CN203857749U - System used for preheating lignite by power plant waste heat and recycling water - Google Patents
System used for preheating lignite by power plant waste heat and recycling water Download PDFInfo
- Publication number
- CN203857749U CN203857749U CN201420258841.8U CN201420258841U CN203857749U CN 203857749 U CN203857749 U CN 203857749U CN 201420258841 U CN201420258841 U CN 201420258841U CN 203857749 U CN203857749 U CN 203857749U
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- CN
- China
- Prior art keywords
- fluidized bed
- bed dryer
- heat exchanger
- waste heat
- air
- 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.)
- Expired - Lifetime
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- 239000003077 lignite Substances 0.000 title claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 239000010908 plant waste Substances 0.000 title abstract 2
- 238000004064 recycling Methods 0.000 title abstract 2
- 239000002918 waste heat Substances 0.000 claims abstract description 29
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 239000007789 gas Substances 0.000 claims abstract description 12
- 239000003245 coal Substances 0.000 claims description 17
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 238000001035 drying Methods 0.000 abstract description 7
- 238000001704 evaporation Methods 0.000 abstract description 3
- 230000008020 evaporation Effects 0.000 abstract description 3
- 238000005243 fluidization Methods 0.000 abstract description 3
- 238000010248 power generation Methods 0.000 abstract 1
- 239000000498 cooling water Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000002269 spontaneous effect Effects 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008246 gaseous mixture Substances 0.000 description 1
- 239000003317 industrial substance Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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
- 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
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- Drying Of Solid Materials (AREA)
Abstract
Disclosed is a system used for preheating lignite by power plant waste heat and recycling water. The system is characterized in that an exhaust port of a steam turbine is connected with a steam condenser, a water outlet of the steam condenser is connected with a flow controller, the flow controller is connected with an air heat exchanger and a heater internally disposed in the fluidized bed dryer, an air outlet of the air heat exchanger is connected with a fluidization medium inlet of the fluidized bed dryer, a gas outlet of the fluidized bed dryer is connected with a deduster and an air condenser, a lignite outlet of the fluidized bed dryer is connected with an inlet of a lignite mill, and the air heat exchanger is connected with a water outlet of the fluidized bed dryer and a cooling tower. Heat utilized by the system is completely from circulating water of the cooling tower and other waste heat of a power plant, heat loss and water evaporation in the cooling tower can be reduced effectively, load of the cooling tower is lowered, and the system serving as a lignite pre-drying process of a lignite-fired power plant can remarkably improve power generation efficiency of the power plant.
Description
Technical field
The utility model relates to power station used heat utilization and brown coal drying technical field, is specifically related to a kind of system of utilizing the predrying brown coal of power station used heat and moisture to reclaim.
Background technology
Brown coal outward appearance is brown or pitchy, contains higher moisture and volatile matter.The total moisture of brown coal is generally between 30～60%, and volatile matter content is generally higher than 40%.Brown coal rich content, cheap, there is good fire behaviour and burnout characteristic, be a kind of good power fuel and industrial chemicals, be mainly distributed in Eastern Inner Mongolia and the Northeast.Because brown coal moisture is high, be unfavorable for long-distance transportation, the brown coal that simultaneously directly burn, make brown coal generating efficiency low, have hindered the application of brown coal in electricity generation system, therefore, and transportation or the generating of burning brown coal again after conventionally brown coal being first dried.
At present, conventional brown coal drying technique comprises and adopts hot flue gas directly to heat and utilize the indirect whizzer drying brown coal of steam.The former,, because brown coal volatile matter is high, is subject to the impact of dry flue gas temperature, easily causes spontaneous combustion, and drier is bulky, and cost is high, and the dry disposal ability of unit volume is low; Drier moving component is many, and power consumption is large, and fragile.The latter need to be carried wet body, and energy consumption for drying is high, and single machine yield is little, for large-scale power station, needs multiple devices in parallel.Consider safety factor, needing increases ammonia gas generating device, prevents brown coal burning in dry run, and equipment investment is large.
The recirculated cooling water in power station is for condensing turbine steam discharge, for boiler provides feedwater.The hot water of condensator outlet (common 50 ℃ of left and right) is admitted to cooling tower, in cooling tower by with air heat-exchange, general temperature reduces by 11～12 ℃ of left and right, this part heat is directly discharged in atmosphere, it is a waste heat source in burning power station, if can effectively utilize this part heat, can effectively reduce cooling tower raw make up water amount, reduce evaporation capacity.
Summary of the invention
The problem existing in order to solve above-mentioned prior art, the purpose of this utility model is to provide a kind of system of utilizing the predrying brown coal of power station used heat and moisture to reclaim, utilize the used heat of power station recirculated cooling water and other used heat to carry out predrying to brown coal, reclaim the moisture comprehensive utilization in brown coal simultaneously, there is dry coal output large, without the feature of spontaneous combustion risk, and improve generating efficiency.
In order to achieve the above object, the technical solution adopted in the utility model is:
A kind of system of utilizing the predrying brown coal of power station used heat and moisture to reclaim, comprise stram condenser 3, the air inlet of described stram condenser 3 is connected with the exhaust outlet of steam turbine 2, the delivery port connection traffic controller 18 of described stram condenser 3, described flow controller 18 is controlled respectively the hot water amount who enters air heat exchanger 5 and the built-in heater of fluidized bed dryer 10, the gas outlet of described air heat exchanger 5 connects fluidized bed dryer 10 fluidizing agent entrances, the gas vent of described fluidized bed dryer 10 connects deduster 14 and aerial condenser 15, the coal export of described fluidized bed dryer 10 is connected with the entrance of coal pulverizer 13, the delivery port of described air heat exchanger 5 and fluidized bed dryer 10 is connected with the water inlet of cooling tower 8.
On the pipeline being connected with the built-in heater of fluidized bed dryer 10 at the delivery port of stram condenser 3, the first waste heat exchanger 12 is set, on the pipeline being connected with fluidized bed dryer 10 fluidizing agent entrances in the gas outlet of air heat exchanger 5, the second waste heat exchanger 9 is set, described the first waste heat exchanger 12 and the second waste heat exchanger 9 are for utilizing other waste heat source of power station.
The method that above-described system utilizes the predrying brown coal of power station used heat and moisture to reclaim, described steam turbine 2 steam discharges are after stram condenser 3 heat exchange, the recirculated water of stram condenser 3 outlets is divided into two parts: a part flows into air heat exchanger 5, air 7 is heated, and the air after heating is as the fluidizing agent of fluidized bed dryer 10; Another part recirculated water is in the laggard internal heater that enters fluidized bed dryer 10 of the first waste heat exchanger 12 post bake, for the dry run of brown coal raw material 11 provides heat, dried brown coal enter in coal pulverizer 13, and the water of discharging through air heat exchanger 5 and fluidized bed dryer 10 built-in heat exchangers enters cooling tower 8 as recirculated cooling water; The air of fluidized bed dryer 10 discharges and water vapor mixture are removed after bulky grain coal dust through deduster 14, gaseous mixture enters aerial condenser 15, air 16 is discharged from the top of aerial condenser 15, condensed water 17 comprehensive utilization from discharge aerial condenser 15 bottoms.
If also have other waste heat source in power station, again heat by the first waste heat exchanger 12 and 9 pairs of water and airs of the second waste heat exchanger respectively.
Compared to the prior art, tool has the following advantages the utility model:
1, the heat that the utility model utilizes, completely from cooling water and power station used heat, can effectively reduce heat loss and water evaporation quantity in cooling tower, reduces cooling tower load, as the predrying technique of coal fired power plant brown coal, can significantly improve the generating efficiency in power station.In addition, the utility model can reclaim the moisture in brown coal effectively, and rich coal water-deficient area is had great importance.
2, the predrying system of brown coal that the utility model is integrated and recovery system separated with aqueous vapor, can reclaim brown moisture in coal comprehensive utilization.
3, the utility model utilizes power station used heat as the energy source of fluidization air and drying brown coal, and its operating temperature is lower, and brown coal are without spontaneous combustion risk, and gas does not need protection.
4, utilize the first waste heat exchanger and the second waste heat exchanger again to heat the water and air entering in fluidized bed dryer, improve brown coal dewatering efficiency.
Accompanying drawing explanation
Accompanying drawing is the system schematic that the utility model utilizes the predrying brown coal of power station used heat and moisture to reclaim.
In figure: 1-boiler 2-steam turbine 3-stram condenser
4-boiler feed pump 5-air heat exchanger 6-air blower
7-air 8-cooling tower 9-the second waste heat exchanger
10-fluidized bed dryer 11-brown coal raw material 12-the first waste heat exchanger
13-coal pulverizer 14-deduster 15-aerial condenser
16-air 17-condensed water 18-flow controller
The specific embodiment
Below in conjunction with drawings and the specific embodiments, the utility model is described in further detail.
As shown in drawings, a kind of system of utilizing the predrying brown coal of power station used heat and moisture to reclaim of the utility model, comprise stram condenser 3, the air inlet of described stram condenser 3 is connected with the exhaust outlet of steam turbine 2, the delivery port connection traffic controller 18 of described stram condenser 3, described flow controller 18 is controlled respectively the hot water amount who enters air heat exchanger 5 and the built-in heater of fluidized bed dryer 10, the gas outlet of described air heat exchanger 5 connects fluidized bed dryer 10 fluidizing agent entrances, the gas vent of described fluidized bed dryer 10 connects deduster 14 and aerial condenser 15, the coal export of described fluidized bed dryer 10 is connected with the entrance of coal pulverizer 13, the delivery port of described air heat exchanger 5 and fluidized bed dryer 10 is connected with the water inlet of cooling tower 8.
As preferred embodiment of the present utility model, on the pipeline being connected with the built-in heater of fluidized bed dryer 10 at the delivery port of stram condenser 3, the first waste heat exchanger 12 is set, on the pipeline being connected with fluidized bed dryer 10 fluidizing agent entrances in the gas outlet of air heat exchanger 5, the second waste heat exchanger 9 is set, described the first waste heat exchanger 12 and the second waste heat exchanger 9 are for utilizing other waste heat source of power station.
As shown in drawings, superheated steam pushing turbine 2 generatings that boiler 1 produces, steam turbine 2 steam discharges, after stram condenser 3 heat exchange, are sent into boiler 1 system by boiler feed pump 4 and are produced steam.The recirculated water (approximately 50 ℃) of stram condenser 3 outlets is divided into two parts, a part heats air 7 through air heat exchanger 5, air after heating (approximately 42 ℃) is as the fluidizing agent of fluidized bed dryer 10, if also have other waste heat source in power station, can continue through the second waste heat exchanger 9, this air to be heated again, then send in fluidized bed dryer 10 fluidizing agent as brown coal drying; Another part recirculated water (approximately 50 ℃) is sent in the built-in heater of fluidized bed dryer 10, if also have other waste heat source in power station, can continue through the first waste heat exchanger 12, this recirculated water to be heated again, then send in the built-in heater of fluidized bed dryer 10, for the dry run of brown coal raw material 11 provides heat, the water of discharging from air heat exchanger 5 and fluidized bed dryer 10 internal heater directly enters cooling tower 8.
After fluidized bed dryer 10 is dry, part moisture in brown coal and fluidization air are discharged from fluidized bed dryer 10 with the form of air-water mixture, after deduster 14 is removed the coal grain that wherein particle diameter is larger, enter aerial condenser 15, after gas-water separation, air 16 directly enters in atmosphere, and condensed water is comprehensive utilization from discharge air cooler bottom.
The coal-fired power plant of 600MW of take is example, raw material brown coal As-received moisture content (M
ar) be 38.5%, adopt this system and method, build raw coal treating capacity 250th
-1the predrying system of brown coal, the moisture of brown coal can be down to 27.9% by 36.8%, removes in coal about 25% moisture.By theory, calculate, use the brown coal after partial dehydration, net boiler efficiency has improved 2.6%, and net heat flow improves 2.8%, and fuel quantity reduces 10.8%, and exhaust gas volumn reduces by 4%.Because coal flow reduces and grindability raising, coal pulverizer power-dissipation-reduced 17%, blower fan power-dissipation-reduced 3.8%, full factory power consumption has reduced by 3.8%, and meanwhile, the temperature of recirculated cooling water reduces approximately 10 ℃, can reclaim the used heat of power plant 20%.
Claims (2)
1. a system of utilizing the predrying brown coal of power station used heat and moisture to reclaim, it is characterized in that: comprise stram condenser (3), the air inlet of described stram condenser (3) is connected with the exhaust outlet of steam turbine (2), the delivery port connection traffic controller (18) of described stram condenser (3), described flow controller (18) is controlled respectively the hot water amount who enters air heat exchanger (5) and the built-in heater of fluidized bed dryer (10), the gas outlet of described air heat exchanger (5) connects fluidized bed dryer (10) fluidizing agent entrance, the gas vent of described fluidized bed dryer (10) connects deduster (14) and aerial condenser (15), the coal export of described fluidized bed dryer (10) is connected with the entrance of coal pulverizer (13), the delivery port of described air heat exchanger (5) and fluidized bed dryer (10) is connected with the water inlet of cooling tower (8).
2. a kind of system of utilizing the predrying brown coal of power station used heat and moisture to reclaim according to claim 1, it is characterized in that: on the pipeline being connected with the built-in heater of fluidized bed dryer (10) at the delivery port of stram condenser (3), the first waste heat exchanger (12) is set, on the pipeline being connected with fluidized bed dryer (10) fluidizing agent entrance in the gas outlet of air heat exchanger (5), the second waste heat exchanger (9) is set, described the first waste heat exchanger (12) and the second waste heat exchanger (9) are for utilizing other waste heat source of power station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420258841.8U CN203857749U (en) | 2014-05-20 | 2014-05-20 | System used for preheating lignite by power plant waste heat and recycling water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420258841.8U CN203857749U (en) | 2014-05-20 | 2014-05-20 | System used for preheating lignite by power plant waste heat and recycling water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203857749U true CN203857749U (en) | 2014-10-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420258841.8U Expired - Lifetime CN203857749U (en) | 2014-05-20 | 2014-05-20 | System used for preheating lignite by power plant waste heat and recycling water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203857749U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983088A (en) * | 2014-05-20 | 2014-08-13 | 西安热工研究院有限公司 | System and method for predrying lignite and recycling water by using waste heat of power station |
| CN109489360A (en) * | 2018-11-19 | 2019-03-19 | 刘燕红 | A kind of coal-fired flue-gas reuse means |
-
2014
- 2014-05-20 CN CN201420258841.8U patent/CN203857749U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983088A (en) * | 2014-05-20 | 2014-08-13 | 西安热工研究院有限公司 | System and method for predrying lignite and recycling water by using waste heat of power station |
| CN109489360A (en) * | 2018-11-19 | 2019-03-19 | 刘燕红 | A kind of coal-fired flue-gas reuse means |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141001 |