CN105275515B - Coke oven flue-gas waste-heat and dry-quenching waste-heat coupled power generation system and coupled power generation method thereof - Google Patents
Coke oven flue-gas waste-heat and dry-quenching waste-heat coupled power generation system and coupled power generation method thereof Download PDFInfo
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Abstract
The invention relates to a coke oven flue-gas waste-heat and dry-quenching waste-heat coupled power generation system and a coupled power generation method thereof. The system comprises a dry-quenching waste-heat recycling device and the dry-quenching waste-heat recycling device comprises a dry-quenching furnace and a dry-quenching waste-heat boiler which are communicated with each other. A dry-quenching secondary superheater, a dry-quenching primary superheater, a first evaporator, a second evaporator, a coke oven flue-gas waste-heat superheater and a dry-quenching economizer are sequentially arranged in the dry-quenching waste-heat boiler. A coke oven flue-gas waste-heat recycling device comprises a coke oven. A coke oven flue-gas main channel is connected to the coke oven and sequentially connected with a coke oven flue-gas waste-heat economizer, a coke oven flue-gas waste-heat evaporator, a coke oven flue-gas draught fan and a coke oven flue-gas chimney. A steam turbine generator unit, the dry-quenching waste-heat recycling device and the coke oven flue-gas waste-heat recycling device form a loop through a condensing unit. According to the coke oven flue-gas waste-heat and dry-quenching waste-heat coupled power generation system and the coupled power generation method, coupled power generation is achieved in the manner that coking flue exhaust fume waste heat enters dry-quenching waste-heat power generation circulation in a coupled manner, and the purposes of efficient utilization of secondary energy and energy saving and emission reduction are achieved.
Description
Technical field
The present invention relates to a kind of waste heat of coke-oven flue gas and dry coke quenching waste heat coupled electricity-generation system and its coupled electricity-generation method, belong to
In cogeneration field.
Background technology
With the fast development of national economy, the production capacity of China's coking industry also experienced the process of rapid growth, according to phase
Pass data shows, 2012, and China has more than 500,000 tons of capacity coke oven 299, up to 408,210,000 tons of coke aggregated capacity.
In the commonly used coking equipment of China and technique, the flue gas temperature that coke oven produces is typically between 220 DEG C -260 DEG C, raw
Producing sensible heat contained by ton coke coke oven exhaust gas is 19426kj/ ton (coke), contained by the coke oven exhaust gas of annual China coking industry can
Reclaim sensible heat up to 7.93 × 1012Kj, is equivalent to 271.4 ten thousand tons of mark calorific value of coal, if this partial heat all reclaims, can reduce discharging
co2About 678.5 ten thousand tons, so2About 4.47810 ten thousand tons, noxAbout 1.56 ten thousand tons, about 277,170,000 tons of dust.
Because the temperature ratio of coke oven exhaust gas is relatively low, this portion of energy is not utilized well, is situated between according to related data
Continue, the utilization rate of this partial heat energy is less than 3%, and huge energy is discharged in air in vain, causes the tight of secondary energy sources
Waste again.At present, some coal chemical enterprises prepare this part of waste heat to be carried out reclaim using organic working medium circulation to generate electricity, organic working medium
Circulating generation has the disadvantage that:
(1) conversion efficiency of thermoelectric is low.
At present, organic working medium circulating technology is also in developing stage, the design of heat to power output equipment,
Manufacturing technology is not also all very perfect, and conversion efficiency of thermoelectric is low by only 8% about.
(2) counter investment is higher.
According to measuring and calculating, for coke oven exhaust gas afterheat generating system, the theoretical pay off period of the organic working medium circulatory system is
5-6, for enterprise, pay off period length is it is more difficult to accept.
Dry coke quenching is for coke wet quenching, is the confession that cryogenic inert gas are passed through coke dry quenching furnace bottom by circulating fan
Device of air blasts in stove and carries out heat exchange with red Jiao, inert gas is heated to high temperature (850 ~ 980 DEG C), by coke dry quenching furnace out
High temperature inert gas enter dry coke quenching residual heat boiler and carry out heat exchange, produce the water vapour of certain pressure, and water vapour enters steam turbine
Carry out heat to power output and drawing generator generates electricity.Cryogenic inert gas after heat release finishes in dry coke quenching residual heat boiler again by
Circulating fan is blasted in stove by the feeder at coke dry quenching furnace bottom and carries out heat exchange with red Jiao, and that is, inert gas recycles.
The advantage of dry coke quenching generation technology is technology maturity, stability height, and conversion efficiency of thermoelectric circulates than organic working medium
High 5%-10%.Fig. 1 is certain coke-oven plant's dry coke quenching electricity generation system schematic diagram, it can be seen that dry coke quenching exhaust gas temperature is
178.5 DEG C, the waste heat boiler thermal efficiency is also low, and due to being expanded due to high-temperature gas, circulating fan power consumption is also higher.With
When, from this figure it can be seen that heat transfer temperature difference is all larger between each heating surface cold and heat source, so dry coke quenching cogeneration technology
Loss is larger.
By discussed above, the coke oven flue gas that a kind of conversion efficiency of thermoelectric of invention is high, technology maturation is reliable, system investments are low
Recovery technology, and by circulating coupling technique, improve the dry coke quenching residual heat boiler thermal efficiency simultaneously, reduce dry quenching circulating fan
The technology of power consumption is that have very much realistic meaning.
Content of the invention
In order to overcome the shortcomings of above prior art presence, the present invention provides a kind of waste heat of coke-oven flue gas and dry coke quenching waste heat
Coupled electricity-generation system and its coupled electricity-generation method, coking chimney meatus transmitting smoke waste heat are coupled into the coupling of dry coke quenching cogeneration circulation
Close and generate electricity, thus reaching the purpose of efficient utilization secondary energy sources and energy-saving and emission-reduction.
In order to solve above-mentioned technical problem, the present invention employs the following technical solutions:
A kind of waste heat of coke-oven flue gas and dry coke quenching waste heat coupled electricity-generation system, comprising:
Dry coke quenching waste-heat recovery device, dry coke quenching waste-heat recovery device includes the coke dry quenching furnace being interconnected and dry coke quenching waste heat
Boiler, the internal dry coke quenching secondary superheater including setting gradually of dry coke quenching residual heat boiler, cork dry quenching disposable superheater, the first steaming
Send out device, the second evaporimeter, waste heat of coke-oven flue gas superheater and dry coke quenching economizer；
Smoke waste heat recycling device for coke oven, smoke waste heat recycling device for coke oven includes coke oven, and coke oven is connected with coke oven cigarette
Gas flue collector, the connection of coke oven flue gas flue collector sets gradually waste heat of coke-oven flue gas economizer, waste heat of coke-oven flue gas evaporimeter, coke oven
Smoke induced draught fan and coke oven flue gas chimney；
Turbo-generator Set includes steam turbine and generator；
Condensing unit includes condenser and condensate pump；
Turbo-generator Set passes through condensing unit and dry coke quenching waste-heat recovery device and smoke waste heat recycling device for coke oven shape
Become loop.
Preferably, above-mentioned waste heat of coke-oven flue gas and dry coke quenching waste heat coupled electricity-generation system, also include oxygen-eliminating device, deoxygenation
Utensil has low-pressure steam mouth, high steam mouth, condenses the mouth of a river and the deoxygenation mouth of a river；Wherein high steam mouth is through dry coke quenching residual heat boiler
Feed pump is connected with the dry coke quenching economizer of dry coke quenching residual heat boiler, and low-pressure steam mouth connects coke oven cigarette through waste heat of coke oven feed pump
It is connected with the waste heat of coke-oven flue gas superheater of dry coke quenching residual heat boiler through waste heat of coke-oven flue gas evaporimeter after gas waste heat economizer, coagulate
Bear water mouth and connect bleeder heater, bleeder heater is also connected with condensate pump, the coke oven through dry coke quenching residual heat boiler for the deoxygenation mouth of a river
Fume afterheat superheater is connected with Turbo-generator Set.
Preferably, above-mentioned waste heat of coke-oven flue gas and dry coke quenching waste heat coupled electricity-generation system, dry coke quenching secondary superheater with
It is connected with attemperator between cork dry quenching disposable superheater.
Preferably, above-mentioned waste heat of coke-oven flue gas and dry coke quenching waste heat coupled electricity-generation system, set in dry coke quenching residual heat boiler
It is equipped with dry coke quenching drum, dry coke quenching drum is simultaneously connected with cork dry quenching disposable superheater, the first evaporimeter, the second evaporimeter and dry puts out
Burnt economizer.
Preferably, above-mentioned waste heat of coke-oven flue gas and dry coke quenching waste heat coupled electricity-generation system, the first evaporimeter is naked pipe formula
Evaporimeter, the second evaporimeter is tubular evaparator.
A kind of waste heat of coke-oven flue gas and dry coke quenching waste heat coupled electricity-generation method, using waste heat of coke-oven flue gas as dry coke quenching waste heat
The external low-temperature heat source of boiler, the low-pressure saturated steam heating of low temperature coke oven exhaust gas being obtained using red Jiao of coke dry quenching furnace middle temperature waste heat
Carry out reheating, and the high temperature and high pressure steam being produced with dry coke quenching residual heat boiler is shared a Turbo-generator Set and generates electricity, and does
The high-temperature steam that quenching waste heat boiler produces enters the acting of steamer owner's vapour, and waste heat of coke-oven flue gas is common with dry coke quenching middle temperature waste heat
The cryogenic overheating steam producing enters steam turbine filling acting, by cogeneration circulation coupling different and separate for two efficiency
It is combined into a main hot repair vapour formula power generation cycle.
The present invention has a following technical advantage:
1) used heat of coking flue is changed into high-quality electric energy it is achieved that the higher value application of secondary energy sources by the present invention,
Decrease the waste of secondary energy sources.
2) using circulation coupling technique by low product heat energy upgrading, low product heat energy power-generating cycle efficieny is made to improve, low product heat energy
Powergenerationcycleefficiency improves about 13%.
3) low product steam heat absorption is utilized to reduce dry coke quenching residual heat boiler exhaust gas temperature, the heat improving dry coke quenching inert gas is returned
Yield, inert gas heat recovery rate improves about 5%.
4) reduce the import temperature difference of dry coke quenching economizer, the loss of dry coke quenching economizer reduces by 21% about.
5) low product heat energy and high product heat energy share a set of TRT, eliminate the heat to electricity conversion of low product heat energy power-generating and coagulate
Vapour equipment, system significantly simplifies, and investment is greatly lowered.
6) low product heat energy and high product heat energy share a set of TRT, simplify system management efforts.
7) low product heat energy and high product heat energy share a set of TRT, drastically reduce the area floor space.
8) because dry coke quenching residual heat boiler exhaust gas temperature reduces, circulating fan power consumption reduces, and reduced rate is about 20%.
Brief description
Fig. 1 is the structural representation of the embodiment of the present invention；
In figure: 1-- coke dry quenching furnace；2-- dry coke quenching secondary superheater；3-- cork dry quenching disposable superheater；4-- first evaporimeter；
5-- attemperator；6-- second evaporimeter；7-- dry coke quenching drum；8-- waste heat of coke-oven flue gas superheater；9-- dry coke quenching economizer；
10-- steam turbine；11-- generator；12-- condenser；13-- condensate pump；14-- bleeder heater；15-- oxygen-eliminating device；16--
Waste heat of coke oven feed pump；17-- dry coke quenching residual heat boiler feed pump；18-- coke oven flue gas chimney；19-- coke oven flue gas air-introduced machine；
20-- waste heat of coke-oven flue gas evaporimeter；21-- waste heat of coke-oven flue gas drum；22-- waste heat of coke-oven flue gas economizer；23-- coke oven
Flue gas flue collector；24-- coke oven；25 dry quenching circulating fans.
Specific embodiment
Understand for the ease of those skilled in the art, with specific embodiment, the present invention is made further specifically below in conjunction with the accompanying drawings
Bright.
Referring to Fig. 1, a kind of waste heat of coke-oven flue gas and dry coke quenching waste heat coupled electricity-generation system, include dry coke quenching waste heat recovery and fill
Put, smoke waste heat recycling device for coke oven, Turbo-generator Set and condensing unit；Wherein dry coke quenching waste-heat recovery device
Including the coke dry quenching furnace 1 being interconnected and dry coke quenching residual heat boiler；Include inside dry coke quenching residual heat boiler setting gradually
Dry coke quenching secondary superheater 2, cork dry quenching disposable superheater 3, the first evaporimeter 4, the second evaporimeter 6, waste heat of coke-oven flue gas mistake
Hot device 8 and dry coke quenching economizer 9, are additionally provided with dry coke quenching drum 7 inside dry coke quenching residual heat boiler, dry coke quenching drum 7 connects simultaneously
Connect cork dry quenching disposable superheater 3, the first evaporimeter 4, the second evaporimeter 6 and dry coke quenching economizer 9；Waste heat of coke-oven flue gas reclaims dress
Put including coke oven 24, coke oven 24 is connected with coke oven flue gas flue collector 23, coke oven flue gas flue collector 23 connection sets gradually coke oven
Fume afterheat economizer 22, waste heat of coke-oven flue gas evaporimeter 20, coke oven flue gas air-introduced machine 19 and coke oven flue gas chimney 18；Steamer
Generating set includes steam turbine 10 and generator 11；Condensing unit includes condenser 12 and condensate pump 13；Steam turbine generator
Group forms loop by condensing unit with dry coke quenching waste-heat recovery device and smoke waste heat recycling device for coke oven.
In the present embodiment, also include oxygen-eliminating device 15, oxygen-eliminating device 15 has low-pressure steam mouth, high steam mouth, condensate
Mouth and the deoxygenation mouth of a river；The wherein dry coke quenching through dry coke quenching residual heat boiler feed pump 17 and dry coke quenching residual heat boiler for the high steam mouth saves
Coal device 9 connects, and low-pressure steam mouth connects after waste heat of coke-oven flue gas economizer 22 through more than coke oven flue gas through waste heat of coke oven feed pump 16
Hot vaporizer 20 is connected with the waste heat of coke-oven flue gas superheater 8 of dry coke quenching residual heat boiler, condenses the mouth of a river and connects back to hot heater 14,
Bleeder heater 14 is also connected with condensate pump 13, the waste heat of coke-oven flue gas superheater 8 through dry coke quenching residual heat boiler for the deoxygenation mouth of a river with
Turbo-generator Set connects.
In the present embodiment, between dry coke quenching secondary superheater 2 and cork dry quenching disposable superheater 3, it is connected with attemperator 5.
In the present embodiment, the first evaporimeter 4 is naked tubular evaparator, and the second evaporimeter 6 is tubular evaparator.
A kind of waste heat of coke-oven flue gas and dry coke quenching waste heat coupled electricity-generation method, using waste heat of coke-oven flue gas as dry coke quenching waste heat
The external low-temperature heat source of boiler, is steamed using the low pressure saturation that the middle temperature waste heat of red Jiao of coke dry quenching furnace 1 obtains to the heating of low temperature coke oven exhaust gas
Vapour carries out reheating, and the high temperature and high pressure steam being produced with dry coke quenching residual heat boiler is shared a Turbo-generator Set and generates electricity,
The high-temperature steam that dry coke quenching residual heat boiler produces enters the acting of steamer owner's vapour, and waste heat of coke-oven flue gas is with dry coke quenching middle temperature waste heat altogether
Enter steam turbine filling acting with the cryogenic overheating steam producing, by cogeneration circulation different and separate for two efficiency
It is coupled as a main hot repair vapour formula power generation cycle.
The specific workflow of the present invention is as follows:
1) dry coke quenching inert gas workflow
Inert gas absorbs in coke dry quenching furnace 1 after red Jiao's sensible heat produces high temperature inert gas and enters dry coke quenching residual heat boiler,
In dry coke quenching residual heat boiler, high temperature inert gas are successively in dry coke quenching secondary superheater 2, cork dry quenching disposable superheater 3, first
To high pressure acting working medium heat release fall in evaporimeter 4, the second evaporimeter 6, waste heat of coke-oven flue gas superheater 8, dry coke quenching economizer 9
Temperature, forms the relatively low dry coke quenching residual heat boiler smoke evacuation of temperature, and dry coke quenching residual heat boiler smoke evacuation acts in dry quenching circulating fan 25
Under reenter coke dry quenching furnace 1 and absorb heat, enter next dry coke quenching waste heat recovery process.
2) coke oven flue gas flow process
The coke oven flue gas that coke oven 24 production process produces, through coke oven flue gas flue collector 23, sequentially enter waste heat of coke-oven flue gas and save
Coal device 22, waste heat of coke-oven flue gas evaporimeter 20, to low pressure acting working medium heat release, form 110 DEG C about of coke oven flue gas smoke evacuation, and
Enter air through coke oven flue gas chimney 18 in the presence of coke oven flue gas air-introduced machine 19.
3) dry coke quenching cogeneration circulation is major cycle carbonated drink flow process
Deaerated water after dry coke quenching residual heat boiler feed pump 17 pressurization, through dry coke quenching economizer 9, the second evaporimeter 6, the
The heating surfaces such as one evaporimeter 4, cork dry quenching disposable superheater 3, dry coke quenching secondary superheater 2 are inhaled successively from dry coke quenching inert gas
Heat, ultimately forms the main steam of HTHP.Main steam enters described -- and simultaneously drawing generator 11 generates electricity for steam turbine 10 acting.Do
Main steam after work(forms exhaust steam, and enters described condenser 12 and condense into condensate.Condensate is in the work of institute's condensate pump 13
Enter the heating that bleeder heater 14 acceptance is drawn gas with lower, subsequently into oxygen-eliminating device 15 deoxygenation, deaerated water is again introduced into dry coke quenching
Waste heat boiler, carries out next power cycle.
4) waste heat of coke-oven flue gas power generation cycle is coupling cycle carbonated drink flow process
Deaerated water sequentially enters waste heat of coke-oven flue gas economizer 22, waste heat of coke-oven flue gas through waste heat of coke oven feed pump 16 pressurization
In evaporimeter 20, state the coke oven flue gas that 24 production processes produce from coke oven and absorb heat, low pressure acting working medium becomes low by aqueous water
Pressure saturated vapor, after low-pressure saturated steam leaves waste heat of coke-oven flue gas evaporimeter 20, is coupled into dry coke quenching residual heat boiler, in Jiao
The middle temperature waste heat of dry coke quenching inert gas is absorbed, low-pressure saturated steam forms low-pressure superheated steam in furnace flue gas exhaust heat superheater 8,
Low-pressure superheated steam enters steam turbine 10 acting, and simultaneously drawing generator 11 together with main vapour generates electricity.Filling after acting and main vapour one
Rise and form exhaust steam, and enter condenser 12 and condense into condensate.Condensate enters backheat heating in the presence of condensate pump 13
The heating that device 14 acceptance is drawn gas, subsequently into oxygen-eliminating device 15 deoxygenation, deaerated water pressurizes through waste heat of coke oven feed pump 16 again, carries out
Next power cycle.
Above-described embodiment is merely to illustrate technical scheme and is not intended to limit, although by embodiment to this
Bright be described in detail, art personnel should modify or to portion of techniques with reference to the concrete mode of the present invention
Feature carries out equivalent, but under the spirit without departing from technical solution of the present invention, above-mentioned change or equivalent should belong to
In the technical scheme scope that the present invention is claimed.
Claims (5)
1. a kind of waste heat of coke-oven flue gas and dry coke quenching waste heat coupled electricity-generation system are it is characterised in that include:
Dry coke quenching waste-heat recovery device, dry coke quenching waste-heat recovery device includes the coke dry quenching furnace (1) being interconnected and dry coke quenching waste heat
Boiler, the dry coke quenching secondary superheater (2) including inside dry coke quenching residual heat boiler setting gradually, cork dry quenching disposable superheater (3),
First evaporimeter (4), the second evaporimeter (6), waste heat of coke-oven flue gas superheater (8) and dry coke quenching economizer (9)；
Smoke waste heat recycling device for coke oven, smoke waste heat recycling device for coke oven includes coke oven (24), and coke oven is connected with Jiao on (24)
Kiln gas flue collector (23), coke oven flue gas flue collector (23) connection sets gradually waste heat of coke-oven flue gas economizer (22), coke oven cigarette
Gas residual evaporator (20), coke oven flue gas air-introduced machine (19) and coke oven flue gas chimney (18)；
Turbo-generator Set includes steam turbine (10) and generator (11)；
Condensing unit includes condenser (12) and condensate pump (13)；
Turbo-generator Set is passed through condensing unit and is formed back with dry coke quenching waste-heat recovery device and smoke waste heat recycling device for coke oven
Road.
2. according to claim 1 waste heat of coke-oven flue gas and dry coke quenching waste heat coupled electricity-generation system it is characterised in that: also include
There is oxygen-eliminating device (15), oxygen-eliminating device (15) has low-pressure steam mouth, high steam mouth, condenses the mouth of a river and the deoxygenation mouth of a river；Its mesohigh
Steam port is connected with the dry coke quenching economizer (9) of dry coke quenching residual heat boiler through dry coke quenching residual heat boiler feed pump (17), and low pressure is steamed
Steam ports connects waste heat of coke-oven flue gas economizer (22) by waste heat of coke-oven flue gas evaporimeter (20) through waste heat of coke oven feed pump (16)
It is connected with the waste heat of coke-oven flue gas superheater (8) of dry coke quenching residual heat boiler, condense the mouth of a river and connect back to hot heater (14), backheat adds
Hot device (14) is also connected with condensate pump (13), the waste heat of coke-oven flue gas superheater (8) through dry coke quenching residual heat boiler for the deoxygenation mouth of a river with
Turbo-generator Set connects.
3. according to claim 1 waste heat of coke-oven flue gas and dry coke quenching waste heat coupled electricity-generation system it is characterised in that: dry coke quenching
It is connected with attemperator (5) between secondary superheater (2) and cork dry quenching disposable superheater (3).
4. according to claim 1 waste heat of coke-oven flue gas and dry coke quenching waste heat coupled electricity-generation system it is characterised in that: dry coke quenching
It is provided with dry coke quenching drum (7), dry coke quenching drum (7) is simultaneously connected with cork dry quenching disposable superheater (3), the first steaming in waste heat boiler
Send out device (4), the second evaporimeter (6) and dry coke quenching economizer (9).
5. waste heat of coke-oven flue gas and dry coke quenching waste heat coupled electricity-generation system according to any one of Claims 1-4, its feature exists
In: the first evaporimeter is naked tubular evaparator, and the second evaporimeter is tubular evaparator.
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| CN106642042A (en) * | 2017-01-23 | 2017-05-10 | 中冶焦耐(大连)工程技术有限公司 | Intermediate reheat power generation process and system for coke dry quenching boiler |
| CN106989611B (en) * | 2017-05-18 | 2023-11-24 | 中冶华天南京工程技术有限公司 | Coke oven gas and dry quenching waste heat comprehensive power generation system |
| CN107013269A (en) * | 2017-05-18 | 2017-08-04 | 中冶华天南京工程技术有限公司 | The heat power generating system recycled based on coke-oven plant's residual heat resources |
| CN107014218B (en) * | 2017-05-18 | 2023-10-31 | 中冶华天南京工程技术有限公司 | Thermal power generation system based on waste heat and complementary energy integrated utilization of coking plant |
| CN107514914A (en) * | 2017-08-23 | 2017-12-26 | 萍乡市华星化工设备填料有限公司 | New Type Coke Oven flue gas waste heat recovery apparatus |
| CN109281713A (en) * | 2018-11-19 | 2019-01-29 | 广东工业大学 | A kind of coke oven steam electric power generator |
| CN110207081A (en) * | 2018-12-18 | 2019-09-06 | 西安华江环保科技股份有限公司 | A kind of subcritical superhigh temperature reheat boiler therrmodynamic system of dry coke quenching |
| CN111139090A (en) * | 2019-12-27 | 2020-05-12 | 中冶焦耐(大连)工程技术有限公司 | Ultralow-load operation method of dry quenching system |
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| JPS5923591B2 (en) * | 1978-05-26 | 1984-06-02 | 日本鋼管株式会社 | Coke oven gas heat recovery method |
| DE4036305A1 (en) * | 1989-11-14 | 1991-05-16 | Sumitomo Metal Ind | Optimum operation of coke dry quenching system - is based on processing of data from preceding operation |
| CN101725954B (en) * | 2008-10-24 | 2012-05-23 | 同济大学 | Novel process for coupling utilization of waste heat recovery of riser of coke oven and coke dry quenching system |
| CN104213951B (en) * | 2013-06-03 | 2017-11-28 | 盾安（天津）节能***有限公司 | Waste heat of coke oven is multigroup to utilize system |
| CN103952162B (en) * | 2014-04-16 | 2016-01-06 | 上海交通大学 | A kind of coke oven Exposure degree technique |
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