Evaporative crystallizer
By using transmitters and automatic control systems in the crystallizer, the problems of liquid level measurement deviation and high manual operation intensity were solved. Real-time monitoring of material density and liquid level in the crystallizer was achieved, and the discharge of salt legs was automatically controlled, thus improving production efficiency and stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SANFENG ENVIRONMENTAL TECH CO LTD
- Filing Date
- 2025-06-29
- Publication Date
- 2026-06-09
Smart Images
Figure CN224331543U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gas-liquid separation technology, specifically an evaporator crystallizer. Background Technology
[0002] The crystallizer is the core equipment for the crystallization process, mainly used to form crystals from solutes in solutions, melts, or gases through evaporation, cooling, and reaction. The liquid level control in the crystallizer directly affects crystallization efficiency, product quality, and system stability. Dual-flange differential pressure level gauges are commonly used for liquid level measurement in crystallizers due to their corrosion resistance, high pressure resistance, and high measurement accuracy. For example, the positive pressure flange should be installed in the top gas phase space of the crystallizer to prevent liquid from entering; the negative pressure flange should be installed in the lower liquid phase zone, and the pressure tap must be in contact with the liquid phase.
[0003] However, due to the presence of other impurities in the material solution inside the crystallizer, and the increase in solid content in the solution as crystallized salt is continuously evaporated and precipitated in the crystallizer, the solution density is a dynamic value. This results in a larger measurement deviation when using a dual-flange differential pressure level gauge, and the output of salt from the crystallizer leg is also inaccurate.
[0004] In addition, the discharge and rinsing of salt legs in the crystallizer are mostly done manually. Experienced operators control the amount and point of salt discharge based on past operating conditions. The manual operation is very arduous and not conducive to continuous production. Utility Model Content
[0005] This invention addresses the technical problems existing in the prior art by providing an evaporation crystallizer that can at least obtain the real-time density and liquid level of the material inside the crystallizer body, and can also realize automatic rinsing of the salt leg to avoid salt accumulation and solidification in the salt leg, which would affect the discharge effect.
[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: an evaporation crystallizer, comprising a crystallizer body, a first transmitter, and a second transmitter;
[0007] The first transmitter and the second transmitter are installed sequentially from top to bottom on the outside of the crystallizer body, with the first transmitter located above the material liquid level in the crystallizer body and the second transmitter located below the material liquid level in the crystallizer body.
[0008] As a further technical solution, a third transmitter is provided on the outside of the crystallizer body, and the third transmitter is located on the upper part of the salt leg of the crystallizer body.
[0009] As a further technical solution, the third transmitter is located in the gas phase of the crystallizer body.
[0010] As a further technical solution, the salt leg of the crystallizer body is provided with at least two rinsing ports.
[0011] As a further technical solution, each of the flushing ports is equipped with a solenoid valve.
[0012] As a further technical solution, the third transmitter is located on the salt leg of the crystallizer body, and the third transmitter is located above the flushing port.
[0013] As a further technical solution, the bottom of the salt leg of the crystallizer body is provided with a discharge port, and a pneumatic regulating valve is provided on the discharge port.
[0014] As a further technical solution, the first transmitter, the second transmitter, and the third transmitter are all pressure transmitters.
[0015] As a further technical solution, the first transmitter, the second transmitter, the third transmitter, and the solenoid valve are all electrically connected to the distributed control system.
[0016] As a further technical solution, a sight glass is provided on the salt leg of the crystallizer body.
[0017] The beneficial effects of this utility model are:
[0018] 1. The first and second transmitters on the crystallizer body can be used to calculate the real-time density of the material inside the crystallizer body by combining the known liquid pressure formula, which eliminates the need for repeated manual sampling and has a high degree of automation; combined with the third transmitter, the real-time liquid level of the material inside the crystallizer body and the amount of salt accumulated in the salt leg can be obtained.
[0019] The combined design of solenoid valves, pneumatic regulating valves, etc., enables automatic rinsing of the salt leg and avoids salt accumulation and solidification that would affect the discharge. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the structure of an evaporator crystallizer according to the present invention.
[0021] The attached diagram lists the components represented by each number as follows:
[0022] Crystallizer body 1, salt leg 11, flushing port 12, solenoid valve 13, pneumatic regulating valve 14, sight glass 15;
[0023] Transmitter 2 (first transmitter), transmitter 3 (second transmitter), transmitter 4 (third transmitter). Detailed Implementation
[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0025] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0026] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to implement and use the present invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the present invention can be implemented without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the present invention with unnecessary detail. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.
[0027] Example 1
[0028] This embodiment provides an evaporative crystallizer, including a crystallizer body 1, a first transmitter 2, and a second transmitter 3. The first transmitter 2 and the second transmitter 3 are installed sequentially from top to bottom on the outside of the crystallizer body 1, with the first transmitter 2 located above the liquid level of the material in the crystallizer body 1 and the second transmitter 3 located below the liquid level of the material in the crystallizer body 1. For example, if the first transmitter 2 and the second transmitter 3 are both pressure transmitters, the pressure and pressure difference between two points inside the crystallizer body 1 can be measured. Then, by combining the liquid pressure formula: ΔP=ρgh, the real-time density of the material inside the crystallizer body 1 can be calculated, eliminating the need for repeated manual sampling, and achieving a high degree of automation and improved work efficiency.
[0029] To improve automation and monitor the liquid level inside the crystallizer body 1 in real time, a third transmitter 4 is installed outside the crystallizer body 1. The third transmitter 4 is located on the upper part of the salt leg 11 of the crystallizer body 1. For example, the third transmitter 4 is also a pressure transmitter to monitor the pressure on the upper part of the salt leg 11 in the crystallizer body 1. Furthermore, the third transmitter 4 is located in the gas phase of the crystallizer body 1. By calculating the pressure difference between the pressure monitored by the second transmitter 3 and the pressure monitored by the third transmitter 4, and combining it with the density value of the material inside the crystallizer body 1 measured above, the height of the gas-liquid interface (i.e., the critical surface between the liquid phase and the gas phase) from the liquid level of the material in the crystallizer body 1 can be calculated. This realizes real-time detection of the liquid level of the material inside the crystallizer, and thus allows for the control of salt output from the crystallizer.
[0030] For example, the mass of the solid in the salt leg 11 inside the crystallizer body 1 (i.e., the amount of salt accumulated in the salt leg 11) can be calculated according to the formula that density multiplied by volume equals mass. Specifically, the salt leg 11 contains a mixture of liquid material and solid salt after solidification. The mass of the liquid (i.e., the material) can be obtained by multiplying the liquid density by the liquid volume (the volume of the liquid can be obtained based on empirical values, for example, by calculating the coefficient value of the liquid volume in the salt leg 11 through multiple experiments). The total mass of the mixture in the salt leg 11 is equal to the density of the mixture in the salt leg 11 (this value can be obtained by multiplying the liquid pressure formula and the pressure measured by the second transmitter 3 and the third transmitter 4) by the volume of the salt leg 11. Then, the total mass of the mixture in the salt leg 11 minus the mass of the liquid in the salt leg 11 equals the mass of the salt accumulated in the salt leg 11.
[0031] It should be noted that the first transmitter 2, the second transmitter 3, and the third transmitter 4 are all electrically connected to the distributed control system (not shown in the figure) to calculate and control the density and level of the liquid in the crystallizer body 1 in real time, and to achieve dynamic balance of the liquid level in the crystallizer and stability of the output quality.
[0032] To monitor the salt accumulation on the salt leg 11 in real time, a sight glass 15 is provided on the salt leg 11 of the crystallizer body 1.
[0033] In the specific implementation process, the salt leg 11 of the crystallizer body 1 is provided with at least two flushing ports 12 to prevent the salt leg 11 from being blocked. Furthermore, in order to improve automation and reduce manual operation, each flushing port 12 is provided with a solenoid valve 13, and the solenoid valve 13 is electrically connected to the distributed control system to adjust the flushing frequency of the flushing port 12 in real time and maintain the stable output of the salt leg 11.
[0034] To control the discharge of salt leg 11, a discharge port is provided at the bottom of the salt leg 11 of the crystallizer body 1, and a pneumatic regulating valve 14 is provided on the discharge port. To improve automation, the pneumatic regulating valve 14 is electrically connected to the distributed control system. Through the control of the distributed control system, the opening degree of the pneumatic regulating valve 14 is associated with the liquid level and density data of the material in the crystallizer body 1, as well as the flushing frequency of the solenoid valve 13, to prevent the salt leg 11 from clogging, and finally realize automatic control of the working liquid level to maintain stable discharge of salt leg 11.
[0035] Furthermore, to improve measurement accuracy, the third transmitter 4 is located on the salt leg 11 of the crystallizer body 1, and the third transmitter 4 is located above the flushing port 12.
[0036] This embodiment has a simple structure and can automatically control the working liquid level (i.e., material level) inside the crystallizer body 1, maintain stable output of salt leg 11, improve the degree of automation, ensure normal and stable operation, and maximize economic benefits.
[0037] In the implementation process, the action parameters of the solenoid valve 13 can be adjusted and the discharge speed can be set according to the material density and liquid level in the crystallizer body 1 fed back by each transmitter. At the same time, the flushing frequency can be set by the pneumatic regulating valve 14. The flushing effect can be observed and recorded by the sight glass 15 and a record sheet can be formed to obtain the real-time material concentration and the corresponding discharge speed parameters. Then, the discharge electromagnetic flow meter is used to record the curve of the discharge amount to obtain the optimal discharge amount and the limit discharge amount per unit area of the salt leg 11.
[0038] If a different material is used, repeat the above steps to obtain the optimal and maximum discharge rate per unit area at the salt leg when using the new material.
[0039] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.
[0040] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.
[0041] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.
Claims
1. An evaporation crystallizer, characterized in that, Includes crystallizer body (1), first transmitter (2), second transmitter (3); The first transmitter (2) and the second transmitter (3) are installed on the outside of the crystallizer body (1) from top to bottom, with the first transmitter (2) located above the material liquid surface in the crystallizer body (1) and the second transmitter (3) located below the material liquid surface in the crystallizer body (1).
2. The evaporator crystallizer according to claim 1, characterized in that, The crystallizer body (1) is further provided with a third transmitter (4) on its exterior, and the third transmitter (4) is located on the upper part of the salt leg (11) of the crystallizer body (1).
3. An evaporator crystallizer according to claim 2, characterized in that, The third transmitter (4) is located in the gas phase of the crystallizer body (1).
4. An evaporator crystallizer according to claim 2, characterized in that, The salt leg (11) of the crystallizer body (1) is provided with at least two rinsing ports (12).
5. An evaporator crystallizer according to claim 4, characterized in that, Each of the flushing ports (12) is provided with a solenoid valve (13).
6. An evaporator crystallizer according to claim 5, characterized in that, The third transmitter (4) is located on the salt leg (11) of the crystallizer body (1) and is located above the flushing port (12).
7. An evaporator crystallizer according to claim 1, characterized in that, The bottom of the salt leg (11) of the crystallizer body (1) is provided with a discharge port, and a pneumatic regulating valve (14) is provided on the discharge port.
8. An evaporator crystallizer according to claim 2, characterized in that, The first transmitter (2), the second transmitter (3), and the third transmitter (4) are all pressure transmitters.
9. An evaporator crystallizer according to claim 5, characterized in that, The first transmitter (2), the second transmitter (3), the third transmitter (4), and the solenoid valve (13) are all electrically connected to the distributed control system.
10. An evaporator crystallizer according to claim 1, characterized in that, The crystallizer body (1) has a viewing mirror (15) on its salt leg (11).