CN110145753A - Two-way Cycle afterheat utilizing system and its residual-heat utilization method - Google Patents
Two-way Cycle afterheat utilizing system and its residual-heat utilization method Download PDFInfo
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- CN110145753A CN110145753A CN201910464091.7A CN201910464091A CN110145753A CN 110145753 A CN110145753 A CN 110145753A CN 201910464091 A CN201910464091 A CN 201910464091A CN 110145753 A CN110145753 A CN 110145753A
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- level
- air
- flue gas
- flue
- cooling device
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Abstract
The present invention relates to fume afterheats to utilize technical field more particularly to a kind of Two-way Cycle afterheat utilizing system comprising air preheater system, the level-one UTILIZATION OF VESIDUAL HEAT IN circulatory system, dust pelletizing system, the second level UTILIZATION OF VESIDUAL HEAT IN circulatory system, wet desulfurization system, chimney；The level-one UTILIZATION OF VESIDUAL HEAT IN circulatory system includes level-one flue gas cooling device and eliminating white smoke device, the second level UTILIZATION OF VESIDUAL HEAT IN circulatory system includes secondary smoke cooling device and air heating apparatus, and air preheater system, level-one flue gas cooling device, dust pelletizing system, secondary smoke cooling device, wet desulfurization system, eliminating white smoke device and chimney pass sequentially through flue gas pipeline and be connected to form discharge flue.In addition, the present invention also provides a kind of residual-heat utilization methods of Two-way Cycle afterheat utilizing system.The present invention is utmostly utilized waste heat and significantly reduces air pollution and equipment corrosion etc., while playing a very good protection to environment and equipment itself, rationally utilizes residual heat resources, environmental protection and energy saving.
Description
Technical field
The present invention relates to fume afterheats to utilize technical field more particularly to a kind of Two-way Cycle afterheat utilizing system and its waste heat
Utilize method.
Background technique
With the development of society and the improvement of people's living standards, the people are more urgent to the yearning of fine environment, state
Family puts into effect a series of laws, regulation, policy, measure in succession, is Ecological Civilization Construction and Green Development " escorting ".Coal burning machine
Group minimum discharge transformation realizes the minimum discharge of sulfur dioxide, nitrogen oxides and flue dust, but most of minimum discharge unit is adopted
With Wet Limestone Desulfurization system, about 45 DEG C~55 DEG C of the flue gas after wet desulfurization system desulfurization, flue gas is saturation at this time
Wet flue gas state, saturation wet flue gas is directly from smoke stack emission, and when ambient temperature is lower than its dew-point temperature, a large amount of water recoveries are
Small water droplet is easy to happen moisture condensation, thus generates " white cigarette " phenomenon, therefore will cause certain visual pollution.
Meanwhile SCR denitration process is the mainstream technology of coal unit minimum discharge denitrating flue gas, SCR denitration system outlet
The ammonia of escape can generate ammonium hydrogen sulfate, and for adiabatic condensation temperature generally within the scope of 150 DEG C~200 DEG C, ammonium hydrogen sulfate coagulation can be rotten
The cold end heat exchange original part for losing air preheater system, with the completion that denitration minimum discharge is transformed, the ammonia of SCR denitration system outlet escape
Amount is more difficult to control, and the concentration of ammonium hydrogen sulfate increases to aggravate the corrosion of air preheater cold end heat exchange element, in minimum discharge situation
Under to the corrosion resistance of air preheater, more stringent requirements are proposed.
How air preheater corrosion is effectively reduced in actual motion after flue gas minimum discharge transformation, effectively eliminated simultaneously
The visual pollution of " white cigarette " is a general orientation of next step efforts at environmental protection.
Summary of the invention
(1) technical problems to be solved
The present invention provides a kind of Two-way Cycle afterheat utilizing system and its residual-heat utilization method, it is intended to solve to be generated by " white cigarette "
Visual pollution and the serious problem of air preheater system corrosion.
(2) technical solution
In order to achieve the above object, the main technical schemes that the present invention uses include: air preheater system, level-one UTILIZATION OF VESIDUAL HEAT IN
The circulatory system, dust pelletizing system, the second level UTILIZATION OF VESIDUAL HEAT IN circulatory system, wet desulfurization system, chimney；The level-one UTILIZATION OF VESIDUAL HEAT IN circulation
System includes level-one flue gas cooling device and eliminating white smoke device, and the second level UTILIZATION OF VESIDUAL HEAT IN circulatory system includes that secondary smoke is cooling
Device and air heating apparatus, the air preheater system, the level-one flue gas cooling device, the dust pelletizing system, the second level
Flue gas cooling device, the wet desulfurization system, the eliminating white smoke device and the chimney pass sequentially through flue gas pipeline connection
Form discharge flue；The level-one flue gas cooling device and the eliminating white smoke device also pass through level-one pipeline connection formation level-one and follow
Loop back path, the secondary smoke cooling device and the air heating apparatus also pass through second level pipeline connection and form secondary cycle time
Road；The air heating apparatus also with the air preheater system connectivity and make atmosphere temperature rising into the air preheater system.
Preferably, the level-one UTILIZATION OF VESIDUAL HEAT IN circulatory system further includes the level-one heat medium water being set on the level-one pipeline
The water inlet of circulating pump, the water outlet of the level-one flue gas cooling device and the eliminating white smoke device passes through level-one piping connection,
The water inlet of the water outlet of the eliminating white smoke device and the level-one flue gas cooling device passes through level-one piping connection.
Preferably, the level-one flue gas cooling device can make the flue-gas temperature into the dust pelletizing system by 175 DEG C~
190 DEG C are reduced to 115 DEG C~130 DEG C, and the eliminating white smoke device can be by the flue-gas temperature after the desulphurization system desulfurization
80 DEG C~90 DEG C are increased to by 45 DEG C~55 DEG C.
Preferably, the second level UTILIZATION OF VESIDUAL HEAT IN circulatory system further includes the second level heat medium water for being set to the diode road
The water inlet of circulating pump, the water outlet of secondary smoke cooling device and the air heating apparatus passes through second level piping connection, institute
The water inlet of the water outlet and the secondary smoke cooling device of stating air heating apparatus passes through second level piping connection.
Preferably, the secondary smoke cooling device can make the flue-gas temperature into the wet desulfurization system by 115
DEG C~130 DEG C be reduced to 75 DEG C~90 DEG C, the air heating apparatus will enter the air themperature of air preheater system by 15 DEG C~
25 DEG C are increased to 40 DEG C~50 DEG C.
Preferably, the air after the air heating means heats enters in air preheater system, can make the sky
The flue-gas temperature of the outlet of pre- device system is increased to 175 DEG C~190 DEG C by 150 DEG C~165 DEG C.
Preferably, the air heating apparatus further includes pressure fan, and the pressure fan enters with the air heating apparatus
By piping connection, the air intake vent of the air outlet of the air heating apparatus and the air preheater system passes through pipeline company in air port
It connects.
Preferably, the UTILIZATION OF VESIDUAL HEAT IN binary cycle system further includes air-introduced machine, and the air-introduced machine is set to the dedusting system
On flue gas pipeline between system and the secondary smoke cooling device.
Further, the present invention also provides a kind of residual-heat utilization method of Two-way Cycle afterheat utilizing system, the Two-way Cycles
The residual-heat utilization method of afterheat utilizing system includes the following contents: entering sky by the air after the air heating means heats
In pre- device system, the air after heating is increased to the flue-gas temperature of the air preheater system outlet by 150 DEG C~165 DEG C
175 DEG C~190 DEG C；
The flue gas flowed out from the air preheater system flows into the level-one flue gas cooling device to flue gas by flue gas pipeline
Once cooled down, by level-one flue gas cooling device heat exchange can make the flue-gas temperature into the dust pelletizing system by
175 DEG C~190 DEG C are reduced to 115 DEG C~130 DEG C；
Flue gas flows through the air-introduced machine from the dust pelletizing system and carries out two to flue gas into the secondary smoke cooling device
Secondary cooling, by the secondary smoke cooling device exchange heat so that into the wet desulfurization system flue-gas temperature by 115 DEG C
~130 DEG C are reduced to 75 DEG C~90 DEG C；
The wet desulfurization system can make flue-gas temperature be reduced to 45 DEG C~55 DEG C by 75 DEG C~90 DEG C, and flue gas is from described wet
The outflow of method desulphurization system enters in the eliminating white smoke device, and the eliminating white smoke device can be such that flue-gas temperature is increased by 45 DEG C~55 DEG C
To 80 DEG C~90 DEG C, finally, being discharged by the flue gas of the eliminating white smoke device by the chimney.
(3) beneficial effect
The beneficial effects of the present invention are: the heat exchange drop of the level-one flue gas cooling device by the level-one UTILIZATION OF VESIDUAL HEAT IN circulatory system
The low flue-gas temperature and exhaust gas volumn for entering dust pelletizing system, eliminating white smoke device to the flue gas after wet desulfurization system desulfurization into
Row heating, to eliminate the visual pollution from chimney discharge " white cigarette "；Pass through the secondary smoke of the second level UTILIZATION OF VESIDUAL HEAT IN circulatory system
The heat exchange of cooling device reduces flue-gas temperature and exhaust gas volumn into wet desulfurization system, while air heating apparatus heats again
Air into air preheater system, and then the flue-gas temperature of air preheater system outlet flue is improved, to effectively reduce empty pre-
The low-temperature corrosion of device system cold end prevents air preheater system jams, improves the corrosion resistance of air preheater system；In addition, dedusting
System and wet desulfurization system are combined closely, and the efficiency of wet desulphurization and dedusting, second level UTILIZATION OF VESIDUAL HEAT IN circulation are effectively increased
System also reduces the flue-gas temperature and exhaust gas volumn of wet desulfurization system smoke inlet, can also reduce wet desulfurization system cooling and steam
Water loss caused by hair.By the technical solution of the application, waste heat is utmostly utilized and significantly reduces air pollution
With equipment corrosion etc., while playing a very good protection to environment and equipment itself, rationally utilize residual heat resources, environmental protection section
Can, there is very big market popularization value.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of Two-way Cycle afterheat utilizing system of the invention.
[description of symbols]
1: air preheater system；2: the level-one UTILIZATION OF VESIDUAL HEAT IN circulatory system；3: dust pelletizing system；4: air-introduced machine；5: second level waste heat benefit
Use the circulatory system；6: wet desulfurization system；7: chimney；8: level-one flue gas cooling device；9: eliminating white smoke device；10: level-one heating agent
Water-circulating pump；11: secondary smoke cooling device；12: air heating apparatus；13: second level heating agent water-circulating pump；14: pressure fan；
15: level-one pipeline；16: second level pipeline.
Specific embodiment
In order to preferably explain the present invention, in order to understand, with reference to the accompanying drawing, by specific embodiment, to this hair
It is bright to be described in detail.
It is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute is only used in the embodiment of the present invention
In explaining in relative positional relationship, the motion conditions etc. under a certain particular pose (as shown in the picture) between each component, if should
When particular pose changes, then directionality instruction also correspondingly changes correspondingly.
In addition, the description for being such as related to " first ", " second " in the present invention is used for description purposes only, and should not be understood as
Its relative importance of indication or suggestion or the quantity for implicitly indicating indicated technical characteristic.Define as a result, " first ",
The feature of " second " can explicitly or implicitly include at least one of the features.In the description of the present invention, " multiple " contain
Justice is at least two, such as two, three etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " connection ", " fixation " etc. shall be understood in a broad sense,
For example, " fixation " may be a fixed connection, it may be a detachable connection, or integral；It can be mechanical connection, be also possible to
Electrical connection；It can be directly connected, the connection inside two elements or two can also be can be indirectly connected through an intermediary
The interaction relationship of a element, unless otherwise restricted clearly.It for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term in the present invention.
The present invention provides a kind of Two-way Cycle afterheat utilizing system, as shown in Figure 1 comprising air preheater system 1, level-one waste heat
Utilize the circulatory system 2, dust pelletizing system 3, the second level UTILIZATION OF VESIDUAL HEAT IN circulatory system 5, wet desulfurization system 6, chimney 7.Level-one waste heat benefit
It include level-one flue gas cooling device 8 and eliminating white smoke device 9 with the circulatory system 2；The second level UTILIZATION OF VESIDUAL HEAT IN circulatory system 5 includes second level cigarette
Air cooling device 11 and air heating apparatus 12.Air preheater system 1, level-one flue gas cooling device 8, dust pelletizing system 3, secondary smoke
Cooling device 11, wet desulfurization system 6, eliminating white smoke device 9 and chimney 7, which pass sequentially through flue gas pipeline and be connected to be formed to discharge fume, to be led to
Road；Level-one flue gas cooling device 8 also is connected to form primary cycle circuit with eliminating white smoke device 9 by level-one pipeline 15, second level cigarette
Air cooling device 11 also is connected to form secondary cycle circuit with air heating apparatus 12 by second level pipeline 16；Air heating apparatus
12 are also connected to air preheater system 1 and make the atmosphere temperature rising into air preheater system 1.
Wherein, it aggravates and emits " white cigarette " the present invention overcomes air preheater corrosion existing for existing coal-fired minimum discharge unit
The deficiency of visual pollution, while controlling flue dust and SO2 emissions, realizing reduces the corrosion of air preheater system 1 and disappears
Except the purpose of " white cigarette " visual pollution.It is reduced by the heat exchange of the level-one flue gas cooling device 8 of the level-one UTILIZATION OF VESIDUAL HEAT IN circulatory system 2
Enter the flue-gas temperature and exhaust gas volumn of dust pelletizing system 3,9 pairs of eliminating white smoke device add by the flue gases of wet desulfurization systems 6
Heat, to eliminate the visual pollution that " white cigarette " is discharged from chimney 7；Secondary smoke by the second level UTILIZATION OF VESIDUAL HEAT IN circulatory system 5 is cold
But the heat exchange of device 11 reduces flue-gas temperature and exhaust gas volumn into wet desulfurization system 6, while air heating apparatus 12 is again
Heating enters the air in air preheater system 1, and then improves the flue-gas temperature of 1 outlet flue of air preheater system, to effectively drop
The low-temperature corrosion of low 1 cold end of air preheater system prevents air preheater system 1 from blocking, and reduces the running resistance of air preheater system 1, mentions
The corrosion resistance of high air preheater system 1；In addition, combining closely for dust pelletizing system 3 and wet desulfurization system 6, can effectively improve
The efficiency of dedusting and wet desulphurization, the second level UTILIZATION OF VESIDUAL HEAT IN circulatory system 5 reduce the flue-gas temperature of 6 smoke inlet of wet desulfurization system
And exhaust gas volumn, water loss caused by the cooling evaporation of wet desulfurization system 6 can also be reduced, is conducive to save water resource.
Further, the level-one UTILIZATION OF VESIDUAL HEAT IN circulatory system 2 further includes that the level-one heat medium water being set on level-one pipeline 15 follows
Ring pump 10, level-one heating agent water-circulating pump 10 are conducive to the realization of the water in water and eliminating white smoke device 9 in level-one flue gas cooling device 8
Circulation, heat medium water are provided for heating flue gas by heating agent water tank.Wherein, level-one flue gas cooling device 8 and eliminating white smoke device 9
In flue gas pipeline and water route it is mutually indepedent, not will do it fluid communication, but be able to carry out heat exchange.The cooling dress of level-one flue gas
It sets 8 water outlet and the water inlet of eliminating white smoke device 9 passes through level-one pipeline 15 and connect, the water outlet and level-one of eliminating white smoke device 9
The water inlet of flue gas cooling device 8 is connected by level-one pipeline 15, and level-one flue gas cooling device 8 once cools down to flue gas,
Eliminating white smoke device 9 and level-one flue gas cooling device 8, can be continuously and effectively by one water-flow circuit of formation of level-one pipeline 15
Mist heat recovering improves recovery efficiency.8 Mist heat recovering of level-one flue gas cooling device heat heat medium water, while can make into
The flue-gas temperature for entering dust pelletizing system 3 is reduced to 115 DEG C~130 DEG C by 175 DEG C~190 DEG C.
Wherein, about 45 DEG C~55 DEG C of the flue gas after 6 desulfurization of wet desulfurization system, flue gas is saturation wet flue gas shape at this time
State, if saturation wet flue gas is directly discharged from chimney 7, when ambient temperature is lower than its dew-point temperature, a large amount of water recovery is
Small water droplet is easy to happen moisture condensation, thus generates " white cigarette " phenomenon, therefore will cause certain visual pollution.In order to eliminate by " white
The visual pollution that cigarette " generates, the heat medium water after being heated by Mist heat recovering enter eliminating white smoke device by level-one pipeline 15
9, the flue-gas temperature after the desulphurization system desulfurization can be increased to 80 DEG C~90 by 45 DEG C~55 DEG C by eliminating white smoke device 9
DEG C, so as to heat the flue gas entered in eliminating white smoke device 9 from wet desulfurization system 6, when flue gas is heated to 80 DEG C~90
DEG C when, flue gas belongs to unsaturated state, and flue gas has certain degree of unsaturation at this time, will not condense, therefore can realize elimination
The effect of " white cigarette ".
In addition, the second level UTILIZATION OF VESIDUAL HEAT IN circulatory system 5 further includes the second level heating agent water-circulating pump being set on second level pipeline 16
13, second level heating agent water-circulating pump 13 is conducive to the realization of the water in the water and air heating device 12 in secondary smoke cooling device 11
Circulation, heat medium water are provided for heating air by heating agent water tank.Flue gas pipeline and water route in secondary smoke cooling device 11
Independently of each other, the air pipe line in air heating apparatus 12 and water route are mutually indepedent, not will do it fluid communication, but be able to carry out
Heat exchange.The water outlet of secondary smoke cooling device 11 and the water inlet of air heating apparatus 12 are connected by second level pipeline 16
It connects, the water outlet of air heating apparatus 12 is connect with the water inlet of secondary smoke cooling device 11 by second level pipeline 16, second level
Flue gas cooling device 11 can be cooled down twice flue gas, and secondary smoke cooling device 11 and air heating apparatus 12 pass through second level
Pipeline 16 forms a water-flow circuit, can continue Mist heat recovering, improves recovery efficiency.Secondary smoke cooling device 11
Mist heat recovering heats heat medium water, while the flue-gas temperature into wet desulfurization system 6 can be made to be reduced by 115 DEG C~130 DEG C
To 75 DEG C~90 DEG C, heat medium water after Mist heat recovering enters air heating apparatus 12 by second level pipeline 16, and air adds
The air themperature for entering air preheater system 1 can be increased to 40 DEG C~50 DEG C by 15 DEG C~25 DEG C by thermal 12, be improved empty pre-
The air themperature of 1 entrance of device system improves the outlet of air preheater system 1 to reduce the heat exchange amount of air preheater system 1
Flue-gas temperature, and then realize the effect for reducing the corrosion of air preheater system 1.
Wherein, due to that can generate ammonium hydrogen sulfate from the ammonia of SCR denitration system outlet escape, adiabatic condensation temperature is generally 150
DEG C~200 DEG C within the scope of, the flue-gas temperature of 1 outlet of air preheater system is 150 DEG C~165 when not using technical solution of the present invention
DEG C, the cold end heat exchange original part of the heavy corrosion air preheater system 1 of ammonium hydrogen sulfate coagulation meeting at this time, using technical solution of the present invention
When, the air after being heated by the air heating apparatus 12 using Mist heat recovering enters in air preheater system 1, can make sky
The flue-gas temperature that pre- device system 1 exports is increased to 175 DEG C~190 DEG C by 150 DEG C~165 DEG C, and sky can be reduced in advance by improving smoke temperature
The low-temperature corrosion of 1 cold end of device system, heats air by recovery waste heat, moreover it is possible to which the consumption for reducing energy makes full use of resource.
Further, air heating apparatus 12 further includes pressure fan 14, the inlet air of pressure fan 14 and air heating apparatus 12
Mouth passes through piping connection, pressure fan by piping connection, the air outlet of air heating apparatus 12 and the air intake vent of air preheater system 1
14 enable to air endlessly to enter in air preheater system 1, enable 12 continuous heating air of air heating apparatus,
And it can guarantee that flue gas that air preheater system 1 exports always within the scope of 175 DEG C~190 DEG C, improves the cigarette of 1 cold end of air preheater system
Temperature degree, ammonium hydrogen sulfate condenses reduction at cold end, to reduce the cold end corrosion of air preheater system 1.
It is preferably carried out in mode in another kind, UTILIZATION OF VESIDUAL HEAT IN binary cycle system of the invention further includes air-introduced machine 4, air inducing
Machine 4 is set on the flue gas pipeline between dust pelletizing system 3 and secondary smoke cooling device 11, is played good guiding function, is made
Secondary smoke cooling device 11 can be timely entered by obtaining all flue gases flowed out from dust pelletizing system 3, accelerate second level UTILIZATION OF VESIDUAL HEAT IN
The waste heat removal process of the circulatory system 5, to improve the efficiency of UTILIZATION OF VESIDUAL HEAT IN.
Below by way of the residual-heat utilization method to Two-way Cycle afterheat utilizing system be illustrated come the present invention is further explained
Technical solution.
Firstly, the air after being heated by air heating apparatus 12 enters in air preheater system 1, the air after heating makes
The flue-gas temperature that air preheater system 1 exports is increased to 175 DEG C~190 DEG C by 150 DEG C~165 DEG C；
The flue gas flowed out from air preheater system 1 flows into level-one flue gas cooling device 8 by flue gas pipeline and carries out one to flue gas
Secondary cooling, being exchanged heat by level-one flue gas cooling device 8 can be such that the flue-gas temperature into dust pelletizing system 3 is dropped by 175 DEG C~190 DEG C
As low as 115 DEG C~130 DEG C；
Flue gas flows through air-introduced machine 4 from dust pelletizing system 3 and is cooled down twice into secondary smoke cooling device 11 to flue gas, leads to
The heat exchange of secondary smoke cooling device 11 is crossed so that the flue-gas temperature into wet desulfurization system 6 is reduced to 75 by 115 DEG C~130 DEG C
DEG C~90 DEG C；
Wet desulfurization system 6 can make flue-gas temperature be reduced to 45 DEG C~55 DEG C by 75 DEG C~90 DEG C, and flue gas is from wet desulphurization
The outflow of system 6 enters in eliminating white smoke device 9, and eliminating white smoke device 9 can make flue-gas temperature be increased to 80 DEG C~90 by 45 DEG C~55 DEG C
DEG C, finally, the flue gas by eliminating white smoke device 9 is discharged by chimney 7.
The residual-heat utilization method can be dropped by the heat exchange of the level-one flue gas cooling device 8 of the level-one UTILIZATION OF VESIDUAL HEAT IN circulatory system 2
The low flue-gas temperature and exhaust gas volumn for entering dust pelletizing system 3,9 pairs of the eliminating white smoke device flue gases by wet desulfurization systems 6 carry out
Heating, to eliminate the visual pollution that " white cigarette " is discharged from chimney 7；Pass through the secondary smoke of the second level UTILIZATION OF VESIDUAL HEAT IN circulatory system 5
The heat exchange of cooling device 11 reduces flue-gas temperature and exhaust gas volumn into wet desulfurization system 6, while air heating apparatus 12
Heating enters the air in air preheater system 1 again, and then improves the flue-gas temperature of 1 outlet flue of air preheater system, thus effectively
Reduce the low-temperature corrosion of 1 cold end of air preheater system.It, can utmostly using waste heat and effectively by this residual-heat utilization method
Air pollution and equipment corrosion etc. are reduced, while being played a very good protection to environment and equipment itself, and utilizes waste heat ring
Protect energy conservation.
It is to be appreciated that describing the skill simply to illustrate that of the invention to what specific embodiments of the present invention carried out above
Art route and feature, its object is to allow those skilled in the art to can understand the content of the present invention and implement it accordingly, but
The present invention is not limited to above-mentioned particular implementations.All various changes made within the scope of the claims are repaired
Decorations, should be covered by the scope of protection of the present invention.
Claims (9)
1. a kind of Two-way Cycle afterheat utilizing system, which is characterized in that the Two-way Cycle afterheat utilizing system includes: air preheater system
System, the level-one UTILIZATION OF VESIDUAL HEAT IN circulatory system, dust pelletizing system, the second level UTILIZATION OF VESIDUAL HEAT IN circulatory system, wet desulfurization system, chimney；It is described
The level-one UTILIZATION OF VESIDUAL HEAT IN circulatory system includes level-one flue gas cooling device and eliminating white smoke device, the second level UTILIZATION OF VESIDUAL HEAT IN circulatory system
Including secondary smoke cooling device and air heating apparatus, the air preheater system, described is removed the level-one flue gas cooling device
Dirt system, the secondary smoke cooling device, the wet desulfurization system, the eliminating white smoke device and the chimney successively lead to
Flue gas pipeline is crossed to be connected to form discharge flue；The level-one flue gas cooling device and the eliminating white smoke device also pass through level-one pipeline
Connection forms primary cycle circuit, and the secondary smoke cooling device and the air heating apparatus also pass through second level pipeline connection
Form secondary cycle circuit；The air heating apparatus also with the air preheater system connectivity and make enter the air preheater system
Atmosphere temperature rising.
2. Two-way Cycle afterheat utilizing system as described in claim 1, it is characterised in that: the level-one UTILIZATION OF VESIDUAL HEAT IN circulatory system
It further include the level-one heating agent water-circulating pump being set on the level-one pipeline, the water outlet of the level-one flue gas cooling device and institute
The water inlet of eliminating white smoke device is stated by level-one piping connection, the water outlet of the eliminating white smoke device and the level-one flue gas are cooling
The water inlet of device passes through level-one piping connection.
3. Two-way Cycle afterheat utilizing system as described in claim 2, it is characterised in that: the level-one flue gas cooling device energy
The flue-gas temperature into the dust pelletizing system is enough set to be reduced to 115 DEG C~130 DEG C by 175 DEG C~190 DEG C, the eliminating white smoke device
Flue-gas temperature after the desulphurization system desulfurization can be increased to 80 DEG C~90 DEG C by 45 DEG C~55 DEG C.
4. Two-way Cycle afterheat utilizing system as described in claim 1, it is characterised in that: the second level UTILIZATION OF VESIDUAL HEAT IN circulatory system
It further include the second level heating agent water-circulating pump for being set to the diode road, the water outlet of secondary smoke cooling device and the sky
For the water inlet of gas heating device by second level piping connection, the water outlet of the air heating apparatus and the secondary smoke are cooling
The water inlet of device passes through second level piping connection.
5. Two-way Cycle afterheat utilizing system as claimed in claim 4, it is characterised in that: the secondary smoke cooling device can
The flue-gas temperature into the wet desulfurization system is set to be reduced to 75 DEG C~90 DEG C by 115 DEG C~130 DEG C, the air heating dress
It sets and the air themperature for entering air preheater system is increased to 40 DEG C~50 DEG C by 15 DEG C~25 DEG C.
6. the Two-way Cycle afterheat utilizing system as described in any one of claim 1-5, it is characterised in that: pass through the air
Air after heating devices heat enters in air preheater system, can make the flue-gas temperature of the outlet of the air preheater system by
150 DEG C~165 DEG C are increased to 175 DEG C~190 DEG C.
7. the Two-way Cycle afterheat utilizing system as described in any one of claim 1-5, it is characterised in that: the air heating
Device further includes pressure fan, and by piping connection, the air adds the air intake vent of the pressure fan and the air heating apparatus
The air outlet of thermal and the air intake vent of the air preheater system pass through piping connection.
8. the UTILIZATION OF VESIDUAL HEAT IN binary cycle system as described in any one of claim 1-5, it is characterised in that: the UTILIZATION OF VESIDUAL HEAT IN
Binary cycle system further includes air-introduced machine, and the air-introduced machine is set between the dust pelletizing system and the secondary smoke cooling device
Flue gas pipeline on.
9. a kind of residual-heat utilization method of the Two-way Cycle afterheat utilizing system as described in any one of claim 1-8, special
Sign is: being entered in air preheater system by the air after the air heating means heats, the air after heating makes described
The flue-gas temperature of air preheater system outlet is increased to 175 DEG C~190 DEG C by 150 DEG C~165 DEG C；
The flue gas flowed out from the air preheater system flows into the level-one flue gas cooling device by flue gas pipeline and carries out to flue gas
Primary cooling can make the flue-gas temperature into the dust pelletizing system by 175 DEG C by level-one flue gas cooling device heat exchange
~190 DEG C are reduced to 115 DEG C~130 DEG C；
Flue gas flows through the air-introduced machine from the dust pelletizing system and carries out secondary drop to flue gas into the secondary smoke cooling device
Temperature, by the secondary smoke cooling device exchange heat so that into the wet desulfurization system flue-gas temperature by 115 DEG C~130
DEG C it is reduced to 75 DEG C~90 DEG C；
The wet desulfurization system can make flue-gas temperature be reduced to 45 DEG C~55 DEG C by 75 DEG C~90 DEG C, and flue gas is de- from the wet process
The outflow of sulphur system enters in the eliminating white smoke device, and the eliminating white smoke device can make flue-gas temperature be increased to 80 by 45 DEG C~55 DEG C
DEG C~90 DEG C, finally, being discharged by the flue gas of the eliminating white smoke device by the chimney.
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