Device for removing harmful substances in sodium hydrosulfide waste liquid

Abstract

The utility model provides a device for removing harmful substances in sodium hydrosulfide waste liquid, and belongs to the technical field of sodium hydrosulfide waste liquid treatment. Comprising a reaction kettle and a stirring shaft rotationally connected into the reaction kettle, a liquid inlet pipe fixedly penetrates through a kettle cover of the reaction kettle, a liquid outlet head is fixed to the bottom of the liquid inlet pipe, a plurality of through holes are formed in the bottom of the liquid outlet head, a connecting column is fixed to the side face of the stirring shaft, and the end of the connecting column is fixedly connected with the inner wall of a circular ring; and the circular ring is positioned below the liquid outlet head. Through the arrangement of the circular ring, the first flow channel and the second flow channel, dilute sulphuric acid is added into the circular ring through the liquid inlet pipe and then discharged from the first flow channel and the second flow channel, and the stirring shaft drives the first flow channel and the second flow channel to continuously rotate in the discharging process, so that the dilute sulphuric acid is dispersed and added, and the dilute sulphuric acid is prevented from being accumulated in the reaction kettle; the mixing time of the dilute sulphuric acid and the sodium hydrosulfide is shortened, so that the reaction rate of the dilute sulphuric acid and the sodium hydrosulfide is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sodium hydrosulfide waste liquid treatment, in particular to a device for removing harmful substances from sodium hydrosulfide waste liquid. Background Art

[0002] Cellophane produces waste gas containing hydrogen sulfide during the production process. When treating the hydrogen sulfide in the waste gas, alkali solution is often used to absorb the hydrogen sulfide gas in the waste gas. After the alkali solution absorbs the hydrogen sulfide gas, a sodium hydrosulfide solution is produced. Since the concentration of hydrogen sulfide in the waste gas is generally low, after absorption with alkali solution, the sodium hydrosulfide concentration in the sodium hydrosulfide solution is low and the sodium sulfide concentration is high. When treating the generated sodium hydrosulfide waste liquid, the sodium hydrosulfide waste liquid in the sodium hydrosulfide storage tank is transported to the reactor, and then dilute sulfuric acid is added to the reactor to react and produce hydrogen sulfide gas. The generated hydrogen sulfide gas enters the sodium hydrosulfide storage tank and reacts with the sodium sulfide therein to produce sodium hydrosulfide, thereby reducing the concentration of sodium sulfide in the sodium hydrosulfide waste liquid, thereby achieving the removal of sodium sulfide-like harmful substances in the sodium hydrosulfide waste liquid.

[0003] After searching, a Chinese patent with authorization announcement number CN209828965U discloses a sodium sulfide treatment device in a sodium hydrosulfide solution, which is used to solve the problem of high sodium sulfide concentration in the existing process. The device comprises a reactor, a stirring assembly arranged in the reactor, a sodium hydrosulfide storage tank containing a sodium hydrosulfide solution, and a delivery pipeline connected between the reactor and the sodium hydrosulfide storage tank. The unstable characteristics of sodium hydrosulfide are utilized to generate hydrogen sulfide gas by reacting with dilute sulfuric acid, and then the hydrogen sulfide gas is reacted with sodium sulfide to generate sodium hydrosulfide, thereby reducing the concentration of sodium sulfide in the sodium hydrosulfide solution. After the reaction, the concentration of sodium sulfide in the sodium hydrosulfide solution is reduced, and the purified sodium hydrosulfide solution can be crystallized, which is simple to process and has little pollution.

[0004] The above patent utilizes dilute sulfuric acid and sodium hydrosulfide waste liquid to mix to form hydrogen sulfide gas, and then the hydrogen sulfide gas enters the sodium hydrosulfide storage tank to react with the sodium sulfide therein to produce sodium hydrosulfide, thereby reducing the concentration of sodium sulfide in the sodium hydrosulfide waste liquid. However, when the dilute sulfuric acid is directly added to the reactor through a pipeline, the dilute sulfuric acid is often in an aggregated state when added to the reactor, and a long stirring time is often required to allow the dilute sulfuric acid to fully contact the sodium hydrosulfide waste liquid, and the reaction rate needs to be improved. Therefore, the present application provides a sodium hydrosulfide waste liquid harmful substance removal device to meet the demand. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a device for removing harmful substances from sodium hydrosulfide waste liquid to solve the technical problem that dilute sulfuric acid is often in an aggregated state when added into a reaction kettle, a long stirring time is often required to make the dilute sulfuric acid and the sodium hydrosulfide waste liquid fully contact, and the reaction rate needs to be improved.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0007] A device for removing harmful substances from sodium hydrosulfide waste liquid comprises a reactor and a stirring shaft rotatably connected in the reactor, a reactor cover of the reactor is fixed with a liquid inlet pipe, a liquid outlet head is fixed at the bottom of the liquid inlet pipe, a plurality of through holes are provided at the bottom of the liquid outlet head, a connecting column is fixed at the side of the stirring shaft, an end of the connecting column is fixedly connected to the inner wall of a circular ring, the circular ring is located below the liquid outlet head and in the reactor body of the reactor, an annular groove is provided on the circular ring, and a plurality of flow channels 1 and a plurality of flow channels 2 are respectively provided at the bottom of the inner wall of the annular groove.

[0008] Preferably, the central axis of the circular ring and the annular groove coincides with the central axis of the stirring shaft.

[0009] Preferably, the inner wall of the second flow channel is in a trumpet shape with an opening facing upward.

[0010] Preferably, the second flow channel is inclined.

[0011] Preferably, a trumpet-shaped gathering head is fixed at the bottom of the circular ring at a position corresponding to the second flow channel.

[0012] Preferably, a guide ring is fixed to the bottom of the inner wall of the annular groove, and the guide ring is provided with notches corresponding to the flow channel 1 and the flow channel 2.

[0013] Preferably, a slope is provided on the top of the guide ring.

[0014] Preferably, the liquid outlet head is arc-shaped, and the center of the liquid outlet head is located on the central axis of the ring.

[0015] Compared with the prior art, the utility model has at least the following beneficial effects:

[0016] In the above scheme, through the arrangement of the ring, flow channel one and flow channel two, dilute sulfuric acid is added into the ring through the liquid inlet pipe, and then discharged from the flow channel one and flow channel two. During the discharge process, the stirring shaft drives the flow channel one and flow channel two to rotate continuously, so as to achieve dispersed addition of the dilute sulfuric acid, prevent the dilute sulfuric acid from being accumulated in the reactor, shorten the mixing time of the dilute sulfuric acid and sodium hydrosulfide, and thus improve the reaction rate of the dilute sulfuric acid and sodium hydrosulfide.

[0017] Through the setting of the guide ring, when the ring rotates, dilute sulfuric acid is added into the ring and guided by the guide ring so that the dilute sulfuric acid flows smoothly to flow channel 1 and flow channel 2, thereby preventing the dilute sulfuric acid from accumulating in the ring and effectively reducing the residual dilute sulfuric acid in the ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the present disclosure and to enable those skilled in the relevant art to make and use the present disclosure.

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

[0020] Figure 2 This is a front cross-sectional view of the stirring shaft of the utility model;

[0021] Figure 3 It is a schematic diagram of a three-dimensional structure of a flow channel of the utility model;

[0022] Figure 4 It is a schematic diagram of the three-dimensional structure of the gathering head of the utility model;

[0023] Figure 5 This is a schematic diagram of the guide ring structure of the utility model;

[0024] Figure 6 It is a schematic diagram of the three-dimensional structure of the liquid outlet head of the utility model.

[0025] [Reference Signs]

[0026] 1. Reactor; 2. Stirring shaft; 3. Circular ring; 4. Annular groove; 5. Flow channel 1; 6. Flow channel 2; 7. Connecting column; 8. Gathering head; 9. Guide ring; 91. Inclined surface; 10. Liquid inlet pipe; 11. Liquid outlet head; 12. Through hole.

[0027] As shown in the figure, in order to clearly implement the structure of the embodiment of the utility model, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the utility model to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments, and the adjustments or modifications made are still included in the scope of the attached claims. DETAILED DESCRIPTION

[0028] The following is a detailed description of a sodium hydrosulfide waste liquid harmful substance removal device provided by the utility model in combination with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments, and are not intended to specifically limit the utility model.

[0029] It should be noted that the references to "one embodiment", "embodiment", "exemplary embodiments", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0030] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0031] like Figure 1-Figure 6 As shown, the embodiment of the utility model provides a device for removing harmful substances from sodium hydrosulfide waste liquid, comprising a reactor 1 and a stirring shaft 2 rotatably connected to the reactor 1, the stirring shaft 2 is driven to rotate by a stirring motor, so that the stirring blades at the bottom of the stirring shaft 2 rotate, so as to achieve stirring and mixing of dilute sulfuric acid and sodium hydrosulfide waste liquid, a reactor cover of the reactor 1 is fixedly penetrated with a liquid inlet pipe 10, a valve can be installed on the liquid inlet pipe 10, the valve is opened to allow dilute sulfuric acid to enter the reactor 1, and the valve is closed to prevent dilute sulfuric acid from entering the reactor 1, and at the same time To ensure that the reactor 1 is in a closed state, a liquid outlet head 11 is fixed to the bottom of the liquid inlet pipe 10, and a plurality of through holes 12 are provided at the bottom of the liquid outlet head 11. A connecting column 7 is fixed to the side of the stirring shaft 2, and the end of the connecting column 7 is fixedly connected to the inner wall of the ring 3. The connecting column 7 is used to connect and fix the ring 3 to the stirring shaft 2. The ring 3 is located below the liquid outlet head 11, and the ring 3 is located in the reactor body of the reactor 1. An annular groove 4 is provided on the ring 3, and a plurality of flow channels 5 and a plurality of flow channels 6 are respectively provided at the bottom of the inner wall of the annular groove 4.

[0032] like Figure 2 As shown, in this embodiment, the central axis of the ring 3 and the annular groove 4 coincides with the central axis of the stirring shaft 2, ensuring that during the rotation of the ring 3, all positions of the ring 3 pass under the liquid outlet head 11.

[0033] like Figure 2 As shown, in this embodiment, the inner wall of the flow channel 2 6 is in a trumpet shape with an opening facing upward, which has the effect of gathering the dilute sulfuric acid flowing therethrough and increasing the flow rate.

[0034] like Figure 2As shown, in this embodiment, the flow channel 2 6 is inclined, which increases the distance between the dilute sulfuric acid flowing out of the flow channel 2 6 and the dilute sulfuric acid flowing out of the flow channel 1 5, thereby improving the dispersion of the dilute sulfuric acid.

[0035] like Figure 4 As shown, in this embodiment, a trumpet-shaped gathering head 8 is fixed at the bottom of the ring 3 corresponding to the position of the flow channel 2 6. The trumpet-shaped gathering head 8 is used to increase the flow rate of the dilute sulfuric acid flowing through the inside thereof, so that the dilute sulfuric acid flowing out of the flow channel 2 6 flows to the middle of the reactor 1, further improving the dispersion degree of the dilute sulfuric acid.

[0036] like Figure 3 As shown, in this embodiment, a guide ring 9 is fixed to the bottom of the inner wall of the annular groove 4, and the guide ring 9 is provided with notches corresponding to the flow channel 1 5 and the flow channel 2 6. The guide ring 9 is used to guide the dilute sulfuric acid so that the dilute sulfuric acid can flow smoothly to the flow channel 1 5 and the flow channel 2 6, thereby preventing the dilute sulfuric acid from accumulating in the ring 3 and effectively reducing the residual dilute sulfuric acid in the ring 3.

[0037] like Figure 5 As shown, in this embodiment, a slope 91 is provided on the top of the guide ring 9 , and the dilute sulfuric acid flows onto the guide ring 9 and automatically gathers toward the flow channel 1 5 and the flow channel 2 6 under the guidance of the slope 91 .

[0038] like Figure 6 As shown, in this embodiment, the liquid outlet head 11 is arc-shaped, and the center of the liquid outlet head 11 is located on the central axis of the ring 3. The flowing dilute sulfuric acid is dispersed by the arc-shaped liquid outlet head 11, so that the dilute sulfuric acid is dispersed and flows into the ring 3.

[0039] Working principle: sodium hydrosulfide waste liquid in the sodium hydrosulfide storage tank is added to the reactor 1, and then dilute sulfuric acid is passed into the liquid inlet pipe 10 and flows to the liquid outlet head 11, and then falls from the through hole 12 and falls into the annular groove 4 of the ring 3, and gathers to the flow channel 1 5 and the flow channel 2 6 under the guidance of the guide ring 9, and then is discharged from the vertical flow channel 1 5 and the inclined flow channel 2 6. During the discharge process, the stirring shaft 2 drives the flow channel 1 5 and the flow channel 2 6 on the ring 3 to rotate continuously, so as to achieve the dispersed addition of dilute sulfuric acid, prevent the dilute sulfuric acid from being added to the reactor 1 in an accumulation state, shorten the mixing time of dilute sulfuric acid and sodium hydrosulfide, and thus improve the reaction rate of dilute sulfuric acid and sodium hydrosulfide;

[0040] After the addition of dilute sulfuric acid is completed, the valve on the liquid inlet pipe 10 can be closed. The dilute sulfuric acid reacts with the sodium hydrosulfide waste liquid to produce hydrogen sulfide gas. The generated hydrogen sulfide gas enters the sodium hydrosulfide storage tank and reacts with the sodium sulfide therein to produce sodium hydrosulfide, thereby reducing the concentration of sodium sulfide in the sodium hydrosulfide waste liquid, thereby achieving the removal of sodium sulfide-like harmful substances in the sodium hydrosulfide waste liquid.

[0041] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, the specific details are described in detail in the above preferred embodiments of the present invention, and those skilled in the art can fully understand the present invention without the description of these details.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A device for removing harmful substances from sodium hydrosulfide waste liquid, comprising a reactor (1) and a stirring shaft (2) rotatably connected to the reactor (1), characterized in that: The reactor cover of the reactor (1) is fixedly provided with a liquid inlet pipe (10) extending therethrough, a liquid outlet head (11) is fixedly provided at the bottom of the liquid inlet pipe (10), a plurality of through holes (12) are provided at the bottom of the liquid outlet head (11), a connecting column (7) is fixedly provided at the side of the stirring shaft (2), an end of the connecting column (7) is fixedly connected to the inner wall of a circular ring (3), the circular ring (3) is located below the liquid outlet head (11), and the circular ring (3) is located in the reactor body of the reactor (1), an annular groove (4) is provided on the circular ring (3), and a plurality of flow channels 1 (5) and a plurality of flow channels 2 (6) are provided at the bottom of the inner wall of the annular groove (4).

2. A sodium hydrosulfide waste liquid harmful substance removal device according to claim 1, characterized in that, The central axis of the circular ring (3) and the annular groove (4) coincides with the central axis of the stirring shaft (2).

3. A sodium hydrosulfide waste liquid harmful substance removal device according to claim 1, characterized in that, The inner wall of the second flow channel (6) is in the shape of a trumpet with its opening upward.

4. A sodium hydrosulfide waste liquid harmful substance removal device according to claim 1, characterized in that, The second flow channel (6) is inclined.

5. A sodium hydrosulfide waste liquid harmful substance removal device according to claim 1, characterized in that, A trumpet-shaped gathering head (8) is fixed at the bottom of the circular ring (3) at a position corresponding to the second flow channel (6).

6. A sodium hydrosulfide waste liquid harmful substance removal device according to claim 1, characterized in that: A guide ring (9) is fixed to the bottom of the inner wall of the annular groove (4), and the guide ring (9) is provided with notches corresponding to flow channel 1 (5) and flow channel 2 (6).

7. A device for removing harmful substances from sodium hydrosulfide waste liquid according to claim 6, characterized in that: The top of the guide ring (9) is provided with an inclined surface (91).

8. A device for removing harmful substances from sodium hydrosulfide waste liquid according to claim 1, characterized in that: The liquid outlet head (11) is arc-shaped, and the center of the liquid outlet head (11) is located on the central axis of the circular ring (3).

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