High-voltage static resistance scaling system and method for high-salinity wastewater heat exchanger

Abstract

The invention discloses a high-voltage static resistance scaling system and method for a high-salinity wastewater heat exchanger. The high-voltage static resistance scaling system comprises a cathode shell, an intelligent controller and an evaporation and concentration device heat exchanger. A plurality of water inlets are formed in the bottom of the cathode shell, an anode is arranged in the cathode shell, a water outlet is formed in the side face of the top of the cathode shell, the intelligent controller is connected with the cathode shell and the anode, the water outlet is communicated with a heat exchange pipe in the evaporation and concentration device heat exchanger, and a steam inlet is formed in the shell side of the evaporation and concentration device heat exchanger. According to the system and the method, the scaling rate of the heat exchanger can be greatly delayed, the heat exchange efficiency is improved, chemicals are not used, and the burden of the environment is not increased.

Description

Technical Field

[0001] The invention belongs to the technical field of energy conservation and environmental protection of coal-fired power plants, and relates to a high-pressure static anti-scaling system and method for a high-salt wastewater heat exchanger. Background Art

[0002] High-salinity wastewater treatment is one of the main research objects in the field of energy-saving and environmental protection technology of coal-fired power plants. Due to its high salt content and high hardness, it is very difficult to treat. Thermal concentration treatment technology is currently a more commonly used process, in which heat exchangers are its core treatment equipment. However, due to the high content of Ca in high-salinity wastewater during evaporation and concentration, 2+ Mg 2+ Plasma can easily combine with carbonates to form a scale layer on the surface of the heat exchanger, which will greatly reduce the operating efficiency of the heat exchanger. Therefore, scale inhibition technology plays an important role in the treatment of high-salt wastewater.

[0003] The patent of publication number CN209835730U discloses an electrostatic water treatment device, comprising a cathode cylinder, an anode core rod spaced inside the cathode cylinder, a connection portion arranged at both ends of the cathode cylinder, and an electrostatic high-voltage generator, wherein the cathode cylinder is a metal cylinder, a cathode input end is arranged on the metal cylinder, and the cathode input end is connected to the electrostatic high-voltage generator, and the electrostatic high-voltage generator is connected to the anode input end of the anode core rod. The output of the electrostatic high-voltage generator generates a high-voltage electrostatic magnetic field between the galvanized seamless steel pipe and the stainless steel pipe of the anode, and the incoming water is affected by the electrostatic field when it passes through the water inlet to the water outlet. Since water molecules are polar, under the action of the electrostatic field, polar water molecules are forced to arrange in a chain in the positive and negative order. Due to the orientation restrictions of the polar water molecules, the anions and cations in the water are surrounded by chain-like water molecule groups and cannot move freely, which prevents the accumulation and scaling of ions prone to scaling on the pipe walls and equipment walls. At the same time, the high-voltage electrostatic field ruptures and inactivates the microbial cells in the treated water, playing a bactericidal role. Moreover, due to the reduction in the concentration of ions prone to scaling around the pipe walls and equipment walls, the electrostatic field causes the oxygen atoms and hydroxide ions escaping from the water to gradually peel off the scale, thereby achieving the purpose of descaling. However, this descaling method has not been applied to heat exchange tubes.

[0004] Scaling of heat exchange tubes is a common problem in the evaporation process. During the scaling process, the heat exchange efficiency continues to decrease, and the evaporation capacity continues to decrease. If effective measures are not taken to prevent scaling, the equipment will quickly fail. Traditional chemical cleaning requires frequent periodic shutdowns, and the cleaning agents used are expensive, and will corrode the equipment and increase the environmental burden. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a high-pressure electrostatic anti-scaling system and method for a high-salt wastewater heat exchanger. The system and method can significantly slow down the scaling rate of the heat exchanger, improve the heat exchange efficiency, and do not use chemicals and increase the burden on the environment.

[0006] To achieve the above object, the present invention discloses a high-pressure static anti-scaling system for a high-salt wastewater heat exchanger, comprising a cathode housing, an intelligent controller and an evaporation concentration device heat exchanger;

[0007] The bottom of the cathode shell is provided with a plurality of water inlets, an anode is arranged in the cathode shell, a water outlet is arranged on the side of the top of the cathode shell, the intelligent controller is connected with the cathode shell and the anode, the water outlet is connected with the heat exchange pipe in the heat exchanger of the evaporation concentration device, and a steam inlet is arranged on the shell side of the heat exchanger of the evaporation concentration device.

[0008] The further improvement of the high-pressure static anti-scaling system for high-salt wastewater heat exchanger of the present invention is:

[0009] Furthermore, the anode includes an anode core rod, an anode protection layer and a polytetrafluoroethylene shrink tube insulation layer arranged on the outside of the anode core rod, the anode protection layer is located at the lower end of the anode core rod, and a wiring terminal is arranged at the upper end of the anode core rod, and the wiring terminal is connected to the intelligent controller.

[0010] Furthermore, the polytetrafluoroethylene shrink tube insulation layer and the anode core rod are processed in one piece.

[0011] Furthermore, the anode protection layer is fixed on the lower support in the cathode housing.

[0012] Furthermore, the upper end of the anode is fixed to an upper support in the cathode housing.

[0013] Furthermore, it also includes a high-voltage generator and a boost rectifier, wherein the high-voltage generator is connected to the intelligent controller via the boost rectifier.

[0014] Furthermore, the AC power output by the high-voltage generator is stepped up and rectified by the step-up rectifier into rated high-voltage DC power, and then output to the intelligent controller.

[0015] Furthermore, the water inlets are arranged in parallel.

[0016] Furthermore, it also includes a busbar system pipeline, which is connected to each water inlet.

[0017] The present invention discloses a high-pressure static anti-scaling method for a high-salt wastewater heat exchanger, which is implemented based on the static anti-scaling system for the high-salt wastewater heat exchanger. The high-pressure static anti-scaling method for the high-salt wastewater heat exchanger comprises the following steps:

[0018] High-salt wastewater enters the cathode housing. At the same time, the high-voltage direct current output by the intelligent controller acts on the cathode housing and the anode, forming an electrostatic field between the anode and the cathode housing. The high-pressure wastewater is converted into electrostatic water polarized by the electrostatic field under the action of the electrostatic field. The electrostatic water polarized by the electrostatic field enters the heat exchange tubes in the evaporation and concentration device heat exchanger. At the same time, low-temperature steam of 70°C to 90°C enters the shell side of the evaporation and concentration device heat exchanger. The ions of dissolved salt in the water in the heat exchange tubes are wrapped by water dipoles, so that they cannot contact the tube walls of the heat exchange tubes, preventing the formation of scale layers on the tube walls of the heat exchange tubes, and water molecules tend to the tube walls of the heat exchange tubes, further causing the original scale layers on the tube walls of the heat exchange tubes to gradually dissolve or crack and fall off.

[0019] The present invention has the following beneficial effects:

[0020] The high-pressure electrostatic anti-scaling system and method for high-salt wastewater heat exchanger of the present invention is specifically operated. When high-salt wastewater flows through the annular space between the anode and the cathode shell, polarization is generated under the action of the electrostatic field, so that the positive pole of the water dipole faces the cathode of the electrostatic field, and is neatly arranged in the order of positive and negative. After the positive and negative ions of the dissolved salt in the high-salt wastewater are surrounded by the above-mentioned water dipole, they cannot swim freely. Therefore, when the above-mentioned polarized electrostatic water enters the evaporation concentration device heat exchanger for heat exchange, the ions of the dissolved salt cannot contact the tube wall of the heat exchange tube, which effectively prevents the formation of a scale layer on the tube wall of the heat exchange tube, and the polarized electrostatic water, the water molecules tend to the tube wall of the heat exchange tube, causing the original scale layer to gradually crack and fall off. The present invention does not affect the normal operation of the inside of the evaporator, solves the problem of scaling of the evaporator, overcomes a series of problems caused by traditional chemical cleaning and descaling, and has low power consumption and good stability, thereby improving the competitiveness of the evaporator in the industries of high-salt wastewater treatment in power plants and desalination of seawater.

[0021] Furthermore, the insulating layer of the polytetrafluoroethylene shrink tube and the anode core rod are processed in one piece, and there is no gap between them. The polytetrafluoroethylene material can effectively reduce power loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 It is a structural diagram of the present invention.

[0024] Among them, 1 is the water inlet, 2 is the cathode shell, 3 is the anode core rod, 4 is the polytetrafluoroethylene shrink tube insulation layer, 5 is the anode protection layer, 6 is the intelligent controller, 7 is the high voltage generator, 8 is the boost rectifier, 9 is the water outlet, and 10 is the evaporation concentration device heat exchanger. DETAILED DESCRIPTION

[0025] 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 described embodiments are 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 creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0027] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0028] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0029] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0030] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0033] As is known, the evaporation concentration device is a device that uses thermal energy to drive and evaporate the water in the solution by heating, thereby achieving solute concentration. Its basic principle can be summarized into two main steps: evaporation and concentration. During the evaporation process, the water in the solution is converted into steam under heating conditions, and the steam is cooled by the condenser and becomes liquid water and is collected. During the concentration process, as the water evaporates, the concentration of the solute in the solution gradually increases, and finally a concentrated solution is obtained. The evaporation concentration device is generally composed of main parts such as a heater, an evaporator, a condenser and a liquid collector. The heater is responsible for providing thermal energy, the evaporator is the main place for the solution to evaporate, the condenser is used to condense the steam into liquid water, and the liquid collector is responsible for collecting condensed water and concentrated liquid. In addition, according to the specific application scenarios and requirements, the evaporation concentration device may also include other auxiliary components, such as a feeding system, a discharging system, a temperature control system, etc. The workflow of the evaporation concentration device usually includes the following steps: Initial stage: The solution to be treated is added to the evaporator through the feeding system to ensure that the solution is evenly distributed in the evaporator. Heating stage: The solution in the evaporator is heated by the heater to evaporate the water in the solution and form steam. In this process, the temperature in the evaporator gradually increases, promoting the evaporation of water. Separation stage: The steam enters the condenser through the pipe above the evaporator. In the condenser, the steam is condensed into liquid water by the action of cooling water or other cooling media, and discharged through the drainage system. Concentration stage: As the water evaporates, the concentration of the solution in the evaporator gradually increases, and finally achieves the desired concentration effect. The concentrated liquid is discharged through the discharging system and enters the subsequent processing link.

[0034] Embodiment 1

[0035] The high-pressure static anti-scaling system for a high-salt wastewater heat exchanger of the present invention comprises a cathode housing 2, an intelligent controller 6 and an evaporation concentration device heat exchanger 10; a plurality of water inlets 1 are provided at the bottom of the cathode housing 2, an anode is provided in the cathode housing 2, a water outlet 9 is provided on the side of the top of the cathode housing 2, the intelligent controller 6 is connected to the cathode housing 2 and the anode, the water outlet 9 is connected to the heat exchange pipe in the evaporation concentration device heat exchanger 10, and a steam inlet is provided on the shell side of the evaporation concentration device heat exchanger 10.

[0036] Accordingly, the present invention discloses a high-pressure static anti-scaling method for a high-salt wastewater heat exchanger. The high-pressure static anti-scaling method for a high-salt wastewater heat exchanger is implemented based on a high-pressure static anti-scaling system for a high-salt wastewater heat exchanger. The high-pressure static anti-scaling system for a high-salt wastewater heat exchanger includes a cathode housing 2, an intelligent controller 6, and an evaporation concentration device heat exchanger 10. Specifically, the static anti-scaling method for a high-salt wastewater heat exchanger includes the following steps: high-salt wastewater enters the cathode housing 2, and at the same time, the high-voltage direct current output by the intelligent controller 6 acts on the cathode housing 2 and the anode, and between the anode and the anode, An electrostatic field is formed between the cathode shells 2, and the high-pressure wastewater is converted into electrostatic water polarized by the electrostatic field under the action of the electrostatic field. The electrostatic water polarized by the electrostatic field enters the heat exchange tubes in the evaporation concentration device heat exchanger 10. At the same time, low-temperature steam of 70°C to 90°C enters the shell side of the evaporation concentration device heat exchanger 10. The ions of dissolved salts in the water in the heat exchange tubes are wrapped by water dipoles, so that they cannot contact the tube walls of the heat exchange tubes, preventing the formation of scale layers on the tube walls of the heat exchange tubes, and water molecules tend to the tube walls of the heat exchange tubes, further causing the original scale layers on the tube walls of the heat exchange tubes to gradually dissolve or crack and fall off.

[0037] Embodiment 2

[0038] refer to Figure 1 The high-pressure electrostatic anti-scaling system for a high-salt wastewater heat exchanger of the present invention comprises a water inlet 1, a cathode shell 2, an anode core rod 3, a polytetrafluoroethylene shrink tube insulation layer 4, an anode protection layer 5, an intelligent controller 6, a high-voltage generator 7, a boost rectifier 8, a water outlet 9, and an evaporation concentration device heat exchanger 10. The high-voltage generator 7 is connected to the intelligent controller 6 via the boost rectifier 8. The cathode shell 2 is provided with an anode core rod 3, an anode protection layer 5, and a polytetrafluoroethylene shrink tube insulation layer 4 arranged on the outside of the anode core rod 3. The anode protection layer 5 is located at the lower end of the anode core rod 3. The anode core rod 3 is connected to the positive electrode of the intelligent controller 6 via a first wire, and the cathode shell 2 is connected to the cathode of the intelligent controller 6 via a second wire.

[0039] As an embodiment of the present invention, a water inlet 1 is provided at the bottom of the cathode housing 2 for introducing high-salt wastewater, and a water outlet 9 on the top side of the cathode housing 2 is connected to the heat exchange tube in the evaporation concentration device heat exchanger 10, and a steam inlet is provided on the shell side of the evaporation concentration device heat exchanger 10.

[0040] As an embodiment of the present invention, Figure 1 As shown, the high voltage generator 7 boosts and rectifies the input 220V, 50Hz AC power into rated high voltage DC power through the boost rectifier 8, and outputs it to the intelligent controller 6. The positive pole of the intelligent controller 6 is connected to the anode core rod 3, and the negative pole of the intelligent controller 6 is connected to the cathode shell 2.

[0041] As an embodiment of the present invention, the anode is composed of an anode core rod 3, a polytetrafluoroethylene shrink tube insulation layer 4 and an anode protection layer 5, wherein the polytetrafluoroethylene shrink tube insulation layer 4 and the anode core rod 3 are processed as one piece, and there is no gap between the two. The polytetrafluoroethylene material can effectively reduce the power loss. The anode protection layer 5 is sleeved on the outside of the bottom of the anode core rod 3 and the polytetrafluoroethylene shrink tube insulation layer 4, the lower part of the anode is fixed to the lower bracket in the cathode housing 2 through the anode protection layer 5, and the upper part of the anode is fixed to the upper bracket in the cathode housing 2. The upper end of the anode core rod 3 is equipped with a terminal, and the DC high voltage electricity after boosting and rectification is applied to the terminal of the anode core rod 3 and the cathode housing 2 to generate a high-voltage electrostatic field.

[0042] As an embodiment of the present invention, it should be noted that the intelligent controller 6 provides the required electrostatic field to the anode and cathode through the data fed back by the matching temperature and flow measurement devices, so as to achieve the purpose of automatic control.

[0043] Accordingly, the present invention discloses a high-pressure static anti-scaling method for a high-salt wastewater heat exchanger. The high-pressure static anti-scaling method for a high-salt wastewater heat exchanger is implemented based on a high-pressure static anti-scaling system for a high-salt wastewater heat exchanger. The static anti-scaling system for a high-salt wastewater heat exchanger comprises a water inlet 1, a cathode shell 2, an anode core rod 3, a polytetrafluoroethylene shrink tube insulation layer 4, an anode protection layer 5, an intelligent controller 6, a high-voltage generator 7, a boost rectifier 8, a water outlet 9, and an evaporation concentration device heat exchanger 10. Specifically, the static anti-scaling method for a high-salt wastewater heat exchanger comprises the following steps:

[0044] During operation, the high-salinity wastewater to be treated flows into each water inlet 1 through a busbar system pipeline. Each water inlet 1 is arranged in parallel in multiple ways. The number of parallel ways is determined according to the required amount of water to be treated, and a modular layout is adopted. The damage of a single module does not affect the operation of the entire equipment, which is convenient for inspection and maintenance. After being treated in the annular space between the anode core rod 3 and the cathode housing 2, the high-salinity wastewater flows into the evaporation concentration device heat exchanger 10 through the water outlet 9 for subsequent evaporation and concentration.

[0045] The inside of the heat exchange tubes in the evaporation concentration device heat exchanger 10 is electrostatic water polarized by the electrostatic field, and low-temperature steam of 70°C to 90°C is introduced from the outside to achieve sufficient heat exchange between the two. The ions of dissolved salts in the water in the heat exchange tubes are wrapped by water dipoles and cannot contact the walls of the heat exchange tubes, preventing the formation of scale layers on the walls of the heat exchange tubes. Water molecules tend to the walls of the heat exchange tubes, which can further cause the original scale layers to gradually dissolve or crack and fall off.

[0046] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0047] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0048] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A high-pressure static anti-scaling system for a high-salinity wastewater heat exchanger, characterized in that: It comprises a cathode housing (2), an intelligent controller (6) and an evaporation concentration device heat exchanger (10); The bottom of the cathode housing (2) is provided with a plurality of water inlets (1), an anode is arranged in the cathode housing (2), a water outlet (9) is arranged on the side of the top of the cathode housing (2), an intelligent controller (6) is connected to the cathode housing (2) and the anode, the water outlet (9) is connected to a heat exchange pipe in a heat exchanger (10) of an evaporation concentration device, and a steam inlet is arranged on the shell side of the heat exchanger (10) of the evaporation concentration device.

2. The high-pressure static anti-scaling system for high-salt wastewater heat exchanger according to claim 1 is characterized in that: The anode comprises an anode core rod (3), an anode protection layer (5), and a polytetrafluoroethylene shrink tube insulation layer (4) arranged on the outside of the anode core rod (3), the anode protection layer (5) is located at the lower end of the anode core rod (3), and a wiring terminal is arranged at the upper end of the anode core rod (3), and the wiring terminal is connected to an intelligent controller (6).

3. The high-pressure static anti-scaling system for high-salt wastewater heat exchanger according to claim 2 is characterized in that: The polytetrafluoroethylene shrink tube insulation layer (4) and the anode core rod (3) are processed in one piece.

4. The anti-scaling system for high-salt wastewater heat exchanger according to claim 2, characterized in that: The anode protection layer (5) is fixed on the lower support inside the cathode housing (2).

5. The high-pressure static anti-scaling system for high-salt wastewater heat exchanger according to claim 2, characterized in that: The upper end of the anode is fixed on an upper support inside the cathode housing (2).

6. The high-pressure static anti-scaling system for high-salt wastewater heat exchanger according to claim 1, characterized in that: It also includes a high-voltage generator (7) and a boost rectifier (8), wherein the high-voltage generator (7) is connected to the intelligent controller (6) via the boost rectifier (8).

7. The high-pressure static anti-scaling system for high-salt wastewater heat exchanger according to claim 6, characterized in that: The alternating current output by the high-voltage generator (7) is stepped up and rectified by the step-up rectifier (8) into rated high-voltage direct current, which is then output to the intelligent controller (6).

8. The high-pressure static anti-scaling system for high-salt wastewater heat exchanger according to claim 5, characterized in that: The water inlets (1) are arranged in parallel.

9. The high-pressure static anti-scaling system for high-salt wastewater heat exchanger according to claim 8, characterized in that: It also includes a busbar system pipeline, which is connected to each water inlet (1).

10. A high-pressure static anti-scaling method for a high-salinity wastewater heat exchanger, characterized in that: The high-pressure static anti-scaling system for a high-salt wastewater heat exchanger according to claim 1 comprises the following steps: High-salinity wastewater enters the cathode housing (2). At the same time, the high-voltage direct current output by the intelligent controller (6) acts on the cathode housing (2) and the anode, forming an electrostatic field between the anode and the cathode housing (2). The high-pressure wastewater is converted into electrostatic water polarized by the electrostatic field under the action of the electrostatic field. The electrostatic water polarized by the electrostatic field enters the heat exchange tube in the evaporation concentration device heat exchanger (10). At the same time, low-temperature steam at 70°C to 90°C enters the shell side of the evaporation concentration device heat exchanger (10). The ions of dissolved salt in the water in the heat exchange tube are wrapped by water dipoles, so that they cannot contact the wall of the heat exchange tube, thereby preventing the formation of a scale layer on the wall of the heat exchange tube. In addition, water molecules tend to the wall of the heat exchange tube, further causing the original scale layer on the wall of the heat exchange tube to gradually dissolve or crack and fall off.

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