Quadruple-effect evaporation system with concentration detection function

Abstract

The utility model discloses a quadruple-effect evaporation system with a concentration detection function. The quadruple-effect evaporation system comprises a first-effect heater, a first-effect separator, a second-effect heater, a second-effect separator, a third-effect heater, a third-effect separator, a quadruple-effect heater and a quadruple-effect separator, materials flow and circulate in the fourth-effect evaporation equipment, the first-effect evaporation equipment, the second-effect evaporation equipment and the third-effect evaporation equipment in sequence. A concentration detection device is arranged on a discharging pipe on the front side of a triple-effect discharging pump, the concentration detection device comprises a controller, a discharging valve, a first pressure transformer and a second pressure transformer, the first pressure transformer and the second pressure transformer are vertically arranged on the discharging pipe in a spaced mode, and in the discharging direction, the first pressure transformer and the second pressure transformer are located on the front side of the triple-effect discharging pump; the discharge valve is positioned on the rear side of the triple-effect discharge pump; and the first pressure transformer, the second pressure transformer and the discharge valve are all connected with the controller. When the pressure difference between the first pressure transformer and the second pressure transformer reaches the preset standard, namely the concentration of the feed liquid reaches the standard, the controller controls the discharge valve to be opened, the qualified feed liquid is discharged, and the production efficiency is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of evaporation and concentration, in particular to a four-effect evaporation system with concentration detection. Background Art

[0002] Multi-effect evaporation is a very important link in the process of wastewater and waste solvent recovery. In multi-effect evaporation, heating steam is added to the first effect, and the secondary steam generated from the first effect is used as the heating steam for the second effect. The heating chamber of the second effect is equivalent to the condenser of the first effect, and the secondary steam generated from the second effect is used as the heating steam for the third effect. In this way, multiple evaporators are connected in series to form a multi-effect evaporation.

[0003] The existing evaporation equipment is unable to detect the concentration of the feed liquid. Some of the feed liquid is discharged before reaching the corresponding concentration standard and is transported to the next production process, which affects the product qualification rate and has low production efficiency. Utility Model Content

[0004] The utility model mainly solves the technical problem of providing a four-effect evaporation system with concentration detection, which solves the problem that the existing evaporation equipment cannot detect the concentration of the feed liquid and has low production efficiency.

[0005] In order to solve the above technical problems, a technical solution adopted by the utility model is to provide a four-effect evaporation system with concentration detection, including a first-effect heater, a first-effect separator, a second-effect heater, a second-effect separator, a third-effect heater, a third-effect separator, a fourth-effect heater and a fourth-effect separator;

[0006] The feed port of the four-effect heater is connected to the feed pipe, the discharge ports of the four-effect heater and the four-effect separator are connected to the feed ports of the four-effect circulation pump and the first-effect feed pump, the discharge port of the four-effect circulation pump is connected to the return port of the four-effect heater, the discharge port of the first-effect feed pump is connected to the feed port of the first-effect heater, the discharge ports of the first-effect heater and the first-effect separator are connected to the feed port of the first-effect circulation pump, and the discharge port of the first-effect circulation pump is connected to the feed ports of the first-effect heater and the second-effect heater;

[0007] The discharge ports of the second-effect heater and the second-effect separator are connected to the feed port of the second-effect circulating pump, and the discharge port of the second-effect circulating pump is connected to the feed port of the second-effect heater and the feed port of the triple-effect heater; the steam outlet of the triple-effect heater is connected to the feed port of the triple-effect separator, and the discharge port of the triple-effect separator is connected to the feed port of the triple-effect circulating pump and the feed port of the triple-effect discharge pump, and the discharge port of the triple-effect circulating pump is connected to the feed port of the triple-effect heater, and the discharge port of the triple-effect discharge pump is connected to the discharge pipe;

[0008] A concentration detection device is connected to the discharge pipe on the front side of the triple-effect discharge pump. The concentration detection device includes a controller, a discharge valve, and a first transformer and a second transformer vertically spaced apart on the discharge pipe. In the discharge direction, the first transformer and the second transformer are located on the front side of the triple-effect discharge pump, and the discharge valve is located on the rear side of the triple-effect discharge pump; the first transformer, the second transformer and the discharge valve are all connected to the controller, and the controller is used to control the opening and closing of the discharge valve according to the pressure difference between the first transformer and the second transformer.

[0009] In some embodiments, the discharge pipe is also connected to a raw material reflux pipe and an alkali solution reflux pipe. The raw material reflux pipe is used to transport the remaining raw material to the raw material tank. A raw material reflux valve is provided on the raw material reflux pipe, and the raw material reflux valve is connected to a controller; the alkali solution reflux pipe is used to transport the remaining alkali solution to the alkali solution tank. An alkali solution reflux valve is provided on the alkali solution reflux pipe, and the alkali solution reflux valve is connected to a controller. The controller can control the opening and closing of the raw material reflux valve and the alkali solution reflux valve according to the pressure difference between the first transformer and the second transformer.

[0010] In some embodiments, the steam inlet of the single-effect heater is connected to a steam pipe, a steam inlet regulating valve is provided on the steam pipe, a temperature sensor is provided in the middle of the single-effect heater, the temperature sensor is used to detect the temperature inside the single-effect heater, the temperature sensor is connected to the steam inlet regulating valve, and the steam inlet regulating valve can be automatically opened or closed according to the temperature inside the single-effect heater.

[0011] In some embodiments, a first material regulating valve is arranged between the discharge port of the first-effect feed pump and the feed port of the first-effect heater, and a first liquid level transmitter is arranged at the lower part of the first-effect heater. The first liquid level transmitter is used to detect the liquid level inside the first-effect heater. The first liquid level transmitter is connected to the first material regulating valve, and the first material regulating valve can be automatically opened or closed according to the liquid level inside the first-effect heater.

[0012] In some embodiments, a second material regulating valve is arranged between the discharge port of the first-effect circulation pump and the feed port of the second-effect heater, and a second liquid level transmitter is arranged at the lower part of the second-effect heater. The second liquid level transmitter is used to detect the liquid level inside the second-effect heater. The second liquid level transmitter is connected to the second material regulating valve, and the second material regulating valve can be automatically opened or closed according to the liquid level inside the second-effect heater.

[0013] In some embodiments, a third material regulating valve is arranged between the discharge port of the second-effect circulation pump and the feed port of the triple-effect heater, and a third liquid level transmitter is arranged at the lower part of the triple-effect separator. The third liquid level transmitter is used to detect the liquid level inside the triple-effect separator. The third liquid level transmitter is connected to the third material regulating valve, and the third material regulating valve can be automatically opened or closed according to the liquid level inside the triple-effect separator.

[0014] In some embodiments, a fourth material regulating valve is provided on the feed pipe, and a fourth liquid level transmitter is provided at the lower part of the four-effect heater. The fourth liquid level transmitter is used to detect the liquid level inside the four-effect heater. The fourth liquid level transmitter is connected to the fourth material regulating valve, and the fourth material regulating valve can be automatically opened or closed according to the liquid level inside the four-effect heater.

[0015] The beneficial effects of the utility model are as follows: in the utility model, by setting a concentration detection device on the discharge pipe on the front side of the triple-effect discharge pump, the concentration detection device includes a controller, a discharge valve, and a first transformer and a second transformer vertically spaced apart on the discharge pipe. In the discharge direction, the first transformer and the second transformer are located on the front side of the triple-effect discharge pump, and the discharge valve is located on the rear side of the triple-effect discharge pump; the first transformer, the second transformer and the discharge valve are all connected to the controller. When the pressure difference between the first transformer and the second transformer reaches a preset standard, that is, when the concentration of the feed liquid reaches the standard, the controller controls the discharge valve to open and discharge the qualified feed liquid, so that the production efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0017] Figure 2 It is a structural schematic diagram of a concentration detection device according to an embodiment of the utility model;

[0018] Figure 3 This is a schematic structural diagram of a first-effect heater according to an embodiment of the utility model;

[0019] Figure 4 This is a schematic structural diagram of a first-effect separator according to an embodiment of the utility model;

[0020] Figure 5 This is a schematic diagram of the structure of a two-effect heater according to an embodiment of the present utility model;

[0021] Figure 6 This is a schematic diagram of the structure of a two-effect separator in accordance with an embodiment of the present utility model;

[0022] Figure 7 This is a schematic diagram of the structure of a triple-effect heater according to an embodiment of the present utility model;

[0023] Figure 8 It is a structural schematic diagram of a triple-effect separator in one embodiment of the utility model;

[0024] Fig. 9 This is a schematic diagram of the structure of a four-effect heater according to an embodiment of the present utility model;

[0025] Fig.10 This is a schematic diagram of the structure of a four-effect separator according to the first embodiment of the utility model;

[0026] Fig.11 It is a structural schematic diagram of a condenser according to an embodiment of the utility model. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0028] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0029] Figure 1-Figure 11 The embodiment of the four-effect evaporation system with concentration detection of the utility model is shown, comprising a first-effect heater 1, a first-effect separator 2, a second-effect heater 3, a second-effect separator 4, a third-effect heater 5, a third-effect separator 6, a fourth-effect heater 7 and a fourth-effect separator 8;

[0030] The feed port 73 of the quadruple-effect heater 7 is connected to the feed pipe 40, the discharge port 74 of the quadruple-effect heater 7 and the discharge port 83 of the quadruple-effect separator 8 are connected to the feed port of the quadruple-effect circulation pump 84 and the feed port of the first-effect feed pump 16, the discharge port of the quadruple-effect circulation pump 84 is connected to the return port 75 of the quadruple-effect heater 7, the discharge port of the first-effect feed pump 16 is connected to the feed port 13 of the first-effect heater 1, the discharge port 14 of the first-effect heater 1 and the discharge port 23 of the first-effect separator 2 are connected to the feed port of the first-effect circulation pump 15, and the discharge port of the first-effect circulation pump 15 is connected to the feed port 13 of the first-effect heater 1 and the feed port 33 of the second-effect heater 3;

[0031] The discharge port 34 of the second-effect heater 3 and the discharge port 43 of the second-effect separator 4 are connected to the feed port of the second-effect circulation pump 35, and the discharge port of the second-effect circulation pump 35 is connected to the feed port 33 of the second-effect heater 3 and the feed port 53 of the triple-effect heater 5; the steam outlet 52 of the triple-effect heater 5 is connected to the feed port 62 of the triple-effect separator 6, and the discharge port 63 of the triple-effect separator 6 is connected to the feed port of the triple-effect circulation pump 54 and the feed port of the triple-effect discharge pump 55, the discharge port of the triple-effect circulation pump 54 is connected to the feed port 53 of the triple-effect heater 5, and the discharge port of the triple-effect discharge pump 55 is connected to the discharge pipe 50.

[0032] A concentration detection device 30 is connected to the discharge pipe 50 on the front side of the triple-effect discharge pump 55. The concentration detection device 30 includes a controller 301, a discharge valve 302, and a first transformer 303 and a second transformer 304 vertically spaced apart on the discharge pipe 50. In the discharge direction, the first transformer 303 and the second transformer 304 are located on the front side of the triple-effect discharge pump 55, and the discharge valve 302 is located on the rear side of the triple-effect discharge pump 55; the first transformer 303, the second transformer 304 and the discharge valve 302 are all connected to the controller 301, and the controller 301 is used to control the opening and closing of the discharge valve 302 according to the pressure difference between the first transformer 303 and the second transformer 304.

[0033] In the present invention, a concentration detection device 30 is arranged on the discharge pipe 50 at the front side of the triple-effect discharge pump 55. The concentration detection device 30 includes a controller 301, a discharge valve 302, and a first transformer 303 and a second transformer 304 arranged vertically on the discharge pipe 50. In the discharge direction, the first transformer 303 and the second transformer 304 are located at the front side of the triple-effect discharge pump 55, and the discharge valve 302 is located at the rear side of the triple-effect discharge pump 55; the first transformer 303, the second transformer 304 and the discharge valve 302 are all connected to the controller 301. When the pressure difference between the first transformer 303 and the second transformer 304 reaches the preset standard, that is, when the concentration of the feed liquid meets the standard, the controller 301 controls the discharge valve 302 to open, discharges the qualified feed liquid, and has higher production efficiency.

[0034] It should be noted that when the concentration of the feed liquid is different, the pressure difference between the first transformer 303 and the second transformer 304 will also be different. The second transformer 304 is located at the lower side of the first transformer 303. The pressure detected by the second transformer 304 is greater than the pressure detected by the first transformer 303. The difference between the second transformer 304 and the first transformer 303 is divided by the height between the second transformer 304 and the first transformer 303 to obtain the concentration of the feed liquid. Therefore, it is possible to judge whether the concentration of the feed liquid meets the standard based on the pressure difference between the first transformer 303 and the second transformer 304. The concentration standard of the feed liquid can be adjusted according to the actual production needs, and different production lines can have different standards.

[0035] In addition, the steam coming out of the steam outlet 52 of the triple-effect heater 5 is accompanied by part of the feed liquid, and the steam and the feed liquid enter the triple-effect separator 6 from the feed inlet 62 of the triple-effect separator 6. The above is an introduction to the flow process of the feed liquid in the four-effect evaporation system. The feed liquid is introduced from the feed pipe 40, and then flows and circulates among the four-effect heater 7, the four-effect separator 8, the first-effect heater 1, the first-effect separator 2, the second-effect heater 3, the second-effect separator 4, the triple-effect heater 5 and the triple-effect separator 6 in sequence, and is finally discharged from the discharge pipe 50 after the concentration is qualified. The flow process of the steam in the four-effect evaporation system is introduced in detail below in combination with the connection relationship between the equipment.

[0036] The steam inlet 11 of the first-effect heater 1 is connected to the steam pipe 10, the steam outlet 12 of the first-effect heater 1 is connected to the steam inlet 21 of the first-effect separator 2, the steam outlet 22 of the first-effect separator 2 is connected to the steam inlet 31 of the second-effect heater 3, the steam outlet 32 ​​of the second-effect heater 3 is connected to the steam inlet 41 of the second-effect separator 4, the steam outlet 42 of the second-effect separator 4 is connected to the steam inlet 51 of the triple-effect heater 5, the steam outlet 52 of the triple-effect heater 5 is connected to the feed port 62 of the triple-effect separator 6, the steam outlet 61 of the triple-effect separator 6 is connected to the steam inlet 71 of the quadruple-effect heater 7, the steam outlet 72 of the quadruple-effect heater 7 is connected to the steam inlet 81 of the quadruple-effect separator 8, the steam outlet 82 of the quadruple-effect separator 8 is connected to the steam inlet 91 of the condenser 9, and the condensation outlet 92 of the condenser 9 is connected to the return pipe 20. The steam enters the first-effect, second-effect, third-effect and fourth-effect evaporation equipment in sequence, making full use of the heat of the steam and improving the efficiency of evaporation and concentration.

[0037] In some embodiments, in combination Figure 1 and Figure 2 As shown, the discharge pipe 50 is also connected to a raw material reflux pipe 60 and an alkali solution reflux pipe 70 in a branch manner. The raw material reflux pipe 60 is used to transport the remaining raw material to the raw material tank. A raw material reflux valve 601 is provided on the raw material reflux pipe 60, and the raw material reflux valve 601 is connected to the controller 301; the alkali solution reflux pipe 70 is used to transport the remaining alkali solution to the alkali solution tank. An alkali solution reflux valve 701 is provided on the alkali solution reflux pipe 70, and the alkali solution reflux valve 701 is connected to the controller 301. The controller 301 can control the opening and closing of the raw material reflux valve 601 and the alkali solution reflux valve 701 according to the pressure difference between the first transformer 303 and the second transformer 304.

[0038] The concentration of the feed liquid can be divided into three levels, corresponding to alkaline solution, raw material and qualified feed liquid. The controller 301 can control the opening and closing of the alkaline solution reflux valve 701, the raw material reflux valve 601 and the discharge valve 302 according to different pressure differences, that is, different concentrations of the feed liquid, and discharge the feed liquid of different concentrations from different pipes to improve production efficiency.

[0039] In some embodiments, Figure 1 and Figure 3As shown, the steam inlet 11 of the first-effect heater 1 is connected to the steam pipe 10, and a steam inlet regulating valve 101 is arranged on the steam pipe 10. A temperature sensor 17 is arranged in the middle of the first-effect heater 1. The temperature sensor 17 is used to detect the temperature inside the first-effect heater 1. The temperature sensor 17 is connected to the steam inlet regulating valve 101. The steam inlet regulating valve 101 can be automatically opened or closed according to the temperature inside the first-effect heater 1. The temperature inside the first-effect heater 1 can be detected in real time by the temperature sensor 17. When the temperature reaches the preset standard, the air inlet regulating valve 101 can be controlled to close, and no new hot steam is transported into the system, which saves steam consumption. Among them, the preset standard of temperature can be adjusted according to the precipitation temperature of the corresponding feed liquid.

[0040] In some embodiments, Figure 1 and Figure 3 As shown, a first material regulating valve 18 is arranged between the discharge port of the first-effect feed pump 15 and the feed port 13 of the first-effect heater 1, and a first liquid level transmitter 19 is arranged at the lower part of the first-effect heater 1. The first liquid level transmitter 19 is used to detect the liquid level inside the first-effect heater 1. The first liquid level transmitter 19 is connected to the first material regulating valve 18, and the first material regulating valve 18 can be automatically opened or closed according to the liquid level inside the first-effect heater 1. The liquid level inside the first-effect heater 1 is detected in real time by the first liquid level transmitter 19. When the liquid level reaches a preset standard, for example, when the liquid level reaches 50%, the first material regulating valve 18 is closed, and the liquid is stopped from being transported into the first-effect heater 1, so as to prevent the liquid from being too much in the first-effect heater 1, resulting in insufficient evaporation of the liquid; when the liquid level is reduced, the first material regulating valve 18 is opened, and the liquid is continued to be transported to the first-effect heater 1, so as to ensure the normal progress of the evaporation process.

[0041] In some embodiments, Figure 1 and Figure 5 As shown, a second material regulating valve 36 is arranged between the discharge port of the first-effect circulation pump 15 and the feed port 33 of the second-effect heater 3, and a second liquid level transmitter 37 is arranged at the lower part of the second-effect heater 3. The second liquid level transmitter 37 is used to detect the liquid level inside the second-effect heater 3. The second liquid level transmitter 37 is connected to the second material regulating valve 36. The second material regulating valve 36 can be automatically opened or closed according to the liquid level inside the second-effect heater 3.

[0042] In some embodiments, Figure 1 and Figure 8As shown, a third material regulating valve 64 is arranged between the discharge port of the second-effect circulation pump 35 and the feed port 53 of the triple-effect heater 5, and a third liquid level transmitter 65 is arranged at the lower part of the triple-effect separator 6. The third liquid level transmitter 65 is used to detect the liquid level inside the triple-effect separator 6. The third liquid level transmitter 65 is connected to the third material regulating valve 64, and the third material regulating valve 64 can be automatically opened or closed according to the liquid level inside the triple-effect separator 6.

[0043] In some embodiments, Figure 1 and Fig. 9 As shown, a fourth material regulating valve 76 is provided on the feed pipe 40, and a fourth liquid level transmitter 77 is provided at the lower part of the four-effect heater 7. The fourth liquid level transmitter 77 is used to detect the liquid level inside the four-effect heater 7. The fourth liquid level transmitter 77 is connected to the fourth material regulating valve 76. The fourth material regulating valve 76 can be automatically opened or closed according to the liquid level inside the four-effect heater 7.

[0044] It should be noted that the opening and closing principles of the second material regulating valve 36 , the third material regulating valve 64 and the fourth material regulating valve 76 are the same as those of the first material regulating valve 18 , which will not be repeated here, and the corresponding liquid level standards can be adjusted according to actual conditions.

[0045] It can be seen that the utility model discloses a four-effect evaporation system with concentration detection, by setting a concentration detection device on the discharge pipe on the front side of the three-effect discharge pump, the concentration detection device includes a controller, a discharge valve, and a first transformer and a second transformer vertically spaced on the discharge pipe. In the discharge direction, the first transformer and the second transformer are located on the front side of the three-effect discharge pump, and the discharge valve is located on the rear side of the three-effect discharge pump; the first transformer, the second transformer and the discharge valve are all connected to the controller. When the pressure difference between the first transformer and the second transformer reaches the preset standard, that is, when the concentration of the feed liquid meets the standard, the controller controls the discharge valve to open and discharge the qualified feed liquid, so that the production efficiency is higher.

[0046] The above are only embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A four-effect evaporation system with concentration detection, characterized in that: It includes a single-effect heater, a single-effect separator, a double-effect heater, a double-effect separator, a triple-effect heater, a triple-effect separator, a quadruple-effect heater and a quadruple-effect separator; The feed port of the four-effect heater is connected to the feed pipe, the discharge ports of the four-effect heater and the four-effect separator are connected to the feed ports of the four-effect circulation pump and the first-effect feed pump, the discharge port of the four-effect circulation pump is connected to the return port of the four-effect heater, the discharge port of the first-effect feed pump is connected to the feed port of the first-effect heater, the discharge ports of the first-effect heater and the first-effect separator are connected to the feed port of the first-effect circulation pump, and the discharge port of the first-effect circulation pump is connected to the feed ports of the first-effect heater and the second-effect heater; The discharge ports of the second-effect heater and the second-effect separator are connected to the feed port of the second-effect circulation pump, and the discharge port of the second-effect circulation pump is connected to the feed port of the second-effect heater and the feed port of the triple-effect heater; the steam outlet of the triple-effect heater is connected to the feed port of the triple-effect separator, and the discharge port of the triple-effect separator is connected to the feed port of the triple-effect circulation pump and the feed port of the triple-effect discharge pump, and the discharge port of the triple-effect circulation pump is connected to the feed port of the triple-effect heater, and the discharge port of the triple-effect discharge pump is connected to the discharge pipe; A concentration detection device is connected to the discharge pipe on the front side of the three-effect discharge pump, and the concentration detection device includes a controller, a discharge valve, and a first transformer and a second transformer vertically spaced apart on the discharge pipe. In the discharge direction, the first transformer and the second transformer are located on the front side of the three-effect discharge pump, and the discharge valve is located on the rear side of the three-effect discharge pump; the first transformer, the second transformer and the discharge valve are all connected to the controller, and the controller is used to control the opening and closing of the discharge valve according to the pressure difference between the first transformer and the second transformer.

2. The four-effect evaporation system with concentration detection according to claim 1, characterized in that: The discharge pipe is also connected to a raw material reflux pipe and an alkali liquid reflux pipe in a branch manner. The raw material reflux pipe is used to transport the remaining raw material to the raw material tank. A raw material reflux valve is provided on the raw material reflux pipe, and the raw material reflux valve is connected to the controller; the alkali liquid reflux pipe is used to transport the remaining alkali liquid to the alkali liquid tank. An alkali liquid reflux valve is provided on the alkali liquid reflux pipe, and the alkali liquid reflux valve is connected to the controller. The controller can control the opening and closing of the raw material reflux valve and the alkali liquid reflux valve according to the pressure difference between the first transformer and the second transformer.

3. The four-effect evaporation system with concentration detection according to claim 1, characterized in that: The steam inlet of the first-effect heater is connected to a steam pipe, a steam inlet regulating valve is arranged on the steam pipe, a temperature sensor is arranged in the middle of the first-effect heater, the temperature sensor is used to detect the temperature inside the first-effect heater, the temperature sensor is connected to the steam inlet regulating valve, and the steam inlet regulating valve can be automatically opened or closed according to the temperature inside the first-effect heater.

4. The four-effect evaporation system with concentration detection according to claim 1, characterized in that: A first material regulating valve is arranged between the discharge port of the first-effect feed pump and the feed port of the first-effect heater, and a first liquid level transmitter is arranged at the lower part of the first-effect heater. The first liquid level transmitter is used to detect the liquid level inside the first-effect heater. The first liquid level transmitter is connected to the first material regulating valve, and the first material regulating valve can be automatically opened or closed according to the liquid level inside the first-effect heater.

5. The four-effect evaporation system with concentration detection according to claim 4, characterized in that: A second material regulating valve is arranged between the discharge port of the first-effect circulation pump and the feed port of the second-effect heater. A second liquid level transmitter is arranged at the lower part of the second-effect heater. The second liquid level transmitter is used to detect the liquid level inside the second-effect heater. The second liquid level transmitter is connected to the second material regulating valve. The second material regulating valve can be automatically opened or closed according to the liquid level inside the second-effect heater.

6. The four-effect evaporation system with concentration detection according to claim 5, characterized in that: A third material regulating valve is arranged between the discharge port of the second-effect circulation pump and the feed port of the triple-effect heater, and a third liquid level transmitter is arranged at the lower part of the triple-effect separator. The third liquid level transmitter is used to detect the liquid level inside the triple-effect separator. The third liquid level transmitter is connected to the third material regulating valve, and the third material regulating valve can be automatically opened or closed according to the liquid level inside the triple-effect separator.

7. The four-effect evaporation system with concentration detection according to claim 6, characterized in that: A fourth material regulating valve is arranged on the feed pipe, and a fourth liquid level transmitter is arranged at the lower part of the four-effect heater. The fourth liquid level transmitter is used to detect the liquid level inside the four-effect heater. The fourth liquid level transmitter is connected to the fourth material regulating valve, and the fourth material regulating valve can be automatically opened or closed according to the liquid level inside the four-effect heater.

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