Stock solution premixing device and reaction kettle
By configuring specific parameters and arranging the structure of multiple feed pipes, combined with a spiral flow guide device, the problem of uneven fluid mixing in traditional mixing methods is solved, achieving efficient and stable fluid mixing.
Patent Information
- Application Number
- CN202423200608.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2034-12-23
AI Technical Summary
Traditional mixing methods cannot precisely control the pressure, velocity, and height distribution of multiple fluids, resulting in uneven mixing and unstable mass transfer efficiency, which affects product quality and production efficiency.
By configuring specific parameters and arranging the structure of multiple independent feed pipes, a systematic relationship is formed between the pressure, Bernoulli height, pipe diameter, inclination angle, fluid density, and flow velocity of each pipe, thereby achieving orderly fluid injection from top to bottom. Combined with a spiral guide device, this promotes rotational mixing.
It achieves uniform mixing and efficient mass transfer of multiple fluids, avoiding problems such as uneven mixing and backflow, and improving mixing efficiency and product quality.
Smart Images
Figure CN223683350U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of chemical process engineering, and particularly relates to a device for pre-premixing of multiple fluid streams under specific pressure, flow rate and density relationships. BACKGROUND
[0002] In the fields of chemical industry, pharmaceutical industry, environmental governance and the like, multiple fluid streams need to be pre-mixed under specific pressure, flow rate and density relationships. Traditional mixing methods often lack precise control over the pressure, flow rate and height distribution of each pipeline, resulting in uneven mixing and unstable mass transfer efficiency of the fluid when entering the downstream processing unit, thereby affecting product quality and production efficiency. Therefore, for the pre-mixing process of multiple pipelines connected in series, it is necessary to design specific parameters and arrange structures so that the pressure gradient, density and flow rate distribution of each fluid stream are orderly formed when entering the pre-mixer, and the height and pipe diameter are reasonably configured, so as to obtain uniform mixing effect. SUMMARY
[0003] The purpose of the present application is to provide a pre-mixing device, which is configured by specific parameters and arranged by structures for multiple independent inlet pipelines, so as to form a systematic relationship between the pressure, Bernoulli height, pipe diameter, inclination angle, fluid density and flow rate of each pipeline, thereby realizing orderly fluid injection from top to bottom in the multi-stage series connection process, and finally obtaining an optimized pre-mixing effect.
[0004] The pre-mixing device of the present application comprises N pipelines, N being a natural number greater than 2, each pipeline having an independent inlet and being numbered as t1, t2, t3,..., tN in sequence. The layout of the pipelines is designed so that the outlet of the pipeline t2 is connected to the flow channel of the pipeline t1, the outlet of the pipeline t3 is connected to the flow channel of the pipeline t2, and so on, until the outlet of the pipeline tN is connected to the flow channel of the pipeline tN minus one, thereby forming a multi-stage series connection structure in space.
[0005] To achieve the expected pressure distribution, the Bernoulli parameter of each pipeline is set in the present application. By adjusting the height, diameter, flow distribution and fluid characteristic parameters of the pipeline, the pressure at the confluence point of each pipeline presents an increasing relationship from small to large, i.e. p1 < p2 < p3 < … < pN. Specifically, by gradually reducing the Bernoulli height of the pipeline, h1 > h2 > h3 > … > hN is obtained; by setting the diameter of each pipeline, d1 > d2 > d3 > … > dN is obtained; by selecting suitable fluid and pipeline matching relationship, the pipeline transmitting the fluid with higher density in the upstream is obtained, i.e. ρ1 > ρ2 > … > ρN; at the same time, the flow rate of each pipeline is optimized and configured, so that V1 > V2 > … > VN is obtained. Through the gradual change relationship of the height, diameter, density and flow rate, combined with the conditional constraint of the Bernoulli equation, the orderly increase of the pressure from the upstream to the downstream can be realized, so as to ensure the smooth confluence of multiple fluids.
[0006] In the exemplary arrangement in which N is 3, the pipelines t1 and t2 extend at an inclination angle in the range of 30° to 90°, and the pipeline t3 is arranged in a vertical direction. In this way, the outlets of the pipelines are sequentially intersected in space, from t1 at the top to t2 in the middle and t3 at the bottom, and the fluid is introduced step by step.
[0007] In addition, a spray head is provided at the end of the pipeline t1, and a spiral flow guide device is arranged in the spray head. Thus, the mixed fluid generates a rotating flow in the spray head. When the fluid is sprayed out, the rotating motion makes the fluid effectively mixed and uniformly dispersed.
[0008] Through the above technical solution, the premixing device provided by the present application utilizes N pipelines arranged from high to low in height, distributed from large to small in diameter, matched from high to low in density and set from high to low in flow rate, and realizes the pressure distribution in an increasing trend from the upstream to the downstream through the limiting relationship of the Bernoulli equation, i.e. p1 < p2 < p3 < … < pN. This pressure gradient from small to large ensures that each fluid can be smoothly confluenced in turn, avoiding the problems of backflow or uneven mixing, so as to realize an efficient and stable premixing process. BRIEF DESCRIPTION OF DRAWINGS
[0009] Figure 1 is the overall structure schematic diagram of the premixing device embodiment one of the present application.
[0010] Figure 2 is the overall structure schematic diagram of the premixing device embodiment two of the present application.
[0011] Figure 3 is the cross-sectional structure schematic diagram of the premixing device embodiment two of the present application. DETAILED DESCRIPTION
[0012] The pre-mixing device of the present application is described in detail below in combination with the drawings, and its structural features and working principles are explained.
[0013] Embodiment one
[0014] Figure 1 The overall structure of a pre-mixing device is shown. The device comprises N separate feeding pipes, numbered t1, t2, t3, to tN, where N is a natural number greater than 2.
[0015] The discharge port of pipe t2 merges into the flow channel of pipe t1, the discharge port of pipe t3 merges into the flow channel of pipe t2, and so on, until the discharge port of pipe tN merges into the flow channel of pipe t(N-1), forming a multi-stage series merging structure.
[0016] The Bernoulli parameters of the pipes t1, t2, t3, to tN are set so that the pressure at the merging point of each pipe satisfies p1
[0017] The merging point is the position where two pipes meet (indicated by the arrows in pipes t2 to tN). Figure 1
[0018] In the present application, the Bernoulli parameters of each pipe include pressure p, flow velocity V, fluid density p, height h, and pipe diameter d. These parameters together determine the energy distribution and flow characteristics of the fluid in the pipe.
[0019] To achieve the pressure increasing relationship p1
[0020] According to the Bernoulli equation, the pressure term can be explicitly expressed as:
[0021] Where p is the static pressure of the fluid, p is the fluid density, V is the flow velocity, g is the acceleration of gravity, and h is the height of the position where the fluid is located. In the present application, the merging point of the pipes is taken as the characteristic position for discussion.
[0022] As can be seen from the above relationship, under the condition that the density, flow velocity, and height are determined, the pressure depends on the distribution of these parameters. When N pipes are connected in series and finally merged, the present application achieves the pressure relationship p1
[0023] According to the Bernoulli equation, when other conditions are the same, the higher the position h, the smaller the value of p.
[0024] Therefore, in order to realize that the pressure of the upstream pipeline is greater than the pressure of the downstream pipeline, the application sets h1>h2
[0025] h3>…>hN, the installation positions of the pipelines are arranged from high to low. The potential energy term at the downstream pipeline is larger, resulting in a relatively low static pressure p; and the upstream pipeline position is lower, the potential energy term is reduced, and under the same energy distribution, it is more beneficial to obtain a higher p value.
[0026] In order to realize h1>h2>h3>…>hN, the height differences of the confluence points are respectively m1>m2>m3>…>mn, and the Bernoulli height satisfies the relationship:
[0027] h1>h2>h1-m2, h1-m1>h3>h1-(m1+m2), h1-(m1+m2)>h4>h1-(m1+m2+m3)…
[0028]
[0029] Among them, the heights h1, h2, h3…hN refer to the vertical height from the inlet of each pipeline to the confluence point between the upstream and downstream pipelines.
[0030] Further, in order to realize that the pressure of the upstream pipeline is greater than the pressure of the downstream pipeline, the application sets the diameters d1 to dN of the N pipelines to satisfy d1<d2<d3<…<dN.
[0031] The relationship between the flow rate V and the flow Q is:
[0032] According to the Bernoulli equation, the pressure term can be explicitly expressed as:
[0033] In the application, the newly added parameter Q represents the flow Q, which represents the volume of fluid flowing through the pipeline per unit time; d represents the inner diameter of the pipeline.
[0034] The pressure p is proportional to the diameter of the pipeline, and since d1<d2<d3<…<dN (that is, the diameter of the downstream pipeline is larger, and the upstream pipeline gradually decreases), the above formula is obtained p1<p2<p3<…<pN.
[0035] Further, according to the Bernoulli formula, the density of the fluid flowing in the pipeline t1 to the pipeline tN can also be configured to satisfy ρ1>ρ2>…>ρN, so that the confluence point pressure satisfies p1<p2<p3<…<pN.
[0036] Further, according to Bernoulli formula, the speed of the fluid flowing in the pipes t1 to tN can also be configured to satisfy V1>V2>…>VN, so that the pressure at the merging point satisfies p1<p2<p3<…<pN.
[0037] The above Bernoulli parameters can be set to satisfy multiple parameters at the same time, for example, 2 or more conditions of h1>h2>h3>…>hN, d1<d2<d3<...<dN, ρ1>ρ2>…>ρN, V1>V2>…>VN are satisfied at the same time.
[0038] Through the setting of the Bernoulli parameters of the above pipes, the fluid enters the premixing area at a reasonable pressure at the merging point, enhancing the uniformity of mixing.
[0039] Embodiment two
[0040] Referring to Figure 2 and Figure 3 the structure diagram of the premixing device. The device includes three fluid pipes, respectively marked as first pipe t1, second pipe t2 and third pipe t3. Each pipe has an independent inlet, and the surface of the inlet includes a threaded connection device 201, 202, 203 for connecting the raw material pump.
[0041] The mixing device 200 body 204 is a left-right symmetrical structure, the first pipe inlet 211 is located on the left side of the device, used for sending the first fluid into the mixing device body 204. The second pipe inlet 212 is located on the right side of the device, used for sending the second fluid into the mixing device body. The third pipe inlet 213 is located in the middle of the device, used for sending the third fluid into the mixing device body.
[0042] The fluid in the pipe t2 merges into the pipe t1, and the fluid in the pipe t3 merges into the pipe t2. The pressure P1 of the pipe t1, the pressure of the pipe t2, and the pressure of the pipe t3 at the merging point satisfy the relationship p1<p2<p3.
[0043] The pipe t1 extends at a predetermined range of inclination angle, the pipe t2 extends at the same range of inclination angle, and the pipe t3 extends along the vertical direction. The outlets of the pipes are sequentially intersected in space, so that multiple streams of fluid are injected in order from high to low. The range of inclination angle is greater than 30° and less than 90°.
[0044] The pipes t1 and t2 are substantially symmetrical structures, the Bernoulli height h1 of the pipe t1 is less than the Bernoulli height h2 of the pipe t2, so that the pressure p1 of the pipe t1 is less than the pressure p2 of the pipe t2. The Bernoulli height h3 of the pipe t3 is greater than the Bernoulli height h2 of the pipe t2, in order to avoid the fluid in the pipe t2 flowing back into the pipe t3, the speed V3 of the pipe t3 needs to be set.
[0045] The calculation process of the speed V3: the Bernoulli equation of the pipes t2 and t3 is respectively:
[0046]
[0047] Where P2 and P3 are the pressures at the intersection points of the pipes t2 and t3 respectively, ρ is the fluid density, V2 and V3 are the flow rates of the pipes t2 and t3, h2 and h3 are the heights of the pipes t2 and t3.
[0048]
[0049] To ensure P3>P2, it is required that:
[0050]
[0051] Simplifying it gets:
[0052]
[0053] That is:
[0054]
[0055] Therefore, configuring the flow rate of V3 according to the above formula can make P3>p2, and the fluid in the pipe t3 can be smoothly mixed into the pipe t2.
[0056] The end of the pipe t1 connected to the spray head 205 after the mixing of the fluid in the pipe t3, the spray head 205 includes a spiral flow guide device, the spiral flow guide device has a spiral inner flow channel structure. The spiral structure can change the flow direction of the fluid, make the fluid produce rotation and vortex, increase the interaction between the fluids. In addition, the design of the spiral shape makes the fluid produce rotary motion when passing through, further increases the shear force and turbulent effect of the fluid, which helps the uniform mixing of different fluids. By enhancing the rotational flow, the spiral structure can effectively promote the mixing of the fluid, especially in applications that require efficient mixing of different fluid components, avoiding fluid stratification or unevenness, and improving the mixing efficiency.
[0057] Example three
[0058] The application also provides a reaction kettle body, which is made of corrosion-resistant and high-temperature-resistant materials (such as stainless steel, alloy steel or ceramic materials) and can work stably under high temperature, high pressure and complex chemical reaction conditions. The reaction kettle is connected with the mixing device, so that the multiple fluid raw materials can be fully premixed before entering the reaction kettle. The internal control system can monitor the temperature, pressure, flow rate and liquid level and other parameters in the reaction process in real time, and automatically adjust the flow rate, temperature and stirring speed of each input fluid according to the setting, so as to optimize the reaction conditions and ensure the efficient and stable reaction process. Optionally, the reaction kettle also includes a discharge port, an exhaust port and a gas purification device, which can ensure the smooth discharge of the reaction product and the effective treatment of the exhaust gas, and has a multi-stage safety protection design, such as overpressure protection, overtemperature protection and liquid level monitoring, to ensure the safe and stable operation of the equipment. The reaction kettle is suitable for chemical synthesis, drug production, wastewater treatment and other fields,
[0059] In summary, the Bernoulli parameters (such as pressure, flow rate, density, pipe diameter, inclination angle and height) of the multiple pipes are accurately configured, so that the fluid can form an orderly pressure gradient, flow rate and density distribution when entering the premixing device, thereby realizing efficient and stable mixing of the fluid. Especially in the structure of multiple pipes in series, the step-by-step merging of the fluid in each pipe avoids the problem of uneven mixing.
[0060] The application ensures that the pressure increases from upstream to downstream (p1 < p2 < p3 <... < pN) by setting the pressure, flow rate and density relationship of each pipe. At the same time, reasonable pipe diameter and flow rate configuration ensure that each fluid maintains high transmission efficiency and uniformity when merging.
[0061] The spiral flow guide device arranged at the end of the pipe further improves the mixing effect. The spiral-shaped inner flow channel structure can change the flow direction of the fluid, make it produce rotation and vortex, enhance the shear force and turbulent effect of the fluid, thereby promoting the uniform mixing and atomization of different fluid components, and improving the dispersibility and mass transfer efficiency of the fluid.
Claims
1. A pre-mixing device, characterized in that, The pre-mixing device comprises: pipes t1, t2, t3 to tN, each of which has an independent inlet, N being a natural number greater than 2; the outlet of the pipe t2 merges into the upstream of the outlet of the pipe t1, the outlet of the pipe t3 merges into the upstream of the outlet of the pipe t2, and so on until the outlet of the pipe tN merges into the upstream of the outlet of the pipe tN-1, thereby forming a multi-stage series merging structure; Bernoulli parameters of the pipes t1, t2, t3 to tN are set so that the pressure corresponding to each pipe merging point satisfies p1 < p2 < p3 < … < pN.
2. The pre-mixing device of claim 1, wherein Bernoulli heights h1 to hN of the N pipes satisfy h1 > h2 > h3 > … > h(N-1) > hN.
3. The pre-mixing device of claim 2, wherein Diameters d1 to dN of the N pipes satisfy d1 < d2 < d3 < … < dN.
4. A pre-mixing device according to claim 2 or 3, characterized in that The N is equal to 3, the pipe t1 and the pipe t2 extend at a predetermined oblique angle, and the pipe t3 extends along a vertical direction.
5. The pre-mixing device of claim 4, wherein The predetermined oblique angle ranges from greater than 30° to less than 90°.
6. The pre-mixing device of claim 5, wherein The end of the pipe t1 is connected with a spray head, and the spray head comprises a spiral flow guide device.
7. The pre-mixing device of claim 6, wherein Densities ρ1 to ρN of the fluids transported by the N pipes satisfy ρ1 > ρ2 > … > ρN.
8. The pre-mixing device of claim 3 or 7, wherein Flow rates V1 to Vn of the fluids transported by the N pipes satisfy V1 > V2 > … > VN.
9. The pre-mixing device of claim 6, wherein When the mixed fluid passes through the inner flow channel of the spiral flow guide device, a rotating flow is generated inside the spray head.
10. A reaction vessel, characterized by, The use of the pre-mixing device according to claim 1 mixes N input fluid raw materials, N being a natural number greater than 2.