CN107607269A - A kind of oily salt heat exchanger tube head leakage or the detection means and detection method of booster - Google Patents

Abstract

The invention relates to a detection device for leaking or bursting of the tube head of an oil-salt heat exchanger. The piston integrating the self-tightening sealing structure of the upper and lower ends and the sealing structure of the radial expansion ring is placed in the lower cylinder and placed in the upper cylinder. The spring assembly interacts with the piston through the piston rod. As for the partition between the upper and lower cylinders, a through hole is opened on the partition to maintain the communication between the upper and lower cylinders, and the molten salt side of the oil-salt heat exchanger and the heat conduction The signal ports connected to the oil side are respectively set on the upper and lower cylinders; the magnet set at the lower end of the piston and the magnetic switch set on the outer wall of the lower cylinder together form a signal transmission structure; the sewage and exhaust of the device can be installed on the device , The lower end takes over. The device of the invention can detect in time whether the connection joint between the heat exchange tube and the tube plate leaks or whether the heat exchange tube bursts during the operation process of the oil-salt heat exchanger, and sends out an accident signal to provide a chain action signal for the overpressure protection system.

Description

A detection device and detection method for oil-salt heat exchanger tube head leakage or tube burst

technical field

The invention relates to a detection device for leaking or bursting of a tube head of an oil-salt heat exchanger. It is mainly used to detect whether the heat exchange tube and the tube sheet connection joint of the oil-salt heat exchanger are leaking or whether the heat exchange tube is burst during operation.

Background technique

The oil-salt heat exchanger is an important part of the photothermal power plant. Its function is to transfer the heat collected by the solar light field to the steam generation system in the generator set, thereby providing energy for the entire power station. During the day, after the molten salt absorbs solar energy through the light field, part of it is stored in the molten salt tank, and part of it is sent to the oil-salt heat exchanger to heat the heat transfer oil, and the heated heat transfer oil is sent to the steam generation system to generate high-temperature and high-pressure steam. Then the steam turbine is driven to drive the entire generator set to run; at night, the molten salt stored during the day is extracted from the molten salt tank and delivered to the oil-salt heat exchanger to continue this energy conversion.

It can be seen that the safe operation of the oil-salt heat exchanger is very critical for solar thermal power plants, but due to the harsh operating conditions, the oil-salt heat exchanger not only needs to withstand high temperatures, but also needs to withstand at least two cyclic loads every day , so the oil-salt heat exchanger tube sheet and heat exchange tube joints are also relatively prone to leakage. If it cannot be found and repaired in time, it will cause greater safety hazards.

Contents of the invention

The purpose of the present invention is to provide a detection device for leaking or bursting of the tube head of an oil-salt heat exchanger, which can detect in time whether the connection joint between the heat exchange tube and the tube sheet is leaking or whether the heat exchange tube is leaking during the operation of the oil-salt heat exchanger. Explode the tube and send out an accident signal to provide a chain action signal for the overpressure protection system.

The technical solution adopted by the present invention to solve the above problems is: a detection device for oil-salt heat exchanger tube head leakage or burst tube, the piston integrating the self-tightening sealing structure of the upper and lower ends and the sealing structure of the radial expansion ring is placed under the In the cylinder, the spring assembly placed in the upper cylinder interacts with the piston through the piston rod. As for the upper and lower cylinders, they can be distinguished by the partition in the middle, but the holes on the partition will maintain the distance between the upper and lower cylinders. The signal ports connected with the molten salt side and the heat transfer oil side of the oil-salt heat exchanger are respectively set on the upper and lower cylinders; the magnet set at the lower end of the piston and the magnetic switch set on the outer wall of the lower cylinder together form a Signal transmission structure; the sewage and exhaust of the device can be realized through the connecting pipes arranged at the upper and lower ends of the device.

In addition, the upper and lower supports on the cylinder constitute the entire detection device.

A method for detecting tube head leakage or tube burst of an oil-salt heat exchanger, using the above-mentioned detection device, the signal connection port on the heat transfer oil side and the signal connection port on the molten salt side are connected to the heat transfer oil side and the molten salt side of the oil-salt heat exchanger respectively , during normal operation, the pressure on the heat transfer oil side is much higher than that on the molten salt side, so the piston will move to the upper part of the lower cylinder under the pressure difference; when the oil-salt heat exchanger tube head leaks or the heat exchange tube bursts At this time, a large amount of heat transfer oil on the heat transfer oil side will leak to the molten salt side, causing the pressure on both sides to tend to be the same, the pressure difference supporting the piston disappears, and the piston moves downward quickly under the action of the spring. The magnetic switch of the magnetic switch will capture the signal of the piston movement, so as to judge whether there is a leakage accident in the oil-salt heat exchanger; and the upper and lower self-tightening sealing structures and the radial expansion ring sealing structure arranged on the piston can ensure heat conduction at any time The media on the oil side and molten salt side will not leak through the detection device.

Compared with the prior art, the present invention has the advantages of:

During the operation of the oil-salt heat exchanger, it can be found in time whether the connection between the heat exchange tube and the tube sheet is leaking or whether the heat exchange tube is burst, and an accident signal is sent to provide a chain action signal for the overpressure protection system.

Description of drawings

Figure 1 is a schematic diagram of the basic working principle of the oil-salt heat exchanger tube head leakage or tube burst detection device;

Fig. 2 is a structural diagram of a detection device for tube head leakage or burst of an oil-salt heat exchanger.

in:

Upper cylinder 1, lower cylinder 2, spring assembly 3, piston rod 4, piston 5, magnet 6, magnetic switch 7, heat transfer oil side signal connection port 8, sewage outlet 9, molten salt side signal connection port 10, exhaust Mouth 11, upper support 12, lower support 13.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1, a detection device for oil-salt heat exchanger tube head leakage or pipe burst in this embodiment includes a piston structure, a self-tightening sealing structure at the upper end of the piston, a radial expansion ring sealing structure of the piston, and a lower end of the piston. Sealing structure, signal transmission structure, spring assembly, upper and lower cylinder structure and signal connection port, etc.

The piston 5 integrating the self-tightening seal structure of the upper and lower ends and the radial expansion ring seal structure is placed in the lower cylinder 2, and the spring assembly 3 placed in the upper cylinder 1 interacts with the piston 5 through the piston rod 4, As for the upper and lower cylinders, they can be distinguished by the partition in the middle, but the holes on the partition will maintain the communication between the upper and lower cylinders, and the signals connected to the molten salt side and heat transfer oil side of the oil-salt heat exchanger The ports are respectively arranged on the upper and lower cylinders; the magnet 6 arranged at the lower end of the piston and the magnetic switch 7 arranged on the outer wall of the lower cylinder together form a signal transmission structure; the blowdown and exhaust of the device can be carried out through the The connecting pipe is realized, and the upper and lower supports on the cylinder barrel are added to form the whole detection device.

A detection method for leaking or bursting of a tube head of an oil-salt heat exchanger. The signal connection port on the heat transfer oil side and the signal connection port on the molten salt side are respectively connected to the heat transfer oil side and the molten salt side of the oil-salt heat exchanger. , the pressure on the heat transfer oil side is much higher than that of the molten salt side, so the piston will move to the upper part of the lower cylinder under the action of the pressure difference; when the oil-salt heat exchanger tube head leaks or the heat exchange tube bursts, the heat transfer oil side A large amount of heat transfer oil will leak to the molten salt side, causing the pressure on both sides to tend to be the same, the pressure difference supporting the piston disappears, and the piston moves down quickly under the action of the spring, at this time, the magnetic switch set at a certain position will catch The signal to the movement of the piston can be used to determine whether there is a leakage accident in the oil-salt heat exchanger; the upper and lower self-tightening sealing structures and the radial expansion ring sealing structure on the piston can ensure that the heat transfer oil side and the molten salt The medium on the side will not leak through the detection device.

In addition to the above-mentioned embodiments, the present invention also includes other implementations, and any technical solution formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the claims of the present invention.

Claims (3)

1. A detection device for oil-salt heat exchanger tube head leakage or pipe burst, characterized in that: the piston integrating the self-tightening sealing structure of the upper and lower ends and the sealing structure of the radial expansion ring is placed in the lower cylinder, and placed in the The spring assembly in the upper cylinder interacts with the piston through the piston rod. There is a partition between the upper and lower cylinders, and a through hole is opened on the partition to maintain the communication between the upper and lower cylinders. It is connected to the molten salt side of the oil-salt heat exchanger. The signal ports connected to the heat transfer oil side are respectively set on the upper and lower cylinders; the magnet set at the lower end of the piston and the magnetic switch set on the outer wall of the lower cylinder together form a signal transmission structure; the sewage and exhaust of the device are set on the device The connection between the upper and lower ends is realized. 2. A detection device for leaking or bursting of a tube head of an oil-salt heat exchanger according to claim 1, characterized in that: upper and lower supports are arranged on the cylinder. 3. A detection method for oil-salt heat exchanger tube head leakage or pipe burst, characterized in that: using the detection device according to claim 1 or 2, the signal connection port on the heat-conducting oil side and the signal connection port on the molten salt side are connected to the oil-salt side signal connection port respectively. The heat transfer oil side and the molten salt side of the heat exchanger are connected. During normal operation, the pressure on the heat transfer oil side is much higher than that on the molten salt side, so the piston will move to the upper part of the lower cylinder under the action of the pressure difference; When the heater tube head leaks or the heat exchange tube bursts, a large amount of heat transfer oil on the heat transfer oil side will leak to the molten salt side, causing the pressure on both sides to tend to be the same, the pressure difference supporting the piston disappears, and the piston is under the action of the spring. Move down quickly, at this time, the magnetic switch set at a certain position will capture the signal of the piston movement, so as to judge whether there is a leakage accident in the oil-salt heat exchanger; and the upper and lower self-tight sealing structures set on the piston and The radial expansion ring sealing structure can ensure that the medium on the heat transfer oil side and molten salt side will not leak through the detection device at any time.