CN205482289U - Raw coal steam drying system of power plant suitable for operate in a variable working condition - Google Patents
Raw coal steam drying system of power plant suitable for operate in a variable working condition Download PDFInfo
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- CN205482289U CN205482289U CN201620070750.0U CN201620070750U CN205482289U CN 205482289 U CN205482289 U CN 205482289U CN 201620070750 U CN201620070750 U CN 201620070750U CN 205482289 U CN205482289 U CN 205482289U
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Abstract
The utility model discloses a raw coal steam drying system of power plant suitable for operate in a variable working condition who belongs to the energy -conserving field in power station. Partial components such as rotating -barrel desiccator are mainly returned by boiler, steam turbine, condenser, backheat heating unit, generator, control valve, ejector, blender, steam by this system. During the unit operate in a variable working condition of high -moisture coal, the raw coal is sent into steam and is returned the rotating -barrel desiccator after the coal breaker breakage in using, and steam returns the rotating -barrel desiccator and can choose different steam turbine low pressure through the switch of control valve and draw gas as the dry heat source of raw coal according to the different operating load of unit. Raw coal behind the intensive drying grinds through the coal pulverizer sends into the boiler combustion. The utility model discloses an extract different steam turbine low pressure and draw gas, produce when satisfying steam turbine operate in a variable working condition with desiccator assorted heat source, make full use of the low -grade energy of power plant, can reduce the moisture into the stove coal by a wide margin to improve the combustion efficiency of boiler under the difference load, and then improve the unit generating efficiency.
Description
Technical field
This utility model relates to a kind of raw coal drying system, particularly to a kind of power plant's raw coal steam drying system being applicable to variable parameter operation.
Background technology
The feature of the fossil fuel reserves of " rich coal, gas oil-poor, few " determines China's primary energy production and consumption structure general layout in a long time based on coal and will not change.Showing according to the data of National Energy Board's statistics, from 2000 to 2014 years, China's installation rose to 13.6 hundred million kilowatts from 300,000,000 kilowatts, and generated energy rises to 5.4638 trillion kilowatt hours from 1.313 trillion kilowatt hours, has the most reached the world the first；Wherein, thermoelectricity (mostly coal electricity) installation and generated energy then respectively reach 9.16 hundred million kilowatts and 4.1731 trillion kilowatt hours, and thermoelectricity is by the leading position in some time Nei Zhan China's power industry；Therefore China's coal fired power generation total energy approach level is improved significant for the energy sustainable development of China.And the constant tension of coal electricity supply in recent years, along with the bituminous coal depletion rate of central and east high-energy grade is accelerated, increasing power plant uses or mixes burning and comes from Inner Mongol, Xinjiang and the ub-bituminous coal etc. from external import, the raw coal water content of a lot of power plant is generally at 10 ~ 15 %, and part is up to 20 more than %.And the boiler higher moisture coal that directly burns will cause flame temperature to reduce, flue gas loss increases, and boiler efficiency declines.When the raw coal that coal fired power plant use moisture is high, need to use bigger more expensive boiler just can substantially reduce or avoid power plant's nominal output to reduce.Visible raw coal is difficult to the prescription meeting power plant to coal without upgrading dry processing.
Currently, for higher moisture raw coal, in order to improve the utilization ratio of higher moisture raw coal, currently mainly use coal fired power plant low grade residual heat resource (boiler exhaust gas, extracted steam from turbine, turbine discharge etc.) it is dried the moisture in raw coal, common raw coal drying system is the most all adapted to unit nominal operating conditions, unit drying machine requirement to thermal source when variable parameter operation cannot be met, also result in when other load operation the amount of drawing gas needed for drying machine big, cause the problems such as unit operation efficiency is low.The utility model proposes a kind of power plant's raw coal steam drying system being adapted to variable parameter operation, the drying machine requirement to thermal source under different load can be met, the fully low-grade energy of Appropriate application power plant, it is effectively improved the efficiency of burning raw coal unit, reduce the greenhouse gas emission of burning raw coal unit, there is important theoretical and practical significance.
Summary of the invention
At this utility model for when using the unit variable parameter operation of higher moisture coal, drying source cannot meet drying machine requirement and the problem such as cause the loss of part low-grade energy, unit efficiency low, propose a kind of to can adapt to the power plant's raw coal steam drying system in variable parameter operation, the problem that can effectively solve variable parameter operation, adequately and reasonably utilize power plant's low-grade energy, thus improve raw coal utilization rate, reduce boiler exhaust gas heat loss, improve unit efficiency.
For reaching above-mentioned purpose, this utility model have employed techniques below scheme:
A kind of power plant's raw coal steam drying system being applicable to variable parameter operation, it is characterised in that this system mainly includes boiler, steam turbine, condenser, backheat heating unit, electromotor, control valve, injector, blender, steam rotary pipe drying machine；Described boiler export steam is connected with turbine inlet, and steam turbine outlet exhaust steam is connected with condenser entrance, and the steam condensed in condenser is connected with boiler inlet by backheat heating unit；Described steam turbine is also connected with electromotor, and steam drives electrical power generators by acting in steam turbine；The coal-in port of described steam rotary dryer is connected with the outlet of coal breaker, the dry tail gas of steam rotary dryer outlet is connected with cleaner unit, the gas of its outlet enters exhaust treatment system, and the solid particle of outlet with dried raw coal together, enters boiler combustion after coal pulverizer grinds；The steam-heating pipe bundle of steam tube rotary drier is connected with mixer outlet by pipeline, described mixer entrance divides two-way, lead up to pipeline and control valve is directly drawn gas with six grades and is connected, pipeline of separately leading up to is connected with injector outlet, described injector entrance is drawn gas by the Pyatyi of pipeline and control valve and steam turbine and seven grades respectively and is connected, and the steam after heat release sends back to heat regenerative system by back water pump.
The steam-heating pipe bundle of described steam tube rotary drier is connected with blender by pipeline, described mixer entrance divides two-way, lead up to pipeline and control valve is directly drawn gas with six grades and is connected, pipeline of separately leading up to is connected with injector outlet, described injector entrance is drawn gas by the Pyatyi of pipeline and control valve and steam turbine and seven grades respectively and is connected, and the steam after heat release sends back to heat regenerative system by back water pump.
Described unit is when declared working condition is run, and by opening the control valve of six grades of bleed steam pipeworks, closes Pyatyi and the control valve of seven grades, uses steam turbine six grades to draw gas and makees drying source；When shoulder load operating mode is run, five, six, seven, three grades of control valves drawn gas all are opened, and utilized Pyatyi higher pressure to draw gas after seven grades of relatively low-pressure pumping steams of injection drawn gas to mix with six grades by injector and make drying source；Unit, when underrun, is only opened the control valve that Pyatyi is drawn gas, is directly drawn gas with steam turbine Pyatyi and make drying source.
Described injector is to utilize steam turbine Pyatyi injection steam turbine seven grades of drawing gas to draw gas.
The utility model proposes and a kind of choose difference and draw gas and be adapted to power plant's raw coal steam drying system of variable parameter operation as drying source by controlling the switch of valve, the drying machine requirement to drying source when fully the low-grade heat energy of Appropriate application steam turbine meets variable parameter operation, the dried energy density of raw coal improves, boiler furnace volume reduces, subsidiary engine is exerted oneself and is ensured, power station equipment investment reduces, and economy is improved.Boiler combustion efficiency improves simultaneously, and heat loss due to exhaust gas reduces, and then improves generatine set heat efficiency, increases unit and goes out merit.
Accompanying drawing explanation
Fig. 1 is a kind of power plant's raw coal steam drying system being applicable to variable parameter operation.
In figure: 1-boiler；2-high pressure cylinder；3-intermediate pressure cylinder；4-low pressure (LP) cylinder；5-Pyatyi regenerator；Six grades of backheats of 6-its；Seven grades of regenerators of 7-；8-Pyatyi control valve；Six grades of control valves of 9-；Seven grades of control valves of 10-；11-injector；12-blender；13-condenser；14-electromotor；15-back water pump；16-steam rotary formula drying machine；17-cleaner unit；18-coal pulverizer.
Detailed description of the invention
This utility model provides a kind of power plant's raw coal steam drying system being applicable to variable parameter operation, is described further native system operation principle with detailed description of the invention below in conjunction with the accompanying drawings.
Fig. 1 show the schematic diagram of a kind of two-stage raw coal drying system being applicable to indirect air cooling unit.
A kind of power plant's raw coal steam drying system being applicable to variable parameter operation, it is characterised in that this system mainly includes boiler, steam turbine, condenser, backheat heating unit, electromotor, control valve, injector, blender, steam rotary pipe drying machine；Described boiler export steam is connected with turbine inlet, and steam turbine outlet exhaust steam is connected with condenser entrance, and the steam condensed in condenser is connected with boiler inlet by backheat heating unit；Described steam turbine is also connected with electromotor, and steam drives electrical power generators by acting in steam turbine；The coal-in port of described steam rotary dryer is connected with the outlet of coal breaker, the dry tail gas of steam rotary dryer outlet is connected with cleaner unit, the gas of its outlet enters exhaust treatment system, and the solid particle of outlet with dried raw coal together, enters boiler combustion after coal pulverizer grinds；The steam-heating pipe bundle of steam tube rotary drier is connected with mixer outlet by pipeline, described mixer entrance divides two-way, lead up to pipeline and control valve is directly drawn gas with six grades and is connected, pipeline of separately leading up to is connected with injector outlet, described injector entrance is drawn gas by the Pyatyi of pipeline and control valve and steam turbine and seven grades respectively and is connected, and the steam after heat release sends back to heat regenerative system by back water pump.
The steam-heating pipe bundle of described steam tube rotary drier is connected with blender by pipeline, described mixer entrance divides two-way, lead up to pipeline and control valve is directly drawn gas with six grades and is connected, pipeline of separately leading up to is connected with injector outlet, described injector entrance is drawn gas by the Pyatyi of pipeline and control valve and steam turbine and seven grades respectively and is connected, and the steam after heat release sends back to heat regenerative system by back water pump.
Described unit is when declared working condition is run, and by opening the control valve of six grades of bleed steam pipeworks, closes Pyatyi and the control valve of seven grades, uses steam turbine six grades to draw gas and makees drying source；When shoulder load operating mode is run, five, six, seven, three grades of control valves drawn gas all are opened, and utilized Pyatyi higher pressure to draw gas after seven grades of relatively low-pressure pumping steams of injection drawn gas to mix with six grades by injector and make drying source；Unit, when underrun, is only opened the control valve that Pyatyi is drawn gas, is directly drawn gas with steam turbine Pyatyi and make drying source.
Described injector is to utilize steam turbine Pyatyi injection steam turbine seven grades of drawing gas to draw gas.
Its work process is: the raw coal of higher moisture enters steam rotary dryer after coal breaker is broken, and drying source is that steam turbine low-pressure draws gas.nullWhen unit declared working condition is run，Open by controlling six grades of control valves，Pyatyi and seven grades of valves close，Utilize six grades of (0.2404MPa that draw gas，196.09 DEG C) make drying source and in drying machine, raw coal is dried，When unit load is reduced to shoulder load，Unit and parameter of drawing gas reduce，Pyatyi is drawn gas when cannot meet drying machine to the requirement of drying source，Open Pyatyi and seven grades of control valves，Drawn gas (0.615MPa by Pyatyi，302.6 DEG C) utilize seven grades of (0.0806MPa that draw gas of injector injection，93.7℃)，Draw gas mixing in blender and six grades after injection，Enter drying machine and make drying source，When load is further decreased to underrun，Unit and parameter of drawing gas reduce further，Mixed vapour cannot meet the drying machine requirement to drying source，Now close six grades and seven grades of control valves，Draw gas (0.615MPa only with Pyatyi，302.6 DEG C) do drying source and be dried raw coal，Become hydrophobic after steam heat release，Being sent back to by back water pump can hot systems，It is dried tail gas and enters cleaner unit，After removing dust processes, gas enters exhaust treatment system，The solid particle of house outlet mixes with dried raw coal after feeding coal pulverizer grinds sends into boiler combustion.
Claims (4)
1. the power plant's raw coal steam drying system being applicable to variable parameter operation, it is characterized in that, this system mainly includes boiler (1), steam turbine (2), condenser (13), backheat heating unit (3), electromotor (4), control valve (8,9,10), injector (11), blender (12), steam rotary pipe drying machine (15)；Described boiler (1) outlet vapor is connected with steam turbine (2) entrance, steam turbine (2) outlet exhaust steam is connected with condenser (13) entrance, and the steam condensed in condenser (13) is connected with boiler (1) entrance by backheat heating unit (3)；Described steam turbine (2) is also connected with electromotor (4), and steam drives electromotor (4) to generate electricity by acting in steam turbine (2)；The coal-in port of described steam rotary dryer (15) is connected with the outlet of coal breaker, the dry tail gas of steam rotary dryer outlet is connected with cleaner unit (16), the gas of its outlet enters exhaust treatment system, the solid particle of outlet with dried raw coal together, enters boiler combustion after coal pulverizer (17) grinds；The steam-heating pipe bundle of steam tube rotary drier (15) is connected with blender (12) outlet by pipeline, described blender (12) entrance divides two-way, leading up to pipeline and control valve (9) directly draws gas with six grades and is connected, pipeline of separately leading up to is connected with injector (11) outlet, described injector entrance is drawn gas by the Pyatyi of pipeline and control valve (8,10) and steam turbine (2) and seven grades respectively and is connected, and the steam after heat release passes through back water pump (14) and sends back to backheat heating unit (3).
A kind of power plant's raw coal steam drying system being applicable to variable parameter operation the most according to claim 1, it is characterized in that, the steam-heating pipe bundle of described steam tube rotary drier (15) is connected with blender (12) by pipeline, described blender (12) entrance divides two-way, leading up to pipeline and control valve (9) directly draws gas with six grades and is connected, pipeline of separately leading up to is connected with injector (11) outlet, described injector entrance is respectively by pipeline and control valve (8, 10) draw gas with the Pyatyi of steam turbine (2) and seven grades and be connected, steam after heat release sends back to backheat heating unit (3) by back water pump (14).
A kind of power plant's raw coal steam drying system being applicable to variable parameter operation the most according to claim 1, it is characterized in that, when unit declared working condition is run, by opening the control valve (9) of six grades of bleed steam pipeworks, close Pyatyi and the control valve (8,10) of seven grades, use steam turbine six grades to draw gas and make drying source；When shoulder load operating mode is run, close the control valve (9) of six grades of bleed steam pipeworks, open the control valve (8,10) that five, seven two-stages are drawn gas, utilizing Pyatyi higher pressure to draw gas seven grades of relatively low-pressure pumping steams of injection by injector (11), the mixed vapour of generation is as drying source；Unit, when underrun, is only opened the control valve (8) that Pyatyi is drawn gas, is directly drawn gas as drying source using steam turbine Pyatyi.
A kind of power plant's raw coal steam drying system being applicable to variable parameter operation the most according to claim 3, it is characterized in that, described injector (11) is to utilize steam turbine Pyatyi injection steam turbine seven grades of drawing gas to draw gas, and mass ratio of induced-to-inducing air specifically can be chosen according to the unit pressure after parameter and mixing that draws gas.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620070750.0U CN205482289U (en) | 2016-01-26 | 2016-01-26 | Raw coal steam drying system of power plant suitable for operate in a variable working condition |
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| CN201620070750.0U CN205482289U (en) | 2016-01-26 | 2016-01-26 | Raw coal steam drying system of power plant suitable for operate in a variable working condition |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107300297A (en) * | 2017-08-10 | 2017-10-27 | 阜阳华润电力有限公司 | A kind of coal slime drying system |
| CN111734508A (en) * | 2020-06-14 | 2020-10-02 | 清华大学 | Low-pressure cylinder cutting cylinder with built-in injection supercharging tube bundle and full-load heat supply method and system |
-
2016
- 2016-01-26 CN CN201620070750.0U patent/CN205482289U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107300297A (en) * | 2017-08-10 | 2017-10-27 | 阜阳华润电力有限公司 | A kind of coal slime drying system |
| CN111734508A (en) * | 2020-06-14 | 2020-10-02 | 清华大学 | Low-pressure cylinder cutting cylinder with built-in injection supercharging tube bundle and full-load heat supply method and system |
| CN111734508B (en) * | 2020-06-14 | 2024-04-19 | 清华大学 | Low-pressure cylinder cutting and full-load heat supply method and system with built-in injection pressurizing tube bundle |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160817 Termination date: 20170126 |