A fluid injecting arrangement and a method thereof

Abstract

A fluid injecting arrangement (100) for introducing fluid into a viscous mixture flow in a pipeline (102) comprising a fluid feeding pipe (104), a nozzle (106, 502) being connected with the fluid feeding pipe (104) and arranged in an opening of the wall (503) of the pipeline (102) for forming a junction point (108), and pressure means for providing pressure to the arrangement (100), wherein the pressure means are arranged to provide and maintain a desired pressure difference at said junction point (108).

Description

[0001] A FLUID INJECTING ARRANGEMENT AND A METHOD THEREOF

[0002] FIELD OF THE INVENTION

[0003] Generally, the present invention relates to a fluid injecting arrangement and a method thereof. In particular, the present invention pertains to a fluid injecting arrangement for a viscous mixture flow and a method for injecting the fluid into the viscous mixture flow.

[0004] BACKGROUND

[0005] A viscous mixture, also known as sludge or slurry, is a semi-solid material made of denser solids suspended in a liquid, commonly water, originating from various industrial processes such as water and wastewater treatment. It serves primarily to transport solids or separate minerals, with particle sizes ranging from 1 micrometer to several millimeters.

[0006] Examples of viscous mixtures span across multiple industries, including cement slurry in the petroleum sector; soil / cement slurry or Controlled Low-Strength Material (CLSM) in construction; gel explosives; lahar from volcanic eruptions; bentonite mixtures for slurry walls; coal slurry in energy production; and slip in ceramics. Other notable examples include slurry oil in oil refining; a combination of wood pulp and water in paper industry; manure slurry in agriculture; meat slurry in food processing; abrasives for chemical-mechanical polishing; slurry ice for cooling systems; mixtures in cement manufacturing; and epoxy glue mixtures for aerospace engineering, for example. These diverse examples highlight the versatility and importance of viscous materials in various sectors, from construction and energy to agriculture and food production.

[0007] For various reasons it may be necessary to distribute a fluid to the viscous mixture, which flows in a pipeline. Fluid can be air or steam to heat the viscose mixture or liquid, for example. For viscous mixtures with a high viscosity (high-viscosity mixture), where the dry matter content exceeds 5%, fluid integration is typically achieved by combining the fluid with a small portion of the separated viscous mixture using a high-power mixer and reintroducing this blend into the main flow through a direct pipe connection (Fig. 1). However, a significant drawback of this method is that the injected fluid tends to remain adjacent to the pipe walls, failing to adequately mix with the high-viscosity mixture.

[0008] Conversely, when the dry matter content in the viscous mixture is below 5%, different diffusers can be used to inject fluid into a viscous mixture flow. One solution is disclosed in Fig. 2, presenting Solaris Hydroheater©. These diffusers typically have a centrally positioned nozzle within the pipeline, which enhances fluid dispersion by injecting fluid directly into the flow of the viscous mixture. However, this solution has its own set of challenges, including potential blockages of the pipeline and mechanical wear on the diffuser, which can affect system efficiency and durability.

[0009] In addition, solutions comprising a nozzle inside the pipeline are not suitable for liquid chemicals or cooling water as injectors, since those fluids won’t disperse to the viscous mixture flow from the nozzle.

[0010] Therefore, there remains a significant need to enhance the injection of fluid into a viscous mixture flow.

[0011] SUMMARY OF THE INVENTION

[0012] The objective is to at least alleviate the problems described herein above not satisfactorily solved by the known arrangements, and to provide a feasible fluid injecting arrangement for efficiently mixing fluid into viscous mixture without blocking a pipeline.

[0013] The aforesaid objective is achieved by the embodiments of an arrangement in accordance with the present invention.

[0014] The aforesaid objectives are achieved according to the present invention as claimed in claim 1.

[0015] Accordingly, in one aspect of the present invention, the fluid injecting arrangement for introducing fluid into a viscous mixture flow in a pipeline comprises a fluid feeding pipe, a nozzle being connected with the fluid feeding pipe and arranged in an opening of the wall of the pipeline for forming a junction point, and pressure means for providing pressure to the arrangement, wherein the pressure means are arranged to provide and maintain a desired pressure difference at said junction point. The viscosity of the viscous mixture and the composition of the fluid affect the pressure difference at the junction point. The pressure means can be used to adjust the pressure difference as desired and thus achieve effective mixing of the fluid with the viscous mixture flow.

[0016] In one embodiment, the nozzle comprises means for adjusting the size of a number of openings of the nozzle. By adjusting the size of the nozzle opening, the volume of fluid flow can be adjusted, and the size of the opening is also affected by the composition of the fluid being fed.

[0017] In one embodiment, the arrangement further comprises sensor means for detecting the pressure difference at the junction point.

[0018] In one embodiment, the desired pressure difference at the junction point is substantially from 1 bar to 40 bar.

[0019] The claimed pressure difference of 1 to 40 bar is preferable to optimize fluid penetration, since higher pressure difference causes a better penetration of the fluid into the viscous mixture. However, increasing the pressure difference beyond this range, especially above 40 bar, could introduce complications, likely due to the limits of the materials and equipment used in the manufacturing process. High pressures might necessitate more robust and therefore more expensive or complex manufacturing techniques and materials to withstand the stress, potentially making the process less feasible economically or technologically.

[0020] In one embodiment, the fluid feeding pipe is arranged at an angle to the pipeline, which angle deviates from the right angle. The angle may improve the fluid distribution in the viscous mixture flow.

[0021] In another aspect of the present invention, a method for distributing fluid into a viscous mixture flow in a pipeline comprises at least the steps of

[0022] - connecting the nozzle in an opening of the wall of a pipeline,

[0023] - providing a desired pressure difference at the junction point, and

[0024] - injecting the fluid in the fluid feeding pipe to the nozzle.

[0025] In one embodiment, the method further comprises a step of adjusting the size of a number of openings of the nozzle. The utility of the present invention follows from a plurality of factors depending on each particular embodiment. The arrangement according to the present invention may achieve high distribution of fluid into a viscous mass flow by maintaining a consistent pressure differential at the junction point, which allows an increased flow aperture without compromising the quality of dispersion.

[0026] In the current invention, the design ensures that only the nozzle is in contact with the viscous mixture flow, potentially reducing the risk of pipeline blockages and nozzle wear. The absence of elements within the design that could potentially cause main pipeline blockages may ensure an uninterrupted flow. This continuity can significantly cut down on both downtime and maintenance, enhancing operational reliability. Moreover, the system's built-in resistance to mechanical wear, which is a frequent challenge with mass flow, may prolong its operational lifespan and minimize the need for repairs, thereby maintaining long-term efficiency.

[0027] The present invention enables direct injection of both gases and liquids into the viscous mixture flow in the pipeline, catering to a diverse array of viscous mixture flows including chips, pulp, and water, for example.

[0028] The present invention may be able to completely eliminate mass pockets within the pipeline flow, which traditionally lead to quality inconsistencies due to the formation of mass pockets at T-junctions.

[0029] Furthermore, the system could act as an inline valve in T-junctions, which would be particularly beneficial in setups involving pulp discharge valves, for example. This feature could enhance system control and reduce the likelihood of operational disruptions.

[0030] The angle of the fluid feeding pipe may enhance the distribution and mixing power of the arrangement, which may significantly improve the distribution of fluid into the viscous mixture flow.

[0031] Further, the present invention may facilitate the safe introduction of pre-heating steam into chip flows for cookers and the secure injection of cooking chemicals, for example. This could allow for more versatile and efficient processing, even enabling the effective introduction of alternative chemicals. Finally, the versatility of this invention, being installable in any position relative to the main pipeline flow, whether in a co-current or counter-current direction, could enhance its adaptability to various operational scenarios.

[0032] The expression “a number of’ refers herein to any positive integer starting from one (1), e.g. to one, two, or three.

[0033] The expression “a plurality of’ refers herein to any positive integer starting from two (2), e.g. to two, three, or four.

[0034] Different embodiments of the present invention are disclosed in the dependent claims.

[0035] BRIEF DESCRIPTION OF THE RELATED DRAWINGS

[0036] Next the invention is described in more detail with reference to the appended drawings in which

[0037] Fig. 1 illustrates a prior art solution for a high-viscous mixture flow,

[0038] Fig. 2 illustrates another prior art solution presenting a diffuser having centrally positioned nozzle within a pipeline,

[0039] Fig. 3 illustrates a cross-section of an embodiment of a fluid injecting arrangement in accordance with the present invention,

[0040] Fig. 4 illustrates a cross-section of another embodiment of a fluid injecting arrangement in accordance with the present invention,

[0041] Fig. 5a illustrates a cross-section of an embodiment of a nozzle having a conical outlet,

[0042] Fig. 5b illustrates a cross-section of a variation of the nozzle shown in Fig. 5a broader dispersion,

[0043] Fig. 5c illustrates a cross-section of an embodiment of a nozzle with an annular outlet geometry, and

[0044] Fig. 5d illustrates a cross-section of a variation of the nozzle shown in Fig. 5c with a larger overall outlet size. Fig. 6 is a flow diagram of an embodiment of a method for distributing fluid into a viscous mixture flow in a pipeline in accordance with the present invention.

[0045] DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] Fig. 3 illustrates a cross-section of an embodiment of a fluid injecting arrangement in accordance with the present invention. The fluid injecting arrangement 100 for introducing fluid into a viscous mixture flow in a pipeline 102 comprises a fluid feeding pipe 104, a nozzle 106 being connected with the fluid feeding pipe 104 and arranged in an opening of the wall of the pipeline 102 for forming a junction point 108, and pressure means (not shown) for providing pressure to the arrangement.

[0047] A viscous mixture flow in the pipeline 102 can be any type of viscous mixture being high-viscosity mixture or less viscous mixture as described above. Arrows 110 are showing the directions of the viscous mixture flow in the pipeline. The arrangement of the present invention can be installed in any position relative to the main pipeline flow. Therefore, the viscous mixture flow can be in either direction in the pipeline 102.

[0048] The direction of the fluid flow is denoted with an arrow 112. Fluid can be in a form of steam, gas and / or liquid depending on the purpose. Fluid is injected to the viscous mixture from the nozzle 106 and the junction point 108 of the present invention is the point, where the fluid exits the nozzle 106 and enters into the pipeline 102.

[0049] In an embodiment, the fluid feeding pipe 104 is arranged at an angle to the pipeline 102, which angle deviates from the right angle. The preferable angle is between 25° - 65°. The direction of the viscous mixture flow does not affect the angle, but it can be in either direction.

[0050] In an embodiment, the nozzle 106 comprises means for adjusting the size of a number of openings of the nozzle 106 for controlling the volume of the fluid passing through it. The opening adjusting means can be arranged in various ways. In an embodiment, the nozzle 106 comprises a number of apertures, whose diameters are adjustable.

[0051] In other embodiment, the nozzle 106 is designed with a conical shape This cone- shaped part fits into an opening, and by moving the nozzle up or down (raising or lowering), it regulates the flow of fluid. When the nozzle is lowered, it fits more snugly into the opening, reducing or blocking the flow. Raising the nozzle allows more space between the cone and the opening, letting the fluid flow through more freely.

[0052] The pressure means of the present invention are arranged to provide and maintain a desired pressure difference at the junction point. The skilled person will understand that the pressure means can be arranged in various ways, such as, but not limited to, centrifugal or piston pumps, and / or pressure regulators, for example.

[0053] The pressure difference is arranged in such way that the pressure of the fluid is higher than the pressure in the pipeline. Therefore, the fluid is enabled to disperse into the viscous mixture flow efficiently even if the viscous mixture flow has very high viscosity. In an embodiment, the pressure difference is preferably substantially between 1 bar - 40 bar, more preferably 2.5 bar - 40 bar.

[0054] In one embodiment, the arrangement 100 further comprises sensor means (not shown) for detecting the pressure difference at the junction point 108. The skilled person will understand that the sensor means for detecting the pressure difference at the junction point can be arranged in various ways, such as, but not limited to, flow control valves, pressure relief valves, pressure differential valves, and / or pressure sensors with automation systems, for example.

[0055] Fig. 4 illustrates a cross-section of another embodiment of a fluid injecting arrangement in accordance with the present invention. In this embodiment, the arrangement 100 is connected with the pipeline 102 at an angle divergent from the perpendicular. This angular connection does not impact the dispersion of the fluid. Unlike the conical nozzle shown in Fig. 3, the nozzle 106 in this embodiment has a different shape. The skilled person will understand that the nozzle's design can be optimized based on the properties of the fluid being injected and the characteristics of the viscous mixture.

[0056] In Figs. 5a-5d are shown embodiments of exemplary nozzle variations designed to illustrate alternative outlet geometries and adjustable configurations for directing fluid into a viscous mixture flow. Each embodiment demonstrates a different configuration suitable for specific mixing conditions, flow profiles, or pipeline dimensions. In all cases, the nozzle 502 is mounted on the wall 503 of the pipeline and directs fluid into the interior of the pipe toward the viscous mixture flow. Fig. 5a shows a nozzle 502 with a conical outlet 504. The direction of fluid injection through the outlet 504 depends on the installation angle of the nozzle 502, which may vary as described previously. The size of the outlet 504 is controlled by an internal conical control element 508, which is axially movable within the nozzle body (as indicated by the arrow in the shaft).

[0057] Fig. 5b shows a variation of the nozzle of Fig. 5a, wherein the geometry of the outlet 504 and control element 508 enables broader dispersion. In both Figs. 5a and 5b, the position of the control element 508 can be adjusted vertically — raised to increase the outlet opening or lowered to restrict it. This adjustment allows precise regulation of the fluid flow rate into the pipeline without compromising penetration. The mechanism may be implemented, for example, by a threaded connection or actuator system.

[0058] Fig. 5c illustrates another embodiment of a nozzle 502 with an annular outlet geometry, shown in cross-section. The nozzle 502 is installed in the wall 503 of the pipeline. The direction of fluid injection depends on the installation angle of the nozzle 502, which may vary as described previously. Although only two outlet paths 510a and 510b are visible in the cross-sectional view, the nozzle 502 extends circumferentially around the pipeline axis, resulting in a circular injection pattern. This geometry enables uniform dispersion of fluid into the main flow from all directions within a single plane. The nozzle 502 comprises an internal control element 508, which is axially movable to adjust the outlet flow area, as indicated by the arrow in the shaft.

[0059] Fig. 5d shows a variation of the nozzle of Fig. 5c with a larger overall outlet size 510. The nozzle 502 retains the same circular, radially-outward injection configuration within the pipeline wall 503, but the outlet structure is expanded in diameter and flow area. The direction of fluid injection remains dependent on the installation angle. This design is suited for conditions requiring increased fluid throughput while maintaining even radial distribution and efficient mixing performance.

[0060] Fig. 6 is a flow diagram of an embodiment of a method for distributing fluid into a viscous mixture flow in a pipeline in accordance with the present invention.

[0061] At step 602, the nozzle is connected an opening of the wall of a pipeline. As described above, the arrangement can be installed in any position relative to the main pipeline flow, whether in a co-current or counter-current direction. Further, the arrangement does not have to be installed perpendicular with the pipeline.

[0062] At 604, a desired pressure difference is provided at said junction point.

[0063] At 606, the fluid is injected in the fluid feeding pipe to the nozzle.

[0064] In one embodiment, the method further comprises a step of adjusting the size of a number of openings of the nozzle.

[0065] The fluid injecting arrangement is designed to deliver fluid at a single, targeted point within the process pipeline. The combination of the primary flow’s high mass flow rate and the directed injection of fluid promotes localized turbulence, which significantly enhances the mixing efficiency. The high mass flow of the injected fluid contributes to deeper penetration into the main viscous mixture flow, even in cases where the mixture contains a substantial amount of solid matter.

[0066] The arrangement allows flexible positioning in the pipeline. Due to the compact and modular design, the injection unit can be installed at an optimal location, angle, and depth within the process system. By adjusting the nozzle’s installation angle and insertion depth, the flow dynamics can be fine-tuned to achieve effective dispersion without introducing pressure losses in the main flow.

[0067] In certain embodiments, the nozzle includes a terminal component located inside the pipeline that is shaped to increase local turbulence around the injection point. This feature can further support the mixing of the injected fluid with the viscous medium.

[0068] The system also allows for the adjustment of the nozzle orifice size. With a constant pressure differential maintained across the injection point, varying the orifice size provides precise control over the flow rate of the injected fluid. This ensures stable penetration into the main flow while allowing flexible dosing, independent of changes in process pressure.

[0069] Consequently, a skilled person may on the basis of this disclosure and general knowledge apply the provided teachings in order to implement the scope of the present invention as defined by the appended claims in each particular use case with necessary modifications, deletions, and additions.

Claims

CLAIMS1. A fluid injecting arrangement for distributing fluid into a viscous mixture flow in a pipeline characterized in that, said arrangement comprises- a fluid feeding pipe,- a nozzle being connected with said fluid feeding pipe and arranged in an opening of the wall of the pipeline for forming a junction point, and- pressure means for providing pressure to said arrangement, wherein said pressure means are arranged to provide and maintain a desired pressure difference at said junction point.

2. A fluid injecting arrangement according to claim 1, wherein said nozzle comprises means for adjusting the size of a number of openings of said nozzle for controlling the volume of the fluid passing therethrough.

3. A fluid injecting arrangement according to any preceding claim, wherein said arrangement further comprises sensor means for detecting the pressure difference at said junction point.

4. A fluid injecting arrangement according to any preceding claim, wherein said desired pressure difference at said junction point is substantially between 1 bar - 40 bar.

5. A fluid injecting arrangement according to any preceding claim, wherein said fluid feeding pipe is arranged is arranged at an angle to the pipeline, which angle deviates from the right angle.

6. A method for distributing fluid into a viscous mixture flow in a pipeline, comprising a fluid injecting arrangement according to any of claims 1-5, comprising at least the steps of- connecting said nozzle in an opening of the wall of a pipeline,- providing a desired pressure difference at said junction point,- injecting the fluid in said fluid feeding pipe to said nozzle.

7. A method of claim 6, wherein the method further comprises a step of adjusting the size of a number of openings of said nozzle.

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