Temperature-controlled regenerative tower and temperature control method thereof, and flue gas low-temperature adsorption regeneration system

Abstract

The present application relates to the field of flue gas purification and discloses a temperature control regenerative tower, a temperature control method thereof and a flue gas low-temperature adsorption regeneration system. The temperature control regenerative tower comprises a tower body, a mixing pipe, a temperature measuring device and a control unit. The tower body is divided into a preheating section, a heating section and a cooling section arranged in sequence from top to bottom. The cooling outlet of the cooling section is communicated with the preheating inlet of the preheating section to supply the heat exchange medium heated in the cooling section with the adsorbent in the cooling section to the preheating section to preheat the adsorbent in the preheating section. The outlet end of the mixing pipe is communicated with the preheating inlet, and the mixing pipe is used for inputting a temperature adjusting medium. The control unit is used for controlling the temperature of the temperature adjusting medium supplied through the mixing pipe according to the temperature measuring value of the temperature measuring device to control the temperature of the heat exchange medium in the preheating section within a preset range. The temperature control regenerative tower provided by the present application realizes the regulation and control of the preheating temperature of the preheating section, stabilizes the preheating temperature and ensures the preheating effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flue gas purification, in particular to a temperature control regenerator and a temperature control method thereof, and a flue gas low-temperature adsorption regeneration system. BACKGROUND

[0002] The flue gas generated by coal combustion produces a large amount of pollutants, which is one of the important factors that harm the atmospheric environment and human health. In the related technology, an adsorption tower filled with adsorbent is used to adsorb flue gas, and the adsorbent saturated with adsorption is introduced into a regenerator for heating and regeneration. In the related technology, the adsorption of pollutants in flue gas is usually carried out in a high-temperature environment, that is, the flue gas discharged from the boiler is cooled to about 200 DEG C by a cooling tower, and then introduced into the adsorption tower for high-temperature adsorption and purification, but high-temperature flue gas adsorption has the problems of poor adsorption effect, high content of nitrogen oxides in the flue gas after adsorption, and inability to achieve near-zero emission.

[0003] In order to overcome the problem of high-temperature adsorption, the related technology proposes a flue gas low-temperature adsorption technology, that is, the flue gas is cooled to low-temperature flue gas below room temperature, and the pollutants in the flue gas are removed by adsorbent. In low-temperature adsorption, the adsorption capacity of the adsorbent is multiplied in a low-temperature environment, which greatly improves the adsorption and purification rate compared with conventional high-temperature flue gas adsorption, and can achieve near-zero emission of flue gas. However, the inventors have found through research that in the high-temperature adsorption tower, due to heat exchange with high-temperature flue gas, the adsorbent saturated with adsorption discharged has a high temperature (above 180 DEG C), and the heating load of the adsorbent transported to the regenerator and heated to the regeneration temperature (250 DEG C-350 DEG C) is small, and the traditional one-stage heating method can meet the heating requirements. In the low-temperature adsorption process, the adsorbent has a low temperature (for example, below room temperature) due to contact with low-temperature flue gas, and the adsorbent is regenerated by using a conventional one-stage heating regenerator, so the load of the heater is large, the regeneration energy consumption and cost are high, and the further development of low-temperature flue gas adsorption technology is affected. SUMMARY

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

[0005] In the related technology, the regenerator is divided into a preheating section, a heating section and a cooling section from top to bottom, and the heat exchange medium discharged from the cooling section is input into the preheating section for preheating of the adsorbent, and the heat exchange medium discharged from the preheating section is heated by the heat exchanger of the boiler and then input into the heating section to heat the adsorbent, and the heat exchange medium discharged from the heating section is mixed with hot air and then returned to the boiler, but the inventors have found that the technical solution has the following problems: the temperature of the heat exchange medium discharged from the cooling section fluctuates, resulting in unstable preheating temperature in the preheating section, which affects the preheating effect of the adsorbent.

[0006] The present application aims to at least solve one of the problems in the related art. To this end, the present application proposes a temperature control regenerative tower.

[0007] The present application further proposes a flue gas low-temperature adsorption regeneration system.

[0008] The temperature control regenerative tower provided by the present application comprises a tower body, the tower body is divided into a preheating section for preheating adsorbent, a heating section for heating the preheated adsorbent to desorb and regenerate the adsorbent, and a cooling section for cooling the regenerated adsorbent, which are arranged in sequence from top to bottom, the heating section is provided with a regeneration gas outlet for discharging regeneration gas, the preheating section has a preheating inlet for supplying heat exchange medium into the preheating section to preheat the adsorbent and a preheating outlet for discharging the heat exchange medium in the preheating section, the heating section has a heating inlet for supplying heat exchange medium into the heating section to heat the adsorbent and a heating outlet for discharging the heat exchange medium in the heating section, and the cooling section has a cooling inlet for supplying heat exchange medium into the cooling section to cool the adsorbent and a cooling outlet for discharging the heat exchange medium in the cooling section, wherein the cooling outlet of the cooling section is in communication with the preheating inlet of the preheating section to supply the heat exchange medium after heat exchange with the adsorbent in the cooling section into the preheating section to preheat the adsorbent in the preheating section, a mixing pipe, the outlet end of the mixing pipe is in communication with the preheating inlet, the mixing pipe is used to input temperature adjusting medium to adjust the temperature of the heat exchange medium supplied from the cooling outlet into the preheating section, a temperature measuring device for measuring the temperature of the heat exchange medium discharged from the cooling outlet, and a control unit for controlling the temperature of the temperature adjusting medium supplied through the mixing pipe according to the temperature measured by the temperature measuring device to control the temperature of the heat exchange medium in the preheating section within a preset range.

[0009] The temperature-controlling regenerative tower provided by the application realizes multi-stage heating regeneration by setting a preheating section, a heating section and a cooling section in the temperature-controlling regenerative tower, that is, the adsorbent is preheated in the preheating section first, and then the preheated adsorbent is heated, the multi-stage heating regeneration mode realizes stepwise recycling of energy, reduces the temperature rising range of the adsorbent in the heating section, effectively relieves the heating load of the heater, reduces the energy consumption of the regeneration system, and reduces the operation cost of the regeneration system. The multi-stage heating regeneration mode of the adsorbent is conducive to increasing the residence time of the adsorbent in the temperature-controlling regenerative tower, so that the regeneration of the adsorbent is more complete. Moreover, the setting of the cooling section allows the adsorbent to be cooled to a certain extent before being discharged from the tower, and the cooled adsorbent is transported to the adsorption tower for adsorption, which reduces the contact temperature of the adsorbent and flue gas in the adsorption tower, and helps to improve the adsorption efficiency of the adsorption tower. In addition, the heat exchange medium discharged from the cooling section has a certain heat (generally 150-250 DEG C) due to heat exchange with the adsorbent, and the application fully utilizes this part of heat, and the heat exchange medium discharged from the cooling section is input into the preheating section to preheat the adsorbent. The preheating section does not need other heat sources, fully utilizes energy, and effectively reduces energy consumption.

[0010] Moreover, the temperature-controlling regenerative tower provided by the application is provided with a mixing pipe, and the temperature of the temperature-adjusting medium supplied by the mixing pipe is controlled according to the temperature of the heat exchange medium discharged from the cooling outlet, so as to realize the regulation and control of the preheating temperature in the preheating section, stabilize the preheating temperature, and ensure the preheating effect.

[0011] Optionally, the adsorbent is preheated to 80-150 DEG C in the preheating section, and / or the adsorbent is heated to 250-350 DEG C in the heating section, and / or the adsorbent is cooled to 50-100 DEG C in the cooling section.

[0012] Optionally, the temperature of the heat exchange medium discharged from the cooling outlet is 150-250 DEG C, and the temperature of the heat exchange medium discharged from the preheating outlet is 50-80 DEG C.

[0013] Optionally, the temperature-controlling regenerative tower further comprises a temperature-raising device, which is arranged between the heating inlet and the heating outlet, and is used for heating the heat exchange medium discharged from the heating outlet and inputting the heat exchange medium into the heating section to indirectly heat the adsorbent in the heating section by heat exchange, so as to desorb and regenerate the adsorbent in the heating section.

[0014] Optionally, the temperature-raising device is a heater, or the temperature-raising device is a heat exchanger, the cold side inlet of the heat exchanger is connected with the cooling inlet of the cooling section, the cold side outlet of the heat exchanger is connected with the heating inlet of the heating section, and the heat exchanger is communicated with the economizer, so as to heat the heat exchange medium on the cold side of the heat exchanger by using the high-temperature flue gas discharged from the economizer.

[0015] Optionally, a plurality of first downcomers are arranged in the preheating section, a plurality of second downcomers are arranged in the heating section, and a plurality of third downcomers are arranged in the cooling section, the first downcomers, the second downcomers and the third downcomers all extend along a vertical direction and are used for adsorbent falling; a distribution cavity for forming a distribution layer is arranged above the first downcomers, a first transition cavity for forming a first stacking layer is arranged between the preheating section and the heating section, a second transition cavity for forming a second stacking layer is arranged between the heating section and the cooling section, and the regenerated gas outlet is communicated with the second transition cavity.

[0016] Optionally, the distribution cavity is provided with a first suction port above the distribution layer, and the first transition cavity is provided with a second suction port.

[0017] Optionally, the temperature-controlled regenerator further comprises a mixing device connected between the cooling outlet and the preheating inlet, the mixing device has a mixing cavity, an outlet end of the mixing pipe is communicated with the mixing cavity, and the mixing cavity is used for mixing the temperature-adjusting medium and the heat exchange medium discharged from the cooling outlet.

[0018] Optionally, the temperature-controlled regenerator further comprises a speed measuring device for measuring the flow rate of the heat exchange medium discharged from the cooling outlet, and the control unit is further used for adjusting the flow of the temperature-adjusting medium input through the mixing pipe according to the speed value of the speed measuring device, so as to control the temperature of the heat exchange medium in the preheating section within a preset range.

[0019] The application further provides a temperature control method of a temperature-controlled regenerator, which is characterized in that the temperature control method comprises the following steps.

[0020] Setting a preset range of the heat exchange medium in the preheating section;

[0021] Measuring the temperature T of the heat exchange medium discharged from the cooling outlet in real time through the temperature measuring device;

[0022] The control unit receives the temperature value of the temperature measuring device, controls the mixing pipe to supply a first temperature-adjusting medium when the control unit judges that the temperature T is less than the minimum value of the preset range, controls the mixing pipe to supply a second temperature-adjusting medium when the control unit judges that the temperature T is greater than the maximum value of the preset range, so as to control the temperature of the heat exchange medium in the preheating section within a preset range, wherein the temperature of the first temperature-adjusting medium is higher than the temperature of the second temperature-adjusting medium.

[0023] The application further provides a flue gas low-temperature adsorption regeneration system, comprising: an adsorption tower, which 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 to contact with an adsorbent to adsorb and purify the low-temperature flue gas into clean flue gas and discharge from the flue gas outlet; and a temperature-controlled regeneration tower, which is used for regenerating the adsorption-saturated adsorbent discharged from the adsorption tower and sending the regenerated adsorbent back to the adsorption tower.

[0024] Optionally, the flue gas outlet is communicated with a cooling inlet of the cooling section, so that the clean flue gas discharged from the flue gas outlet is input into the cooling section to indirectly cool the adsorbent in the cooling section. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural schematic diagram of the temperature-controlled regeneration tower provided by the embodiment of the application.

[0026] Figure 2 is a structural schematic diagram of the temperature-controlled regeneration tower provided by the embodiment of the application.

[0027] REFERENCE SIGNS

[0028] The temperature-controlled regeneration tower 100, the tower body 110, the preheating section 111, the preheating inlet 1111, the preheating outlet 1112, the first medium flow channel 1113, the heating section 112, the heating inlet 1121, the heating outlet 1122, the second medium flow channel 1123, the cooling section 113, the cooling inlet 1131, the cooling outlet 1132, the third medium flow channel 1133, the regeneration inlet 115, the regeneration outlet 116, the first discharging pipe 1171, the second discharging pipe 1172, the third discharging pipe 1173, the cloth layer 1181, the first stacking layer 1182, the second stacking layer 1183, the first suction port 1191, the second suction port 1192, the regeneration gas outlet 1193, the pipeline 120, the electric heater 130, the heating pipe 140, the mixing pipe 150, the partition plate 160, the fan 170, and the mixing device 180. DETAILED DESCRIPTION

[0029] The embodiments of the application are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the application, and cannot be understood as a limitation of the application.

[0030] The following is based on Figure 1 and Figure 2The temperature control regenerative tower 100 comprises a tower body 110, a mixing pipe 150, a temperature measuring device and a control unit. The tower body 110 is divided into a preheating section 111, a heating section 112 and a cooling section 113 from top to bottom, and the adsorbent passes through the preheating section 111, the heating section 112 and the cooling section 113 in turn from top to bottom. The preheating section 111 is used for preheating the adsorbent, the heating section 112 is used for heating the preheated adsorbent to desorb and regenerate the adsorbent, and the cooling section 113 is used for cooling the regenerated adsorbent. The heating section 112 is provided with a regeneration gas outlet 1193 for discharging the regeneration gas.

[0031] The preheating section 111 is provided with a preheating inlet 1111 for supplying a heat exchange medium into the preheating section 111 to preheat the adsorbent and a preheating outlet 1112 for discharging the heat exchange medium in the preheating section 111, the heating section 112 is provided with a heating inlet 1121 for supplying a heat exchange medium into the heating section 112 to heat the adsorbent and a heating outlet 1122 for discharging the heat exchange medium in the heating section 112, and the cooling section 113 is correspondingly provided with a cooling inlet 1131 for supplying a heat exchange medium into the cooling section 113 to cool the adsorbent and a cooling outlet 1132 for discharging the heat exchange medium in the cooling section 113. The cooling outlet 1132 of the cooling section 113 and the preheating inlet 1111 of the preheating section 111 are communicated by a pipeline 120 to supply the heat exchange medium, which is heat-exchanged with the adsorbent in the cooling section 113, into the preheating section 111 to preheat the adsorbent in the preheating section 111.

[0032] The low-temperature heat exchange medium enters the cooling section 113 from the cooling inlet 1131 to cool the adsorbent, and the heat-exchanged heat exchange medium flows out of the cooling section 113 from the cooling outlet 1132. The heat exchange medium flowing out of the cooling section 113 has a large amount of heat, and the heat exchange medium enters the preheating section 111 through the pipeline 120 to indirectly preheat the adsorbent in the preheating section 111 by heat exchange, and the heat-exchanged heat exchange medium is discharged from the preheating section 111 from the preheating outlet 1112.

[0033] For the adsorbent, the adsorbent passes through the preheating, heating regeneration and cooling in turn from top to bottom. Specifically, the heat exchange medium in the preheating section 111 preliminarily heats the adsorbent entering the temperature control regenerative tower 110, i.e. preheating. The heat exchange medium in the heating section 112 further heats the preheated adsorbent to completely desorb the pollutants adsorbed by the adsorbent. The heat exchange medium in the cooling section 113 cools the regenerated adsorbent after desorption. It can be understood that the temperature of the heat exchange medium in the heating section 112 is higher than that of the heat exchange medium in the preheating section 111.

[0034] As Figure 1As shown, the outlet end of the mixing pipe 150 is communicated with the preheating inlet 1111 for inputting the temperature adjusting medium to adjust the temperature of the heat exchange medium supplied from the cooling outlet 1132 into the preheating section 111. The temperature measuring device is used to measure the temperature of the heat exchange medium discharged from the cooling outlet 1132. The control unit is used to control the temperature of the temperature adjusting medium supplied through the mixing pipe 150 according to the temperature measured by the temperature measuring device, so as to control the temperature of the heat exchange medium in the preheating section within a preset range, avoiding that the preheating temperature is too high or too low.

[0035] For example, in some embodiments, the preheating temperature in the preheating section 111 is controlled within 80-110 degrees Celsius. If the preheating temperature in the preheating section 111 is too high (for example, more than 110 degrees Celsius), a large amount of desorbed pollutants in the adsorbent will generate regeneration gas, which will increase the regeneration gas extraction burden of the preheating section 111. If the preheating temperature in the preheating section 111 is too low (for example, less than 80 degrees Celsius), the temperature rising pressure of the heating section 112 will be increased, the energy consumption of the regeneration tower will be increased, the regeneration cost will be increased, and in addition, the water vapor released by the adsorbent in the preheating process may condense and contact the adsorbent to form a ball, causing the discharge pipe to be blocked. Therefore, by controlling the preheating temperature in the preheating section 111 within 80-110 degrees Celsius, the temperature rising pressure of the heating section 112 can be effectively reduced, the large amount of desorption of the adsorbent in the preheating section 111 can be avoided, and the adsorbent balling can be avoided.

[0036] The temperature control regeneration tower provided by the present application realizes multi-stage heating regeneration by arranging the preheating section, the heating section and the cooling section in the temperature control regeneration tower, that is, the adsorbent is preheated in the preheating section first, and then the preheated adsorbent is heated. This multi-stage heating regeneration mode realizes the step-by-step recycling of energy, reduces the temperature rising range of the adsorbent in the heating section, effectively relieves the heating load of the heater, reduces the energy consumption of the regeneration system, and reduces the operating cost of the regeneration system. The multi-stage heating regeneration mode of the adsorbent is beneficial to increasing the residence time of the adsorbent in the temperature control regeneration tower, so that the regeneration of the adsorbent is more complete. In addition, the cooling section is arranged to cool the adsorbent to a certain extent before the adsorbent is discharged from the tower, the cooled adsorbent is transported into the adsorption tower for adsorption, the contact temperature of the adsorbent and the flue gas in the adsorption tower is reduced, which is helpful to improve the adsorption efficiency of the adsorption tower. In addition, the heat exchange medium discharged from the cooling section has a certain heat (generally 150-250 degrees Celsius) due to heat exchange with the adsorbent. The present application fully utilizes this part of heat, inputs the heat exchange medium discharged from the cooling section into the preheating section to preheat the adsorbent, and the preheating section does not need other heat sources, fully utilizes the energy, and effectively reduces the energy consumption.

[0037] And, the temperature control regenerative tower provided by the application is provided with a mixing pipe, and the temperature of the temperature adjusting medium supplied by the mixing pipe is controlled according to the temperature of the heat exchange medium discharged from the cooling outlet, so that the preheating temperature in the preheating section is adjusted and controlled, the preheating temperature is stabilized, and the preheating effect is ensured.

[0038] Optionally, the heat exchange medium flowing in the temperature control regenerative tower 110 can be gas or liquid.

[0039] Preferably, in order to reduce the operation cost, the heat exchange medium flowing in the temperature control regenerative tower 100 is air.

[0040] In some optional embodiments, the heat exchange medium flowing in the pipeline 120 is air, the temperature adjusting medium is low-temperature air, and low-temperature air is mixed into the pipeline 120 through the mixing pipe 150 to adjust the preheating temperature of the preheating section 111, so that the preheating temperature is prevented from being too high.

[0041] In some optional embodiments, the heat exchange medium flowing in the pipeline 120 is air, the temperature adjusting medium is high-temperature air, and high-temperature air is mixed into the pipeline 120 through the mixing pipe 150 to adjust the preheating temperature of the preheating section 111, so that the preheating temperature is prevented from being too low.

[0042] In some embodiments, in the preheating section 111, the heat exchange medium preliminarily heats the adsorbent to 80-110 degrees Celsius; in the heating section 112, the heat exchange medium heats the adsorbent to 250-350 degrees Celsius to make the adsorbent desorb and regenerate; and in the cooling section 113, the heat exchange medium cools the adsorbent to 50-100 degrees Celsius.

[0043] 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 make the adsorbent desorb and regenerate; and in the cooling section 113, the heat exchange medium cools the adsorbent to 80 degrees Celsius.

[0044] Optionally, the temperature of the heat exchange medium discharged from the cooling outlet 1132 of the cooling section 113 is 150-250 degrees Celsius, and the temperature of the heat exchange medium discharged from the preheating outlet 1112 is 50-80 degrees Celsius.

[0045] In some embodiments, the temperature-controlled regenerator further comprises a mixing device 180 connected between the cooling outlet 1132 and the preheating inlet 1111, the mixing device 180 having a mixing cavity, the outlet end of the mixing pipe 150 being in communication with the mixing cavity of the mixing device 180, and the mixing cavity being used for mixing the temperature-adjusting medium and the heat exchange medium discharged from the cooling outlet 1132. The temperature-adjusting medium is input into the mixing device 180 through the mixing pipe 150, and after the temperature-adjusting medium is mixed with the heat exchange medium input into the mixing device 180 from the cooling outlet 1132, the temperature-adjusting medium enters the preheating inlet 1111 and preheats the adsorbent in the preheating section 111. The arrangement of the mixing device 180 makes the mixing of the temperature-adjusting medium and the heat exchange medium more uniform, and the temperature of the heat exchange medium input into the preheating section 111 is more stable. In addition, the mixing device 180 also has a buffering effect, so that the flow rate of the heat exchange medium input into the preheating section 111 is controllable and is not affected by the flow rate of the mixing pipe 140 and the flow rate of the cooling outlet 1132.

[0046] In some embodiments, the temperature-controlled regenerator 100 further comprises a flow rate measuring device for measuring the flow rate of the heat exchange medium discharged from the cooling outlet 1132, and the control unit is further configured to adjust the flow of the temperature-adjusting medium input through the mixing pipe 150 according to the flow rate measured by the flow rate measuring device, so as to control the temperature of the heat exchange medium in the preheating section 111 within a preset range. This is to avoid the instability of the flow rate of the heat exchange medium discharged from the cooling outlet 1132, and to avoid that the temperature value alone cannot effectively adjust the temperature of the heat exchange medium, that is, the control unit can comprehensively determine the temperature and flow of the temperature-adjusting medium input through the mixing pipe 150 according to the temperature measurement result of the temperature measuring device and the flow rate measurement result of the flow rate measuring device, so as to better control the temperature of the heat exchange medium input into the preheating section 111.

[0047] The inventors have found that the related art still has the following problems: In low-temperature adsorption technology, since the temperature of the adsorbent input into the preheating section is low (usually below room temperature), the temperature of the heat exchange medium discharged from the preheating section is not high (usually 60-80°C), and it can be seen that the heat in the heat exchange medium has little value. It is difficult to modify the system, the pipeline is long, and the cost is high to input the heat exchange medium discharged from the preheating section into the heat exchanger of the boiler system to exchange heat with high-temperature flue gas and then input the heat exchange medium into the heating section. Therefore, the cost performance is not high in actual application. In addition, the temperature of the heat exchange medium discharged from the heating section is generally about 200-220°C, and the temperature of the hot air returned to the furnace is generally above 260°C. If the two are mixed and input into the boiler, the operation condition of the boiler will be affected to a certain extent, and the normal operation of the boiler will be affected to a certain extent.

[0048] To solve the above technical problems, the temperature-controlled regenerator is provided. Figure 1As shown, in some embodiments of the present invention, room temperature air enters the cooling section 113 from the cooling inlet 1131, and the air discharged from the preheating outlet 1112 is directly vented. The heat exchange medium discharged from the preheating outlet of the preheating section is directly vented and is no longer fed into the boiler for reuse, which reduces the number and length of pipelines, and lowers the equipment construction cost and equipment complexity.

[0049] like Figure 1 As shown, the temperature-controlled regeneration tower 100 also includes a heating device 130, which is located between the heating inlet 1121 and the heating outlet 1122. The heating device 130 heats the heat exchange medium discharged from the heating outlet 1122 and then inputs it into the heating section 112 to indirectly heat the adsorbent in the heating section 112 through heat exchange, thereby causing the adsorbent in the heating section 112 to desorb and regenerate. The heating section achieves self-circulation of the heat exchange medium, and the heat of the heating section comes from the heating device 130. It does not need to be coupled with the boiler system, reducing the number and length of pipelines, making the regeneration tower relatively independent, and also avoiding any impact on boiler operation.

[0050] In some alternative embodiments, such as Figure 1 As shown, the heating device 130 is an electric heater mounted on the heating tube 140, which connects the heating inlet 1121 and the heating outlet 1122. The electric heater heats the heat exchange medium discharged from the cooling outlet 1132 before introducing it into the heating section 112, indirectly heating the adsorbent in the heating section 112 through heat exchange, thus desorbing and regenerating the adsorbent. A fan 170 is connected to the heating tube 140 to drive the hot air inside the heating tube 140, causing the air to circulate within the heating tube 140 and the heating section 112.

[0051] In some alternative embodiments, the heating device 130 can be a heat exchanger, with its cold-side inlet connected to the heating outlet 1122 and its cold-side outlet connected to the heating inlet 1121. The heat exchanger is connected to an economizer to heat the heat exchange medium on the cold side of the heat exchanger using the high-temperature flue gas discharged from the economizer. That is, 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 enters the hot side of the heat exchanger and exchanges heat with the heat exchange medium on the cold side to heat the heat exchange medium. The heated heat exchange medium is then input into the heating section 112 to heat and regenerate the adsorbent within the heating section 112.

[0052] In some embodiments, such as Figure 2As shown, the preheating section 111 has a first medium flow channel 1113 for flowing the heat exchange medium, the first medium flow channel 1113 being in communication with the preheating inlet 1111 and the preheating outlet 1112, the heating section 112 has a second medium flow channel 1123 for flowing the heat exchange medium, the second medium flow channel 1123 being in communication with the heating inlet 1121 and the heating outlet 1122, and the cooling section 113 has a third medium flow channel 1133 for flowing the heat exchange medium, the third medium flow channel 1133 being in communication with the cooling inlet 1131 and the cooling outlet 1132. The heat exchange medium flows in the first medium flow channel 1113 to indirectly exchange heat with the adsorbent and preheat the adsorbent, the heat exchange medium flows in the second medium flow channel 112 to indirectly exchange heat with the adsorbent and heat the adsorbent to regenerate the adsorbent, and the heat exchange medium flows in the third medium flow channel 1133 to indirectly exchange heat with the adsorbent to cool the adsorbent.

[0053] Preferably, to prolong the residence time of the heat exchange medium in the temperature-controlled regenerator 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.

[0054] As an example, in the embodiment shown, Figure 2 In the embodiment shown, the preheating section 111, the heating section 112, and the cooling section 113 are each provided with a plurality of partitions 160, the partitions 160 being arranged horizontally and spaced apart in the vertical direction, and forming the serpentine first medium flow channel 1113, the serpentine second medium flow channel 1123, and the serpentine third medium flow channel 1133 in the preheating section 111, the heating section 112, and the cooling section 113, respectively. The serpentine first medium flow channel 1113, the serpentine second medium flow channel 1123, and the serpentine third medium flow channel 1133 prolong the flow path and residence time of the heat exchange medium therein, facilitate complete heat exchange of the heat exchange medium, further improve energy utilization efficiency, and reduce the operating cost of the regeneration device.

[0055] In some embodiments, the temperature-controlled regenerator 110 is provided with a regeneration inlet 115 at the top and a regeneration outlet 116 at the bottom, the adsorbent to be regenerated enters the temperature-controlled regenerator 110 from the regeneration inlet 115, and the regenerated adsorbent is discharged from the regeneration outlet 116.

[0056] As shown, Figure 2As shown, the temperature-controlled regeneration tower 110 is equipped with several first feed pipes 1171, several second feed pipes 1172, and several third feed pipes 1173. The first feed pipes 1171 are arranged side-by-side in the preheating section 111 to form a first feed layer; the second feed pipes 1172 are arranged side-by-side in the heating section 112 to form a second feed layer; and the third feed pipes 1173 are arranged side-by-side in the cooling section 113 to form a third feed layer. All three feed pipes extend vertically to facilitate the fall of the adsorbent. The adsorbent entering from the regeneration inlet 115 flows sequentially through the first feed pipes 1171, second feed pipes 1172, and third feed pipes 1173, and is discharged from the regeneration outlet 116. The vertically extending first discharge pipe 1171, second discharge pipe 1172, and third discharge pipe 1173 allow the adsorbent to fall smoothly, preventing blockage. In other words, the first discharge pipe 1171, second discharge pipe 1172, and third discharge pipe 1173 act as flow guides, directing the adsorbent to flow downwards. Furthermore, in each discharge layer, several first discharge pipes 1171, several second discharge pipes 1172, and several third discharge pipes 1173 are arranged side-by-side, increasing the heat exchange area. This allows for effective and uniform heat exchange between the adsorbent inside the discharge pipe and the heat exchange medium on the outside, improving heat exchange efficiency and achieving excellent heat exchange performance.

[0057] In the preheating section 111, a first medium flow channel 1113 is defined between the outer side of the first feed pipe 1171 and the inner wall of the temperature-controlled regeneration tower 110. In the heating section 112, a second medium flow channel 1123 is defined between the outer side of the second feed pipe 1172 and the inner wall of the temperature-controlled regeneration tower 110. In the cooling section 113, a third medium flow channel 1133 is defined between the outer side of the third feed pipe 1173 and the inner wall of the temperature-controlled regeneration tower 110.

[0058] Furthermore, such as Figure 2 As shown, a fabric cavity for forming a fabric layer 1181 is provided below the regeneration inlet 115 and above the first feed pipe 1171. The fabric layer 1181 is formed by the accumulation of adsorbent entering the temperature-controlled regeneration tower 110 from the regeneration inlet 115 at the top of the first feed pipe 1171. The adsorbent entering the regeneration tower 110 from the regeneration inlet 115 first accumulates in the fabric layer 1181, and then enters several parallel first feed pipes 1171 and flows downward along the first feed pipes 1171. The formation of the fabric layer 1181 helps to evenly distribute the adsorbent in the several first feed pipes 1171, so that the adsorbent can be naturally distributed into the several first feed pipes 1171.

[0059] The adsorbent in the material layer 1181 gradually falls into the first discharge pipe 1171. A first transition cavity for forming a first material accumulation layer 1182 is arranged between the preheating section 111 and the heating section 112, that is, the first material accumulation layer 1182 is formed between the first discharge layer and the second discharge layer. In order to avoid the flow of the heat exchange medium between the regeneration section 112 and the preheating section 111, the top of the first transition cavity is isolated from the first medium flow channel 1113 by a partition plate, and the bottom of the first transition cavity is isolated from the second medium flow channel 1123 by a partition plate, that is, the first transition cavity is defined by two partition plates arranged in the vertical direction, and the partition plates are connected to the inner wall surface of the regeneration tower 110. It can be understood that the bottom end of the first discharge pipe 1171 communicates with the first transition cavity through the upper partition plate, and the top end of the second discharge pipe 1172 communicates with the first transition cavity through the lower partition plate, so that the adsorbent can flow smoothly.

[0060] A second transition cavity for forming a second material accumulation layer 1183 is arranged between the heating section 112 and the cooling section 113, that is, the second material accumulation layer 1183 is formed between the second discharge layer and the third discharge layer. The regeneration gas outlet 1193 communicates with the second transition cavity. The desorption of the adsorbent to generate regeneration gas mainly occurs in the second material accumulation layer 1183. In order to avoid the flow of the heat exchange medium between the regeneration section 112 and the cooling section 113, the top of the second transition cavity is isolated from the second medium flow channel 1123 by a partition plate, and the bottom of the second transition cavity is isolated from the third medium flow channel 1133 by a partition plate, that is, the second transition cavity is defined by two partition plates arranged in the vertical direction, and the partition plates are connected to the inner wall surface of the regeneration tower 110. It can be understood that the bottom end of the second discharge pipe 1172 communicates with the first transition cavity through the upper partition plate, and the top end of the third discharge pipe 1173 communicates with the second transition cavity through the lower partition plate, so that the adsorbent can flow smoothly.

[0061] After the adsorbent to be regenerated enters from the regeneration inlet 115, it is accumulated to form the material layer 1181, and the adsorbent in the material layer 1181 and the adsorbent falling into the first discharge pipe 1171 and being preheated will be partially desorbed to generate regeneration gas containing water vapor due to the warm state, and this part of the regeneration gas is easy to be bonded with the adsorbent to form material blocks with relatively large particles, causing the discharge pipe to be blocked.

[0062] In order to avoid the blockage problem caused by material bonding, in some embodiments, as shown in Figure 2 The material cavity is provided with a first suction port 1191 located above the material layer 1181, and the first suction port 1191 is used to timely extract the regeneration gas generated in the preheating section 111 and the material layer 1181.

[0063] In some embodiments, as shown in Figure 2As shown, the first transition chamber is provided with a second suction port 1192 for timely extracting the regeneration gas, so as to avoid the water vapor in the regeneration gas from causing the material to be baled.

[0064] The temperature control method of the temperature control regenerator provided by the embodiment of the present application comprises:

[0065] The preset range of the heat exchange medium in the preheating section 111 is set;

[0066] The temperature T of the heat exchange medium discharged from the cooling outlet 1132 is measured in real time by the temperature measuring device;

[0067] The temperature measuring value of the temperature measuring device is received by the control unit, when the control unit judges that the temperature T is less than the minimum value of the preset range, the control unit controls the mixing pipe 150 to supply the first temperature adjusting medium, when the control unit judges that the temperature T is greater than the maximum value of the preset range, the control unit controls the mixing pipe 150 to supply the second temperature adjusting medium, so as to control the temperature of the heat exchange medium input into the preheating section 111 within the preset range. The temperature of the first temperature adjusting medium is higher than the temperature of the second temperature adjusting medium.

[0068] It can be understood that the temperature of the first temperature adjusting medium is at least higher than the minimum value of the preset range, and the temperature of the second temperature adjusting medium is at least lower than the maximum value of the preheating range temperature.

[0069] Another aspect of the embodiment of the present application also proposes a flue gas low-temperature adsorption regeneration system. The flue gas low-temperature adsorption regeneration system comprises an adsorption tower and a temperature control regenerator 100, wherein the temperature control regenerator 100 is the temperature control regenerator 100 in any one of the above-mentioned embodiments.

[0070] The adsorption tower has a flue gas inlet and a flue gas outlet, low-temperature flue gas below room temperature enters the adsorption tower to contact and adsorb the adsorbent, and becomes clean flue gas which is discharged from the flue gas outlet. The temperature control regenerator 100 is used for regenerating the adsorbent saturated with adsorption which is discharged from the adsorption tower and sending the regenerated adsorbent back to the adsorption tower. The adsorption tower also has a feed inlet and a discharge outlet, the regeneration outlet 116 of the temperature control regenerator 100 is in communication with the feed inlet of the adsorption tower, and the discharge outlet of the adsorption tower is in communication with the regeneration inlet 115 of the temperature control regenerator 100, so as to send the adsorbent saturated with adsorption into the temperature control regenerator 100 for regeneration.

[0071] Preferably, the temperature of the low-temperature flue gas is subzero, for example, -80℃ to -5℃.

[0072] More preferably, the temperature of the low-temperature flue gas is -20℃ to -5℃. The inventors have found through research that the lower the flue gas temperature, the more conducive to adsorption purification, but if the flue gas temperature is too low, the structure of the equipment for cooling the flue gas is complex, and the energy consumption increases, for example, the cooling equipment, the adsorption tower and the pipelines need to be provided with thermal insulation layers, and the sealing requirement is high, thereby increasing the cost. In addition, the low temperature condition causes condensate water to easily appear in the adsorption tower, causing the adsorbent to stick and block, and affecting adsorption. Therefore, it is beneficial to cool the flue gas to -20℃ to -5℃.

[0073] Since the temperature of the purified flue gas discharged from the flue gas outlet of the adsorption tower is low, there is still a large amount of available cold energy. In order to fully utilize the cold energy in the low-temperature flue gas, in some embodiments, the flue gas outlet is in communication with the cooling inlet 1131 of the cooling section 113, and the purified flue gas discharged 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.

[0074] 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.

[0075] In addition, the terms "first", "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", "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.

[0076] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected or in communication with each other; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication or interaction relationship of 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.

[0077] 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.

[0078] 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, layers, or sections, and are not intended to denote a spatial or chronological priority or order except if explicitly so defined. Also, the terms "comprises", "comprising", "includes", "including", or the like are used herein to generally mean comprising, including, or consisting of, unless otherwise indicated.

[0079] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary, and are not to be interpreted as limiting the present application, and that changes, modifications, substitutions and variations can be made therein by those skilled in the art without departing from the scope of the present application.

Claims

1. A temperature-controlled regenerative tower characterized by, The application relates to a heat exchange device for an adsorption tower, comprising: a tower body, which is divided into a preheating section for preheating adsorbents, a heating section for heating the preheated adsorbents to make the adsorbents desorb and regenerate, and a cooling section for cooling the regenerated adsorbents, the heating section is provided with a regeneration gas outlet for discharging regeneration gas, the preheating section is provided with a preheating inlet for supplying heat exchange medium into the preheating section to preheat the adsorbents and a preheating outlet for discharging the heat exchange medium in the preheating section, the heating section is provided with a heating inlet for supplying heat exchange medium into the heating section to heat the adsorbents and a heating outlet for discharging the heat exchange medium in the heating section, and the cooling section is provided with a cooling inlet for supplying heat exchange medium into the cooling section to cool the adsorbents and a cooling outlet for discharging the heat exchange medium in the cooling section, wherein the cooling outlet of the cooling section is communicated with the preheating inlet of the preheating section, so that the heat exchange medium in the cooling section after heat exchange with the adsorbents in the cooling section is supplied into the preheating section to preheat the adsorbents in the preheating section; a mixing pipe, the outlet end of the mixing pipe is communicated with the preheating inlet, and the mixing pipe is used for inputting temperature adjusting medium to adjust the temperature of the heat exchange medium supplied from the cooling outlet into the preheating section; a temperature measuring device, which is used for measuring the temperature of the heat exchange medium discharged from the cooling outlet; a control unit, which is used for controlling the temperature of the temperature adjusting medium supplied through the mixing pipe according to the temperature measurement value of the temperature measuring device, so as to control the temperature of the heat exchange medium in the preheating section within a preset range; a mixing device connected between the cooling outlet and the preheating inlet, the mixing device is provided with a mixing cavity, the outlet end of the mixing pipe is communicated with the mixing cavity, and the mixing cavity is used for mixing the temperature adjusting medium and the heat exchange medium discharged from the cooling outlet; a flow rate measuring device, which is used for measuring the flow rate of the heat exchange medium discharged from the cooling outlet, and the control unit is further used for adjusting the flow of the temperature adjusting medium input through the mixing pipe according to the flow rate measurement value of the flow rate measuring device, so as to control the temperature of the heat exchange medium in the preheating section within a preset range; the control unit comprehensively judges the temperature and flow of the temperature adjusting medium input through the mixing pipe according to the temperature measurement result of the temperature measuring device and the flow rate measurement result of the flow rate measuring device.

2. The temperature-controlled regenerative tower of claim 1, wherein, The adsorbents are preheated to 80-150 DEG C in the preheating section, and / or the adsorbents are heated to 250-350 DEG C in the heating section, and / or the adsorbents are cooled to 50-100 DEG C in the cooling section.

3. The temperature-controlled regenerative tower of claim 2, wherein, The temperature of the heat exchange medium discharged from the cooling outlet is 150-250 DEG C, and the temperature of the heat exchange medium discharged from the preheating outlet is 50-80 DEG C.

4. The temperature-controlled regenerative tower according to any one of claims 1-3, characterized in that, It also includes a heating device, which is located between the heating inlet and the heating outlet. The heating device is used to heat the heat exchange medium discharged from the heating outlet and then input it into the heating section. The heated heat exchange medium indirectly heats the adsorbent in the heating section through heat exchange, so that the adsorbent in the heating section is desorbed and regenerated.

5. The temperature-controlled regenerative tower of claim 1, wherein, The preheating section is provided with a number of first discharge pipes, the heating section is provided with a number of second discharge pipes, and the cooling section is provided with a number of third discharge pipes. The first discharge pipes, the second discharge pipes, and the third discharge pipes all extend vertically and are used for the falling of the adsorbent. The first feeding pipe has a feeding cavity above it for forming a feeding layer, a first transition cavity between the preheating section and the heating section for forming a first material layer, a second transition cavity between the heating section and the cooling section for forming a second material layer, the regeneration gas outlet is connected to the second transition cavity, the feeding cavity has a first suction port located above the feeding layer, and the first transition cavity has a second suction port.

6. A temperature control method of a temperature control regenerator, characterized by, The temperature-controlled regeneration tower is a temperature-controlled regeneration tower according to any one of claims 1-5, and the temperature control method includes: Set a preset range for the heat exchange medium within the preheating section; The temperature T of the heat exchange medium discharged from the cooling outlet is measured in real time by the temperature measuring device. The control unit receives the temperature value measured by the temperature measuring device. When the control unit determines that the temperature T is less than the minimum value of the preset range, it controls the mixing tube to supply the first temperature regulating medium. When the control unit determines that the temperature T is greater than the maximum value of the preset range, it controls the mixing tube to supply the second temperature regulating medium, so as to control the temperature of the heat exchange medium input into the preheating section within the preset range.

7. A flue gas cryogenic adsorption regeneration system characterized by, include: An 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 and comes into contact with the adsorbent to adsorb and purify the low-temperature flue gas into clean flue gas, which is then discharged from the flue gas outlet. A temperature-controlled regeneration tower, wherein the temperature-controlled regeneration tower is as described in any one of claims 1-6, the temperature-controlled regeneration tower being used to regenerate the adsorbent that has been saturated with adsorption discharged from the adsorption tower and to return the regenerated adsorbent to the adsorption tower.

8. The flue gas cryo-sorbent regeneration system of claim 7, wherein, The flue gas outlet is connected to the cooling inlet of the cooling section so that the clean flue gas discharged from the flue gas outlet is input into the cooling section to indirectly cool the adsorbent in the cooling section.

Images