CN104566431A - Low-temperature drying and coal conveying integrated equipment for raw coal - Google Patents
Low-temperature drying and coal conveying integrated equipment for raw coal Download PDFInfo
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- CN104566431A CN104566431A CN201410784177.5A CN201410784177A CN104566431A CN 104566431 A CN104566431 A CN 104566431A CN 201410784177 A CN201410784177 A CN 201410784177A CN 104566431 A CN104566431 A CN 104566431A
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Abstract
The invention discloses low-temperature drying and coal conveying integrated equipment for raw coal and belongs to the field of raw coal drying equipment. In a coal conveying room, a double-layer closed space is formed by an equipment outer shell and an equipment inner shell, air introduction pipelines are connected with the drying equipment inner shell, first water medium heaters are arranged at junctions of the air introduction pipelines and the drying equipment inner shell, a supporting structure, a second water medium heater and a rotating shaft are sequentially arranged inside a crawler from top to bottom, and thus, the low-temperature drying and coal conveying integrated equipment for the raw coal is formed; an outlet of the low-temperature drying and coal conveying integrated equipment is connected with a coal bunker, and external moisture drying for lignite, sub-bituminous coal and bituminous coal is completed while coal granules are conveyed; air drying tail gas is conveyed to chimneys with baffles through an air pipeline and then is exhausted into the atmosphere. According to the low-temperature drying and coal conveying integrated equipment for the raw coal, disclosed by the invention, the external moisture drying for the raw coal (lignite, sub-bituminous coal and bituminous coal) can be completed by using low-temperature drying heat sources of different types while the coal granules are conveyed, so that the efficiency of an electric power plant is increased.
Description
Technical field
The invention belongs to raw coal drying device field, particularly a kind of raw coal low temperature drying and defeated coal integration apparatus.
Background technology
The feature of the fossil fuel reserves of China is " rich coal, oil-poor, weak breath ", this feature determines the general layout of Chinese primary energy production and consumption structure in a long time based on coal and can not change, data statistics shows, by the end of the year 2013, coal fired power generation installed capacity has reached 8.17 hundred million kilowatts, annual electricity generating capacity reaches 3.94 trillion kilowatt hours, and still remain the growth rate of annual 3000-4000 ten thousand kilowatts of installed capacitys in recent years.On the other hand, the discharge capacity of the major pollutants such as dust, SO2, NOx of coal-burning power plant accounts for 12.20%, 42.16% and 41.59% of national total release respectively.Therefore, coal fired power plant unit operation efficiency is improved further significant with the whole pollution reduction work of reduction for guarantee Chinese energy safety.
In recent years, " fire coal energy-saving emission-reducing upgrading and transformation action plan 2014-2020 " that National Development and Reform Committee, Chinese Ministry of Environmental Protection, ministries and commissions of National Energy Board three issue explicitly points out, new-built unit powers mark coal lower than 300 grams/kilowatt hour, and this proposes huge challenge to China's power industry.Current, the means that mainly develop skill, for improving loop parameter, improve unit operation level, but from fuels sources cephalomere energy, not yet carry out correlative study.In the coal mill system of current employing, the moisture in coal all enters hearth combustion with boiler air-supply.The existence of combustion moisture in coal can reduce its low heat valve, also limit the exhaust gas temperature of boiler simultaneously, because this reducing coal-fired utilization ratio.In addition, the moisture in coal can directly affect coal pulverizer power consumption.Therefore, it is very favourable that the moisture adopting suitable form reduction to enter the coal of coal pulverizer reduces energy consumption further to coal unit.
In recent years, low temperature drying technology also more and more obtains the attention of scholars, as Clean CoalPower Initiative (CCPI) group of the U.S. proposes a kind of fluidized bed drying equipment, it utilizes the cooling water in cooling tower to add hot-air, dry raw coal is carried out using air as drying medium, effectively reduce the moisture of brown coal, generating efficiency also improves thereupon.
As everyone knows, China's major impetus coal be bituminous coal, meager coal, its moisture generally at 3%-15%, as bituminous coal (3 ~ 18%); Meager coal (4 ~ 8%); Wash coal (7 ~ 9%) and in moisture, free surface moisture is master contract is 70%-80%; In addition, due to influence factors such as climatic environments, as: our south is bigger than normal near the power station environment humidity of water system, and in coal, water content is general higher.Research and analyse and show, the free surface moisture of 80-90% is removed in low temperature drying (40-50 DEG C) in theory, according to different parameters unit, adopts predrying reduction of raw coal to mark coal consumption 1.5-3g/kWh.And low temperature can exist as boiler exhaust gas, condenser recirculated water, air cooling island of air cooling unit hot blast etc. in power plant in a large number with waste heat.Therefore, find suitable equipment, manage to reclaim low temperature exhaust heat, utilize its predrying raw coal, have important meaning to coal unit.
Summary of the invention
The object of this invention is to provide a kind of raw coal low temperature drying and defeated coal integration apparatus, it is characterized in that,
Double-layer seal space is formed by device housings 2 and equipment inner casing 10 in defeated bordroom 1, air is introduced pipeline 3 and is connected with drying equipment inner casing 2, interface is furnished with the first hydrophily formula heater 11, the inside of crawler belt 6 is furnished with supporting construction 8, second hydrophily formula heater 9 and turning cylinder 7 from top to bottom successively, composition raw coal low temperature drying and defeated coal integration apparatus; Below crawler belt, be furnished with auxiliary coal conveyer belt 12; Cyclone separator 4 interval is fixed on drying equipment inner casing 2 wall, and the chimney 5 that cyclone separator 4 is blocked by air duct and the band being fixed on defeated bordroom 1 end face is connected.
Described air is introduced pipeline and is connected with drying equipment inner casing; Air is introduced pipeline hollow gas and is sent into by blower fan; Second hydrophily formula heater 9 is that many row's coiled pipes are arranged, air enters drying equipment after the second hydrophily formula heater 9 is heated to 30 ~ 50 DEG C.
Described supporting construction is in net distribution below crawler belt, and supporting construction 8 both sides are fixed on device housings 2 inwall, arranges sealing backplate 13 above supporting construction 8 steel plate of crawler belt 6 both sides.
The first water coal formula heater 11 below described supporting construction 8 is for how row's coiled pipe is arranged in parallel, and Temperature of Working scope is 50 ~ 60 DEG C, adds hot-air to 45 ~ 55 DEG C, directly heats the coal particle on crawler belt 6.
Described raw coal low temperature drying is connected with coal bunker with the outlet of defeated coal integration apparatus, while conveying coal particle, completes free surface moisture drying to brown coal, ub-bituminous coal and bituminous coal.
The air that described air introducing pipeline 3 is introduced passes on the downside of crawler belt 6, on the upside of power transmission shaft 7, second hydrophily formula heater 9, supporting construction 8, crawler belt 6 from bottom to top after the first water coal formula heater 11, coal seam, thus drying is carried out to coal particle, dried tail gas, after cyclone separator 4 is separated, is sent into after the chimney 5 be with and blocked through air duct and is entered air.
Described crawler belt 6 arranged beneath assists coal conveyer belt 12, for the broken coal that carry coal drops from crawler belt 6.
Beneficial effect of the present invention is can the power station energy-saving equipment of the dry raw coal free surface moisture of efficiency utilization power plant low temperature exhaust heat.Dissimilar low temperature drying thermal source is selected according to different power station, by reclaiming the abundant low temperature exhaust heat of coal fired power plant, pre-dried is carried out to raw coal free surface moisture, thus significantly reduce raw coal free surface moisture content, improve raw coal calorific value, and reduce boiler exhaust gas heat loss, improve coal-fired utilization ratio, and then improve the generating efficiency of power plant.Initial analysis shows this invention to be applied to the in-service 600MW supercritical unit of China, for the raw coal (7%-11%) of different in moisture content, coal consumption of power supply reduction is about 1.6g/kWh ~ 2.9g/kWh, during for 300MW subcritical and 1000MW supercritical unit, the raw coal (7%-11%) of different in moisture content, coal consumption of power supply reduction is about 1.7g/kWh ~ 3.0g/kWh, 1.5g/kWh ~ 2.8g/kWh respectively.
Accompanying drawing explanation
Fig. 1 is raw coal low temperature drying and defeated coal integration apparatus schematic diagram.
Fig. 2 is raw coal low temperature drying and defeated coal integration apparatus lateral plan.
Fig. 3 is the hydrophily formula heater arrangement schematic diagram under defeated coal crawler belt.
Fig. 4 crawler belt supported underneath structure partial view.
Fig. 5 is raw coal low temperature drying and defeated coal integration apparatus integral layout schematic diagram.
In figure: 1 be defeated bordroom, 2 be device housings, 3 to introduce pipeline, 4 for air be cyclone separator, 5 be chimney, 6 be defeated coal crawler belt, 7 be turning cylinder, 8 be supporting construction, 9 be hydrophily formula heater, 10 be equipment inner casing, 11 be hydrophily formula heater, 12 be auxiliary coal conveyer belt, 13 be that backplate seals.
Detailed description of the invention
The invention provides a kind of raw coal low temperature drying and defeated coal integration apparatus, below in conjunction with accompanying drawing, further description is made to the present invention.
In the raw coal low temperature drying shown in Fig. 1, Fig. 2, Fig. 5 and defeated coal integration apparatus schematic diagram, double-layer seal space is formed by device housings 2 and equipment inner casing 10 in defeated bordroom 1, air is introduced pipeline 3 and is connected with drying equipment inner casing 2, and interface is furnished with the first hydrophily formula heater 11; First, second hydrophily formula heater is that many row's coiled pipes arrange (as shown in Figure 3), and in many row's coiled pipes, Temperature of Working scope is 50 ~ 60 DEG C, adds hot-air to 45 ~ 55 DEG C, directly heats the coal particle on crawler belt 6.; The inside of crawler belt 6 is furnished with supporting construction 8, second hydrophily formula heater 9 and turning cylinder 7 from top to bottom successively, composition raw coal low temperature drying and defeated coal integration apparatus, and crawler belt 6 end of integration apparatus outlet is connected with coal bunker; Below crawler belt, be furnished with auxiliary coal conveyer belt 12, for the broken coal that transport track drops; Cyclone separator 4 interval is fixed on drying equipment inner casing 2 wall, and the chimney 5 that cyclone separator 4 is blocked by air duct and the band being fixed on defeated bordroom 1 end face is connected; The crawler belt 6 of defeated coal drives turning cylinder 7 to rotate by motor, thus completes the course of conveying of coal particle.
Raw coal low temperature drying and defeated coal integration apparatus operate in this confined space; The air that air introduces pipeline 3 is sent into by blower fan, after the first water coal formula heater 11 from bottom to top through on the downside of crawler belt 6, on the upside of power transmission shaft 7, second hydrophily formula heater 9, supporting construction 8, crawler belt 6, coal seam, thus drying is carried out to coal particle, air is introduced air oxygen detrition tail gas in pipeline 3 and, after cyclone separator 4 is separated, is sent into after the chimney 5 be with and blocked enter air through air duct.Wherein, air enters drying equipment after the second hydrophily formula heater 9 is heated to 30 ~ 50 DEG C.
Described supporting construction is in net distribution (as shown in Figure 4) below crawler belt, and supporting construction 8 both sides are fixed on drying equipment shell 2 inwall, arranges sealing backplate 13 above the steel plate of the supporting construction 8 of crawler belt 6 both sides.
Described raw coal low temperature drying is connected with coal bunker with the outlet of defeated coal integration apparatus, while conveying coal particle, completes free surface moisture drying to brown coal, ub-bituminous coal and bituminous coal.
Calculate through initial analysis, initial analysis shows this invention to be applied to the in-service 600MW supercritical unit of China, for the raw coal (7%-11%) of different in moisture content, coal consumption of power supply reduction is about 1.6g/kWh ~ 2.9g/kWh, during for 300MW subcritical and 1000MW supercritical unit, the raw coal (7%-11%) of different in moisture content, coal consumption of power supply reduction is about 1.7g/kWh ~ 3.0g/kWh, 1.5g/kWh ~ 2.8g/kWh respectively.
The present invention selects dissimilar low temperature drying thermal source according to different power station, by reclaiming the abundant low temperature exhaust heat of coal fired power plant, pre-dried is carried out to raw coal free surface moisture, thus raw coal (many coals such as brown coal, ub-bituminous coal, bituminous coal) free surface moisture content significantly falls, improve raw coal calorific value, and reduce boiler exhaust gas heat loss, and then improve the generating efficiency of power plant.
Claims (7)
1. a raw coal low temperature drying and defeated coal integration apparatus, it is characterized in that, double-layer seal space is formed by drying equipment shell (2) and drying equipment inner casing (10) in defeated bordroom (1), air is introduced pipeline (3) and is connected with drying equipment inner casing (2), interface is furnished with the first hydrophily formula heater (11), the inside of crawler belt (6) is furnished with supporting construction (8), the second hydrophily formula heater (9) and turning cylinder (7) from top to bottom successively, composition raw coal low temperature drying and defeated coal integration apparatus; Below crawler belt, be furnished with auxiliary coal conveyer belt (12); Cyclone separator (4) interval is fixed on drying equipment inner casing (2) wall, and the chimney (5) that cyclone separator (4) is blocked by air duct and the band being fixed on defeated bordroom (1) end face is connected.
2. raw coal low temperature drying according to claim 1 and defeated coal integration apparatus, is characterized in that, described air is introduced pipeline (3) and is connected with drying equipment inner casing (10); Air is introduced air in pipeline (3) and is sent into by blower fan; Second hydrophily formula heater (9) is that many row's coiled pipes are arranged, air enters drying equipment after the second hydrophily formula heater (9) is heated to 30 ~ 50 DEG C.
3. raw coal low temperature drying according to claim 1 and defeated coal integration apparatus, it is characterized in that, described supporting construction (8) is net distribution in crawler belt (6) below, supporting construction (8) both sides are fixed on device housings (2) inwall, arrange sealing backplate (13) above the supporting construction steel plate of crawler belt (6) both sides.
4. raw coal low temperature drying according to claim 1 and defeated coal integration apparatus, it is characterized in that, first water coal formula heater (11) of described supporting construction (8) below is for how row's coiled pipe is arranged in parallel, Temperature of Working scope is 50 ~ 60 DEG C, add hot-air to 45 ~ 55 DEG C, directly heat the coal particle on crawler belt (6).
5. raw coal low temperature drying according to claim 1 and defeated coal integration apparatus, it is characterized in that, described raw coal low temperature drying is connected with coal bunker with the outlet of defeated coal integration apparatus, while conveying coal particle, completes free surface moisture drying to brown coal, ub-bituminous coal and bituminous coal.
6. raw coal low temperature drying according to claim 1 and defeated coal integration apparatus, it is characterized in that, the air that described air introducing pipeline (3) is introduced passes crawler belt (6) downside, power transmission shaft, the second hydrophily formula heater (9), supporting construction (8), crawler belt (6) upside, coal seam from bottom to top after the first water coal formula heater (11), thus drying is carried out to coal particle, dried tail gas, after cyclone separator (4) is separated, is sent into after the chimney (5) be with and blocked through air duct and is entered air.
7. raw coal low temperature drying according to claim 1 and defeated coal integration apparatus, is characterized in that, described crawler belt (6) arranged beneath assists coal conveyer belt (12), for transporting the broken coal dropped from crawler belt (6).
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| CN201410784177.5A CN104566431B (en) | 2014-12-16 | 2014-12-16 | Low-temperature drying and coal conveying integrated equipment for raw coal |
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| CN201410784177.5A CN104566431B (en) | 2014-12-16 | 2014-12-16 | Low-temperature drying and coal conveying integrated equipment for raw coal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107401755A (en) * | 2017-08-02 | 2017-11-28 | 大唐东北电力试验研究所有限公司 | The energy conserving system of station boiler steam turbine |
| CN111322605A (en) * | 2020-03-04 | 2020-06-23 | 恒盛能源股份有限公司 | Coal-fired power generation method |
| CN113268887A (en) * | 2021-06-22 | 2021-08-17 | 西安热工研究院有限公司 | Optimal heat source determining system and method for boiler air heater of coal electric unit |
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| SU805013A1 (en) * | 1978-12-04 | 1981-02-15 | Производственное Объединение"Центрэнергоцветмет" | Solid fuel feeder |
| JPH08261650A (en) * | 1995-03-20 | 1996-10-11 | Osaka Gas Chem Kk | Perishables drier |
| CN200986375Y (en) * | 2006-11-29 | 2007-12-05 | 由智光 | Multiple layer chain heat air smoke extraction dual firing drying furnace for formed coal |
| CN102533302A (en) * | 2012-02-06 | 2012-07-04 | 无锡亿恩科技股份有限公司 | Internal heating type dryer for in-furnace coking coal dehumidification |
| CN103575077A (en) * | 2013-11-07 | 2014-02-12 | 浙江大学 | Multi-layer belt type drying system |
| CN203534081U (en) * | 2013-10-25 | 2014-04-09 | 湖南三德科技股份有限公司 | Blowing hot air penetrating dry box |
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2014
- 2014-12-16 CN CN201410784177.5A patent/CN104566431B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| SU805013A1 (en) * | 1978-12-04 | 1981-02-15 | Производственное Объединение"Центрэнергоцветмет" | Solid fuel feeder |
| JPH08261650A (en) * | 1995-03-20 | 1996-10-11 | Osaka Gas Chem Kk | Perishables drier |
| CN200986375Y (en) * | 2006-11-29 | 2007-12-05 | 由智光 | Multiple layer chain heat air smoke extraction dual firing drying furnace for formed coal |
| CN102533302A (en) * | 2012-02-06 | 2012-07-04 | 无锡亿恩科技股份有限公司 | Internal heating type dryer for in-furnace coking coal dehumidification |
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| CN103575077A (en) * | 2013-11-07 | 2014-02-12 | 浙江大学 | Multi-layer belt type drying system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107401755A (en) * | 2017-08-02 | 2017-11-28 | 大唐东北电力试验研究所有限公司 | The energy conserving system of station boiler steam turbine |
| CN111322605A (en) * | 2020-03-04 | 2020-06-23 | 恒盛能源股份有限公司 | Coal-fired power generation method |
| CN113268887A (en) * | 2021-06-22 | 2021-08-17 | 西安热工研究院有限公司 | Optimal heat source determining system and method for boiler air heater of coal electric unit |
| CN113268887B (en) * | 2021-06-22 | 2023-03-10 | 西安热工研究院有限公司 | Optimal heat source determining system and method for boiler air heater of coal electric unit |
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| CN104566431B (en) | 2017-04-12 |
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