Energy-saving device for recovering high-concentration nitryl mother liquor

Abstract

The utility model relates to the technical field of nitryl mother liquor recovery and energy conservation, in particular to a high-concentration nitryl mother liquor recovery and energy conservation device. Comprising a supporting cylinder, a supporting beam is arranged on the top face of a supporting cylinder body, a motor is arranged on the supporting beam, an output shaft of a motor body is connected with a shaft rod, the shaft rod is located in an inner cavity of the reaction kettle, and the inner cavity of the supporting cylinder body is sleeved with a reaction kettle body; a scraping plate is fixedly arranged on the shaft rod body, a plurality of teeth are arranged on the outer side surface of the scraping plate body, and the teeth are used for scraping mixed scale on the inner wall of the reaction kettle; the cleaning efficiency of the teeth on inner wall polymer scaling is improved, the temperature difference stability is improved, the recycling value of the teeth as a low-grade heat source is increased, the evaporation time is shortened, unit energy consumption is reduced, and the energy utilization rate and economic benefits of multi-effect evaporation are improved.

Description

Technical Field

[0001] This utility model relates to the field of energy-saving technology for nitro mother liquor recovery, and in particular to an energy-saving device for high-concentration nitro mother liquor recovery. Background Technology

[0002] In the production processes of fine chemicals, pesticides, and dye intermediates, high-concentration nitro organic matter mother liquors (such as wastewater containing derivatives like nitrobenzene, nitrobenzene, nitrobenzene, and dinitrotoluene) are often generated. These mother liquors face severe challenges in treatment and resource recovery: 1. High pollutant concentration and toxicity: Nitro compounds typically have high chemical oxygen demand (COD), high biotoxicity, and potential carcinogenic risks. 2. High salt content: Inorganic salts (such as sodium sulfate and sodium ammonium chloride) are often introduced or generated during production, resulting in mother liquors that are typically complex systems with high salt and high organic matter content, easily leading to equipment corrosion, scaling, and blockage. 3. Resource waste: Mother liquors contain unreacted raw materials, target products, or byproducts; direct disposal not only pollutes the environment but also represents a loss of valuable resources.

[0003] Traditional mother liquor treatment methods include: Incineration: Thorough treatment, but extremely high energy consumption (especially for mother liquor with high water content), expensive operating costs, and potential generation of secondary pollutants such as dioxins. It also requires a complex and costly exhaust gas treatment system. Adsorption / extraction: Suitable for low-concentration or specific component recovery, but poorly applicable to complex, high-salt, and high-concentration mother liquors. Regeneration is difficult, and it easily generates secondary solid waste. Advanced oxidation: High operating costs, low oxidation efficiency for high-concentration mother liquors, and potential generation of more toxic intermediate products. Multi-effect evaporation: This technology efficiently concentrates and reduces volume, effectively separates wastewater from valuable components, and maximizes resource recovery (such as inorganic salts or concentrated organic matter). It is key to achieving environmentally friendly and economically feasible treatment of high-concentration nitro mother liquor. With its core advantages of high efficiency, energy saving, and concentration, multi-effect evaporation technology has become the preferred process for this type of mother liquor treatment and resource recovery project.

[0004] The core of multi-effect evaporation technology lies in utilizing the high latent heat of water vapor to achieve cascaded energy transfer and efficient reuse across multiple evaporation units. Heating steam (live steam) enters the heating chamber of the first effect, heating the liquid flowing within the tubes. The liquid boils, generating a large amount of secondary steam. This secondary steam from the first effect is used as the heat source for the second effect's heating chamber. Similarly, the secondary steam from the second effect drives the third effect, and so on. Each effect operates at a lower pressure (and therefore a lower boiling point) than the previous one, ensuring that the secondary steam from the previous effect effectively heats the liquid in the next effect. Multi-effect evaporation is naturally suitable for concentrating high-salt solutions. Nitro compounds and accompanying inorganic salts (especially ammonia ions) are highly corrosive; high salt and high organic matter content easily leads to severe scaling, and due to the multi-stage heating process, temperature fluctuations further exacerbate scaling.

[0005] Therefore, this application provides an energy-saving device for high-concentration nitro mother liquor recovery to solve the problems mentioned in the background art. Utility Model Content

[0006] The purpose of this invention is to provide an energy-saving device for high-concentration nitro mother liquor recovery, which solves the problems of existing multi-stage multi-effect evaporation heating, temperature fluctuations, easy crystallization and scaling, and increased energy consumption.

[0007] To solve the above-mentioned technical problems, this utility model provides an energy-saving device for high-concentration nitro mother liquor recovery, including a support cylinder, a support beam set on the top surface of the support cylinder body, a motor set on the support beam, the output shaft of the motor body connected to a shaft rod, the shaft rod being located in the inner cavity of the reactor, and the reactor body being fitted into the inner cavity of the support cylinder; a scraper is fixedly set on the shaft rod body, and several teeth are set on the outer side of the scraper body, the teeth being used to scrape off the scale on the inner wall of the reactor.

[0008] A further improvement of the present invention is that the scraper also includes an upper scraper and a lower scraper. The upper scraper is an inverted trapezoidal frame, and the upper and lower middle parts of the upper scraper body are fitted and fixed by through holes provided on the shaft.

[0009] A further improvement of this utility model is that the lower scraper is a U-shaped frame structure, with the top surface of the U-shaped frame abutting and fixed to the bottom surface of the upper scraper, and the middle part of the bottom scraper in the lower scraper is adapted to be engaged with the limiting groove set at the bottom end of the shaft for fixation.

[0010] A further improvement of this utility model is that: several teeth are staggered on the two outer sides of the U-shaped frame of the lower scraper body, and several teeth are evenly arranged on the bottom surface of the bottom scraper in the lower scraper, and the teeth are conical.

[0011] A further improvement of the present invention is that the inner cavity of the reactor body is composed of an upper conical body and a lower cylindrical body, and its scraper is adapted to fit the inner cavity of the reactor.

[0012] A further improvement of this utility model is that: the lower part of the reactor body is provided with an inlet pipe and an outlet pipe, and the bottom surface of the reactor body is provided with a fan-shaped perforation, which is sealed and connected to the outlet, and the outlet is connected to the outlet pipe.

[0013] A further improvement of this utility model is that the gap between the support cylinder and the reactor is fixed, and the gap between the two forms a sealed heat-insulating cavity. The support cylinder body is respectively equipped with a control box, a temperature inlet pipe, a temperature outlet pipe and a pressure relief port.

[0014] A further improvement of this utility model is that a lower scraper is provided inside the lower cylinder, and the lower scraper body has teeth.

[0015] A further improvement of this utility model is that support legs are provided at the bottom of the support cylinder body.

[0016] By adopting the above technical solution, this utility model has the following beneficial effects:

[0017] 1. This utility model provides an energy-saving device for high-concentration nitro mother liquor recovery. By setting teeth on the scraper, the sharp edges of the teeth form a local high-pressure zone when rotating close to the reactor wall, generating a stronger shearing effect on the adhesion layer. This point-like concentrated force can efficiently peel off hardened scale (such as polymer residues and crystals). In the reactor, the tooth structure can increase the removal rate of polymer scale on the inner wall by about 30%.

[0018] 2. This utility model provides a high-concentration nitro mother liquor recovery energy-saving device. The rotating blades continuously scrape the inner wall, disrupting the environment for scale formation and reducing the scaling rate by 40%–60%. This increases temperature stability, raises the temperature of the unused secondary steam by 3°C–5°C, and increases its reuse value as a low-grade heat source. It also shortens evaporation time and reduces unit energy consumption. In a four-effect evaporation system, the blades reduce steam consumption to 0.25 tons / ton of water (generally 0.3 tons). Treating 100,000 tons of wastewater annually can save 1.35 million yuan in steam costs, significantly improving the energy utilization rate and economic benefits of multi-effect evaporation. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 A schematic diagram of an energy-saving device for recovering high-concentration nitro mother liquor;

[0021] Figure 2 A schematic diagram of an energy-saving device for recovering high-concentration nitro mother liquor;

[0022] Figure 3 A schematic cross-sectional view of an energy-saving device for recovering high-concentration nitro mother liquor;

[0023] Figure 4 A schematic cross-sectional view of an energy-saving device for recovering high-concentration nitro mother liquor;

[0024] Figure 5 for Figure 4 A magnified schematic diagram of a portion of the scraper structure;

[0025] Figure 6for Figure 5 A partially enlarged schematic diagram of the lower scraper structure;

[0026] Figure 7 for Figure 6 A partially enlarged schematic diagram of the bottom scraper structure.

[0027] Reference numerals in the attached diagram: 1. Support cylinder; 2. Control box; 3. Motor; 4. Support beam; 5. Support leg; 6. Pressure relief port; 7. Temperature inlet pipe; 8. Temperature outlet pipe; 9. Feed pipe; 10. Discharge pipe; 11. Reactor; 12. Insulation cavity; 13. Discharge port; 14. Shaft; 15. Scraper; 16. Perforation; 17. Upper scraper; 18. Lower scraper; 19. Teeth; 20. Limiting groove; 21. Bottom scraper. Detailed Implementation

[0028] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship 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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] The present invention will be further explained below with reference to specific embodiments.

[0032] like Figures 1-7As shown, this embodiment provides an energy-saving device for high-concentration nitro mother liquor recovery, including a support cylinder 1. A support beam 4 is provided on the top surface of the support cylinder 1, and a motor 3 is provided on the support beam 4. The output shaft of the motor 3 is connected to a shaft 14, which is located in the inner cavity of a reaction vessel 11. The reaction vessel 11 is fitted into the inner cavity of the support cylinder 1. A scraper 15 is fixedly provided on the shaft 14, and several teeth 19 are provided on the outer surface of the scraper 15. The teeth 19 are used to scrape the reaction vessel 11. 1. Scale on the inner wall; The inner cavity of the reactor 11 is a sealed cylinder consisting of an upper conical body (not shown in the figure) and a lower cylindrical body (not shown in the figure). The scraper 15 is adapted to fit the inner cavity of the reactor 11. A lower scraper 18 is provided in the lower cylindrical body. The lower scraper 18 has teeth 19 on its body. Several teeth 19 are staggered on the two outer sides of the U-shaped frame of the lower scraper 18 body. Several teeth 19 are evenly provided on the bottom surface of the bottom scraper 21 in the lower scraper 18. The teeth 19 are conical. Specifically, the support cylinder 1 serves as the outer support and insulation layer. A support beam 4 is installed on the top surface of the support cylinder 1. The support beam 4 supports and fixes the motor 3. The motor 3 is a cycloidal pinwheel reducer motor used to drive the scraper 15 fixed on the shaft 14 to rotate in the reactor 11. The reactor 11 is sealed inside the support cylinder 1. The shaft 14 is sealed inside the reactor 11. The scraper 15 is fixed on the shaft 14. Several teeth 19 are respectively provided on the lower scraper 18 at the bottom of the scraper 15. The rotating shaft 14 drives the scraper 15 and the teeth 19 to rotate along the inner wall of the reactor 11. The reactor 11 has a structure consisting of an upper conical cylinder and a lower cylindrical cylinder. The scraper 15 is adapted to fit into the inner cavity of the reactor 11. The lower scraper is set in the lower cylindrical body of the reactor 11. The scraper 18 has a U-shaped frame body. Several teeth 19 are staggered on the two outer sides of the U-shaped frame body of the scraper 18 body. The staggered arrangement of several teeth 19 on the two outer sides increases the area and efficiency of tooth descaling. Several teeth 19 are evenly arranged on the bottom surface of the bottom scraper 21 at the bottom of the scraper 15 body. The teeth 19 are conical. The upper scraper 17 in the scraper 15 is adapted to the rotation of the upper conical cylinder, and the lower scraper 18 is adapted to the rotation of the lower cylinder. The teeth 19 are set on the lower scraper 18. The teeth 19 are used to scrape off the scale on the inner wall of the reactor 11. When the sharp edges of the teeth rotate close to the reactor wall, they form a local high-pressure zone, which generates a stronger shearing effect on the adhesion layer. The tooth structure in the reactor can improve the removal rate of polymer scale on the inner wall by about 30%.

[0033] like Figures 3-7As shown, in this embodiment, the scraper 15 further includes an upper scraper 17 and a lower scraper 18. The upper scraper 17 is an inverted trapezoidal frame, and the upper and lower middle parts of the upper scraper 17 are fitted and fixed by through holes 16 provided on the shaft 14. The lower scraper 18 is a U-shaped frame structure, and its top surface abuts and is fixed to the bottom surface of the upper scraper 17. The middle part of the bottom scraper 21 in the lower scraper 18 is fitted and fixed to the limiting groove 20 provided at the bottom end of the shaft 14. Specifically, the scraper 15 consists of an upper scraper 17 and a lower scraper 18, and the upper scraper 17 is an inverted trapezoidal frame. The frame body is adapted to the conical cylindrical structure of the reactor 11. The upper and lower frames of the inverted frame of the upper scraper 17 are respectively fitted and fixed by through holes 16 provided on the shaft 14. The lower scraper 18 has a U-shaped frame structure. The top section of the U-shaped frame of the lower scraper 18 is fixed to both ends of the bottom surface of the upper scraper 17. The middle part of the bottom scraper 21 of the lower scraper 18 is fitted and fixed in the limiting groove 20 provided at the bottom end of the shaft 14. The rotation of the shaft 14 drives the scraper 15 to rotate, reducing dead corners inside the reactor, reducing scaling, and improving the efficiency of the reactor.

[0034] like Figures 1-4 As shown, in this embodiment, the lower part of the reactor body 11 is provided with an inlet pipe 9 and an outlet pipe 10, respectively. The bottom surface of the reactor body 11 is provided with a fan-shaped perforation (not shown in the figure), which is sealed and connected to the outlet 13. The outlet 13 is connected to the outlet pipe 10. The support cylinder 1 and the reactor 11 are fixed with a gap, and the gap between them forms a sealed heat-insulating cavity 12. The support cylinder 1 is provided with a control box 2, a temperature inlet pipe 7, a temperature outlet pipe 8, and a pressure relief port 6, respectively. The bottom of the support cylinder 1 is provided with support legs 5. Specifically, the bottom of the support cylinder 1 is provided with three support legs 5. A sealed reactor 11 is fitted inside the support cylinder 1. The outer wall of the reactor 11 and the inner wall of the support cylinder 1 form a sealed heat-insulating cavity 12. A control box 2 is installed on the support cylinder 1. The control box 2 is an existing product and is mainly used to control the flow rate, temperature, and motor rotation speed of the mother liquor in the reactor. At the same time, a temperature inlet pipe 7 and a temperature outlet pipe 8 are respectively installed on the support cylinder 1. The temperature inlet pipe 7 and the temperature outlet pipe 8 are respectively connected to the heat-insulating cavity 12. By controlling the flow rate, temperature, and pressure of steam, heat loss is reduced, metal fatigue caused by thermal expansion and contraction of the reactor is reduced, and the service life of the reactor is shortened. The cycle is controlled precisely by the insulation cavity 12 to reduce the heat loss of the reactor and improve economic efficiency. A pressure relief port 6 is also set at the top of the support cylinder 1 for pressure release. A fan-shaped perforation is set through the bottom surface of the reactor body 11. The fan-shaped perforation reduces the blockage of the discharge pipe 10. The fan-shaped perforation seals the connection of the discharge pipe 10. The fan-shaped perforation and the discharge pipe 10 are located below the bottom surface of the reactor body 11. The fan-shaped perforation and the discharge pipe 10 are sealed with the reactor 11 to reduce heat loss, improve temperature difference stability, increase its reuse value as a low-grade heat source, shorten the evaporation time, reduce unit energy consumption, and significantly improve the energy utilization rate and economic benefits of multi-effect evaporation.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A high-concentration nitro mother liquor recovery and energy-saving device, characterized in that, The system includes a support cylinder (1), a support beam (4) on the top surface of the support cylinder (1), a motor (3) on the support beam (4), a shaft (14) connected to the output shaft of the motor (3), the shaft (14) being located in the inner cavity of the reactor (11), and the reactor (11) being fitted into the inner cavity of the support cylinder (1); a scraper (15) is fixedly installed on the shaft (14), and several teeth (19) are provided on the outer side of the scraper (15), which are used to scrape off the scale on the inner wall of the reactor (11).

2. The energy-saving device for high-concentration nitro mother liquor recovery according to claim 1, characterized in that, The scraper (15) also includes an upper scraper (17) and a lower scraper (18). The upper scraper (17) is an inverted trapezoidal frame. The upper and lower middle parts of the upper scraper (17) are fitted and fixed by through holes (16) provided on the shaft (14).

3. The energy-saving device for high-concentration nitro mother liquor recovery according to claim 2, characterized in that, The lower scraper (18) is a U-shaped frame structure. The top surface of the U-shaped frame is abutted and fixed to the bottom surface of the upper scraper (17). The middle part of the bottom scraper (21) in the lower scraper (18) is adapted to be fixed in the limiting groove (20) set at the bottom end of the shaft (14).

4. The energy-saving device for high-concentration nitro mother liquor recovery according to claim 3, characterized in that, The two outer sides of the U-shaped frame of the lower scraper (18) are respectively staggered with several teeth (19), and the bottom surface of the bottom scraper (21) of the lower scraper (18) is evenly provided with several teeth (19), and the teeth (19) are conical.

5. The energy-saving device for high-concentration nitro mother liquor recovery according to claim 1, characterized in that, The inner cavity of the reactor (11) is composed of an upper conical body and a lower cylindrical body, and its scraper (15) is adapted to fit the inner cavity of the reactor (11).

6. The energy-saving device for high-concentration nitro mother liquor recovery according to claim 1, characterized in that, The lower part of the reactor (11) is provided with an inlet pipe (9) and an outlet pipe (10). The bottom surface of the reactor (11) is provided with a fan-shaped perforation. The fan-shaped perforation is sealed and connected to the outlet (13). The outlet (13) is connected to the outlet pipe (10).

7. The energy-saving device for high-concentration nitro mother liquor recovery according to claim 1, characterized in that, The gap between the support cylinder (1) and the reactor (11) is fixed, and the gap between the two forms a sealed heat-insulating cavity (12). The support cylinder (1) is equipped with a control box (2), a temperature inlet pipe (7), a temperature outlet pipe (8), and a pressure relief port (6).

8. The energy-saving device for high-concentration nitro mother liquor recovery according to claim 5, characterized in that, A lower scraper (18) is provided inside the lower cylinder, and teeth (19) are provided on the body of the lower scraper (18).

9. The energy-saving device for high-concentration nitro mother liquor recovery according to claim 1, characterized in that, Supporting cylinder (1) has supporting legs (5) installed at the bottom of the main body.

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