Energy-saving heat exchange circulating device for chlorate production

Abstract

The present application relates to chlorate production heat exchange equipment technical field, specifically to a kind of energy-saving heat exchange circulating device for chlorate production, it includes heat exchange unit one, heat exchange unit one includes hollow shell cylinder, the shell cylinder is separated into sealed heat exchange cavity, inflow cavity, outflow cavity, inflow cavity is communicated with the output valve port of communication crystallizer, outflow cavity is communicated with the input valve port of communication crystallizer, the barrel wall of heat exchange cavity two ends are communicated electrolytic tank output valve port and input valve port respectively, low-temperature plate way includes plate tube, several hollow plate tubes are provided in heat exchange cavity, the pipeline two ends of plate tube are communicated inflow cavity and outflow cavity respectively, several plate tubes are arranged in heat exchange cavity with interval, the pipe wall of plate tube is covered with a layer of heat storage layer, the present application solves the technical problem of electrolyte and crystallization liquid circulation heat exchange in chlorate production.

Description

Technical Field

[0001] This invention relates to the technical field of heat exchange equipment for chlorate production, and more specifically, to an energy-saving heat exchange circulation device for chlorate production. Background Technology

[0002] Chlorates (such as sodium chlorate and potassium chlorate) are important inorganic chemical raw materials. Industrially, they are mainly produced by electrolysis. Sodium chlorate is generated by electrolysis of refined sodium chloride brine in an electrolytic cell, followed by evaporation, crystallization, centrifugation, drying, and packaging to obtain the finished product.

[0003] However, in the chlorate production process, the electrolysis reaction is a strongly exothermic process, with about 30% to 50% of the electrical energy being converted into reaction heat, raising the electrolyte temperature to about 80°C. To maintain the stability of the electrolysis reaction, excess heat must be continuously removed; otherwise, uncontrolled tank temperature will accelerate side reactions, damage electrodes, and lead to a decrease in current efficiency. In the crystallization process, the saturated liquid undergoes vacuum low-temperature evaporation and crystallization in the crystallizer (temperature about 30 to 40°C), and needs to be heated to about 50 to 70°C by a heater (using boiler steam) before returning to the crystallizer to meet the heating requirements for flash boiling.

[0004] In traditional chlorate production, excess heat from the electrolysis system is usually carried away by cooling water through a heat exchanger and discharged into a cooling tower, while the crystallization system still requires boiler steam heating. This separate heating or cooling mode results in double energy waste.

[0005] Furthermore, during chlorate crystallization heat exchange, saturated liquid easily precipitates crystals on the heat exchanger walls (shell-and-tube, coil, and plate heat exchangers), forming a scale layer. This scale layer has a much higher thermal resistance than the metal wall surface (up to 10 to 100 times), severely hindering heat exchange, leading to a sharp decline in heat exchange efficiency, increased equipment wear, and more frequent maintenance. Especially when the heat exchanger wall temperature fluctuates with the heat source temperature, localized supercooling exacerbates crystal nucleation and precipitation, making the crystallization blockage problem even more severe. Summary of the Invention

[0006] The purpose of this invention is to provide an energy-saving heat exchange circulation device for chlorate production, which solves the technical problem of circulating heat exchange between electrolyte and crystallization liquid in chlorate production.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following solution:

[0008] An energy-saving heat exchange circulation device for chlorate production includes a heat exchange unit.

[0009] The heat exchange unit includes a hollow shell, the interior of which is divided into a sealed heat exchange chamber, an inlet chamber, and an outlet chamber. The inlet chamber is connected to the output valve of the crystallizer, and the outlet chamber is connected to the input valve of the crystallizer.

[0010] The two ends of the heat exchange chamber's cylindrical wall are respectively connected to the electrolytic cell's output valve port and input valve port.

[0011] The low-temperature plate channel includes plate-shaped tubes, and several hollow plate-shaped tubes are arranged inside the heat exchange cavity. The two ends of the plate-shaped tubes are respectively connected to the inlet cavity and the outlet cavity.

[0012] Several plate-shaped tubes are arranged with gaps between them inside the heat exchange chamber.

[0013] The plate-shaped tube has a heat storage layer wrapped in its wall interlayer.

[0014] One end of the heat exchange chamber wall is connected to an electrolyte output pipe, which is connected to the electrolytic cell input valve and the heat exchange unit.

[0015] The second heat exchange unit is configured as a hollow cylindrical shape, with the interior of the cylinder divided into a sealed heat absorption chamber, a liquid inlet chamber, and a liquid outlet chamber. The liquid inlet chamber is connected to the first electrolyte output pipe, and the liquid outlet chamber is connected to the input valve port of the electrolytic cell.

[0016] The heat absorption chamber is equipped with several coils, and the two ends of the coils are connected to the liquid inlet chamber and the liquid outlet chamber, respectively.

[0017] The two ends of the heat absorption chamber are connected to a coolant inlet pipe and a coolant outlet pipe, respectively.

[0018] A temperature sensor is fixedly installed on one of the electrolyte output pipes, and the sensing end of the temperature sensor is located in the heat exchange chamber space.

[0019] The electrolyte output pipe is equipped with two electrically controlled liquid valves on the two pipes that connect the electrolytic cell and the heat exchange unit. The temperature sensor is electrically connected to the two electrically controlled liquid valves respectively.

[0020] The heat storage layer is configured as a PCM layer.

[0021] Several baffles are fixedly installed inside the heat exchange cavity. The baffles are arranged along the length of the heat exchange cavity wall, and adjacent baffles are fixed at the top and bottom of the heat exchange cavity wall, respectively.

[0022] The area of ​​the flow-blocking plate is smaller than the diameter of the shell.

[0023] It is worth noting that the baffle plate is fixed inside the heat exchange chamber wall by the support column, and the low temperature plate channel is fixedly installed through the baffle plate.

[0024] The temperature sensor is equipped with a temperature threshold signal.

[0025] When the temperature sensor does not send a temperature threshold signal, the electro-hydraulic valve on the electrolyte output pipe one corresponding to the electrolytic cell is in the open state, and the electro-hydraulic valve on the electrolyte output pipe one corresponding to the heat exchange unit two is in the closed state.

[0026] When the temperature sensor sends a temperature threshold signal, the electro-hydraulic valve on the electrolyte output pipe one corresponding to the electrolytic cell is in a closed state, and the electro-hydraulic valve on the electrolyte output pipe one corresponding to the heat exchange unit two is in an open state.

[0027] The electrolyte inlet pipe is located at the top of the heat exchange chamber wall, and the electrolyte outlet pipe is located at the bottom of the heat exchange chamber wall.

[0028] The gap between adjacent plate-shaped pipes extends toward the opening of the electrolyte inlet pipe, which is connected to the outlet valve of the electrolytic cell.

[0029] The technical solution of this application has at least the following advantages and beneficial effects:

[0030] This invention establishes a heat exchange unit 1, in which a low-temperature crystallizing liquid flows through an internal low-temperature plate channel, while a high-temperature electrolyte flows through an external heat exchange cavity. This achieves heat exchange while reducing the occurrence of crystallization adhesion during transport. In addition, a heat storage layer capable of phase change and heat absorption is coated inside the low-temperature plate channel to maintain the temperature stability of the flow space. This makes the internal crystallizing liquid less susceptible to the influence of external temperature fluctuations in the electrolyte, further reducing the occurrence of crystallization adhesion caused by temperature fluctuations.

[0031] This invention, by incorporating a second heat exchange unit and a temperature sensor, automatically controls the entry of the electrolyte into the electrolytic cell or the second heat exchange unit based on the temperature of the electrolyte discharged from the first heat exchange unit. When the discharged electrolyte reaches the required temperature, it is directly discharged into the electrolytic cell. If the discharged electrolyte does not reach the required temperature, it is discharged back into the second heat exchange unit. The electrolyte flows into the coil, while the cooling medium, located in the external heat absorption chamber, rapidly absorbs heat from the electrolyte to cool it, heating the cooling medium, and then the electrolyte is discharged into the electrolytic cell, thus improving the heat exchange recycling efficiency. (See attached figures.)

[0032] Figure 1 This is a schematic diagram of the structure of the present invention.

[0033] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0034] Figure 3 This is a cross-sectional view of the heat exchange unit 1 of the present invention. Figure 1 .

[0035] Figure 4This is a cross-sectional view of the heat exchange unit 1 of the present invention. Figure 2 .

[0036] Figure 5 This is a schematic cross-sectional view of the low-temperature plate channel of the present invention. Figure 1 .

[0037] Figure 6 This is a schematic cross-sectional view of the low-temperature plate channel of the present invention. Figure 2 .

[0038] Figure 7 This is a top view of the structure of the present invention.

[0039] Figure 8 This is a cross-sectional view of the second heat exchange unit of the present invention. Figure 1 .

[0040] Figure 9 This is a cross-sectional view of the second heat exchange unit of the present invention. Figure 2 .

[0041] Figure 10 This is a cross-sectional view of the coil structure of the present invention. Figure 1 .

[0042] Figure 11 This is a cross-sectional view of the coil structure of the present invention. Figure 2 .

[0043] In the diagram: 1-Heat exchange unit one, 11-Shell, 111-Heat exchange cavity, 112-Inlet cavity, 113-Outlet cavity, 12-Low temperature plate channel, 121-Plate tube, 122-Heat storage layer, 13-Baffle plate, 131-Support column, 2-Crystallization liquid inlet pipe, 3-Crystallization liquid outlet pipe, 4-Electrolyte inlet pipe, 5-Electrolyte outlet pipe one, 6-Heat exchange unit two, 61-Heat absorption cavity, 611-Inlet cavity, 612-Outlet cavity, 62-Coil, 7-Coolant inlet pipe, 8-Coolant outlet pipe, 9-Electrolyte outlet pipe two. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. The terms "center," "upper," "lower," "inner," and "outer," indicating orientation or positional relationships based on the orientation or positional relationships shown in the figures, or the orientation or positional relationships commonly used when the product is in use, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation on this application. It should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] Example

[0047] Please refer to Figures 1-11 This embodiment provides an energy-saving heat exchange circulation device for chlorate production, which is used to exchange heat between the high-temperature electrolyte and the low-temperature crystallizing liquid generated during the chlorate production process. The electrolyte is cooled down and returned to the electrolytic cell to maintain the electrolysis temperature of the electrolytic cell, and the crystallizing liquid is heated up and returned to the crystallizer to meet the heating requirements of the crystallization process. It includes a heat exchange unit 1 that is connected to the electrolytic cell and the crystallizer respectively, and is used to pass the high-temperature electrolyte and the low-temperature crystallizing liquid into the heat exchange unit 1.

[0048] The heat exchange unit 1 includes a shell 11, a low-temperature plate channel 12, and a baffle plate 13.

[0049] For details, please refer to Figure 2 and Figure 3 In this embodiment, the shell 11 is configured as a sealed hollow cylinder. The internal space of the shell 11 is divided into three sealed cavities by the shell plate, namely the heat exchange cavity 111, the inlet cavity 112, and the outlet cavity 113. The inlet cavity 112 and the outlet cavity 113 are both located at one end of the shell 11. The inlet cavity 112 is fixedly connected to one end of the crystallization liquid input pipe 2, and the other end of the crystallization liquid input pipe 2 is connected to the output valve port of the crystallizer, which is used to introduce the low-temperature crystallization liquid in the crystallizer into the inlet cavity 112. The outlet cavity 113 is fixedly connected to one end of the crystallization liquid output pipe 3, and the other end of the crystallization liquid output pipe 3 is connected to the input valve port of the crystallizer, which is used to introduce the heated crystallization liquid into the crystallizer to continue the crystallization process.

[0050] The heat exchange chamber 111 is fixedly equipped with a low-temperature plate channel 12. The low-temperature plate channel 12 is plate-shaped and hollow inside. The two ends of the low-temperature plate channel 12 are connected to the inlet cavity 112 and the outlet cavity 113, respectively, so that the crystallizing liquid flows through the heat exchange chamber 111. The heat exchange chamber 111 is filled with high-temperature electrolyte, which can quickly heat up the incoming low-temperature crystallizing liquid and then output it to the outlet cavity 113 to complete the heat exchange.

[0051] Specifically, the two ends of the heat exchange chamber 111 are connected to the electrolyte inlet pipe 4 and the electrolyte outlet pipe 5, respectively. The other end of the electrolyte inlet pipe 4 is connected to the outlet valve of the electrolytic cell, and the electrolyte outlet pipe 5 is connected to the inlet valve of the electrolytic cell. The electrolyte outlet pipe 5 is used to input the high-temperature electrolyte into the heat exchange chamber 111, exchange heat with the crystallization liquid, cool down, and then be reintroduced into the electrolytic cell.

[0052] In order to increase the residence time of the electrolyte in the heat exchange chamber 111 and fully exchange heat to the crystallizing liquid, several baffles 13 are fixedly installed in the heat exchange chamber 111. The electrolyte inlet pipe 4 and the electrolyte outlet pipe 5 are respectively installed at both ends of the length of the heat exchange chamber 111 cylinder wall. The baffles 13 are arranged along the length of the heat exchange chamber 111 cylinder wall, and adjacent baffles 13 are fixed at the top and bottom of the heat exchange chamber 111 cylinder wall. The area of ​​the baffles 13 is smaller than the diameter of the shell cylinder 11, thereby forming an "S" shaped channel in the length direction of the heat exchange chamber 111, which prolongs the flow time of the input high-temperature electrolyte in the heat exchange chamber 111 and improves the heat exchange effect.

[0053] It is worth noting that the baffle plate 13 is fixed inside the cylinder wall of the heat exchange chamber 111 by the support column 131, and the low temperature plate channel 12 is fixedly inserted through the baffle plate 13. On the one hand, it is fixed by the baffle plate 13, and on the other hand, the plate-shaped baffle plate 13 can also conduct heat to the low temperature plate channel 12, thereby improving the heat exchange effect.

[0054] It is worth noting that the electrolyte inlet pipe 4 is located at the top of the cylinder wall of the heat exchange chamber 111, and the electrolyte outlet pipe 5 is located at the bottom of the cylinder wall of the heat exchange chamber 111, which facilitates the smooth input and output of the electrolyte.

[0055] Traditional heat exchangers typically introduce a highly fluid, low-temperature medium into the heat exchange chamber 111, followed by a high-temperature fluid through pipes running through the chamber. The low-temperature medium completely envelops the high-temperature pipes to achieve rapid cooling and heat exchange. However, in this embodiment, if a high-temperature electrolyte is introduced into the low-temperature plate channel 12 and a low-temperature crystallizing liquid is introduced into the heat exchange chamber 111, while the electrolyte can cool down quickly, the low-temperature crystallizing liquid in the heat exchange chamber 111 heats up slowly after heat exchange. Because the low-temperature crystallizing liquid remains unsaturated at low temperatures, it continues to crystallize. When the temperature rises too slowly and the crystallizing liquid remains in the heat exchange chamber 111 for too long, the crystals adhere to the inner wall of the heat exchange chamber 111 and the pipe walls. Over time, this accumulation of crystals forms a scale layer, severely affecting the heat exchange efficiency within the heat exchange chamber 111 and hindering heat transfer. Therefore, it is necessary to periodically remove the scale from the heat exchange chamber 111 or replace the inner walls and pipes.

[0056] Preferably, in this embodiment, the low-temperature crystallizing liquid is introduced into the low-temperature plate channel 12, and the high-temperature electrolyte is introduced into the heat exchange chamber 111. The high-temperature electrolyte fully encapsulates the low-temperature crystallizing liquid, so that after the low-temperature crystallizing liquid enters the heat exchange unit 1, it can be rapidly heated, making it difficult for crystals in the low-temperature crystallizing liquid to precipitate and adhere to the inside of the low-temperature plate channel 12, reducing the formation of scale during the heat exchange process and maintaining a long-term heat exchange effect.

[0057] Furthermore, in order to improve the heat exchange effect, the low-temperature plate channel 12 includes a plate-shaped tube 121 and a heat storage layer 122.

[0058] Please refer to Figures 3-6 In this embodiment, a plurality of plate-shaped tubes 121 are provided in the heat exchange chamber 111. The plate-shaped tubes 121 are U-shaped and hollow inside. The two ends of the U-shaped tubes 121 are fixedly connected to the inlet chamber 112 and the outlet chamber 113 respectively for transporting crystallizing liquid. The plurality of plate-shaped tubes 121 are arranged in the heat exchange chamber 111 with gaps. The gap space between adjacent plate-shaped tubes 121 extends towards the electrolyte input pipe 4 (i.e., the top of the cylinder wall of the heat exchange chamber 111), so that the high-temperature electrolyte entering the heat exchange chamber 111 from the electrode liquid input pipe can be evenly distributed to the gap space of the plurality of plate-shaped tubes 121 and uniformly exchange heat with the plate surface of each plate-shaped tube 121.

[0059] It is worth noting that because the heat release of the electrolyte inside the electrolytic cell is irregular, the high temperature generated by the electrolyte is prone to fluctuation. When the electrolyte with fluctuating temperature enters the heat exchange chamber 111, the temperature conducted to the plate tube 121 will also fluctuate continuously. The crystallizing liquid transported in the plate tube 121 is also prone to partial crystallization due to temperature fluctuations. Therefore, in actual application, even if the low temperature crystallizing liquid is wrapped with high temperature electrolyte, crystals will still remain in the plate tube 121, causing scaling and clogging of the channel.

[0060] To address the aforementioned issues, in this embodiment, the tube wall interlayer of the plate-shaped tube 121 is covered with a heat storage layer 122. The heat storage layer 122 is configured as a PCM layer, which can undergo a phase change at high temperatures to store heat.

[0061] Preferably, when the high-temperature electrolyte enters the heat exchange chamber 111, its heat will be quickly absorbed by the PCM layer in the interlayer of the plate tube 121. The PCM layer absorbs heat and undergoes a phase change to store heat. Because the temperature of the PCM layer stabilizes at a certain peak during the phase change, a heat storage layer 122 with a relatively stable temperature can be wrapped around the outside of the plate tube 121 channel. This makes the internal crystallizing liquid less susceptible to the influence of the external electrolyte, which is prone to temperature fluctuations. The external electrolyte will also be continuously absorbed by the "heat trap" generated by the heat storage layer 122, further accelerating the cooling process.

[0062] It is worth noting that in this embodiment, the PCM layer is preferably set as a paraffin-based composite phase change material with a phase change temperature of about 50°C and a latent heat of phase change of up to 150 J / kg. The electrolyte temperature after the electrolytic reaction is generally around 80°C, while the temperature of the saturated liquid in the crystallizer during vacuum low-temperature evaporation and crystallization is about 30-40°C. It needs to be heated to about 50-70°C by a heater before returning to the crystallizer to meet the heating requirements for flash boiling. When the initial temperature of the electrolyte is too high, the PCM layer melts from a solid state to a liquid state and solidifies, absorbing the latent heat of phase change, maintaining the plate tube 121 in the initial stage. The temperature is stabilized at around 50℃, and then heat is continuously stored. After the latent heat that the PCM layer can absorb is exceeded, the plate tube 121 will slowly rise to the range of 60-70℃. The temperature fluctuation is not easy to occur during the whole process. When the electrolyte temperature drops due to fluctuation, the PCM layer solidifies from liquid to solid, releasing the latent heat of phase change. This will continuously maintain the temperature of the inner wall of the plate tube 121 channel at around 50℃, without excessive cooling. This prevents the temperature of the crystallizing liquid inside the plate tube 121 from changing significantly with the temperature fluctuation of the external electrolyte, reducing the occurrence of crystal precipitation on the wall due to local supercooling of the crystallizing liquid.

[0063] It is worth noting that PCM refers to phase change material, which is a material that can absorb or release a large amount of latent heat by changing its state of matter (i.e., phase change) while maintaining a constant temperature. It is commonly used in the field of electronic heat dissipation equipment. In this embodiment, the paraffin-based composite phase change material is a phase change composite material formed by melting and mixing sliced ​​paraffin as the phase change material and expandable graphite as the matrix support material. The preparation method is as follows: after drying the sliced ​​paraffin, it is placed in a water bath and heated to 80°C to melt. Then, a certain amount of expanded graphite is added and stirred. After the expanded graphite fully adsorbs and dissolves the paraffin, the paraffin-based composite phase change material is obtained. The paraffin-based composite phase change material and its preparation method in this embodiment are both existing technologies, so the technical details will not be elaborated in this article.

[0064] Although the low-temperature plate channel 12 and the heat storage layer 122 are set to maintain a stable temperature rise of the crystallization liquid, the high-temperature electrolyte in the heat exchange chamber 111 has a large volume of heat exchange. Therefore, in the actual heat exchange process, the temperature drop of the electrolyte flowing through the electrolyte inlet pipe 4 through the heat exchange chamber 111 to the electrolyte outlet pipe 5 is not significant. After being transported back to the electrolytic cell, it is difficult to meet the long-term exothermic electrolytic reaction process, and the temperature will rise quickly again.

[0065] To solve the above problems, please refer to Figures 7-11 Electrolyte output pipe 1 is also connected to heat exchange unit 2 6. Heat exchange unit 2 6 is also a sealed hollow cylinder, forming three sealed spaces inside: heat absorption chamber 61, liquid inlet chamber 611, and liquid outlet chamber 612. Liquid inlet chamber 611 and liquid outlet chamber 612 are located at one end of the length of the hollow cylinder. Liquid inlet chamber 611 is fixedly connected to electrolyte output pipe 1 5, and liquid outlet chamber 612 is connected to one end of electrolyte output pipe 2 9. The other end of electrolyte output pipe 2 is also connected to the inlet of the electrolytic cell. Several U-shaped coils 62 are fixed inside the heat absorption chamber 61. The two ends of the coils 62 are connected to the liquid inlet chamber 611 and the liquid outlet chamber 612, respectively, so that the medium-temperature electrolyte in electrolyte output pipe 1 5 is input into several coils 62 and flows back to the electrolytic cell from electrolyte output pipe 2 9.

[0066] The heat absorption chamber 61 has a coolant inlet pipe 7 and a coolant outlet pipe 8 fixedly connected at both ends of its cylindrical wall. The coolant inlet pipe 7 is located at the top of the cylindrical wall, and the coolant outlet pipe 8 is located at the bottom of the cylindrical wall. The coolant inlet pipe 7 is connected to an external cooling medium pumping system (such as a domestic water storage tank), and the coolant outlet pipe 8 is connected to an external cooling medium pumping system (such as a domestic hot water storage tank). The cooling medium (such as domestic water at 20-30℃) is introduced into the cooling chamber and flows rapidly within it, contacting the surfaces of several coils 62. It exchanges heat with the medium-temperature electrolyte (at approximately 50-60℃) in the coils 62, resulting in a greater temperature drop in the electrolyte (at approximately 30-40℃). The electrolyte is then returned to the electrolytic cell through the electrode liquid outlet pipe 8 to carry out the electrolytic reaction. The cooling medium in the cooling chamber, after being heated (at approximately 40-50℃), is pumped from the coolant outlet pipe 8 into the domestic hot water storage tank to provide hot water for external factory workers, thus realizing the secondary utilization of the electrolyte waste heat.

[0067] Furthermore, since the electrolyte with a small temperature rise has reached the required temperature after passing through heat exchange unit one, it can be introduced into the electrolytic cell. If it is then introduced into heat exchange unit two 6, it will not only waste the entire heat exchange cycle time, but also make it difficult to heat the cooling medium in heat exchange unit two 6, thus failing to provide hot water.

[0068] To address the aforementioned issues, in this embodiment, a temperature sensor is fixedly installed on the electrolyte output pipe 5. The sensing end of the temperature sensor is located in the heat exchange chamber 111 and is used to sense the temperature of the electrolyte flowing out of the heat exchange chamber 111. Electrolyte-controlled liquid valves are installed on the two pipes of the electrolyte output pipe 5 that connect to the electrolytic cell and the heat exchange unit 6, respectively. The temperature sensor is electrically connected to the two electrolyte-controlled liquid valves, and a temperature threshold signal is set on the temperature sensor. Based on the electrolyte temperature output from the electrolyte output pipe 5, the electrolytic cell or the heat exchange unit 6 can be opened accordingly to optimize the efficiency of the entire heat exchange cycle.

[0069] The electro-controlled liquid valve on the electrolyte output pipe 5 corresponding to the electrolytic cell is normally open. When the temperature of the electrolyte discharged from the electrolyte output pipe 5 is consistently lower than the temperature sensing threshold of the temperature sensor (i.e., the electrolyte heat exchange cooling meets the standard), the temperature sensor does not send a signal, and the electro-controlled liquid valve on the electrolyte output pipe 5 corresponding to the heat exchange unit 6 is normally closed, allowing the discharged electrolyte to directly enter the electrolytic cell.

[0070] The electro-hydraulic valve on the electrolyte output pipe 5 corresponding to the electrolytic cell is normally open. When the temperature of the electrolyte discharged from the electrolyte output pipe 5 reaches the temperature sensing threshold of the temperature sensor (i.e., the electrolyte heat exchange cooling is not up to standard), the temperature sensor sends a signal to the two electro-hydraulic valves. The electro-hydraulic valve on the electrolyte output pipe 5 corresponding to the electrolytic cell closes, and the electro-hydraulic valve on the electrolyte output pipe 5 corresponding to the heat exchange unit 6 opens, so that the electrolyte that has not reached the cooling standard is passed into the heat exchange unit 6 to continue cooling, and is discharged back to the electrolytic cell from the electrolyte output pipe 9.

[0071] The various embodiments of the present invention have now been described in detail. To avoid obscuring the concept of the invention, some details known in the art have not been described. Those skilled in the art will fully understand how to implement the technical solutions of this invention based on the above description, and the scope of the invention is defined by the appended claims.

Claims

1. An energy-saving heat exchange circulation device for chlorate production, characterized in that, Including heat exchange unit one (1); The heat exchange unit (1) includes a hollow shell (11), the interior of which is divided into a sealed heat exchange chamber (111), an inlet chamber (112), and an outlet chamber (113). The inlet chamber (112) is connected to the output valve of the crystallizer, and the outlet chamber (113) is connected to the input valve of the crystallizer. The two ends of the cylinder wall of the heat exchange chamber (111) are respectively connected to the output valve port and the input valve port of the electrolytic cell; The low-temperature plate channel (12) includes a plate-shaped tube (121), and a plurality of hollow plate-shaped tubes (121) are provided in the heat exchange cavity (111). The two ends of the plate-shaped tube (121) are respectively connected to the inlet cavity (112) and the outlet cavity (113). Several plate-shaped tubes (121) are arranged with gaps in the heat exchange chamber (111); The tube wall interlayer of the plate tube (121) is covered with a heat storage layer (122).

2. The energy-saving heat exchange circulation device for chlorate production according to claim 1, characterized in that, The bottom of one end of the wall of the heat exchange chamber (111) is connected to an electrolyte output pipe (5), and the electrode liquid output pipe is connected to the electrolytic cell input valve and the heat exchange unit (6). The second heat exchange unit (6) is configured as a hollow cylindrical shape, and the inside of the cylindrical shape is divided into a sealed heat absorption chamber (61), a liquid inlet chamber (611) and a liquid outlet chamber (612). The liquid inlet chamber (611) is connected to the first electrolyte output pipe (5), and the liquid outlet chamber (612) is connected to the input valve port of the electrolytic cell. The heat absorption chamber (61) is provided with a number of coils (62), and the two ends of the coils (62) are respectively connected to the liquid inlet chamber (611) and the liquid outlet chamber (612). The two ends of the wall of the heat absorption chamber (61) are connected to the coolant inlet pipe (7) and the coolant outlet pipe (8), respectively.

3. The energy-saving heat exchange circulation device for chlorate production according to claim 1, characterized in that, A temperature sensor is fixedly installed on the electrolyte output tube (5), and the sensing end of the temperature sensor is located in the space of the heat exchange chamber (111). The electrolyte output pipe 1 (5) is connected to the two pipes of the electrolytic cell and the heat exchange unit 2 (6) respectively. Both pipes are equipped with electro-controlled liquid valves, and the temperature sensor is electrically connected to the two electro-controlled liquid valves respectively.

4. The energy-saving heat exchange circulation device for chlorate production according to claim 1, characterized in that, The heat storage layer (122) is configured as a PCM layer.

5. The energy-saving heat exchange circulation device for chlorate production according to claim 1, characterized in that, A number of baffle plates (13) are fixedly installed inside the heat exchange cavity (111). The baffle plates (13) are arranged along the length of the wall of the heat exchange cavity (111). Adjacent baffle plates (13) are fixed at the top and bottom of the wall of the heat exchange cavity (111). The area of ​​the flow-blocking plate (13) is smaller than the diameter of the shell (11); It is worth noting that the baffle plate (13) is fixed inside the cylinder wall of the heat exchange chamber (111) by the support column (131), and the low temperature plate channel (12) is fixedly installed through the baffle plate (13).

6. The energy-saving heat exchange circulation device for chlorate production according to claim 3, characterized in that, The temperature sensor is equipped with a temperature threshold signal; When the temperature sensor does not send a temperature threshold signal, the electro-hydraulic valve on the electrolyte output pipe (5) corresponding to the electrolytic cell is in the open state, and the electro-hydraulic valve on the electrolyte output pipe (5) corresponding to the heat exchange unit (6) is in the closed state. When the temperature sensor sends a temperature threshold signal, the electro-hydraulic valve on the electrolyte output pipe (5) corresponding to the electrolytic cell is in a closed state, and the electro-hydraulic valve on the electrolyte output pipe (5) corresponding to the heat exchange unit (6) is in an open state.

7. The energy-saving heat exchange circulation device for chlorate production according to claim 1, characterized in that, The electrolyte input pipe (4) is located at the top of the cylinder wall of the heat exchange chamber (111), and the electrolyte output pipe (5) is located at the bottom of the cylinder wall of the heat exchange chamber (111).

8. The energy-saving heat exchange circulation device for chlorate production according to claim 1, characterized in that, The gap space between adjacent plate-shaped tubes (121) extends toward the opening of the electrolyte input pipe (4), which is connected to the output valve of the electrolytic cell.

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