Regeneration device for energy cascade utilization and low-temperature flue gas adsorption regeneration system

Abstract

A regeneration device (100) for energy cascade utilization and a low-temperature flue gas adsorption regeneration system. The regeneration device (100) comprises a regeneration tower (110), a heating device (130) and a waste heat pipe (140), wherein the regeneration tower (110) is divided into a pre-heating section (111), a heating section (112) and a cooling section (113) from top to bottom, the cooling section (113) having a cooling inlet (1131) and a cooling outlet (1132), the cooling inlet (1131) being used for supplying a heat exchange medium into the cooling section (113) to cool an adsorbent. The heating device (130) heats the heat exchange medium output from the cooling outlet (1132) and then inputs same into the heating section (112) to heat the adsorbent, and the heat exchange medium with waste heat which is output from the heating section (112) enters the pre-heating section (111) through the waste heat pipe (140), thereby indirectly pre-heating the adsorbent inside the pre-heating section (111) by means of heat exchange.

Description

Energy cascade utilization regeneration device and low-temperature flue gas adsorption regeneration system

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202410096635X filed in China on January 23, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to the technical field of flue gas purification, and in particular to a regeneration device with cascaded energy utilization and a low-temperature flue gas adsorption regeneration system. Background Art

[0004] The large amount of pollutants produced by coal-fired flue gas is one of the important factors that endanger the atmospheric environment and human health. In the related art, an adsorption tower filled with adsorbent is used to adsorb the flue gas, and the adsorbent saturated with adsorption enters the regeneration tower for heating and regeneration. In the related art, the adsorption of pollutants in the flue gas is usually carried out under high temperature environment, that is, the flue gas discharged from the boiler is cooled to approximately 200°C through a cooling tower, and then enters the adsorption tower for high-temperature adsorption purification. However, the adsorption of high-temperature flue gas has the problem of poor adsorption effect, high nitrogen oxide content in the clean flue gas after adsorption, and it is impossible to achieve near-zero emissions. In order to overcome the problem of high-temperature adsorption, the related art proposes a low-temperature adsorption technology for flue gas, that is, cooling the flue gas to low-temperature flue gas, for example, below room temperature, and then adsorbing and removing pollutants from the flue gas through an adsorbent. In low-temperature adsorption, the adsorption capacity of the adsorbent is increased exponentially in a low-temperature environment, which greatly improves the adsorption purification rate compared with conventional high-temperature flue gas adsorption, and can achieve near-zero emissions of flue gas.

[0005] However, through research, the inventors realized that in the high-temperature adsorption tower, due to heat exchange with the high-temperature flue gas, the adsorbent discharged, which is saturated with adsorption, has a relatively high temperature (above 180°C). The heating load required to heat this high-temperature adsorbent to the regeneration tower (250°C-350°C) is relatively low, and the traditional one-stage heating method can meet the heating requirements. However, during the low-temperature adsorption process, the adsorbent's discharge temperature is relatively low (e.g., below room temperature) due to contact with the low-temperature flue gas. Using a conventional one-stage heating regeneration tower to heat and regenerate the adsorbent places a high load on the heater, resulting in high regeneration energy consumption and costs, hindering the further development of low-temperature flue gas adsorption technology. Summary of the Invention

[0006] The present disclosure aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the first embodiment of the present disclosure proposes a regeneration device for cascade utilization of energy.

[0007] A second embodiment of the present disclosure provides a low-temperature flue gas adsorption regeneration system.

[0008] The regeneration device for energy cascade utilization proposed in the embodiment of the first aspect of the present disclosure includes: a regeneration tower, which is divided from top to bottom into a preheating section for preheating an adsorbent, a heating section for heating the preheated adsorbent to regenerate and desorb the adsorbent, and a cooling section for cooling the regenerated adsorbent, the cooling section having a cooling inlet and a cooling outlet, the cooling inlet being used to supply a heat exchange medium into the cooling section to indirectly cool the adsorbent in the cooling section by heat exchange, and the cooling outlet being used to discharge the heat exchange medium in the cooling section; a temperature raising device, the temperature raising device being provided between the cooling outlet and the heating inlet of the heating section, and being used to heat the heat exchange medium output from the cooling outlet and then input into the heating section to indirectly heat the adsorbent in the heating section by heat exchange to regenerate and desorb the adsorbent in the heating section; a waste heat pipe, the waste heat pipe being connected between the heating outlet of the heating section and the preheating inlet of the preheating section, the heat exchange medium with waste heat output from the heating section entering the preheating section through the waste heat pipe to indirectly preheat the adsorbent in the preheating section by heat exchange.

[0009] The regeneration device for energy cascade utilization proposed in the embodiment of the present disclosure realizes multi-stage heating regeneration by arranging a preheating section, a heating section and a cooling section in the regeneration tower, that is, the adsorbent is first preheated in the preheating section, and then the preheated adsorbent is heated, which reduces the temperature rise range of the adsorbent in the heating section, effectively alleviates the heating load of the heating device, reduces the energy consumption of the regeneration device, and reduces the operating cost of the regeneration device. In addition, the multi-stage heating regeneration method of the adsorbent is conducive to increasing the residence time of the adsorbent in the regeneration tower, so that the regeneration of the adsorbent is more thorough. Moreover, the setting of the cooling section enables the adsorbent to be cooled to a certain extent before leaving the tower, and the cooled adsorbent is transported to the adsorption tower for adsorption, which reduces the contact temperature between the adsorbent and the flue gas in the adsorption tower, and helps to improve the adsorption efficiency of the adsorption tower.

[0010] Furthermore, the heat exchange medium discharged from the cooling section has a certain amount of heat due to the heat exchange. This embodiment of the present disclosure recovers this heat by using a heating device to heat the heat exchange medium discharged from the cooling section before feeding it into the heating section. Furthermore, the heat exchange medium discharged from the heating section still contains a certain amount of residual heat. This embodiment of the present disclosure recovers this residual heat and feeds it into the preheating section for utilization, achieving cascaded energy recovery and effectively reducing energy consumption.

[0011] In some embodiments, the energy cascade regeneration device further includes a mixing tube, the outlet end of which is in communication with the waste heat pipe. The mixing tube is used to introduce a temperature-regulating medium into the waste heat pipe, where the temperature-regulating medium mixes with the heat exchange medium in the waste heat pipe to adjust the temperature of the heat exchange medium in the waste heat pipe. The temperature-regulating medium is introduced into the waste heat pipe through the mixing tube, mixed with the waste heat medium in the waste heat pipe, and then enters the preheating inlet to preheat the adsorbent in the preheating section. The addition of the temperature-regulating medium is used to control the preheating temperature in the preheating section to prevent the preheating temperature from being too high or too low.

[0012] In some embodiments, the preheating section has a first medium flow channel for circulating a heat exchange medium, the heating section has a second medium flow channel for circulating a heat exchange medium, and the cooling section has a third medium flow channel for circulating a heat exchange medium. At least one of the first medium flow channel, the second medium flow channel, and the third medium flow channel is a serpentine flow channel to extend the residence time of the heat exchange medium in the regeneration tower, thereby achieving a better heat exchange effect and improving energy utilization efficiency.

[0013] In some embodiments, the preheating section is provided with a plurality of first discharge pipes, the heating section is provided with a plurality of second discharge pipes, and the cooling section is provided with a plurality of third discharge pipes. The first, second, and third discharge pipes all extend vertically to facilitate the drop of the adsorbent. The adsorbent entering from the regeneration inlet flows sequentially through the first, second, and third discharge pipes before being discharged from the regeneration outlet.

[0014] In some embodiments, a distribution cavity for forming a distribution layer is provided above the first discharge pipe, a first transition cavity for forming a first material stacking layer is provided between the preheating section and the heating section, a second transition cavity for forming a second material stacking layer is provided between the heating section and the cooling section, and the distribution cavity is provided with a first suction port located above the distribution layer, and the first suction port is used to promptly extract the regenerated gas generated in the preheating section and the distribution layer to avoid blockage problems caused by material agglomeration.

[0015] In some embodiments, the first transition chamber is provided with a second suction port, and / or the second transition chamber is provided with a third suction port. Both the second suction port and the third suction port are used to promptly extract the regeneration gas to prevent water vapor in the regeneration gas from causing material agglomeration.

[0016] In some embodiments, the temperature-raising device is a heater, which is provided on a heating tube and is used to heat the heat exchange medium output from the cooling outlet and then input it into the heating section to indirectly heat the adsorbent in the heating section through heat exchange so as to regenerate and desorb the adsorbent in the heating section; or, the temperature-raising device is a heat exchanger, the cold side inlet of the heat exchanger is connected to the cooling inlet of the cooling section, the cold side outlet of the heat exchanger is connected to the heating inlet of the heating section, and the heat exchanger is connected to an economizer to utilize the high-temperature flue gas output from the economizer to heat the heat exchange medium on the cold side of the heat exchanger.

[0017] In some embodiments, in the preheating section, the heat exchange medium preheats the adsorbent to 80°C-110°C; in the heating section, the heat exchange medium heats the adsorbent to 250°C-350°C; and in the cooling section, the heat exchange medium cools the adsorbent to 50°C-100°C. In some embodiments, in the preheating section, the heat exchange medium initially heats the adsorbent to 100°C; in the heating section, the heat exchange medium heats the adsorbent to 300°C to desorb and regenerate the adsorbent; and in the cooling section, the heat exchange medium cools the adsorbent to 80°C.

[0018] The low-temperature flue gas adsorption regeneration system proposed in the second aspect of the embodiment of the present disclosure includes: an adsorption tower, the adsorption tower having a flue gas inlet and a flue gas outlet, low-temperature flue gas below room temperature enters the adsorption tower from the flue gas inlet, contacts and adsorbs the adsorbent, and becomes clean flue gas and is discharged from the flue gas outlet; a regeneration device according to any embodiment of the first aspect above, the adsorption saturated adsorbent discharged from the adsorption tower is regenerated in the regeneration device and the regenerated adsorbent is transported back to the adsorption tower.

[0019] In some embodiments, the flue gas outlet is connected to the cooling inlet of the cooling section, and the clean flue gas output from the flue gas outlet is input into the cooling section as the heat exchange medium to indirectly cool the adsorbent in the cooling section, and then input into the heating pipe to be heated and enter the heating section to heat the adsorbent, and then enter the preheating section through the waste heat pipe to preheat the adsorbent, thereby fully utilizing the cold capacity in the low-temperature flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic structural diagram of a regeneration device for cascaded energy utilization according to an embodiment of the present disclosure.

[0021] FIG2 is a schematic diagram of the internal structure of the regeneration tower proposed in an embodiment of the present disclosure.

[0022] Figure numerals: Regeneration device 100, regeneration tower 110, preheating section 111, preheating inlet 1111, preheating outlet 1112, first medium flow channel 1113, heating section 112, heating inlet 1121, heating outlet 1122, second medium flow channel 1123, cooling section 113, cooling inlet 1131, cooling outlet 1132, third medium flow channel 1133, regeneration inlet 115, regeneration outlet 116, first discharge pipe 1171, second discharge pipe 1172, third discharge pipe 1173, cloth layer 1181, first stacking layer 1182, second stacking layer 1183, first suction port 1191, second suction port 1192, third suction port 1193, heating pipe 120, temperature rising device 130, waste heat pipe 140, mixing pipe 150, partition 160. DETAILED DESCRIPTION

[0023] The embodiments of the present disclosure are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present disclosure, but should not be understood as limiting the present disclosure.

[0024] The following describes a regeneration device 100 for cascaded energy utilization proposed in an embodiment of the first aspect of the present disclosure based on Figures 1 and 2. The regeneration device 100 includes a regeneration tower 110, a temperature increasing device 130 and a waste heat pipe 140.

[0025] The regeneration tower 110 is divided from top to bottom into a preheating section 111, a heating section 112, and a cooling section 113. The adsorbent passes through these three sections from top to bottom. The preheating section 111 is used to preheat the adsorbent, while the heating section 112 is used to heat the preheated adsorbent for regeneration and desorption. The cooling section 113 is used to cool the regenerated adsorbent.

[0026] The preheating section 111 is provided with a preheating inlet 1111 and a preheating outlet 1112, the heating section 112 is provided with a heating inlet 1121 and a heating outlet 1122, and the cooling section 113 is provided with a cooling inlet 1131 and a cooling outlet 1132. The cooling inlet 1131 is used to supply heat exchange medium into the cooling section 113 to indirectly cool the adsorbent in the cooling section 113 through heat exchange, and the cooling outlet 1132 is used to discharge the heat exchange medium in the cooling section 113.

[0027] The low-temperature heat exchange medium enters the cooling section 113 from the cooling inlet 1131 to cool the adsorbent. After heat exchange, the heat exchange medium flows out of the cooling section 113 from the cooling outlet 1132. The heating device 130 is located between the cooling outlet 1132 and the heating inlet 1121 of the heating section 112. It is used to heat the heat exchange medium output from the cooling outlet 1132 and then input it into the heating section 112. This indirectly heats the adsorbent in the heating section 112 through heat exchange, thereby regenerating and desorbing the adsorbent in the heating section 112. The heat exchange medium flowing out of the heating section 112 still carries a large amount of heat. The waste heat pipe 140 is connected between the heating outlet 1122 of the heating section 112 and the preheating inlet 1111 of the preheating section 111. The medium flowing out of the heating section 112 is a heat exchange medium with waste heat. The heat exchange medium enters the preheating section 111 through the waste heat pipe 140 to indirectly preheat the adsorbent in the preheating section 111 through heat exchange. The heat exchange medium after releasing heat is discharged from the preheating section 111 from the preheating outlet 1112.

[0028] In the embodiment shown in FIG. 1 , a heating pipe 120 is connected between the cooling outlet 1132 and the heating inlet 1121 , and the temperature increasing device 130 is disposed on the heating pipe 120 .

[0029] The adsorbent circulates from top to bottom, undergoing preheating, heating regeneration, and cooling in sequence. Specifically, the waste heat medium initially heats the adsorbent entering the regeneration tower 110 in the preheating section 111, i.e., preheating. The high-temperature medium further heats the preheated adsorbent in the heating section 112 to completely desorb the adsorbed pollutants. The low-temperature medium cools the regenerated adsorbent after desorption in the cooling section 113. It is understood that the temperature of the high-temperature medium in the heating section 112 is higher than that of the waste heat medium in the preheating section 111.

[0030] The regeneration device for energy cascade utilization proposed in the embodiment of the present disclosure realizes multi-stage heating regeneration by arranging a preheating section, a heating section and a cooling section in the regeneration tower, that is, the adsorbent is first preheated in the preheating section, and then the preheated adsorbent is heated, which reduces the temperature rise range of the adsorbent in the heating section, effectively alleviates the heating load of the heating device, reduces the energy consumption of the regeneration device, and reduces the operating cost of the regeneration device. In addition, the multi-stage heating regeneration method of the adsorbent is conducive to increasing the residence time of the adsorbent in the regeneration tower, so that the regeneration of the adsorbent is more thorough. Moreover, the setting of the cooling section enables the adsorbent to be cooled to a certain extent before leaving the tower, and the cooled adsorbent is transported to the adsorption tower for adsorption, which reduces the contact temperature between the adsorbent and the flue gas in the adsorption tower, and helps to improve the adsorption efficiency of the adsorption tower.

[0031] Furthermore, the heat exchange medium discharged from the cooling section has a certain amount of heat due to the heat exchange. This embodiment of the present disclosure recovers this heat by using a heating device to heat the heat exchange medium discharged from the cooling section before feeding it into the heating section. Furthermore, the heat exchange medium discharged from the heating section still contains a certain amount of residual heat. This embodiment of the present disclosure recovers this residual heat and feeds it into the preheating section for utilization, achieving cascaded energy recovery and effectively reducing energy consumption.

[0032] In some embodiments, the heat exchange medium flowing through the regeneration tower 110 can be either gas or liquid.

[0033] In some embodiments, in order to reduce operating costs, the heat exchange medium flowing through the regeneration tower 100 is air.

[0034] In some embodiments, in order to fully utilize the coldness in the low-temperature flue gas, the heat exchange medium flowing in the regeneration tower 100 is flue gas.

[0035] In some embodiments, as shown in FIG1 , the regeneration device 100 further includes a mixing tube 150, the outlet end of which is in communication with the waste heat pipe 140. The mixing tube 150 is used to input a temperature-regulating medium into the waste heat pipe 140. The temperature-regulating medium mixes with the heat exchange medium in the waste heat pipe 140 to adjust the temperature of the heat exchange medium in the waste heat pipe 140. The temperature-regulating medium is input into the waste heat pipe 140 through the mixing tube 150, mixed with the waste heat medium in the waste heat pipe 140, and then enters the preheating inlet 1111 to preheat the adsorbent in the preheating section 111. The addition of the temperature-regulating medium is used to control the preheating temperature in the preheating section 111 to prevent the preheating temperature from being too high or too low.

[0036] In some embodiments, the heat exchange medium circulating in the regeneration tower 100 is air, and the temperature control medium is low-temperature air. The air with lower temperature is mixed into the waste heat pipe 140 through the mixing pipe 150 to adjust the preheating temperature of the preheating section 111 to avoid the preheating temperature being too high.

[0037] In some embodiments, the heat exchange medium circulating in the regeneration tower 100 is air, and the temperature control medium is high-temperature air. Air with higher temperature is mixed into the waste heat pipe 140 through the mixing pipe 150 to adjust the preheating temperature of the preheating section 111 to avoid the preheating temperature being too low.

[0038] In some embodiments, as shown in FIG2 , the preheating section 111 includes a first medium flow channel 1113 for circulating a heat exchange medium, the first medium flow channel 1113 connecting the preheating inlet 1111 and the preheating outlet 1112. The heating section 112 includes a second medium flow channel 1123 for circulating a heat exchange medium, the second medium flow channel 1123 connecting the heating inlet 1121 and the heating outlet 1122. The cooling section 113 includes a third medium flow channel 1133 for circulating a heat exchange medium, the third medium flow channel 1133 connecting the cooling inlet 1131 and the cooling outlet 1132. The heat exchange medium flows through the first medium flow channel 1113 to indirectly exchange heat with the adsorbent to preheat the adsorbent, flows through the second medium flow channel 112 to indirectly exchange heat with the adsorbent to heat the adsorbent for regeneration, and flows through the third medium flow channel 1133 to indirectly exchange heat with the adsorbent to cool the adsorbent.

[0039] In some embodiments, in order to extend the residence time of the heat exchange medium in the regeneration tower 110 to achieve better heat exchange effect and improve energy utilization efficiency, at least one of the first medium flow channel 1113, the second medium flow channel 1123, and the third medium flow channel 1133 is a serpentine flow channel.

[0040] As an example, in the embodiment shown in Figure 2, a plurality of partitions 160 are respectively provided in the preheating section 111, the heating section 112 and the cooling section 113. The partitions 160 are arranged horizontally and spaced apart in the vertical direction to form a serpentine first medium flow channel 1113, a serpentine second medium flow channel 1123 and a serpentine third medium flow channel 1133 in the preheating section 111, the heating section 112 and the cooling section 113, respectively.

[0041] In some embodiments, a regeneration inlet 115 is provided at the top of the regeneration tower 110 , and a regeneration outlet 116 is provided at the bottom of the regeneration tower 110 . The adsorbent to be regenerated enters the regeneration tower 110 from the regeneration inlet 115 , and the regenerated adsorbent is discharged from the regeneration outlet 116 .

[0042] As shown in Figure 2, the regeneration tower 110 is equipped with a plurality of first discharge pipes 1171, a plurality of second discharge pipes 1172, and a plurality of third discharge pipes 1173. The first discharge pipes 1171 are arranged in parallel in the preheating section 111 to form a first discharge layer, the second discharge pipes 1172 are arranged in parallel in the heating section 112 to form a second discharge layer, and the third discharge pipes 1173 are arranged in parallel in the cooling section 113 to form a third discharge layer. The first discharge pipes 1171, the second discharge pipes 1172, and the third discharge pipes 1173 all extend vertically to facilitate the drop of adsorbent. Adsorbent entering the regeneration inlet 115 flows sequentially through the first discharge pipes 1171, the second discharge pipes 1172, and the third discharge pipes 1173 before being discharged from the regeneration outlet 116.

[0043] In the preheating section 111, a first medium flow channel 1113 is defined between the outer side of the first discharge pipe 1171 and the inner wall surface of the regeneration tower 110. In the heating section 112, a second medium flow channel 1123 is defined between the outer side of the second discharge pipe 1172 and the inner wall surface of the regeneration tower 110. In the cooling section 113, a third medium flow channel 1133 is defined between the outer side of the third discharge pipe 1173 and the inner wall surface of the regeneration tower 110.

[0044] In some embodiments, as shown in FIG2 , a distribution chamber for forming a distribution layer 1181 is provided below the regeneration inlet 115 and above the first discharge pipe 1171. Distribution layer 1181 is formed by the adsorbent entering the regeneration tower 110 from the regeneration inlet 115 and accumulating on top of the first discharge pipe 1171. The adsorbent in distribution layer 1181 gradually falls into the first discharge pipe 1171. A first transition chamber for forming a first distribution layer 1182 is provided between the preheating section 111 and the heating section 112, thereby forming the first distribution layer 1182 between the first and second distribution layers. A second transition chamber for forming a second distribution layer 1183 is provided between the heating section 112 and the cooling section 113, thereby forming the second distribution layer 1183 between the second and third distribution layers.

[0045] After the adsorbent to be regenerated enters from the regeneration inlet 115, it accumulates to form a cloth layer 1181. The adsorbent in the cloth layer 1181 and the preheated adsorbent that falls into the first discharge pipe 1171 are in a heated state, and will undergo partial desorption to produce regeneration gas containing water vapor. This part of the regeneration gas is easy to agglomerate with the adsorbent to form material blocks with relatively large particles, causing the discharge pipe to be blocked.

[0046] In order to avoid the blockage problem caused by material agglomeration, in some embodiments, as shown in Figure 2, the cloth chamber is provided with a first suction port 1191 located above the cloth layer 1181, and the first suction port 1191 is used to promptly extract the regeneration gas generated in the preheating section 111 and the cloth layer 1181.

[0047] In some embodiments, as shown in FIG2 , the first transition chamber is provided with a second suction port 1192 for promptly extracting the regeneration gas to prevent the water vapor in the regeneration gas from causing the material to agglomerate.

[0048] In some embodiments, as shown in FIG2 , the second transition chamber is provided with a third suction port 1193 for timely extracting the regeneration gas to prevent the water vapor in the regeneration gas from causing the material to agglomerate.

[0049] In some embodiments, as shown in FIG1 , the temperature increasing device 130 is a heater, which is provided on the heating tube 120 and is used to heat the heat exchange medium output from the cooling outlet 1132 and then input the heat exchange medium into the heating section 112 so as to indirectly heat the adsorbent in the heating section 112 through heat exchange, thereby regenerating and desorbing the adsorbent in the heating section 112 .

[0050] In some embodiments, the temperature increasing device 130 may be a heat exchanger, the cold side inlet of the heat exchanger being connected to the cooling inlet 1131 of the cooling section 113, the cold side outlet of the heat exchanger being connected to the heating inlet 1121 of the heating section 112, and the heat exchanger being connected to the economizer so that the high-temperature flue gas outputted by the economizer can be used to heat the heat exchange medium on the cold side of the heat exchanger. In other words, the hot side inlet of the heat exchanger is connected to the high-temperature flue gas outlet of the economizer, the high-temperature flue gas is input to the hot side of the heat exchanger, exchanges heat with the heat exchange medium on the cold side of the heat exchanger to heat the heat exchange medium, and the heated heat exchange medium is then input to the heating section 112 to heat the adsorbent in the regenerated heating section 112.

[0051] In some embodiments, in the preheating section 111, the heat exchange medium initially heats the adsorbent to 80 degrees Celsius to 110 degrees Celsius; in the heating section 112, the heat exchange medium heats the adsorbent to 250 degrees Celsius to 350 degrees Celsius to desorb and regenerate the adsorbent; in the cooling section 113, the heat exchange medium cools the adsorbent to 50 degrees Celsius to 100 degrees Celsius.

[0052] In some specific embodiments, in the preheating section 111, the heat exchange medium preliminarily heats the adsorbent to 100 degrees Celsius; in the heating section 112, the heat exchange medium heats the adsorbent to 300 degrees Celsius to desorb and regenerate the adsorbent; in the cooling section 113, the heat exchange medium cools the adsorbent to 80 degrees Celsius.

[0053] The second embodiment of the present disclosure provides a low-temperature flue gas adsorption regeneration system, which includes an adsorption tower and a regeneration device 100 , wherein the regeneration device 100 is the regeneration device 100 in any embodiment of the first aspect.

[0054] The adsorption tower has a flue gas inlet and a flue gas outlet. Low-temperature flue gas below room temperature enters the adsorption tower from the flue gas inlet, comes into contact with the adsorbent for adsorption, and is converted into clean flue gas and discharged from the flue gas outlet. The regeneration device 100 is used to regenerate the adsorbent saturated with adsorption discharged from the adsorption tower and return the regenerated adsorbent to the adsorption tower. The adsorption tower also has a feed inlet and a discharge port. The regeneration outlet 116 of the regeneration device 100 is connected to the feed inlet of the adsorption tower, and the discharge port of the adsorption tower is connected to the regeneration inlet 115 of the regeneration device 100. The adsorbent saturated with adsorption is fed into the regeneration device 100 for regeneration.

[0055] In some embodiments, the temperature of the low-temperature flue gas is below zero, for example, -80°C to -5°C.

[0056] In some embodiments, the temperature of the low-temperature flue gas is -20°C to -5°C. The inventors have discovered through research that the lower the flue gas temperature, the more beneficial it is for adsorption purification. However, too low a flue gas temperature complicates the structure of the flue gas cooling equipment and increases energy consumption. For example, insulation layers are required for the cooling equipment, adsorption tower, and pipelines, requiring high sealing performance, which increases costs. Furthermore, excessively low temperatures can easily lead to condensation in the adsorption tower, causing the adsorbent to stick and clog, affecting adsorption. Therefore, cooling the flue gas to a temperature of -20°C to -5°C is advantageous.

[0057] Since the clean flue gas discharged from the flue gas outlet of the adsorption tower is relatively low in temperature, a large amount of available cooling capacity is available. To fully utilize the cooling capacity in the low-temperature flue gas, in some embodiments, the flue gas outlet is connected to the cooling inlet 1131 of the cooling section 113. The clean flue gas output from the flue gas outlet is input into the cooling section 113 as a heat exchange medium to indirectly cool the adsorbent in the cooling section 113. The clean flue gas is then input into the heating pipe 120 to be heated, and then enters the heating section 112 to heat the adsorbent. The clean flue gas then enters the preheating section 111 through the waste heat pipe 140 to preheat the adsorbent.

[0058] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present disclosure.

[0059] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0060] In this disclosure, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication between them; direct connections or indirect connections through an intermediate medium; and internal communication between two elements or interaction between two elements, unless otherwise expressly limited. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on specific circumstances.

[0061] In the present disclosure, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0062] In the present disclosure, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic 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 one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

Claims

1. A regenerative device for cascaded utilization of energy, characterized in that, Comprising: A regeneration tower, which is divided from top to bottom into a preheating section for preheating the adsorbent, a heating section for heating the preheated adsorbent to regenerate and desorb the adsorbent, and a cooling section for cooling the regenerated adsorbent. The cooling section has a cooling inlet and a cooling outlet. The cooling inlet is used to supply a heat exchange medium into the cooling section to indirectly cool the adsorbent in the cooling section through heat exchange, and the cooling outlet is used to discharge the heat exchange medium in the cooling section; A heating-up device, which is arranged between the cooling outlet and the heating inlet of the heating section, and is used to heat the heat exchange medium output from the cooling outlet and then input it into the heating section to indirectly heat the adsorbent in the heating section through heat exchange to regenerate and desorb the adsorbent in the heating section; A waste heat pipe, which is connected between the heating outlet of the heating section and the preheating inlet of the preheating section. The heat exchange medium with waste heat output from the heating section enters the preheating section through the waste heat pipe to indirectly preheat the adsorbent in the preheating section through heat exchange.

2. The regenerative device for cascaded utilization of energy according to claim 1, characterized in that It further comprises a mixing pipe, the outlet end of the mixing pipe is communicated with the waste heat pipe, and the mixing pipe is used to input a temperature-regulating medium into the waste heat pipe. The temperature-regulating medium is mixed with the heat exchange medium in the waste heat pipe to adjust the temperature of the heat exchange medium in the waste heat pipe.

3. The regenerative device for cascaded energy utilization according to claim 1 or 2, characterized in that The preheating section is provided with a first medium flow channel for the heat exchange medium to flow through, the heating section is provided with a second medium flow channel for the heat exchange medium to flow through, the cooling section is provided with a third medium flow channel for the heat exchange medium to flow through, and at least one of the first medium flow channel, the second medium flow channel, and the third medium flow channel is a serpentine flow channel.

4. The regenerative device for cascaded utilization of energy according to any one of claims 1 to 3, characterized in that A plurality of first blanking pipes are arranged in the preheating section, a plurality of second blanking pipes are arranged in the heating section, and a plurality of third blanking pipes are arranged in the cooling section. The first blanking pipes, the second blanking pipes, and the third blanking pipes all extend in the vertical direction for the falling of the adsorbent.

5. The regenerative device for cascaded utilization of energy according to claim 4, characterized in that, A cloth cavity for forming a cloth layer is arranged above the first blanking pipe. A first transition cavity for forming a first stacking layer is arranged between the preheating section and the heating section, and a second transition cavity for forming a second stacking layer is arranged between the heating section and the cooling section. The cloth cavity is provided with a first suction port located above the cloth layer.

6. The regenerative device for cascaded utilization of energy according to claim 5, characterized in that The first transition cavity is provided with a second suction port, and / or the second transition cavity is provided with a third suction port.

7. The regenerative device for cascaded utilization of energy according to any one of claims 1 to 6, characterized in that The heating-up device is a heater; Or, the heating-up device is a heat exchanger. The cold-side inlet of the heat exchanger is connected to the cooling inlet of the cooling section, the cold-side outlet of the heat exchanger is connected to the heating inlet of the heating section, and the heat exchanger is communicated with an economizer to use the high-temperature flue gas output from the economizer to heat the heat exchange medium on the cold side of the heat exchanger.

8. The regeneration device for cascaded energy utilization according to any one of claims 1 to 7, wherein In the preheating section, the heat exchange medium preheats the adsorbent to 80 degrees Celsius to 110 degrees Celsius; In the heating section, the heat exchange medium heats the adsorbent to 250 degrees Celsius to 350 degrees Celsius; In the cooling section, the heat exchange medium cools the adsorbent to 50°C - 100°C.

9. A low-temperature flue gas adsorption and regeneration system, characterized in that, Comprising: An adsorption tower having a flue gas inlet and a flue gas outlet. The low-temperature flue gas below room temperature enters the adsorption tower from the flue gas inlet and contacts the adsorbent to be adsorbed and purified by the adsorbent into clean flue gas, which is discharged from the flue gas outlet. A regeneration device, which is the regeneration device for cascaded energy utilization according to any one of claims 1 to 8. The adsorbent saturated with adsorption discharged from the adsorption tower is regenerated in the regeneration device, and the regenerated adsorbent is transported back to the adsorption tower.

10. The low-temperature flue gas adsorption and regeneration system according to claim 9, characterized in that, The flue gas outlet is communicated with the cooling inlet of the cooling section, and the clean flue gas output from the flue gas outlet is input into the cooling section as the heat exchange medium to indirectly cool the adsorbent in the cooling section.

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