Indigo dispersion promoting assembly for indigo production line

Abstract

The utility model discloses an indigo dispersion promoting assembly for an indigo production line, and mainly relates to indigo production. Comprising an oxidation kettle, a driving mechanism arranged at the top of the oxidation kettle, a stirring mechanism connected with the driving mechanism and a circulating cover arranged at the bottom of the oxidation kettle, the stirring mechanism comprises a stirring tool bit and a stirring shaft, the circulation cover comprises a tool bit cover and a shaft cover, the tool bit cover and the shaft cover respectively surround the stirring tool bit and the stirring shaft of the stirring mechanism and are not in contact with the stirring tool bit and the stirring shaft, and a circulation promoting structure and an adding pipeline are arranged on the circulation cover. The device has the beneficial effects that the device is used for mutual dispersion of indigo and water during production of indigo, long-term single-direction flowing in the oxidation kettle can be changed, the indigo can circulate in the oxidation kettle, the circulation process is more reasonable, negative pressure is formed by utilizing the flow velocity difference, a medium can be added into the oxidation kettle, and the production efficiency is improved. The mutual dispersion process of indigo blue and water is further promoted by adding a medium.

Description

Technical Field

[0001] The invention relates to the field of indigo production, in particular to an indigo dispersion-promoting component for an indigo production line. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] In the indigo production line, the last step is to dry and granulate the indigo slurry. Indigo is insoluble in water, so after the indigo slurry and water are mixed, additives and dispersants need to be added to help mix the indigo and water to finally form a suspension of water and indigo.

[0004] The existing indigo dispersion process uses a high-speed motor to drive the blade to quickly stir the mixture of indigo, water and dispersant in the beating tank, so that the indigo and water form a suspension. In the existing beating process, since the blade has a relatively single rotation speed and direction during the stirring process, the indigo beating and dispersion process takes too long and is inefficient, which affects the subsequent granulation process in the indigo production line.

[0005] The disadvantages of the existing indigo dispersion-promoting device are not only that the pulping and dispersion process takes a long time, but also that once the pulping begins, indigo particles cannot be added during the pulping process, and the ratio of water to indigo inside the pulping tank is crucial. If the ratio is too high, it will affect the size of the finished indigo particles in the subsequent drying and granulation process of the production line, resulting in uneven indigo particles. If the moisture ratio is too high, incomplete drying will occur, resulting in larger indigo particles. If the moisture ratio is too low, over-drying will occur, resulting in smaller indigo particles, which will affect the indigo finished product rate.

[0006] In the indigo production line, the defective indigo particles produced in the subsequent drying and granulation process and the indigo particles treated by exhaust gas recovery can be added back into the pulping kettle for reuse. However, since the density of indigo particles is close to that of water and slightly greater than that of water, most indigo particles are suspended or precipitated at the bottom of the water in small amounts. Therefore, when stirred by the existing indigo dispersion-promoting device, the indigo particles will rotate with the inertia generated by the water driven by the blade, resulting in a long dispersion process and low efficiency. This needs to be improved. Summary of the invention

[0007] The purpose of the present invention is to provide an indigo dispersion promoting component for an indigo production line. The device is used for the mutual dispersion process of indigo and water during indigo production, and can change the long-term single-direction flow inside the oxidation kettle to make it circulate inside the oxidation kettle. The circulation process is more reasonable, and a negative pressure is formed by using the flow rate difference, and then a medium can be added inside the oxidation kettle to further promote the mutual dispersion process of indigo and water. And it can be adjusted and set according to the components mixed with water, so as to further accelerate the circulation rate.

[0008] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0009] An indigo dispersion-promoting assembly for an indigo production line includes an oxidation kettle, a driving mechanism arranged at the top of the oxidation kettle, a stirring mechanism connected to the driving mechanism, and a circulation cover arranged at the bottom of the oxidation kettle; the stirring mechanism includes a stirring blade head and a stirring shaft, the circulation cover includes a blade head cover and a shaft cover, the blade head cover and the shaft cover respectively surround the stirring blade head and the stirring shaft of the stirring mechanism, and neither of them contacts the stirring blade head and the stirring shaft, and the circulation cover is provided with a circulation-promoting structure and an addition pipeline; when the driving mechanism drives the stirring shaft and the stirring blade head to rotate synchronously, the stirring blade head rotates synchronously in the circulation cover, so that the mixed liquid in the oxidation kettle circulates in one direction, and the stirring blade head drives the mixed liquid to rotate and discharge the mixed liquid from the blade head cover through the circulation-promoting structure, thereby generating negative pressure to suck the added medium from the addition pipeline into the oxidation kettle, thereby promoting the dispersion rate between the components of the mixed liquid or adjusting the amount of indigo added. The diameter of the blade head cover is larger than the diameter of the shaft cover.

[0010] The circulation promoting structure includes a plurality of outflow ports and a plurality of inlet ports, and the positions of the plurality of outflow ports are in the same direction as the flow pushing direction of the stirring blade head; the stirring blade head pushes the mixed liquid in the circulation cover to the oxidation kettle from the outflow port, and the mixed liquid in the oxidation kettle enters the circulation cover from the inlet port. The outflow port and the inlet port are tapered holes, and the large diameter end of the tapered hole faces the mixed flow direction in the oxidation kettle.

[0011] Flow pushing direction 1: The flow pushing direction of the stirring blade head is pushed out along the circumference of the oxidation kettle, and the plurality of flow outlet arrays are arranged on the circumference of the blade head cover, and the plurality of inlet arrays are arranged on the circumference of the shaft cover.

[0012] Plug flow direction 2: The plug flow direction of the stirring blade head is pushed out along the bottom of the oxidation kettle, and multiple arrays of flow outlets are arranged at the bottom of the blade head cover, and multiple arrays of inlet ports are arranged on the circumference of the shaft cover.

[0013] Plug flow direction 3: The plug flow direction of the stirring blade head is pushed out along the top of the oxidation kettle, and multiple arrays of flow outlets are arranged at the bottom of the blade head cover, and multiple arrays of inlet ports are arranged on the circumference of the shaft cover.

[0014] The diameter of the pipe opening at the connection between the addition pipeline and the circulation hood is gradually reduced, and the addition medium entering the addition pipeline is one or more of the following components, and the addition medium is air, flue gas, steam, dispersant, and indigo particles.

[0015] A method for using an indigo dispersion promoting component for an indigo production line, comprising: S1, adding indigo and water into an oxidation kettle, and driving a stirring shaft and a stirring blade head through a driving mechanism to stir the mixed liquid in the oxidation kettle;

[0016] S2, the circulation hood changes the circulation mode of the mixture in the oxidation kettle, so that the mixed liquid is centered on the circulation hood and circulates continuously inside and outside the circulation hood with stirring;

[0017] S3, selecting the flow direction of the stirring blade according to the composition of the mixed liquid, so that the flow direction of the stirring blade is more suitable for the position of the indigo in the water;

[0018] S4, using the stirring blade to drive the mixed liquid to rotate and discharge the mixed liquid from the blade cover through the circulation promotion structure, generating negative pressure to suck the added medium from the addition pipeline into the oxidation kettle, so as to further promote dispersion and adjust the amount of indigo added.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] This device is used for the mutual dispersion process of indigo and water during indigo production. It can change the long-term single-direction flow inside the oxidation kettle and make it circulate inside the oxidation kettle. The circulation process is more reasonable. By using the flow rate difference to form a negative pressure, the medium can be added inside the oxidation kettle to further promote the mutual dispersion process of indigo and water. And it can be adjusted according to the components mixed with water to further speed up the circulation rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Attached Figure 1 It is an overall view of the device of the present invention.

[0022] Attached Figure 2 This is a view of the circulation cover in the present invention corresponding to the push flow direction 1.

[0023] Attached Figure 3 This is a view of the liquid flow direction inside the circulation cover corresponding to the push flow direction 1 of the present invention.

[0024] Attached Figure 4 This is a view 2 of the circulation cover corresponding to the flow direction in the present invention.

[0025] Attached Figure 5 This is a view of the liquid flow direction inside the circulation cover corresponding to the push flow direction 2 in the present invention.

[0026] Attached Figure 6This is a view of the circulation cover in the present invention corresponding to the flow direction 3.

[0027] Attached Figure 7 This is a view of the liquid flow direction inside the circulation cover corresponding to the push flow direction 3 in the present invention.

[0028] Numbers shown in the accompanying drawings:

[0029] 1. Driving mechanism; 2. Circulation cover; 3. Stirring blade; 4. Stirring shaft; 5. Blade cover; 6. Shaft cover; 7. Adding pipeline; 8. Outlet; 9. Inlet. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the application equally.

[0031] The present invention discloses an indigo dispersion promoting component for an indigo production line, as shown in the accompanying drawings of the specification. Figure 1 As shown, it includes an oxidation kettle, a driving mechanism 1 arranged on the top of the oxidation kettle, a stirring mechanism connected to the driving mechanism 1, and a circulation hood 2 arranged at the bottom of the oxidation kettle; the driving mechanism 1 is a high-speed motor, and the stirring mechanism includes a stirring blade 3 and a stirring shaft 4. The stirring shaft 4 is driven by the high-speed motor to rotate synchronously, so that the stirring blade 3 stirs the mixed liquid (indigo slurry / particles mixed with water) in the oxidation kettle. The existing oxidation kettle stirring method to promote the dispersion of the mixed liquid is analyzed: First, due to the long-term and single-direction stirring of the mixed liquid by the stirring blade 3, the mixed liquid will rotate in the oxidation kettle due to inertia. After a long time, a steady state is generated, resulting in a weak actual dispersion effect. Therefore, in order to make the mixed liquid blend or disperse better, it is necessary to break the steady state caused by the long-term rotation of the stirring blade 3 in the oxidation kettle, so as to promote the dispersion between indigo and water as soon as possible. The following improvements are made to this end: +, the circulation cover 2 includes a blade cover 5 and a shaft cover 6, the blade cover 5 and the shaft cover 6 respectively surround the stirring blade 3 and the stirring shaft 4 of the stirring mechanism, and both of them are not in contact with the stirring blade 3 and the stirring shaft 4, and the circulation cover 2 is equivalent to surrounding the stirring blade 3 as a whole.

[0032] First, the circulation mode of the mixed liquid in the oxidation kettle is changed, and the circulation cover 2 is further improved: as shown in the attached figure of the specification Figure 2 and Figure 3As shown, a circulation-promoting structure is provided on the circulation hood 2, by which the circulation mode of the mixed liquid in the oxidation kettle is made more reasonable. The circulation-promoting structure includes a plurality of outflow ports 8 and a plurality of inlet ports 9, and the positions of the plurality of outflow ports 8 are the same as the flow pushing direction of the stirring blade head 3; the flow direction is: the stirring blade head 3 pushes the mixed liquid in the circulation hood 2 into the oxidation kettle through the outflow port 8, and the mixed liquid in the oxidation kettle enters into the circulation hood 2 through the inlet port 9, so that the mixed liquid is centered on the circulation hood 2 and circulates continuously inside and outside the circulation hood 2 with stirring.

[0033] In order to speed up the flow rate of the mixed liquid in the circulation hood 2, the outflow port 8 and the inlet port 9 are improved from the original circular holes to conical holes, and the large diameter end of the conical hole faces the flow direction of the mixture in the oxidation kettle, so that when the mixed liquid in the circulation hood 2 flows out, it flows from the large-aperture conical hole surface to the small-aperture conical hole surface. Due to the smaller diameter, the outflow speed is accelerated, which further promotes dispersion. Similarly, when the mixed liquid in the oxidation kettle flows into the circulation hood 2, it also flows from the large-aperture conical hole surface to the small-aperture conical hole surface. Due to the smaller diameter, the speed of flowing into the circulation hood 2 is accelerated, thereby accelerating the exchange rate of solutions inside and outside the circulation hood 2.

[0034] Secondly, the thrust direction of the stirring blade 3 is determined according to the composition of the mixed liquid.

[0035] As for the composition of the mixed liquid, it is mainly a mixture of indigo slurry and water, or indigo particles that can be reused in the indigo production line. The difference between the two is: the density of indigo particles is close to that of water, and the mass is lighter. After entering the water, they will be suspended in the water; as for indigo slurry, the density is greater than water and the mass is larger, so after entering the water, it will sink to the bottom of the oxidation kettle. Therefore, the properties of indigo particles and indigo slurry are different, and corresponding designs are required. It should be noted that here we only discuss which scheme is more suitable for the mixing of indigo particles or indigo slurry with water according to the direction of plug flow, not that the scheme described below is incompatible with the two. The following is a specific scheme:

[0036] Push flow direction 1:

[0037] As shown in the attached figure of the instruction manual Figure 2 and Figure 3 As shown, the flow direction of the stirring blade 3 is pushed out along the circumference of the oxidation kettle, and multiple outflow ports 8 are arranged in an array on the circumference of the blade cover 5, and multiple inlet ports 9 are arranged in an array on the circumference of the shaft cover 6, so that the mixed liquid in the circulation cover 2 is pushed out radially along the circumference of the oxidation kettle, and then the indigo particles and water suspended in the oxidation kettle enter the circulation cover 2 together through the inlet port 9. Due to the position of the inlet port 9, this solution is more suitable for indigo particles. This type of blade is a turbine blade.

[0038] Push flow direction 2:

[0039] As shown in the attached figure of the instruction manual Figure 4 and Figure 5 As shown, the flow direction of the stirring blade head 3 is pushed out along the bottom of the oxidation kettle, and a plurality of the outflow ports 8 are arranged in an array at the bottom of the blade head cover 5, and a plurality of the inlet ports 9 are arranged in an array around the shaft cover 6, so that the mixed liquid in the circulation cover 2 is directly pushed to the bottom of the oxidation kettle, and the water flow directly stirs up the indigo slurry at the bottom of the oxidation kettle, which will promote the dispersion of the indigo slurry in the oxidation kettle, and then enter the circulation cover 2 for continuous circulation, thereby promoting the dispersion effect, so this solution is more suitable for indigo slurry. This type of blade head is a propeller-type propulsion blade head.

[0040] Push flow direction 3:

[0041] As shown in the attached figure of the instruction manual Figure 6 and Figure 7 As shown, the flow direction of the stirring blade head 3 is pushed out along the top of the oxidation kettle, and a plurality of flow outlets 8 are arranged in an array at the bottom of the blade cover 5, and a plurality of inlet ports 9 are arranged in an array on the circumference of the shaft cover 6. This scheme is similar to the flow direction 2. Here, the stirring blade head 3 is also a propeller-type propulsion blade head. By changing the rotation direction of the driving mechanism 1, the flow direction of the stirring blade head 3 is changed from pushing downward to pushing upward. Correspondingly, the circulation cover 2 in the oxidation kettle needs to be inverted as a whole, so that after the stirring blade head 3 pushes out the mixed liquid in the circulation cover 2, the indigo slurry at the bottom of the oxidation kettle enters the inside of the guide cover through the inlet port 9, so that the indigo slurry circulates rapidly in the oxidation kettle, so this scheme is more suitable for indigo slurry.

[0042] Finally, other factors are added to increase the dispersion rate between the components of the mixed liquid in the oxidation reactor.

[0043] Regarding the influence of the circulation hood 2 on the dispersion of the components of the mixed liquid, there is another factor that can increase the dispersion effect. The diameter of the blade cover 5 of the circulation hood 2 is larger than the diameter of the shaft cover 6. Through improvement, after the stirring blade 3 pushes the mixed liquid out, a pressure difference is formed between the inside of the blade cover 5 and the solution in the oxidation kettle, so that the solution in the oxidation kettle enters the circulation hood 2 more quickly. Based on this, the push-out rate and the entry rate can be controlled to form a negative pressure inside the circulation hood 2.

[0044] A corresponding addition pipeline 7 is provided, and the addition pipeline 7 is connected to the outside air. After negative pressure is formed in the circulation hood 2, both the air and the mixed liquid will enter the circulation hood 2, so that when the mixed liquid in the oxidation kettle is dispersed, bubbles are introduced into the water. These bubbles play a role of aeration during the rising and flowing process, further promoting the contact between the mixed liquid and the air, so that the dispersion rate between the mixed liquids is increased.

[0045] As for the setting position of the addition pipeline 7, both the plug flow direction 1 and the plug flow direction 2 are set at the top of the shaft cover 6 and connected to the top of the oxidation kettle. As for the plug flow direction 3, due to the position of the circulation cover 2, the addition pipeline 7 is connected to the side of the shaft cover 6. In order to increase the rate of air entering the circulation cover 2, the corresponding diameter of the pipe opening at the connection between the addition pipeline 7 and the circulation cover 2 is gradually reduced.

[0046] The medium added by the adding pipeline 7 may be flue gas and steam in addition to air. Flue gas and steam are used in many places in the indigo production line. For example, steam is used in triple-effect evaporation, and flue gas is used in indigo granulation and alkali solution condensation processes. Therefore, it is convenient to use the above-mentioned medium in the indigo production line. In addition, flue gas and steam can not only add gas to the oxidation kettle, but also heat the mixed liquid in the oxidation kettle, thereby further accelerating the dispersion rate of indigo and water.

[0047] Air / flue gas / steam can also be used as a conveying medium to add indigo particles to the oxidation kettle. There are two main reasons: 1. After the indigo particles are added to the water, they are in a suspended state. It is better to use the addition pipeline 7 to directly participate in the internal circulation of the oxidation kettle to indirectly improve the dispersion effect. 2. The original production line can only add indigo particles once, and the proportion is difficult to control. If the proportion is too high, it will affect the size of the finished indigo particles in the subsequent drying and granulation process of the production line, resulting in uneven indigo particles. If the water ratio is too high, it will not be completely dry, and then produce indigo particles with larger particle sizes; if the water ratio is too low, it will be over-dried, and produce indigo particles with smaller particle sizes, which will affect the yield of indigo. Therefore, a detection port can be set for the oxidation kettle. If the proportion of indigo particles is too small after uniform dispersion, indigo particles can be added to the oxidation kettle through the addition pipeline 7, so as to control the ratio of water and indigo particles in the oxidation kettle. Similarly, air / flue gas / steam can be used as a conveying medium to add a dispersant to the oxidation kettle. In the original production line, the dispersant is added once and then circulated with the indigo slurry and water in the oxidation kettle. If too little dispersant is added, the dispersion of indigo and water will be greatly affected. The dispersant can be gradually added to the oxidation kettle through the adding pipeline 7, thereby controlling the dispersion effect of water and indigo particles in the oxidation kettle.

[0048] Detailed instructions for use:

[0049] S1, after adding indigo and water into the oxidation kettle, the driving mechanism 1 drives the stirring shaft 4 and the stirring blade head 3 to stir the mixed liquid in the oxidation kettle; S2, the circulation cover 2 changes the circulation mode of the mixture in the oxidation kettle, so that the mixed liquid is centered on the circulation cover 2 and circulates continuously inside and outside the circulation cover 2 with stirring; S3, the flow direction of the stirring blade head 3 is selected according to the composition of the mixed liquid, so that the flow direction of the stirring blade head 3 is more suitable for the position of indigo in the water; S4, the stirring blade head 3 is used to drive the mixed liquid to rotate and discharge the mixed liquid from the blade head cover 5 through the circulation promotion structure, generating negative pressure to suck the added medium from the addition pipeline 7 into the oxidation kettle, so as to further promote dispersion and adjust the amount of indigo added.

[0050] The above method has been discussed in the previous article, so it will not be repeated again. In summary, the device is used for the mutual dispersion process of indigo and water during indigo production, which can change the long-term single-direction flow inside the oxidation kettle, so that it circulates inside the oxidation kettle, and the circulation process is more reasonable. By using the flow rate difference to form a negative pressure, the medium can be added inside the oxidation kettle, and the mutual dispersion process of indigo and water can be further promoted by adding the medium. And it can be adjusted according to the components mixed with water, so as to further speed up the circulation rate.

Claims

1. An indigo dispersion promoting component for an indigo production line, characterized by: It comprises an oxidation kettle, a driving mechanism (1) arranged on the top of the oxidation kettle, a stirring mechanism connected to the driving mechanism (1), and a circulation cover (2) arranged on the bottom of the oxidation kettle; The stirring mechanism comprises a stirring blade (3) and a stirring shaft (4); the circulation cover (2) comprises a blade cover (5) and a shaft cover (6); the blade cover (5) and the shaft cover (6) respectively surround the stirring blade (3) and the stirring shaft (4) of the stirring mechanism, and neither of the blade cover (5) and the shaft cover (6) is in contact with the stirring blade (3) and the stirring shaft (4); the circulation cover (2) is provided with a circulation promoting structure and an addition pipeline (7); When the driving mechanism (1) drives the stirring shaft (4) and the stirring blade head (3) to rotate synchronously, the stirring blade head (3) rotates synchronously in the circulation cover (2), so that the mixed liquid in the oxidation kettle circulates around the circulation cover, and the stirring blade head (3) drives the mixed liquid to rotate and discharges the mixed liquid from the blade head cover (5) through the circulation promotion structure, thereby generating negative pressure to suck the added medium from the addition pipeline (7) into the oxidation kettle, thereby promoting the dispersion rate between the components of the mixed liquid or adjusting the amount of indigo added.

2. The indigo dispersion promoting component for an indigo production line according to claim 1, characterized in that: The circulation promoting structure comprises a plurality of outflow ports (8) and a plurality of inlet ports (9), and the positions of the plurality of outflow ports (8) are in the same direction as the flow pushing direction of the stirring blade head (3); The stirring blade head (3) pushes the mixed liquid in the circulation cover (2) from the outflow port (8) to the oxidation kettle, and the mixed liquid in the oxidation kettle enters the interior of the circulation cover (2) from the inlet port (9).

3. The indigo dispersion promoting component for an indigo production line according to claim 2, characterized in that: The pushing direction of the stirring blade head (3) is pushed out along the circumference of the oxidation kettle, a plurality of the flow outlets (8) are arranged in an array on the circumference of the blade head cover (5), and a plurality of the inlet ports (9) are arranged in an array on the circumference of the shaft cover (6).

4. The indigo dispersion promoting component for an indigo production line according to claim 2, characterized in that: The pushing direction of the stirring blade head (3) is pushed out along the bottom of the oxidation kettle, a plurality of the flow outlets (8) are arranged in an array at the bottom of the blade head cover (5), and a plurality of the inlet ports (9) are arranged in an array on the circumference of the shaft cover (6).

5. The indigo dispersion promoting component for an indigo production line according to claim 2, characterized in that: The pushing direction of the stirring blade head (3) is pushed out along the top of the oxidation kettle, a plurality of the flow outlets (8) are arranged in an array at the bottom of the blade head cover (5), and a plurality of the inlet ports (9) are arranged in an array on the circumference of the shaft cover (6).

6. The indigo dispersion promoting component for an indigo production line according to any one of claims 2 to 5, characterized in that: The outflow port (8) and the inlet port (9) are tapered holes, and the large diameter end of the tapered hole faces the flow direction of the mixture in the oxidation kettle.

7. The indigo dispersion promoting component for an indigo production line according to claim 1, characterized in that: The diameter of the pipe opening at the connection between the addition pipeline (7) and the circulation cover (2) is gradually reduced, and the addition medium entering the addition pipeline (7) is one or more of the following components, and the addition medium is air, flue gas, steam, dispersant, and indigo particles.

8. The indigo dispersion promoting component for an indigo production line according to claim 1, characterized in that: The diameter of the cutter head cover (5) is greater than the diameter of the shaft cover (6).

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