CN103940213A - Coke drying system dry gas temperature and flow self-adjustment control device and method - Google Patents

Coke drying system dry gas temperature and flow self-adjustment control device and method Download PDF

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Publication number
CN103940213A
CN103940213A CN201410138216.4A CN201410138216A CN103940213A CN 103940213 A CN103940213 A CN 103940213A CN 201410138216 A CN201410138216 A CN 201410138216A CN 103940213 A CN103940213 A CN 103940213A
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waste gas
temperature
dry gas
coke
flow
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CN201410138216.4A
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CN103940213B (en
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林祥海
颜新
肖卫锋
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CISDI Engineering Co Ltd
CISDI Shanghai Engineering Co Ltd
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CISDI Engineering Co Ltd
CISDI Shanghai Engineering Co Ltd
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Abstract

The invention discloses a coke drying system dry gas temperature and flow self-adjustment control device and method. A high-temperature waste gas branch pipe and a low-temperature waste gas branch pipe are arranged at the front end and the rear end of a heat exchanger, flow control valves are arranged on the branch pipes, a temperature sensor is arranged on a dry gas header pipe behind an induced draft fan, and high-temperature waste gas and low-temperature waste gas are controlled by the temperature sensor and the flow control valves on the two branch pipes to be mixed to reach the temperatures needed by the coke drying process. The high-temperature hot blast stove flue waste gas branch pipe and the low-temperature hot blast stove flue waste gas branch pipe are arranged at the front position and the rear position of the hot blast stove flue waste gas heat exchanger, flow of the two branch pipes is controlled through feedback of the temperature sensor, the dry gas temperature self-adjustment function can be achieved, graded recycling of hot blast stove flue waste flue gas heat can also be achieved, waste of waste gas heat is avoided, and remarkable economic benefits and energy-saving benefits are achieved.

Description

Coke drying system dry gas temperature and flow quantity self-adjusting joint control device and method
Technical field
The invention belongs to adjusting, control technology field, can be used for the adjusting control of dry gas temperature and flow in smelting iron and steel industry coke drying system, be specifically related to a kind of coke drying system dry gas temperature and flow quantity self-adjusting joint control device and method.
Background technology
Coke is requisite raw material in blast furnace iron-making process, and it is most important that its quality is produced stability, technical-economic index and blast furnace crucibe life-span to blast furnace.Because coke water content alters a great deal in the processes such as production, storage, transport, cause into oven coke water content higherly, and coke moisture fluctuation can cause and weighs inaccurately, stablizes thereby affect the working of a furnace.Research shows, the every increase by 1% of coke water content, will increase blast-furnace coke consumption 1.1%~1.3%; When coke water content exceedes 4%, stove dust quantity obviously rises, smooth operation of furnace variation.Thereby, reduce smelter coke water content and there is economy, environmental protection and energy-saving benefit significantly.
For reducing this problem of smelter coke water content, domestic metallargist has proposed to utilize exhaust gas of hot-blast stove waste heat STRENGTH ON COKE to carry out preheating, reaches the coke stoving process that reduces coke moisture object.The useless flue gas producing when exhaust gas of hot-blast stove is Combustion of Hot Air Furnace, its key component is the inert medias such as CO2, N2, and temperature can reach 300 DEG C of left and right, and after heat exchanger, its temperature is reduced to 150 DEG C of left and right.In existing report, utilize exhaust gas of hot-blast stove mainly to comprise as the patent of thermal source: the Chinese patent that publication number is CN203007295U discloses a kind of novel blast-furnace exhaust gas of hot-blast stove classification recycle device, this device is blent valve to the adjusting of lowering the temperature of exhaust gas of hot-blast stove temperature by cold wind is set; Publication number is that the Chinese patent of CN102538491A discloses a kind of system and method that utilizes waste gas of hot-blast stove flue baking preheating blast furnace burden, and this system is mended wind by-pass valve control by arranging, and air is introduced to feed bin by secondary air channel road.
The general character of above coke pre-heating drying technique is: in device, be all provided with air duct and carry out the temperature adjusting of dry gas and drive remainder of exhaust gas.But said method is in implementation process, do not consider that cold air enters the following negative effect that coke drying system is brought: (1) coke is a kind of fuel that blast furnace ironmaking provides heat, and cold air can make the oxygen content of dry gas raise, cause coke under the environment of high temperature, elevated oxygen level, to have the potential safety hazard of spontaneous combustion; (2) adopt cold air to regulate dry gas temperature, can waste to a certain extent the heat of exhaust gas of hot-blast stove preciousness.In addition, because said method lacks the means that exhaust gas flow is regulated, thereby the stable operation in variable working condition situation cannot be met, economy, rationally utilization to waste-gas heat can not be realized.
Summary of the invention
In view of this, one of object of the present invention is to provide a kind of coke drying system dry gas temperature and flow quantity self-adjusting joint control device, this device utilizes temperature cascade control loop and flow tandem control loop, realize respectively the useless flue gas heat classification of hot-blast stove and recycle, and the stable operation in variable working condition situation is accurately controlled and maintained to system.
The object of the invention is to be achieved through the following technical solutions, coke drying system dry gas temperature and flow quantity self-adjusting joint control device, comprise heat exchanger, also comprise the high-temp waste gas arm and the low temperature waste gas arm that are separately positioned on heat exchanger rear and front end, described high-temp waste gas arm is connected with dry gas house steward with low temperature waste gas arm, on described dry gas house steward, is provided with temperature sensor; On described high-temp waste gas arm, be provided with first flow control valve, on described low temperature waste gas arm, be provided with second adjustable valve, described temperature sensor is for detection of the temperature of dry gas, under temperature sensor, first flow control valve, the common feedback regulation effect of second adjustable valve three, control waste gas of hot-blast stove flue high temperature and two waste gas arm flows of low temperature, realize high-temp waste gas and low temperature waste gas and be mixed to the needed temperature of coke stoving process.
Further, on the pipeline after air-introduced machine, be disposed with the 3rd flow control valve and flow sensor.
Two of object of the present invention is to provide a kind of coke drying system dry gas temperature and flow quantity self-adjusting joint control method, coke drying system dry gas temperature and flow quantity self-adjusting joint control method, at waste gas of hot-blast stove flue heat exchanger front and back position, high-temp waste gas arm and low temperature waste gas arm are set respectively, set temperature sensor on waste gas header; High-temp waste gas arm and low temperature waste gas arm are passed through respectively to flow control valve, under the feedback regulation of temperature sensor, control the flow of high-temp waste gas arm and low temperature waste gas arm, the two is mixed to the needed temperature of coke stoving process, and as the dry source of the gas of coke drying system, then the dry gas of preparation is caused to burnt groove coke is dried.
Further, the temperature of described dry gas is 200 DEG C~300 DEG C.
Further, described dry gas causes burnt groove by flow control valve.
Useful technique effect:
1) by high temperature not being set at waste gas of hot-blast stove flue heat exchanger front and back position and two of low temperature are got waste gas of hot-blast stove flue arm, not only can realize the self-regulating function of dry gas temperature, recycle but also can realize the useless flue gas heat classification to hot-blast stove, avoid the waste of waste-gas heat, there is significant economic and energy saving benefit;
2) due to cold-air duct not being set, can be coke oven dry inertia (oxygen content is low) environment is provided, effectively ensure the security of system operation, eliminate potential safety hazard, thereby had advantages of safe and reliable;
3) on dry gas house steward, flow sensor and control valve are set, can make the pressure on house steward remain unchanged, by valve opening, exhaust gas flow is carried out to unitary variant and follow the tracks of adjusting, be easy to realize accurate, the stable regulation of variable working condition;
4) air-introduced machine, all the time in determining operating mode operation, can reduce fault rate, thereby extend its service life, plays the effect that reduces investment;
5) can improve the automatic control level of system, reduce Systems Operator's working strength and difficulty.
Brief description of the drawings
In order to make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail, wherein:
Fig. 1 is coke drying system dry gas temperature and flow quantity self-adjusting joint control method and apparatus structure schematic diagram;
In figure: 1, hot-blast stove; 2, the useless flue of hot-blast stove; 3, high-temp waste gas arm; 4, electric butterfly valve; 5, flow control valve; 6, flow control valve; 7, electric butterfly valve; 8, low temperature waste gas arm; 9, heat exchanger; 10, hot-blast stove chimney; 11, temperature sensor; 12, dry gas house steward; 13, air-introduced machine; 14, flow sensor; 15, flow control valve; 16, burnt groove; 17, axial flow blower.
Detailed description of the invention
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail; Should be appreciated that preferred embodiment is only for the present invention is described, instead of in order to limit the scope of the invention.
As shown in Figure 1, be the example structure schematic diagram of coke drying system dry gas temperature and flow quantity self-adjusting joint control device.The coke drying system dry gas temperature of the present embodiment and flow quantity self-adjusting joint control device, comprise hot-blast stove 1, heat exchanger 9, hot-blast stove chimney 10, air-introduced machine 13, burnt groove 16 and axial flow blower 17; Useless flue gas in described hot-blast stove 1 is transported to heat exchanger 9 through the useless flue 2 of hot-blast stove, at the two ends of heat exchanger, high-temp waste gas arm 3 and low temperature waste gas arm 8 are set respectively, on high-temp waste gas arm, set gradually electric butterfly valve 4 and first flow control valve 5 along gas flow, on low temperature waste gas arm, set gradually electric butterfly valve 7 and second adjustable valve 6 along gas flow, after converging, the end of two arms is connected with dry gas house steward 12, dry gas house steward 12 is connected with air-introduced machine 13, and air-introduced machine, burnt groove 16 and axial flow blower 17 are connected successively.On described dry gas house steward, be provided with temperature sensor 11, on the pipeline that connects air-introduced machine and burnt groove, set gradually flow sensor 14 and the 3rd flow control valve 15.
Enter high-temp waste gas arm from a hot-blast stove waste gas part out, another part enters heat exchanger; Discharge through hot-blast stove chimney from a heat exchanger waste gas part out, another part enters low temperature waste gas arm, and the waste gas in two arms is transported to burnt groove STRENGTH ON COKE through air-introduced machine and dries.
Below in conjunction with above-mentioned coke drying system dry gas temperature and flow quantity self-adjusting joint control device, the detailed description of the invention of coke drying system dry gas temperature of the present invention and flow quantity self-adjusting joint control method is elaborated.
The coke drying system dry gas temperature of the present embodiment and flow quantity self-adjusting joint control method, utilize the draft of air-introduced machine 13, outer hot-blast stove waste discharge flue gas is mixed through high-temp waste gas arm 3 and low temperature waste gas arm 8, under the feedback regulation of temperature sensor, pass through to control first flow control valve and the aperture control high-temp waste gas arm of second adjustable valve and the flow of low temperature waste gas arm, the two is mixed to the needed temperature of coke stoving process, as direct medium---the dry gas (200 DEG C~300 DEG C) of drying coke moisture, then the dry gas of preparation being caused to burnt groove dries coke, finally will outside the dry gas after preheating is after dedusting, arrange by axial flow blower 17.
The present embodiment dry gas, entering before burnt groove 16, regulates the flow of dry gas to the needed flow of coke stoving process by the valve opening of flow sensor 14 FEEDBACK CONTROL flow control valves 15.
The present invention is by arranging respectively high temperature at waste gas of hot-blast stove flue heat exchanger front and back position and two of low temperature are got waste gas of hot-blast stove flue arm, feedback by temperature sensor is controlled the flow of two arms, not only can realize the self-regulating function of dry gas temperature, recycle but also can realize the useless flue gas heat classification to hot-blast stove, avoid the waste of waste-gas heat, there is significant economic and energy saving benefit.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if these amendments of the present invention and within modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.

Claims (5)

1. coke drying system dry gas temperature and flow quantity self-adjusting joint control device, comprise heat exchanger, it is characterized in that: also comprise the high-temp waste gas arm and the low temperature waste gas arm that are separately positioned on heat exchanger rear and front end, described high-temp waste gas arm is connected with dry gas house steward with low temperature waste gas arm, on described dry gas house steward, is provided with temperature sensor; On described high-temp waste gas arm, be provided with first flow control valve, on described low temperature waste gas arm, be provided with second adjustable valve, described temperature sensor is for detection of the temperature of dry gas, under temperature sensor, first flow control valve, the common feedback regulation effect of second adjustable valve three, control waste gas of hot-blast stove flue high temperature and two waste gas arm flows of low temperature, realize high-temp waste gas and low temperature waste gas and be mixed to the needed temperature of coke stoving process.
2. coke drying system dry gas temperature according to claim 1 and amount self-regulating control device, is characterized in that: on the pipeline after air-introduced machine, be disposed with the 3rd flow control valve and flow sensor.
3. coke drying system dry gas temperature and flow quantity self-adjusting joint control method, is characterized in that: at waste gas of hot-blast stove flue heat exchanger front and back position, high-temp waste gas arm and low temperature waste gas arm are set respectively, set temperature sensor on waste gas header; High-temp waste gas arm and low temperature waste gas arm are passed through respectively to flow control valve, under the feedback regulation of temperature sensor, control the flow of high-temp waste gas arm and low temperature waste gas arm, the two is mixed to the needed temperature of coke stoving process, and as the dry source of the gas of coke drying system, then the dry gas of preparation is caused to burnt groove coke is dried.
4. coke drying system dry gas temperature according to claim 3 and flow quantity self-adjusting joint control method, is characterized in that: the temperature of described dry gas is 200 DEG C~300 DEG C.
5. coke drying system dry gas temperature according to claim 3 and flow quantity self-adjusting joint control method, is characterized in that: described dry gas causes burnt groove by flow control valve.
CN201410138216.4A 2014-04-08 2014-04-08 Coke drying system is dried temperature and saves control device and method with flow quantity self-adjusting Active CN103940213B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104482751A (en) * 2014-12-11 2015-04-01 华南农业大学 Method and device for eliminating thermal inertia of hot air drier
CN106066620A (en) * 2016-08-22 2016-11-02 四川华索自动化信息工程有限公司 A kind of signal based on technology of Internet of things multistage scale-up version flue temperature monitoring system
CN113755661A (en) * 2020-06-01 2021-12-07 中冶长天国际工程有限责任公司 Blast furnace hot blast stove flue gas air intake system for coke drying and control method
CN113755659A (en) * 2020-06-01 2021-12-07 中冶长天国际工程有限责任公司 Blast furnace hot blast stove flue gas air intake system and control method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6151795A (en) * 1997-06-13 2000-11-28 Mmats Incorporated Flat material dryer
JP2004353975A (en) * 2003-05-29 2004-12-16 Tsukishima Kikai Co Ltd Drying installation and its operating method
CN202512060U (en) * 2012-02-15 2012-10-31 深圳市赛宝伦计算机技术有限公司 Nox analyzer
CN103122398A (en) * 2013-03-13 2013-05-29 中冶赛迪工程技术股份有限公司 Smoke self-circulation preheating coal dust injection technology and device
CN203007295U (en) * 2013-01-11 2013-06-19 莱芜钢铁集团有限公司 Novel blast-furnace hot blast stove exhaust gas classification recycle device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6151795A (en) * 1997-06-13 2000-11-28 Mmats Incorporated Flat material dryer
JP2004353975A (en) * 2003-05-29 2004-12-16 Tsukishima Kikai Co Ltd Drying installation and its operating method
CN202512060U (en) * 2012-02-15 2012-10-31 深圳市赛宝伦计算机技术有限公司 Nox analyzer
CN203007295U (en) * 2013-01-11 2013-06-19 莱芜钢铁集团有限公司 Novel blast-furnace hot blast stove exhaust gas classification recycle device
CN103122398A (en) * 2013-03-13 2013-05-29 中冶赛迪工程技术股份有限公司 Smoke self-circulation preheating coal dust injection technology and device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104482751A (en) * 2014-12-11 2015-04-01 华南农业大学 Method and device for eliminating thermal inertia of hot air drier
CN104482751B (en) * 2014-12-11 2017-02-22 华南农业大学 Method and device for eliminating thermal inertia of hot air drier
CN106066620A (en) * 2016-08-22 2016-11-02 四川华索自动化信息工程有限公司 A kind of signal based on technology of Internet of things multistage scale-up version flue temperature monitoring system
CN113755661A (en) * 2020-06-01 2021-12-07 中冶长天国际工程有限责任公司 Blast furnace hot blast stove flue gas air intake system for coke drying and control method
CN113755659A (en) * 2020-06-01 2021-12-07 中冶长天国际工程有限责任公司 Blast furnace hot blast stove flue gas air intake system and control method

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