Flue gas low-temperature purification plant

Abstract

The present application relates to the technical field of low-temperature flue gas purification and discloses a flue gas low-temperature purification device, which comprises a spray tower, a cooling tower, a first heat exchanger and a plurality of circulating pipelines. The spray tower comprises a plurality of spray sections arranged in sequence along the flow direction of flue gas, the plurality of spray sections are used for spraying and cooling the flue gas into low-temperature flue gas with subzero temperature, the plurality of circulating pipelines correspond to the plurality of spray sections one by one, so that the spray liquid in one spray section circulates between the corresponding one circulating pipeline, the liquid inlet of the cooling tower is connected to the liquid outlet of at least one of the plurality of circulating pipelines, the first heat exchanger is used for exchanging heat between the spray liquid and air, and the cooled cooling medium is introduced into the cooling tower to exchange heat with the spray liquid that enters the cooling tower through the liquid inlet of the cooling tower and is sprayed. The flue gas low-temperature purification device has the advantages that the spray liquid discharged from the spray tower is subjected to twice heat exchange and cooling, the cooling effect is good, the consumption of electric energy is reduced, and the economic efficiency is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of low-temperature flue gas purification, in particular to a flue gas low-temperature purification device. BACKGROUND

[0002] Coal-fired flue gas has many pollutants, and before the flue gas is discharged, the flue gas needs to be treated accordingly, such as cooling and dust removal, desulfurization and denitrification.

[0003] In the related art, the flue gas generated by the coal-fired boiler is introduced into the spray tower for spray cooling, dust removal, desulfurization and denitrification, and the spray liquid used in the spray tower needs to be recycled, that is, the spray liquid after heat exchange with the flue gas in the spray tower needs to be extracted out of the spray tower and cooled by a refrigerating machine, and then introduced into the spray tower to continue to cool the flue gas. The cold energy generated in this process needs to be supplied by consuming a large amount of electric energy, which is high in energy consumption and poor in economy. SUMMARY

[0004] The present application aims to at least partially solve one of the technical problems in the related art. To this end, an embodiment of the present application proposes a flue gas low-temperature purification device, which has good spray liquid cooling effect, low energy consumption and good economy.

[0005] The flue gas low-temperature purification device of the present application comprises:

[0006] a spray tower, the spray tower comprising a plurality of spray sections arranged in sequence along the flow direction of the flue gas, the plurality of spray sections being used to spray and cool the flue gas introduced into the spray tower into low-temperature flue gas at subzero temperature;

[0007] a plurality of circulation pipelines, the plurality of circulation pipelines corresponding one-to-one to the plurality of spray sections, so that the spray liquid in one of the spray sections circulates between the circulation pipeline corresponding to it;

[0008] a cooling tower, the inlet of the cooling tower being connected to the outlet of at least one of the plurality of circulation pipelines, so as to cool the spray liquid discharged from the outlet of the at least one circulation pipeline and supply the cooled spray liquid to the inlet of the at least one circulation pipeline;

[0009] a first heat exchanger, the first heat exchanger having a first hot-side inlet connected to the outlet of the at least one circulation pipeline, a first hot-side outlet connected to the inlet of the cooling tower, a first cold-side inlet and a first cold-side outlet connected to the inlet of the cooling tower, the spray liquid discharged from the outlet of the at least one circulation pipeline being heat-exchanged with the cooling medium introduced into the first cold-side inlet in the first heat exchanger, and the heat-exchanged cooling medium being introduced into the cooling tower to be heat-exchanged with the spray liquid introduced into the cooling tower through the inlet of the cooling tower.

[0010] The flue gas low-temperature purification device of the present application firstly utilizes air to primary heat exchange and cool the heat-exchanged spray liquid discharged from the spray tower in the first heat exchanger, and the heat-exchanged spray liquid is introduced into the cooling tower to be sprayed and cooled again with air, thereby performing twice heat exchange and cooling of the spray liquid discharged from the spray tower, with good cooling effect and low power consumption, and high economic efficiency.

[0011] Optionally, the flue gas low-temperature purification device of the present application further comprises an adsorption tower and a regeneration tower, the adsorption tower is connected with the flue gas outlet of the spray tower for adsorbing and purifying the low-temperature flue gas discharged from the flue gas outlet into clean flue gas, and the regeneration tower is connected with the adsorption tower for regenerating the adsorbent after adsorption and purification.

[0012] The flue gas low-temperature purification device of the present application utilizes the spray tower to reduce the temperature of the flue gas introduced therein to below 0℃, to ensure that the flue gas introduced into the adsorption tower is low-temperature clean flue gas, and to improve the adsorption effect. The adsorbent in the adsorption tower can be introduced into the regeneration tower for desorption and regeneration of the adsorbent in the regeneration tower.

[0013] Optionally, the adsorption tower has an adsorbent inlet and an adsorbent outlet, the regeneration tower has a regeneration inlet and a regeneration outlet, the adsorbent inlet is connected with the regeneration outlet, and the adsorbent outlet is connected with the regeneration inlet, to circulate the adsorbent between the adsorption tower and the regeneration tower.

[0014] In the flue gas low-temperature purification device of the present application, the adsorbent after adsorption and purification of flue gas in the adsorption tower can enter the regeneration tower through the adsorbent outlet and the regeneration inlet for regeneration, and the regenerated adsorbent in the regeneration tower can enter the adsorption tower through the regeneration outlet and the adsorbent inlet, to adsorb and purify the flue gas in the adsorption tower again, realizing the reuse of the adsorbent.

[0015] Optionally, the cooling tower assembly further comprises a spraying member arranged in the cooling tower and communicating with the liquid inlet of the cooling tower, and the inlet of the cooling tower, the spraying member and the outlet of the cooling tower are arranged in the height direction of the cooling tower from bottom to top in sequence.

[0016] The flue gas low-temperature purification device of the present application sprays the heat-exchanged spray liquid after heat exchange with air through the spraying member, to directly exchange heat with air in the cooling tower, with good heat exchange effect.

[0017] Optionally, the plurality of spray sections are divided into a first spray section and a second spray section in the direction of the flue gas flow, the plurality of circulating pipelines include a first circulating pipeline and a second circulating pipeline, the first circulating pipeline is connected with the first spray section, the second circulating pipeline is connected with the second spray section, the first hot side inlet is connected with the liquid outlet of the first circulating pipeline, and the liquid outlet of the cooling tower is connected with the liquid inlet of the first circulating pipeline.

[0018] The flue gas low-temperature purification equipment of the present application divides the spray tower into multiple spray sections to spray and cool the flue gas entering the spray tower step by step, thereby avoiding the large temperature difference between the spray liquid and the flue gas, affecting the cooling effect, and also avoiding excessive use of resources.

[0019] Optionally, the flue gas low-temperature purification equipment of the present application further includes a refrigerator, the refrigeration inlet of the refrigerator is connected with the liquid outlet of the second circulating pipeline, and the refrigeration outlet of the refrigerator is connected with the liquid inlet of the second circulating pipeline, so as to cool the spray liquid in the second circulating pipeline, and the cooled spray liquid is used to reduce the temperature of the flue gas in the spray tower to below zero.

[0020] Optionally, the refrigerator has a cooling inlet and a cooling outlet, the cooling inlet is connected with the liquid outlet of the cooling tower, so as to cool the refrigerator, and the cooling outlet is connected with the spray member.

[0021] The refrigerator of the flue gas low-temperature purification equipment of the present application generates a certain amount of heat during use, and the spray liquid of the spray tower is used to cool the refrigerator, thereby avoiding the additional cooling equipment and reducing the consumption of additional energy.

[0022] Optionally, the flue gas low-temperature purification equipment of the present application further includes a second heat exchanger, the second heat exchanger has a second hot side inlet connected with the cooling outlet, a second hot side outlet connected with the spray member, a second cold side inlet, and a second cold side outlet connected with the inlet of the cooling tower, the second cold side inlet is used to pass in the cooling medium, so that the spray liquid discharged from the cooling outlet is passed into the cooling tower after heat exchange in the second heat exchanger.

[0023] The flue gas low-temperature purification equipment of the present application uses the second heat exchanger to first cool the spray liquid discharged from the cooling outlet, and then passes the cooled spray liquid into the cooling tower for spray cooling, thereby further improving the cooling effect of the spray liquid.

[0024] Optionally, the flue gas low-temperature purification equipment of the present application further includes a water treatment assembly, the water treatment assembly has a water inlet and a drain outlet, the water inlet is connected with the bottom of the spray tower, and the drain outlet is connected between the liquid outlet of the first circulating pipeline and the first hot side inlet, so as to pass the spray liquid purified by the spray tower into the cooling tower.

[0025] The flue gas low-temperature purification device of the present application utilizes a water treatment assembly to treat the spray liquid discharged from the spray tower, wherein the water treatment includes filtering impurities in the spray liquid, adjusting the pH value of the spray liquid, etc., to weaken the corrosion of the spray liquid to the pipeline.

[0026] Optionally, the water treatment assembly comprises an adjusting member connected between the water inlet and the water outlet, for adjusting the pH value of the spray liquid discharged from the spray tower. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic view of the flue gas low-temperature purification device of the present application.

[0028] Figure 2 is a structural schematic view of the flue gas low-temperature purification device of the present application.

[0029] Figure 3 is a structural schematic view of the flue gas low-temperature purification device of the present application.

[0030] Figure 4 is a sectional structural schematic view of the air-permeable shell of the flue gas low-temperature purification device of the present application.

[0031] REFERENCE SIGNS:

[0032] air-permeable shell 100;

[0033] spray tower 1; first spray section 11; second spray section 12; flue gas inlet 13; flue gas outlet 14;

[0034] first circulation pipeline 21; second circulation pipeline 22;

[0035] cooling tower 3; spray member 31;

[0036] first heat exchanger 4; first hot-side inlet 41; first hot-side outlet 42; first cold-side inlet 43; first cold-side outlet 44;

[0037] second heat exchanger 5; second hot-side inlet 51; second hot-side outlet 52; second cold-side inlet 53; second cold-side outlet 54;

[0038] adsorption tower 6; adsorbent inlet 61; adsorbent outlet 62;

[0039] regeneration tower 7; regeneration inlet 71; regeneration outlet 72;

[0040] refrigerator 8; cooling inlet 81; cooling outlet 82;

[0041] water treatment assembly 9; adjusting member 91; DETAILED DESCRIPTION

[0042] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein like reference numerals refer to like elements throughout. The embodiments described below are exemplary in nature, and are intended to be illustrative of the present application rather than to limit the same.

[0043] As shown in Figures 1-4 The flue gas low-temperature purification device of the present application comprises a spray tower 1, a cooling tower 3, a first heat exchanger 4 and a plurality of circulation pipelines.

[0044] The spray tower 1 comprises a plurality of spray sections arranged in sequence along the flow direction of the flue gas, and the plurality of spray sections are used to spray and cool the flue gas into low-temperature flue gas at subzero temperature. The plurality of circulation pipelines correspond to the plurality of spray sections one by one, so that the spray liquid in one spray section circulates between the corresponding one circulation pipeline. The liquid inlet of the cooling tower 3 is connected to the liquid outlet of at least one of the plurality of circulation pipelines, so as to cool the spray liquid discharged from the liquid outlet of the at least one circulation pipeline and supply the cooled spray liquid to the liquid inlet of the at least one circulation pipeline.

[0045] Preferably, the temperature of the low-temperature flue gas is -20℃ to -15℃.

[0046] Specifically, as shown in Figure 1 The spray tower 1 further comprises a flue gas inlet 13 for introducing flue gas into the spray tower 1. The plurality of spray sections are arranged in sequence along the flow direction of the flue gas, so as to realize step-by-step cooling of the flue gas. It can be understood that the large temperature difference between the spray liquid and the flue gas will result in poor heat exchange effect between the flue gas and the spray liquid. Therefore, arranging a plurality of spray sections in the spray tower 1 can realize step-by-step cooling of the flue gas, reduce the temperature difference between the flue gas in each spray section and improve the heat exchange effect between the flue gas and the spray liquid.

[0047] The first heat exchanger 4 has a first hot-side inlet 41 connected to the liquid outlet of at least one circulation pipeline, a first hot-side outlet 42 connected to the liquid inlet of the cooling tower 3, a first cold-side inlet 43 and a first cold-side outlet 44 connected to the inlet of the cooling tower 3. The spray liquid discharged from the liquid outlet of the at least one circulation pipeline exchanges heat with the cooling medium introduced into the first cold-side inlet 43 in the first heat exchanger 4, and the cooled cooling medium is introduced into the cooling tower 3 to exchange heat with the sprayed spray liquid entering the cooling tower 3 through the liquid inlet of the cooling tower 3.

[0048] It can be understood that the spray liquid exchanged with the flue gas in the circulation pipeline exchanges heat with the flue gas of the first cold-side inlet 43 in the first heat exchanger 4, realizing pre-cooling of the spray liquid. The exchanged spray liquid is introduced into the cooling tower 3 to exchange heat with air for the second time, so as to achieve the purpose of cooling the spray liquid.

[0049] The flue gas low-temperature purification equipment of the present application firstly utilizes air to preliminarily heat-exchange and cool the heat-exchanged spray liquid discharged from the spray tower 1 in the first heat exchanger 4, and then the heat-exchanged spray liquid is sprayed and cooled in the cooling tower 3 again, so that the spray liquid discharged from the spray tower 1 is heat-exchanged and cooled twice, and the cooling effect is good, and the consumption of electric energy is reduced, and the economy is high.

[0050] Optionally, the flue gas low-temperature purification equipment of the present application further comprises an adsorption tower 6 and a regeneration tower 7, the adsorption tower 6 is connected with the flue gas outlet 14 of the spray tower 1 for adsorbing and purifying the low-temperature flue gas discharged from the flue gas outlet as clean flue gas, and the regeneration tower 7 is connected with the adsorption tower 6 for regenerating the adsorbent after adsorption and purification.

[0051] Specifically, the flue gas outlet 14 of the spray tower 1 is connected with the adsorption tower 6 through a pipeline, so that the flue gas discharged from the spray tower 1 can be introduced into the adsorption tower 6, and the flue gas is adsorbed and purified by the adsorbent in the adsorption tower 6, and the adsorption tower 6 is connected with the regeneration tower 7 through a pipeline, so that the adsorbent after adsorbing and purifying the flue gas in the adsorption tower 6 is introduced into the regeneration tower 7 for regeneration and desorption.

[0052] The flue gas low-temperature purification equipment of the present application utilizes the spray tower 1 to reduce the temperature of the flue gas introduced therein to below 0℃, so as to ensure that the flue gas introduced into the adsorption tower 6 is low-temperature clean flue gas, and the adsorption effect is improved. The adsorbent in the adsorption tower 6 can be introduced into the regeneration tower 7, so as to desorb and regenerate the adsorbent in the regeneration tower 7.

[0053] Optionally, the adsorption tower 6 has an adsorbent inlet 61 and an adsorbent outlet 62, the regeneration tower 7 has a regeneration inlet 71 and a regeneration outlet 72, the adsorbent inlet 61 is connected with the regeneration outlet 72, and the adsorbent outlet 62 is connected with the regeneration inlet 71, so as to circulate the adsorbent between the adsorption tower 6 and the regeneration tower 7.

[0054] That is to say, the adsorbent after adsorbing and purifying the flue gas in the adsorption tower 6 of the flue gas low-temperature purification equipment of the present application can be introduced into the regeneration tower 7 through the adsorbent outlet 62 and the regeneration inlet for regeneration, and the regenerated adsorbent in the regeneration tower 7 can be introduced into the adsorption tower 6 through the regeneration outlet 72 and the adsorbent inlet 61, so as to adsorb and purify the flue gas in the adsorption tower 6 again, and the reuse of the adsorbent is realized.

[0055] It should be noted that, as Figure 4As shown, the adsorbent can be filled inside the air-permeable shell 100 for adsorption. The adsorbent can be in the form of granular or powdery adsorbent, or in the form of an adsorbent body made of powdery or granular adsorbent, such as a spherical or cylindrical body formed by the powdery or granular adsorbent through a binder, etc. Of course, a protective shell can be further formed outside the adsorbent body, such as an air-permeable membrane covering the adsorbent body, to improve the strength of the adsorbent body. The air-permeable shell has air-permeable holes, through which flue gas can enter the air-permeable shell, and the flue gas can pass through the gaps between adjacent adsorbents and / or the pores of the adsorbents, thereby reducing direct collision, friction and wear between the adsorbents, and reducing the generation of dust. The air-permeable shell can be in the form of a rotating body such as a sphere or a cylinder, wherein the diameter of the air-permeable shell 100 is 10-100 mm, and the diameter of the adsorbent is 1-10 mm.

[0056] Optionally, the cooling tower 3 assembly further comprises a spraying member 31 arranged in the cooling tower 3 and communicating with the liquid inlet of the cooling tower 3, and the inlet of the cooling tower 3, the spraying member 31 and the outlet of the cooling tower 3 are sequentially arranged in the height direction of the cooling tower 3.

[0057] Specifically, as shown, the cooling tower 3 inlet is used for introducing air to be cooled by spraying liquid, the spraying member 31 is located above the cooling tower 3 inlet to spray the spraying liquid in the cooling tower 3 by spraying, and the outlet of the cooling tower 3 is located above the spraying member 31 to discharge the air after heat exchange.

[0058] It can be understood that the spraying member 31 can be used to spray the spraying liquid after heat exchange in the cooling tower 3 to make the spraying liquid fully exchange heat with the air in the cooling tower 3.

[0059] The flue gas low-temperature purification equipment of the present application sprays the spraying liquid after heat exchange with air through the spraying member 31 to make the spraying liquid directly exchange heat with air in the cooling tower 3, and the heat exchange effect is good.

[0060] Optionally, the plurality of spraying sections are divided into a first spraying section 11 and a second spraying section 12 in the direction of flue gas flow, and the plurality of circulating pipelines comprise a first circulating pipeline 21 and a second circulating pipeline 22, the first circulating pipeline 21 is connected with the first spraying section 11, the second circulating pipeline 22 is connected with the second spraying section 12, the first hot side inlet 41 is connected with the liquid outlet of the first circulating pipeline 21, and the liquid outlet of the cooling tower 3 is connected with the liquid inlet of the first circulating pipeline 21.

[0061] That is, the flue gas low-temperature purification equipment of the present application divides the spraying tower 1 into a plurality of spraying sections to spray and cool the flue gas introduced into the spraying tower 1 step by step, thereby avoiding a large temperature difference between the spraying liquid and the flue gas, affecting the cooling effect, and avoiding excessive use of resources.

[0062] Optionally, the flue gas low-temperature purification device further comprises a refrigerating machine 8, a refrigerating inlet of the refrigerating machine 8 is connected with the liquid outlet of the second circulating pipeline 22, and a refrigerating outlet of the refrigerating machine 8 is connected with the liquid inlet of the second circulating pipeline 22, so as to cool the spraying liquid in the second circulating pipeline 22, and the cooled spraying liquid is used to reduce the temperature of the flue gas in the spraying tower 1 to below zero.

[0063] It can be understood that the spraying liquid discharged from the spraying tower 1 is cooled by the first heat exchanger 4 and the cooling tower 3, and the temperature of the spraying liquid can be reduced to the temperature of the air or slightly lower than the temperature of the air, so that the spraying liquid after cooling exchanges heat with the flue gas in the spraying tower 1, and the flue gas in the spraying tower 1 can only be cooled to close to the temperature of the air, and therefore, the refrigerating machine 8 is needed to produce lower temperature, so that the spraying liquid is used to cool the flue gas in the spraying tower 1 to below 0℃.

[0064] Optionally, the refrigerating machine 8 has a cooling inlet 81 and a cooling outlet 82, the cooling inlet 81 is connected with the liquid outlet of the cooling tower 3, so as to cool the refrigerating machine 8, and the cooling outlet 82 is connected with the spraying member 31.

[0065] It can be understood that the refrigerating machine 8 of the flue gas low-temperature purification device generates a certain heat in the use process, and the spraying liquid of the spraying tower 1 is used to cool the refrigerating machine 8, so that the additional cooling device is avoided, and the consumption of additional energy is reduced.

[0066] Optionally, the flue gas low-temperature purification device further comprises a second heat exchanger 5, the second heat exchanger 5 has a second hot-side inlet 51 connected with the cooling outlet 82, a second hot-side outlet connected with the spraying member 31, a second cold-side inlet 53, and a second cold-side outlet 54 connected with the inlet of the cooling tower 3, and the second cold-side inlet 53 is used to pass the cooling medium, so that the spraying liquid discharged from the cooling outlet 82 is passed into the cooling tower 3 after heat exchange in the second heat exchanger 5.

[0067] It should be noted that the cooling outlet 82 of the refrigerating machine 8 can also be connected with the first hot-side inlet 41 of the first heat exchanger 4, so that the liquid discharged from the cooling outlet 82 can be passed into the first heat exchanger 4 to be pre-cooled with the air, and then passed into the cooling tower 3 for second cooling. The inventor finds that due to the difference of the working environment temperature, the temperature of the spraying liquid discharged from the first spraying section 11 and the temperature of the liquid discharged from the cooling outlet 42 have a certain difference, and if the spraying liquid discharged from the first spraying section 11 and the liquid discharged from the cooling outlet 42 are both passed into the first heat exchanger 4 from the first hot-side inlet 41, the temperature of the mixed liquid is not uniform, and the pre-cooling effect is poor.

[0068] Therefore, the flue gas low-temperature purification device of the present application is provided with the first heat exchanger 4 and the second heat exchanger 5 for pre-cooling the spray liquid discharged from the first spray section 11 and the liquid discharged from the cooling outlet 42, respectively, i.e. the second heat exchanger 5 is used to firstly cool the spray liquid discharged from the cooling outlet 82, and then the cooled spray liquid is sprayed into the cooling tower 3 for further cooling, thereby improving the cooling effect of the spray liquid.

[0069] Optionally, the flue gas low-temperature purification device of the present application further comprises a water treatment assembly 9 having a water inlet and a water outlet, the water inlet being communicated with the bottom of the spray tower 1, and the water outlet being connected between the liquid outlet of the first circulating pipeline 21 and the first hot-side inlet 41, so as to pass the spray liquid purified by the spray tower 1 into the cooling tower 3.

[0070] The flue gas low-temperature purification device of the present application uses the water treatment assembly 9 to perform water treatment on the spray liquid discharged from the spray tower 1, wherein the water treatment includes filtering impurities in the spray liquid, adjusting the pH value of the spray liquid, etc., so as to weaken the corrosion of the spray liquid to the pipeline.

[0071] Preferably, the water treatment assembly 9 comprises an adjusting member 91 connected between the water inlet and the water outlet, for adjusting the pH value of the spray liquid discharged from the spray tower 1.

[0072] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0073] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0074] In the present application, unless specifically defined otherwise, the terms "mounting", "connected", "connecting", "fixed", "fixedly connected", "connection", "fixedly connected", "connected", "fixed", and the like should be construed broadly and can include fixed connections, detachable connections, or integral connections, mechanical connections, electrical connections, or communication connections between two elements, direct connections, indirect connections through an intermediate medium, or internal connections or interaction between two elements, unless specifically defined otherwise. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0075] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the second feature, or simply indicate that the first feature is higher than the second feature in horizontal height. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the second feature, or simply indicate that the first feature is lower than the second feature in horizontal height.

[0076] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, those skilled in the art can combine and combine different embodiments or examples described in the present specification and the features of different embodiments or examples without contradiction.

[0077] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and cannot be construed as limiting the present application, and changes, modifications, replacements and variations of the above embodiments made by those skilled in the art are within the scope of the present application.

Claims

1. A flue gas low-temperature cleaning apparatus, characterized by The application relates to a cooling tower assembly. The cooling tower assembly comprises a spray tower, a plurality of circulating pipelines, and a cooling tower. The spray tower comprises a plurality of spray sections arranged in sequence along the direction of flue gas flow, and the plurality of spray sections are used for spraying and cooling flue gas into low-temperature flue gas with a temperature below zero. The plurality of circulating pipelines correspond to the plurality of spray sections one by one, so that spray liquid in one spray section circulates between one corresponding circulating pipeline. The cooling tower is connected with the liquid outlet of at least one of the plurality of circulating pipelines, and is used for cooling spray liquid discharged from the liquid outlet of the at least one circulating pipeline and supplying the cooled spray liquid to the liquid inlet of the at least one circulating pipeline.

2. The flue gas low-temperature cleaning apparatus according to claim 1, characterized by The first heat exchanger has a first hot side inlet connected with the liquid outlet of the at least one circulating pipeline, a first hot side outlet connected with the liquid inlet of the cooling tower, a first cold side inlet, and a first cold side outlet connected with the inlet of the cooling tower.

3. The flue gas low-temperature cleaning apparatus according to claim 2, characterized by The spray liquid discharged from the liquid outlet of the at least one circulating pipeline exchanges heat with cooling medium entering the first cold side inlet in the first heat exchanger. The cooled cooling medium enters the cooling tower to exchange heat with sprayed spray liquid entering the cooling tower through the liquid inlet of the cooling tower.

4. The flue gas low-temperature cleaning apparatus according to claim 1, characterized by The spray tower is connected with the flue gas outlet of the spray tower to be used for adsorbing and purifying low-temperature flue gas discharged from the flue gas outlet into clean flue gas.

5. The flue gas low-temperature cleaning apparatus according to claim 4, characterized by The regeneration tower is connected with the adsorption tower to be used for regenerating adsorbent after adsorption and purification. The adsorption tower has an adsorbent inlet and an adsorbent outlet.

6. The flue gas low-temperature cleaning apparatus according to claim 5, characterized by The regeneration tower has a regeneration inlet and a regeneration outlet.

7. The flue gas low-temperature cleaning apparatus according to claim 6, characterized in that, The adsorbent inlet is connected with the regeneration outlet, and the adsorbent outlet is connected with the regeneration inlet, so that adsorbent circulates between the adsorption tower and the regeneration tower. The cooling tower assembly further comprises a spraying member arranged in the cooling tower and communicated with the liquid inlet of the cooling tower. The inlet of the cooling tower, the spraying member, and the outlet of the cooling tower are sequentially and spacedly arranged in the height direction of the cooling tower. The plurality of spray sections are divided into a first spray section and a second spray section in the direction of flue gas flow. The plurality of circulating pipelines comprise a first circulating pipeline and a second circulating pipeline. The first circulating pipeline is connected with the first spray section, and the second circulating pipeline is connected with the second spray section. The first hot side inlet is connected with the liquid outlet of the first circulating pipeline. The liquid outlet of the cooling tower is connected with the liquid inlet of the first circulating pipeline. The cooling tower further comprises a refrigerator. The refrigeration inlet of the refrigerator is connected with the liquid outlet of the second circulating pipeline. The refrigeration outlet of the refrigerator is connected with the liquid inlet of the second circulating pipeline. The refrigerator is used for cooling spray liquid in the second circulating pipeline. The cooled spray liquid is used for reducing the temperature of flue gas in the spray tower to below zero. The refrigerator has a cooling inlet and a cooling outlet. The cooling inlet is connected with the liquid outlet of the cooling tower to cool the refrigerator. The cooling outlet is connected with the spraying member.

8. The flue gas low-temperature cleaning apparatus according to claim 7, characterized by The second heat exchanger has a second hot side inlet communicated with the cooling outlet, a second hot side outlet communicated with the spray member, a second cold side inlet and a second cold side outlet communicated with the inlet of the cooling tower, and the second cold side inlet is used for passing into the cooling medium so that the spray liquid discharged from the cooling outlet is passed into the cooling tower after heat exchange in the second heat exchanger.

9. Flue gas cleaning plant according to any of claims 5-8, characterized in that, The water treatment assembly has a water inlet communicated with the bottom of the spray tower and a water outlet connected between the liquid outlet of the first circulation pipeline and the first hot side inlet so as to pass the spray liquid discharged from the spray tower into the cooling tower after purification.

10. The flue gas cleaning installation according to claim 9, characterized in that The water treatment assembly comprises an adjusting member connected between the water inlet and the water outlet and used for adjusting the pH value of the spray liquid discharged from the spray tower.

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