CN111139090A - Ultralow-load operation method of dry quenching system - Google Patents
Ultralow-load operation method of dry quenching system Download PDFInfo
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- CN111139090A CN111139090A CN201911379244.4A CN201911379244A CN111139090A CN 111139090 A CN111139090 A CN 111139090A CN 201911379244 A CN201911379244 A CN 201911379244A CN 111139090 A CN111139090 A CN 111139090A
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- steam
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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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
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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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
- F01K13/00—General layout or general methods of operation of complete plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G1/00—Steam superheating characterised by heating method
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
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- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Coke Industry (AREA)
Abstract
The invention relates to an ultra-low load operation method of a dry quenching system, for the dry quenching system provided with more than 2 sets of dry quenching devices, high-pressure superheated steam produced by an A group dry quenching boiler enters a steam supplementing type turbine from the head part; the B group of dry quenching boilers operates at a low load which is 60 percent lower than the full load, produces low-pressure superheated steam and enters a steam supplementing type steam turbine from an intermediate stage; for a coke dry quenching system provided with 1 set of coke dry quenching device and an external steam supply inlet, external high-pressure superheated steam meeting the steam inlet requirement of a steam supplementing turbine enters the steam supplementing turbine from the head part; the dry quenching boiler operates at a low load which is 60 percent lower than the full load, and the produced low-pressure superheated steam enters a steam supplementing type steam turbine from an intermediate stage matched with the pressure of the low-pressure superheated steam; the superheated steam in the steam supplementing type turbine is used for doing work and generating power, and then enters the condenser to be cooled into condensed water. The invention can ensure that the dry quenching system can continuously and stably run under the ultra-low load.
Description
Technical Field
The invention relates to the technical field of dry quenching waste heat power generation, in particular to an ultra-low load operation method of a dry quenching system.
Background
The dry quenching system has been widely applied as a technique for improving coke quality, recovering waste heat and reducing pollution in the coking field. The dry quenching system mainly comprises a coke tank, a lifting device, a dry quenching furnace, a dry quenching boiler and a circulating fan. And loading red coke pushed out of the coke oven carbonization chamber into a coke tank on a coke tank trolley, moving the coke tank trolley to the bottom of a dry quenching lifting derrick, then placing the coke tank on the top of the dry quenching furnace by a lifting device, and then loading the red coke in the coke tank into the dry quenching furnace by the coke tank. In the dry quenching furnace, cold circulating gas mainly containing nitrogen exchanges heat with red coke to absorb heat and then becomes hot circulating gas, then exchanges heat with steam and water in the dry quenching furnace to release heat and become cold circulating gas, then exchanges heat with demineralized water in a heat pipe exchanger to further cool, and finally enters the dry quenching furnace again.
The steam-water heat exchange with the hot circulating gas in the coke dry quenching boiler absorbs heat and turns into superheated steam. Superheated steam is typically piped to the turbine and enters from the turbine head. The steam in the turbine is partially extracted from the middle to supply heat to the outside, and is partially cooled into condensed water in a condenser at the downstream of the turbine. The condensed water and the supplied make-up water are treated and then sent to a dry quenching boiler to exchange heat with the hot circulating gas.
The coke oven can greatly prolong the coking time in the start-up stage; due to market demand, coking times can also be greatly extended in certain periods of time in order to reduce coke production. At this time, the frequency of charging the incandescent coke into the dry quenching furnace is greatly reduced, so that the flow rate of the hot circulating gas absorbing coke heat in the dry quenching furnace is reduced, the temperature is reduced, and the heat absorbed by the hot circulating gas by the dry quenching boiler is reduced. When the load of the dry quenching boiler is 60 percent or more of the full load, the evaporation capacity of the dry quenching boiler is reduced, so that the steam meeting the steam inlet requirement (pressure and temperature) of a steam turbine can be produced; when the dry quenching boiler is in an ultra-low load working condition with the full load below 60 percent, the steam meeting the steam inlet requirement of the steam turbine can not be ensured to be produced even if the evaporation capacity of the dry quenching boiler is reduced. And the steam which does not meet the steam inlet requirement of the steam turbine cannot enter the steam turbine, at the moment, part of the steam is supplied outside after being subjected to temperature reduction and pressure reduction, and the rest of the steam can only be diffused and treated. The steam emission not only wastes the demineralized water which is expensive to produce, but also wastes the heat of the hot circulating gas which is absorbed in the dry coke-quenching boiler, so that it should be avoided as much as possible.
Disclosure of Invention
The invention provides an ultralow-load operation method of a coke dry quenching system, which is suitable for the coke dry quenching system which is provided with more than 2 sets of coke dry quenching devices or a single set of coke dry quenching devices and is provided with an external steam supply inlet, and can ensure that the coke dry quenching system can continuously and stably operate under the ultralow load (less than 60 percent of full load).
In order to achieve the purpose, the invention adopts the following technical scheme:
an ultra-low load operation method of a dry quenching system, wherein the dry quenching system at least comprises a dry quenching device, a steam supplementing type steam turbine and a generator; the dry quenching device at least comprises a dry quenching furnace and a dry quenching boiler; the ultra-low load operation method of the dry quenching system comprises the following steps:
1) for a coke dry quenching system provided with more than 2 sets of coke dry quenching devices, dividing a coke dry quenching boiler into an A group and a B group, wherein the A group of coke dry quenching boilers normally operate to produce high-pressure superheated steam with rated parameters so as to meet the steam admission requirement of a steam supplementing type steam turbine, and the generated high-pressure superheated steam enters the steam supplementing type steam turbine from the head part; the B group of dry quenching boilers operates at a low load which is 60 percent lower than the full load to produce low-pressure superheated steam, and the produced low-pressure superheated steam enters a steam supplementing type steam turbine and enters from an intermediate stage matched with the pressure of the steam supplementing type steam turbine; the 2 kinds of superheated steam all work and generate power in the steam supplementing type steam turbine, then enter a condenser and are cooled into condensed water in the condenser;
2) for a coke dry quenching system provided with 1 set of coke dry quenching device and an external steam supply inlet, external high-pressure superheated steam meeting the steam inlet requirement of a steam supplementing turbine enters the steam supplementing turbine from the head part; the dry quenching boiler operates at a low load which is 60 percent lower than the full load to produce low-pressure superheated steam, and the produced low-pressure superheated steam enters the steam supplementing type steam turbine and enters from an intermediate stage matched with the pressure of the steam supplementing type steam turbine; the 2 kinds of superheated steam all work and generate power in the steam supplementing type turbine, then enter the condenser and are cooled into condensed water in the condenser.
Compared with the prior art, the invention has the beneficial effects that:
1) the coke dry quenching system can continuously and stably operate and fully recover coke heat under the special conditions of startup of the coke oven, production of prolonging coking time in a specific time period, ultralow load working condition of coke dry quenching and the like; although the power generation capacity of the low-pressure steam is poor, the generated electricity quantity is more than the electricity consumption of electric equipment such as a circulating fan, a boiler feed pump and the like during the production of the coke dry quenching system, and certain economic benefit is achieved;
2) when the dry quenching system is started after being stopped, the dry quenching furnace needs to be dried, and a certain amount of steam and coke oven gas are consumed in the process, so that energy waste is caused; the invention can avoid the above situation;
3) the coke dry quenching system is provided with a large amount of metal materials and heat-resistant materials, and the metal materials and the refractory materials are damaged to a certain extent in the temperature rise and temperature drop process in the coke dry quenching starting and shutdown process; the invention can avoid the above situation.
Drawings
FIG. 1 is a first schematic diagram of an ultra-low load operation method of a coke dry quenching system according to the present invention.
FIG. 2 is a second schematic diagram of an ultra low load operation method of a coke dry quenching system according to the present invention.
In the figure: 1, A group of dry quenching furnaces 2, B group of dry quenching furnaces 3, A group of dry quenching boilers 4, B group of dry quenching boilers 5, steam supplementing type turbines 6, condensers 7, hot circulating gas 8, cold circulating gas 9, high-pressure superheated steam 10, low-pressure superheated steam 11, condensed water 12, externally supplied high-pressure superheated steam 13, dry quenching furnaces 14 and dry quenching boilers 5
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
the invention relates to an ultra-low load operation method of a dry quenching system, wherein the dry quenching system at least comprises a dry quenching device, a steam supplementing type steam turbine and a generator; the dry quenching device at least comprises a dry quenching furnace and a dry quenching boiler; the ultra-low load operation method of the dry quenching system comprises the following steps:
1) as shown in fig. 1, for a coke dry quenching system provided with more than 2 sets of coke dry quenching devices, coke dry quenching boilers are divided into a group a and a group B, the coke dry quenching boilers 3 (corresponding to the group a coke dry quenching furnaces 1) of the group a operate normally to produce high-pressure superheated steam 9 with rated parameters so as to meet the steam admission requirement of a steam supplementing turbine 5, and the generated high-pressure superheated steam 9 enters the steam supplementing turbine 5 from the head; the B group of dry quenching boilers 4 (corresponding to the B group of dry quenching boilers 2) operate at a low load of 60 percent lower than the full load to produce low-pressure superheated steam 10, and the produced low-pressure superheated steam 10 enters the steam supplementing type steam turbine 5 and enters from an intermediate stage matched with the pressure of the steam supplementing type steam turbine; 2 kinds of superheated steam 9, 10 all do work and generate electricity in the steam supplementing type turbine 5, then enter the condenser 6 and are cooled into condensed water therein;
2) as shown in fig. 2, for a coke dry quenching system provided with 1 set of coke dry quenching device and an external steam supply inlet, external high-pressure superheated steam 12 meeting the steam inlet requirement of the steam supplementing turbine 5 enters the steam supplementing turbine 5 from the head; a dry quenching boiler 14 (corresponding to a dry quenching furnace 13) operates at a low load of 60 percent lower than the full load to produce low-pressure superheated steam 10, and the produced low-pressure superheated steam 10 enters the steam supplementing type steam turbine 5 and enters from an intermediate stage matched with the pressure of the steam supplementing type steam turbine; the 2 kinds of superheated steam 12, 10 are all used for generating power in the steam supplementing turbine 5, then enter the condenser 6 and are cooled into condensed water in the condenser.
Compared with the conventional dry quenching system, the invention does not need to increase equipment; the production process of the dry quenching device is operated according to the conventional method, in a dry quenching furnace 1, 2 or 13, cold circulating gas 8 mainly containing nitrogen exchanges heat with red coke to absorb heat and then becomes hot circulating gas 7, then exchanges heat with steam water in a dry quenching boiler 3, 4 or 14 to release heat and become cold circulating gas 8, then exchanges heat with desalted water in a heat pipe exchanger to further cool, and then enters the corresponding dry quenching furnace 1, 2 or 13 again. Compared with the prior art, the method changes the operation mode between the dry quenching boiler and the steam turbine, and enables the set dry quenching boiler to be used for producing low-pressure superheated steam, thereby realizing the ultra-low load operation of the dry quenching system.
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 (1)
1. An ultra-low load operation method of a dry quenching system, wherein the dry quenching system at least comprises a dry quenching device, a steam supplementing type steam turbine and a generator; the dry quenching device at least comprises a dry quenching furnace and a dry quenching boiler; the ultra-low load operation method of the dry quenching system is characterized by comprising the following steps:
1) for a coke dry quenching system provided with more than 2 sets of coke dry quenching devices, dividing a coke dry quenching boiler into an A group and a B group, wherein the A group of coke dry quenching boilers normally operate to produce high-pressure superheated steam with rated parameters so as to meet the steam admission requirement of a steam supplementing type steam turbine, and the generated high-pressure superheated steam enters the steam supplementing type steam turbine from the head part; the B group of dry quenching boilers operates at a low load which is 60 percent lower than the full load to produce low-pressure superheated steam, and the produced low-pressure superheated steam enters a steam supplementing type steam turbine and enters from an intermediate stage matched with the pressure of the steam supplementing type steam turbine; the 2 kinds of superheated steam all work and generate power in the steam supplementing type steam turbine, then enter a condenser and are cooled into condensed water in the condenser;
2) for a coke dry quenching system provided with 1 set of coke dry quenching device and an external steam supply inlet, external high-pressure superheated steam meeting the steam inlet requirement of a steam supplementing turbine enters the steam supplementing turbine from the head part; the dry quenching boiler operates at a low load which is 60 percent lower than the full load to produce low-pressure superheated steam, and the produced low-pressure superheated steam enters the steam supplementing type steam turbine and enters from an intermediate stage matched with the pressure of the steam supplementing type steam turbine; the 2 kinds of superheated steam all work and generate power in the steam supplementing type turbine, then enter the condenser and are cooled into condensed water in the condenser.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911379244.4A CN111139090A (en) | 2019-12-27 | 2019-12-27 | Ultralow-load operation method of dry quenching system |
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| CN201911379244.4A CN111139090A (en) | 2019-12-27 | 2019-12-27 | Ultralow-load operation method of dry quenching system |
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| CN111139090A true CN111139090A (en) | 2020-05-12 |
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| CN201911379244.4A Pending CN111139090A (en) | 2019-12-27 | 2019-12-27 | Ultralow-load operation method of dry quenching system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113322086A (en) * | 2021-06-29 | 2021-08-31 | 攀钢集团西昌钢钒有限公司 | Time delay method for controlling quality of externally supplied steam of dry quenching in sections |
| CN114437744A (en) * | 2022-02-09 | 2022-05-06 | 天津铁厂有限公司 | Control method for reducing coal gas consumption in long coking time of coke oven |
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2019
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113322086A (en) * | 2021-06-29 | 2021-08-31 | 攀钢集团西昌钢钒有限公司 | Time delay method for controlling quality of externally supplied steam of dry quenching in sections |
| CN114437744A (en) * | 2022-02-09 | 2022-05-06 | 天津铁厂有限公司 | Control method for reducing coal gas consumption in long coking time of coke oven |
| CN114437744B (en) * | 2022-02-09 | 2023-10-31 | 天津铁厂有限公司 | Control method for reducing gas consumption of coke oven under long coking time |
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Application publication date: 20200512 |