CN112780364B - Method for prolonging running time of dry quenching steam turbine generator - Google Patents
Method for prolonging running time of dry quenching steam turbine generator Download PDFInfo
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- CN112780364B CN112780364B CN202110069763.1A CN202110069763A CN112780364B CN 112780364 B CN112780364 B CN 112780364B CN 202110069763 A CN202110069763 A CN 202110069763A CN 112780364 B CN112780364 B CN 112780364B
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- Prior art keywords
- dry quenching
- coke
- quenching furnace
- turbine generator
- steam turbine
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Classifications
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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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/006—Systems for reclaiming waste heat using a boiler
-
- 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
-
- 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 method for prolonging the running time of a coke dry quenching steam turbine generator, which belongs to the technical field of coke dry quenching waste heat recovery, and under the condition that a coke dry quenching furnace stops charging coke, the running time of the steam turbine generator is prolonged, the steam recovery is improved, and the economic benefit of the coke dry quenching is improved, wherein the solution scheme is as follows: through the minimum running condition of the evaporation capacity of the steam turbine generator, the temperature of the coke in the cooling section and the material level of the dry quenching furnace are improved in advance, the temperature which is improved in advance by the cooling section is firstly utilized to ensure the running of the steam turbine generator after coke charging is stopped, the running time of the steam turbine generator after the dry quenching furnace stops charging is prolonged, and steam recovery is improved.
Description
Technical Field
The invention belongs to the technical field of dry quenching waste heat recovery, and particularly relates to a method for prolonging the running time of a dry quenching steam turbine generator.
Background
The dry quenching is a quenching process using the direct contact heat exchange of incandescent coke and inert gas.
In the prior art, a coke tank filled with red coke is carried to the bottom of a lifting derrick by a belt-driven carrier loader, a lifter lifts the coke tank and conveys the coke tank to the top of a coke dry quenching furnace, and coke is loaded into the coke dry quenching furnace by a loading device with a distributor. The coke is directly subjected to heat exchange with inert gas in a dry quenching furnace, cooled to below 200 ℃ on average, discharged onto a belt conveyor through a coke discharging device and then sent to a coke treatment system.
And blowing the inert gas for cooling the coke into the dry quenching furnace from a gas supply device at the bottom of the dry quenching furnace by using a circulating fan, and performing countercurrent heat exchange with the red hot coke. The hot circulating gas exhausted from the annular air flue of the self-dry quenching furnace is dedusted by a primary deduster, and air is sucked to combust combustible components and part of coke powder in the circulating gas, and then the hot circulating gas enters a dry quenching boiler for heat exchange, and the temperature is reduced to about 170 ℃. The cold circulating gas from the boiler is dedusted by a secondary deduster, pressurized by a circulating fan, cooled to about 130 ℃ by a heat pipe exchanger, and then enters a dry quenching furnace for recycling. And sending the steam generated by the boiler to a turbine generator to generate power.
When the red coke is loaded into the system or the coke oven is overhauled in the production process, because no red coke is loaded into the dry quenching furnace, the temperature and the pressure of steam generated by the boiler are reduced, the steam of the turbonator is stopped, and the steam is diffused, and after the turbonator is stopped, the programs of pipe warming, flushing, transferring and the like are needed when the turbonator is started, so that a large amount of steam is diffused.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, prolong the running time of a turbonator, improve the steam recovery and improve the economic benefit of dry quenching under the condition that a dry quenching furnace stops coke charging, and provides a method for prolonging the running time of the dry quenching turbonator.
The design concept of the invention is as follows: analyzing the lowest operation condition of the turbonator, controlling the temperature and pressure of the main steam normally, controlling the operation power of the turbonator to 8000w/h, and controlling the steam flow to be 60-70 m 3 The evaporation capacity of each of the two dry quenching coke is controlled to be 30-35 m 3 The stable operation of the turbonator can be ensured.
The temperature of the coke in the cooling section is increased in advance, the material level of the dry quenching furnace is increased, the temperature increased in advance in the cooling section is utilized to ensure the running of the turbonator after the coke charging is stopped, and the running time of the turbonator after the dry quenching furnace stops charging is prolonged.
In a word, the invention firstly improves the temperature and the material level of the coke in the cooling section, reduces the circulating air volume to the lowest circulating air volume after stopping coke charging, stops coke discharging and ensures stable evaporation capacity by utilizing the temperature of the coke in the cooling section, and starts coke discharging to maintain the stable operation of the evaporation capacity when the evaporation capacity begins to be reduced.
The invention is realized by the following technical scheme:
a method for prolonging the running time of a dry quenching steam turbine generator comprises the following steps:
s1, controlling the material level of a dry quenching furnace to ensure that the total height of dry quenched coke in the dry quenching furnace is 14 meters after the dry quenched coke is initially loaded;
s2, starting to operate a dry quenching furnace 3 hours before the dry quenching steam turbine generator operates, adjusting the circulating air volume to 60-65%, maintaining the coke discharge quantity to be 120 +/-5 t/h constant, controlling the temperature of a boiler inlet to be 960 +/-10 ℃, and simultaneously determining the coke discharge temperature to be below 180 ℃;
s3, adjusting the circulating air quantity of the dry quenching furnace to 50-55% 1 hour before the dry quenching steam turbine generator runs, reducing the coke discharge quantity to 100 +/-5 t/h, gradually increasing the material level of the dry quenching furnace to 15 +/-0.2 m, controlling the inlet temperature of the boiler to 960 +/-10 ℃, and simultaneously determining the coke discharge temperature to be below 180 ℃;
s4, adjusting the circulating air quantity of the dry quenching furnace to 45-50% 0.5 hour before the dry quenching steam turbine generator operates, reducing the coke discharge quantity to 80 +/-5 t/h, gradually increasing the material level of the dry quenching furnace until the material level of the dry quenching furnace is controlled to 16 m before coke charging is stopped, controlling the inlet temperature of the boiler to be 980 ℃, and simultaneously determining the coke discharge temperature to be below 180 ℃;
s5, after coke charging is stopped, immediately stopping coke discharging of the dry quenching furnace, adjusting the rotating speed of a circulating fan to 42 +/-2%, and maintaining the stable operation of the circulating fan;
s6, controlling the pressure of the pre-storage chamber to be 0-20Pa, reducing the introduction amount of cold air in the system to be 5000 +/-300 m & lt 3 & gt/h, and controlling the reduction speed of the inlet temperature of the boiler to be 75 +/-5 ℃/h;
s7, when the temperature of the boiler inlet is reduced to 800 ℃, the dry quenching furnaces are started to discharge coke, and the coke discharge amount of each dry quenching furnace is controlled to be 30-35t/h;
and S8, after the coke charging is resumed, repeating the steps S1 to S7, firstly charging each dry quenching furnace into one furnace, and then adjusting the circulating air volume and the coke discharge volume according to the charging rhythm.
Further, the evaporation capacity of each boiler is maintained to be 30 +/-5 t/h in the steps S1-S7, and the power generation capacity of the dry quenching steam turbine generator is 8000-10000 kwh/h.
Compared with the prior art, the invention has the beneficial effects that:
after the implementation of the invention, the time for maintaining the operation of the turbonator after the coke charging of the dry quenching furnace is stopped is prolonged, and the steam emission is reduced, which is mainly embodied in that the cycle time of the coke furnace and the dry quenching furnace can be utilized to arrange the maintenance of the red coke charging system within 5 hours, and the maintenance work is completed under the condition of normal steam recovery, the times of dry quenching coke regular inspection (12-hour maintenance) are reduced to 2 times per year from 6-8 times per year, the steam emission times are shortened, and the steam recovery amount is improved.
After the method is implemented, the yield of dry quenching coke per ton coke steam is gradually improved from 0.594t to 0.61t, and the economic benefit is generated every year according to the calculation of the annual coke yield of 300 ten thousand tons: (0.61-0.594) × 300 × 3.46 × 10=166 ten thousand yuan (3.46 is steam conversion factor, 10 is the settlement price of 1GJ steam of the company).
Detailed Description
The present invention will be described in further detail with reference to examples.
A method for prolonging the running time of a dry quenching steam turbine generator comprises the following steps:
s1, controlling the material level of a dry quenching furnace to ensure that the total height of dry quenching in the dry quenching furnace is 14 meters after the dry quenching is initially loaded;
s2, starting to operate a dry quenching furnace 3 hours before a dry quenching steam turbine generator operates, adjusting the circulating air volume to 60-65%, maintaining the coke discharge constant, controlling the inlet temperature of a boiler to be 960 ℃, and simultaneously determining the coke discharge temperature to be below 180 ℃, wherein the step S2 is mainly used for improving the coke temperature of a cooling section;
s3, adjusting the circulating air quantity of the dry quenching furnace to 50-55% 1 hour before the dry quenching steam turbine generator operates, reducing the coke discharge quantity to 100t/h, gradually increasing the material level of the dry quenching furnace to 15 m, controlling the inlet temperature of the boiler to be 960 +/-10 ℃, and simultaneously determining the coke discharge temperature to be below 180 ℃;
s4, adjusting the circulating air quantity of the dry quenching furnace to 45-50% 0.5 hour before the dry quenching steam turbine generator operates, reducing the coke discharge quantity to 80t/h, gradually increasing the material level of the dry quenching furnace until the material level of the dry quenching furnace is controlled to 16 m before coke charging is stopped, controlling the inlet temperature of the boiler to be 980 ℃, and simultaneously determining the coke discharge temperature to be below 180 ℃;
s5, after coke charging is stopped, the dry quenching furnace immediately stops coke discharging, the rotating speed of a circulating fan is adjusted to 42 +/-2%, and the stable operation of the circulating fan is maintained, wherein in the step S5, the steam is maintained to be stable by utilizing the temperature which is increased in advance in a cooling section;
s6, controlling the pressure of the pre-storage chamber to be 0-20Pa, and reducing the introduction amount of cold air in the system to 5000m 3 Controlling the reduction speed of the temperature at the inlet of the boiler to be 75 ℃/h;
s7, when the temperature of the boiler inlet is reduced to 800 ℃, starting coke discharging of the dry quenching furnaces, and controlling the coke discharging amount of each dry quenching furnace to be 30t/h;
and S8, after the coke charging is resumed, repeating the steps S1 to S7, firstly charging each dry quenching furnace into one furnace, and then adjusting the circulating air volume and the coke discharge volume according to the charging rhythm.
Further, the evaporation capacity of each boiler is maintained to be 30 +/-5 t/h in the steps S1-S7, and the power generation capacity of the dry quenching steam turbine generator is 8000 to 10000kwh/h.
The steps S1 to S8 are implemented in the overhaul process of a coke dry quenching hoister, an APS and a loading device in the south area of a coke plant of the company, the overhaul of a red coke loading system can be controlled within 5~6 hours by utilizing the cycle time of a 9# coke oven, the stable operation of a turbonator is ensured, the daily monthly inspection stop time is basically eliminated, and the steam recovery is improved.
According to the invention, by analyzing the lowest operation condition of the evaporation capacity of the turbonator, the temperature of the coke in the cooling section and the material level of the dry quenching furnace are increased in advance, when coke charging is stopped, the temperature increased in advance in the cooling section is firstly utilized to ensure the operation of the turbonator, the operation time of the turbonator after coke charging of the dry quenching furnace is stopped is prolonged, and the steam recovery is improved.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (1)
1. A method for prolonging the running time of a dry quenching steam turbine generator is characterized by comprising the following steps:
s1, controlling the material level of a dry quenching furnace to ensure that the total height of dry quenching in the dry quenching furnace is 14 meters after the dry quenching is initially loaded;
s2, starting to operate a dry quenching furnace 3 hours before the dry quenching steam turbine generator operates, adjusting the circulating air volume to 60-65%, maintaining the coke discharge constant, controlling the inlet temperature of a boiler to be 960 +/-10 ℃, and simultaneously determining the coke discharge temperature to be below 180 ℃;
s3, adjusting the circulating air quantity of the dry quenching furnace to 50-55% 1 hour before the dry quenching steam turbine generator runs, reducing the coke discharge quantity to 100 +/-5 t/h, gradually increasing the material level of the dry quenching furnace to 15 +/-0.2 m, controlling the inlet temperature of the boiler to 960 +/-10 ℃, and simultaneously determining the coke discharge temperature to be below 180 ℃;
s4, adjusting the circulating air quantity of the dry quenching furnace to 45-50% 0.5 hour before the dry quenching steam turbine generator operates, reducing the coke discharge quantity to 80 +/-5 t/h, gradually increasing the material level of the dry quenching furnace until the material level of the dry quenching furnace is controlled to 16 m before coke charging is stopped, controlling the inlet temperature of the boiler to be 980 ℃, and simultaneously determining the coke discharge temperature to be below 180 ℃;
s5, after coke charging is stopped, the coke discharging of the dry quenching furnace is immediately stopped, the rotating speed of a circulating fan is adjusted to 42 +/-2%, and the stable operation of the circulating fan is maintained;
s6, controlling the pressure of the pre-storage chamber to be 0-20Pa, and reducing the introduction amount of cold air in the system to be 5000 +/-300 m 3 H, controlling the reduction speed of the temperature of the boiler inlet to be 75 +/-5 ℃/h;
s7, when the temperature of the boiler inlet is reduced to 800 ℃, the dry quenching furnaces are started to discharge coke, and the coke discharge amount of each dry quenching furnace is controlled to be 30-35t/h; S1-S7, maintaining the evaporation capacity of each boiler at 30 +/-5 t/h, and controlling the generated energy of the dry quenching turbogenerator to be 8000-10000kwh/h;
and S8, after the coke charging is resumed, repeating the steps S1 to S7, firstly charging each dry quenching furnace into one furnace, and then adjusting the circulating air volume and the coke discharge volume according to the charging rhythm.
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| CN202110069763.1A CN112780364B (en) | 2021-01-19 | 2021-01-19 | Method for prolonging running time of dry quenching steam turbine generator |
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| CN202110069763.1A CN112780364B (en) | 2021-01-19 | 2021-01-19 | Method for prolonging running time of dry quenching steam turbine generator |
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| CN113322086B (en) * | 2021-06-29 | 2022-05-03 | 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 |
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