A dehydration kettle for processing wastewater in a monosodium salt production process

Abstract

This disclosure relates to the technical field of dehydration kettles. One embodiment of this disclosure provides a dehydration kettle for wastewater processing in the production of sodium monosodium phosphate. The kettle includes a lower kettle body, an upper kettle body, and several outer supports. All outer supports are fixed to the outside of the lower kettle body. The upper kettle body is mounted on the lower kettle body. A sealing assembly is disposed between the upper and lower kettle bodies. A dehydration heat exchange assembly is disposed between the upper and lower kettle bodies. The sealing assembly includes a sleeve, which is disposed around the top of the lower kettle body. A boss is provided around the bottom of the upper kettle body, and the upper kettle body is vertically inserted into the sleeve through the boss. Each outer support has a bottom groove. This technical solution solves the problem that existing dehydration kettles are generally closed, integral structures, making it inconvenient to open and clean the interior.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the technical field of dehydration kettles, specifically to a dehydration kettle for wastewater processing in the production of monosodium salts. Background Technology

[0002] In the production process of monosodium salts (such as sodium chloride and sodium sulfate), the wastewater contains a large amount of dissolved salt and a small amount of solid impurities. It needs to be dehydrated in a dehydration reactor to remove water, achieving wastewater reduction and salt resource recovery, laying the foundation for subsequent salt purification or wastewater discharge meeting standards. The structural convenience and functional integrity of the dehydration reactor used for processing wastewater from monosodium salt production directly determine the wastewater treatment efficiency and resource recovery effect. With the increase in monosodium salt production capacity and increasingly stringent environmental requirements, the shortcomings of traditional dehydration reactors have become increasingly apparent: existing dehydration reactors are generally closed, integral structures, making it inconvenient to open them for internal cleaning, and they lack integrated heat exchange, which not only leads to difficult equipment maintenance but also restricts dehydration efficiency, making it difficult to meet the needs of efficient and stable wastewater processing.

[0003] Traditional dehydration reactors typically employ a sealed design with a small-diameter top inlet and a bottom outlet. After prolonged treatment of high-salt wastewater, the inner wall of the reactor easily accumulates scale, impurities, and sediment, even clogging the internal flow channels. Cleaning requires disassembling multiple components such as the reactor flange and pipe connections, which is cumbersome and time-consuming. Frequent disassembly can also lead to wear on the seals and leakage. Furthermore, the dehydration process requires heating to promote water evaporation or cooling to control salt crystallization. However, traditional dehydration reactors lack an internal heat exchange structure and rely on external heating / cooling equipment to indirectly regulate the internal temperature. This results in low heat transfer efficiency and uneven temperature distribution within the reactor, leading to insufficient localized water evaporation or salt crystallization, affecting the dehydration effect and the purity of subsequent salt recovery.

[0004] Therefore, the development of a dehydration autoclave for processing wastewater from monosodium salt production that is easy to open and clean and integrates heat exchange functions has become an urgent need to improve wastewater treatment efficiency and equipment practicality. Utility Model Content

[0005] To overcome the above-mentioned defects, the embodiments of this disclosure provide a dehydration kettle for wastewater processing in the production of sodium monosodium salt, which solves the technical problem that existing dehydration kettles are generally closed integral structures, making it inconvenient to open them for internal cleaning.

[0006] According to one aspect, at least one embodiment of this disclosure provides a dehydration kettle for wastewater processing in a monosodium salt production process, comprising: The vessel includes a lower vessel body, an upper vessel body, and several external supports. The external supports are all fixed to the outside of the lower vessel body, and the upper vessel body is mounted on the lower vessel body. A docking sealing assembly is disposed between the upper vessel body and the lower vessel body; A dehydration heat exchange assembly is disposed in the upper vessel body and the lower vessel body; The docking sealing assembly includes a sleeve, which is disposed around the top of the lower vessel body. A boss is provided around the bottom of the upper vessel body. The upper vessel body is vertically inserted into the sleeve through the boss. A bottom groove is provided at the bottom of each of the outer supports.

[0007] As a further technical solution, a telescopic cylinder is installed vertically upward in the bottom groove, and several connecting frames are arranged around the outer wall of the upper vessel. The output end of the telescopic cylinder is fixedly connected to the connecting frame.

[0008] According to another aspect, in at least one embodiment of the present invention, the dehydration heat exchange component includes an inner layer, which is disposed around the inner wall of the lower vessel, and a plurality of heating tubes are disposed in the inner layer, and a partition is disposed in the upper vessel.

[0009] As a further technical solution, an exhaust pipe is connected between the upper surface of the partition and the top of the upper vessel body, with the upper end of the exhaust pipe located outside the upper vessel body and the lower end of the exhaust pipe located at the bottom of the partition.

[0010] As a further technical solution, a gas collection hood is provided at the lower end of the exhaust pipe, heat exchange circulation pipes are provided at both ends of the outer wall of the upper vessel, and an vent pipe is provided on the outer wall of the upper vessel, with the vent pipe located at the upper end of the partition.

[0011] As a further technical solution, the exhaust pipe is spirally coiled inside the upper vessel body.

[0012] As a further technical solution, the bottom opening of the gas collection hood has a funnel-shaped structure.

[0013] As a further technical solution, a discharge pipe is provided at the bottom of the lower vessel, and a switch valve connection flange is provided at the lower end of the discharge pipe.

[0014] The beneficial effects of the embodiments disclosed herein are as follows: In this disclosure, the docking sealing assembly solves the problems of traditional dehydration kettles being entirely enclosed and difficult to clean through convenient lifting and reliable sealing design. The telescopic cylinder, in conjunction with the connecting frame, drives the upper kettle body to rise and fall smoothly, eliminating the need for manual handling or disassembly, thus reducing operational intensity. The precise nesting of the boss and the sleeve forms the main sealing structure, preventing steam or wastewater leakage during dehydration and ensuring operational safety. The outer support base provides a stable mounting foundation for the cylinder, and the symmetrical distribution of the connecting frame ensures balanced force on the upper kettle body, preventing tilting during lifting. This structure allows for quick opening and closing of the kettle body, and during cleaning, it can directly contact the inner and outer walls and partitions to thoroughly remove salt scale and sediment, preventing residue from affecting subsequent dehydration effects, significantly shortening maintenance time, and improving equipment usability and continuity. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0016] Figure 1 This is a schematic diagram of a structure in one embodiment of the present disclosure; Figure 2 This is an isometric drawing of the present disclosure; Figure 3 This is an isometric sectional view of the present disclosure; Figure 4 This is another isometric sectional view of this disclosure; Figure 5 Appendix to this disclosure Figure 5 Enlarged view of part A in the middle; In the diagram: 1. Lower vessel body; 2. Upper vessel body; 3. Outer support; 4. Butt sealing assembly; 4-1. Sleeve layer; 4-2. Boss; 4-3. Bottom groove; 4-4. Telescopic cylinder; 4-5. Connecting frame; 5. Dehydration heat exchange assembly; 5-1. Inner layer; 5-2. Heating tube; 5-3. Partition; 5-4. Exhaust pipe; 5-5. Gas collection hood; 5-6. Heat exchange circulation pipe; 5-7. Drain pipe; 6. Discharge pipe; 7. Switch valve connecting flange. Detailed Implementation

[0017] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0018] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0019] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0020] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0022] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] like Figures 1-5 As shown, it illustrates a dehydration kettle for wastewater processing in a monosodium salt production process according to an embodiment of this disclosure, comprising: The vessel consists of a lower vessel body 1, an upper vessel body 2, and several external supports 3. The external supports 3 are all fixed to the outside of the lower vessel body 1, and the upper vessel body 2 is mounted on the lower vessel body 1. A docking sealing assembly 4 is disposed between the upper vessel body 2 and the lower vessel body 1; Dehydration heat exchange component 5, wherein the dehydration heat exchange component 5 is disposed in the upper vessel body 2 and the lower vessel body 1; The docking sealing assembly 4 includes a sleeve 4-1, which is arranged around the top of the lower vessel 1. A boss 4-2 is provided around the bottom of the upper vessel 2. The upper vessel 2 is vertically inserted into the sleeve 4-1 through the boss 4-2. The bottom of the outer support 3 is provided with a bottom groove 4-3. A telescopic cylinder 4-4 is installed vertically upward in the bottom groove 4-3. A plurality of connecting brackets 4-5 are arranged around the outer wall of the upper vessel 2. The output end of the telescopic cylinder 4-4 is fixedly connected to the connecting bracket 4-5.

[0024] In some examples, in order to achieve rapid opening and closing and reliable sealing between the upper vessel 2 and the lower vessel 1, which facilitates cleaning and maintenance of the vessel interior after dehydration and prevents leakage during wastewater dehydration, a docking sealing assembly 4 is designed. This assembly includes a sleeve 4-1 around the top of the lower vessel 1 to provide a nesting installation reference for the upper vessel 2, and a boss 4-2 around the bottom of the upper vessel 2 that is precisely matched to the size of the sleeve 4-1. When the boss 4-2 is inserted vertically downward into the sleeve 4-1, a preliminary sealing structure can be formed to prevent wastewater or steam from leaking from the docking point of the upper and lower vessel 1. An elastic sealing element (such as a heat-resistant rubber ring) can be added to the inner wall of the sleeve 4-1 to further enhance the sealing effect and prevent high-temperature steam from escaping from the gaps.

[0025] The bottom groove 4-3 of the outer support 3 provides vertical installation space for the telescopic cylinder 4-4, ensuring that the axis of the cylinder output end is consistent with the lifting direction of the upper vessel 2. The output end of the telescopic cylinder 4-4 is fixedly connected to the connecting frame 4-5 around the outer wall of the upper vessel 2. The connecting frame 4-5 is symmetrically distributed on the outside of the upper vessel 2, which can evenly transmit the driving force of the cylinder to the upper vessel 2, and avoid the upper vessel 2 from tilting due to uneven force when it is lifted.

[0026] When it is necessary to clean the inside of the vessel, the telescopic cylinder 4-4 extends to push the connecting frame 4-5 to rise synchronously with the upper vessel 2, so that the boss 4-2 disengages from the sleeve 4-1, and the upper vessel 2 is lifted smoothly. The operator can then directly clean the bottom of the lower vessel 1, the inner layer 5-1, and the partition 5-3 of the upper vessel 2. After cleaning, the telescopic cylinder 4-4 shortens to drive the upper vessel 2 to descend, and the boss 4-2 is reinserted into the sleeve 4-1 to complete the sealing connection.

[0027] The bottom groove 4-3 secures the telescopic cylinder 4-4, ensuring its stable operation and preventing cylinder wobbling from affecting the lifting accuracy of the upper vessel 2. The rigid structure of the connecting frame 4-5 can withstand the weight of the upper vessel 2, preventing deformation after long-term use. The nested design of the boss 4-2 and the sleeve 4-1 also serves as a positioning function, ensuring that the upper vessel 2 can be precisely aligned with the lower vessel 1 after each descent, without the need for additional adjustments.

[0028] During operation, the cylinder drives the upper vessel 2 to open and close, and the nested structure ensures a seal, meeting the dual requirements of wastewater dewatering and subsequent cleaning.

[0029] like Figures 1-5 As shown in the figure, the dehydration heat exchange component 5 proposed in this embodiment includes an inner layer 5-1, which is disposed around the inner wall of the lower vessel 1. A plurality of heating tubes 5-2 are disposed in the inner layer 5-1. A partition 5-3 is disposed inside the upper vessel 2. An exhaust pipe 5-4 is connected between the upper surface of the partition 5-3 and the top of the upper vessel 2. The upper end of the exhaust pipe 5-4 is located outside the upper vessel 2, and the lower end of the exhaust pipe 5-4 is located at the bottom of the partition 5-3. A gas collection hood 5-5 is disposed at the lower end of the exhaust pipe 5-4. Heat exchange circulation pipes 5-6 are disposed at both ends of the outer wall of the upper vessel 2. An vent pipe 5-7 is disposed on the outer wall of the upper vessel 2, and the vent pipe 5-7 is located at the upper end of the partition 5-3.

[0030] In some examples, in order to achieve stable dehydration and efficient energy utilization of sodium salt wastewater, ensuring continuous controllability of the wastewater dehydration process and reducing energy consumption by recovering waste heat from steam through heat exchange, a dehydration heat exchange component 5 was designed. This component includes an inner layer 5-1 around the inner wall of the lower vessel 1, which provides an installation and protection carrier for the heating tubes 5-2. Several heating tubes 5-2 are evenly distributed in the inner layer 5-1, which can transfer heat to the wastewater in the lower vessel 1 through heat conduction, raising the wastewater temperature to the boiling point, causing the water to evaporate and form steam, thus completing the dehydration process. The inner layer 5-1 also prevents the wastewater from directly contacting the heating tubes 5-2, reducing scaling or corrosion of the heating tubes 5-2 and extending their service life.

[0031] The partition 5-3 inside the upper vessel 2 divides the internal space of the upper vessel 2 into upper and lower parts. The lower part of the partition 5-3 is the steam collection area, and the upper part is the heat exchange and exhaust channel. The exhaust pipe 5-4 connected between the upper surface of the partition 5-3 and the top of the upper vessel 2 has a gas collection hood 5-5 at its lower end, which can collect the steam generated by the evaporation of the lower vessel 1 and guide the steam to flow upward along the exhaust pipe 5-4 to avoid the steam from spreading disorderly in the vessel.

[0032] The heat exchange circulation pipes 5-6 at both ends of the outer wall of the upper vessel 2 form a heat exchange channel with the space above the partition 5-3, through which cold water or other media to be heated can be introduced. When high-temperature steam flows above the partition 5-3, it exchanges heat with the medium in the heat exchange circulation pipes 5-6, and the steam heat is recovered and utilized, while the steam itself condenses into water, thus achieving waste heat recovery and energy saving.

[0033] The vent pipe 5-7 on the outer wall of the upper vessel 2 is located at the upper end of the partition 5-3. It can discharge air or excess steam from the vessel when the equipment starts up or the pressure is too high, thus balancing the internal pressure of the vessel and preventing damage to the equipment due to excessive pressure. The gas collection hood 5-5 at the lower end of the exhaust pipe 5-4 expands the steam collection range and ensures that steam enters the exhaust pipe 5-4 efficiently. The uniform distribution of the heating tubes 5-2 ensures that the wastewater in the lower vessel 1 is heated evenly, avoiding local overheating that could lead to coking and ensuring a stable dehydration process.

[0034] During operation, heating element 5-2 heats the wastewater to evaporate, steam is collected by hood 5-5 and sent to exhaust pipe 5-4, where steam exchanges heat with heat exchange circulation pipe 5-6, and vent pipe 5-7 balances the pressure. Stable heating ensures dehydration, waste heat exchange improves energy efficiency, and the coordinated operation of all components achieves efficient wastewater dehydration and energy recovery, meeting production needs.

[0035] For example, such as Figure 3 As shown, the exhaust pipe 5-4 is spirally coiled inside the upper vessel body 2.

[0036] In some examples, the exhaust pipe 5-4 is designed to be spirally coiled inside the upper vessel body 2, which can significantly improve the heat exchange efficiency between steam and the heat exchange medium. The spiral structure extends the flow path of steam in the exhaust pipe 5-4, while increasing the contact area between the exhaust pipe 5-4 and the heat exchange medium in the space above the partition 5-3 of the upper vessel body 2. This allows the high-temperature steam to fully release heat during its ascent, and to exchange heat more efficiently with the medium in the heat exchange circulation pipe 5-6.

[0037] For example, such as Figure 3 As shown, the bottom opening of the gas collection hood 5-5 has a funnel-shaped structure.

[0038] In some examples, the bottom opening of the gas collecting hood 5-5 is funnel-shaped, which can expand the steam collection range and enhance the steam capture capability. The funnel-shaped opening can guide the steam generated by evaporation in the lower vessel 1 to converge towards the center of the gas collecting hood 5-5, reducing the amount of steam that diffuses and escapes to the surroundings, and has a better gathering effect on the steam in the edge area of ​​the lower vessel 1.

[0039] For example, such as Figure 2 As shown, a discharge pipe 6 is provided at the bottom of the lower vessel body 1, and a switch valve connecting flange 7 is provided at the lower end of the discharge pipe 6.

[0040] In some examples, the discharge pipe 6 at the bottom of the lower vessel 1 and the switch valve connecting flange 7 at the lower end provide a convenient channel for the discharge and subsequent treatment of the residue after dehydration. The discharge pipe 6 is connected to the bottom of the lower vessel 1, which can centrally discharge the concentrated liquid or solid residue after dehydration; the switch valve can precisely control the timing and flow rate of discharge, avoid premature leakage of materials during the dehydration process, and ensure thorough dehydration.

[0041] In practical use: The telescopic cylinder 4-4 of the docking sealing assembly 4 is activated. Its output end, via the connecting frame 4-5, drives the upper vessel 2 to descend vertically, allowing the boss 4-2 at the bottom of the upper vessel 2 to precisely insert into the sleeve 4-1 at the top of the lower vessel 1, forming a sealed docking. Sodium salt production wastewater is injected into the lower vessel 1. The dehydration heat exchange assembly 5 is activated, and the heating pipe 5-2 in the inner layer 5-1 of the lower vessel 1 begins heating, causing the wastewater to evaporate. The steam generated by evaporation is collected by the trumpet-shaped gas collection hood 5-5 at the bottom of the partition 5-3 and flows upward along the spiral exhaust pipe 5-4. During this process, it exchanges heat with the medium in the heat exchange circulation pipe 5-6 on the outer wall of the upper vessel 2, achieving waste heat recovery. The steam after heat exchange is condensed or discharged, and the exhaust pipe 5-7 balances the pressure inside the vessel in real time. After dehydration is complete, the switch valve of the discharge pipe 6 at the bottom of the lower vessel 1 is opened, and the dehydration residue is discharged through the connecting flange. When the vessel body needs to be cleaned, the telescopic cylinder 4-4 extends and drives the upper vessel body 2 to rise. The boss 4-2 disengages from the sleeve 4-1, and the operator can directly clean the inner layer 5-1 of the lower vessel body 1, the partition layer 5-3 of the upper vessel body 2, and the exhaust pipe 5-4. After cleaning, the upper vessel body 2 can be reset. There is no need to disassemble a large number of parts throughout the process.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A dehydration kettle for wastewater processing in the production of monosodium salt, characterized in that, include: The vessel includes a lower vessel body (1), an upper vessel body (2), and several external supports (3). The external supports (3) are all fixed to the outside of the lower vessel body (1), and the upper vessel body (2) is mounted on the lower vessel body (1). A docking sealing assembly (4) is disposed between the upper vessel body (2) and the lower vessel body (1); A dehydration heat exchange assembly (5) is disposed in the upper vessel body (2) and the lower vessel body (1); The docking sealing assembly (4) includes a sleeve (4-1), which is arranged around the top of the lower vessel body (1). A boss (4-2) is provided around the bottom of the upper vessel body (2). The upper vessel body (2) is inserted vertically downward into the sleeve (4-1) through the boss (4-2). The bottom of the outer support (3) is provided with a bottom groove (4-3).

2. The dehydration kettle for wastewater processing in the production of monosodium salt according to claim 1, characterized in that, A telescopic cylinder (4-4) is vertically installed in the bottom groove (4-3). Several connecting frames (4-5) are arranged around the outer wall of the upper vessel body (2). The output end of the telescopic cylinder (4-4) is fixedly connected to the connecting frame (4-5).

3. The dehydration kettle for wastewater processing in the production of monosodium salt according to claim 1, characterized in that, The dehydration heat exchange component (5) includes an inner layer (5-1), which is arranged around the inner wall of the lower vessel (1). A plurality of heating tubes (5-2) are arranged in the inner layer (5-1), and a partition (5-3) is arranged in the upper vessel (2).

4. The dehydration kettle for wastewater processing in the production of monosodium salt according to claim 3, characterized in that, An exhaust pipe (5-4) is connected between the upper surface of the partition (5-3) and the top of the upper vessel body (2). The upper end of the exhaust pipe (5-4) is located outside the upper vessel body (2), and the lower end of the exhaust pipe (5-4) is located at the bottom of the partition (5-3).

5. The dehydration kettle for wastewater processing in the production of monosodium salt according to claim 4, characterized in that, The exhaust pipe (5-4) is provided with a gas collection hood (5-5) at its lower end. Both ends of the outer wall of the upper vessel (2) are provided with heat exchange circulation pipes (5-6). The outer wall of the upper vessel (2) is provided with an vent pipe (5-7). The vent pipe (5-7) is located at the upper end of the partition (5-3).

6. The dehydration kettle for wastewater processing in the production of monosodium salt according to claim 4, characterized in that, The exhaust pipe (5-4) is spirally coiled inside the upper vessel body (2).

7. A dehydration kettle for wastewater processing in the production of monosodium salt according to claim 5, characterized in that, The bottom opening of the gas collection hood (5-5) has a funnel-shaped structure.

8. The dehydration kettle for wastewater processing in the production of monosodium salt according to claim 1, characterized in that, The bottom of the lower vessel body (1) is provided with a discharge pipe (6), and the lower end of the discharge pipe (6) is provided with a switch valve connecting flange (7).

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