CN114522533B - System and method for capturing carbon dioxide in circulating flue gas of calcium-based heat carrier - Google Patents
System and method for capturing carbon dioxide in circulating flue gas of calcium-based heat carrier Download PDFInfo
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- CN114522533B CN114522533B CN202210224040.9A CN202210224040A CN114522533B CN 114522533 B CN114522533 B CN 114522533B CN 202210224040 A CN202210224040 A CN 202210224040A CN 114522533 B CN114522533 B CN 114522533B
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- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
- B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
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- B01D53/96—Regeneration, reactivation or recycling of reactants
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Abstract
A calcium-based heat carrier circulating flue gas carbon dioxide trapping system and a method relate to a calcium-based heat carrier circulating flue gas carbon dioxide trapping system. In order to solve the problem that the prior art lacks the capability of recycling high-concentration carbon dioxide for multiple times. The novel complete and reliable carbon dioxide trapping system is formed by coupling and connecting equipment in series by arranging a mixed heater, a cyclone separation heater, a mixed calcination reactor, a temperature regulator, a cyclone separation carbonizer, a carbon dioxide cooler, a first calcium-based compound distributor and a limestone supplementing system, and finally achieves the purposes of trapping carbon dioxide in the flue gas with high efficiency, low cost and high concentration under the conditions that an external heat source is not needed for calcination reaction, the output of a boiler is not influenced, and the calcium-based compound is recycled for many times. It is used for capturing carbon dioxide in flue gas.
Description
Technical Field
The invention relates to a carbon dioxide trapping system and a method, in particular to a calcium-based heat carrier circulating flue gas carbon dioxide trapping system.
Background
Carbon dioxide produced in the production processes of thermal power plants, cement, paper making, industrial boilers and kilns in the total carbon dioxide emission amount accounts for a large proportion, carbon dioxide is a main greenhouse gas causing greenhouse effect, and capturing carbon dioxide produced in the production processes of the industries with low cost, high efficiency and high concentration has a profound effect on realizing double carbon targets in China, so that effective means are required for capturing carbon dioxide.
Disclosure of Invention
The invention aims to solve the problem that the existing system lacks the capability of recycling high-concentration carbon dioxide for multiple times, and provides a system and a method for capturing carbon dioxide in circulating flue gas of a calcium-based heat carrier.
The system comprises a two-phase mixing heater H1, a cyclone separation heater H2, a mixing calcination reactor H3, a temperature regulator, a cyclone separation carbonizer H6, a carbon dioxide cooler H7, a first calcium-based compound distributor S1, a limestone supplementing system G1 and a carbon dioxide storage tank G2 for the circulating flue gas and carbon dioxide of the calcium-based heat carrier,
a limestone replenishment system G1 connected to the mixing calcination reactor H3 for storing the calcium-based compound and supplying the calcium-based compound to the mixing calcination reactor H3;
a first calcium-based compound distributor S1, which is connected with the mixed calcination reactor H3, the two-phase mixed heater H1 of the flue gas and the calcium-based compound heat carrier and the temperature regulator, and is used for distributing the calcium-based compound output by the mixed calcination reactor H3 to the two-phase mixed heater H1 of the flue gas and the calcium-based compound heat carrier and the temperature regulator at the same time, and controlling the content of the calcium-based compound distributed to each of the two-phase mixed heater H1 of the flue gas and the calcium-based compound heat carrier and the temperature regulator;
the flue gas and calcium-based compound heat carrier two-phase mixing heater H1 is connected with the cyclone separation heater H2 and the high-temperature flue gas generating device B1 and is used for receiving the carbon dioxide-containing high-temperature flue gas emitted by the high-temperature flue gas generating device B1, mixing the carbon dioxide-containing high-temperature flue gas with the entering calcium-based compound to obtain a high-temperature mixture, and entering the cyclone separation heater H2;
the cyclone separation heater H2 is connected with the mixing and calcining reactor H3 and the temperature regulator and is used for heating and separating the entered high-temperature mixture to obtain flue gas and a calcium-based compound heat carrier, wherein the flue gas enters the temperature regulator, and the calcium-based compound heat carrier enters the mixing and calcining reactor H3;
the temperature regulator is connected with the cyclone separation carbonizer H6 and is used for cooling the received flue gas, the calcium-based compound output by the first calcium-based compound distributor S1 is used for adsorbing carbon dioxide in the cooled flue gas, and the product is output to the cyclone separation carbonizer H6;
the cyclone separation carbonizer H6 is connected with the high-temperature flue gas generating device B1 and the mixed calcination reactor H3 and is used for separating the products into flue gas, calcium carbonate and calcium sulfate, outputting the separated flue gas to the high-temperature flue gas generating device B1 and outputting the separated calcium carbonate and calcium sulfate to the mixed calcination reactor H3;
a mixed calcination reactor H3 connected with the carbon dioxide cooler H7 and used for heating and calcining the calcium carbonate and the calcium sulfate by using the entering calcium-based compound heat carrier, and the generated carbon dioxide enters the carbon dioxide cooler H7;
and the carbon dioxide cooler H7 is connected with the carbon dioxide storage tank G2 and is used for cooling the entering carbon dioxide, and the cooled carbon dioxide enters the carbon dioxide storage tank G2 for storage.
Preferably, the system further comprises a calcium-based compound dispenser S2,
the second calcium-based compound distributor S2 is connected between the first calcium-based compound distributor S1 and the flue gas and calcium-based compound heat carrier two-phase mixed heater H1, and the second calcium-based compound distributor S2 is used for distributing the calcium-based compound distributed by the first calcium-based compound distributor S1 to the flue gas and calcium-based compound heat carrier two-phase mixed heater H1 and the temperature regulator again;
and the temperature regulator is used for cooling the received flue gas, absorbing carbon dioxide in the cooled flue gas by using the calcium-based compound output by the first calcium-based compound distributor S1 and the calcium-based compound output by the second calcium-based compound distributor S2, and outputting the resultant to the cyclone separation carbonizer H6.
Preferably, the system further comprises a carbon dioxide recycle blower F3,
and the carbon dioxide circulating fan F3 is used for receiving carbon dioxide from an outlet of the induced draft fan F2 and blowing the carbon dioxide into the mixed calcination reactor H3, so that the calcium-based compound heat carrier, the calcium carbonate and the calcium sulfate in the mixed calcination reactor H3 are heated and calcined more completely.
The beneficial effects of the invention are as follows:
according to the method, a calcium-based compound (such as Cao) is used as a heat carrier circulation working medium and a carbon dioxide adsorbent, high-temperature flue gas (such as high-temperature flue gas of a power station boiler, a flue gas generator and the like, the flue gas temperature is generally higher than 850 ℃) is used as an object for adsorbing carbon dioxide and a heat source, devices such as a corresponding heat exchanger, a separation heater, a flue gas carbon dioxide adsorber and a calcination reactor are arranged, related devices are coupled in series by adopting a mature technology, a novel complete and reliable carbon dioxide trapping system is formed, and finally the purposes of trapping carbon dioxide in the flue gas and recycling the heat carrier under the conditions that an external heat source is not needed for calcination reaction, the boiler output is not influenced, and the calcium-based compound is recycled for many times are achieved. Effectively reduces the trapping cost of the carbon dioxide in the high-temperature flue gas generated in the industrial production process.
The method fully exerts the characteristics of the calcium-based compound, namely, the calcium-based compound is used as a carbon dioxide adsorbent and also is used as a heat carrier, so that the system arrangement is simplified, the types of materials of the system are reduced, and the investment cost and the operation cost are reduced;
the system can be fully coupled with systems such as power plants, cement, papermaking, industrial boilers, kilns and the like, and the output of the system is not influenced;
the carbon dioxide trapped by the method is high in concentration, and is favorable for the utilization of downstream links.
Drawings
FIG. 1 is a flow chart of a calcium-based heat carrier circulating flue gas carbon dioxide capture system according to one embodiment;
fig. 2 is a flow chart of a calcium-based heat carrier circulating flue gas carbon dioxide capturing system according to a second embodiment.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention is further described below with reference to the drawings and specific examples, which are not intended to be limiting.
The first embodiment is as follows: the calcium-based heat carrier circulating flue gas carbon dioxide capturing system according to the present embodiment is described with reference to fig. 1, and includes a flue gas and calcium-based compound heat carrier two-phase mixing heater H1, a cyclone heater H2, a mixing calcination reactor H3, a temperature regulator, a cyclone carbonizer H6, a carbon dioxide cooler H7, a first calcium-based compound distributor S1, a limestone replenishment system G1, and a carbon dioxide storage tank G2,
a limestone replenishment system G1 connected to the mixing calcination reactor H3 for storing the calcium-based compound and supplying the calcium-based compound to the mixing calcination reactor H3;
a first calcium-based compound distributor S1, which is connected with the mixed calcination reactor H3, the two-phase mixed heater H1 of the flue gas and the calcium-based compound heat carrier and the temperature regulator, and is used for distributing the calcium-based compound output by the mixed calcination reactor H3 to the two-phase mixed heater H1 of the flue gas and the calcium-based compound heat carrier and the temperature regulator at the same time, and controlling the content of the calcium-based compound distributed to each of the two-phase mixed heater H1 of the flue gas and the calcium-based compound heat carrier and the temperature regulator;
the flue gas and calcium-based compound heat carrier two-phase mixing heater H1 is connected with the cyclone separation heater H2 and the high-temperature flue gas generating device B1 and is used for receiving the carbon dioxide-containing high-temperature flue gas emitted by the high-temperature flue gas generating device B1, mixing the carbon dioxide-containing high-temperature flue gas with the entering calcium-based compound to obtain a high-temperature mixture, and entering the cyclone separation heater H2;
the cyclone separation heater H2 is connected with the mixing and calcining reactor H3 and the temperature regulator and is used for heating and separating the entered high-temperature mixture to obtain flue gas and a calcium-based compound heat carrier, wherein the flue gas enters the temperature regulator, and the calcium-based compound heat carrier enters the mixing and calcining reactor H3;
the temperature regulator is connected with the cyclone separation carbonizer H6 and is used for cooling the received flue gas, the calcium-based compound output by the first calcium-based compound distributor S1 is used for adsorbing carbon dioxide in the cooled flue gas, and the product is output to the cyclone separation carbonizer H6;
the cyclone separation carbonizer H6 is connected with the high-temperature flue gas generating device B1 and the mixed calcination reactor H3 and is used for separating the products into flue gas, calcium carbonate and calcium sulfate, outputting the separated flue gas to the high-temperature flue gas generating device B1 and outputting the separated calcium carbonate and calcium sulfate to the mixed calcination reactor H3;
a mixed calcination reactor H3 connected with the carbon dioxide cooler H7 and used for heating and calcining the calcium carbonate and the calcium sulfate by using the entering calcium-based compound heat carrier, and the generated carbon dioxide enters the carbon dioxide cooler H7;
and the carbon dioxide cooler H7 is connected with the carbon dioxide storage tank G2 and is used for cooling the entering carbon dioxide, and the cooled carbon dioxide enters the carbon dioxide storage tank G2 for storage.
In this embodiment, the high-temperature flue gas generating device B1 is a generating device capable of generating high-temperature flue gas containing carbon dioxide in actual production processes such as a power station boiler, an industrial boiler, a flue gas generator, various kilns and the like which are fired with coal, gas or fuel oil, and is used for generating high-temperature flue gas containing carbon dioxide, and the high-temperature flue gas entering the equipment H1 through the process 1 is used as a heat source for providing energy for a calcium-based compound heat carrier and a conveying medium of the process 2;
the two-phase mixing heater H1 of the flue gas and the calcium-based compound heat carrier has the functions of fully mixing the high-temperature flue gas passing through the process 1 with the low-temperature heat carrier passing through the processes 5 and 7 and heating the calcium-based compound heat carrier by utilizing the heat of the flue gas;
the cyclone separation heater H2 has the functions of heating and calcining the calcium carbonate entering the reactor through the flow 3 and entering the reactor through the flow 9 by utilizing the high-temperature calcium-based compound heat carrier, the calcium-based compound generated after the calcium carbonate is calcined enters the next heating cycle through the flow 4, the fluidization medium required by the H3 mixed calcination is high-purity carbon dioxide generated after the calcium carbonate is calcined, the resistance generated by feeding the H3 into the H3 through the flow 17-18 and the flow 17-18 is overcome by F3 (carbon dioxide circulating fan), and the advantage of adopting the calcined high-purity carbon dioxide as the fluidization medium in the H3 is that extra air and other working mediums are avoided to be brought into the system, and the trapped high-purity carbon dioxide can be recycled, so that the economy of the system can be effectively improved; in addition, considering that certain loss exists in the recycling process of the calcium-based compound, the system is provided with a limestone supplementing system, and G1 is supplemented into H3 through a flow path 20 when the system needs to supplement limestone;
the flue heat exchanger H4 has the function of exchanging heat between the high-temperature flue gas and the calcium-based compound mixture in the processes 6 and 19, so that the temperature of the flue gas reaches the optimal temperature range (generally 600-800 ℃) suitable for the calcium-based compound to adsorb carbon dioxide in the flue gas, and has a certain temperature regulating function. The flue heat exchanger H4 can adopt the working medium arranged inside to heat the working medium, so that the temperature inside the flue heat exchanger H4 is reduced, and the purpose of cooling the flue gas is achieved. The heated working medium in the heat exchanger can be cooperatively arranged with each level of heating surface arranged in B1, so that the economy of the whole plant is improved;
the flue carbon dioxide adsorber H5 has the following functions: providing sufficient reaction space for the calcium-based compound to fully adsorb carbon dioxide in the flue gas, wherein the flue gas temperature regulated by H4 is very suitable for the adsorption temperature interval of the calcium-based compound to the carbon dioxide in the flue gas, and in addition, in order to improve the adsorption rate of the carbon dioxide, equipment for supplementing the calcium-based compound by a process 12 is arranged in H5, so that the whole system has higher regulation characteristics, and fluidization wind required by fluidization in H5 is provided by F1 (fluidization fan) and is fed into H5 by a process 11;
the cyclone carbonizer H6 functions as: providing a reaction space for further carbonization of the flue gas entering the H6 through the flow 8 and calcium-based chemical combination, separating the flue gas from materials such as calcium carbonate and calcium sulfate, returning the separated flue gas to a tail flue in the B1 through the flow 10, and entering the materials such as calcium carbonate into the H9 through the flow 9 for calcination reaction;
the carbon dioxide cooler H7 is used for cooling high-purity carbon dioxide generated by the calcination reaction in H3 in H7 through a flow 13, enabling the cooled carbon dioxide to enter C1 (dust remover) through a flow 14, overcoming resistance generated by the flow 13-14-15-16 by F2 (induced draft fan), and finally driving the captured high-purity carbon dioxide into G2 (carbon dioxide storage tank) for storage for later use;
the calcium-based compound dispenser S1 acts to adjust the dispensing of the calcium-based compound from scheme 4 into S1 according to the end reaction requirements of schemes 5 and 12;
the calcium-based compound dispenser S2 acts to adjust the dispensing of the calcium-based compound from scheme 5 into S2 according to the end demand of schemes 7 (heat carrier) and 19 (adsorption reaction).
The second embodiment is as follows: the present embodiment is further limited to the calcium-based heat carrier circulating flue gas carbon dioxide capturing system according to the first embodiment, and further includes a second calcium-based compound dispenser S2,
the second calcium-based compound distributor S2 is connected between the first calcium-based compound distributor S1 and the flue gas and calcium-based compound heat carrier two-phase mixed heater H1, and the second calcium-based compound distributor S2 is used for distributing the calcium-based compound distributed by the first calcium-based compound distributor S1 to the flue gas and calcium-based compound heat carrier two-phase mixed heater H1 and the temperature regulator again;
and the temperature regulator is used for cooling the received flue gas, absorbing carbon dioxide in the cooled flue gas by using the calcium-based compound output by the first calcium-based compound distributor S1 and the calcium-based compound output by the second calcium-based compound distributor S2, and outputting the resultant to the cyclone separation carbonizer H6.
In this embodiment, the present application may also dispense the calcium-based compound into the temperature regulator and H1 via S2.
And a third specific embodiment: the present embodiment is further defined by the calcium-based heat carrier circulating flue gas carbon dioxide capturing system according to one or two of the specific embodiments, wherein the temperature regulator includes a flue heat exchanger H4, a flue carbon dioxide adsorber H5 and a fluidization fan F1,
the flue heat exchanger H4 is connected with the flue carbon dioxide absorber H5 and is used for cooling the received flue gas and outputting the cooled flue gas and the calcium-based compound to the flue carbon dioxide absorber H5;
the fluidization fan F1 is connected with the flue carbon dioxide absorber H5 and is used for providing wind power for the flue carbon dioxide absorber H5;
the flue carbon dioxide absorber H5 is connected with the cyclone separation carbonizer H6 and the first calcium-based compound distributor S1 and is used for receiving the calcium-based compound output by the first calcium-based compound distributor S1, cooled flue gas and the calcium-based compound, fluidizing the calcium-based compound by utilizing wind power without sinking, enabling the calcium-based compound to fully contact the cooled flue gas, absorbing carbon dioxide in the cooled flue gas by utilizing the calcium-based compound, and outputting a product to the cyclone separation carbonizer H6.
In this embodiment, F1 is a fan that adsorbs air from the atmosphere, then applies a fluidizing air to H5, and then fluidizes the calcium-based compound entering H5 via S1 to flow 12, so that the calcium-based compound is in sufficient contact with the flue gas, and if no fluidizing air is applied to F1, the calcium-based compound will sink to the bottom and be detrimental to sufficient contact with the flue gas.
The specific embodiment IV is as follows: the present embodiment is further defined by the calcium-based heat carrier circulating flue gas carbon dioxide capturing system according to the first or second embodiment, wherein in the present embodiment, the temperature of the received flue gas is reduced to 600 ℃ to 800 ℃.
In this embodiment, the optimum reaction temperature range of H5 is 600℃to 800 ℃.
Fifth embodiment: the embodiment is further defined by the calcium-based heat carrier circulating flue gas carbon dioxide capturing system according to the first embodiment, wherein the system further comprises a dust remover C1 and an induced draft fan F2,
the dust remover C1 is connected with the carbon dioxide cooler H7 and is used for removing impurities in carbon dioxide, and the carbon dioxide after removing the impurities is blown to the carbon dioxide storage tank G2 by the induced draft fan F2 for storage.
Specific embodiment six: the present embodiment is further defined by the calcium-based heat carrier circulating flue gas carbon dioxide capturing system according to the fifth embodiment, wherein the system further includes a carbon dioxide circulating fan F3,
and the carbon dioxide circulating fan F3 is used for receiving carbon dioxide from an outlet of the induced draft fan F2 and blowing the carbon dioxide into the mixed calcination reactor H3, so that the calcium-based compound heat carrier, the calcium carbonate and the calcium sulfate in the mixed calcination reactor H3 are heated and calcined more completely.
Seventh embodiment: the method for capturing carbon dioxide in the circulating flue gas of the calcium-based heat carrier according to the present embodiment is realized based on the system for capturing carbon dioxide in the circulating flue gas of the calcium-based heat carrier according to the first embodiment, and in the present embodiment, the method includes the following steps:
step 1, a limestone supplementing system G1 provides a calcium-based compound for a mixing and calcining reactor H3, and a first calcium-based compound distributor S1 distributes the calcium-based compound to the two-phase mixing heater H1 and the temperature regulator of the flue gas and the calcium-based compound heat carrier according to the requirements of the two-phase mixing heater H1 and the temperature regulator of the flue gas and the calcium-based compound heat carrier;
step 2, when the high-temperature flue gas containing carbon dioxide is received by a two-phase mixing heater H1 of the flue gas and the calcium-based compound heat carrier, mixing the high-temperature flue gas containing carbon dioxide with the calcium-based compound, and enabling the obtained high-temperature mixture to enter a cyclone separation heater H2;
step 3, heating and separating the high-temperature mixture to obtain flue gas and a calcium-based compound heat carrier, and sending the flue gas and the calcium-based compound heat carrier into a temperature regulator;
step 4, the temperature regulator cools the flue gas obtained in the step 3, and the calcium-based compound is used for adsorbing carbon dioxide in the cooled flue gas to obtain a product;
step 5, separating the product obtained in the step 4 into flue gas, calcium carbonate and calcium sulfate, outputting the separated flue gas to a generating device B1 of high-temperature flue gas, and outputting the separated calcium carbonate and calcium sulfate to a mixing and calcining reactor H3;
step 6, heating and calcining the calcium carbonate and the calcium sulfate obtained in the step 5 by using the calcium-based compound heat carrier obtained in the step 3 to generate carbon dioxide;
and 7, cooling the carbon dioxide obtained in the step 6, and storing the cooled carbon dioxide in a carbon dioxide storage tank G2.
Eighth embodiment: this embodiment is further defined by the calcium-based heat carrier circulating flue gas carbon dioxide capturing system according to embodiment seven, wherein the method further comprises step 8,
and 8, leading out a part of the cooled carbon dioxide from the cooled carbon dioxide by using a carbon dioxide circulating fan F3, and performing heating calcination in the step 6, so that the heating calcination is more complete.
Detailed description nine: in this embodiment, in step 4, the temperature regulator cools the flue gas obtained in step 3 to 600 ℃ to 800 ℃.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the different dependent claims and the features described herein may be combined in ways other than as described in the original claims. It is also to be understood that features described in connection with separate embodiments may be used in other described embodiments.
Claims (7)
1. The system is characterized by comprising a two-phase mixing heater (H1), a cyclone separation heater (H2), a mixing calcination reactor (H3), a temperature regulator, a cyclone separation carbonizer (H6), a carbon dioxide cooler (H7), a first calcium-based compound distributor (S1), a limestone supplementing system (G1) and a carbon dioxide storage tank (G2) for the circulating flue gas and carbon dioxide of the calcium-based heat carrier,
a limestone replenishment system (G1) connected to the mixing calcination reactor (H3) for storing the calcium-based compound and supplying the calcium-based compound to the mixing calcination reactor (H3);
a first calcium-based compound distributor (S1) which is connected with the mixing and calcining reactor (H3), the two-phase mixing heater (H1) of the flue gas and the calcium-based compound heat carrier and the temperature regulator, is used for distributing the calcium-based compound output by the mixing and calcining reactor (H3) to the two-phase mixing heater (H1) of the flue gas and the calcium-based compound heat carrier and the temperature regulator at the same time, and controlling the content of the calcium-based compound distributed to each of the two-phase mixing heater (H1) of the flue gas and the calcium-based compound heat carrier and the temperature regulator;
the flue gas and calcium-based compound heat carrier two-phase mixing heater (H1) is connected with the cyclone separation heater (H2) and the high-temperature flue gas generating device (B1) and is used for receiving the carbon dioxide-containing high-temperature flue gas emitted by the high-temperature flue gas generating device (B1), mixing the carbon dioxide-containing high-temperature flue gas with the entering calcium-based compound to obtain a high-temperature mixture, and entering the cyclone separation heater (H2);
the cyclone separation heater (H2) is connected with the mixing and calcining reactor (H3) and the temperature regulator and is used for heating and separating the entered high-temperature mixture to obtain flue gas and a calcium-based compound heat carrier, wherein the flue gas enters the temperature regulator, and the calcium-based compound heat carrier enters the mixing and calcining reactor (H3);
the temperature regulator is connected with the cyclone separation carbonizer (H6) and is used for cooling the received flue gas, the calcium-based compound output by the first calcium-based compound distributor (S1) is used for adsorbing carbon dioxide in the cooled flue gas, and the product is output to the cyclone separation carbonizer (H6);
the cyclone separation carbonizer (H6) is connected with the high-temperature flue gas generating device (B1) and the mixed calcination reactor (H3) and is used for separating the products into flue gas, calcium carbonate and calcium sulfate, outputting the separated flue gas to the high-temperature flue gas generating device (B1) and outputting the separated calcium carbonate and calcium sulfate to the mixed calcination reactor (H3);
a mixed calcination reactor (H3) connected with the carbon dioxide cooler (H7) for heating and calcining the calcium carbonate and the calcium sulfate by using the entering calcium-based compound heat carrier, and the generated carbon dioxide enters the carbon dioxide cooler (H7);
the carbon dioxide cooler (H7) is connected with the carbon dioxide storage tank (G2) and is used for cooling the carbon dioxide entering the carbon dioxide storage tank (G2) and storing the cooled carbon dioxide;
the temperature regulator is used for cooling the received flue gas to 600-800 ℃.
2. The calcium-based heat carrier circulating flue gas carbon dioxide capturing system according to claim 1, wherein the system further comprises a No. two calcium-based compound dispenser (S2),
the second calcium-based compound distributor (S2) is connected between the first calcium-based compound distributor (S1) and the flue gas and calcium-based compound heat carrier two-phase mixed heater (H1), and the second calcium-based compound distributor (S2) is used for re-distributing the calcium-based compound distributed by the first calcium-based compound distributor (S1) to the flue gas and calcium-based compound heat carrier two-phase mixed heater (H1) and the temperature regulator;
and the temperature regulator is used for cooling the received flue gas, absorbing carbon dioxide in the cooled flue gas by using the calcium-based compound output by the first calcium-based compound distributor (S1) and the calcium-based compound output by the second calcium-based compound distributor (S2), and outputting the product to the cyclone separation carbonizer (H6).
3. The system for capturing carbon dioxide in flue gas by calcium-based heat carrier circulation according to claim 1 or 2, wherein the temperature regulator comprises a flue heat exchanger (H4), a flue carbon dioxide adsorber (H5) and a fluidization fan (F1),
the flue heat exchanger (H4) is connected with the flue carbon dioxide absorber (H5) and is used for cooling the received flue gas and outputting the cooled flue gas and the calcium-based compound to the flue carbon dioxide absorber (H5);
the fluidization fan (F1) is connected with the flue carbon dioxide absorber (H5) and is used for providing wind power for the flue carbon dioxide absorber (H5);
and the flue carbon dioxide absorber (H5) is connected with the cyclone separation carbonizer (H6) and the first calcium-based compound distributor (S1) and is used for receiving the calcium-based compound output by the first calcium-based compound distributor (S1), cooled flue gas and the calcium-based compound, fluidizing the calcium-based compound by utilizing wind power without sinking, fully contacting the calcium-based compound with the cooled flue gas, absorbing carbon dioxide in the cooled flue gas by utilizing the calcium-based compound, and outputting a product to the cyclone separation carbonizer (H6).
4. The system for capturing carbon dioxide in flue gas by circulating a calcium-based heat carrier according to claim 1, wherein the system further comprises a dust collector (C1) and an induced draft fan (F2),
the dust remover (C1) is connected with the carbon dioxide cooler (H7) and is used for removing impurities in carbon dioxide, and the carbon dioxide after removing the impurities is blown to the carbon dioxide storage tank (G2) by the induced draft fan (F2) for storage.
5. The calcium-based heat carrier circulating flue gas carbon dioxide capturing system according to claim 4, further comprising a carbon dioxide circulating fan (F3),
and the carbon dioxide circulating fan (F3) is used for receiving carbon dioxide from the outlet of the induced draft fan (F2) and blowing the carbon dioxide into the mixed calcination reactor (H3), so that the heating calcination in the mixed calcination reactor (H3) is more complete.
6. A method for capturing carbon dioxide in a calcium-based heat carrier circulating flue gas, which is realized based on the calcium-based heat carrier circulating flue gas carbon dioxide capturing system according to claim 1, characterized in that the method comprises the following steps:
step 1, a limestone supplementing system (G1) provides a calcium-based compound for a mixing and calcining reactor (H3), and a first calcium-based compound distributor (S1) distributes the calcium-based compound to the flue gas and calcium-based compound heat carrier two-phase mixing heater (H1) and the temperature regulator according to the requirements of the flue gas and calcium-based compound heat carrier two-phase mixing heater (H1) and the temperature regulator;
step 2, when the two-phase mixing heater (H1) of the flue gas and the calcium-based compound heat carrier receives the high-temperature flue gas containing carbon dioxide, the high-temperature flue gas containing carbon dioxide and the calcium-based compound are mixed, and the obtained high-temperature mixture enters the cyclone separation heater (H2);
step 3, heating and separating the high-temperature mixture to obtain flue gas and a calcium-based compound heat carrier, and sending the flue gas and the calcium-based compound heat carrier into a temperature regulator;
step 4, the temperature regulator cools the flue gas obtained in the step 3, and the calcium-based compound is used for adsorbing carbon dioxide in the cooled flue gas to obtain a product;
step 5, separating the product obtained in the step 4 into flue gas, calcium carbonate and calcium sulfate, outputting the separated flue gas to a high-temperature flue gas generating device (B1), and outputting the separated calcium carbonate and calcium sulfate to a mixing and calcining reactor (H3);
step 6, heating and calcining the calcium carbonate and the calcium sulfate obtained in the step 5 by using the calcium-based compound heat carrier obtained in the step 3 to generate carbon dioxide;
step 7, cooling the carbon dioxide obtained in the step 6, and storing the cooled carbon dioxide in a carbon dioxide storage tank (G2);
and (3) cooling the flue gas obtained in the step (3) to 600-800 ℃ by a temperature regulator.
7. The method for capturing carbon dioxide in flue gas by circulating a calcium-based heat carrier according to claim 6, further comprising step 8,
and 8, leading out a part of the cooled carbon dioxide from the cooled carbon dioxide by using a carbon dioxide circulating fan (F3) to enter the step 6 for heating and calcining, so that the heating and calcining are more complete.
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| EP1637574A1 (en) * | 2004-09-15 | 2006-03-22 | Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg | Process and system for thermal gasification of compounds containing hydrocarbons |
| CN102307646A (en) * | 2008-11-19 | 2012-01-04 | 俄亥俄州立大学研究基金会 | Carbonation calcination reaction process for CO2 capture using a highly regenerable sorbent |
| CN108729965A (en) * | 2018-06-08 | 2018-11-02 | 华南理工大学 | The electricity generation system and CO of the part oxygen-enriched combusting of Combined with Calcium base chain2Capture method |
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| EP1637574A1 (en) * | 2004-09-15 | 2006-03-22 | Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg | Process and system for thermal gasification of compounds containing hydrocarbons |
| CN102307646A (en) * | 2008-11-19 | 2012-01-04 | 俄亥俄州立大学研究基金会 | Carbonation calcination reaction process for CO2 capture using a highly regenerable sorbent |
| CN108729965A (en) * | 2018-06-08 | 2018-11-02 | 华南理工大学 | The electricity generation system and CO of the part oxygen-enriched combusting of Combined with Calcium base chain2Capture method |
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