Oxygen supply system with oxygen storage and pressure balance for connecting with vpsa oxygen generation system

Abstract

The utility model discloses a kind of oxygen compression buffer balanced oxygen supply system connected with VPSA oxygen production system, belong to oxygen supply system technical field. Including: buffer tank, first storage tank to third storage tank, first oxygen compressor to fourth oxygen compressor, first stop valve to sixth stop valve, self-operated pressure regulating valve, PID pneumatic regulating valve and oxygen supply pipeline. The utility model sets fourth oxygen compressor, second storage tank and third storage tank combination use, when VPSA oxygen production system oxygen surplus oxygen to be emptied is compressed, storage, when deficient, supplement to oxygen supply pipeline supply user, reduce oxygen emptying volume, reach the purpose of balanced oxygen supply. The utility model realizes oxygen storage regulation oxygen in oxygen peak period, trough period, avoid product oxygen emptying waste, can all be recycled oxygen to be emptied, and according to specific production condition, by oxygen production system regulation to each furnace kiln use, under the condition that oxygen is sufficient, can better stabilize each furnace kiln working condition.

Description

Technical Field

[0001] This utility model belongs to the field of oxygen supply system technology, and relates to a pressure oxygen buffer balance oxygen supply system connected to a VPSA oxygen generation system. Background Technology

[0002] VPSA oxygen generation technology, with its high efficiency and energy saving, has been widely used in various fields such as chemical engineering, medical treatment, and metal cutting. This process achieves the separation and enrichment of oxygen in the air by periodically changing the pressure of the adsorption bed.

[0003] Existing oxygen stations use pressure swing adsorption (VPSA-O2) technology, which uses a blower to pressurize air and send it into the adsorption tower. N2 and other gases are preferentially adsorbed by the molecular sieves inside the tower, while O2 is enriched at the top of the tower and output as a product. When the molecular sieves are saturated, a vacuum pump is used to evacuate the N2 and other waste gases from the adsorption tower, restoring the adsorption capacity of the molecular sieve bed. Through the cyclic operation of two adsorption towers, continuous output of product oxygen is achieved.

[0004] Because the oxygen station produces 6500 Nm³ of oxygen. 3 The current oxygen yield is insufficient; during maintenance, the molecular sieve is activated. The actual oxygen production of the current technology is 7300 Nm³. 3 / h, the peak oxygen demand of users is expected to be 13500m in the future. 3 / h.

[0005] Existing oxygen stations lack production regulation and storage buffer oxygen supply functions. During the smelting process of metallurgical furnaces, the oxygen consumption is cyclical, with large amounts during the smelting stage and small amounts during the reduction and discharge stages. During the low oxygen consumption stage of metallurgical furnaces, a large amount of excess oxygen is discharged from the oxygen station (the daily average discharge rate reaches 35%), which not only causes waste but also generates a lot of noise.

[0006] Oxygen consumption varies across different metallurgical furnaces and kilns at different times, and the total oxygen consumption of all metallurgical furnaces and kilns is also uneven. During some periods, the oxygen consumption is lower than the oxygen station's output, resulting in an oxygen surplus; during other periods, the oxygen consumption is higher than the oxygen station's output, resulting in an oxygen shortage. Statistics show that the cumulative daily oxygen surplus time is 12.7 hours, and the oxygen shortage time is 11.3 hours, with a daily oxygen surplus of 49728 Nm³. 3 Oxygen supply deficit: 32335 Nm 3 The surplus exceeds the deficit.

[0007] Therefore, how to develop a pressure oxygen buffer balance oxygen supply system that connects to a VPSA oxygen generation system is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0008] In view of this, the present invention provides a pressure oxygen buffer balance oxygen supply system connected to a VPSA oxygen generation system.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A pressure oxygen buffer balance oxygen supply system connected to a VPSA oxygen generation system includes: a buffer tank, a first to a third storage tank, a first to a fourth oxygen compressor, a first to a sixth shut-off valve, a self-regulating pressure regulating valve, a PID pneumatic regulating valve, and an oxygen supply pipeline.

[0011] The inlets of the first, second, and third oxygen compressors are connected in parallel and then connected to the outlet of the first storage tank via a pipeline. The outlets of the first, second, and third oxygen compressors are connected in parallel and then connected to the inlet of the buffer tank via a pipeline. The outlet of the buffer tank, the first shut-off valve, and the oxygen supply pipeline are connected sequentially via pipelines.

[0012] The outlet of the buffer tank, the second shut-off valve, the fifth shut-off valve, the fourth oxygen compressor, the sixth shut-off valve, the second storage tank, the self-regulating pressure regulating valve, the PID pneumatic regulating valve, the third storage tank, the fourth shut-off valve, and the oxygen supply pipeline are connected in sequence via pipelines.

[0013] The second shut-off valve, the third shut-off valve, and the third storage tank are connected in sequence via pipelines.

[0014] Furthermore, the volume of the first storage tank is 100m³. 3 The gas supply pressure is 0.2 MPa, and the volume of the buffer tank is 100 m³. 3 The gas supply pressure is 0.2 MPa, and the volume of the second storage tank is 1000 m³. 3 The gas supply pressure is 1.5 MPa, and the volume of the third storage tank is 100 m³. 3 The gas supply pressure is 0.2 MPa.

[0015] The beneficial effects of adopting the above-mentioned further technical solution are as follows: After pressurization, the second storage tank can store up to 15,000 m³ of oxygen. 3 .

[0016] Furthermore, the discharge capacity of each of the first to third oxygen compressors is 5040 Nm. 3 The fourth oxygen compressor has a discharge capacity of 2600 Nm³ / h, a discharge pressure of 0.35 MPa, a motor power of 400 kW, and is a variable frequency oxygen compressor. 3 / h, exhaust pressure 1.5MPa, motor power is 280kW.

[0017] The beneficial effects of adopting the above-mentioned further technical solution are as follows: The fourth oxygen compressor adopts a variable frequency oxygen compressor, and the intake volume of the fourth oxygen compressor is controlled according to the amount of oxygen discharged, thus avoiding the waste of active power consumption of the fourth oxygen compressor.

[0018] Furthermore, two of the first to third oxygen compressors are turned on and one is on standby.

[0019] The beneficial effects of this utility model are:

[0020] This invention features a PID pneumatic regulating valve, which adjusts the valve opening based on the oxygen usage at the downstream end, thereby achieving automatic adjustment of the amount of oxygen delivered based on the oxygen demand.

[0021] This invention includes a third storage tank for stabilizing the output of oxygen after depressurization in the second storage tank, thus avoiding impact on the VPSA oxygen generation system.

[0022] This invention employs a combination of a fourth oxygen compressor, a second storage tank, and a third storage tank. When the VPSA oxygen production system has a surplus of oxygen, the vented oxygen is compressed and stored; when oxygen is scarce, it is replenished to the oxygen pipeline to supply users, reducing the amount of oxygen vented and achieving a balanced oxygen supply. This invention enables oxygen storage and regulation during peak and off-peak periods, avoiding the waste of vented oxygen. Simultaneously, all currently vented oxygen can be recovered and regulated for use in various furnaces and kilns according to specific production conditions. Under sufficient oxygen conditions, it can also better stabilize the operating conditions of each furnace and kiln.

[0023] The renovation solved the problem of wasting 35% of the product oxygen in the VPSA oxygen generation system, saving costs. It is estimated that this will save 4.2 million yuan per year, which is beneficial for the company to save energy and reduce costs. On the other hand, it solved the problem of insufficient product oxygen during peak oxygen demand periods, avoiding the impact of "oxygen grabbing" and fluctuations in oxygen supply pressure on users and the VPSA oxygen generation system.

[0024] This invention is the first of its kind in the industry, with advanced technology and mature processes. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1This is a schematic diagram of the oxygen pressure buffer balance oxygen supply system connected to the VPSA oxygen generation system of this utility model.

[0027] Among them, 1-buffer tank, 2-first storage tank, 3-second storage tank, 4-third storage tank, 5-first oxygen compressor, 6-second oxygen compressor, 7-third oxygen compressor, 8-fourth oxygen compressor, 9-first shut-off valve, 10-second shut-off valve, 11-third shut-off valve, 12-fourth shut-off valve, 13-fifth shut-off valve, 14-sixth shut-off valve, 15-self-operated pressure regulating valve, 16-PID pneumatic regulating valve, 17-oxygen supply pipeline. Detailed Implementation

[0028] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] The oxygen buffer balance oxygen supply system connected to the VPSA oxygen generation system includes: buffer tank 1, first storage tank 2 to third storage tank 4, first oxygen compressor 5 to fourth oxygen compressor 8, first shut-off valve 9 to sixth shut-off valve 14, self-regulating pressure regulating valve 15, PID pneumatic regulating valve 16 and oxygen supply pipeline 17.

[0030] Among them, the inlets of the first oxygen compressor 5, the second oxygen compressor 6 and the third oxygen compressor 7 are connected in parallel and then connected to the outlet of the first storage tank 2 via pipelines. The outlets of the first oxygen compressor 5, the second oxygen compressor 6 and the third oxygen compressor 7 are connected in parallel and then connected to the inlet of the buffer tank 1 via pipelines. The outlet of the buffer tank 1, the first shut-off valve 9 and the oxygen supply pipeline 17 are connected in sequence via pipelines.

[0031] The outlet of buffer tank 1, the second shut-off valve 10, the fifth shut-off valve 13, the fourth oxygen compressor 8, the sixth shut-off valve 14, the second storage tank 3, the self-regulating pressure regulating valve 15, the PID pneumatic regulating valve 16, the third storage tank 4, the fourth shut-off valve 12 and the oxygen supply pipeline 17 are connected in sequence via pipelines.

[0032] The second shut-off valve 10, the third shut-off valve 11, and the third storage tank 4 are connected in sequence via pipelines.

[0033] In one embodiment, the volume of the first storage tank 2 is 100m³. 3 The gas supply pressure is 0.2 MPa, and the volume of buffer tank 1 is 100 m³. 3 The gas supply pressure is 0.2 MPa, and the volume of the second storage tank 3 is 1000 m³. 3The gas supply pressure is 1.5 MPa, and the volume of the third storage tank 4 is 100 m³. 3 The gas supply pressure is 0.2 MPa.

[0034] In one embodiment, the discharge capacity of each of the first oxygen compressor 5 to the third oxygen compressor 7 is 5040 Nm. 3 The fourth oxygen compressor, 8, is a variable frequency oxygen compressor with a discharge capacity of 2600 Nm³ / h, an exhaust pressure of 0.35 MPa, a motor power of 400 kW, and an exhaust volume of 2600 Nm³ / h. 3 / h, exhaust pressure 1.5MPa, motor power is 280kW.

[0035] In one embodiment, two of the first oxygen compressor 5 to the third oxygen compressor 7 are turned on and one is on standby.

[0036] The method for pressure-buffered oxygen supply in connection with a VPSA oxygen generation system includes the following steps:

[0037] This invention relates to a pressure oxygen buffer and balanced oxygen supply system that connects to a VPSA oxygen generation system.

[0038] Route 1:

[0039] When the oxygen production of the VPSA oxygen generator is less than or equal to the user's oxygen consumption, the first shut-off valve 9 is closed, the fifth shut-off valve 13 is closed, the sixth shut-off valve 14 is closed, the second shut-off valve 10 is opened, the third shut-off valve 11 is opened, and the fourth shut-off valve 12 is opened. The product oxygen from the VPSA oxygen generator passes through the first storage tank 2, the parallel first oxygen compressor 5, the second oxygen compressor 6, and the third oxygen compressor 7 to be depressurized to the buffer tank 1 and the third storage tank 4, and is directly supplied to the user. When the pressure of the third storage tank 4 drops below 0.2 MPa, the second storage tank 3 is depressurized to 0.2 MPa through the self-regulating pressure regulating valve 15, and then oxygen is supplemented to the third storage tank 4 through the PID pneumatic regulating valve 16 to control the oxygen supply pressure of the third storage tank 4 to be balanced and stable.

[0040] When the oxygen production of the VPSA oxygen generation system exceeds the user's oxygen consumption, the first shut-off valve 9 is closed, the second shut-off valve 10 is opened, the third shut-off valve 11 is opened, the fourth shut-off valve 12 is opened, the fifth shut-off valve 13 is opened, and the sixth shut-off valve 14 is opened. The product oxygen from the VPSA oxygen generation system passes through the first storage tank 2, the first oxygen compressor 5 connected in parallel, the second oxygen compressor 6 and the third oxygen compressor 7, and is depressurized to 0.2 MPa and stored in the buffer tank 1. Most of the oxygen is supplied to the third storage tank 4 directly to the user, and the remaining oxygen is compressed to 1.5 MPa by the fourth oxygen compressor and then stored in the second storage tank 3.

[0041] Route 2:

[0042] When the fourth oxygen compressor or the pipeline of line one is under maintenance, the second shut-off valve 10 is closed, the fourth shut-off valve 12 is closed, and the first shut-off valve 9 is opened. The product oxygen from the VPSA oxygen generation system passes through the first storage tank 2, the first oxygen compressor 5 connected in parallel, the second oxygen compressor 6 and the third oxygen compressor 7, and is depressurized to 0.2 MPa. It is then stored in the buffer tank 1 and directly supplied to the user.

[0043] According to statistics, with the increase in output and technological changes in various metallurgical kilns, the oxygen demand of these kilns will reach 13,500 Nm³. 3 / h(top blown furnace 7500Nm) 3 / h, the two fuming furnaces together provide 4000 Nm 3 / h, fluidized bed roasting furnace 1000Nm 3 / h, ozone denitrification 1000Nm 3 / h), the current oxygen production station output is 7300Nm 3 / h, gap 6200 Nm 3 / h. Statistics show that the current period with the highest oxygen surplus is 4875 Nm³. 3 Based on industry design standards and considerations for oxygen supply balance, a spherical tank with a volume of 1000 m³ / h is selected for oxygen storage. 3 .

[0044] The current oxygen station's VPSA-O2 oxygen production system has a designed output of 7500 Nm³. 3 / h, oxygen compressor parameters: exhaust volume is 5040Nm 3 / h, exhaust pressure 0.35MPa, matching motor power 400kW, to prevent a decrease in exhaust volume from the first to the third oxygen compressor, so that a single unit cannot reach 5040Nm 3 / h, select to simultaneously start two of the oxygen compressors, from the first to the third.

[0045] After the system is completed, Line 1 and Line 2 can operate independently without affecting each other. It can store and regulate oxygen during peak and off-peak periods, avoiding the waste of oxygen released from production facilities. Simultaneously, all currently vented oxygen can be recovered and distributed to each furnace / kiln according to specific production conditions via the oxygen production system. Under sufficient oxygen conditions, it can also better stabilize the operating conditions of each furnace / kiln.

[0046] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any modifications and substitutions based on the technical solutions and utility model concepts provided by the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A pressure oxygen buffer and balanced oxygen supply system connected to a VPSA oxygen generation system, characterized in that, include: Buffer tank, first to third storage tanks, first to fourth oxygen compressors, first to sixth shut-off valves, self-regulating pressure regulating valve, PID pneumatic regulating valve and oxygen supply pipeline; The inlets of the first, second, and third oxygen compressors are connected in parallel and then connected to the outlet of the first storage tank via a pipeline. The outlets of the first, second, and third oxygen compressors are connected in parallel and then connected to the inlet of the buffer tank via a pipeline. The outlet of the buffer tank, the first shut-off valve, and the oxygen supply pipeline are connected sequentially via pipelines. The outlet of the buffer tank, the second shut-off valve, the fifth shut-off valve, the fourth oxygen compressor, the sixth shut-off valve, the second storage tank, the self-regulating pressure regulating valve, the PID pneumatic regulating valve, the third storage tank, the fourth shut-off valve, and the oxygen supply pipeline are connected in sequence via pipelines. The second shut-off valve, the third shut-off valve, and the third storage tank are connected in sequence via pipelines.

2. The oxygen pressure buffer and balancing oxygen supply system connected to a VPSA oxygen generation system according to claim 1, characterized in that, The volume of the first storage tank is 100m³. 3 The gas supply pressure is 0.2 MPa, and the volume of the buffer tank is 100 m³. 3 The gas supply pressure is 0.2 MPa, and the volume of the second storage tank is 1000 m³. 3 The gas supply pressure is 1.5 MPa, and the volume of the third storage tank is 100 m³. 3 The gas supply pressure is 0.2 MPa.

3. The oxygen pressure buffer and balancing oxygen supply system connected to a VPSA oxygen generation system according to claim 1, characterized in that, The discharge capacity of each of the first to third oxygen compressors is 5040 Nm. 3 The fourth oxygen compressor has a discharge capacity of 2600 Nm³ / h, a discharge pressure of 0.35 MPa, a motor power of 400 kW, and is a variable frequency oxygen compressor. 3 / h, exhaust pressure 1.5MPa, motor power is 280kW.

4. The oxygen pressure buffer and balancing oxygen supply system connected to a VPSA oxygen generation system according to claim 1, characterized in that, Of the first to the third oxygen compressors, two are turned on and one is on standby.

Images