CN106867549B - Method for realizing maintenance of dry quenching boiler without stopping production - Google Patents
Method for realizing maintenance of dry quenching boiler without stopping production Download PDFInfo
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- CN106867549B CN106867549B CN201710102594.0A CN201710102594A CN106867549B CN 106867549 B CN106867549 B CN 106867549B CN 201710102594 A CN201710102594 A CN 201710102594A CN 106867549 B CN106867549 B CN 106867549B
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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
- C10B39/00—Cooling or quenching coke
- C10B39/02—Dry cooling outside the oven
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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
- C10B45/00—Other details
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Abstract
The invention relates to a method for realizing maintenance of a coke dry quenching boiler without stopping production, wherein a first gate plate is arranged at an inert gas inlet of the coke dry quenching boiler, and a second gate plate is arranged at an inert gas outlet of the coke dry quenching boiler; along the circulation flow direction of the inert gas, the inert circulation gas pipelines in front of and behind the coke dry quenching boiler are additionally connected through a bypass pipeline, a heat exchange device is arranged on the bypass pipeline, and a third flashboard and a fourth flashboard are respectively arranged at the front end and the rear end of the bypass pipeline; when the dry quenching process system is in normal production, the third flashboard and the fourth flashboard are closed, and the heat exchange device does not participate in the dry quenching production; when the coke dry quenching boiler needs to be overhauled, the coke dry quenching boiler normally operates; closing the first flashboard and the second flashboard, isolating the coke dry quenching boiler from the coke dry quenching process system, and maintaining the coke dry quenching boiler after the hearth of the coke dry quenching boiler is cooled; the invention realizes no production stop of the coke dry quenching process system during the overhaul period of the coke dry quenching boiler, is convenient to implement and can ensure the operation stability of the coke dry quenching process system during the overhaul period of the coke dry quenching boiler.
Description
Technical Field
The invention relates to the technical field of coking, in particular to a method for realizing maintenance of a coke dry quenching boiler without stopping production.
Background
The coke dry quenching is an important technology and process for saving energy and reducing emission in the steel industry, and is a method for quenching coke by gas-solid phase heat exchange between inert gas and red coke in a coke dry quenching furnace.
The coke dry quenching boiler is an important component in the whole coke dry quenching process system, and has the functions of reducing the temperature of the inert circulating gas of the coke dry quenching system and generating steam for supplying heat or generating electricity so as to achieve the aim of effectively utilizing the heat of the inert circulating gas. Whether the coke dry quenching boiler operates well or not directly influences the operation of the coke dry quenching process system.
At present, a dry quenching boiler has two design forms: one is a medium-temperature medium-pressure boiler, and the other is a high-temperature high-pressure boiler. The volumes of the two boilers are both larger than 30L, and the effluent pressure is both larger than 0.1MPa, so the dry quenching boilers are required to be regularly checked according to the regulations of safety supervision of special equipment and the regulations of safety technology supervision of boilers issued by the state. The same regulation is imposed in both standards, i.e. boiler external inspection, performed once a year; the internal inspection of the boiler is carried out every 2 years. All domestic dry quenching boilers must perform according to this standard.
During the boiler internal inspection period of once every 2 years, a professional is required to enter the boiler for inspection, and the production must be stopped for maintenance; namely, red coke can not be loaded in the coke dry quenching boiler, and the temperature must be reduced to ensure that the temperature in the hearth of the coke dry quenching boiler reaches the temperature which can be entered by personnel. The process of cooling the coke dry quenching boiler, checking the interior of the boiler and re-heating the coke dry quenching system after the checking is finished needs about 15 days even if the boiler has no problems. In addition, during the normal operation of the dry quenching process system, the hot circulating gas carries coke powder to cause the occurrence of tube explosion phenomenon of the dry quenching boiler, at the moment, the dry quenching boiler can not be continuously filled with red coke, and the dry quenching boiler must be shut down and cooled to ensure that the temperature of the dry quenching boiler is reduced to the temperature at which personnel can enter for maintenance. The tube explosion overhaul time of the boiler is generally about 7 to 10 days.
During the internal inspection of the boiler and the pipe explosion maintenance of the boiler, the dry quenching furnace can not be filled with red coke, the coke produced by the coke oven can only be processed by a wet quenching system, and the wet quenching system has the following defects:
1) The wet quenching has great environmental pollution, and a great deal of dust is discharged to the atmosphere in the wet quenching process, so the method is a laggard quenching technology;
2) The coke dry quenching body is of a refractory brick masonry structure, the temperature changes violently in the process of cooling and heating the coke dry quenching body, the violent temperature changes can cause cracks to be generated on the refractory material of the masonry, and the service life of the refractory material of the coke dry quenching body is directly influenced by the violent temperature changes;
3) During normal operation of the dry quenching, steam generated by the dry quenching boiler can generate electricity or heat, and during boiler inspection and boiler tube explosion maintenance, the heat of red coke is not utilized and wasted.
Disclosure of Invention
The invention provides a method for realizing maintenance of a coke dry quenching boiler without production stop, which realizes the coke dry quenching process system without production stop during the maintenance of the coke dry quenching boiler, is convenient to implement and can ensure the operation stability of the coke dry quenching process system during the maintenance of the coke dry quenching boiler.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for realizing maintenance of a dry quenching boiler without production stop is characterized in that the dry quenching boiler is arranged in a dry quenching process system, and the dry quenching process system consists of a dry quenching furnace, a primary dust remover, the dry quenching boiler, a secondary dust remover, a circulating fan and a feed water preheater which are sequentially connected through an inert circulating gas pipeline to form a closed loop system; the method specifically comprises the following steps:
1) A first gate plate is arranged at an inert gas inlet of the dry quenching boiler, and a second gate plate is arranged at an inert gas outlet of the dry quenching boiler; in the circulating flow direction of the inert gas, the inert circulating gas pipelines in front of and behind the dry coke quenching boiler are additionally connected through a bypass pipeline, a heat exchange device is arranged on the bypass pipeline, and a third flashboard and a fourth flashboard are respectively arranged at the front end and the rear end of the bypass pipeline;
2) When the dry quenching process system is in normal production, the third flashboard and the fourth flashboard are closed, and the heat exchange device does not participate in the dry quenching production; keeping the first gate plate and the second gate plate in an open state, charging red coke into the dry quenching furnace through the furnace top charging device, exchanging heat with inert gas flowing from bottom to top, and discharging the cooled coke from the bottom of the dry quenching furnace to a coke conveying belt for outward conveying; the inert gas after heat exchange with the red coke is recycled through an inert circulating gas pipeline, firstly enters a primary dust remover for dust removal, then enters a dry quenching boiler for heat exchange with a boiler heat exchange pipe for cooling, passes through a secondary dust remover, and is sent into a feed water preheater by a circulating fan for secondary cooling, and the inert gas after secondary cooling enters a dry quenching furnace again for heat exchange with the red coke;
3) When the coke dry quenching boiler needs to be overhauled, the coke dry quenching boiler normally operates; closing the first flashboard and the second flashboard, isolating the coke dry quenching boiler from the coke dry quenching process system, and maintaining the coke dry quenching boiler after the hearth of the coke dry quenching boiler is cooled; and simultaneously opening the third flashboard and the fourth flashboard, allowing the inert gas subjected to primary dust removal after heat exchange with the red coke to enter a heat exchange device through a bypass pipeline for heat exchange and cooling, then allowing the inert gas to pass through a secondary dust remover and then to be sent into a feed water preheater by a circulating fan for secondary cooling, and allowing the inert gas subjected to secondary cooling to enter the dry quenching furnace again for heat exchange with the red coke.
The heat exchange device can cool the inert gas from 900 +/-50 ℃ to 180 +/-20 ℃.
The heat exchange device is a heat exchanger.
Before each flashboard is opened and closed, the rotating speed of the circulating fan is reduced, and after all the flashboards are opened and closed in place, the original rotating speed is recovered.
Compared with the prior art, the invention has the beneficial effects that:
1) The two ends of the coke dry quenching boiler are provided with the flashboards and the bypass pipeline, the two ends of the bypass pipeline are also provided with the flashboards, and the flashboards are matched to open and close, so that the coke dry quenching boiler can be isolated from a coke dry quenching process system which normally runs for maintenance, and the influence of the maintenance and production halt of the coke dry quenching boiler on coke dry quenching production is eliminated;
2) During the maintenance of the coke dry quenching boiler, all the inert gases after heat exchange in the coke dry quenching boiler are led into a heat exchange device for heat exchange, so that the heat exchange effect is ensured to meet the requirement of coke dry quenching production;
3) The method can be realized by only adding one heat exchange device, one by-pass pipeline and 4 flashboards in the original dry quenching process system, has simple structure and convenient implementation, and is not only suitable for adding a dry quenching process system but also suitable for reconstructing the existing dry quenching process system;
4) During the maintenance period of the coke dry quenching boiler, the production process of the coke dry quenching process system can not generate large temperature change, thereby ensuring the stable operation of the coke dry quenching process system and prolonging the service life of refractory materials.
Drawings
FIG. 1 is a schematic diagram of a method for realizing maintenance of a dry quenching boiler without production stop according to the invention.
In the figure: 1. dry quenching furnace 2, primary dust remover 3, dry quenching boiler 4, secondary dust remover 5, circulating fan 6, feed water preheater 7, heat exchange device 8, third gate 9, fourth gate 10, bypass pipeline 11, first gate 12 and second gate
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
as shown in figure 1, the method for realizing maintenance of the coke dry quenching boiler without production stop comprises the steps that the coke dry quenching boiler 3 is arranged in a coke dry quenching process system, and the coke dry quenching process system consists of a coke dry quenching furnace 1, a primary dust remover 2, the coke dry quenching boiler 3, a secondary dust remover 4, a circulating fan 5 and a feed water preheater 6 which are sequentially connected through an inert circulating gas pipeline to form a closed loop system; the method specifically comprises the following steps:
1) A first flashboard 11 is arranged at an inert gas inlet of the dry quenching boiler 3, and a second flashboard 12 is arranged at an inert gas outlet of the dry quenching boiler; in the circulating flow direction of the inert gas, the front and rear inert circulating gas pipelines of the dry quenching boiler 3 are additionally connected through a bypass pipeline 10, a heat exchange device 7 is arranged on the bypass pipeline 10, and the front and rear ends of the bypass pipeline 10 are respectively provided with a third flashboard 8 and a fourth flashboard 9;
2) When the dry quenching process system is in normal production, the third flashboard 8 and the fourth flashboard 9 are closed, and the heat exchange device 7 does not participate in the dry quenching production; keeping the first gate plate 11 and the second gate plate 12 in an open state, charging red coke into the dry quenching furnace 1 through a furnace top charging device, exchanging heat with inert gas flowing from bottom to top, and discharging the cooled coke from the bottom of the dry quenching furnace 1 to a coke conveying belt for outward conveying; the inert gas after heat exchange with the red coke is recycled through an inert circulating gas pipeline, enters a primary dust remover 2 for dust removal at first, then enters a dry quenching boiler 3 for heat exchange and temperature reduction with a boiler heat exchange pipe, passes through a secondary dust remover 4, and is sent into a feed water preheater 6 by a circulating fan 5 for secondary temperature reduction, and the inert gas after secondary temperature reduction enters a dry quenching furnace 1 again for heat exchange with the red coke;
3) When the dry quenching boiler 3 needs to be overhauled, the dry quenching boiler 1 normally operates; closing the first flashboard 11 and the second flashboard 12, isolating the coke dry quenching boiler 3 from a coke dry quenching process system, and maintaining the hearth of the coke dry quenching boiler 3 after cooling; and simultaneously opening the third flashboard 8 and the fourth flashboard 9, allowing the inert gas subjected to primary dust removal after heat exchange with the red coke to enter a heat exchange device 7 through a bypass pipeline 10 for heat exchange and temperature reduction, then allowing the inert gas to pass through a secondary dust remover 4 and then to be sent into a water supply preheater 6 by a circulating fan 5 for secondary temperature reduction, and allowing the inert gas subjected to secondary temperature reduction to enter the dry quenching furnace 1 again for heat exchange with the red coke.
The heat exchange device 7 can cool the inert gas from 900 +/-50 ℃ to 180 +/-20 ℃.
The heat exchange device 7 is a heat exchanger.
Before the flashboards 8, 9, 11 and 12 are opened and closed, the rotating speed of the circulating fan 5 is reduced, and the original rotating speed is recovered after all the flashboards 8, 9, 11 and 12 are opened and closed in place.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (3)
1. A method for realizing maintenance of a dry quenching boiler without production stop is characterized in that the dry quenching boiler is arranged in a dry quenching process system, and the dry quenching process system consists of a dry quenching furnace, a primary dust remover, the dry quenching boiler, a secondary dust remover, a circulating fan and a feed water preheater which are sequentially connected through an inert circulating gas pipeline to form a closed loop system; the method is characterized by comprising the following steps:
1) A first gate plate is arranged at an inert circulating gas inlet of the dry quenching boiler, and a second gate plate is arranged at an inert circulating gas outlet of the dry quenching boiler; in the circulating flow direction of the inert gas, the inert circulating gas pipelines in front of and behind the dry coke quenching boiler are additionally connected through a bypass pipeline, a heat exchange device is arranged on the bypass pipeline, and a third flashboard and a fourth flashboard are respectively arranged at the front end and the rear end of the bypass pipeline; the heat exchange device can reduce the temperature of the inert gas from 900 +/-50 ℃ to 180 +/-20 ℃;
2) When the dry quenching process system is in normal production, the third flashboard and the fourth flashboard are closed, and the heat exchange device does not participate in the dry quenching production; keeping the first gate plate and the second gate plate in an open state, charging red coke into the dry quenching furnace through a furnace top charging device, exchanging heat with inert gas flowing from bottom to top, and discharging cooled coke from the bottom of the dry quenching furnace to a coke conveying belt for outward conveying; the inert gas after heat exchange with the red coke is recycled through an inert circulating gas pipeline, firstly enters a primary dust remover for dust removal, then enters a dry quenching boiler for heat exchange with a boiler heat exchange pipe for cooling, passes through a secondary dust remover, and is sent into a feed water preheater by a circulating fan for secondary cooling, and the inert gas after secondary cooling enters a dry quenching furnace again for heat exchange with the red coke;
3) When the coke dry quenching boiler needs to be overhauled, the coke dry quenching boiler normally operates; closing the first flashboard and the second flashboard, isolating the coke dry quenching boiler from the coke dry quenching process system, and maintaining the coke dry quenching boiler after the hearth of the coke dry quenching boiler is cooled; and simultaneously opening the third flashboard and the fourth flashboard, allowing the inert gas subjected to primary dust removal after heat exchange with the red coke to enter a heat exchange device through a bypass pipeline for heat exchange and cooling, then allowing the inert gas to pass through a secondary dust remover and then to be sent into a water supply preheater by a circulating fan for secondary cooling, and allowing the inert gas subjected to secondary cooling to enter the dry quenching furnace again for heat exchange with the red coke.
2. The method for realizing overhaul of the dry quenching boiler without production stop according to claim 1, wherein the heat exchange device is a heat exchanger.
3. The method for realizing the overhaul of the dry quenching boiler without stopping production according to claim 1, wherein before each flashboard is opened and closed, the rotating speed of the circulating fan is reduced, and after all the flashboards are opened and closed in place, the original rotating speed is recovered.
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| CN201710102594.0A CN106867549B (en) | 2017-02-24 | 2017-02-24 | Method for realizing maintenance of dry quenching boiler without stopping production |
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| CN106867549B true CN106867549B (en) | 2022-10-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108624339B (en) * | 2018-05-11 | 2020-09-29 | 鞍钢股份有限公司 | Winter dry quenching furnace annual repair heat preservation method |
| CN109575957A (en) * | 2018-11-19 | 2019-04-05 | 包头钢铁（集团）有限责任公司 | A kind of method of dry coke quenching auxiliary hot repair heat preservation decompression |
| CN112780364B (en) * | 2021-01-19 | 2022-11-25 | 山西太钢不锈钢股份有限公司 | Method for prolonging running time of dry quenching steam turbine generator |
| CN113930250A (en) * | 2021-10-15 | 2022-01-14 | 包头钢铁（集团）有限责任公司 | Method for preventing damage of superheater of dry quenching boiler |
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2017
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Patent Citations (6)
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| CA2806649A1 (en) * | 2009-07-31 | 2011-02-03 | Curtiss-Wright Flow Control Corporation | Seat and valve systems for use in delayed coker system |
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| CN203741268U (en) * | 2014-03-07 | 2014-07-30 | 北京华泰焦化工程技术有限公司 | Dry quenching equipment |
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