CN206626596U - Meet the afterheat utilizing system of the flue gas cool-down of low temperature electric dust removal requirement - Google Patents
Meet the afterheat utilizing system of the flue gas cool-down of low temperature electric dust removal requirement Download PDFInfo
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- CN206626596U CN206626596U CN201720171237.5U CN201720171237U CN206626596U CN 206626596 U CN206626596 U CN 206626596U CN 201720171237 U CN201720171237 U CN 201720171237U CN 206626596 U CN206626596 U CN 206626596U
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- pressure heater
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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
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Abstract
It the utility model is related to a kind of afterheat utilizing system for the flue gas cool-down for meeting low temperature electric dust removal requirement, water side recirculating system is configured with including gas cooler, one-level low-pressure heater, two level low-pressure heater, condensation water supply system and corresponding adjusting switch, gas cooler；Water supply system is condensed to be connected with one-level low-pressure heater；One-level low-pressure heater connects two level low-pressure heater, one-level low-pressure heater outlet connection gas cooler import, gas cooler import is also connected with the import of one-level low-pressure heater or circulation frequency conversion pump discharge, the outlet of frequency conversion pump inlet connection gas cooler is circulated, two level low-pressure heater import or export connects with gas cooler outlet.The system mainly meets requirement of the low temperature electric precipitation to entrance flue gas temperature（It is controllable）, while the heat recovery in flue gas is converted into the heat of steam turbine condensate, the low-pressure heater steam consumption in Steam Turbine Regenerative System is effectively reduced, has saved the substantial amounts of energy.
Description
Technical field
A kind of flue gas cool-down afterheat utilizing system is the utility model is related to, it is especially a kind of to install cigarette additional in front flue of dust collector
Gas Cooler device.
Background technology
In order to reach requirement of the low temperature electric cleaner to inlet flue gas temperature, often flue gas is set to cool down in deduster gas approach
Device device.The flue-gas temperature of air preheater outlet is adjusted using steam turbine condensate to meet the requirement of low temperature electric cleaner, together
When the amount of drawing gas of steam turbine, in the case where Fuel Consumption is constant, Steam Turbine condensate and then reduced due to flue gas
Electrical power can be obtained more, improve the economy of unit.
Technology mainly adjusts the condensing water flow into gas cooler to adjust gas cooler outlet cigarette temperature, cigarette at present
Gas Cooler inlet water temperature is generally fixed to certain numerical value, and gas cooler is typically using summer limiting condition as design conditions,
If inlet water temperature is in the case where ensureing that low-temperature corrosion does not occur for gas cooler, inlet water temperature relative reduction can reduce flue gas
The heat exchange area of design of heat exchanger；In addition, in underload, entrance condensing water temperature is relatively low, it may occur that heat exchanger cold end low temperature
Corrosion phenomenon, influence the service life of heat-exchange system.And prior art is mainly by gas cooler serial or parallel connection into system,
The rich exchange capability of heat of underload section can not be utilized, increases the energy-saving benefit of whole system.
The content of the invention
For the utility model in order to solve above mentioned problem, meet low temperature electric precipitation inlet flue gas temperature under full load will
Ask, and a kind of afterheat utilizing system for the flue gas cool-down for meeting low temperature electric dust removal requirement is provided, entered by changing gas cooler
The mode of outlet access condensate system, ensures that the flue-gas temperature into before deduster is controllable.
To achieve the above object, the technical solution of the utility model is：A kind of flue gas drop for meeting low temperature electric dust removal requirement
The afterheat utilizing system of temperature, including gas cooler, one-level low-pressure heater, two level low-pressure heater, condensation water supply system
And corresponding adjusting switch, the gas cooler are configured with water side recirculating system；The condensation water supply system and one-level
Low-pressure heater connects；One-level low-pressure heater connects two level low-pressure heater, the one-level low-pressure heater outlet connection cigarette
Gas Cooler import, the gas cooler import are also connected with the import of one-level low-pressure heater or circulation frequency conversion pump discharge, circulation
The outlet of frequency conversion pump inlet connection gas cooler, the two level low-pressure heater import or export connect with gas cooler outlet
Connect.
The gas cooler import includes three branch roads:One-level low-pressure heater import branch road, one-level low-pressure heater
Export branch road and cooler outlet recirculation strand.
The gas cooler outlet includes three branch roads：Two level low-pressure heater import branch road, two level low-pressure heater
Export branch road and recirculation strand.
The gas cooler with adjusting switch is provided between the one-level low-pressure heater and two level low-pressure heater
Bypass conduit, for adjusting the flow into gas cooler condensate.
The one-level low-pressure heater export branch road is gas cooler entrance main condensate pipeline；When unit operation is in height
During load, the gas cooler connects one-level low-pressure heater import branch road, for being extracted from the import of one-level low-pressure heater
Cooling water reduces gas cooler inlet water temperature；When unit operation load is low, the gas cooler connection recycling branch
Road, for improving gas cooler inlet water temperature.
When gas cooler outlet condensing water temperature is less than two level low-pressure heater outlet condensing water temperature, the flue gas
Cooler outlet connects two level low-pressure heater import branch road；When gas cooler outlet, condensing water temperature adds higher than two level low pressure
During hot device outlet condensing water temperature, the gas cooler outlet is connected in parallel two level low-pressure heater import branch road and two level is low
Press heater outlet branch road；Wherein, the 6th branch road control valve is connected on two level low-pressure heater import branch road, two level low pressure adds
The 7th branch switch valve and the 7th branch road control valve are connected in hot device export branch road.
The beneficial effects of the utility model are：
The utility model accesses the mode of condensate system by under different load, changing gas cooler inlet and outlet,
So as to meet that electric cleaner entrance flue gas temperature is controllable (85 DEG C~95 DEG C) under full load.This residual heat using device,
Mainly meet requirement (controllable) of the low temperature electric precipitation to entrance flue gas temperature, while the heat recovery in flue gas is converted
For the heat of steam turbine condensate, the low-pressure heater steam consumption in Steam Turbine Regenerative System is effectively reduced, is saved
The substantial amounts of energy.
Unit is under full load mode, by way of changing gas cooler and importing and exporting access system, ensures to enter and removes
Flue-gas temperature before dirt device is controllable.Wherein more it is significantly, in unit running on the lower load, to be come out from flue gas cooling water
Condensate be directly incorporated into two level low-pressure heater export pipeline, rather than be incorporated to two level low-pressure heater entrance pipe, so
The energy-saving benefit of smoke waste heat utilization system can be preferably improved while meeting that cigarette temperature requires.
Brief description of the drawings
Fig. 1 is the schematic diagram of gas cooler system of the present utility model；
Fig. 2 is the schematic diagram of smoke waste heat utilization system.
Embodiment
The utility model is further elaborated below by concrete application embodiment and with reference to accompanying drawing.
As shown in figure 1, gas cooler system of the present utility model, including gas cooler 300, one-level low-pressure heater
100th, two level low-pressure heater 200, condensation water supply system, recirculation pump 400, tie point 610, the second branch road the 620, the 3rd
Branch road 630, the 4th branch road 640, the 5th branch road 650, the 6th branch road 660, the 7th branch road 670, the 8th branch road 680, tie point
Control valve 501, the second branch road control valve 502, the 3rd branch switch valve 503, the 8th branch road control valve the 504, the 6th
Branch switch valve 505, the 6th branch road control valve 506, the 7th branch switch valve 507, the 7th branch road control valve 508 with
And control system etc..
Gas cooler 300 is configured with water side recirculating system；The condensation water supply system and one-level low-pressure heater
100 connections；One-level low-pressure heater 100 connects two level low-pressure heater 200, the outlet of one-level low-pressure heater 100 connection
The import of gas cooler 300, the import of gas cooler 300 are also connected with the import of one-level low-pressure heater 100 or circulation frequency conversion
Pump 400 exports, and circulation variable frequency pump 400 import connection gas cooler 300 exports, the import of two level low-pressure heater 200 or
Outlet connects with the outlet of gas cooler 300.
The import of gas cooler 300 is mainly made up of three tunnels：Tie point 610, the second branch road 620, the 3rd branch road 630.
Second branch road 620 is gas cooler entrance main condensate pipeline；Tie point 610 is mainly used in working as gas cooler entrance cigarette
Temperature degree is higher, it is necessary to reduce condensate inlet temperature so that cigarette temperature disclosure satisfy that the requirement of low temperature electric precipitation inlet flue gas temperature, and
Adjusted from the water of the import of one-level low-pressure heater 100 by tie point control valve 501 and mixed with the second branch road condensate,
To obtain the water temperature for meeting to require；If the technical program is using summer limiting condition as design conditions, now gas cooler entrance
Cigarette temperature is higher than 140 DEG C, in order that gas cooler outlet cigarette temperature is reduced to the requirement of low temperature electric precipitation transformation inlet flue gas temperature, needs
A certain amount of cooling water is extracted from tie point 610 reduces the inlet water temperature of gas cooler.3rd branch road 630 is main
For when gas cooler inlet water temperature it is relatively low, if being directly entered gas cooler, gas cooler low-temperature corrosion can be caused,
Therefore extract a certain amount of condensate from gas cooler outlet and be used to heat the condensate of the second branch road 620, raising enters flue gas and cooled down
Device entrance condensate water temperature；Such as in real work, when unit 40%THA operating modes are run, the outlet of one-level low-pressure heater is solidifying
Bear water temperature and there was only 60 DEG C or so, and the dew-point temperature of water is 45 DEG C, usually requires that the condensation water temperature into gas cooler 300
Degree is run for 20 DEG C higher than aqueous dew point temperature, i.e. the inlet water temperature of gas cooler 300 is higher than 65 DEG C, in order to prevent low-temperature corrosion,
Now need from gas cooler outlet recycling to improve the inlet water temperature of gas cooler, resistance is by condensate recirculation pump
Overcome.
The flow of 3rd branch road 630 is mainly controlled by recycling variable frequency pump 400.3rd branch road 630 can be to flue gas
Cooler plays a part of traffic protection, gas cooler condensing water flow 1400t/h or so such as under design conditions, and low
During load, gas cooler condensing water flow only has 130t/h when not putting into recycling, can now there is gas cooler inner tube
Mass flow discrepancy is even in beam, or even some tube banks are in not circulation status, so as to influence the uniform of gas cooler flue gas flow field
Property.
The branch road 630 of tie point 610 and the 3rd can not put into operation simultaneously.
Gas cooler outlet main line 650 is divided into the 6th branch road 660 and the two-way of the 7th branch road 670；
When gas cooler outlet condensing water temperature is less than two level low-pressure heater outlet condensing water temperature, now put into
6th branch road, wherein the 6th branch road control valve 506 is used to control gas cooler to export condensate line (the 5th branch road 650
And the 6th branch road 660) resistance to water-flow flow, so as to control the condensing capacity by the gas cooler 300, with further
The flue-gas temperature in the exit of the gas cooler 300 is controlled, to meet the requirement of low temperature electric precipitation inlet flue gas temperature, and
Ensure the good heat-economy of unit.
When gas cooler outlet condensing water temperature is higher than two level low-pressure heater outlet condensing water temperature, in order to improve
The economy of unit, the 6th branch road is now progressively turned down, the 7th branch road is put into, wherein adjusting switch 508 is used on the 7th branch road
The resistance to water-flow flow of gas cooler outlet condensate line (the 5th branch road 650 and the 7th branch road 670) is controlled, so as to control
By the condensing capacity of the gas cooler 300, further to control the flue gas temperature in the exit of the gas cooler 300
Degree, to meet the requirement of low temperature electric precipitation inlet flue gas temperature
8th branch road control valve 504 is combined with adjusting switch on the export pipeline of gas cooler 300 for controlling flue gas
The flow of cooler 300 is so as to ensureing the stabilization of the outlet temperature of flue gas.
Specific implementation is：
In order that unit can disclosure satisfy that the input condition of low temperature electric precipitation under full load mode, this programme is with the summer
Season, limiting condition was design conditions, while in order to obtain the economic benefit of maximum using gas cooler series/parallel in heating power system
The mode of system, gas cooler import by the way of cooling water is extracted or outlet condensate recycling mode change into cigarette
The condensing water temperature of Gas Cooler, higher entrance flue gas temperature can be reduced to the demand temperature of cold precipitator.
When unit operation is in higher load, gas cooler import cigarette temperature is higher, now by from one-level low-pressure heating
Device, which extracts certain cooling water, reduces gas cooler inlet water temperature, gas cooler can be exported into cigarette temperature and be reduced to demand temperature
Degree.
When unit operation operating mode off-design operating mode is larger (when unit load is relatively low), gas cooler entrance condensate
Temperature is relatively low, gas cooler can be caused to corrode, now by the way of partial fume cooler outlet condensate is recycled,
To improve gas cooler inlet water temperature, while in underload, gas cooler inlet flue gas temperature it is relatively low, it is necessary to flue gas cooling
Device condensing water flow is reduced, and being dropped in for recirculating line adds somewhat to flue gas heat-exchange unit condensing water flow, and this is right
Certain traffic protection effect is played in gas cooler, i.e., gas cooler minimum flow cannot be below the certain of maximum stream flow
Ratio, if condensing water flow is very few in gas cooler, the uniformity of flue gas flow field can be influenceed to a certain extent；
When unit operation operating mode off-design operating mode is larger (when unit load is relatively low), now gas cooler goes out saliva
Temperature may already exceed the exit water temperature for the low-pressure heater to be incorporated to, and in order to obtain more preferable economic benefit, can now select
Select the entrance of the low-pressure heater of gas cooler port of export connection higher level.I.e. now gas cooler uses parallel connection
Mode is incorporated to system.
Gas cooler condensing water flow is mainly realized by the joint debugging of bypass valve and index combustion fan.Using reality
Apply example：
A kind of afterheat utilizing system for the flue gas cool-down for meeting low temperature electric dust removal requirement, with overcritical 630MW direct current cookers
Exemplified by be introduced：
First, by taking the overcritical 630MW direct current cookers of certain power plant as an example, boiler is super the facing of Shanghai Furnace Factory Co., Ltd's production
Boundary's parameter variable-pressure operation spirally-wound tubes Once-through Boiler is single burner hearth, a resuperheat, logical using Terms of Corner Tangential Combustion, balance
Wind, dry ash extraction, all steel overhung construction Π types, outdoor cloth placed fire coal boiler.Model SG1913/25.4-M967.Its is main
Parameter is as follows：
The coal-fired acid dew-point temperature of the boiler design is 80.4 DEG C, and SCR amendment acid dew-point temperatures are 86.17 DEG C, in order to anti-
Only low-temperature corrosion, the entrance flue gas temperature of the unit low temperature electric cleaner is set as 87 DEG C.
2nd, the form of implementation of smoke waste heat utilization system
Smoke waste heat utilization system as shown in Figure 2, gas cooler the import and export pipeline input condition are as follows：
1) cold section (I) puts into condition：
Under summer limiting condition, air preheater exit gas temperature is higher (even more than TRL operating condition designs parameter), to protect
Card deduster entrance flue gas temperature can be reduced to 87 DEG C, need to reduce gas cooler inlet water temperature, and now cold section of (I) road is thrown
Enter, plus outlet condensate low with No. 7 mixes, while to prevent heat exchanger low-temperature corrosion, sets mixing rear entrance temperature as 65 DEG C.This
When condensate full flow pass through gas cooler；
Under THA~75%THA operating modes, when No. 7 low plus outlet temperatures are more than 70 DEG C, cold section (I) is put into, to reduce flue gas
Cooler inlet water temperature.The thermal discharge needed according to gas cooler, adjustment bypass (III) flow and V roads control valve opening；
2) recirculation line (IV) input condition:
Under 75%THA~50%THA operating modes, No. 7 low plus outlet temperatures recirculation line (IV) input, are used less than 70 DEG C
To lift gas cooler inlet water temperature.The thermal discharge needed according to gas cooler, adjustment bypass (III) flow and V roads
Control valve opening；
3) VI pipelines input condition：
When gas cooler exit water temperature is more than, No. 6 low plus exit water temperatures, gas cooler outlet condensate no longer with side
Road (III) is mixed into No. 6 low addition mouths, but closes the total door of gas cooler outlet regulating, low by No. 6 in parallel of VI pipelines
Add, with No. 6 it is low plus outlet condensate mix after enter No. 5 it is low add；Simultaneously bypass (III) condensate be directly entered No. 6 it is low plus.Root
The thermal discharge needed according to gas cooler, adjustment bypass (III) flow and VI roads control valve opening；
3rd, effect after a kind of smoke waste heat utilization system in embodiment of the present utility model is implemented
Table：Smoke waste heat utilization system implementation result table
As can be seen from the above table, in 50%THA loads, gas cooler condensation water out is incorporated to No. 6 low plus outlets
Low add mouthful coal consumption than being incorporated to No. 6 and reduce an increase about 0.41g/kWh.
Above said content is only the basic explanation under the utility model design, and according to the technical solution of the utility model
Any equivalent transformation done, all should belong to the scope of protection of the utility model.
Claims (6)
1. a kind of afterheat utilizing system for the flue gas cool-down for meeting low temperature electric dust removal requirement, including gas cooler (300), one-level
Low-pressure heater (100), two level low-pressure heater (200), condensation water supply system and corresponding adjusting switch, its feature exist
In：The gas cooler (300) is configured with water side recirculating system；The condensation water supply system and one-level low-pressure heater
(100) connect；One-level low-pressure heater (100) connection two level low-pressure heater (200), the one-level low-pressure heater (100)
Outlet connection gas cooler (300) import, gas cooler (300) import are also connected with one-level low-pressure heater (100)
Import or circulation variable frequency pump (400) outlet, circulation variable frequency pump (400) import connection gas cooler (300) outlet, the two level
Low-pressure heater (200) import or export connects with gas cooler (300) outlet.
2. the afterheat utilizing system of the flue gas cool-down according to claim 1 for meeting low temperature electric dust removal requirement, its feature exist
In：Gas cooler (300) import includes three branch roads:One-level low-pressure heater import branch road, one-level low-pressure heater
Export branch road and cooler outlet recirculation strand.
3. the afterheat utilizing system of the flue gas cool-down according to claim 1 for meeting low temperature electric dust removal requirement, its feature exist
In：Gas cooler (300) outlet includes three branch roads：Two level low-pressure heater import branch road, two level low-pressure heater
Export branch road and recirculation strand.
4. the afterheat utilizing system of the flue gas cool-down according to claim 1 for meeting low temperature electric dust removal requirement, its feature exist
In：The flue gas with adjusting switch is provided between the one-level low-pressure heater (100) and two level low-pressure heater (200) to cool down
The bypass conduit of device, for adjusting the flow into gas cooler condensate.
5. the afterheat utilizing system of the flue gas cool-down according to claim 2 for meeting low temperature electric dust removal requirement, its feature exist
In the one-level low-pressure heater export branch road is gas cooler entrance main condensate pipeline；
When unit operation is in high load capacity, the gas cooler (300) connects one-level low-pressure heater import branch road, for from
One-level low-pressure heater (100) import extracts cooling water to reduce gas cooler inlet water temperature；When unit operation load is low,
The gas cooler (300) connects recirculation strand, for improving gas cooler inlet water temperature.
6. the afterheat utilizing system of the flue gas cool-down according to claim 3 for meeting low temperature electric dust removal requirement, its feature exist
In：When gas cooler (300) outlet condensing water temperature is less than two level low-pressure heater (200) outlet condensing water temperature, institute
State gas cooler (300) outlet connection two level low-pressure heater import branch road；When gas cooler outlet, condensing water temperature is high
When two level low-pressure heater exports condensing water temperature, gas cooler (300) outlet is connected in parallel two level low-pressure heating
Device import branch road and two level low-pressure heater export branch road；Wherein, it is connected to the 6th branch road on two level low-pressure heater import branch road
Control valve (506), the 7th branch switch valve (507) is connected in two level low-pressure heater export branch road and the 7th branch road is adjusted
Save valve (508).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720171237.5U CN206626596U (en) | 2017-02-24 | 2017-02-24 | Meet the afterheat utilizing system of the flue gas cool-down of low temperature electric dust removal requirement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720171237.5U CN206626596U (en) | 2017-02-24 | 2017-02-24 | Meet the afterheat utilizing system of the flue gas cool-down of low temperature electric dust removal requirement |
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| Publication Number | Publication Date |
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| CN206626596U true CN206626596U (en) | 2017-11-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112923390B (en) * | 2021-02-26 | 2022-11-22 | 华北电力科学研究院有限责任公司 | Parallel flue gas waste heat system and method |
-
2017
- 2017-02-24 CN CN201720171237.5U patent/CN206626596U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112923390B (en) * | 2021-02-26 | 2022-11-22 | 华北电力科学研究院有限责任公司 | Parallel flue gas waste heat system and method |
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