Evaporation and concentration device for magnesium chloride production

Abstract

The utility model discloses an evaporation and concentration device for magnesium chloride production, which relates to the field of magnesium chloride production and comprises a preheater, an evaporator, a separator I and a concentrated solution storage tank, a gas outlet of the first separator is communicated with a heat exchange medium inlet of the preheater, a hollow spiral baffle plate is arranged in the preheater, and the two ends of the hollow spiral baffle plate are communicated with the heat exchange medium inlet and a heat exchange medium outlet of the preheater respectively. Liquid outlets of the separator I and the evaporator are communicated with a concentrated solution storage tank; a heat exchange medium outlet of the evaporator is communicated with a second separator, a gas outlet of the second separator is communicated with a heat exchange medium inlet of the preheater, a liquid outlet of the second separator is communicated with the heater, and a gas outlet of the heater is communicated with a heat exchange medium inlet of the evaporator. According to the device, steam generated in the evaporation process is recycled, condensate water generated in the evaporation process is effectively recycled, energy consumption is reduced, the heat exchange efficiency is high, and therefore the evaporation efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of magnesium chloride production technology, specifically to an evaporation and concentration device for magnesium chloride production. Background Technology

[0002] Magnesium chloride, with the chemical formula MgCl2, can form a hexahydrate, namely magnesium chloride hexahydrate. Industrially, anhydrous magnesium chloride is often called brine powder, while magnesium chloride hexahydrate is often called brine flakes, brine granules, or brine blocks. Both anhydrous and hexahydrate magnesium chloride share the common property of being hygroscopic and readily soluble in water. Therefore, it is important to store them in a dry, cool place. The current process for producing magnesium chloride includes the following steps: preliminary treatment of the brine or solution containing magnesium chloride to remove insoluble impurities such as mud, sand, and suspended solids; and then concentration treatment before crystallization to improve the crystallization effect. Currently, the equipment used for evaporation and concentration in the production of magnesium chloride has the following main drawbacks: high energy consumption and low evaporation efficiency. To solve these technical problems, it is necessary to improve the existing evaporation and concentration equipment. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an evaporation and concentration device for magnesium chloride production, which addresses the shortcomings of the existing technology by recycling the steam generated during the evaporation process and effectively recovering the condensate generated during the evaporation process, thereby reducing energy consumption, increasing heat exchange efficiency, and improving evaporation efficiency.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] An evaporation and concentration device for magnesium chloride production includes a preheater, an evaporator, a first separator, and a concentrated liquid storage tank. The gas outlet of the first separator is connected to the heat exchange medium inlet of the preheater. The preheater is equipped with a hollow spiral baffle, the two ends of which are connected to the heat exchange medium inlet and outlet of the preheater, respectively. The liquid outlets of the first separator and the evaporator are connected to the concentrated liquid storage tank. The heat exchange medium outlet of the evaporator is connected to a second separator, the gas outlet of the second separator is connected to the heat exchange medium inlet of the preheater, the liquid outlet of the second separator is connected to a heater, and the gas outlet of the heater is connected to the heat exchange medium inlet of the evaporator.

[0006] Preferably, the preheater is provided with multiple heat exchange tubes, the inner wall of the heat exchange tubes is provided with baffles, and the heat exchange tubes are connected to the liquid inlet of the preheater.

[0007] Preferably, the hollow spiral baffle plate is provided with multiple mounting holes, and the heat exchange tube passes through the mounting holes into the hollow spiral baffle plate.

[0008] Preferably, the heater is equipped with an electric heating element.

[0009] Preferably, the evaporator is provided with a liquid distribution mechanism at the gas outlet, the liquid distribution mechanism including multiple liquid distribution plates arranged in an alternating manner, and the liquid distribution plates are provided with multiple diversion holes.

[0010] Preferably, the positions of the diversion holes of two adjacent liquid distribution plates are staggered.

[0011] Preferably, the edge of the liquid distribution plate is provided with multiple inclined guide grooves.

[0012] Due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0013] This utility model provides an evaporation and concentration device for magnesium chloride production, including a preheater, an evaporator, a first separator, a second separator, a concentrated liquid storage tank, and a heater. The gas outlet and heat exchange medium outlet of the evaporator are respectively connected to the first separator and the second separator. The gas outlets of the first separator and the second separator are connected to the heat exchange medium inlet of the preheater. The liquid outlet of the second separator is connected to the heater. The gas outlet of the heater is connected to the heat exchange medium inlet of the evaporator. This device realizes the recovery and utilization of heat during the evaporation and concentration process, reduces energy consumption during the evaporation and concentration process, improves the energy utilization efficiency of the device, and reduces production costs.

[0014] The preheater of this device is equipped with a hollow spiral baffle, heat exchange tubes, and turbulence vanes. The hollow spiral baffle increases the flow and turbulence of the heat exchange medium, making heat transfer more efficient. The turbulence vanes on the inner wall of the heat exchange tubes disrupt the flow boundary layer of the liquid, promote turbulence, accelerate the heat transfer rate, and help improve preheating efficiency.

[0015] The liquid separation mechanism at the evaporator outlet of this device uses a multi-layered staggered liquid separation plate with intersecting flow holes on the plate, which can effectively intercept liquid droplets carried in the gas and greatly improve the gas-liquid separation effect. The inclined guide grooves on the edge of the liquid separation plate can smoothly guide the intercepted liquid into the collection area, avoiding secondary entrainment of liquid into the airflow and ensuring the smooth progress of the evaporation process. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the heat exchange tube in Example 1;

[0019] Figure 3 This is a schematic diagram of the liquid separation mechanism in Example 1;

[0020] In the diagram, 1 is the preheater; 2 is the evaporator; 3 is the first separator; 4 is the concentrate storage tank; 5 is the hollow spiral baffle; 6 is the second separator; 7 is the heater; 8 is the electric heating element; 9 is the heat exchange tube; 10 is the baffle; 11 is the liquid distribution plate; 12 is the diversion hole; and 13 is the inclined guide channel. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0022] Example 1

[0023] like Figure 1-3 As shown, an evaporation and concentration device for magnesium chloride production includes a preheater 1, an evaporator 2, a separator 3, and a concentrate storage tank 4. The gas outlet of the separator 3 is connected to the heat exchange medium inlet of the preheater 1. The preheater 1 is equipped with a hollow spiral baffle 5, the two ends of which are connected to the heat exchange medium inlet and the heat exchange medium outlet of the preheater 1, respectively. The hollow spiral baffle 5 can increase the heat exchange area and turbulence of the heat exchange medium in the preheater 1, thereby improving the preheating efficiency and thus the evaporation efficiency.

[0024] The liquid outlets of separator 3 and evaporator 2 are connected to the concentrate storage tank 4; the heat exchange medium outlet of evaporator 2 is connected to separator 6, the gas outlet of separator 6 is connected to the heat exchange medium inlet of preheater 1, the liquid outlet of separator 6 is connected to heater 7, and the gas outlet of heater 7 is connected to the heat exchange medium inlet of evaporator 2; the heater 7 is equipped with electric heating elements 8; the steam generated during the evaporation process is recovered and reused through separator 3 and separator 6, and recycled back to preheater 1 as a heat exchange medium, realizing the recycling of heat and reducing energy consumption.

[0025] Furthermore, in this embodiment, the preheater 1 is provided with a plurality of heat exchange tubes 9, and the inner wall of the heat exchange tubes 9 is provided with baffles 10. The heat exchange tubes 9 are connected to the liquid inlet of the preheater 1. The combined arrangement of the heat exchange tubes 9 and the baffles 10 can further increase the heat exchange area and fluid disturbance, enhance the heat exchange effect, not only improve the heat exchange efficiency of the preheater 1, but also help maintain the uniformity of temperature distribution in the preheater 1.

[0026] Furthermore, in this embodiment, the hollow spiral baffle 5 is provided with multiple mounting holes (not shown in the figure), and the heat exchange tube 9 passes through the mounting holes to the hollow spiral baffle 5.

[0027] Furthermore, in this embodiment, a liquid distribution mechanism is provided at the outlet of the evaporator 2. The liquid distribution mechanism includes multiple liquid distribution plates 11 arranged in an alternating manner, and multiple diversion holes 12 are provided on the liquid distribution plates 11. The diversion holes 12 of adjacent liquid distribution plates 11 are staggered. Multiple inclined guide grooves 13 are provided on the edge of the liquid distribution plates 11. Through the design of the staggered multi-layer liquid distribution plates 11, diversion holes 12 and inclined guide grooves 13, the liquid droplets entrained in the steam generated by the evaporator 2 can be effectively separated, avoiding the liquid droplets from entering the separator 3 with the steam and affecting the evaporation effect, thereby improving the stability and efficiency of evaporation.

[0028] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An evaporation concentration device for producing magnesium chloride, characterized by: The application relates to a concentration liquid storage tank comprising a preheater, an evaporator and a separator I, wherein the gas outlet of the separator I is communicated with the heat exchange medium inlet of the preheater, the preheater is internally provided with a hollow spiral baffle, the hollow spiral baffle is communicated with the heat exchange medium inlet and the heat exchange medium outlet of the preheater at two ends respectively, the liquid outlets of the separator I and the evaporator are communicated with the concentration liquid storage tank, the heat exchange medium outlet of the evaporator is communicated with a separator II, the gas outlet of the separator II is communicated with the heat exchange medium inlet of the preheater, the liquid outlet of the separator II is communicated with a heater, and the gas outlet of the heater is communicated with the heat exchange medium inlet of the evaporator.

2. The evaporation and concentration device for producing magnesium chloride according to claim 1, characterized in that: The preheater is internally provided with a plurality of heat exchange tubes, the inner wall of the heat exchange tube is provided with a spoiler, and the heat exchange tube is communicated with the liquid inlet of the preheater.

3. The evaporation and concentration device for producing magnesium chloride according to claim 2, characterized in that: The hollow spiral baffle is provided with a plurality of mounting holes, and the heat exchange tube passes through the hollow spiral baffle through the mounting holes.

4. The evaporation and concentration device for producing magnesium chloride according to claim 1, characterized in that: The heater is internally provided with an electric heating sheet.

5. The evaporation and concentration device for producing magnesium chloride according to claim 1, characterized in that: The gas outlet of the evaporator is provided with a liquid distribution mechanism, the liquid distribution mechanism comprises a plurality of layers of liquid distribution plates which are staggered, the liquid distribution plate is provided with a plurality of flow distribution holes, the flow distribution holes of adjacent two layers of liquid distribution plates are staggered with each other, and the edge of the liquid distribution plate is provided with a plurality of inclined flow guide grooves.

6. The evaporation and concentration device for producing magnesium chloride according to claim 5, characterized in that: The edge of the liquid distribution plate is provided with a plurality of inclined flow guide grooves.

7. The evaporation and concentration device for producing magnesium chloride according to claim 5, characterized in that: ​

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