A concentration kettle for sodium nitrate production

Abstract

The utility model belongs to sodium nitrate production technical field especially relates to a concentration kettle for sodium nitrate production, it is connected with the conveying pipe in the bottom of the separation kettle, the conveying pipe one side is connected with the feed pipe, the conveying pipe one end is provided with the cyclone for separating crystal, the conveying pipe one end is provided with the drive assembly for liquid flow, the evaporation cylinder is arranged in one side of separation kettle, the inner chamber of evaporation cylinder is provided with first flow channel, second flow channel and third flow channel respectively, first flow channel is located the outside of second flow channel, second flow channel is spiral, compared with prior art, the utility model realizes the adaptation of different concentration stage heat exchange demand, improves the continuity and stability of sodium nitrate production, prolongs the contact time of heat exchange medium and solution, increases the contact area, ensures that the heat exchange is fully even, improves the concentration efficiency, reduces the energy cost.

Description

Technical Field

[0001] This utility model belongs to the field of sodium nitrate production technology, and in particular relates to a concentration kettle for sodium nitrate production. Background Technology

[0002] Sodium nitrate liquid is a solution formed by dissolving sodium nitrate in a liquid. Sodium nitrate is a colorless, transparent or slightly yellow crystal that is easily soluble in water and other liquids. Dissolution is endothermic, which causes the solution temperature to drop. The aqueous solution is neutral. It has a wide range of industrial applications, including glass manufacturing, enamel industry, match production, ceramics industry, and fertilizer production. The concentration kettle is a key piece of equipment in the sodium nitrate production process. It is mainly used to evaporate and concentrate the sodium nitrate solution. By heating, the water is vaporized, increasing the concentration of sodium nitrate to the crystallization point, thus creating conditions for subsequent crystallization and separation.

[0003] Chinese Patent Publication No. 202322015165.3 discloses a preparation vessel for preparing sodium nitrite solution, comprising an outer tank and an inner tank, with the inner tank nested inside the outer tank. A gas cavity is provided between the outer and inner tanks. A cap is snapped onto the top of the outer tank, and a waste heat reflux assembly is provided at the outer end of the outer tank. The waste heat reflux assembly includes an inlet long pipe fixedly connected between the outer tank and the cap. This utility model relates to the field of preparation vessel technology. This preparation vessel for preparing sodium nitrite solution introduces high-temperature gas generated by heating in the inner tank into the gas cavity between the outer and inner tanks through the inlet long pipe, so that the refluxed high-temperature gas continuously heats the inner tank. While maintaining the temperature of the inner tank, the heat of the gas is recovered and reused, reducing heat loss and saving energy. At the same time, the high-temperature gas enters the inner tank through the reflux short pipe after passing through the gas cavity, preventing the volatilized gas from being mixed with the raw material evaporation gas, thus preventing raw material waste.

[0004] However, existing technologies have the following problems when in use: traditional concentration kettles used for sodium nitrate production generally only use one heat exchange medium and a fixed heat exchange path, which cannot adapt to the differentiated heat exchange requirements of sodium nitrate solution at different concentration stages, thus reducing the continuity and stability of sodium nitrate production. Utility Model Content

[0005] The purpose of this utility model is to address the aforementioned technical problems by providing a concentration kettle for sodium nitrate production, comprising: A separation vessel, the bottom of which is connected to a conveying pipe, one side of which is connected to a feed pipe, one end of which is equipped with a hydrocyclone for separating crystals, and one end of which is equipped with a driving component for liquid flow. An evaporation cylinder is disposed on one side of a separation vessel. The inner cavity of the evaporation cylinder is provided with a first flow channel, a second flow channel, and a third flow channel. The first flow channel is located outside the second flow channel, the second flow channel is spiral-shaped, and the third flow channel is located inside the second flow channel. The inner cavity of the first flow channel is provided with a spiral tube, and the second flow channel and the third flow channel are connected by a connecting pipe. The sodium nitrate solution enters the first flow channel of the evaporation cylinder and undergoes heat exchange through the spiral tube in the first flow channel, or through the second and third flow channels.

[0006] Furthermore, the drive assembly includes a power component, which is fixedly disposed at the lower end of the side wall of the conveying pipe. The power output end of the power component passes through the side wall of the conveying pipe and is fixedly connected to a turbine.

[0007] Furthermore, one end of the conveying pipe is connected to a connecting pipe, and one end of the connecting pipe is connected to the hydrocyclone.

[0008] Furthermore, the bottom end of the evaporator is connected to a transport pipe, and one end of the transport pipe is connected to a hydrocyclone.

[0009] Furthermore, the spiral tube is provided with a first inflow portion and a first outflow portion at both ends, and one end of the first inflow portion and the first outflow portion penetrates the inner cavity of the first flow channel and extends to the outside of the evaporation cylinder.

[0010] Furthermore, a second outflow section is provided at the top of the second flow channel.

[0011] Furthermore, a second inflow portion is provided at the top of the third flow channel.

[0012] The top of the first flow channel is connected to a discharge pipe, one end of which is connected to the separation vessel.

[0013] Furthermore, an exhaust port is provided at the top of the separation vessel.

[0014] Compared with the prior art, the concentration kettle for sodium nitrate production described in this utility model has the following advantages: The design of the first flow channel with a built-in spiral tube allows for the connection of heat exchange medium. The spiral tube increases the contact area, meeting the heating and evaporation requirements of low-concentration sodium nitrate solution. Meanwhile, the spiral second and third flow channels form an independent heat exchange path through a connecting pipe, which can accommodate mild heat exchange mediums, providing a uniform and gentle heat exchange environment for the solution and adapting to the heat exchange requirements of different concentration stages.

[0015] The dual heat exchange path design allows for adjustment of the heat exchange mode based on changes in solution concentration without interrupting production, overcoming the limitations of traditional fixed paths and improving the continuity and stability of sodium nitrate production.

[0016] The spiral structure of the spiral tube and the spiral extension design of the second flow channel extend the contact time between the heat exchange medium and the solution, increase the contact area, ensure sufficient and uniform heat exchange, improve concentration efficiency, and reduce energy consumption costs. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a front view of the structure of this utility model; Figure 3 This is a cross-sectional structural diagram of the present invention.

[0018] The markings in the diagram are as follows: 100. Separation vessel; 110. Conveying pipe; 111. Feed pipe; 120. Power component; 121. Turbine; 130. Connecting pipe; 140. Hydrocyclone; 150. Exhaust port; 200. Evaporation cylinder; 210. Transport pipe; 220. First flow channel; 230. Spiral tube; 231. First inlet section; 232. First outlet section; 240. Second flow channel; 241. Second outlet section; 250. Third flow channel; 251. Second inlet section; 252. Connecting pipe; 260. Discharge pipe. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0020] It should be noted that all directional and positional terms used in this utility model, such as "up," "down," "left," "right," "front," "back," "vertical," "horizontal," "inner," "outer," "top," "lower," "lateral," "longitudinal," and "center," are only used to explain the relative positional relationships and connection arrangements between components in a specific state (as shown in the accompanying drawings). They are merely for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0021] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0023] like Figures 1-3 As shown, a concentration vessel for sodium nitrate production includes: Separation vessel 100, with a conveying pipe 110 connected to the bottom of separation vessel 100, a feed pipe 111 connected to one side of conveying pipe 110, a hydrocyclone 140 for separating crystals provided at one end of conveying pipe 110, and a driving component for liquid flow provided at one end of conveying pipe 110. An evaporator 200 is disposed on one side of the separation vessel 100. The inner cavity of the evaporator 200 is provided with a first flow channel 220, a second flow channel 240 and a third flow channel 250. The first flow channel 220 is located outside the second flow channel 240, which is spiral in shape, and the third flow channel 250 is located inside the second flow channel 240. A spiral tube 230 is disposed in the inner cavity of the first flow channel 220. The second flow channel 240 and the third flow channel 250 are connected by a connecting pipe 252. The sodium nitrate solution enters the first flow channel 220 of the evaporation cylinder 200 and undergoes heat exchange through the spiral tube 230 in the first flow channel 220, or through the second flow channel 240 and the third flow channel 250.

[0024] As a preferred example of this utility model, the bottom of the separation vessel 100 is connected to the conveying pipe 110, which can receive sodium nitrate solution. The feed pipe 111 provides a channel for solution input. The drive component at one end of the conveying pipe 110 can drive the solution flow to ensure that the solution is delivered to the hydrocyclone 140 for crystal separation. The evaporation cylinder 200 serves as the core of concentration. Its inner cavity has a first flow channel 220, a second flow channel 240, and a third flow channel 250 forming a multi-level heat exchange space. The first flow channel 220 is located on the outside and has a built-in spiral tube 230. The spiral structure of the spiral tube 230 can increase the contact area with the solution. The second flow channel 240 extends the solution flow path in a spiral shape. The inner third flow channel 250 is connected to the second flow channel 240 through the connecting pipe 252, so that the solution can continuously exchange heat between the two flow channels. The setting of the two heat exchange paths can adapt to the processing requirements of sodium nitrate solutions of different concentrations.

[0025] In the example of this application, the drive assembly includes a power component 120, which is fixedly disposed at the lower end of the side wall of the delivery pipe 110. The power output end of the power component 120 passes through the side wall of the delivery pipe 110 and is fixedly connected to a turbine 121.

[0026] As a preferred example of this utility model, in the drive assembly, the power component 120 is fixed to the lower end of the side wall of the delivery pipe 110, is installed securely and close to the solution flow path, and its power output end directly penetrates the side wall of the delivery pipe 110 and is connected to the turbine 121, so that the turbine 121 agitates and transports the sodium nitrate solution in the delivery pipe 110.

[0027] In the example of this application, one end of the delivery pipe 110 is connected to the connecting pipe 130, and one end of the connecting pipe 130 is connected to the hydrocyclone 140.

[0028] As a preferred example of this utility model, one end of the conveying pipe 110 is connected to the connecting pipe 130, and the other end is directly connected to the hydrocyclone 140, forming a transition channel between the conveying pipe 110 and the hydrocyclone 140.

[0029] In the example of this application, the bottom end of the evaporator 200 is connected to a transport pipe 210, and one end of the transport pipe 210 is connected to the hydrocyclone 140.

[0030] As a preferred example of this utility model, the transport pipe 210 connected to the bottom of the evaporator 200 is directly connected to the hydrocyclone 140 at one end. Specifically, one end of the transport pipe 210 is connected to a discharge pipe through a control valve, so that the concentrated sodium nitrate solution is discharged.

[0031] In the example of this application, the spiral tube 230 is provided with a first inflow portion 231 and a first outflow portion 232 at both ends. One end of the first inflow portion 231 and the first outflow portion 232 penetrates the inner cavity of the first flow channel 220 and extends to the outside of the evaporation cylinder 200.

[0032] As a preferred example of this utility model, the first inflow portion 231 and the first outflow portion 232 at both ends of the spiral tube 230 penetrate the inner cavity of the first flow channel 220 and extend to the outside of the evaporation cylinder 200, so that the external heat exchange medium can enter the spiral tube 230 through the first inflow portion 231 and be discharged through the first outflow portion 232.

[0033] In the example of this application, a second outflow portion 241 is provided at the top of the second flow channel 240.

[0034] As a preferred example of this utility model, a second outlet 241 is provided at the top of the second flow channel 240. Due to the spiral structure of the second flow channel 240, the solution or heat exchange medium can be discharged through the second outlet 241 during the spiral ascent.

[0035] In the example of this application, a second inflow portion 251 is provided at the top of the third flow channel 250.

[0036] As a preferred example of this utility model, the second inlet 251 provided at the top of the third flow channel 250 provides an inlet for the solution or heat exchange medium to enter the third flow channel 250. Combined with the structure that connects the second flow channel 240 and the third flow channel 250 through the connecting pipe 252, the medium can flow stably along the third flow channel 250 after entering from the second inlet 251, and form a heat exchange cooperation with the medium in the second flow channel 240.

[0037] In the example of this application, the top of the first flow channel 220 is connected to a discharge pipe 260, and one end of the discharge pipe 260 is connected to the separation vessel 100.

[0038] As a preferred example of this utility model, the discharge pipe 260 connected to the top of the first flow channel 220 is directly connected to the separation vessel 100 at one end, forming a circulating concentration path for the sodium nitrate solution. The solution concentrated by heat exchange in the first flow channel 220 can be directly returned to the separation vessel 100 along the discharge pipe 260.

[0039] In the example of this application, the top of the separation vessel 100 is provided with an exhaust port 150.

[0040] As a preferred example of this utility model, the exhaust port 150 provided at the top of the separation vessel 100 can promptly discharge the steam and other gases generated during the concentration of sodium nitrate solution.

[0041] In practical use, sodium nitrate solution can enter the conveying pipe 110 through the feed pipe 111. Under the action of the turbine 121 driven by the power component 120 of the drive assembly, it flows along the conveying pipe 110 and enters the hydrocyclone 140 through the connecting pipe 130. At the same time, the sodium nitrate solution can enter the evaporator 200 for concentration. The solution can enter the first flow channel 220, and the spiral tube 230 can be connected to the heat exchange medium through the first inlet 231 and discharged through the first outlet 232 to achieve heat exchange with the solution in the first flow channel 220; or the solution can enter the third flow channel 250 through the second inlet 251 at the top of the third flow channel 250, and then enter the spiral tube 250 through the connecting pipe 252. The solution flows out through the second outlet 241 at the top of the second flow channel 240, completing the heat exchange of this path; the solution after heat exchange in the first flow channel 220 enters the separation vessel 100 through the top-connected discharge pipe 260; the exhaust port 150 at the top of the separation vessel 100 can discharge the internal gas; the solution in the separation vessel 100 is transported again through the bottom conveying pipe 110; the bottom end of the evaporation cylinder 200 is connected to the hydrocyclone 140 through the transport pipe 210, so that the concentrated solution in the evaporation cylinder 200 can enter the hydrocyclone 140 through the transport pipe 210; the hydrocyclone 140 performs crystal separation on the entering solution, forming a complete sodium nitrate liquid production concentration process.

[0042] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A concentration vessel for sodium nitrate production, characterized in that, include: A separation vessel (100) is connected to a conveying pipe (110) at its bottom. A feed pipe (111) is connected to one side of the conveying pipe (110). A hydrocyclone (140) for separating crystals is provided at one end of the conveying pipe (110). A drive assembly for liquid flow is provided at one end of the conveying pipe (110). An evaporator (200) is disposed on one side of a separation vessel (100). The inner cavity of the evaporator (200) is provided with a first flow channel (220), a second flow channel (240) and a third flow channel (250). The first flow channel (220) is located outside the second flow channel (240). The second flow channel (240) is spiral in shape, and the third flow channel (250) is located inside the second flow channel (240). The inner cavity of the first flow channel (220) is provided with a spiral tube (230). The second flow channel (240) and the third flow channel (250) are connected by a connecting pipe (252). The sodium nitrate solution enters the first flow channel (220) of the evaporation cylinder (200) and undergoes heat exchange through the spiral tube (230) in the first flow channel (220), or through the second flow channel (240) and the third flow channel (250).

2. A concentration kettle for sodium nitrate production according to claim 1, characterized in that, The drive assembly includes a power component (120), which is fixedly disposed at the lower end of the side wall of the conveying pipe (110). The power output end of the power component (120) passes through the side wall of the conveying pipe (110) and is fixedly connected to a turbine (121).

3. A concentration kettle for sodium nitrate production according to claim 1, characterized in that, One end of the delivery pipe (110) is connected to a connecting pipe (130), and one end of the connecting pipe (130) is connected to a hydrocyclone (140).

4. A concentration kettle for sodium nitrate production according to claim 1, characterized in that, The bottom end of the evaporator (200) is connected to a transport pipe (210), and one end of the transport pipe (210) is connected to a hydrocyclone (140).

5. A concentration kettle for sodium nitrate production according to claim 1, characterized in that, The spiral tube (230) is provided with a first inflow portion (231) and a first outflow portion (232) at both ends. One end of the first inflow portion (231) and the first outflow portion (232) penetrates the inner cavity of the first flow channel (220) and extends to the outside of the evaporation cylinder (200).

6. A concentration kettle for sodium nitrate production according to claim 1, characterized in that, The top of the second flow channel (240) is provided with a second outflow section (241).

7. A concentration kettle for sodium nitrate production according to claim 1, characterized in that, The top of the third flow channel (250) is provided with a second inflow section (251).

8. A concentration kettle for sodium nitrate production according to claim 1, characterized in that, The top of the first flow channel (220) is connected to a discharge pipe (260), one end of which is connected to the separation vessel (100).

9. A concentration kettle for sodium nitrate production according to claim 1, characterized in that, The top of the separation vessel (100) is provided with an exhaust port (150).

Images