Wastewater preheater for DMF (Dimethyl Formamide) wastewater treatment

Abstract

The utility model relates to the technical field of wastewater preheating devices, in particular to a wastewater preheater for DMF (Dimethyl Formamide) wastewater treatment, which comprises an outer pipe, an inner pipe structure is arranged in the outer pipe and comprises a water passing pipe, connecting frames fixed to the two ends of the water passing pipe and a groove formed in the outer side of the water passing pipe, the groove is sleeved with a heating pipe, protruding structures are fixed to the outer sides of the connecting frames, the outer sides of the protruding structures are fixedly connected with the inner side wall of the outer pipe, and a heating end is fixed to the outer side of the outer pipe. A plurality of groups of heating pipe structures are welded and fixed in the groove, after one end of each heating pipe is fixedly connected with the heating end, the internal water passing pipe structures can be preheated through the plurality of groups of heating pipes, when wastewater passes, passing liquid can be heated, and the winding type heating pipe structures are adopted, so that the contact area with the water passing pipe can be enlarged; and therefore, the heat exchange efficiency is improved, and the liquid flowing inside is raised to the required temperature within a short time.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater preheating devices, in particular to a wastewater preheater for DMF wastewater treatment. Background Art

[0002] DMF is dimethylformamide, which is not only a widely used chemical raw material, but also a widely used excellent solvent. It can be used for wet spinning of synthetic fibers such as polyacrylonitrile fibers and the synthesis of polyurethanes. Dimethylformamide is not only widely used as a solvent for reactions, but also an important intermediate in organic synthesis. It can be used to produce chlordimeform in the pesticide industry. The leather making method currently used in synthetic leather technology is still mainly "wet" leather making, that is, first dissolving polyurethane in an organic solvent such as N,N-dimethylformamide (DMF), then completely impregnating the base fabric (such as non-woven fabric) with the solution, and finally passing it into a coagulation liquid to precipitate the polyurethane. This process will produce a large amount of DMF wastewater containing polyurethane. Generally speaking, the wastewater is suspended and has low transparency. It presents different colors according to the different toners added in the process. In the pharmaceutical industry, it can be used to synthesize sulfadiazine, doxycycline, cortisone, vitamin B6, iodine, quinidine, pyrantel, N-formyl sarcolytic factor, antitumor amino acid, methoxy mustard, benzyl nitrogen mustard, cyclohexyl nitrosourea, furofluuracil, hemostatic acid, befenmethasone, megestrol, choline, chlorpheniramine, etc. Dimethylformamide has a catalytic effect in hydrogenation, dehydrogenation, dehydration and dehydrohalogenation reactions, which reduces the reaction temperature and improves the purity of the product. In the DMF wastewater distillation recovery process, high molecular materials such as polyurethane exist in the liquid phase, which will seriously reduce the heat transfer efficiency of the DMF wastewater distillation recovery equipment. In addition, polyurethane will also change the boiling temperature of DMF and water, reducing the treatment effect of the DMF wastewater distillation recovery equipment.

[0003] Therefore, when secondary purification is required, the wastewater needs to be preheated. However, most of the existing preheating products are box-type structures when in use, and the passing liquid is heated by the internal heating structure. Therefore, when in use, due to its structure, the liquid fluidity inside the box is poor, which is prone to scale deposition and other phenomena, which will have an impact for a long time. Utility Model Content

[0004] Technical issues solved

[0005] In view of the above-mentioned shortcomings of the prior art, the utility model provides a wastewater preheater for DMF wastewater treatment. Through the inner tube structure, the user can open multiple groups of groove structures on the equidistant spiral of the water pipe, and weld and fix multiple groups of heating tube structures in the grooves. After one end of the heating tube is fixedly connected to the heating end, the internal water pipe structure can be preheated by the multiple groups of heating tubes, and the liquid passing through can be heated when the wastewater passes through. The winding heating tube structure can expand the contact area with the water pipe, thereby expanding the heat exchange efficiency, and raising the internal flowing liquid to the required temperature in a short time. It can effectively solve the problems in the prior art that are limited by its structure, the liquid fluidity inside the box is poor, scale deposition is easy to occur, and it will cause long-term impact.

[0006] Technical Solution

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] The utility model provides a wastewater preheater for DMF wastewater treatment, comprising an outer tube; an inner tube structure is arranged inside the outer tube, the inner tube structure comprises a water passing pipe, a connecting frame fixed at both ends of the water passing pipe and a groove arranged outside the water passing pipe, a heating pipe is sleeved on the outer side of the groove, a convex structure is fixed on the outer side of the connecting frame, and the outer side of the convex structure is fixedly connected to the inner side wall of the outer tube, and a heating end is fixed on the outer side of the outer tube; front and rear flanges of the outer tube are connected and fixed to each other by adopting the structure of the connecting frame inside, so that users can install it on site, and the outer tube structure outside can also prevent heat from diffusing to the outside.

[0009] Furthermore, the groove is a threaded groove body, and the heating tube is a threaded structure, which expands the contact area between the heating tube and the water pipe, thereby accelerating the preheating speed.

[0010] Furthermore, the grooves are arranged in a plurality of groups in an equidistant array on the outside of the water pipe, and the heating tube is welded and fixed in the grooves. The plurality of groove structures facilitate contact welding with the heating tube.

[0011] Furthermore, the inner wall of the water pipe is coated with a corrosion-resistant coating, which can protect the structure of the water pipe, extend the service life of the water pipe, and avoid rust and corrosion;.

[0012] Furthermore, the outer side of the outer tube is provided with a ventilation groove, and the ventilation groove structure protects the outer tube structure to prevent the internal overheated gas from damaging the outer tube; when the wastewater passes through, the passing liquid can be heated, and the use of a winding heating tube structure can expand the contact area with the water pipe, thereby expanding the heat exchange efficiency and raising the internal flowing liquid to the required temperature in a short time.

[0013] Furthermore, the top end of each group of the heating tubes is fixedly connected to the heating end, and one side of the heating end is electrically connected to an external control structure. The user can electrically control the heating end through the external control structure to control the temperature of the heating tube within the required appropriate threshold value; in conjunction with the set inner tube structure, the user can open multiple groups of groove structures in the equidistant spiral of the water pipe, and weld and fix multiple groups of heating tube structures in the grooves. After one end of the heating tube is fixedly connected to the heating end, the internal water pipe structure can be preheated through the multiple groups of heating tubes.

[0014] Beneficial Effects

[0015] Compared with the known public technology, the technical solution provided by the utility model has the following beneficial effects:

[0016] 1. The utility model provides an inner tube structure, so that the user can open multiple groups of groove structures in the equidistant spiral of the water pipe, and weld and fix multiple groups of heating tube structures in the grooves. After one end of the heating tube is fixedly connected to the heating end, the internal water pipe structure can be preheated by the multiple groups of heating tubes, and the liquid passing through can be heated when the waste water passes through. The winding heating tube structure can expand the contact area with the water pipe, thereby expanding the heat exchange efficiency, and raising the internal flowing liquid to the required temperature in a short time.

[0017] 2. In this device, the front and rear flanges of the outer tube are connected and fixed to each other by a connecting frame structure inside, which is convenient for users to install on site, and the external outer tube structure can also prevent heat from diffusing to the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 This is the structural front view of the utility model;

[0021] Figure 3 This is a structural split diagram of the utility model;

[0022] Figure 4 This is a structural disassembly diagram of the inner tube in the utility model.

[0023] The numbers in the figure represent: 1, outer tube; 11, ventilation groove; 2, inner tube structure; 21, connection frame; 22, water pipe; 221, groove; 23, heating tube; 3, heating end. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] The utility model is further described below in conjunction with embodiments.

[0026] Embodiment: A wastewater preheater for DMF wastewater treatment, see attached Figure 1 -Attached Figure 4 , including an outer tube 1; an inner tube structure 2 is arranged inside the outer tube 1, and the inner tube structure 2 includes a water pipe 22, a connecting frame 21 fixed at both ends of the water pipe 22 and a groove 221 arranged on the outside of the water pipe 22, and a heating pipe 23 is sleeved on the outside of the groove 221, a protruding structure is fixed on the outside of the connecting frame 21, and the outer side of the protruding structure is fixedly connected to the inner wall of the outer tube 1, and a heating end 3 is fixed on the outside of the outer tube 1; the outer tube 1 has front and rear flanges, and the internal structure of the connecting frame 21 is used to connect and fix each other, which is convenient for users to install on site, and the external structure of the outer tube 1 can also prevent heat from diffusing to the outside.

[0027] The groove 221 is a threaded groove body, and the heating tube 23 is a threaded structure; the contact area between the heating tube 23 and the water pipe 22 is expanded, thereby accelerating the preheating speed; multiple groups of grooves 221 are arranged in an equidistant array on the outside of the water pipe 22, and the heating tube 23 is welded and fixed in the groove 221; multiple groups of grooves 221 structures are convenient for contact welding with the heating tube 23; the inner wall of the water pipe 22 is coated with a corrosion-resistant coating; the corrosion-resistant coating can protect the structure of the water pipe 22, extend the service life of the water pipe 22, and avoid rust and corrosion; the outer side of the outer tube 1 is provided with a breathable groove 11; the breathable groove 11 structure protects the structure of the outer tube 1 to prevent the internal overheated gas from damaging the outer tube 1; the top of each group of heating tubes 23 is fixedly connected to the heating end 3, and the heating end One side of 3 is electrically connected to the external control structure; the user can electrically control the heating end 3 through the external control structure to control the temperature of the heating tube 23 within the required appropriate threshold; through the set inner tube structure 2, the user can open multiple groups of grooves 221 structures on the equidistant spiral of the water pipe 22, and weld and fix multiple groups of heating tubes 23 structures in the grooves 221. After one end of the heating tube 23 is fixedly connected to the heating end 3, the internal water pipe 22 structure can be preheated by the multiple groups of heating tubes 23, and when the wastewater passes through, the passing liquid can be heated. The winding heating tube 23 structure can expand the contact area with the water pipe 22, thereby expanding the heat exchange efficiency and raising the internal flowing liquid to the required temperature in a short time.

[0028] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein by equivalents. These modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wastewater preheater for DMF wastewater treatment, characterized in that, The invention comprises an outer tube (1); an inner tube structure (2) is arranged inside the outer tube (1); the inner tube structure (2) comprises a water pipe (22), a connection frame (21) fixed at both ends of the water pipe (22), and a groove (221) arranged on the outside of the water pipe (22); a heating pipe (23) is sleeved on the outside of the groove (221); a protruding structure is fixed on the outside of the connection frame (21), and the outside of the protruding structure is fixedly connected to the inner wall of the outer tube (1); and a heating end (3) is fixed on the outside of the outer tube (1).

2. A wastewater preheater for DMF wastewater treatment according to claim 1, characterized in that, The groove (221) is a threaded groove body, and the heating tube (23) is a threaded structure.

3. A wastewater preheater for DMF wastewater treatment according to claim 1, characterized in that, The grooves (221) are arranged in a plurality of groups in an equidistant array on the outside of the water pipe (22), and the heating pipe (23) is welded and fixed in the grooves (221).

4. A wastewater preheater for DMF wastewater treatment according to claim 1, characterized in that, The inner wall of the water pipe (22) is coated with a corrosion-resistant coating.

5. A wastewater preheater for DMF wastewater treatment according to claim 4, characterized in that, The outer sides of the outer tubes (1) are provided with ventilation grooves (11).

6. A wastewater preheater for DMF wastewater treatment according to claim 1, characterized in that, The top end of each group of heating tubes (23) is fixedly connected to the heating end (3), and one side of the heating end (3) is electrically connected to an external control structure.

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