CN102746857B - Low-cost high-efficiency coke oven residual heat recovery system - Google Patents
Low-cost high-efficiency coke oven residual heat recovery system Download PDFInfo
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- CN102746857B CN102746857B CN2012101693107A CN201210169310A CN102746857B CN 102746857 B CN102746857 B CN 102746857B CN 2012101693107 A CN2012101693107 A CN 2012101693107A CN 201210169310 A CN201210169310 A CN 201210169310A CN 102746857 B CN102746857 B CN 102746857B
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- coke oven
- flue
- pressure gauge
- heat recovery
- controller
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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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
Abstract
The invention relates to a coke oven residual heat recovery energy-saving modification technology, and discloses a low-cost high-efficiency coke oven residual heat recovery system. The system comprises a coke oven. The rear part of a combustion chamber of the coke oven is connected to a chimney through an exit flue. A regulating valve is arranged in the exit flue, and divides the exit flue into an inner flue and an outer flue. A system controlling apparatus is arranged in the inner flue. The system is characterized in that: a flue gas recovery extracting apparatus is arranged in the outer flue. The apparatus comprises an exhaust controller, and an exhauster, a pressure gauge, and a temperature gauge connected with the outer flue. The exhaust controller is simultaneously connected to input terminals of the pressure gauge and the temperature gauge. The controller is connected to the exhauster, and controls the exhauster. The exhauster is connected to a drying system outside. With an existing coke oven residual heat recovery system, an extracting point is not properly selected, the system is not easy to control, the cost is high, and flue gas extraction rate is restricted. With the system provided by the invention, the problems are overcome. The invention is mainly used in modifications of heat recovery systems of coke ovens and similar operating conditions.
Description
(i) technical field: the present invention relates to the waste heat recovering energy conserving renovation technique of coke oven, especially a kind of low-cost high-efficiency coke oven residual neat recovering system.
(ii) prior art: coke oven is present widely used coal carbonization technology equipment, its composition is shown in Fig. 1, coke oven has coking chamber 1, the outer mobile ram 2 that is equipped with of coking chamber 1, the combustion chamber 3 that heat supply is used is established in the coking chamber bottom, be provided with many row's burners 4 in the combustion chamber of employing heat storage technology, mobile feeder 5 is equipped with at the coking chamber top.During production, ram is released one by one off and on ripe Jiao and is loaded new coal to be refined, combustion chamber continuous heat supply by feeder; The waste gas in combustion chamber afterburnt, by inside and outside flue 7 and 11, control valve 10, sees appendix 1 with keeping the chimney 12(that stablizes negative pressure) be communicated with and discharge out of the furnace.Operating mode at intermittence due to coking chamber, must cause the internal pressure of combustion chamber fluctuation, for fluctuating in balance cylinder, be provided with system controller 6 automatic controls or manual control valve 10, Pressure gauge 8, thermometer 9 on inner flue, maintain dynamically internal pressure of combustion chamber to guarantee stable heating.
For energy cascade utilization, in the waste gas that chimney is effluxed, waste heat, fully for adjusting the water content into the stokehold raw coal, to guarantee coke quality and to save the energy, just must extract waste gas from former flue gas emission; And it is necessary to extract waste gas: first does not affect coking while extracting normally moves, and second can switch rapidly while not taking out waste gas is discharged from former chimney, the 3rd meet under the first two condition can extract to greatest extent waste gas for the production of.
At present domestic is mainly introduction of foreign technology, and at inner flue, 7 places establish fume extraction point (see figure 2).Owing to being subject to the frequent irregular fluctuation impact of load in burner hearth 3 internal pressures, be difficult under the operating mode of balance, increase again the air exhauster load of a variation, the Mathematical Modeling of its control logic is n+M equation with many unknowns, cause the system controller bulky complex, cost is high, fault is many, and the extraction amount of waste gas is restricted; Generally all be less than 70%, finally have influence on the efficiency of whole system waste heat recovery and stablizing of system.
(iii) summary of the invention: purpose of the present invention will solve exactly existing coke oven waste heat and extract that the recovery system configuration is complicated, cost is high, trouble point is many, and little problem is measured in the extraction of waste gas, and a kind of low-cost high-efficiency coke oven residual neat recovering system is provided.
Concrete scheme of the present invention is: for existing coke oven residual neat recovering system, improved, it includes coke oven, coke oven top is provided with several coking chambers, portable ram is housed in coking chamber, the coke oven bottom is combustion chamber, be provided with many row's burners in combustion chamber, portable feeder is equipped with at the top of coke oven, the afterbody of coke oven combustion chamber connects chimney by smokejack, control valve is installed in smokejack, control valve is divided into inner flue and external flue by smokejack, in inner flue, tipping has Pressure gauge and thermometer, dispose system controller, system controller respectively with Pressure gauge, thermometer, control valve connects, it is characterized in that: the off-gas recovery draw-out device is installed in external flue, this device includes air draft controller, the air exhauster be connected with external flue, pressure gauge, temperature measuring gauge, described air draft controller is inputted and is connected simultaneously with pressure gauge and temperature measuring gauge, and controller control connection air exhauster, the external drying system of air exhauster.
Design principle (see figure 3) of the present invention is: 1) retain the former control system of coke oven constant, retain flue adjusted valve 10 and system controller 6 thereof, Pressure gauge 8, thermometer 9 is constant, as long as guarantee that stack draught is constant, the normal operation of coke oven will keep former operating mode.2) extraction point of waste gas is arranged in to 11 sections of external flues.According to the Basque law, the negative pressure at this place is consistent with chimney, and, from annex 1 demonstration, the draft of chimney is only relevant with the temperature of the column of smoke in chimney, irrelevant with exhaust gas volumn.Extracting the quantity of flue gas 1. has the column of smoke to maintain in chimney as long as meet; 2. the heat that its tolerance that maintains the column of smoke discharges and chimney surface radiating amount balance, to keep the temperature of chimney, can proceed to rapidly normal operation stopping bleeding while changing the chimney exhaust into.Through measuring and calculating, maintain 3% summer in south, maintain 5% exhausted air quantity winter, just can guarantee normal conversion.This waste gas extraction system is by air exhauster 13, pressure gauge 15, and temperature measuring gauge 16 and air draft controller 14 form (see figure 3)s.Air draft controller is only followed the tracks of pressure gauge 15 like this, with reference to temperature measuring gauge 16, guarantees that the stable negative pressure of chimney gets final product, and the mathematical model of its control logic is simplified to linear equation with one unknown.This system configuration is simple, cheap, be easy to control, and failure rate is low, waste gas extraction amount is greater than 95%, and the control section cost is only 1/10 of imported technology, and this argument is correct through test.Prove as follows:
The formula of stack draught is:
S=Hyz
....①
In formula: the natural draft pa of S---chimney;
---severe 13.132 N/NM of flue gas under standard state
3
Tk---outside air temperature
0C;
The mean temperature of flue gas in ty---chimney
0C;
Hyz---chimney height m;
The local atmospheric pressure pa of P1---;
P---standard atmospheric pressure 101330pa
Example: as ground temperature tk=0
OC, height above sea level 2000m look into P
1=79500pa. chimney height Hyz=185m.
As ty from 50-250
OWhen C changes by 1. formula of every given data substitution: have
When: ty=50
OS=-228pa during C
Ty=100
OS=-444pa during C
Ty=150
OS=-609pa during C
Ty=200
OS=-739pa during C
Ty=250
OS=-844pa during C
Referring to Fig. 4, under the constant condition of chimney height Hyz and ambient temperature, by the mean temperature ty of the column of smoke in chimney, determine negative pressure value (being draft).Irrelevant with the exhaust gas volumn by chimney in the certain flow rate scope, that is to say normally in service, no matter load variations causes under the operating mode by the chimney smoke quantitative change, as long as flue-gas temperature is constant, its negative pressure is certain value.According to the Basque law, valve external flue 11 negative pressure are certain value.
The various waste heats extractions that the present invention can be applicable to similar operating mode utilize engineering.Its fume extraction amount was brought up to and was greater than 95% by originally being less than 70%.Application the present invention smelts the exhausted air quantity of producing coke generation per ton and is about 1266NM
3/ t, exhaust temperature is 225
OC-250
OThe C left and right, the heat content in producer's discharging waste gas of annual output 2200000 t/ coke scales is 2.106 * 10
11Kcal/, for material drying, conversion q
yThe work coal of dw=5000kcal/kg, sulfur content 2%, 1200 yuan/t of valency ≈ is 32836t/, reduces discharging CO
2For 76804t/, reduce discharging SO
2For 1313t/, energy-saving benefit is 3,940 ten thousand yuan/year.The reduction of discharging energy-saving benefit is huge.
(iv) accompanying drawing explanation:
Fig. 1 is existing coke oven system architecture schematic diagram;
Fig. 2 is that existing coke oven waste heat extracts the recovery system structural representation;
Fig. 3 is general structure schematic diagram of the present invention;
Fig. 4 is the graph of relation of column of smoke mean temperature ty in stack draught S and chimney.
In figure, 1-coking chamber, 2-ram, 3-combustion chamber, 4-burner, 5-feeder, the 6-system controller, 7-inner flue, 8-Pressure gauge, 9-thermometer, 10-control valve, 11-external flue, the 12-chimney, 13-air exhauster, 14-air draft controller, 15-pressure gauge, 16-temperature measuring gauge.
(v) the specific embodiment:
Referring to Fig. 3, the present invention includes coke oven, coke oven top is provided with several coking chambers 1, portable ram 2 is housed outside coking chamber 1, the coke oven bottom is combustion chamber 3, be provided with many row's burners 4 in combustion chamber 3, portable feeder 5 is equipped with at the top of coke oven 1, the afterbody of coke oven 1 combustion chamber 3 connects chimney 12 by smokejack, control valve 10 is installed in smokejack, control valve 10 is divided into inner flue 7 and external flue 11 by smokejack, in inner flue 7, tipping has Pressure gauge 8 and thermometer 9, dispose system controller 6, system controller 6 respectively with Pressure gauge 8, thermometer 9, control valve 10 connects, particularly: the off-gas recovery draw-out device is installed in external flue 11, this device includes air draft controller 14, the air exhauster 13 be connected with external flue 11, pressure gauge 15, temperature measuring gauge 16, described air draft controller 14 is inputted and is connected simultaneously with pressure gauge 15 and temperature measuring gauge 16, and controller 14 control connection air exhausters 13, the external drying system of air exhauster 13.
When the present invention works, control air exhauster 13 work by air draft controller 14, pressure gauge 15 records the negative pressure value input air draft controller 14 of external flue 11, in the situation that the negative pressure value in guaranteeing external flue 11 is not less than stack draught, can extracts to greatest extent flue gas and is recycled.When observing pressure gauge 15, coordinate the variation of observing temperature measuring gauge 16, to guarantee the normal operation of system, under normal circumstances, two tables should be stablized, and change little.Pressure or temperature in flue have larger variation, and controller will be adjusted air exhauster work immediately, recover normally operation.
Claims (1)
1. a low-cost high-efficiency coke oven residual neat recovering system, include coke oven, coke oven top is provided with several coking chambers, coking chamber is equipped with portable ram outward, the coke oven bottom is combustion chamber, be provided with many row's burners in combustion chamber, portable feeder is equipped with at the top of coke oven, the afterbody of coke oven combustion chamber connects chimney by smokejack, control valve is installed in smokejack, control valve is divided into inner flue and external flue by smokejack, in inner flue, tipping has Pressure gauge and thermometer, dispose system controller, system controller respectively with Pressure gauge, thermometer, control valve connects, it is characterized in that: the off-gas recovery draw-out device is installed in external flue, this device includes air draft controller, the air exhauster be connected with external flue, pressure gauge, temperature measuring gauge, described air draft controller is inputted and is connected simultaneously with pressure gauge and temperature measuring gauge, and air draft controller control connection air exhauster, the external drying system of air exhauster.
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| CN2012101693107A CN102746857B (en) | 2012-05-29 | 2012-05-29 | Low-cost high-efficiency coke oven residual heat recovery system |
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| CN2012101693107A CN102746857B (en) | 2012-05-29 | 2012-05-29 | Low-cost high-efficiency coke oven residual heat recovery system |
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| CN102746857A CN102746857A (en) | 2012-10-24 |
| CN102746857B true CN102746857B (en) | 2013-12-04 |
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| CN104836376A (en) * | 2015-05-15 | 2015-08-12 | 成都中冶节能环保工程有限公司 | Thermal sensitive type coke oven waste heat power generation system based on boost power supply circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201417094Y (en) * | 2009-06-12 | 2010-03-03 | 成都四通科技投资有限公司 | Waste heat recovery power generation flue system for glass production line |
| CN202626106U (en) * | 2012-05-29 | 2012-12-26 | 黄石市建材节能设备总厂 | Low-cost high-efficient coke oven waste heat recovery system |
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|---|---|---|---|---|
| JPH05117660A (en) * | 1991-10-25 | 1993-05-14 | Sumitomo Metal Ind Ltd | Method for controlling combustion in coke oven |
| TW409142B (en) * | 1997-03-25 | 2000-10-21 | Kawasaki Steel Co | Method of operating coke and apparatus for implementing the method |
| JP2002180066A (en) * | 2000-12-15 | 2002-06-26 | Nippon Steel Corp | Apparatus for humidity control of coal by utilizing waste gas of coke oven |
| KR100743192B1 (en) * | 2006-07-10 | 2007-07-27 | 재단법인 포항산업과학연구원 | Coke oven |
| CN202118867U (en) * | 2011-05-26 | 2012-01-18 | 太原化工股份有限公司 | Coke-oven smoke gas waste heat reutilizing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201417094Y (en) * | 2009-06-12 | 2010-03-03 | 成都四通科技投资有限公司 | Waste heat recovery power generation flue system for glass production line |
| CN202626106U (en) * | 2012-05-29 | 2012-12-26 | 黄石市建材节能设备总厂 | Low-cost high-efficient coke oven waste heat recovery system |
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Effective date of registration: 20230403 Address after: No.16, Wangsheng Avenue East, Jinshan sub district office, Huangshi City, Hubei Province Patentee after: HUBEI JINLU ENERGY SAVING CO.,LTD. Address before: No. 161-1, Hangzhou West Road, Huangshi City, Hubei Province Patentee before: Huangshi Building Material Energy Saving Equipment Factory |