CN112537756A - Novel chemical chain air separation oxygen generation system and method adopting solar heat supply and application thereof - Google Patents
Novel chemical chain air separation oxygen generation system and method adopting solar heat supply and application thereof Download PDFInfo
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Abstract
The invention discloses a novel chemical chain air separation oxygen generation system with solar heat supply, which comprises an oxygen absorption reactor, an oxygen release reactor, a solar heating device, a steam generation device, a first heat exchanger and a power generation device, wherein the oxygen absorption reactor and the oxygen release reactor are connected through a pipeline, the solar heating device is used for providing heat for the oxygen release reactor, an outlet of the oxygen absorption reactor, the steam generation device and the power generation device are sequentially connected together through a pipeline, and an outlet of the oxygen release reactor and the first heat exchanger are connected together. The novel chemical chain air separation oxygen production method adopting solar heat supply comprises the following steps: the oxygen absorption reactor carries out oxidation reaction; leading oxygen-deficient air into a steam generating device, and carrying out reduction reaction by a oxygen release reactor; the steam generating device generates steam and leads the steam into the generating device; the oxygen releasing reactor releases oxygen and then leads the oxygen into the first heat exchanger, and the oxygen and the inert gas are mixed to form oxygen-enriched airflow. The invention also provides application of the novel chemical chain air separation oxygen generation system with solar heat supply.
Description
Technical Field
The invention belongs to the technical field of oxygen generation, and particularly relates to a novel chemical chain air separation oxygen generation system and method for solar heat supply and application thereof.
Background
The greenhouse effect affects the life of all human beings and is therefore widely concerned by countries around the world, where carbon capture and sequestration are the main solutions. Oxygen-enriched combustion is an important technical means for capturing carbon dioxide in combustion, but the traditional cryogenic air separation oxygen generation technology is high in cost and prevents further application and development of the technology, so that the research on the oxygen generation technology with low energy consumption is urgently needed at present.
The chemical chain air separation oxygen producing technology is one new type of oxygen producing technology, and the method is based on the oxidation reaction and oxygen absorbing and reducing reaction of oxygen carrier in oxygen absorbing reactor and oxygen releasing reactor separately. Research shows that the energy consumption of oxygen production of chemical chain air separation is reduced by about 40-70% compared with a cryogenic air separation system. Therefore, the chemical chain air separation oxygen generation can better meet the low energy consumption oxygen generation required by the oxygen-enriched combustion power plant.
Under the self-heating condition, namely no energy is supplied from the outside, the heat released by the oxygen absorption reactor is used for supplying the heat required to be absorbed by the oxygen release reactor, and the chemical chain air separation system can only provide oxygen-enriched airflow with the oxygen concentration of 12-14% to the oxygen-enriched combustion hearth. For an oxyfuel combustion boiler, the inflow oxygen concentration is suitably 30% or more in order to maintain stable flame and good pulverized coal burn-out rate in the furnace. Therefore, the chemical-looping air separation oxygen generation system under the self-heating condition cannot meet the requirement of the oxygen-enriched combustion boiler on oxygen concentration. In order to obtain higher oxygen concentration, the operating temperature of the oxygen absorption reactor can be increased to be higher than that of the oxygen release reactor, so as to increase the equilibrium oxygen partial pressure and further increase the oxygen concentration. Because the operating temperature of the oxygen absorption reactor is lower than that of the oxygen release reactor, the oxygen carrier can not carry the heat released in the oxygen absorption reactor to maintain the reaction in the oxygen release reactor, and additional energy is needed to be supplied to the oxygen release reactor.
In summary, there is a need to develop a chemical-looping air separation oxygen generation system with a temperature of the oxygen release reactor higher than that of the oxygen absorption reactor, so as to increase the equilibrium oxygen partial pressure in the oxygen release reactor, promote oxygen release and increase oxygen concentration in the produced gas.
The invention content is as follows:
the invention aims to provide a novel chemical-looping air separation oxygen generation system and method adopting solar heat supply and application thereof, which can solve the technical problem that a chemical-looping air separation system in the prior art can only provide oxygen-enriched airflow with the oxygen concentration of 12% -14%, so that the temperature of an oxygen release reactor is 50-100 ℃ higher than that of an oxygen absorption reactor, the balanced oxygen partial pressure in the oxygen release reactor is increased, the oxygen release is promoted, and the oxygen concentration in the produced gas is increased.
In order to achieve the purpose, the invention adopts the following technical scheme:
a novel chemical chain air separation oxygen generation system adopting solar heat supply comprises an oxygen absorption reactor, an oxygen release reactor, a solar heating device, a steam generation device, a first heat exchanger and a power generation device, wherein the oxygen absorption reactor and the oxygen release reactor are connected through a pipeline; the steam generating device is also provided with a water supply inlet and an oxygen-deficient air outlet, and the first heat exchanger is also provided with an inert gas inlet and an oxygen-enriched airflow outlet.
In a further improved embodiment, the solar heating device is a tower-type solar heating device.
On the basis of the above embodiment, in another improved embodiment, the steam generating device is a second heat exchanger, and the power generating device includes a steam turbine and a power generator.
On the basis of the above embodiment, in another modified embodiment, still include air draught fan and inert gas draught fan, the air draught fan is used for to the entry of oxygen absorption reactor lets in the air, the inert gas draught fan is used for to first heat exchanger lets in inert gas.
The invention also provides a novel chemical chain air separation oxygen generation method adopting solar heat supply, which adopts the novel chemical chain air separation oxygen generation system adopting solar heat supply to carry out chemical chain air separation oxygen generation and specifically comprises the following steps:
s1, air enters the oxygen absorption reactor and is subjected to oxidation reaction with low-potential oxygen carriers in the oxygen absorption reactor, and the oxygen carriers absorb oxygen in the air to become high-potential oxygen carriers;
s2, separating the high potential oxygen carrier from the oxygen-deficient air in the step S2, introducing the oxygen-deficient air into a steam generating device for heat exchange, introducing the high potential oxygen carrier into a oxygen release reactor for reduction reaction and releasing oxygen;
s3, discharging the oxygen-deficient air after heat exchange in the step S2 to the atmosphere, and introducing steam generated in a steam generating device into a generating device for generating electricity;
s4, introducing inert gas into the oxygen release reactor through the first heat exchanger to be used as fluidizing gas; oxygen released by the oxygen carrier in the oxygen release reactor is mixed with the inert gas to form oxygen-enriched airflow, the oxygen-enriched airflow passes through the first heat exchanger and heats the inert gas at the inlet of the first heat exchanger, and finally the oxygen-enriched airflow is introduced into the aerobic equipment.
On the basis of the above embodiment, in another modified embodiment, the reaction temperature range of the oxygen release reactor in the step S1 and/or the oxygen absorption reactor in the step S2 is 900 ℃ to 1050 ℃.
On the basis of the above embodiment, in another modified embodiment, the temperature of the oxygen release reactor is 50 ℃ to 100 ℃ higher than the reaction temperature of the oxygen absorption reactor.
In a further improved embodiment, on the basis of the above embodiment, the oxygen carrier in step S1 and step S2 is copper-based metal oxide CuO/Cu2O, Mn-based metal oxide Mn2O3/Mn3O4Cobalt-based metal oxide Co3O4Any one or a mixture of two or more of/CoO.
In a further improved embodiment, the oxygen carrier further comprises an inert metal oxide as a carrier, and the inert metal compound is SiO2、ZrO2And TiO2One or a mixture of two or more of them.
In another modified embodiment, on the basis of the above embodiment, the inert gas in step S4 is CO2Or water vapor.
The invention also provides an application of the novel chemical chain air separation oxygen generation system with solar heat supply, which comprises the novel chemical chain air separation oxygen generation system, an oxygen-enriched combustion system and a sludge/biomass drying and carbonizing unit, wherein the oxygen-enriched combustion system comprises a combustion boiler, a flue gas purification unit and a tail gas treatment unit which are sequentially connected through pipelines, and the sludge/biomass drying and carbonizing unit comprises a drying unit and a carbonizing unit which are communicated with each other; the oxygen release reactor is communicated with the combustion boiler through a pipeline, the oxygen release reactor is used for providing oxygen-enriched gas for the combustion boiler, and the solar heating device is used for providing high-temperature heat energy for the carbonization unit.
On the basis of the above embodiment, in another improved embodiment, the outlet of the flue gas purification unit is simultaneously communicated with the drying unit, the tail gas treatment unit and the oxygen release reactor through pipelines, the carbonization unit is communicated with the combustion boiler through pipelines, and combustible gas generated after carbonization in the carbonization unit is introduced into the combustion boiler for combustion.
In addition to the above-described embodiments, in another modified embodiment, the flue gas purification unit includes a superheater, a reheater, a denitration reactor, and a dust remover, which are connected in this order by a pipeline.
In a further improved embodiment, the off-gas treatment unit is a carbon capture device.
The invention has the following beneficial effects:
1. in the prior art, the reaction temperature of the oxygen release reactor and the oxygen absorption reactor is 850-1050 ℃. In the actual operation process, the oxygen carrier Me in the oxygen absorption reactor and oxygen in the air generate oxidation reaction to release heat; oxygen carrier MeO in the oxygen release reactor is decomposed to release oxygen and absorb heat. Therefore, it is necessary to provide a part of heat from the outside to maintain the temperature of the oxygen release reactor and thus the redox reaction process. According to the novel chemical chain air separation oxygen generation system adopting solar heat supply, the solar heating device is added to supply heat to the oxygen release reactor, so that the temperature of the oxygen release reactor is 50-100 ℃ higher than that of the oxygen absorption reactor. The oxygen-enriched gas flow with the target oxygen concentration is obtained by maintaining the lower oxygen partial pressure in the oxygen absorption reactor and the higher oxygen partial pressure in the oxygen release reactor; moreover, the equilibrium oxygen partial pressure of the oxygen-releasing reactor increases and the amount of inert gas required will decrease; the equilibrium oxygen partial pressure of the oxygen absorption reactor is reduced, the amount of required air can be reduced, and the power consumption of the air induced draft fan and the inert gas induced draft fan is further reduced. Meanwhile, the oxygen-deficient air at the outlet of the oxygen absorption reactor is used for heating the feed water in the steam generating device to generate steam, and the steam is introduced into a steam turbine to push a generator to generate electric quantity, so that the energy released by the oxygen absorption reactor is utilized.
2. According to the novel chemical-chain air-separation oxygen production method adopting solar heat supply, heat is supplied to the oxygen release reactor through the solar heating device, water in the steam generation device is heated by using oxygen-poor air at the outlet of the oxygen absorption reactor, steam is generated and is introduced into the power generation device to generate power, the energy of each link is fully utilized, the energy utilization rate is improved, and energy waste is avoided.
3. The application of the novel solar heat supply chemical chain air separation oxygen generation system combines the chemical chain air separation oxygen generation system, the oxygen-enriched combustion system and the sludge/biomass drying and carbonizing unit together, so that oxygen-enriched air flow with higher oxygen concentration is supplied to the oxygen-enriched combustion system, high-temperature heat energy produced by the solar heating device is used for mixed combustion of sludge/biomass, and heat energy produced in each link is fully utilized.
Drawings
FIG. 1 is a schematic diagram of the main structure of a novel chemical-looping air separation oxygen production system with solar heating in example 1 (arrows indicate flow direction);
fig. 2 is a block diagram of the components of the application of the novel solar-powered chemical-looping air separation oxygen generation system in example 2 (arrows indicate flow).
Reference numerals: 1-air induced draft fan, 2-oxygen absorption reactor, 3-oxygen release reactor, 4-solar heating device, 5-inert gas induced draft fan, 6-first heat exchanger, 7-second heat exchanger, 8-steam turbine, 9-generator, A-air, B-inert gas, C-oxygen-enriched air flow, D-oxygen-poor air and a-mixture flow
Detailed Description
The following preferred embodiments of the present invention are provided to aid in a further understanding of the invention. It should be understood by those skilled in the art that the description of the embodiments of the present invention is by way of example only, and not by way of limitation.
Example 1
Referring to the schematic diagram of fig. 1, the novel chemical-looping air-separation oxygen generation system using solar energy for heat supply in the embodiment includes an oxygen absorption reactor 2, an oxygen release reactor 3, a solar heating device 4, a steam generation device, a first heat exchanger 6, and a power generation device, wherein the oxygen absorption reactor 2 and the oxygen release reactor 3 are connected through a pipeline, the solar heating device 4 is used for providing heat for the oxygen release reactor 3, an outlet of the oxygen absorption reactor 2, the steam generation device, and the power generation device are sequentially connected together through a pipeline, and an outlet of the oxygen release reactor 3 and the first heat exchanger 6 are connected together through a pipeline; the steam generating device is also provided with a feed water inlet and an oxygen-deficient air outlet, and the first heat exchanger 6 is also provided with an inert gas inlet and an oxygen-enriched airflow outlet.
The solar heating device 4 in this embodiment is a tower-type solar heating device, and the tower-type solar heating device includes a receiver, a high-temperature heat storage device, a heat exchange device, a water feed pump, a condenser, and other main components, wherein the heat exchange device is tightly attached to the outer wall of the oxygen release reactor 3, so as to provide heat for the oxygen release reactor 3. Since the tower-type solar heating device belongs to the prior art and is a mature product which can be purchased in the market, the detailed structure and connection relationship thereof are not repeated herein. Other forms of solar heating means may be selected as desired in other embodiments.
Referring to fig. 1, the steam generating device in this embodiment is a second heat exchanger 7, and the power generating device includes a steam turbine 8 and a power generator 9. When feed water is introduced into the second heat exchanger 7, the oxygen-deficient air enters the second heat exchanger 7 and exchanges heat with the feed water, the oxygen-deficient air after heat exchange is discharged to the atmosphere, and the steam generated after the feed water is heated enters the steam turbine 8, so that the generator 9 is driven to generate electricity. Therefore, the heat of the oxygen-poor air heat exchange is fully utilized, and the effects of energy conservation and emission reduction are realized.
Continuing to refer to the attached figure 1, on the basis of the above embodiment, in another modified embodiment, the reactor further comprises an air induced draft fan 1 and an inert gas induced draft fan 5, wherein the air induced draft fan 1 is used for introducing air to the inlet of the oxygen absorption reactor 2 and performing oxidation reaction with the low potential oxygen carriers in the oxygen absorption reactor 2; the inert gas draught fan 5 is used for introducing inert gas into the first heat exchanger 6, and mixing and exchanging heat with the oxygen-enriched gas released by the oxygen release reactor 3. Set up like this, can guarantee in whole use, have sufficient air and inert gas to enter into this novel chemical chain air separation system oxygen of making, guarantee going on smoothly of reaction.
According to the novel solar-powered heat supply chemical-chain air separation oxygen generation system, the solar heating device 4 is added to supply heat to the oxygen release reactor 3, so that the temperature of the oxygen release reactor 3 is 50-100 ℃ higher than that of the oxygen absorption reactor 2. This is mainly to maintain a lower oxygen partial pressure in the oxygen absorption reactor 2 and a higher oxygen partial pressure in the oxygen release reactor 3, thereby obtaining an oxygen-enriched gas stream of a target oxygen concentration; moreover, the equilibrium oxygen partial pressure of the oxygen-releasing reactor 3 is increased and the amount of inert gas required will be reduced; the equilibrium oxygen partial pressure of the oxygen absorption reactor 2 is reduced, and the amount of required air is reduced, so that the power consumption of the air induced draft fan 1 and the inert gas induced draft fan 5 is further reduced. Meanwhile, oxygen-deficient air at the outlet of the oxygen absorption reactor 2 is used for heating feed water in the steam generating device to generate steam, and the steam is introduced into a steam turbine 8 to drive a generator 9 to generate electric quantity, so that the energy released by the oxygen absorption reactor 2 is utilized.
Referring to the schematic diagram of fig. 1, the method for performing chemical-looping air-separation oxygen generation by using the novel chemical-looping air-separation oxygen generation system using solar heat supply in the embodiment specifically includes the following steps:
s1, allowing air to enter the oxygen absorption reactor 2, and carrying out oxidation reaction with low-potential oxygen carriers in the oxygen absorption reactor 2, wherein the oxygen carriers absorb oxygen in the air to become high-potential oxygen carriers;
s2, separating the high potential oxygen carriers from the oxygen-deficient air in the step S2 (separation can be carried out by adopting a cyclone separator), introducing the oxygen-deficient air into a steam generating device (namely, a second heat exchanger 7 in the attached drawing 1) for heat exchange, introducing the high potential oxygen carriers into an oxygen release reactor 3 for reduction reaction and releasing oxygen;
s3, discharging the oxygen-deficient air after heat exchange in the step S2 to the atmosphere, and introducing steam generated in the steam generating device into a power generating device for power generation (namely, the steam enters the steam turbine 8 to drive the power generator 9 to generate power);
s4, introducing inert gas into the oxygen release reactor 3 through the first heat exchanger 6 to be used as fluidizing gas; oxygen released by the oxygen carrier in the oxygen release reactor 3 is mixed with inert gas to form oxygen-enriched air flow, the oxygen-enriched air flow passes through the first heat exchanger 6 and heats the inert gas at the inlet of the first heat exchanger 6, and finally the oxygen-enriched air flow is introduced into aerobic equipment.
In this embodiment, the reaction temperature range of the oxygen release reactor 3 in the step S1 and/or the oxygen absorption reactor 2 in the step S2 is 900 ℃ to 1050 ℃. On the basis of the embodiment, in another modified embodiment, the temperature of the oxygen release reactor 3 is 50-100 ℃ higher than the reaction temperature of the oxygen absorption reactor 2. This is mainly to maintain a lower oxygen partial pressure in the oxygen absorption reactor 2 and a higher oxygen partial pressure in the oxygen release reactor 3, thereby obtaining an oxygen-enriched gas stream of a target oxygen concentration.
The oxygen carrier in step S1 and step S2 in the present example was a copper-based metal oxide CuO/Cu2And O. In other embodiments, manganese-based metal oxides Mn may also be used2O3/Mn3O4Or cobalt-based metal oxide Co3O4CuO/Cu or Cu-based metal oxide2Any one of O or a mixture of two or more thereof.
On the basis of the above-mentioned embodiment, in another improved embodiment, the oxygen carrier further comprises an inert metal oxide as a carrier, and the inert metal compound is SiO2、ZrO2And TiO2One or a mixture of two or more of them. This improves the sintering resistance of the oxygen carrier.
In this embodiment, the inert gas in step S4 is steam, and the steam is introduced into the oxygen release reactor 3 through the first heat exchanger 6 as a fluidization gas; oxygen released by the oxygen carrier in the oxygen release reactor 3 is mixed with water vapor to form oxygen-enriched air flow, and the oxygen-enriched air flow is condensed to obtain pure oxygen. In another embodiment, the inert gas in step S4 is CO2Oxygen released by the oxygen release reactor 3 is mixed with CO in the inert gas heat exchanger2Mixing to form an oxygen-enriched air flow with the oxygen concentration of about 30 percent.
According to the novel chemical-chain air-separation oxygen production method adopting solar heat supply, heat is supplied to the oxygen release reactor 3 through the solar heating device 4, the water in the steam generation device is heated by using the oxygen-poor air at the outlet of the oxygen absorption reactor 2, and the generated steam is introduced into the power generation device to generate power, so that the energy of each link is fully utilized, the energy utilization rate is improved, and the energy waste is avoided.
Example 2
The embodiment provides an application of a novel chemical-chain air-separation oxygen generation system with solar heat supply, which comprises the novel chemical-chain air-separation oxygen generation system as described in embodiment 1, and further comprises an oxygen-enriched combustion system and a sludge/biomass drying and carbonizing unit, wherein the oxygen-enriched combustion system comprises a combustion boiler, a flue gas purification unit and a tail gas treatment unit which are sequentially connected through pipelines, and the sludge/biomass drying and carbonizing unit comprises a drying unit and a carbonizing unit which are communicated with each other; the oxygen release reactor 3 is communicated with the combustion boiler through a pipeline, the oxygen release reactor 3 is used for providing oxygen-enriched gas for the combustion boiler, and the solar heating device 4 is used for providing high-temperature heat energy for the carbonization unit.
In the prior art, the sludge drying coupling power generation technology is that wet sludge is indirectly dried by saturated steam, then a totally-closed dried sludge bin is adopted for storage, and finally mixing combustion is carried out by a closed belt coal mill. The biomass gasification technology is mainly adopted to process biomass, and the key is a gasification furnace system. The former needs to utilize valuable steam resources, and the biomass gasification furnace has the defects of overhigh investment cost and operation cost and insufficient energy utilization.
In this embodiment, the dry carbomorphism of making oxygen system, mud/living beings is divided to the chemical chain and the oxygen boosting combustion system is in the same place, sends into the mud/living beings after the carbomorphism the oxygen boosting burning boiler and mixes the burning, and combustion efficiency is high, has reduced the energy consumption, and the abundant effectual high temperature heat energy that has utilized solar heating device 4 to provide.
Referring to the schematic diagram of fig. 1, in this embodiment, the sludge/biomass is first dried and carbonized before being transferred to the oxycombustion boiler for blending combustion. In this embodiment, the tower-type solar heating apparatus 4 is used to carbonize the sludge/biomass at a high temperature. Simultaneously extracting a part of smoke generated by the oxygen-enriched combustion boiler as fluidizing gas, and introducing the smoke into a drying unit of sludge/biomass for primary drying; then the flue gas and the dried sludge/biomass are introduced into a carbonization unit, the flue gas and the combustible gas/biomass charcoal generated by the drying and carbonization device form a mixed material flow, the mixed material flow is introduced into an oxygen-enriched combustion boiler for combustion, and the carbonized sludge and biomass charcoal can be sent into an oxygen-enriched combustion hearth after being crushed. In this embodiment, the high-temperature heat energy provided by the solar heating device 4 is fully utilized to dry the carbonized sludge/biomass, and the combustible gas and sludge/biomass powder slag generated in the carbonization process can be treated in the oxygen-enriched combustion boiler, so that the waste gas and garbage polluting the environment are avoided, and the energy is saved while the requirement of environmental protection is met.
The following briefly introduces the novel chemical chain air separation oxygen generation system in the embodiment, which also includes the approximate working flows and various process parameters of the oxygen-enriched combustion system and the sludge/biomass drying and carbonizing unit, with reference to the schematic diagrams of fig. 1 and 2. In this embodiment, the oxygen carrier is preferably CuO/ZrO2The temperature of the oxygen release reactor 3 is 1050 ℃, and the temperature of the oxygen absorption reactor 2 is 950 ℃. Air is introduced into the oxygen absorption reactor 2 and is subjected to oxidation reaction with low potential oxygen carriers Me in the oxygen absorption reactor 2, the low potential oxygen carriers absorb oxygen in the air to become high potential oxygen carriers MeO, then the high potential oxygen carriers are separated from the oxygen-poor air, wherein the oxygen-poor air is introduced into a steam generating device to exchange heat with feed water, the oxygen-poor air after heat exchange is discharged into the atmosphere, and the feed water is heated to generate steam which is introduced into a power generating device, namely, the steam turbine 8 and the power generator 9 are used for generating power. The high potential oxygen carrier MeO is introduced into the oxygen release reactor 3, and simultaneously the circulating flue gas of the oxygen-enriched combustion boiler is introduced into the oxygen release reactor 3 as inert gas, the high potential oxygen carrier MeO is subjected to decomposition reaction at 1050 ℃ to generate oxygen-enriched air flow with the oxygen concentration of 30%, and then the oxygen-enriched air flow and the inlet circulating flue gas are subjected to heat exchange and introduced into the oxygen-enriched combustion hearth. During the operation period, the tower type solar heat utilization device provides heat for the oxygen release reactor 3 to maintain the reaction temperature; meanwhile, the tower-type solar heat utilization device also provides heat energy for the sludge/biomass drying and carbonizing device, so that the sludge/biomass is carbonized under the high-temperature condition.
On the basis of the above embodimentsIn another improved embodiment, the outlet of the flue gas purification unit is simultaneously communicated with the drying unit, the tail gas treatment unit and the oxygen release reactor 3 through pipelines, the carbonization unit is communicated with the combustion boiler through pipelines, and combustible gas generated after carbonization in the carbonization unit is introduced into the combustion boiler for combustion. That is, the flue gas that oxygen boosting burning boiler produced divides into three after flue gas purification unit handles: one stream is used as circulating flue gas and is introduced into an oxygen release reactor 3 to be used as inert gas, the second stream of flue gas is used as fluidizing gas and is introduced into a sludge/biomass drying and carbonizing device to primarily dry sludge/biomass and carry generated combustible gas to form mixed material stream, and finally the mixed material stream is introduced into an oxygen-enriched combustion hearth, and the third stream of flue gas is introduced into a tail gas treatment unit because the main component of the tail gas treatment unit is CO2And H2O, so that water can be separated by a compression condensing unit to obtain CO of high purity2The capture and the sealing of the carbon dioxide are completed, and the greenhouse effect is reduced.
On the basis of the above embodiment, in another improved embodiment, the flue gas purification unit comprises a superheater, a reheater, a denitration reactor and a dust remover which are sequentially connected through pipelines. Therefore, after the flue gas generated by the oxygen-enriched combustion boiler is treated by the superheater, the reheater, the denitration reactor and the dust remover, pollutants such as acidic substances, fine dust and the like in the flue gas can be removed.
On the basis of the above embodiment, in another modified embodiment, the tail gas treatment unit is a carbon capture device, and can capture and store carbon dioxide.
The application of the novel solar heat supply chemical chain air separation oxygen generation system combines the chemical chain air separation oxygen generation system, the oxygen-enriched combustion system and the sludge/biomass drying and carbonizing unit together, so that oxygen-enriched air flow with higher oxygen concentration is supplied to the oxygen-enriched combustion system, high-temperature heat energy produced by the solar heating device is used for mixed combustion of sludge/biomass, and heat energy produced in each link is fully utilized.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application and not for limiting the protection scope thereof, and although the present application is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: numerous variations, modifications, and equivalents will occur to those skilled in the art upon reading the present application and are within the scope of the claims as issued or as granted.
Claims (10)
1. A novel chemical chain air separation oxygen generation system adopting solar heat supply is characterized by comprising an oxygen absorption reactor, an oxygen release reactor, a solar heating device, a steam generation device, a first heat exchanger and a power generation device, wherein the oxygen absorption reactor and the oxygen release reactor are connected through a pipeline; the steam generating device is also provided with a water supply inlet and an oxygen-deficient air outlet, and the first heat exchanger is also provided with an inert gas inlet and an oxygen-enriched airflow outlet.
2. The novel solar heating chemical-looping air separation oxygen generation system according to claim 1, further comprising an air induced draft fan and an inert gas induced draft fan, wherein the air induced draft fan is used for introducing air to an inlet of the oxygen absorption reactor, and the inert gas induced draft fan is used for introducing inert gas to the first heat exchanger.
3. The novel chemical chain air separation oxygen generation method through solar heat supply is characterized in that the novel chemical chain air separation oxygen generation system through solar heat supply according to claim 1 or claim 2 is adopted to perform chemical chain air separation oxygen generation, and the method specifically comprises the following steps:
s1, air enters the oxygen absorption reactor and is subjected to oxidation reaction with low-potential oxygen carriers in the oxygen absorption reactor, and the oxygen carriers absorb oxygen in the air to become high-potential oxygen carriers;
s2, separating the high potential oxygen carrier from the oxygen-deficient air in the step S2, introducing the oxygen-deficient air into a steam generating device for heat exchange, introducing the high potential oxygen carrier into a oxygen release reactor for reduction reaction and releasing oxygen;
s3, discharging the oxygen-deficient air after heat exchange in the step S2 to the atmosphere, and introducing steam generated in a steam generating device into a generating device for generating electricity;
s4, introducing inert gas into the oxygen release reactor through the first heat exchanger to be used as fluidizing gas; oxygen released by the oxygen carrier in the oxygen release reactor is mixed with the inert gas to form oxygen-enriched airflow, the oxygen-enriched airflow passes through the first heat exchanger and heats the inert gas at the inlet of the first heat exchanger, and finally the oxygen-enriched airflow is introduced into the aerobic equipment.
4. The novel solar-powered chemical-looping air separation oxygen generation method according to claim 3, characterized in that the reaction temperature range of the oxygen release reactor in the step S1 and/or the oxygen absorption reactor in the step S2 is 900-1050 ℃.
5. The novel solar-powered chemical-looping air-separation oxygen generation method according to claim 4, characterized in that the temperature of the oxygen release reactor is 50-100 ℃ higher than the reaction temperature of the oxygen absorption reactor.
6. The novel chemical-looping air separation oxygen generation method with solar heating according to claim 3, characterized in that the oxygen carrier in the steps S1 and S2 is copper-based metal oxide CuO/Cu2O, Mn-based metal oxide Mn2O3/Mn3O4Cobalt-based metal oxide Co3O4Any one or a mixture of two or more of/CoO.
7. The novel solar-powered chemical-looping air-separation oxygen generation method according to claim 6, characterized in that the oxygen carrier further comprises an inert metal oxide as a carrier, and the inert metal oxide is used as the carrierThe inert metal compound is SiO2、ZrO2、TiO2One or a mixture of two or more of them.
8. The novel solar-powered chemical-looping air-separation oxygen production method according to claim 3, characterized in that the inert gas in the step S4 is CO2Or water vapor.
9. The application of the novel chemical chain air separation oxygen generation system with solar heat supply is characterized by comprising the novel chemical chain air separation oxygen generation system as claimed in claim 1 or 2, and further comprising an oxygen-enriched combustion system and a sludge/biomass drying and carbonizing unit, wherein the oxygen-enriched combustion system comprises a combustion boiler, a flue gas purification unit and a tail gas treatment unit which are sequentially connected through pipelines, and the sludge/biomass drying and carbonizing unit comprises a drying unit and a carbonizing unit which are communicated with each other; the oxygen release reactor is communicated with the combustion boiler through a pipeline, the oxygen release reactor is used for providing oxygen-enriched gas for the combustion boiler, and the solar heating device is used for providing high-temperature heat energy for the carbonization unit.
10. The application of the novel solar-powered chemical-looping air-separation oxygen generation system is characterized in that an outlet of the flue gas purification unit is simultaneously communicated with the drying unit, the tail gas treatment unit and the oxygen release reactor through pipelines, the carbonization unit is communicated with the combustion boiler through a pipeline, and combustible gas generated after carbonization in the carbonization unit is introduced into the combustion boiler for combustion.
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