Ammonia recovery apparatus and denitration system

Abstract

The utility model discloses a kind of ammonia recovery equipment and denitration system.Ammonia recovery equipment is used for denitration reactor, and ammonia recovery equipment includes: ammonia adsorption tower, ammonia adsorption tower is used to adopt ammonia adsorbent adsorption ammonia gas;Ammonia desorption tower, ammonia desorption tower is used to remove ammonia gas in ammonia adsorbent;Heat exchanger, heat exchanger includes first heat exchange flow path and second heat exchange flow path, first heat exchange flow path is used to connect between the high-temperature flue gas outlet of denitration reactor and the adsorption inlet of ammonia adsorption tower, first heat exchange flow path and second heat exchange flow path heat exchange, to pass the heat of high-temperature flue gas to second heat exchange flow path, the desorption inlet of ammonia desorption tower and the outlet of second heat exchange flow path are communicated, to utilize the high-temperature gas of second heat exchange flow path discharge to carry out ammonia gas removal.The utility model's ammonia recovery equipment can recover the ammonia gas of denitration reactor discharge that does not participate in reaction, reduce secondary pollution, and simultaneously can also realize the recycling of the heat of high-temperature flue gas of denitration reactor discharge.

Description

Technical Field

[0001] This utility model relates to the field of flue gas denitrification technology, and in particular to an ammonia recovery device and a denitrification system. Background Technology

[0002] Nitrogen oxides (NOx) are gases harmful to both the environment and human health. Fuel combustion is one of the main sources of NOx, which can be categorized into thermal, fuel-based, and rapid NOx. Currently, the most widely used NOx removal methods are selective non-catalytic reduction (SNCR) and selective catalytic reduction (SCR). SNCR uses ammonia or urea to reduce NOx within a temperature range of 850℃-1100℃, while SCR uses reducing agents such as ammonia, urea, or liquid ammonia under low-temperature conditions with the aid of a catalyst to reduce NOx to nitrogen and water.

[0003] However, during application, due to uneven distribution of reducing agent spray gun flow, low flue gas temperature, catalyst blockage, decreased denitrification efficiency, poor spray gun atomization effect, and fluctuations in equipment combustion load, NOx in the flue gas cannot completely react with the reducing agent (ammonia, liquid ammonia, urea), resulting in unreacted ammonia in the outlet flue gas, thus causing secondary pollution. Utility Model Content

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide an ammonia recovery device that can recover unreacted ammonia gas, thereby reducing secondary pollution.

[0005] According to a first aspect of the present invention, an ammonia recovery device is used in a denitrification reactor, comprising: an ammonia adsorption tower for adsorbing ammonia using an ammonia adsorbent; an ammonia desorption tower for removing ammonia from the ammonia adsorbent; and a heat exchanger comprising a first heat exchange path and a second heat exchange path, wherein the first heat exchange path is connected between the high-temperature flue gas outlet of the denitrification reactor and the adsorption inlet of the ammonia adsorption tower, the first heat exchange path and the second heat exchange path exchange heat to transfer the heat of the high-temperature flue gas to the second heat exchange path, and the desorption inlet of the ammonia desorption tower is connected to the outlet of the second heat exchange path to remove ammonia using the high-temperature gas discharged from the second heat exchange path.

[0006] According to the ammonia recovery equipment of this utility model embodiment, by setting up an ammonia adsorption tower to adsorb ammonia with an ammonia adsorbent, the ammonia that has not participated in the reaction in the high-temperature flue gas discharged from the denitrification reactor is recovered, reducing the direct discharge of flue gas and preventing secondary pollution of the environment caused by ammonia in the flue gas; by setting up a heat exchanger, the heat exchanger uses the heat of the high-temperature flue gas from the denitrification reactor to heat the gas into a high-temperature gas and pass it into the ammonia desorption tower for ammonia removal. Thus, the heat of the high-temperature flue gas discharged from the denitrification reactor and the recovery of ammonia are realized, making full and rational use of energy and materials, improving the utilization rate of energy and materials, and helping to reduce production costs.

[0007] In some embodiments, both the ammonia adsorption tower and the ammonia desorption tower include a tower body and at least one cooperating component. The tower body forms a receiving space, an outlet, and an inlet. The outlet communicates with the inlet through the receiving space. The inlet of the tower body of the ammonia adsorption tower is formed as the adsorption inlet, and the inlet of the tower body of the ammonia desorption tower is formed as the desorption inlet. The cooperating component is disposed in the receiving space. The cooperating component includes a shell. The shell has a receiving cavity for receiving the ammonia adsorbent. A connecting hole is formed on the side wall of the shell. The shell divides the receiving space into multiple sub-spaces. The receiving cavity communicates with two adjacent sub-spaces through the connecting hole.

[0008] In some embodiments, a plurality of baffles spaced apart along a predetermined direction are arranged in the receiving space, the edges of the baffles are connected to the inner wall of the receiving space, the mating components pass through the plurality of baffles and the outer peripheral surface of the housing is connected to the baffles;

[0009] The baffle has an opening, and the openings of adjacent baffles are respectively located on both sides of the mating assembly perpendicular to a set direction;

[0010] In a set direction, the air inlet and the air outlet are respectively located on both sides of the plurality of baffles. The air inlet and the opening of the adjacent baffle are respectively located on both sides of the mating assembly perpendicular to the set direction. The air outlet and the opening of the adjacent baffle are respectively located on both sides of the mating assembly perpendicular to the set direction.

[0011] In some embodiments, the upper end of the housing has a feed inlet and the lower end of the housing has a discharge outlet. The feed inlet and the discharge outlet are in communication with the receiving cavity. The mating assembly includes a plurality of partitions. The plurality of partitions are arranged at intervals in the vertical direction to divide the receiving cavity into a plurality of sub-cavities. The partitions are movable to connect or separate adjacent sub-cavities.

[0012] In some embodiments, an ammonia concentration detector is provided at the air inlet and at an opening adjacent to the air inlet, and the partition is configured to connect or separate adjacent sub-cavities based on the detection result of the ammonia concentration detector.

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

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

[0015] The ammonia recovery equipment also includes a transport component for transporting the ammonia adsorbent from the discharge port of the ammonia adsorption tower to the feed port of the ammonia desorption tower, and for transporting the ammonia adsorbent from the discharge port of the ammonia desorption tower to the feed port of the ammonia adsorption tower.

[0016] In some embodiments, both the ammonia adsorption tower and the ammonia desorption tower include multiple coordinated components for containing ammonia adsorbent. Both the ammonia adsorption tower and the ammonia desorption tower include a feed bin and a discharge bin. The feed bin is connected to the feed inlet of the coordinated component, and the discharge bin is connected to the discharge outlet of the coordinated component.

[0017] The transport assembly is located below the discharge hopper so that the ammonia adsorbent falls from the discharge hopper onto the transport assembly;

[0018] A connecting pipe is located above the feeding hopper. The connecting pipe includes a main pipe and branch pipes. One end of the main pipe is connected to a plurality of branch pipes, and the plurality of branch pipes are connected to a plurality of feeding hoppers in a corresponding manner. The discharge end of the transport component is located above the other end of the main pipe, and the other end of the main pipe forms the feeding port.

[0019] In some embodiments, the ammonia recovery equipment further includes a connecting chamber located below the discharge chamber, and multiple discharge chambers are connected to the connecting chamber. The transport component passes through the connecting chamber, and the downstream opening of the connecting chamber forms the discharge port.

[0020] The second aspect of this utility model also proposes a denitrification system.

[0021] A denitrification system according to a second aspect of the present invention includes a denitrification reactor and an ammonia recovery device according to any one of the first aspects of the present invention. The flue gas inlet of the denitrification reactor is connected to the desorption outlet of the ammonia desorption tower, and the high-temperature flue gas outlet of the denitrification reactor is connected to the inlet of the first heat exchange flow path of the heat exchanger.

[0022] According to the denitrification system of the second aspect of this utility model, the flue gas inlet of the denitrification reactor is connected to the desorption outlet of the ammonia desorption tower. This means that the ammonia gas desorbed by the ammonia desorption tower can be reintroduced into the denitrification reactor to participate in the reduction process of nitrogen oxides, thus achieving full utilization of the material and reducing the amount of ammonia gas released into the external environment. The high-temperature flue gas outlet of the denitrification reactor is connected to the inlet of the first heat exchange path of the heat exchanger, so that the heat from the high-temperature flue gas can be used to heat the gas in the second heat exchange path, ultimately for the desorption of ammonia gas from the ammonia adsorbent in the ammonia desorption tower.

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

[0024] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0026] Figure 1 This is a schematic diagram of the denitrification system according to an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of an ammonia adsorption tower or ammonia desorption tower according to an embodiment of the present invention.

[0028] Figure label:

[0029] Ammonia recovery equipment 100;

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

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

[0032] Heat exchanger 30;

[0033] Denitrification reactor 40; High-temperature flue gas outlet 401; Flue gas inlet 402;

[0034] Tower body 50;

[0035] 501; 502; 503; 504;

[0036] baffle 505; opening 506;

[0037] Component 60;

[0038] 601 housing; 602 inlet; 603 outlet; 604 receiving cavity;

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

[0040] Denitrification system 200. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0042] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order or hierarchy.

[0043] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "attachment," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] In this invention, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0045] In the embodiments of this utility model, the same reference numerals 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 this utility model shown in the drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this utility model.

[0046] In this utility model, "multiple" refers to two or more (including two).

[0047] The following is combined Figure 1 and Figure 2 This invention describes the ammonia recovery device 100 and the denitrification system 200 of this utility model.

[0048] The ammonia recovery device 100 according to the first aspect of this utility model is used in a denitrification reactor 40. The denitrification reactor 40 in this application embodiment can be a denitrification reactor 40 employing selective non-catalytic reduction (SNCR) technology or a denitrification reactor 40 employing selective catalytic reduction (SCR) technology. The reducing agent used in the denitrification reactor 40 is not specifically limited here; as long as the denitrification reactor 40 contains ammonia in its outlet flue gas, the ammonia recovery device 100 in this application embodiment can be used to recover the ammonia.

[0049] like Figure 1 As shown, the ammonia recovery device 100 according to the first aspect of the present invention includes 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 using an ammonia adsorbent; the ammonia desorption tower 20 is used to remove ammonia from the ammonia adsorbent; that is, the ammonia adsorbent can adsorb ammonia and can also desorb ammonia under certain conditions.

[0050] The heat exchanger 30 includes a first heat exchange flow path and a second heat exchange flow path. The first heat exchange flow path is used to connect the high-temperature flue gas outlet 401 of the denitrification reactor 40 and the adsorption 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 desorption inlet 201 of the ammonia desorption tower 20 is connected to the outlet of the second heat exchange flow path to remove ammonia 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 using an ammonia adsorbent. That is, the ammonia adsorption tower 10 stores an ammonia adsorbent for adsorbing ammonia gas. Flue gas containing ammonia enters the ammonia adsorption tower 10 through the adsorption inlet 101 and is adsorbed by the ammonia adsorbent. The flue gas after ammonia removal is discharged from the ammonia adsorption tower 10 through the adsorption outlet 102, for example, to the external environment. By setting up the ammonia adsorption tower 10 to adsorb ammonia in the flue gas discharged from the denitrification reactor 40, unreacted ammonia gas is recovered, reducing the direct discharge of flue gas and preventing secondary pollution from ammonia in the flue gas.

[0052] The ammonia desorption tower 20 is used to remove ammonia from the ammonia adsorbent. It is understood that the ammonia adsorbent in the ammonia desorption tower 20 is an ammonia adsorbent that has already absorbed ammonia, such as an ammonia adsorbent that has reached saturation. By removing the ammonia from the ammonia adsorbent in the ammonia desorption tower 20, the removed ammonia can be reused, and the ammonia adsorbent can also be reused to adsorb ammonia, thereby reducing the generation of production waste and achieving full utilization and recycling of production raw materials, which is environmentally friendly.

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

[0054] As described above, by setting up heat exchanger 30, on the one hand, heat exchanger 30 can cool down the high-temperature flue gas discharged from denitrification reactor 40. The cooled flue gas then enters ammonia adsorption tower 10 for ammonia adsorption, which helps to improve the ammonia adsorption rate of ammonia adsorption tower 10. On the other hand, air or other gases can be introduced into the inlet of the second heat exchange flow path. The heat from the high-temperature flue gas discharged from denitrification reactor 40 is used to heat the gas introduced into the second heat exchange flow path to form a high-temperature gas that is discharged. The discharged high-temperature gas enters ammonia desorption tower 20 to remove ammonia from the ammonia adsorbent in ammonia desorption tower 20. Thus, the heat from the high-temperature flue gas discharged from denitrification reactor 40 is recovered and utilized, making full and rational use of energy, improving energy utilization efficiency, and helping to reduce production costs.

[0055] According to the ammonia recovery equipment 100 of this utility model embodiment, by setting up an ammonia adsorption tower 10 to adsorb ammonia with an ammonia adsorbent, the ammonia that has not participated in the reaction in the high-temperature flue gas discharged from the denitrification reactor 40 is recovered, reducing the direct discharge of flue gas and preventing secondary pollution of the environment caused by ammonia in the flue gas; by setting up a heat exchanger 30, the heat exchanger 30 uses the heat of the high-temperature flue gas from the denitrification reactor 40 to heat the gas into a high-temperature gas and pass it into the ammonia desorption tower 20 for ammonia removal. Thus, the heat of the high-temperature flue gas discharged from the denitrification reactor 40 and the recovery of ammonia are realized, making full and rational use of energy and materials, improving the utilization rate of energy and materials, and helping to reduce production costs.

[0056] In some embodiments, reference may be made to Figure 2 Both the ammonia adsorption tower 10 and the ammonia desorption tower 20 include a tower body 50 and at least one cooperating component 60. The tower body 50 forms a receiving space 501 and an outlet 502. The outlet 502 is connected to the receiving space 501 and the inlet 503. The cooperating component 60 is disposed in the receiving space 501. The cooperating component 60 includes a shell 601. The shell 601 has a receiving cavity 604 for receiving ammonia adsorbent. The side wall of the shell 601 forms a connecting hole. The shell 601 divides the receiving space 501 into multiple subspaces 504. The receiving cavity 604 is connected to two adjacent subspaces 504 through the connecting hole.

[0057] You can refer to Figure 2 , Figure 2 The direction indicated by the middle arrow is the gas flow direction. That is, during the operation of the ammonia desorption tower 20 and the ammonia adsorption tower 10, gas enters the containing space 501 from the inlet 503, and then enters the containing cavity 604 from the containing space 501, where it contacts the ammonia adsorbent to undergo ammonia adsorption or desorption. After passing through multiple sub-spaces 504 and multiple containing cavities 604, the gas is discharged through the outlet 502. The containing cavity 604 connects adjacent sub-spaces 504 through connecting holes; that is, adjacent sub-spaces 504 are only connected to each other through connecting holes on the shell 601, and are not directly connected, to prevent flue gas from being discharged directly from the outlet 502 without passing through the mating assembly 60. Specifically, the shell 601 has multiple connecting holes on both sides along the gas flow direction, which helps to increase the gas flow area.

[0058] It should be noted that there are multiple embodiments for the mating component 60. Depending on actual needs, some mating components 60 may include an ammonia adsorbent, while others may not. It is understood that the inner diameter of the connecting hole needs to be smaller than the diameter of the ammonia adsorbent particles to reduce the possibility of ammonia adsorbent leakage from the connecting hole.

[0059] In the above embodiments, by providing multiple coordinating components 60 in the accommodating space 501, the gas can pass through multiple coordinating components 60 before being discharged, which is beneficial to increasing the number and frequency of contact between the gas and the ammonia adsorbent, thus facilitating the full adsorption and desorption of ammonia.

[0060] In some embodiments, reference may be made to Figure 2 The accommodating space 501 is provided with a plurality of baffles 505 spaced apart along a set direction. The edges of the baffles 505 are connected to the inner wall of the accommodating space 501. The mating component 60 passes through the plurality of baffles 505 and the outer peripheral surface of the housing 601 is connected to the baffles 505. The baffles 505 have openings 506. The openings 506 of adjacent baffles 505 are respectively located on both sides of the mating 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 opening 506 of the adjacent baffle 505 are respectively located on both sides of the mating component 60 perpendicular to the set direction. The air outlet 502 and the opening 506 of the adjacent baffle 505 are respectively located on both sides of the mating component 60 perpendicular to the set direction.

[0061] Specifically, there may be one mating component 60, or there may be multiple mating components 60. The opening 506 may be formed by the baffle 505 itself, or the opening 506 may be defined by the baffle 505 and the inner wall of the receiving space 501; or the opening 506 may be defined by the baffle 505, the inner wall of the receiving space 501 and the outer peripheral surface of the housing 601.

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

[0063] The openings 506 of adjacent baffles 505 are located on both sides of the cooperating assembly 60 perpendicular to the set direction. In the set direction, the inlet 503 and outlet 502 are located on both sides of multiple baffles 505. The inlet 503 and the openings 506 of adjacent baffles 505 are located on both sides of the cooperating assembly 60 perpendicular to the set direction, and the outlet 502 and the openings 506 of adjacent baffles 505 are located on both sides of the cooperating assembly 60 perpendicular to the set direction. This allows the gas to flow along a long path within the containing space 501, maximizing contact with the ammonia adsorbent over a large area for a long time, ensuring that all the ammonia adsorbent is fully in contact with the gas. This results in more complete adsorption or desorption of ammonia, improving the ammonia adsorption or desorption rate and increasing the utilization rate of the ammonia adsorbent. The phrase "located on both sides of the cooperating assembly 60 perpendicular to the set direction" refers to the two sides of the entire cooperating assembly 60 within the tower body 50 perpendicular to the set direction.

[0064] In some embodiments, reference may be made to Figure 2 The upper end of the shell 601 has a feed inlet 602 and the lower end of the shell 601 has a discharge outlet 603. The feed inlet 602 and the discharge outlet 603 are connected to the receiving cavity 604 so that ammonia adsorbent can be added to the receiving cavity 604 through the feed inlet 602 and the ammonia adsorbent can be discharged from the receiving cavity 604 through the discharge outlet 603.

[0065] For example, in ammonia adsorption tower 10, after the ammonia adsorbent in the coordinating component 60 has adsorbed ammonia to a certain extent, the saturated ammonia adsorbent can be discharged from the outlet 603, and ammonia adsorbent that has not adsorbed ammonia or has a low adsorption capacity can be added from the inlet 602. Similarly, in ammonia desorption tower 20, after the ammonia adsorbent in the coordinating component 60 has desorbed ammonia to a certain extent, the desorbed ammonia adsorbent can be discharged from the outlet 603, and ammonia adsorbent that has adsorbed ammonia or has a high adsorption capacity can be added from the inlet 602.

[0066] For example, a first control valve may be provided at or near the inlet 602, and a second control valve may be provided at or near 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 receiving cavity 604 or to discharge the ammonia adsorbent from the receiving cavity 604, the inlet 602 and the outlet 603 may 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 may be made to Figure 2 As shown, the mating assembly 60 includes a plurality of partitions 605, which are arranged at intervals in the vertical direction to divide the receiving cavity 604 into a plurality of sub-cavities 606. The partitions 605 are movable to connect or separate adjacent sub-cavities 606.

[0068] By setting multiple baffles 605, the flue gas is not easily able to flow directly up and down due to the obstruction effect of the baffles 605, but rather flows in a more circuitous manner, thereby prolonging the contact time and contact area between the flue gas and the ammonia adsorbent. When the ammonia adsorption tower 10 or the ammonia desorption tower 20 has been running for a period of time, or when the ammonia concentration at the opening 506 closest to the inlet 503 does not change much compared to the ammonia concentration at the inlet 503, the outlet 603 can be opened, allowing the ammonia adsorbent below the lowest baffle 605 to be discharged from the outlet 603. Then, the multiple baffles 605 above the outlet 603 are opened in sequence, allowing the ammonia adsorbent to fill the sub-cavities 606 below the baffles 605 in sequence, thereby achieving the replacement of the ammonia adsorbent. This cycle is repeated to achieve the flow-type replacement of the ammonia adsorbent, realizing the replacement of the adsorbent and the adjustment of efficiency without the need for shutdown.

[0069] For example, the partition 605 can be pulled out to translate along a direction perpendicular to a set direction, thereby enabling switching between connecting adjacent sub-cavities 606 and separating adjacent sub-cavities 606.

[0070] In some embodiments, baffles 505 and partitions 605 can be arranged in a one-to-one correspondence. That is, partitions 605 do not occupy the gas flow area between baffles 505, and at the same time, they can prevent flue gas from directly reaching both sides of baffles 505 along the mating component 60, thus shortening the flow path of the flue gas.

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

[0072] Here, the ammonia concentration detector is located at the opening 506 adjacent to the air inlet 503, either directly at the opening 506 or directly on both sides of the opening 506, i.e., close to the opening 506.

[0073] For example, in the ammonia adsorption tower 10, when the flue gas enters from the inlet 503 and flows to the opening 506, and the concentration at the opening 506 reaches 70% to 100% of the concentration at the inlet 503, the outlet 603 can be opened, and the multi-layer baffle 605 above the outlet 603 can be opened sequentially from bottom to top, as well as the inlet 602. This allows the saturated ammonia adsorbent to be discharged from the outlet 603, the ammonia adsorbent above the baffle 605 to fall below the baffle 605, and the ammonia adsorbent at the inlet 602 to fall into the sub-cavity 606 below the inlet 602, thereby achieving automatic replacement of the ammonia adsorbent in the ammonia adsorption tower without stopping the machine.

[0074] For example, in the ammonia desorption tower 20, when the flue gas enters from the inlet 503 and flows to the opening 506, the concentration at the opening 506 is low and close to 0, and the reading does not change significantly. At this time, the outlet 603 can be opened, the multi-layer baffle 605 above the outlet 603 can be opened sequentially from bottom to top, and the inlet 602 can be opened. This allows the desorbed ammonia adsorbent to be discharged from the outlet 603, the ammonia adsorbent above the baffle 605 to fall below the baffle 605, and the ammonia adsorbent at the inlet 602 to fall into the sub-cavity 606 below the inlet 602, thereby realizing the automatic replacement of the ammonia adsorbent in the ammonia desorption tower without stopping the machine.

[0075] By setting up an ammonia concentration detector, it is easy to determine whether the ammonia adsorbent is saturated or desorbed, which helps to make full use of the ammonia adsorbent or to improve the adsorption capacity of the ammonia adsorbent after desorbing ammonia.

[0076] In some embodiments, the ammonia adsorbent in this application can be a solid adsorbent particle, which reduces the corrosiveness to equipment and the environment, improves safety, facilitates the desorption process of ammonia and the ammonia adsorbent, and makes it easier to recover and reuse ammonia.

[0077] In some embodiments, 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 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.

[0078] It should be noted that the feed port can be formed by the feed inlets 602 of one or more components 60, or the feed port of the ammonia adsorption tower 10 or the ammonia desorption tower 20 can also be a single feed port, which is connected to the feed inlets 602 of one or more components 60. The discharge port can be formed by the discharge ports 603 of one or more components 60, or the discharge port of the ammonia adsorption tower 10 or the ammonia desorption tower 20 can also be a single discharge port, which is connected to the discharge ports 603 of one or more components 60.

[0079] In some embodiments, the ammonia recovery device 100 further includes a transport component for transporting the ammonia adsorbent from the discharge port of the ammonia adsorption tower 10 to the feed port of the ammonia desorption tower 20 and for transporting the ammonia adsorbent from the discharge port of the ammonia desorption tower 20 to the feed port of the ammonia adsorption tower 10.

[0080] Specifically, the transport component can transport the ammonia adsorbent from the discharge port to the feed port, or it can transport the ammonia adsorbent from a position near the discharge port to a position near the feed port. For example, the transport component can be an open or partially enclosed conveyor belt, a spiral conveyor pipe, or a combination of both.

[0081] By setting up a transport component, the ammonia adsorbent can be transferred back and forth between the ammonia adsorption tower 10 and the ammonia desorption tower 20, so as to realize the fluidized recycling of the ammonia adsorbent.

[0082] In some embodiments, reference may be made to Figure 2 Both the ammonia adsorption tower 10 and the ammonia desorption tower 20 include multiple assembly components 60 for containing ammonia adsorbent. Both the ammonia adsorption tower 10 and the ammonia desorption tower 20 include a feed bin 701 and a discharge bin 702. The feed bin 701 is connected to the feed port 602 of the assembly component 60, and the discharge bin 702 is connected to the discharge port 603 of the assembly component 60.

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

[0084] For example, the connecting port on one side of the discharge hopper 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 hopper 702 can be smaller than the cross-sectional area of ​​the connecting port on one side of the discharge hopper 702, so that the ammonia adsorbent falls into the transport component as much as possible and reduces the possibility of the ammonia adsorbent scattering outside the transport component.

[0085] For example, the connection port on one side of the feed hopper 701 is used to connect to the feed port 602 of the mating component 60, and the cross-sectional area of ​​the connection port on the other side of the feed hopper 701 can be larger than the cross-sectional area of ​​the connection port on one side of the feed hopper 701, so that the ammonia adsorbent falls into the feed hopper 701 as much as possible and reduces the possibility of the ammonia adsorbent scattering outside the feed hopper 701.

[0086] In some embodiments, both the ammonia adsorption tower 10 and the ammonia desorption tower 20 include connecting pipes located above the feed hopper 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 to multiple feed hoppers 701 in a corresponding manner. The discharge 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] Multiple feed hoppers 701 are connected by connecting pipes. The transport component is located above the feeding port. Ammonia adsorbent falling from the discharge end of the transport component falls into the feeding port, then enters the feed hopper 701 through the main pipe and multiple branch pipes, and finally enters the feed port 602 of the cooperating component 60, thus realizing the feeding process of the cooperating component 60. By setting up connecting pipes, automatic feeding of multiple cooperating components 60 can be realized, reducing the possibility of ammonia adsorbent falling into 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 chamber 703, which is located below the discharge chamber 702. Multiple discharge chambers 702 are connected to the connecting chamber 703. The transport component passes through the connecting chamber 703, and the downstream opening of the connecting chamber 703 forms a discharge port.

[0089] During operation, the transport component passes through the connecting chamber 703. Ammonia adsorbent discharged from the outlet 603 of the cooperating component 60 enters the connecting chamber 703 from the outlet 702, falls onto the transport component within the connecting chamber 703, and is then transported out from the discharge port by the transport component. By setting up the connecting chamber 703, the impact of wind and other factors on the falling material can be reduced. Even if a small amount of ammonia adsorbent falls outside the transport component, it will fall into the connecting chamber 703, thereby reducing the possibility of ammonia adsorbent entering the environment and facilitating subsequent cleaning and collection of the ammonia adsorbent.

[0090] In other embodiments, the transport component may not be located in the connecting chamber 703. The ammonia adsorbent in the connecting chamber 703 is moved by the driving force of external materials, 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 connecting chamber 703.

[0091] The second aspect of this utility model also proposes a denitrification system 200.

[0092] You can refer to Figure 1 The denitrification system 200 according to a second aspect embodiment of the present invention includes a denitrification reactor 40 and an ammonia recovery device 100 according to any embodiment of the first aspect of the present invention. The flue gas inlet 402 of the denitrification reactor 40 is connected to the desorption outlet 202 of the ammonia desorption tower 20, and the high-temperature flue gas outlet 401 of the denitrification reactor 40 is connected to the inlet of the first heat exchange flow path of the heat exchanger 30.

[0093] According to the denitrification system 200 of the second aspect of this utility model, the flue gas inlet 402 of the denitrification reactor 40 is connected to the desorption outlet 202 of the ammonia desorption tower 20. This means that the ammonia gas desorbed by the ammonia desorption tower 20 can be reintroduced into the denitrification reactor 40 to participate in the reduction process of nitrogen oxides, thus achieving full utilization of the material and reducing the amount of ammonia gas released into the external environment. The high-temperature flue gas outlet 401 of the denitrification reactor 40 is connected to the inlet of the first heat exchange 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 path, ultimately for the desorption of ammonia gas from the ammonia adsorbent in the ammonia desorption tower 20.

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

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

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

[0097] In other embodiments, an ammonia concentration detector located near the opening 506 of the adsorption inlet 101 of the ammonia adsorption tower 10 can be used to detect if the ammonia adsorbent reaches saturation too quickly. This can also indicate excessive use of the reducing agent in the denitrification reactor 40. In this case, the amount of reducing agent added to the denitrification reactor 40 can be reduced.

[0098] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present 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, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

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

Claims

1. An ammonia recovery device, characterized in that, For use in denitrification reactor (40), including: Ammonia adsorption tower (10), wherein the ammonia adsorption tower (10) is used to adsorb ammonia gas using an ammonia adsorbent; Ammonia desorption tower (20), wherein the ammonia desorption tower (20) is used to remove ammonia gas from the ammonia adsorbent; The heat exchanger (30) includes a first heat exchange flow path and a second heat exchange flow path. The first heat exchange flow path is used to connect the high-temperature flue gas outlet (401) of the denitrification reactor (40) and the adsorption 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 desorption inlet (201) of the ammonia desorption tower (20) is connected to the outlet of the second heat exchange flow path to remove ammonia using the high-temperature gas discharged from the second heat exchange flow path.

2. The ammonia recovery equipment according to claim 1, characterized in that, Both the ammonia adsorption tower (10) and the ammonia desorption tower (20) include a tower body (50) and at least one matching component (60). The tower body (50) forms a receiving space (501), an outlet (502), and an inlet (503). The outlet (502) is connected to the receiving space (501) and the inlet (503). The inlet (503) of the tower body (50) of the ammonia adsorption tower (10) is formed as the adsorption inlet (101), and the inlet (503) of the tower body (50) of the ammonia desorption tower (20) is formed as the desorption inlet (201). The fitting component (60) is disposed in the receiving space (501). The fitting component (60) includes a housing (601) having a receiving cavity (604) for receiving the ammonia adsorbent. A connecting hole is formed on the side wall of the housing (601). The housing (601) divides the receiving space (501) into a plurality of subspaces (504). The receiving cavity (604) connects two adjacent subspaces (504) through the connecting hole.

3. The ammonia recovery equipment according to claim 2, characterized in that, The accommodating space (501) is provided with a plurality of baffles (505) spaced apart along a set direction. The edges of the baffles (505) are connected to the inner wall of the accommodating space (501). The mating component (60) passes through the plurality of baffles (505) and the outer peripheral surface of the housing (601) is connected to the baffles (505). The baffle (505) has an opening (506), and the openings (506) of adjacent baffles (505) are respectively located on both sides of the mating assembly (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 opening (506) of the adjacent baffle (505) are respectively located on both sides of the mating assembly (60) perpendicular to the set direction, and the air outlet (502) and the opening (506) of the adjacent baffle (505) are respectively located on both sides of the mating assembly (60) perpendicular to the set direction.

4. The ammonia recovery equipment according to claim 3, characterized in that, The upper end of the housing (601) has a feed inlet (602), and the lower end of the housing (601) has a discharge outlet (603). The feed inlet (602) and the discharge outlet (603) are connected to the receiving cavity (604). The mating assembly (60) includes a plurality of partitions (605). The plurality of partitions (605) are arranged at intervals in the vertical direction to divide the receiving 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). The partition (605) is configured to connect or separate the 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 1-5, 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 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 for transporting the ammonia adsorbent from the discharge port of the ammonia adsorption tower (10) to the feed port of the ammonia desorption tower (20) and for transporting 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, Both the ammonia adsorption tower (10) and the ammonia desorption tower (20) include multiple coordinating components (60) for containing ammonia adsorbent. Both the ammonia adsorption tower (10) and the ammonia desorption tower (20) include a feed bin (701) and a discharge bin (702). The feed bin (701) is connected to the feed inlet (602) of the coordinating component (60), and the discharge bin (702) is connected to the discharge outlet (603) of the coordinating component (60). The transport assembly is located below the discharge hopper (702) so that the ammonia adsorbent falls from the discharge hopper (702) onto the transport assembly; A connecting pipe is located above the feed hopper (701). The connecting pipe includes a main pipe and branch pipes. One end of the main pipe is connected to a plurality of branch pipes, and the plurality of branch pipes are connected to a plurality of feed hoppers (701) in a one-to-one correspondence. The discharge end of the transport component is located above the other end of the main pipe, and the other end of the main pipe forms the feeding port.

8. The ammonia recovery equipment according to claim 7, characterized in that, It also includes a connecting compartment (703), which is located below the discharge compartment (702), and multiple discharge compartments (702) are connected to the connecting compartment (703). The transport component passes through the connecting compartment (703), and the downstream opening (506) of the connecting compartment (703) forms the discharge port.

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

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

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