JP2005075683A - Carbon dioxide recovery unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a carbon dioxide recovery unit which recovers much carbon dioxide contained in combustion gas. <P>SOLUTION: This carbon dioxide recovery unit is set in a boiler itself 27, and comprises a carbon dioxide absorber 34 which accommodates an absorber which absorbs carbon dioxide from the combustion gas formed in a combustion room 18, a carbon dioxide discharging part 36 which is accommodated in a regenerator 35 which discharges the absorbed carbon dioxide by heating the absorber which absorbed the carbon dioxide, a carbon dioxide heater 33 which supplies a heating medium to the carbon dioxide discharging part 36 and is accommodated in the boiler itself 27, and a means 41 which returns the absorber which discharged carbon dioxide at the carbon dioxide discharging part 36 to the carbon dioxide absorber 34. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a carbon dioxide recovery device that effectively recovers carbon dioxide (CO ₂ ) contained in exhaust gas discharged from a combustion device such as a boiler.

  Conventionally, a combustion apparatus such as a heating furnace or a combustion furnace generates air by adding air to fuel, raises the temperature of the combustion chamber with the generated combustion gas, and then releases the exhaust gas to the atmosphere. For example, there is a boiler plant that is applied to a thermal power plant as one that discharges a large amount of exhaust gas to the atmosphere.

  As shown in FIG. 6, the boiler plant applied to this thermal power plant is composed of the combustion chamber 1, the radial first superheater 2, the second superheater 3, the first reheater in order along the flow of the combustion gas 16. A boiler body 8 that houses the heater 4, the third superheater 5, the second reheater 6, and the economizer 7, an air preheater 9 that is sequentially connected to the boiler body 8, a denitrator 10, and an electric dust collector 11, a desulfurizer 12 and a chimney 13, and a combustion gas 16 is generated by the fuel 14 supplied to the combustion chamber 1 and the air 15 supplied via the air preheater 9, and the generated temperature is about 1200 ° C. The inside of each of the radial first superheater 2, second superheater 3, first reheater 4, third superheater 5, second reheater 6, and economizer 7 by the heat of the combustion gas 16. Saturated water or saturated steam passing through is heated and superheated to form steam (superheated steam), etc., and saturated water etc. is converted to steam, etc. 350 Combustion gas 16 of about ˜400 ° C. is supplied to the air preheater 9, where the air 15 that generates the combustion gas 16 is preheated, and the combustion gas 16 preheated with the air 15 is sequentially removed from the denitration device 10 and the electric dust collector. 11. Supply to desulfurizer 12, remove nitrogen oxide (NOx) with desulfurizer 12, remove impurities such as fly ash with electrostatic precipitator 11, and remove sulfur oxide (SOx) with desulfurizer 12. The exhaust gas was discharged from the chimney 13 to the atmosphere as an exhaust gas having a temperature of 120 ° C to 150 ° C.

  In the boiler plant having such a configuration, since the exhaust gas emitted from the boiler body 8 is a large amount of several hundred tons per hour, carbon dioxide contained in the exhaust gas may cause global warming. For this reason, technological developments such as reduction and recovery of carbon dioxide emissions are being carried out in the field of boiler plants.

  Examples of methods for recovering carbon dioxide include chemical absorption methods, physical adsorption methods, and membrane separation methods.

  The chemical absorption method skillfully utilizes the properties of an amine absorbing solution that absorbs carbon dioxide at a temperature of 40 ° C. to 50 ° C. and releases it at a temperature of 100 ° C. to 120 ° C. The physical adsorption method uses the property of zeolite that adsorbs carbon dioxide when pressure is applied and desorbs when pressure is reduced. In the membrane separation method, carbon dioxide is subjected to membrane separation using a porous hollow fiber membrane.

  In the field of boiler plants, carbon dioxide is recovered by selecting and using the above methods.

For the recovery of carbon dioxide, for example, JP-A-5-26409 (Patent Document 1), JP-A-6-17667 (Patent Document 2), JP-A-8-155262 (Patent Document 3), Japanese Patent Laid-Open No. 2002-79052 (Patent Document 4) is disclosed.
Japanese Patent Laid-Open No. 5-26409 JP-A-6-17667 JP-A-8-155262 JP 2002-79052 A

  When using the carbon dioxide recovery method described above, each method has some problems.

  That is, the method using an amine absorbing liquid has been considered most promising because it has a high carbon dioxide absorption rate and can be operated at a low temperature, but the amine absorbing liquid itself is toxic and liquid, There were problems such as slight evaporation in the exhaust gas, causing pollution. For this reason, some measures were required.

  On the other hand, although the physical adsorption method of zeolite or the like depends on the material, the amount of carbon dioxide absorption is generally small, and a drastic improvement measure is required when a large amount of exhaust gas is treated like a boiler plant.

  In addition, since the membrane separation method uses a porous hollow fiber membrane, the cost is high, and the membrane separation method itself separates based on the size of the molecule, so that the size of nitrogen molecules and carbon dioxide molecules contained in the exhaust gas is increased. However, it was difficult to separate the two, and the purity of the recovered carbon dioxide was low.

  As described above, the carbon dioxide recovery methods that have been used conventionally include several problems, and the realization of a more effective recovery method has been demanded.

Recently, a technique for absorbing carbon dioxide using an absorbent containing particles of lithium silicate (Li ₄ SO ₄ ) has been proposed, and the results are expected.

The present invention skillfully utilizes the attributes of lithium silicate (Li ₄ SO ₄ ), and is made into an absorbent material in which lithium silicate is contained in particles to form a pellet, and a larger amount of carbon dioxide is produced using this absorbent material. It aims at providing the carbon dioxide recovery device which absorbs and collects.

As a result of intensive research on the recovery of carbon dioxide, the present inventor made a pellet-like solid absorbent containing lithium silicate (Li ₄ SO ₄ ), which is a lithium composite oxide (compound). If it reaches, the carbon dioxide is selectively absorbed at the absorption temperature, and the carbon dioxide is regenerated (released) at a temperature higher than the absorption temperature (regeneration temperature), and more than 400 times its own volume. It was found that carbon dioxide can be absorbed.

  The absorption temperature of the lithium composite oxide is about 550 ° C. to about 650 ° C. at atmospheric pressure, and the regeneration temperature is about 750 ° C. to about 850 ° C. near atmospheric pressure.

  The inventor has paid attention to the fact that the lithium compound absorbs a large amount of carbon dioxide, and has completed the invention by repeating trial and error.

  That is, in order to achieve the above-mentioned object, the carbon dioxide recovery device according to the present invention is installed in the boiler body and is carbon dioxide among the combustion gases generated from the combustion chamber as described in claim 1. A carbon dioxide absorber that contains an absorbent that absorbs carbon dioxide, a carbon dioxide release section that is housed in a regenerator that heats the absorbent that has absorbed carbon dioxide and releases the absorbed carbon dioxide, and a carbon dioxide release section A carbon dioxide heater accommodated in the boiler body for supplying a heating medium, and a means for returning the absorbent material from which carbon dioxide has been released by the carbon dioxide releasing section to the carbon dioxide absorber.

  Further, in order to achieve the above-mentioned object, the carbon dioxide recovery device according to the present invention is configured such that the carbon dioxide absorber has a combustion gas temperature in a range of 350 ° C. to 650 ° C. Installed in the boiler body.

  Moreover, in order to achieve the above-mentioned object, the carbon dioxide recovery device according to the present invention includes a desulfurizer and a second reheat which are accommodated in the boiler body, as described in claim 3. It is installed between the containers.

  Moreover, in order to achieve the above-mentioned object, the carbon dioxide recovery device according to the present invention includes an electric dust collector and a desulfurizer accommodated in a boiler body, as described in claim 4. Of these, one is installed on the downstream side.

  In order to achieve the above-described object, the carbon dioxide recovery device according to the present invention includes a belt conveyor driven by a rotor and a belt conveyor driven by a rotor. It is comprised with the cylinder to install.

  Moreover, in order to achieve the above-mentioned object, the carbon dioxide recovery device according to the present invention is any one of a wire mesh and a perforated plate having an open head as described in claim 6. Is selected and configured.

  Further, in order to achieve the above-mentioned object, the carbon dioxide recovery device according to the present invention circulates carbon dioxide through the carbon dioxide discharge part of the regenerator as described in claim 7. The first carbon dioxide circulation system is provided, and a moving force is applied to the absorbent supplied to the carbon dioxide discharge portion of the regenerator by the carbon dioxide circulating in the first carbon dioxide circulation system.

  Moreover, in order to achieve the above-mentioned object, the carbon dioxide recovery device according to the present invention has a nitrogen circulation in which the carbon dioxide absorber circulates nitrogen through the cooler of the regenerator. And a moving force is applied to the absorbent that returns from the carbon dioxide releasing portion of the regenerator by the nitrogen circulating in the nitrogen circulation system.

  Moreover, in order to achieve the above-mentioned object, the carbon dioxide recovery device according to the present invention is configured in a pellet form in which lithium silicate is contained in particles as described in claim 9. .

  Further, in order to achieve the above-mentioned object, the carbon dioxide recovery device according to the present invention provides a carbon dioxide heater to a boiler body in a region where the combustion gas temperature is 800 ° C. or higher. It is installed.

  In order to achieve the above object, the carbon dioxide recovery device according to the present invention includes a second superheater housed in the boiler body and a first reheater as described in claim 11. It is installed between the heaters.

  Further, in order to achieve the above-mentioned object, the carbon dioxide recovery device according to the present invention is the second device in which the carbon dioxide heater circulates the heating carbon dioxide through the regenerator as described in claim 12. It has a carbon dioxide circulation system.

  Moreover, in order to achieve the above-mentioned object, the carbon dioxide recovery device according to the present invention is configured such that the carbon dioxide release portion is configured as a bowl-shaped cylinder, and an inlet of the cylinder is provided. A carbon dioxide extraction pipe for extracting carbon dioxide provided on the side, a passage provided in the middle for flowing a high-temperature heating medium, and a net portion provided facing the passage and supported by a support grid It is.

  Moreover, in order to achieve the above-mentioned object, the carbon dioxide recovery device according to the present invention is provided with a mesh part at each of the entrance and the exit of the passage as described in claim 14.

  Further, in order to achieve the above-mentioned object, the carbon dioxide recovery device according to the present invention is provided on the downstream side of the carbon dioxide emission unit as described in claim 15, and the carbon dioxide emission unit. It is provided with a cooler that cools carbon dioxide released from the absorbent housed in the container.

  In the carbon dioxide recovery device according to the present invention, a carbon dioxide absorber that accommodates an absorbent in a region of 350 ° C. to 650 ° C. is installed in the boiler body, and the carbon dioxide absorber is installed in a regenerator installed separately from the boiler body. The carbon discharge part is accommodated, the absorbent that has absorbed carbon dioxide is moved to the carbon dioxide release part by the carbon dioxide absorber, and the carbon dioxide is supplied by the heat source from the carbon dioxide heater provided in the boiler body. The discharge part is heated to a temperature of 650 ° C to 750 ° C, and the carbon dioxide that has been absorbed by the absorbent material is released so that the carbon dioxide contained in the exhaust gas can be processed and recovered in large quantities without waste. can do.

  Hereinafter, embodiments of a carbon dioxide recovery device according to the present invention will be described with reference to the drawings and the reference numerals attached to the drawings.

  FIG. 1 is a schematic system diagram showing a first embodiment in which a carbon dioxide recovery device according to the present invention is applied to a boiler plant incorporated in a thermal power plant as an example.

  The boiler plant incorporated in the thermal power plant includes a combustion chamber 18, a radial first superheater 19, a second superheater 20, a first reheater 21, and a third superheater in order along the flow of the combustion gas 17. 22, an electric dust collector 23, a desulfurizer 24, a second reheater 25, a boiler main body 27 that houses a economizer 26, an air preheater 28 that is successively connected to the boiler main body 27, a denitrator 29, and a chimney 30 The combustion gas 17 is generated by the fuel 31 such as coal supplied to the combustion chamber 18 and the air 32 supplied via the air preheater 28, and the generated heat of the combustion gas 17 having a temperature of about 1200 ° C. Saturated water or saturation passing through each of the radial first superheater 19, second superheater 20, first reheater 21, third superheater 22, second reheater 25, and economizer 26. Steam is heated and superheated to form steam (superheated steam), etc. Further, impurities such as fly ash contained in the combustion gas 17 are removed by the electric dust collector 23, and sulfur oxides (SOx) are removed by the desulfurizer 24, while the temperature from the economizer 26 is 350 ° C. to 400 ° C. The combustion gas 17 at 0 ° C. is supplied to the air preheater 28, the air 32 for generating the combustion gas 17 is preheated by the air preheater 28, and the combustion gas 17 preheated with air is supplied to the denitrifier 29, where nitrogen After the oxide (NOx) is removed, it is discharged from the chimney 30 to the atmosphere as exhaust gas having a temperature of 120 ° C. to 150 ° C.

  In the boiler plant applied to the thermal power plant having such a configuration, the present embodiment is a region where the temperature of the combustion gas 17 in the boiler body 27 is 800 ° C. or higher, for example, the second superheater 20 and the first reheater 21. And a carbon dioxide heater 33 installed between and a region where the temperature of the combustion gas 17 is about 350 ° C. to 650 ° C., for example, between the electrostatic precipitator 23 or the desulfurizer 24 and the second reheater 25. A carbon dioxide absorber 34 is provided.

  Both the carbon dioxide heater 33 and the carbon dioxide absorber 34 are connected to a regenerator 35 installed separately from the boiler body 27.

  The regenerator 35 is formed of, for example, a cylindrical body, and a carbon dioxide release unit 36 that releases carbon dioxide supplied from the carbon dioxide absorber 34 and absorbed by the absorbent material at a high temperature into the body, and the carbon dioxide. A cooler 37 for cooling the carbon dioxide released from the discharge unit 36 is accommodated.

  Further, the carbon dioxide absorber 34 has a nitrogen circulation system 41 interposing a nitrogen tank 39 provided with another cooler 38 in the middle and a nitrogen blower 40 for transportation between the cooler 37 of the regenerator 35. I have. The nitrogen circulation system 41 seals the surface of the absorbent with the circulating nitrogen when returning the absorbent that has released carbon dioxide from the carbon dioxide release section 36 of the regenerator 35 to the carbon dioxide absorber 34, and other carbon dioxide. And a pressing force (moving force) is applied so that the absorbent can smoothly return to the carbon dioxide absorber 34.

  Further, the carbon dioxide releasing part 36 in the regenerator 35 includes a first carbon dioxide circulation system 45 interposing a carbon dioxide tank 44 provided with a transfer carbon dioxide blower 42 and a cooler 43 in the middle. The first carbon dioxide circulation system 45 is supplied from the carbon dioxide tank 44 when moving the absorbent that has absorbed carbon dioxide by the carbon dioxide absorber 34 provided in the boiler body 27 to the carbon dioxide discharge section 36 of the regenerator 35. Carbon dioxide is given to the absorbent so that the absorbent can move smoothly.

  In addition, the regenerator 35 releases carbon dioxide from the absorbent material by the carbon dioxide release section 36, and a part of the carbon dioxide cooled by the cooler 37 is transferred to the carbon dioxide heater 33 of the boiler body 27 through the blower 46. A second carbon dioxide circulation system 47 is provided for supplying the heated and heated carbon dioxide to the carbon dioxide releasing section 36 as a heating source.

  Next, the operation of the carbon dioxide recovery device according to this embodiment will be described.

  The combustion gas 17 generated in the combustion chamber 18 of the boiler body 27 heats the carbon dioxide heater 33 at a temperature of 800 ° C. or higher, and the heating carbon dioxide supplied from the regenerator 35 via the blower 46 has a temperature of 750 ° C. The carbon dioxide for heating heated to 850 ° C. is heated as a heating source to the carbon dioxide discharge part 36 of the regenerator 35 through the second carbon dioxide circulation system 47. Carbon dioxide absorbed by the absorbent material is released.

On the other hand, the combustion gas 17 exiting the carbon dioxide heater 33 is made to remove impurities such as fly ash by the electric dust collector 23 and sulfur oxide (SOx) by the desulfurizer 24, and then the carbon dioxide absorber. 34 is supplied at a temperature in the range of 350 ° C. to 500 ° C., and carbon dioxide is absorbed by an absorbent formed by pelletizing particles containing lithium silicate (Li ₄ SO ₄ ).

  The absorbent that has absorbed the carbon dioxide is moved and supplied to the carbon dioxide discharge section 36 of the regenerator 35 with the help of carbon dioxide from the carbon dioxide pro for transportation 42 in the first carbon dioxide circulation system 45. (2) High-temperature carbon dioxide having a temperature of 800 ° C. or more is given as a heating source from the carbon dioxide circulation system 47, and the absorbed carbon dioxide is released at that time.

  The regeneration carbon dioxide released from the absorbent by the carbon dioxide release part 36 is cooled by the cooler 38 in the nitrogen circulation system 41, and the nitrogen supplied from the nitrogen tank 39 through the transfer nitrogen blower 40 is used as a refrigerant source. It cools with the cooler 37.

  When the carbon dioxide for regeneration cooled by the cooler 37 is excessive, it is adjusted by the blower 52 and supplied to other devices. The remaining carbon dioxide for regeneration is supplied to a carbon dioxide heater 33 that is maintained at a constant amount and is accommodated in the boiler body 27.

  Further, the nitrogen used as the refrigerant in the cooler 37 is absorbed into the carbon dioxide absorber 34 through the nitrogen circulation system 41, and the carbon dioxide is released at the carbon dioxide release unit 36 and returned to the carbon dioxide absorber 34. While sealing the surface of the material, it is used as a moving acceleration force of the absorbent material.

As described above, in the present embodiment, the carbon dioxide heater 33 is accommodated in the high temperature portion of the boiler body 27, and the carbon dioxide absorber 34 is accommodated in the relatively low temperature portion of the boiler body 27. Each of the carbon absorbers 34 is connected to a regenerator 35 installed separately from the boiler body 27 via the second carbon dioxide circulation system 47, the first carbon dioxide circulation system 45, and the nitrogen circulation system 41, respectively. Also in the carbon absorber 34, carbon dioxide contained in the combustion gas is absorbed by an absorbent material configured in pellets containing lithium silicate (Li ₄ SO ₄ ) in the particles, and the absorbent material that has absorbed the carbon dioxide is used as the regenerator 35. The carbon dioxide emission part 36 of the carbon dioxide is heated by using carbon dioxide from the carbon dioxide heater 33 as a heating source, and the carbon dioxide absorbed at that time is released. Since the absorbent that has released the gas is returned to the carbon dioxide absorber 34 to absorb carbon dioxide, carbon dioxide can be processed and recovered in a larger amount without waste.

  Drawing 3 is a key map showing an embodiment of a carbon dioxide absorber built in a boiler body.

  The carbon dioxide absorber 34 is a region of the boiler body 27 in the temperature range of 350 ° C. to 650 ° C., for example, a flow between the electrostatic precipitator 23 or the desulfurizer 24 and the second reheater 25 shown in FIG. One of a belt conveyor 50 that is installed as a moving floor across the road 48 and is driven to rotate by a rotor 49, and a perforated plate that is fixed to the belt conveyor 50 and has a fine mesh wire and fine holes. In addition to selecting one of them, the head is opened, and a cylindrical body 51 containing an absorbent material formed in a pellet containing lithium is contained.

  In the carbon dioxide absorber 34 having such a configuration, the absorbent that has released the carbon dioxide supplied to the carbon dioxide release part 36 of the regenerator 35 together with nitrogen from the nitrogen circulation system 41 shown in FIG. 53, the belt conveyor 50 is sequentially inserted into the cylinder 51 fixed to the belt conveyor 50, and is included in the combustion gas 17 while the belt conveyor 50 driven by the rotor 49 moves across the flow path 48 of the boiler body 27. Absorbs carbon dioxide.

  The absorbent that has absorbed the carbon dioxide is released at the outlet 54, and together with the carbon dioxide supplied from the carbon dioxide tank 44 via the first carbon dioxide circulation system 47 shown in FIG. The carbon dioxide absorbed here is released under high temperature.

  As described above, in this embodiment, the absorbent material is accommodated in the cylinder 51 fixed to the belt conveyor 50 as the moving floor, and the absorbent material accommodated in the cylinder 51 crosses the flow path 48 of the boiler body 27. Since carbon dioxide contained in the combustion gas 17 is absorbed one after another when passing, a larger amount of carbon dioxide can be absorbed by the absorbent.

  FIG. 4 and FIG. 5 are conceptual diagrams showing an embodiment of a carbon dioxide releasing part in a regenerator connected to a carbon dioxide absorber housed in a boiler body.

  4 is a front view of the carbon dioxide releasing part, and FIG. 5 is a side sectional view of the carbon dioxide releasing part as seen from the direction of arrows AA in FIG.

  The carbon dioxide release part 36 is configured as, for example, a rigid cylindrical body 55, and is interposed between the inlet 56 and the outlet 57 via the second carbon dioxide circulation system 47 from the carbon dioxide heater 33 shown in FIG. A path 58 through which heated carbon dioxide heated to a temperature of 800 or higher flows, a mesh section 60 that intersects the path 58 and supported by the support grid 59, and the inlet 56 side is supplied together with the absorbent. A carbon dioxide extraction pipe 61 for extracting the heated carbon dioxide and returning it to the first carbon dioxide system 45 shown in FIG. 1 is provided.

  Moreover, the mesh part 60, for example, a fine metal mesh, is provided on each of the inlet side and the outlet side of the passage 58 so as to prevent the foreign matter contained in the heating carbon dioxide from flowing in.

  In the carbon dioxide releasing part 36 having such a configuration, the absorbent supplied to the inlet 56 of the carbon dioxide releasing part 36 from the carbon dioxide absorber 34 shown in FIG. When the heating carbon dioxide flows down toward the outlet 54 side of the cylindrical body 55 and settles, the heating carbon dioxide is extracted to the first carbon dioxide circulation system 45 through the carbon dioxide extraction pipe 61.

  When the remaining absorbent reaches the passage 58 provided in the middle of the cylinder 55, the absorbent for heating supplied from the carbon dioxide heater 33 shown in FIG. 1 through the second carbon dioxide circulation system 47 and the mesh part 60. Heated using carbon dioxide as a heating source. The heated absorbent releases the carbon dioxide it has absorbed. Then, the carbon dioxide released from the absorbent is supplied to the cooler 37 shown in FIG. 1 together with the heating carbon dioxide. Further, the absorbent that has released carbon dioxide is returned from the outlet 57 to the carbon dioxide absorber 34 through the nitrogen circulation system 41 shown in FIG.

  As described above, in the present embodiment, the absorbent that has absorbed carbon dioxide by the carbon dioxide absorber 34 of the boiler body 27 is supplied to the carbon dioxide release part 36 of the regenerator 35, where it is absorbed at a high temperature. Since it is configured to release carbon, a larger amount of carbon dioxide can be processed.

  FIG. 2 is a system diagram showing a second embodiment of the carbon dioxide recovery device according to the present invention.

  In addition, the same code | symbol is attached | subjected to the same component as the component shown in FIG.

  In the carbon dioxide recovery device according to the present embodiment, the absorbent heated by the carbon dioxide release part 36 of the regenerator 35 in a temperature range of 800 ° C. or lower, to a temperature of 350 ° C. to 650 ° C. having the highest carbon dioxide absorption capability. In order to reduce the temperature, the first superheater 19, the second superheater 20, the carbon dioxide heater 33, the first reheater 31, and the third superheater accommodated in order along the flow of the combustion gas 17 in the boiler body 27. Among the unit 22, the second reheater 25, the economizer 26, the electrostatic precipitator 23, and the desulfurizer 24, a carbon dioxide absorber 34 is installed on the downstream side of the desulfurizer 24.

  The other constituent elements are the same as those shown in FIG.

  As described above, in the present embodiment, when the absorbent material that has been heated by the carbon dioxide release unit 36 of the regenerator 35 is returned to the carbon dioxide absorber 34, the absorbent material has a temperature range that absorbs the largest amount of carbon dioxide. As described above, since the carbon dioxide absorber 34 is installed on the downstream side of the electrostatic precipitator 23 and the desulfurizer 24, only carbon dioxide is absorbed without absorbing fly ash and sulfur oxide (SOx) contained in the combustion gas 17. Can absorb more.

1 is a schematic system diagram showing a first embodiment of a carbon dioxide recovery device according to the present invention. The schematic system diagram which shows 2nd Embodiment of the carbon dioxide recovery apparatus which concerns on this invention. The conceptual diagram which shows embodiment of the carbon dioxide absorber incorporated in the boiler applied to the carbon dioxide recovery apparatus which concerns on this invention. The conceptual diagram which shows embodiment of a carbon dioxide discharge | release part among the reproduction | regeneration apparatuses connected to the carbon dioxide absorber incorporated in the boiler applied to the carbon dioxide recovery apparatus which concerns on this invention. The sectional side view of the carbon dioxide emission part seen from the AA arrow direction of FIG. The schematic system diagram which shows the conventional boiler.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Combustion chamber 2 1st superheater 3 2nd superheater 4 1st reheater 5 3rd superheater 6 2nd reheater 7 Carbon-saving device 8 Boiler main body 9 Air preheater 10 Denitrator 11 Electric dust collector 12 Desulfurizer 13 Chimney 14 Fuel 15 Air 16, 17 Combustion gas 18 Combustion chamber 19 First superheater 20 Second superheater 21 First reheater 22 Third superheater 23 Electric dust collector 24 Desulfurizer 25 Second reheat Unit 26 Carbon-saving unit 27 Boiler main body 28 Air preheater 29 Denitration unit 30 Chimney 31 Fuel 32 Air 33 Carbon dioxide heater 34 Carbon dioxide absorber 35 Regeneration device 36 Carbon dioxide discharge part 37, 38 Cooler 39 Nitrogen tank 40 For transportation Nitrogen blower 41 Nitrogen circulation system 42 Carbon dioxide blower for conveyance 43 Cooler 44 Carbon dioxide tank 45 First carbon dioxide circulation system 46 Blower 47 Second carbon dioxide circulation system 48 Channel 49 Rotor 50 Beltcon A 51 cylindrical body 52 blower 53 inlet 54 outlet 55 cylinder body 56 inlet 57 outlet 58 passage 59 support grid 60 mesh part 61 carbon withdrawing pipe

Claims (15)

Of the combustion gas generated in the boiler body and generated from the combustion chamber, the carbon dioxide absorber that houses the absorbent that absorbs carbon dioxide and the absorbent that absorbs carbon dioxide are heated to absorb the absorbed carbon dioxide. A carbon dioxide release part housed in a regenerator to be released, a carbon dioxide heater housed in the boiler body that supplies a heating medium to the carbon dioxide release part, and an absorption in which carbon dioxide is released by the carbon dioxide release part And a means for returning the material to the carbon dioxide absorber. The carbon dioxide absorber according to claim 1, wherein the carbon dioxide absorber is installed in a boiler body in a region where the combustion gas temperature is in the range of 350C to 650C. The carbon dioxide absorber according to claim 1, wherein the carbon dioxide absorber is installed between a desulfurizer and a second reheater accommodated in the boiler body. 2. The carbon dioxide recovery device according to claim 1, wherein the carbon dioxide absorber is installed on the downstream side of one of the electrostatic precipitator and the desulfurizer accommodated in the boiler body. 2. The carbon dioxide recovery apparatus according to claim 1, wherein the carbon dioxide absorber comprises a belt conveyor driven by a rotor and a cylindrical body fixed to the belt conveyor. 6. The carbon dioxide recovery apparatus according to claim 5, wherein the cylindrical body is configured by selecting one of a wire mesh having a head open and a perforated plate. The carbon dioxide absorber includes a first carbon dioxide circulation system that circulates carbon dioxide through a carbon dioxide emission part of the regenerator, and the carbon dioxide released from the regenerator by the carbon dioxide that circulates through the first carbon dioxide circulatory system. The carbon dioxide recovery apparatus according to claim 1, wherein a moving force is applied to the absorbent supplied to the section. The carbon dioxide absorber includes a nitrogen circulation system that circulates nitrogen through the cooler of the regenerator, and applies a moving force to the absorbent that returns from the carbon dioxide discharge portion of the regenerator by the nitrogen that circulates through the nitrogen circulation system. The carbon dioxide recovery device according to claim 1, wherein the carbon dioxide recovery device is configured. 9. The carbon dioxide recovery apparatus according to claim 1, 7 or 8, wherein the absorbent material is configured in a pellet form in which lithium silicate is contained in particles. The carbon dioxide recovery device according to claim 1, wherein the carbon dioxide heater is installed in a boiler body in a region where the combustion gas temperature is 800 ° C or higher. The carbon dioxide recovery device according to claim 1, wherein the carbon dioxide heater is installed between a second superheater and a first reheater housed in the boiler body. The carbon dioxide recovery apparatus according to claim 1, wherein the carbon dioxide heater includes a second carbon dioxide circulation system for circulating the heating carbon dioxide through the regenerator. The carbon dioxide releasing part is configured as a bowl-shaped cylinder, a carbon dioxide extraction pipe for extracting carbon dioxide provided on the inlet side of the cylinder, a passage provided in the middle for flowing a high-temperature heating medium, The carbon dioxide recovery apparatus according to claim 1, further comprising: a net portion provided facing the passage and supported by a support grid. The carbon dioxide recovery apparatus according to claim 13, wherein the net part is provided at each of an inlet and an outlet of the passage. The regenerator is provided with a cooler that is provided on the downstream side of the carbon dioxide emission part and cools the carbon dioxide emitted from the absorbent accommodated in the carbon dioxide emission part. Carbon dioxide recovery device.

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