Nitrogen recovery device for process cooling

Abstract

The utility model relates to the technical field of ammonia gas recovery, and discloses a nitrogen recovery device for process cooling, which comprises a collecting pipe, a heat exchanger, an activated carbon adsorption device and a centrifugal fan, the heat exchanger is connected with the activated carbon adsorption device through a first conveying pipe, and the activated carbon adsorption device is connected with the centrifugal fan through a second conveying pipe. Partition plates are evenly and fixedly installed in the activated carbon adsorption device at equal intervals, and heat exchange plates are fixedly installed on the three partition plates. Due to the design of the plurality of groups of heat exchange plates, heat can be more uniformly transferred to an activated carbon bag, so that the temperature in the activated carbon adsorption device is increased, the activated carbon is subjected to desorption motion, the adsorption and desorption motion is carried out in the same space, the manual participation degree is reduced, and the efficiency is improved. And the efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of ammonia recovery, in particular to a nitrogen recovery device for process cooling. Background Art

[0002] The cooling effect of nitrogen mainly comes from its physical properties, that is, the gas absorbs heat when it expands and releases heat when it contracts. Therefore, by passing nitrogen into the object to be cooled and allowing the nitrogen to expand and contract in the system, the heat in the object to be cooled can be taken away and its temperature can be lowered. Therefore, ammonia is widely used in industrial cooling. Nitrogen recovery technology uses separation technology to separate nitrogen from air in industrial waste gas, and then recycles nitrogen through compression, condensation, adsorption and other methods.

[0003] The existing equipment has the following problems when recovering ammonia using activated carbon adsorption method:

[0004] (1) The environmental conditions required for activated carbon adsorption and desorption activities are different, so the adsorbed activated carbon needs to be transferred artificially, which is labor-intensive and inefficient.

[0005] (2) Since the temperature for desorption of ammonia from activated carbon only needs to be around 120°, the existing steam adsorption wastes energy and also affects the regeneration rate of activated carbon.

[0006] Therefore, we propose a nitrogen recovery device for process cooling to solve the above problems. Utility Model Content

[0007] The utility model aims to solve the problems existing in the prior art and proposes a nitrogen recovery device for process cooling.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A nitrogen recovery device for process cooling, comprising a collecting pipe, a heat exchanger, an activated carbon adsorption device and a centrifugal fan, wherein the heat exchanger and the activated carbon adsorption device, and the activated carbon adsorption device and the centrifugal fan are connected through a first delivery pipe and a second delivery pipe respectively, and baffles are fixedly installed at equal intervals inside the activated carbon adsorption device, and heat exchange plates are fixedly installed on three baffles;

[0010] The inside of the heat exchange plate is fixedly installed with a serpentine elbow.

[0011] Preferably, an air inlet pipe and an air outlet pipe are fixedly installed inside the partition, and the air inlet pipe and the air outlet pipe are respectively connected to the air inlet and the air outlet of the serpentine elbow.

[0012] Preferably, a heat inlet pipe is fixedly mounted on the collecting pipe, a heat outlet pipe is fixedly mounted on the first conveying pipe, the heat inlet pipe is connected to a plurality of air inlet pipes, and the heat outlet pipe is connected to a plurality of air outlet pipes.

[0013] Preferably, the first delivery pipe, the heat inlet pipe and the heat outlet pipe are all provided with electric control valves.

[0014] Preferably, a two-way pipe is embedded and installed on the centrifugal fan, and an electric control valve is also provided on the two-way pipe.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] (1) The utility model is provided with partitions and heat exchange plates, and the activated carbon package is placed between the heat exchange plates. The design of multiple groups of heat exchange plates allows heat to be transferred to the activated carbon package more evenly, thereby increasing the temperature inside the activated carbon adsorption device to cause the activated carbon to desorb. The adsorption and desorption activities are carried out in the same space, reducing the degree of manual participation and achieving higher efficiency.

[0017] (2) The utility model is provided with a heat inlet pipe, a heat outlet pipe, an exhaust pipe, a partition, a heat exchange plate and an air inlet pipe. The heat exchange medium is directly derived from the mixed gas after industrial cooling. This can effectively save energy, make full use of the thermal energy of the mixed gas, and also save the process of heat exchange of this part of the gas.

[0018] (3) The utility model is provided with a serpentine bend, so that the heat exchange medium can move a longer distance and stay longer inside the serpentine bend, thereby fully exchanging heat, thereby making the heat exchange efficiency between the heat exchange plate and the heat exchange medium higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of a nitrogen recovery device for process cooling proposed by the utility model;

[0020] Figure 2 This is a schematic diagram of the installation of a partition plate and a heat exchange plate of a nitrogen recovery device for process cooling proposed by the utility model;

[0021] Figure 3 This is a schematic diagram of a gas heat exchange channel of a nitrogen recovery device for process cooling proposed by the utility model;

[0022] Figure 4 This is a schematic diagram of the internal structure of a heat exchange plate of a nitrogen recovery device for process cooling proposed by the utility model.

[0023] In the figure: 1. collecting pipe; 2. heat exchanger; 3. first conveying pipe; 4. activated carbon adsorption device; 5. second conveying pipe; 6. centrifugal fan; 7. heat inlet pipe; 8. heat discharge pipe; 9. electric control valve; 10. two-way pipeline; 11. exhaust pipe; 12. partition; 13. heat exchange plate; 14. air inlet pipe; 15. serpentine pipe. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1 - Figure 4 A nitrogen recovery device for process cooling includes a collecting pipe 1, a heat exchanger 2, an activated carbon adsorption device 4 and a centrifugal fan 6. The heat exchanger 2 and the activated carbon adsorption device 4, the activated carbon adsorption device 4 and the centrifugal fan 6 are connected through a first delivery pipe 3 and a second delivery pipe 5 respectively.

[0026] The collecting pipe 1 is used to absorb the mixed gas after industrial cooling. Since the mixed gas contains a large amount of heat energy at this time, the adsorption effect of activated carbon is poor at this temperature, so the mixed gas flows into the heat exchanger 2 through the collecting pipe 1 for heat exchange, and then the mixed gas with reduced temperature flows into the activated carbon adsorption device 4 through the first conveying pipe 3 to carry out the activity of activated carbon adsorption of nitrogen.

[0027] When the adsorption activity is in progress, nitrogen is adsorbed on the activated carbon (the optimal temperature for the activated carbon to adsorb ammonia is about 30°), and the remaining gas moves through the centrifugal fan 6 and is then discharged into the atmosphere.

[0028] Partitions 12 are evenly and equidistantly fixed inside the activated carbon adsorption device 4, and heat exchange plates 13 are fixedly installed on three partitions 12. The activated carbon package is placed between the heat exchange plates 13. The design of multiple groups of heat exchange plates 13 allows heat to be transferred to the activated carbon package more evenly.

[0029] The temperature of the heat exchange plate 13 can be increased, thereby increasing the temperature inside the activated carbon adsorption device 4 (the optimal temperature for desorption of ammonia by activated carbon is about 120°), causing the activated carbon to desorb ammonia inside the activated carbon, and then collecting it through the centrifugal fan 6;

[0030] The heat exchange plates 13 are all fixedly provided with serpentine elbows 15, so that the heat exchange medium can move a longer distance and stay longer inside the serpentine elbows 15, thereby fully exchanging heat, thereby making the heat exchange efficiency between the heat exchange plates 13 and the heat exchange medium higher.

[0031] An air intake pipe 14 and an exhaust pipe 11 are fixedly installed inside the partition 12. The air intake pipe 14 and the exhaust pipe 11 are respectively connected to the air intake and the air outlet of the serpentine bend pipe 15. The heat exchange medium is transported in through the air intake pipe 14, then fully flows inside the serpentine bend pipe 15, and then leaves through the exhaust pipe 11.

[0032] A heat inlet pipe 7 is fixedly installed on the collecting pipe 1 , a heat outlet pipe 8 is fixedly installed on the first conveying pipe 3 , the heat inlet pipe 7 is connected to a plurality of air inlet pipes 14 , and the heat outlet pipe 8 is connected to a plurality of air outlet pipes 11 .

[0033] The heat exchange medium is directly derived from the mixed gas that has completed industrial cooling, which can effectively save energy and make full use of the thermal energy of the mixed gas. The mixed gas is transported to the intake pipe 14 through the heat inlet pipe 7, then flows in the serpentine bend 15, and then merges into the heat discharge pipe 8 through the exhaust pipe 11. The gas inside the heat discharge pipe 8 is then merged into the first delivery pipe 3, eliminating the heat exchange process.

[0034] The first delivery pipe 3, the heat inlet pipe 7 and the heat outlet pipe 8 are all provided with an electric control valve 9, through which the opening and closing of the pipe can be controlled, thereby controlling the flow of the gas.

[0035] A two-way pipe 10 is embedded and installed on the centrifugal fan 6, and an electric control valve 9 is also provided on the two-way pipe 10. One channel of the two-way pipe 10 can be directly connected to the atmosphere. When the activated carbon adsorption activity is carried out, the remaining gas can be directly discharged through this. The other channel of the two-way pipe 10 can be connected to a collection device to collect nitrogen.

[0036] The working process of the utility model is as follows: first, the mixed gas after industrial cooling is transported to the heat exchanger 2 through the collecting pipe 1 for heat exchange, and then the mixed gas with reduced temperature flows into the activated carbon adsorption device 4 through the second transport pipe 5 to carry out the activity of activated carbon adsorption of nitrogen.

[0037] The active nitrogen is adsorbed on the activated carbon (the optimal temperature for the activated carbon to adsorb ammonia is about 30°), and the remaining gas is moved by the centrifugal fan 6 and then discharged into the atmosphere through one channel in the double-pass pipeline 10.

[0038] After the adsorption is completed, the activated carbon can be desorbed. The electric control valve 9 on the first delivery pipe 3 is closed, and the electric control valve 9 on the heat inlet pipe 7 is opened. At this time, the high-temperature mixed gas inside the collecting pipe 1 will enter the heat inlet pipe 7. The high-temperature mixed gas is transported to the intake pipe 14 through the heat inlet pipe 7, and then flows in the serpentine bend 15, and then merges into the heat discharge pipe 8 through the exhaust pipe 11. The gas inside the heat discharge pipe 8 is then merged into the first delivery pipe 3, eliminating the heat exchange process.

[0039] The high-temperature mixed gas will move a longer distance and stay longer inside the serpentine bend 15, thereby fully exchanging heat, making the heat exchange efficiency between the heat exchange plate 13 and the heat exchange medium higher. The activated carbon bag is placed between the heat exchange plates 13, and the heat can be transferred to the activated carbon bag more evenly, so that the temperature inside the activated carbon adsorption device 4 becomes higher (the optimal temperature for desorption of ammonia by activated carbon is about 120°), causing the activated carbon to desorb and desorb the ammonia inside the activated carbon. The desorbed ammonia is collected through another channel of the double-pass pipe 10 under the action of the centrifugal fan 6.

[0040] It is obvious 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 features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A nitrogen recovery device for process cooling, comprising a collecting pipe (1), a heat exchanger (2), an activated carbon adsorption device (4) and a centrifugal fan (6), wherein the heat exchanger (2) and the activated carbon adsorption device (4), and the activated carbon adsorption device (4) and the centrifugal fan (6) are connected through a first delivery pipe (3) and a second delivery pipe (5), respectively, and characterized in that: Partitions (12) are evenly and evenly fixedly installed inside the activated carbon adsorption device (4), and heat exchange plates (13) are fixedly installed on the three partitions (12); The heat exchange plates (13) are all fixedly provided with serpentine elbows (15).

2. A nitrogen recovery device for process cooling according to claim 1, characterized in that: An air intake pipe (14) and an air exhaust pipe (11) are fixedly installed inside the partition (12), and the air intake pipe (14) and the air exhaust pipe (11) are respectively connected to the air intake port and the air outlet port of the serpentine curved pipe (15).

3. A nitrogen recovery device for process cooling according to claim 2, characterized in that: A heat inlet pipe (7) is fixedly mounted on the collecting pipe (1), a heat outlet pipe (8) is fixedly mounted on the first conveying pipe (3), the heat inlet pipe (7) is connected to a plurality of air inlet pipes (14), and the heat outlet pipe (8) is connected to a plurality of air outlet pipes (11).

4. A nitrogen recovery device for process cooling according to claim 3, characterized in that: The first delivery pipe (3), the heat inlet pipe (7) and the heat outlet pipe (8) are all provided with electric control valves (9).

5. A nitrogen recovery device for process cooling according to claim 1, 2, 3 or 4, characterized in that: A two-way pipe (10) is inlaid and installed on the centrifugal fan (6), and an electric control valve (9) is also arranged on the two-way pipe (10).

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