CN219291039U - Ammonia decarbonization system - Google Patents
Ammonia decarbonization system Download PDFInfo
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- CN219291039U CN219291039U CN202223487588.7U CN202223487588U CN219291039U CN 219291039 U CN219291039 U CN 219291039U CN 202223487588 U CN202223487588 U CN 202223487588U CN 219291039 U CN219291039 U CN 219291039U
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- cooling tower
- decarbonizing
- ammonium bicarbonate
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 313
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 156
- 238000005262 decarbonization Methods 0.000 title claims abstract description 62
- 238000001816 cooling Methods 0.000 claims abstract description 113
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 68
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000001099 ammonium carbonate Substances 0.000 claims abstract description 50
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims abstract description 49
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims abstract description 49
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 34
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 34
- 239000003546 flue gas Substances 0.000 claims abstract description 27
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000010521 absorption reaction Methods 0.000 claims abstract description 24
- 239000007788 liquid Substances 0.000 claims description 50
- 239000002826 coolant Substances 0.000 claims description 26
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 25
- 238000006477 desulfuration reaction Methods 0.000 claims description 25
- 230000023556 desulfurization Effects 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 239000007789 gas Substances 0.000 claims description 11
- 230000002745 absorbent Effects 0.000 claims description 5
- 239000002250 absorbent Substances 0.000 claims description 5
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims description 4
- 235000011130 ammonium sulphate Nutrition 0.000 claims description 4
- 230000008020 evaporation Effects 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims 1
- 238000005261 decarburization Methods 0.000 abstract description 15
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000006227 byproduct Substances 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 8
- 239000003337 fertilizer Substances 0.000 description 5
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 5
- 239000000284 extract Substances 0.000 description 4
- 239000012452 mother liquor Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 108010063955 thrombin receptor peptide (42-47) Proteins 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- BVCZEBOGSOYJJT-UHFFFAOYSA-N ammonium carbamate Chemical compound [NH4+].NC([O-])=O BVCZEBOGSOYJJT-UHFFFAOYSA-N 0.000 description 1
- 235000012501 ammonium carbonate Nutrition 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- KXDHJXZQYSOELW-UHFFFAOYSA-N carbonic acid monoamide Natural products NC(O)=O KXDHJXZQYSOELW-UHFFFAOYSA-N 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000618 nitrogen fertilizer Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
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- Treating Waste Gases (AREA)
Abstract
The utility model relates to an ammonia decarburization system, which comprises an ammonia decarburization device and a cooling tower, wherein the cooling tower is connected with the ammonia decarburization device, and the ammonia decarburization device sequentially comprises a cooling functional area (2) and an ammonium bicarbonate generating area along the flow direction of flue gas(5) A carbon dioxide absorption zone (7) and an ammonia removal functional zone (15), the ammonia decarbonization device being configured for absorbing CO with ammonia from a carbon dioxide containing zone 2 CO removal from flue gas of (2) 2 To produce ammonium bicarbonate, the cooling tower configured to extract heat from the ammonia decarbonization device. The ammonia decarburization system can achieve the purpose of environmental protection in an energy-saving mode and obtain byproducts with economic value. In particular in winter, when the ambient temperature is low, the ammonia decarbonization system can be operated with particularly low energy consumption and low cost.
Description
Technical Field
The utility model belongs to the technical field of environmental protection, and particularly relates to an ammonia decarburization system.
Background
At present, industrial enterprises contain SO 2 And CO 2 Is generally low in treatment efficiency. Such exhaust gas may be discharged into the atmosphere after passing only through desulfurization dust removal treatment. High CO content 2 Greenhouse gases are discharged into the environment, which causes a series of environmental problems such as global warming and acceleration. Thus seeking to be active and efficient in CO 2 The gas treatment method is one of the problems to be solved urgently in various countries.
Ammonium bicarbonate is a quick-acting nitrogen fertilizer, is easily dissolved in water and decomposed, and is suitable for various crops and various soils. CO 2 May be one of the raw materials used to prepare the ammonium bicarbonate. If CO in industrial waste gas is to be treated 2 The gas is used as raw material to prepare ammonium bicarbonate, which not only solves the problem of CO 2 The problem of direct release into the atmosphere and the production of ammonium bicarbonate fertilizer are problems of research and development of technicians. The absorbent ammonia is volatile, which may cause ammonia to escape during the production process. If a large amount of ammonia escapes, not only the decarburization cost of the ammonia process is increased, but also secondary pollution is caused. In order to solve this problem, means for reducing the decarbonization temperature by the ammonia process may be employed to reduce ammonia slip. Refrigerators are known in practice, by means of which refrigeration can be produced for temperature control in decarbonization by the ammonia process. Typically, however, the operation of a refrigerator requires a relatively large consumption of energy, such as electrical energy.
Disclosure of Invention
The utility modelThe novel object is to create an ammonia decarbonization system, in particular an ammonia desulfurization decarbonization system integrated with a desulfurization function, by means of which an economic and environmentally friendly removal from a carbon monoxide-containing system can be achieved in an energy-saving manner 2 CO removal from flue gas of (2) 2 。
The object is achieved by an ammonia decarbonization system comprising an ammonia decarbonization device and a cooling tower, the cooling tower being connected to the ammonia decarbonization device, the ammonia decarbonization device comprising, in succession, a cooling function zone, an ammonium bicarbonate generation zone, a carbon dioxide absorption zone and an ammonia removal function zone along the flow direction of the flue gas, the ammonia decarbonization device being configured for absorbing CO-containing gas with an ammonia absorbent 2 CO removal from flue gas of (2) 2 To produce ammonium bicarbonate, the cooling tower configured to extract heat from the ammonia decarbonization device.
When the ammonia decarburization system according to the utility model is operated, the ammonia decarburization device can be cooled by the cooling tower, so that the ammonia decarburization device can be operated in a favorable temperature range, and CO in the flue gas can be effectively realized 2 While substantially avoiding ammonia slip. Compared with the cooling of the ammonia decarbonizing device by a refrigerator, the measures according to the utility model can be energy-saving, especially when the temperature is low in winter.
In some embodiments, the ammonia decarbonization system may not include a desulfurization device, such as an ammonia desulfurization device, and thus constitute a pure ammonia decarbonization system.
In some embodiments, the ammonia decarbonization device can be connected to an ammonia desulfurization device upstream of the ammonia decarbonization device such that the ammonia decarbonization system is supplemented as an ammonia desulfurization decarbonization system, wherein the ammonia desulfurization device is configured for absorbing SO from the aqueous stream with ammonia 2 And CO 2 Is used for removing SO from flue gas of (1) 2 To produce ammonium sulfate. In this case, the flue gas leaving the ammonia desulfurization device may contain substantially no or only a small amount of pollutant SO 2 And mainly comprises pollutant CO 2 。
In some embodiments, the cooling tower may have water as a circulating coolant, wherein the cooling tower has an input for filling the cooling tower with water.
In some embodiments, the cooling tower may have a mixture of water and glycol as the circulating coolant, wherein the cooling tower has separate inputs for separately filling the cooling tower with water and glycol, or the cooling tower has a common input for filling the cooling tower with water and glycol.
In some embodiments, the cooling tower may be configured as an open cooling tower including a circulating coolant outlet and an inlet, and the ammonia decarbonization device is provided with a heat exchanger including a circulating coolant outlet and an inlet and an ammonia decarbonization recycle liquid outlet and an inlet.
In some embodiments, the cooling tower may be configured as a closed cooling tower, the closed cooling tower including a circulating coolant outlet and inlet, the circulating coolant loop including a first heat exchanger including a circulating coolant outlet and inlet and an intermediate medium outlet and inlet, the ammonia decarbonization device being configured with a second heat exchanger including an intermediate medium outlet and inlet and an ammonia decarbonization liquid outlet and inlet, the first heat exchanger and the second heat exchanger being interconnected into an intermediate medium loop.
In some embodiments, the cooling tower may be configured as a wet evaporation air cooler including ammonia decarbonization recycle liquid inlet and outlet and heat exchange components.
In some embodiments, the ammonia decarbonization system can further comprise a refrigerator configured to extract heat from the ammonia decarbonization device. The refrigerator may be used as a supplement to the cooling tower.
In some embodiments, the chiller may be configured to provide cooling to the cooling tower and thereby indirectly extract heat from the ammonia decarbonization device.
In some embodiments, the chiller may provide refrigeration to an ammonia decarbonization device in parallel with the cooling tower.
In some embodiments, the refrigerator may be a compression refrigerator or an absorption refrigerator, or any other suitable form of refrigerator.
In some embodiments, the zones of the ammonia decarbonization device can be implemented in a single column or can be implemented in multiple separate columns.
In some embodiments, the cooling function zone may be implemented in a first column, the ammonium bicarbonate generation zone and carbon dioxide absorption zone may be implemented in a second column, and the ammonia removal function zone may be implemented in a third column.
In some embodiments, in the second column, the carbon dioxide absorption zone may be separated from the ammonium bicarbonate generation zone by a liquid trap that allows passage of gas above the ammonium bicarbonate generation zone.
In some embodiments, the cooling function and the ammonia removal function may be connected by a conduit to effect replenishment of solution from the cooling function to the ammonia removal function.
In some embodiments, the ammonium bicarbonate generation zone and the carbon dioxide absorption zone may be connected by a conduit to effect replenishment of the solution from the carbon dioxide absorption zone to the ammonium bicarbonate generation zone.
In some embodiments, the cooling tower may be connected to at least one of the cooling function zone, the ammonium bicarbonate generation zone, and the carbon dioxide absorption zone, respectively, such that the cooling tower is configured to extract heat from the at least one zone.
In some embodiments, the cooling function zone, the ammonium bicarbonate generation zone, and the carbon dioxide absorption zone may be connected in parallel with a common cooling tower.
In some embodiments, the cooling function region, the ammonium bicarbonate generating region, the carbon dioxide absorbing region and the ammonia removal function region may be provided with at least one layer of circulating liquid distributor, and/or the ammonium bicarbonate generating region may be provided with at least one layer of gas-liquid distributor, respectively.
In some embodiments, the gas-liquid distributor may be selected from bubbling, liquid distribution spraying, or a combination thereof.
The technical features mentioned above, the technical features to be mentioned below and the technical features shown in the drawings alone may be arbitrarily combined with each other as long as the combined technical features are not contradictory. All possible combinations of features are specifically described herein. Any one of the plurality of sub-features contained in the same sentence may be applied independently, and not necessarily with other sub-features.
Drawings
The utility model will now be described in more detail by means of exemplary embodiments with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of an ammonia desulfurization decarbonization system in accordance with an exemplary embodiment of the present utility model.
The reference numerals in the drawings are as follows:
the process gas 1, the cooling function area 2, the cooling circulation pump 3, the heat exchanger 4, the ammonium bicarbonate generating area 5, the liquid collector 6, the carbon dioxide absorbing area 7, the heat exchanger 8, the circulation pump 9, the circulation pump 10, the heat exchanger 11, the crystallization equipment 12, the solid-liquid separation equipment 13, the ammonium bicarbonate fertilizer 14, the ammonia removal function area 15, the clean flue gas 16, the circulation pump 17, the mother liquor return pipe 18, the ammonia adding equipment 19, ammonia 20, the ammonium bicarbonate discharge pump 21, the cooling tower 22, the ammonia desulfurization device 23, the ammonium sulfate fertilizer 24 and the refrigerator 25.
Detailed Description
FIG. 1 is a schematic diagram of an ammonia desulfurization decarbonization system in accordance with an exemplary embodiment of the present utility model. The ammonia desulfurization and decarbonization system comprises an ammonia desulfurization device 23 and an ammonia decarbonization device downstream of the ammonia desulfurization device 23. In an embodiment not shown, a desulfurization device, for example an ammonia desulfurization device, may not be provided upstream of the ammonia decarbonization device, and thus a pure ammonia decarbonization system is formed. Ammonia desulfurization units per se may be known in the art and are therefore not described in more detail herein. The process gas 1, for example, originates from a coal-fired boiler of a thermal power plant and contains mainly pollutionSubstance SO 2 And CO 2 . The SO of the process gas 1 is removed by an ammonia desulfurization device 23 2 Thereafter, as a CO-containing agent 2 The flue gas is conveyed to an ammonia decarburization device. The ammonia desulfurization device 23 can obtain a byproduct ammonium sulfate fertilizer 24.
The ammonia decarbonization device can sequentially comprise a cooling functional zone 2, an ammonium bicarbonate generating zone 5, a carbon dioxide absorbing zone 7 and an ammonia removing functional zone 15 along the flow direction of the flue gas. The cooling function 2 can be realized here by a separate first column. The ammonium bicarbonate generating zone 5 and the carbon dioxide absorbing zone 7 are implemented in one second tower, in which the carbon dioxide absorbing zone 7 is separated from the ammonium bicarbonate generating zone 5 above the ammonium bicarbonate generating zone 5 by a liquid trap 6 allowing passage of gas. The ammonia removal function 15 can be realized by a third column.
Containing CO 2 First enters the cooling function 2. The flue gases are contacted in the cooling function 2 with the circulating liquid sprayed in countercurrent and thus cooled. The circulating liquid may be process water. In order to form a cooling liquid circuit for the cooling function region 2, a circuit line can be provided outside the first tower, on which circuit line a cooling circuit pump 3 and a heat exchanger 4 are arranged. The heat exchanger 4 is connected to a cooling tower 22, which will be described in more detail later. In the cooling function 2, for example, two circulation liquid distributors can be provided, by means of which the circulation liquid is sprayed downwards against the upwardly flowing flue gases for cooling the flue gases. The temperature of the flue gas in the cooling function zone 2 may be controlled between 5 and 40 c, preferably between 8 and 30 c, for example about 18 c.
After cooling in the cooling function zone 2, the flue gas enters the ammonium bicarbonate generating zone 5 through the flue. Here, the flue gas contacts the circulating liquid sprayed in countercurrent to generate chemical reaction to generate ammonium bicarbonate. The circulating liquid circulates through the circulating pump 9, and the circulating liquid is cooled through the heat exchanger 8. The heat exchanger 8 is connected to a cooling tower 22, which will be described in more detail later. A layer of circulating liquid spray thrower may be provided in the ammonium bicarbonate generating zone 5. In the ammonium bicarbonate generating zone 5, in the circulating liquid, total ammonia and total CO 2 The molar ratio of (2) can be controlled to 1 to 3, preferably 1 to 2, for example 1.21.4. The total ammonia may include ammonia and ammonium salts. The total CO 2 May include free CO 2 And carbonizing CO 2 . The temperature of the circulating liquid may be controlled to 10 to 25 ℃, for example, about 15 ℃.
After leaving the ammonium bicarbonate generating zone 5 through the liquid trap 6, the flue gas enters a carbon dioxide absorbing zone 7. In the carbon dioxide absorption zone 7, CO in the flue gas 2 Reacts with absorbent ammonia in the circulating liquid to generate ammonium carbonate or ammonium carbamate. For this purpose, the carbon dioxide absorption zone 7 is provided with an ammonia adding device 19 for adding ammonia 20 to the carbon dioxide absorption zone 7. Ammonia plant 19 may be an ammonia tank and ammonia 20 may be 99.8wt% liquid ammonia. The circulating liquid circulates through the circulating pump 10, and the circulating liquid is cooled through the heat exchanger 11. The heat exchanger 11 is connected to a cooling tower 22, which will be described in more detail later. A two-layer circulating liquid spray may be provided in the carbon dioxide absorption zone 7. The circulating liquid in the carbon dioxide absorption zone 7 may partly flow to the ammonium bicarbonate generation zone 5 through a pipe as schematically depicted in fig. 1 but not provided with reference numerals in order to achieve a solution replenishment from the carbon dioxide absorption zone 7 to the ammonium bicarbonate generation zone 5. In the carbon dioxide absorption zone 7, total ammonia and total CO in the circulating liquid 2 The molar ratio of (2) may be controlled to be 1.2 to 4.5, preferably 1.4 to 3.5, for example 1.5 to 2.5. The temperature of the circulating liquid may be controlled to 20 to 30 ℃, for example, about 25 ℃.
After leaving the carbon dioxide absorption zone 7, the flue gas enters an ammonia removal functional zone 15. Here the flue gas is contacted with a circulating liquid sprayed counter-currently to absorb free ammonia from the flue gas. The clean flue gas 16 after free ammonia removal can reach the emission standard. The circulating liquid is circulated by a circulating pump 17. A layer of circulating liquid spray can be arranged in the ammonia removal functional region 15. Advantageously, the ammonia removal function region 15 can be supplemented with solution from the cooling function region 2 by means of the cooling circulation pump 3 of the cooling function region 2. In the cooling function 2, condensed water can be effectively recovered from the flue gas having a higher temperature by means of cooling measures, the condensed water thus recovered can be used as a make-up liquid, and thus the ammonia decarbonization system according to the utility model, in particular the ammonia decarbonization system integrated with an ammonia desulfurization device, i.e. the ammonia desulfurization decarbonization system, can be operated in a particularly water-saving manner.
The circulating liquid from the ammonium bicarbonate generation zone 5 may be pumped into the ammonium bicarbonate treatment system by ammonium bicarbonate discharge pump 21 to produce solid ammonium bicarbonate fertilizer 14. The ammonium bicarbonate treatment system may include a crystallization device 12 and a solid-liquid separation device 13. The mother liquor separated by the solid-liquid separation device 13 may be returned to the carbon dioxide absorption zone 7 through a mother liquor return pipe 18.
In the exemplary embodiment shown in fig. 1, the cooling tower 22 is connected to three sections of the ammonia decarbonization device, namely, the cooling function section 2, the ammonium bicarbonate generating section 5 and the carbon dioxide absorbing section 7, respectively, for extracting heat from the circulating liquid of the three sections, and realizing the corresponding temperature control of the three sections. In an embodiment not shown, the cooling tower 22 may be assigned to only one of the three zones or instead to two of the three zones, for example to the cooling function zone 2 and the ammonium bicarbonate generation zone 5.
In the exemplary embodiment shown in fig. 1, the cooling tower 22 is configured as an open cooling tower, which comprises a circulating coolant outlet and inlet, and the three zones of the ammonia decarbonization device are each provided with one heat exchanger 4, 8, 11, each comprising a circulating coolant outlet and inlet and an ammonia decarbonization recycle liquid outlet and inlet. The circulating coolant outlet and inlet of the cooling tower 22 may be suitably connected with the circulating coolant inlet and outlet of the corresponding heat exchanger, forming three parallel coolant loops. The coolant in the coolant loop may be water or may be a mixture of water and ethylene glycol, preferably 90wt% water +10wt% ethylene glycol. In this case, the cooling tower 22 may have separate inputs for separately filling the cooling tower with water and glycol, or the cooling tower 22 may have a common input for filling the cooling tower with water and glycol. The outlet and inlet of the ammonia decarbonization recycle liquid of each heat exchanger 4, 8, 11 are connected to the recycle line of the recycle liquid of the corresponding zone of the ammonia decarbonization device, preferably downstream of the corresponding recycle pump 3, 9, 10.
In addition to the cooling tower 22, the ammonia decarbonization system may further comprise a refrigerator 25, the refrigerator 25 being configured for directly or indirectly extracting heat from the ammonia decarbonization device. The refrigerator 25 may be a compression refrigerator or an absorption refrigerator. As shown in fig. 1, the refrigerator 25 is connected in parallel with the cooling tower 22. The refrigerator 25 may operate in parallel with the cooling tower 22. When in winter or when the ambient temperature is below 10 c, the refrigerator 25 may be completely turned off, and the corresponding temperature control of the three zones of the ammonia decarbonization device is achieved by simply operating the cooling tower 22.
In an embodiment not shown, the refrigerator 25 may be configured to extract heat from the cooling tower 22, and thus the refrigerator 25 may extract heat from the cooling tower 22 along with the cooling tower 22. In another embodiment, not shown, the refrigerator 25 may be configured to extract heat from one of the three zones of the ammonia decarbonization device, while the cooling tower 22 may be configured to extract heat from the other two of the three zones of the ammonia decarbonization device.
Instead of an open cooling tower, the cooling tower 22 may be a closed cooling tower. The closed cooling tower may include a circulating coolant outlet and inlet, the circulating coolant loop including a first heat exchanger including a circulating coolant outlet and inlet and an intermediate medium outlet and inlet. The ammonia decarburization device is provided with a second heat exchanger, the second heat exchanger comprises an intermediate medium outlet and an intermediate medium inlet, and an ammonia decarburization circulating liquid outlet and an ammonia decarburization circulating liquid inlet, and the first heat exchanger and the second heat exchanger are mutually connected to form an intermediate medium loop. In this variant, the cooling tower 22 forms a coolant circuit with the respective first heat exchanger, the second heat exchanger forms a solution circuit of the circulating liquid with the respective zone of the ammonia decarbonization device, the coolant circuit extracts heat from the intermediate medium circuit, and the intermediate medium circuit extracts heat from the solution circuit of the hot circulating liquid. Instead of the open cooling tower and the closed cooling tower, the cooling tower 22 may be configured as a wet evaporation air cooler. The wet evaporation air cooler comprises an ammonia decarburization circulating liquid inlet and outlet and a heat exchange component.
It is noted that the terminology used herein is for the purpose of describing particular aspects only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be understood that the terms "comprises" and "comprising," and other similar terms, when used in this specification, specify the presence of stated operations, elements, and/or components, but do not preclude the presence or addition of one or more other operations, elements, components, and/or groups thereof. The term "and/or" as used herein includes all arbitrary combinations of one or more of the associated listed items. In the description of the drawings, like reference numerals always denote like elements.
It will be understood that, although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. Thus, a first element could be termed a second element without departing from the teachings of the present application.
Finally, it is pointed out that the above embodiments are only for the understanding of the present application and do not limit the scope of protection of the present application. Modifications to the above would be obvious to those of ordinary skill in the art, but would not bring the utility model so modified beyond the scope of the present application.
Claims (17)
1. An ammonia decarbonization system, comprising an ammonia decarbonization device and a cooling tower, wherein the cooling tower (22) is connected with the ammonia decarbonization device, and the ammonia decarbonization device sequentially comprises a cooling function area (2), an ammonium bicarbonate generating area (5), a carbon dioxide absorbing area (7) and an ammonia removing function area (15) along the flow direction of flue gas, and the ammonia decarbonization device is configured to absorb CO from a carbon dioxide containing area with an ammonia absorbent 2 CO removal from flue gas of (2) 2 To produce ammonium bicarbonate, the cooling tower configured to extract heat from the ammonia decarbonization device.
2. The ammonia decarbonizing system according to claim 1, characterized in that the ammonia decarbonizing device is connected to an ammonia desulfurization device (23) upstream of the ammonia decarbonizing device such that the ammonia decarbonizing system is supplemented as an ammonia desulfurization decarbonizing system, wherein the ammonia desulfurization device is configured for absorbing SO from the content with ammonia absorbent 2 And CO 2 Is used for removing SO from flue gas of (1) 2 To produce ammonium sulfate.
3. The ammonia decarbonizing system according to claim 1 or 2, wherein the cooling tower uses water as a circulating coolant, wherein the cooling tower has an input for filling the cooling tower with water.
4. The ammonia decarbonizing system according to claim 1 or 2, wherein the cooling tower has a mixture of water and ethylene glycol as a circulating coolant, wherein the cooling tower has a separate input for separately filling the cooling tower with water and ethylene glycol, or the cooling tower has a common input for filling the cooling tower with water and ethylene glycol.
5. The ammonia decarbonization system of claim 1 or 2, wherein the cooling tower is configured as an open cooling tower comprising a circulating coolant outlet and inlet, and the ammonia decarbonization device is configured with a heat exchanger comprising a circulating coolant outlet and inlet and an ammonia decarbonization recycle fluid outlet and inlet.
6. The ammonia decarbonizing system according to claim 1 or 2, characterized in that the cooling tower is configured as a closed cooling tower comprising a circulating coolant outlet and inlet, the circulating coolant circuit comprising a first heat exchanger comprising a circulating coolant outlet and inlet and an intermediate medium outlet and inlet, the ammonia decarbonizing device being provided with a second heat exchanger comprising an intermediate medium outlet and inlet and an ammonia decarbonizing liquid outlet and inlet, the first heat exchanger and the second heat exchanger being connected to each other into an intermediate medium circuit.
7. The ammonia decarbonizing system according to claim 1 or 2, wherein the cooling tower is configured as a wet evaporation air cooler including an ammonia decarbonizing circulating liquid inlet and outlet and a heat exchanging member.
8. Ammonia decarbonizing system according to claim 1 or 2, characterized in that it further comprises a refrigerator (25) configured for extracting heat from the ammonia decarbonizing device.
9. The ammonia decarbonizing system of claim 8 wherein the chiller is connected in parallel with the cooling tower.
10. The ammonia decarbonizing system of claim 8 wherein the refrigerator is a compression refrigerator or an absorption refrigerator.
11. The ammonia decarbonizing system of claim 1 or 2, wherein the individual zones of the ammonia decarbonizing device are implemented in one single column or in a plurality of separate columns.
12. The ammonia decarbonizing system according to claim 1 or 2, characterized in that the cooling function zone is implemented in a first tower, the ammonium bicarbonate generation zone and the carbon dioxide absorption zone are implemented in a second tower, and the ammonia removal function zone is implemented in a third tower, in which second tower the carbon dioxide absorption zone is separated from the ammonium bicarbonate generation zone by a liquid trap (6) that allows passage of gas above the ammonium bicarbonate generation zone.
13. The ammonia decarbonization system of claim 1 or 2, wherein the cooling zone is connected to the ammonia removal zone by a conduit to provide a replenishment of solution from the cooling zone to the ammonia removal zone.
14. The ammonia decarbonizing system according to claim 1 or 2, wherein the ammonium bicarbonate generating zone and the carbon dioxide absorbing zone are connected by a pipe to realize the replenishment of the solution from the carbon dioxide absorbing zone to the ammonium bicarbonate generating zone.
15. The ammonia decarbonizing system according to claim 1 or 2, wherein the cooling tower is connected to at least one zone among a cooling function zone, an ammonium bicarbonate generation zone, and a carbon dioxide absorption zone, respectively, such that the cooling tower is configured to extract heat from the at least one zone.
16. The ammonia decarbonizing system of claim 15 wherein the cooling function zone, the ammonium bicarbonate generation zone and the carbon dioxide absorption zone are connected in parallel with a common cooling tower.
17. The ammonia decarbonizing system according to claim 1 or 2, wherein the cooling function region, the ammonium bicarbonate generating region, the carbon dioxide absorbing region and the ammonia removing function region are respectively provided with at least one layer of circulating liquid distributor, and the ammonium bicarbonate generating region is provided with at least one layer of gas-liquid distributor.
Priority Applications (1)
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