CN110080959A - A kind of hierarchical solar assistant coal electricity generation system - Google Patents
A kind of hierarchical solar assistant coal electricity generation system Download PDFInfo
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- CN110080959A CN110080959A CN201910225917.4A CN201910225917A CN110080959A CN 110080959 A CN110080959 A CN 110080959A CN 201910225917 A CN201910225917 A CN 201910225917A CN 110080959 A CN110080959 A CN 110080959A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
- F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
- F03G6/065—Devices for producing mechanical power from solar energy with solar energy concentrating means having a Rankine cycle
- F03G6/067—Binary cycle plants where the fluid from the solar collector heats the working fluid via a heat exchanger
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
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- Sustainable Energy (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The present invention proposes a kind of hierarchical solar assistant coal electricity generation system, variety classes solar thermal collector is coupled by the difference sections different from heater respectively of its thermal-arrest grade, plate type evacuated pipe collecting system (ET) is connected in parallel in part and is pressed on heater, groove type solar collecting system (PT) is connected in parallel on partial high pressure heater, water supply is heated using the high-quality steam extracted in solar heat substitution coal fired power plant steam turbine, the steam extraction saved can continue to do work in steam turbine.Solar energy cascade utilization complementary and comprehensive with conventional Coal-fired group is realized, the steam extraction amount of steam turbine high intermediate pressure cylinder is reduced, reduces partial fuel coal consumption, reduce costs, possess preferable economy.
Description
Technical field
The invention belongs to field of solar thermal power generation technical field, in particular to a kind of hierarchical solar assistant coal power generation
System.
Background technique
Current technology related to the present invention mainly includes solar energy assisted coal fired generation technology, groove type solar thermal-arrest skill
Art and flat technology in vacuum tube, the state of development and feature of respective technology are as follows:
1. solar energy assisted coal fired generation technology
The energy resource structure in China's " rich coal, oil-poor, few gas " determines that China is the country for using coal as its main energy source consumption, though
Right China is adjusting the energy resource structure of oneself step by step, reduces the dependence for fossil fuel, but the current electric energy in China is main
Or it is realized by coal unit, China's coal for power generation amount accounts for 50% or more of coal overall consumption, generates in power generation process
Environmental pollution and global warming the problems such as be also cannot be neglected, so improve Thermal generation unit, power industry develop
Clean energy resource, implementation structure optimization, raising energy conversion efficiency are concerned all the time；Solar energy is as clean energy resource
One kind had been to be concerned by more and more people with its inexhaustible advantage, however directly using solar energy send out
Electricity, generating set capacity is smaller, higher cost, and due to the DNI variation under different time sections and Different climate, by weather
Larger with such environmental effects, efficiency is lower.Although can solve the problems, such as that solar energy thermal-power-generating is successional with energy storage device,
But so investment of equipment is excessively high, and cost of electricity-generating will also greatly increase, solar energy and conventional coal unit complemental power-generation
This problem can be well solved.
Simple solar thermal power plants have pollution-free, a low advantage of greenhouse gas emissions, but low efficiency, and generate electricity at
This is higher, if solar energy coupled with coal unit, can efficiently use in low-temperature solar energy resource, can not only play combustion
The advantages that coal set steady is good, and generating efficiency is high, regenerative apparatus needed for eliminating simple solar energy thermal-power-generating, significantly subtracts
Solar energy thermal-power-generating cost is lacked, the energy consumption and pollutant emission problem of coal unit can also be reduced, also compensate for list
The shortcomings that pure solar energy thermal-power-generating stability is poor, low efficiency big by external environment influence.In addition, daytime is peak times of power consumption, together
Sample is also the peak value period of solar radiation, and therefore, solar heat is the optimal external resource of assistant coal power generation.
Solar energy assisted coal fired power generation is a kind of generation mode of low-temperature solar energy resource in effective use.By solar energy coupling
It closes in existing coal-fired power plant, there is the generating efficiency much higher than the hot power plant of independent solar, compared to the simple sun
Can generate electricity the advantage also having in terms of reducing infrastructure cost economically.
Australian Eric Hu seminar proposes solar heat and fossil-fired unit coupling process earliest, and proposition will too
It is positive that auxiliary thermal source substitution extracted steam from turbine hot can be used as to enter conventional power plant heat regenerative system and coal-fired based on Australia Wei Zhou
Thermal power plant carries out theory analysis, the results showed that the auxiliary thermal source substitution extracted steam from turbine collected using sun hot systems enters routine
After power plant's heat regenerative system, thermal power plant generated output about 30% can be theoretically improved.
Using solar power generation benefit it is well known that but build and operation solar heat power generation system higher cost,
These benefits are counteracted to a certain extent.Therefore, efficiency and economy are the passes for influencing solar thermal power plants and further developing
Key factor.According to Engineering Thermodynamics relevant knowledge, in any heat energy system, heat source temperature is higher, and the theoretical efficiency of system is just
It is higher.In other words, the efficiency of simple solar heat power generation system is limited by the maximum temperature that solar heat collector exports, the maximum temperature
Degree is usually less than the maximum temperature of traditional coal-fired power plant.Since the heat-collecting temperature of focus solar collector is higher,
Focus solar collector is uniquely to select in solar energy thermal-power-generating factory.
However, solar heat is used to that the steam turbine of preheating water supply is replaced to take out in solar energy assisted coal fired electricity generation system
Vapour.The maximum temperature of solar energy assisted coal fired generating system apparatus is no longer the output temperature of solar thermal collector, but boiler
Combustion outlet temperature.So, the solar energy thermal-power-generating efficiency of solar energy assisted coal fired electricity generation system is no longer by solar energy collection
The limitation of hot device output temperature.Therefore, solar energy assisted coal fired electricity generation system is low-temperature solar energy during one kind can efficiently use
The system of heat power generation.
Solar energy assisted coal fired generation technology according to different demands by solar heat and coal unit therrmodynamic system into
Row coupling, realizes the synthesis cascade utilization of solar energy, reduces coal-fired consumption.With the raising of technical level, traditional energy conservation changes
It makes and the potentiality of fired power generating unit emission reduction is increasingly reduced, being become using the step comprehensive utilization between the different type energy reduces fire coal
The new measure of unit coal consumption.
2. plate type evacuated Manifold technology
Flat-plate solar heat collector is to receive solar radiation in Solar Energy Heat Utilization System and transmit heat to heat-transfer working medium
The non-concentrating type component of amount, absorber structure are essentially writing board shape.Its working principle is that: whole glass vacuum tube solar energy energy thermal-arrest
Device is to line up array according to certain rule by many branch vacuum solar heat-collecting pipes, together with union pipe, tailstock and reflector etc.
Composition.Its working principle is that: sunlight irradiates on inner pipe through outer glass tube, and the outer wall that inner tube is coated with selective coating absorbs
Sunlight is translated into thermal energy, the working medium being transmitted in inner tube.
Plate type evacuated pipe heat collector belongs to one kind of non-concentrating type solar thermal collector.Non-concentrating type heat collector can be received
Collect whole solar radiations, i.e., directly radiates and scatter radiation.In general, according to the difference in place, direct solar radiation is in total sun
About 70% can be accounted in radiation.It can be made up well in one year by the solar energy that non-concentrating type heat collector collects residue 30%
Solar heat be lost, place especially unsatisfactory in solar energy resources.In addition, with light-focusing type solar heat collector (such as
Groove type heat collector) it compares, the cost in terms of initial outlay and maintenance of non-concentrating type solar heat collector is lower and required
Land area is also smaller.
Suzhou Industrial Park Tian Run solar water heater factory successfully has developed the planar vacuum pipe being embedded on balcony balustrade
Solar thermal collector has simultaneously applied for patent, realizes the combination of solar energy and building.The Yuan Yingli etc. of Shanghai Communications University
A kind of vacuum pipe solar air collector with interpolation pipe structure is had developed, the heat collector entirety collecting efficiency is high, and total
Body heat loss coefficient is small.Ren Yunfeng, Yu Jianlin of Xi'an Communications University et al. are by compound parabolic concentrator (CPC) and heat pipe plate
Formula heat collector combines, and has studied a kind of using planar shaped absorber plate as the CPC type hot pipe type solar heat collector of receiver, the collection
Hot device has the characteristics that heat-collecting temperature is high, collecting efficiency is high and heat loss is low compared to general heat pipe flat type solar heat collector.
Ou Yingcheng has developed a kind of flat type solar heat collector manufactured using new alloy material and special construction, it can be applied
In building tiling and curtain wall, hot water engineering and domestic solar water heater can also be applied to, realize building tiling and casual household
The unification and compatibility of installation.
Plate type evacuated pipe heat collector is a kind of new type solar energy collection developed on the basis of flat plate solar collector
Thermal is a kind of advanced flat solar heat collector, it can not need optically focused with reasonable efficiency and tracking generates medium temperature
Solar heat.This collector structure is simple, easily manufactured, highly reliable；Collecting efficiency is high, good heat insulating, and full glass is true
The core element of blank pipe solar heat collector is glass heat-collecting vacuum tube, it uses vacuum technique, is pumped between interior, cover glass tube true
Sky, general vacuum degree are less than 10-4Millimetres of mercury eliminates the convection current and conduction heat waste of gas, and application selective absorbing applies
Layer, the outer surface that coating for selective absorption is deposited on inner tube constitute absorber, convert solar energy into thermal energy, heat inner glass tube
Interior heat-transfer fluid is preferably minimized the radiation heat loss of evacuated collector tube.
Working medium is separately flowed into after entering and is exchanged heat in each vacuum tube, finally collects outflow heat collector, this paper's is true
Blank pipe heat collector uses concatenated frame mode, and the working medium entered from heat collector header entrance flows through each vacuum tube, they
Runner there was only determining one, be at series connection between all vacuum tubes, therefore, working medium is in each vacuum tube
The interior heat exchange that can be realized between absorber plate, improves the thermal efficiency of system.Though internal drag can increased, work
Matter can sufficiently be exchanged heat in vacuum tube.
3. groove type solar heat collection technology
One kind of parabolic trough collector temperature solar heat collector as in is in optically focused class heat collector uniquely in business
The technology tested on the basis of change.
Slot light collection type heat collector is that one of solar airconditioning and electricity generation system is important as one of line focus type
Device.It is generally by solar position sensor, automatic tracking mechanism, parabola groove reflector, coaxial sunlight receiver and defeated
It is formed with pipeline.Natural light focuses on receiver by reflector, is transmitted to the collection thermal medium in absorber internal flow, becomes
Required available energy.Since the circumsolar position of tellurian any point is at any time in variation, so heat collector must fill
If tracking system, according to the orientation of the sun, the position of reflector is adjusted at any time, to guarantee opening face and the incidence sun of reflector
It radiates always orthogonal.
The reflector of solar radiation thrown object line focuses on absorber, and radiation energy is converted into thermal energy.Receiver is located at anti-
On the focus line of emitter, the heat of absorption is transmitted to the high-temperature medium recycled in pipe, then will by heat exchanger by high-temperature medium
Heat is transmitted to working media (such as: water, conduction oil etc.).The sunlight that reflector can be concentrated on the receiver is normal intensity
30-100 times.Therefore, absorber is the bearer that luminous energy is converted to heat process in heat collector, and the height of transfer efficiency will
Directly affect the collecting efficiency of system.Cavity absorber is to can be used for the another of slot type focusing solar collector in addition to vacuum tube
Kind absorption plant.
Paraboloid trough type collecting system there are mainly two types of mode, indirect heat exchange vapour system and direct steam generate system
System.Trough type solar power generation technology is that current cost is minimum, the technology of least risk, and general there are two types of modes: steam is direct
Generation system and indirect heat exchange system.
(1) indirect heat exchange steam generating system
In indirect heat exchange steam generating system, intermediate medium is heated through groove type heat collector, and is passed heat by heat exchanger
Pass acting working medium.System has two sets of circulation lines, and for major cycle pipeline using oil as cycle fluid, oil passes through paraboloid trough type thermal-arrest
For the absorption tube of device by solar energy heating, secondary circulation line passes through one using water and steam as cycle fluid, with major cycle pipeline
Heat exchanger exchanges heat.
The major advantage of indirect heat exchange steam generating system is that there was only the friendship of heat between circulation line and secondary circulation line
It changes, i.e., is exchanged between solar energy subsystem and conventional power generation circulation without working medium, system run all right is good.The disadvantage is that due to oil temperature
Degree is high, major cycle component heat resistance require it is high, it is oily it is at high cost, be easy aging at high temperature, once leakage will will appear dirt
Dye environment and the problems such as causing fire, the reduction of the raising and cost that lead to system thermal performance is restricted.
(2) direct steam generation system (DSG)
With DSG (the Direct Steam Generation) parabolic trough collector of water (steam) as a heat transfer medium
It is one of the advanced technology of parabolic trough collector, solar energy thermal-power-generating can be substantially reduced when for solar energy thermal-power-generating
Cost.Working medium can be heated to 410 DEG C, 10MPa or so by DSG heat collector highest at present, with indirect heat exchange steam generating system phase
Than in direct steam generation system, cycle fluid is introduced directly into receiver and absorbs solar heat, and it is parabolic that heat exchange efficiency is high
One developing direction of face groove type heat collector.
Summary of the invention
The invention proposes a kind of hierarchical solar assistant coal electricity generation systems, it is characterised in that: coal-burning boiler and vapour
Turbine high pressure cylinder, intermediate pressure cylinder, the first and second low pressure (LP) cylinders and generator are sequentially connected, the first and second low pressure (LP) cylinders exhaust
It is connected each by the first and second condensers with condensate pump, condensed water passes sequentially through No. eight low-pressure heaters, No. seven low pressure
Heater, No. six low-pressure heaters, No. five low-pressure heaters, No. five low-pressure heaters go out saliva a part and add by pressure in No. four
Hot device, another part absorb the medium temperature solar heat of plate type solar heat collection field, two strands after heating by First Heat Exchanger
Saturated vapor is sent into oxygen-eliminating device after converging；The oxygen-eliminating device goes out saliva after feed pump pressurizes, by No. three press heater and
No. two high-pressure heaters, No. two high-pressure heater outlet vapor a part pass through No.1 high-pressure heater, and another part passes through the
Two heat exchangers absorb the high-temperature solar of groove type solar heat collecting field, and two strands of steam after heat absorption are sent into coal-fired pot after converging
Furnace forms circulation loop.
Further, heat regenerative system is hydrophobic by the way of flowing automatically step by step.
Further, the steam turbine high-pressure cylinder, intermediate pressure cylinder, the first and second low pressure (LP) cylinders for expansion work and generate at different levels
Steam extraction is for heating water supply.
Further, first and second condenser be respectively used to condense the exhaust of first and second low pressure (LP) cylinder to
Saturated-water phase, to recycle.
Further, further include small turbine, be water supply boosting for providing steam extraction for the feed pump.
Compared with the prior art, the invention has the following beneficial effects:
(1) a kind of hierarchical solar assistant coal electricity generation system provided by the invention, by different types of solar energy collection
Hot device is coupled with the heater not at the same level of heat regenerative system respectively by the difference of its thermal-arrest grade, using heat exchanger by solar energy
Heat exchanges heat with cycle fluid, and so, the high-temperature solar substitution that groove type heat collector is absorbed is supplied to the first order
The steam extraction that height adds, the middle low-temperature solar energy substitution part that flat type solar heat collector is absorbed are supplied to the low pumping added of the fourth stage
Vapour, the high-quality steam substituted continue expansion work in steam turbine.It is complementary and comprehensive with fossil energy to realize solar energy
Close cascade utilization.
(2) a kind of hierarchical solar assistant coal electricity generation system provided by the invention, being thermally integrated for solar energy increase
The flow of steam turbine cycle working medium increases the power output of system, and boiler exhaust gas loss can further decrease, and realizes solar heat
The raising for turning effect rate, reduces costs, and reduces fossil energy consumption and corresponding CO2Discharge.Traditional solar energy and combustion
Coal power generation system couples (SAPG) usually only level-one solar thermal energy and inputs, i.e. solar parabolic through power generation system and dynamical system
In a certain fixation energy conversion process coupling, waste solar energy amount of scatter radiation, and higher cost.The present invention attempt from
The angle of " classification " is set out, seek different types of solar energy heat collector by its operating temperature it is different respectively with dynamical system
The grade matching and step complementary relationship, sunykatuib analysis of each thermal procession obtain: under equal fuel input, stagewise SAPG
The solar heat input share of system is higher than tradition SAPG system, and the net generating efficiency of solar energy is higher than traditional SAPG system
2.14%；Due to the increase of solar thermal energy input, extraction flow of steam is reduced, so that the net output work of stagewise SAPG system is high
In traditional SAPG system and CCGT system；Due to the increase of net output work, the thermal efficiency of stagewise SAPG system is risen to
48.98%, and it is only 47.84% that the fuel base generating efficiency of tradition SAPG system, which is 48.47%, CCGT system,.Stagewise
Thermal efficiency ratio tradition SAPG system and CCGT the system difference high 0.63% and 1.14% of SAPG system.Based on to conservation of fuel
Consider, stagewise SAPG system coa consumption rate saves 2.67g/kWh than simple slot type SAPG system, saves than traditional CCGT system
5.97g/kWh。
(3) a kind of hierarchical solar assistant coal electricity generation system provided by the invention not only realizes solar heat and turns
The raising of effect rate, reduces costs, and reduces fossil energy consumption and corresponding CO2Discharge, it is energy saving and be effectively reduced
Environmental pollution also achieves solar energy and the complementary of fossil energy and comprehensive cascade utilization.Heating power, economy, the feature of environmental protection are all
It is good, there is wide future in engineering applications.
Detailed description of the invention
Fig. 1 is hierarchical solar assistant coal electricity generation system block diagram of the invention.
Wherein, symbol description is as follows in figure:
1- coal-burning boiler；2- steam turbine high-pressure cylinder；3- Steam Turbine Through IP Admission；The first low pressure (LP) cylinder of 4- steam turbine；5- steam turbine
Second low pressure (LP) cylinder；The first condenser of 6-；7- condensate pump；No. eight low-pressure heaters of 8-；No. seven low-pressure heaters of 9-；10- six
Low-pressure heater；No. five low-pressure heaters of 11-；Heater is pressed in 12- tetra-；13- oxygen-eliminating device；14- small turbine；15- tri-
High-pressure heater；No. bis- high-pressure heaters of 16-；17- No.1 high-pressure heater；18- feed pump；21- First Heat Exchanger；22-
Two heat exchangers；23- flat type solar heat collector；24- trough type solar heat-collector；The second condenser of 25-；26- generator.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.
This hierarchical solar assistant coal electricity generation system provided by the invention is by variety classes solar thermal collector
It is coupled by the different different sections respectively at heater of its thermal-arrest grade, plate type evacuated pipe collecting system (ET) is connected in parallel on
It is pressed on heater in part, groove type solar collecting system (PT) is connected in parallel on partial high pressure heater, solar heat is utilized
The high-quality steam that extracts heats water supply in substitution coal fired power plant steam turbine, the steam extraction saved can in steam turbine after
Continuous acting.
Referring to Fig. 1, this hierarchical solar assistant coal electricity generation system provided by the invention includes:
Coal-burning boiler (1) generates steaming after reaching certain parameter for absorbing the water supply in coal-fired heat heating vapour-water system
Vapour (S2).It is sent into steam turbine high-pressure cylinder (2) and carries out expansion work.
Steam turbine high-pressure cylinder (2), intermediate pressure cylinder (3), the first low pressure (LP) cylinder (4), the second low pressure (LP) cylinder (5) for expansion work and produce
Raw steam extractions (S5, S6, S7, S8, S9, S10, S11, S12, S13, S14) at different levels are for heating water supply；
First condenser (6) and the second condenser (25) be used for by the exhausts of the first and second low pressure (LP) cylinders (4,5) (S12,
S14) condensation is to saturated water (S15) state, to recycle；
Condensate pump (7) adds for receiving the condensed water (S15) for carrying out condenser, and by condensed water No. eight low pressure of feeding
Hot device (8)；
No. eight low-pressure heaters (8), No. seven low-pressure heaters (9), No. six low-pressure heaters (10), No. five low-pressure heaters
(11), heater (12) are pressed in No. four, for successively heating water supply (S16).
Plate type solar heat collection field (23), for collect medium temperature solar thermal energy and by heat exchanger (21) heat No. five it is low
It presses heater outlet water (S17) to saturated vapor (S18)；
Oxygen-eliminating device (13) water supply (S8, S18) deoxygenation；
Small turbine (14), for providing the boosting of steam extraction water supply for feed pump (18)；
Feed pump (18) for receiving the water supply after deoxygenation, and is sent into No. three and presses heater (15)；
In No. three press heater (15), No. two high-pressure heaters (16), No.1 high-pressure heater (17), for water supply into
The heating of row higher temperature.
Groove type solar heat collecting field (24), for assembling high temperature solar thermal energy and by heat exchanger (22) heating working medium
The steam (S20) of (S19) to higher temperature is sent into coal-burning boiler (1).
Generator (26), the mechanical work for generating turbine are converted into power output.
High temperature and high pressure steam a part of boiler (1) is provided by high-pressure heater (17) outlet vapor (S1), import and one
Number high-pressure heater (17) is connected.Steam turbine high-pressure cylinder (2) is connected with coal-burning boiler (1), for receiving high pressure superheated steam
(S2) it does work, and sends steam discharge (S21) back to coal-burning boiler reheating.Second low pressure (LP) cylinder (5) outlet is connected with the second condenser (25).
First Heat Exchanger (21) presses heater (12) in parallel with No. four, and it is logical that No. five low-temperature heaters (11) go out saliva (S17) a part
Pressure heater (12) in No. four is crossed, another part is connected by control valve (19) with the water inlet of First Heat Exchanger (21), and first
The outlet of heat exchanger (21) is connected with oxygen-eliminating device (13) entrance.Second heat exchanger (22) is in parallel with No.1 high-pressure heater (17),
For No. two high-pressure heater (16) outlet vapor (S19) a part by No.1 high-pressure heater (17), another part passes through control
Valve (20) is connected with the water inlet of the second heat exchanger (22), and the outlet of the second heat exchanger (22) is connected with coal-burning boiler (1).Steamer
The steam extraction (S5) of machine high pressure cylinder (2) introduces No.1 high-pressure heater (17) and exports working medium for heating No. two high-pressure heaters
(S19), the steam discharge (S9) of Steam Turbine Through IP Admission (3), which is introduced into No. four, presses heater (12) to go out for heating No. five low-pressure heaters
Mouth working medium (S17).Intermediate pressure cylinder (3) steam extraction (S8) a part is for oxygen-eliminating device (13) to feedwater deaeration, and another part is for passing through
Steam turbine (14) is that feed pump (18) provide the boosting of power water supply.
Workflow specifically: pump (7) by condensed water (S15) extract out successively by low-pressure heaters at different levels (8,9,10,
11) it is heated, then for a part by pressing heater (12) in No. four, another part passes through First Heat Exchanger (21) and plate
The middle low-temperature solar that formula heat collector (23) is collected carries out heat exchange, generates saturated water (S18) and is sent into oxygen-eliminating device (13) progress
Deoxygenation, pump (18) successively send after the water supply boosting after deoxygenation into the second heat exchange after high-pressure heater (15,16) heating
The high-temperature solar that device (22) and groove type heat collector (24) are collected into carries out heat exchange, generates qualified high temperature and pressure and steams
Vapour (S1) is sent into coal-burning boiler (1)；Coal-fired boiler combustion generate high temperature and high pressure steam (S2) enter steam turbine high-pressure cylinder (2) into
Row expansion work, high pressure cylinder outlet vapor (S21) are sent into intermediate pressure cylinder (3) after being sent into coal-burning boiler (1) reheating, then in turn through
Intermediate pressure cylinder (4), low pressure (LP) cylinder (5) carry out expansion work, and steam turbine senior middle school low pressure (LP) cylinder (2,3,4,5) sends out the pumping of different temperatures respectively
Vapour is sent in senior middle school's low-pressure heater (8-17) for heating to water supply.Second condenser (25) is cold by low pressure (LP) cylinder steam discharge (S14)
It coagulates to saturated water (S15) state；Generator (26) is connect with steam turbine, and it is defeated to convert electric energy for the mechanical work that turbine generates
Out.
It is illustrated below with a specific embodiment.System is simulated with Ebsilon software, object model base
In the conservation of energy, the conservation of mass and species conservation.For the coal low heat valve that coal fired power plant uses for 29270kJ/kg, steam is dynamic
Power unit selects the steam turbine and waste heat boiler of three-pressure reheat formula, and reheat vapor cycle is to improve average acting temperature and reduce wet
Degree.In order to simplify simulation, it is assumed that unit whole year runs in declared working condition.Solar energy subsystem is respectively heat transfer according to conduction oil
The groove type solar heat collecting field of working medium and the design of flat vacuum tube collector.Sunshine parameter uses Australia south A Delai
Moral area data, 35 ° of geographical location S, 138 ° of E, environment temperature perseverance are 20 DEG C, and design point cut-off penetrates irradiation intensity 2132kWh/
m2, scattering radiation intensity is 574kWh/m2。
Coal fired power plant main design parameters are shown in Table 1.Main related condition are as follows: generated energy 1000MW, main steam temperature are
600 DEG C, 26.25 MPa of pressure；600 DEG C of reheat steam temperature；Feedwater flow 755.491kg/s；290 DEG C of feed temperature；Coal consumption
Rate 257.09g/kWh.
1 coal fired power plant main design parameters of table
LS-2 heat collector, plate type evacuated pipe heat collector parameter such as table 2,3.Table 4 is solar heat-collection system major parameter.
2 slot type LS-2 heat collector major parameter of table
3 flat-plate collector major parameter of table
4 solar heat-collection system major parameter of table
The performance calculation result of specific embodiment design conditions such as table 5, under identical assumed condition, while to biography
System coal unit, simple slot type SAPG system and stagewise SAPG system unit of the present invention simulation comparison.
5 calculated result of table
System thermodynamic systems index is as follows:
System thermal efficiency is defined as:
The solar energy thermal-power-generating efficiency of solar energy assisted coal fired electricity generation system:
The specific steam consumption calculation method of coal unit are as follows:
D=D/W=3600wnet
The heat rate calculation method of coal unit are as follows:
q0=Q/W=dq1
The coa consumption rate calculation method of coal fired power plant are as follows:
b0=Mcoal/ W=123/ ηt
As it can be seen that the solar heat input share of stagewise SAPG system is higher than tradition SAPG system under equal fuel input
System, the net generating efficiency of solar energy are higher by 2.14% than traditional SAPG system；Due to the increase of solar thermal energy input, extracted steam from turbine
Amount is reduced, so that the net output work of stagewise SAPG system is higher than tradition SAPG system and CCGT system；Due to net output work
Increase, the thermal efficiency of stagewise SAPG system rises to 48.98%, and the fuel base generating efficiency of tradition SAPG system is
48.47%, CCGT system are only 47.84%.Based on the considerations of to conservation of fuel, stagewise SAPG system coa consumption rate is than simple slot
Formula SAPG system saves 2.67g/kWh, 5.97g/kWh higher than traditional CCGT system.
It can be seen that hierarchical solar assistant coal electricity generation system from thermal performance comparative analysis, by the slot type sun
The heat that energy heat collector absorbs replaces high-pressure heater steam extraction, meanwhile, flat-plate collector is replaced into part mesolow heater
Water supply is heated in steam extraction, is further increased solar energy input, is substantially increased solar energy utilization ratio.Also, the heat collection of solar energy
It is matched at the steam extraction for improving steam turbine, has more steam extractions that can continue expansion work in cylinder, increase system
Function out improves energy utilization rate.
This hierarchical solar assistant coal electricity generation system proposed by the present invention not only increases solar thermal energy input,
The cleared-out function for improving system has also selected the plate type evacuated pipe of low cost, has reduced cost of electricity-generating, is the efficient of solar energy
Using providing the selection of new low cost.System of the invention also solves simple solar heat power generation system energy simultaneously and turns
Low efficiency, problem at high cost are changed, solar energy and the complementary of fossil energy and comprehensive cascade utilization is realized, improves solar energy
Utilization rate, and realize energy-saving and emission-reduction.Heating power, economy, the feature of environmental protection are all good, have wide future in engineering applications.
Claims (5)
1. a kind of hierarchical solar assistant coal electricity generation system, it is characterised in that: coal-burning boiler and steam turbine high-pressure cylinder, middle pressure
Cylinder, the first and second low pressure (LP) cylinders and generator are sequentially connected, and the first and second low pressure (LP) cylinders exhaust is each by the first He
Second condenser is connected with condensate pump, and condensed water passes sequentially through No. eight low-pressure heaters, No. seven low-pressure heaters, No. six low pressure
Heater, No. five low-pressure heaters, No. five low-pressure heaters go out saliva a part by pressing heater in No. four, and another part is logical
The medium temperature solar heat that First Heat Exchanger absorbs plate type solar heat collection field is crossed, two strands of saturated vapors after heating are sent after converging
Enter oxygen-eliminating device；The oxygen-eliminating device goes out saliva after feed pump pressurizes, by pressing heater and No. two high-pressure heaters in No. three, two
Number high-pressure heater outlet vapor a part passes through No.1 high-pressure heater, and another part absorbs slot type too by the second heat exchanger
The high-temperature solar of positive energy heat collecting field, two strands of steam after heat absorption are sent into coal-burning boiler, form circulation loop after converging.
2. a kind of hierarchical solar assistant coal electricity generation system according to claim 1, it is characterised in that: heat regenerative system
It is hydrophobic by the way of flowing automatically step by step.
3. a kind of hierarchical solar assistant coal electricity generation system according to claim 1, it is characterised in that: the steamer
Machine high pressure cylinder, intermediate pressure cylinder, the first and second low pressure (LP) cylinders for expansion work and generate steam extractions at different levels for heating water supply.
4. a kind of hierarchical solar assistant coal electricity generation system according to claim 1, it is characterised in that: described first
It is respectively used to condense the exhaust of first and second low pressure (LP) cylinder to saturated-water phase with the second condenser, to recycle benefit
With.
5. a kind of hierarchical solar assistant coal electricity generation system according to claim 1, it is characterised in that: further include small
Steam turbine is water supply boosting for providing steam extraction for the feed pump.
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