Zero-steam-consumption oxygen removal membrane system

Abstract

According to the technical scheme, the zero-steam-consumption oxygen removal membrane system is characterized in that the zero-steam-consumption oxygen removal membrane system comprises an oxygen removal membrane device, the oxygen removal membrane device is provided with a water inlet and a water outlet, the oxygen removal membrane device is provided with an air inlet and an air extraction opening, the air extraction opening is provided with an air extraction pump, the air inlet is provided with a nitrogen sweeping-in assembly, and the water outlet is communicated with a water storage tank. The water storage tank is provided with a water outlet valve and a nitrogen sealing assembly, so that the water is prevented from going bad due to contact with oxygen again, and the quality guarantee period of the deoxygenated water is prolonged.

Description

Technical Field

[0001] The utility model relates to the fields of oil refining and chemical engineering, and more specifically, to a zero-steam-consumption deoxygenation membrane system. Background Technique

[0002] Oxygen in water can cause oxygen corrosion to water pipelines. Seriously, it may even cause the pipe wall to perforate and leak. Therefore, it is necessary to deoxygenate the water. The traditional method is thermal deoxygenation, which is the main deoxygenation method in the industrial field. It requires a large amount of steam. Therefore, a large amount of exhausted steam will be discharged during thermal deoxygenation.

[0003] In order to solve the problem of high energy consumption during deoxygenation in the prior art, a zero-steam-consumption deoxygenation system has been developed. For example, in the patent application document with the authorization publication number CN214370118U and the authorization publication date of October 8, 2021, the patent name is a zero-steam-consumption deoxygenation system. Paragraphs [07-10] in its specification record that "the membrane deoxygenation device includes a plurality of membrane deoxygenators, each membrane deoxygenator includes a tube body, water inlets and outlets are respectively arranged at both ends of the tube body, and vacuum ports and / or blowing ports are respectively arranged on one side of the water inlets and outlets of the tube body, and hollow fiber membranes are arranged in the tube body; the heat control device includes: a heat exchange unit connected to the membrane deoxygenation device to provide heat for the deoxygenated water output by the membrane deoxygenation device; a control unit communicating with the heat exchange unit to control the heat exchange unit to keep the deoxygenated water output by the membrane deoxygenation device at a set temperature level". This zero-steam-consumption deoxygenation system uses a membrane deoxygenation device for deoxygenation. In the prior art, the deoxygenated water will be stored for subsequent use. However, the directly placed deoxygenated water is likely to come into contact with air and be oxidized again, resulting in the deterioration of the deoxygenated water. Content of the Utility Model

[0004] The purpose of the utility model is to provide a zero-steam-consumption deoxygenation membrane system, which can avoid the deterioration of water due to re-contact with oxygen and improve the quality guarantee period of the deoxygenated water.

[0005] The above technical purpose of the utility model is achieved through the following technical solutions:

[0006] A zero-steam-consumption deoxygenation membrane system includes a deoxygenation membrane device. The deoxygenation membrane device is provided with a water inlet and a water outlet, an air inlet and a suction port. A suction pump is provided at the suction port, a nitrogen scavenging component is provided at the air inlet, the water outlet is communicated with a storage tank, the storage tank is provided with a water outlet valve, and the storage tank is provided with a nitrogen sealing component.

[0007] Preferably, the nitrogen sealing component includes a nitrogen supply valve communicated with the top of the storage tank. The nitrogen supply valve is connected to a nitrogen cylinder. A breathing valve is installed on the top of the storage tank. A nitrogen discharge pipe is also installed on the top of the storage tank, and a nitrogen discharge valve is installed on the nitrogen discharge pipe.

[0008] Preferably, a plate heat exchanger for controlling the water temperature at the inlet of the deoxygenation membrane device to be above 15 degrees is connected upstream of the water inlet of the deoxygenation membrane device.

[0009] Preferably, the nitrogen scavenging assembly includes a first nitrogen pipe, the first nitrogen pipe is connected to a nitrogen cylinder, and the first nitrogen pipe is connected to the air inlet.

[0010] Preferably, a first three-way joint is installed at the air inlet; the first three-way joint is connected to the first nitrogen pipe; the first three-way joint is also connected to a second nitrogen pipe; a second three-way joint is installed on the nitrogen discharge pipe, and the second three-way joint is located downstream of the nitrogen discharge valve; one end of the second three-way joint communicates with a third nitrogen pipe, and one end of the second three-way joint is connected to a fourth nitrogen pipe; a first valve is installed on the first nitrogen pipe, a second valve is installed on the second nitrogen pipe, a third valve is installed on the third nitrogen pipe, and a fourth valve is installed on the fourth nitrogen pipe; the second nitrogen pipe and the third nitrogen pipe communicate with each other.

[0011] Preferably, an airbag for storing nitrogen is communicated between the second nitrogen pipe and the third nitrogen pipe.

[0012] Preferably, the first valve, the second valve, the third valve and the fourth valve are all electrically controlled valves; a limiting cylinder is sleeved outside the nitrogen storage airbag, and a delay switch for triggering a signal by bulging the airbag is arranged in the limiting cylinder, and the delay switch is electrically connected to the first valve, the second valve, the third valve and the fourth valve; when the airbag contacts the delay switch, the first valve closes, the second valve opens, the third valve closes, and the fourth valve opens; when the airbag separates from the delay switch for 1 unit time, the first valve opens, the second valve closes, the third valve opens, and the fourth valve closes.

[0013] Preferably, 1 unit time is 3 minutes.

[0014] Preferably, 1 unit time is 5 minutes.

[0015] Preferably, 1 unit time is 8 minutes.

[0016] In summary, the utility model has the following beneficial effects:

[0017] (1) In this design, a nitrogen sealing assembly is used to seal the deoxygenated water, preventing external oxygen from entering the water storage tank, which can avoid the deterioration of the water due to re-contact with oxygen and improve the quality guarantee period of the deoxygenated water.

[0018] (2) The plate heat exchanger is used to control the water temperature at the inlet. Since the water temperature is different, the solubility of oxygen in water will be different, which will in turn lead to different deoxygenation efficiencies. Generally, the higher the temperature, the easier it is to deoxygenate; however, in this design, the membrane deoxygenation method is adopted, and if the water temperature changes too much, the deoxygenation quality will fluctuate.

[0019] Especially in winter, the water temperature will be between 0°C and 10°C. The water temperature is too low, resulting in too low membrane deaeration efficiency of water and incomplete deaeration in water. This design adopts a plate type. The plate heat exchanger heats the water, and the preset temperature is above 15°C. Users can control the inlet water temperature at 20°C, 30°C, 40°C, etc. according to actual needs. Such a design ensures that the inlet water temperature will not be too low, thus achieving the purpose of controlling the water deaeration efficiency and ensuring the quality of deaerated water.

[0020] (3) The nitrogen gas in the nitrogen sealing system is high-quality pure nitrogen. When the water volume in the water storage tank increases, nitrogen gas will be freely discharged under the control of the nitrogen discharge valve. Nitrogen gas is a relatively safe gas, but direct discharge is rather wasteful. This design recovers part of the discharged nitrogen gas and then uses it for nitrogen purging in membrane deaeration to improve the utilization efficiency of nitrogen gas.

[0021] (4) This design uses an airbag to collect the discharged nitrogen gas and then uniformly transports it to the nitrogen sweeping component, which can improve the transportation efficiency of the discharged nitrogen gas.

[0022] When the airbag expands to contact the delay switch, the internal air pressure is less than the restraint pressure value of the nitrogen discharge valve. Brief Description of the Drawings

[0023] Figure 1 is the system schematic diagram in Embodiment 1;

[0024] Figure 2 is the system schematic diagram when the airbag is deflated in Embodiment 2;

[0025] Figure 3 is the system schematic diagram when the airbag triggers the delay switch in Embodiment 2.

[0026] In the figure:

[0027] 1. Deaeration membrane device; 11. Air inlet; 12. Air extraction port;

[0028] 2. Air extraction pump;

[0029] 31. Screw pump; 32. Nitrogen cylinder;

[0030] 4. Water storage tank; 41. Water outlet valve;

[0031] 51. Nitrogen supply valve; 52. Breather valve; 53. Nitrogen discharge valve; 54. Nitrogen discharge pipe;

[0032] 6. Plate heat exchanger;

[0033] 71. First three-way joint; 72. Second three-way joint;

[0034] 81. First nitrogen pipe; 82. Second nitrogen pipe; 83. Third nitrogen pipe; 84. Fourth nitrogen pipe;

[0035] 91. First valve; 92. Second valve; 93. Third valve; 94. Fourth valve;

[0036] 101. Airbag; 102. Limit cylinder; 103. Delay switch. Detailed implementation mode

[0037] The present utility model will be further described in detail below with reference to the accompanying drawings.

[0038] Example 1, a zero-steam-consumption deoxygenation membrane system, refer to Figure 1 , including a deoxygenation membrane device 1. The deoxygenation membrane device 1 is a prior art. The deoxygenation membrane device 1 internally includes a membrane deaerator. A hollow fiber membrane is provided in the membrane deaerator. The water inlet and the water outlet are communicated with the membrane deaerator, and the air inlet 11 and the air extraction port 12 are communicated with the membrane deaerator; the number of membrane deaerators can be multiple, such as 2, 3, 4, 5, etc., and the user arranges the number as needed.

[0039] An air extraction pump 2 is provided at the air extraction port 12, and the air extraction pump 2 evacuates the deoxygenation membrane device 1.

[0040] The water outlet is communicated with a water storage tank 4. The water storage tank 4 is provided with a water outlet valve 41. When deoxygenated water needs to be used, the water outlet valve 41 can be opened to drain water;

[0041] The water storage tank 4 is provided with a nitrogen sealing assembly. The nitrogen sealing assembly includes a nitrogen supply valve 51 communicated with the top of the water storage tank 4. The nitrogen supply valve 51 is connected to a nitrogen gas cylinder 32 through a pipeline;

[0042] A nitrogen discharge pipe 54 is further installed on the top of the water storage tank 4. A nitrogen discharge valve 53 is installed on the nitrogen discharge pipe 54; the nitrogen discharge valve 53 is used to prevent the pressure in the nitrogen sealing system from being too high and will automatically open when the pressure in the system exceeds the set pressure value;

[0043] A breathing valve 52 is installed on the top of the water storage tank 4; the breathing valve 52 belongs to a protection device. When the nitrogen supply valve 51 and the nitrogen discharge valve 53 fail and it is difficult to maintain a stable pressure in the water storage tank 4, the breathing valve 52 maintains the pressure in the water storage tank 4 within a safe range.

[0044] The nitrogen sealing assembly can prevent the internal water from being oxidized due to the presence of oxygen.

[0045] A nitrogen gas sweeping-in assembly is provided at the air inlet 11. The nitrogen gas sweeping-in assembly includes a first nitrogen gas pipe 81. The first nitrogen gas pipe 81 is communicated with the nitrogen gas cylinder 32. The first nitrogen gas pipe 81 is connected to the air inlet 11. A screw pump 31 is installed at the air inlet 11. The screw pump 31 is used to increase the nitrogen gas supply.

[0046] Upstream of the water inlet of the deoxygenation membrane device 1, there is a plate heat exchanger 6 for controlling the water temperature at the water inlet above 15 degrees. The plate heat exchanger 6 exchanges heat between refrigerant and water to heat or cool the water, so that the water is controlled within a preset temperature range. In this embodiment, the water temperature is controlled at 26 degrees.

[0047] Embodiment 2, a zero-steam-consumption deoxygenation membrane system, which is different from Embodiment 1, referring to Figure 2 and Figure 3 , a first three-way joint 71 is installed at the air inlet 11. The first three-way joint 71 is connected to a first nitrogen pipe 81, and the first three-way joint 71 is also connected to a second nitrogen pipe 82;

[0048] The screw pump 31 is installed at the air inlet 11 and can suck nitrogen from the first nitrogen pipe 81 and the second nitrogen pipe 82 and inject the nitrogen into the air inlet 11.

[0049] A second three-way joint 72 is installed on the nitrogen discharge pipe 54. The second three-way joint 72 is located downstream of the nitrogen discharge valve 53. One end of the second three-way joint 72 is connected to a third nitrogen pipe 83, and one end of the second three-way joint 72 is connected to a fourth nitrogen pipe 84; a first valve 91 is installed on the first nitrogen pipe 81, a second valve 92 is installed on the second nitrogen pipe 82, a third valve 93 is installed on the third nitrogen pipe 83, and a fourth valve 94 is installed on the fourth nitrogen pipe 84; the second nitrogen pipe 82 and the third nitrogen pipe 83 are connected.

[0050] A gas bag 101 for storing nitrogen is connected between the second nitrogen pipe 82 and the third nitrogen pipe 83.

[0051] The first valve 91, the second valve 92, the third valve 93 and the fourth valve 94 are all electrically controlled valves; a limiting cylinder 102 is sleeved outside the nitrogen storage gas bag 101, and a delay switch 103 for triggering a signal by bulging the gas bag 101 is arranged in the limiting cylinder 102. The delay switch 103 is electrically connected to the first valve 91, the second valve 92, the third valve 93 and the fourth valve 94;

[0052] When the gas bag 101 contacts the delay switch 103, the first valve 91 closes, the second valve 92 opens, the third valve 93 closes, and the fourth valve 94 opens; when 1 unit time has passed after the gas bag 101 separates from the delay switch 103, the first valve 91 opens, the second valve 92 closes, the third valve 93 opens, and the fourth valve 94 closes.

[0053] The working principle is that when the gas bag 101 is deflated and the delay switch 103 is not activated, it is in the gas storage state. In this state, the first valve 91 opens, the second valve 92 closes, the third valve 93 opens, and the fourth valve 94 closes.

[0054] The nitrogen of the nitrogen discharge valve 53 will be stored in the gas bag 101 and cause the gas bag 101 to expand. The gas bag 101 can be a rubber bag;

[0055] When the airbag 101 expands to contact the delay switch 103, the delay switch 103 sends an electrical signal to the first valve 91, the second valve 92, the third valve 93, and the fourth valve 94. Then the first valve 91 closes, the second valve 92 opens, the third valve 93 closes, and the fourth valve 94 opens. When the airbag 101 expands to contact the delay switch 103, the internal pressure is less than the pressure relief pressure of the nitrogen release valve 53.

[0056] When the airbag 101 expands and deflates, it will deflate. One unit time after the delay switch 103 separates from the expanded airbag 101, that is, 3 minutes later, the first valve 91, the second valve 92, the third valve 93, and the fourth valve 94 return to the gas storage state. That is, the first valve 91 opens, the second valve 92 closes, the third valve 93 opens, and the fourth valve 94 closes; One unit time is the time period for the airbag 101 to continuously release nitrogen. Once the time period ends, it returns to the gas storage state.

[0057] The delay switch 103 is a relatively existing tactile switch device, and its function of delaying the sending of electrical signals can be achieved by using a time relay.

[0058] The first valve 91, the second valve 92, the third valve 93, and the fourth valve 94 can also be manually controlled.

[0059] In other embodiments, one unit time is 5 minutes or one unit time is 8 minutes.

[0060] The above are only the preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements should also be regarded as within the protection scope of the present invention.

Claims

1. A zero-steam-consumption deoxygenation membrane system, comprising a deoxygenation membrane device (1), the deoxygenation membrane device (1) being provided with a water inlet and a water outlet, the deoxygenation membrane device (1) being provided with an air inlet (11) and an air extraction port (12), an air extraction pump (2) being provided at the air extraction port (12), and a nitrogen scavenging assembly being provided at the air inlet (11), characterized in that: The water outlet is connected to a water storage tank (4). The water storage tank (4) is provided with a water outlet valve (41) and a nitrogen sealing assembly.

2. The zero steam consumption deoxygenation membrane system according to claim 1, characterized in that: The nitrogen sealing assembly includes a nitrogen supply valve (51) connected to the top of the water storage tank (4). The nitrogen supply valve (51) is connected to a nitrogen cylinder (32). A breather valve (52) is installed on the top of the water storage tank (4). A nitrogen discharge pipe (54) is also installed on the top of the water storage tank (4), and a nitrogen discharge valve (53) is installed on the nitrogen discharge pipe (54).

3. A zero-steam-consumption deoxygenation membrane system according to claim 2, characterized in that: Upstream of the water inlet of the deoxygenation membrane device (1), a plate heat exchanger (6) for controlling the water temperature at the water inlet above 15 degrees is connected.

4. A zero-steam-consumption deoxygenation membrane system according to claim 2, characterized in that: The nitrogen scavenging assembly includes a first nitrogen pipe (81). The first nitrogen pipe (81) is connected to the nitrogen cylinder (32), and the first nitrogen pipe (81) is connected to the air inlet (11).

5. A zero-steam-consumption deoxygenation membrane system according to claim 4, characterized in that: A first three-way joint (71) is installed at the air inlet (11); The first three-way joint (71) is connected to the first nitrogen pipe (81); The first three-way joint (71) is also connected to a second nitrogen pipe (82); A second three-way joint (72) is installed on the nitrogen discharge pipe (54). The second three-way joint (72) is located downstream of the nitrogen discharge valve (53); One end of the second three-way joint (72) is connected to a third nitrogen pipe (83), and one end of the second three-way joint (72) is connected to a fourth nitrogen pipe (84); A first valve (91) is installed on the first nitrogen pipe (81), a second valve (92) is installed on the second nitrogen pipe (82), a third valve (93) is installed on the third nitrogen pipe (83), and a fourth valve (94) is installed on the fourth nitrogen pipe (84); The second nitrogen pipe (82) is connected to the third nitrogen pipe (83).

6. A zero-steam-consumption deoxygenation membrane system according to claim 5, characterized in that: An airbag (101) for storing nitrogen is connected between the second nitrogen pipe (82) and the third nitrogen pipe (83).

7. A zero-steam-consumption deoxygenation membrane system according to claim 6, characterized in that: The first valve (91), the second valve (92), the third valve (93), and the fourth valve (94) are all electrically controlled valves; An outer sleeve of the nitrogen storage airbag (101) is provided with a limit cylinder (102). A delay switch (103) for triggering a signal by inflating the airbag (101) is arranged in the limit cylinder (102). The delay switch (103) is electrically connected to the first valve (91), the second valve (92), the third valve (93), and the fourth valve (94); When the airbag (101) contacts the delay switch (103), the first valve (91) closes, the second valve (92) opens, the third valve (93) closes, and the fourth valve (94) opens; After 1 unit time when the airbag (101) separates from the delay switch (103), the first valve (91) opens, the second valve (92) closes, the third valve (93) opens, and the fourth valve (94) closes.

8. A zero-steam-consumption deoxygenation membrane system according to claim 7, characterized in that: 1 unit time is 3 minutes.

9. A zero-steam-consumption deoxygenation membrane system according to claim 7, characterized in that: 1 unit time is 5 minutes.

10. A zero-steam-consumption deoxygenation membrane system according to claim 7, characterized in that: 1 unit time is 8 minutes.

Images