MVR (Mechanical Vapor Recompression) evaporating crystallizer

Abstract

The utility model provides an MVR (Mechanical Vapor Recompression) evaporation crystallizer, which relates to the technical field of evaporation crystallization and comprises an evaporator and a separator, the outer surface of the evaporator is fixedly communicated with a delivery pipe I, one end of the delivery pipe I far away from the evaporator is fixedly communicated with the separator, and a stirring mechanism is arranged in the separator. A second conveying pipe fixedly communicates with the interior of the separator, and the end, away from the separator, of the second conveying pipe fixedly communicates with a compressor. And the stirring mechanism comprises a motor, the output end of the motor is fixedly connected with a fixing rod, and the inner top wall of the separator is fixedly connected with a fixing cylinder. According to the MVR evaporation crystallizer, through the arranged stirring mechanism, concentrated liquid in the separator can be stirred, the contact area of the concentrated liquid and the cavity in the separator can be increased, the evaporation efficiency can be improved, the concentration of the concentrated liquid can be kept uniform, the overall evaporation and crystallization efficiency can be improved, and the situation that the discharging pipe is blocked due to the fact that large crystals are formed is avoided.

Description

Technical Field

[0001] The utility model relates to a crystallizer, in particular to an MVR evaporation crystallizer, and belongs to the technical field of evaporation crystallization. Background Art

[0002] Mechanical vapor recompression technology, referred to as MVR, MVR evaporation crystallization system is a technology developed to reduce the huge energy consumption of condensed water in the concentration process and the reuse of secondary steam. The MVR evaporation crystallization system is mainly composed of an evaporation chamber, a gas-liquid separator, a steam compressor, etc. The core equipment of the MVR evaporation crystallization system is a mechanical steam compressor. When designing the MVR evaporation crystallization system, the secondary steam generated during the evaporation and concentration of the material solution treated with residual heat in the forced circulation evaporation chamber will be considered. Through the gas-liquid separator at the top of the evaporation chamber, under the separation effect of the gas-liquid separator, the secondary steam is sent to the mechanical steam compressor. The mechanical steam compressor pressurizes and compresses this secondary steam, thereby increasing the steam pressure and temperature to meet the standard for reuse. The existing evaporation crystallizer is usually divided into two parts, one part is an evaporator, which needs to continuously heat the wastewater first, and the wastewater boils to generate steam and use the condensation end to condense the steam into condensed water and discharge it from the evaporator. The other part is a crystallizer, and the concentrated wastewater in the evaporator is injected into the crystallizer for continuous heating. When the solution is supersaturated, crystals can be precipitated to achieve the crystallization effect.

[0003] When the evaporation crystallizer is crystallizing, the contact area between the material and the chamber is small, resulting in a slow rate of steam generation, which affects the concentration efficiency of the material. In addition, the material cannot be turned over during the crystallization process, and the part with a higher concentration is prone to agglomeration and adhere to the inner wall of the separator, which not only affects the evaporation efficiency, but also causes the discharge pipe to be blocked if the crystals are too large. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] The purpose of the utility model is to provide an MVR evaporation crystallizer in order to solve the above problems, so as to solve the problems in the prior art that the solution generates steam slowly, is unable to turn over during crystallization, is prone to agglomeration or form larger crystals, and causes blockage of the discharge pipe.

[0006] (II) Technical solution

[0007] The utility model is realized through the following technical scheme: MVR evaporation crystallizer.

[0008] It includes an evaporator and a separator. The outer surface of the evaporator is fixedly connected with a delivery pipe 1, and the end of the delivery pipe 1 away from the evaporator is fixedly connected with the separator. The separator is provided with a stirring mechanism inside. The inside of the separator is fixedly connected with a delivery pipe 2, and the end of the delivery pipe 2 away from the separator is fixedly connected with a compressor. The setting of the compressor can compress and heat the secondary steam formed in the separator, and then transport it to the heat exchanger for repeated use as a heat source.

[0009] The stirring mechanism includes a motor, the output end of the motor is fixedly connected to a fixed rod, the inner top wall of the separator is fixedly connected to a fixed cylinder, the outer surface of the fixed cylinder is fixedly connected to a gear 1, the outer surface of the gear 1 is meshed with two symmetrical gear 2s, the bottom surface of each gear 2 is fixedly connected to a rotating rod, the bottom end of the rotating rod passes through the fixed rod and extends to the bottom of the fixed rod, the outer surface of the rotating rod is rotatably connected to the fixed rod, and the outer surface of each rotating rod is fixedly connected to a stirring blade.

[0010] Preferably, the outer surface of the output end of the motor is rotatably connected to the inner wall of the fixing cylinder.

[0011] Preferably, a set of scrapers are fixedly connected to the outer surface of each stirring blade, and the outer surface of the motor is fixedly connected to the upper surface of the separator. The arrangement of the scrapers can scrape off the crystals attached to the inner wall of the separator to prevent affecting the evaporation efficiency of the concentrated liquid.

[0012] The above-mentioned evaporator is provided with a heat exchanger inside, a liquid distributor is provided above the heat exchanger, and an evaporation chamber and a liquid storage chamber are provided below the heat exchanger. The material is distributed to each heat exchange tube of the heat exchanger through the liquid distributor in the evaporator, and forms a uniform liquid film along the inner wall of the heat exchange tube. The liquid film in the tube is heated by the heating steam inside the heat exchanger during the downward flow, boils and evaporates when flowing downward, and the steam formed by the partial evaporation of the material at the bottom of the heat exchanger is distributed in the evaporation chamber, and the formed liquid flows into the liquid storage chamber.

[0013] Preferably, a delivery pipe 3 is fixedly connected between the output end of the compressor and the heat exchanger, the delivery pipe 3 penetrates the outer surface of the evaporator and extends to the inside of the evaporator, a feeding pipe is fixedly connected to the upper surface of the evaporator, a preheater is fixedly connected to the end of the feeding pipe away from the evaporator, and a filter is arranged at the input end of the preheater. The preheater can preheat the material to the evaporation temperature in advance to accelerate the evaporation speed of the material.

[0014] Preferably, the outer surface of the evaporator is fixedly connected to a condensed water pipe, and the bottom surface of the separator is fixedly connected to a concentrated liquid output pipe.

[0015] The utility model provides an MVR evaporation crystallizer, which has the following beneficial effects:

[0016] 1. The MVR evaporation crystallizer can stir the concentrated liquid in the separator through the stirring mechanism, which can not only increase the contact area between the concentrated liquid and the cavity in the separator, accelerate the speed of steam generation, and improve the concentration efficiency of the material, but also keep its concentration uniform and improve the overall evaporation crystallization efficiency.

[0017] 2. The MVR evaporation crystallizer can scrape off the crystals attached to the inner wall of the separator through the stirring blades and scrapers set in the stirring mechanism, and then break them up, further improving the overall evaporation and crystallization efficiency, avoiding the formation of large crystals, and preventing the discharge pipe from being blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the front view of the utility model;

[0019] Figure 2 It is a cross-sectional view of the interior of the evaporator of the utility model;

[0020] Figure 3 It is a schematic diagram of the three-dimensional structure inside the separator of the utility model;

[0021] Figure 4 It is an exploded view of the stirring mechanism of the utility model.

[0022] Description of Reference Numerals

[0023] 1. Evaporator; 101. Heat exchanger; 102. Liquid distributor; 103. Evaporation chamber; 104. Liquid storage chamber;

[0024] 2. Separator; 3. Delivery pipe 1;

[0025] 4. stirring mechanism; 401. motor; 402. fixing rod; 403. fixing cylinder; 404. gear 1; 405. gear 2; 406. rotating rod; 407. stirring blade; 408. scraper;

[0026] 5. Delivery pipe 2; 6. Compressor; 7. Delivery pipe 3; 8. Feeding pipe; 9. Preheater; 10. Filter; 11. Concentrate output pipe; 12. Condensate pipe. DETAILED DESCRIPTION

[0027] The utility model embodiment provides an MVR evaporation crystallizer.

[0028] See also Figure 1 , Figure 2 , Figure 3 and Figure 4, including an evaporator 1 and a separator 2, the outer surface of the evaporator 1 is fixedly connected with a delivery pipe 3, the end of the delivery pipe 3 away from the evaporator 1 is fixedly connected with the separator 2, the interior of the separator 2 is fixedly connected with a delivery pipe 5, and the end of the delivery pipe 5 away from the separator 2 is fixedly connected with a compressor 6;

[0029] Please refer to Figure 1 and Figure 2 , a heat exchanger 101 is arranged inside the evaporator 1, a liquid distributor 102 is arranged above the heat exchanger 101, and an evaporation chamber 103 and a liquid storage chamber 104 are arranged below the heat exchanger 101. The material is distributed to each heat exchange tube of the heat exchanger 101 through the liquid distributor 102 in the evaporator 1, and forms a uniform liquid film along the inner wall of the heat exchange tube. The liquid film in the tube is heated by the heating steam inside the heat exchanger 101 during the downward flow, boils and evaporates when flowing downward, and the steam formed by the partial evaporation of the material at the bottom of the heat exchanger 101 is distributed in the evaporation chamber 103, and the formed liquid flows into the liquid storage chamber 104.

[0030] A delivery pipe 3 7 is fixedly connected between the output end of the compressor 6 and the heat exchanger 101. The delivery pipe 3 7 penetrates the outer surface of the evaporator 1 and extends to the inside of the evaporator 1. The secondary steam generated in the separator 2 is delivered to the compressor 6 through the delivery pipe 2 5. The compressor 6 can compress the secondary steam and heat it up before delivering it to the heat exchanger 101 for use as the heat source of the evaporator 1.

[0031] The upper surface of the evaporator 1 is fixedly connected with a feeding pipe 8, and one end of the feeding pipe 8 away from the evaporator 1 is fixedly connected with a preheater 9, and a filter 10 is provided at the input end of the preheater 9. The material is first transported to the filter 10 by a feed pump, and then transported to the preheater 9 for heating after impurities are removed. After being preheated to the evaporation temperature, the material is transported to the evaporator 1 through the feeding pipe 8.

[0032] The outer surface of the evaporator 1 is fixedly connected to a condensed water pipe 12 , and the bottom surface of the separator 2 is fixedly connected to a concentrated liquid output pipe 11 .

[0033] Please refer to Figure 1 , Figure 3 and Figure 4A stirring mechanism 4 is provided inside the separator 2, and the stirring mechanism 4 includes a motor 401, and the output end of the motor 401 is fixedly connected to a fixed rod 402, and the inner top wall of the separator 2 is fixedly connected to a fixed cylinder 403, and the outer surface of the fixed cylinder 403 is fixedly connected to a gear 1 404, and the outer surface of the gear 1 404 is meshed with two symmetrical gear 2s 405, and the bottom surface of each gear 2 405 is fixedly connected to a rotating rod 406, and the bottom end of the rotating rod 406 passes through the fixed rod 402 and extends to the bottom of the fixed rod 402, and the outer surface of the rotating rod 406 is rotatably connected to the fixed rod 402, and the outer surface of each rotating rod 406 is fixedly connected to a stirring sheet 407. Starting the motor 401 in the stirring mechanism 4 can cause the fixed rod 402 to rotate, thereby driving the rotating rod 406 and the stirring blade 407 to rotate. At the same time, when the rotating rod 406 rotates, the gear 2 405 can rotate along the gear 1 404, and then the gear 2 405 can drive the rotating rod 406 and the stirring blade 407 to achieve self-rotation, which can stir the concentrated liquid in the separator 2. On the one hand, it can increase the contact area between the concentrated liquid and the cavity in the separator 2 and improve the evaporation efficiency. On the other hand, it can also maintain its concentration uniform and avoid the formation of large crystals. It can not only improve the overall evaporation and crystallization efficiency, but also avoid clogging of the discharge pipe.

[0034] The outer surface of the output end of the motor 401 is rotatably connected to the inner wall of the fixing cylinder 403 .

[0035] A set of scrapers 408 are fixedly connected to the outer surface of each stirring blade 407 .

[0036] The outer surface of the motor 401 is fixedly connected to the upper surface of the separator 2 .

[0037] When the utility model is in use, the material is first transported to the filter 10 through the feed pump, and after the impurities are removed, it is transported to the preheater 9 for heating. After being preheated to the evaporation temperature, the material is transported to the evaporator 1 through the feed pipe 8, and the material is distributed to each heat exchange tube of the heat exchanger 101 through the liquid distributor 102 in the evaporator 1, and a uniform liquid film is formed along the inner wall of the heat exchange tube. The liquid film in the tube is secondary heated by the heating steam inside the heat exchanger 101 during the downward flow, and boils and evaporates when flowing downward. The steam formed by the partial evaporation of the material at the bottom of the heat exchanger 101 is distributed in the evaporation chamber 103, and the formed liquid flows into the liquid storage chamber 104, and then passes through the transport pipe 1-3 transports the liquid storage chamber 104 to the separator 2, and starts the motor 401 in the stirring mechanism 4, which can rotate the fixed rod 402, thereby driving the rotating rod 406 and the stirring blade 407 to rotate. At the same time, when the rotating rod 406 rotates, the gear 2 405 can rotate along the gear 1 404, and then the gear 2 405 can drive the rotating rod 406 and the stirring blade 407 to achieve self-rotation, which can stir the concentrated liquid in the separator 2. On the one hand, it can increase the contact area between the concentrated liquid and the cavity in the separator 2 and improve the evaporation efficiency. On the other hand, it can also maintain its concentration uniform and avoid the formation of large crystals. It can not only improve the overall evaporation and crystallization efficiency, but also avoid clogging of the discharge pipe.

[0038] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. MVR evaporation crystallizer, including an evaporator (1) and a separator (2), Features: The outer surface of the evaporator (1) is fixedly connected to a delivery pipe 1 (3); the end of the delivery pipe 1 (3) away from the evaporator (1) is fixedly connected to the separator (2); a stirring mechanism (4) is provided inside the separator (2); the interior of the separator (2) is fixedly connected to a delivery pipe 2 (5); the end of the delivery pipe 2 (5) away from the separator (2) is fixedly connected to a compressor (6); the stirring mechanism (4) comprises a motor (401); the output end of the motor (401) is fixedly connected to a fixing rod (402); the inner top wall of the separator (2) is fixedly connected to the compressor (6); A fixed cylinder (403) is connected, and a gear 1 (404) is fixedly connected to the outer surface of the fixed cylinder (403), and two symmetrical gear 2s (405) are meshed on the outer surface of the gear 1 (404), and the bottom surface of each gear 2 (405) is fixedly connected to a rotating rod (406), and the bottom end of the rotating rod (406) passes through the fixed rod (402) and extends to the bottom of the fixed rod (402), and the outer surface of the rotating rod (406) is rotatably connected to the fixed rod (402), and the outer surface of each rotating rod (406) is fixedly connected to a stirring blade (407).

2. The MVR evaporation crystallizer according to claim 1, Features: The outer surface of the output end of the motor (401) is rotatably connected to the inner wall of the fixed cylinder (403).

3. The MVR evaporation crystallizer according to claim 1, Features: A group of scrapers (408) are fixedly connected to the outer surface of each stirring blade (407), and the outer surface of the motor (401) is fixedly connected to the upper surface of the separator (2).

4. The MVR evaporation crystallizer according to claim 1, Features: A heat exchanger (101) is arranged inside the evaporator (1), a liquid distributor (102) is arranged above the heat exchanger (101), and an evaporation chamber (103) and a liquid storage chamber (104) are respectively arranged below the heat exchanger (101).

5. The MVR evaporation crystallizer according to claim 1, Features: A delivery pipe three (7) is fixedly connected between the output end of the compressor (6) and the heat exchanger (101); the delivery pipe three (7) penetrates the outer surface of the evaporator (1) and extends into the interior of the evaporator (1); a feeding pipe (8) is fixedly connected to the upper surface of the evaporator (1); an end of the feeding pipe (8) away from the evaporator (1) is fixedly connected to a preheater (9); and a filter (10) is provided at the input end of the preheater (9).

6. The MVR evaporation crystallizer according to claim 1, Features: The outer surface of the evaporator (1) is fixedly connected to a condensed water pipe (12), and the bottom surface of the separator (2) is fixedly connected to a concentrated liquid output pipe (11).

Images