Treatment device for chemical wastewater

Abstract

The utility model relates to the technical field of wastewater treatment, in particular to a treatment device for chemical wastewater, which comprises a base, a recovery tank is arranged on the inner side of the base, the upper end of the left side of the recovery tank is connected with a process water stripping tower bottom pump through a pipeline, and the lower end of the right side of the recovery tank is communicated with a delivery pump through a pipeline. Under the action of the recovery tank body and the process water stripping tower bottom pump, the treatment device has the advantages of environment-friendly treatment and heat preservation, and solves the problem that due to the fact that melamine and trace ammonia are contained in shutdown waste water of a melamine device, and the possibility of process parameter change exists in the shutdown state, the part of shutdown waste liquid can be recycled and reused. The problems of high ammonia nitrogen content and total nitrogen index, biochemical sludge inactivation caused by entering a sewage treatment device, influence on normal operation of the sewage treatment device, and serious environmental protection accidents caused by excessive sewage discharge in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to wastewater treatment technical field, concretely is a kind of treatment device for chemical wastewater. BACKGROUND

[0002] The fifth generation high-pressure melamine process of Europe technique is the latest generation process, and the wastewater can reach zero discharge requirement in normal operation process. However, when the plant is shut down, the aqueous solution in the melamine device and pipeline needs to be discharged outside the boundary. The aqueous solution in the system is 15wt% ammonia solution, which contains a small amount of melamine and OAT (triamine cyanic acid monoamide and triamine cyanic acid diamide). First, the ammonia in the aqueous solution is stripped by the stripping tower, and then the aqueous solution at the bottom of the stripping tower (ammonia content is 0.2wt%, melamine is 0.82wt%, OAT is 0.32wt%, and water is 98.65wt%) is sent to the decomposer. At 11MPa g, 290℃, OAT and melamine are decomposed into carbon dioxide and ammonia. The gas is discharged from the top of the decomposer, and the liquid at the bottom of the decomposer (ammonia content is 1.05wt%, melamine is 0.01wt%, carbon dioxide is 0.44wt%, and water is 98.5wt%) is flashed in the decomposer outlet liquid flash tank after being cooled to 160℃. The bottom fluid (ammonia content is 0.91wt%, melamine is 0.01wt%, carbon dioxide is 0.17wt%, and water is 98.91wt%) enters the process water stripping tower again to strip ammonia and carbon dioxide from the solution. The melamine content at the bottom of the process water stripping tower is 0.01wt%, the water content is 99.99wt%, and the expected ammonia content is at most 20ppm. The wastewater after shutdown of the melamine device (melamine content is 0.01wt%, water content is 99.99wt%, expected ammonia content is at most 20ppm, and temperature is 73℃) is pumped to the outside of the boundary through the bottom pump of the process water stripping tower.

[0003] Currently, due to the presence of melamine and trace ammonia in the wastewater after shutdown of the melamine device, and the possibility of process parameter changes in the shutdown state, the ammonia nitrogen content and total nitrogen index of this part of the shutdown waste liquid are high, which will cause the biochemical sludge to lose activity and affect the normal operation of the wastewater treatment device. If the wastewater discharge exceeds the standard, it will cause serious environmental accidents. Therefore, we propose a treatment device for chemical wastewater. UTILITY MODEL CONTENT

[0004] The utility model discloses a purpose at providing a kind of for chemical wastewater's treatment device, with the advantages of environmental protection treatment and heat preservation, solve the problem of melamine device shutdown wastewater containing melamine and trace ammonia, and there is the possibility of process parameter change under shutdown state, for this part of shutdown waste liquid, ammonia nitrogen content and total nitrogen index are all high, into sewage treatment device can cause biochemical sludge to lose activity, affect the normal operation of sewage treatment device, if sewage discharge exceeds standard can cause serious environmental protection accident.

[0005] To realize the above-mentioned purpose, the utility model provides the following technical scheme: a kind of for chemical wastewater's treatment device, including base, the inner side of the base is provided with recovery tank body, the upper end of recovery tank body left side is connected with process water stripping tower bottom pump by pipeline, the lower end of recovery tank body right side is communicated with conveying pump by pipeline, the output of conveying pump enters the coal grinding water tank of gasification coal mill by pipeline.

[0006] Preferably, the material of the recovery tank body is carbon steel.

[0007] Preferably, the outer side of the recovery tank body is provided with a thermal insulation layer, and the material of the thermal insulation layer is phenolic foam.

[0008] Preferably, the outer side of the thermal insulation layer is provided with a protective layer, and the material of the protective layer is stainless steel sheet.

[0009] Compared with the prior art, the utility model has the beneficial effects as follows:

[0010] The utility model discloses a process water stripping tower bottom pump setting, can send the large amount of wastewater discharged when melamine shutdown into recovery tank body storage, and then realize the rapid collection of wastewater, then, can be stored wastewater slowly sent to the coal grinding water tank of gasification coal mill by conveying pump, then enter gasification coal grinding section for use, so as to solve the treatment problem of melamine shutdown wastewater, that is, the treatment of this part of shutdown wastewater can be solved, and the purpose of wastewater recycling and saving water resources can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0011] Fig. 1 It is the first visual angle structure schematic drawing of the utility model;

[0012] Fig. 2 It is the thermal insulation layer structure schematic drawing of the utility model.

[0013] In the figure: 1, base;2, recovery tank body;3, process water stripping tower bottom pump;4, conveying pump;5, gasification coal mill;6, thermal insulation layer;7, protective layer. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0015] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0016] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0017] The base 1, the recovery tank 2, the process water stripping tower bottom pump 3, the conveying pump 4, the gasification coal mill 5, the heat preservation layer 6 and the protection layer 7 parts of the present application are all general standard parts or parts known to those skilled in the art, and their structures and principles can be known by technical personnel through technical manuals or through conventional experimental methods.

[0018] Embodiment one

[0019] Please refer to Figs. 1-2 As shown in the drawings, the present application provides a technical scheme: a treatment device for chemical wastewater, comprising a base 1, the inner side of the base 1 is provided with a recovery tank 2, the material of the recovery tank 2 is carbon steel, the upper end of the left side of the recovery tank 2 is connected with a process water stripping tower bottom pump 3 through a pipeline, the lower end of the right side of the recovery tank 2 is communicated with a conveying pump 4 through a pipeline, and the output end of the conveying pump 4 enters the coal grinding water tank of the gasification coal mill 5 through a pipeline.

[0020] The technical scheme: through the setting of the process water stripping tower bottom pump 3, a large amount of waste water discharged during the shutdown of melamine can be sent into the recovery tank 2 for storage, thereby realizing rapid storage of waste water, then the stored waste water can be slowly sent to the coal grinding water tank of the gasification coal mill 5 through the delivery pump 4, and then enters the gasification coal grinding section for use, thereby solving the problem of waste water treatment during the shutdown of melamine, that is, the problem of treatment of the waste water during the shutdown of melamine can be solved, and the purposes of waste water recycling and saving water resources can be achieved.

[0021] It should be noted that the temperature of the gasification coal grinding section is high, and water is needed for cooling, and the melamine in the waste water can be burned in the high-temperature environment with oxygen, and nitrogen, carbon dioxide and water are generated, which are harmless.

[0022] Example two

[0023] Based on example one, the utility model discloses as shown in Figs. 1-2 The outer side of the recovery tank 2 is provided with a heat preservation layer 6, and the material of the heat preservation layer 6 is phenolic foam, the outer side of the heat preservation layer 6 is provided with a protective layer 7, and the material of the protective layer 7 is stainless steel sheet.

[0024] The technical scheme: through the setting of the heat preservation layer 6 and the protective layer 7, the external heat preservation capacity of the recovery tank 2 can be improved, and the comprehensive protection capability of the recovery tank 2 can be achieved.

[0025] It should be noted that the waste water sent into the recovery tank 2 needs to be stored for a period of time before treatment, and the weather in the north is cold, and thus heat preservation and anti-freezing treatment are needed.

[0026] Finally, it should be noted that the above examples are only used to illustrate the technical scheme of the utility model, and are not limited to the protection scope of the utility model, although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical scheme of the utility model can be modified or replaced equivalently without departing from the essence and scope of the technical scheme of the utility model.

Claims

1. A device for the treatment of chemical wastewater comprising a base (1), characterized in that: The inner side of the base (1) is provided with a recovery tank (2), the upper end of the left side of the recovery tank (2) is connected with a process water stripping tower bottom pump (3) through a pipeline, the lower end of the right side of the recovery tank (2) is communicated with a delivery pump (4) through a pipeline, and the output end of the delivery pump (4) enters a coal grinding water tank of a gasification coal mill (5) through a pipeline.

2. The device for treating chemical wastewater according to claim 1, characterized in that: The material of the recovery tank (2) is carbon steel.

3. The device for treating chemical wastewater according to claim 1, characterized in that: The outer side of the recovery tank (2) is provided with a heat preservation layer (6), and the material of the heat preservation layer (6) is phenolic foam.

4. The device for treating chemical wastewater according to claim 3, characterized in that: The outer side of the heat preservation layer (6) is provided with a protective layer (7), and the material of the protective layer (7) is stainless steel sheet.

Images