Oxygen recovery system for nitrogen production process

Abstract

An oxygen recovery system for a nitrogen making process comprises a nitrogen making machine, and an oxygen discharge pipe on the nitrogen making machine is connected with an emptying pipe and a recovery pipe through a three-way pipeline; the recovery pipe is connected with a silencing tank, and a second emptying pipe is arranged on the silencing tank; the silencing tank is in pipeline connection with the oxygen storage tank through the second recovery pipe; the oxygen storage tank is in pipeline connection with an oxygen fan through a third recovery pipe; a fourth recovery pipe is arranged on the oxygen fan; a first stop valve is arranged on the emptying pipe, a second stop valve is arranged on the second emptying pipe, and a third stop valve is arranged on the second recovery pipe. According to the utility model, the oxygen discharged by the nitrogen making machine can be recycled, conveyed and utilized, the recycled oxygen can be supplied to a combustion furnace and other equipment or devices utilizing combustion to generate heat energy, the combustion heat value is improved, the fuel is saved, and the operation cost is reduced. And the equipment has the advantages of stable operation, low operation cost and the like, and has important popularization and application values.

Description

Technical Field

[0001] The utility model relates to the field of [[ID=]], and particularly relates to an oxygen recovery system for nitrogen production process. Background Art

[0002] With the rapid development of industry, nitrogen has been widely used in the fields of chemical industry, electronics, metallurgy, food, machinery, etc. Pure nitrogen cannot be directly extracted from nature, and the air separation method is mainly adopted. For example, in the common PSA nitrogen generator process, molecular sieves are used to adsorb oxygen to reach equilibrium to obtain a continuous nitrogen stream. In the prior art, to produce 1 Nm³ of nitrogen, 3 Nm³ of air needs to be consumed, that is to say, about 2 Nm³ of oxygen will be desorbed. However, at present, the desorbed gas of the nitrogen generator, that is, oxygen, is disposed of by directly discharging it into the atmosphere, resulting in waste of production materials. In response to this situation, there is currently no corresponding solution. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a nitrogen production process oxygen recovery system with a simple structure, safe use, and capable of recycling the desorbed gas in the nitrogen production process.

[0004] The equipment includes a nitrogen generator, and the nitrogen generator draws external air through an intake mechanism, and a finished product discharge pipe is arranged on the nitrogen generator; the finished product discharge pipe is used to output nitrogen finished products;

[0005] An oxygen discharge pipe is also arranged on the nitrogen generator; the oxygen discharge pipe is connected to an exhaust pipe and a recovery pipe through a three-way pipe;

[0006] The recovery pipe is connected to a silencer, and a second exhaust pipe is arranged on the silencer;

[0007] The silencer is connected to an oxygen storage tank through a second recovery pipe; the oxygen storage tank is connected to an oxygen blower through a third recovery pipe; a fourth recovery pipe is arranged on the oxygen blower;

[0008] A first stop valve is arranged on the exhaust pipe, a second stop valve is arranged on the second exhaust pipe, and a third stop valve is arranged on the second recovery pipe.

[0009] The achieved effect is that in the non-oxygen recovery state, the first stop valve is opened, the second stop valve and the third stop valve are closed, and the normal operation of the nitrogen generator is not affected. In the oxygen recovery state, the first stop valve is closed, the second stop valve is closed, and the third stop valve is opened; oxygen can then pass through the check valve to the use position.

[0010] The beneficial effects of the present utility model are as follows: The present utility model can realize the recovery, transportation and utilization of the oxygen discharged by the nitrogen generator. The recovered oxygen can supply gas to other equipment or devices that utilize combustion to generate heat energy, such as a combustion furnace, improve the combustion calorific value, save fuel, and reduce the operating cost. Moreover, the equipment has the advantages of stable operation and low operating cost, and has important promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic structural diagram of an oxygen recovery system for a nitrogen production process according to the present utility model;

[0012] Reference numerals:

[0013] 1, intake mechanism; 2, nitrogen generator; 3, finished product discharge pipe; 4, evacuation pipe; 5, recovery pipe; 6, silencing tank; 7, second recovery pipe; 8, oxygen storage tank; 9, third recovery pipe; 10, oxygen blower; 11, fourth recovery pipe; 12 - control system

[0014] 2-1, first safety valve; 4-1, silencer; 5-1, first stop valve; 6-1, second safety valve; 6-2, second evacuation pipe; 6-3, second stop valve; 7-1 third stop valve; 8-1 third safety valve; 11-1, check valve

[0015] The realization, functional features and advantages of the object of the present utility model will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] Referring to Figure 1 , an oxygen recovery system for a nitrogen production process according to the present utility model includes a nitrogen generator 2. The nitrogen generator 2 draws external air through an intake mechanism 1, and a finished product discharge pipe 3 is provided on the nitrogen generator 2; the finished product discharge pipe 3 is used to output nitrogen finished products;

[0017] An oxygen discharge pipe is also provided on the nitrogen generator 2; the oxygen discharge pipe is connected to an evacuation pipe 4 and a recovery pipe 5 through a tee pipe;

[0018] The recovery pipe 5 is connected to a silencing tank 6, and a second evacuation pipe 6-2 is provided on the silencing tank 6;

[0019] The silencing tank 6 is connected to an oxygen storage tank 8 through a second recovery pipe 7; the oxygen storage tank 8 is connected to an oxygen blower 10 through a third recovery pipe 9; a fourth recovery pipe 11 is provided on the oxygen blower 10;

[0020] A first stop valve 5-1 is provided on the evacuation pipe 4, a second stop valve 6-3 is provided on the second evacuation pipe 6-2, and a third stop valve 7-1 is provided on the second recovery pipe 7.

[0021] Furthermore, a first safety valve 2-1 is provided on the nitrogen generator 2; a second safety valve 6-1 is provided on the silencer tank 6; and a third safety valve 8-1 is provided on the oxygen storage tank 8.

[0022] The effect achieved thereby is to ensure production safety.

[0023] Furthermore, a check valve 11-1 is provided on the fourth recovery pipe 11.

[0024] The effect achieved thereby is to prevent oxygen from flowing back.

[0025] Furthermore, a silencer 4-1 is provided at the end of the exhaust pipe 4.

[0026] The effect achieved thereby is to silence the exhausted air.

[0027] Furthermore, the first stop valve 5-1, the second stop valve 6-3 and the third stop valve 7-1 are all electrically controlled valves, and the first stop valve 5-1, the second stop valve 6-3 and the third stop valve 7-1 are signal-connected to the control system 12.

[0028] Preferably, the control system 12 is a DCS.

[0029] The effect achieved thereby is to replace manual control and start and stop the equipment through electrical control operations.

[0030] During use, in the non-oxygen recovery state, the first stop valve 5-1 is open, the second stop valve 6-3 and the third stop valve 7-1 are closed, and the nitrogen generator 2 does not affect normal operation. 0.8 mpa compressed air enters the nitrogen generator 2 through the intake mechanism 1, and nitrogen with a purity of ≥98% (0.6 mpa) is produced. The nitrogen is sent to the usage location through the finished product discharge pipe 3. 28-30% of the oxygen (0.6-0 mpa) released by the nitrogen generator 2 is discharged into the atmosphere through the exhaust pipe 4 and the silencer 4-1.

[0031] In the oxygen recovery state, the first stop valve 5-1 is closed, the second stop valve 6-3 is closed, and the third stop valve 7-1 is open; 28-30% of the oxygen (0.6-0 mpa) enters the silencer tank 6 through the recovery pipe 5, and then enters the oxygen storage tank 8 through the second recovery pipe 7 and the third stop valve 7-1;

[0032] The oxygen storage tank 8 is at normal pressure or slightly negative pressure. 28-30% of the oxygen in the oxygen storage tank 8 enters the oxygen blower 10 through the third recovery pipe 9, and after being pressurized to 0.05 mpa, it reaches the usage location through the fourth recovery pipe 11 and the check valve 11-1.

[0033] The above has shown and described the basic principles, main features and advantages of the present utility model. For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims.

[0034] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An oxygen recovery system for a nitrogen production process, comprising a nitrogen generator, on which a finished product discharge pipe is provided; an oxygen discharge pipe is also provided on the nitrogen generator; characterized in that: The described oxygen discharge pipe is connected to the evacuation pipe and the recovery pipe through a tee pipe; The described recovery pipe is connected to a silencing tank, and a second evacuation pipe is provided on the silencing tank; The described silencing tank is connected to an oxygen storage tank through a second recovery pipe; the oxygen storage tank is connected to an oxygen blower through a third recovery pipe; a fourth recovery pipe is provided on the oxygen blower; A first stop valve is provided on the evacuation pipe, a second stop valve is provided on the second evacuation pipe, and a third stop valve is provided on the second recovery pipe.

2. The oxygen recovery system for a nitrogen production process according to claim 1, wherein, A first safety valve is provided on the nitrogen generator; a second safety valve is provided on the silencing tank; a third safety valve is provided on the oxygen storage tank.

3. The oxygen recovery system for a nitrogen production process according to claim 1, wherein A check valve is provided on the fourth recovery pipe.

4. The oxygen recovery system for a nitrogen production process according to claim 1, characterized in that, A silencer is provided at the end of the evacuation pipe.

5. The oxygen recovery system for a nitrogen production process according to claim 1, wherein The first stop valve, the second stop valve and the third stop valve are all electrically controlled valves, and the first stop valve, the second stop valve and the third stop valve are signal-connected to a control system.

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