CN219630974U

CN219630974U - Ammonia recovery system

Info

Publication number: CN219630974U
Application number: CN202223606432.6U
Authority: CN
Inventors: 赵新胜; 张大伟; 周凯; 陈小虎
Original assignee: Shanxi Huaxin Fertilizer Corp
Current assignee: Shanxi Huaxin Fertilizer Corp
Priority date: 2022-12-30
Filing date: 2022-12-30
Publication date: 2023-09-05
Anticipated expiration: 2032-12-30

Abstract

The utility model relates to the technical field of synthetic ammonia, and discloses an ammonia recovery system, which comprises an ammonia washing tower, wherein the ammonia washing tower comprises: the immersion section is provided with an air inlet, the immersion section can be filled with a first absorption liquid, and gas to be treated can enter the first absorption liquid through the air inlet; the spraying section is arranged above the immersing section and communicated with the immersing section, the spraying section is provided with a spraying element and two sections of packing layers, the spraying element is arranged above the two sections of packing layers, and the spraying element can spray the second absorption liquid towards the two sections of packing layers; the bubble cap column plate section is arranged above the spraying section and communicated with the spraying section, the bubble cap column plate section flows with a third absorption liquid, and the top of the bubble cap column plate section is provided with an exhaust port; the first absorption liquid, the second absorption liquid and the third absorption liquid can absorb ammonia in the gas to be treated. The ammonia recovery system provided by the embodiment of the disclosure can efficiently recover ammonia in purge gas.

Description

Ammonia recovery system

Technical Field

The utility model relates to the technical field of synthetic ammonia, for example to an ammonia recovery system.

Background

Synthetic ammonia generally refers to ammonia gas directly synthesized from nitrogen and hydrogen at high temperature and high pressure under the action of a catalyst. Purge gas having a certain amount of ammonia gas is generated during the synthesis of ammonia.

The related art provides an ammonia recovery system that adopts the atmospheric filler tower to retrieve the ammonia in the synthetic ammonia purge gas.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

the ammonia recovery system provided in the related art has the advantages that the recovery rate of ammonia in the purge gas is low, the concentration of prepared ammonia is low, sales are difficult, the content of ammonia in the treated purge gas is high, when the ammonia recovery system is used as fuel gas, the ammonia recovery system has low heat value and unexpected side reactions caused by high ammonia content, flameout events occur for a plurality of times, meanwhile, the high ammonia content can aggravate the corrosion of a pipeline, potential safety hazards are caused, and great environmental pollution and resource waste are caused.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.

The embodiment of the disclosure provides an ammonia recovery system, which can efficiently recover ammonia in purge gas.

In some embodiments, the ammonia recovery system comprises an ammonia wash column comprising: the immersion section is provided with an air inlet, the immersion section can be filled with a first absorption liquid, and gas to be treated can enter the first absorption liquid through the air inlet; the spraying section is arranged above the immersing section and is communicated with the immersing section, a spraying element and two sections of packing layers are arranged at the top of the spraying section, the spraying element is arranged above the two sections of packing layers, and the spraying element can spray the second absorption liquid towards the two sections of packing layers; the bubble cap column plate section is arranged above the spraying section and is communicated with the spraying section, the bubble cap column plate section flows with a third absorption liquid, and the top of the bubble cap column plate section is provided with an exhaust port; wherein the first absorption liquid, the second absorption liquid and the third absorption liquid can absorb ammonia in the gas to be treated.

In some embodiments, the ammonia recovery system further comprises: the liquid transmission component is connected with the immersion section at one end and the spraying element at the other end, and can absorb the first absorption liquid from the immersion section and convey the absorbed first absorption liquid to the spraying element; the first part of the first absorption liquid is conveyed to the spraying element by the liquid conveying component, and the first part of the first absorption liquid is the second absorption liquid.

In some embodiments, the bottom of the immersion section is provided with a liquid outlet, and the liquid transfer assembly comprises: a communicating pipe for communicating the liquid outlet and the spray member; and one or more pump bodies provided to the communication pipe, the pump bodies being connected in parallel in the case where the liquid transfer assembly includes a plurality of pump bodies.

In some embodiments, the air inlet is provided at a lower portion of the immersion section side wall and/or the air inlet is provided at a bottom of the immersion section.

In some embodiments, the ammonia recovery system further comprises: and the cooling water circulation assembly is used for cooling the first absorption liquid in the immersed section.

In some embodiments, the cooling water circulation assembly includes: the cooling coil is arranged in the immersion section, and a cooling liquid inlet and a cooling liquid outlet are formed on the side wall of the immersion section; the low-temperature cooling liquid can enter the cooling coil pipe through the cooling liquid inlet, exchange heat with the first absorption liquid in the immersed section in the cooling coil pipe, and flow out of the cooling coil pipe through the cooling liquid outlet.

In some embodiments, the lower part of the spraying element is provided with a filler, the second absorption liquid sprayed by the spraying element passes through the filler from top to bottom, and the gas to be treated passes through the filler from bottom to top.

In some embodiments, the ammonia recovery system further comprises: a liquid discharge assembly in communication with the liquid outlet for discharging a second portion of the first absorption liquid; wherein the first portion of the first absorption liquid is greater than the second portion of the first absorption liquid.

In some embodiments, the ammonia recovery system further comprises: an exhaust pipe communicated with the exhaust port; the control valve is arranged on the exhaust pipe; the pressure sensor is used for acquiring target pressure, and the target pressure is the pressure of the gas to be treated in the ammonia washing tower; the target pressure can be adjusted by adjusting the opening degree of the control valve.

In some embodiments, the target pressure is adjustable in the range of 1.6 (G) MPa to 1.8 (G) MPa.

In some embodiments, the first absorption liquid is water; and/or, the third absorption liquid is desalted water.

The ammonia recovery system provided by the embodiment of the disclosure can realize the following technical effects:

the ammonia recovery system provided by the embodiment of the disclosure comprises an ammonia washing tower, wherein the ammonia washing tower comprises an immersion section, a spraying section and a bubble cap column plate section which are sequentially arranged from bottom to top. The immersion section can be filled with a first absorption liquid, and the gas to be treated can enter the first absorption liquid through the air inlet of the immersion section for first absorption. The gas to be treated after the first absorption enters the spraying section from bottom to top, and is fully contacted with the second absorption liquid sprayed downwards by the spraying section to be absorbed for the second time. And the gas to be treated after the second absorption enters a bubble cap column plate section and fully contacts with third absorption liquid flowing in the bubble cap column plate section to be absorbed for the third time. The ammonia content in the gas to be treated after three times of absorption is greatly reduced, so that the ammonia recovery system provided by the embodiment of the disclosure can efficiently recycle the ammonia in the purge gas, greatly improve the concentration of produced ammonia and simultaneously reduce the potential safety hazard caused by overhigh ammonia content.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the utility model.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:

fig. 1 is a schematic structural diagram of an ammonia recovery system according to an embodiment of the present disclosure.

Reference numerals:

11. an immersion section; 12. a spraying section; 13. a bubble cap tray section; 2. a cooling water circulation assembly; 3. a liquid transfer assembly; 4. a pump body; 5. a liquid discharge assembly; and 6, a pressure sensor.

Detailed Description

So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.

The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are used primarily to better describe embodiments of the present disclosure and embodiments thereof and are not intended to limit the indicated device, element, or component to a particular orientation or to be constructed and operated in a particular orientation. Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the embodiments of the present disclosure will be understood by those of ordinary skill in the art in view of the specific circumstances.

In addition, the terms "disposed," "connected," "secured" and "affixed" are to be construed broadly. For example, "connected" may be in a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the embodiments of the present disclosure may be understood by those of ordinary skill in the art according to specific circumstances.

The term "plurality" means two or more, unless otherwise indicated.

In the embodiment of the present disclosure, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.

It should be noted that, without conflict, the embodiments of the present disclosure and features of the embodiments may be combined with each other.

The embodiment of the disclosure provides an ammonia recovery system, which can efficiently recover ammonia in purge gas, greatly improve the concentration of produced ammonia water and reduce potential safety hazards caused by overhigh ammonia content.

The ammonia recovery system comprises an ammonia wash tower comprising an immersion section 11, a spray section 12 and a bubble cap tray section 13.

The immersion section 11 is provided with an air inlet through which the immersion section 11 can be filled with a first absorption liquid into which the gas to be treated can enter. The spray section 12 is arranged above the immersion section 11 and is communicated with the immersion section 11, the spray section 12 is provided with a spray element and two sections of packing layers, the spray element is arranged above the two sections of packing layers and can spray the second absorption liquid towards the two sections of packing layers. The bubble-cap column plate section 13 is arranged above the spraying section 12 and is communicated with the spraying section 12, the bubble-cap column plate section 13 is provided with a third absorption liquid in a flowing mode, and the top of the bubble-cap column plate section 13 is provided with an exhaust port. The first absorption liquid, the second absorption liquid and the third absorption liquid can absorb ammonia in the gas to be treated.

The ammonia recovery system provided by the embodiment of the disclosure comprises an ammonia washing tower, wherein the ammonia washing tower comprises an immersion section 11, a spraying section 12 and a bubble cap tray section 13 which are sequentially arranged from bottom to top. The immersion section 11 can be filled with a first absorption liquid, and the gas to be treated can enter the first absorption liquid through the gas inlet of the immersion section 11 for first absorption. The gas to be treated after the first absorption enters the spraying section 12 from bottom to top, and is fully contacted with the second absorption liquid sprayed downwards by the spraying section to carry out the second absorption. The gas to be treated after the second absorption enters the bubble-cap column plate section 13 and fully contacts with the third absorption liquid flowing in the bubble-cap column plate section 13 to be absorbed for the third time. The ammonia content in the gas to be treated after three times of absorption is greatly reduced, so that the ammonia recovery system provided by the embodiment of the disclosure can efficiently recover the ammonia in the purge gas, and realize ultralow emission; the absorption efficiency is improved, the concentration of ammonia water is greatly improved, and the environmental protection performance and the economic performance are improved; meanwhile, the quality of fuel gas is improved, and potential safety hazards caused by too high ammonia content are reduced.

The ammonia recovery system provided by the embodiment of the disclosure comprises an ammonia washing tower. The ammonia washing tower is one of the main equipment for recovering ammonia by water ammonia washing, and the recovery principle is that the gas to be treated enters from the lower part of the cooling section and is discharged from the top of the ammonia washing section, and in the ammonia washing tower, the absorption liquid contacts with the gas to be treated and absorbs the ammonia in a gas-liquid mass transfer mode.

The ammonia wash column comprises an immersion section 11, a spray section 12 and a bubble cap tray section 13.

The immersion section 11 is provided with an air inlet through which the immersion section 11 can be filled with a first absorption liquid into which the gas to be treated can enter. The gas to be treated enters the first absorption liquid of the immersion section 11 through the gas inlet and is fully contacted with the first absorption liquid, and the first absorption liquid can absorb ammonia in the gas to be treated so as to primarily recover the ammonia in the gas to be treated.

Optionally, an air inlet is provided in the lower part of the side wall of the immersion section 11 and/or an air inlet is provided in the bottom of the immersion section 11. That is, the air inlet is provided at the lower portion of the sidewall of the immersed section 11, or the air inlet is provided at the bottom of the immersed section 11, or the air inlet is provided at the lower portion of the sidewall of the immersed section 11 and the bottom of the immersed section 11.

Because the density of the gas to be treated is low, the gas inlet is arranged at the lower part of the side wall of the immersed section 11 and/or at the bottom of the immersed section 11, so that the gas to be treated passes through the immersed section 11 from bottom to top and is fully contacted with the first absorption liquid.

Optionally, the first absorption liquid is water. Because ammonia is very soluble in water, the ammonia in the gas to be treated can be absorbed by water, and ammonia water is generated.

Optionally, the ammonia gas recovery system further comprises a cooling water circulation assembly 2, the cooling water circulation assembly 2 being adapted to cool the first absorption liquid in the immersion section. The lower the temperature is, the greater the solubility of ammonia gas in water is, and by providing the cooling water circulation module 2 to lower the temperature of the first absorption liquid in the immersion section 11, the absorption amount of the first absorption liquid to ammonia gas can be improved.

Alternatively, the circulation medium inside the cooling water circulation assembly 2 is synthetic low-temperature chilled water.

Optionally, the cooling water circulation assembly 2 comprises a cooling coil arranged inside the immersed section 11, the cooling coil forming a cooling liquid inlet and a cooling liquid outlet at the side wall of the immersed section 11; wherein the cryogenic cooling fluid is able to enter the cooling coil through the cooling fluid inlet, exchange heat within the cooling coil with the first absorption fluid within the immersion section 11, and exit the cooling coil through the cooling fluid outlet.

It will be appreciated that when the cryogenic coolant exits the coolant outlet, it is cooled again and circulated through the coolant inlet and into the cooling coil.

The spray section 12 is arranged above the immersion section 11 and is communicated with the immersion section 11, a spray element is arranged at the top of the spray section 12, two sections of packing layers are arranged below the spray element, and the spray element can spray the second absorption liquid towards the two sections of packing layers.

The gas to be treated which is primarily absorbed by the immersion section 11 enters the spraying section 12, and passes through the two sections of filler layers from bottom to top, and the sprayed second absorption liquid passes through the two sections of filler layers from top to bottom, fully contacts with the gas to be treated, and secondarily absorbs ammonia in the gas to be treated.

Optionally, the ammonia gas recovery system provided by the embodiments of the present disclosure further comprises a liquid transfer assembly 3. One end of the liquid transfer assembly 3 is connected with the immersion section 11, and the other end is connected with the spray element, and the liquid transfer assembly 3 is capable of sucking the first absorption liquid from the immersion section 11 and delivering the sucked first absorption liquid to the spray element. Wherein, the first part of the first absorption liquid is transported to the spraying element by the liquid transporting component 3, and the first part of the first absorption liquid is the second absorption liquid.

By the arrangement, ammonia in the gas to be treated can be absorbed again by the second absorption liquid, the ammonia content in the gas to be treated is reduced, and the concentration of ammonia in the second absorption liquid is increased. The second absorption liquid is a first part of the first absorption liquid, and the first absorption liquid becomes ammonia water after absorbing ammonia gas, that is, the second absorption liquid is ammonia water.

Optionally, a liquid outlet is provided at the bottom of the immersion section 11, from which the first absorption liquid exits the immersion section 11 into the liquid transport assembly 3 for delivery to the spray element.

Optionally, a filler is arranged at the lower part of the spraying element, the second absorption liquid sprayed by the spraying element passes through the filler from top to bottom, and the gas to be treated passes through the filler from bottom to top. The contact area of the gas to be treated and the second absorption liquid can be increased by arranging the filler, so that the gas to be treated and the second absorption liquid are fully contacted, the second absorption liquid is promoted to further absorb ammonia in the gas to be treated, the ammonia content in the gas to be treated is reduced again, and the ammonia concentration of the second absorption liquid is increased.

Optionally, the liquid transfer assembly 3 comprises a communication tube and one or more pump bodies 4. The communicating pipe is used for communicating the liquid outlet and the spraying element. The pump body 4 is provided in the communicating pipe, and in the case where the liquid transfer set 3 includes a plurality of pump bodies, the plurality of pump bodies are connected in parallel. So arranged, the first absorption liquid can be transported from the liquid outlet of the immersion section 11 to the spray element.

The parallel connection enables each pump body 4 to be controlled through the valve body respectively, when the input flow of the gas to be treated is large, the plurality of pump bodies 4 are opened, so that the second absorption liquid can be conveyed through the plurality of pump bodies and sprayed, the spraying strength of the second absorption liquid is enhanced, and the ammonia recovery rate is further improved; on the contrary, when the input flow of the gas to be treated is smaller, the single pump body 4 is started, and the second absorption liquid can be circularly conveyed and sprayed only through the single pump body 4, so that the energy is saved.

Optionally, the ammonia gas recovery system provided by the embodiments of the present disclosure further includes a liquid discharge assembly 5. By providing the liquid discharge unit 5, a certain amount of ammonia water can be discharged for recycling.

Optionally, a liquid discharge assembly 5 communicates with the liquid outlet for discharging a second portion of the first absorption liquid. The liquid discharge assembly 5 can discharge a certain amount of ammonia water with lower concentration for recycling.

Wherein the first portion of the first absorption liquid is greater than the second portion of the first absorption liquid. By the arrangement, ammonia in the gas to be treated can be further recovered, and the ammonia concentration of the first part can be improved to obtain ammonia water with higher concentration; the second part is ammonia water with lower concentration.

In some embodiments, a bubble-cap tray section 13 is disposed above the spray section 12 and in communication with the spray section 12, the bubble-cap tray section 13 flowing a third absorption liquid, the top of the bubble-cap tray section 13 being provided with a vent.

Alternatively, bubble cap tray section 13 refers to a tray column having bubble caps as the gas-liquid contacting elements on the tray. Wherein, the third absorption liquid continuously enters from the upper part of the tower, and a liquid layer is accumulated on each plate to form a liquid seal; the gas to be treated enters from the spraying section 12, disperses into small bubbles through the slots or small grooves on the bottom edge of the bubble cap, fully contacts the third absorption liquid, passes through the liquid layer to reach the liquid level, and then rises into the exhaust port at the top of the bubble cap tray section 13.

Optionally, the third absorption liquid is desalted water. The solubility of ammonia in desalted water is higher, so that the ammonia content in the gas to be treated can be further reduced.

The ammonia content in the exhaust gas of the exhaust port purge gas is less than or equal to 0.5 percent (V percent) through three-stage absorption, the load of a downstream washing absorption section is reduced, the concentration of ammonia water is greatly improved, the efficient recycling is realized, and the environmental protection performance and the economic performance of an ammonia recovery system are improved.

In some embodiments, the ammonia recovery system further comprises an exhaust pipe, a control valve, and a pressure sensor.

The exhaust pipe is communicated with the exhaust port and is used for exhausting the treated gas; the control valve is arranged on the exhaust pipe and used for controlling the opening and closing of the exhaust pipe and the opening degree; the pressure sensor 6 is used for acquiring a target pressure, which is the pressure of the gas to be treated in the ammonia wash tower. The target pressure can be adjusted by adjusting the opening degree of the control valve.

The opening degree of the control valve can be adjusted to be small to raise the target pressure, and the opening degree of the control valve can be adjusted to be large to lower the target pressure.

In some embodiments, the target pressure is adjustable in the range of 1.6 (G) MPa to 1.8 (G) MPa. For example, the target pressure is 1.6 (G) MPa, 1.7 (G) MPa, 1.8 (G) MPa, or the like. By the arrangement, the solubility of ammonia in the absorption liquid can be improved, and the ammonia content in the gas to be treated can be further reduced.

The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may include structural and other modifications. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An ammonia recovery system comprising an ammonia wash tower, the ammonia wash tower comprising:

the immersion section is provided with an air inlet, the immersion section can be filled with a first absorption liquid, and gas to be treated can enter the first absorption liquid through the air inlet;

the spraying section is arranged above the immersing section and communicated with the immersing section, the spraying section is provided with a spraying element and two sections of packing layers, the spraying element is arranged above the two sections of packing layers, and the spraying element can spray the second absorption liquid towards the two sections of packing layers;

the bubble cap column plate section is arranged above the spraying section and is communicated with the spraying section, the bubble cap column plate section flows with a third absorption liquid, and the top of the bubble cap column plate section is provided with an exhaust port;

wherein the first absorption liquid, the second absorption liquid and the third absorption liquid can absorb ammonia in the gas to be treated.

2. The ammonia recovery system of claim 1, further comprising:

the liquid transmission component is connected with the immersion section at one end and the spraying element at the other end, and can absorb the first absorption liquid from the immersion section and convey the absorbed first absorption liquid to the spraying element; the first part of the first absorption liquid is conveyed to the spraying element by the liquid conveying component, and the first part of the first absorption liquid is the second absorption liquid.

3. An ammonia recovery system according to claim 2, wherein the bottom of the immersion section is provided with a liquid outlet, the liquid transfer assembly comprising:

a communicating pipe for communicating the liquid outlet and the spray member; and, a step of, in the first embodiment,

and one or more pump bodies arranged on the communicating pipe, wherein when the liquid transmission assembly comprises a plurality of pump bodies, the plurality of pump bodies are connected in parallel.

4. An ammonia recovery system as defined in claim 1, wherein,

the air inlet is arranged at the lower part of the side wall of the immersed section, and/or the air inlet is arranged at the bottom of the immersed section.

5. The ammonia recovery system of claim 1, further comprising:

and the cooling water circulation assembly is used for cooling the first absorption liquid in the immersed section.

6. An ammonia recovery system as defined in claim 5 wherein the cooling water circulation assembly comprises:

the cooling coil is arranged in the immersion section, and a cooling liquid inlet and a cooling liquid outlet are formed on the side wall of the immersion section; the low-temperature cooling liquid can enter the cooling coil pipe through the cooling liquid inlet, exchange heat with the first absorption liquid in the immersed section in the cooling coil pipe, and flow out of the cooling coil pipe through the cooling liquid outlet.

7. An ammonia recovery system as defined in claim 3, further comprising:

and the liquid discharging assembly is communicated with the liquid outlet and is used for discharging the second part of the first absorption liquid.

8. The ammonia recovery system of claim 1, further comprising:

an exhaust pipe communicated with the exhaust port;

the control valve is arranged on the exhaust pipe; and, a step of, in the first embodiment,

the pressure sensor is used for acquiring target pressure, and the target pressure is the pressure of the gas to be treated in the ammonia washing tower; the target pressure can be adjusted by adjusting the opening degree of the control valve.

9. An ammonia recovery system as defined in claim 8, wherein,

the adjustable range of the target pressure is 1.6 MPa-1.8 MPa.

10. An ammonia recovery system as defined in any one of claims 1 to 9 wherein,

the first absorption liquid is water; and/or the number of the groups of groups,

the third absorption liquid is desalted water.