CN105331379A - Power generation system and power generation method - Google Patents
Power generation system and power generation method Download PDFInfo
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- CN105331379A CN105331379A CN201510780139.7A CN201510780139A CN105331379A CN 105331379 A CN105331379 A CN 105331379A CN 201510780139 A CN201510780139 A CN 201510780139A CN 105331379 A CN105331379 A CN 105331379A
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- gas
- coke
- power generation
- flue gas
- cooling
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
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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
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
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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
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
The invention discloses a power generation system and a power generation method. The power generation system comprises a coke oven, a combustion chamber, a waste heat boiler and a power generator, wherein the coke oven is used for destructive distillation of coal to obtain raw coke oven gas and coke; the combustion chamber is connected with the coke oven and used for combusting the raw coke oven gas to obtain smoke; the waste heat boiler is connected with the combustion chamber, and first heat exchange is carried out by means of the smoke and water in the waste heat boiler to obtain steam and cooled smoke; the power generator is connected with the waste heat boiler and used for generating power through the steam. The power generation system has the advantages of being simple in structure, high in heat efficiency and low in energy consumption.
Description
Technical field
The present invention relates to power generation system and electricity-generating method.
Background technology
The coking process of existing coke oven is: load in coking chamber of coke oven by the mixed coal sent here between standby coal car, carry out isolated air heating in required time, to 950 ~ 1050 DEG C, the stages such as drying, preheating, pyrolysis, melting, bonding, solidification, contraction that have passed through finally refine coke, are pushed out outside stove after coke maturation.
First the raw gas that coal produces in coking chamber retort process is pooled to coking chamber headspace, then enters effuser through upcast, bridge tube.In bridge tube, the raw gas of about 700 DEG C is sprayed by ammoniacal liquor and is cooled to about 80 DEG C, separates out the tar in raw gas simultaneously.The tar that coal gas and condensation are got off is equal to together with ammoniacal liquor sends into gas purification workshop through inhaling gas pipe.
A large amount of high temperature raw gas temperatures that coking chamber destructive distillation produces are at 700 ~ 800 DEG C, and raw gas waste heat accounts for more than 30% of waste heat of coke oven resource.At present, the high temperature raw gas that coking chamber destructive distillation produces is imported effuser by upcast, bridge tube by domestic and international coke oven, and ammoniacal liquor is sprayed before raw gas enters effuser, raw gas temperature is down to less than 80 DEG C, rotary system is produced again by pipeline feedingization, the ammoniacal liquor that temperature raises is lowered the temperature by naturally cooling and heat exchange, cleans in a large number and efficient heat energy is utilized, causes the huge wasting of resources.
Thus, a large amount of high temperature raw gas that coking chamber destructive distillation produces need to be utilized further.
Summary of the invention
The present invention is intended at least to solve one of technical problem existed in prior art.For this reason, one object of the present invention is to propose a kind of power generation system, and this power generation system has that technique is simple, thermo-efficiency is high, low power consumption and other advantages.
Thus, according to an aspect of the present invention, the invention provides a kind of power generation system.According to embodiments of the invention, this system comprises: coke oven, and described coke oven is used for carrying out destructive distillation process to coal, to obtain raw gas and coke, wherein, described raw gas comprises dry distillation gas and tar; Combustion chamber, described combustion chamber is connected with described coke oven, for carrying out burn processing to described raw gas, to obtain high-temperature flue gas; Waste heat boiler, described waste heat boiler is connected with described combustion chamber, utilizes the water in described high-temperature flue gas and described waste heat boiler to carry out the first heat exchange process, to obtain the flue gas after the first water vapor and cooling; And power generation assembly, described power generation assembly is connected with described waste heat boiler, utilizes described first water vapor to generate electricity.
Described coke oven has coal entrance, gas entry, coke export, raw gas outlet.
Described combustion chamber has raw gas entrance, combustion air inlet and the first exhanst gas outlet.Described raw gas entrance exports with the described raw gas of described coke oven and is connected.
Described waste heat boiler has smoke inlet, the second exhanst gas outlet, feedwater entrance and superheated vapour outlet.Described smoke inlet is connected with described first exhanst gas outlet of described combustion chamber.
Described power generation assembly has steam-in, vapour outlet and electric quantity output end.Described steam-in exports with the superheated vapour of described waste heat boiler and is connected.
According to the power generation system of the embodiment of the present invention, the high temperature raw gas that coke oven produces directly enters combustion chambers burn, fully can reclaim sensible heat and the latent heat of high temperature raw gas, the conversion efficiency of thermoelectric of system is high, and a large amount of reluctant waste water can not be produced, do not need gas purification and downstream equipment.The high-temperature flue gas that raw gas burning simultaneously produces enters waste heat boiler and produces a large amount of water vapors, and water vapor enters power generation assembly generating, and product is clean electric energy, and non-secondary pollution, Social benefit and economic benefit is high.Thus, the power generation system of the embodiment of the present invention has the advantage that structure is simple, thermo-efficiency is high, energy consumption is low.
In addition, power generation system according to the above embodiment of the present invention can also have following additional technical characteristic:
According to embodiments of the invention, this system comprises further: pulverizer, and described pulverizer is connected with described coke oven, for carrying out pulverization process to described coal, to obtain coal dust, wherein, the massfraction that in described coal dust, particle diameter is not more than the described coal dust of 3mm is not less than 85%.
According to embodiments of the invention, this system comprises further: dryly put out stove, the described dry stove that puts out is connected with described coke oven, for described coke and the described dry recycle gas put out in stove are carried out the second heat exchange process, to obtain the coke of cooling and the recycle gas after heating; Fly-ash separator, described fly-ash separator is connected with the described dry stove that puts out, for carrying out purifying treatment to the recycle gas after described heating, so that the recycle gas after being purified; And coke dry quenching boiler, described coke dry quenching boiler is connected with described power generation assembly with described fly-ash separator, the water in the recycle gas after described purification and described coke dry quenching boiler is utilized to carry out the 3rd heat exchange process, to obtain recycle gas and second water vapor of cooling, wherein, described second water vapor is delivered to described power generation assembly and generates electricity.
According to embodiments of the invention, this system comprises further: rotary air preheater, described rotary air preheater is connected with described waste heat boiler with described combustion chamber, for utilizing the combustion-supporting gas of the flue gas after described cooling to described combustion chamber to carry out thermal pretreatment, to obtain the flue gas of the combustion-supporting gas after preheating and cooling.
According to a further aspect in the invention, the invention provides a kind of electricity-generating method.According to embodiments of the invention, the method comprises: coal is carried out destructive distillation process, to obtain raw gas and coke, wherein, described raw gas comprises dry distillation gas and tar; Described raw gas is carried out burn processing, to obtain high-temperature flue gas; Described high-temperature flue gas and water is utilized to carry out the first heat exchange process, to obtain the flue gas after the first water vapor and cooling; And utilize described second water vapour to generate electricity.
According to the electricity-generating method of the embodiment of the present invention, the high temperature raw gas that destructive distillation process produces directly carries out burn processing, fully can reclaim sensible heat and the latent heat of high temperature raw gas, the conversion efficiency of thermoelectric of the method is high, and a large amount of reluctant waste water can not be produced, do not need gas purification and downstream equipment.The high-temperature flue gas that raw gas burning simultaneously produces and water carry out heat exchange process and produce a large amount of water vapors, and water vapour enters power generation assembly generating, and product is clean electric energy, and non-secondary pollution, Social benefit and economic benefit is high.Thus, the electricity-generating method of the embodiment of the present invention has simple to operate, that thermo-efficiency is high, energy consumption is low advantage.
According to embodiments of the invention, the method comprises further: described coal is carried out pulverization process, to obtain coal dust, wherein, the massfraction that in described coal dust, particle diameter is not more than the described coal dust of 3mm is not less than 85%.
According to embodiments of the invention, the method comprises further: described coke and recycle gas are carried out the second heat exchange process, to obtain the coke of cooling and the recycle gas after heating; Recycle gas after described heating is carried out purifying treatment, so that the recycle gas after being purified; And utilize the recycle gas after described purification and water to carry out the 3rd heat exchange process, to obtain recycle gas and second water vapor of cooling, wherein, described second water vapor is used for generating.
According to embodiments of the invention, the method comprises further: utilize the combustion-supporting gas of the flue gas after described cooling to described combustion chamber to carry out thermal pretreatment, to obtain the flue gas of the combustion-supporting gas after preheating and cooling.
According to embodiments of the invention, the temperature of described destructive distillation process is 950-1050 degree Celsius, and the time is 15-25 hour.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 shows the structural representation of power generation system according to an embodiment of the invention;
Fig. 2 shows the structural representation of power generation system according to an embodiment of the invention;
Fig. 3 shows the structural representation of power generation system according to an embodiment of the invention;
Fig. 4 shows the structural representation of power generation system according to an embodiment of the invention;
Fig. 5 shows the schematic flow sheet of electricity-generating method according to an embodiment of the invention;
Fig. 6 shows the schematic flow sheet of electricity-generating method according to an embodiment of the invention;
Fig. 7 shows the schematic flow sheet of electricity-generating method according to an embodiment of the invention;
Fig. 8 shows the schematic flow sheet of electricity-generating method according to an embodiment of the invention;
Fig. 9 shows the schematic flow sheet of electricity-generating method according to an embodiment of the invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
In describing the invention, term " longitudinal direction ", " transverse direction ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", the orientation of the instruction such as " end " or position relationship be based on orientation shown in the drawings or position relationship, be only the present invention for convenience of description instead of require that the present invention with specific azimuth configuration and operation, therefore must can not be interpreted as limitation of the present invention.
It should be noted that, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise one or more these features.Further, in describing the invention, except as otherwise noted, the implication of " multiple " is two or more.
According to an aspect of the present invention, the invention provides a kind of power generation system.With reference to figure 1, according to embodiments of the invention, explain this system, this system comprises: coke oven 100, combustion chamber 200, waste heat boiler 300 and power generation assembly 400.According to embodiments of the invention, coke oven 100, for carrying out destructive distillation process to coal, obtains raw gas and coke, and wherein, raw gas comprises dry distillation gas and tar; Combustion chamber 200 is connected with coke oven 100, for carrying out burn processing to raw gas, obtains high-temperature flue gas; Waste heat boiler 300 is connected with combustion chamber 200, utilizes the water in high-temperature flue gas and waste heat boiler 300 to carry out the first heat exchange process, obtains the flue gas after the first water vapor and cooling; Power generation assembly 400 is connected with waste heat boiler 300, utilizes the first water vapor to generate electricity.
According to the power generation system of the embodiment of the present invention, the high temperature raw gas that coke oven produces directly enters combustion chambers burn, not only avoid the tar condensing bonding tube wall in raw gas and the problems such as the line clogging that causes, and fully can reclaim sensible heat and the latent heat of high temperature carbonization gas, the conversion efficiency of thermoelectric of system significantly improves, and a large amount of reluctant waste water can not be produced, do not need gas purification and downstream equipment.Meanwhile, the high-temperature flue gas that raw gas burning produces enters waste heat boiler and produces a large amount of water vapors, and water vapour enters power generation assembly generating, and product is clean electric energy, and non-secondary pollution, Social benefit and economic benefit is high.Thus, the power generation system of the embodiment of the present invention has the advantage that structure is simple, thermo-efficiency is high, energy consumption is low.
With reference to figure 3, according to embodiments of the invention, this system comprises further: pulverizer 800, pulverizer 800 is connected with coke oven 100, for carrying out pulverization process to coal, obtains coal dust, wherein, the massfraction that in coal dust, particle diameter is not more than the coal dust of 3mm is not less than 85%.Thus, the coal after pulverization process is convenient to carry out destructive distillation process, and destructive distillation treatment temp is low, and the time is short, and the productive rate of raw gas and coke is high.According to embodiments of the invention, the kind of coal is not particularly limited, as long as be applicable to coke oven to carry out destructive distillation process.
According to a particular embodiment of the invention, coke oven 100 has combustion zone, coking chamber, regenerator, hole of coalingging, raw gas outlet and gas entry, and the raw gas outlet of this coke oven 100 is arranged on the top of coking chamber, and is connected with the combustion chamber 200 of power generation system; Coking chamber, between combustion zone, both sides, is built by laying bricks or stones by siliceous refractory [material and is formed, and in coking chamber, coal is heated and becomes coke under isolated air conditions; Combustion zone is the region of gas-fired heat supply, and its inside cross wall is separated into several flues, has a brick gas passage outlet and two chute outlet bottom often pair of flue, respectively ventilating coal gas pipe brick, gas regenerator and air regenerator; Regenerator is positioned at the bottom of coking chamber, its top is connected with combustion chamber through chute, bottom through exhaust gas disc respectively with low-grade gas pipeline, ambient atmosphere with and a point flue communicate, the heat of high-temperature flue gas of accumulation is utilized to come low-grade gas needed for the burning of preheated burning room and air, improve the efficiency of combustion of coke oven, reduce the energy consumption of coke oven.
According to some embodiments of the present invention, the temperature of destructive distillation process is 950 DEG C ~ 1050 DEG C.Thus, dry distillation efficiency is high, and the productive rate of raw gas and coke is high.
According to a particular embodiment of the invention, combustion chamber 200 adopts burner to carry out burn processing.Thus, efficiency of combustion is high, raw gas can in combustion chamber Thorough combustion, produce high-temperature flue gas, according to a particular embodiment of the invention, the temperature of high-temperature flue gas reaches 900-1200 DEG C.In combustion, the water vapor in raw gas absorbs heat further and is warming up to 900-1200 DEG C, obtains high-temperature vapor.Then, the gas mixture of high-temperature flue gas and high-temperature vapor enters waste heat boiler, produces first water vapor of 300-500 DEG C with feedwater heat exchange, and the rotor that the first water vapor enters turbine drive steam turbine rotates, and then drive electrical generators 400 generates electricity.
With reference to figure 2, according to embodiments of the invention, this system comprises further: dryly put out stove 500, fly-ash separator 600 and coke dry quenching boiler 700.According to embodiments of the invention, the dry stove 500 that puts out is connected with coke oven 100, for coke and the dry recycle gas put out in stove 500 are carried out heat exchange process, obtains the coke of cooling and the recycle gas after heating; Fly-ash separator 600 is connected with the dry stove 500 that puts out, for carrying out purifying treatment, the recycle gas after being purified to the recycle gas after heating; Coke dry quenching boiler 700 is connected with power generation assembly 400 with fly-ash separator 600, the recycle gas after purification and the water in coke dry quenching boiler is utilized to carry out the second heat exchange process, to obtain recycle gas and second water vapor of cooling, wherein, the second water vapor is delivered to power generation assembly and generates electricity.Thus, utilize the heat heating cycle gas of coke, recycling recycle gas heating boiler water obtains the second water vapor and generates electricity, thus the heat of STRENGTH ON COKE utilizes fully, thermoelectric conversion rate is high, and meanwhile, the coke after cooling is convenient to carry out follow-up processing treatment.
According to a particular embodiment of the invention, this recycle gas is rare gas element.Thus, the character temperature of recycle gas, nonflammable, security is good.
With reference to figure 4, according to embodiments of the invention, this system comprises further: rotary air preheater 900, this rotary air preheater 900 is connected with waste heat boiler 400 with combustion chamber 200, utilize the combustion-supporting gas of flue gas to combustion chamber 200 after cooling to carry out thermal pretreatment, obtain the flue gas of the combustion-supporting gas after preheating and cooling.According to embodiments of the invention, described rotary air preheater 900 has the second smoke inlet and the 3rd exhanst gas outlet, helps gas outlet, condensation water collection mouth after combustion air inlet and preheating.The smoke inlet of described rotary air preheater is connected with waste heat boiler; The exhanst gas outlet of described rotary air preheater is connected with flue gas purifying equipment; The combustion air air inlet of described rotary air preheater 900 adopts gas blower; The gas outlet that helps after the preheating of described rotary air preheater is connected with combustion chamber; The water of condensation of described rotary air preheater is pooled to water collect tank by reclaiming pipe network.Thus, the waste heat of flue gas is utilized to carry out preheating to combustion-supporting gas, not only be conducive to the burning of combustion-supporting gas, and after thermal pretreatment, the temperature of flue gas reduces further, become liquid water after making a large amount of water vapors in flue gas discharge the latent heat of vaporization in rotary air preheater to recycle, and environmental emission standard can be reached through dust removal process after flue gas cool-down.According to a particular embodiment of the invention, rotate air preheater 900 and adopt ceramic honeycomb body material, there is the features such as corrosion resistance nature is strong, wear-resistant, thermal capacity is large, flue-gas temperature can be down to less than 100 DEG C, in the sensible heat and flue gas of abundant recovered flue gas steam the latent heat of vaporization while, water of condensation that can be a large amount of in recovered flue gas, water of condensation is pooled in water collect tank by reclaiming pipe network.The main component producing flue gas in combustion chamber combustion due to the high-temperature oil gas of complicated component is CO
2and water vapor, after waste heat boiler and the heat exchange of rotary air preheater can after can direct qualified discharge, non-secondary pollution, avoids the defection of traditional oils moisture and produces a large amount of reluctant wastewater problem, have good economic benefit and effects of energy saving and emission reduction.
According to a further aspect in the invention, the invention provides a kind of electricity-generating method.With reference to figure 5, according to embodiments of the invention, the method comprises:
S100 destructive distillation process
According to embodiments of the invention, coal is carried out destructive distillation process, obtain raw gas and coke, wherein, raw gas comprises dry distillation gas and tar.Thus, by destructive distillation process, coal is converted into available, that economic worth is higher raw gas and coke.
According to some embodiments of the present invention, the temperature of destructive distillation process is 950-1050 degree Celsius, and the time is 15-25 hour.Thus, destructive distillation is effective, and the productive rate of raw gas and coke is high.
According to embodiments of the invention, the kind of coal is not particularly limited, as long as be applicable to coke oven to carry out destructive distillation process.
S200 burn processing
According to embodiments of the invention, raw gas is carried out burn processing, to obtain high-temperature flue gas.Thus, pass through burn processing, not only avoid the problem such as line clogging of tar condensing bonding tube wall in raw gas and factor, and coal gas, the tar combustion heat release in raw gas, fully can reclaim sensible heat and the latent heat of high temperature raw gas, conversion efficiency of thermoelectric significantly improves, and can not produce a large amount of reluctant waste water, does not need gas purification and downstream equipment.Simultaneously the burn high-temperature flue gas that produces and water carries out heat exchange process and produces a large amount of water vapors, generates electricity.
S300 first heat exchange process
According to embodiments of the invention, utilize high-temperature flue gas and water to carry out the first heat exchange process, obtain the flue gas after the first water vapor and cooling.Utilize the high-temperature flue gas of high temperature and water to carry out heat exchange process and produce a large amount of the first water vapor for generating electricity.Thus, utilizing the heat that the dry distillation of coal and burning produce, by heat exchange process, without the need to external heat source, a large amount of the first water vapor for generating electricity can being obtained.
According to some embodiments of the present invention, the temperature of the first water vapor is 300-500 degree Celsius.Thus, the water vapour under this temperature condition is easy to driving steam turbine and rotates, thus drives power generation assembly to generate electricity by steam turbine.
S400 generates electricity
According to embodiments of the invention, the first water vapour is utilized to generate electricity.Thus, be the mechanical energy that turbine rotor rotates by the thermal power transfer of water vapour, drive synchronous electric power generating apparatus to rotate generation electric energy and generate electricity, product is clean electric energy, and non-secondary pollution, Social benefit and economic benefit is high.
According to a particular embodiment of the invention, the first water vapor enters steam turbine, and partial heat energy is converted to the mechanical energy that turbine rotor rotates, and drives synchronous generator to rotate and produces electric energy, and the electric energy part of generation is personal to be connected to the grid outward.Qualified discharge after the fume treatment of less than 200 DEG C after residual heat boiler for exchanging heat.
According to the electricity-generating method of the embodiment of the present invention, the high temperature raw gas that destructive distillation process produces directly carries out burn processing, and fully can reclaim sensible heat and the latent heat of high temperature raw gas, conversion efficiency of thermoelectric is high, and a large amount of reluctant waste water can not be produced, do not need gas purification and downstream equipment.The high-temperature flue gas that raw gas burning simultaneously produces and water carry out heat exchange process and produce a large amount of water vapors, and water vapour enters power generation assembly generating, and product is clean electric energy, and non-secondary pollution, Social benefit and economic benefit is high.Thus, the electricity-generating method of the embodiment of the present invention has simple to operate, that thermo-efficiency is high, energy consumption is low advantage.
With reference to figure 6, electricity-generating method comprises further according to an embodiment of the invention:
S500 second heat exchange process
According to embodiments of the invention, coke and recycle gas are carried out the second heat exchange process, obtain the coke of cooling and the recycle gas after heating.Thus, recycle gas is utilized to reclaim the heat of coke.According to a particular embodiment of the invention, this recycle gas is rare gas element.Thus, the character temperature of recycle gas, nonflammable, security is good.
S600 purifying treatment
According to embodiments of the invention, the recycle gas after heating is carried out purifying treatment, so that the recycle gas after being purified.Thus, remove the dust in recycle gas, avoid dust to block reaction unit.
S700 the 3rd heat exchange process
According to embodiments of the invention, utilize the recycle gas after purification and water to carry out the 3rd heat exchange process, obtain recycle gas and second water vapor of cooling, wherein, the second water vapor is used for generating.Thus, utilize heat and the water heat exchange of recycle gas, produce the second a large amount of water vapors, utilize the second water vapor to generate electricity, thermoelectric conversion efficiency is high.
With reference to figure 7, electricity-generating method comprises further according to an embodiment of the invention:
S800 pulverization process
According to embodiments of the invention, coal is carried out pulverization process, to obtain coal dust, wherein, the massfraction that in coal dust, particle diameter is not more than the coal dust of 3mm is not less than 85%.Thus, the coal after pulverization process is convenient to carry out destructive distillation process, and destructive distillation treatment temp is low, and the time is short, and the productive rate of raw gas and coke is high.
With reference to figure 8, electricity-generating method comprises further according to an embodiment of the invention:
S900 thermal pretreatment
According to embodiments of the invention, utilize the combustion-supporting gas of flue gas to combustion chamber after cooling to carry out thermal pretreatment, obtain the flue gas of the combustion-supporting gas after preheating and cooling.Thus, the waste heat of flue gas is utilized to carry out preheating to combustion-supporting gas, not only be conducive to the burning of combustion-supporting gas, and after thermal pretreatment, the temperature of flue gas reduces further, become liquid water after making a large amount of water vapour in flue gas discharge the latent heat of vaporization in rotary air preheater to recycle, and environmental emission standard can be reached through dust removal process after flue gas cool-down.
According to a particular embodiment of the invention, water vapor enters steam turbine, and partial heat energy is converted to the mechanical energy that turbine rotor rotates, and drives synchronous generator to rotate and produces electric energy, and the electric energy part of generation is personal to be connected to the grid outward.Qualified discharge after the fume treatment of less than 200 DEG C after residual heat boiler for exchanging heat.
Below with reference to specific embodiment, the present invention will be described, it should be noted that, these embodiments are only illustrative, and can not be interpreted as limitation of the present invention.
Embodiment 1
In the present embodiment, adopt following mixed coal to be that raw material generates electricity, wherein, the water ratio of mixed coal is 10%, and as shown in Tables 1 and 2, with reference to figure 9, concrete treatment step is as follows for Coal Blending Schemes and technical analysis and ultimate analysis:
The Coal Blending Schemes of table 1 as-fired coal
The technical analysis of table 2 as-fired coal and ultimate analysis
(1) standby coal: clean fine coal is delivered between standby coal car from coal washery by endless belt conveyor, after coal blending and crusher are pulverized, coal is crushed to and is less than below 3mm (accounting for more than 85%) and delivers to tower top by endless belt conveyor, is discharged in coal tower, for coke oven with belt plow.
(2) coking: the main equipment of destructive distillation process is heat accumulation coke oven, it is comprised furnace roof, combustion chamber and coking chamber, chute district, regenerator and forms, and be connected with chimney by flue.The clean fine coal that standby coal workshop section transports, is transported into coal tower by coal transporting trestle, sends in coking chamber by coal loader from hole of coalingging, coal high temperature carbonization at the temperature of 1000 DEG C in coking chamber, after 22 hours, obtain ripe coke, the butt coking yield of coal is as shown in table 3.
Table 3 butt coking yield
Coke oven adopts blast furnace (BF) gas heating, and wherein, analysis of blast furnace gas ingredient is as shown in table 4, is introduced by external pipe.Waste gas after burning enters the flue of downdraft by flue top across aperture, again through regenerator, by checker brick after the part Exposure degree of waste gas, through bottom flue, waste gas exchange shutter, point flue, main flue, chimney, finally enter air.The waste gas of the coal gas of upstream and air and downdraft commutates by heating exchange transmission gear timing.The ash-laden gas produced in process of coalingging enters the dedusting main be made up of interface flap valve after the burning of flue dust collecting car, and enters ground station for dust removal via connecting tube and carry out purifying treatment.
Table 4 analysis of blast furnace gas ingredient
(3) dry coke quenching process: the 1000 DEG C of ripe coke released from coking chamber are accepted by the burnt tank of the circular rotating burnt tank chassis, by lift, burnt tank is promoted to lift headframe top, in the process that lift declines, at the bottom of burnt tank, gate is opened automatically, starts to load red Jiao; Load dry red Jiao putting out stove, after the section of prestoring prestores for some time, along with the carrying out of coke discharging drops to cooling section gradually, 180 DEG C are cooled to by carrying out heat exchange with recycle gas at cooling section, cooled coke is discharged through vibratory feeder, rotary seal valve, chute again, is then transported by Special belt conveyor.
The recycle gas of cooling coke, dry put out stove cooling section and red Jiao carry out heat exchange after temperature raise, and discharge through ring-shaped flue and dryly put out stove; High temperature circulation gas enters coke dry quenching boiler and carries out heat exchange after disposable dust remover separation coarse particles coke powder, boiler develops steam vapor, temperature is down to the cold cycle gas of 160 DEG C by boiler out, after the further separate fine particles coke powder of secondary filter, send into water preheater by recirculation blower and be cooled to about 130 DEG C, then enter the dry stove that puts out and recycle.
(3) burn processing: the raw gas that coal produces in retort process is pooled to coking chamber headspace, enters upcast, the raw gas of 750 DEG C enters effuser through bridge tube, enters the combustion chamber of raw gas combustion power generation system through pipeline.
(4) high temperature raw gas burning, generating: the high temperature raw gas from coke furnace carbonization chamber 750 DEG C is connected with combustion chamber by pipeline, mainly comprise high heating value pyrolysis combustion gas and pyrolysis oil and superheated vapour, combustion chamber adopts the burner of particular design, pyrolysis combustion gas and pyrolysis oil can in combustion chamber Thorough combustion, produce the high-temperature flue gas of 1000 DEG C, meanwhile, the steam in raw gas absorbs heat further and is warming up to 1000 DEG C.Then, combustion product gases and the mixture of steam of 1000 DEG C enter waste heat boiler, the superheated vapour of 420 DEG C is produced with feedwater heat exchange, steam turbine is entered through stop valve, variable valve after the vapor mixing that superheated vapour and dry quenching(of coke) process produce, partial heat energy is converted to the mechanical energy that turbine rotor rotates, drive synchronous generator to rotate and produce electric energy, the electric energy part of generation is personal to be connected to the grid outward.As-fired coal per ton can generate electricity 510kWh, and wherein, high temperature raw gas generated energy is 420kwh, and dry coke quenching superheated steam generation amount is 90kwh.
(5) warm flue gas waste heat recovery in: 400 DEG C of flue gases after residual heat boiler for exchanging heat enter rotary air preheater, combustion chamber combustion air can be preheating to 300 DEG C, because rotary air preheater adopts ceramic honeycomb body material, there is the features such as corrosion resistance nature is strong, wear-resistant, thermal capacity is large, flue-gas temperature can be down to 80 DEG C, in the sensible heat and flue gas of abundant recovered flue gas steam the latent heat of vaporization while, can water of condensation in recovered flue gas, water of condensation is pooled in water collect tank by reclaiming pipe network, the recyclable water of condensation 0.05t of coal per ton.The main component producing flue gas in combustion chamber combustion due to the high temperature raw gas of complicated component is CO
2and water vapour, after waste heat boiler and air preheater heat exchange can after can direct qualified discharge, non-secondary pollution, the defection of traditional oils moisture can be avoided to produce a large amount of reluctant wastewater problem, solve the problem that pyrolysis of coal oil is difficult to disposal and utilization simultaneously, there is good economic benefit and effects of energy saving and emission reduction.
In the description of this specification sheets, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalents thereof.
Claims (7)
1. a power generation system, is characterized in that, comprising:
Coke oven, described coke oven is used for carrying out destructive distillation process to coal, to obtain raw gas and coke;
Combustion chamber, described combustion chamber is connected with described coke oven, for carrying out direct burn processing to described raw gas, to obtain flue gas;
Waste heat boiler, described waste heat boiler is connected with described combustion chamber, utilizes the water in described flue gas and described waste heat boiler to carry out the first heat exchange process, to obtain the flue gas after the first water vapor and cooling; And
Power generation assembly, described power generation assembly is connected with described waste heat boiler, utilizes described first water vapor to generate electricity.
2. system according to claim 1, is characterized in that, comprises further:
Rotary air preheater, described rotary air preheater is connected with described waste heat boiler with described combustion chamber, for utilizing the combustion-supporting gas of the flue gas after described cooling to described combustion chamber to carry out thermal pretreatment, to obtain the flue gas of the combustion-supporting gas after preheating and cooling.
3. system according to claim 1, is characterized in that, comprises further:
Dryly put out stove, the described dry stove that puts out is connected with described coke oven, for described coke and the described dry recycle gas put out in stove are carried out heat exchange process, to obtain the recycle gas after the coke that cools and heating;
Fly-ash separator, described fly-ash separator is connected with the described dry stove that puts out, for carrying out purifying treatment to the recycle gas after described heating, so that the recycle gas after being purified; And
Coke dry quenching boiler, described coke dry quenching boiler is connected with described power generation assembly with described fly-ash separator, the water in the recycle gas after described purification and described coke dry quenching boiler is utilized to carry out the second heat exchange process, to obtain recycle gas and second water vapor of cooling, wherein, described second water vapor is delivered to described power generation assembly and generates electricity.
4. system according to claim 1, is characterized in that, described power generation assembly is turbo-generator.
5. utilize power generation system described in any one of claim 1-4 to carry out the method generated electricity, it is characterized in that, comprising:
Utilize coke oven that coal is carried out destructive distillation process, to obtain coal gas and coke;
Utilize combustion chamber that described raw gas is carried out burn processing, to obtain high-temperature flue gas;
Utilize waste heat boiler that described flue gas and water are carried out the first heat exchange process, to obtain the flue gas after the first water vapor and cooling; And
Described first water vapor is utilized to generate electricity by power generation assembly.
6. method according to claim 5, is characterized in that, comprises further:
Described coke and recycle gas are carried out the second heat exchange process, to obtain the coke of cooling and the recycle gas after heating;
Recycle gas after described heating is carried out purifying treatment, so that the recycle gas after being purified; And
Utilize the recycle gas after described purification and water to carry out the 3rd heat exchange process, to obtain recycle gas and second water vapor of cooling, wherein, described second water vapor is used for generating.
7. method according to claim 5, is characterized in that, comprises further:
The combustion-supporting gas of the flue gas after described cooling to described combustion chamber is utilized to carry out thermal pretreatment, to obtain the flue gas of the combustion-supporting gas after preheating and cooling.
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