CN103807868B - Be applicable to the internal heating fluidized bed drying system of brown coal air cooling turbo-generator - Google Patents
Be applicable to the internal heating fluidized bed drying system of brown coal air cooling turbo-generator Download PDFInfo
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- CN103807868B CN103807868B CN201410090978.1A CN201410090978A CN103807868B CN 103807868 B CN103807868 B CN 103807868B CN 201410090978 A CN201410090978 A CN 201410090978A CN 103807868 B CN103807868 B CN 103807868B
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Abstract
The invention discloses a kind of internal heating fluidized bed drying system being applicable to brown coal air cooling turbo-generator belonging to power station energy-saving field.In brown coal air cooling turbo-generator, coal bunker is fixed on above belt of weighing, the internal heating fluidized bed drying machine set up between belt and coal pulverizer with built-in heat exchanger of weighing.The hot-air utilizing Air-Cooling Island to export is as fluidisation and drying medium, and the part steam discharge of steam turbine main body is as drying source.Drying machine gas vent is provided with deduster, and dry pulverized coal and the drying machine of recovery export coal dust and mix, and is sent to coal pulverizer and continues grinding; Condensate water in dry run enters backheat heating unit.The present invention utilizes the heated air drying brown coal of Air-cooled Unit steamer exhausted spare heat and Air-Cooling Island outlet, adds the energy density of brown coal, improves boiler efficiency; Significantly reduce the cold source energy of Air-cooled Unit, energy regenerating cost is low, and systematic economy is profitable simultaneously; And dry run temperature maintains lower temperature levels, security reliability is good.
Description
Technical field
The invention belongs to energy-saving equipment field, power station, particularly a kind of internal heating fluidized bed drying system being applicable to brown coal air cooling turbo-generator.
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, and boiler exhaust gas is lost larger with low moisture coal facies, the direct efficiency of combustion of boiler is lower, and economy is limited, and greenhouse gas emissions are also larger.In addition, high water content brown coal calorific value is lower, makes boiler body bulky, and boiler accessory machinery capacity is also bigger than normal, considerably increases power station investment and station service power consumption rate.
At present, for the problems referred to above, independently brown coal drying system is usually set in thermal power plant and brown coal is carried out dry in advance, the water content of brown coal is reduced to a certain degree, then brown coal are transported in boiler and carry out burning and generating electricity.The mode of brown coal drying can be divided into flue gas drying, superheat steam drying, air oxygen detrition substantially by drying medium difference, and the above two all need to consume a large amount of high-grade flue gas or superheated steam, are thus unfavorable for the raising of unit efficiency.In recent years, air oxygen detrition because of its baking temperature low, drying medium is cheap and easy to get and cause the concern of numerous research institution.U.S. CleanCoalPowerInitiative (CCPI) group proposes, and 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, drying source (water) is heated, make power plant efficiency improve 2 ?4 percentage points.
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 limit by unfavorable geographical conditions such as droughts, newly build a power station and adopt Air-cooled Unit more in above-mentioned area, Air-cooled Unit is using surrounding air as the cooling medium of turbine discharge, Air-Cooling Island outlet hot-air (45 DEG C ~ 50 DEG C), exhaust steam pressure 15kpa ~ 35kpa, exhaust steam adiabatic condensation temperature 50 DEG C ?65 DEG C, and current Air-Cooling Island outlet hot-air generally directly enters air, both caused a large amount of cold source energies, again certain thermal pollution had been created to environment.
If can in conjunction with the feature of Air-cooled Unit, utilize Air-Cooling Island hot-air, turbine low pressure cylinder steam discharge design be directed to the low power consuming of brown coal Air-cooled Unit electricity generation system, Low investment drying system, then be expected to the thermodynamics and the economics performance that improve brown coal Air-cooled Unit drying system further, 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 being applicable to brown coal air cooling turbo-generator, it is characterized in that, in brown coal air cooling turbo-generator, coal bunker 5 is fixed on above belt 6 of weighing, to weigh the internal heating fluidized bed drying machine 8 set up between belt 6 and coal pulverizer 9 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 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 air, , 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 are connected successively with steam turbine 2,
An aspiration channel 16 is evenly arranged between the every two row's gland steam exhausters 15 in air cooling platform top of described Air-Cooling Island, aspiration channel 16 is parallel with turbine discharge pipe 15, each aspiration channel 16 all imports main air supply duct 17, main air supply duct 17 is provided with blower fan 10, blower fan 10 and internal heating fluidized bed drying machine 8 lower gas spout connection.
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 DEG C ~ 65 DEG C, steam discharge is condensation heat in built-in heat exchanger, moisture in coal dust is evaporated, converge with the main condensate from Air-Cooling Island 12 after the hydrogenesis of evaporation, enter backheat heating unit 14, boiler 1 and steam turbine 2 successively through condensate pump 13.
The drying of described internal heating fluidized bed drying machine 8 and fluidizing agent are that part Air-Cooling Island 12 exports hot-air, 3% of this part outlet hot-air duty cool island outlet hot-air total amount, temperature is 45 DEG C ~ 50 DEG C, 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 with coal dust and form fluidized state and take away the moisture evaporated in wet coal dust, after deduster 7 through top purifies, the dry coal dust reclaimed mixes with the raw coal that internal heating fluidized bed drying machine 8 lower part outlet exports, be sent to coal pulverizer 9 and continue grinding.
The particle diameter stored in described coal bunker 5 is less than the high-moisture coal dust of 6mm by belt of weighing
6 send into internal heating fluidized bed drying machine 8, run into hot-air from bottom to top, form fluid bed form, taken away by air after moisture evaporation in coal dust, after dry the moisture of coal dust be down to 25% ?30%, dry pulverized coal is exported by internal heating fluidized bed drying machine 8 bottom, is sent to coal pulverizer 9 and continues grinding, finally send 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, boiler circuit is returned after steam discharge condensation heat, reclaim a large amount of exhaust steam residual heats, significantly reduce the cold source energy of Air-cooled Unit, decrease the exhaust steam amount of condensing in air cooling tower, make the subsidiary engine load decrease to some degree of air cooling tower.
2. extract in air cooling tower the hot-air after cooling exhaust steam 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 all take from power plant's waste discharge (working medium, energy), and do not need additional heat to input, cost recovery is low, good in economic efficiency.And whole dry run temperature maintain 55 DEG C ?within the scope of 60 DEG C, 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, raw coal moisture can reduce more originally reduced by 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, decrease 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 ensured, power station equipment investment reduces;
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the internal heating fluidized bed drying system being applicable to brown coal air cooling turbo-generator.
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;
6 ?to weigh belt; 7 ?deduster; 8 ?internal heating fluidized bed drying machine; 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 gland steam exhauster; 16 ?aspiration channel; 17 ?main air supply duct
Detailed description of the invention
The invention provides a kind of internal heating fluidized bed drying system being applicable to brown coal air cooling turbo-generator, 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 being applicable to air cooling turbo-generator.
The coal bunker 5 of this system mainly in brown coal air cooling turbo-generator, the internal heating fluidized bed drying machine 8 set up between belt 6 and coal pulverizer 9 with built-in heat exchanger of weighing, the entrance of its built-in heat exchanger is connected to the exhaust equipment of LP casing road of power station steam turbine 2, export the condensing water conduit be connected to after the Air-Cooling Island 12 of Steam-Water System in Power Plant, the sensible heat utilizing the low-quality steam discharge of part in steam turbine 2 after acting to discharge in built-in heat exchanger 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 exported with Air-Cooling Island 12 is as fluidisation, drying medium, the gas vent on internal heating fluidized bed drying machine 8 top is connected with deduster 7, the dry coal dust reclaimed through deduster 7 mixes with the raw coal that the outlet of the internal heating fluidized bed drying machine 8 of stream exports, and is sent to coal pulverizer 9 and continues grinding.Exhaust emissions after deduster 7 purifies is to air.Turbine discharge cools condensation at Air-Cooling Island 12, converges, enter backheat heating unit 14, boiler 1 and steam turbine 2 successively through condensate pump 13 with from the condensate water in internal heating fluidized bed drying machine 8 internal heater.
The thermal source of described internal heating fluidized bed drying machine 8 is from steam turbine 2 low pressure (LP) cylinder afterbody steam discharge, and its pressure is about 15kPa ~ 35kPa, and temperature is 50 DEG C ~ 65 DEG C, and steam discharge is condensation heat in built-in heat exchanger, and the moisture in coal dust is evaporated.Converge with the main condensate from Air-Cooling Island 12 after the hydrogenesis of evaporation, enter backheat heating unit 14, boiler 1 and steam turbine 2 successively through condensate pump 13.
The drying of described internal heating fluidized bed drying machine 8 and fluidizing agent are that to export hot-air (about 3% of duty cool island outlet hot-air total amount) temperature be 45 DEG C ~ 50 DEG C to part Air-Cooling Island 12, part hot-air is flowed into from internal heating fluidized bed drying machine 8 bottom through special pipeline by flow control valve 11, blower fan 10, fully contact with coal dust and form fluidized state and take away the moisture evaporated in wet coal dust, after deduster 7 through top purifies, the dry coal dust reclaimed mixes with the raw coal that the outlet of flue gas fluid bed dryer exports, and is sent to coal pulverizer 9 and continues grinding.
The high-moisture coal dust (particle diameter is less than 6mm) be stored in coal bunker 5 sends into fluid bed dryer 8 by belt 6 of weighing, run into hot-air from bottom to top, form fluid bed form, taken away by air after moisture evaporation in coal dust, after dry the moisture as received coal of coal dust be down to 25% ?30%, dry pulverized coal is exported by fluid bed dryer 8 bottom, is sent to coal pulverizer 9 and continues grinding, finally send into hearth combustion.
Fig. 2 is that Air-Cooling Island 12 arranges partial enlarged drawing (overlooking) with the hot air delivery pipe road of fluid bed dryer 8, an aspiration channel 16 is evenly arranged between every two rows' gland steam exhauster (dotted line) 15 in air cooling platform top of described Air-Cooling Island, aspiration channel 16 is parallel with turbine discharge pipe 15, each aspiration channel 16 all imports main air supply duct 17, main air supply duct 17 is provided with blower fan 10, blower fan 10 and internal heating fluidized bed drying machine 8 lower gas spout connection; The hot-air that Air-Cooling Island 12 exports 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 cooling turbo-generator, it is characterized in that, in brown coal air cooling turbo-generator, coal bunker (5) is fixed on belt of weighing (6) top, to weigh the internal heating fluidized bed drying machine (8) set up between belt (6) and coal pulverizer (9) 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) purification is to air, 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) are connected successively with steam turbine (2).
2. be applicable to the internal heating fluidized bed drying system of brown coal air cooling turbo-generator according to claim 1, it is characterized in that, an aspiration channel (16) is evenly arranged between every two rows' gland steam exhauster (15) in air cooling platform top of described Air-Cooling Island, aspiration channel (16) is parallel with turbine discharge pipe (15), each aspiration channel (16) all imports main air supply duct (17), main air supply duct (17) is provided with blower fan (10), blower fan (10) and internal heating fluidized bed drying machine (8) lower gas spout connection.
3. be applicable to the internal heating fluidized bed drying system of brown coal air cooling turbo-generator according to claim 1, 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 DEG C ~ 65 DEG C, steam discharge is condensation heat in built-in heat exchanger, moisture in coal dust is evaporated, converge with the main condensate from Air-Cooling Island (12) after the hydrogenesis of evaporation, backheat heating unit (14) is entered successively through condensate pump (13), boiler (1) and steam turbine (2).
4. be applicable to the internal heating fluidized bed drying system of brown coal air cooling turbo-generator according to claim 1, it is characterized in that, the drying of described internal heating fluidized bed drying machine (8) and fluidizing agent are part Air-Cooling Island (12) outlet hot-air, 3% of this part outlet hot-air duty cool island outlet hot-air total amount, temperature is 45 DEG C ~ 50 DEG C, 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 with coal dust and form fluidized state and take away the moisture evaporated in wet coal dust, after deduster (7) purification through top, the dry coal dust reclaimed mixes with the raw coal that internal heating fluidized bed drying machine (8) lower part outlet exports, be sent to coal pulverizer (9) and continue grinding.
5. be applicable to the internal heating fluidized bed drying system of brown coal air cooling turbo-generator according to claim 1, it is characterized in that, the high-moisture coal dust that the particle diameter stored in described coal bunker (5) is less than 6mm sends into internal heating fluidized bed drying machine (8) by belt of weighing (6), run into hot-air from bottom to top, form fluid bed form, taken away by air after moisture evaporation in coal dust, 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 grinding, finally send into hearth combustion.
6. be applicable to the internal heating fluidized bed drying system of brown coal air cooling turbo-generator according to claim 1, it 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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| 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 |
| 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 |
| 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 |
| CN105674689B (en) * | 2016-01-19 | 2018-03-13 | 四川大学 | Multi-stage series drying process is got wet using the alternating temperature of industrial smoke waste heat |
| 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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| DE3644806C1 (en) * | 1986-12-31 | 1993-05-13 | Rheinische Braunkohlenw Ag | Process and plant for drying crude lignite in a fluidized-bed dryer |
| CN101581533B (en) * | 2009-06-04 | 2010-10-06 | 山东天力干燥设备有限公司 | Device for pre-drying lignite through overheated steam and process thereof |
| CN101881191B (en) * | 2010-05-27 | 2012-10-17 | 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 |
| CN103575068B (en) * | 2013-11-30 | 2015-03-25 | 河北联合大学 | Lignite drying water recycling and drying tail gas recycling system |
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