Flue gas cryo-sorption system

Abstract

The present application relates to the technical field of flue gas treatment and discloses a flue gas low-temperature adsorption system, which comprises a spray tower and an adsorption tower connected with each other, the spray tower has multiple-stage spray cavities, and spray assemblies are correspondingly arranged in the spray cavities, the spray assemblies are used for spraying spray liquid to cool and lower the temperature of flue gas in the spray cavities, and the flue gas is conveyed to the adsorption tower after being lowered to below room temperature in the spray tower, thereby avoiding the problem that water in the flue gas condenses into ice and causes the blockage of a conveying pipeline. The adsorption tower has an adsorption cavity and a heat exchange cavity, the adsorption cavity has an adsorbent therein, and the heat exchange cavity is used for continuously feeding cooling liquid, so as to simultaneously cool flue gas and adsorb the adsorbent, the adsorption and purification of the flue gas are performed in a subzero temperature zone, the adsorption capacity of the adsorbent is increased, the loading amount of the adsorbent in the adsorption tower is reduced, and the volume of the adsorption tower is reduced. Moreover, the cooling liquid after heat exchange is supplied to any stage of the spray assemblies as the spray liquid sprayed by the spray assemblies, the staged utilization of cold energy is realized, and the energy consumption is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of flue gas adsorption purification technology, and particularly relates to a flue gas low-temperature adsorption system. BACKGROUND

[0002] The flue gas desulfurization and denitrification process mainly adopts the SCR denitrification process and the FGD desulfurization process. The SCR denitrification process produces problems such as ammonia escape and solid catalyst hazardous waste. The FGD desulfurization process uses limestone as raw material, and the gypsum product produced after desulfurization is a kind of waste that is difficult to dispose of and cannot be effectively treated. In addition, the SCR denitrification process and the FGD desulfurization process have low removal efficiency for other pollutants such as heavy metals, VOCs, and halides.

[0003] In related technologies, the active coke method desulfurization technology and the low-temperature flue gas pollutant removal technology are used to integrally remove pollutants and improve removal efficiency. However, in the active coke method desulfurization process, the adsorption efficiency is low, and the adsorbent consumption is large, resulting in a large adsorption tower volume. In the low-temperature flue gas pollutant removal process, the pipeline for conveying flue gas is prone to blockage, which reduces the removal efficiency of flue gas pollutants. SUMMARY

[0004] The present application is based on the inventors' discovery and understanding of the following facts and problems:

[0005] In related technologies, the active coke method desulfurization process has a relatively high operating temperature, generally around 100℃, and the adsorption capacity of the adsorbent is low, resulting in problems such as large adsorbent consumption and large adsorption tower volume. In addition, the pollutant adsorption and removal process releases a large amount of heat, which affects the adsorption efficiency of the adsorbent.

[0006] In the low-temperature flue gas pollutant removal process, the flue gas is first cooled to subzero temperature by direct spraying in a spray tower, and then the cooled flue gas is conveyed to an adsorption tower for adsorption and purification. Since the water in the subzero temperature flue gas condenses into ice, ice crystals tend to accumulate at the flue gas outlet pipeline of the spray tower, causing pipeline blockage, which reduces the flue gas conveying rate and thus reduces the removal efficiency of flue gas pollutants.

[0007] The present application aims to at least partially solve one of the technical problems in related technologies. To this end, the present application proposes a flue gas low-temperature adsorption system, which has the characteristics of good flue gas cooling effect and good flue gas adsorption and purification effect.

[0008] The flue gas low-temperature adsorption system of the present application comprises: a spray tower and an adsorption tower, the spray tower is provided with a partition plate to divide the inner cavity of the spray tower into multiple levels of spray cavities in the vertical direction, the spray cavities are correspondingly provided with spray assemblies for spraying spray liquid to cool the flue gas in the spray cavities, the partition plate is provided with air passage components allowing the flue gas to pass from the lower spray cavity to the upper spray cavity and preventing the spray liquid sprayed by the upper spray assembly from entering the lower spray cavity, the flue gas is sequentially cooled to low-temperature flue gas below room temperature in the multiple levels of spray cavities and then discharged from the spray tower, the adsorption tower is connected with the spray tower to transport the low-temperature flue gas cooled in the spray tower to the adsorption tower, the inner cavity of the adsorption tower comprises an adsorption cavity and a heat exchange cavity, the adsorption cavity is provided with adsorbent, and the heat exchange cavity is used to continuously introduce cooling liquid to cool the flue gas and the adsorbent in the adsorption cavity while the adsorbent adsorbs and purifies the flue gas, so that the adsorption and purification of the flue gas are carried out in the subzero temperature zone, and the cooling liquid after heat exchange with the flue gas and the adsorbent is supplied to any level of the spray assembly as the spray liquid sprayed by the spray assembly.

[0009] The flue gas low-temperature adsorption system of the present application maintains the flue gas and the adsorbent in the subzero temperature zone, adsorbs the pollutants in the flue gas in the subzero temperature zone, increases the adsorption capacity of the adsorbent, thereby reducing the loading amount of the adsorbent in the adsorption tower, reducing the volume of the adsorption tower, and reducing the initial construction cost. Moreover, the cooling liquid continuously introduced into the heat exchange cavity timely removes the heat generated during the adsorption and purification of the flue gas, avoiding the problem of the decrease of the adsorption efficiency of the adsorbent caused by the temperature rise of the adsorbent.

[0010] In addition, the flue gas is cooled to low-temperature flue gas below room temperature in the spray tower, and the low-temperature flue gas is indirectly cooled to the subzero temperature zone by the cooling liquid in the adsorption tower. Compared with the way of directly cooling the flue gas to subzero in the spray tower and then transporting it to the adsorption tower in the related art, the flue gas low-temperature adsorption system of the present application avoids the problem of pipe blockage caused by the condensation of water in the flue gas into ice when the flue gas is transported from the spray tower to the adsorption tower. Moreover, the cooling liquid after heat exchange with the flue gas and the adsorbent in the heat exchange cavity can be used as the spray liquid for spraying and cooling the flue gas in the spray tower, and the cooling liquid after further heat exchange in the spray tower is cooled to a preset temperature by a refrigerating machine and then transported to the heat exchange cavity, realizing the staged utilization of cold energy, reducing the refrigeration equipment, and reducing the energy consumption.

[0011] Optionally, the spray cavity is two-stage and comprises a first-stage spray cavity and a second-stage spray cavity located above the first-stage spray cavity, the spray assembly is two-stage and comprises a first-stage spray assembly arranged in the first-stage spray cavity and a second-stage spray assembly arranged in the second-stage spray cavity, the spray liquid sprayed by the first-stage spray assembly cools the flue gas to a first temperature, the first temperature is 15-35℃, the spray liquid sprayed by the second-stage spray assembly cools the flue gas at the first temperature to a second temperature, the second temperature is 5-10℃, and the cooling liquid in the heat exchange cavity cools the flue gas at the second temperature to a third temperature, the third temperature is -20--5℃.

[0012] The flue gas at 80℃ entering the spray tower is cooled to 15-35℃ (room temperature) by the spray liquid sprayed by the first-stage spray assembly, then cooled to 5-10℃ (below room temperature) by the spray liquid sprayed by the second-stage spray assembly, and finally indirectly cooled to -20--5℃ (subzero temperature zone) by the cooling liquid in the heat exchange cavity in the adsorption tower, so that the flue gas is cooled in stages, the cooling effect of the flue gas is improved, and compared with directly cooling the flue gas to subzero temperature by the cooling liquid, the energy consumption of the refrigeration equipment used in the stage cooling mode is lower.

[0013] Optionally, the cooling liquid after heat exchange in the heat exchange cavity is supplied to the second-stage spray assembly.

[0014] The temperature of the cooling liquid after heat exchange with the flue gas and the adsorbent in the heat exchange cavity is -5-0℃, which is closer to the spray temperature of the second-stage spray assembly than the spray temperature of the first-stage spray assembly. Therefore, the cooling liquid after heat exchange is supplied to the second-stage spray assembly, so that the cold energy is efficiently utilized.

[0015] Optionally, the flue gas low-temperature adsorption system further comprises a cooling tower and a refrigeration machine, the first-stage spray liquid inlet of the spray tower is in communication with the outlet of the cooling tower, the first-stage spray liquid outlet of the spray tower is in communication with the inlet of the cooling tower, so as to form a first-stage spray liquid circulation loop, the outlet of the refrigeration machine is in communication with the cooling liquid inlet of the adsorption tower, the cooling liquid outlet of the adsorption tower is in communication with the second-stage spray liquid inlet of the spray tower, and the second-stage spray liquid outlet of the spray tower is in communication with the inlet of the refrigeration machine, so as to form a second-stage spray liquid circulation loop.

[0016] The cold energy of the first-stage spray liquid in the flue gas low-temperature adsorption system comes from the cooling tower (natural refrigeration), and the cold energy of the second-stage spray liquid and the cooling liquid in the heat exchange cavity comes from the refrigeration machine (electric refrigeration or absorption refrigeration), so that the refrigeration of the entire system uses lower energy consumption compared with the mode in which the entire system uses the refrigeration machine.

[0017] Optionally, the adsorption tower comprises a tower body, a first support and a second support arranged in the tower body, the first support and the second support sequentially separate the inner cavity of the tower body into a feeding cavity, a heat exchange cavity and a discharging cavity, a plurality of adsorption cylinders are arranged in the heat exchange cavity, one end of the adsorption cylinder is communicated with the feeding cavity, the other end of the adsorption cylinder is communicated with the discharging cavity, and the inner cavity of the adsorption cylinder constitutes the adsorption cavity.

[0018] The flue gas low-temperature adsorption system of the present application has the adsorption cylinders arranged in the heat exchange cavity as a whole, so that the cooling liquid can fully contact with the outer peripheral wall of the adsorption cylinder, thereby achieving optimal heat exchange effect.

[0019] Optionally, the feeding cavity, the heat exchange cavity and the discharging cavity are arranged in sequence along the vertical direction.

[0020] The flue gas low-temperature adsorption system of the present application has the flue gas flowing from bottom to top in the adsorption tower, which conforms to the flue gas flow rule (for example, the flue gas discharged from a chimney flows upward), so as to ensure the flow rate of the flue gas in the adsorption tower.

[0021] Optionally, the feeding cavity has an adsorbent inlet located at the top thereof, and the discharging cavity has an adsorbent outlet located at the bottom thereof, so that the adsorbent is continuously or intermittently supplied into the feeding cavity from the adsorbent inlet and continuously or intermittently flows out of the discharging cavity from the adsorbent outlet.

[0022] The flue gas low-temperature adsorption system of the present application has the flue gas adsorption and purification equipment as a moving bed type adsorption tower, the flue gas and the adsorbent are countercurrently contacted, the utilization rate of the adsorbent is high, and the adsorption effect is good.

[0023] Optionally, the heat exchange cavity has a cooling liquid inlet located at the bottom thereof and a cooling liquid outlet located at the top thereof, so that the cooling liquid is continuously supplied into the heat exchange cavity from the cooling liquid inlet and continuously flows out of the heat exchange cavity from the cooling liquid outlet.

[0024] The flue gas low-temperature adsorption system of the present application has the cooling liquid flowing from bottom to top in the heat exchange cavity, so that the cooling liquid fully immerses the outer peripheral wall of the adsorption cylinder, thereby ensuring optimal cooling effect.

[0025] Optionally, the flue gas low-temperature adsorption system further comprises a baffle assembly arranged in the heat exchange cavity, so that the cooling liquid entering the heat exchange cavity is baffle-rising.

[0026] Optionally, the baffle assembly comprises a plurality of baffle plates, the plurality of baffle plates are distributed in the vertical direction, the baffle plate and the inner wall of the heat exchange cavity define an upward gap, and adjacent two upward gaps are distributed in the vertical direction in a staggered manner.

[0027] The flue gas low-temperature adsorption system of the present invention utilizes baffles to deflect the coolant flowing from bottom to top, thereby increasing the time the coolant flows in the heat exchange chamber and further improving the cooling effect. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the flue gas low-temperature adsorption system according to an embodiment of the present invention.

[0029] Figure 2 This is a schematic diagram of the adsorbent in the low-temperature flue gas adsorption system of this invention.

[0030] Figure label:

[0031] Spray tower 1, primary spray assembly 11, secondary spray assembly 12, primary spray chamber 101, secondary spray chamber 102

[0032] Adsorption tower 2, first support 21, second support 22, adsorption cylinder 23, baffle 24, feed chamber 201, heat exchange chamber 202, discharge chamber 203, adsorption chamber 204, ventilated outer shell 2041, adsorbent 2042.

[0033] 3. Cooling tower; 4. Refrigeration unit. Detailed Implementation

[0034] Embodiments of the present invention are described in detail below, with examples of the embodiments illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0035] The low-temperature adsorption system for flue gas according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0036] like Figure 1 As shown, the flue gas low-temperature adsorption system of this embodiment includes a spray tower 1 and an adsorption tower 2.

[0037] The spray tower 1 is equipped with baffles to divide its interior into multiple spray chambers, which are distributed vertically at intervals. In other words, the spray tower 1 is a vertical container, and the baffles are horizontally arranged inside the spray tower 1 to divide its interior into multiple spray chambers from bottom to top.

[0038] The spray tower 1 has a flue gas inlet and a flue gas outlet. The flue gas inlet of the spray tower 1 is located at the bottom of the spray tower 1 and is connected to the lowest spray chamber. The flue gas outlet of the spray tower 1 is located at the top of the spray tower 1 and is connected to the highest spray chamber.

[0039] A spray assembly is correspondingly provided inside the spray chamber. The spray assembly is used to spray spray liquid to cool and reduce the temperature of the flue gas inside the spray chamber. A venting component (e.g., an air cap) is provided on the partition plate. The venting component allows flue gas to enter the upper spray chamber from the lower spray chamber, and prevents the spray liquid sprayed by the upper spray assembly from entering the lower spray chamber.

[0040] The spray tower 1 has a spray liquid outlet that corresponds to each of the multi-stage spray chambers. The spray liquid sprayed by the spray components exchanges heat with the flue gas and is discharged outside the tower through the spray liquid outlet. It is then transported to the corresponding refrigeration equipment to be cooled to the preset temperature and then transported back to the spray components.

[0041] The flue gas is cooled to a low temperature below room temperature by passing through multiple spray chambers in sequence before being discharged from spray tower 1. That is, the flue gas at 70℃~90℃ enters the lowest spray chamber through the flue gas inlet of spray tower 1, flows from bottom to top and passes through each spray chamber in sequence, and is cooled to a low temperature below room temperature by the spray liquid sprayed in each spray chamber. The cooled flue gas is then discharged through the flue gas outlet of spray tower 1.

[0042] Adsorption tower 2 is connected to spray tower 1 via pipeline to transport the low-temperature flue gas cooled by spray tower 1 to adsorption tower 2. Adsorption tower 2 also has a flue gas inlet and a flue gas outlet. The internal cavity of adsorption tower 2 includes an adsorption chamber 204 and a heat exchange chamber 202. The flue gas inlet and outlet of adsorption tower 2 are respectively connected to the adsorption chamber 204. The adsorption chamber 204 contains adsorbent 2042. The low-temperature flue gas transported by spray tower 1 enters the adsorption chamber 204 through the flue gas inlet of adsorption tower 2 for adsorption and purification. The purified flue gas is discharged through the flue gas outlet of adsorption tower 2, and the qualified clean flue gas is discharged into the atmosphere.

[0043] like Figure 2 As shown, the adsorbent 2042 in the adsorption chamber 204 can be in the form of an adsorption unit. The adsorption unit includes a permeable outer shell 2041 and adsorbent 2042 filled inside the permeable outer shell 2041. The adsorbent 2042 can be granular or powdered, or it can be an adsorbent body made of powder or granular adsorbent 2042, such as a spherical or cylindrical shape formed by binding powder or granular adsorbent 2042 with a binder. Of course, a protective shell can be further formed outside the adsorbent body, such as a permeable membrane covering the adsorbent body, to improve the strength of the adsorbent body. The permeable outer shell 2041 has permeable holes, allowing flue gas to enter the permeable outer shell 2041 through the permeable holes. The flue gas can also pass through the gaps between adjacent adsorbents 2042 and / or the pores within the adsorbent 2042 itself. This not only reduces direct collisions and frictional wear between the adsorbents 2042, but also reduces dust generation. The breathable outer shell 2041 can be in the shape of a sphere, cylinder, or other rotating bodies, wherein the diameter of the adsorption unit is 10mm-100mm and the diameter of the adsorbent 2042 is 1mm-10mm.

[0044] The heat exchange cavity 202 is used for continuously feeding the cooling liquid, so as to simultaneously cool the flue gas and the adsorbent 2042 in the cooling adsorption cavity 204, so that the adsorption and purification of the flue gas is carried out in the subzero temperature zone. In other words, the adsorption tower 2 has a cooling liquid inlet and a cooling liquid outlet, and the cooling liquid inlet and the cooling liquid outlet of the adsorption tower 2 are respectively communicated with the heat exchange cavity 202, and the cooling liquid is continuously supplied into the heat exchange cavity 202 from the cooling liquid inlet and continuously flows out of the heat exchange cavity 202 from the cooling liquid outlet.

[0045] It needs to be understood that in the subzero temperature environment, the nitrogen oxides in the flue gas are oxidized and adsorbed on the surface of the adsorbent 2042 such as activated carbon, and the difficult-to-adsorb nitric oxide gas is oxidized into the easy-to-adsorb nitrogen dioxide gas, so that the adsorption capacity is increased by hundreds of times, and the adsorption capacity of components such as sulfur dioxide, carbon dioxide and heavy metals is also increased by several times in the low-temperature environment.

[0046] In addition, the cooling liquid in the heat exchange cavity 202 after heat exchange with the flue gas and the adsorbent 2042 is supplied to any one of the spray assemblies 11 as the spray liquid sprayed by the spray assembly. In other words, the cooling liquid in the heat exchange cavity 202 after heat exchange with the flue gas and the adsorbent 2042 is transported to any one of the spray assemblies 11 of the spray tower 1 after being discharged out of the tower through the cooling liquid outlet of the adsorption tower 2, and the spray assembly sprays the cooling liquid after heat exchange as the spray liquid to cool and lower the temperature of the flue gas in the spray cavity.

[0047] Therefore, the flue gas low-temperature adsorption system of the embodiment of the present application maintains the flue gas and the adsorbent 2042 in the subzero temperature zone, adsorbs the pollutants in the flue gas in the subzero temperature zone, and increases the adsorption capacity of the adsorbent 2042, thereby reducing the loading amount of the adsorbent 2042 in the adsorption tower 2, reducing the volume of the adsorption tower 2, and reducing the initial construction cost. In addition, the cooling liquid continuously fed into the heat exchange cavity 202 timely takes away the heat generated in the flue gas adsorption and purification process, thereby avoiding the problem that the temperature of the adsorbent 2042 is increased and the adsorption efficiency of the adsorbent 2042 is reduced.

[0048] In addition, the flue gas is cooled to low-temperature flue gas below room temperature by the spray tower 1, and the low-temperature flue gas is indirectly cooled to the subzero temperature zone by the cooling liquid in the adsorption tower 2. Compared with the way that the flue gas is directly cooled to subzero in the spray tower and then transported to the adsorption tower in the related art, the flue gas low-temperature adsorption system of the embodiment of the present application avoids the problem that the water in the flue gas transported from the spray tower 1 to the adsorption tower 2 is condensed into ice, causing pipeline blockage. In addition, the cooling liquid in the heat exchange cavity 202 after heat exchange with the flue gas and the adsorbent 2042 can be used as the spray liquid for spraying and cooling the flue gas in the spray tower 1, and the cooling liquid after further heat exchange in the spray tower 1 is re-cooled to the preset temperature by the refrigerating machine 4 and then transported into the heat exchange cavity 202, so as to realize the staged utilization of the cold energy, reduce the refrigeration equipment, and reduce the energy consumption.

[0049] In some embodiments, such as Figure 1 As shown, the spray chamber is a two-stage system, consisting of a primary spray chamber 101 and a secondary spray chamber 102, with the secondary spray chamber 102 located above the primary spray chamber 101. In other words, a partition is provided in the middle of the spray tower 1 to divide the inner cavity of the spray tower 1 into the lower primary spray chamber 101 and the upper secondary spray chamber 102.

[0050] The spray system is a two-stage system, comprising a primary spray assembly 11 and a secondary spray assembly 12. The primary spray assembly 11 is located within the primary spray chamber 101, and the spray liquid sprayed by the primary spray assembly 11 is the primary spray liquid. The secondary spray assembly 12 is located within the secondary spray chamber 102, and the spray liquid sprayed by the secondary spray assembly 12 is the secondary spray liquid.

[0051] The spray tower 1 has two spray liquid outlets, including a primary spray liquid outlet and a secondary spray liquid outlet. The primary spray liquid outlet is located at the bottom of the primary spray chamber 101. The primary spray liquid falls to the bottom of the primary spray chamber 101 (that is, the bottom of the spray tower 1) and is discharged outside the tower through the primary spray liquid outlet. The secondary spray liquid outlet is located at the bottom of the secondary spray chamber 102. A liquid collection tank is provided on the baffle plate. The secondary spray liquid falls into the liquid collection tank and is discharged outside the tower through the secondary spray liquid outlet.

[0052] The spray liquid sprayed by the primary spray assembly 11 cools the flue gas to a first temperature, which is 15℃ to 35℃. The spray liquid sprayed by the secondary spray assembly 12 cools the flue gas at the first temperature to a second temperature, which is 5℃ to 10℃. The coolant in the heat exchange chamber 202 cools the flue gas at the second temperature to a third temperature, which is -20℃ to -15℃.

[0053] The inventors discovered through research that lower flue gas temperatures are more beneficial for adsorption and purification. However, excessively low flue gas temperatures lead to more complex equipment structures and increased energy consumption. For example, they require insulation layers in the spray towers, adsorption towers, and pipelines, as well as high sealing requirements, thus increasing costs. Furthermore, excessively low temperatures cause condensation to easily form inside the adsorption tower, leading to adsorbent adhesion and blockage, which affects adsorption. Therefore, ultimately cooling the flue gas temperature to -20℃ to -5℃ is advantageous.

[0054] Therefore, the flue gas low-temperature adsorption system of the embodiment of the present application can realize step-by-step cooling of the flue gas, improve the cooling effect of the flue gas, and reduce the energy consumption of the refrigeration equipment used in the step-by-step cooling mode compared with directly cooling the flue gas to subzero temperature by the cooling liquid.

[0055] In some embodiments, as shown in FIG. 2, the cooling liquid in the heat exchange cavity 202 after heat exchange is supplied to the secondary spraying assembly 12. Figure 1

[0056] It can be understood that the temperature of the cooling liquid in the heat exchange cavity 202 after heat exchange with the flue gas and the adsorbent 2042 is -5℃ to 0℃, which is closer to the spraying temperature of the secondary spraying assembly 12 compared with the spraying temperature of the primary spraying assembly 11. Therefore, the cooling liquid after heat exchange is supplied to the secondary spraying assembly 12 to realize efficient use of the cooling capacity.

[0057] In some embodiments, as shown in FIG. 2, the flue gas low-temperature adsorption system further comprises a cooling tower 3 and a refrigeration machine 4. Figure 1

[0058] The primary spraying liquid inlet of the primary spraying assembly 11 is communicated with the outlet of the cooling tower 3 through a pipeline, and the primary spraying liquid outlet of the spraying tower 1 is communicated with the inlet of the cooling tower 3 through a pipeline to form a primary spraying liquid circulation loop. The outlet of the refrigeration machine 4 is communicated with the cooling liquid inlet of the adsorption tower 2 through a pipeline, the cooling liquid outlet of the adsorption tower 2 is communicated with the spraying liquid inlet of the secondary spraying assembly 12 through a pipeline, and the secondary spraying liquid outlet of the spraying tower 1 is communicated with the inlet of the refrigeration machine 4 through a pipeline to form a secondary spraying liquid circulation loop.

[0059] The flue gas low-temperature adsorption system of the embodiment of the present application, the cooling capacity of the primary spraying liquid comes from the cooling tower 3 (natural refrigeration), and the cooling capacity of the secondary spraying liquid and the cooling liquid in the heat exchange cavity 202 comes from the refrigeration machine 4 (electric refrigeration or absorption refrigeration), which can ensure that the refrigeration of the entire system uses lower energy consumption compared with the mode in which the refrigeration machine 4 is used in the entire system.

[0060] In some embodiments, as shown in FIG. 2, the flue gas low-temperature adsorption system further comprises a cooling tower 3 and a refrigeration machine 4. Figure 1 ​​As shown, the adsorption tower 2 comprises a tower body, a first support 21 and a second support 22. The first support 21 and the second support 22 are arranged in the tower body, and the first support 21 and the second support 22 sequentially separate the inner cavity of the tower body into a feeding cavity 201, a heat exchange cavity 202 and a discharging cavity 203. A plurality of adsorption cylinders 23 are arranged in the heat exchange cavity 202, one end (the upper end of the adsorption cylinder 23) of the adsorption cylinder 23 is communicated with the feeding cavity 201, the other end (the lower end of the adsorption cylinder 23) of the adsorption cylinder 23 is communicated with the discharging cavity 203, and the inner cavity of the adsorption cylinder 23 constitutes an adsorption cavity 204.

[0061] It can be understood that the flue gas low-temperature adsorption system of the embodiment of the present application integrally arranges the adsorption cylinder 23 in the heat exchange cavity 202, so that the cooling liquid fully contacts the outer peripheral wall of the adsorption cylinder 23, thereby achieving the optimal heat exchange effect.

[0062] Alternatively, as shown in Figure 1 The first support 21 and the second support 22 are both horizontally arranged support plates, so as to separate the inner cavity of the tower body into the feeding cavity 201, the heat exchange cavity 202 and the discharging cavity 203 which are sequentially arranged in the vertical direction. The adsorption cylinders 23 are vertically arranged and uniformly distributed in the heat exchange cavity 202. The first support 21 is provided with inlets which are in one-to-one correspondence with and communicated with the lower end openings of the plurality of adsorption cylinders 23. The second support 22 is provided with outlets which are in one-to-one correspondence with and communicated with the upper end openings of the plurality of adsorption cylinders 23.

[0063] Therefore, in the flue gas low-temperature adsorption system of the embodiment of the present application, the flue gas flows from bottom to top in the adsorption tower 2, which conforms to the flue gas flow rule (for example, the flue gas discharged from a chimney flows upward), so as to ensure the flow rate of the flue gas in the adsorption tower 2.

[0064] In some embodiments, as shown in Figure 1 The feeding cavity 201 is provided with an adsorbent inlet at the top thereof, and the discharging cavity 203 is provided with an adsorbent outlet at the bottom thereof, so that the adsorbent 2042 is continuously or intermittently supplied into the feeding cavity 201 from the adsorbent inlet and continuously or intermittently flows out of the discharging cavity 203 from the adsorbent outlet.

[0065] The flue gas adsorption and purification equipment of the flue gas low-temperature adsorption system of the embodiment of the present application is a moving bed type adsorption tower 2. The flue gas and the adsorbent 2042 are countercurrently contacted, the utilization rate of the adsorbent 2042 is high, and the adsorption effect is good.

[0066] In some embodiments, as shown in Figure 1 The cooling liquid inlet is located at the bottom of the heat exchange cavity 202, and the cooling liquid outlet is located at the top of the heat exchange cavity 202, so that the cooling liquid in the heat exchange cavity 202 flows from bottom to top, thereby fully immersing the outer peripheral wall of the adsorption cylinder 23 with the cooling liquid, and ensuring the optimal cooling effect.

[0067] In some embodiments, asFigure 1 As shown, the flue gas low-temperature adsorption system further comprises a baffle assembly arranged in the heat exchange cavity 202 to make the cooling liquid entering the heat exchange cavity 202 to flow upward.

[0068] Optionally, the baffle assembly comprises a plurality of baffle plates 24, the plurality of baffle plates 24 are spaced apart in the vertical direction, the baffle plate 24 and the inner wall of the heat exchange cavity 202 (i.e. the inner wall of the tower body) define an upward gap, and adjacent two upward gaps are staggered in the vertical direction.

[0069] Therefore, the flue gas low-temperature adsorption system of the embodiment of the present application uses the baffle plate 24 to make the cooling liquid flowing from bottom to top to flow upward, increases the flowing time of the cooling liquid in the heat exchange cavity 202, and further improves the cooling effect.

[0070] In the description of the present application, it should be understood that the orientation or positional relationship indicated by 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 are 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 indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0071] 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, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0072] In the present application, unless otherwise explicitly specified and limited, the terms “mounting”, “connection”, “connecting”, “fixing” and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection or communication with each other; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0073] In the present application, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Also, a first feature "over", "above" and "on top of" a second feature can be directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. A first feature "under", "below" and "underneath" a second feature can be directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0074] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the present application. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Moreover, the terms "first", "second", "third", etc. are used herein merely as identifiers for different elements, regions, or layers, and are not intended to be taken literally, unless otherwise specified.

[0075] Although the above-mentioned embodiments have been shown and described, it is to be understood that these embodiments are exemplary only, and are not to be taken as limiting the scope of the present application, and that changes, modifications, substitutions and variations can be made to the above-mentioned embodiments by those skilled in the art without departing from the scope of the present application.

Claims

1. A low-temperature flue gas adsorption system, characterized in that, include: A spray tower is provided with a baffle to vertically divide the inner cavity of the spray tower into multiple spray chambers. Spraying components are correspondingly provided in each spray chamber. The spraying components are used to spray spray liquid to cool and reduce the temperature of the flue gas in the spray chamber. The baffle is provided with a venting component that allows flue gas to enter the upper spray chamber from the lower spray chamber and prevents the spray liquid sprayed by the upper spray component from entering the lower spray chamber. The flue gas is cooled to a low temperature below room temperature after passing through the multiple spray chambers in sequence and then discharged from the spray tower. An adsorption tower is connected to a spray tower to transport low-temperature flue gas cooled by the spray tower to the adsorption tower. The inner cavity of the adsorption tower includes an adsorption chamber and a heat exchange chamber. The adsorption chamber contains an adsorbent, and the heat exchange chamber is used to continuously pass a coolant through it to indirectly cool the flue gas and the adsorbent in the adsorption chamber while the adsorbent adsorbs and purifies the flue gas. This allows the adsorption and purification of the flue gas to take place in the sub-zero temperature range. The coolant, after exchanging heat with the flue gas and the adsorbent, is supplied to any stage of the spray assembly as the spray liquid for that spray assembly. The spray chamber is a two-stage system, comprising a primary spray chamber and a secondary spray chamber located above the primary spray chamber. The spray assembly is a two-stage system, comprising a primary spray assembly located within the primary spray chamber and a secondary spray assembly located within the secondary spray chamber. The spray liquid sprayed by the primary spray assembly cools the flue gas to a first temperature, which is 15℃ to 35℃. The spray liquid sprayed by the secondary spray assembly cools the flue gas at the first temperature to a second temperature, which is 5℃ to 10℃. The cooling liquid in the heat exchange chamber cools the flue gas at the second temperature to a third temperature, which is -20℃ to -5℃.

2. The low-temperature flue gas adsorption system according to claim 1, characterized in that, The coolant after heat exchange in the heat exchange chamber is supplied to the secondary spray assembly.

3. The low-temperature flue gas adsorption system according to claim 2, characterized in that, Also includes: The cooling tower has a primary spray liquid inlet connected to the outlet of the cooling tower, and a primary spray liquid outlet connected to the inlet of the cooling tower, to form a primary spray liquid circulation loop. The refrigerator has its outlet connected to the coolant inlet of the adsorption tower, the coolant outlet of the adsorption tower is connected to the secondary spray liquid inlet of the spray tower, and the secondary spray liquid outlet of the spray tower is connected to the inlet of the refrigerator, thus forming a secondary spray liquid circulation loop.

4. The flue gas low-temperature adsorption system according to any one of claims 1-3, characterized in that, The adsorption tower includes a tower body, a first support member and a second support member disposed within the tower body. The first support member and the second support member sequentially isolate the inner cavity of the tower body into a feed chamber, a heat exchange chamber and a discharge chamber. The heat exchange chamber is provided with a plurality of adsorption cylinders. One end of each adsorption cylinder is connected to the feed chamber, and the other end of each adsorption cylinder is connected to the discharge chamber. The inner cavity of each adsorption cylinder constitutes the adsorption chamber.

5. The low-temperature flue gas adsorption system according to claim 4, characterized in that, The feeding chamber, the heat exchange chamber, and the unloading chamber are arranged vertically in sequence.

6. The low-temperature flue gas adsorption system according to claim 4, characterized in that, The feed chamber has an adsorbent inlet at its top and the discharge chamber has an adsorbent outlet at its bottom, so that adsorbent is continuously or intermittently supplied into the feed chamber from the adsorbent inlet and continuously or intermittently flows out of the discharge chamber from the adsorbent outlet.

7. The low-temperature flue gas adsorption system according to claim 4, characterized in that, The heat exchange chamber has a coolant inlet at its bottom and a coolant outlet at its top, so that coolant is continuously supplied into the heat exchange chamber from the coolant inlet and continuously flows out of the heat exchange chamber from the coolant outlet.

8. The low-temperature flue gas adsorption system according to claim 7, characterized in that, It also includes a baffle assembly, which is disposed in the heat exchange chamber to cause the coolant entering the heat exchange chamber to flow upwards.

9. The low-temperature flue gas adsorption system according to claim 8, characterized in that, The baffle assembly includes multiple baffles, which are spaced apart in the vertical direction. The baffles and the inner wall of the heat exchange chamber define rising gaps, and adjacent rising gaps are staggered in the vertical direction.

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