A coupled system for adsorbent regeneration and flue gas cooling

Abstract

This invention relates to the field of low-temperature adsorption and purification technology for flue gas and discloses a coupled system for adsorbent regeneration and flue gas cooling. The coupled system includes a spray tower, a first circulation pipeline, a cooling tower, a second circulation pipeline, and an absorption chiller. The spray tower cools the flue gas entering it to a sub-zero temperature range. The spray liquid in the first spray section circulates between the first spray section and the first circulation pipeline. The cooling tower cools the spray liquid discharged from the outlet of the first circulation pipeline. The spray liquid in the second spray section circulates between the second spray section and the second circulation pipeline. The absorption chiller is connected to the second circulation pipeline and cools the spray liquid discharged from the second circulation pipeline. This coupled system enables multiple uses of waste heat from the flue gas, resulting in low energy consumption and high economic efficiency.

Description

Technical Field

[0001] This invention relates to the field of combined heating and cooling technology, and more specifically, to a coupled system for adsorbent regeneration and flue gas cooling. Background Technology

[0002] The low-temperature integrated pollutant removal technology is a comprehensive flue gas pollutant treatment technology. Based on the principle of low-temperature adsorption and denitrification of flue gas, the technology first removes SO2 and residual moisture through a desulfurization adsorption tower, while also adsorbing SO3, Hg, HCl, HF, VOCs and a small amount of NOx. After desulfurization and dehumidification, the flue gas is cooled to the sub-zero temperature range and then enters the low-temperature denitrification adsorption tower, where NOx is deeply adsorbed and removed at low temperature, achieving the two major goals of 'integrated removal' and 'near-zero emissions' of pollutants.

[0003] The spray towers and regeneration towers in the related technologies require a large amount of energy to cool and reheat, which exacerbates the energy consumption in the flue gas treatment system and seriously affects the system's economic efficiency. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] To address this, embodiments of the present invention propose an adsorbent regeneration and flue gas cooling coupled system. This system utilizes waste heat from the flue gas to heat the air after heat exchange in the heating section of the regeneration tower, and then uses the heat-exchanged flue gas to drive an absorption chiller to generate cooling capacity for cooling the spray liquid in the spray tower. Furthermore, a first heat exchanger and a cooling tower are used to cool the spray liquid, avoiding the need for a separate chiller, thus reducing energy consumption, maximizing energy utilization, and achieving good economic efficiency.

[0006] The adsorbent regeneration and flue gas cooling coupling system of the present invention includes:

[0007] A spray tower, comprising a first spray section and a second spray section arranged sequentially along the flue gas flow direction, wherein the first spray section and the second spray section are used to cool the flue gas introduced into the spray tower to a low temperature flue gas in the sub-zero temperature range;

[0008] A first circulation pipeline is connected to the first spray section so that the spray liquid in the first spray section circulates between the first spray section and the first circulation pipeline.

[0009] A cooling tower, wherein the inlet of the cooling tower is connected to the outlet in the first circulation pipeline to cool the spray liquid discharged from the outlet of the first circulation pipeline and supply the cooled spray liquid to the inlet of the first circulation pipeline.

[0010] The second circulation pipeline is connected to the second spray section so that the spray liquid in the second spray section circulates between the second spray section and the second circulation pipeline.

[0011] An absorption chiller, wherein the evaporator inlet of the absorption chiller is connected to the spray liquid outlet of the second circulation pipeline, and the evaporator outlet of the absorption chiller is connected to the spray liquid inlet of the second circulation pipeline, for cooling the spray liquid in the evaporator of the absorption chiller.

[0012] The adsorbent regeneration and flue gas cooling coupling system of this invention first utilizes the flue gas discharged from the boiler flue to exchange heat with clean air. The clean air, after heat exchange, then heats the adsorbent in the heating section, achieving the first utilization of the flue gas waste heat. Then, the flue gas after heat exchange is used as a power source to drive an absorption chiller to produce cooling capacity, thus achieving a second utilization of the flue gas waste heat. The cooling capacity produced by the absorption chiller can cool the spray liquid in the spray tower, replacing the original refrigeration equipment (such as a chiller) of the spray tower and reducing energy consumption.

[0013] Optionally, the adsorbent regeneration and flue gas cooling coupling system of the present invention further includes an adsorption tower, a regeneration tower, and a first heat exchanger. The adsorption tower has an adsorbent inlet, an adsorbent outlet, and a flue gas inlet connected to the flue gas outlet of the spray tower. The adsorption tower is used to adsorb and purify the low-temperature flue gas introduced through the flue gas inlet into clean flue gas. The regeneration tower includes a heating section for heating and regenerating the adsorbent therein. The regeneration tower has a regeneration inlet and a regeneration outlet. The adsorbent inlet is connected to the regeneration outlet, and the adsorbent outlet is connected to the regeneration inlet, so that the adsorbent circulates between the adsorption tower and the regeneration tower. The first heat exchanger has a first hot-side inlet connected to the boiler flue, a first hot-side outlet, a first cold-side inlet, and a first cold-side outlet connected to the heating section. The heat exchange medium introduced through the first cold-side inlet in the first heat exchanger exchanges heat with the flue gas discharged from the boiler flue and is then supplied to the heating section. The first hot-side outlet is connected to the generator inlet of the absorption chiller to drive the absorption chiller.

[0014] The adsorbent regeneration and flue gas cooling coupling system of the present invention utilizes air to perform initial heat exchange and cooling on the spray liquid discharged from the spray tower after heat exchange in the first heat exchanger. The heat-exchanged spray liquid is then fed into the cooling tower, where it is sprayed and cooled again with air. Thus, the spray liquid discharged from the spray tower undergoes two heat exchange and cooling processes, resulting in good cooling effect, reduced power consumption, and high economic efficiency.

[0015] Furthermore, the adsorbent regeneration and flue gas cooling coupling system of the present invention utilizes a spray tower to reduce the temperature of the flue gas introduced into it to below 0°C, ensuring that the flue gas introduced into the adsorption tower is low-temperature clean flue gas, thereby improving the adsorption effect. The adsorbent in the adsorption tower can be introduced into the regeneration tower so that the adsorbent can be desorbed and regenerated in the regeneration tower.

[0016] Optionally, the regeneration tower further includes a cooling section located below the heating section, and the adsorption tower also has a flue gas outlet connected to the cooling section, through which the purified flue gas is introduced to cool the adsorbent.

[0017] In the adsorbent regeneration and flue gas cooling coupling system of the present invention, after the adsorbent in the heating section exchanges heat with the high-temperature air, it can flow to the cooling section. At this time, the adsorbent still has a certain temperature. Studies have found that if the adsorbent at this temperature is directly flowed to the adsorption tower, the adsorption and purification effect on the flue gas is weak. Therefore, by introducing low-temperature clean flue gas into the cooling section to cool the adsorbent in the cooling section, the adsorption effect of the adsorbent in the adsorption tower can be improved.

[0018] Optionally, the regeneration tower also has a suction port connected to the heating section to discharge water vapor from the adsorbent.

[0019] In the adsorbent regeneration and flue gas cooling coupling system of the present invention, during the preheating, heating, and cooling processes of the adsorbent, the adsorbent is affected by different temperatures, causing some vapor to be released. If this vapor is not discharged in time, it will cause the adsorbent to clump together, hindering its flow. Therefore, the flue gas low-temperature adsorption regeneration and purification system of the present invention utilizes a suction port to promptly discharge the vapor generated in the adsorbent.

[0020] Optionally, the adsorbent regeneration and flue gas cooling coupling system of the present invention further includes a second heat exchanger. The second heat exchanger has a second hot-side inlet connected to the outlet of the first circulation pipeline, a second hot-side outlet connected to the inlet of the cooling tower, a second cold-side inlet, and a second cold-side outlet connected to the inlet of the cooling tower. The spray liquid discharged from the outlet of the first circulation pipeline exchanges heat with the cooling medium introduced into the first cold-side inlet in the second heat exchanger. The cooled medium after heat exchange is introduced into the cooling tower through the inlet of the cooling tower to exchange heat with the spray liquid supplied into the cooling tower and sprayed out through the inlet of the cooling tower.

[0021] The adsorbent regeneration and flue gas cooling coupling system of the present invention utilizes a second heat exchanger to first cool the spray liquid discharged from the cooling outlet, and then passes the cooled spray liquid into the cooling tower for spray cooling, thereby further improving the cooling effect of the spray liquid.

[0022] Optionally, the cooling tower further includes a spray element, which is disposed in the inner cavity of the cooling tower and communicates with the liquid inlet of the cooling tower. The inlet of the cooling tower, the spray element and the outlet of the cooling tower are arranged sequentially from bottom to top in the height direction of the cooling tower.

[0023] The adsorbent regeneration and flue gas cooling coupling system of the present invention sprays the spray liquid after heat exchange with air through the spray element, so that the spray liquid directly exchanges heat with air in the cooling tower, resulting in good heat exchange effect.

[0024] Optionally, the outlet of the cooling tower is connected to the absorber inlet and / or the condenser inlet of the absorption chiller for cooling the absorber and / or the condenser of the absorption chiller.

[0025] In the adsorbent regeneration and flue gas cooling coupling system of the present invention, the temperature of the condenser and absorber of the absorption chiller rises during operation, which is not conducive to the operation of the absorption chiller. Therefore, the liquid discharged from the outlet of the cooling tower is used to cool the absorber and condenser of the absorption chiller, which can ensure the stable operation of the absorption chiller.

[0026] Optionally, the adsorbent regeneration and flue gas cooling coupling system of the present invention further includes a third heat exchanger, the third heat exchanger having a third cold-side inlet, a third cold-side outlet connected to the inlet of the cooling tower, a third hot-side inlet connected to the absorber outlet of the absorption chiller and / or the condenser outlet of the absorption chiller, and a third hot-side outlet connected to the liquid inlet of the cooling tower, so that the liquid discharged from the absorber outlet of the absorption chiller and / or the condenser outlet of the absorption chiller exchanges heat with the spray liquid sprayed by the spray element in the cooling tower.

[0027] The adsorbent regeneration and flue gas cooling coupling system of the present invention utilizes a third heat exchanger to first cool the liquid discharged from the absorption chiller, and then passes the cooled liquid into a cooling tower for spray cooling, thereby further improving the cooling effect of the spray liquid.

[0028] Optionally, the adsorbent regeneration and flue gas cooling coupling system of the present invention further includes a water treatment component, which has an inlet and a outlet. The inlet is connected to the bottom of the spray tower, and the outlet is connected between the liquid outlet of the first circulation pipeline and the second hot-side inlet, so as to purify the spray liquid discharged from the spray tower and then introduce it into the cooling tower.

[0029] The flue gas low-temperature purification equipment of the present invention utilizes a water treatment component to treat the spray liquid discharged from the spray tower. The water treatment includes filtering impurities in the spray liquid, adjusting the pH value of the spray liquid, etc., to reduce the corrosion of the spray liquid on the pipelines flowing through it.

[0030] Optionally, the water treatment assembly includes a regulating element connected between the inlet and the outlet for adjusting the pH value of the spray liquid discharged from the spray cooling tower. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the adsorbent regeneration and flue gas cooling coupling system of the present invention.

[0032] Figure 2 This is a schematic diagram of the adsorbent regeneration and flue gas cooling coupling system of the present invention.

[0033] Figure 3 This is a cross-sectional schematic diagram of the air-permeable shell of the adsorbent regeneration and flue gas cooling coupling system of the present invention.

[0034] Figure label:

[0035] Breathable outer shell 100;

[0036] Spray tower 1; First spray section 11; Second spray section 12; Smoke inlet 13; Smoke outlet 14

[0037] First circulation pipe 21; Second circulation pipe 22;

[0038] Cooling tower 3; Sprayer component 31;

[0039] First heat exchanger 4; First hot side inlet 41; First hot side outlet 42; First cold side inlet 43; First cold side outlet 44;

[0040] Second heat exchanger 51; Second hot side inlet 511; Second hot side outlet 512; Second cold side inlet 513; Second cold side outlet 514;

[0041] Third heat exchanger 52; Third hot side inlet 521; Third hot side outlet 522; Third cold side inlet 523; Third cold side outlet 524;

[0042] Adsorption tower 6; Adsorbent inlet 61; Adsorbent outlet 62; Flue gas inlet 63; Flue gas outlet 64;

[0043] Regeneration tower 7; Regeneration inlet 71; Regeneration outlet 72; Heating section 73; Cooling section 74;

[0044] Absorption chiller 8; generator 81; condenser 82; absorber 83; evaporator 84;

[0045] Water treatment component 9; regulating component 91. Detailed Implementation

[0046] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0047] like Figure 1 and Figure 2 As shown, the adsorbent regeneration and flue gas cooling coupling system of the present invention includes: a spray tower 1, a first circulation pipeline 21, a cooling tower 3, a second circulation pipeline 22, and an absorption chiller 8.

[0048] The spray tower 1 includes a first spray section 11 and a second spray section 12 arranged sequentially along the flue gas flow direction. The first spray section 11 and the second spray section 12 are used to cool the flue gas entering the spray tower 1 to a low-temperature flue gas in the sub-zero temperature range. A first circulation pipe 21 is connected to the first spray section 11 to circulate the spray liquid in the first spray section 11 between the first spray section 11 and the first circulation pipe 21. The inlet of the cooling tower 3 is connected to the outlet of the first circulation pipe 21 to cool the spray liquid discharged from the outlet of the first circulation pipe 21 and to supply the cooled spray liquid to the inlet of the first circulation pipe 21. A second circulation pipe 22 is connected to the second spray section 12 to circulate the spray liquid in the second spray section 12 between the second spray section 12 and the second circulation pipe 22.

[0049] Specifically, such as Figure 1 and Figure 2 As shown, the spray tower 1 has a flue gas inlet 13 and a flue gas outlet 14. Boiler flue gas can enter the spray tower through the flue gas inlet 13, and the flue gas cooled by spraying can be discharged through the flue gas outlet 14. The spray tower 1 is divided into a first spray section 11 and a second spray section 12. The first spray section 11 is located below the second spray section 12. That is, the flue gas entering the spray tower 1 is first sprayed and cooled by the first spray section 11, and the cooled flue gas flows into the second spray section 12 so that the flue gas temperature can be reduced to below zero.

[0050] Preferably, the temperature of the low-temperature flue gas is -20℃ to -15℃.

[0051] It is understandable that water pumps are installed on both the first circulation pipeline 21 and the second circulation pipeline 22, so as to draw the spray liquid of the first spray section 11 into the first circulation pipeline 21 and the spray liquid of the second spray section 12 into the second circulation pipeline 22.

[0052] In other words, the adsorbent regeneration and flue gas cooling coupling system of the present invention utilizes multiple spray sections of the spray tower 1 to progressively cool the flue gas introduced into it. Research has shown that a large temperature difference between the spray liquid and the flue gas leads to high spray liquid consumption and poor cooling effect. Therefore, the arrangement of multiple spray sections avoids the poor flue gas cooling effect caused by a large temperature difference between the spray liquid and the flue gas, and also ensures the full utilization of the spray liquid.

[0053] The inlet of the evaporator 84 of the absorption chiller 8 is connected to the spray liquid outlet of the second circulation pipeline 22, and the outlet of the evaporator 84 of the absorption chiller 8 is connected to the spray liquid inlet of the second circulation pipeline 22, which is used to cool the spray liquid in the evaporator 84 of the absorption chiller 8.

[0054] Understandably, the power source for the absorption chiller 8 can be the flue gas generated by the boiler. That is, the high temperature of the flue gas is used to drive the absorption chiller 8 to generate cooling capacity and cool the spray liquid. Of course, other heat sources can also be used for driving, such as high-temperature steam (300℃-400℃).

[0055] It should be noted that when the absorption chiller 8 is in use (taking the lithium bromide absorption chiller 8 as an example), the lithium bromide solution in the absorber 83 is drawn into the generator 81 by a solution pump. The lithium bromide solution in the generator 81 is heated by a high-temperature heat source (high-temperature flue gas, etc.) so that the lithium bromide solution is heated and evaporated to form lithium bromide gas, which is then introduced into the condenser 82. The lithium bromide gas is condensed and liquefied in the condenser 82 and then depressurized by a throttle before being introduced into the evaporator 84. The lithium bromide solution is evaporated in the evaporator 84 and can absorb heat from the surrounding environment, thereby cooling the spray liquid introduced into the evaporator 84.

[0056] The adsorbent regeneration and flue gas cooling coupling system of this invention first utilizes the flue gas discharged from the boiler flue to exchange heat with clean air. The clean air then heats the adsorbent in the heating section 73, achieving the first utilization of the flue gas waste heat. Next, the flue gas after heat exchange is used as a power source to drive the absorption chiller 8 to produce cooling capacity, thus achieving the second utilization of the flue gas waste heat. The cooling capacity produced by the absorption chiller 8 can cool the spray liquid in the spray tower 1, replacing the original refrigeration equipment (such as a chiller) in the spray tower 1 and reducing energy consumption.

[0057] Optionally, such as Figure 1As shown, the adsorbent regeneration and flue gas cooling coupling system of the present invention further includes an adsorption tower 6, a regeneration tower 7, and a first heat exchanger 4. The adsorption tower 6 has an adsorbent inlet 61, an adsorbent outlet 62, and a flue gas inlet 63 connected to the flue gas outlet of the spray tower 1. The adsorption tower 6 is used to adsorb and purify the low-temperature flue gas introduced through the flue gas inlet 63 into clean flue gas. The regeneration tower 7 includes a heating section 73, which is used to heat and regenerate the adsorbent therein. The regeneration tower 7 has a regeneration inlet 71 and a regeneration outlet 72, with the adsorbent inlet 61 connected to the regeneration outlet 72. The adsorbent outlet 62 is connected to the regeneration inlet 71 so that the adsorbent circulates between the adsorption tower 6 and the regeneration tower 7. The first heat exchanger 4 has a first hot side inlet 41 connected to the boiler flue, a first hot side outlet 42, a first cold side inlet 43 and a first cold side outlet 44 connected to the heating section 73. The heat exchange medium introduced into the first cold side inlet 43 in the first heat exchanger 4 exchanges heat with the flue gas discharged from the boiler flue and is then supplied to the heating section 73. The first hot side outlet 42 is connected to the generator 81 inlet of the absorption chiller 8 to drive the absorption chiller 8.

[0058] Understandably, the flue gas after heat exchange in the first heat exchanger still retains a certain amount of heat. Passing this heat-exchanged flue gas into the generator of the absorption chiller can serve as a driving source for its operation. Meanwhile, in the spray tower, the spray liquid, after heat exchange with the flue gas, is passed into the evaporator of the absorption chiller. The lithium bromide solution in the evaporator absorbs heat, thus cooling the spray liquid. The cooled spray liquid is then passed back into the spray tower to spray and cool the flue gas, achieving spray liquid circulation. This also avoids the need for an electric chiller to cool the spray liquid, saving energy.

[0059] Optionally, the regeneration tower 7 also includes a cooling section 74 located below the heating section 73, and the adsorption tower 6 also has a flue gas outlet 64 connected to the cooling section 74, through which the purified flue gas is introduced to cool the adsorbent.

[0060] In the adsorbent regeneration and flue gas cooling coupling system of the present invention, after the adsorbent in the heating section 73 exchanges heat with the high-temperature air, it can flow to the cooling section 74. At this time, the adsorbent still has a certain temperature. Studies have found that if the adsorbent at this temperature is directly flowed to the adsorption tower 6, the adsorption and purification effect on the flue gas is weak. Therefore, by introducing low-temperature clean flue gas into the cooling section 74 to cool the adsorbent in the cooling section 74, the adsorption effect of the adsorbent in the adsorption tower 6 can be improved.

[0061] Specifically, such as Figure 1As shown, the adsorbent in adsorption tower 6 is used to adsorb and purify the flue gas introduced into it. After use, the adsorbent is introduced into regeneration tower 7 through adsorbent outlet 62 and regeneration inlet. The heating section 73 in regeneration tower 7 is used to heat and decompose the adsorbent. The decomposed adsorbent flows into cooling section 74 for cooling. The cooled adsorbent is introduced into adsorption tower 6 through regeneration outlet 72 and adsorbent inlet to realize the circulation of adsorbent between adsorption tower 6 and regeneration tower 7.

[0062] Understandably, the flue gas discharged from the boiler flue first exchanges heat with the air in the first heat exchanger 4. After heat exchange, the air can enter the heating section 73 of the regeneration tower 7 to heat and decompose the adsorbent in the heating section 73. The flue gas after heat exchange is then passed into the generator 81 inlet of the absorption chiller 8 to serve as the power source for the absorption chiller 8, driving the absorption chiller 8 to work. This achieves the utilization of heat from the boiler flue gas twice, avoids the waste of flue gas heat, and also saves on the consumption of other energy sources.

[0063] It should be noted that, as Figure 3 As shown, the adsorbent can be filled inside the permeable shell 100 for adsorption. The adsorbent can be granular or powdered, or it can be an adsorbent body made of powder or granular adsorbent, such as a spherical or cylindrical body formed by binding powder or granular adsorbent with a binder. Of course, a protective shell can be further formed on the outside of the adsorbent body, such as a permeable membrane covering the outside of the adsorbent body, to improve the strength of the adsorbent body. The permeable shell has vents, through which flue gas can enter the permeable shell. The flue gas can pass through the gaps between adjacent adsorbents and / or the pores of the adsorbent itself, thereby reducing direct collisions, friction and wear between adsorbents, and dust generation. The permeable shell can be in the shape of a sphere, cylinder, or other rotating body, wherein the diameter of the permeable shell 100 is 10mm-100mm, and the diameter of the adsorbent is 1mm-10mm.

[0064] The adsorbent regeneration and flue gas cooling coupling system of the present invention utilizes air in the first heat exchanger 4 to perform initial heat exchange and cooling on the spray liquid discharged from the spray tower 1 after heat exchange. The heat-exchanged spray liquid is then introduced into the cooling tower 3, where it is sprayed and cooled again with air. Thus, the spray liquid discharged from the spray tower 1 undergoes two heat exchange and cooling processes, resulting in good cooling effect, reduced power consumption, and high economic efficiency.

[0065] Furthermore, the adsorbent regeneration and flue gas cooling coupling system of the present invention utilizes a spray tower 1 to reduce the temperature of the flue gas introduced into it to below 0°C, ensuring that the flue gas introduced into the adsorption tower 6 is low-temperature clean flue gas, thereby improving the adsorption effect. The adsorbent in the adsorption tower 6 can be introduced into the regeneration tower 7 so that the adsorbent can be desorbed and regenerated in the regeneration tower 7.

[0066] Optionally, the regeneration tower 7 also has a suction port connected to the heating section 73 to discharge water vapor from the adsorbent.

[0067] In the adsorbent regeneration and flue gas cooling coupling system of the present invention, during the preheating, heating, and cooling processes of the adsorbent, the adsorbent is affected by different temperatures, causing some vapor to be released. If this vapor is not discharged in time, it will cause the adsorbent to clump together, hindering its flow. Therefore, the flue gas low-temperature adsorption regeneration and purification system of the present invention utilizes a suction port to promptly discharge the vapor generated in the adsorbent.

[0068] Optionally, the adsorbent regeneration and flue gas cooling coupling system of the present invention further includes a second heat exchanger 5. The second heat exchanger 5 has a second hot-side inlet 511 connected to the outlet of the first circulation pipe 21, a second hot-side outlet 512 connected to the inlet of the cooling tower 3, a second cold-side inlet 513, and a second cold-side outlet 514 connected to the inlet of the cooling tower 3. The spray liquid discharged from the outlet of the first circulation pipe 21 exchanges heat with the cooling medium introduced into the first cold-side inlet 43 in the second heat exchanger 5. The cooled medium after heat exchange is introduced into the cooling tower 3 through the inlet of the cooling tower 3 to exchange heat with the spray liquid supplied into the cooling tower 3 through the inlet of the cooling tower 3 and sprayed out.

[0069] Understandably, the spray liquid discharged from the first circulation pipe 21, after exchanging heat with the flue gas, exchanges heat with the air entering through the second cold side inlet 513 in the second heat exchanger 5, thus achieving pre-cooling of the spray liquid. The pre-cooled spray liquid is then introduced into the cooling tower 3 to exchange heat with the air introduced into the cooling tower 3, thereby achieving further cooling of the spray liquid.

[0070] The adsorbent regeneration and flue gas cooling coupling system of the present invention utilizes the second heat exchanger 5 to first cool the spray liquid discharged from the cooling outlet, and then introduces the cooled spray liquid into the cooling tower 3 for spray cooling, thereby further improving the cooling effect of the spray liquid.

[0071] Preferably, such as Figure 2 As shown, the cooling tower 3 also includes a spray element 31, which is located in the inner cavity of the cooling tower 3 and is connected to the liquid inlet of the cooling tower 3. The inlet of the cooling tower 3, the spray element 31 and the outlet of the cooling tower 3 are arranged sequentially from bottom to top in the height direction of the cooling tower 3.

[0072] It is understandable that the spray liquid introduced into the cooling tower 3 is sprayed out through the spray element 31 and directly exchanges heat with the air inside the cooling tower 3, which can ensure sufficient contact between the spray liquid and the air, improve the heat exchange effect, and facilitate the rapid cooling of the spray liquid.

[0073] The adsorbent regeneration and flue gas cooling coupling system of the present invention sprays the spray liquid after heat exchange with air through the spray element 31, so that the spray liquid directly exchanges heat with air in the cooling tower 3, resulting in good heat exchange effect.

[0074] Optionally, the outlet of the cooling tower 3 is connected to the inlet of the absorber 83 and / or the inlet of the condenser 82 of the absorption chiller 8 for cooling the absorber 83 and / or the condenser 82 of the absorption chiller 8.

[0075] It is understood that the liquid outlet of cooling tower 3 can be connected to the inlet of absorber 83 of absorption chiller 8, or the liquid outlet of cooling tower 3 can be connected to the inlet of condenser 82 of absorption chiller 8, or, preferably, as Figure 1 As shown, the liquid outlet of the cooling tower 3 can be connected to both the inlet of the absorber 83 and the inlet of the condenser 82 of the absorption chiller 8.

[0076] In other words, the outlet of cooling tower 3 is used to discharge the cooled spray liquid. This cooled spray liquid can not only be introduced into the first circulation pipe 21 to cool the flue gas in the spray tower 1, but also be used to cool the absorber 83 and the condenser 82 of the absorption chiller 8, so as to avoid the temperature of the inlet of the absorber 83 and the condenser 82 of the absorption chiller 8 being too high, thus reducing the cooling effect of the absorption chiller 8.

[0077] During operation, the temperature of the condenser 82 and absorber 83 of the absorption chiller 8 in the adsorbent regeneration and flue gas cooling coupling system of the present invention rises, making the operation of the absorption chiller 8 unusable. Therefore, the liquid discharged from the outlet of the cooling tower 3 is used to cool the absorber 83 and condenser 82 of the absorption chiller 8, which can ensure the stable operation of the absorption chiller 8.

[0078] Optionally, the adsorbent regeneration and flue gas cooling coupling system of the present invention further includes a third heat exchanger 52, which has a third cold-side inlet 523, a third cold-side outlet 524 connected to the inlet of the cooling tower 3, a third hot-side inlet 521 connected to the outlet of the absorber 83 of the absorption chiller 8 and / or the outlet of the condenser 82 of the absorption chiller 8, and a third hot-side outlet 522 connected to the liquid inlet of the cooling tower 3, so that the liquid discharged from the outlet of the absorber 83 of the absorption chiller 8 and / or the outlet of the condenser 82 of the absorption chiller 8 exchanges heat with the spray liquid sprayed from the spray member 31 in the cooling tower 3.

[0079] It is understandable that the third hot-side inlet 521 can be connected to the outlet of the absorber 83 of the absorption chiller 8, or the third hot-side inlet 521 can be connected to the outlet of the condenser 82 of the absorption chiller 8, or the third hot-side inlet 521 can be connected to both the outlet of the absorber 83 and the outlet of the condenser 82 of the absorption chiller 8, so that the spray liquid discharged from the cooling outlet cools the condenser 82 and the absorber 83 of the absorption chiller 8, and then is pre-cooled by the third heat exchanger 52. The pre-cooled spray liquid is then fed into the cooling tower 3 for cooling, thus realizing the circulation of the spray liquid.

[0080] The adsorbent regeneration and flue gas cooling coupling system of the present invention utilizes a third heat exchanger 52 to first cool the liquid discharged from the absorption chiller 8, and then passes the cooled liquid into the cooling tower 3 for spray cooling, thereby further improving the cooling effect of the spray liquid.

[0081] Optionally, the adsorbent regeneration and flue gas cooling coupling system of the present invention further includes a water treatment component 9, which has an inlet and a outlet. The inlet is connected to the bottom of the spray tower 1, and the outlet is connected between the liquid outlet of the first circulation pipeline 21 and the second hot side inlet 511, so as to purify the spray liquid discharged from the spray tower 1 and then pass it into the cooling tower 3.

[0082] The flue gas low-temperature purification equipment of the present invention uses a water treatment component 9 to treat the spray liquid discharged from the spray tower 1. The water treatment includes filtering impurities in the spray liquid, adjusting the pH value of the spray liquid, etc., to reduce the corrosion of the spray liquid on the pipeline.

[0083] Preferably, the water treatment component 9 includes an adjusting element 91 connected between the water inlet and the water outlet for adjusting the pH value of the spray liquid discharged from the spray cooling tower 3.

[0084] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0085] 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 indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0086] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0087] In the present invention, 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 that the first and second features are in indirect contact through an intermediary. 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.

[0088] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0089] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A coupled system for adsorbent regeneration and flue gas cooling, characterized in that, include: A spray tower, comprising a first spray section and a second spray section arranged sequentially along the flue gas flow direction, wherein the first spray section and the second spray section are used to cool the flue gas introduced into the spray tower to a low temperature flue gas in the sub-zero temperature range; A first circulation pipeline is connected to the first spray section so that the spray liquid in the first spray section circulates between the first spray section and the first circulation pipeline. A cooling tower, wherein the inlet of the cooling tower is connected to the outlet in the first circulation pipeline to cool the spray liquid discharged from the outlet of the first circulation pipeline and supply the cooled spray liquid to the inlet of the first circulation pipeline. The second circulation pipeline is connected to the second spray section so that the spray liquid in the second spray section circulates between the second spray section and the second circulation pipeline. An absorption chiller, wherein the evaporator inlet of the absorption chiller is connected to the spray liquid outlet of the second circulation pipeline, and the evaporator outlet of the absorption chiller is connected to the spray liquid inlet of the second circulation pipeline, for cooling the spray liquid in the evaporator of the absorption chiller.

2. The adsorbent regeneration and flue gas cooling coupled system according to claim 1, characterized in that, It also includes an adsorption tower, a regeneration tower, and a first heat exchanger. The adsorption tower has an adsorbent inlet, an adsorbent outlet, and a flue gas inlet connected to the flue gas outlet of the spray tower. The adsorption tower is used to adsorb and purify the low-temperature flue gas introduced through the flue gas inlet into clean flue gas. The regeneration tower includes a heating section for heating and regenerating the adsorbent therein. The regeneration tower has a regeneration inlet and a regeneration outlet. The adsorbent inlet is connected to the regeneration outlet, and the adsorbent outlet is connected to the regeneration inlet, allowing the adsorbent to circulate between the adsorption tower and the regeneration tower. The first heat exchanger has a first hot-side inlet, a first hot-side outlet, a first cold-side inlet connected to the boiler flue, and a first cold-side outlet connected to the heating section. The heat exchange medium introduced into the first cold-side inlet in the first heat exchanger exchanges heat with the flue gas discharged from the boiler flue and is then supplied to the heating section. The first hot-side outlet is connected to the generator inlet of the absorption chiller to drive the absorption chiller.

3. The adsorbent regeneration and flue gas cooling coupled system according to claim 2, characterized in that, The regeneration tower also includes a cooling section located below the heating section, and the adsorption tower also has a flue gas outlet connected to the cooling section. The purified flue gas is introduced into the cooling section to cool the adsorbent therein.

4. The adsorbent regeneration and flue gas cooling coupled system according to claim 3, characterized in that, The regeneration tower also has a suction port, which is connected to the heating section to discharge water vapor from the adsorbent.

5. The adsorbent regeneration and flue gas cooling coupled system according to any one of claims 2-4, characterized in that, It also includes a second heat exchanger, which has a second hot-side inlet connected to the outlet of the first circulation pipeline, a second hot-side outlet connected to the inlet of the cooling tower, a second cold-side inlet, and a second cold-side outlet connected to the inlet of the cooling tower. The spray liquid discharged from the outlet of the first circulation pipeline exchanges heat with the cooling medium introduced into the first cold-side inlet in the second heat exchanger. The cooled medium after heat exchange is introduced into the cooling tower through the inlet of the cooling tower to exchange heat with the spray liquid supplied into the cooling tower and sprayed out through the inlet of the cooling tower.

6. The adsorbent regeneration and flue gas cooling coupled system according to claim 5, characterized in that, The cooling tower also includes a spray element, which is disposed in the inner cavity of the cooling tower and communicates with the liquid inlet of the cooling tower. The inlet of the cooling tower, the spray element and the outlet of the cooling tower are arranged sequentially from bottom to top in the height direction of the cooling tower.

7. The adsorbent regeneration and flue gas cooling coupled system according to claim 6, characterized in that, The outlet of the cooling tower is connected to the absorber inlet and / or the condenser inlet of the absorption chiller for cooling the absorber and / or the condenser of the absorption chiller.

8. The adsorbent regeneration and flue gas cooling coupled system according to claim 7, characterized in that, It also includes a third heat exchanger having a third cold-side inlet, a third cold-side outlet connected to the inlet of the cooling tower, a third hot-side inlet connected to the absorber outlet of the absorption chiller and / or the condenser outlet of the absorption chiller, and a third hot-side outlet connected to the liquid inlet of the cooling tower, so that the liquid discharged from the absorber outlet of the absorption chiller and / or the condenser outlet of the absorption chiller exchanges heat with the spray liquid sprayed by the spray element in the cooling tower.

9. The adsorbent regeneration and flue gas cooling coupled system according to any one of claims 6-8, characterized in that, It also includes a water treatment component, which has an inlet and a outlet. The inlet is connected to the bottom of the spray tower, and the outlet is connected between the outlet of the first circulation pipeline and the second hot-side inlet, so as to purify the spray liquid discharged from the spray tower and then introduce it into the cooling tower.

10. The adsorbent regeneration and flue gas cooling coupled system according to claim 9, characterized in that, The water treatment component includes a regulating element connected between the inlet and the outlet for adjusting the pH value of the spray liquid discharged from the spray cooling tower.

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