Recovery device based on MVR system
By optimizing the preheating heat exchanger and induced draft fan of the MVR system, and combining them with the controller and pressure sensor, the problem of unstable concentrate concentration and storage tank pressure was solved, thereby achieving increased concentrate concentration and stable storage tank pressure, and achieving the goal of energy conservation and emission reduction.
Patent Information
- Application Number
- CN202520011586.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-03
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-01-03
AI Technical Summary
Existing MVR systems have limited concentrate concentration in nylon polymerization production, which leads to the need for additional evaporation treatment in subsequent production. Furthermore, the unstable pressure in the storage tank affects system efficiency and energy consumption.
By introducing a preheating heat exchanger, a induced draft fan, and a concentrate delivery pump, combined with a controller and pressure sensor, the concentration of the concentrate and the pressure of the storage tank are optimized. The flash evaporation effect is used to increase the concentration of the concentrate and to preheat the extraction water, thereby reducing water loss and pressure fluctuations.
The concentration of the concentrate was increased to 90%, which reduced the subsequent evaporation load, saved production costs, stabilized the storage tank pressure, and achieved the effect of energy conservation and emission reduction.
Smart Images
Figure CN223831804U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a recycling device based on an MVR system. Background Technology
[0002] The MVR system is a relatively advanced recovery system in existing nylon polymerization production. It utilizes mechanical recompression of steam to heat itself, effectively achieving the circulation of steam, water, and concentrate, thus achieving energy conservation and emission reduction. However, it has the following drawbacks:
[0003] 1. The MVR system has limited ability to concentrate extracted water, reaching only about 70%. Further increasing the concentration would cause the compressor energy consumption to rise sharply, which would be counterproductive.
[0004] 2. The concentrate storage tank is connected to the MVR system. The high back pressure inside the tank causes a high negative pressure in the discharge pump of the MVR system.
[0005] 3. Because the concentration ratio can only reach 70%, there is still 30% water in the extract concentrate that needs to be evaporated in subsequent production, which not only consumes additional energy, but also requires additional water replenishment.
[0006] 4. The concentrate storage tank is directly connected to the MVR system, and its internal pressure will fluctuate with the pressure fluctuation of the MVR system. Utility Model Content
[0007] The technical problem to be solved by this utility model is to provide a recovery device based on an MVR system, which increases the concentration of the concentrate and reduces the evaporation load of the concentration vessel in subsequent production.
[0008] This utility model is implemented as follows: a recycling device based on an MVR system, including an MVR system, the MVR system having an inlet and an outlet, extraction water connected to the inlet, the MVR system including a condensate collection tank, and further including: a preheating heat exchanger, a induced draft fan, a concentrate delivery pump, and a concentrate storage tank.
[0009] The extraction water is connected to the inlet of the MVR system through the preheating heat exchanger, and the outlet of the MVR system is connected to the concentrate storage tank through the concentrate delivery pump; the preheating heat exchanger has an inlet and an outlet, the top of the concentrate storage tank is connected to the inlet through a duct fan, and the outlet is connected to the condensate collection tank.
[0010] Furthermore, it also includes a controller and a pressure sensor, the pressure sensor being located inside the concentrate storage tank, and the controller being electrically connected to the pressure sensor, the concentrate delivery pump, and the evacuation fan.
[0011] The advantages of this utility model are:
[0012] 1. Increased concentration of concentrate, reducing evaporation load on the concentration vessel in subsequent production;
[0013] 2. More condensate is recovered, reducing water loss in the MVR system and saving production costs;
[0014] 3. The extraction water was preheated, which reduced the load on the MVR system compressor and achieved the goal of energy saving and emission reduction;
[0015] 4. Control the frequency of the induced draft fan to ensure stable control of the tank pressure. Attached Figure Description
[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0017] Figure 1 This is a schematic diagram of a recycling device based on an MVR system according to this utility model. Detailed Implementation
[0018] Please see Figure 1 As shown, this utility model discloses a recycling device based on an MVR system, including an MVR system 1. The MVR system 1 is provided with an inlet 11 and an outlet 12. Extraction water is connected to the inlet 11. The MVR system 1 includes a condensate collection tank 13. The recycling device also includes a preheating heat exchanger 2, a induced draft fan 3, a concentrate delivery pump 4, and a concentrate storage tank 5.
[0019] The extraction water is connected to the inlet 11 of the MVR system 1 through the preheating heat exchanger 2, and the outlet 12 of the MVR system 1 is connected to the concentrate storage tank 5 through the concentrate transfer pump 4. The preheating heat exchanger 2 is provided with an inlet 21 and an outlet 22. The top of the concentrate storage tank 5 is connected to the inlet 21 through a duct fan 3, and the outlet 22 is connected to the condensate collection tank 13 to collect the condensate in it to the MVR system, thereby reducing the water loss during MVR. By introducing water vapor from the concentrate storage tank 5 into the preheating heat exchanger 2, not only is the concentration of the concentrate in the concentrate storage tank 5 increased, but it can also be used to heat the extraction water in the preheating heat exchanger 2, so that the extraction water is heated before entering the MVR system 1.
[0020] In this embodiment, preferably, it also includes a controller (not shown) and a pressure sensor 6. The pressure sensor 6 is located inside the concentrate storage tank 5. The controller is electrically connected to the pressure sensor 6, the concentrate delivery pump 4, and the evacuation fan 3. The controller is a microcontroller or PC purchased directly from the market. By obtaining the pressure sensor 6 through the controller, the operating frequency of the concentrate delivery pump 4 and the operating frequency of the evacuation fan 3 can be controlled to ensure the internal pressure of the concentrate storage tank 5 is stable and to promptly extract the water vapor.
[0021] The pressure of the concentrate storage tank 5 is reduced by the induced draft fan 3, so that the concentrate pumped out of the MVR system 1 (at this time the concentration is 70%) will produce a flash evaporation effect when it enters the concentrate storage tank 5, further releasing water vapor and increasing the concentration of the concentrate (at this time the concentration can reach about 90%). The water vapor generated by the flash evaporation is used to preheat the extraction water entering the MVR system 1.
[0022] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0023] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.
Claims
1. A recycling device based on an MVR system, comprising an MVR system, the MVR system having an inlet and an outlet, extraction water connected to the inlet, the MVR system including a condensate collection tank, characterized in that: Also includes: Preheating heat exchanger, induced draft fan, concentrate transfer pump, and concentrate storage tank; The extraction water is connected to the inlet of the MVR system through the preheating heat exchanger, and the outlet of the MVR system is connected to the concentrate storage tank through the concentrate delivery pump; the preheating heat exchanger has an inlet and an outlet, the top of the concentrate storage tank is connected to the inlet through a duct fan, and the outlet is connected to the condensate collection tank.
2. The recycling device based on an MVR system as described in claim 1, characterized in that: It also includes a controller and a pressure sensor, the pressure sensor being located inside the concentrate storage tank, and the controller being electrically connected to the pressure sensor, the concentrate delivery pump, and the evacuation fan.