CN207006112U - A kind of heat of smoke discharged from boiler of power station deep exploitation and water reclamation system - Google Patents
A kind of heat of smoke discharged from boiler of power station deep exploitation and water reclamation system Download PDFInfo
- Publication number
- CN207006112U CN207006112U CN201720646110.4U CN201720646110U CN207006112U CN 207006112 U CN207006112 U CN 207006112U CN 201720646110 U CN201720646110 U CN 201720646110U CN 207006112 U CN207006112 U CN 207006112U
- Authority
- CN
- China
- Prior art keywords
- air
- boiler
- heat
- flue gas
- heat exchanger
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
Landscapes
- Air Supply (AREA)
Abstract
A kind of heat of smoke discharged from boiler of power station deep exploitation and water reclamation system, including First air heating subsystem, warm wind subsystem, the pre- thermal sub-system of cold wind, gas bypass is set after denitrification apparatus, before boiler air preheater, flue is converged to after boiler air preheater, First air heating subsystem is arranged at gas bypass；Boiler main air supply pipeline passes through the pre- thermal sub-system of cold wind and warm wind subsystem successively, and primary air duct and Secondary Air pipeline are divided into after warm wind subsystem；Primary air duct heats First air by First air heating subsystem using flue gas heat in gas bypass；Warm wind subsystem is used to heat cold wind；The pre- thermal sub-system of cold wind carries out air-supply preheating, while condensate in recovered flue gas for absorbing flue gas heat；Energy-saving effect is big, and the recovery of water can be realized while energy-conservation, good to the adaptability of load and environment temperature.
Description
Technical field
Boiler exhaust gas waste heat recovery is the utility model is related to, specially a kind of waste heat deep exploitation and water reclamation system.
Background technology
The heat loss due to exhaust gas of boiler is the main heat loss of modern large coal-fired power plant boiler, accounts for the 4% of fuel thermal discharge
Left and right, according to traditional thermal power plant's production procedure, this partial heat is with fume emission to atmospheric environment.As residual heat resources, pot
Stove smoke discharging residual heat has that source temperature is high, quantity is big, and recycles the features such as facilitating, and in China, Thermal Power Generation Industry has obtained extensively
General application.Recovery smoke discharging residual heat simultaneously carries out efficient utilization and can improve the heat-economy of fired power generating unit, more than traditional boiler exhaust gas
Recuperation of heat is by UTILIZATION OF VESIDUAL HEAT IN in the relatively low bleeder heater of extraction pressure, and its energy-saving effect is typically in 1.5g/kWh or so.
What is occurred in recent years sets gas bypass and steam air heater to improve the grade of waste heat recovery in residual neat recovering system, real
The deep exploitation of existing smoke discharging residual heat.Steam air heater is introduced in smoke waste heat recovery system and draws gas bypass from air preheater entrance
The methods of, UTILIZATION OF VESIDUAL HEAT IN typically can may be used in the higher low-pressure heater of extraction pressure, or even high-pressure heater, its energy-saving effect
Reach 3.0g/kWh or so.But using flue gas is gone out from air preheater leading after, flue gas flow in air preheater is reduced, flue gas
Exchange capability of heat declines, even if increase air preheater import wind pushing temperature, air preheater outlet Secondary Air temperature also declines more, very great Cheng
The effect of waste heat recovery is counteracted on degree.To ensure certain Secondary Air temperature, in actual system design, gas bypass flow
Value is very limited so that the high-grade waste heat quantity reclaimed is reduced, and have impact on the energy-saving effect of system.
When the residual neat recovering system using steam air heater operates in underload or the relatively low operating mode of environment temperature, due to air-supply
Temperature is relatively low, for the flue-gas temperature of control system end, flue gas heat-exchange unit is occurred without corrosion, it is necessary to which waste heat time is greatly reduced
Quantity is received, so that its energy-saving effect declines rapidly.
It can be seen that being bypassed in existing system, flue gas flow is small to limit the recovery quantity for making high-grade waste heat, and in environment temperature
Flue gas heat-exchange unit easily corrodes when spending relatively low.
In addition, the air preheater of existing station boiler is mostly three points of storehouses, First air, Secondary Air enter air preheater, due to cigarette
The ratio of heat capacities air of gas is big, and First air is also heated to higher temperature.To ensure pulverized coal preparation system safe operation, it has to
Cold wind is blended in First air after heating to control its temperature.With certain power plant 660MW supercritical units, its air preheater exports once
Air temperature has reached 330 DEG C makes its temperature control below 200 DEG C, it is necessary to blend cold wind, makes the increase of system irreversible loss.
Utility model content
To solve the above problems, the utility model proposes set external First air heater to improve gas bypass stream
The recovery quantity of amount, increase high-grade fume afterheat, and can directly heat to required temperature；By reclaiming desulfurizing tower exiting flue gas
Waste heat preheated air, the corrosion for the heat exchanger that removes smoke simultaneously further improve waste heat recovery quantity；Exported by cooling down desulfurizing tower
Flue gas can obtain substantial amounts of condensate to realize Water Sproading.
What technical solution of the present utility model was realized in：
A kind of heat of smoke discharged from boiler of power station deep exploitation and water reclamation system, including First air heating subsystem, warm wind
The pre- thermal sub-system of system, cold wind, gas bypass is set after denitrification apparatus, before boiler air preheater, boiler air preheater it
After converge to flue, First air heating subsystem is arranged at gas bypass；Characterized in that, boiler main air supply pipeline is successively
By the pre- thermal sub-system of cold wind and warm wind subsystem, primary air duct and Secondary Air pipeline are divided into after warm wind subsystem；Once
Air pipe line heats First air by First air heating subsystem using flue gas heat in gas bypass；Secondary Air pipeline is connected to
Boiler air preheater；Warm wind subsystem be arranged on boiler air preheater after, the flue before electric dust-removing equipment, for absorbing flue gas heat
Amount heating cold wind；The pre- thermal sub-system of cold wind is arranged on the flue after desulphurization plant, is blown for absorbing flue gas heat
Preheating, while condensate in recovered flue gas.
Further, First air heating subsystem includes high-temperature flue gas heat exchanger, First air heater；High-temperature flue gas exchanges heat
Device is arranged on gas bypass, and First air heater is arranged on primary air duct.
Further, the heat exchanger tube in high-temperature flue gas heat exchanger is divided into tetra- sections of G1, G2, G3, G4 arrangement, from First air plus
The recirculated water of hot device pressurizes through medium temperature circulating pump, First air heater is returned to after G1, G3 section successively, from unit feed pump
Mixed after feedwater G2, G4 section heat absorption of outlet with main feedwater, into boiler economizer.
Further, warm wind subsystem includes low-temperature flue gas heat exchanger, steam air heater；Low-temperature flue gas heat exchanger is arranged on flue gas
Pipeline, steam air heater are arranged on main air supply pipeline.
Further, the heat exchanger tube in low-temperature flue gas heat exchanger is divided into tetra- sections of arrangements of D1, D2, D3, D4, from steam air heater
Recirculated water pressurizes through low-temperature circulating pump, returns to steam air heater after D1, D3 section successively, from Set Low Pressure Heater outlet
Feedwater mixes after the heat absorption of D2, D4 section with main condensate, into unit oxygen-eliminating device.
Further, the pre- thermal sub-system of cold wind includes neat stress heat exchanger, cold air heaters；Neat stress heat exchanger is arranged on
Flue, cold air heaters are arranged on main air supply pipeline.
Further, neat stress heat exchanger uses condensate indirect heat exchange, and the water in boiler desulfurization equipment exiting flue gas steams
Vapour is condensed in neat stress heat exchanger, and water tank electric power supply plant is entered after condensate pump pressurizes and is used；Cold air heaters carry out foreheater
The air-supply of stove.
Further, boiler smoke after SCR denitration device, be divided into two-way before air preheater, 60-80% flue gas enters
Enter boiler air preheater, 20-40% flue gas passes through high-temperature flue gas heat exchanger through gas bypass.
The utility model has the advantages that it will be apparent that it is mainly manifested in：
Using the utility model certain 660MW units coa consumption rate can be made to decline 7.0g/kWh, reclaim water 30-50t/h, have
Larger energy-saving benefit and social benefit.
Brief description of the drawings
Fig. 1 heat of smoke discharged from boiler of power station deep exploitation and water reclamation system.
Wherein, 1 high-temperature flue gas heat exchanger, 2 First air heaters, 3 low-temperature flue gas heat exchangers, 4 steam air heaters, 5 net cigarettes
Gas heat exchanger, 6 cold air heaters, 7 medium temperature circulating pumps, 8 low-temperature circulating pumps, 9 SAPMAC method pumps, 10 condensate pumps, 11 province's coals
Device, the outlet of 12 SCR denitration devices, 13 First airs, 14 feedwater pump discharges, 15 Secondary Airs, the outlet of 16 air preheaters, 17 deoxygenations
Device, 18 condensates, 19 ESP electric dust-removing equipments, the outlet of 20 FGD desulphurization plants, 21 air-supplies, 22 chimneys, 23 water tanks.
Embodiment
Hereinafter, with reference to the accompanying drawings to describing embodiment of the present utility model in detail.
As shown in figure 1, heat of smoke discharged from boiler of power station deep exploitation and water reclamation system by high-temperature flue gas heat exchanger 1, once
Wind heater 2, low-temperature flue gas heat exchanger 3, steam air heater 4, neat stress heat exchanger 5, cold air heaters 6, and medium temperature circulating pump 7,
Low-temperature circulating pump 8, SAPMAC method pump 9 and condensate pump 10 form；
After SCR denitration device, gas bypass is set, gas bypass changes provided with high-temperature flue gas before boiler air preheater
Hot device 1；The flue that gas bypass after high-temperature flue gas heat exchanger 1 exports with boiler air preheater converges；Wherein, boiler smoke
It is divided into two strands after SCR denitration device, a portion 60-80% flue gas enters boiler air preheater, another part 20-
Heat the recirculated water of feedwater and First air heater 2 after 40% flue gas extraction boiler respectively by high temperature flue gas heat-exchange unit 1；
The flue of boiler air preheater outlet connects ESP electric dust-removing equipments by low-temperature flue gas heat exchanger 3；FGD desulphurization plants
Exhaust pass connects chimney through neat stress heat exchanger 3；Air supply pipeline connects steam air heater 4 after cold air heaters 6, by warm wind
It is divided into primary air duct and Secondary Air pipeline after device 4；Primary air duct connects coal pulverizer after First air heater 2；Two
Secondary air pipe line is connected to boiler air preheater.All air-supply is first heated boiler in cold air heaters 6, after steam air heater 4
It is divided into two strands, First air delivers to coal pulverizer after First air heater 2, and Secondary Air still enters air preheater；
Heat exchanger tube in high-temperature flue gas heat exchanger 1 is divided into tetra- sections of arrangements of G1, G2, G3, G4, from First air heater 2
Circulation heat medium water pressurizes through medium temperature circulating pump 7, First air heater is returned to after G1, G3 section successively, from unit feed pump
The feedwater of outlet mixes, into boiler economizer after the heat absorption of G2, G4 section with main feedwater；
Heat exchanger tube in low-temperature flue gas heat exchanger 2 is divided into tetra- sections of arrangements of D1, D2, D3, D4, the cycling hot from steam air heater 4
Matchmaker's water pressurizes through low-temperature circulating pump 8, returns to steam air heater 4 after D1, D3 section successively, from Set Low Pressure Heater outlet
Feedwater mixes with main condensate after the heat absorption of D2, D4 section, into unit oxygen-eliminating device；
Boiler FGD desulphurization plants exiting flue gas enters neat stress heat exchanger 5, by the way of condensate indirect heat exchange, follows
Ring heat medium water is through the pressurized circulation of SAPMAC method pump 9, the air-supply of heating boiler in cold air heaters 6；
Water vapour in boiler FGD desulphurization plant exiting flue gas condenses in neat stress heat exchanger 5, is pressurizeed through condensate pump 10
Enter water tank electric power supply plant afterwards to use.
By the system, First air, Secondary Air are shunted, only Secondary Air enters air preheater, and First air is by external one
Secondary wind heater is directly heated to required temperature；Air first passes through a cold wind heat exchanger before entering steam air heater, by desulfurizing tower
Exiting flue gas is heated by condensate to it.
Within the system, because the air for entering air preheater only has Secondary Air, its flow is reduced, therefore is being ensured necessarily
Flue gas flow needed under secondary air temperature is also reduced therewith, can increase considerably bypass flue gas flow；Bypass the waste heat of flue gas
Most of to be used for heating feedwater, fraction heats First air by way of recirculated water cools down indirectly, improves institute's recovery waste heat
Grade.
Flow through the bypass flue gas of high-temperature flue gas heat exchanger 1 and after air preheater exiting flue gas converges, exchanged heat into low-temperature flue gas
Device 3, the heat of flue gas are largely used to heat cold wind (including First air and Secondary Air), unnecessary heat be recycled in
Low-pressure heater system.
Cold wind is first heated before steam air heater 3 is entered in cold air heaters 6, the cigarette that its heat exports from desulfurizing tower
Gas.Because desulfurizing tower exit gas temperature is typically at 60 DEG C or so, wherein containing substantial amounts of water vapour, wet flue gas changes in neat stress
The coefficient of heat transfer in hot device 5 can reach 200J/ (m2K), it is 4-5 times of the coefficient of heat transfer of dry flue gas；Wet flue gas is in cooled cooling
When part water recovery therein be water, after neat stress exchanger base collects by condensate pump collect be sent to water tank.Due to
The heat that wet flue gas includes is very big, even if environment temperature is relatively low, the outlet air temperatures of cold air heaters can also control compared with
High numerical value, this aspect compensate for heating First air, the deficiency of Secondary Air heat, the opposing party after fume afterheat is largely utilized
Face also can guarantee that the cold wind temperature into steam air heater under relatively low environment temperature or operating load, prevent the corrosion of equipment.
By above-mentioned measure, the system can be achieved in depth recovery boiler smoke discharging residual heat and while efficiently utilized
The Water Sproading of wet flue gas.Compared with prior art, advantage is as follows：
(1) energy-saving effect is big.Certain 660MW supercritical unit is calculated and shown, the program can decline the coa consumption rate of unit
7.0g/kWh；
(2) recovery of water can be realized while energy-conservation.Above-mentioned unit is calculated and shown, it is 30-50t/ that it, which reclaims water,
H, and environment temperature is lower, recovery water is bigger；
(3) it is good to the adaptability of load and environment temperature.Compared with existing system, the system is in unit operation load or ring
Border temperature declines time energy and is basically unchanged, and substantially increases the heat-economy of residual neat recovering system；
(4) investment payback time is short.
It can be not only used for new-built unit, it can also be used to existing Transformation of Unit, have broad application prospects.
Finally it should be noted that：Explanation of the present utility model is the foregoing is only, is not limited to the utility model, to the greatest extent
The utility model is described in detail pipe, and for those skilled in the art, it can still be remembered to foregoing
The technical scheme of load is modified, or carries out equivalent substitution to which part technical characteristic.It is all in spirit of the present utility model
Within principle, any modification, equivalent substitution and improvements made etc., it should be included within the scope of protection of the utility model.
Claims (8)
1. a kind of heat of smoke discharged from boiler of power station deep exploitation and water reclamation system, including First air heating subsystem, warm wind subsystem
System, the pre- thermal sub-system of cold wind, set gas bypass, after boiler air preheater after denitrification apparatus, before boiler air preheater
Flue is converged to, First air heating subsystem is arranged at gas bypass；Characterized in that, boiler main air supply pipeline passes through successively
Cold wind preheating subsystem and warm wind subsystem are crossed, primary air duct and Secondary Air pipeline are divided into after warm wind subsystem；First air
Pipeline heats First air by First air heating subsystem using flue gas heat in gas bypass；Secondary Air pipeline is connected to pot
Stove air preheater；Warm wind subsystem be arranged on boiler air preheater after, the flue before electric dust-removing equipment, for absorbing flue gas heat
Heat cold wind；The pre- thermal sub-system of cold wind is arranged on the flue after desulphurization plant, for absorb flue gas heat blow it is pre-
Heat, while condensate in recovered flue gas.
2. heat of smoke discharged from boiler of power station deep exploitation as claimed in claim 1 and water reclamation system, it is characterised in that First air
Heating subsystem includes high-temperature flue gas heat exchanger, First air heater；High-temperature flue gas heat exchanger is arranged on gas bypass, First air
Heater is arranged on primary air duct.
3. heat of smoke discharged from boiler of power station deep exploitation as claimed in claim 2 and water reclamation system, it is characterised in that high temperature cigarette
Heat exchanger tube in gas heat exchanger is divided into tetra- sections of arrangements of G1, G2, G3, G4, and the recirculated water from First air heater circulates through medium temperature
Pump pressurizes, and returns to First air heater after G1, G3 section successively, and the feedwater from unit feedwater pump discharge is through G2, G4 section
Mixed after heat absorption with main feedwater, into boiler economizer.
4. heat of smoke discharged from boiler of power station deep exploitation as claimed in claim 1 and water reclamation system, it is characterised in that warm wind
System includes low-temperature flue gas heat exchanger, steam air heater；Low-temperature flue gas heat exchanger is arranged on flue, and steam air heater is arranged on main air-supply
Pipeline.
5. heat of smoke discharged from boiler of power station deep exploitation as claimed in claim 4 and water reclamation system, it is characterised in that low temperature cigarette
Heat exchanger tube in gas heat exchanger is divided into tetra- sections of arrangements of D1, D2, D3, D4, and the recirculated water from steam air heater pressurizes through low-temperature circulating pump,
Steam air heater is returned after D1, D3 section successively, from Set Low Pressure Heater outlet feedwater through D2, D4 section heat absorption after with
Main condensate mixes, into unit oxygen-eliminating device.
6. heat of smoke discharged from boiler of power station deep exploitation as claimed in claim 1 and water reclamation system, it is characterised in that cold wind is pre-
Thermal sub-system includes neat stress heat exchanger, cold air heaters；Neat stress heat exchanger is arranged on flue, and cold air heaters are set
In main air supply pipeline.
7. heat of smoke discharged from boiler of power station deep exploitation as claimed in claim 6 and water reclamation system, it is characterised in that neat stress
Heat exchanger uses condensate indirect heat exchange, and the water vapour in boiler desulfurization equipment exiting flue gas condenses in neat stress heat exchanger,
Enter water tank electric power supply plant after condensate pump pressurizes to use；Cold air heaters carry out the air-supply of preboiler.
8. heat of smoke discharged from boiler of power station deep exploitation as claimed in claim 1 and water reclamation system, it is characterised in that boiler smoke
Gas is after SCR denitration device, is divided into two-way before air preheater, and 60-80% flue gas enters boiler air preheater, 20-40%'s
Flue gas passes through high-temperature flue gas heat exchanger through gas bypass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720646110.4U CN207006112U (en) | 2017-05-22 | 2017-05-22 | A kind of heat of smoke discharged from boiler of power station deep exploitation and water reclamation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720646110.4U CN207006112U (en) | 2017-05-22 | 2017-05-22 | A kind of heat of smoke discharged from boiler of power station deep exploitation and water reclamation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207006112U true CN207006112U (en) | 2018-02-13 |
Family
ID=61446113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720646110.4U Active CN207006112U (en) | 2017-05-22 | 2017-05-22 | A kind of heat of smoke discharged from boiler of power station deep exploitation and water reclamation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207006112U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107202318A (en) * | 2017-05-22 | 2017-09-26 | 大唐(北京)能源管理有限公司 | A kind of heat of smoke discharged from boiler of power station deep exploitation and water reclamation system |
-
2017
- 2017-05-22 CN CN201720646110.4U patent/CN207006112U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107202318A (en) * | 2017-05-22 | 2017-09-26 | 大唐(北京)能源管理有限公司 | A kind of heat of smoke discharged from boiler of power station deep exploitation and water reclamation system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106090880B (en) | A kind of machine stove set heat circulation afterheat recycling system | |
| CN102759096B (en) | Smoke waste heat utilization system | |
| CN107120714B (en) | A kind of whole yearization comprehensive utilization energy conserving system | |
| CN103225834B (en) | Boiler smoke blowdown heat pump of recovering residual heat heating system and using method thereof | |
| CN105889897B (en) | A kind of thermal power plant residual heat integrative recycling system and method | |
| CN104566424B (en) | A kind of combined steam flue gas MGGH systems and flue gas treating process | |
| CN106500122A (en) | A kind of elimination coal fired power plant chimney white haze is while the system and method for Mist heat recovering and water | |
| CN104266171A (en) | Flue gas waste heat utilization system of thermal power plant | |
| CN102242946A (en) | Concentrated heat supply system for reclaiming smoke afterheat by absorption heat pump | |
| CN101900347A (en) | System for high-grade recycling waste heat of smoke discharged from boiler of power station | |
| CN109798534A (en) | A kind of residual heat from boiler fume utilizes and takes off white integral system | |
| CN107178814A (en) | A kind of thermal power plant boiler fume afterheat is used for the energy conserving system of central heating | |
| CN107202318A (en) | A kind of heat of smoke discharged from boiler of power station deep exploitation and water reclamation system | |
| CN109668165A (en) | Hot Secondary Air and smoke waste heat utilization system and thermal power generation unit | |
| CN204100225U (en) | Coal steam-electric plant smoke bootstrap system | |
| CN109737446A (en) | A kind of recycling of power plant boiler smoke discharging residual heat and flue gas disappear white system | |
| CN108443906A (en) | Smoke waste heat utilization system and method based on multiple level with recycling heating cold wind | |
| CN105402761A (en) | Deep coupling utilization system for turbine steam exhaust waste heat and boiler flue gas waste heat | |
| CN102839999B (en) | Small steam turbine exhaust steam cold source loss recovery system and method | |
| CN204478113U (en) | A kind of combined steam flue gas MGGH system | |
| CN106322427A (en) | Deslagging waste heat utilization system and deslagging waste heat utilization method for circulating fluidized bed boiler | |
| CN205332168U (en) | Waste heat comprehensive recovery utilization system of thermal power factory | |
| CN205245217U (en) | System is utilized to steam turbine exhaust steam waste heat coupling waste heat of boiler flue gas degree of depth | |
| CN203489244U (en) | Boiler smoke waste-heat applicable system | |
| CN205592967U (en) | A waste heat power generation system for dangerous waste disposal trade of industry |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |