Industrial flue gas carbon dioxide enrichment extraction device

Abstract

The utility model provides a kind of industrial flue gas carbon dioxide enrichment extraction device, belong to industrial flue gas processing technical field.The extraction device, including preprocessing unit, wherein preprocessing unit is provided with industrial flue gas inlet, to input industrial flue gas and carry out preprocessing, its export is connected with the inlet of primary enrichment unit, primary enrichment unit is used to carry out first carbon dioxide enrichment in the industrial flue gas after preprocessing, its export is connected with the inlet of secondary enrichment unit, secondary enrichment unit is used to carry out second carbon dioxide enrichment to the industrial flue gas after first carbon dioxide enrichment, its export is connected with the inlet of purification unit, purification unit is used to carry out purification to the industrial flue gas after second carbon dioxide enrichment, its export is connected with the inlet of storage unit, storage unit is used to store after the gas of purification, can realize to the carbon dioxide in the industrial flue gas of discharge second enrichment purification treatment, realize the recovery of carbon dioxide.

Description

Technical Field

[0001] This utility model relates to the field of industrial flue gas treatment technology, and more specifically, to an industrial flue gas carbon dioxide enrichment and extraction device. Background Technology

[0002] In the industrial sector, low concentrations of carbon dioxide (CO2) in industrial flue gas have become an overlooked source of pollution. Taking coal-fired power plants as an example, although the CO2 concentration in flue gas is only 12%-15%, these seemingly low concentrations of CO2 still result in annual emissions exceeding one million tons per unit. The destructive power of CO2 emissions accumulating in large quantities to the ecological environment should not be underestimated.

[0003] At the same time, carbon dioxide is not simply waste, but a carbon resource with great development potential. However, in the industrial sector, due to its low emission concentration and the difficulty of capture, the resource utilization rate of carbon dioxide is extremely low. Large amounts of low-concentration carbon dioxide are directly released into the atmosphere without effective utilization, which not only causes a huge waste of valuable carbon resources, but also damages the ecological environment. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides an industrial flue gas carbon dioxide enrichment and extraction device, which can perform secondary enrichment and purification treatment on the carbon dioxide in the emitted industrial flue gas, thereby realizing the recovery of carbon dioxide.

[0005] This utility model is implemented as follows: An industrial flue gas carbon dioxide enrichment and extraction device includes a pretreatment unit, wherein the pretreatment unit is provided with an industrial flue gas inlet for inputting industrial flue gas for pretreatment, its outlet is connected to the inlet of a primary enrichment unit for performing a first carbon dioxide enrichment on the pretreated industrial flue gas, its outlet is connected to the inlet of a secondary enrichment unit for performing a second carbon dioxide enrichment on the industrial flue gas after the first carbon dioxide enrichment, its outlet is connected to the inlet of a purification unit for purifying the industrial flue gas after the second carbon dioxide enrichment, and its outlet is connected to the inlet of a storage unit for storing the purified gas.

[0006] In one embodiment of this utility model, the pretreatment unit includes a dust collector a, the inlet of which is connected to industrial flue gas, and its outlet is connected to the inlet of a cooler a. The outlet of the cooler a is connected to the inlet of a desulfurizer, the outlet of the desulfurizer is connected to the inlet of a denitrification unit, and the outlet of the denitrification unit is connected to the inlet of a filter.

[0007] In one embodiment of the present invention, the primary enrichment unit includes a compressor a, the inlet of which is connected to the outlet of the filter, and the outlet of the compressor a is connected in series with membrane module a, membrane module b, and membrane module c.

[0008] In one embodiment of this utility model, the secondary enrichment unit includes an adsorption bed, and the inlet of the adsorption bed is connected in series with a dehydrator a, a cooler b and a dust collector b, wherein the inlet of the dust collector b is connected to the outlet of the membrane module c.

[0009] In one embodiment of the present invention, the storage unit includes a compressor b, and the outlet of the compressor b is connected in series with an intercooler, a dehydrator b, and a gas storage tank.

[0010] In one embodiment of this utility model, the purification unit includes a polishing tower, the inlet of which is connected to the outlet of the adsorption bed, and the outlet of which is connected to the inlet of the compressor b.

[0011] In one embodiment of this utility model, the purification unit includes an amine washing tower, the inlet of which is connected to the outlet of the adsorption bed, and the outlet of which is connected to the inlet of compressor b.

[0012] In one embodiment of this utility model, the purification unit includes a liquefaction device, the inlet of which is connected to the outlet of the adsorption bed, and the outlet of which is connected to the inlet of the compressor b.

[0013] In one embodiment of this utility model, the purification unit includes a purification membrane, the inlet of which is connected to the outlet of the adsorption bed, and the outlet of which is connected to the inlet of the compressor b.

[0014] In one embodiment of this utility model, the purification unit includes a polishing tower, an amine washing tower, a liquefaction device, and a fine separation membrane. The inlets of the polishing tower, the amine washing tower, the liquefaction device, and the fine separation membrane are respectively connected to the outlet of the adsorption bed, and the inlets of the polishing tower, the amine washing tower, the liquefaction device, and the fine separation membrane are respectively equipped with valves.

[0015] The beneficial effects of this utility model are as follows: The industrial flue gas carbon dioxide enrichment and extraction device obtained by the above design adopts a two-stage enrichment method of membrane separation and adsorption bed. The membrane separation is responsible for high-flow pre-enrichment, and the adsorption bed is used for deep purification, so as to realize the extraction and recovery of low-concentration carbon dioxide in industrial flue gas. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of the industrial flue gas carbon dioxide enrichment and extraction device provided for an embodiment of this utility model.

[0018] In the diagram: 1. Pretreatment unit; 11. Dust collector a; 12. Cooler a; 13. Desulfurizer; 14. Denitrifier; 15. Filter; 2. Primary enrichment unit; 21. Compressor a; 22. Membrane module a; 23. Membrane module b; 24. Membrane module c; 3. Secondary enrichment unit; 31. Dust collector b; 32. Cooler b; 33. Dehydrator a; 34. Adsorption bed; 4. Purification unit; 41. Polishing tower; 42. Amine washing tower; 43. Liquefaction equipment; 44. Fine separation membrane; 5. Storage unit; 51. Compressor b; 52. Intercooler; 53. Dehydrator b; 54. Gas storage tank. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] Figure 1 The structure of the industrial flue gas carbon dioxide enrichment and extraction device provided by the present invention is shown, which includes a pretreatment unit 1, a primary enrichment unit 2, a secondary enrichment unit 3, a purification unit 4, and a storage unit 5.

[0022] Pretreatment unit 1 is equipped with an industrial flue gas inlet for inputting industrial flue gas for pretreatment. Pretreatment unit 1 is used to remove or reduce particulate matter, droplets, liquid impurities, SO2, NOx, and excess moisture in the raw industrial flue gas. Pretreatment unit 1 includes a dust collector a11, whose inlet is connected to the industrial flue gas, and whose outlet is connected to the inlet of a cooler a12. The outlet of cooler a12 is connected to the inlet of a desulfurizer 13, the outlet of desulfurizer 13 is connected to the inlet of a denitrification unit 14, and the outlet of denitrification unit 14 is connected to the inlet of a filter 15. Wherein: Dust collector a11 is used to remove dust, fly ash and other particles from industrial flue gas; cooler a12 is used to reduce the temperature of industrial flue gas; desulfurizer 13 is used to remove sulfur dioxide from industrial flue gas; denitrifier 14 is used to remove nitrogen oxides from industrial flue gas; filter 15 is used to remove mist droplets, micro-droplets and residual oil mist, as well as small liquid phase impurities from industrial flue gas.

[0023] The dust collector a11, cooler a12, desulfurizer 13, denitrifier 14, and filter 15 mentioned above all adopt existing technologies. Those skilled in the art can select dust collector a11, cooler a12, desulfurizer 13, denitrifier 14, and filter 15 with different parameters according to actual needs to achieve the above-mentioned pretreatment process of industrial flue gas.

[0024] The outlet of pretreatment unit 1 is connected to the inlet of primary enrichment unit 2. Primary enrichment unit 2 is used to perform the first carbon dioxide enrichment on the pretreated industrial flue gas. Primary enrichment unit 2 includes compressor a21, whose inlet is connected to the outlet of filter 15. Membrane module a22, membrane module b23, and membrane module c24 are connected in series at the outlet of compressor a21. Compressor a21 is used to draw in the flue gas treated by pretreatment unit 1 and input it to membrane modules a22 to c24 for further treatment; module a is used to perform the first filtration of the flue gas; membrane module b23 is used to perform the second filtration of the flue gas after the first filtration; membrane module c24 is used to perform the third filtration of the flue gas after the second filtration.

[0025] Membrane modules a22 to c24 perform stepwise separation of flue gas through a selective permeation mechanism to achieve multi-stage enrichment of carbon dioxide, achieving the first enrichment. Among them, the selectivity and separation precision of membrane modules a22 to c24 increase sequentially. Membrane module a22 can be a polysulfone / polyimide hollow fiber membrane or other membrane materials that can achieve the same function, used for preliminary selective separation of flue gas, enriching CO2 to a medium concentration. Membrane module b23 can be a polyamide composite membrane or other membrane materials that can achieve the same function, used to further increase the concentration of CO2 in the permeate and reduce the content of N2 and O2. Membrane module c24 can be a polyimide / polydimethylsiloxane composite membrane or cellulose acetate membrane or other membrane materials that can achieve the same function, used for highly selective enrichment of CO2, producing high-concentration CO2 permeate.

[0026] The compressor a21, membrane module a22, membrane module b23, and membrane module c24 mentioned above all adopt existing technologies. Those skilled in the art can select compressor a21, membrane module a22, membrane module b23, and membrane module c24 with different parameters according to actual needs to achieve the above-mentioned first carbon dioxide enrichment and purification process of industrial flue gas.

[0027] The outlet of the primary enrichment unit 2 is connected to the inlet of the secondary enrichment unit 3. The secondary enrichment unit 3 is used to perform a second carbon dioxide enrichment and purification on the industrial flue gas that has undergone the first carbon dioxide enrichment. The secondary enrichment unit 3 includes an adsorption bed 34, in which a dehydrator a33, a cooler b32, and a dust collector b31 are connected in series at the inlet of the adsorption bed 34. The inlet of the dust collector b31 is connected to the outlet of the membrane module c24. The dehydrator a33, cooler b32, and dust collector b31 are used to protect the adsorption bed 34. The dust collector b31 is used to remove particulate matter from the gas, the cooler b32 is used to reduce the temperature of the gas entering the adsorption bed 34, and the dehydrator is used to reduce the water content of the gas entering the adsorption bed 34. The adsorption bed 34 selectively adsorbs carbon dioxide using an adsorbent. Regeneration is achieved by releasing CO2 through pressure reduction (VPSA) or heating (TVSA) to obtain concentrated carbon dioxide gas.

[0028] The dust collector b31, cooler b32, dehydrator a33 and adsorption bed 34 mentioned above all adopt existing technology. Those skilled in the art can select dust collector b31, cooler b32, dehydrator a33 and adsorption bed 34 with different parameters according to actual needs to achieve the above-mentioned second carbon dioxide enrichment and purification process of industrial flue gas.

[0029] The outlet of the secondary enrichment unit 3 is connected to the inlet of the purification unit 4, which is used to purify the industrial flue gas after the second carbon dioxide enrichment.

[0030] Purification unit 4 can be implemented using the following embodiments: Example 1: The purification unit 4 includes a polishing tower 41. The inlet of the polishing tower 41 is connected to the outlet of the adsorption bed 34, and the outlet of the polishing tower 41 is connected to the inlet of the compressor b51.

[0031] Example 2: Purification unit 4 includes amine washing tower 42. The inlet of amine washing tower 42 is connected to the outlet of adsorption bed 34, and the outlet of amine washing tower 42 is connected to the inlet of compressor b51.

[0032] Example 3: The purification unit 4 includes a liquefaction device 43. The inlet of the liquefaction device 43 is connected to the outlet of the adsorption bed 34, and the outlet of the liquefaction device 43 is connected to the inlet of the compressor b51.

[0033] Example 4: The purification unit 4 includes a purification membrane 44, the inlet of which is connected to the outlet of the adsorption bed 34, and the outlet of which is connected to the inlet of the compressor b51.

[0034] Example 5: The purification unit 4 includes a polishing tower 41, an amine washing tower 42, a liquefaction device 43, and a fine separation membrane 44. The inlets of the polishing tower 41, the amine washing tower 42, the liquefaction device 43, and the fine separation membrane 44 are respectively connected to the outlet of the adsorption bed 34. Valves are provided at the inlets of the polishing tower 41, the amine washing tower 42, the liquefaction device 43, and the fine separation membrane 44.

[0035] In the above Examples 1 to 4, the selection can be made according to the required carbon dioxide gas concentration. Specifically, in Example 1, after treatment by polishing tower 41, the target carbon dioxide gas concentration obtained is 95-98% (depending on the process); in Example 2, after treatment by amine washing tower 42, the target carbon dioxide gas concentration obtained is >99% (depending on the process); in Example 3, after treatment by liquefaction equipment 43, CO2 is liquefied and separated by low-temperature condensation / compression to obtain liquid carbon dioxide, and other gases are removed in this process; in Example 4, after treatment by fine separation membrane 44, the target carbon dioxide gas concentration obtained is 95-99% (depending on the process).

[0036] The process of purifying carbon dioxide using polishing tower 41, amine washing tower 42, liquefaction equipment 43, and purification membrane 44 in the above embodiments 1 to 4 is based on existing technology. The specific working principle will not be described in detail here. Those skilled in the art can select and use the parameters of polishing tower 41, amine washing tower 42, liquefaction equipment 43, and purification membrane 44 based on the disclosed existing technology.

[0037] In Example 5, the valve allows for selection of which device to introduce the gas after the second carbon dioxide enrichment and purification into, thereby achieving the effect of adjusting the output carbon dioxide concentration or state according to requirements.

[0038] The outlet of purification unit 4 is connected to the inlet of storage unit 5. Storage unit 5 is used to store the purified gas. Storage unit 5 includes compressor b51. The outlet of compressor b51 is connected in series with intercooler 52, dehydrator b53 and gas storage tank 54.

[0039] The compressor b51, intercooler 52, dehydrator b53, and gas storage tank 54 mentioned above all adopt existing technology. Those skilled in the art can select compressor b51, intercooler 52, dehydrator b53, and gas storage tank 54 with different parameters according to actual needs to achieve the above-mentioned storage of carbon dioxide. Among them, the intercooler 52 is used to reduce the heat load after compression and remove condensate, the dehydrator b53 can use molecular sieve or membrane dryer to remove moisture from the gas, and the compressor b51 is used to input the gas into the gas storage tank 54 for storage.

[0040] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An industrial flue gas carbon dioxide enrichment and extraction device, characterized in that: The system includes a pretreatment unit (1), which is provided with an industrial flue gas inlet for inputting industrial flue gas for pretreatment. Its outlet is connected to the inlet of a primary enrichment unit (2), which is used to perform the first carbon dioxide enrichment on the pretreated industrial flue gas. Its outlet is connected to the inlet of a secondary enrichment unit (3), which is used to perform the second carbon dioxide enrichment on the industrial flue gas after the first carbon dioxide enrichment. Its outlet is connected to the inlet of a purification unit (4), which is used to purify the industrial flue gas after the second carbon dioxide enrichment. Its outlet is connected to the inlet of a storage unit (5), which is used to store the purified gas.

2. The extraction device according to claim 1, characterized in that, The pretreatment unit (1) includes a dust collector a (11), the inlet of which is connected to industrial flue gas, and its outlet is connected to the inlet of a cooler a (12). The outlet of the cooler a (12) is connected to the inlet of a desulfurizer (13), the outlet of the desulfurizer (13) is connected to the inlet of a denitrifier (14), and the outlet of the denitrifier (14) is connected to the inlet of a filter (15).

3. The extraction device according to claim 2, characterized in that, The primary enrichment unit (2) includes a compressor a (21), whose inlet is connected to the outlet of the filter (15), and the outlet of the compressor a (21) is connected in series with membrane module a (22), membrane module b (23) and membrane module c (24).

4. The extraction device according to claim 3, characterized in that, The secondary enrichment unit (3) includes an adsorption bed (34), and the inlet of the adsorption bed (34) is connected in series with a dehydrator a (33), a cooler b (32) and a dust collector b (31), wherein the inlet of the dust collector b (31) is connected to the outlet of the membrane module c (24).

5. The extraction device according to claim 1, characterized in that, The storage unit (5) includes a compressor b (51), and the outlet of the compressor b (51) is connected in series with an intercooler (52), a dehydrator b (53) and a gas storage tank (54).

6. The extraction device according to claim 5, characterized in that, The purification unit (4) includes a polishing tower (41), the inlet of which is connected to the outlet of the adsorption bed (34), and the outlet of which is connected to the inlet of the compressor b (51).

7. The extraction device according to claim 5, characterized in that, The purification unit (4) includes an amine washing tower (42), the inlet of which is connected to the outlet of the adsorption bed (34), and the outlet of which is connected to the inlet of the compressor b (51).

8. The extraction device according to claim 5, characterized in that, The purification unit (4) includes a liquefaction device (43), the inlet of which is connected to the outlet of the adsorption bed (34), and the outlet of which is connected to the inlet of the compressor b (51).

9. The extraction device according to claim 5, characterized in that, The purification unit (4) includes a purification membrane (44), the inlet of which is connected to the outlet of the adsorption bed (34), and the outlet of which is connected to the inlet of the compressor b (51).

10. The extraction device according to claim 5, characterized in that, The purification unit (4) includes a polishing tower (41), an amine washing tower (42), a liquefaction device (43), and a purification membrane (44). The inlets of the polishing tower (41), the amine washing tower (42), the liquefaction device (43), and the purification membrane (44) are respectively connected to the outlet of the adsorption bed (34). The inlets of the polishing tower (41), the amine washing tower (42), the liquefaction device (43), and the purification membrane (44) are respectively equipped with valves.

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