CN103807868A - Inner heating fluidized bed drying system applicable to brown coal air cooling generator set - Google Patents
Inner heating fluidized bed drying system applicable to brown coal air cooling generator set Download PDFInfo
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- CN103807868A CN103807868A CN201410090978.1A CN201410090978A CN103807868A CN 103807868 A CN103807868 A CN 103807868A CN 201410090978 A CN201410090978 A CN 201410090978A CN 103807868 A CN103807868 A CN 103807868A
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Abstract
The invention discloses an inner heating fluidized bed drying system applicable to a brown coal air cooling generator set and belongs to the field of power station energy conservation. In the brown coal air cooling generator set, a coal cabin is fixed above a weighting belt, and an inner heating fluidized bed dryingmachine with a built-in heat exchanger is additionally arranged between the weighting belt and a pulverizer. Hot air at an air cooling island outlet is used as a fluidizing and drying medium, part of exhaust steam of a turbine main body is used as a drying heat source. A dust remover is arranged at the air outlet of the drying machine, recovered dry pulverized coal and pulverized coal at the outlet of the drying machine are mixed and sent to the pulverizer for continued grinding; condensed water in a drying process enters into a backheating and heating unit. According to the invention, the turbine of an air cooling unit is used for discharging waste heat and hot air dried brown coal at the air cooling island outlet, so that energy intensity of the brown coal is increased, and the boiler efficiency is improved; cold source loss of the air cooling unit is reduced greatly, the energy recovering cost is low, and system economic benefits are good; temperature is maintained in a lower level during the drying process, and safety and reliability are good.
Description
Technical field
The invention belongs to energy-saving equipment field, power station, particularly a kind of internal heating fluidized bed drying system that is applicable to brown coal air cooled generator group.
Background technology
The explored lignite resource of China reaches more than 1,300 hundred million tons, accounts for 13% of national coal reserves.Brown coal are minimus coals in raw coal, and its volatile matter is generally 40%～50%, and total moisture can reach 20%～50%, and air-dried moisture is 10%～20%, and low heat valve generally only has 7～15MJ/kg.Because the moisture of brown coal own is higher, the exhaust gas volumn that burning generates is bigger than normal, makes boiler exhaust gas loss larger with low moisture coal facies, and the direct efficiency of combustion of boiler is lower, and economy is limited, and greenhouse gas emissions are also larger.In addition, high-moisture brown coal calorific value is lower, makes boiler body bulky, and boiler accessory machinery capacity is also bigger than normal, has greatly increased power station investment and station service power consumption rate.
At present, for the problems referred to above, independently brown coal drying system is conventionally set in thermal power plant brown coal are dried in advance, after making the water content of brown coal be reduced to a certain degree, then brown coal are transported to and in boiler, burn and generate electricity.It is dry that the mode of brown coal drying can be divided into flue gas drying, superheat steam drying, air substantially by drying medium difference, and the above two all need to consume a large amount of high-grade flue gases or superheated steam, thereby are unfavorable for the raising of unit efficiency.In recent years, air is dry because its baking temperature is low, and drying medium is cheap and easy to get and caused the concern of numerous research institutions.U.S. Clean Coal Power Initiative(CCPI) group's proposition, utilize the cooling water in cooling tower to add hot-air, air enters fluidized bed drying equipment as drying medium.And utilize power plant's used heat, and drying source (water) is heated, make power plant efficiency improve 2-4 percentage point.
It should be noted that, the main plant area of China's brown coal is all positioned at China three northern areas of China, and be subject to the unfavorable geographical condition restriction such as drought, newly build a power station in above-mentioned area adopts Air-cooled Unit more, the cooling medium of Air-cooled Unit using surrounding air as turbine discharge, Air-Cooling Island outlet hot-air (45 ℃～50 ℃), exhaust steam pressure 15kpa～35kpa, 50 ℃-65 ℃ of exhaust steam adiabatic condensation temperatures, and current Air-Cooling Island outlet hot-air generally directly enters atmosphere, both caused a large amount of cold source energies, again environment had been produced to certain thermal pollution.
If can be in conjunction with the feature of Air-cooled Unit, utilize Air-Cooling Island hot-air, turbine low pressure cylinder steam discharge to design to be directed to the low power consuming of brown coal Air-cooled Unit electricity generation system, low investment drying system, be expected to further improve thermodynamics and the economics performance of brown coal Air-cooled Unit drying system, for brown coal Air-cooled Unit following large-scale application reference is provided.
Summary of the invention
The object of this invention is to provide a kind of internal heating fluidized bed drying system that is applicable to brown coal air cooled generator group, it is characterized in that, in brown coal air cooled generator group, coal bunker 5 is fixed on belt 6 tops of weighing, weigh and between belt 6 and coal pulverizer 9, set up the internal heating fluidized bed drying machine 8 with built-in heat exchanger, the entrance of its built-in heat exchanger is connected to the exhaust equipment of LP casing road of power station steam turbine 2 through steam flow control valve 4, the exhaust equipment of LP casing road of power station steam turbine 2 is also connected to the Air-Cooling Island 12 of Steam-Water System in Power Plant, hot air outlet be connected with flow control valve 11, flow control valve 11 is through blower fan 10 and internal heating fluidized bed drying machine 8 lower gas spout connections, the gas vent on internal heating fluidized bed drying machine 8 tops is connected with deduster 7, deduster 7 outlet at bottoms and internal heating fluidized bed drying machine 8 outlet at bottoms are all connected to coal pulverizer 9, exhaust emissions after deduster 7 purifies is to atmosphere, , the condensing water conduit of Air-Cooling Island 12 is connected to condensate pump 13, and condensate pump 13, backheat heating unit 14, boiler 1 and steam turbine 2 are connected successively,
Between the every two row's blow-off lines 15 in air cooling platform top of described Air-Cooling Island, be evenly arranged an aspiration channel 16, air-suction duct 16 is parallel with turbine discharge pipe 15, each aspiration channel 16 all imports main air supply duct 17, on main air supply duct 17, pressure fan 10 is installed, pressure fan 10 and internal heating fluidized bed drying machine 8 lower gas spout connections.
The thermal source of described internal heating fluidized bed drying machine 8 is from steam turbine 2 low pressure (LP) cylinder afterbody steam discharges, its pressure is 15kPa～35kPa, temperature is 50 ℃～65 ℃, steam discharge is condensation heat in built-in heat exchanger, make the moisture evaporation in coal dust, evaporation hydrogenesis after with converge from the main condensate of Air-Cooling Island 12, enter successively backheat heating unit 14, boiler 1 and steam turbine 2 through condensate pump 13.
Dry and the fluidizing agent of described internal heating fluidized bed drying machine 8 is that part Air-Cooling Island 12 exports hot-air, this part outlet hot-air accounts for 3% of Air-Cooling Island outlet hot-air total amount, temperature is 45 ℃～50 ℃, part hot-air is by flow control valve 11, blower fan 10 flows into from internal heating fluidized bed drying machine 8 bottoms, fully contact and form fluidized state and take away the moisture evaporating in wet coal dust with coal dust, after the deduster 7 on top purifies, the dry coal dust reclaiming mixes with the raw coal of internal heating fluidized bed drying machine 8 lower part outlet outputs, being sent to coal pulverizer 9 continues to grind.
The particle diameter storing in described feed bin 5 is less than the high-moisture coal dust of 6mm and sends into internal heating fluidized bed drying machine 8 by the belt feeder 6 of weighing, run into hot-air from bottom to top, form fluid bed form, after moisture evaporation in coal dust, taken away by air, after dry, the moisture of coal dust is down to 25%-30%, dry pulverized coal is exported by internal heating fluidized bed drying machine 8 bottoms, is sent to coal pulverizer 9 and continues to grind, and finally sends into hearth combustion.
Described steam turbine 2 is connected with generator 3.
Beneficial effect of the present invention is:
1. by utilizing turbine low pressure cylinder part steam discharge as drying source, after steam discharge condensation heat, return to boiler circuit, reclaim a large amount of exhaust steam residual heats, significantly reduce the cold source energy of Air-cooled Unit, also reduce the exhaust steam amount of condensing in air cooling tower, made the subsidiary engine load decrease to some degree of air cooling tower.
2. extract the hot-air after cooling exhaust steam in air cooling tower and, as dry and fluidizing agent, in fluid bed, make coal dust form fluidized state, take away the moisture of evaporation simultaneously; Utilize Air-cooled Unit turbine discharge as drying source; Drying source, drying medium are all taken from power plant's waste discharge (working medium, energy), do not need additional heat input, and cost recovery is low, good in economic efficiency.And whole dry run temperature maintains within the scope of 55 ℃-60 ℃, there is good safe controllability.
3. integrated drying system in original pulverized coal preparation system, utilize Air-cooled Unit part steam discharge condensation heat drying brown coal in drying machine, former moisture content of coal can reduce and more originally reduce 10%-15%, the energy density of coal improves more than 10%, enter the fire coal of hearth combustion through preheating moisture minimizing simultaneously, not only be conducive to the smooth combustion of coal, also reduced the flue gas loss of boiler, the efficiency of boiler can improve 2%～3%; Brown coal drying after-burning moisture content of coal reduces simultaneously, and the energy density of coal improves, and boiler furnace volume reduces, and subsidiary engine is exerted oneself and guaranteed, power station equipment investment reduces;
Accompanying drawing explanation
Fig. 1 is the schematic diagram that is applicable to the internal heating fluidized bed drying system of brown coal air cooled generator group.
Fig. 2 is that partial enlarged drawing (overlooking) is arranged on the hot air delivery pipe road of Air-Cooling Island
In figure: 1-boiler; 2-steam turbine; 3-generator; 4-steam flow control valve; 5-coal bunker;
The 6-belt of weighing; 7-deduster; The internal heating fluidized bed drying machine of 8-; 9-coal pulverizer; 10-blower fan;
11-air flow rate adjustment valve; 12-Air-Cooling Island; 13-condensate pump; 14-backheat heating unit;
15-air cooling tower blow-off line; 16-air-suction duct; The main air supply duct of 17-
The specific embodiment
The invention provides a kind of internal heating fluidized bed drying system that is applicable to brown coal air cooled generator group, below in conjunction with the drawings and specific embodiments, native system operation principle is described further.
Figure 1 shows that the schematic diagram of the internal heating fluidized bed brown coal drying system that is applicable to air cooled generator group.
This system mainly the coal bunker 5 in brown coal air cooled generator group, weigh and between belt 6 and coal pulverizer 9, set up the internal heating fluidized bed drying machine 8 with built-in heat exchanger, the entrance of its built-in heat exchanger is connected to the exhaust equipment of LP casing road of power station steam turbine 2, outlet is connected to the condensing water conduit after the Air-Cooling Island 12 of Steam-Water System in Power Plant, utilizes the low-quality steam discharge of part after acting discharges in built-in heat exchanger in steam turbine 2 sensible heat and the dry coal dust of the latent heat of vaporization.The bottom of internal heating fluidized bed drying machine 8 is connected to the hot air outlet of Air-Cooling Island 12 by special pipeline, the part hot-air exporting with Air-Cooling Island 12 is as fluidisation, drying medium, the gas vent on internal heating fluidized bed drying machine 8 tops is connected with deduster 7, the dry coal dust reclaiming through deduster 7 mixes with the raw coal of the outlet output of the internal heating fluidized bed drying machine 8 of stream, is sent to coal pulverizer 9 and continues to grind.Exhaust emissions after deduster 7 purifies is to atmosphere.Turbine discharge condenses Air-Cooling Island 12 is cooling, and converges from the condensate water in internal heating fluidized bed drying machine 8 internal heaters, enters successively backheat heating unit 14, boiler 1 and steam turbine 2 through condensate pump 13.
The thermal source of described internal heating fluidized bed drying machine 8 is from steam turbine 2 low pressure (LP) cylinder afterbody steam discharges, and its pressure is about 15kPa～35kPa, and temperature is about 50 ℃～65 ℃, and steam discharge is condensation heat in built-in heat exchanger, makes the moisture evaporation in coal dust.Evaporation hydrogenesis after with converge from the main condensate of Air-Cooling Island 12, enter successively backheat heating unit 14, boiler 1 and steam turbine 2 through condensate pump 13.
Dry and the fluidizing agent of described internal heating fluidized bed drying machine 8 is that part Air-Cooling Island 12 exports hot-air (accounting for 3% left and right of Air-Cooling Island outlet hot-air total amount) temperature and is about 45 ℃～50 ℃, part hot-air flows into from internal heating fluidized bed drying machine 8 bottoms through special pipeline by flow control valve 11, blower fan 10, fully contact and form fluidized state and take away the moisture evaporating in wet coal dust with coal dust, after the deduster 7 on top purifies, the dry coal dust reclaiming mixes with the raw coal of the outlet of flue gas fluid bed dryer output, is sent to coal pulverizer 9 and continues to grind.
The high-moisture coal dust (particle diameter is less than 6mm) being stored in feed bin 5 is sent into fluid bed dryer 8 by the belt feeder 6 of weighing, run into hot-air from bottom to top, form fluid bed form, after moisture evaporation in coal dust, taken away by air, after dry, the moisture as received coal of coal dust is down to 25%-30%, dry pulverized coal is exported by fluid bed dryer 8 bottoms, is sent to coal pulverizer 9 and continues to grind, and finally sends into hearth combustion.
Fig. 2 is that Air-Cooling Island 12 is arranged partial enlarged drawing (overlooking) with the hot air delivery pipe road of fluid bed dryer 8, between the every two row's blow-off lines (dotted line) 15 in air cooling platform top of described Air-Cooling Island, be evenly arranged an aspiration channel 16, air-suction duct 16 is parallel with turbine discharge pipe 15, each aspiration channel 16 all imports main air supply duct 17, on main air supply duct 17, pressure fan 10 is installed, pressure fan 10 and internal heating fluidized bed drying machine 8 lower gas spout connections; The hot-air that Air-Cooling Island 12 is exported is sent to internal heating fluidized bed drying machine 8.
Claims (6)
1. one kind is applicable to the internal heating fluidized bed drying system of brown coal air cooled generator group, it is characterized in that, in brown coal air cooled generator group, coal bunker (5) is fixed on the belt of weighing (6) top, weigh and between belt (6) and coal pulverizer (9), set up the internal heating fluidized bed drying machine (8) with built-in heat exchanger, the entrance of its built-in heat exchanger is connected to the exhaust equipment of LP casing road of power station steam turbine (2) through steam flow control valve (4), the exhaust equipment of LP casing road of power station steam turbine (2) is also connected to the Air-Cooling Island (12) of Steam-Water System in Power Plant, the hot air outlet of Air-Cooling Island (12) is connected with flow control valve (11), flow control valve (11) is through blower fan (10) and internal heating fluidized bed drying machine (8) lower gas spout connection, the gas vent on internal heating fluidized bed drying machine (8) top is connected with deduster (7), deduster (7) outlet at bottom and internal heating fluidized bed drying machine (8) outlet at bottom are all connected to coal pulverizer (9), exhaust emissions after deduster (7) purifies is to atmosphere, the condensing water conduit of Air-Cooling Island (12) is connected to condensate pump (13), and condensate pump (13), backheat heating unit (14), boiler (1) and steam turbine (2) are connected successively.
2. be applicable to according to claim 1 the internal heating fluidized bed drying system of brown coal air cooled generator group, it is characterized in that, between the every two row's blow-off lines (15) in air cooling platform top of described Air-Cooling Island, be evenly arranged an aspiration channel (16), air-suction duct (16) is parallel with turbine discharge pipe (15), each aspiration channel (16) all imports main air supply duct (17), pressure fan (10) is installed on main air supply duct (17), pressure fan (10) and internal heating fluidized bed drying machine (8) lower gas spout connection.
3. be applicable to according to claim 1 the internal heating fluidized bed drying system of brown coal air cooled generator group, it is characterized in that, the thermal source of described internal heating fluidized bed drying machine (8) is from steam turbine (2) low pressure (LP) cylinder afterbody steam discharge, its pressure is 15kPa～35kPa, temperature is 50 ℃～65 ℃, steam discharge is condensation heat in built-in heat exchanger, make the moisture evaporation in coal dust, evaporation hydrogenesis after with converge from the main condensate of Air-Cooling Island (12), enter successively backheat heating unit (14), boiler (1) and steam turbine (2) through condensate pump (13).
4. be applicable to according to claim 1 the internal heating fluidized bed drying system of brown coal air cooled generator group, it is characterized in that, dry and the fluidizing agent of described internal heating fluidized bed drying machine (8) is part Air-Cooling Island (12) outlet hot-air, this part outlet hot-air accounts for 3% of Air-Cooling Island outlet hot-air total amount, temperature is 45 ℃～50 ℃, part hot-air is by flow control valve (11), blower fan (10) flows into from internal heating fluidized bed drying machine (8) bottom, fully contact and form fluidized state and take away the moisture evaporating in wet coal dust with coal dust, after the deduster (7) on top purifies, the dry coal dust reclaiming mixes with the raw coal of internal heating fluidized bed drying machine (8) lower part outlet output, being sent to coal pulverizer (9) continues to grind.
5. be applicable to according to claim 1 the internal heating fluidized bed drying system of brown coal air cooled generator group, it is characterized in that, the particle diameter storing in described feed bin (5) is less than the high-moisture coal dust of 6mm and sends into internal heating fluidized bed drying machine (8) by the belt feeder of weighing (6), run into hot-air from bottom to top, form fluid bed form, after moisture evaporation in coal dust, taken away by air, after dry, the moisture of coal dust is down to 25%-30%, dry pulverized coal is exported by internal heating fluidized bed drying machine (8) bottom, be sent to coal pulverizer (9) and continue to grind, finally send into hearth combustion.
6. the internal heating fluidized bed drying system that is applicable to according to claim 1 brown coal air cooled generator group, is characterized in that, described steam turbine (2) is connected with generator (3).
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| CN201410090978.1A CN103807868B (en) | 2014-03-12 | 2014-03-12 | Be applicable to the internal heating fluidized bed drying system of brown coal air cooling turbo-generator |
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| CN201410090978.1A CN103807868B (en) | 2014-03-12 | 2014-03-12 | Be applicable to the internal heating fluidized bed drying system of brown coal air cooling turbo-generator |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104500158A (en) * | 2014-12-02 | 2015-04-08 | 中国矿业大学 | Low-concentration coalbed methane or gas electric generating system |
| CN104534850A (en) * | 2014-12-15 | 2015-04-22 | 华北电力大学 | Raw coal low-temperature pre-drying system and method using flue gas and waste steam waste heat |
| CN105157398A (en) * | 2015-07-13 | 2015-12-16 | 华北电力大学 | Two-stage raw coal drying system and method applied to air cooling unit |
| CN105674689A (en) * | 2016-01-19 | 2016-06-15 | 四川大学 | Temperature-variable humidity-variable multi-segment series drying process utilizing industrial flue gas waste heat |
| CN106052308A (en) * | 2016-06-15 | 2016-10-26 | 成都昊特新能源技术股份有限公司 | Drying system and drying method utilizing steam turbine waste steam |
| CN106197065A (en) * | 2016-08-31 | 2016-12-07 | 吉林省电力科学研究院有限公司 | A kind of Direct Air-Cooled tower residual heat using device |
| CN112460572A (en) * | 2020-11-23 | 2021-03-09 | 西安热工研究院有限公司 | Method and system for utilizing high-moisture lignite |
| CN113074408A (en) * | 2021-05-14 | 2021-07-06 | 西安热工研究院有限公司 | Air system and method for loss application of cold end of air cooling unit |
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| CN101881191A (en) * | 2010-05-27 | 2010-11-10 | 中国电力工程顾问集团公司 | Thermal power generation system based on high-moisture lignite pre-drying upgrading and recovering technology |
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| DE3644806C1 (en) * | 1986-12-31 | 1993-05-13 | Rheinische Braunkohlenw Ag | Process and plant for drying crude lignite in a fluidized-bed dryer |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104500158A (en) * | 2014-12-02 | 2015-04-08 | 中国矿业大学 | Low-concentration coalbed methane or gas electric generating system |
| CN104500158B (en) * | 2014-12-02 | 2016-09-07 | 中国矿业大学 | A kind of low concentration coal-bed gas or gas electricity system |
| CN104534850A (en) * | 2014-12-15 | 2015-04-22 | 华北电力大学 | Raw coal low-temperature pre-drying system and method using flue gas and waste steam waste heat |
| CN104534850B (en) * | 2014-12-15 | 2016-08-17 | 华北电力大学 | A kind of predrying system and method for raw coal low temperature utilizing flue gas, exhaust steam used heat |
| CN105157398A (en) * | 2015-07-13 | 2015-12-16 | 华北电力大学 | Two-stage raw coal drying system and method applied to air cooling unit |
| CN105157398B (en) * | 2015-07-13 | 2018-05-25 | 华北电力大学 | It is a kind of suitable for the two-stage raw coal drying system of air cooling unit and raw coal drying means |
| CN105674689A (en) * | 2016-01-19 | 2016-06-15 | 四川大学 | Temperature-variable humidity-variable multi-segment series drying process utilizing industrial flue gas waste heat |
| CN106052308A (en) * | 2016-06-15 | 2016-10-26 | 成都昊特新能源技术股份有限公司 | Drying system and drying method utilizing steam turbine waste steam |
| CN106052308B (en) * | 2016-06-15 | 2018-11-13 | 成都昊特新能源技术股份有限公司 | A kind of drying system and drying means using steam turbine steam exhaust |
| CN106197065A (en) * | 2016-08-31 | 2016-12-07 | 吉林省电力科学研究院有限公司 | A kind of Direct Air-Cooled tower residual heat using device |
| CN112460572A (en) * | 2020-11-23 | 2021-03-09 | 西安热工研究院有限公司 | Method and system for utilizing high-moisture lignite |
| CN113074408A (en) * | 2021-05-14 | 2021-07-06 | 西安热工研究院有限公司 | Air system and method for loss application of cold end of air cooling unit |
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