JP5324701B2 - Carbon dioxide recovery type power generation system - Google Patents

Carbon dioxide recovery type power generation system Download PDF

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JP5324701B2
JP5324701B2 JP2012504158A JP2012504158A JP5324701B2 JP 5324701 B2 JP5324701 B2 JP 5324701B2 JP 2012504158 A JP2012504158 A JP 2012504158A JP 2012504158 A JP2012504158 A JP 2012504158A JP 5324701 B2 JP5324701 B2 JP 5324701B2
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carbon dioxide
desorption
gas
downstream
combustion exhaust
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JPWO2011111116A1 (en
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久幸 折田
正明 向出
信幸 穂刈
強 柴田
大樹 佐藤
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株式会社日立製作所
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/75Multi-step processes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/06Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/006Layout of treatment plant
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/30Sulfur compounds
    • B01D2257/302Sulfur oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/40Nitrogen compounds
    • B01D2257/404Nitrogen oxides other than dinitrogen oxide
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/50Carbon oxides
    • B01D2257/504Carbon dioxide
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/02Other waste gases
    • B01D2258/0283Flue gases
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2259/00Type of treatment
    • B01D2259/65Employing advanced heat integration, e.g. Pinch technology
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00Preventing emissions
    • F23J2215/10Nitrogen; Compounds thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00Preventing emissions
    • F23J2215/50Carbon dioxide
    • Y02C10/04
    • Y02C10/08
    • Y02E20/326

Abstract

Disclosed is a carbon dioxide recovery-type power generating system that comprises a boiler that burns coal; a NOx removal device disposed downstream of the boiler, that removes nitrogen oxide in boiler combustion exhaust gas; a heat exchanger disposed downstream of the NOx removal device, that recovers combustion gas heat; a precipitator disposed downstream of the heat exchanger, that removes smoke dust in the combustion exhaust gas; desulfurization equipment disposed downstream of the precipitator, that removes sulfur oxides in combustion exhaust gas; and a regenerative-type carbon dioxide recovery and desorption device disposed downstream of the desulfurization equipment, that holds a carbon dioxide absorbent. A regenerative-type carbon-dioxide absorption and desorption device removes absorbed carbon dioxide by ventilating combustion exhaust gas, and a portion of air heated at the heat exchanger as desorbed gas, absorbing carbon dioxide in the combustion exhaust gas, and ventilating the desorbed gas, at a portion that ventilates the combustion gas.

Description

  The present invention relates to a carbon dioxide recovery type power generation system, and more particularly to an apparatus for absorbing and desorbing carbon dioxide in combustion exhaust gas, which is required in a carbon dioxide recovery type power generation system.

  In recent years, global warming has been taken up as a global environmental problem. It has been clarified that an increase in the concentration of carbon dioxide in the atmosphere is the main cause of global warming, and the reduction of carbon dioxide emissions has become important for the prevention of global warming.

A coal-fired power plant is a powerful emission source of carbon dioxide (hereinafter referred to as “CO 2 ”), and it has been a problem to separate and recover CO 2 in combustion exhaust gas with high efficiency.

As a technique for separating and recovering CO 2 in combustion exhaust gas, Patent Document 1 discloses an apparatus and method for recovering CO 2 using an absorbing liquid. CO 2 recovery apparatus according to Patent Document 1, an absorption tower for absorbing CO 2 in the absorbing solution, and a regenerator (regeneration tower) for reproducing the absorption liquid desorbed CO 2 from the absorbing solution. As the absorption liquid, a liquid that selectively absorbs CO 2 is used. The CO 2 in the low flue gas having CO 2 concentration absorbed in the absorption tower, the CO 2 concentration by causing the CO 2 in the regenerator eliminated to a high concentration, liquefaction of CO 2, and raising the efficiency of collection.

Patent Document 2 discloses a method and apparatus for separating CO 2 using a solid CO 2 absorbent. In this case, the separator CO 2 includes an absorption tower for absorbing CO 2, the CO 2 is desorbed, consisting regenerator to regenerate the solid CO 2 absorbent.

Even solid CO 2 absorbent may be CO 2 absorbing solution, the CO 2 to desorb, because it requires a temperature higher than the temperature at the time of absorption, low desorption energy, desorption Absorbents and absorbents with low temperature are required. The absorbent has an advantage that the maintenance cost is not required as compared with the absorbent. However, since the desorption temperature of CO 2 is as high as 600 ° C. to 900 ° C., the energy for heating the absorbent is large. For this reason, energy saving is an issue in the CO 2 absorption and desorption apparatus.

Patent Document 3 discloses a rotary regeneration type CO 2 absorption and desorption apparatus in which a CO 2 absorption tower and a desorption tower are integrated to save space. In this CO 2 absorption / desorption device, a rotating body is filled with a CO 2 absorbent, a low-temperature gas having a high CO 2 concentration is passed through half of the rotating body to absorb CO 2, and a high-temperature gas is absorbed into the other half. To desorb CO 2 . As the rotator rotates, CO 2 is absorbed and desorbed simultaneously.

JP 2007-284272 A JP-A-8-24571 JP 2001-205045 A

The present invention is directed to a CO 2 recovery type power generation system including a rotary regeneration type CO 2 absorption / desorption device. In rotary regenerative type CO 2 absorption desorption apparatus, for heating the CO 2 absorber of CO 2 desorbed, energy saving of the CO 2 recovery system is an issue. In addition, the heating of the CO 2 absorbent requires ventilation of high-temperature gas. When the amount of high-temperature gas is large, the CO 2 concentration in the desorbed gas decreases, so it is also a problem to suppress the amount of high-temperature gas flow and maintain the CO 2 concentration in the desorbed gas at a high concentration.

The present invention provides a CO 2 recovery power generation system that solves the above problems.

  In order to solve the above problems, a carbon dioxide recovery power generation system according to the present invention has the following features.

  A boiler that burns coal; a denitration device that is installed on the downstream side of the boiler and removes nitrogen oxides from the combustion exhaust gas of the boiler; and is installed on the downstream side of the denitration device, and heats the combustion exhaust gas. A heat exchanger to be recovered, a dust collector installed on the downstream side of the heat exchanger to remove the dust in the combustion exhaust gas, and a downstream of the dust collector, A desulfurization apparatus for removing sulfur oxides, and a rotation regeneration type carbon dioxide absorption and desorption apparatus that is installed on the downstream side of the desulfurization apparatus and holds a carbon dioxide absorbent.

  The rotation regeneration type carbon dioxide absorption and desorption device is configured such that the combustion exhaust gas and a part of the air heated by the heat exchanger as a desorption gas are vented, and the combustion exhaust gas is vented. The carbon dioxide in the exhaust gas is absorbed, and the absorbed carbon dioxide is desorbed at a portion where the desorbed gas is vented.

  Moreover, the carbon dioxide recovery type power generation system according to the present invention has the following features.

  A boiler that burns coal; a heat recovery heat exchanger that is installed downstream of the boiler and recovers heat of the combustion exhaust gas of the boiler; and is installed downstream of the heat recovery heat exchanger, A dust collector that removes soot in the interior, a desulfurizer that is installed downstream of the dust collector, removes sulfur oxides in the combustion exhaust gas, and a downstream of the desulfurizer, carbon dioxide The rotation regeneration type carbon dioxide absorption / desorption device holding the absorbent, and the combustion using heat recovered by the heat recovery heat exchanger installed downstream of the rotation regeneration type carbon dioxide absorption / desorption device A reheating heat exchanger that reheats the exhaust gas, a denitration device that is installed on the downstream side of the reheating heat exchanger, removes nitrogen oxides in the combustion exhaust gas, and is installed on the downstream side of the denitration device, Air heating to recover the heat of the combustion exhaust gas And a heat exchanger.

In the case of this configuration, the rotation regeneration type carbon dioxide absorption / desorption device allows the combustion exhaust gas and a part of the air heated by the air heating heat exchanger to pass through as the desorption gas, so that the combustion exhaust gas is The carbon dioxide absorbent is formed of mesoporous silica, which absorbs carbon dioxide in the combustion exhaust gas at the aeration portion and desorbs the absorbed carbon dioxide at the portion where the desorption gas aerates. It is preferable that at least one element selected from the group consisting of Ca, Sr, Ba, Y and La is supported on the mesoporous silica.

  Preferably, the desorption gas that has passed through the rotation regeneration type carbon dioxide absorption / desorption device is moved from a circulation branch point on the downstream side to the circulation junction point on the upstream side of the rotation regeneration type carbon dioxide absorption / desorption device. Is circulated through a pipe, and the rotary regeneration type carbon dioxide absorption and desorption apparatus is ventilated again.

In the carbon dioxide recovery type power generation system according to the present invention, in the regenerative CO 2 absorption / desorption apparatus, the heat is effectively utilized at the time of desorption of CO 2 , and the desorption temperature of the CO 2 absorbent is lowered. Separation energy can be reduced, and energy saving of the CO 2 recovery system becomes possible. Further, in the rotary regeneration type CO 2 absorption and desorption apparatus, the necessary amount of the high temperature gas is suppressed by circulating the high temperature gas that is ventilated to the portion where the desorption gas is vented (CO 2 desorption side), and the desorption gas The CO 2 concentration can be maintained at a high concentration.

Block diagram showing the basic configuration of the CO 2 capture power generation system according to the present invention. It shows a rotary regenerative type CO 2 absorption desorption apparatus according to the present invention. Block diagram of a CO 2 capture power generation system according to Example 1 of the present invention. Block diagram of a CO 2 capture power generation system according to Example 2 of the present invention. Implementation in CO 2 capture power generation system according to Example 3, a block diagram illustrating an example of a CO 2 enrichment method of the desorbed gas of the present invention. Block diagram of the CO 2 capture power generation system according to Example 3 shows another example of a CO 2 enrichment method of the desorbed gas of the present invention.

Hereinafter, carbon dioxide is expressed as “CO 2 ”, nitrogen oxides as “NOx”, and sulfur oxides as “SOx”.

The carbon dioxide recovery power generation system according to the present invention includes a rotation regeneration type CO 2 absorption and desorption device. The rotary regeneration type CO 2 absorption and desorption device is an integrated unit of a CO 2 absorption tower and a desorption tower, and holds a CO 2 absorbent inside.

FIG. 1 shows a basic configuration of a CO 2 recovery type power generation system according to the present invention. In the following description, “downstream” and “upstream” are directions along the flow of combustion exhaust gas and desorbed gas.

The CO 2 recovery type power generation system includes a denitration device 2 that reduces NOx in combustion exhaust gas to nitrogen, an air heating heat exchanger 3 that recovers heat of the combustion exhaust gas, and heat recovery on the downstream side of the boiler 1 that burns coal. A heat exchanger 4, a dry electrostatic precipitator 5 that removes coal ash in the combustion exhaust gas, and a desulfurization device 6 that removes SOx in the combustion exhaust gas are provided. Further, on the downstream side of desulfurizer 6, a wet electrostatic precipitator 7, and the rotary regenerative CO 2 absorption desorption device 8 for holding the CO 2 absorbent, the reheating heat exchanger 9, the compressor (CO 2 recovery device) 14.

  A part of SOx in the combustion exhaust gas is converted into sulfuric acid gas by the boiler 1 and the denitration device 2, and becomes a mist in the middle of the dry electrostatic precipitator 5 or below the acid dew point by the desulfurization device 6. Since this mist cannot be removed by the desulfurization device 6, it is removed by the wet electrostatic precipitator 7.

  Air 20 is sent to the air heating heat exchanger 3 by an air supply fan 28. The air 20 is heated by heat exchange with the combustion exhaust gas in the air heating heat exchanger 3, becomes high temperature, and is supplied to the boiler 1.

It is desirable to provide the rotary regeneration type CO 2 absorption / desorption device 8 on the downstream side of the wet electrostatic precipitator 7. If the ventilation is flue gas that contains dust, the dust is contained in the rotary regenerative CO 2 absorption desorption device 8 attached to the CO 2 absorbent, the CO 2 absorbing performance of the CO 2 absorbent is reduced Because. Moreover, when the temperature of combustion exhaust gas falls, sulfuric acid gas will mist. The CO 2 absorbent has a reduced CO 2 absorption performance even when sulfuric acid mist adheres. Also from this, it is preferable to provide the rotary regeneration type CO 2 absorption / desorption device 8 on the downstream side of the wet electrostatic precipitator 7 for removing sulfuric acid mist.

The combustion exhaust gas after the CO 2 is absorbed by the rotary regeneration type CO 2 absorption / desorption device 8 is heated by the reheating heat exchanger 9 and exhausted from the chimney 10 so as not to become white smoke.

In the compressor 14, the combustion exhaust gas that has passed through the rotary regeneration type CO 2 absorption / desorption device 8 is compressed, and the CO 2 22 is liquefied and recovered. Further, the non-condensable gas 23 that has not been compressed by the compressor 14 is exhausted.

CO 2 absorbent rotary regenerative CO 2 absorption desorption device 8 is held, with the rotation of the rotary regenerative CO 2 absorption desorption device 8, absorbs CO 2, eliminated. From CO 2 absorbent in order to the CO 2 elimination, the desorbed gas 24 is heated by the heater 27 to more CO 2 desorption temperature of CO 2 absorber, the rotary regenerative type CO 2 absorption desorption device 8 Supply. As the desorption gas 24, for example, water vapor generated from the boiler 1 can be used. The supply amount of the desorption gas 24 can be changed by adjusting the opening degree of the desorption gas supply valve 21.

FIG. 2 shows a rotary regeneration type CO 2 absorption and desorption apparatus. The rotary regeneration type CO 2 absorption / desorption device 8 includes a cylindrical rotary body 40, and a CO 2 absorbent is held in each of the spaces obtained by dividing the rotary body 40 in the circumferential direction. The CO 2 absorbent does not flow out due to gas ventilation. For example, if the CO 2 absorbent is held in the particle packed bed 41, the particle packed bed 41 is surrounded by a mesh 42 finer than the CO 2 absorbent particles to prevent the CO 2 absorbent from flowing out. Alternatively, the inside of the rotary regeneration type CO 2 absorption / desorption device 8 is formed into a honeycomb structure 43, and the CO 2 absorbent is applied to the surface thereof and vapor deposited to prevent the CO 2 absorbent from flowing out.

CO 2 absorbent rotary regenerative CO 2 absorption desorption device 8 is held therein are formed in the mesoporous silica, to which Mg, Ca, Sr, Ba, at least one selected from the group consisting of Y and La Those carrying these elements are desirable. This CO 2 absorbent has a CO 2 desorption temperature of 400 ° C. or lower, and can desorb CO 2 at a lower temperature than conventional absorbents.

A vent pipe 44 and a vent pipe 45 are connected to the rotary regeneration type CO 2 absorption / desorption device 8. The vent pipe 44 allows combustion exhaust gas to pass through the rotating body 40, and the vent pipe 45 allows hot gas (desorption gas) to pass through the rotating body 40. The combustion exhaust gas and the desorbed gas are passed through the rotating body 40 so as to face each other along the rotation axis.

In the rotating body 40, in the portion where the combustion exhaust gas is ventilated (hereinafter referred to as “CO 2 absorption side”), the portion where the CO 2 absorbent absorbs CO 2 and the desorbed gas is vented (hereinafter referred to as “CO 2 absorption side”). In the “CO 2 desorption side”), CO 2 is desorbed from the CO 2 absorbent. That is, the inside of the CO 2 absorbent of the rotating body 40 is rotated by, it absorbs CO 2 come into CO 2 absorption side and desorption of CO 2 come into CO 2 desorption side.

In the following embodiments, the combustion exhaust gas is ventilated in the radial cross section half of the rotating body 40, and the desorption gas is ventilated in the remaining radial cross section half. That is, in the rotating body 40, one half of the radial cross section is the CO 2 absorption side, and the other half of the cross section is the CO 2 desorption side. By rotating body 40 rotates, CO 2 absorbent rotary regenerative CO 2 absorption desorption device 8 is held absorbs continuously CO 2, eliminated.

By making the CO 2 absorption / desorption device a rotary regeneration type, the absorption device and the desorption device can be integrated into one device, and the CO 2 absorption / desorption device has a separate absorption tower and separation tower. However, the size of the apparatus can be reduced and the site area can be reduced.

The present invention is based on the configuration of the CO 2 recovery type power generation system shown in FIG. 1 and uses the rotary regeneration type CO 2 absorption / desorption device shown in FIG. 2 as the CO 2 absorption / desorption device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 3 is a block diagram showing a CO 2 recovery type power generation system when air heated by a heat exchanger is used as desorption gas according to the present embodiment. 3, the same reference numerals as those in FIG. 1 denote the same or common elements as those in FIG.

A part of the air 20 heated by the air heating heat exchanger 3 was used as the desorption gas 24 for desorbing CO 2 from the CO 2 absorbent. The air 20 feed air supply fan 28 to the air heating heat exchanger 3, and a high temperature by the combustion exhaust gas heat exchanger, a rotary regenerative CO 2 absorption desorption device 8 a part by desorption gas supply valve 21 Vent to the CO 2 desorption side. The remainder of the air 20 that has become hot is supplied to the boiler 1.

The desorption gas 24 is heated by the heater 27 if the temperature is lower than the desorption temperature of CO 2. However, since the desorption gas 24 is heated by the air heating heat exchanger 3 in advance, the heating energy of the heater 27 should be reduced. Can do.

Since the gas after desorption should have a high CO 2 concentration, it is desirable to adjust the opening degree of the desorption gas supply valve 21 so that the supply amount of the desorption gas 24 is minimized.

The rotary regeneration type CO 2 absorption / desorption device 8 is formed of mesoporous silica as a CO 2 absorbent, and at least one element selected from the group consisting of Mg, Ca, Sr, Ba, Y, and La is added thereto. Holds what is carried. Since CO 2 desorption temperature of the CO 2 absorbent is 400 ° C. or less, it can be eliminated of CO 2 at a lower temperature than the conventional absorbent.

As described above, the CO 2 recovery type power generation system according to the present embodiment can realize energy saving by effectively using the heat of the combustion exhaust gas and lowering the CO 2 desorption temperature of the CO 2 absorbent.

FIG. 4 is a block diagram showing another CO 2 recovery type power generation system when air heated by a heat exchanger is used as desorption gas according to the present embodiment. 4, the same reference numerals as those in FIG. 3 denote the same or common elements as those in FIG.

The denitration device 2 holds a denitration catalyst and purifies NOx in the combustion exhaust gas using ammonia (NH 3 ). The denitration catalyst is used in the range of 350 ° C to 400 ° C. Depending on the type of denitration catalyst, the performance may be reduced by SOx. When such a denitration catalyst is used, the combustion exhaust gas from which SOx has been removed is reheated from 350 ° C. to 400 ° C. downstream of the desulfurization device 6. It is necessary to provide a denitration device 2 on the downstream side.

The CO 2 recovery power generation system according to this embodiment shown in FIG. 4 has such a configuration. That is, a heat recovery heat exchanger 4 that recovers the heat of the combustion exhaust gas on the downstream side of the boiler 1 that burns coal, a dry electric dust collector 5 that removes the dust in the combustion exhaust gas on the downstream side, and its downstream Desulfurizer 6 for removing SOx in combustion exhaust gas on the side, wet electrostatic precipitator 7 for removing sulfuric acid mist, rotary regenerative CO 2 absorption and desorption device 8 on the downstream side, and heat recovery on the downstream side A reheating heat exchanger 9 for reheating the combustion exhaust gas with the heat recovered by the heat exchanger 4, a denitration device 2 for removing NOx in the combustion exhaust gas on the downstream side, and recovering the heat of the combustion exhaust gas on the downstream side And an air heating heat exchanger 3. By using the heat recovery heat exchanger 4 and the reheating heat exchanger 9, the combustion exhaust gas at the outlet of the desulfurization device 6 can be raised to the use temperature of the denitration catalyst, and the denitration device 2 is provided downstream of the desulfurization device 6. Is possible.

  Further, since the temperature of the combustion exhaust gas in the denitration device 2 is 350 ° C. to 400 ° C., an air heating heat exchanger 3 for recovering the heat of the combustion exhaust gas is provided on the downstream side of the denitration device 2 to effectively use the heat. ing.

Rotary regenerative type CO 2 absorption desorption device 8, in order to avoid a decrease in absorption performance of the CO 2 by ash adhesion to CO 2 absorber, it is preferably provided on the downstream side of dry electrostatic precipitator 5. Furthermore, in order to avoid a decrease in the absorption performance of CO 2 due to the mist formation of sulfuric acid gas, it is desirable to be on the downstream side of the wet electrostatic precipitator 7. Therefore, the rotary regeneration type CO 2 absorption / desorption device 8 is provided between the wet electrostatic precipitator 7 and the reheating heat exchanger 9.

Further, the combustion heat exhaust gas and the air 20 are heat-exchanged by the air heating heat exchanger 3, and a part of the heated air 20 is used as a desorption gas 24 for desorbing CO 2 from the CO 2 absorbent. The CO 2 absorption / desorption device 8 is supplied.

Since CO 2 is absorbed on the upstream side of the denitration device 2, the amount of combustion exhaust gas is reduced, and the capacity of the denitration device 2 can be reduced.

CO 2 absorbent rotary regenerative CO 2 absorption desorption device 8 is held, with the rotation of the rotary regenerative CO 2 absorption desorption device 8, absorbs CO 2, eliminated. From CO 2 absorbent in order to the CO 2 elimination, the desorbed gas 24 is heated by the heater 27 to more CO 2 desorption temperature of CO 2 absorber, the rotary regenerative type CO 2 absorption desorption device 8 Supply. The gas after desorption should have a high CO 2 concentration, and it is desirable to adjust the opening of the desorption gas supply valve 21 so that the supply amount of the desorption gas 24 is minimized.

  Although the desorption gas 24 is heated by the heater 27, since it is heated by the air heating heat exchanger 3 in advance, the heating energy of the heater 27 can be reduced.

CO 2 absorbent rotary regenerative CO 2 absorption desorption device 8 is held therein are formed in the mesoporous silica, to which Mg, Ca, Sr, Ba, at least one selected from the group consisting of Y and La Those carrying these elements are desirable. This CO 2 absorbent has a CO 2 desorption temperature of 400 ° C. or lower, and can desorb CO 2 at a lower temperature than conventional absorbents.

As described above, the CO 2 recovery type power generation system according to the present embodiment can realize energy saving by effectively using the heat of the combustion exhaust gas and lowering the CO 2 desorption temperature of the CO 2 absorbent.

FIG. 5 is a block diagram illustrating an example of a method for increasing the concentration of CO 2 in the desorbed gas in the CO 2 recovery power generation system according to the present embodiment. FIG. 5 is a view showing only the periphery of the rotary regeneration type CO 2 absorption / desorption device 8, the desorption gas supply valve 21, and the compressor (CO 2 recovery device) 14 in FIG. The rotary regeneration type CO 2 absorption / desorption device 8 shows only the CO 2 desorption side (portion where the desorption gas 24 is vented) 13. 5, the same reference numerals as those in FIG. 3 denote the same or common elements as those in FIG.

In the CO 2 recovery type power generation system according to the present embodiment, the desorbed gas 24 after desorbing CO 2 on the CO 2 desorption side 13 of the rotary regeneration type CO 2 absorption / desorption device 8 is guided to the compressor 14. . Compressor 14 compresses the desorbed gas 24, recovered by liquefying CO 2, to exhaust the non-condensable gas. In order to efficiently recover CO 2 with the compressor 14, it is necessary to increase the CO 2 concentration of the desorbed gas 24.

Therefore, in this embodiment, the desorbed gas 24 is circulated so that the desorbed gas 24 passes through the rotary regeneration type CO 2 absorption / desorption device 8 and then flows through the rotary regeneration type CO 2 absorption / desorption device 8 again. Let Specifically, a circulation pipe is provided in the flow path of the desorption gas 24 so that the desorption gas 24 circulates from the downstream side to the upstream side of the CO 2 desorption side 13 of the rotary regeneration type CO 2 absorption / desorption device 8. Thus, the flow path of the desorbed gas 24 is branched. A desorption gas circulation fan 26 is provided in the middle of the circulation pipe. Desorption gas 24 is circulated in this manner, by increasing the frequency of contact between the desorption gas 24 and CO 2 absorbent to suppress the desorbed gas amount, CO 2 removal rotary regenerative CO 2 absorption desorption device 8 The CO 2 concentration at the outlet on the remote side 13 can be increased.

Of the positions where the circulation pipe branches in the flow path of the desorbed gas 24, the downstream position of the rotational regeneration type CO 2 absorption / desorption device 8 is called a circulation branch point 37, and the upstream position is the circulation junction. 38.

Further, a desorption gas adjustment valve 29 for adjusting the flow rate of the desorption gas 24 is provided downstream of the circulation branch point 37. Further, a CO 2 desorption control device 35 that controls the desorption gas control valve 29 is provided. The CO 2 desorption control device 35 is a control device that receives an output signal of the compressor 14 and sends an opening degree signal to the desorption gas adjustment valve 29. Desorbed gas control valve 29, the CO 2 elimination control unit 35, the opening degree in accordance with the output of the compressor 14 to recover CO 2 is controlled. As a result, the desorbed gas 24 can be stably supplied to the compressor 14, and automatic operation of CO 2 recovery by this system becomes possible.

In this embodiment, a CO 2 concentration measuring device 30 is provided between the rotary regeneration type CO 2 absorption / desorption device 8 and the circulation branch point 37. CO 2 concentration measuring device 30, the CO 2 concentration in the desorption gas 24 and outputs the measurement result to the CO 2 elimination control unit 35. The CO 2 desorption control device 35 receives the output signal of the CO 2 concentration measuring device 30 and sends the output signal to the desorption gas circulation fan 26 so that the desorption gas circulation is performed according to the CO 2 concentration of the desorption gas 24. The output of the fan 26 is controlled. As a result, the CO 2 concentration of the desorbed gas 24 supplied to the compressor 14 can be made constant, and automatic operation of CO 2 recovery by this system becomes possible.

In this embodiment, a downstream pressure measuring device 31 is provided downstream of the circulation branch point 37 and an upstream pressure measuring device 32 is provided upstream of the circulation junction 38 and downstream of the desorption gas supply valve 21. . The downstream pressure measuring device 31 and the upstream pressure measuring device 32 each measure the pressure of the desorbed gas 24 and output it to the CO 2 desorption control device 35. The CO 2 desorption control device 35 receives the output signals of the downstream pressure measuring device 31 and the upstream pressure measuring device 32, sends the opening signal to the desorbing gas supply valve 21, and reaches the circulation junction point downstream of the circulation branch point 37. The opening degree of the desorption gas supply valve 21 is controlled so that the pressure of the desorption gas 24 on the upstream side of the valve 38 becomes high. This control is for stably supplying the desorbed gas 24 for desorbing CO 2 while supplying the desorbed gas 24 after desorbing CO 2 to the compressor 14. As a result, automatic operation of CO 2 recovery by this system becomes possible.

FIG. 6 is a block diagram showing another example of the method for increasing the concentration of CO 2 in the desorbed gas in the CO 2 recovery power generation system according to this embodiment. FIG. 6 is a view showing only the periphery of the rotary regeneration type CO 2 absorption / desorption device 8, the desorption gas supply valve 21, and the compressor (CO 2 recovery device) 14 as in FIG. The rotary regeneration type CO 2 absorption / desorption device 8 shows only the CO 2 desorption side 13. 6, the same reference numerals as those in FIG. 5 denote the same or common elements as those in FIG.

In the example shown in FIG. 6, in the CO 2 recovery type power generation system shown in FIG. 5, a heater 27 that heats the desorption gas 24 is provided upstream of the rotary regeneration type CO 2 absorption / desorption device 8. It is desirable to install the heater 27 downstream from the circulation junction 38. Further, a temperature measuring device 34 is provided between the rotary regeneration type CO 2 absorption / desorption device 8 and the heater 27. The temperature measuring device 34 is preferably provided immediately before the CO 2 desorption side 13.

The temperature measuring device 34 measures the temperature of the desorption gas 24 and outputs it to the CO 2 desorption control device 35. The CO 2 desorption control device 35 receives the output signal of the temperature measuring device 34, sends the output signal to the heater 27, and controls the output of the heater 27 according to the temperature of the desorbed gas 24. Specifically, the output of the heater 27 is controlled so that the temperature of the desorption gas 24 is equal to or higher than the desorption temperature of CO 2 . The CO 2 desorption temperature of the desorption gas 24 varies depending on the type of the CO 2 absorbent. By this control, the temperature of the desorbed gas 24 can be raised even if it is lowered during the circulation process. As a result, automatic operation of CO 2 recovery by this system becomes possible.

In the example shown in FIGS. 5 and 6, the desorption gas control valve 29, the desorption gas circulation fan 26, the desorption gas supply valve 21, and the heater 27 are provided as a single CO 2 desorption control. Although controlled by the device 35, these devices may be individually controlled by a plurality of control devices.

DESCRIPTION OF SYMBOLS 1 ... Boiler, 2 ... Denitration device, 3 ... Air heating heat exchanger, 4 ... Heat recovery heat exchanger, 5 ... Dry-type electrostatic precipitator, 6 ... Desulfurization device, 7 ... Wet electrostatic precipitator, 8 ... Rotation regeneration Type CO 2 absorption / desorption device, 9 ... reheat heat exchanger, 10 ... chimney, 11 ... dehydrator, 12 ... oxygen supply device, 13 ... CO 2 desorption side of rotary regeneration type CO 2 absorption / desorption device, 14 Compressor (CO 2 recovery device), 20 Air, 21 Desorbed gas supply valve, 22 Carbon dioxide (CO 2 ), 23 Non-condensable gas, 24 Desorbed gas, 25 Oxygen, 26 desorbed gas circulation fan, 27 ... heater, 28 ... air supply fan, 29 ... desorbed gas control valve, 30 ... CO 2 concentration measuring device, 31 ... downstream pressure measuring device, 32 ... upstream pressure measuring device, 34 ... temperature meter, 35 ... CO 2 desorption controller, 36 ... circulating gas, 37 ... circulation branch point, 38 ...循Confluence, 40 ... rotary member, 41 ... particles packed layer, 42 ... mesh, 43 ... honeycomb structure, 44, 45 ... vent pipe.

Claims (8)

  1. A boiler that burns coal;
    A denitration device that is installed downstream of the boiler and removes nitrogen oxides in the combustion exhaust gas of the boiler;
    A heat exchanger installed downstream of the denitration device and recovering heat of the combustion exhaust gas;
    A dust collector installed on the downstream side of the heat exchanger to remove the dust in the combustion exhaust gas;
    A desulfurizer installed downstream of the dust collector to remove sulfur oxides in the combustion exhaust gas; and
    A rotation regeneration type carbon dioxide absorption and desorption device installed downstream of the desulfurization device and holding a carbon dioxide absorbent,
    The rotation regeneration type carbon dioxide absorption and desorption device is,
    The combustion exhaust gas and a part of the air heated by the heat exchanger as desorption gas are vented,
    In the part where the flue gas passes, absorb carbon dioxide in the flue gas,
    The absorbed carbon dioxide is desorbed at a portion where the desorbed gas is vented.
    A carbon dioxide recovery type power generation system characterized by that.
  2. A boiler that burns coal,
    A heat recovery heat exchanger installed on the downstream side of the boiler and recovering the heat of combustion exhaust gas of the boiler;
    A dust collector installed on the downstream side of the heat recovery heat exchanger to remove the dust in the combustion exhaust gas;
    A desulfurizer installed downstream of the dust collector to remove sulfur oxides in the combustion exhaust gas; and
    A rotationally regenerative carbon dioxide absorption and desorption device installed downstream of the desulfurization device and holding a carbon dioxide absorbent;
    A reheating heat exchanger installed downstream of the rotary regeneration type carbon dioxide absorption and desorption device and reheating the combustion exhaust gas using heat recovered by the heat recovery heat exchanger;
    A denitration device that is installed downstream of the reheating heat exchanger and removes nitrogen oxides in the combustion exhaust gas;
    An air heating heat exchanger installed on the downstream side of the denitration device and recovering the heat of the combustion exhaust gas,
    The rotation regeneration type carbon dioxide absorption and desorption device is,
    The combustion exhaust gas and a part of the air heated by the air heating heat exchanger as desorption gas are passed through,
    In the part where the flue gas passes, absorb carbon dioxide in the flue gas,
    The absorbed carbon dioxide is desorbed at a portion where the desorbed gas is vented.
    A carbon dioxide recovery type power generation system characterized by that.
  3. In the carbon dioxide recovery type power generation system according to claim 1 or 2,
    The carbon dioxide absorbent is formed of mesoporous silica, and at least one element selected from the group consisting of Mg, Ca, Sr, Ba, Y, and La is supported on the mesoporous silica to generate carbon dioxide. system.
  4. In the carbon dioxide recovery type power generation system according to claim 1 or 2,
    The desorbed gas that has passed through the rotation regeneration type carbon dioxide absorption / desorption device is passed through a pipe from a circulation branch point on the downstream side of the rotation regeneration type carbon dioxide absorption / desorption device to a circulation junction point on the upstream side. A carbon dioxide recovery power generation system that circulates and again ventilates the rotation regeneration type carbon dioxide absorption and desorption device.
  5. In the carbon dioxide recovery type power generation system according to claim 4,
    An adjustment valve that is installed downstream of the circulation branch point and adjusts the flow rate of the desorption gas;
    A compressor installed downstream of the control valve and recovering carbon dioxide;
    A control device for controlling the regulating valve,
    The control device is a carbon dioxide recovery type power generation system that controls an opening degree of the control valve according to an output of the compressor.
  6. In the carbon dioxide recovery type power generation system according to claim 4 or 5,
    A desorption gas circulation fan installed in the middle of the pipe;
    A carbon dioxide concentration measuring device installed between the rotary regeneration type carbon dioxide absorption and desorption device and the circulation branch point;
    A control device for controlling the desorption gas circulation fan,
    The control device is a carbon dioxide recovery type power generation system that controls an output of the desorption gas circulation fan according to a concentration of carbon dioxide of the desorption gas measured by the carbon dioxide concentration measuring device.
  7. The carbon dioxide recovery type power generation system according to any one of claims 4 to 6,
    A downstream pressure measuring device installed downstream of the circulation branch point;
    An upstream pressure measuring device installed upstream of the circulation confluence;
    A supply valve that is installed on the upstream side of the upstream pressure measuring device and adjusts the flow rate of the desorbed gas;
    A control device for controlling the supply valve,
    The control device controls the opening degree of the supply valve so that the pressure of the desorbed gas is higher at the pressure measured by the upstream pressure measuring device than the pressure measured by the downstream pressure measuring device. Carbon dioxide recovery power generation system.
  8. In the carbon dioxide recovery type power generation system according to any one of claims 4 to 7,
    A heater that is installed on the upstream side of the rotary regeneration type carbon dioxide absorption and desorption device and that heats the desorption gas;
    A temperature measuring device installed between the rotary regeneration type carbon dioxide absorption and desorption device and the heater;
    A control device for controlling the heater,
    The control device is a carbon dioxide recovery type power generation system that controls the output of the heater according to the temperature of the desorbed gas measured by the temperature measuring device.
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US9028592B2 (en) * 2010-04-30 2015-05-12 Peter Eisenberger System and method for carbon dioxide capture and sequestration from relatively high concentration CO2 mixtures
AU2012307077B2 (en) * 2011-09-05 2017-07-20 Emission Logistics Pty Ltd Emission control system
CN102698585B (en) * 2012-06-29 2014-04-30 青岛碱业股份有限公司 Method for recyling carbon dioxide in boiler flue gas
CN102764577B (en) * 2012-07-05 2015-07-15 葫芦岛辉宏有色金属有限公司 Method for collecting carbon dioxide from industrial kiln smoke
CN104923011A (en) * 2015-07-01 2015-09-23 刘仲明 Capturing device and comprehensive utilization of fire coal exhaust gas
CN105817214B (en) * 2016-05-09 2019-02-19 武汉旭日华科技发展有限公司 A kind of concentration continuous type regneration of adsorbent material device and method
CN106801884A (en) * 2016-11-22 2017-06-06 浙江巨化热电有限公司 A kind of smoke comprehensive processing unit and its method

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JPH0691128A (en) * 1992-09-14 1994-04-05 Mitsubishi Heavy Ind Ltd Continuous gas separation and recovery device
JP2002011326A (en) * 2000-06-30 2002-01-15 Toshiba Corp Carbon dioxide recovering apparatus

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JPH0691128A (en) * 1992-09-14 1994-04-05 Mitsubishi Heavy Ind Ltd Continuous gas separation and recovery device
JP2002011326A (en) * 2000-06-30 2002-01-15 Toshiba Corp Carbon dioxide recovering apparatus

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