A scaling and pitting monitoring device for a heat exchanger in a heat network system and its use method

Abstract

The present invention discloses a fouling and pitting monitoring device for a heat exchanger in a heat network system and its usage method, which includes a cold water chamber and a hot water chamber. The hot water chamber and the cold water chamber are separated by a stainless steel heat exchange plate and fixed into an integral structure. The cold water chamber has a cold water inlet and a cold water outlet. The secondary network incoming water pipeline is connected to the cold water inlet, and the cold water outlet is connected to the secondary network return water pipeline. The hot water chamber has a hot water outlet and a hot water inlet. The primary network incoming water pipeline is connected to the hot water inlet, and the hot water outlet is connected to the primary network return water pipeline. The water flow direction through the hot water chamber is opposite to that of the cold water chamber. A laser emitter is installed at the bottom of the cold water chamber, and the laser emitter is movably arranged on the outer surface of the cold water chamber. The present invention is installed in the bypass of the heat network heat exchanger, can more truly restore the water quality conditions during the operation of the heat network heat exchanger, and can judge the pitting and fouling conditions of the heat network heat exchanger without disassembling the heat network heat exchanger.

Description

Technical Field

[0001] The present invention belongs to the field of monitoring of heat supply pipe network systems, and particularly relates to a device for monitoring fouling and pitting corrosion of heat exchangers in a heat network system and a method for using the same. Background Art

[0002] Plate heat exchangers are important component devices in heat supply pipe networks. The heat exchange plates are usually made of 304 or 316L stainless steel. Pitting corrosion and fouling of the heat exchange plates are two major problems faced by heat network heat exchangers. Fouling of the heat exchange plates not only reduces the heat exchange efficiency of the plate heat exchanger, but also causes under-deposit corrosion of the heat exchange plates, which exacerbates the risk of heat exchange plate failure. After pitting corrosion perforation occurs on the heat exchange plates, it will cause unstable pressure difference of the heat exchanger and even cause the entire heat exchanger to stop operating. With the expansion of the scale of centralized heat supply and the implementation of new technologies such as "large temperature difference" and "long-distance heat supply", the operating temperature of the heat exchanger gradually increases; moreover, after the total water volume of the system increases, the water quality is not easy to control. These two factors both increase the risks of fouling and pitting corrosion of the heat exchange plates. During the operation of the heat exchanger, if the fouling and pitting corrosion conditions of the heat exchange plates can be monitored in real time and measures such as adjusting the dosage of scale and corrosion inhibitor and regulating the water quality are taken in time, greater damage to the heat exchanger can be avoided.

[0003] However, during the operation of the plate heat exchanger, it is in a closed state and there are no obvious characteristics in the initial stage of its fouling and pitting corrosion. Traditional heat exchanger fouling alarms and predictions are all based on the changes in the inlet and outlet water temperatures of the heat exchanger. When parameters such as the pressure difference and temperature difference of the heat exchanger change, obvious fouling problems often occur on the heat exchange plates, and early warning and prompt cannot be made in the initial stage of fouling. Currently, corrosion monitoring devices applied to industrial systems usually use electrochemistry linear polarization method, resistance probe, inductance probe and electric field matrix technology (FSM) and can only monitor the uniform corrosion situation of materials and cannot detect local corrosion such as pitting corrosion. In summary, there are no devices and methods on the market for monitoring the fouling and pitting corrosion conditions of heat exchangers in heat network systems. Summary of the Invention

[0004] In order to solve the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a device for monitoring fouling and pitting corrosion of heat exchangers in a heat network system and a method for using the same. This device is installed in the bypass of the heat exchanger, and by simulating the heat exchanger environment, real-time monitoring of the fouling and pitting corrosion conditions of the heat exchange plates is achieved, providing a reference for the addition of scale and corrosion inhibitor and water quality regulation.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A device for monitoring fouling and pitting corrosion of heat exchangers in a heat network system includes a cold water chamber and a hot water chamber. The hot water chamber and the cold water chamber are separated by a stainless steel heat exchange plate and fixed as an integrated structure;

[0007] The cold water chamber has a cold water inlet and a cold water outlet; the secondary network supply pipeline is connected to the cold water inlet, and the cold water outlet is connected to the secondary network return pipeline;

[0008] The hot water chamber has a hot water outlet and a hot water inlet; the primary network supply pipeline is connected to the hot water inlet, and the hot water outlet is connected to the primary network return pipeline;

[0009] The water flow direction through the hot water chamber is opposite to that of the cold water chamber;

[0010] A laser emitter is installed at the bottom of the cold water chamber, and the laser emitter is movably arranged on the outer surface of the cold water chamber.

[0011] As a further improvement of the present invention, both the cold water chamber and the hot water chamber are in the shape of a flat rectangle, and a pressure-resistant glass is installed on the surface of the cold water chamber, and the pressure-resistant glass is fixed with bolts.

[0012] As a further improvement of the present invention, the horizontal crossbar is fixedly arranged, the vertical rod is movably arranged on the horizontal crossbar, and the laser emitter is movably arranged on the vertical rod.

[0013] As a further improvement of the present invention, the surface of the stainless steel heat exchange plate is wavy.

[0014] As a further improvement of the present invention, the pressure-resistant glass is divided into three parts, namely a laser beam marking scale area, a magnified display area, and a normal observation area.

[0015] As a further improvement of the present invention, the laser beam marking scale area, the magnified display area, and the normal observation area are arranged in sequence from bottom to top.

[0016] A method for using a fouling and pitting monitoring device for a heat network system heat exchanger includes the following steps:

[0017] Install the fouling and pitting monitoring device for the heat network system heat exchanger on the bypass of the heat network heat exchanger;

[0018] Turn on the laser emitter, move horizontally and vertically along the horizontal crossbar and the vertical rod to scan and inspect the surface of the heat exchange plate. When the laser irradiates the surface of the non-fouled heat exchange plate, a light spot is formed in the laser beam marking scale area after reflection; when the laser irradiates the surface of the fouled heat exchange plate, the laser beam will have an obvious offset after reflection;

[0019] By moving the laser emitter, observe the light spot of the reflected laser beam to judge whether the surface of the heat exchanger is fouled.

[0020] The installation of the fouling and pitting monitoring device for the heat network system heat exchanger on the bypass of the heat network heat exchanger is specifically as follows:

[0021] Install the fouling and pitting monitoring device for the heat exchanger in the heat network system on the bypass of the heat network heat exchanger. The cold water inlet draws bypass water from the secondary network incoming water pipeline. After the water flows through the cold water chamber, it returns to the secondary network return water pipeline of the heat network heat exchanger from the cold water outlet;

[0022] The hot water inlet draws bypass water from the primary network incoming water pipeline. After the water flows through the hot water chamber, it returns to the primary network return water pipeline of the heat network heat exchanger from the hot water outlet;

[0023] The heat of the hot water flowing through the hot water chamber is transferred to the cold water in the cold water chamber through the stainless steel heat exchange plate.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] The device of the present invention is installed on the bypass of the heat network heat exchanger, which can more truly restore the operating water quality conditions of the heat network heat exchanger, and can judge the pitting and fouling conditions without disassembling the heat network heat exchanger. Based on the principle of laser reflection, this device can detect the slight fouling phenomenon on the surface of the heat exchange plate earlier and more timely.

[0026] This device is equipped with pressure-resistant glass to observe the fouling and pitting conditions of the heat exchanger in real time, and then analyze the fouling and pitting conditions of the heat exchanger without disassembling the heat exchanger. Brief Description of the Drawings

[0027] Figure 1 It is the front view of a device for monitoring the fouling and pitting conditions of the heat exchanger in the heat network system according to the present invention.

[0028] Figure 2 It is the side view of a device for monitoring the fouling and pitting conditions of the heat exchanger in the heat network system according to the present invention.

[0029] Figure 3 It is the installation schematic diagram of the fouling and pitting monitoring device of the present invention in the heat network system.

[0030] Figure 4 It is the schematic diagram of the fouling judgment principle of the present invention. Detailed Embodiment

[0031] Next, in combination with the drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0032] The present invention will be further described in combination with the drawings and specific embodiments.

[0033] Such as Figure 1 And Figure 2As shown in the figure, a scale and pitting monitoring device for a heat exchanger in a heat supply network system and its usage method. The device is provided with a cold water inlet 1, a cold water chamber 7, and a cold water outlet 2. The water from the secondary network of the heat supply network flows into the cold water inlet 1 through a bypass, passes through the cold water chamber 7, and flows back to the heat supply network system from the cold water outlet 1. The device is provided with a hot water outlet 3, a hot water chamber 6, and a hot water inlet 4. The hot water chamber 6 and the cold water chamber 7 are separated by a stainless-steel heat exchange plate 9. The heat of the hot water flowing through the hot water chamber 6 is transferred to the cold water in the cold water chamber 7 through the stainless-steel heat exchange plate 9. The cold water chamber is in a flat rectangular shape, and a pressure-resistant glass 5 is installed on the surface of the cold water chamber. The pressure-resistant glass is fixed to the surface of the cold water chamber with bolts 8, and the real-time situation of the heat exchange plate can be observed through the pressure-resistant glass 5 during operation.

[0034] A laser emitter 12 is installed at the bottom of the cold water chamber 7. The horizontal crossbar 11 is fixedly arranged, and the vertical rod 13 is movably arranged on the horizontal crossbar 11. The laser emitter 12 is movably arranged on the vertical rod 13. The laser emitter 12 can move horizontally along the horizontal crossbar 11, and the laser emitter 12 can move vertically along the vertical rod 13. The surface of the stainless-steel heat exchange plate 9 is wavy.

[0035] The present invention is installed in the bypass of the heat exchanger in the heat supply network, which can more truly restore the water quality conditions during the operation of the heat exchanger in the heat supply network. Without disassembling the heat exchanger in the heat supply network, the pitting and scaling conditions can be judged. Based on the principle of laser reflection, this device can detect the slight scaling phenomenon on the surface of the heat exchange plate earlier and more timely. This device is equipped with a pressure-resistant glass to observe the scaling and pitting conditions of the heat exchanger in real time, and then analyze the scaling and pitting conditions of the heat exchanger without disassembling the heat exchanger.

[0036] As a preferred embodiment, the pressure-resistant glass 5 is divided into three partial areas: a laser beam marking scale area 10, a magnification display area 14, and a normal observation area 19.

[0037] A horizontal crossbar 11 and a vertical rod 13 are arranged between the pressure-resistant glass 5 and the cold water chamber 7, and the laser emitter 12 can move along the horizontal crossbar 11 or the vertical rod 13.

[0038] As Figure 3 As shown in the figure, the scaling and pitting monitoring device is installed in the bypass of the heat exchanger in the heat supply network. The cold water inlet 2 of the device draws bypass water from the secondary network water supply pipeline 15. The water flows through the cold water chamber and then returns to the secondary network return pipeline 16 of the heat exchanger in the heat supply network from the cold water outlet 2. The hot water inlet 4 of the device draws bypass water from the primary network water supply pipeline 17. The water flows through the hot water chamber and then returns to the primary network return pipeline 18 of the heat exchanger in the heat supply network from the hot water outlet 3.

[0039] The present invention also provides a usage method for a scale and pitting monitoring device for a heat exchanger in a heat supply network system, including the following steps:

[0040] Install the fouling and pitting monitoring device for the heat exchanger in the heat network system on the bypass of the heat exchanger in the heat network.

[0041] Turn on the laser emitter 12 and move it horizontally along the horizontal cross bar 11 and vertically along the vertical rod 13 to scan and inspect the surface of the heat exchange plate. When the laser irradiates the surface of the unfouled heat exchange plate, a light spot is formed in the laser beam marking scale area 10 after reflection. When the laser irradiates the surface of the fouled heat exchange plate, the laser beam will have an obvious deviation after reflection.

[0042] By moving the laser emitter 12, observe the light spot of the reflected laser beam to judge whether the surface of the heat exchanger is fouled.

[0043] The installation of the fouling and pitting monitoring device for the heat exchanger in the heat network system on the bypass of the heat exchanger in the heat network is specifically as follows:

[0044] Install the fouling and pitting monitoring device for the heat exchanger in the heat network system on the bypass of the heat exchanger in the heat network. The cold water inlet 1 draws bypass water from the secondary network incoming water pipeline 15, and the water flows through the cold water chamber 7 and then returns to the secondary network return water pipeline 16 of the heat exchanger in the heat network through the cold water outlet 2.

[0045] The hot water inlet 4 draws bypass water from the primary network incoming water pipeline 17, and the water flows through the hot water chamber 6 and then returns to the primary network return water pipeline 18 of the heat exchanger in the heat network through the hot water outlet 3.

[0046] The heat of the hot water flowing through the hot water chamber 6 is transferred to the cold water in the cold water chamber 7 through the stainless steel heat exchange plate 9.

[0047] As Figure 4 shown, the usage method of this device is as follows:

[0048] Among them, install the fouling and pitting monitoring device 100 for the heat exchanger in the heat network system in the bypass of the heat exchanger 200 in the heat network.

[0049] The water in the secondary network is gradually heated as it flows through the cold water chamber. Therefore, it is most likely to be fouled at the position of the cold water outlet 2. Turn on the laser emitter 12 and move it horizontally along the horizontal cross bar 11 and vertically along the vertical rod 13 to scan and inspect the surface of the heat exchange plate. When the laser irradiates the surface of the unfouled heat exchange plate, a light spot is formed in the laser beam marking scale area 10 after reflection. When the laser irradiates the surface of the fouled heat exchange plate, the laser beam will have an obvious deviation after reflection. Therefore, it is possible to judge whether the surface of the heat exchanger is fouled by moving the laser emitter 12 and observing the light spot of the reflected laser beam.

[0050] The pitting condition of the heat exchange plate can be observed through the enlarged display area 14. When there is no pitting on the heat exchange plate, the surface of the heat exchange plate shows a metallic luster. When there are pitted corrosion pits on the surface of the heat exchange plate, it indicates that pitting has occurred on the heat exchange plate. Through this fouling and pitting monitoring device, when slight fouling or slight pitting occurs on the heat exchange plate, the dosage of the heat network circulating water and the water quality index can be adjusted.

[0051] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A monitoring device for fouling and pitting corrosion of a heat exchanger in a heat supply network system, characterized in that, It includes a cold water chamber (7) and a hot water chamber (6). The hot water chamber (6) and the cold water chamber (7) are separated by a stainless - steel heat - exchange plate (9) and fixed into an integral structure. The cold water chamber (7) has a cold water inlet (1) and a cold water outlet (2). The secondary network incoming water pipeline (15) is connected to the cold water inlet (1), and the cold water outlet (2) is connected to the secondary network return water pipeline (16). The hot water chamber (6) has a hot water outlet (3) and a hot water inlet (4). The primary network incoming water pipeline (17) is connected to the hot water inlet (4), and the hot water outlet (3) is connected to the primary network return water pipeline (18). The water flow direction through the hot water chamber (6) is opposite to that of the cold water chamber (7). A laser emitter (12) is installed at the bottom of the cold water chamber (7), and the laser emitter (12) is movably arranged on the outer surface of the cold water chamber (7). Both the cold water chamber (7) and the hot water chamber (6) are flat rectangles. A horizontal cross - bar (11) and a vertical rod (13) are arranged between the pressure - resistant glass (5) and the cold water chamber (7). The horizontal cross - bar (11) is fixedly arranged, the vertical rod (13) is movably arranged on the horizontal cross - bar (11), and the laser emitter (12) is movably arranged on the vertical rod (13). The pressure - resistant glass (5) is divided into three partial areas, namely a laser beam marking scale area (10), a magnified display area (14), and a normal observation area (19). The laser beam marking scale area (10), the magnified display area (14), and the normal observation area (19) are arranged in sequence from bottom to top.

2. The scaling and pitting corrosion monitoring device for a heat exchanger in a heat supply network system according to claim 1, wherein: A pressure - resistant glass (5) is installed on the surface of the cold water chamber (7), and the pressure - resistant glass (5) is fixed by bolts (8).

3. The scaling and pitting corrosion monitoring device for a heat exchanger in a heat supply network system according to claim 1, characterized in that: The surface of the stainless - steel heat - exchange plate (9) is wavy.

4. A method for using a monitoring device for fouling and pitting corrosion of a heat exchanger in a heat supply network system according to any one of claims 1 to 3, characterized in that, It includes the following steps: Install the fouling and pitting corrosion monitoring device of the heat - supply network system heat exchanger on the bypass of the heat - supply network heat exchanger. Turn on the laser emitter (12), move it horizontally and vertically along the horizontal cross - bar (11) and the vertical rod (13) to scan and inspect the surface of the heat - exchange plate. When the laser irradiates on the surface of the non - fouled heat - exchange plate, a light spot is formed in the laser beam marking scale area (10) after reflection; when the laser irradiates on the fouled surface of the heat - exchange plate, the laser beam will have an obvious deviation after reflection. By moving the laser emitter (12), observe the light spot of the reflected laser beam to judge whether the surface of the heat exchanger is fouled.

5. The method for using the device for monitoring fouling and pitting corrosion of the heat exchanger in the heat supply network system according to claim 4, characterized in that: The installation of the fouling and pitting corrosion monitoring device of the heat - supply network system heat exchanger on the bypass of the heat - supply network heat exchanger is specifically as follows: Install the fouling and pitting corrosion monitoring device of the heat - supply network system heat exchanger on the bypass of the heat - supply network heat exchanger. The cold water inlet (1) takes bypass water from the secondary network incoming water pipeline (15), and the water flows through the cold water chamber (7) and then returns to the secondary network return water pipeline (16) of the heat - supply network heat exchanger from the cold water outlet (2). The hot water inlet (4) takes bypass water from the primary network incoming water pipeline (17), and the water flows through the hot water chamber (6) and then returns to the primary network return water pipeline (18) of the heat - supply network heat exchanger from the hot water outlet (3). The heat of the hot water flowing through the hot water chamber (6) is transferred to the cold water in the cold water chamber (7) through the stainless - steel heat - exchange plate (9).

Images