Recovery device for gaseous ammonia in inert gas exhausted by mixed refrigeration device

Abstract

A device for recovering gaseous ammonia in inert gas discharged by a mixed refrigeration device comprises an inert gas discharging pipeline, the inert gas discharging pipeline is connected with an absorber, a dilute ammonia water pipeline is connected with the absorber, a coil pipe is connected with the absorber through a pipeline, and a plurality of sprayers are arranged on the upper portion of an absorption tank and connected with a return valve II and a one-way valve through pipelines. An inert gas discharge pipeline is arranged at the top of the absorption tank, the discharge valve and the ammonia concentration sensor are located on the inert gas discharge pipeline, the bottom of the absorption tank is connected with a pump inlet through a pipeline, and a pump outlet is connected with the water cooler. The inert gas is uniformly introduced into the absorption tank from the small holes of the coil pipe to be in direct contact with low-concentration ammonia water, the ammonia water in the absorption tank is conveyed to the water cooler through the pump to cool the low-concentration ammonia water, and then the ammonia water is conveyed to the absorption sprayer to further spray and absorb the ammonia gas in the tank again, so that the purpose of absorbing the ammonia gas in the inert gas is achieved. Meanwhile, environmental pollution is reduced, and the potential safety hazard that gas ammonia easily causes poisoning and suffocation of field personnel after the inert gas is exhausted is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas recovery and reuse, and in particular to a device for recovering ammonia from inert gas exhausted from a mixed refrigeration device. Background Art

[0002] Ammonia refrigeration systems are commonly used in industry. During the operation of the ammonia absorber in a mixed refrigeration unit, a small amount of nitrogen from the seal gas of the ammonia compressor dry gas seal will leak into the gas ammonia system. Since dilute ammonia water has no absorption capacity for inert gases, nitrogen will accumulate as the system operates, gradually increasing the absorber pressure. This increases the unit load and reduces the cooling effect of the ammonia absorber, necessitating regular inert gas removal to control the absorber pressure. Although an exhaust scrubber is currently installed in a mixed refrigeration unit, the absorption effect is poor. The exhaust gas after absorption still contains 19.3% NH3, which pollutes the environment and wastes energy when discharged into the air. Furthermore, during the inert gas removal process, the ammonia water in the exhaust scrubber is at atmospheric pressure. Because the volatilization pressure of the gas ammonia is higher than the static pressure generated by the exhaust scrubber's installation height, the scrubbing ammonia water produced by the exhaust scrubber cannot be discharged into the underground discharge tank, causing the equipment to be unable to function properly. Utility Model Content

[0003] In order to solve the problems of incomplete recovery of ammonia in the exhaust inert gas of existing mixed refrigeration devices, on-site discharge causing environmental pollution and waste of large amounts of ammonia discharged as resources, and at the same time solve the defect that ammonia after the exhaust inert gas is easily prone to poisoning, suffocation and other safety hazards for on-site personnel, the purpose of the utility model is to provide a device for recovering ammonia in the exhaust inert gas of a mixed refrigeration device.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a device for recovering ammonia from the exhaust inert gas of a mixed refrigeration device, comprising an exhaust inert gas pipeline 1, a dilute ammonia water pipeline 2, an absorber 3, a coil 4, an absorption tank 5, a sprayer 6, a reflux valve I7, a discharge valve 8, an ammonia concentration sensor 9, a liquid level sensor 10, an ammonia water concentration sensor 11, a pump 12, a water cooler 13, a reflux valve II 14, a one-way valve 15, a reflux valve III 16, an ammonia water tank 17, and a controller 18.

[0005] The exhaust pipeline 1 is connected to the absorber 3, the dilute ammonia water pipeline 2 is connected to the absorber 3, the coil 4 is connected to the absorber 3 through a pipeline and is located in the absorption tank 5, and a plurality of sprayers 6 are provided on the upper part of the absorption tank 5, and the sprayers 6 are connected to the reflux valve II 14 and the one-way valve 15 through a pipeline.

[0006] An inert gas discharge pipeline is provided on the top of the absorption tank 5 , the discharge valve 8 and the ammonia concentration sensor 9 are located on the inert gas discharge pipeline, the reflux valve I 7 is located on the reflux pipeline, and the absorption tank 5 is provided with a liquid level sensor 10 .

[0007] The bottom of the absorption tank 5 is connected to the inlet of the pump 12 through a pipeline, the ammonia concentration sensor 11 is located on its pipeline, the outlet of the pump 12 is connected to the water cooler 13, and the reflux valve III 16 is located on the pipeline connecting the water cooler 13 and the ammonia tank 17.

[0008] The controller 18 is connected to the reflux valve I7, the discharge valve 8, the ammonia concentration sensor 9, the liquid level sensor 10, the ammonia concentration sensor 11, the reflux valve II 14, the one-way valve 15, and the reflux valve III 16 through signal lines.

[0009] Furthermore, the dilute ammonia water pipeline 2 and the exhaust pipeline 1 are arranged opposite to each other on the absorber 3 and the number of pipelines is the same.

[0010] Furthermore, air holes are evenly distributed on the surface of the coil 4 .

[0011] Furthermore, the controller 18 is a programmable logic controller.

[0012] Compared with the existing gas ammonia recovery device, the utility model has the following advantages.

[0013] 1. The utility model relates to a device for recovering ammonia from inert gas discharged from a hybrid refrigeration device. A coil 4 is arranged in an absorption tank 5, so that inert gas is evenly introduced into the absorption tank 5 through the small holes of the coil 4 and directly contacts with low-concentration ammonia water. At the same time, a pump 12 sends the ammonia water in the absorption tank 5 to a water cooler 13 to cool the low-concentration ammonia water, and then sends it to a suction sprayer 6 for further spraying and absorbing the ammonia in the tank again, thereby achieving the purpose of absorbing the ammonia in the exhaust gas, reducing environmental pollution, and solving the potential safety hazard of poisoning and suffocation of on-site personnel caused by ammonia after the exhaust gas is discharged.

[0014] 2. The utility model provides a device for recovering ammonia from the exhaust inert gas of a hybrid refrigeration device. An ammonia concentration sensor 9 detects the ammonia concentration in the absorption tank 5 in real time. The exhaust inert gas with ammonia concentration that meets the standard is discharged to the atmosphere through the discharge valve 8, and the exhaust inert gas that does not meet the standard enters the absorption tank 5 again for absorption through the reflux valve I 7, thereby avoiding excessive emission and pollution of the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG1 is a schematic structural diagram of a device for recovering ammonia from inert gas discharged from a hybrid refrigeration device according to the present invention. DETAILED DESCRIPTION

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0017] In the description of the present invention, it should be noted that the terms "top", "bottom", "one side", "the other side", "front", "back", "middle", "inside", "top", "bottom end", etc., indicating positions or positional relationships, are based on the positions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention. The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, unless otherwise expressly specified or limited, the terms "mounted", "connected", and "connected" should be understood in a broad sense, for example, they can mean fixed connection, detachable connection, or integral connection; they can mean mechanical connection or electrical connection; they can mean direct connection, indirect connection through an intermediate medium, or internal communication between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] The present invention will be described in further detail below with reference to the accompanying drawings.

[0019] like Figure 1 As shown, the utility model provides a device for recovering ammonia from the exhaust inert gas of a hybrid refrigeration device, comprising an exhaust inert pipeline 1, a dilute ammonia water pipeline 2, an absorber 3, a coil 4, an absorption tank 5, a sprayer 6, a reflux valve I7, a discharge valve 8, an ammonia concentration sensor 9, a liquid level sensor 10, an ammonia water concentration sensor 11, a pump 12, a water cooler 13, a reflux valve II 14, a one-way valve 15, a reflux valve III 16, an ammonia water tank 17, and a controller 18.

[0020] The exhaust pipeline 1 is connected to the absorber 3, and the dilute ammonia water pipeline 2 is connected to the absorber 3. The dilute ammonia water pipeline 2 and the exhaust pipeline 1 are arranged opposite to each other on the absorber 3 and have the same number of pipelines. The coil 4 is connected to the absorber 3 through a pipeline and is located in the absorption tank 5. Air holes are evenly distributed on the surface of the coil 4. A number of sprayers 6 are arranged on the upper part of the absorption tank 5. The sprayers 6 are connected to the reflux valve II 14 and the one-way valve 15 through pipelines.

[0021] An inert gas discharge pipeline is provided on the top of the absorption tank 5 , the discharge valve 8 and the ammonia concentration sensor 9 are located on the inert gas discharge pipeline, the reflux valve I 7 is located on the reflux pipeline, and the absorption tank 5 is provided with a liquid level sensor 10 .

[0022] The bottom of the absorption tank 5 is connected to the inlet of the pump 12 through a pipeline, the ammonia concentration sensor 11 is located on its pipeline, the outlet of the pump 12 is connected to the water cooler 13, and the reflux valve III 16 is located on the pipeline connecting the water cooler 13 and the ammonia tank 17.

[0023] The controller 18 is connected to the reflux valve I7, the discharge valve 8, the ammonia concentration sensor 9, the liquid level sensor 10, the ammonia concentration sensor 11, the reflux valve II 14, the one-way valve 15, and the reflux valve III 16 through signal lines.

[0024] The specific working process is as follows: the inert gas enters the absorber 3 through the inert gas pipeline 1, and the dilute ammonia water enters the absorber 3 through the dilute ammonia water pipeline 2. Part of the gaseous ammonia in the inert gas is absorbed by the dilute ammonia water, and the unabsorbed gas enters the absorption tank 5 through the coil 4. During the first operation, the one-way valve 15 is opened to spray the desalted water into the absorption tank 5 through the sprayer 6. The atomized desalted water is fully in contact with the inert gas and absorbs the gaseous ammonia therein. The ammonia concentration sensor 9 detects the gaseous ammonia concentration in the gas discharged from the absorption tank 5. When the concentration is lower than the set value, the controller 18 opens the discharge valve 8 and closes the reflux valve I7 to discharge the gas into the atmosphere. When the concentration is higher than the set value, the controller 18 closes the discharge valve 8 and opens the reflux valve I7. The reflux valve I7 allows the gas to pass through the pipeline and re-enter the absorption tank 5 for gaseous ammonia absorption. The ammonia concentration sensor 11 detects the ammonia concentration in the desalted water discharged from the absorption tank 5. When the concentration is lower than the set value, the controller 18 opens the reflux valve II14 and closes the reflux valve III16. When the concentration is higher than the set value, the controller 18 closes the reflux valve II14 and opens the reflux valve III16 to allow the liquid to enter the ammonia tank 17 for collection and utilization. The liquid level sensor 10 detects the liquid level in the absorption tank 5. When the liquid level is higher than the set value, the controller reduces the opening of the one-way valve 15 to reduce the injection amount of desalted water. When the liquid level is lower than the set value, the controller increases the opening of the one-way valve 15 to supplement the injection amount of desalted water.

[0025] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0026] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A device for recovering ammonia from inert gas in a mixed refrigeration device, comprising an inert gas exhaust line (1), a dilute ammonia water line (2), an absorber (3), a coil (4), an absorption tank (5), a sprayer (6), a reflux valve I (7), a discharge valve (8), an ammonia concentration sensor (9), a liquid level sensor (10), an ammonia water concentration sensor (11), a pump (12), a water cooler (13), a reflux valve II (14), a one-way valve (15), a reflux valve III (16), an ammonia water tank (17), and a controller (18), characterized in that The inert gas discharge pipeline (1) is connected to the absorber (3), the dilute ammonia water pipeline (2) is connected to the absorber (3), the coil (4) is connected to the absorber (3) through a pipeline and is located in the absorption tank (5), a plurality of sprayers (6) are provided on the upper part of the absorption tank (5), the sprayers (6) are connected to the reflux valve II (14) and the one-way valve (15) through a pipeline, an inert gas discharge pipeline is provided on the top of the absorption tank (5), the discharge valve (8) and the ammonia concentration sensor (9) are located on the inert gas discharge pipeline, the reflux valve I (7) is located on the reflux pipeline, and the absorption tank (5) is provided with There is a liquid level sensor (10), the bottom of the absorption tank (5) is connected to the inlet of the pump (12) through a pipeline, the ammonia concentration sensor (11) is located on its pipeline, the outlet of the pump (12) is connected to the water cooler (13), the reflux valve III (16) is located on the pipeline connecting the water cooler (13) and the ammonia tank (17), and the controller (18) is respectively connected to the reflux valve I (7), the discharge valve (8), the ammonia concentration sensor (9), the liquid level sensor (10), the ammonia concentration sensor (11), the reflux valve II (14), the one-way valve (15), and the reflux valve III (16) through signal lines.

2. The device for recovering ammonia from the exhaust gas of a hybrid refrigeration device according to claim 1, characterized in that The dilute ammonia water pipeline (2) and the inert exhaust pipeline (1) are arranged opposite to each other on the absorber (3) and have the same number of pipelines.

3. The ammonia recovery device for exhausting inert gas from a hybrid refrigeration device according to claim 1, characterized in that The surface of the coil (4) is evenly distributed with air outlet holes.

4. The device for recovering ammonia from the exhaust inert gas of a hybrid refrigeration device according to claim 1, characterized in that The controller (18) is a programmable logic controller.

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