A dosing pipeline mixer for sludge drying treatment

Abstract

The present invention belongs to the field of sludge drying treatment, and discloses a dosing pipeline mixer for sludge drying treatment, which is arranged on a sludge conveying pipeline of a sludge drying treatment process, and includes at least two connecting parts connected to each other and forming a continuous channel inside, and an extrusion expansion part arranged between adjacent connecting parts; the channel cross section of the extrusion expansion part determines two mutually perpendicular axes with a center point, starting from the channel cross section where an opening on one side of the extrusion expansion part is located, one of the axes is first extended and then shortened, and the other axis is first shortened and then extended; and the difference in the channel cross-sectional area of ​​the entire extrusion expansion part is less than 20%. The device of the present invention can achieve a better mixing effect of sludge and chemicals at a lower operation and maintenance cost.

Description

Technical Field

[0001] The invention belongs to the technical field of sludge drying, and in particular relates to a dosing pipeline mixer for sludge drying treatment. Background Art

[0002] Sludge drying, also known as sludge dehydration, refers to the process of removing most of the water content from sludge through filtration or evaporation, generally referring to the use of self-evaporation facilities such as sludge drying fields (beds). After the sludge is concentrated, physical methods are used to further reduce the water content of the sludge to facilitate the transportation, accumulation, utilization or further treatment of the sludge. There are two types of dehydration (drying): natural evaporation and mechanical dehydration. It is customary to call mechanical dehydration sludge dehydration and natural evaporation sludge drying. Although the methods are different, they are all measures to further reduce the water content of sludge.

[0003] The sludge discharged from urban sewage treatment plants has a moisture content of about 80% after gravity concentration and mechanical dehydration. It is large in size and has a low calorific value. It is not suitable for aerobic composting, incineration, building material utilization, or even landfill. It must be further dehydrated and dried. After the sludge is concentrated, physical methods are used to further reduce the moisture content of the sludge to facilitate the transportation, accumulation, utilization or further treatment of the sludge. There are two types of dehydration (drying): natural evaporation and mechanical dehydration. It is customary to call mechanical dehydration sludge dehydration and natural evaporation sludge drying. Although the methods are different, they are all measures to further reduce the moisture content of the sludge.

[0004] Most of the existing technologies use a variety of equipment combined with drying treatment methods. Since most sludge treatment plants accept all the sludge to be treated near their locations, the moisture content of the sludge to be treated is different. During treatment, different sludges will be stored separately according to the moisture content range, and then the sludge in the high moisture content range will be treated first by pretreatment, and after reducing the moisture content to a certain extent, it will be input into the steam drying treatment equipment together with other sludges with low moisture content (relative concept, all higher than the standard value) for drying treatment. However, it was found in the actual treatment process that the sludge with a higher moisture content not only has a higher operating pressure of the equipment due to its high viscosity during transportation, but also has a higher power loss of the sludge in the pipeline. In addition, due to the use of spiral conveying equipment and a long stroke, the sludge is easy to expand rapidly during transportation and squeeze the equipment or fall directly from the open equipment. Not only will it cause equipment damage, but it will also cause secondary pollution, which will bring unnecessary troubles to the sludge drying process. In order to solve the above problems, it is necessary to add reagents to the sludge before transportation. By mixing the reagents, the expansion rate can be reduced, thereby avoiding excessive expansion during transportation to affect the transmission efficiency. The key point of the above solution lies in the degree of mixing of the reagent and the sludge. If the distribution rate is low, local expansion problems may still occur. If large-scale mixing equipment is used, not only will the energy consumption be high, but it will also affect the treatment efficiency. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention provides a pipeline mixer used in the sludge drying process, which can use a non-powered pipeline structure to efficiently mix the sludge and the reagent, and achieve a better mixing effect with a lower operating cost while minimizing the impact on the sludge flow rate.

[0006] The technical solution adopted by the present invention is:

[0007] In a first aspect, the present invention discloses a dosing pipeline mixer for sludge drying treatment, which is arranged on a sludge conveying pipeline of a sludge drying treatment process, and comprises at least two connecting parts connected to each other and forming a continuous channel inside, and an extrusion expansion part arranged between adjacent connecting parts;

[0008] The channel cross section of the extrusion expansion part defines two mutually perpendicular axes with the center point, starting from the channel cross section where the opening on one side of the extrusion expansion part is located, the length of one axis is first extended and then shortened, and the length of the other axis is first shortened and then extended;

[0009] And the difference in the channel cross-sectional area of ​​the entire extrusion expansion portion is less than 20%.

[0010] A pipeline mixer is a commonly used reagent mixing device, which is intended to passively stir and mix the flowing material therein, so that the reagent added at one end or in other equipment can be better dispersed into the flowing material. The flowing material in the present invention is sludge, and the water content is higher than 60%, which is an untreated state. At this time, the added reagent is in liquid state. Most pipeline mixers in the prior art adopt a rotary vane structure, which is suitable for low-viscosity materials. Sludge is a thick material with high flow resistance, so the head loss is high when passing through the pipeline.

[0011] The present invention achieves different uniform distribution effects by providing an extrusion expansion structure. Since the rotary blade needs to turn the sludge, its mechanical energy will inevitably be greatly reduced. The present invention can squeeze and disperse the sludge by changing the cross-sectional shape, and can restore the original cross-sectional state after being squeezed and dispersed, thereby achieving a certain mixing effect. The reagent filling position and the appropriate position of the extrusion expansion part make the reagent more evenly distributed in the sludge.

[0012] It is worth noting that the conventional pipe cross section is circular, while the present invention establishes a coordinate system with the center of the pipe cross section as the origin, and defines it with two perpendicular diameters as axes. The so-called expansion extrusion is achieved by lengthening the length of one axis and reducing the length of the other axis at the same time, thereby achieving a gradual change effect on the inner wall. The gradual change starts from an opening on one side, and the entire cross section gradually changes from a circle to an elliptical shape, and the length of one axis is continuously reduced, so that the cross section presents a longer length and a smaller width. The sludge is squeezed by the inner walls on both sides so that the sludge can be diffused when passing through the cross section, so that each section under a unit length has a smaller amount of sludge, so that the dosing equipment can be used to apply the agent to it, which not only avoids the certain operating costs and material use costs caused by stirring and turning, but also enables the agent to be evenly distributed in the sludge when the kinetic energy of the original sludge changes less, further solving related sludge expansion and other problems.

[0013] It is also worth noting that, since the sludge is acted on by squeezing the inner wall, the head loss is smaller than that caused by stirring or rotating blades. At the same time, in order to further reduce the kinetic energy loss, the difference in cross-sectional area change is limited to no more than 20%. In the prior art, there is a pipeline mixer with multiple expansion chambers for treating sludge. This pipeline structure with multiple expansion chambers is obviously not conducive to the mixing of the reagents due to the enlarged pipe diameter. If an active stirring mechanism is added separately, its cost will increase, and the stirring direction and stirring time will cause mutual constraints on the flow rate and the distribution of the reagents. Reducing the pipe diameter can reduce the area of ​​​​drug distribution, thereby improving the uniformity of the distribution of the reagent, but it will affect its flow rate. Only by controlling the cross-sectional area and reducing the cross-sectional area change rate can the flow rate loss be effectively reduced (based on the present invention, the extrusion effect of the sludge is achieved through the smooth change of the inner wall. If other guiding or cutting structures are directly set in the pipeline, such as other similar rotating blades, it may not have the same effect).

[0014] In combination with the first aspect, the present invention provides a first implementation of the first aspect, wherein a drug outlet is provided in the extrusion expansion portion, and the drug outlet is arranged at a length change turning point in the middle of the two axes.

[0015] The so-called length change turning point refers to the turning point where the axis first becomes longer and then shortens. This is the minimum width position mentioned above. At this time, the sludge has a larger length and a smaller width when passing through this section, and the sludge volume per unit length is the smallest. By setting multiple drug outlets along the length direction here, uniform distribution can be achieved under a smaller drug injection water pressure state without turning the sludge.

[0016] In combination with the first embodiment of the first aspect, the present invention provides a second embodiment of the first aspect, wherein a drug distributor is provided on the outside of the extrusion expansion portion, the drug distributor is arranged along the length direction at the minimum cross-sectional width, and is connected to an external drug adding device through a drug adding tube.

[0017] In combination with the first embodiment of the first aspect, the present invention provides a third embodiment of the first aspect, wherein a reinforcing edge strip is provided at the outwardly protruding edge of the extruded expansion portion.

[0018] The so-called outward protruding edge means that due to the structural design of "flattening" the entire pipe, the two ends of one axis will expand outward and exceed the original cross-sectional diameter, and the outer side of the entire extruded expansion part will form an arc-shaped edge protruding outward. Since the sludge is then squeezed by the inner wall in the direction perpendicular to the axis, it has extrusion pressure on both sides. In order to increase the structural strength, a metal reinforced edging structure is set on the protruding arcs on both sides.

[0019] In combination with the second embodiment of the first aspect, the present invention provides a fourth embodiment of the first aspect, wherein a groove along the axial direction is provided at the length change turning point in the middle of the two shafts in the extrusion expansion portion, and a cutter head along the axial direction is formed by at least two grooves.

[0020] It is worth noting that, when observing from the opening on one side of the extrusion expansion part, it can be seen that the inner walls on both sides in the same axial direction will produce inward extrusion deformation, resulting in a reduction in the cross-sectional width. A ridge will be formed at the place with the lowest width, and the two sides of the ridge are smoothly transitioned curved surfaces, and the sludge will form the smallest cross-sectional width at this place. At this time, by setting multiple blade structures on the ridge, a tangential force on the sludge can be formed, so that the sludge passing through the blade is divided, effectively increasing the stirring effect of the sludge.

[0021] In combination with the fourth implementation of the first aspect, the present invention provides a fifth implementation of the first aspect, wherein the medicine outlet is arranged on both sides of the cutter head.

[0022] In combination with the fifth embodiment of the first aspect, the present invention provides a sixth embodiment of the first aspect, wherein the medicine dispensing device has a medicine dispensing cavity, the medicine dispensing cavity has an end extending to the inside of the blade head, and the end is connected to the medicine outlet.

[0023] In combination with the first aspect and the first to sixth embodiments thereof, the present invention provides a seventh embodiment of the first aspect, comprising at least two interconnected extrusion expansion parts, and a relative deflection angle between adjacent extrusion expansion parts is 90°.

[0024] The so-called relative deflection angle refers to the calculation of the deviation angle by placing the different axes of the two openings on the same horizontal plane with the two axes of different squeezing expansion parts as reference. By setting at least two squeezing expansion parts with a deflection angle of 90°, the passing sludge can be continuously squeezed in two vertical directions, thereby further increasing the mixing effect.

[0025] In combination with the first aspect and the first to sixth embodiments thereof, the present invention provides an eighth embodiment of the first aspect, comprising at least three interconnected extrusion expansion parts, and the relative deflection angle between adjacent extrusion expansion parts is 60°.

[0026] It is worth mentioning that the pipeline mixer of the present invention is intended to fully mix the reagent and the sludge. The prior art stirs by rotating and flipping, but the extrusion expansion part of the present invention does not adopt the rotating stirring method, but achieves a better mixing effect through the extrusion effect in different directions combined with the setting of the dosing port at the narrowest point, thereby reducing the kinetic energy loss.

[0027] The beneficial effects of the present invention are:

[0028] The present invention realizes better extrusion distribution effect by changing the inner diameter through the variable diameter pipe structure provided, and injects the agent into the sludge by setting a suitable agent outlet, so that the sludge and the agent can be mixed as efficiently as possible under the state of non-powered stirring, and after the agent is fully mixed with the sludge, the expansion of the sludge during the transmission process can be effectively suppressed, thereby avoiding damage to the equipment and secondary pollution to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic plan view of the entire pipeline mixer of the second embodiment of the present invention;

[0030] Figure 2 This is an axial schematic diagram of the entire pipeline mixer of Example 2 of the present invention;

[0031] Figure 3 It is a schematic plan view of the side opening of the entire pipeline mixer in the second embodiment of the present invention;

[0032] Figure 4 It is an axial side schematic diagram of the entire pipeline mixer in the horizontal state of the second embodiment of the present invention;

[0033] Figure 5 The present invention Figure 4 A is a local enlarged schematic diagram;

[0034] Figure 6 It is a schematic diagram of the planar structure of a single extrusion expansion portion in the first embodiment of the present invention;

[0035] Figure 7 The present invention Figure 6 The schematic diagram of the cross section after cutting along the AA cutting line;

[0036] Figure 8 It is an axial schematic diagram of a single extrusion expansion portion in Example 1 of the present invention.

[0037] In the figure: 1-extrusion expansion part, 2-connecting part, 3-reinforcement edge strip, 4-drug distributor, 5-drug adding tube, 6-knife head, 7-drug outlet, 8-drug dispensing cavity. DETAILED DESCRIPTION

[0038] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0042] In the description of this application, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, if the terms "first", "second", etc. appear in the description of this application, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0043] In addition, if the terms "horizontal" or "vertical" appear in the description of this application, it does not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0044] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] Embodiment 1:

[0046] This embodiment discloses a 5-channel mixer with a dosing pipe for sludge drying treatment, which is a mixing device for a reagent and sludge used in the sludge drying process. The sludge drying process is a treatment process that reduces the moisture content of the sludge through different equipment. First, after dehydration, the moisture content of the sludge can be reduced to less than 50%, depending on the properties of the sludge and sediment and the efficiency of the dehydration equipment. Further dehydration of the sludge is called sludge drying, and the moisture content of the dried sludge is less than 10%. The main methods of dehydration are natural drying, mechanical dehydration and granulation. Natural drying and mechanical dehydration are suitable for sewage sludge, and granulation is suitable for coagulated and precipitated sludge.

[0047] Since the sludge drying plant receives sludge with different moisture contents transported by multiple local institutions, it is usually processed separately through multiple steps. The sludge with high moisture content is first mechanically or naturally dehydrated, and after its moisture content drops to an appropriate value, it is sent to the steam drying treatment equipment together with the sludge with the same moisture content range for further treatment. During this treatment process, the sludge needs to be continuously transported and stored, and the sludge with high moisture content will expand rapidly under appropriate temperature conditions. The screw conveying equipment usually used is a sealed structure, so during the treatment, the sludge expansion often squeezes the transmission equipment, causing equipment damage and sludge leakage.

[0048] In order to avoid the above situation, it is necessary to delay the rate of sludge expansion so that its expansion rate during transportation is lower than the safety threshold. The existing practice is to add suitable mixed agents to the sludge, including stabilizers such as iron salts and polyacrylamide. The above agents are all aqueous solutions when added, and can be mixed with the sludge through stirring equipment. The pipeline mixer provided in this embodiment does not require the addition of an additional power source, but only needs to be powered by a sludge pump installed in front of the original equipment. The pipe body structure in the present invention is different from the existing rotary vane structure, has a smaller blocking effect, and is suitable for sludge with higher viscosity.

[0049] Specifically, it includes at least two connecting parts 2 that are interconnected and form a continuous channel inside, and an extrusion expansion part 1 arranged between adjacent connecting parts 2. The channel cross section of the extrusion expansion part 1 determines two mutually perpendicular axes with a center point, starting from the channel cross section where the opening on one side of the extrusion expansion part 1 is located, one axis length is first extended and then shortened, and the other axis length is first shortened and then extended; and the channel cross-sectional area difference of the entire extrusion expansion part 1 is less than 20%. That is to say, the pipeline in the present invention includes two connecting pipes and an extrusion expansion part 1 arranged in the middle of the connecting pipes, and the so-called extrusion expansion part 1 is formed by changing the inner diameter to form a continuous and smooth guide pipe, the sludge is extruded and expanded through the guide pipe with a variable diameter, and a drug outlet 7 is set at the cross section with the maximum length and the minimum width to introduce the mixed agent into the sludge, so as to achieve a better mixing effect.

[0050] Since the sludge is acted on by squeezing the inner wall, the head loss is smaller than that caused by stirring or rotating blades. At the same time, in order to further reduce the kinetic energy loss, the difference in cross-sectional area change is limited to no more than 20%. In the prior art, there is a pipeline mixer with multiple expansion chambers for treating sludge. This pipeline structure with multiple expansion chambers is obviously not conducive to the mixing of the reagents due to the enlarged pipe diameter. If an active stirring mechanism is added separately, its cost will increase, and the stirring direction and stirring time will cause mutual constraints on the flow rate and the distribution of the reagents. Reducing the pipe diameter can reduce the area of ​​​​drug distribution, thereby improving the uniformity of the distribution of the reagent, but it will affect its flow rate. Only by controlling the cross-sectional area and reducing the rate of change of the cross-sectional area can the flow rate loss be effectively reduced (based on the present invention, the extrusion effect of the sludge is achieved through the smooth change of the inner wall. If other guiding or cutting structures are directly set in the pipeline, such as other similar rotating blades, it may not have the same effect).

[0051] Embodiment 2:

[0052] This embodiment is optimized and limited based on the embodiment 1, wherein, Figure 1-8As shown, the middle part of the entire tube body includes three interconnected extrusion expansion parts 1, and the relative deflection angle between adjacent extrusion expansion parts 1 is 60 degrees. A drug outlet 7 is provided in the extrusion expansion part 1, and the drug outlet 7 is arranged at the length change turning point in the middle of the two axes.

[0053] exist Figure 6 It can be seen that the section line AA is the so-called turning point of length change. From the outside, it can be seen that the extrusion expansion part 1 first widens on both sides and then gradually narrows, and the widest part in the middle is also the narrowest part perpendicular to the viewing direction of the figure. Specifically, the turning point of length change refers to the turning point where the axis first becomes longer and then shortens. This is the minimum width position mentioned in the above content. At this time, the sludge has a larger length and a smaller width when passing through this section, and the amount of sludge per unit length is the smallest. By setting multiple drug outlets 7 along the length direction here, uniform distribution can be achieved under a smaller drug injection water pressure state, and there is no need to turn the sludge.

[0054] In this embodiment, in order to achieve a better dosing and mixing effect, a drug distributor 4 is provided on the outside of the extrusion expansion portion 1. As can be seen from the figure, the drug distributor 4 is a strip structure, which is arranged along the length direction at the minimum cross-sectional width and is connected to the external drug adding equipment through the drug adding pipe 5.

[0055] At the same time, in order to increase the structural strength of the entire extrusion expansion section 1, a reinforcing edge strip 3 is provided at the outward protruding edge of the extrusion expansion section 1. The so-called outward protruding edge means that due to the structural design of "flattening" the entire pipeline, the two ends of one of the axes will expand outward and exceed the original cross-sectional diameter, and the outer side of the entire extrusion expansion section 1 will form an outward protruding arc edge. Since the sludge is then subjected to the inner wall extrusion force in the direction perpendicular to the axis, it has an extrusion force toward both sides. In order to increase the structural strength, a metal reinforcing edging structure is provided on the protruding arcs on both sides. In this embodiment, the reinforcing edge strip 3 is a metal material that covers and presses the two arc edges and is fixed by bolts.

[0056] A slot along the axial direction is provided in the extrusion expansion part 1 at the length change turning point in the middle of the two shafts, and a cutter head 6 along the axial direction is formed by at least two slots.

[0057] It is worth noting that, when observing from the opening on one side of the extrusion expansion part 1, it can be seen that the inner walls on both sides in the same axial direction will produce inward extrusion deformation, resulting in a reduction in the cross-sectional width. A ridge will be formed at the place with the lowest width, and the two sides of the ridge are smoothly transitioned curved surfaces, and the sludge will form the smallest cross-sectional width at this place. At this time, by arranging multiple blade heads 6 structures on the ridge, a tangential force on the sludge can be formed, so that the sludge passing through the blade heads 6 is divided, and the stirring effect of the sludge is effectively increased.

[0058] exist Figure 5 It can be seen from the enlarged view that the drug outlet 7 is arranged on both sides of the cutter head 6 and at the tail of the cutter head 6. When the sludge passes through the narrowest part of the cutter head 6 after being squeezed, it will be cut by the edges of multiple cutter heads 6. At this time, adding liquid medicine into the cutting gap can make the medicine distributed in deeper sludge, thereby preventing the problem of internal sludge expansion caused by surface or local addition of medicine in the prior art. The drug dispensing device 4 has a drug dispensing cavity 8, which has an end extending to the inside of the cutter head 6, and the end is connected to the drug outlet 7.

[0059] Furthermore, the structure of the cutter head 6 in this embodiment is a structure that is narrow in front and wide in the back formed by slotting the inner wall of the extruded pile expansion part 1 along the sludge flow direction. It can be seen from the figure that a tooth structure is formed at the narrowest part of the tube. In order to achieve a better cutting effect, the cutter head 6 can be raised. However, due to the large resistance of the sludge, if a longer cutter head 6 is used, the resistance may be further increased. The cutter head 6 in this embodiment is mainly used to divide the sludge before injecting the agent when adding the agent, which can improve the diffusion efficiency of the agent.

[0060] It is also worth noting that this embodiment illustrates the actual use of the structure by combining the accompanying drawings. Generally, the structure is in a horizontal state and is set on the ground by a fixed frame. The structure shown in the figure is only for illustration. The actual structure will show a more exaggerated expansion width due to the limiting conditions of the cross-sectional area change value. The pipeline mixer is the same as the prior art in that both sides of the port are connected to the external pipeline with a flange structure, and in order to further reduce the kinetic energy loss, the inner wall will be coated with an anti-corrosion and anti-sticking material, which is generally a polymer material such as polytetrafluoroethylene.

[0061] At the same time, in this embodiment, only three extrusion expansion parts 1 with a deflection angle of 60° (or 120°, different relative values ​​of the deflection angles will be obtained according to different reference axes, but they are essentially the same) are used to form a single multi-directional extrusion. Two groups of six extrusion expansion parts 1 can also be connected according to needs to achieve a better dosing and mixing effect.

[0062] The present invention is not limited to the above optional implementations, and anyone can derive other various forms of products under the enlightenment of the present invention. The above specific implementations should not be understood as limiting the scope of protection of the present invention. The scope of protection of the present invention should be based on the definition in the claims, and the description can be used to interpret the claims.

Claims

1. A dosing pipeline mixer for sludge drying treatment, arranged on a sludge conveying pipeline in a sludge drying treatment process, characterized in that: It comprises at least two connecting parts (2) which are connected to each other and form a continuous channel inside, and an extrusion expansion part (1) arranged between adjacent connecting parts (2); The channel cross section of the extrusion expansion part (1) defines two mutually perpendicular axes with a center point, starting from the channel cross section where the opening on one side of the extrusion expansion part (1) is located, the length of one axis is first extended and then shortened, and the length of the other axis is first shortened and then extended; The difference in the channel cross-sectional area of ​​the entire extrusion expansion portion (1) is less than 20%; The extrusion expansion portion (1) is provided with a medicine outlet (7), and the medicine outlet (7) is arranged at a length change turning point in the middle of the two shafts; A drug distributor (4) is provided on the outside of the extrusion expansion portion (1), the drug distributor (4) being arranged along the length direction at the minimum cross-sectional width and being connected to an external drug adding device via a drug adding pipe (5); It comprises at least two mutually connected extrusion expansion parts (1), and the relative deflection angle between adjacent extrusion expansion parts (1) is 60° or 90°.

2. The dosing pipeline mixer for sludge drying treatment according to claim 1 is characterized by: A reinforcing edge strip (3) is provided at the outwardly protruding edge of the extruded expansion portion (1).

3. The dosing pipeline mixer for sludge drying treatment according to claim 2, characterized in that: The extrusion expansion portion (1) is provided with a slot along the axial direction at a length change turning point in the middle of the two shafts, and a cutter head (6) along the axial direction is formed by at least two slots.

4. The dosing pipeline mixer for sludge drying treatment according to claim 3 is characterized by: The medicine outlet (7) is arranged on both sides of the cutter head (6).

5. The dosing pipeline mixer for sludge drying treatment according to claim 4, characterized in that: The medicine dispensing device (4) has a medicine dispensing cavity (8) therein, and the medicine dispensing cavity (8) has an end portion extending to the interior of the cutter head (6), and the end portion is in communication with the medicine outlet (7).

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