Ammonia gas recovery equipment and denitration system

Abstract

The invention discloses ammonia gas recovery equipment and a denitration system. Wherein the ammonia gas recovery equipment is used for the denitration reactor, the ammonia gas recovery equipment comprises an ammonia adsorption tower, an ammonia desorption tower and a heat exchanger, the ammonia adsorption tower is used for adsorbing ammonia gas by adopting an ammonia adsorbent, the ammonia desorption tower is used for removing ammonia gas in the ammonia adsorbent, and the ammonia adsorbent is solid adsorption particles; the heat exchanger comprises a first heat exchange flow path and a second heat exchange flow path, the first heat exchange flow path is used for being connected between a high-temperature flue gas outlet of the denitration reactor and a gas inlet of the ammonia adsorption tower, and the first heat exchange flow path and the second heat exchange flow path exchange heat so as to transfer heat of high-temperature flue gas to the second heat exchange flow path; a gas inlet of the ammonia desorption tower is communicated with an outlet of the second heat exchange flow path, so that high-temperature gas discharged from the second heat exchange flow path is used for removing ammonia gas. The ammonia gas recovery equipment disclosed by the invention can be used for recovering the ammonia gas which is discharged by the denitration reactor and does not participate in the reaction, and also can be used for recycling the heat of the high-temperature flue gas discharged by the denitration reactor.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of flue gas denitration technology, in particular to an ammonia recovery equipment and a denitration system. BACKGROUND

[0002] Nitrogen oxide (NOx) is a kind of gas which is harmful to the environment and human health, and fuel combustion is one of the main sources of NOx, mainly including thermal type, fuel type and rapid type NOx. The currently widely used NOx removal methods mainly include selective non-catalytic reduction technology (SNCR) and selective catalytic reduction technology (SCR), SNCR uses ammonia or urea to reduce NOx in the temperature range of 850-1100 DEG C, and SCR uses ammonia, urea, liquid ammonia and other reducing agents to reduce NOx to nitrogen and water under the action of catalyst at low temperature.

[0003] However, in the application process, due to the uneven flow distribution of the reducing agent spray gun, the low temperature of the flue gas, the blockage of the catalyst, the reduction of the denitration efficiency, the poor atomization effect of the spray gun, the combustion load fluctuation of the equipment and other reasons, the NOx in the flue gas cannot be completely reacted with the reducing agent (ammonia, liquid ammonia, urea), and the outlet flue gas contains ammonia which does not participate in the reaction, thereby causing secondary pollution. SUMMARY

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present application is to provide an ammonia recovery equipment which can recover ammonia which does not participate in the reaction and reduce secondary pollution.

[0005] According to the ammonia recovery equipment of the first aspect of the present application, for the denitration reactor, comprising: an ammonia adsorption tower and an ammonia desorption tower, the ammonia adsorption tower is used to adsorb ammonia by using ammonia adsorbent, and the ammonia desorption tower is used to remove ammonia in the ammonia adsorbent, and the ammonia adsorbent is a solid adsorption particle; a heat exchanger, the heat exchanger comprises a first heat exchange flow path and a second heat exchange flow path, the first heat exchange flow path is connected between the high-temperature flue gas outlet of the denitration reactor and the gas inlet of the ammonia adsorption tower, and the first heat exchange flow path and the second heat exchange flow path exchange heat to transfer the heat of the high-temperature flue gas to the second heat exchange flow path, and the gas inlet of the ammonia desorption tower and the outlet of the second heat exchange flow path are communicated to remove ammonia by using the high-temperature gas discharged from the second heat exchange flow path.

[0006] The ammonia recovery device according to the embodiment of the present application recovers the ammonia gas in the high-temperature flue gas discharged from the denitration reactor by using the ammonia adsorbent to adsorb the ammonia gas in the ammonia adsorption tower, reduces the direct discharge of the flue gas, and reduces the secondary pollution problem caused by the ammonia gas in the flue gas to the environment; the heat of the high-temperature flue gas discharged from the denitration reactor is recovered by using the heat of the high-temperature flue gas in the heat exchanger, the gas is heated into high-temperature gas, and the high-temperature gas is introduced into the ammonia desorption tower to remove the ammonia gas, thereby realizing the recovery and utilization of the heat of the high-temperature flue gas discharged from the denitration reactor and the recovery of the ammonia gas, fully and reasonably utilizing the energy and the material, improving the utilization rate of the energy and the material, and reducing the production cost.

[0007] In some embodiments, the ammonia adsorption tower and the ammonia desorption tower each comprise a tower body and at least one matching assembly, the tower body is formed with an accommodating space and a gas outlet, the gas outlet is communicated with the gas inlet through the accommodating space, the matching assembly is arranged in the accommodating space, the matching assembly comprises a shell, the shell has an accommodating cavity for accommodating the ammonia adsorbent, a side wall of the shell is formed with a communication hole, the shell divides the accommodating space into a plurality of subspaces, and the accommodating cavities of adjacent two subspaces are communicated through the communication hole.

[0008] In some embodiments, a plurality of baffles are arranged in the accommodating space and are spaced apart in a set direction, edges of the baffles are connected with inner walls of the accommodating space, the matching assembly is arranged through the baffles, and an outer peripheral surface of the shell is connected with the baffles.

[0009] The baffles are formed with openings, and the openings of adjacent baffles are respectively located on two sides of the matching assembly perpendicular to the set direction.

[0010] In the set direction, the gas inlet and the gas outlet are respectively located on two sides of the plurality of baffles, the openings of adjacent baffles are respectively located on two sides of the matching assembly perpendicular to the set direction, and the openings of adjacent baffles are respectively located on two sides of the matching assembly perpendicular to the set direction.

[0011] In some embodiments, the shell has a feeding port at an upper end and a discharging port at a lower end, the feeding port and the discharging port are communicated with the accommodating cavity, the matching assembly comprises a plurality of partitions, the plurality of partitions are arranged and spaced apart in an up-down direction to divide the accommodating cavity into a plurality of subcavities, and the partitions are movable to communicate or separate adjacent subcavities.

[0012] In some embodiments, an ammonia concentration detector is arranged at the gas inlet and an opening adjacent to the gas inlet, and the partitions are configured to communicate or separate adjacent subcavities according to a detection result of the ammonia concentration detector.

[0013] In some embodiments, the feeding port of the ammonia adsorption tower is used to add ammonia adsorbent to the ammonia adsorption tower, and the discharging port of the ammonia adsorption tower is used to discharge the ammonia adsorbent in the ammonia adsorption tower.

[0014] The feeding port of the ammonia desorption tower is used to add ammonia adsorbent to the ammonia desorption tower, and the discharging port of the ammonia desorption tower is used to discharge the ammonia adsorbent in the ammonia desorption tower.

[0015] The ammonia recovery device further comprises a conveying assembly, which is used to convey the ammonia adsorbent from the discharging port of the ammonia adsorption tower to the feeding port of the ammonia desorption tower and to convey the ammonia adsorbent from the discharging port of the ammonia desorption tower to the feeding port of the ammonia adsorption tower.

[0016] In some embodiments, the ammonia adsorption tower and the ammonia desorption tower each comprise a plurality of matching assemblies for containing ammonia adsorbent, and each comprise a feeding bin and a discharging bin, the feeding bin is connected with the feeding port of the matching assembly, and the discharging bin is connected with the discharging port of the matching assembly.

[0017] The conveying assembly is located below the discharging bin, so that the ammonia adsorbent falls from the discharging bin to the conveying assembly.

[0018] A connecting pipe is located above the feeding bin, the connecting pipe comprises a main pipe and branch pipes, one end of the main pipe is connected with the branch pipes, the branch pipes are connected with the feeding bins one by one, a discharging end of the conveying assembly is located above the other end of the main pipe, and the other end of the main pipe is formed into the feeding port.

[0019] In some embodiments, the ammonia recovery device further comprises a communication bin, which is located below the discharging bin and is connected with the discharging bins, the conveying assembly is arranged in the communication bin, and a downstream side opening of the communication bin is formed into the discharging port.

[0020] The second aspect of the present application further provides a denitration system.

[0021] The denitration system according to the second aspect of the present application comprises a denitration reactor and the ammonia recovery device according to any one of the embodiments of the first aspect of the present application, the flue gas inlet of the denitration reactor is connected with the gas outlet of the ammonia desorption tower, and the high-temperature flue gas outlet of the denitration reactor is connected with the inlet of the first heat exchange flow path of the heat exchanger.

[0022] According to the denitration system of the second aspect of the embodiment of the present application, the flue gas inlet of the denitration reactor is communicated with the gas outlet of the ammonia desorption tower, that is, the ammonia gas desorbed from the ammonia desorption tower can be re-input into the denitration reactor to participate in the reduction process of the nitrogen oxides, so that the material is fully used, and the amount of ammonia gas escaping to the external environment is reduced. The high-temperature flue gas outlet of the denitration reactor is communicated with the inlet of the first heat exchange flow path of the heat exchanger, so as to facilitate the heat exchange to heat the gas in the second heat exchange flow path by using the heat of the high-temperature flue gas, and finally used for the desorption of the ammonia gas of the ammonia adsorbent in the ammonia desorption tower.

[0023] In some embodiments, the flue gas inlet of the denitration reactor is provided with an ammonia concentration detector, and the ammonia concentration detector is arranged between the flue gas inlet of the denitration reactor and the gas outlet of the ammonia desorption tower.

[0024] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter in the description of embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the description of embodiments of the present application, taken in conjunction with the following drawings in which:

[0026] Figure 1 It is a structural schematic diagram of the denitration system of the embodiment of the present application;

[0027] Figure 2 It is a structural schematic diagram of the ammonia adsorption tower or the ammonia desorption tower of the embodiment of the present application.

[0028] Reference Signs:

[0029] Ammonia gas recovery device 100;

[0030] Ammonia adsorption tower 10; gas inlet 101 of ammonia adsorption tower 10; gas outlet 102 of ammonia adsorption tower 10;

[0031] Ammonia desorption tower 20; gas inlet 201 of ammonia desorption tower 20; gas outlet 202 of ammonia desorption tower 20;

[0032] Heat exchanger 30;

[0033] Denitration reactor 40; high-temperature flue gas outlet 401; flue gas inlet 402;

[0034] Tower body 50;

[0035] Accommodation space 501; gas outlet 502; gas inlet 503; sub-space 504;

[0036] Baffle 505; opening 506;

[0037] Fitting assembly 60;

[0038] housing 601; feed port 602; discharge port 603; containing cavity 604;

[0039] partition plate 605; sub-cavity 606; feed bin 701; discharge bin 702; communication bin 703;

[0040] De-nitrification system 200. DETAILED DESCRIPTION

[0041] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification of the present application and claims and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification of the present application and claims or the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0043] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium; can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the following three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0045] In the embodiments of the present application, the same reference signs denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length, width and other dimensions of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0046] The "plurality" appearing in the present application refers to two or more (including two).

[0047] The ammonia recovery device 100 and the denitration system 200 of the present application will be described below in conjunction with Figure 1 and Figure 2 .

[0048] The ammonia recovery device 100 according to the first aspect of the present application is used in the denitration reactor 40. The denitration reactor 40 in the embodiments of the present application can be a denitration reactor 40 using selective non-catalytic reduction technology (SNCR), or can be a denitration reactor 40 using selective catalytic reduction technology (SCR). The reducing agent used by the denitration reactor 40 is not specifically limited here, as long as the denitration reactor 40 contains ammonia gas in the outlet flue gas, the ammonia recovery device 100 in the embodiments of the present application can be used to recover ammonia gas.

[0049] As shown in Figure 1 , the ammonia recovery device 100 according to the first aspect of the present application comprises an ammonia adsorption tower 10, an ammonia desorption tower 20 and a heat exchanger 30, the ammonia adsorption tower 10 is used to adsorb ammonia gas using ammonia adsorbent; the ammonia desorption tower 20 is used to remove ammonia gas in the ammonia adsorbent; that is, the ammonia adsorbent can adsorb ammonia gas, and can also desorb ammonia gas under certain conditions.

[0050] The heat exchanger 30 comprises a first heat exchange flow path and a second heat exchange flow path, the first heat exchange flow path is connected between the high-temperature flue gas outlet 401 of the denitration reactor 40 and the gas inlet 101 of the ammonia adsorption tower 10, the first heat exchange flow path and the second heat exchange flow path exchange heat to transfer the heat of the high-temperature flue gas to the second heat exchange flow path, the gas inlet 201 of the ammonia desorption tower 20 and the outlet of the second heat exchange flow path are communicated to remove ammonia gas using the high-temperature gas discharged from the second heat exchange flow path.

[0051] The ammonia adsorption tower 10 is used to adsorb ammonia gas by using ammonia adsorbent; that is, the ammonia adsorption tower 10 stores the ammonia adsorbent used for adsorbing ammonia gas, and the flue gas containing ammonia gas enters the ammonia adsorption tower 10 from the gas inlet 101 of the ammonia adsorption tower 10, and is adsorbed by the ammonia adsorbent. The flue gas after removal of ammonia gas is discharged from the gas outlet 102 of the ammonia adsorption tower 10, for example, to the external environment. By setting the ammonia adsorption tower 10 to adsorb the ammonia gas in the flue gas discharged from the denitration reactor 40, the ammonia gas not participating in the reaction is recovered, and the direct discharge of the flue gas is reduced, thereby reducing the problem of secondary pollution of the ammonia gas in the flue gas to the environment.

[0052] The ammonia desorption tower 20 is used to remove ammonia gas from the ammonia adsorbent. It can be understood that the ammonia adsorbent in the ammonia desorption tower 20 is ammonia adsorbent that has absorbed ammonia gas, for example, ammonia adsorbent that has adsorbed ammonia gas to a saturated state. By removing the ammonia gas from the ammonia adsorbent in the ammonia desorption tower 20, the removed ammonia gas can be reused, and the ammonia adsorbent can also be reused to adsorb ammonia gas, thereby reducing the generation of waste and achieving the full use and recycling of production materials, which is environmentally friendly.

[0053] It should be noted that the temperature of the high-temperature flue gas outlet 401 of the denitration reactor 40 is usually 100-300°C. The first heat exchange flow path is connected between the high-temperature flue gas outlet 401 of the denitration reactor 40 and the gas inlet 101 of the ammonia adsorption tower 10, and the first heat exchange flow path and the second heat exchange flow path exchange heat to transfer the heat of the high-temperature flue gas to the second heat exchange flow path. The gas inlet 201 of the ammonia desorption tower 20 is communicated with the outlet of the second heat exchange flow path to use the high-temperature gas discharged from the second heat exchange flow path for ammonia gas removal. After heat exchange, the temperature at the gas inlet 101 of the ammonia adsorption tower 10 is usually 40-50°C, and the temperature at the gas inlet 201 of the ammonia desorption tower 20 is usually 100-200°C. Exemplarily, the inlet of the second heat exchange flow path can be communicated with the external environment to allow ambient air to enter the second heat exchange flow path to be heated.

[0054] From the above, by providing the heat exchanger 30, on the one hand, the heat exchanger 30 can realize the cooling of the high-temperature flue gas discharged from the denitration reactor 40, and the cooled flue gas enters the ammonia adsorption tower 10 for ammonia gas adsorption process, which is conducive to improving the ammonia adsorption rate of the ammonia adsorption tower 10; on the other hand, air or other gas can be introduced into the inlet of the second heat exchange flow path, and the heat of the high-temperature flue gas discharged from the denitration reactor 40 is used to heat the gas introduced into the second heat exchange flow path to form high-temperature gas, which is discharged. The discharged high-temperature gas enters the ammonia desorption tower 20 to remove the ammonia on the ammonia adsorbent in the ammonia desorption tower 20. Thus, the heat of the high-temperature flue gas discharged from the denitration reactor 40 is recycled and utilized, the energy is fully and reasonably utilized, the energy utilization rate is improved, and the production cost is reduced.

[0055] According to the ammonia recovery device 100 of the embodiment of the present application, ammonia is adsorbed by the ammonia adsorbent provided in the ammonia adsorption tower 10, so that the ammonia gas not involved in the reaction in the high-temperature flue gas discharged from the denitration reactor 40 is recovered, the flue gas is directly discharged, and the problem of secondary pollution caused by the ammonia gas in the flue gas to the environment is reduced. The heat of the high-temperature flue gas discharged from the denitration reactor 40 is recovered and utilized by the heat exchanger 30, and the ammonia gas is removed by the high-temperature gas heated by the heat exchanger 30 and introduced into the ammonia desorption tower 20, so that the heat of the high-temperature flue gas discharged from the denitration reactor 40 is recovered and utilized, and the energy and the material are fully and reasonably utilized, the utilization rate of the energy and the material is improved, and the production cost is reduced.

[0056] In some embodiments, the ammonia adsorption tower 10 and the ammonia desorption tower 20 can be referred to Figure 2 , the ammonia adsorption tower 10 and the ammonia desorption tower 20 each include a tower body 50 and at least one matching assembly 60, the tower body 50 is formed with an accommodation space 501 and a gas outlet 502, the gas outlet 502 is communicated with the accommodation space 501 and a gas inlet 503, the matching assembly 60 is arranged in the accommodation space 501, the matching assembly 60 includes a shell 601, the shell 601 has an accommodation cavity 604 for accommodating the ammonia adsorbent, a side wall of the shell 601 is formed with a communication hole, the shell 601 divides the accommodation space 501 into a plurality of subspaces 504, and the accommodation cavity 604 is communicated with two adjacent subspaces 504 through the communication hole.

[0057] The ammonia adsorption tower 10 and the ammonia desorption tower 20 can be referred to Figure 2 , Figure 2 The direction indicated by the arrow in the above figure is the gas flow direction. That is, during the operation of the ammonia desorption tower 20 and the ammonia adsorption tower 10, the gas enters the accommodation space 501 from the gas inlet 503, then enters the accommodation cavity 604 from the accommodation space 501, contacts the ammonia adsorbent, and performs the ammonia adsorption or ammonia desorption process, and the gas is discharged through the gas outlet 502 after passing through the plurality of subspaces 504 and the plurality of accommodation cavities 604. The accommodation cavity 604 is communicated with two adjacent subspaces 504 through the communication hole, that is, the adjacent subspaces 504 are only communicated with each other through the communication hole on the shell 601, but not directly communicated, so as to avoid that the flue gas is directly discharged from the gas outlet 502 without passing through the matching assembly 60. Specifically, the shell 601 is provided with a plurality of communication holes on two sides in the gas flow direction, and the plurality of communication holes are beneficial to increase the gas flow area.

[0058] It should be noted that for the embodiments in which a plurality of matching assemblies 60 are provided, according to actual needs, some of the matching assemblies 60 can be provided with the ammonia adsorbent, and some of the matching assemblies 60 can not be provided with the ammonia adsorbent. It can be understood that the inner diameter of the communication hole needs to be smaller than the diameter of the particles of the ammonia adsorbent, so as to reduce the possibility of leakage of the ammonia adsorbent from the communication hole.

[0059] In the above embodiments, by arranging multiple fitting assemblies 60 in the accommodating space 501, the gas can pass through the multiple fitting assemblies 60 before being discharged, which is conducive to increasing the contact frequency between the gas and the ammonia adsorbent, and thus conducive to the full adsorption and desorption of ammonia gas.

[0060] In some embodiments, the accommodating space 501 can be arranged with multiple baffles 505 spaced apart along a certain direction, the edges of the baffles 505 being connected to the inner wall of the accommodating space 501, and the fitting assemblies 60 being arranged through the multiple baffles 505 and the outer peripheral surface of the shell 601 being connected to the baffles 505. Figure 2 The baffles 505 can be formed with openings 506, and the openings 506 of adjacent baffles 505 can be located on the two sides of the fitting assembly 60 perpendicular to the certain direction. In the certain direction, the gas inlet 503 and the gas outlet 502 can be located on the two sides of the multiple baffles 505, and the gas inlet 503 and the gas outlet 502 can be located on the two sides of the fitting assembly 60 perpendicular to the certain direction.

[0061] Specifically, the fitting assembly 60 can be provided with one or multiple fitting assemblies 60. The opening 506 can be formed by the baffle 505 itself, or the opening 506 can be defined by the baffle 505 and the inner wall of the accommodating space 501, or the opening 506 can be defined by the baffle 505, the inner wall of the accommodating space 501, and the outer peripheral surface of the shell 601.

[0062] For example, the certain direction can be the up-down direction, and correspondingly, the direction perpendicular to the certain direction can be the horizontal direction. In other embodiments, the certain direction can also be the horizontal direction or other directions.

[0063] The openings 506 of adjacent baffles 505 can be located on the two sides of the fitting assembly 60 perpendicular to the certain direction. In the certain direction, the gas inlet 503 and the gas outlet 502 can be located on the two sides of the multiple baffles 505, and the gas inlet 503 and the gas outlet 502 can be located on the two sides of the fitting assembly 60 perpendicular to the certain direction. As such, the flow path of the gas in the accommodating space 501 can be as long as possible, the ammonia adsorbent can be contacted as much as possible, and all the ammonia adsorbent can be contacted with the gas as much as possible, so as to realize more fully adsorbing or desorbing ammonia gas, improve the ammonia gas adsorption rate or desorption rate, and improve the utilization rate of the ammonia adsorbent. Here, the two sides of the fitting assembly 60 perpendicular to the certain direction refer to the two sides of the whole fitting assemblies 60 in the tower body 50 perpendicular to the certain direction.

[0064] In some embodiments, reference can be made to Figure 2 The housing 601 has an inlet 602 at the upper end and an outlet 603 at the lower end, and the inlet 602 and the outlet 603 are in communication with the accommodating cavity 604, so that the ammonia adsorbent can be added to the accommodating cavity 604 through the inlet 602, and the ammonia adsorbent in the accommodating cavity 604 can be discharged through the outlet 603.

[0065] For example, for the ammonia adsorption tower 10, when the ammonia adsorption of the ammonia adsorbent in the matching assembly 60 reaches a certain degree, the ammonia adsorbent saturated with adsorption can be discharged from the outlet 603, and the ammonia adsorbent without adsorbed ammonia or with low adsorption capacity can be added from the inlet 602. For the ammonia desorption tower 20, when the ammonia desorption of the ammonia adsorbent in the matching assembly 60 reaches a certain degree, the ammonia adsorbent with completed desorption can be discharged from the outlet 603, and the ammonia adsorbent with adsorbed ammonia or with high adsorption capacity can be added from the inlet 602.

[0066] Exemplarily, a first control valve can be arranged at the inlet 602 or a position close to the inlet 602, and a second control valve can be arranged at the outlet 603 or a position close to the outlet 603, the first control valve is used to control the opening and closing of the inlet 602, and the second control valve is used to control the opening and closing of the outlet 603. When it is not necessary to add ammonia adsorbent to the accommodating cavity 604 or to discharge the ammonia adsorbent in the accommodating cavity 604, the inlet 602 and the outlet 603 can be closed to reduce the possibility of gas escaping from the inlet 602 or the outlet 603 to the external environment.

[0067] In some embodiments, reference can be made to Figure 2 As shown in FIG. 6, the matching assembly 60 includes a plurality of partitions 605 arranged in the up-down direction to separate the accommodating cavity 604 into a plurality of sub-cavities 606, and the partitions 605 are movable to communicate or separate adjacent sub-cavities 606.

[0068] By arranging a plurality of partitions 605, under the blocking action of the partitions 605, the flue gas is not easy to flow directly along the up-down direction, but makes the flue gas flow as much as possible in a detour, thereby prolonging the contact time and contact area of the flue gas and the ammonia adsorbent. When the ammonia adsorption tower 10 or the ammonia desorption tower 20 is operated for a period of time, or the ammonia concentration at the opening 506 closest to the gas inlet 503 changes little relative to the ammonia concentration at the gas inlet 503, the outlet 603 can be opened, so that the ammonia adsorbent below the lowermost partition 605 can be discharged from the outlet 603, and then the plurality of partitions 605 above the outlet 603 are opened in sequence, so that the ammonia adsorbent fills the sub-cavities 606 below the partitions 605 in sequence, thereby realizing the replacement of the ammonia adsorbent. In this way, the flow replacement of the ammonia adsorbent is realized, and the replacement and efficiency adjustment of the adsorbent are realized without stopping.

[0069] Exemplarily, the partition plate 605 can be pulled to translate perpendicularly to the set direction, so as to switch between the communication and separation of adjacent sub-cavities 606.

[0070] In some embodiments, the baffle plates 505 and the partition plates 605 can be arranged one by one. That is, the partition plates 605 do not occupy the gas flow area of the area between the baffle plates 505 and the baffle plates 505, and at the same time, the flue gas can be prevented from directly reaching both sides of the baffle plates 505 along the matching assembly 60, so as to shorten the flow path of the flue gas.

[0071] In some embodiments, the ammonia concentration detector is arranged at the gas inlet 503 and the opening 506 adjacent to the gas inlet 503, and the partition plate 605 is configured to communicate or separate the adjacent sub-cavities 606 according to the detection result of the ammonia concentration detector.

[0072] Here, the ammonia concentration detector is arranged at the opening 506 adjacent to the gas inlet 503, which can be directly arranged at the opening 506, or can be directly arranged at both sides of the opening 506, i.e., close to the opening 506.

[0073] For example, for the ammonia adsorption tower 10, when the flue gas flows from the gas inlet 503 to the opening 506, the concentration at the opening 506 reaches 70% to 100% of the concentration at the gas inlet 503, at this time, the discharge port 603 can be opened, the multiple layers of partition plates 605 above the discharge port 603 can be opened from bottom to top in sequence, and the feeding port 602 can be opened, so that the ammonia adsorbent saturated with adsorption is discharged from the discharge port 603, the ammonia adsorbent above the partition plate 605 falls to the lower side of the partition plate 605, and the ammonia adsorbent at the feeding port 602 falls into the sub-cavity 606 below the feeding port 602, so as to realize the non-stop automatic replacement of the ammonia adsorbent in the ammonia adsorption tower.

[0074] For example, for the ammonia desorption tower 20, when the flue gas flows from the gas inlet 503 to the opening 506, the concentration at the opening 506 is close to 0 and has no obvious change, at this time, the discharge port 603 can be opened, the multiple layers of partition plates 605 above the discharge port 603 can be opened from bottom to top in sequence, and the feeding port 602 can be opened, so that the ammonia adsorbent completed with desorption is discharged from the discharge port 603, the ammonia adsorbent above the partition plate 605 falls to the lower side of the partition plate 605, and the ammonia adsorbent at the feeding port 602 falls into the sub-cavity 606 below the feeding port 602, so as to realize the non-stop automatic replacement of the ammonia adsorbent in the ammonia desorption tower.

[0075] By arranging the ammonia concentration detector, it can be conveniently judged whether the ammonia adsorbent is saturated with adsorption or completed with desorption, which is beneficial to fully utilize the ammonia adsorbent or to make the ammonia adsorbent after desorption of ammonia gas have better adsorption capacity.

[0076] In some embodiments, the ammonia adsorbent in the present application can be solid adsorption particles, which are less corrosive to the equipment and environment, safer to use, and more conducive to the desorption process of ammonia and ammonia adsorbent, and the recycling of ammonia.

[0077] In some embodiments, the feeding port of the ammonia adsorption tower 10 is used to add ammonia adsorbent to the ammonia adsorption tower 10, and the discharging port of the ammonia adsorption tower 10 is used to discharge the ammonia adsorbent in the ammonia adsorption tower 10; the feeding port of the ammonia desorption tower 20 is used to add ammonia adsorbent to the ammonia desorption tower 20, and the discharging port of the ammonia desorption tower 20 is used to discharge the ammonia adsorbent in the ammonia desorption tower 20.

[0078] It should be noted that the feeding port can be composed of one or more feeding ports 602 of the cooperating components 60, or the feeding port of the ammonia adsorption tower 10 or the ammonia desorption tower 20 can be a separate feeding port, and the feeding port is in communication with the feeding port 602 of one or more cooperating components 60. The discharging port can be composed of one or more discharging ports 603 of the cooperating components 60, or the discharging port of the ammonia adsorption tower 10 or the ammonia desorption tower 20 can be a separate discharging port, and the discharging port is in communication with the discharging port 603 of one or more cooperating components 60.

[0079] In some embodiments, the ammonia recovery device 100 further comprises a transportation component, which is used to transport the ammonia adsorbent from the discharging port of the ammonia adsorption tower 10 to the feeding port of the ammonia desorption tower 20, and to transport the ammonia adsorbent from the discharging port of the ammonia desorption tower 20 to the feeding port of the ammonia adsorption tower 10.

[0080] Specifically, the transportation component can transport the ammonia adsorbent from the discharging port to the feeding port, or the ammonia adsorbent can be transported from a position close to the discharging port to a position close to the feeding port. For example, the transportation component can be an open or partially closed conveyor belt, or a spiral conveying pipe, or a combination of the two.

[0081] By providing the transportation component, the ammonia adsorbent can be transported back and forth between the ammonia adsorption tower 10 and the ammonia desorption tower 20, so as to realize the flow-type recycling of the ammonia adsorbent.

[0082] In some embodiments, referring to Figure 2 , the ammonia adsorption tower 10 and the ammonia desorption tower 20 each comprise a plurality of cooperating components 60 for containing the ammonia adsorbent, and the ammonia adsorption tower 10 and the ammonia desorption tower 20 each comprise a feeding bin 701 and a discharging bin 702, the feeding bin 701 is connected to the feeding port 602 of the cooperating component 60, and the discharging bin 702 is connected to the discharging port 603 of the cooperating component 60.

[0083] The transport assembly is located below the discharge bin 702 so that the ammonia adsorbent falls from the discharge bin 702 to the transport assembly; the transport assembly is located above the feed bin 701 so that the ammonia adsorbent falls from the transport assembly to the feed bin 701.

[0084] Exemplarily, the connecting port on one side of the discharge bin 702 is used to connect to the discharge port 603 of the mating component 60, and the cross-sectional area of ​​the connecting port on the other side of the discharge bin 702 can be smaller than the cross-sectional area of ​​the connecting port on one side of the discharge bin 702, so as to allow the ammonia adsorbent to fall to the transport component as much as possible and reduce the possibility of the ammonia adsorbent scattering outside the transport component.

[0085] Exemplarily, the connecting port on one side of the feed bin 701 is used to connect to the feed port 602 of the mating component 60, and the cross-sectional area of ​​the connecting port on the other side of the feed bin 701 can be larger than the cross-sectional area of ​​the connecting port on one side of the feed bin 701, so as to allow the ammonia adsorbent to fall into the feed bin 701 as much as possible and reduce the possibility of the ammonia adsorbent scattering outside the feed bin 701.

[0086] In some embodiments, the ammonia adsorption tower 10 and the ammonia desorption tower 20 both include connecting pipes, which are located above the feed bin 701. The connecting pipes include a main pipe and branch pipes. One end of the main pipe is connected to multiple branch pipes, and the multiple branch pipes are connected one-to-one to multiple feed bins 701. The unloading end of the transport component is located above the other end of the main pipe, and the other end of the main pipe is formed as a feeding port.

[0087] Connecting pipes are provided to connect multiple feed bins 701. The transport assembly is located above the feed port. Ammonia adsorbent dropped from the discharge end of the transport assembly falls into the feed port, then enters the feed bin 701 via the main pipe and multiple branch pipes, and then enters the feed port 602 of the mating assembly 60, thereby completing the feeding process of the mating assembly 60. The provision of connecting pipes allows for automatic feeding of multiple mating assemblies 60, reducing the possibility of ammonia adsorbent falling into the ammonia adsorption tower 10 or outside the ammonia adsorption tower 10.

[0088] In some embodiments, reference may be made to Figure 2 The ammonia recovery equipment 100 also includes a connecting bin 703, which is arranged below the discharge bin 702, and multiple discharge bins 702 are connected to the connecting bin 703, the transportation component is passed through the connecting bin 703, and the downstream side opening of the connecting bin 703 is formed as a discharge port.

[0089] In operation, the conveying assembly is arranged in the communication bin 703, and the ammonia adsorbent discharged from the discharge port 603 of the matching assembly 60 will enter the communication bin 703 from the discharge bin 702, fall onto the conveying assembly in the communication bin 703, and be conveyed out of the discharge port by the conveying assembly. By arranging the communication bin 703, the influence of wind and the like on the falling material can be reduced, and even if a small amount of ammonia adsorbent falls outside the conveying assembly, it will fall into the communication bin 703, thereby reducing the possibility of ammonia adsorbent falling into the environment and facilitating subsequent cleaning and collection of ammonia adsorbent.

[0090] In other embodiments, the conveying assembly can also not be arranged in the communication bin 703, and the ammonia adsorbent in the communication bin 703 is moved by the pushing force of external material, that is, the ammonia adsorbent on the upstream side pushes the ammonia adsorbent on the downstream side to move, so that the ammonia adsorbent can be discharged from the downstream opening 506 of the communication bin 703.

[0091] The second aspect of the present application also provides a denitration system 200.

[0092] Reference can be made to Figure 1 The denitration system 200 according to the second aspect of the present application comprises a denitration reactor 40 and the ammonia gas recovery device 100 according to any one of the embodiments of the first aspect of the present application. The flue gas inlet 402 of the denitration reactor 40 is in communication with the gas outlet 202 of the ammonia desorption tower 20, and the high-temperature flue gas outlet 401 of the denitration reactor 40 is in communication with the inlet of the first heat exchange flow path of the heat exchanger 30.

[0093] The denitration system 200 according to the second aspect of the present application, the flue gas inlet 402 of the denitration reactor 40 is in communication with the gas outlet 202 of the ammonia desorption tower 20, that is, the ammonia gas desorbed from the ammonia desorption tower 20 can be re-introduced into the denitration reactor 40 to participate in the reduction process of nitrogen oxides, thereby achieving full use of the material and reducing the amount of ammonia gas escaping into the external environment. The high-temperature flue gas outlet 401 of the denitration reactor 40 is in communication with the inlet of the first heat exchange flow path of the heat exchanger 30, so that the heat exchanger 30 can use the heat of the high-temperature flue gas to heat the gas in the second heat exchange flow path, and ultimately be used for the desorption of the ammonia gas of the ammonia adsorbent in the ammonia desorption tower 20.

[0094] In some embodiments, the flue gas inlet 402 of the denitration reactor 40 is provided with an ammonia concentration detector, and the flue gas inlet 402 of the denitration reactor 40 and the gas outlet 202 of the ammonia desorption tower 20 are provided with an ammonia concentration detector.

[0095] For example, the flue gas inlet 402 of the denitration reactor 40 and the gas outlet 202 of the ammonia desorption tower 20 can be in communication through a pipeline, and the pipeline is provided with an ammonia concentration detector, or the gas outlet 202 of the ammonia desorption tower 20 is provided with an ammonia concentration detector, so as to detect the concentration of ammonia gas in the gas discharged from the ammonia desorption tower 20.

[0096] When the ammonia concentration detector between the flue gas inlet 402 of the denitration reactor 40 and the gas outlet 202 of the ammonia desorption column 20 detects that the ammonia concentration is too high, the amount of reducing agent added to the denitration reactor 40 can be reduced so that the ammonia concentration at the flue gas inlet 402 of the denitration reactor 40 is reduced to avoid excessive use of reducing agent.

[0097] In other embodiments, if the ammonia adsorbent reaches saturation too quickly according to the ammonia concentration detector near the opening 506 of the gas inlet 101 of the ammonia adsorption column 10, it can also reflect that the reducing agent of the denitration reactor 40 is used excessively, at this time, the amount of reducing agent added to the denitration reactor 40 can also be reduced.

[0098] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0099] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. An ammonia recovery device, characterized in that: For a denitrification reactor (40), comprising: an ammonia adsorption tower (10) and an ammonia desorption tower (20), wherein the ammonia adsorption tower (10) is used to adsorb ammonia gas using an ammonia adsorbent, and the ammonia desorption tower (20) is used to remove ammonia gas from the ammonia adsorbent, wherein the ammonia adsorbent is solid adsorption particles; A heat exchanger (30), the heat exchanger (30) comprising a first heat exchange flow path and a second heat exchange flow path, the first heat exchange flow path being used to connect between the high-temperature flue gas outlet (401) of the denitration reactor (40) and the air inlet (101) of the ammonia adsorption tower (10), the first heat exchange flow path and the second heat exchange flow path exchanging heat to transfer the heat of the high-temperature flue gas to the second heat exchange flow path, the air inlet (201) of the ammonia desorption tower (20) and the outlet of the second heat exchange flow path being connected to utilize the high-temperature gas discharged from the second heat exchange flow path to remove ammonia.

2. The ammonia recovery equipment according to claim 1, characterized in that: The ammonia adsorption tower (10) and the ammonia desorption tower (20) both include a tower body (50) and at least one matching component (60), wherein the tower body (50) is formed with a accommodating space (501) and an air outlet (502), wherein the air outlet (502) is communicated with the air inlet (503) through the accommodating space (501), and the matching component (60) is arranged in the accommodating space (501), and the matching component (60) includes a shell (601), wherein the shell (601) has an accommodating cavity (604) for accommodating the ammonia adsorbent, and a connecting hole is formed on the side wall of the shell (601), wherein the shell (601) divides the accommodating space (501) into a plurality of subspaces (504), and the accommodating cavity (604) is connected to two adjacent subspaces (504) through the connecting hole.

3. The ammonia recovery equipment according to claim 2, characterized in that: A plurality of baffles (505) spaced apart along a set direction are arranged in the accommodating space (501), the edges of the baffles (505) are connected to the inner wall of the accommodating space (501), the matching assembly (60) is passed through the plurality of baffles (505), and the outer peripheral surface of the shell (601) is connected to the baffles (505); The baffle (505) is formed with an opening (506), and the openings (506) of adjacent baffles (505) are respectively located on both sides of the matching component (60) perpendicular to the set direction; In the set direction, the air inlet (503) and the air outlet (502) are respectively located on both sides of the plurality of baffles (505); the air inlet (503) and the openings (506) of the adjacent baffles (505) are respectively located on both sides of the matching component (60) perpendicular to the set direction; and the air outlet (502) and the openings (506) of the adjacent baffles (505) are respectively located on both sides of the matching component (60) perpendicular to the set direction.

4. The ammonia recovery equipment according to claim 3, characterized in that: The shell (601) has a feed port (602) at its upper end and a discharge port (603) at its lower end. The feed port (602) and the discharge port (603) are connected to the accommodating cavity (604). The mating component (60) includes a plurality of partitions (605). The plurality of partitions (605) are spaced apart and arranged in an up-down direction to divide the accommodating cavity (604) into a plurality of sub-cavities (606). The partitions (605) are movable to connect or separate adjacent sub-cavities (606).

5. The ammonia recovery equipment according to claim 4, characterized in that: An ammonia concentration detector is provided at the air inlet (503) and at the opening (506) adjacent to the air inlet (503), and the partition (605) is configured to connect or separate adjacent sub-cavities (606) according to the detection result of the ammonia concentration detector.

6. The ammonia recovery equipment according to any one of claims 1 to 5, characterized in that: The feed port of the ammonia adsorption tower (10) is used to add ammonia adsorbent to the ammonia adsorption tower (10), and the discharge port of the ammonia adsorption tower (10) is used to discharge the ammonia adsorbent in the ammonia adsorption tower (10); The feed port of the ammonia desorption tower (20) is used to add an ammonia adsorbent to the ammonia desorption tower (20), and the discharge port of the ammonia desorption tower (20) is used to discharge the ammonia adsorbent in the ammonia desorption tower (20); The ammonia recovery equipment (100) further includes a transport component, which is used to transport the ammonia adsorbent from the discharge port of the ammonia adsorption tower (10) to the feed port of the ammonia desorption tower (20) and to transport the ammonia adsorbent from the discharge port of the ammonia desorption tower (20) to the feed port of the ammonia adsorption tower (10).

7. The ammonia recovery equipment according to claim 6, characterized in that: The ammonia adsorption tower (10) and the ammonia desorption tower (20) both comprise a plurality of matching components (60) for accommodating ammonia adsorbents, and the ammonia adsorption tower (10) and the ammonia desorption tower (20) both comprise a feed bin (701) and a discharge bin (702), the feed bin (701) being connected to the feed port (602) of the matching component (60), and the discharge bin (702) being connected to the discharge port (603) of the matching component (60); The transport component is located below the discharge bin (702) so that the ammonia adsorbent falls from the discharge bin (702) to the transport component; A connecting pipe, the connecting pipe is located above the feed bin (701), the connecting pipe includes a main pipe and branch pipes, one end of the main pipe is connected to multiple branch pipes, and the multiple branch pipes are connected to multiple feed bins (701) one by one, the unloading end of the transport component is located above the other end of the main pipe, and the other end of the main pipe is formed as the feeding port.

8. The ammonia recovery equipment according to claim 7, characterized in that: It also includes a connecting bin (703), which is arranged below the discharge bin (702), and multiple discharge bins (702) are connected to the connecting bin (703), the transport component is passed through the connecting bin (703), and the downstream side opening (506) of the connecting bin (703) is formed as the discharge port.

9. A denitrification system, characterized in that: comprising a denitration reactor (40) and an ammonia recovery device (100) according to any one of claims 1 to 8; The flue gas inlet (402) of the denitration reactor (40) is connected to the gas outlet (202) of the ammonia desorption tower (20), and the high-temperature flue gas outlet (401) of the denitration reactor (40) is connected to the inlet of the first heat exchange flow path of the heat exchanger (30).

10. The denitration system according to claim 9, characterized in that: The flue gas inlet (402) of the denitration reactor (40) is provided with an ammonia concentration detector, and an ammonia concentration detector is provided between the flue gas inlet (402) of the denitration reactor (40) and the gas outlet (202) of the ammonia desorption tower (20).

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