange unit after booster pump is pressurized, then passes through flue gas heat-exchange unit
Enter steam air heater by circulating pump after heating, First air and/or Secondary Air enter preheater after steam air heater is heated；By warm
The heat medium water of wind device is returned in flue gas heat-exchange unit by connecting line to be recycled；The automatic control system is changed with flue gas respectively
Hot device, steam air heater, booster pump, circulating pump, heating agent water system, valve member control connection；The Valve controlling component includes stream
Adjustable valve；The automatic control system component includes：Controller, temperature sensor；The temperature sensor and controller number
It is believed that number connection；The temperature sensor, which is separately positioned on flue gas heat-exchange unit import and export flue, to be used to measure import and export cigarette
Temperature, temperature sensor, which is additionally arranged on flue gas heat-exchange unit low-temperature heat exchange pipe, to be used to measure heat exchange tube wall temperature and is arranged on warm wind
On the import and export pipeline of device；The liquid flow regulating valve is arranged on connecting line, the heat medium water of heating agent water system and warm-air drier
It is used to adjust the flow and heat medium water rate of water make-up for entering steam air heater heat medium water on the connecting line of system and flue gas heat-exchange unit；Control
Temperature signal control booster pump, circulating pump and the state of flow control valve and regulation that device is detected according to each temperature sensor are entered
Enter the flow and heat medium water rate of water make-up of steam air heater heat medium water；After overregulating steam air heater outlet First air Secondary Air or one,
The temperature control of Secondary Air is at 50~70 DEG C.
As the further optimization of such scheme, it is all provided with the import of the flue gas heat-exchange unit or import and export flue position
There is deflector.
As the further optimization of such scheme, the heat exchanger tube of the windward side of the flue gas heat-exchange unit be provided with wearing-resistant tile,
Any or its combination in abrasionproof false tube, light pipe built-up welding, the brilliant enamel coating of titanium.
As the further optimization of such scheme, the soot blower form of the flue gas heat-exchange unit uses compound soot-blowing mode,
Add steam soot blowing mode including sonic soot blowing plus impulse soot blowing, sonic soot blowing.
As the further optimization of such scheme, the heat exchange element of the flue gas heat-exchange unit uses light pipe, extended surface tube, fin
Pipe, membrane tube or spiral grooved tube, material use metal, nonmetallic or composite；In flue gas heat-exchange unit low-temperature heat exchange pipe
On wall temperature measurement point is installed, by monitor wall temperature adjust operational factor, it is to avoid occur low-temperature corrosion；The heat exchange member of the steam air heater
Part uses light pipe, extended surface tube, gilled tube, membrane tube or spiral grooved tube, material selection metal, nonmetallic or composite.
As the further optimization of such scheme, the steam air heater includes main steam air heater and/or secondary steam air heater, wherein main warm
Wind device is arranged on the main pipeline of First air and/or secondary air inlet, and temperature survey is provided with the import and export pipeline of steam air heater
Point, the temperature of the heating agent water of steam air heater, steam air heater outlet First air or Secondary Air or primary and secondary air is entered according to temperature adjustment
Control is at 50~70 DEG C；Secondary steam air heater, which is arranged on the branch pipe(tube) of First air and/or secondary air inlet, to be used to aid in heating once
Wind and/or Secondary Air；Wherein secondary steam air heater is brought up to the temperature of First air and/or Secondary Air as thermal source using auxiliary steam
0~10 DEG C.
As the further optimization of such scheme, the flue gas stream after flue gas heat-exchange unit heat exchange enter deduster or
Desulfurizing tower.
A kind of above-mentioned application method of fume afterheat complex control system of the present invention, comprises the following steps：
1) flue gas heat-exchange unit, the preparation such as water, emptying on steam air heater are carried out before starting, it is ensured that each part can be transported normally
OK；
2) preheater, steam air heater, flue gas heat-exchange unit, heat medium water water charging system, booster pump, circulation pumping unit, control are opened
The flue gas heat-exchange unit that device is detected according to the temperature sensor of each relevant position exports the heat medium water after cigarette temperature, heat exchanger heating
The temperature of temperature, steam air heater import and export First air and/or Secondary Air, control booster pump and circulating pump, the shape of flow control valve
State, regulation enters the flow and heat medium water rate of water make-up of steam air heater heat medium water, the steam air heater outlet First air or two after overregulating
The temperature control of secondary wind or primary and secondary air is at 50~70 DEG C.
It is used as the further optimization of such scheme, the step 2) in, when fume afterheat complex control system is transported in the winter time
During row, the First air and/or secondary air temperature of steam air heater import spend it is low, the secondary steam air heater of controller control by the use of auxiliary steam as
First air and/or Secondary Air temperature are brought up to 0~10 DEG C by thermal source.
Had the advantages that using the fume afterheat complex control system and its application method of the present invention：
Reasonable in design, it is simple to operate, it rationally make use of fume afterheat, it is not necessary to consume other thermals source, power consumption is few, accounts for
Ground is small, and operating cost is low, solves the serious of the preheater low-temperature corrosion of generally existing and stifled ash after current coal unit increase SCR
Problem, extends the service life of preheater heat transfer element, improves the efficiency of dust collection of electric cleaner, solves underload hydrogen sulfate ammonia
Break bounds problem is condensed, the rate of water make-up of desulphurization system is reduced, boiler operating efficiency is improved by reducing exhaust gas temperature, reduces coal consumption.
Brief description of the drawings
Accompanying drawing 1 is the fundamental diagram of fume afterheat complex control system of the present invention.
Embodiment
1 pair of fume afterheat complex control system and its application method of the present invention are further described with reference to the accompanying drawings.
A kind of fume afterheat complex control system, the control system includes flue gas heat-exchange unit 1, steam air heater 2, booster pump 3, followed
Ring pump 4, heating agent water system 5, valve member, automatic control system component, the flue gas heat-exchange unit be arranged in preheater outlet 6 with
On flue on flue between deduster or between house outlet and desulfurization entrance；The steam air heater passes through even with preheater
Adapter road is connected；The heating agent water system is connected with steam air heater, flue gas heat-exchange unit by connecting line respectively；The circulation
Pump is arranged on the connecting line of heating agent water system and steam air heater；The booster pump is arranged on heating agent water system and flue gas heat-exchange unit
Connecting line on；Heat medium water in heating agent water system enters flue gas heat-exchange unit after booster pump is pressurized, then is changed by flue gas
Enter steam air heater by circulating pump after hot device heating, First air and/or Secondary Air enter preheater after steam air heater is heated；Through
The heat medium water for crossing steam air heater is returned in flue gas heat-exchange unit by connecting line and recycled；The automatic control system respectively with cigarette
Gas heat exchanger, steam air heater, booster pump, circulating pump, heating agent water system, valve member control connection；The Valve controlling component bag
Include flow control valve；The automatic control system component includes：Controller, temperature sensor；The temperature sensor and control
Device data-signal is connected；The temperature sensor, which is separately positioned on flue gas heat-exchange unit import and export flue, to be used to measure import and export
Cigarette temperature, temperature sensor, which is additionally arranged on flue gas heat-exchange unit low-temperature heat exchange pipe, to be used to measure heat exchange tube wall temperature and is arranged on warm
On the import and export pipeline of wind device；The liquid flow regulating valve is arranged on connecting line, the heating agent of heating agent water system and warm-air drier
It is used to adjust the flow and heat medium water rate of water make-up for entering steam air heater heat medium water on the connecting line of water system and flue gas heat-exchange unit；Control
The temperature signal that device processed is detected according to each temperature sensor controls state and the regulation of booster pump, circulating pump and flow control valve
Into the flow and heat medium water rate of water make-up of steam air heater heat medium water；After overregulating steam air heater outlet First air or Secondary Air or
The temperature control of primary and secondary air is at 50~70 DEG C.It is equipped with and leads at the import of the flue gas heat-exchange unit or import and export flue position
Flow plate.The heat exchanger tube of the windward side of the flue gas heat-exchange unit is provided with wearing-resistant tile, abrasionproof false tube, light pipe built-up welding, the brilliant enamel coating of titanium
Any or its combination.The soot blower form of the flue gas heat-exchange unit is using compound soot-blowing mode, including sonic soot blowing plus arteries and veins
Rush soot blowing, sonic soot blowing plus steam soot blowing mode.The heat exchange element of the flue gas heat-exchange unit using light pipe, extended surface tube, gilled tube,
Membrane tube or spiral grooved tube, material use metal, nonmetallic or composite；In flue gas heat-exchange unit low-temperature heat exchange Guan Shangan
Equipped with wall temperature measurement point, operational factor is adjusted by monitoring wall temperature, it is to avoid occur low-temperature corrosion；The heat exchange element of the steam air heater is adopted
With light pipe, extended surface tube, gilled tube, membrane tube or spiral grooved tube, material selection metal, nonmetallic or composite.It is described
Steam air heater includes main steam air heater and/or secondary steam air heater, wherein main steam air heater is arranged on the supervisor of First air and/or secondary air inlet
On road, temperature point is installed on the import and export pipeline of steam air heater, the heating agent water of steam air heater is entered according to temperature adjustment, is warmed up
Wind device exports the temperature control of First air or Secondary Air or primary and secondary air at 50~70 DEG C；Secondary steam air heater be arranged on First air and/
Or be used to aid in heating First air and/or Secondary Air on the branch pipe(tube) of secondary air inlet；Wherein secondary steam air heater uses auxiliary steam
The temperature of First air and/or Secondary Air is brought up to 0~10 DEG C as thermal source.Flue gas after flue gas heat-exchange unit heat exchange
Stream enters deduster or desulfurizing tower.
A kind of above-mentioned application method of fume afterheat complex control system of the present invention comprises the following steps：
1) flue gas heat-exchange unit, the preparation such as water, emptying on steam air heater are carried out before starting, it is ensured that each part can be transported normally
OK；
2) preheater, steam air heater, flue gas heat-exchange unit, heat medium water water charging system, booster pump, circulation pumping unit, control are opened
The flue gas heat-exchange unit that device is detected according to the temperature sensor of each relevant position exports the heat medium water after cigarette temperature, heat exchanger heating
The temperature of temperature, steam air heater import and export First air and/or Secondary Air, control booster pump and circulating pump, the shape of flow control valve
State, regulation enters the flow and heat medium water rate of water make-up of steam air heater heat medium water, the steam air heater outlet First air or two after overregulating
The temperature control of secondary wind or primary and secondary air is at 50~70 DEG C.
The step 2) in, when fume afterheat complex control system is run in the winter time, the First air of steam air heater import and/
Or secondary air temperature is spent low, the secondary steam air heater of controller control is by the use of auxiliary steam as thermal source by First air and/or secondary air temperature
Degree brings up to 0~10 DEG C.
The system clear principle, it is simple to operate, it rationally make use of fume afterheat, it is not necessary to consume other thermals source, power consumption is few,
Take up an area small, operating cost is low, solve the tight of the preheater low-temperature corrosion of generally existing and stifled ash after current coal unit increase SCR
Weight problem, extends the service life of preheater heat transfer element, improves the efficiency of dust collection of electric cleaner, solves underload hydrogen sulfate
Ammonia condenses break bounds problem, reduces the rate of water make-up of desulphurization system, improves boiler operating efficiency by reducing exhaust gas temperature, reduces coal
Consumption.
The above-mentioned description to embodiment is understood that for ease of those skilled in the art and using this hair
It is bright.Person skilled in the art obviously easily can make various modifications to these embodiments, and described herein
General Principle is applied in other embodiment without passing through performing creative labour.Therefore, the invention is not restricted to implementation here
Example, those skilled in the art do not depart from improvement that scope made and change all should be according to the announcement of the present invention
Within protection scope of the present invention.
Claims (9)
1. a kind of fume afterheat complex control system, it is characterised in that：The control system includes flue gas heat-exchange unit (1), steam air heater
(2), booster pump (3), circulating pump (4), heating agent water system (5), valve member, automatic control system component, the flue gas heat exchange
Device is arranged in preheater outlet (6) on the flue between deduster or on the flue between house outlet and desulfurization entrance；
The steam air heater is connected with preheater by connecting line；The heating agent water system is led to steam air heater, flue gas heat-exchange unit respectively
Connecting line is crossed to be connected；The circulating pump is arranged on the connecting line of heating agent water system and steam air heater；The booster pump is set
Put on the connecting line of heating agent water system and flue gas heat-exchange unit；Heat medium water in heating agent water system is pressurized laggard by booster pump
Enter flue gas heat-exchange unit, then enter steam air heater by circulating pump after being heated by flue gas heat-exchange unit, First air and/or Secondary Air pass through
Enter preheater after steam air heater heating；Returned to by the heat medium water of steam air heater by connecting line and profit is circulated in flue gas heat-exchange unit
With；The automatic control system respectively with flue gas heat-exchange unit, steam air heater, booster pump, circulating pump, heating agent water system, valve member
Control connection；The Valve controlling component includes flow control valve；The automatic control system component includes：Controller, temperature
Sensor；The temperature sensor is connected with controller data signal；The temperature sensor is separately positioned on flue gas heat-exchange unit
It is used to measure import and export cigarette temperature on import and export flue, temperature sensor, which is additionally arranged on flue gas heat-exchange unit low-temperature heat exchange pipe, to be used for
Measure heat exchange tube wall temperature and be arranged on the import and export pipeline of steam air heater；The liquid flow regulating valve is arranged on heating agent
Enter steam air heater for regulation on the connecting line of the connecting line of water system and warm-air drier, heating agent water system and flue gas heat-exchange unit
The flow and heat medium water rate of water make-up of heat medium water；The temperature signal that controller is detected according to each temperature sensor control booster pump,
The state and regulation of circulating pump and flow control valve enter the flow and heat medium water rate of water make-up of steam air heater heat medium water；After overregulating
Steam air heater outlet First air or Secondary Air or primary and secondary air temperature control at 50~70 DEG C.
2. a kind of fume afterheat complex control system according to claim 1, it is characterised in that：The flue gas heat-exchange unit
Deflector is equipped with import or import and export flue position.
3. a kind of fume afterheat complex control system according to claim 1, it is characterised in that：The flue gas heat-exchange unit
The heat exchanger tube of windward side is provided with any or its combination in wearing-resistant tile, abrasionproof false tube, light pipe built-up welding, the brilliant enamel coating of titanium.
4. described a kind of fume afterheat complex control system according to claim 1, it is characterised in that：The flue gas heat exchange
The soot blower form of device adds steam soot blowing mode using compound soot-blowing mode, including sonic soot blowing plus impulse soot blowing, sonic soot blowing.
5. described a kind of fume afterheat complex control system according to claim 1, it is characterised in that：The flue gas heat exchange
The heat exchange element of device use light pipe, extended surface tube, gilled tube, membrane tube or spiral grooved tube, material using metal, it is nonmetallic or
Composite；Wall temperature measurement point is installed on flue gas heat-exchange unit low-temperature heat exchange pipe, operational factor is adjusted by monitoring wall temperature, it is to avoid
Generation low-temperature corrosion；The heat exchange element of the steam air heater uses light pipe, extended surface tube, gilled tube, membrane tube or spiral grooved tube, material
Material is from metal, nonmetallic or composite.
6. a kind of fume afterheat complex control system according to claim 1, it is characterised in that：The steam air heater includes master
Steam air heater and/or secondary steam air heater, wherein main steam air heater is arranged on the main pipeline of First air and/or secondary air inlet, steam air heater
Import and export pipeline on temperature point is installed, according to temperature adjustment enter steam air heater heating agent water, steam air heater export once
The temperature control of wind or Secondary Air or primary and secondary air is at 50~70 DEG C；Secondary steam air heater is arranged on First air and/or secondary air inlet
Branch pipe(tube) on be used to aid in heating First air and/or Secondary Air；Wherein secondary steam air heater is using auxiliary steam as thermal source by one
The temperature of secondary wind and/or Secondary Air brings up to 0~10 DEG C.
7. a kind of fume afterheat complex control system according to claim any one of 1-6, it is characterised in that：By described
Flue gas stream after flue gas heat-exchange unit heat exchange enters deduster or desulfurizing tower.
8. a kind of a kind of application method of fume afterheat complex control system according to any one of claim 1-7, its
It is characterised by：The application method comprises the following steps：
1) flue gas heat-exchange unit, the preparation such as water, emptying on steam air heater are carried out before starting, it is ensured that each part can normally be run；
2) preheater, steam air heater, flue gas heat-exchange unit, heat medium water water charging system, booster pump, circulation pumping unit, controller root are opened
The flue gas heat-exchange unit detected according to the temperature sensor of each relevant position exports the heating agent water temperature after cigarette temperature, heat exchanger heating
The temperature of degree, steam air heater import and export First air and/or Secondary Air, control booster pump and circulating pump, the state of flow control valve,
Regulation enters the flow and heat medium water rate of water make-up of steam air heater heat medium water, steam air heater outlet First air or Secondary Air after overregulating
Or the temperature control of primary and secondary air is at 50~70 DEG C.
9. application method according to claim 8, it is characterised in that：The step 2) in, when fume afterheat Comprehensive Control
When system is run in the winter time, the First air and/or secondary air temperature of steam air heater import spend low, the secondary steam air heater utilization of controller control
First air and/or Secondary Air temperature are brought up to 0~10 DEG C by auxiliary steam as thermal source.
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| CN112629304A (en) * | 2020-12-17 | 2021-04-09 | 国网河北省电力有限公司电力科学研究院 | Coal-fired flue gas waste heat recovery device and method |
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