CN107036432B - Raw coal drying system before coal mill for recovering heat and extracting moisture in coal - Google Patents
Raw coal drying system before coal mill for recovering heat and extracting moisture in coal Download PDFInfo
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- CN107036432B CN107036432B CN201710410015.9A CN201710410015A CN107036432B CN 107036432 B CN107036432 B CN 107036432B CN 201710410015 A CN201710410015 A CN 201710410015A CN 107036432 B CN107036432 B CN 107036432B
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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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- 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
A coal mill front raw coal drying system for recovering heat and extracting moisture in coal is characterized in that: the coal-fired boiler comprises a boiler smoke dryer, a screw feeder, a coal gate, a cyclone separator, a mixing chamber, a heater, a water-taking heat exchanger and an isolating door, wherein high-temperature smoke heat is utilized to dry coal, moisture in the coal is extracted, the coal-fired boiler is matched with a direct-fired pulverizing system for use, the efficiency of a boiler island can be improved, the power generation coal consumption is reduced, the smoke waste heat utilization and the water recovery are realized, and the traditional direct-fired pulverizing system is enabled to grind high-moisture lignite.
Description
Technical Field
The invention belongs to the technical field of thermal power generation equipment, and particularly relates to a coal mill front raw coal drying system for recovering heat and extracting moisture in coal in a thermal power plant.
Background
The brown coal ascertained in China accounts for 13% of the total reserve of the national coal, and the brown coal has the characteristics of high volatile matters, high moisture, high ash content, low heat value, low ash fusion point, easy spontaneous combustion and the like, so that the amount of smoke generated in the power generation combustion process of the brown coal is large, the combustion heat rate of a boiler of a power plant is low, and the utilization of the brown coal is greatly limited.
In view of the above problems, a separate lignite drying system is generally provided in a thermal power plant to pre-dry lignite so that the water content of lignite is reduced to meet the standard, and then the lignite is conveyed to a boiler for combustion to generate electricity. The independent arrangement of the lignite drying system and the power generation system causes the complexity and inconvenient operation and management of the power generation process; meanwhile, the heat source of the boiler cannot be effectively utilized, resulting in energy waste.
Disclosure of Invention
The invention aims to provide a coal mill front raw coal drying system for recovering heat and extracting moisture in coal, which utilizes high-temperature flue gas heat to dry coal and simultaneously extracts the moisture in the coal, and is matched with a direct-fired pulverizing system for use, so that the efficiency of a boiler island is improved, the power generation coal consumption is reduced, the utilization of flue gas waste heat and the water recovery are realized, and meanwhile, the traditional direct-fired pulverizing system is enabled to grind high-moisture lignite.
The invention provides a raw coal drying system before a coal mill for recovering heat and extracting moisture in coal, which comprises a raw coal bin, a coal feeder, a furnace smoke dryer, a screw feeder, a coal gate, a cyclone separator, a waste gas fan, a mixing chamber, a high-temperature furnace smoke pumping port, a low-temperature economizer, a smoke cooler, a warm air heater, a water taking heat exchanger, an adjusting door and an isolating door, and is characterized in that: the flue gas dryer is connected with a flue outlet of the mixing chamber, the flue inlet of the mixing chamber is respectively communicated with a high-temperature flue gas suction port and a rear flue of the dust remover, and an air cooler is arranged between the mixing chamber and the rear flue of the dust remover;
the coal outlet of the furnace smoke dryer is connected with the inlet of the screw feeder, the exhaust gas outlet of the furnace smoke dryer is connected with the exhaust gas inlet of the cyclone separator, and the solid phase outlet of the cyclone separator is connected with the inlet of the screw feeder; the flue gas outlet of the cyclone separator is connected with the inlet of the heater through a ventilation air fan;
the outlet of the screw feeder is connected with a coal mill, a coal gate is arranged between the screw feeder and the coal mill, and the coal mill is connected with a boiler burner;
the air inlet of the air heater is communicated with the cold air outlet, the air outlet of the air heater is connected with the inlet of the air preheater of the boiler through a primary fan, and the outlet of the air preheater is connected with the coal mill;
the exhaust gas outlet of the air heater is connected with the exhaust gas inlet of the water taking heat exchanger, the exhaust gas outlet flue of the water taking heat exchanger is divided into two paths, and one path is connected with the air inlet of the boiler burner; the other path of the water pipe is connected with a coal mill, and an adjusting door and an isolating door are arranged in the middle;
the water taking heat exchanger is respectively provided with a condensed water inlet, a condensed water outlet and a water recovery port, the condensed water is provided by a condensation water system of the generator set, and the water recovered by the water taking heat exchanger is used as the power plant makeup water.
Further, the high-temperature flue gas inlet is arranged below the flue gas dryer, and the drying mode adopts a back blowing mode.
The invention has the beneficial effects that: the invention can pre-dry the coal in the furnace, the drying system can be matched with direct-fired pulverizing systems in different forms for use, the volume of the boiler can be reduced, the power generation coal consumption can be reduced, the boiler efficiency can be improved, meanwhile, the recovery of a large amount of water resources can be realized, and the investment of the whole life cycle of the power plant can be reduced.
Drawings
FIG. 1 is a schematic illustration of the concurrent direct blow drying of the present invention;
FIG. 2 is a schematic diagram of countercurrent direct-blowing drying according to the present invention.
In the figure: 1-a raw coal bin; 2-coal feeder; 3-a furnace smoke dryer; 4-screw feeder; 5-coal gate; a 6-cyclone separator; 7-a spent air blower; 8-a mixing chamber; 9-a smoke extraction port of the high-temperature furnace; 10-boiler burner; 11-a heater; 12-a water intake heat exchanger; 13-a condensate inlet of the water taking heat exchanger; 14-a condensate outlet of the water taking heat exchanger; 15-a water recovery port of the water taking heat exchanger; 16-primary air blower; 17-boiler air preheater; 18-adjusting the door; 19-isolating door; 20-a smoke cooler; 21-a low-temperature economizer; 22-dust remover; 23-induced draft fan; 24-desulfurizing tower; 25-chimney; 26-cold air inlet; 27-coal mill.
Detailed Description
Referring to fig. 1 and 2, the following embodiments of the present invention are as follows:
the invention comprises a furnace smoke dryer, a screw feeder, a coal gate, a cyclone separator, a mixing chamber, a heater, a water taking heat exchanger and an isolation gate; the flue inlet of the mixing chamber is respectively communicated with the smoke suction port of the high-temperature furnace and the rear flue of the dust remover, an air cooler is arranged between the mixing chamber and the rear flue of the dust remover, and the flue outlet of the mixing chamber is connected with a furnace smoke dryer; the furnace smoke dryer is arranged above the coal mill, a high-temperature furnace smoke inlet and a raw coal input port are arranged above the furnace smoke dryer, a waste gas outlet and a coal outlet are arranged below the furnace smoke dryer, the coal outlet of the furnace smoke dryer is connected with the inlet of the screw feeder, the waste gas outlet of the furnace smoke dryer is connected with the waste gas inlet of the cyclone separator, and the solid phase outlet of the cyclone separator is connected with the inlet of the screw feeder; the flue gas outlet of the cyclone separator is connected with the inlet of the heater, and a exhaust fan is arranged between the cyclone separator and the heater; the outlet of the screw feeder is connected with a coal mill, a coal gate is arranged between the screw feeder and the coal mill, and the coal mill is connected with a boiler burner; the cold air inlet is connected with the air inlet of the air heater, the air outlet of the air heater is connected with the inlet of the boiler air preheater, and a primary fan is arranged between the air heater and the boiler air preheater; the outlet of the air preheater is connected with a coal mill; the exhaust gas outlet of the air heater is connected with the exhaust gas inlet of the water taking heat exchanger, the exhaust gas outlet flue of the water taking heat exchanger is divided into two paths, and one path is connected with the air inlet of the boiler burner; the other path of the water pipe is connected with a coal mill, and an adjusting door and an isolating door are arranged in the middle; the water taking heat exchanger is respectively provided with a condensed water inlet, a cold water outlet and a water recovery port, condensed water is provided by a condensation water system of the generator set, and water recovered by the water taking heat exchanger is used as power plant makeup water; the furnace smoke is discharged after passing through a low-temperature economizer, a dust remover, an induced draft fan, a desulfurizing tower and a chimney; the high-temperature furnace smoke inlet is arranged below the furnace smoke dryer, and the drying mode adopts a back blowing mode.
The working process of the invention comprises the following steps:
cold smoke is extracted from a rear flue of a dust remover through a cold smoke blower and enters a mixing chamber, high-temperature furnace smoke is extracted from a hearth through a high-temperature furnace smoke extraction port and then enters the mixing chamber to be mixed with cold smoke so as to meet the requirement of the temperature of the smoke at the inlet of a furnace smoke dryer, the smoke enters the furnace smoke dryer and then is mixed with raw coal, the description of the figure 1 shows the furnace smoke dryer adopting a downstream heat exchange mode, and the smoke is led out from a exhaust gas outlet at the lower part of the furnace smoke dryer and then enters a cyclone separator; figure 2 illustrates a flue gas dryer employing a countercurrent heat exchange mode, wherein flue gas is introduced from a vent gas outlet in the upper part of the flue gas dryer and enters a cyclone separator. The flue gas is led out from a waste gas outlet at the lower part of the flue gas dryer and enters a cyclone separator, waste gas and coal dust in the cyclone separator are further separated, the waste gas enters a waste gas fan, and the waste gas passes through the waste gas fan and then enters a heater and a water intake heat exchanger in sequence, and then enters a hearth through a boiler burner; part of exhaust gas can be mixed with hot primary air through an adjusting door and an isolating door so as to adjust the oxygen content of a drier of the coal mill;
raw coal in a raw coal bin is fed into a furnace smoke dryer through a coal feeder, the raw coal is mixed with flue gas at an outlet of a mixing chamber in the furnace smoke dryer, coal separated from a coal outlet at the lower part of the furnace smoke dryer and coal separated from a cyclone separator enter a screw feeder together, the coal enters a coal mill through the screw feeder, and ground coal dust is carried by primary hot air and enters a hearth for combustion through a boiler burner;
after being heated by the air heater, the cold air enters the boiler air preheater to be continuously preheated, and is used as boiler combustion air;
the cooling medium of the water taking heat exchanger is provided by a unit condensation water system, and water condensed on the flue gas side of the water taking heat exchanger is used as power plant makeup water after being treated, so that the power plant makeup water quantity can be greatly reduced; and the tail smoke of the boiler is discharged to the atmosphere through a chimney after passing through a low-temperature economizer, a dust remover, an induced draft fan and a desulfurizing tower in sequence.
Claims (2)
1. The utility model provides a raw coal drying system before coal pulverizer before retrieving heat and extracting moisture in coal, includes raw coal bunker, feeder, stove cigarette desiccator, screw feeder, coal gate, cyclone, exhaust fan, mixing chamber, high temperature stove cigarette take out mouth, low temperature economizer, air-cooler, heater, water intaking heat exchanger, regulating gate, division gate, its characterized in that: the flue gas dryer is connected with a flue outlet of the mixing chamber, the flue inlet of the mixing chamber is respectively communicated with a high-temperature flue gas suction port and a rear flue of the dust remover, and an air cooler is arranged between the mixing chamber and the rear flue of the dust remover;
the coal outlet of the furnace smoke dryer is connected with the inlet of the screw feeder, the exhaust gas outlet of the furnace smoke dryer is connected with the exhaust gas inlet of the cyclone separator, and the solid phase outlet of the cyclone separator is connected with the inlet of the screw feeder; the flue gas outlet of the cyclone separator is connected with the inlet of the heater through a ventilation air fan;
the outlet of the screw feeder is connected with a coal mill, a coal gate is arranged between the screw feeder and the coal mill, and the coal mill is connected with a boiler burner;
the air inlet of the air heater is communicated with the cold air outlet, the air outlet of the air heater is connected with the inlet of the air preheater of the boiler through a primary fan, and the outlet of the air preheater is connected with the coal mill;
the exhaust gas outlet of the air heater is connected with the exhaust gas inlet of the water taking heat exchanger, the exhaust gas outlet flue of the water taking heat exchanger is divided into two paths, and one path is connected with the air inlet of the boiler burner; the other path of the water pipe is connected with a coal mill, and an adjusting door and an isolating door are arranged in the middle;
the water taking heat exchanger is respectively provided with a condensed water inlet, a condensed water outlet and a water recovery port, the condensed water is provided by a condensation water system of the generator set, and the water recovered by the water taking heat exchanger is used as the power plant makeup water.
2. The pre-mill raw coal drying system for recovering heat and extracting moisture from coal as claimed in claim 1, wherein: the high-temperature furnace smoke inlet is arranged below the furnace smoke dryer, and the drying mode adopts a back blowing mode.
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| Application Number | Priority Date | Filing Date | Title |
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| 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 |
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| Application Number | Priority Date | Filing Date | Title |
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| 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 |
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| CN107036432A CN107036432A (en) | 2017-08-11 |
| CN107036432B true CN107036432B (en) | 2023-07-14 |
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