CN107036432A - Reclaim heat and extract raw coal drying system before the coal pulverizer of moisture in coal - Google Patents
Reclaim heat and extract raw coal drying system before the coal pulverizer of moisture in coal Download PDFInfo
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- CN107036432A CN107036432A CN201710410015.9A CN201710410015A CN107036432A CN 107036432 A CN107036432 A CN 107036432A CN 201710410015 A CN201710410015 A CN 201710410015A CN 107036432 A CN107036432 A CN 107036432A
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- coal
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2201/00—Pretreatment of solid fuel
- F23K2201/10—Pulverizing
- F23K2201/1006—Mills adapted for use with furnaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2201/00—Pretreatment of solid fuel
- F23K2201/20—Drying
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Drying Of Solid Materials (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
Raw coal drying system before a kind of coal pulverizer for reclaiming heat and extracting moisture in coal, is characterized in：Including furnace smoke drying machine, screw(-type) feeder, coal gate, cyclone separator, mixing chamber, steam air heater, water taking heat-transfer device, isolating door, dried using high-temperature flue gas heat coal-fired, combustion moisture in coal is extracted simultaneously, supported the use with unit pulverized-coal system, boiler island efficiency can be improved, gross coal consumption rate is reduced, realizes that fume afterheat is utilized and Water Sproading, while also make it that traditional unit pulverized-coal system grinds high moisture content lignite.
Description
Technical field
The invention belongs to steam power plant technical field, and in particular to reclaim heat and extract coal in a kind of thermal power plant
Raw coal drying system before the coal pulverizer of middle moisture.
Background technology
The explored lignite of China accounts for the 13% of national coal gross reserves, because lignite has high volatile, high-moisture, height
The features such as ash content, low heat value, low ash smelting point, easy spontaneous combustion, cause the exhaust gas volumn generated in lignite generating combustion process big, power plant's pot
Stove burning heating rate is relatively low, and the utilization of lignite is very limited.
At present, in view of the above-mentioned problems, generally setting independent brown coal drying system to carry out lignite in thermal power plant
It is pre-dried so that the water content of lignite, which is reduced to, to be met after standard, then lignite is transported in boiler is burnt and generated electricity.
Brown coal drying system and electricity generation system, which are separately provided, causes the numerous and diverse of electrification technique and operation, management inconvenience；Meanwhile, the heat of boiler
Source can not be effectively utilized, and cause energy waste.
The content of the invention
It is an object of the invention to provide raw coal drying system, profit before a kind of coal pulverizer for reclaiming heat and extracting moisture in coal
Fire coal is dried with high-temperature flue gas heat, while extracting combustion moisture in coal, is supported the use with unit pulverized-coal system, improves boiler island
Efficiency, reduces gross coal consumption rate, realizes that fume afterheat is utilized and Water Sproading, while also causing traditional unit pulverized-coal system to grind height
Moisture lignite is possibly realized.
To achieve the above object, the present invention provides raw coal before a kind of coal pulverizer for reclaiming heat and extracting moisture in coal and dried
System, including run coal bin, feeder, furnace smoke drying machine, screw(-type) feeder, coal gate, cyclone separator, weary gas blower fan, mixing
Mouth, low-level (stack-gas) economizer, cold smoke blower fan, steam air heater, water taking heat-transfer device, regulation door, isolating door are taken out in room, high-temperature flue gas, and its feature exists
In：Furnace smoke drying machine is arranged above coal pulverizer, and high-temperature flue gas import and raw coal input port, lower section are provided with above furnace smoke drying machine
Provided with the outlet of weary gas and coal export, furnace smoke drying machine connects the flue outlet of mixing chamber, the chimney intake of mixing chamber respectively with height
Warm stove cigarette takes out mouth, the connection of deduster rear pass, and cold smoke blower fan is provided between mixing chamber and deduster rear pass；
The outlet of furnace smoke drying machine-made egg-shaped or honey-comb coal briquets is connected with screw(-type) feeder entrance, and the weary gas of furnace smoke drying machine exports weary with cyclone separator
Gas entrance is connected, and the solid-phase outlet of cyclone separator and the entrance of screw(-type) feeder are connected；The exhanst gas outlet of cyclone separator leads to
Weary gas blower fan is crossed to be connected with steam air heater entrance；
The outlet of screw(-type) feeder is connected with coal pulverizer, and coal gate, coal pulverizer and pot are provided between screw(-type) feeder and coal pulverizer
Burner is connected；
The air intake connection cold-air vent of steam air heater, the air outlet slit of steam air heater is preheated by primary air fan and boiler air
Device import is connected, and air preheater outlet is connected with coal pulverizer；
The weary gas outlet of steam air heater is connected with the weary gas entrance of water taking heat-transfer device, and the weary gas exhaust pass of water taking heat-transfer device is divided into two
Road, is connected with boiler-burner air intlet all the way；Another Lu Lianyu coal pulverizers connection, centre is provided with regulation door and isolating door；
Condensation water inlet, condensation-water drain, Water Sproading mouthful are respectively equipped with water taking heat-transfer device, condensed water is by generating set condensate
System is provided, and the water that water taking heat-transfer device is reclaimed is used as power-plant makeup.
Further, the high-temperature flue gas import is located at below furnace smoke drying machine, and drying mode takes blowback type.
Beneficial effect of the present invention：The present invention can realize as-fired coal predrying, and drying system can coordinate various forms of
Unit pulverized-coal system is used, and can reduce boiler volume, reduces gross coal consumption rate, boiler efficiency is improved, while can be real
The recovery of existing great lot of water resources, it is possible to decrease the investment of power plant's life cycle management.
Brief description of the drawings
Fig. 1 is the schematic diagram of the direct-firing drying of following current of the present invention；
Fig. 2 is the schematic diagram of the direct-firing drying of adverse current of the invention.
In figure：1- run coal bins；2- feeders；3- furnace smoke drying machines；4- screw(-type) feeders；5- coal gates；6- whirlwind
Separator；The weary gas blower fans of 7-；8- mixing chambers；9- high-temperature flue gas takes out mouth；10- boiler-burners；11- steam air heaters；12- fetches water
Heat exchanger；13- water taking heat-transfers device condenses water inlet；14- water taking heat-transfers device condenses water out；15- water taking heat-transfer devices Water Sproading mouthful；
16- primary air fans；17- boiler air preheaters；18- adjusts door；19- isolating doors；20- cold smoke blower fans；21- low-level (stack-gas) economizers；
22- dedusters；23- air-introduced machines；24- desulfurizing towers；25- chimneys；26- cool air inlets；27- coal pulverizers.
Embodiment
Referring to the drawings 1, accompanying drawing 2, the specific embodiment of the invention is as follows：
The present invention includes furnace smoke drying machine, screw(-type) feeder, coal gate, cyclone separator, mixing chamber, steam air heater, water taking heat-transfer
Device, isolating door；The chimney intake of mixing chamber is taken out mouth, deduster rear pass with high-temperature flue gas and connected respectively, mixing chamber and deduster
Cold smoke blower fan is provided between rear pass, the flue outlet of mixing chamber is connected with furnace smoke drying machine；Furnace smoke drying machine is arranged at coal-grinding
Above machine, high-temperature flue gas import and raw coal input port are provided with above furnace smoke drying machine, lower section is exported and coal export provided with weary gas, stove
Cigarette drying machine coal export is connected with screw(-type) feeder entrance, the weary gas outlet of furnace smoke drying machine and the weary gas entrance of cyclone separator
Connection, the solid-phase outlet of cyclone separator and the entrance of screw(-type) feeder are connected；The exhanst gas outlet and steam air heater of cyclone separator
Entrance is connected, and weary gas blower fan is provided between cyclone separator and steam air heater；The outlet of screw(-type) feeder is connected with coal pulverizer, spiral
Coal gate is provided between batcher and coal pulverizer, coal pulverizer is connected with boiler-burner；The air of cool air inlet and steam air heater
Entrance is connected, and the air outlet slit of steam air heater is connected with boiler air preheater import, between steam air heater and boiler air preheater
Provided with primary air fan；Air preheater outlet is connected with coal pulverizer；The outlet of weary gas and the weary gas entrance of water taking heat-transfer device of steam air heater
Connection, the weary gas exhaust pass of water taking heat-transfer device is divided into two-way, is connected all the way with boiler-burner air intlet；Another Lu Lianyu
Coal pulverizer is connected, and centre is provided with regulation door and isolating door；Condensation water inlet, cooling water outlet, water are respectively equipped with water taking heat-transfer device
Recovery port, condensed water is provided by generating set condensate system, and the water that water taking heat-transfer device is reclaimed is used as power-plant makeup；Stove cigarette is passed through
Discharged after low-level (stack-gas) economizer, deduster, air-introduced machine, desulfurizing tower, chimney；The high-temperature flue gas import is located under furnace smoke drying machine
Side, drying mode takes blowback type.
The course of work of the present invention：
Cold smoke goes out to extract by cold smoke blower fan from deduster rear pass, and into mixing chamber, high-temperature flue gas takes out mouth by high-temperature flue gas
Mixed after burner hearth extraction into mixing chamber with cold smoke, to reach the requirement of furnace smoke drying machine inlet flue gas temperature, flue gas enters
Mixed after furnace smoke drying machine with raw coal, accompanying drawing 1 describes the furnace smoke drying machine using following current heat exchange mode, and flue gas is in stove
The weary gas outlet of cigarette drying machine bottom enters cyclone separator after drawing；Accompanying drawing 2 describes the stove using countercurrent heat exchange method
Cigarette drying machine, flue gas enters cyclone separator after being drawn in the weary gas outlet on furnace smoke drying machine top.Flue gas is in furnace smoke drying machine
Into cyclone separator after the weary gas outlet extraction of bottom, after weary gas is further separated with coal dust in cyclone separator, weary gas enters
Enter weary gas blower fan, by the weary gas of weary gas blower fan, then sequentially enter after steam air heater, water taking heat-transfer device, enter through boiler-burner
Burner hearth；The weary gas in part can also be mixed by adjusting door and isolating door with heat primary air, oxygen-containing to adjust coal pulverizer drier
Amount；
Raw coal in run coal bin is fed in furnace smoke drying machine through feeder, is entered in furnace smoke drying machine with mixing chamber outlet flue gas
Row mixing, the coal that the coal that furnace smoke drying machine bottom coal export is isolated is isolated with cyclone separator enters screw feeder jointly
Machine, coal enters coal pulverizer through screw(-type) feeder, and the coal dust ground is carried by a hot blast to be fired through boiler-burner into burner hearth
Burn；
After cold air is heated through steam air heater, continue to preheat into boiler air preheater, be used as boiler combustion air；
Water taking heat-transfer device cooling medium is provided by unit condensate system, water taking heat-transfer device fume side condensation water after processing,
As power-plant makeup, power-plant makeup amount can be greatly lowered；Boiler tail flue gas is with conventional thermal power plant flue gas system, flue gas
Low-level (stack-gas) economizer, deduster, air-introduced machine, desulfurizing tower are sequentially passed through finally through smoke stack emission to air.
Claims (2)
1. raw coal drying system before a kind of coal pulverizer for reclaiming heat and extracting moisture in coal, including run coal bin, feeder, stove cigarette
Drying machine, screw(-type) feeder, coal gate, cyclone separator, weary gas blower fan, mixing chamber, high-temperature flue gas take out mouth, low-level (stack-gas) economizer,
Cold smoke blower fan, steam air heater, water taking heat-transfer device, regulation door, isolating door, it is characterised in that：Furnace smoke drying machine is arranged on coal pulverizer
High-temperature flue gas import and raw coal input port are provided with above side, furnace smoke drying machine, lower section is exported and coal export provided with weary gas, and stove cigarette is done
Dry machine connects the flue outlet of mixing chamber, and the chimney intake of mixing chamber is taken out mouth, deduster rear pass with high-temperature flue gas and connected respectively,
Cold smoke blower fan is provided between mixing chamber and deduster rear pass；
The outlet of furnace smoke drying machine-made egg-shaped or honey-comb coal briquets is connected with screw(-type) feeder entrance, and the weary gas of furnace smoke drying machine exports weary with cyclone separator
Gas entrance is connected, and the solid-phase outlet of cyclone separator and the entrance of screw(-type) feeder are connected；The exhanst gas outlet of cyclone separator leads to
Weary gas blower fan is crossed to be connected with steam air heater entrance；
The outlet of screw(-type) feeder is connected with coal pulverizer, and coal gate, coal pulverizer and pot are provided between screw(-type) feeder and coal pulverizer
Burner is connected；
The air intake connection cold-air vent of steam air heater, the air outlet slit of steam air heater is preheated by primary air fan and boiler air
Device import is connected, and air preheater outlet is connected with coal pulverizer；
The weary gas outlet of steam air heater is connected with the weary gas entrance of water taking heat-transfer device, and the weary gas exhaust pass of water taking heat-transfer device is divided into two
Road, is connected with boiler-burner air intlet all the way；Another Lu Lianyu coal pulverizers connection, centre is provided with regulation door and isolating door；
Condensation water inlet, condensation-water drain, Water Sproading mouthful are respectively equipped with water taking heat-transfer device, condensed water is by generating set condensate
System is provided, and the water that water taking heat-transfer device is reclaimed is used as power-plant makeup.
2. raw coal drying system, its feature before the coal pulverizer according to claim 1 for reclaiming heat and extracting moisture in coal
It is：The high-temperature flue gas import is located at below furnace smoke drying machine, and drying mode takes blowback type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710410015.9A CN107036432B (en) | 2017-06-03 | 2017-06-03 | Raw coal drying system before coal mill for recovering heat and extracting moisture in coal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710410015.9A CN107036432B (en) | 2017-06-03 | 2017-06-03 | Raw coal drying system before coal mill for recovering heat and extracting moisture in coal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107036432A true CN107036432A (en) | 2017-08-11 |
| CN107036432B CN107036432B (en) | 2023-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710410015.9A Active CN107036432B (en) | 2017-06-03 | 2017-06-03 | Raw coal drying system before coal mill for recovering heat and extracting moisture in coal |
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2017
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| CN107036432B (en) | 2023-07-14 |
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