Device and method capable of preparing nitrogen with different pressures

Abstract

The invention relates to the technical field of pressure nitrogen, in particular to a device and method capable of preparing nitrogen with different pressures, the device comprises an air inlet, a lower rectification tower is connected to one side of the air inlet through a pipeline, a filler is arranged in the lower rectification tower, and one side of the lower rectification tower is communicated with an expansion machine through a pipeline; one end of the expansion machine is connected with a first nitrogen outlet, a first condensation evaporator is arranged on the upper side of the lower rectification tower, a top side pipeline of the first condensation evaporator is connected with an upper rectification tower, and a pipeline on one side of the upper rectification tower is communicated with a second nitrogen outlet. According to the scheme, the situation that cryogenic nitrogen making equipment cannot meet the requirements of different customers for nitrogen pressure is reduced, the overall energy consumption of the equipment in the operation process is reduced, the nitrogen extraction rate of the device is increased, the effect of saving more energy can be achieved through the device, and the requirements of different customers can be met.

Description

Technical Field

[0001] The invention relates to the technical field of pressure nitrogen, and in particular to a device and method for preparing nitrogen at different pressures. Background Art

[0002] In industrial production, nitrogen, as an important inert gas, is widely used in many fields such as chemical industry, electronics, and food. Different processes have different requirements for nitrogen pressure. Traditional nitrogen production devices can only provide nitrogen of a single pressure, so a device and method that can produce nitrogen of different pressures is needed.

[0003] Existing cryogenic nitrogen production equipment usually adopts a single-tower or double-tower process. The nitrogen pressure provided by these processes is relatively constant and cannot meet the user's demand for nitrogen at different pressures. Although the double-tower process improves the purity of nitrogen to a certain extent, its pressure regulation ability is limited and cannot flexibly respond to the needs of different users. Therefore, a device and method for producing nitrogen at different pressures are proposed. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a device and method for producing nitrogen at different pressures.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A device capable of producing nitrogen at different pressures comprises an air inlet, a pipeline on one side of the air inlet is connected to a lower distillation tower, a filler is arranged in the lower distillation tower, a pipe on one side of the lower distillation tower is connected to an expander, one end of the expander is connected to a first nitrogen outlet, a first condenser evaporator is arranged on the upper side of the lower distillation tower, a pipeline on the top side of the first condenser evaporator is connected to an upper distillation tower, and a pipeline on one side of the upper distillation tower is connected to a second nitrogen outlet.

[0006] Preferably, an air pretreatment component is provided at the air inlet, and the air pretreatment component includes a filter and a dryer, and outside air is transported to the air inlet.

[0007] Preferably, a second condenser-evaporator is provided on the upper side of the upper distillation tower, and a top pipe of the second condenser-evaporator is connected to the exhaust gas outlet.

[0008] Preferably, a main heat exchanger is disposed on one side of the air inlet, the first nitrogen outlet, the exhaust gas outlet and the second nitrogen outlet.

[0009] Preferably, a packing room is further provided in the lower distillation tower, and the packing is located in the packing room.

[0010] An operating method of a device capable of producing nitrogen at different pressures, characterized by comprising: S1, air pretreatment, the outside air passes through the air pretreatment component to remove impurities and moisture, and then passes through the main heat exchanger for gas heat exchange and cooling; S2, distillation separation: the gas after heat exchange enters the lower distillation tower in turn, gradually passes through the packing in the tower and flows from bottom to top, and finally obtains nitrogen as a low boiling point product at the top of the lower distillation tower; S3, expansion work pressure regulation: extract part of the nitrogen from the top of the lower distillation tower, reheat it in the main heat exchanger, and then send it to the expander to do work and reheat it again, and finally send it out from the first nitrogen outlet for supply; S4. In addition, the oxygen-rich gas at the top of the upper distillation tower will be transmitted to the upper distillation tower to complete heat exchange, and high-purity nitrogen will be obtained for supply again.

[0011] The beneficial effects of the present invention are: This solution reduces the inability of cryogenic nitrogen production equipment to meet the nitrogen pressure requirements of different customers, reduces the overall energy consumption of the equipment during operation, improves the nitrogen extraction rate of the device, and can also save more energy through the device, and can meet the needs of different customers. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The present invention provides a schematic structural diagram of a device and method for producing nitrogen at different pressures.

[0013] In the figure: 1. air inlet; 2. first nitrogen outlet; 3. exhaust gas outlet; 4. second nitrogen outlet; 5. main heat exchanger; 6. expander; 7. lower distillation tower; 8. upper distillation tower; 9. first condenser evaporator; 10. second condenser evaporator. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention will be described clearly and completely below 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.

[0015] Example: Refer to Figure 1 A device capable of producing nitrogen at different pressures comprises an air inlet 1, a pipe on one side of the air inlet 1 is connected to a lower distillation tower 7, a filler is arranged in the lower distillation tower 7, a pipe on one side of the lower distillation tower 7 is connected to an expander 6, one end of the expander 6 is connected to a first nitrogen outlet 2, a first condenser evaporator 9 is arranged on the upper side of the lower distillation tower 7, a pipe on the top side of the first condenser evaporator 9 is connected to an upper distillation tower 8, a pipe on one side of the upper distillation tower 8 is connected to a second nitrogen outlet 4, a main heat exchanger 5 is arranged on one side of the air inlet 1, the first nitrogen outlet 2, the exhaust gas outlet 3 and the second nitrogen outlet 4, a filler room is also arranged in the lower distillation tower 7, and the filler is located in the filler room.

[0016] Specifically, an air pretreatment component is provided at the air inlet 1, and the air pretreatment component includes a filter and a dryer. External air is transported at the air inlet 1.

[0017] Furthermore, a second condenser evaporator 10 is provided on the upper side of the upper distillation tower 8 , and a top pipe of the second condenser evaporator 10 is connected to the exhaust gas outlet 3 .

[0018] An operating method of a device capable of producing nitrogen at different pressures, characterized by comprising: S1, air pretreatment, the outside air passes through the air pretreatment component to remove impurities and moisture, and then passes through the main heat exchanger 5 for gas heat exchange cooling; S2, distillation separation: the gas after heat exchange enters the lower distillation tower 7 in sequence, and gradually flows from bottom to top through the fillers in the tower. During the flow, the gas exchanges heat with the liquid nitrogen refluxed from the top of the lower distillation tower 7 between the fillers, so that the high-boiling-point impurities remain in the refluxed liquid until it flows into the bottom of the lower distillation tower 7, and finally obtains the nitrogen gas of the low-boiling-point product at the top of the lower distillation tower 7; S3, expansion work pressure regulation: extract part of the nitrogen from the top of the lower distillation tower 7, reheat it through the main heat exchanger 5, and then transport it to the expander 6 to do work and reheat it again, and finally send it out from the first nitrogen outlet 2 to supply users; S4. In addition, the oxygen-rich gas at the top of the upper distillation tower 8 is transmitted to the upper distillation tower 8, and heat exchange is completed with the reflux nitrogen in the upper distillation tower 8. Finally, high-purity nitrogen is obtained at the top of the upper distillation tower 8, and a part of the nitrogen is drawn out and supplied to users again through the main heat exchanger 5.

[0019] The nitrogen pressure after expansion and the nitrogen pressure extracted from the top of the second tower can be set according to user needs.

[0020] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0021] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0022] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device capable of producing nitrogen at different pressures, characterized in that: include: An air inlet (1), a pipe on one side of the air inlet (1) is connected to a lower distillation tower (7), a filler is arranged in the lower distillation tower (7), a pipe on one side of the lower distillation tower (7) is connected to an expander (6), one end of the expander (6) is connected to a first nitrogen outlet (2), a first condenser evaporator (9) is arranged on the upper side of the lower distillation tower (7), a pipe on the top side of the first condenser evaporator (9) is connected to an upper distillation tower (8), and a pipe on one side of the upper distillation tower (8) is connected to a second nitrogen outlet (4).

2. The device for producing nitrogen at different pressures according to claim 1, characterized in that: An air pretreatment component is provided at the air inlet (1), the air pretreatment component comprising a filter and a dryer, and outside air is delivered to the air inlet (1).

3. The device for producing nitrogen at different pressures according to claim 2, characterized in that: A second condenser evaporator (10) is arranged on the upper side of the upper distillation tower (8), and a top pipe of the second condenser evaporator (10) is connected to the exhaust gas outlet (3).

4. The device for producing nitrogen at different pressures according to claim 3, characterized in that: A main heat exchanger (5) is provided on one side of the air inlet (1), the first nitrogen outlet (2), the exhaust gas outlet (3) and the second nitrogen outlet (4).

5. The device for producing nitrogen at different pressures according to claim 4, characterized in that: A packing room is also provided in the lower distillation tower (7), and the packing is located in the packing room.

6. A method for operating a device capable of producing nitrogen at different pressures according to any one of claims 1 to 5, characterized in that: include: S1, air pretreatment, the outside air passes through the air pretreatment component to remove impurities and moisture, and then passes through the main heat exchanger (5) to perform heat exchange and cooling of the gas; S2, distillation separation: the gas after heat exchange enters the lower distillation tower (7) in sequence, gradually passes through the packing in the tower and flows from bottom to top, and finally obtains nitrogen gas as a low boiling point product at the top of the lower distillation tower (7); S3, expansion work pressure regulation: a portion of nitrogen is extracted from the top of the lower distillation tower (7), reheated in the main heat exchanger (5), and then transported to the expander (6) to perform work and reheat again, and finally sent out from the first nitrogen outlet (2) for supply; S4. In addition, the oxygen-rich gas at the top of the upper distillation tower (8) is transferred to the upper distillation tower (8) to complete heat exchange, and high-purity nitrogen is obtained for supply again.

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