Industrial heat supply system

Abstract

The utility model discloses an industrial heat supply system, which belongs to the technical field of heat exchange station heat supply equipment operation and comprises a first-section heating device and a second-section heating device, the first-section heating device comprises a low-temperature path and a first stock solution path, and the temperature of a low-temperature medium in the low-temperature path is higher than that of a first stock solution in the first stock solution path; the second-section heating device comprises a high-temperature path and a second stock solution path, and the temperature of a high-temperature medium in the high-temperature path is higher than that of a second stock solution in the second stock solution path; the high-temperature medium source, the high-temperature path, the low-temperature path and the low-temperature medium storage device are sequentially communicated; the stock solution source, the first stock solution path, the second stock solution path and the heat utilization equipment are communicated in sequence. The low-temperature medium with lower temperature is used for heating the first stock solution with lower temperature, and the high-temperature medium with higher temperature is used for heating the second stock solution with higher temperature, so that the temperature difference between the cold medium and the hot medium in the heat exchange process can be reduced, and dirt is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of operation of heating equipment of a heat exchange station, in particular to an industrial heating system. Background Art

[0002] Shell-and-tube heat exchangers are critical heat exchange equipment in heavy industries such as salt chemicals and oilfield chemicals. Their stable and efficient performance is directly related to production continuity and product quality. However, in actual operation, the treatment media often contain high concentrations of salt, complex components, and high-hardness substances, coupled with the significant temperature difference between the cold and hot media. These factors combine to easily form stubborn dirt on the inner walls of the heat exchanger tube bundle. This dirt not only significantly reduces heat exchange efficiency and increases energy consumption, but in severe cases, it can cause tube bundle blockage, forcing production interruptions, resulting in significant economic losses and safety hazards for enterprises.

[0003] To address the above issues, existing anti-scaling / de-scaling technologies mainly include mechanical, chemical, and physical methods. Mechanical methods, such as high-pressure water gun cleaning and scraper cleaning, can directly remove some dirt, but the operation is complicated and can easily cause mechanical damage to the equipment pipe wall, shortening the equipment life. Chemical methods, such as scale inhibitors and cleaning agents, can effectively inhibit scale formation and remove existing scale, but the use of chemical agents may corrode the equipment material, and improper handling of the treated wastewater can also cause environmental pollution problems. Physical methods, such as vibration de-scaling, are environmentally friendly and cause little damage to the equipment, but their de-scaling efficiency is relatively limited, making it difficult to meet the needs of efficient production.

[0004] In view of the limitations and shortcomings of the above technologies, how to effectively remove and prevent dirt in the tube bundle is a technical problem that needs to be solved. Utility Model Content

[0005] The purpose of the present utility model is to provide an industrial heating system to solve the problems existing in the above-mentioned prior art. A low-temperature medium with a lower temperature is used to heat a first raw liquid with a lower temperature, and a high-temperature medium with a higher temperature is used to heat a second raw liquid with a higher temperature, thereby reducing the temperature difference between the cold and hot media during the heat exchange process and reducing the occurrence of fouling.

[0006] To achieve the above purpose, the present invention provides the following solutions:

[0007] The utility model provides an industrial heating system, comprising a first-stage heating device and a second-stage heating device, wherein the first-stage heating device comprises a low-temperature path and a first raw liquid path, the temperature of the low-temperature medium in the low-temperature path is higher than the temperature of the first raw liquid in the first raw liquid path; the second-stage heating device comprises a high-temperature path and a second raw liquid path, the temperature of the high-temperature medium in the high-temperature path is higher than the temperature of the second raw liquid in the second raw liquid path; the inlet of the high-temperature path is used to connect to a high-temperature medium source, the outlet of the high-temperature path is connected to the inlet of the low-temperature path, and the outlet of the low-temperature path is used to connect to a low-temperature medium storage device; the inlet of the first raw liquid path is used to connect to a raw liquid source, the outlet of the first raw liquid path is connected to the inlet of the second raw liquid path, and the outlet of the second raw liquid path is used to connect to a heat-using device.

[0008] In one embodiment, the low-temperature path is a condensed water path, condensed water flows in the condensed water path, the high-temperature path is a steam path, steam flows in the steam path, the high-temperature medium source is a steam source, and the low-temperature medium storage device is a condensed water storage device; the first raw liquid path is a first raw water path, the second raw liquid path is a second raw water path, and the raw liquid source is a raw water source.

[0009] In one embodiment, both the first-stage heating device and the second-stage heating device are shell and tube heat exchangers.

[0010] In one embodiment, the first stage heating device adopts a two-tube-pass heat exchanger, and the second stage heating device adopts a four-tube-pass heat exchanger.

[0011] In one embodiment, the two-stage heating device includes two or more four-pass heat exchangers arranged in parallel.

[0012] In one embodiment, the two-tube-pass heat exchanger is installed horizontally, and the four-tube-pass heat exchanger is installed vertically.

[0013] In one embodiment, the inlet of the first raw water path is connected to the heat exchanger water tank via a pump group, and the pump group includes two or more water pumps arranged in parallel.

[0014] In one embodiment, an ultrasonic device is further included, wherein the ultrasonic device includes a host and a transducer connected by a cable, and the transducer is installed at the metal tube plate position of the shell and tube heat exchanger.

[0015] In one embodiment, in the heating device, the number of the transducers arranged near the inlet of the steam path is greater than the number of the transducers arranged near the outlet of the steam path. For the transducers arranged near the inlet of the steam path, the number of the transducers matched in the rear half of the tube is greater than the number of the transducers matched in the front half of the tube.

[0016] In one embodiment, the transducers arranged near the inlet of the steam path match one-pass, two-pass, three-pass and four-pass in number, respectively, and the transducers arranged near the outlet of the steam path match one-pass, two-pass, three-pass and four-pass in number, respectively, two, one, one and two.

[0017] Compared with the prior art, the utility model has achieved the following technical effects:

[0018] The utility model adopts a first-stage heating device and a second-stage heating device arranged in series. In the second-stage heating device, a high-temperature medium is used to heat the second stock liquid, and in the first-stage heating device, a low-temperature medium is used to heat the first stock liquid with a lower temperature. The low-temperature medium with a lower temperature is used to heat the first stock liquid with a lower temperature, and the high-temperature medium with a higher temperature is used to heat the second stock liquid with a higher temperature, thereby reducing the temperature difference between the cold and hot media during the heat exchange process and reducing the occurrence of fouling.

[0019] Other technical solutions included in this utility model can also achieve the following technical effects:

[0020] The utility model adopts steam as the high-temperature medium, condensed water as the low-temperature medium, and raw water as the raw liquid. The lower-temperature condensed water can be used to heat the first raw water with a lower temperature, and the higher-temperature steam can be used to heat the second raw water with a higher temperature, thereby reducing the temperature difference between the cold and hot media during the heat exchange process and reducing the occurrence of fouling.

[0021] The utility model is provided with a transducer at the metal tube sheet position of the shell and tube heat exchanger, which can use ultrasonic vibration to better descale and prevent scaling of the tube bundle on the basis of segmented heating, thereby being able to continuously supply heat for process production, avoiding insufficient heat supply and scaling of the tube bundle, and making the heating system have sufficient heating and anti-scaling / de-scaling capabilities, so as to significantly improve heat exchange efficiency, reduce operating costs, promote the green and sustainable development of industrial production, and contribute to achieving the "carbon emission reduction" goal in the heating field. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a process flow chart of an industrial heating system in an embodiment of the present utility model;

[0024] Figure 2 for Figure 1 Middle partial view;

[0025] Figure 3 This is the schematic diagram of the segmented heating principle of the utility model;

[0026] Figure 4 This is a schematic diagram of a heat exchanger used in a first stage heating device in an embodiment of the present utility model;

[0027] Figure 5 for Figure 4 Side view of;

[0028] Figure 6 This is a schematic diagram of the heat exchanger used in the second-stage heating device in the embodiment of the present utility model;

[0029] Figure 7 for Figure 6 Side view of

[0030] Figure 8 Schematic diagram of the distribution of transducers near the steam inlet;

[0031] Figure 9 is a schematic diagram of the distribution of transducers near the first condensate water outlet;

[0032] Figure 10 This is a schematic diagram of the outlet water temperature of the prior art process;

[0033] Figure 11 This is a schematic diagram of the outlet water temperature after the implementation of the utility model;

[0034] Figure 12 This is a statistical diagram of water flow and temperature difference changes in the utility model;

[0035] Among them, 1. One-stage heating device; 11. First raw water inlet; 12. First raw water outlet; 13. Condensate water inlet; 14. Second condensate water outlet; 15. First sight glass; 16. Condensate water path; 17. First raw water path; 2. Two-stage heating device; 21. Second raw water inlet; 22. Second raw water outlet; 23. Steam inlet; 24. First condensate water outlet; 25. Second sight glass; 26. Steam path; 27. Second raw water path; 3. Pump group; 4. One pipe pass; 5. Two pipe passes; 6. Three pipe passes; 7. Four pipe passes; 8. Transducer. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] The purpose of the utility model is to provide an industrial heating system to solve the problems existing in the prior art. The system uses condensed water with a lower temperature to heat the first raw water with a lower temperature, and uses steam with a higher temperature to heat the second raw water with a higher temperature, thereby reducing the temperature difference between the cold and hot media during the heat exchange process and reducing the occurrence of fouling.

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0039] like Figures 1 to 12As shown, the present invention provides an industrial heating system comprising a first-stage heating device 1 and a second-stage heating device 2. The first-stage heating device 1 includes a low-temperature path and a first stock liquid path. The low-temperature path carries a low-temperature medium obtained by lowering the temperature of the high-temperature medium in the second-stage heating device 2 after heat exchange. The first stock liquid path carries a first stock liquid to be heated, and the temperature of the low-temperature medium is higher than that of the first stock liquid. The second-stage heating device 2 includes a high-temperature path and a second stock liquid path. The high-temperature path carries a high-temperature medium, and the second stock liquid path carries a second stock liquid obtained by raising the temperature of the first stock liquid in the first-stage heating device 1 after heat exchange, and the temperature of the high-temperature medium is higher than that of the second stock liquid. It should be noted that the low-temperature medium and high-temperature medium mentioned above are relative terms; that is, the temperature of the low-temperature medium is lower than that of the high-temperature medium, but this does not represent the absolute temperature of the low-temperature medium and the high-temperature medium. The high-temperature medium may change state after releasing heat, for example, from gas to liquid. The medium used may be thermal oil, steam, molten salt, etc. The stock liquid mentioned above may be water, oil, or other materials that need to be heated to transfer heat to the heat-consuming equipment.

[0040] The inlet of the high-temperature path is used to connect to the high-temperature medium source, the outlet of the high-temperature path is connected to the inlet of the low-temperature path, and the outlet of the low-temperature path is used to connect to the low-temperature medium storage device. That is, the medium enters the high-temperature path from the high-temperature medium source as a high-temperature medium, cools down after heat exchange in the high-temperature path, enters the low-temperature path as a low-temperature medium, continues to cool down after heat exchange in the low-temperature path, and finally enters the low-temperature medium storage device.

[0041] The inlet of the first stock liquid path is used to connect to the stock liquid source, the outlet of the first stock liquid path is connected to the inlet of the second stock liquid path, and the outlet of the second stock liquid path is used to connect to the heat-using equipment. That is, the stock liquid enters the first stock liquid path from the stock liquid source as the first stock liquid, heats up after heat exchange in the first stock liquid path, enters the second stock liquid path as the second stock liquid, continues to heat up after heat exchange in the second stock liquid path, and is finally supplied to the heat-using equipment.

[0042] The utility model adopts a first-stage heating device 1 and a second-stage heating device 2 arranged in series. In the second-stage heating device 2, a high-temperature medium is used to heat the second stock liquid. In the first-stage heating device 1, a low-temperature medium is used to heat the first stock liquid with a lower temperature. The low-temperature medium with a lower temperature is used to heat the second stock liquid with a higher temperature. Therefore, the temperature difference between the cold and hot media in the heat exchange process can be reduced, and the occurrence of fouling can be reduced.

[0043] In one embodiment, the low-temperature path is a condensate path 16, through which condensate flows. The high-temperature path is a steam path 26, through which steam flows. The high-temperature medium source is a steam source, and the low-temperature medium storage device is a condensate storage device. The first raw liquid path is a first raw water path 17, and the second raw liquid path is a second raw water path 27. The raw liquid source is a raw water source. Specifically, heated raw water flows through the first and second raw water paths 17 and 27, and the temperature of the second raw water in the second raw water path 27 is higher than that of the first raw water in the first raw water path 17. The first raw water path 17 has a first raw water inlet 11 and a first raw water outlet 12 at its ends, respectively. The second raw water path 27 has a second raw water inlet 21 and a second raw water outlet 22 at its ends. Raw water enters the first raw water path 17 through the first raw water inlet 11, flows out through the first raw water outlet 12, enters the second raw water path 27 through the second raw water inlet 21, and finally flows out through the second raw water outlet 22. The two ends of the steam path 26 are the steam inlet 23 and the first condensate outlet 24 respectively, and the two ends of the condensate path 16 are the condensate inlet 13 and the second condensate outlet 14 respectively. Steam enters the steam path 26 from the steam inlet 23, becomes condensed water and flows out from the first condensate outlet 24, enters the condensate path 16 through the condensate inlet 13, and finally flows out from the second condensate outlet 14.

[0044] In one embodiment, the heat exchange media in the first-stage heating device 1 are condensed water (hot) and first raw water (cold), with temperatures of approximately 70°C and 15°C, respectively. The outlet water temperature of the first-stage heating device 1 is controlled within a range of 25-30°C. In the second-stage heating device 2, the heat exchange media are steam (hot) and the outlet water from the first heating stage, or second raw water (cold), with temperatures of approximately 144°C and 25°C, respectively. The outlet water temperature of the second-stage heating device 2 is >90°C. This two-stage heating method effectively shortens the temperature difference between the hot and cold media in the heat exchange, thereby achieving anti-scaling and descaling effects.

[0045] In one embodiment, both the first-stage heating device 1 and the second-stage heating device 2 utilize shell-and-tube heat exchangers. These shell-and-tube heat exchangers comprise a tube side and a shell side. The first and second raw water paths 17 and 27 form the tube side, while the steam path 26 and condensate path 16 form the shell side. Staged heating in industrial heating systems involves connecting shell-and-tube heat exchangers in series, minimizing the temperature difference between the cold and hot media during heat exchange, reducing fouling, and specifically preventing and delaying scaling, thereby increasing heat exchange efficiency.

[0046] In one embodiment, the first-stage heating device 1 utilizes a two-pass heat exchanger, a floating-head shell-and-tube heat exchanger. During the first-stage heating process, the heat exchange temperature is low and the temperature differential is small, allowing the floating-head shell-and-tube heat exchanger to maintain scale-free operation. The second-stage heating device 2 utilizes a four-pass heat exchanger, a fixed-tubesheet shell-and-tube heat exchanger. During the second-stage heating process, under the conditions of the first-stage heating water supply, the outlet water temperature of the fixed-tubesheet shell-and-tube heat exchanger consistently meets process production requirements. The two-pass heat exchanger is equipped with a first sight glass 15, and the four-pass heat exchanger is equipped with a second sight glass 25. The first sight glass 15 and the second sight glass 25 can be used to observe the scale formation of the heat exchanger tube bundle.

[0047] In one embodiment, the second-stage heating device 2 includes two or more four-pass heat exchangers arranged in parallel.

[0048] In one embodiment, the two-tube-pass heat exchanger in the first-stage heating device 1 is installed horizontally, and the four-tube-pass heat exchanger in the second-stage heating device 2 is installed vertically.

[0049] In one embodiment, the inlet of the first raw water path 17 , ie, the first raw water inlet 11 , is connected to the heat exchanger water tank via a pump group 3 . The pump group 3 includes two or more water pumps arranged in parallel.

[0050] In one embodiment, an ultrasonic device is also included. The ultrasonic device includes a main unit and a transducer 8 connected by a cable. The transducer 8 is installed at the metal tube sheet of the shell and tube heat exchanger, and the installation position is fully welded. The installation method of the transducer 8 can effectively transmit ultrasonic waves to each tube bundle through the metal tube sheet and ensure that the connection between the shell and tube heat exchanger and the transducer 8 is firm. Electrical energy is converted into mechanical energy at the transducer 8 to form ultrasonic waves, which produce cavitation, activation, shear and inhibition effects in the tube wall-liquid. Cavitation refers to the generation of cavities and bubbles in the liquid under the action of ultrasonic waves; activation is based on cavitation and promotes the combination of scaling ions; shear is the vibration of scaling caused by ultrasonic waves during the propagation of metal; inhibition is to prevent the attachment of crystal nuclei and scaling ions to the wall. By setting up ultrasonic equipment, the purpose of preventing and removing scaling in the tube bundle is achieved. Ultrasonic transmission is directional and can solve the scaling problem of the tube bundle in a targeted manner.

[0051] In one embodiment, in a heating device 1 , the number of transducers 8 disposed near the inlet of the steam path 26 (i.e., the steam inlet 23 ) is greater than the number of transducers 8 disposed near the outlet of the steam path 26 (i.e., the first condensate outlet 24 ).

[0052] In one embodiment, the number of transducers 8 installed near the steam inlet 23 is greater in the second half of the tube pass than in the first half. This installation method of the transducers 8 can prevent scaling in the tube bundle in a targeted manner. Different numbers of transducers 8 are matched to tube passes with different degrees of scaling, achieving better anti-scaling and descaling effects. This avoids power waste in the less scaled tube pass 4 and power shortage in the severely scaled outlet tube pass 7, which is achieved with uniform installation.

[0053] In one embodiment, the order from water inlet to water outlet is one pipe pass 4, two pipe passes 5, three pipe passes 6 and four pipe passes 7, and the installation position of the transducer 8 is adjusted according to the degree of scaling of the tube bundle. For example, the transducers 8 arranged near the steam inlet 23 match the numbers of one pipe pass 4, two pipe passes 5, three pipe passes 6 and four pipe passes 7 respectively, and the transducers 8 arranged near the first condensate outlet 24 match the numbers of one pipe pass 4, two pipe passes 5, three pipe passes 6 and four pipe passes 7 respectively.

[0054] In one embodiment, the use of ultrasonic equipment during the second heating stage reduces the frequency of on-site pickling, increases heat exchange efficiency, and reduces scaling to less than 1mm. The ultrasonic anti-scaling and descaling heating system and operating method of this invention can meet process production requirements with only two heat exchangers, compared to the previous three required for the same period, significantly improving heat exchange efficiency.

[0055] In one embodiment, the operating instructions and principles of the industrial heating system are as follows: Turn on the ultrasonic equipment main unit, and transducer 8 begins operation. Then, turn on pump unit 3, allow cold water to enter through the first raw water inlet 11, and steam to enter through the steam inlet 23. The first-stage heating device 1 and the second-stage heating device 2 begin normal operation. Due to the serious excess of various ions in the water quality, scale is easily formed in the heat exchanger during operation, seriously affecting the efficiency and service life of the heat exchanger. The ultrasonic equipment transducer 8 is installed on the metal tube sheet. Transducer 8 converts electrical energy into mechanical energy, generating ultrasonic vibration waves, which are transmitted through the metal tube sheet to each tube bundle. The ultrasonic waves generate shear forces and cavitation effects on the tube walls and surface dirt, thereby preventing and removing scale, improving the efficiency of the heat exchanger, and extending its service life.

[0056] In one embodiment, the present invention adopts ultrasonic equipment and two-stage heating method, which effectively solves the problem of tube bundle scaling in the traditional heat exchange process compared with the existing technology. Figure 10 As shown in Figure 2, the average temperature difference over 32 days dropped to 29.1°C, and the tube bundle was blocked; Figure 11 When the solution of the present invention is adopted, the change of the outlet water temperature difference is only positively correlated with the water flow rate. There is no temperature difference drop due to scaling restriction. In the absence of major changes in industrial conditions, the outlet water temperature remains stable.

[0057] In one embodiment, according to the operating method of the present invention, as Figure 12 As shown in the figure, the outlet water temperature difference changes relatively stably, within ±10℃. The points with abnormal temperature difference usually correspond to points where the water flow rate is too large or too low. In other cases, the operation is normal without scaling restrictions.

[0058] In one embodiment, according to the operating method of the present invention, previously 5 heat exchangers were required to meet the demand for hot water in on-site production, but now 4 heat exchangers can meet the demand for hot water in on-site production; the heat exchange efficiency is significantly improved.

[0059] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. An industrial heating system, characterized in that: include: a first stage heating device, the first stage heating device comprising a low-temperature path and a first raw liquid path, the temperature of the low-temperature medium in the low-temperature path being higher than the temperature of the first raw liquid in the first raw liquid path; and a two-stage heating device, the two-stage heating device comprising a high-temperature path and a second raw liquid path, the temperature of the high-temperature medium in the high-temperature path being higher than the temperature of the second raw liquid in the second raw liquid path; The inlet of the high-temperature path is used to connect to a high-temperature medium source, the outlet of the high-temperature path is connected to the inlet of the low-temperature path, and the outlet of the low-temperature path is used to connect to a low-temperature medium storage device; The inlet of the first stock liquid path is used to connect to a stock liquid source, the outlet of the first stock liquid path is connected to the inlet of the second stock liquid path, and the outlet of the second stock liquid path is used to connect to a heat-using device.

2. The industrial heating system according to claim 1, characterized in that: The low-temperature path is a condensed water path, and condensed water flows in the condensed water path; the high-temperature path is a steam path, and steam flows in the steam path; the high-temperature medium source is a steam source; and the low-temperature medium storage device is a condensed water storage device; the first raw liquid path is a first raw water path, the second raw liquid path is a second raw water path, and the raw liquid source is a raw water source.

3. The industrial heating system according to claim 2, characterized in that: The first stage heating device and the second stage heating device both adopt shell and tube heat exchangers.

4. The industrial heating system according to claim 3, characterized in that: The first stage heating device adopts a two-tube heat exchanger, and the second stage heating device adopts a four-tube heat exchanger.

5. The industrial heating system according to claim 4, characterized in that: The two-stage heating device includes two or more four-tube-pass heat exchangers arranged in parallel.

6. The industrial heating system according to claim 5, characterized in that: The two-tube-pass heat exchanger is installed horizontally, and the four-tube-pass heat exchanger is installed vertically.

7. The industrial heating system according to claim 3, characterized in that: The inlet of the first raw water path is connected to the heat exchanger water tank through a pump group, and the pump group includes two or more water pumps arranged in parallel.

8. The industrial heating system according to any one of claims 4 to 7, characterized in that: It also includes an ultrasonic device, which includes a host and a transducer connected by a cable, and the transducer is installed at the metal tube plate position of the shell and tube heat exchanger.

9. The industrial heating system according to claim 8, characterized in that: In the one-stage heating device, the number of the transducers arranged near the inlet of the steam path is greater than the number of the transducers arranged near the outlet of the steam path. For the transducers arranged near the inlet of the steam path, the number of the transducers matched in the rear half of the tube is greater than the number of the transducers matched in the front half of the tube.

10. The industrial heating system according to claim 9, characterized in that: The transducers arranged near the inlet of the steam path match one-pass, two-pass, three-pass and four-pass in number, respectively, and the transducers arranged near the outlet of the steam path match one-pass, two-pass, three-pass and four-pass in number, respectively, two, one, one and two.

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