Air leakage monitoring device for heat exchanger

Abstract

The invention relates to an air leakage monitoring device, in particular to an air leakage monitoring device for a heat exchanger. The problem that in the prior art, leakage from the air side to the water side of a heat exchanger is not found in time, so that the maintenance time and the maintenance cost of a power station are greatly increased is solved. The device is simple in structure, the online oxygen concentration analyzer is installed on the oxygen concentration analysis tank, and leakage from the air side to the water side of the heat exchanger is indirectly reflected through change of monitoring numerical values of the online oxygen concentration analyzer. Leakage from the air side to the water side of the heat exchanger is found and alarmed at the beginning, so that the maintenance time and the maintenance cost can be greatly reduced. Water is sequentially baffled after entering the oxygen concentration analysis tank from the sampling inlet, so that the contact area between the water and nitrogen in the gas cavity is increased, the separation of dissolved oxygen is accelerated, and the problem that the dissolved oxygen possibly cannot overflow more when the water flows through the gas cavity is solved. The invention belongs to the technical field of heat exchanger monitoring equipment.

Description

Technical Field

[0001] The invention relates to an air leakage monitoring device, in particular to an air leakage monitoring device for a heat exchanger, and belongs to the technical field of heat exchanger monitoring equipment. Background Art

[0002] Compressed air energy storage power stations are important facilities that respond to new energy systems. Their high efficiency, long operating life, mature technology and low construction costs give them certain advantages in the field of energy storage technology.

[0003] The heat exchanger is the core equipment of the heat exchange system of the compressed air energy storage power station. It is usually a shell and tube heat exchanger with air on one side and water or molten salt on the other side. For the steam-water heat exchanger, the water side is mostly closed and nitrogen-sealed. Although the slight leakage from the air side to the water side will not cause changes in process parameters or short-term normal operation, the leakage will cause the oxygen on the water side to gradually accumulate, thereby increasing the oxygen concentration, aggravating the corrosion rate of the entire system, and causing safety hazards to the system. The system has been operating under this leakage for a long time, and the power station operators may not discover the problem until the corrosion causes obvious leakage. At that time, the power station may face comprehensive overhaul of multiple equipment or pipelines, and cause considerable economic losses from overhaul and shutdown.

[0004] In summary, how to propose an air leakage monitoring device to address the above technical issues has become an urgent problem to be solved by technicians in this field. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides an air leakage monitoring device for a heat exchanger.

[0006] The technical solution of the present invention is: an air leakage monitoring device for a heat exchanger, comprising an oxygen concentration analysis tank.

[0007] The oxygen concentration analysis tank comprises an upper head, a cylinder and a lower head.

[0008] The upper head and the lower head are coaxially fixed to the two ends of the cylinder respectively. An online oxygen concentration analyzer is installed on the upper head, and a nitrogen inlet and a sampling inlet are opened on the upper head, and a sampling outlet is opened on the lower head.

[0009] A magnetic flap liquid level gauge is installed on the outer circumferential surface of the cylinder, and an air space connecting pipe, a plurality of vertical plates, a plurality of conical plates and a plurality of inverted conical buckets are arranged inside the cylinder.

[0010] A plurality of vertical plates are fixedly connected to the inner wall of the cylinder in a circular array.

[0011] The conical plates and the inverted conical buckets (10-5) are arranged alternately, and both the conical plates and the inverted conical buckets are mounted on the vertical plates.

[0012] The apex of the conical plate faces the upper head, and the small end opening of the inverted conical bucket faces the lower head.

[0013] The air space connecting pipe is provided with a plurality of vent holes, the axis of the air space connecting pipe is parallel to the axis of the cylinder, the air space connecting pipe passes through the conical plate and the inverted conical bucket in sequence, and the conical plate and the inverted conical bucket are both fixedly connected to the air space connecting pipe.

[0014] Furthermore, an anti-vortex baffle is installed on the lower head, and the anti-vortex baffle is coaxially arranged with the sampling outlet.

[0015] Compared with the prior art, the present invention has the following effects:

[0016] 1. The present invention has a simple structure. An online oxygen concentration analyzer 1 is installed on the oxygen concentration analysis tank 10. The change in the monitoring value of the online oxygen concentration analyzer 1 indirectly reflects the leakage from the air side to the water side of the heat exchanger. The leakage from the air side to the water side of the heat exchanger is discovered and an alarm is issued at the beginning, which can greatly reduce the maintenance time and maintenance cost, and indirectly improve the economy and stability of the power station.

[0017] 2. The conical plates 10-4 and the inverted conical buckets 10-5 of the present invention are arranged alternately, so that water enters the oxygen concentration analysis tank 10 from the sampling inlet 10-12 and then deflects in sequence, which is beneficial to increase the contact area between water and nitrogen in the gas cavity, accelerates the separation of dissolved oxygen, and avoids the problem that dissolved oxygen may not overflow when water flows through the gas cavity.

[0018] 3. The present invention installs an anti-vortex baffle 10-9 on the lower head 10-7, which can prevent water from bringing out gas when flowing in the oxygen concentration analysis tank 10, and avoid frequent replenishment of nitrogen into the oxygen concentration analysis tank 10. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a cross-sectional view of the oxygen concentration analysis tank 10;

[0020] Figure 2 It is a schematic diagram of the oxygen concentration analysis tank 10 when in use.

[0021] In the figure: 1. Online oxygen concentration analyzer; 3. Main pipeline; 5. Upstream heat exchanger; 6. Downstream heat exchanger; 9. Magnetic flap level gauge; 10. Oxygen concentration analysis tank; 10-2. Upper head; 10-3. Air space connecting pipe; 10-4. Conical plate; 10-5. Inverted cone bucket; 10-6. Cylinder; 10-7. Lower head; 10-8. Sampling outlet; 10-9. Anti-vortex baffle; 10-10. Vertical plate; 10-11. Nitrogen inlet; 10-12. Sampling inlet; 11. Nitrogen source. DETAILED DESCRIPTION

[0022] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0023] Specific implementation method 1: Combination Figures 1 to 2 The present embodiment is described below. An air leakage monitoring device for a heat exchanger according to the present embodiment includes an oxygen concentration analysis tank 10 .

[0024] The oxygen concentration analysis tank 10 includes an upper head 10-2, a cylinder 10-6 and a lower head 10-7.

[0025] The upper head 10-2 and the lower head 10-7 are coaxially fixed to the two ends of the cylinder 10-6, and an online oxygen concentration analyzer 1 is installed on the upper head 10-2. Preferably, the online oxygen concentration analyzer 1 uses the GPro500 oxygen analyzer model of Mettler-Toledo. With this configuration, the leakage from the air side to the water side of the heat exchanger is indirectly reflected by the change in the monitoring value of the online oxygen concentration analyzer 1.

[0026] A nitrogen inlet 10-11 and a sampling inlet 10-12 are provided on the upper head 10-2, and a sampling outlet 10-8 is provided on the lower head 10-7.

[0027] A magnetic flap level gauge 9 is installed on the outer circumferential surface of the cylinder 10-6, and an air space connecting pipe 10-3, a plurality of vertical plates 10-10, a plurality of conical plates 10-4 and a plurality of inverted conical buckets 10-5 are arranged inside the cylinder 10-6.

[0028] A plurality of vertical plates 10-10 are fixedly connected to the inner wall of the cylinder 10-6 in a circular array.

[0029] The conical plates 10-4 and the inverted conical buckets 10-5 are arranged alternately. Preferably, the conical plates 10-4 and the inverted conical buckets 10-5 are arranged alternately in sequence from the upper head 10-2 to the lower head 10-7; the conical plates 10-4 and the inverted conical buckets 10-5 are both installed on the vertical plate 10-10.

[0030] The apex of the conical plate 10-4 faces the upper head 10-2, and the small end opening of the inverted conical bucket 10-5 faces the lower head 10-7. With this arrangement, water enters the oxygen concentration analysis tank 10 from the sampling inlet 10-12 and then deflects in sequence, which is beneficial to increase the contact area between water and nitrogen in the gas chamber, accelerates the separation of dissolved oxygen, and avoids the problem that dissolved oxygen may not overflow when water flows through the gas chamber.

[0031] A plurality of ventilation holes are formed on the air space connecting pipe 10 - 3 , and the axes of the ventilation holes are parallel to the horizontal plane.

[0032] The axis of the air space connecting pipe 10-3 is parallel to the axis of the cylinder 10-6, and the air space connecting pipe 10-3 passes through the conical plate 10-4 and the inverted conical bucket 10-5 in sequence, and the conical plate 10-4 and the inverted conical bucket 10-5 are both fixedly connected to the air space connecting pipe 10-3.

[0033] Specific implementation method 2: Combination Figures 1 to 2 To illustrate the present embodiment, in the present embodiment, an anti-vortex baffle 10-9 is installed on the lower head 10-7, and the anti-vortex baffle 10-9 is fixedly connected to the lower head 10-7 through ribs, and the anti-vortex baffle 10-9 is coaxially arranged with the sampling outlet 10-8. Such an arrangement, on the one hand, prevents water from carrying out gas when flowing in the oxygen concentration analysis tank 10, and on the other hand, avoids frequent replenishment of nitrogen into the oxygen concentration analysis tank 10.

[0034] Other components and connection relationships are the same as those in the first specific implementation method.

[0035] Specific implementation method three: Combination Figures 1 to 2 To explain this embodiment, in this embodiment, the material of the conical plate 10-4 and the inverted conical bucket 10-5 are both low alloy steel.

[0036] Furthermore, the cone angle of the conical plate 10 - 4 is 150°.

[0037] Furthermore, the cone angle of the inverted cone bucket 10-5 is 150°.

[0038] The other components and connection relationships are the same as those in the first or second specific implementation.

[0039] How it works

[0040] The sampling inlet 10-12 is connected to the outlet of the upstream heat exchanger 5, the sampling outlet 10-8 is connected to the inlet of the downstream heat exchanger 6, and the outlet of the upstream heat exchanger 5 is connected to the inlet of the downstream heat exchanger 6 through the main pipeline 3. This arrangement avoids the problem of uneven distribution of oxygen content at the outlet of the upstream heat exchanger 5, which leads to the inability to accurately monitor leakage from the air side to the water side.

[0041] When the air side of the heat exchanger leaks to the water side, the proportion of oxygen on the water side increases, which manifests itself as bubbles that have not yet dissolved, and as an increase in the oxygen concentration in the water.

[0042] After the air enters the water, a portion of the air flows directly from the upstream heat exchanger 5 through the main pipeline 3 into the downstream heat exchanger 6, and the remaining air enters the oxygen concentration analysis tank 10 along with the water.

[0043] After the water enters the oxygen concentration analysis tank 10, it flows to the lower head 10-7 under the action of the conical plate 10-4 and the inverted conical bucket 10-5, and finally flows to the downstream heat exchanger 6 from the sampling outlet 10-8.

[0044] Therefore, the lower part of the oxygen concentration analysis tank 10 is water, and the upper part is a gas chamber, and the two interfaces of the magnetic flap level gauge 9 are respectively connected to the upper and lower parts of the cylinder 10-6.

[0045] The nitrogen source 11 is connected to the nitrogen inlet 10 - 11 , and the nitrogen source 11 introduces nitrogen into the gas cavity.

[0046] When no leakage occurs, the online oxygen concentration analyzer 1 detects that the oxygen concentration in the gas cavity is zero. After entering the oxygen concentration analysis tank 10, the air in the form of bubbles will directly mix with the nitrogen and water vapor in the gas cavity, causing the oxygen concentration in the gas cavity to increase, which is monitored in real time by the online oxygen concentration analyzer 1; after entering the oxygen concentration analysis tank 10, the air in the form of dissolved oxygen will gradually overflow into the gas cavity due to the concentration difference between water and gas oxygen and the effect of successive deflection, and mix with the nitrogen and water vapor in the gas cavity, causing the oxygen concentration in the gas cavity to increase, which is monitored in real time by the online oxygen concentration analyzer 1.

[0047] The present invention has been disclosed as above in the form of a preferred embodiment, but it is not intended to limit the present invention. Any simple modification, equivalent changes and modifications made to the above implementation cases by any professional and technical personnel who do not deviate from the content of the technical solution of the present invention and based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An air leakage monitoring device for a heat exchanger, characterized in that: It includes an oxygen concentration analysis tank (10); The oxygen concentration analysis tank (10) comprises an upper end cap (10-2), a cylinder (10-6) and a lower end cap (10-7); The upper end cap (10-2) and the lower end cap (10-7) are coaxially fixedly connected to the two ends of the cylinder (10-6), respectively; the upper end cap (10-2) is provided with an online oxygen concentration analyzer (1), and the upper end cap (10-2) is provided with a nitrogen inlet (10-11) and a sampling inlet (10-12); and the lower end cap (10-7) is provided with a sampling outlet (10-8); A magnetic flap liquid level gauge (9) is installed on the outer circumferential surface of the cylinder (10-6), and an air space connecting pipe (10-3), a plurality of vertical plates (10-10), a plurality of conical plates (10-4) and a plurality of inverted conical buckets (10-5) are arranged inside the cylinder (10-6); A plurality of vertical plates (10-10) are fixedly connected to the inner wall of the cylinder (10-6) in a circular array; The conical plates (10-4) and the inverted conical buckets (10-5) are arranged alternately, and the conical plates (10-4) and the inverted conical buckets (10-5) are both installed on the vertical plate (10-10); The apex of the conical plate (10-4) faces the upper end cover (10-2), and the small end opening of the inverted conical bucket (10-5) faces the lower end cover (10-7); The air space connecting pipe (10-3) is provided with a plurality of vent holes, the axis of the air space connecting pipe (10-3) is parallel to the axis of the cylinder (10-6), the air space connecting pipe (10-3) passes through the conical plate (10-4) and the inverted conical bucket (10-5) in sequence, and the conical plate (10-4) and the inverted conical bucket (10-5) are both fixedly connected to the air space connecting pipe (10-3).

2. The air leakage monitoring device for a heat exchanger according to claim 1, characterized in that: An anti-vortex baffle (10-9) is installed on the lower sealing head (10-7), and the anti-vortex baffle (10-9) is coaxially arranged with the sampling outlet (10-8).

3. The air leakage monitoring device for a heat exchanger according to claim 2, characterized in that: The axis of the vent hole is parallel to the horizontal plane.

4. The air leakage monitoring device for a heat exchanger according to claim 3, characterized in that: The conical plate (10-4) and the inverted conical bucket (10-5) are both made of low alloy steel.

5. The air leakage monitoring device for a heat exchanger according to claim 4, characterized in that: The cone angle of the conical plate (10-4) is 150°.

6. The air leakage monitoring device for a heat exchanger according to claim 5, characterized in that: The cone angle of the inverted cone bucket (10-5) is 150°.

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