CN208139316U - A kind of coal unit fume afterheat utilizes and environment friendly system - Google Patents
A kind of coal unit fume afterheat utilizes and environment friendly system Download PDFInfo
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- CN208139316U CN208139316U CN201721855617.7U CN201721855617U CN208139316U CN 208139316 U CN208139316 U CN 208139316U CN 201721855617 U CN201721855617 U CN 201721855617U CN 208139316 U CN208139316 U CN 208139316U
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Abstract
The utility model provides a kind of coal unit fume afterheat and utilizes and environment friendly system.The coal unit smoke waste heat utilization system heats the part water supply in steam turbine heat regenerative system first with the thermal energy of part high-temperature flue gas by high pressure heat exchange component, then by the flue gas after cooling by low pressure heat-exchanging component heat cycles water, the recirculated water after heating is divided into three tunnels and heats cold flue gas, preheating primary and secondary air and heating part condensed water after desulfurization respectively.Converge after this three roads circulating water and first absorb heat through fume afterheat absorber, returns again to low pressure heat-exchanging component.When the system had both solved unit underload or lower ambient temperature, the technical issues of smog discharge temperature needed for completely eliminating chimney rain is only unable to reach by the heat that fume afterheat absorber is collected, the low-temperature corrosion and ammonium hydrogen sulfate adherency blockage problem for also significantly reducing air preheater, play energy conservation and environment protecting well.
Description
Technical field
The utility model relates to coal unit environmental protection and energy-saving field, in particular to the fume afterheat benefits of a kind of coal unit
With and environment friendly system.
Background technique
With continuing to increase for China environmental protection dynamics, flue gas desulfurization dress has generally been installed in thermal power industry
It sets.Wet process of FGD (WFGD) technology becomes because of the series of advantages such as it is applied widely with coal, desulfuration efficiency is high
The dominant technology of domestic and international flue gas desulfurization.
But the saturation wet flue gas temperature after wet desulphurization is relatively low, water capacity is also bigger, in chimney discharge process
It is easy to cause flue gas that cannot effectively be lifted from after throat discharge in the condensed around formation drop of throat, can not spread rapidly
Into atmosphere.The big drop that some of them have little time to spread and evaporate will drop to chimney surrounding ground, be formed " chimney rain ".
" chimney rain " phenomenon will lead to following harm：
The first, the normal life of surrounding resident is influenced；
The second, it is unfavorable for the normal growth of vegetation around and crops；
Facility and building in third, damage settling zone, influence the normal production of power plant.
As people increasingly focus on living environment, environmental problem also more becomes sensitive.Wet desulphurization " chimney rain "
Settlement issues impact the life and production near power station region, and the white cigarette of chimney breast length length also brings apparent view
Feel pollution.Generally only by the way that flue-gas temperature is increased to 80 DEG C of (summer)~100 DEG C (winter) or more, ability from 50 DEG C or so
Enough basic effects for realizing dry smoke stack emission.Currently, mainly using rotary GGH flue gas heater or water-borne formula flue gas heater
Flue gas heat before desulfurizing tower is transferred to after tower in wet flue gas, the temperature of flue gas is improved.And many Large-sized Coal-fired Power groups are completely negative
The design air preheater exhaust gas temperature of lotus is less than 120 DEG C, even lower than 100 DEG C when underload, therefore underload or winter
In the case where be difficult for flue-gas temperature to be heated to required level, it has to put into the high temperature and high pressure steams of a large amount of high-quality into
The auxiliary heat of row, this just leverages the economy of unit.
The preposition air heater (steam air heater) of early stage is mainly to prevent air preheater cold-end air from low-temperature corrosion phenomenon occur
For the purpose of, since acid dew point is generally below 120 DEG C, as long as so air themperature is increased to 20 DEG C~40 by preposition air heater
DEG C it can solve the problems, such as that (flue-gas temperature is increased to 120 DEG C~140 DEG C, cold end mean temperature 70 DEG C~90 for low-temperature corrosion substantially
℃).But with SCR denitration device being widely used in coal-burning power plant, because vanadium series catalyst leads to SO in flue gas3Concentration of emission compared with
Significantly increase and the caused the escaping of ammonia such as SCR denitration device operation is bad, the two reaction generate ammonium hydrogen sulfate.Sulfuric acid
The liquid temperature area of hydrogen ammonium is about 146 DEG C~207 DEG C, its generation be easy to cause low-temperature zone in air preheater liquid sulfur occur
Sour hydrogen ammonium adheres to and in turn results in flying dust deposition and blocking.This phenomenon causes air preheater resistance to be significantly increased, and not only increases
Air-introduced machine power consumption is added, part of generating units also has to reduce load operation due to resistance is excessive has been more than air-introduced machine designed capacity.
To make ammonium hydrogen sulfate deposition region move down and reduce, facilitating soot blowing and water to rinse, (moving down rear flushing pressure can be reduced, and can also subtract
The impact of thermal element is exchanged less), it needs to further increase air preheater import wind-warm syndrome to 75 DEG C~95 DEG C, reduces air preheat
The caloric receptivity of device improves exhaust gas temperature to 145 DEG C~160 DEG C, so that cold end mean temperature reaches 110 DEG C~128 DEG C.
For improving first and second wind-warm syndrome of air preheater entrance, the heat source of traditional steam warming machine is taken out from steam
Vapour, this mode consume a large amount of steam, reduce unit economy.There is part of generating units using water-borne formula waste heat flue gas in recent years
Steam air heater replaces steam heating, has preferable economy, but be similarly faced with underload or do not have in the case where winter
The problem of primary and secondary air is heated to required temperature by enough waste heats can reduce if further increasing high-temperature steam usage amount
Unit economy.
Utility model content
The coal unit fume afterheat utilizes and environment friendly system coal unit fume afterheat utilizes and environment friendly system, feature
It is, which includes high pressure heat exchange component, low pressure heat-exchanging component and fume afterheat absorber；Part high-temperature flue gas first flows through institute
High pressure heat exchange component is stated to heat the partial high pressure water supply in the steam turbine heat regenerative system, then passes through the low pressure heat exchange group
For part to heat the recirculated water flowed through inside the low pressure heat-exchanging component, the recirculated water after heating is divided into three tunnels：All the way to add
Cold flue gas after thermally desulfurizing, all the way to pre-add heat primary air and Secondary Air, finally all the way to heating part condensed water；This three tunnel
Converge the fume afterheat absorber before first flowing through coal unit electric precipitator after circulating water and absorb flue gas heat, then returns
Low pressure heat-exchanging component is returned to continue to heat up.
The utility model can be adjusted according to the temperature and humidity situation of the operating condition of unit, load and external environment
Save the water operation of three road circulation lines.For example, in the case of winter, cold smoke after pre- heat primary air, Secondary Air and heating desulfurizing tower
Heat needed for gas is more, then reduces the quantity of circulating water for heat-setting water until completely closing；If cannot still heat
When to required temperature, then further decreases the confluent of high pressure heat exchange component or open the controllable register of big by-pass flue to increase point
Branch flue flue gas flow.The above design increases the flexibility that smoke waste heat utilization system uses.
Optionally, along boiler tail flue gas main flow direction is disposed with air preheater, the fume afterheat absorbs
Device, electric precipitator, air-introduced machine, wet desulphurization device and flue gas reheater；Flue gas master before the air preheater
Flue is additionally provided with by-pass flue, and part high-temperature flue gas flows through the by-pass flue, the high pressure heat exchange component and low pressure heat exchange
Component is set in turn in the by-pass flue；The ratio for wherein flowing through the high-temperature flue gas of the air preheater is described greater than flowing through
The ratio of the high-temperature flue gas of by-pass flue.
Optionally, flow controllable register, SO are also disposed with inside by-pass flue described in flue gas flow direction3Absorbent spray
Injection device and shutoff door；Wherein, the high pressure heat exchange component, the low pressure heat-exchanging component are sequentially arranged in the SO3Absorbent
Between injection apparatus and the shutoff door.
Optionally, the high pressure heat exchange component has heat exchanging pipe, the partial high pressure after flowing through the heat exchanging pipe heat exchange
Pipeline after water supply heating after final stage high-pressure heater imports main line, carries out heating generation steaming to be transported to boiler
Vapour.
Optionally, the low pressure heat-exchanging component has heat exchanging pipe, flows through the heat exchanging pipe of the low pressure heat-exchanging component
Low pressure recycle water carries out heat exchange with the medium temperature flue gas for having been subjected to the heat exchange of high pressure heat exchange component；And by the low pressure heat-exchanging component
Three road circulating water lines of outflow are provided with valve, for adjusting respective line water to meet different operating conditions to the need of heat
It wants.
Optionally, direction is moved along mainstream smoke, flows through the high-temperature flue gas of the air preheater and to have been subjected to recirculated water pre-
The First air and Secondary Air of heating carry out heat exchange.
Optionally, the low-temperature flue gas flowed out from the air preheater outlet and the low temperature cigarette flowed out from the by-pass flue
Gas flows through the fume afterheat absorber after converging, recycle inside the fume afterheat absorber with three tunnels converged after heat exchange
Water carries out heat exchange, and recirculated water circulates in pipeline under the action of water circulating pump.
Optionally, the flue gas flowed out through the fume afterheat absorber is dusted through the electric precipitator, and described
It is transported to the wet desulphurization device under the action of air-introduced machine and carries out desulfurization and cleaning dust, flows through the wet desulphurization device
Cold flue gas enters the flue gas reheater heating, finally by smoke stack emission into atmosphere.
Optionally, along flow of flue gas direction, the by-pass flue includes the first pipeline section and the second pipeline section, first pipeline section
Circulation area be greater than second pipeline section circulation area, the SO3 sorbent injection device and high pressure heat exchange component are all provided with
It is placed in first pipeline section, the low pressure heat-exchanging component is set to second pipeline section.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of UTILIZATION OF VESIDUAL HEAT IN and environment friendly system in a kind of embodiment of the utility model；
Fig. 2 is the partial schematic diagram of by-pass flue in a kind of embodiment of the utility model.
Wherein, one-to-one relationship of the Fig. 1 into Fig. 2 between each component and appended drawing reference is as follows：
1. boiler, 2.SCR denitrification apparatus, 3. air preheaters, 4. fume afterheat absorbers, 5. low temperature electric precipitators,
6. air-introduced machine, 7. wet desulphurization devices, 8. flue gas reheaters, 9. chimneys, 10. flue gas main pipelines, 10a. by-pass flue,
The first pipeline section of 10a1., the second pipeline section of 10a2., 11. low pressure heat-exchanging components, 12. high pressure heat exchange components, 13. flow controllable registers,
14. water-water heat exchanger, 15. water circulating pumps, 16. preposition air heaters, 17.SO3Sorbent injection device, 18. condensation hydro-thermals
Well, 19. condensate pumps, 20. gland heaters, 21. first low-pressure heaters, 22. second low-pressure heaters, 23. third low pressure
Heater, 24. the 4th low-pressure heaters, 25. the 5th low-pressure heaters, 26. oxygen-eliminating devices, 27. feed pumps, 28. first high pressures add
Hot device, 29. second high-pressure heaters, 30. third high-pressure heaters, 31. boiler economizers.
Specific embodiment
For the prior art cold flue gas after heating desulfurizing tower and preheating primary and secondary air when, Unit Economic performance it is low and
The technical issues of bad adaptability, the utility model have carried out further exploratory development, propose a kind of economy for improving unit
Energy and the utilization of the coal unit fume afterheat of adaptability and environment friendly system.
In order to make those skilled in the art more fully understand the technical solution of the utility model, with reference to the accompanying drawing and have
The utility model is described in further detail for body embodiment.
Referring to FIG. 1, Fig. 1 is the structural schematic diagram of UTILIZATION OF VESIDUAL HEAT IN and environment friendly system in a kind of embodiment of the utility model.
It should be noted that will not also enter the flue gas in air preheater by boiler outflow herein is defined as high temperature cigarette
Gas.
Coal unit fume afterheat utilizes in the utility model and environment friendly system mainly includes：Boiler 1, boiler economizer
31, air feed system, residual heat from boiler fume utilize auxiliary device after system, steam turbine heat regenerative system and furnace etc..
Wherein, fuel is burnt into boiler 1 as hot fume, and the working-medium water inside boiler 1 is heated into steam and is transported to
Steam turbine is converted into mechanical energy, then converts mechanical energy into electric energy by generator.
Air feed system is mainly air needed for air needed for boiler provides fuel combustion or dry powder processed.Air feed system
System may include primary air fan and pressure fan, and outside air enters preposition air heater after primary air fan and pressure fan boosting
16 and air preheater 3 carry out two-step heating, then enter back into boiler.The structure and mounting means of primary air fan and pressure fan can
To refer to the prior art, do not repeat them here herein.It should be noted that in the art usually by the common name of the blower of feeding secondary wind
For pressure fan.
Steam turbine heat regenerative system may include condensed water hot well 18, condensate pump 19, low pressure feed water the heating system being sequentially communicated
System, oxygen-eliminating device 26, feed pump 27 and high-pressure feed water heating system.The condensed water come out from condensed water hot well 18 is through condensate pump
It after 19 boostings, is heated into low pressure feed water heating system, then flows into oxygen-eliminating device 26.It will go out herein from condensed water hot well 18
It is coming, boost to through condensate pump 19 the low pressure working fluid water before oxygen-eliminating device 26 and be defined as condensed water；Always from the outflow of feed pump 27
Working-medium water before to boiler economizer 31 is defined as bearing water.
Wherein low pressure feed water heating system and high-pressure feed water heating system include more than two heaters, such as Fig. 1 institute
Show, include 5 low-pressure heaters and a gland heater 20 in a kind of specific boiler system mesolow feed heating system,
It is followed successively by along condensed water flow direction：Gland heater 20, the first low-pressure heater 21, the second low-pressure heater 22, third low pressure add
Hot device 23, the 4th low-pressure heater 24 and the 5th low-pressure heater 25；High-pressure feed water heating system includes 3 high-pressure heaters,
It is followed successively by along flow direction is born water：First high-pressure heater 28, the second high-pressure heater 29 and third high-pressure heater 30.Low-pressure heating
The particular number of device and high-pressure heater can be selected according to specific unit steam turbine heat regenerative system.
In above-described steam turbine heat regenerative system, it is defeated from the pipeline after the second low-pressure heater 22 to separate partial coagulation water
Main line is back to before oxygen-eliminating device 26 after being heated toward water water- to-water heat exchanger 14；From pipeline after feed pump 27 separate partial high pressure to
The high pressure heat exchange component 12 that water transports to by-pass flue 10a is back to the main line after third high-pressure heater 30 and is sent to pot after heating
Furnace 1.
Auxiliary device mainly includes electric precipitator, air-introduced machine 6, wet desulphurization device 7 and chimney 9 after furnace described herein
Equal components.Wherein electric precipitator can be low temperature electric precipitator 5, and low temperature electric precipitator 5, air-introduced machine 6 are successively installed on de-
Before sulphur device 7, after fume afterheat absorber 4, low temperature electric precipitator 5 is used to collect the dust in flue gas.Air-introduced machine 6 mentions
For the power of flow of flue gas, the flue gas system of upstream is in negative pressure operating status.
It is to be understood that usually electric precipitator generally comprises three types：Hot electrostatic precipitator, low temperature electric precipitator and low
Low temperature electric precipitator.
Wet desulphurization device 7 is used to carry out flue gas desulfurization, i.e. oxysulfide in removal flue gas, chloride and fluorination
Object, and play the role of further cleaning dust, which is set to after air-introduced machine 6.Flue gas through after desulfurizer 7 again
It heats through flue gas reheater 8, is finally emitted into atmosphere by chimney 9.
That is, the flue gas flowed out through fume afterheat absorber 4 is dusted through electric precipitator, and in air-introduced machine 6
It is transported to the progress desulfurization of wet desulphurization device 7 under effect and cleaning dust, the cold flue gas for flowing through wet desulphurization device 7 enter cigarette
Gas reheater 8 heats up, finally by smoke stack emission into atmosphere.
Residual heat from boiler fume is to recycle and utilize flue gas heat using system main function.Along boiler tail flue gas main flow
The heat energy utilization equipment in direction is disposed with air preheater 3, fume afterheat absorber 4 and flue gas reheater 8.More than flue gas
Heat absorber 4 is set to the downstream of air preheater 3, is located at before low temperature electric precipitator 5, empty for further absorbing outflow
Thermal energy in the flue gas of air preheater 3 and by-pass flue 10a is low when substantially 85 DEG C to 95 DEG C of exit gas temperature range
Low temperature electric precipitator 5 works preferably.Flue gas reheater 8 is located at after wet desulphurization device 7.
Part high-temperature flue gas first flows through high pressure in residual heat from boiler fume utilization provided by the utility model and environment friendly system
Heat-exchanging component to heat the partial high pressure water supply in steam turbine heat regenerative system, then pass through low pressure heat-exchanging component with heat flow through it is low
The recirculated water inside heat-exchanging component is pressed, the recirculated water after heating is divided into three tunnels：All the way to heat cold flue gas after desulfurization；It uses all the way
With pre-add heat primary air and Secondary Air；Finally all the way to heating part condensed water；Converge after this three roads circulating water and first flows
Fume afterheat absorber before electric precipitator through coal unit absorbs flue gas heat, and (i.e. recirculated water passes through fume afterheat absorber
Heat up to by the corresponding flue gas indirect heat exchange of fume afterheat absorber), then return rear low pressure heat-exchanging component and carry out heat exchange heating, such as
This moves in circles.
Air preheater, fume afterheat absorber, electric precipitator, air-introduced machine, wet desulphurization device and flue gas reheater
Successively arranged along boiler tail flue gas main flow direction.Also there is branch on flue gas main pipeline 10 before air preheater
Flue 10a, part high-temperature flue gas flow through by-pass flue, and high pressure heat exchange component and low pressure heat-exchanging component are set in turn in the branch
Flue.The ratio for wherein flowing through the high-temperature flue gas of the air preheater is greater than the ratio for flowing through the high-temperature flue gas of the by-pass flue
Example.
Along flue gas flow direction, flow controllable register 13, SO are further provided on by-pass flue 10a3Sorbent injection device
17, high pressure heat exchange component 12 and low pressure heat-exchanging component 11.Flow controllable register 13 is set to the import of by-pass flue 10a, is used for
Adjust the flue gas flow for entering by-pass flue 10a.That is, can be real by the baffle opening for adjusting flow controllable register 13
The adjusting of existing by-pass flue 10a inside smoke flow.
Pass through SO3Sorbent injection device 17 sprays into base absorbent into by-pass flue 10a, by the major part in flue gas
SO3Gas is converted into sulfate.Due to most of SO in flue gas3It is removed, therefore low in ammonium hydrogen sulfate liquid temperature area
Pressure heat-exchanging component 11 will not generate ammonium hydrogen sulfate adherency blockage problem.
High pressure heat exchange component 12 is set to the inside of by-pass flue 10a, and is located at SO3Under sorbent injection device 17
Trip.High pressure heat exchange component 12 has heat exchanging pipe, flows through the high-pressure feed water inside the heat exchanging pipe of high pressure heat exchange component 12 and divides
Flue gas carries out heat exchange in branch flue 10a, i.e., in the high-pressure feed water in 12 heat exchanging pipe of high pressure heat exchange component and by-pass flue 10a
Flue gas carry out heat exchange after be heated up, be then recycled to steam turbine heat regenerative system, wherein high-pressure feed water can be sent back to
Main line is exported to final stage high-pressure heater 30, carries out heating generation steam to be transported to boiler.For high pressure heat exchange component
12 specific structure, herein without limitation.
Low pressure heat-exchanging component 11 is set to the downstream of the high pressure heat exchange component 12, and low pressure heat-exchanging component 11 has heat exchanger tube
Road, the medium temperature flue gas for flowing through the low pressure recycle water of the heat exchanging pipe of low pressure heat-exchanging component 11 and exchanging heat by high pressure heat exchange component 12
Carry out heat exchange；For the specific structure of low pressure heat-exchanging component 11, herein without limitation.Low pressure recycle water is from low low temperature electric
Fume afterheat absorber 4 before deduster 5 exports.Recirculated water after low pressure heat-exchanging component 11 further heating is divided into three
The outlet of road, i.e. low pressure heat-exchanging component 11 has been arranged in parallel the first branch line, second branched pipe road and third branch line.
The heat recirculated water of first branch line is sent to the smoke re-heater 8 after desulfurizing tower 7 and before chimney 9 to add
Flue gas is heated to unsaturated state by wet saturation state by cold flue gas after thermally desulfurizing；
The heat recirculated water on second branched pipe road is sent to the air pre-heater 16 before air preheater 3, to pre-add
Heat primary air and Secondary Air；
The heat recirculated water of third branch line is sent to water-water heat exchanger 14 to heating part condensed water, the condensed water
It can fetch water from the main condensate pipeline between the second low-pressure heater 22 and third low-pressure heater 23, add from the 5th low pressure
Hot device 25 (final stage low-pressure heater) the main condensate pipeline return water before oxygen-eliminating device 26 afterwards.It should be noted that final stage low pressure adds
Hot device is a low-pressure heater last in flow direction.
Above three road recirculated water is merged into after above-mentioned heat exchange is cooling and is conveyed all the way and under the action of water circulating pump 15
Fume afterheat absorber 4 before to low temperature electric precipitator 5 carries out heat temperature raising, returns to low pressure heat-exchanging component and continues to heat up, such as
This moves in circles.
Specifically, in the various embodiments described above, from the low-temperature flue gas of the outlet of air preheater 3 outflow with from by-pass flue 10a
The low-temperature flue gas of outflow flows through fume afterheat absorber 4 after converging, three converged behind 4 inside of fume afterheat absorber and heat exchange
Road recirculated water carries out heat exchange, and recirculated water circulates in pipeline under the action of water circulating pump.
And it is provided with valve by the three road circulating water lines that the low pressure heat-exchanging component flows out, for adjusting respective tube
Road water is to meet different operating conditions to the needs of heat.
Cold flue gas reheating provides the flue gas of higher temperature after this system is First air, Secondary Air preheats and desulfurizing tower
Heat source, but have substantially no effect on unit economy.This system can according to the operating condition of unit, load and external environment,
Adjust the water operation of three road circulation lines.For example, in the case of winter, cold smoke after pre- heat primary air, Secondary Air and heating desulfurization
Heat needed for gas is more, then reduces the quantity of circulating water for heat-setting water until completely closing；If cannot still heat
When to required temperature, then further decreases the confluent of high pressure heat exchange component or open the controllable register of big by-pass flue to increase point
Branch flue flue gas flow.Likewise, in the case where summer or high load capacity, pre- heat primary air, Secondary Air and heating desulfurizing tower
Heat needed for cold flue gas is less afterwards, therefore reduces the quantity of circulating water of this two-way, increases the third branch for being used for heat-setting water
Quantity of circulating water, the steam extraction back-steam machine acting of exclusion low-pressure heating system, saves coal consumption.The above design increases fume afterheat utilization
The flexibility that system uses.
In above-described embodiment, the flue gas in by-pass flue 10a is mixed with by the flue gas of air preheater 3 using flue gas
Residual heat absorber 4 carries out cooling heat transferring, is conducive to the abundant recycling of fume afterheat.
Also, the outlet port of by-pass flue 10a is additionally provided with shut-off valve, for being connected to or disconnecting by-pass flue 10a,
In this way the maintenance of by-pass flue 10a can be realized in non-stop-machine situation.
In the various embodiments described above, part high-temperature flue gas can flow through air preheater, and another part high-temperature flue gas flows through point
Branch flue 10a.
Most of high-temperature flue gas flows through air preheater in the various embodiments described above, and high-temperature flue gas is in air preheater
It is further heated by recirculated water preheating First air and Secondary Air.
Also, cold flue gas can achieve by the way of first fair current again adverse current after the system heat recirculated water heats desulfurizing tower
Be rapidly heated the purpose for protecting heat exchanger tube not to be corroded.Other heat exchange equipments, such as low pressure heat-exchanging component 11, high pressure heat exchange component
12, fume afterheat absorber 4, air pre-heater 16 and water-water heat exchanger 14 are all made of counterflow heat exchange with enhanced heat transfer effect.
The present embodiment other further include that preposition air heater 16 may include the preposition air heater of First air and secondary
The preposition air heater of wind, First air enter a wind separating bin of air preheater 3 through the preposition air heater heating of First air
Entrance, Secondary Air enter 3 secondary air separating storehouse entrance of air preheater through the preposition air heater of Secondary Air.
In addition referring to FIG. 2, Fig. 2 is the partial schematic diagram of by-pass flue in a kind of embodiment of the utility model.
Flue gas temperature after the heat exchange of high pressure heat exchange component 12 reduces in the various embodiments described above, and flow velocity necessarily reduces, in order to
Guarantee flow of flue gas speed, guarantee certain heat transfer intensity and pipe is avoided to arrange dust stratification, therefore along flow of flue gas direction, by-pass flue
10a includes that the circulation area of the first pipeline section 10a1 and the second pipeline section 10a2, the first pipeline section 10a1 is greater than the stream of the second pipeline section 10a2
Logical area, high pressure heat exchange component 12 are set to the first pipeline section 10a1, and low pressure heat-exchanging component 11 is set to the second pipeline section 10a2.
The circulation area of first pipeline section 10a1 and the circulation area of the second pipeline section 10a2 can be arranged as the case may be, herein
Specific introduction is not done, but this does not interfere implementation of the those skilled in that art to technical solution.
By the implementation of the utility model, the cold flue gas after desulfurizing tower 7 first can be heated to 80 by flue gas reheater
It more than DEG C (summer)~100 DEG C (winter), realizes dry smoke stack emission, eliminates chimney rain and long white cigarette phenomenon；
Then, 75 DEG C~95 DEG C are increased into the air themperature of air preheater 3, the average temperature of 3 cold end of air preheater
Degree reaches 110 DEG C~128 DEG C.Ammonium hydrogen sulfate deposition region moves down and reduces in air preheater 3, rinses in conjunction with soot blowing and water,
The increase of 3 resistance of air preheater can be controlled in a lower level, and the low temperature for substantially eliminating air preheater 3 is rotten
Erosion problem；
Finally, the high-pressure heater 12 by by-pass flue 10a heats water supply and heat recirculated water heat-setting water, Ke Yiqi
To the more high-quality steam back-steam machine actings of exclusion heat regenerative system, more electricity are issued in identical coal consumption, are also therefore reduced
Unit net coal consumption rate.
Above to a kind of coal unit fume afterheat provided by the utility model using and environment friendly system carried out in detail
It introduces.Specific case used herein is expounded the principles of the present invention and embodiment, above embodiments
Illustrate the method and its core concept for being merely used to help understand the utility model.It should be pointed out that for the general of the art
For logical technical staff, without departing from the principle of this utility model, several improvement can also be carried out to the utility model
And modification, modifications and modifications also fall within the protection scope of the claims of the utility model.
Claims (9)
1. a kind of coal unit fume afterheat utilizes and environment friendly system, which is characterized in that the system includes high pressure heat exchange component, low
Press heat-exchanging component and fume afterheat absorber；Part high-temperature flue gas flows through the high pressure heat exchange component first to heat the coal burning machine
Then partial high pressure water supply in the steam turbine heat regenerative system of the utilization of group fume afterheat and environment friendly system passes through the low pressure heat exchange
For component to heat the recirculated water flowed through inside the low pressure heat-exchanging component, the recirculated water after heating is divided into three tunnels：All the way to
Cold flue gas after heating desulfurization, all the way to pre-add heat primary air and Secondary Air, finally all the way to heating part condensed water；This three
Converge the fume afterheat absorber before first flowing through coal unit electric precipitator after the circulating water of road and absorbs flue gas heat, then
Low pressure heat-exchanging component is returned to continue to heat up.
2. a kind of coal unit fume afterheat as described in claim 1 utilizes and environment friendly system, which is characterized in that along boiler tail
Portion's mainstream smoke moves direction and is disposed with air preheater, the fume afterheat absorber, electric precipitator, air-introduced machine, wet process
Desulfurizer and flue gas reheater；Flue gas flue collector before the air preheater is additionally provided with by-pass flue, portion
High-temperature flue gas is divided to flow through the by-pass flue, the high pressure heat exchange component and low pressure heat-exchanging component are set in turn in branch's cigarette
Road；The ratio for wherein flowing through the high-temperature flue gas of the air preheater is greater than the ratio for flowing through the high-temperature flue gas of the by-pass flue
Example.
3. a kind of coal unit fume afterheat as claimed in claim 2 utilizes and environment friendly system, which is characterized in that along flue gas stream
Flow controllable register, SO are also disposed with inside to the by-pass flue3Sorbent injection device and shutoff door；Wherein, institute
State high pressure heat exchange component, the low pressure heat-exchanging component is sequentially arranged in the SO3Sorbent injection device and the shutoff door it
Between.
4. a kind of coal unit fume afterheat as claimed in claim 2 utilizes and environment friendly system, which is characterized in that the high pressure
Heat-exchanging component has heat exchanging pipe, in final stage hyperbaric heating after the partial high pressure water supply heating after flowing through the heat exchanging pipe heat exchange
Pipeline after device imports main line, carries out heating generation steam to be transported to boiler.
5. a kind of coal unit fume afterheat as claimed in claim 1 or 2 utilizes and environment friendly system, which is characterized in that described
Low pressure heat-exchanging component has heat exchanging pipe, flow through the low pressure recycle water of the heat exchanging pipe of the low pressure heat-exchanging component with it is excessively high
The medium temperature flue gas of heat-exchanging component heat exchange is pressed to carry out heat exchange；And the three road circulating water lines flowed out by the low pressure heat-exchanging component
It is provided with valve, for adjusting respective line water to meet different operating conditions to the needs of heat.
6. a kind of coal unit fume afterheat as claimed in claim 2 utilizes and environment friendly system, which is characterized in that along flue gas master
Flow direction flows through the high-temperature flue gas of the air preheater and has been subjected to recirculated water preheating First air and Secondary Air progress
Heat exchange.
7. a kind of coal unit fume afterheat as claimed in claim 2 utilizes and environment friendly system, which is characterized in that from the sky
Air preheater exports the low-temperature flue gas of outflow and flows through more than the flue gas after converging from the low-temperature flue gas that the by-pass flue flows out
Heat absorber carries out heat exchange with the three road recirculated waters converged after heat exchange inside the fume afterheat absorber, and recycles
Water circulates in pipeline under the action of water circulating pump.
8. a kind of coal unit fume afterheat as claimed in claim 2 utilizes and environment friendly system, which is characterized in that through the cigarette
The flue gas of gas residual heat absorber outflow is dusted through the electric precipitator, and is transported under the action of the air-introduced machine described
Wet desulphurization device carries out desulfurization and cleaning dust, the cold flue gas for flowing through the wet desulphurization device enter the flue gas and add again
Hot device heating, finally by smoke stack emission into atmosphere.
9. a kind of coal unit fume afterheat as claimed in claim 3 utilizes and environment friendly system, which is characterized in that along flue gas stream
Dynamic direction, the by-pass flue include the first pipeline section and the second pipeline section, and the circulation area of first pipeline section is greater than described second
The circulation area of pipeline section, the SO3Sorbent injection device and high pressure heat exchange component are all set in first pipeline section, described low
Pressure heat-exchanging component is set to second pipeline section.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110425561A (en) * | 2019-07-29 | 2019-11-08 | 上海外高桥第三发电有限责任公司 | A kind of device and method using condensed water backheat heating flue gas |
| CN110594769A (en) * | 2019-10-16 | 2019-12-20 | 福建龙净环保股份有限公司 | Flue gas treatment system |
| CN110726153A (en) * | 2019-09-27 | 2020-01-24 | 华电电力科学研究院有限公司 | Coal-fired power plant flue gas whitening elimination system and method |
| CN111603928A (en) * | 2020-05-24 | 2020-09-01 | 西安交通大学 | Efficient, clean and flexible cooperative coal-fired power generation system and operation method |
| CN111678159A (en) * | 2020-06-09 | 2020-09-18 | 国网天津市电力公司电力科学研究院 | Comprehensive smoke plume treatment system suitable for high-smoke-discharge-temperature coal-fired boiler |
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| CN110425561A (en) * | 2019-07-29 | 2019-11-08 | 上海外高桥第三发电有限责任公司 | A kind of device and method using condensed water backheat heating flue gas |
| CN110726153A (en) * | 2019-09-27 | 2020-01-24 | 华电电力科学研究院有限公司 | Coal-fired power plant flue gas whitening elimination system and method |
| CN110594769A (en) * | 2019-10-16 | 2019-12-20 | 福建龙净环保股份有限公司 | Flue gas treatment system |
| CN111603928A (en) * | 2020-05-24 | 2020-09-01 | 西安交通大学 | Efficient, clean and flexible cooperative coal-fired power generation system and operation method |
| CN111603928B (en) * | 2020-05-24 | 2021-07-06 | 西安交通大学 | Efficient, clean and flexible cooperative coal-fired power generation system and operation method |
| WO2021238322A1 (en) * | 2020-05-24 | 2021-12-02 | 西安交通大学 | Efficient, clean and flexible cooperative coal-fired power generation system and operation method |
| CN111678159A (en) * | 2020-06-09 | 2020-09-18 | 国网天津市电力公司电力科学研究院 | Comprehensive smoke plume treatment system suitable for high-smoke-discharge-temperature coal-fired boiler |
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