CN208205050U - A kind of smoke multistage drying brown coal electricity generation system - Google Patents
A kind of smoke multistage drying brown coal electricity generation system Download PDFInfo
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- CN208205050U CN208205050U CN201820491227.4U CN201820491227U CN208205050U CN 208205050 U CN208205050 U CN 208205050U CN 201820491227 U CN201820491227 U CN 201820491227U CN 208205050 U CN208205050 U CN 208205050U
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
A kind of smoke multistage drying brown coal electricity generation system, lignite are sent into boiler after passing through smoke multistage drying system；Smoke multistage drying system includes the first order drying machine and second level drying machine being sequentially connected in series；Desulfurizing tower exhanst gas outlet is connected by flue gas pipeline with the smoke inlet of gas cooler, and first order drying machine and gas cooler are interconnected to constitute enclosed soft circulation circuit, and it is dry to carry out the first order to lignite using low-temperature flue gas waste heat；Second level drying machine smoke inlet takes out mouth with boiler smoke and is connected, and extraction section high temperature flue-gas from boiler carries out depth drying to lignite；It realizes and predrying is carried out to lignite using coal fired generation process, and then increase substantially lignite generating efficiency.
Description
Technical field
The utility model belongs to coal-fired thermal power generation system field, is related to a kind of heat power plant boiler stokehold lignite or cigarette
Coal drying and dehydrating system.
Background technique
Lignite is a kind of low-disintegration coal, is a kind of colm, has the characteristics that high-moisture, low heat value.Currently, most of
In lignite power station, moisture is up to 30%~50% lignite without predrying, but directly extracts with burner hearth in coal pulverizer
High-temperature flue gas contact it is dry to achieve the purpose that, dry used flue gas and the dry vapor generated are sent together with coal dust
Enter burner hearth, fire box temperature is caused to reduce, combustion stability is deteriorated, and exhaust gas volumn increases, and furnace cross-sectional area and volume increase accordingly, pot
The manufacture of furnace and mounting cost increase.Meanwhile heat loss due to exhaust gas increases, boiler thermal efficiency reduces, so that the power generation of power plant
Efficiency reduces.Conventional lignite power station has the shortcomings that invest larger, low efficiency.
In lignite power station, using pre-dried lignite can be improved generating efficiency.But high water content brown coal predrying
Journey needs to consume a large amount of thermal energy, and individual lignite predry drying system generally requires combustion parts lignite and provides energy for drying process
Amount, it is contemplated that the consumption of this part lignite, lignite power generation whole efficiency are still lower.Presently, there are problems: 1) boiler smoke is large-minded,
Boiler volume is huge, involves great expense；2) boiler accessory machinery power output is big, and station service power consumption rate is high；3) boiler exhaust gas moisture content is high, smoke evacuation temperature
Degree is high, and boiler efficiency is low (being generally lower than 91%).Therefore, carrying out power generation how to efficiently use lignite is that China is fiery at present and in the future
The challenge that power power industry can not evade and necessarily face.
Utility model content
A kind of smoke multistage drying brown coal electricity generation system that in order to solve the above problems, the utility model proposes, lignite is first
It is dry that the first order is carried out after heat pump heats up using thermal energy after desulfurizing tower, then carries out second level drying using boiler smoking gas,
Predrying is carried out to lignite using coal fired generation process to realize, and then increases substantially lignite generating efficiency.
To achieve the above object, the utility model takes following design scheme:
A kind of smoke multistage drying brown coal electricity generation system, coal-burning boiler is by pipeline and smoke processing system and desulfurizing tower phase
Even；Low-temperature flue gas is discharged after desulfurizing tower；It is characterized in that, lignite is by being sent into boiler after smoke multistage drying system；Flue gas is more
Grade drying system includes the first order drying machine that is sequentially connected in series and second level drying machine, wherein first order drying machine coal export with
The dry machine-made egg-shaped or honey-comb coal briquets entrance in the second level is connected, and second level drying machine coal export is connected with boiler；Desulfurizing tower exhanst gas outlet passes through fume pipe
Road is connected with the smoke inlet of gas cooler, and first order drying machine is interconnected to constitute closed type hot with gas cooler and is recycled back to
It is dry to carry out the first order to lignite using low-temperature flue gas waste heat for road；Second level drying machine smoke inlet takes out mouth phase with boiler smoke
Even, extraction section high temperature flue-gas from boiler carries out depth drying to lignite.
Further, heat pump compressor is set in first order drying machine soft circulation circuit；Heat pump work in gas cooler
Matter outlet is connected by pipeline with heat pump compressor entrance, and the outlet of heat pump compressor heat pump fluid is dry by pipeline and the first order
The heat pump fluid entrance of machine is connected, and the outlet of first order drying machine heat pump fluid enters with the heat pump fluid in gas cooler by the road
Mouth is connected to constitute enclosed soft circulation circuit.
Further, first order drying machine heat pump fluid outlet is also connected with throttle valve by the road, and throttle valve passes through pipeline
It is connected with the heat pump fluid entrance in gas cooler.
Further, the boiler tail flue gas of second level drying machine smoke inlet is handed over from boiler tail superheater and economizer
It meets place to extract, flue-gas temperature is 500 DEG C~750 DEG C, and the flue gas after having exchanged heat, which is arranged, continues heat release in main air preheater, puts
Flue gas after heat is complete is arranged under the action of boiler draft machine negative pressure to fume treatment auxiliary.
Further, first order drying machine is heat pump fluid/dried medium heat exchange structure, is low-temperature zone heater, uses
Tube still heater, walks dried medium in pipe, pipe it is outer walk heat pump fluid；Second level drying machine is that heating flue gas/dried medium is changed
Heat structure is high temperature section heater, using tube still heater, dried medium is walked in pipe, pipe is outer to be walked to heat flue gas.
Further, the dry steam exhaust outlet of first order drying machine is connected with dead steam recovery system；Second level drying machine is dry
Steam exhaust outlet is connected with dead steam recovery system.
Further, lignite is dried in first order drying machine to quality moisture content 15%~25%, dry in the second level
It dries in machine to quality moisture content 5%~10%.
Further, dead steam recovery system carries out waste heat recycling and water recycling；Dead steam recovery system includes first order steam exhaust
Cooler, second level steam exhaust cooler, third level steam exhaust cooler, first order steam exhaust cooler, second level steam exhaust cooler,
Three-level steam exhaust cooler is successively linked in sequence；Steam exhaust sequentially enters three steam exhaust coolers；It is solidifying by heating Steam Turbine Regenerative System
It bears water, heating boiler air-supply, it can also be to external heat supply network heat supply.
Further, three steam exhaust coolers are provided with hydrophobic pipeline, the condensed condensate liquid warp of vapor in steam exhaust
Condensate pump is recycled to unit draining system, realizes the recycling to lignite water content.
Further, three steam exhaust coolers are provided with switching bypass, are realized using switching bypass in Various Seasonal work
Condition or equipment fault are put into operation or are cut off to each steam exhaust cooler when repairing.
On the one hand lignite moisture content declines the utility model in drying system, to reduce boiler smoke tolerance, subtract
Pannikin furnace volume reduces boiler cost and improves boiler efficiency；In addition it can use part waste heat in boiler drying process, thus
Improve the integral energy utilization efficiency of coal fired power plant；The cogeneration of heat and power of lignite power generation may be implemented in steam exhaust recycling, improves simultaneously
Boiler efficiency.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of this system.
In figure: 1 being boiler, 2 be desulfurizing tower, 3 be gas cooler, 4 be heat pump compressor, 5 be first order drying machine, 6
It is second level drying machine for throttle valve, 7
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
The utility model is described in detail below in conjunction with attached drawing, it should be understood that content described herein is only used for
Description and interpretation the utility model is not used to limit the utility model.
Boiler of power plant flue gas has the thermal energy of each temperature grade, while there is also a large amount of waste heat in boiler exhaust gas, if
The boiler smoke thermal energy of Rational choice different temperatures grade carries out predrying to lignite, can obtain significant energy-saving and emission-reduction effect
Benefit.
For realize brown coal drying, steam exhaust recycling, combustion power generation whole process energy cascade utilization, the utility model proposes
A kind of smoke multistage drying brown coal electricity generation system.The system recycles desulfurizing tower rear portion low-temperature flue gas thermal energy using heat pump principle
Brown coal drying provides a part of heat source, while extraction section high temperature flue-gas from boiler realizes the depth drying of lignite.It is adopted to realize
Predrying is carried out to lignite with coal fired generation process, and then increases substantially lignite generating efficiency.
As shown in Figure 1, coal-burning boiler (1) is connected by pipeline and smoke processing system with desulfurizing tower (2)；Desulfurizing tower (2)
After low-temperature flue gas is discharged.
Lignite passes through smoke multistage drying system first and is then sent into boiler.Smoke multistage drying system includes being sequentially connected in series
First order drying machine (5) and second level drying machine (7), wherein first order drying machine (5) coal export and second level drying machine
(7) coal entrance is connected, and second level drying machine (7) coal export is connected with boiler.
Desulfurizing tower (2) exhanst gas outlet is connected by flue gas pipeline with the smoke inlet of gas cooler (3), and the first order is dry
Machine (5) and gas cooler (3) are interconnected to constitute enclosed soft circulation circuit, carry out first to lignite using low-temperature flue gas waste heat
Grade is dry；Flue-gas temperature after desulfurizing tower (2) is lower, and heat pump compressor (4) are arranged in soft circulation circuit.Gas cooler (3)
Interior heat pump fluid outlet is connected by pipeline with heat pump compressor (4) entrance, and the outlet of heat pump compressor (4) heat pump fluid is passed through
Pipeline is connected with the heat pump fluid entrance of first order drying machine (5), first order drying machine (5) heat pump fluid outlet by the road also with
Throttle valve (6) is connected, and throttle valve (6) is connected to constitute and close with the heat pump fluid entrance in gas cooler (3) by pipeline
Formula soft circulation circuit；
First order drying machine (5) is heat pump fluid/dried medium heat exchange structure, is low-temperature zone heater, using shell and tube
Heater, walks dried medium in pipe, pipe it is outer walk heat pump fluid.
Drying machine (7) smoke inlet in the second level takes out mouth with boiler (1) flue gas and is connected；For heating flue gas/dried medium heat exchange
Structure is high temperature section heater, and using tube still heater, dried medium is walked in pipe, and pipe is outer to be walked to heat flue gas, and heating flue gas is
Boiler tail flue gas, boiler tail flue gas are extracted from boiler tail superheater and economizer junction, and flue-gas temperature is 500 DEG C~
750 DEG C, the flue gas after having exchanged heat is arranged continues heat release in main air preheater, and the flue gas after heat release is complete is negative in boiler induced-draft fan
It is arranged under the action of pressure to fume treatment auxiliary.
Lignite is dried to quality moisture content 15%~25%, in second level drying machine (7) in first order drying machine (5)
It dries to quality moisture content 5%~10%；
The dry steam exhaust outlet of first order drying machine (5) is connected with dead steam recovery system；
The dry steam exhaust outlet of second level drying machine (7) is connected with dead steam recovery system；
Waste heat recycling and water recycling are carried out by dead steam recovery system.Dead steam recovery system includes that first order steam exhaust is cooling
Device, second level steam exhaust cooler, third level steam exhaust cooler.First order steam exhaust cooler, second level steam exhaust cooler, the third level
Steam exhaust cooler is successively linked in sequence.
First order steam exhaust cooler is vapor-water heat exchanger, and vapour is flanked into dry steam exhaust, and water flanks solidifying into generating set
System is born water, first order steam exhaust cooler has condensing water inlet and cooling water outlet, and first order steam exhaust cooler cooling water goes out
Mouth is connected with turbine discharge cooling and low-pressure heating system mesolow heater.The dry steam exhaust in first order steam exhaust cooler
It exchanges heat with generating set condensed water, enters low-pressure heater after condensed water heating.
Steam exhaust cooler in the second level is vapor-water heat exchanger, and vapour is flanked into dry steam exhaust, the side Qi Shui successively with circulating pump, sky
Hot-air heater is connected by water lines and constitutes heat transferring medium water-flow circuit；Air heater air intake is connected with environment,
Air outlet slit is connected with boiler air entrance.Dry steam exhaust exchanges heat with heat transferring medium water in second level steam exhaust cooler,
Enter air heater after the heating of heat transferring medium water, for heating the surrounding air into boiler in air heater.
Third level steam exhaust cooler is vapor-water heat exchanger, and vapour is flanked into dry steam exhaust, and the side Qi Shui is connected with hot net water.?
Dry steam exhaust exchanges heat with hot net water in third level steam exhaust cooler, enters heat supply heat supply network after hot net water heating.
By sequentially entering three steam exhaust coolers；By heating Steam Turbine Regenerative System condensed water, heating boiler air-supply, also
It can be to external heat supply network heat supply.
In three steam exhaust coolers, cooling medium (generating set condensed water, circulating picture-changing hot water and heat supply network recirculated water) with
The heat exchange of the Mixed Gas Condensation of water vapour and air, a large amount of vapor are cooled, and the incondensable gases such as air carry few
The steam of amount is discharged into atmosphere；Generating set condensed water after heat exchange enters low-pressure heater, and circulating picture-changing hot water enters air heating
Device, heat supply network recirculated water enter heat supply network for thermal output, and waste heat is recycled and recycled.
Three steam exhaust coolers are provided with hydrophobic pipeline, and the condensed condensate liquid of vapor is through condensed water blowback in steam exhaust
It receives to unit draining system, realizes the recycling to lignite water content.
Three steam exhaust coolers, which are provided with, switches bypass, is realized using switching bypass in Various Seasonal operating condition or equipment event
Each steam exhaust cooler is put into operation or cut off when barrier maintenance.
The advantages of the utility model
1. the utility model carries out predrying to lignite using boiler exhaust gas waste heat and low-grade flue gas heat, to realize
Cascaded utilization of energy, is greatly lowered 2~10g/kWh. of coal consumption for power generation amount
2. the utility model brown coal drying process safety is stable.
Finally, it should be noted that being not intended to limit the utility model the foregoing is merely the explanation of the utility model, to the greatest extent
The utility model is described in detail in pipe, for those skilled in the art, can still be remembered to aforementioned
The technical solution of load is modified or equivalent replacement of some of the technical features.All spirit in the utility model
Within principle, any modification, equivalent replacement, improvement and so on be should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of smoke multistage drying brown coal electricity generation system, coal-burning boiler is by pipeline and smoke processing system and desulfurizing tower phase
Even；Low-temperature flue gas is discharged after desulfurizing tower；It is characterized in that, lignite is by being sent into boiler after smoke multistage drying system；Flue gas is more
Grade drying system includes the first order drying machine that is sequentially connected in series and second level drying machine, wherein first order drying machine coal export with
The dry machine-made egg-shaped or honey-comb coal briquets entrance in the second level is connected, and second level drying machine coal export is connected with boiler；Desulfurizing tower exhanst gas outlet passes through fume pipe
Road is connected with the smoke inlet of gas cooler, and first order drying machine is interconnected to constitute closed type hot with gas cooler and is recycled back to
It is dry to carry out the first order to lignite using low-temperature flue gas waste heat for road；Second level drying machine smoke inlet takes out mouth phase with boiler smoke
Even, extraction section high temperature flue-gas from boiler carries out depth drying to lignite.
2. smoke multistage drying brown coal electricity generation system according to claim 1, which is characterized in that first order drying machine heat is followed
Heat pump compressor is set in loop back path；Heat pump fluid outlet in gas cooler passes through pipeline and heat pump compressor entrance phase
Even, heat pump compressor heat pump fluid outlet is connected by pipeline with the heat pump fluid entrance of first order drying machine, and the first order is dry
The outlet of machine heat pump fluid is connected to constitute enclosed soft circulation circuit by the road with the heat pump fluid entrance in gas cooler.
3. smoke multistage drying brown coal electricity generation system according to claim 2, which is characterized in that first order drying machine heat pump
Sender property outlet is also connected with throttle valve by the road, and throttle valve is connected by pipeline with the heat pump fluid entrance in gas cooler.
4. smoke multistage drying brown coal electricity generation system according to claim 1, which is characterized in that second level drying machine flue gas
The boiler tail flue gas of entrance is extracted from boiler tail superheater and economizer junction, and flue-gas temperature is 500 DEG C~750 DEG C,
Flue gas after having exchanged heat is arranged continues heat release in main air preheater, work of the flue gas after heat release is complete in boiler draft machine negative pressure
With lower row to fume treatment auxiliary.
5. smoke multistage drying brown coal electricity generation system according to claim 1, which is characterized in that first order drying machine is heat
Pump work substance/dried medium heat exchange structure is low-temperature zone heater, using tube still heater, dried medium is walked in pipe, is walked outside pipe
Heat pump fluid；Second level drying machine is heating flue gas/dried medium heat exchange structure, is high temperature section heater, using shell and tube plus
Hot device walks dried medium in pipe, and pipe is outer to be walked to heat flue gas.
6. smoke multistage drying brown coal electricity generation system according to claim 1, which is characterized in that first order drying machine is dry
Steam exhaust outlet is connected with dead steam recovery system；Drying machine dry steam exhaust outlet in the second level is connected with dead steam recovery system.
7. smoke multistage drying brown coal electricity generation system according to claim 1, which is characterized in that lignite is dry in the first order
It is dried in machine to quality moisture content 15%~25%, is dried in the drying machine of the second level to quality moisture content 5%~10%.
8. smoke multistage drying brown coal electricity generation system according to claim 6, which is characterized in that dead steam recovery system carries out
Waste heat recycling and water recycling；Dead steam recovery system includes first order steam exhaust cooler, second level steam exhaust cooler, third level steam exhaust
Cooler, first order steam exhaust cooler, second level steam exhaust cooler, third level steam exhaust cooler are successively linked in sequence；Steam exhaust according to
It is secondary to enter three steam exhaust coolers；It, can also be to external heat supply network by heating Steam Turbine Regenerative System condensed water, heating boiler air-supply
Heat supply.
9. smoke multistage drying brown coal electricity generation system according to claim 8, which is characterized in that three steam exhaust coolers are equal
It is provided with hydrophobic pipeline, the condensed condensate liquid of vapor is recycled to unit draining system, realization pair through condensate pump in steam exhaust
The recycling of lignite water content.
10. smoke multistage drying brown coal electricity generation system according to claim 8, which is characterized in that three steam exhaust coolers
It is provided with switching bypass, is realized using switching bypass cooling to each steam exhaust when Various Seasonal operating condition or equipment fault are repaired
Device is put into operation or is cut off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201820491227.4U CN208205050U (en) | 2018-04-08 | 2018-04-08 | A kind of smoke multistage drying brown coal electricity generation system |
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| CN201820491227.4U CN208205050U (en) | 2018-04-08 | 2018-04-08 | A kind of smoke multistage drying brown coal electricity generation system |
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| CN208205050U true CN208205050U (en) | 2018-12-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108626740A (en) * | 2018-04-08 | 2018-10-09 | 大唐(北京)能源管理有限公司 | A kind of smoke multistage drying brown coal electricity generation system |
| CN108626740B (en) * | 2018-04-08 | 2024-04-26 | 大唐(北京)能源管理有限公司 | Multistage dry brown coal power generation system of flue gas |
-
2018
- 2018-04-08 CN CN201820491227.4U patent/CN208205050U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108626740A (en) * | 2018-04-08 | 2018-10-09 | 大唐(北京)能源管理有限公司 | A kind of smoke multistage drying brown coal electricity generation system |
| CN108626740B (en) * | 2018-04-08 | 2024-04-26 | 大唐(北京)能源管理有限公司 | Multistage dry brown coal power generation system of flue gas |
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