An ammonia recovery device for ammonia synthesis.

Abstract

This utility model discloses an ammonia recovery device for synthetic ammonia production, comprising: a recovery tower with an outlet at the top and a closed-loop design that ensures the exhaust gas concentration is far below the national standard limit, eliminating odor pollution; a combination design of a cyclone separator and a spiral guide plate, which increases the gas-liquid separation efficiency to 99%, preventing unseparated liquid from entering the compressor and causing liquid slugging risk; a drain outlet at the bottom of the absorbent storage tank that is directly connected to the ammonia water treatment system to prevent overflow after the absorbent is saturated, resulting in a compact structure and strong adaptability; modular connection of various components through pipelines, reducing the floor space by 40% compared to traditional split-type equipment; a cooler compatible with circulating water or refrigerant, adaptable to different operating conditions, and the packing layer can be selected from corrugated plates or Pall rings to meet different processing capacity requirements. Calculated based on a certain scale of annual synthetic ammonia production, this device can recover a large amount of ammonia annually, resulting in significant direct economic benefits, while reducing the risk of environmental fines and a short investment payback period.

Description

Technical Field

[0001] This utility model relates to the field of synthetic ammonia preparation technology, and in particular to an ammonia recovery device for synthetic ammonia preparation. Background Technology

[0002] The synthetic ammonia industry is a fundamental industry of the national economy, with ammonia as a core product widely used in fertilizers, pharmaceuticals, and chemicals. However, during the synthesis of ammonia, incomplete reactions and equipment sealing limitations can generate ammonia-containing tail gas. Direct emission of this gas not only wastes raw materials (loss of each ton of ammonia can increase production costs by 15% to 20%), but also causes environmental pollution (ammonia is a foul-smelling gas with strong irritation to human mucous membranes and is a precursor to greenhouse gases), and poses an explosion risk (the explosion limit of ammonia is 15% to 28%).

[0003] Existing ammonia recovery technologies are mainly divided into three categories:

[0004] 1. Condensation method: Ammonia gas is liquefied and recovered by low-temperature condensation, but the recovery rate for low-concentration ammonia gas (below 10%) is less than 60%, and a large amount of cooling energy is required.

[0005] 2. Absorption method: Ammonia gas is absorbed using water or dilute ammonia water, but traditional spray absorption towers have the problem of insufficient gas-liquid contact, with an absorption rate of only 70% to 80%, and the recycling rate of the absorbent is low; 3. Adsorption method: Activated carbon or molecular sieves are used for adsorption. Although it is suitable for low-concentration tail gas, the adsorbent needs to be regenerated frequently (every eight to twelve hours), resulting in poor equipment operation continuity and high maintenance costs.

[0006] Furthermore, existing technologies mostly involve single processes connected in series, lacking a closed-loop design. Unabsorbed ammonia gas is easily emitted directly, making it difficult to meet the ammonia emission concentration limits in the "Water Pollutant Discharge Standard for Synthetic Ammonia Industry". Therefore, there is an urgent need to develop a high-efficiency, low-consumption, closed-loop ammonia recovery device to solve the problems of low recovery rate, high energy consumption, and difficulty in meeting environmental standards in existing technologies. Utility Model Content

[0007] In order to overcome the shortcomings of the prior art, one of the objectives of this utility model is to provide an ammonia recovery device for the preparation of synthetic ammonia.

[0008] One of the objectives of this utility model is achieved through the following technical solution:

[0009] An ammonia recovery device for ammonia synthesis includes:

[0010] The recovery tower has an air outlet at the top and a liquid inlet at the bottom.

[0011] A cooler, connected to the outlet of the recovery tower, is used to cool ammonia-containing gas;

[0012] A compressor, connected to the outlet of the cooler, is used to pressurize the cooled gas;

[0013] An absorbent storage tank is connected to the outlet of the compressor and is filled with absorbent liquid.

[0014] A circulating pump, with one end connected to the absorbent storage tank and the other end connected to the inlet of the recovery tower, is used to circulate the absorbent to the top of the recovery tower.

[0015] A separator, connected to the outlet of the absorbent storage tank, is used to separate the liquid from the unabsorbed gas;

[0016] The gas outlet of the separator is connected to the inlet of the compressor via a pipeline, forming a circulation loop.

[0017] Furthermore, the cooler has a tubular structure, including a cooling medium inlet and an outlet, wherein the cooling medium is circulating water or refrigerant.

[0018] Furthermore, the absorbent storage tank is equipped with a distributor, which is connected to the outlet pipe of the compressor to uniformly disperse the pressurized gas in the absorbent.

[0019] Furthermore, the separator is a cyclone separator with an internal spiral guide plate for accelerating gas-liquid separation.

[0020] Furthermore, the recovery tower is provided with multiple layers of packing material, which are corrugated plate packing or Pall ring packing.

[0021] Furthermore, a flow meter is installed between the gas outlet of the recovery tower and the cooler to monitor the gas flow rate.

[0022] Furthermore, the bottom of the absorbent storage tank is provided with a drain port, which is connected to the ammonia water treatment system.

[0023] Furthermore, a pressure sensor is provided between the compressor and the absorbent storage tank to monitor the pressure inside the tank and control the compressor to start and stop in conjunction with the pressure.

[0024] Furthermore, the inlet of the recovery tower is equipped with an atomizing nozzle, which is connected to the circulating pump and is used to atomize and spray the absorbent liquid.

[0025] Furthermore, the liquid outlet of the separator is connected to the absorbent storage tank via a pipeline, and the gas outlet is connected to the inlet of the compressor via a pipeline, forming a closed loop.

[0026] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0027] 1. Significantly Improved Recovery Rate: Through a closed-loop design of "cooling-pressurization-absorption-separation," unabsorbed ammonia is recovered by the separator and re-enters the compressor for processing. Combined with the synergistic effect of the packing layer in the recovery tower and the distributor in the absorbent storage tank, the ammonia recovery rate can reach over 95%, which is 15% to 25% higher than the traditional single absorption method. 2. Reduced Energy Consumption: The use of a circulating pump to achieve closed-loop circulation of the absorbent, along with pressure sensor-based control of the compressor's start and stop, reduces energy consumption by 30% to 40% compared to the traditional continuous pressurization mode. A single unit can save tens of thousands of kilowatt-hours of electricity annually.

[0028] 3. The closed-loop design ensures that the exhaust gas emission concentration is far below the national standard limit, eliminating odor pollution;

[0029] The combined design of the cyclone separator and the spiral guide plate increases the gas-liquid separation efficiency to 99%, avoiding the risk of liquid slugging caused by unseparated liquid entering the compressor.

[0030] The drain outlet at the bottom of the absorbent storage tank is directly connected to the ammonia water treatment system to prevent the absorbent from overflowing after it becomes saturated.

[0031] 4. Compact structure and strong adaptability: The components of the device are connected in a modular way through pipes, reducing the floor space by 40% compared with traditional split equipment; the cooler is compatible with circulating water or refrigerant, and can adapt to different working conditions; the packing layer can be corrugated plate or Pall ring to meet different processing capacity requirements.

[0032] 5. Based on a certain scale of ammonia synthesis plant per year, this plant can recover a large amount of ammonia gas annually, resulting in significant direct economic benefits, while reducing the risk of environmental fines and having a short investment payback period.

[0033] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0034] Figure 1 This is a front view of this embodiment;

[0035] Figure 2 This is a perspective view of this embodiment;

[0036] Figure 3 This is the rear view of this embodiment;

[0037] Figure 4 This is a cross-sectional schematic diagram of the component separator in this embodiment;

[0038] Figure 5 This is a cross-sectional schematic diagram of the component absorbent storage tank in this embodiment;

[0039] Figure 6 This is a cross-sectional schematic diagram of the component recovery tower in this embodiment.

[0040] In the diagram: 1. Recovery tower; 11. Gas outlet; 12. Liquid inlet; 13. Multi-layer packing layer; 2. Cooler; 21. Cooling medium inlet; 22. Outlet; 3. Compressor; 4. Absorbent storage tank; 41. Distributor; 42. Drain; 5. Circulation pump; 51. Atomizing nozzle; 6. Separator; 61. Spiral guide plate; 7. Flow meter; 8. Pressure sensor. Detailed Implementation

[0041] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0042] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0044] Please see Figures 1 to 6 The ammonia recovery device for ammonia synthesis in this embodiment includes:

[0045] The recovery tower 1 has an air outlet 11 at the top and a liquid inlet 12 at the bottom;

[0046] Cooler 2 is connected to the outlet 11 of the recovery tower 1 and is used to cool ammonia-containing gas;

[0047] Compressor 3, connected to the outlet of cooler 2, is used to pressurize the cooled gas;

[0048] Absorbent storage tank 4 is connected to the outlet of compressor 3 and is filled with absorbent liquid;

[0049] A circulating pump 5, connected at one end to the absorbent storage tank 4 and at the other end to the inlet 12 of the recovery tower 1, is used to circulate the absorbent to the top of the recovery tower. A separator 6, connected to the outlet of the absorbent storage tank 4, is used to separate the liquid from the unabsorbed gas. The gas outlet of the separator 6 is connected to the inlet of the compressor 3 via a pipe, forming a circulation loop. The cooler 2 has a tubular structure, including a cooling medium inlet 21 and an outlet 22. The cooling medium is circulating water or refrigerant. A distributor 41 is installed inside the absorbent storage tank 4, connected to the outlet pipe of the compressor 3, to uniformly disperse the pressurized gas in the absorbent. The separator 6 is a cyclone separator with an internal spiral guide plate 61 to accelerate gas-liquid separation. The recovery tower 1 is equipped with multiple layers of packing 13, which are corrugated plate packing or Pall ring packing. A flow meter 7 is installed between the gas outlet 11 of the recovery tower 1 and the cooler 2 to monitor the gas flow. The bottom of the absorbent storage tank 4 is equipped with a drain port 42, which is connected to the ammonia water treatment system. A pressure sensor 8 is installed between the compressor 3 and the absorbent storage tank 4 to monitor the pressure inside the tank and control the compressor to start and stop. An atomizing nozzle 51 is installed at the liquid inlet 12 of the recovery tower 1. The atomizing nozzle 51 is connected to the circulating pump 5 to atomize and spray the absorbent. The liquid outlet of the separator 6 is connected to the absorbent storage tank 4 through a pipeline, and the gas outlet is connected to the inlet of the compressor 3 through a pipeline, forming a closed loop.

[0050] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. An ammonia recovery apparatus for the synthesis of ammonia production, characterized by, include: The recovery tower (1) has an air outlet (11) at the top and a liquid inlet (12) at the bottom; Cooler (2), connected to the outlet (11) of the recovery tower (1), is used to cool ammonia-containing gas; A compressor (3) is connected to the outlet of the cooler (2) for pressurizing the cooled gas; An absorbent storage tank (4) is connected to the outlet of the compressor (3) and is filled with absorbent liquid. A circulating pump (5) is connected at one end to the absorbent storage tank (4) and at the other end to the inlet (12) of the recovery tower (1) for circulating the absorbent to the top of the recovery tower. A separator (6) is connected to the outlet of the absorbent storage tank (4) for separating liquid and unabsorbed gas; The gas outlet of the separator (6) is connected to the inlet of the compressor (3) through a pipeline to form a circulation loop.

2. The apparatus of claim 1, wherein, The cooler (2) has a tubular structure, including a cooling medium inlet (21) and an outlet (22), wherein the cooling medium is circulating water or refrigerant.

3. The apparatus of claim 1, wherein, The absorbent storage tank (4) is equipped with a distributor (41), which is connected to the outlet pipe of the compressor (3) to uniformly disperse the pressurized gas in the absorbent.

4. The apparatus of claim 1, wherein, The separator (6) is a cyclone separator with a spiral guide plate (61) inside to accelerate gas-liquid separation.

5. The apparatus of claim 1, wherein, The recovery tower (1) is provided with multiple layers of packing (13), which are corrugated plate packing or Pall ring packing.

6. The apparatus according to claim 1, characterized in that, A flow meter (7) is provided between the gas outlet (11) of the recovery tower (1) and the cooler (2) to monitor the gas flow rate.

7. The apparatus of claim 1, wherein, The bottom of the absorbent storage tank (4) is provided with a drain port (42), which is connected to the ammonia water treatment system.

8. The apparatus of claim 1, wherein, A pressure sensor (8) is provided between the compressor (3) and the absorbent storage tank (4) to monitor the pressure inside the tank and control the compressor to start and stop.

9. The apparatus of claim 1, wherein, The recovery tower (1) is provided with an atomizing nozzle (51) at the liquid inlet (12). The atomizing nozzle (51) is connected to the circulation pump (5) and is used to atomize and spray the absorbent liquid.

10. The apparatus of claim 1, wherein, The liquid outlet of the separator (6) is connected to the absorbent storage tank (4) via a pipe, and the gas outlet is connected to the inlet of the compressor (3) via a pipe, forming a closed loop.

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