WO2016098385A1 - 酸素燃焼ボイラ設備の脱塵装置入口温度制御方法及び装置 - Google Patents
酸素燃焼ボイラ設備の脱塵装置入口温度制御方法及び装置 Download PDFInfo
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- WO2016098385A1 WO2016098385A1 PCT/JP2015/073107 JP2015073107W WO2016098385A1 WO 2016098385 A1 WO2016098385 A1 WO 2016098385A1 JP 2015073107 W JP2015073107 W JP 2015073107W WO 2016098385 A1 WO2016098385 A1 WO 2016098385A1
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- exhaust gas
- inlet temperature
- combustion gas
- boiler
- preheater
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
- F23L7/007—Supplying oxygen or oxygen-enriched air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C99/00—Subject-matter not provided for in other groups of this subclass
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/04—Arrangements of recuperators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2202/00—Fluegas recirculation
- F23C2202/10—Premixing fluegas with fuel and combustion air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2202/00—Fluegas recirculation
- F23C2202/30—Premixing fluegas with combustion air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2217/00—Intercepting solids
- F23J2217/10—Intercepting solids by filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L2900/00—Special arrangements for supplying or treating air or oxidant for combustion; Injecting inert gas, water or steam into the combustion chamber
- F23L2900/07001—Injecting synthetic air, i.e. a combustion supporting mixture made of pure oxygen and an inert gas, e.g. nitrogen or recycled fumes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2221/00—Pretreatment or prehandling
- F23N2221/08—Preheating the air
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/32—Direct CO2 mitigation
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Definitions
- the present invention relates to a method and an apparatus for controlling the temperature at the inlet of a dedusting device for an oxyfuel boiler facility.
- coal-fired power generation facilities using pulverized coal fired boilers have been playing an important role due to the situation of rising prices accompanying the recent increase in demand for oil and natural gas.
- An air-fired boiler using air as a combustion gas has been generally used for conventional pulverized coal fired boilers.
- Coal combustion itself has the problem of higher CO 2 emissions compared to oil and natural gas combustion, so the increase in CO 2 emissions due to an increase in the dependency ratio on coal thermal power will prevent global warming. From the point of view, this is an important issue that must be avoided.
- the oxyfuel boiler In the oxyfuel boiler, most of the exhaust gas discharged from the oxyfuel boiler that burns pulverized coal is extracted from the middle of the flue, and the oxygen concentration is adjusted by mixing the extracted exhaust gas with oxygen produced by an oxygen production device An exhaust gas recirculation system is adopted in which a working gas is supplied to the oxyfuel boiler. According to the exhaust gas recirculation type oxyfuel boiler, the exhaust gas does not contain nitrogen, and the final exhaust gas CO 2 concentration is dramatically increased, thus facilitating the separation and recovery of CO 2 from the exhaust gas. become.
- patent document 1 shows the general technical level relevant to an oxyfuel boiler, for example.
- the low-temperature side inlet gas temperature of the preheater for preheating the recirculated combustion gas is about 100 ° C. to 150 ° C. unlike air combustion. Therefore, the exhaust gas temperature on the high temperature side inevitably rises from the time of air combustion operation and reaches about 180 ° C. to 230 ° C. In this case, the low-temperature end metal temperature does not fall below the acid dew point (the temperature at which sulfurous acid gas becomes sulfuric acid and forms condensation). That is, it is not necessary to perform temperature control for preventing acid dew point corrosion at the exhaust gas outlet of the preheater.
- the acid dew point the temperature at which sulfurous acid gas becomes sulfuric acid and forms condensation
- the exhaust gas that has passed through the preheater is further cooled by an exhaust gas cooler and reaches about 130 ° C. to 150 ° C. at the inlet of the dust removing apparatus. For this reason, it is necessary to prevent sulfuric acid corrosion at the exhaust gas cooler outlet (that is, the dust removing device inlet), and temperature control at a temperature higher than the acid dew point is necessary, but no specific measures have been taken. Was the current situation.
- the present invention has been made in view of the above-described conventional problems.
- the exhaust gas cooler outlet can be maintained at a temperature equal to or higher than the acid dew point and the sulfuric acid corrosion of the dedusting apparatus can be prevented. It is an object of the present invention to provide a temperature control method and apparatus.
- the present invention relates to a boiler that generates steam by burning fuel with a combustion gas, a preheater that preheats the combustion gas using exhaust gas discharged from the boiler, and an exhaust gas that cools the exhaust gas that has passed through the preheater.
- a dedusting device inlet temperature control method for an oxyfuel boiler facility comprising a recirculation line and an oxygen production device for supplying oxygen to the exhaust gas recirculated by the exhaust gas recirculation line,
- the inlet temperature of the dedusting device is measured, and the temperature of the inlet of the oxyfuel boiler equipment for circulating the combustion gas bypassing the preheater so that the measured inlet temperature becomes a set temperature equal to or higher than the acid dew point. It depends on the control method.
- the measured inlet temperature is set to a set temperature equal to or higher than the acid dew point. It is preferable to distribute the exhaust gas by bypassing the exhaust gas cooler.
- the present invention also provides a boiler that generates steam by burning fuel with a combustion gas, a preheater that preheats the combustion gas with exhaust gas discharged from the boiler, and cools the exhaust gas that has passed through the preheater.
- An exhaust gas cooler that collects the dust in the exhaust gas cooled by the exhaust gas cooler, and the exhaust gas from which the dust is collected by the dust removal apparatus is recirculated as part of the combustion gas of the boiler
- An exhaust gas recirculation line, and an oxygen production apparatus for supplying oxygen to the exhaust gas recirculated by the exhaust gas recirculation line, a dedusting device inlet temperature control device for an oxyfuel boiler facility, A combustion gas bypass line for circulating the combustion gas so as to bypass the preheater; A combustion gas flow rate adjusting damper provided in the combustion gas bypass line;
- a thermometer for measuring an inlet temperature of the dust removing device;
- a dedusting device inlet temperature of an oxyfuel boiler facility comprising: a controller that outputs an
- an exhaust gas bypass line for circulating the exhaust gas so as to bypass the exhaust gas cooler
- An exhaust gas flow rate adjusting damper provided in the exhaust gas bypass line
- the controller adjusts the exhaust gas flow rate so that the inlet temperature measured by the thermometer becomes a set temperature equal to or higher than the acid dew point after the combustion gas flow rate adjustment damper is fully opened and the inlet temperature control reaches a limit. It is preferable to output an opening adjustment signal to the damper.
- the exhaust gas cooler outlet can be maintained at a temperature equal to or higher than the acid dew point, and the excellent effect that sulfuric acid corrosion of the dedusting device can be prevented. Can play.
- FIG. 1 and FIG. 2 show a first embodiment of a method and an apparatus for controlling the temperature at the inlet of a dedusting device for an oxyfuel boiler facility according to the present invention.
- the oxyfuel boiler facility shown in FIG. 1 includes a boiler 1, a mill 2, preheaters 3 and 4, an exhaust gas cooler 5, a dust removing device 6, an induction fan 7 (IDF), an exhaust gas line 8, An exhaust gas recirculation line 8 ⁇ / b> R, a forced air fan 9 (FDF), a dehydrator 10, and an oxygen production device 11 are provided.
- the boiler 1 burns fuel with combustion gas to generate steam, and exhaust gas is discharged to the exhaust gas line 8.
- the mill 2 pulverizes coal as the fuel.
- the preheater 3 preheats the carrier gas introduced into the mill 2 with the exhaust gas discharged from the boiler 1.
- the preheater 4 preheats the combustion gas with the exhaust gas discharged from the boiler 1.
- the exhaust gas cooler 5 cools the exhaust gas that has passed through the preheater 4.
- the dust removing device 6 is a bag filter or an electric dust collector, and collects the dust in the exhaust gas cooled by the exhaust gas cooler 5.
- the exhaust gas in which the dust is collected by the dust removing device 6 is used as the combustion gas for the boiler 1 and the conveying gas for the pulverized coal by the operation of the induction fan 7 and the forced air fan 9. It is designed to recirculate.
- the dehydrator 10 removes moisture from the exhaust gas recirculated as the pulverized coal transport gas.
- the oxygen production apparatus 11 supplies oxygen to exhaust gas recirculated as combustion gas for the boiler 1.
- a combustion gas bypass line that connects the inlet side position and the outlet side position of the preheater 4 in the exhaust gas recirculation line 8R so that the combustion gas flows around the preheater 4.
- a combustion gas flow rate adjusting damper 13 is provided in the combustion gas bypass line 12
- an inlet temperature 14 a of the dust removing device 6 is measured by a thermometer 14.
- the inlet temperature 14a measured with the said thermometer 14 is input into the controller 15, and it controls based on the comparison result with preset temperature (for example, 150 degreeC) more than the acid dew point preset to this controller 15
- preset temperature for example, 150 degreeC
- the opening temperature adjustment signal 13a is output from the vessel 15 to the combustion gas flow rate adjustment damper 13, so that the inlet temperature 14a is set to a set temperature equal to or higher than the acid dew point.
- step S1 the inlet temperature 14a of the dust removing device 6 is measured by the thermometer 14.
- step S2 it is determined whether or not the inlet temperature 14a is equal to or higher than the acid dew point. If it is determined in step S2 that the inlet temperature 14a is not equal to or higher than the acid dew point, the opening degree of the combustion gas flow rate adjustment damper 13 is adjusted in step S3. Returning to step S1 again, the inlet temperature 14a of the dust removing device 6 is measured. If the inlet temperature 14a is equal to or higher than the acid dew point in the subsequent step S2, the control is terminated. When it is determined in step S2 that the inlet temperature 14a is not higher than the acid dew point, the inlet temperature control by adjusting the opening of the combustion gas flow rate adjusting damper 13 is repeatedly performed in step S3. ing.
- the pulverized coal as the fuel obtained by pulverizing the coal in the mill 2 is supplied to the boiler 1 by the conveying gas preheated by the preheater 3, and combusted by the combustion gas preheated by the preheater 4 in the boiler 1, Steam is generated by the combustion heat.
- Exhaust gas discharged from the boiler 1 to the exhaust gas line 8 gives heat to the carrier gas when passing through the preheater 3, and further gives heat to the combustion gas when passing through the preheater 4.
- the exhaust gas is cooled by the exhaust gas cooler 5, and then dust is collected by the dust removing device 6. From 8R, it is recirculated as a combustion gas for the boiler 1 and a conveying gas for pulverized coal.
- thermometer 14 measures the inlet temperature 14a of the dust removing device 6 (see step S1 in FIG. 2), and whether the inlet temperature 14a is equal to or higher than the acid dew point. It is determined whether or not (see step S2 in FIG. 2).
- step S3 in FIG. 2 When the inlet temperature 14a is not higher than the acid dew point, the degree of opening of the combustion gas flow rate adjustment damper 13 is adjusted (see step S3 in FIG. 2), and the combustion gas bypass line 12 is bypassed by bypassing the preheater 4. The flow rate of the flowing combustion gas is increased, and the exhaust gas temperature at the high temperature side outlet of the preheater 4 is increased. Thereafter, the process returns to step S1 again to measure the inlet temperature 14a of the dust removing device 6. If the inlet temperature 14a is equal to or higher than the acid dew point in the subsequent step S2, the control is ended.
- step S2 when the inlet temperature 14a is not higher than the acid dew point, the inlet temperature control by adjusting the opening of the combustion gas flow control damper 13 is repeatedly performed.
- the combustion gas flow control damper 13 is opened.
- the outlet of the exhaust gas cooler 5 can be maintained at a temperature higher than the acid dew point, and sulfuric acid corrosion of the dust removing device 6 can be prevented.
- FIGS. 3 and 4 show a second embodiment of the method and apparatus for controlling the temperature at the inlet of the dedusting device of the oxyfuel boiler equipment of the present invention.
- the same reference numerals as those in FIGS. 1 and 2 denote the same components.
- the basic configuration is the same as that of the first embodiment shown in FIGS. 1 and 2, but the feature of the second embodiment is that it bypasses the exhaust gas cooler 5 as shown in FIGS.
- the exhaust gas bypass line 16 that connects the inlet side position and the outlet side position of the exhaust gas cooler 5 in the exhaust gas line 8 is provided so that the exhaust gas flows, and the exhaust gas flow rate regulation damper 17 is provided in the exhaust gas bypass line 16. is there.
- the control is performed based on the comparison result between the inlet temperature 14a and the set temperature.
- the opening temperature adjustment signal 17a is output from the vessel 15 to the exhaust gas flow rate adjustment damper 17, so that the inlet temperature 14a becomes a set temperature equal to or higher than the acid dew point.
- step S1 the inlet temperature 14a of the dust removing device 6 is measured by the thermometer 14.
- step S2 it is determined whether or not the inlet temperature 14a is equal to or higher than the acid dew point. If it is determined in step S2 that the inlet temperature 14a is not higher than the acid dew point, it is determined in step S4 whether or not the inlet temperature control by the combustion gas flow control damper 13 is the limit. If it is determined in step S4 that the inlet temperature control by the combustion gas flow rate adjustment damper 13 is not the limit, the opening degree of the combustion gas flow rate adjustment damper 13 is adjusted in step S3.
- step S1 the inlet temperature 14a of the dust removing device 6 is measured. If the inlet temperature 14a is equal to or higher than the acid dew point in the subsequent step S2, the control is terminated. If it is determined in step S2 that the inlet temperature 14a is not equal to or higher than the acid dew point, after step S4, inlet temperature control is performed by adjusting the opening of the combustion gas flow control damper 13 in step S3. Repeat. Thereafter, when it is determined in step S4 that the inlet temperature control by the combustion gas flow rate adjusting damper 13 has reached the limit, in step S5, the opening degree of the exhaust gas flow rate adjusting damper 17 is adjusted, and the steps S1, S2 are performed. , S4 and S5 are repeatedly performed. The opening degree adjustment of the exhaust gas flow rate adjustment damper 17 in the step S5 is continued until the inlet temperature 14a reaches a set temperature equal to or higher than the acid dew point.
- thermometer 14 measures the inlet temperature 14a of the dust removing device 6 (see step S1 in FIG. 2), and the inlet temperature 14a is higher than the acid dew point. It is determined whether or not the temperature is (see step S2 in FIG. 2).
- the opening degree of the combustion gas flow rate adjustment damper 13 is adjusted (see step S3 in FIG. 2), and the preheater 4 is bypassed for combustion.
- the flow rate of the combustion gas flowing through the gas bypass line 12 is increased, and the high temperature side outlet exhaust gas temperature of the preheater 4 is increased.
- the process returns to step S1 again to measure the inlet temperature 14a of the dust removing device 6. If the inlet temperature 14a is equal to or higher than the acid dew point in the subsequent step S2, the control is ended.
- step S2 when the inlet temperature 14a is not higher than the acid dew point, the inlet temperature control by adjusting the opening of the combustion gas flow control damper 13 is repeatedly performed.
- the opening degree of the exhaust gas flow rate adjustment damper 17 is adjusted (see FIG. 2), the flow rate of the exhaust gas that bypasses the exhaust gas cooler 5 and flows through the exhaust gas bypass line 16 is increased, and the exhaust gas temperature at the outlet of the exhaust gas cooler 5 is increased.
- the opening degree adjustment of the exhaust gas flow rate adjustment damper 17 is continued until the inlet temperature 14a reaches a set temperature equal to or higher than the acid dew point.
- the combustion gas Exhaust gas cooled by the exhaust gas cooler 5 by adjusting the opening degree of the flow rate adjusting damper 13 to increase the exhaust gas temperature at the high temperature side outlet of the preheater 4 and further adjusting the opening degree of the exhaust gas flow rate adjusting damper 17 as necessary.
- the temperature drop of the exhaust gas can be suppressed.
- the outlet of the exhaust gas cooler 5 can be maintained at a temperature equal to or higher than the acid dew point, and sulfuric acid corrosion of the dust removing device 6 can be prevented.
- the measured inlet temperature 14a is set to a set temperature equal to or higher than the acid dew point. If the exhaust gas is circulated by bypassing the exhaust gas cooler 5, the range of control is widened, which is more preferable in preventing sulfuric acid corrosion of the dust removing device 6.
- the exhaust gas bypass line 16 for circulating the exhaust gas so as to bypass the exhaust gas cooler 5, and the exhaust gas flow rate adjustment damper 17 provided in the exhaust gas bypass line 16. Can be provided.
- the controller 15 causes the inlet temperature 14a measured by the thermometer 14 to become a set temperature equal to or higher than the acid dew point.
- An opening degree adjustment signal 17 a is output to the exhaust gas flow rate adjustment damper 17.
- the inlet temperature control by the exhaust gas flow rate adjustment damper 17 is performed as a backup of the inlet temperature control by the combustion gas flow rate adjustment damper 13, the range of control is widened, and in order to prevent sulfuric acid corrosion of the dust removing device 6. preferable.
- dedusting device inlet temperature control method and apparatus of the oxyfuel boiler equipment of the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. Of course.
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Abstract
Description
前記脱塵装置の入口温度を測定し、該測定された入口温度が酸露点以上の設定温度となるよう前記燃焼用ガスを予熱器を迂回させて流通させる酸素燃焼ボイラ設備の脱塵装置入口温度制御方法にかかるものである。
前記予熱器を迂回するよう前記燃焼用ガスを流通させる燃焼用ガスバイパスラインと、
該燃焼用ガスバイパスラインに設けられた燃焼用ガス流量調節ダンパと、
前記脱塵装置の入口温度を測定する温度計と、
該温度計で測定された入口温度を酸露点以上の設定温度とするよう前記燃焼用ガス流量調節ダンパへ開度調節信号を出力する制御器と
を備えた酸素燃焼ボイラ設備の脱塵装置入口温度制御装置にかかるものである。
該排ガスバイパスラインに設けられた排ガス流量調節ダンパとを備え、
前記制御器は、前記燃焼用ガス流量調節ダンパが全開となって入口温度制御が限界に達した後、前記温度計で測定された入口温度が酸露点以上の設定温度となるよう前記排ガス流量調節ダンパへ開度調節信号を出力することが好ましい。
4 予熱器
5 排ガスクーラ
6 脱塵装置
8R 排ガス再循環ライン
11 酸素製造装置
12 燃焼用ガスバイパスライン
13 燃焼用ガス流量調節ダンパ
13a 開度調節信号
14 温度計
14a 入口温度
15 制御器
16 排ガスバイパスライン
17 排ガス流量調節ダンパ
17a 開度調節信号
Claims (4)
- 燃料を燃焼用ガスにより燃焼させて蒸気を発生するボイラと、該ボイラから排出される排ガスによって前記燃焼用ガスを予熱する予熱器と、該予熱器を通過した排ガスを冷却する排ガスクーラと、該排ガスクーラで冷却された排ガス中の煤塵を捕集する脱塵装置と、該脱塵装置で煤塵が捕集された排ガスを前記ボイラの燃焼用ガスの一部として再循環させる排ガス再循環ラインと、該排ガス再循環ラインにより再循環される排ガスに酸素を供給する酸素製造装置とを備えた酸素燃焼ボイラ設備の脱塵装置入口温度制御方法であって、
前記脱塵装置の入口温度を測定し、該測定された入口温度が酸露点以上の設定温度となるよう前記燃焼用ガスを予熱器を迂回させて流通させる酸素燃焼ボイラ設備の脱塵装置入口温度制御方法。 - 前記燃焼用ガスの予熱器の迂回による入口温度制御が限界に達した後、前記測定された入口温度が酸露点以上の設定温度となるよう前記排ガスを排ガスクーラを迂回させて流通させる請求項1記載の酸素燃焼ボイラ設備の脱塵装置入口温度制御方法。
- 燃料を燃焼用ガスにより燃焼させて蒸気を発生するボイラと、該ボイラから排出される排ガスによって前記燃焼用ガスを予熱する予熱器と、該予熱器を通過した排ガスを冷却する排ガスクーラと、該排ガスクーラで冷却された排ガス中の煤塵を捕集する脱塵装置と、該脱塵装置で煤塵が捕集された排ガスを前記ボイラの燃焼用ガスの一部として再循環させる排ガス再循環ラインと、該排ガス再循環ラインにより再循環される排ガスに酸素を供給する酸素製造装置とを備えた酸素燃焼ボイラ設備の脱塵装置入口温度制御装置であって、
前記予熱器を迂回するよう前記燃焼用ガスを流通させる燃焼用ガスバイパスラインと、
該燃焼用ガスバイパスラインに設けられた燃焼用ガス流量調節ダンパと、
前記脱塵装置の入口温度を測定する温度計と、
該温度計で測定された入口温度を酸露点以上の設定温度とするよう前記燃焼用ガス流量調節ダンパへ開度調節信号を出力する制御器と
を備えた酸素燃焼ボイラ設備の脱塵装置入口温度制御装置。 - 前記排ガスクーラを迂回するよう前記排ガスを流通させる排ガスバイパスラインと、
該排ガスバイパスラインに設けられた排ガス流量調節ダンパとを備え、
前記制御器は、前記燃焼用ガス流量調節ダンパが全開となって入口温度制御が限界に達した後、前記温度計で測定された入口温度が酸露点以上の設定温度となるよう前記排ガス流量調節ダンパへ開度調節信号を出力する請求項3記載の酸素燃焼ボイラ設備の脱塵装置入口温度制御装置。
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