On-line separation device for salt paste in non-purified calcium brine heat pump salt evaporation tank

Abstract

The utility model discloses an online separation device for salt paste in a non-purified calcium brine heat pump salt evaporation tank, which belongs to the technical field of salt production, and includes an outer cylinder and an inner cylinder arranged inside the outer cylinder, and an interlayer inner cavity is formed between the outer cylinder and the inner cylinder; the outer cylinder includes an upper diameter reducing section, a transition section and a lower diameter reducing section connected in sequence along the flow direction of the feed liquid, the small diameter end of the upper diameter reducing section is connected to the lower end of the upper tube body, and the small diameter end of the lower diameter reducing section is connected to the upper end of the lower tube body; the fixed end of the inner cylinder is arranged in the small diameter end of the upper diameter reducing section, and is connected to the upper tube body, and the free end of the inner cylinder extends into the transition section; the upper diameter reducing section near the small diameter end is provided with a discharge pipe mouth for calcium sulfate discharge, and the inlet side of the discharge pipe mouth is connected to the interlayer inner cavity. The utility model can realize the automatic online separation of sodium chloride and calcium sulfate in the feed liquid during the flow process, and the method is simple and efficient.

Description

Technical Field

[0001] The utility model belongs to the technical field of salt production, and particularly relates to a salt paste online separation device in a non-purified calcium brine heat pump salt evaporation tank. Background Art

[0002] In the well salt industry, for calcium-type brine rock salt mines, the raw brine mined contains a small amount of calcium ions, magnesium ions, sulfate and other impurity ions in addition to sodium chloride. At present, for salt-making enterprises that use non-purified calcium-type brine heat pump salt-making technology, the brine pumped into the heat pump salt-making system is raw brine that has not been purified. While the raw brine evaporates and crystallizes in the evaporator to form sodium chloride (salt), the impurity ions such as calcium, magnesium, sulfate, etc. contained in it will precipitate as calcium sulfate, magnesium hydroxide and other insoluble substances during the evaporation and concentration process.

[0003] The circulation pipe in the evaporation tank is mainly responsible for connecting the heating chamber, evaporation chamber and circulation pump together, so that the preheated brine can be continuously evaporated, crystallized and precipitated in the evaporation tank by continuous circulation and heating, thereby obtaining refined industrial salt. In order to prevent the impurities of calcium sulfate (paste) in the evaporation tank from being enriched and affecting the quality of the final product sodium chloride (salt), it is necessary to control the content of calcium sulfate in the evaporation tank during the evaporation process. Therefore, in continuous production, there is an urgent need for an online automatic rapid separation device for salt paste of sodium chloride (salt) and calcium sulfate (paste). Summary of the invention

[0004] In view of the problems existing in the prior art, the utility model provides an online separation device for salt paste in a non-purified calcium brine heat pump salt evaporation tank, which adjusts the flow rate of the feed liquid by expanding and then shrinking the diameter, and separates the large-particle sodium chloride with high density and fast flow rate from the calcium sulfate with low density and slow flow rate in the feed liquid online. The sodium chloride and calcium sulfate in the feed liquid are automatically separated during the flow process, which is simple and efficient.

[0005] The utility model is implemented as follows: an online separation device for salt paste in a non-purified calcium brine heat pump salt evaporation tank, the evaporation tank comprises an evaporation chamber, a heating chamber and a circulation pipe for connecting the evaporation chamber and the heating chamber, the circulation pipe is provided with a circulation pump, the separation device is arranged on the vertical section of the circulation pipe, and the vertical section of the circulation pipe is divided into an upper tube body and a lower tube body, the separation device comprises an outer cylinder body and an inner cylinder body arranged inside the outer cylinder body, and a sandwich inner cavity is formed between the outer cylinder body and the inner cylinder body;

[0006] The outer cylinder includes an upper diameter reducing section, a transition section and a lower diameter reducing section which are connected in sequence along the flow direction of the liquid feed, wherein the small diameter end of the upper diameter reducing section is connected to the lower end of the upper tube body, and the small diameter end of the lower diameter reducing section is connected to the upper end of the lower tube body;

[0007] The fixed end of the inner cylinder is arranged in the small diameter end of the upper diameter reducing section and is connected with the upper tube body, and the free end of the inner cylinder extends into the transition section;

[0008] The upper reducer section near the small diameter end is provided with a discharge pipe opening for discharging calcium sulfate, the inlet side of the discharge pipe opening is connected with the inner cavity of the interlayer, the outlet side of the discharge pipe opening is provided with a discharge valve, and the outlet side of the discharge valve is connected with the mother liquor main pipe for discharging calcium sulfate.

[0009] Furthermore, the discharge pipe opening is provided with a flushing pipe opening connected to the discharge pipe opening, and the flushing pipe opening is provided with a flushing valve, and the water inlet side of the flushing valve is connected to the flushing water source through a pipeline. The flushing water source is controlled to enter the pipeline through the flushing valve, thereby effectively removing attachments on the pipeline wall, and effectively removing impurities, dirt and sediments in the discharge pipe opening, so as to keep the discharge pipe opening unobstructed and clean.

[0010] Furthermore, a support rib is provided on the outer wall of the inner cylinder near the free end, and the support rib extends to the inner wall of the transition section. The support rib can significantly improve the rigidity of the inner cylinder, especially at the free end, and help resist deformation caused by external loads or internal pressure changes; it can effectively reduce local deformation caused by stress concentration, especially in high stress areas.

[0011] Furthermore, there are four discharge pipe openings, which are evenly distributed along the circumference of the upper diameter-changing section, and the outlet side of the discharge valve on each discharge pipe opening is connected to the mother liquor main pipe.

[0012] Furthermore, the inner wall of the outer cylinder is provided with a corrosion-resistant lining. Since the sodium chloride liquid has a certain corrosive effect on metals and other materials. Especially when the liquid concentration is high or the environmental conditions, such as temperature, pressure, and flow rate, are relatively special, the corrosion effect may be more significant. Therefore, the corrosion-resistant lining provided can directly block the contact between the corrosive medium and the inner wall of the outer cylinder, significantly improving the outer cylinder's resistance to the corrosion caused by the sodium chloride liquid. The organic combination of the corrosion-resistant lining and the outer cylinder matrix also enhances the stability of the outer cylinder structure, especially when subjected to internal pressure, temperature changes or fluid velocity flow state changes, it can reduce mechanical risks such as deformation of the outer cylinder.

[0013] Furthermore, the corrosion-resistant lining is a stainless steel lining.

[0014] Furthermore, the flow direction of the medium in the discharge pipe opening is perpendicular to the flow direction of the slurry in the vertical section of the circulation pipe.

[0015] Furthermore, the upper diameter reducing section is provided with a manhole connected to the inner cavity of the interlayer. The provision of the manhole can facilitate operators to inspect, clean, and repair the inner cavity of the interlayer, reduce the need to disassemble other components or structures, and improve the efficiency of construction and maintenance.

[0016] The utility model has the following advantages and technical effects: due to the adoption of the above technical scheme, the structural design of the outer cylinder and the inner cylinder can realize the expansion and then reduction of the diameter to adjust the flow rate of the feed liquid, and the large-particle sodium chloride with high density and fast flow rate and the calcium sulfate with low density and slow flow rate in the feed liquid can be separated online in continuous production, thereby realizing the automatic separation of sodium chloride and calcium sulfate in the feed liquid during the flow of the feed liquid, and the method is simple and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the evaporation tank provided by the embodiment of the utility model;

[0018] Figure 2 It is a schematic diagram of the structure of the separation device provided in an embodiment of the utility model.

[0019] In the figure: 1. Evaporation chamber; 2. Circulation pipe; 2-1. Upper tube body; 2-2. Lower tube body; 3. Outer cylinder; 3-1. Upper reducing section; 3-2. Transition section; 3-3. Lower reducing section; 4. Inner cylinder; 5. Heating chamber; 6. Discharge pipe outlet; 7. Flushing pipe outlet; 8. Support rib plate; 9. Manhole. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0021] It should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0022] like Figure 1 and Figure 2As shown, the present application provides an online separation device for salt paste in a non-purified calcium brine heat pump salt evaporation tank, the evaporation tank includes an evaporation chamber 1, a heating chamber 5 and a circulation pipe 2 for connecting the evaporation chamber 1 and the heating chamber 5, the circulation pipe 2 is provided with a circulation pump, the separation device is arranged on the vertical section of the circulation pipe 2, and the vertical section of the circulation pipe 2 is divided into an upper tube body 2-1 and a lower tube body 2-2, the separation device includes an outer cylinder 3 and an inner cylinder 4 arranged inside the outer cylinder 3, and a sandwich cavity is formed between the outer cylinder 3 and the inner cylinder 4. Specifically, the inner diameter of the inner cylinder 4 is φ = 1986 mm, the wall thickness is δ = 6 mm, the length is H = 2612 mm, and the material is S31603. The inner diameter of the outer cylinder 3 is φ = 3400 mm, the total wall thickness is δ = 19 mm (wherein the thickness of the corrosion-resistant lining is 3 mm), and the length is H = 1500 mm.

[0023] The outer cylinder 3 includes an upper diameter reducing section 3-1, a transition section 3-2 and a lower diameter reducing section 3-3 which are connected in sequence along the flow direction of the feed liquid. The small diameter end of the upper diameter reducing section 3-1 is connected to the lower end of the upper tube body 2-1, the large diameter end of the upper diameter reducing section 3-1 is connected to the upper end of the transition section 3-2, the small diameter end of the lower diameter reducing section 3-3 is connected to the upper end of the lower tube body 2-2, and the large diameter end of the lower diameter reducing section 3-3 is connected to the lower end of the transition section 3-2; the fixed end of the inner cylinder 4 is arranged in the small diameter end of the upper diameter reducing section 3-1 and is connected to the upper tube body 2-1, and the free end of the inner cylinder 4 extends into the transition section 3-2;

[0024] A discharge pipe port 6 for discharging calcium sulfate is provided at the upper periphery of the upper diameter reducing section 3-1 near the small diameter end. Preferably, the flow direction of the medium in the discharge pipe port 6 is perpendicular to the flow direction of the liquid in the vertical section of the circulation pipe 2. The inlet side of the discharge pipe port 6 is connected to the inner cavity of the interlayer, and a discharge valve is provided on the outlet side of the discharge pipe port 6. The outlet side of the discharge valve is connected to the mother liquor main pipe for discharging calcium sulfate, and finally discharged from the evaporation tank through the mother liquor pump. Specifically, the discharge valve is a DN100 gate valve.

[0025] Furthermore, the discharge pipe mouth 6 is provided with a flushing pipe mouth 7 connected to the discharge pipe mouth 6, and the flushing pipe mouth 7 is provided with a flushing valve, and the water inlet side of the flushing valve is connected to the flushing water source through a pipeline. A flushing water pump is provided on the pipeline. Specifically, the flushing valve is a DN50 gate valve. The flushing water source is controlled to enter the pipeline through the flushing valve, so as to effectively remove the attachments on the pipeline wall, and effectively remove the impurities, dirt and sediments in the discharge pipe mouth 6, so as to keep the discharge pipe mouth 6 unobstructed and clean.

[0026] Furthermore, a support rib 8 is provided on the outer wall of the inner cylinder 4 near the free end, and the support rib 8 extends to the inner wall of the transition section 3-2. The support rib 8 can significantly improve the rigidity of the inner cylinder 4, especially at the free end, and help resist deformation caused by external loads or internal pressure changes; it can effectively reduce local deformation caused by stress concentration, especially in high stress areas.

[0027] Preferably, four discharge pipe openings 6 are provided, and the four discharge pipe openings 6 are evenly distributed along the circumference of the upper diameter-reducing section 3 - 1 , and the outlet side of the discharge valve on each discharge pipe opening 6 is connected to the mother liquor main pipe.

[0028] Furthermore, the inner wall of the outer cylinder 3 is provided with a corrosion-resistant lining. Since the sodium chloride liquid has a certain corrosive effect on metals and other materials. Especially when the liquid concentration is high or the environmental conditions, such as temperature, pressure, and flow rate, are relatively special, the corrosion effect may be more significant. Therefore, the corrosion-resistant lining provided can directly block the contact between the corrosive medium and the inner wall of the outer cylinder 3, and significantly improve the outer cylinder 3 against the corrosion caused by the sodium chloride liquid. The organic combination of the corrosion-resistant lining and the outer cylinder 3 matrix also enhances the stability of the structure of the outer cylinder 3, especially when subjected to internal pressure, temperature changes or fluid velocity flow state changes, it can reduce the mechanical risks such as deformation of the outer cylinder 3. Preferably, the corrosion-resistant lining is a stainless steel lining. The specific material of the outer cylinder 3 is S31603+Q345R composite plate.

[0029] Furthermore, the upper diameter reducing section 3-1 is provided with a manhole 9 connected to the inner cavity of the interlayer. The provision of the manhole 9 facilitates the operator to inspect, clean, and repair the inner cavity of the interlayer, reduces the need to disassemble other components or structures, and improves the efficiency of construction and maintenance.

[0030] Working principle: the liquid first enters the inner cylinder 4 from the upper tube 2-1 of the vertical section of the circulation tube 2, and then enters the transition section 3-2 of the outer cylinder 3 from the outlet of the inner cylinder 4. Since the diameter of the transition section 3-2 is larger than the diameter of the inner cylinder 4, a diameter expansion section is formed from the small diameter of the inner cylinder 4 to the large diameter of the transition section 3-2 in terms of physical structure. When the liquid passes through the diameter expansion section, the flow rate will slow down, the dynamic pressure will decrease, and the static pressure will increase. When the feed liquid flows inside the outer cylinder, the flow velocity distribution of the feed liquid is similar to a parabola. The closer to the center of the cylinder, the faster the flow velocity, and the closer to the cylinder wall, the slower the flow velocity. Due to the different densities of calcium sulfate and sodium chloride crystals, the large-particle sodium chloride crystals with higher density quickly flow down along the center of the cylinder with the feed liquid, quickly pass through the transition section 3-2 and the lower diameter-reducing section 3-3, and then enter the lower section pipe body 2-2, so that the sodium chloride crystals circulate and flow in the evaporator and continue to be heated, so that the sodium chloride crystals continue to grow during operation. The calcium sulfate in the feed liquid is automatically screened to the edge of the outer cylinder 3 with a slower flow rate due to its low density and small particles, and gradually floats in the interlayer inner cavity formed between the outer cylinder 3 and the inner cylinder 4, and gradually gathers at the small-diameter end of the upper diameter-reducing section 3-1 as the upper diameter-reducing section 3-1 is reduced, and is discharged into the mother liquid main pipe through the discharge nozzle 6.

[0031] Due to the adoption of the above technical solution, the structural design of the outer cylinder 3 and the inner cylinder 4 can adjust the flow rate of the slurry by expanding the diameter and then reducing the diameter, and complete the online separation of large-particle sodium chloride with high density and fast flow rate and calcium sulfate with low density and slow flow rate in the slurry during continuous production, thereby realizing automatic separation of sodium chloride and calcium sulfate in the slurry during the flow of the slurry, which is simple and efficient.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An online separation device for salt paste in a non-purified calcium brine heat pump salt evaporation tank, the evaporation tank comprising an evaporation chamber, a heating chamber and a circulation pipe for connecting the evaporation chamber and the heating chamber, the circulation pipe being provided with a circulation pump, characterized in that: The separation device is arranged on the vertical section of the circulation pipe, and divides the vertical section of the circulation pipe into an upper section pipe body and a lower section pipe body, the separation device comprises an outer cylinder body and an inner cylinder body arranged inside the outer cylinder body, and a sandwich inner cavity is formed between the outer cylinder body and the inner cylinder body; The outer cylinder includes an upper diameter reducing section, a transition section and a lower diameter reducing section which are connected in sequence along the flow direction of the liquid feed, wherein the small diameter end of the upper diameter reducing section is connected to the lower end of the upper tube body, and the small diameter end of the lower diameter reducing section is connected to the upper end of the lower tube body; The fixed end of the inner cylinder is arranged in the small diameter end of the upper diameter reducing section and is connected with the upper tube body, and the free end of the inner cylinder extends into the transition section; The upper reducer section near the small diameter end is provided with a discharge pipe opening for discharging calcium sulfate, the inlet side of the discharge pipe opening is connected with the inner cavity of the interlayer, the outlet side of the discharge pipe opening is provided with a discharge valve, and the outlet side of the discharge valve is connected with the mother liquor main pipe for discharging calcium sulfate.

2. The salt paste online separation device in the non-purified calcium brine heat pump salt evaporation tank according to claim 1 is characterized in that: The discharge pipe opening is provided with a flushing pipe opening connected with the discharge pipe opening, and the flushing pipe opening is provided with a flushing valve, and the water inlet side of the flushing valve is connected with a flushing water source through a pipeline.

3. The salt paste online separation device in the non-purified calcium brine heat pump salt evaporation tank according to claim 1 is characterized in that: A supporting rib is arranged on the outer wall of the inner cylinder near the free end, and the supporting rib extends to the inner wall of the transition section.

4. The salt paste online separation device in the non-purified calcium brine heat pump salt evaporation tank according to claim 1 is characterized in that: There are four discharge pipe openings, which are evenly distributed along the circumference of the upper diameter-changing section, and the outlet side of the discharge valve on each discharge pipe opening is connected to the mother liquid main pipe.

5. The salt paste online separation device in the non-purified calcium brine heat pump salt evaporation tank according to claim 1 is characterized in that: The inner wall of the outer cylinder is provided with a corrosion-resistant lining.

6. The salt paste online separation device in the non-purified calcium brine heat pump salt evaporation tank according to claim 5 is characterized in that: The corrosion-resistant lining is a stainless steel lining.

7. The salt paste online separation device in the non-purified calcium brine heat pump salt evaporation tank according to claim 1 is characterized in that: The flow direction of the medium in the discharge pipe opening is perpendicular to the flow direction of the feed liquid in the vertical section of the circulation pipe.

8. The salt paste online separation device in the non-purified calcium brine heat pump salt evaporation tank according to claim 1 is characterized in that: The upper diameter-changing section is provided with a manhole communicating with the inner cavity of the interlayer.

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